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gstreamer/subprojects/gst-plugins-good/ext/adaptivedemux2/hls/m3u8.c
Jan Schmidt ef0e822559 hlsng: Check caps are not null after parsing HLS CODECS tag 
If the mime codec wasn't recognised, caps will be NULL and cause
a critical

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/6969>
2024-07-30 00:06:50 +00:00

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/* GStreamer
* Copyright (C) 2010 Marc-Andre Lureau <marcandre.lureau@gmail.com>
* Copyright (C) 2015 Tim-Philipp Müller <tim@centricular.com>
*
* Copyright (C) 2021-2022 Centricular Ltd
* Author: Edward Hervey <edward@centricular.com>
* Author: Jan Schmidt <jan@centricular.com>
*
* m3u8.c:
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include <stdlib.h>
#include <math.h>
#include <errno.h>
#include <glib.h>
#include <gmodule.h>
#include <string.h>
#include <gst/pbutils/pbutils.h>
#include "m3u8.h"
#include "gstadaptivedemux.h"
#include "gsthlselements.h"
#define GST_CAT_DEFAULT hls2_debug
static gchar *uri_join (const gchar * uri, const gchar * path);
static void
gst_m3u8_media_segment_fill_partial_stream_times (GstM3U8MediaSegment *
segment);
GstHLSMediaPlaylist *
gst_hls_media_playlist_ref (GstHLSMediaPlaylist * m3u8)
{
g_assert (m3u8 != NULL && m3u8->ref_count > 0);
g_atomic_int_add (&m3u8->ref_count, 1);
return m3u8;
}
void
gst_hls_media_playlist_unref (GstHLSMediaPlaylist * self)
{
g_return_if_fail (self != NULL && self->ref_count > 0);
if (g_atomic_int_dec_and_test (&self->ref_count)) {
g_free (self->uri);
g_free (self->base_uri);
g_ptr_array_free (self->segments, TRUE);
if (self->preload_hints != NULL)
g_ptr_array_free (self->preload_hints, TRUE);
if (self->removed_date_ranges != NULL)
g_strfreev (self->removed_date_ranges);
g_free (self->last_data);
g_mutex_clear (&self->lock);
g_free (self);
}
}
static GstM3U8MediaSegment *
gst_m3u8_media_segment_new (gchar * uri, gchar * title, GstClockTime duration,
gint64 sequence, gint64 discont_sequence, gint64 size, gint64 offset)
{
GstM3U8MediaSegment *file;
file = g_new0 (GstM3U8MediaSegment, 1);
file->uri = uri;
file->title = title;
file->duration = duration;
file->sequence = sequence;
file->discont_sequence = discont_sequence;
file->ref_count = 1;
file->stream_time = GST_CLOCK_STIME_NONE;
file->size = size;
if (size != -1 && offset != -1) {
file->offset = offset;
}
return file;
}
GstM3U8MediaSegment *
gst_m3u8_media_segment_ref (GstM3U8MediaSegment * mfile)
{
g_assert (mfile != NULL && mfile->ref_count > 0);
g_atomic_int_add (&mfile->ref_count, 1);
return mfile;
}
void
gst_m3u8_media_segment_unref (GstM3U8MediaSegment * self)
{
g_return_if_fail (self != NULL && self->ref_count > 0);
if (g_atomic_int_dec_and_test (&self->ref_count)) {
if (self->init_file)
gst_m3u8_init_file_unref (self->init_file);
g_free (self->title);
g_free (self->uri);
g_free (self->key);
if (self->datetime)
g_date_time_unref (self->datetime);
if (self->partial_segments)
g_ptr_array_free (self->partial_segments, TRUE);
g_free (self);
}
}
GstM3U8PartialSegment *
gst_m3u8_partial_segment_ref (GstM3U8PartialSegment * part)
{
g_assert (part != NULL && part->ref_count > 0);
g_atomic_int_add (&part->ref_count, 1);
return part;
}
void
gst_m3u8_partial_segment_unref (GstM3U8PartialSegment * part)
{
g_return_if_fail (part != NULL && part->ref_count > 0);
if (g_atomic_int_dec_and_test (&part->ref_count)) {
g_free (part->uri);
g_free (part);
}
}
GstM3U8PreloadHint *
gst_m3u8_preload_hint_ref (GstM3U8PreloadHint * hint)
{
g_assert (hint != NULL && hint->ref_count > 0);
g_atomic_int_add (&hint->ref_count, 1);
return hint;
}
void
gst_m3u8_preload_hint_unref (GstM3U8PreloadHint * hint)
{
g_return_if_fail (hint != NULL && hint->ref_count > 0);
if (g_atomic_int_dec_and_test (&hint->ref_count)) {
g_free (hint->uri);
g_free (hint);
}
}
gboolean
gst_m3u8_preload_hint_equal (GstM3U8PreloadHint * hint1,
GstM3U8PreloadHint * hint2)
{
if (hint1->hint_type != hint2->hint_type)
return FALSE;
if (g_strcmp0 (hint1->uri, hint2->uri))
return FALSE;
if (hint1->offset != hint2->offset)
return FALSE;
if (hint1->size != hint2->size)
return FALSE;
return TRUE;
}
static GstM3U8InitFile *
gst_m3u8_init_file_new (gchar * uri, gint64 size, gint64 offset)
{
GstM3U8InitFile *file;
file = g_new0 (GstM3U8InitFile, 1);
file->uri = uri;
file->ref_count = 1;
file->size = size;
if (size != -1 && offset != -1) {
file->offset = offset;
}
return file;
}
GstM3U8InitFile *
gst_m3u8_init_file_ref (GstM3U8InitFile * ifile)
{
g_assert (ifile != NULL && ifile->ref_count > 0);
g_atomic_int_add (&ifile->ref_count, 1);
return ifile;
}
void
gst_m3u8_init_file_unref (GstM3U8InitFile * self)
{
g_return_if_fail (self != NULL && self->ref_count > 0);
if (g_atomic_int_dec_and_test (&self->ref_count)) {
g_free (self->uri);
g_free (self);
}
}
gboolean
gst_m3u8_init_file_equal (const GstM3U8InitFile * ifile1,
const GstM3U8InitFile * ifile2)
{
if (ifile1 == ifile2)
return TRUE;
if (ifile1 == NULL && ifile2 != NULL)
return FALSE;
if (ifile1 != NULL && ifile2 == NULL)
return FALSE;
if (g_strcmp0 (ifile1->uri, ifile2->uri))
return FALSE;
if (ifile1->offset != ifile2->offset)
return FALSE;
if (ifile1->size != ifile2->size)
return FALSE;
return TRUE;
}
static gboolean
int_from_string (gchar * ptr, gchar ** endptr, gint * val)
{
gchar *end;
gint64 ret;
g_return_val_if_fail (ptr != NULL, FALSE);
g_return_val_if_fail (val != NULL, FALSE);
errno = 0;
ret = g_ascii_strtoll (ptr, &end, 10);
if ((errno == ERANGE && (ret == G_MAXINT64 || ret == G_MININT64))
|| (errno != 0 && ret == 0)) {
GST_WARNING ("%s", g_strerror (errno));
return FALSE;
}
if (ret > G_MAXINT || ret < G_MININT) {
GST_WARNING ("%s", g_strerror (ERANGE));
return FALSE;
}
if (endptr)
*endptr = end;
*val = (gint) ret;
return end != ptr;
}
static gboolean
int64_from_string (gchar * ptr, gchar ** endptr, gint64 * val)
{
gchar *end;
gint64 ret;
g_return_val_if_fail (ptr != NULL, FALSE);
g_return_val_if_fail (val != NULL, FALSE);
errno = 0;
ret = g_ascii_strtoll (ptr, &end, 10);
if ((errno == ERANGE && (ret == G_MAXINT64 || ret == G_MININT64))
|| (errno != 0 && ret == 0)) {
GST_WARNING ("%s", g_strerror (errno));
return FALSE;
}
if (endptr)
*endptr = end;
*val = ret;
return end != ptr;
}
static gboolean
double_from_string (gchar * ptr, gchar ** endptr, gdouble * val)
{
gchar *end;
gdouble ret;
g_return_val_if_fail (ptr != NULL, FALSE);
g_return_val_if_fail (val != NULL, FALSE);
errno = 0;
ret = g_ascii_strtod (ptr, &end);
if ((errno == ERANGE && (ret == HUGE_VAL || ret == -HUGE_VAL))
|| (errno != 0 && ret == 0)) {
GST_WARNING ("%s", g_strerror (errno));
return FALSE;
}
if (!isfinite (ret)) {
GST_WARNING ("%s", g_strerror (ERANGE));
return FALSE;
}
if (endptr)
*endptr = end;
*val = (gdouble) ret;
return end != ptr;
}
static gboolean
time_from_double_in_string (gchar * ptr, gchar ** endptr, GstClockTime * val)
{
double fval;
if (!double_from_string (ptr, endptr, &fval)) {
return FALSE;
}
*val = fval * (gdouble) GST_SECOND;
return TRUE;
}
static gboolean
parse_attributes (gchar ** ptr, gchar ** a, gchar ** v)
{
gchar *end = NULL, *p, *ve;
g_return_val_if_fail (ptr != NULL, FALSE);
g_return_val_if_fail (*ptr != NULL, FALSE);
g_return_val_if_fail (a != NULL, FALSE);
g_return_val_if_fail (v != NULL, FALSE);
/* [attribute=value,]* */
*a = *ptr;
end = p = g_utf8_strchr (*ptr, -1, ',');
if (end) {
gchar *q = g_utf8_strchr (*ptr, -1, '"');
if (q && q < end) {
/* special case, such as CODECS="avc1.77.30, mp4a.40.2" */
q = g_utf8_next_char (q);
if (q) {
q = g_utf8_strchr (q, -1, '"');
}
if (q) {
end = p = g_utf8_strchr (q, -1, ',');
}
}
}
if (end) {
do {
end = g_utf8_next_char (end);
} while (end && *end == ' ');
*p = '\0';
}
*v = p = g_utf8_strchr (*ptr, -1, '=');
if (*v) {
*p = '\0';
*v = g_utf8_next_char (*v);
if (**v == '"') {
ve = g_utf8_next_char (*v);
if (ve) {
ve = g_utf8_strchr (ve, -1, '"');
}
if (ve) {
*v = g_utf8_next_char (*v);
*ve = '\0';
} else {
GST_WARNING ("Cannot remove quotation marks from %s", *a);
}
}
} else {
GST_WARNING ("missing = after attribute");
return FALSE;
}
*ptr = end;
return TRUE;
}
GstHLSMediaPlaylist *
gst_hls_media_playlist_new (const gchar * uri, const gchar * base_uri)
{
GstHLSMediaPlaylist *m3u8;
m3u8 = g_new0 (GstHLSMediaPlaylist, 1);
m3u8->playlist_ts = GST_CLOCK_TIME_NONE;
m3u8->uri = g_strdup (uri);
m3u8->base_uri = g_strdup (base_uri);
m3u8->request_time = GST_CLOCK_TIME_NONE;
m3u8->version = 1;
m3u8->type = GST_HLS_PLAYLIST_TYPE_UNDEFINED;
m3u8->targetduration = GST_CLOCK_TIME_NONE;
m3u8->partial_targetduration = GST_CLOCK_TIME_NONE;
m3u8->media_sequence = 0;
m3u8->discont_sequence = -1;
m3u8->endlist = FALSE;
m3u8->i_frame = FALSE;
m3u8->allowcache = TRUE;
m3u8->ext_x_key_present = FALSE;
m3u8->ext_x_pdt_present = FALSE;
m3u8->segments =
g_ptr_array_new_full (16, (GDestroyNotify) gst_m3u8_media_segment_unref);
m3u8->duration = 0;
m3u8->skip_boundary = GST_CLOCK_TIME_NONE;
m3u8->hold_back = GST_CLOCK_TIME_NONE;
m3u8->part_hold_back = GST_CLOCK_TIME_NONE;
g_mutex_init (&m3u8->lock);
m3u8->ref_count = 1;
return m3u8;
}
void
gst_hls_media_playlist_dump (GstHLSMediaPlaylist * self)
{
#ifndef GST_DISABLE_GST_DEBUG
guint idx;
gchar *datestring;
GST_DEBUG ("uri : %s", self->uri);
GST_DEBUG ("base_uri : %s", self->base_uri);
GST_DEBUG ("version : %d", self->version);
GST_DEBUG ("targetduration : %" GST_TIME_FORMAT,
GST_TIME_ARGS (self->targetduration));
GST_DEBUG ("partial segment targetduration : %" GST_TIME_FORMAT,
GST_TIME_ARGS (self->partial_targetduration));
GST_DEBUG ("media_sequence : %" G_GINT64_FORMAT, self->media_sequence);
GST_DEBUG ("discont_sequence : %" G_GINT64_FORMAT, self->discont_sequence);
GST_DEBUG ("endlist : %s",
self->endlist ? "present" : "NOT present");
GST_DEBUG ("i_frame : %s", self->i_frame ? "YES" : "NO");
GST_DEBUG ("EXT-X-KEY : %s",
self->ext_x_key_present ? "present" : "NOT present");
GST_DEBUG ("EXT-X-PROGRAM-DATE-TIME : %s",
self->ext_x_pdt_present ? "present" : "NOT present");
GST_DEBUG ("duration : %" GST_TIME_FORMAT,
GST_TIME_ARGS (self->duration));
GST_DEBUG ("skip boundary : %" GST_TIME_FORMAT,
GST_TIME_ARGS (self->skip_boundary));
GST_DEBUG ("skip dateranges : %s", self->can_skip_dateranges ? "YES" : "NO");
GST_DEBUG ("hold back : %" GST_TIME_FORMAT,
GST_TIME_ARGS (self->hold_back));
GST_DEBUG ("part hold back : %" GST_TIME_FORMAT,
GST_TIME_ARGS (self->part_hold_back));
GST_DEBUG ("can block reloads: %s", self->can_block_reload ? "YES" : "NO");
GST_DEBUG ("skipped segments: %d", self->skipped_segments);
if (self->num_removed_date_ranges && self->removed_date_ranges) {
GST_DEBUG ("Removed date ranges: %u", self->num_removed_date_ranges);
gchar **cur = self->removed_date_ranges;
while (*cur != NULL) {
GST_DEBUG (" ID: %s", *cur);
cur++;
}
}
GST_DEBUG ("Segments : %d", self->segments->len);
for (idx = 0; idx < self->segments->len; idx++) {
GstM3U8MediaSegment *segment = g_ptr_array_index (self->segments, idx);
GST_DEBUG (" sequence:%" G_GINT64_FORMAT " discont_sequence:%"
G_GINT64_FORMAT, segment->sequence, segment->discont_sequence);
GST_DEBUG (" partial only: %s", segment->partial_only ? "YES" : "NO");
GST_DEBUG (" stream_time : %" GST_STIME_FORMAT,
GST_STIME_ARGS (segment->stream_time));
GST_DEBUG (" duration : %" GST_TIME_FORMAT,
GST_TIME_ARGS (segment->duration));
if (segment->title)
GST_DEBUG (" title : %s", segment->title);
GST_DEBUG (" discont : %s", segment->discont ? "YES" : "NO");
if (segment->datetime) {
datestring = g_date_time_format_iso8601 (segment->datetime);
GST_DEBUG (" date/time : %s", datestring);
g_free (datestring);
}
if (segment->init_file) {
GST_DEBUG (" init file : %s %" G_GUINT64_FORMAT " %" G_GINT64_FORMAT,
segment->init_file->uri, segment->init_file->offset,
segment->init_file->size);
}
GST_DEBUG (" uri : %s %" G_GUINT64_FORMAT " %" G_GINT64_FORMAT,
segment->uri, segment->offset, segment->size);
GST_DEBUG (" is gap : %s", segment->is_gap ? "YES" : "NO");
if (segment->partial_segments != NULL) {
guint part_idx;
for (part_idx = 0; part_idx < segment->partial_segments->len; part_idx++) {
GstM3U8PartialSegment *part =
g_ptr_array_index (segment->partial_segments, part_idx);
GST_DEBUG (" partial segment %u:", part_idx);
GST_DEBUG (" uri : %s %" G_GUINT64_FORMAT " %"
G_GINT64_FORMAT, part->uri, part->offset, part->size);
GST_DEBUG (" stream_time : %" GST_STIME_FORMAT,
GST_STIME_ARGS (part->stream_time));
GST_DEBUG (" duration : %" GST_TIME_FORMAT,
GST_TIME_ARGS (part->duration));
GST_DEBUG (" is gap : %s", part->is_gap ? "YES" : "NO");
GST_DEBUG (" independent : %s", part->independent ? "YES" : "NO");
}
}
}
if (self->preload_hints) {
GST_DEBUG ("Preload Hints: %d", self->preload_hints->len);
for (idx = 0; idx < self->preload_hints->len; idx++) {
GstM3U8PreloadHint *hint = g_ptr_array_index (self->preload_hints, idx);
const gchar *hint_type_str;
switch (hint->hint_type) {
case M3U8_PRELOAD_HINT_MAP:
hint_type_str = "MAP";
break;
case M3U8_PRELOAD_HINT_PART:
hint_type_str = "PART";
break;
default:
g_assert_not_reached ();
}
GST_DEBUG (" preload hint %u: type %s", idx, hint_type_str);
GST_DEBUG (" uri : %s %" G_GUINT64_FORMAT " %"
G_GINT64_FORMAT, hint->uri, hint->offset, hint->size);
}
}
#endif
}
static void
gst_hls_media_playlist_postprocess_pdt (GstHLSMediaPlaylist * self)
{
gint idx, len = self->segments->len;
gint first_pdt = -1;
GstM3U8MediaSegment *previous = NULL;
GstM3U8MediaSegment *segment = NULL;
/* Iterate forward, and make sure datetimes are coherent */
for (idx = 0; idx < len; idx++, previous = segment) {
segment = g_ptr_array_index (self->segments, idx);
#define ABSDIFF(a,b) ((a) > (b) ? (a) - (b) : (b) - (a))
if (segment->datetime) {
if (first_pdt == -1)
first_pdt = idx;
if (!segment->discont && previous && previous->datetime) {
GstClockTimeDiff diff = g_date_time_difference (segment->datetime,
previous->datetime) * GST_USECOND;
if (ABSDIFF (diff, previous->duration) > 500 * GST_MSECOND) {
GST_LOG ("PDT diff %" GST_STIME_FORMAT " previous duration %"
GST_TIME_FORMAT, GST_STIME_ARGS (diff),
GST_TIME_ARGS (previous->duration));
g_date_time_unref (segment->datetime);
segment->datetime =
g_date_time_add (previous->datetime,
previous->duration / GST_USECOND);
}
}
} else {
if (segment->discont) {
GST_WARNING ("Discont segment doesn't have a PDT !");
} else if (previous) {
if (previous->datetime) {
segment->datetime =
g_date_time_add (previous->datetime,
previous->duration / GST_USECOND);
GST_LOG
("Generated new PDT based on previous segment PDT and duration");
} else {
GST_LOG ("Missing PDT, but can't generate it from previous one");
}
}
}
}
if (first_pdt != -1 && first_pdt != 0) {
GST_LOG ("Scanning backwards from %d", first_pdt);
previous = g_ptr_array_index (self->segments, first_pdt);
for (idx = first_pdt - 1; idx >= 0; idx = idx - 1) {
GST_LOG ("%d", idx);
segment = g_ptr_array_index (self->segments, idx);
if (!segment->datetime && previous->datetime) {
segment->datetime =
g_date_time_add (previous->datetime,
-(segment->duration / GST_USECOND));
}
previous = segment;
}
}
}
static GstM3U8PartialSegment *
gst_m3u8_parse_partial_segment (gchar * data, const gchar * base_uri)
{
gchar *v, *a;
gboolean have_duration = FALSE;
GstM3U8PartialSegment *part = g_new0 (GstM3U8PartialSegment, 1);
part->ref_count = 1;
part->stream_time = GST_CLOCK_STIME_NONE;
part->size = -1;
while (data != NULL && parse_attributes (&data, &a, &v)) {
if (strcmp (a, "URI") == 0) {
g_free (part->uri);
part->uri = uri_join (base_uri, v);
} else if (strcmp (a, "DURATION") == 0) {
if (!time_from_double_in_string (v, NULL, &part->duration)) {
GST_WARNING ("Can't read EXT-X-PART duration");
goto malformed_line;
}
have_duration = TRUE;
} else if (strcmp (a, "INDEPENDENT") == 0) {
part->independent = g_ascii_strcasecmp (v, "yes") == 0;
} else if (strcmp (a, "GAP") == 0) {
part->is_gap = g_ascii_strcasecmp (v, "yes") == 0;
} else if (strcmp (a, "BYTERANGE") == 0) {
if (int64_from_string (v, &v, &part->size)) {
goto malformed_line;
}
if (*v == '@' && !int64_from_string (v + 1, &v, &part->offset)) {
goto malformed_line;
}
}
}
if (part->uri == NULL || !have_duration) {
goto required_attributes_missing;
}
return part;
required_attributes_missing:
{
GST_WARNING
("EXT-X-PART description is missing required URI or DURATION attributes");
gst_m3u8_partial_segment_unref (part);
return NULL;
}
malformed_line:
{
GST_WARNING ("Invalid EXT-X-PART entry in playlist");
gst_m3u8_partial_segment_unref (part);
return NULL;
}
}
static GstM3U8PreloadHint *
gst_m3u8_parse_preload_hint (gchar * data, const gchar * base_uri)
{
gchar *v, *a;
GstM3U8PreloadHint *hint = g_new0 (GstM3U8PreloadHint, 1);
gboolean have_hint_type = FALSE;
hint->ref_count = 1;
hint->size = -1;
while (data != NULL && parse_attributes (&data, &a, &v)) {
if (strcmp (a, "TYPE") == 0) {
if (g_ascii_strcasecmp (v, "MAP") == 0) {
hint->hint_type = M3U8_PRELOAD_HINT_MAP;
} else if (g_ascii_strcasecmp (v, "PART") == 0) {
hint->hint_type = M3U8_PRELOAD_HINT_PART;
} else {
GST_WARNING ("Unknown Preload Hint type %s", v);
goto malformed_line;
}
have_hint_type = TRUE;
} else if (strcmp (a, "URI") == 0) {
g_free (hint->uri);
hint->uri = uri_join (base_uri, v);
} else if (strcmp (a, "BYTERANGE-START") == 0) {
if (int64_from_string (v, NULL, &hint->offset)) {
goto malformed_line;
}
} else if (strcmp (a, "BYTERANGE-LENGTH") == 0) {
if (int64_from_string (v, NULL, &hint->size)) {
goto malformed_line;
}
}
}
if (hint->uri == NULL || !have_hint_type) {
goto required_attributes_missing;
}
return hint;
required_attributes_missing:
{
GST_WARNING
("EXT-X-PRELOAD-HINT is missing required URI or TYPE attributes");
gst_m3u8_preload_hint_unref (hint);
return NULL;
}
malformed_line:
{
GST_WARNING ("Invalid EXT-X-PRELOAD-HINT entry in playlist");
gst_m3u8_preload_hint_unref (hint);
return NULL;
}
}
static void
parse_server_control (GstHLSMediaPlaylist * self, gchar * data)
{
gchar *v, *a;
while (data != NULL && parse_attributes (&data, &a, &v)) {
if (strcmp (a, "CAN-SKIP-UNTIL") == 0) {
if (!time_from_double_in_string (v, NULL, &self->skip_boundary)) {
GST_WARNING ("Can't read Skip Boundary value");
goto malformed_line;
}
} else if (strcmp (a, "CAN-SKIP-DATERANGES") == 0) {
self->can_skip_dateranges = g_ascii_strcasecmp (v, "YES") == 0;
} else if (strcmp (a, "HOLD-BACK") == 0) {
if (!time_from_double_in_string (v, NULL, &self->hold_back)) {
GST_WARNING ("Can't read Hold-Back value");
goto malformed_line;
}
} else if (strcmp (a, "PART-HOLD-BACK") == 0) {
if (!time_from_double_in_string (v, NULL, &self->part_hold_back)) {
GST_WARNING ("Can't read Part-Hold-Back value");
goto malformed_line;
}
} else if (strcmp (a, "CAN-BLOCK-RELOAD") == 0) {
self->can_block_reload = g_ascii_strcasecmp (v, "YES") == 0;
}
}
return;
malformed_line:
{
GST_WARNING ("Invalid EXT-X-SERVER-CONTROL entry in playlist");
return;
}
}
/* Parse EXT-X-SKIP */
static void
parse_skip_tag (GstHLSMediaPlaylist * self, gchar * data)
{
gchar *v, *a;
while (data != NULL && parse_attributes (&data, &a, &v)) {
if (strcmp (a, "SKIPPED-SEGMENTS") == 0) {
if (!int_from_string (v, NULL, &self->skipped_segments)
|| self->skipped_segments < 0) {
GST_WARNING ("Can't read skipped segments from EXT-X-SKIP value");
self->skipped_segments = 0;
goto malformed_line;
}
} else if (strcmp (a, "RECENTLY-REMOVED-DATERANGES") == 0) {
gchar **removed_date_ranges = g_strsplit (v, "\t", -1);
g_strfreev (self->removed_date_ranges);
self->removed_date_ranges = removed_date_ranges;
self->num_removed_date_ranges = g_strv_length (removed_date_ranges);
}
}
return;
malformed_line:
{
GST_WARNING ("Invalid EXT-X-SKIP entry in playlist");
return;
}
}
/* Parse and create a new GstHLSMediaPlaylist */
GstHLSMediaPlaylist *
gst_hls_media_playlist_parse (gchar * data,
GstClockTime playlist_ts, const gchar * uri, const gchar * base_uri)
{
gchar *input_data = data;
GstHLSMediaPlaylist *self;
gint val;
GstClockTime duration, partial_duration;
gchar *title, *end;
gboolean discontinuity = FALSE;
gchar *current_key = NULL;
gboolean have_iv = FALSE;
guint8 iv[16] = { 0, };
gint64 size = -1, offset = -1;
gint64 mediasequence = 0;
gint64 dsn = 0;
GDateTime *date_time = NULL;
GstM3U8InitFile *last_init_file = NULL;
GstM3U8MediaSegment *previous = NULL;
GPtrArray *partial_segments = NULL;
gboolean is_gap = FALSE;
GST_LOG ("playlist ts: %" GST_TIMEP_FORMAT, &playlist_ts);
GST_LOG ("uri: %s", uri);
GST_LOG ("base_uri: %s", base_uri);
GST_TRACE ("data:\n%s", data);
if (!g_str_has_prefix (data, "#EXTM3U")) {
GST_WARNING ("Data doesn't start with #EXTM3U");
g_free (data);
return NULL;
}
if (g_strrstr (data, "\n#EXT-X-STREAM-INF:") != NULL) {
GST_WARNING ("Not a media playlist, but a master playlist!");
g_free (data);
return NULL;
}
self = gst_hls_media_playlist_new (uri, base_uri);
self->playlist_ts = playlist_ts;
/* Store a copy of the data */
self->last_data = g_strdup (data);
duration = 0;
partial_duration = 0;
title = NULL;
data += 7;
while (TRUE) {
gchar *r;
end = g_utf8_strchr (data, -1, '\n');
if (end)
*end = '\0';
r = g_utf8_strchr (data, -1, '\r');
if (r)
*r = '\0';
if (data[0] != '#' && data[0] != '\0') {
if (duration <= 0) {
GST_LOG ("%s: got line without EXTINF, dropping", data);
goto next_line;
}
data = uri_join (self->base_uri ? self->base_uri : self->uri, data);
/* Let's check this is not a bogus duplicate entry */
if (previous && !discontinuity && !g_strcmp0 (data, previous->uri)
&& (offset == -1 || previous->offset == offset)) {
GST_WARNING ("Dropping duplicate segment entry");
g_free (data);
data = NULL;
date_time = NULL;
duration = 0;
partial_duration = 0;
g_free (title);
title = NULL;
discontinuity = FALSE;
size = offset = -1;
is_gap = FALSE;
if (partial_segments != NULL) {
g_ptr_array_free (partial_segments, TRUE);
partial_segments = NULL;
}
goto next_line;
}
if (data != NULL) {
GstM3U8MediaSegment *file;
/* We can finally create the segment */
/* The discontinuity sequence number is only stored if the header has
* EXT-X-DISCONTINUITY-SEQUENCE present. */
file =
gst_m3u8_media_segment_new (data, title, duration, mediasequence++,
dsn, size, offset);
self->duration += duration;
file->is_gap = is_gap;
/* set encryption params */
if (current_key != NULL) {
file->key = g_strdup (current_key);
if (have_iv) {
memcpy (file->iv, iv, sizeof (iv));
} else {
/* An EXT-X-KEY tag with a KEYFORMAT of "identity" that does
* not have an IV attribute indicates that the Media Sequence
* Number is to be used as the IV when decrypting a Media
* Segment, by putting its big-endian binary representation
* into a 16-octet (128-bit) buffer and padding (on the left)
* with zeros. */
guint8 *iv = file->iv + 12;
GST_WRITE_UINT32_BE (iv, file->sequence);
}
}
file->datetime = date_time;
file->discont = discontinuity;
if (last_init_file)
file->init_file = gst_m3u8_init_file_ref (last_init_file);
file->partial_segments = partial_segments;
partial_segments = NULL;
date_time = NULL; /* Ownership was passed to the segment */
duration = 0;
partial_duration = 0;
title = NULL; /* Ownership was passed to the segment */
discontinuity = FALSE;
size = offset = -1;
g_ptr_array_add (self->segments, file);
previous = file;
}
} else if (g_str_has_prefix (data, "#EXTINF:")) {
if (!time_from_double_in_string (data + 8, &data, &duration)) {
GST_WARNING ("Can't read EXTINF duration");
goto next_line;
}
/* As of protocol version 6, targetduration is maximum segment duration
* rounded to nearest integer seconds,so can be up to 0.5 seconds too low */
if (self->targetduration > 0
&& duration > (self->targetduration + GST_SECOND / 2)) {
GST_DEBUG ("EXTINF duration (%" GST_TIME_FORMAT ") > TARGETDURATION (%"
GST_TIME_FORMAT ")", GST_TIME_ARGS (duration),
GST_TIME_ARGS (self->targetduration));
}
if (!data || *data != ',')
goto next_line;
data = g_utf8_next_char (data);
if (data != end) {
g_free (title);
title = g_strdup (data);
}
} else if (g_str_has_prefix (data, "#EXT-X-")) {
gchar *data_ext_x = data + 7;
/* All these entries start with #EXT-X- */
if (g_str_has_prefix (data_ext_x, "ENDLIST")) {
self->endlist = TRUE;
} else if (g_str_has_prefix (data_ext_x, "VERSION:")) {
if (int_from_string (data + 15, &data, &val))
self->version = val;
} else if (g_str_has_prefix (data_ext_x, "PLAYLIST-TYPE:")) {
if (!g_strcmp0 (data + 21, "VOD"))
self->type = GST_HLS_PLAYLIST_TYPE_VOD;
else if (!g_strcmp0 (data + 21, "EVENT"))
self->type = GST_HLS_PLAYLIST_TYPE_EVENT;
else
GST_WARNING ("Unknown playlist type '%s'", data + 21);
} else if (g_str_has_prefix (data_ext_x, "TARGETDURATION:")) {
if (int_from_string (data + 22, &data, &val))
self->targetduration = val * GST_SECOND;
} else if (g_str_has_prefix (data_ext_x, "MEDIA-SEQUENCE:")) {
if (int_from_string (data + 22, &data, &val))
self->media_sequence = mediasequence = val;
} else if (g_str_has_prefix (data_ext_x, "DISCONTINUITY-SEQUENCE:")) {
if (int_from_string (data + 30, &data, &val)
&& val != self->discont_sequence) {
dsn = self->discont_sequence = val;
self->has_ext_x_dsn = TRUE;
}
} else if (g_str_has_prefix (data_ext_x, "DISCONTINUITY")) {
dsn++;
discontinuity = TRUE;
} else if (g_str_has_prefix (data_ext_x, "PROGRAM-DATE-TIME:")) {
date_time = g_date_time_new_from_iso8601 (data + 25, NULL);
if (date_time)
self->ext_x_pdt_present = TRUE;
} else if (g_str_has_prefix (data_ext_x, "ALLOW-CACHE:")) {
self->allowcache = g_ascii_strcasecmp (data + 19, "YES") == 0;
} else if (g_str_has_prefix (data_ext_x, "KEY:")) {
gchar *v, *a;
data = data + 11;
/* IV and KEY are only valid until the next #EXT-X-KEY */
have_iv = FALSE;
g_free (current_key);
current_key = NULL;
while (data && parse_attributes (&data, &a, &v)) {
if (g_str_equal (a, "URI")) {
current_key =
uri_join (self->base_uri ? self->base_uri : self->uri, v);
} else if (g_str_equal (a, "IV")) {
gchar *ivp = v;
gint i;
if (strlen (ivp) < 32 + 2 || (!g_str_has_prefix (ivp, "0x")
&& !g_str_has_prefix (ivp, "0X"))) {
GST_WARNING ("Can't read IV");
continue;
}
ivp += 2;
for (i = 0; i < 16; i++) {
gint h, l;
h = g_ascii_xdigit_value (*ivp);
ivp++;
l = g_ascii_xdigit_value (*ivp);
ivp++;
if (h == -1 || l == -1) {
i = -1;
break;
}
iv[i] = (h << 4) | l;
}
if (i == -1) {
GST_WARNING ("Can't read IV");
continue;
}
have_iv = TRUE;
} else if (g_str_equal (a, "METHOD")) {
if (!g_str_equal (v, "AES-128") && !g_str_equal (v, "NONE")) {
GST_WARNING ("Encryption method %s not supported", v);
continue;
}
self->ext_x_key_present = TRUE;
}
}
} else if (g_str_has_prefix (data_ext_x, "BYTERANGE:")) {
gchar *v = data + 17;
size = -1;
offset = -1;
if (!int64_from_string (v, &v, &size))
goto next_line;
if (*v == '@' && !int64_from_string (v + 1, &v, &offset))
goto next_line;
/* Either there must be an offset, or there must
* be a previous segment to calculate from */
if (offset == -1) {
if (previous == NULL)
goto next_line;
offset = previous->offset + previous->size;
}
} else if (g_str_has_prefix (data_ext_x, "MAP:")) {
gchar *v, *a, *header_uri = NULL;
data = data + 11;
while (data != NULL && parse_attributes (&data, &a, &v)) {
if (strcmp (a, "URI") == 0) {
header_uri =
uri_join (self->base_uri ? self->base_uri : self->uri, v);
} else if (strcmp (a, "BYTERANGE") == 0) {
if (!int64_from_string (v, &v, &size)) {
g_free (header_uri);
goto next_line;
}
if (*v == '@' && !int64_from_string (v + 1, &v, &offset)) {
g_free (header_uri);
goto next_line;
}
}
}
if (header_uri) {
GstM3U8InitFile *init_file;
init_file = gst_m3u8_init_file_new (header_uri, size, offset);
if (last_init_file)
gst_m3u8_init_file_unref (last_init_file);
last_init_file = init_file;
}
} else if (g_str_has_prefix (data_ext_x, "GAP:")) {
is_gap = TRUE;
} else if (g_str_has_prefix (data_ext_x, "PART:")) {
GstM3U8PartialSegment *part = NULL;
part =
gst_m3u8_parse_partial_segment (data + strlen ("#EXT-X-PART:"),
self->base_uri ? self->base_uri : self->uri);
if (part == NULL)
goto next_line;
if (partial_segments == NULL) {
partial_segments = g_ptr_array_new_full (2,
(GDestroyNotify) gst_m3u8_partial_segment_unref);
}
g_ptr_array_add (partial_segments, part);
partial_duration += part->duration;
} else if (g_str_has_prefix (data_ext_x, "PART-INF:")) {
gchar *v, *a;
data += strlen ("#EXT-X-PART-INF:");
while (data != NULL && parse_attributes (&data, &a, &v)) {
if (strcmp (a, "PART-TARGET") == 0) {
if (!time_from_double_in_string (v, NULL,
&self->partial_targetduration)) {
GST_WARNING ("Invalid PART-TARGET");
goto next_line;
}
}
}
} else if (g_str_has_prefix (data_ext_x, "SERVER-CONTROL:")) {
data += strlen ("#EXT-X-SERVER-CONTROL:");
parse_server_control (self, data);
} else if (g_str_has_prefix (data_ext_x, "PRELOAD-HINT:")) {
GstM3U8PreloadHint *hint = NULL;
hint =
gst_m3u8_parse_preload_hint (data + strlen ("#EXT-X-PRELOAD-HINT:"),
self->base_uri ? self->base_uri : self->uri);
if (hint == NULL)
goto next_line;
if (self->preload_hints == NULL) {
self->preload_hints = g_ptr_array_new_full (1,
(GDestroyNotify) gst_m3u8_preload_hint_unref);
}
g_ptr_array_add (self->preload_hints, hint);
} else if (g_str_has_prefix (data_ext_x, "SKIP:")) {
data += strlen ("#EXT-X-SKIP:");
parse_skip_tag (self, data);
/* Increment the current MSN by the number
* of segments that were removed */
mediasequence += self->skipped_segments;
} else {
GST_LOG ("Ignored line: %s", data);
}
} else if (data[0]) {
/* Log non-empty lines */
GST_LOG ("Ignored line: `%s`", data);
}
next_line:
if (!end)
break;
data = g_utf8_next_char (end); /* skip \n */
}
/* If there are trailing partial segments at the end,
* create a dummy segment to hold them */
if (partial_segments != NULL) {
GstM3U8MediaSegment *file;
GST_DEBUG ("Creating dummy segment for trailing partial segments");
/* The discontinuity sequence number is only stored if the header has
* EXT-X-DISCONTINUITY-SEQUENCE present. */
file =
gst_m3u8_media_segment_new (NULL, title, partial_duration,
mediasequence++, dsn, size, offset);
file->partial_only = TRUE;
self->duration += partial_duration;
file->is_gap = is_gap;
/* set encryption params */
if (current_key != NULL) {
file->key = g_strdup (current_key);
if (have_iv) {
memcpy (file->iv, iv, sizeof (iv));
} else {
/* An EXT-X-KEY tag with a KEYFORMAT of "identity" that does
* not have an IV attribute indicates that the Media Sequence
* Number is to be used as the IV when decrypting a Media
* Segment, by putting its big-endian binary representation
* into a 16-octet (128-bit) buffer and padding (on the left)
* with zeros. */
guint8 *iv = file->iv + 12;
GST_WRITE_UINT32_BE (iv, file->sequence);
}
}
file->datetime = date_time;
file->discont = discontinuity;
if (last_init_file)
file->init_file = gst_m3u8_init_file_ref (last_init_file);
file->partial_segments = partial_segments;
partial_segments = NULL;
date_time = NULL; /* Ownership was passed to the partial segment */
duration = 0;
partial_duration = 0;
title = NULL; /* Ownership was passed to the partial segment */
discontinuity = FALSE;
size = offset = -1;
g_ptr_array_add (self->segments, file);
previous = file;
}
/* Clean up date that wasn't freed / handed to a segment */
g_free (current_key);
current_key = NULL;
if (date_time)
g_date_time_unref (date_time);
g_free (title);
g_free (input_data);
if (last_init_file)
gst_m3u8_init_file_unref (last_init_file);
if (self->segments->len == 0) {
GST_ERROR ("Invalid media playlist, it does not contain any media files");
gst_hls_media_playlist_unref (self);
return NULL;
}
if (!self->has_ext_x_dsn)
self->discont_sequence = 0;
/* Now go over the parsed data to ensure MSN and/or PDT are set */
if (self->ext_x_pdt_present)
gst_hls_media_playlist_postprocess_pdt (self);
/* If we are not live, the stream time can be directly applied */
if (!GST_HLS_MEDIA_PLAYLIST_IS_LIVE (self)) {
gint iter, len = self->segments->len;
GstClockTimeDiff stream_time = 0;
for (iter = 0; iter < len; iter++) {
GstM3U8MediaSegment *segment = g_ptr_array_index (self->segments, iter);
segment->stream_time = stream_time;
gst_m3u8_media_segment_fill_partial_stream_times (segment);
stream_time += segment->duration;
}
}
gst_hls_media_playlist_dump (self);
return self;
}
/* Returns TRUE if the m3u8 as the same data as playlist_data */
gboolean
gst_hls_media_playlist_has_same_data (GstHLSMediaPlaylist * self,
gchar * playlist_data)
{
gboolean ret;
GST_HLS_MEDIA_PLAYLIST_LOCK (self);
ret = self->last_data && g_str_equal (self->last_data, playlist_data);
GST_HLS_MEDIA_PLAYLIST_UNLOCK (self);
return ret;
}
/* gst_hls_media_playlist_seek() is used when performing
* an actual seek. It finds a suitable segment (or partial segment
* for LL-HLS) at which to resume playback. Only partial segments
* in the last 2 target durations of the live edge are considered
* when playing live, otherwise we might start playing a partial
* segment group that disappears before we're done with it.
* We want a segment or partial that contains a keyframe if possible
*/
gboolean
gst_hls_media_playlist_seek (GstHLSMediaPlaylist * playlist, gboolean forward,
GstSeekFlags flags, GstClockTimeDiff ts, GstM3U8SeekResult * seek_result)
{
gboolean snap_nearest =
(flags & GST_SEEK_FLAG_SNAP_NEAREST) == GST_SEEK_FLAG_SNAP_NEAREST;
gboolean snap_after =
(flags & GST_SEEK_FLAG_SNAP_AFTER) == GST_SEEK_FLAG_SNAP_AFTER;
gboolean want_keyunit = (flags & GST_SEEK_FLAG_KEY_UNIT);
guint idx;
GstM3U8MediaSegment *res = NULL;
guint res_part_idx = 0;
GstClockTime partial_window_start = GST_CLOCK_TIME_NONE;
GST_DEBUG ("target ts:%" GST_STIME_FORMAT " forward:%d playlist uri: %s",
GST_STIME_ARGS (ts), forward, playlist->uri);
/* Can't seek if there's no segments */
if (playlist->segments->len < 1)
return FALSE;
/* Calculate the threshold at which we might start inspecting partial segments */
if (flags & GST_HLS_M3U8_SEEK_FLAG_ALLOW_PARTIAL) {
GstM3U8MediaSegment *last_seg =
g_ptr_array_index (playlist->segments, playlist->segments->len - 1);
GstClockTime playlist_end = last_seg->stream_time + last_seg->duration;
if (playlist_end >= 2 * playlist->targetduration)
partial_window_start = playlist_end - 2 * playlist->targetduration;
else
partial_window_start = last_seg->stream_time;
GST_DEBUG ("Partial segment threshold %" GST_TIME_FORMAT,
GST_TIME_ARGS (partial_window_start));
}
for (idx = 0; idx < playlist->segments->len; idx++) {
GstM3U8MediaSegment *cand = g_ptr_array_index (playlist->segments, idx);
if (flags & GST_HLS_M3U8_SEEK_FLAG_ALLOW_PARTIAL &&
GST_CLOCK_TIME_IS_VALID (partial_window_start) &&
cand->stream_time + cand->duration > partial_window_start) {
/* Permitted to land at a partial segment, but only do so if
* they are in the last 2 target durations of the playlist, so we can
* be fairly sure we'll have to time download them all before
* they get removed.
*
* 6.2.2: EXT-X-PART tags SHOULD be removed from the Playlist after they are
* greater than three Target Durations from the end of the Playlist.
* Clients MUST be able to download the Partial Segment for at least
* three Target Durations after the EXT-X-PART tag is removed from the
* Playlist.
*/
if (cand->partial_segments != NULL) {
guint part_idx;
guint last_independent_idx = 0;
for (part_idx = 0; part_idx < cand->partial_segments->len; part_idx++) {
GstM3U8PartialSegment *part =
g_ptr_array_index (cand->partial_segments, part_idx);
GST_LOG ("Inspecting partial segment sn:%" G_GINT64_FORMAT
" idx %u stream_time:%" GST_STIME_FORMAT " duration:%"
GST_TIME_FORMAT, cand->sequence, part_idx,
GST_STIME_ARGS (part->stream_time),
GST_TIME_ARGS (part->duration));
if ((forward & snap_after) || snap_nearest) {
if (!want_keyunit || part->independent) {
if (part->stream_time >= ts ||
(snap_nearest
&& (ts - part->stream_time < part->duration / 2))) {
res = cand;
res_part_idx = part_idx;
goto partial_seg_out;
}
}
} else if (!forward && snap_after) {
GstClockTime next_pos = cand->stream_time + cand->duration;
if (!want_keyunit || part->independent) {
if (next_pos <= ts && ts < next_pos + cand->duration) {
res = cand;
res_part_idx = part_idx;
goto partial_seg_out;
}
}
} else if (part->stream_time <= ts
&& ts < (GstClockTimeDiff) (part->stream_time + part->duration)) {
res = cand;
if (!want_keyunit || part->independent)
res_part_idx = part_idx;
else
res_part_idx = last_independent_idx;
goto partial_seg_out;
}
if (part->independent)
last_independent_idx = part_idx;
}
}
} else if (cand->partial_only) {
/* If only full segments were requested or we're still outside the partial segment
* window, skip the last segment if it only has EXT-X-PARTs attached */
continue;
}
/* For full segment alignment, we ignore the KEY_UNIT flag and assume
* all segments have a keyframe, since HLS doesn't give us reliable info
* about that */
if ((forward & snap_after) || snap_nearest) {
if (cand->stream_time >= ts ||
(snap_nearest && (ts - cand->stream_time < cand->duration / 2))) {
res = cand;
goto out;
}
} else if (!forward && snap_after) {
GstClockTime next_pos = cand->stream_time + cand->duration;
if (next_pos <= ts && ts < next_pos + cand->duration) {
res = cand;
goto out;
}
} else if ((cand->stream_time <= ts || idx == 0)
&& ts < (GstClockTimeDiff) (cand->stream_time + cand->duration)) {
res = cand;
goto out;
}
}
out:
if (res) {
GST_DEBUG ("Returning segment sn:%" G_GINT64_FORMAT " stream_time:%"
GST_STIME_FORMAT " duration:%" GST_TIME_FORMAT, res->sequence,
GST_STIME_ARGS (res->stream_time), GST_TIME_ARGS (res->duration));
seek_result->stream_time = res->stream_time;
seek_result->segment = gst_m3u8_media_segment_ref (res);
seek_result->found_partial_segment = res->partial_only;
seek_result->part_idx = 0;
return TRUE;
}
GST_DEBUG ("Couldn't find a match");
return FALSE;
partial_seg_out:
if (res && res->partial_segments != NULL
&& res_part_idx < res->partial_segments->len) {
GstM3U8PartialSegment *part =
g_ptr_array_index (res->partial_segments, res_part_idx);
GST_DEBUG ("Returning partial segment sn:%" G_GINT64_FORMAT
" part_idx %u stream_time:%" GST_STIME_FORMAT " duration:%"
GST_TIME_FORMAT, res->sequence, res_part_idx,
GST_STIME_ARGS (part->stream_time), GST_TIME_ARGS (part->duration));
seek_result->stream_time = part->stream_time;
seek_result->segment = gst_m3u8_media_segment_ref (res);
seek_result->found_partial_segment = TRUE;
seek_result->part_idx = res_part_idx;
return TRUE;
}
GST_DEBUG ("Couldn't find a match");
return FALSE;
}
static gboolean
gst_hls_media_playlist_find_partial_position (GstHLSMediaPlaylist * playlist,
GstM3U8MediaSegment * seg, GstClockTimeDiff ts,
GstM3U8SeekResult * seek_result)
{
guint i;
/* As with full segment search below, we more often want to find our position
* near the end of a live playlist, so iterate segments backward */
for (i = seg->partial_segments->len; i > 0; i--) {
guint part_idx = i - 1;
GstM3U8PartialSegment *cand =
g_ptr_array_index (seg->partial_segments, part_idx);
GST_DEBUG ("partial segment %d ts:%" GST_STIME_FORMAT " end:%"
GST_STIME_FORMAT, part_idx, GST_STIME_ARGS (cand->stream_time),
GST_STIME_ARGS (cand->stream_time + cand->duration));
/* If the target timestamp is before this partial segment, or in the first half, this
* is the partial segment to land in */
if ((GstClockTimeDiff) (cand->stream_time + (cand->duration / 2)) >= ts &&
cand->stream_time <= (GstClockTimeDiff) (ts + (cand->duration / 2))) {
GST_DEBUG ("choosing partial segment %d", part_idx);
seek_result->segment = gst_m3u8_media_segment_ref (seg);
seek_result->found_partial_segment = TRUE;
seek_result->part_idx = part_idx;
seek_result->stream_time = cand->stream_time;
return TRUE;
}
}
return FALSE;
}
/* gst_hls_media_playlist_find_position() is used when finding the segment or
* partial segment that corresponds to our current playback position.
*
* If we're "playing partial segments", we want to find the partial segment
* whose stream_time matches the target position most closely (or fail if
* there's no partial segment, since the target partial segment was removed from
* the playlist and we lost sync.
*
* If not currently playing partial segment, find the segment with a stream_time
* that matches, or the partial segment exactly at the start of the
* 'partial_only' segment.
*/
gboolean
gst_hls_media_playlist_find_position (GstHLSMediaPlaylist * playlist,
GstClockTimeDiff ts, gboolean in_partial_segments,
GstM3U8SeekResult * seek_result)
{
guint i;
GstM3U8MediaSegment *seg = NULL, *following = NULL;
GST_DEBUG ("ts:%" GST_STIME_FORMAT
" in_partial_segments %d (live %d) playlist uri: %s", GST_STIME_ARGS (ts),
in_partial_segments, GST_HLS_MEDIA_PLAYLIST_IS_LIVE (playlist),
playlist->uri);
/* The *common* case is that we want to find our position in a live playback
* scenario, when we're playing close to the live edge, so start at the end
* of the segments and go backward */
for (i = playlist->segments->len; i != 0; i--) {
guint seg_idx = i - 1;
GstM3U8MediaSegment *cand = g_ptr_array_index (playlist->segments, seg_idx);
GST_DEBUG ("segment %d ts:%" GST_STIME_FORMAT " end:%" GST_STIME_FORMAT
" partial only: %d",
seg_idx, GST_STIME_ARGS (cand->stream_time),
GST_STIME_ARGS (cand->stream_time + cand->duration),
cand->partial_only);
/* Ignore any (disallowed by the spec) partial_only segment if
* the playlist is no longer live */
if (cand->partial_only && !GST_HLS_MEDIA_PLAYLIST_IS_LIVE (playlist))
continue;
/* If the target stream time is definitely past the end
* of this segment, no earlier segment (with lower stream time)
* could match, so we fail */
if (ts >= (GstClockTimeDiff) (cand->stream_time + (3 * cand->duration / 2))) {
break;
}
if (in_partial_segments || cand->partial_only) {
if (cand->partial_segments == NULL) {
GstClockTime partial_targetduration = playlist->partial_targetduration;
/* Default, if the playlist fails to give us a part duration (REQUIRED attribute, but
* maybe it got removed) */
if (!GST_CLOCK_TIME_IS_VALID (partial_targetduration)) {
partial_targetduration = 200 * GST_MSECOND;
}
/* If we want to match a partial segment but this segment doesn't have
* any, then the partial segment we want got removed from the playlist,
* so we need to fail, except in the specific case that our target
* timestamp is within half a part duration of the segment start
* itself (ie, we wanted the *first* partial segment
*/
if (cand->stream_time + (partial_targetduration / 2) >= ts &&
cand->stream_time <= ts + (partial_targetduration / 2)) {
GST_DEBUG ("choosing full segment %d", seg_idx);
seek_result->stream_time = seg->stream_time;
seek_result->segment = gst_m3u8_media_segment_ref (seg);
seek_result->found_partial_segment = FALSE;
return TRUE;
}
GST_DEBUG ("Couldn't find a matching partial segment");
return FALSE;
}
/* If our partial segment target ts is within half a partial duration
* of this segment start/finish, check the partial segments for a match */
if (gst_hls_media_playlist_find_partial_position (playlist, cand, ts,
seek_result)) {
GST_DEBUG ("Returning partial segment sn:%" G_GINT64_FORMAT
" part %u stream_time:%" GST_STIME_FORMAT, cand->sequence,
seek_result->part_idx, GST_STIME_ARGS (seek_result->stream_time));
return TRUE;
}
}
/* Otherwise, we're doing a full segment match so check that the timestamp
* is within half a segment duration of this segment stream_time.
*
* If the final segment has partial fragments, the target duration is used
* instead, because the partial-only last segment might be quite small (as
* it's still being created), which can cause a missed match otherwise */
GstClockTimeDiff match_threshold =
(cand->partial_only ? playlist->targetduration : cand->duration) / 2;
/* If the requesting position is beyond the halfway point of this segment,
* we should return the following segment, which is closer to the requested
* position. Note that it can be NULL */
if (ts > cand->stream_time + match_threshold) {
if (following)
GST_DEBUG ("choosing following segment %d", seg_idx + 1);
else
GST_DEBUG ("After last segment");
seg = following;
break;
}
/* Else if the requested position is within the first half we are sure it's
* this segment */
if (ts >= cand->stream_time) {
GST_DEBUG ("choosing segment %d", seg_idx);
seg = cand;
break;
}
/* Last check for the very first segment in the playlist */
if (i == 1 && cand->stream_time <= ts + match_threshold) {
GST_DEBUG ("choosing first segment");
seg = cand;
break;
}
/* We are scanning backwards, remember this as the following segment */
following = cand;
}
if (seg == NULL) {
GST_DEBUG ("Couldn't find a matching segment");
return FALSE;
}
/* The partial_only segment case should have been handled above
* by gst_hls_media_playlist_find_partial_position(). If it
* wasn't, it implies the segment we're looking for was not
* present in the available partial segments at all,
* so we need to return FALSE */
if (seg->partial_only) {
GST_DEBUG
("Couldn't find a matching partial segment in the partial_only segment");
return FALSE;
}
seek_result->stream_time = seg->stream_time;
seek_result->segment = gst_m3u8_media_segment_ref (seg);
seek_result->found_partial_segment = FALSE;
GST_DEBUG ("Returning segment sn:%" G_GINT64_FORMAT " stream_time:%"
GST_STIME_FORMAT " duration:%" GST_TIME_FORMAT, seg->sequence,
GST_STIME_ARGS (seg->stream_time), GST_TIME_ARGS (seg->duration));
return TRUE;
}
/* Recalculate all segment DSN based on the DSN of the provided anchor segment
* (which must belong to the playlist). */
static void
gst_hls_media_playlist_recalculate_dsn (GstHLSMediaPlaylist * playlist,
GstM3U8MediaSegment * anchor)
{
guint idx;
gint iter;
GstM3U8MediaSegment *cand, *prev;
if (!g_ptr_array_find (playlist->segments, anchor, &idx)) {
g_assert (FALSE);
}
g_assert (idx != -1);
GST_DEBUG ("Re-calculating DSN from segment #%d %" G_GINT64_FORMAT,
idx, anchor->discont_sequence);
/* Forward */
prev = anchor;
for (iter = idx + 1; iter < playlist->segments->len; iter++) {
cand = g_ptr_array_index (playlist->segments, iter);
if (cand->discont)
cand->discont_sequence = prev->discont_sequence + 1;
else
cand->discont_sequence = prev->discont_sequence;
prev = cand;
}
/* Backward */
prev = anchor;
for (iter = idx - 1; iter >= 0; iter--) {
cand = g_ptr_array_index (playlist->segments, iter);
if (prev->discont)
cand->discont_sequence = prev->discont_sequence - 1;
else
cand->discont_sequence = prev->discont_sequence;
prev = cand;
}
}
static void
gst_m3u8_media_segment_fill_partial_stream_times (GstM3U8MediaSegment * segment)
{
guint idx;
GstClockTimeDiff stream_time = segment->stream_time;
if (segment->partial_segments == NULL)
return;
for (idx = 0; idx < segment->partial_segments->len; idx++) {
GstM3U8PartialSegment *part =
g_ptr_array_index (segment->partial_segments, idx);
part->stream_time = stream_time;
stream_time += part->duration;
}
}
/* Recalculate all segment stream time based on the stream time of the provided
* anchor segment (which must belong to the playlist) */
void
gst_hls_media_playlist_recalculate_stream_time (GstHLSMediaPlaylist * playlist,
GstM3U8MediaSegment * anchor)
{
guint idx;
gint iter;
GstM3U8MediaSegment *cand, *prev;
if (!g_ptr_array_find (playlist->segments, anchor, &idx)) {
g_assert (FALSE);
}
g_assert (GST_CLOCK_TIME_IS_VALID (anchor->stream_time));
g_assert (idx != -1);
GST_DEBUG ("Re-calculating stream times from segment #%d %" GST_TIME_FORMAT,
idx, GST_TIME_ARGS (anchor->stream_time));
gst_m3u8_media_segment_fill_partial_stream_times (anchor);
/* Forward */
prev = anchor;
for (iter = idx + 1; iter < playlist->segments->len; iter++) {
cand = g_ptr_array_index (playlist->segments, iter);
cand->stream_time = prev->stream_time + prev->duration;
GST_DEBUG ("Forward iter %d %" GST_STIME_FORMAT, iter,
GST_STIME_ARGS (cand->stream_time));
gst_m3u8_media_segment_fill_partial_stream_times (cand);
prev = cand;
}
/* Backward */
prev = anchor;
for (iter = idx - 1; iter >= 0; iter--) {
cand = g_ptr_array_index (playlist->segments, iter);
cand->stream_time = prev->stream_time - cand->duration;
GST_DEBUG ("Backward iter %d %" GST_STIME_FORMAT, iter,
GST_STIME_ARGS (cand->stream_time));
gst_m3u8_media_segment_fill_partial_stream_times (cand);
prev = cand;
}
}
void
gst_hls_media_playlist_recalculate_stream_time_from_part (GstHLSMediaPlaylist *
playlist, GstM3U8MediaSegment * anchor, guint part_idx)
{
g_assert (anchor->partial_segments != NULL
&& part_idx < anchor->partial_segments->len);
GstClockTimeDiff last_stream_time;
GstM3U8PartialSegment *part =
g_ptr_array_index (anchor->partial_segments, part_idx);
GstM3U8PartialSegment *cand, *prev;
gint iter;
/* Work backward from the target partial segment, assigning stream times until
* we update the segment time itself, then recalculate all stream times */
prev = part;
last_stream_time = part->stream_time;
for (iter = part_idx - 1; iter >= 0; iter--) {
cand = g_ptr_array_index (anchor->partial_segments, iter);
last_stream_time = cand->stream_time = prev->stream_time - cand->duration;
GST_DEBUG ("Backward partial segment iter %d %" GST_STIME_FORMAT, iter,
GST_STIME_ARGS (cand->stream_time));
prev = cand;
}
anchor->stream_time = last_stream_time;
gst_hls_media_playlist_recalculate_stream_time (playlist, anchor);
}
/* If a segment with the same URI, size, offset, SN and DSN is present in the
* playlist, returns that one */
static GstM3U8MediaSegment *
gst_hls_media_playlist_find_by_uri (GstHLSMediaPlaylist * playlist,
GstM3U8MediaSegment * segment)
{
guint idx;
for (idx = 0; idx < playlist->segments->len; idx++) {
GstM3U8MediaSegment *cand = g_ptr_array_index (playlist->segments, idx);
if (cand->sequence == segment->sequence &&
cand->discont_sequence == segment->discont_sequence &&
cand->offset == segment->offset && cand->size == segment->size &&
!g_strcmp0 (cand->uri, segment->uri)) {
return cand;
}
}
return NULL;
}
/* Find the equivalent segment in the given playlist.
*
* The returned segment does *NOT* have increased reference !
*
* If the provided segment is just before the first entry of the playlist, it
* will be added to the playlist (with a reference) and is_before will be set to
* TRUE.
*/
static GstM3U8MediaSegment *
find_segment_in_playlist (GstHLSMediaPlaylist * playlist,
GstM3U8MediaSegment * segment, gboolean * is_before, gboolean * matched_pdt)
{
GstM3U8MediaSegment *res = NULL;
guint idx;
*is_before = FALSE;
*matched_pdt = FALSE;
/* The easy one. Happens when stream times need to be re-synced in an existing
* playlist */
if (g_ptr_array_find (playlist->segments, segment, NULL)) {
GST_DEBUG ("Present as-is in playlist");
return segment;
}
/* If there is an identical segment with the same URI and SN, use that one */
res = gst_hls_media_playlist_find_by_uri (playlist, segment);
if (res) {
GST_DEBUG ("Using same URI/DSN/SN match");
return res;
}
/* Try with PDT */
if (segment->datetime && playlist->ext_x_pdt_present) {
#ifndef GST_DISABLE_GST_DEBUG
gchar *pdtstring = g_date_time_format_iso8601 (segment->datetime);
GST_DEBUG ("Search by datetime for %s", pdtstring);
g_free (pdtstring);
#endif
for (idx = 0; idx < playlist->segments->len; idx++) {
GstM3U8MediaSegment *cand = g_ptr_array_index (playlist->segments, idx);
if (idx == 0 && cand->datetime) {
/* Special case for segments which are just before the 1st one (within
* 20ms). We add another reference because it now also belongs to the
* current playlist */
GDateTime *seg_end = g_date_time_add (segment->datetime,
segment->duration / GST_USECOND);
GstClockTimeDiff ddiff =
g_date_time_difference (cand->datetime, seg_end) * GST_USECOND;
g_date_time_unref (seg_end);
if (ABS (ddiff) < 20 * GST_MSECOND) {
/* The reference segment ends within 20ms of the first segment, it is just before */
GST_DEBUG ("Reference segment ends within %" GST_STIME_FORMAT
" of first playlist segment, inserting before",
GST_STIME_ARGS (ddiff));
g_ptr_array_insert (playlist->segments, 0,
gst_m3u8_media_segment_ref (segment));
*is_before = TRUE;
*matched_pdt = TRUE;
return segment;
}
if (ddiff > 0) {
/* If the reference segment is completely before the first segment, bail out */
GST_DEBUG ("Reference segment ends before first segment");
break;
}
}
/* The reported PDT might not be 100% identical for matching segments
* across playlists, we therefore need to take into account a certain
* tolerance otherwise we would fail to match candidates with a PDT which
* is slightly before. We therefore check whether the segment starts
* within the first third of the candidate segment.
*/
if (cand->datetime) {
GstClockTimeDiff pdtdiff = g_date_time_difference (cand->datetime,
segment->datetime) * GST_USECOND + cand->duration / 3;
if (pdtdiff >= 0) {
#ifndef GST_DISABLE_GST_DEBUG
gchar *pdtstring = g_date_time_format_iso8601 (cand->datetime);
GST_DEBUG ("Picking segment with datetime %s", pdtstring);
g_free (pdtstring);
#endif
*matched_pdt = TRUE;
return cand;
}
}
}
}
/* If not live, we can match by stream time */
if (!GST_HLS_MEDIA_PLAYLIST_IS_LIVE (playlist)) {
GST_DEBUG ("Search by Stream time for %" GST_STIME_FORMAT " duration:%"
GST_TIME_FORMAT, GST_STIME_ARGS (segment->stream_time),
GST_TIME_ARGS (segment->duration));
for (idx = 0; idx < playlist->segments->len; idx++) {
GstM3U8MediaSegment *cand = g_ptr_array_index (playlist->segments, idx);
/* If the candidate starts at or after the previous stream time */
if (cand->stream_time >= segment->stream_time) {
return cand;
}
/* If the previous end stream time is before the candidate end stream time */
if ((segment->stream_time + segment->duration) <
(cand->stream_time + cand->duration)) {
return cand;
}
}
}
/* Fallback with MSN */
GST_DEBUG ("Search by Media Sequence Number for sn:%" G_GINT64_FORMAT " dsn:%"
G_GINT64_FORMAT, segment->sequence, segment->discont_sequence);
for (idx = 0; idx < playlist->segments->len; idx++) {
GstM3U8MediaSegment *cand = g_ptr_array_index (playlist->segments, idx);
/* Ignore non-matching DSN if needed */
if ((segment->discont_sequence != cand->discont_sequence)
&& playlist->has_ext_x_dsn)
continue;
if (idx == 0 && cand->sequence == segment->sequence + 1) {
/* Special case for segments just before the 1st one. We add another
* reference because it now also belongs to the current playlist */
GST_DEBUG ("reference segment is just before 1st segment, inserting");
g_ptr_array_insert (playlist->segments, 0,
gst_m3u8_media_segment_ref (segment));
*is_before = TRUE;
return segment;
}
if (cand->sequence == segment->sequence) {
return cand;
}
}
return NULL;
}
/* Match up the first segment in a delta playlist against the reference and transfer
* over preceding segments if we can */
gboolean
gst_hls_media_playlist_sync_skipped_segments (GstHLSMediaPlaylist * m3u8,
GstHLSMediaPlaylist * reference)
{
/* Trivially there might be nothing to do (not a delta playlist) */
if (m3u8->skipped_segments < 1 || m3u8->segments->len < 1)
return TRUE;
/* find the first non-skipped segment from this playlist
* in the reference playlist, then transfer over as many
* skipped segments as we can */
GstM3U8MediaSegment *first = g_ptr_array_index (m3u8->segments, 0);
guint ref_idx;
gboolean found_ref_seg = FALSE;
for (ref_idx = 0; ref_idx < reference->segments->len; ref_idx++) {
GstM3U8MediaSegment *cand =
g_ptr_array_index (reference->segments, ref_idx);
if (cand->sequence == first->sequence &&
cand->discont_sequence == first->discont_sequence &&
cand->offset == first->offset && cand->size == first->size &&
!g_strcmp0 (cand->uri, first->uri)) {
found_ref_seg = TRUE;
break;
}
}
if (!found_ref_seg)
return FALSE; /* Couldn't match the segment */
/* Found the first segment of this playlist in the reference. Transfer over
* as many skipped segments as we can */
guint segs_avail = MIN (ref_idx, m3u8->skipped_segments);
if (segs_avail < 1)
return FALSE;
GST_DEBUG
("Transferring %u skipped segments from reference playlist starting at index %u",
segs_avail, ref_idx - segs_avail);
/* Reduce the skipped_segments count by the number we will transfer */
m3u8->skipped_segments -= segs_avail;
/* And copy over the segments */
guint cur_idx;
for (cur_idx = ref_idx - 1; segs_avail > 0; segs_avail--, cur_idx--) {
GstM3U8MediaSegment *segment =
g_ptr_array_index (reference->segments, cur_idx);
g_ptr_array_insert (m3u8->segments, 0,
gst_m3u8_media_segment_ref (segment));
}
return TRUE;
}
/* Given a media segment (potentially from another media playlist), find the
* equivalent media segment in this playlist.
*
* This will also recalculate all stream times based on that segment stream
* time (i.e. "sync" the playlist to that previous time).
*
* If an equivalent/identical one is found it is returned with
* the reference count incremented
*/
GstM3U8MediaSegment *
gst_hls_media_playlist_sync_to_segment (GstHLSMediaPlaylist * playlist,
GstM3U8MediaSegment * segment)
{
GstM3U8MediaSegment *res = NULL;
gboolean is_before;
#ifndef GST_DISABLE_GST_DEBUG
gchar *pdtstring;
#endif
g_return_val_if_fail (playlist, NULL);
g_return_val_if_fail (segment, NULL);
GST_DEBUG ("Re-syncing to segment %" GST_STIME_FORMAT " duration:%"
GST_TIME_FORMAT " sn:%" G_GINT64_FORMAT "/dsn:%" G_GINT64_FORMAT
" uri:%s in playlist %s", GST_STIME_ARGS (segment->stream_time),
GST_TIME_ARGS (segment->duration), segment->sequence,
segment->discont_sequence, segment->uri, playlist->uri);
gboolean matched_pdt = FALSE;
res = find_segment_in_playlist (playlist, segment, &is_before, &matched_pdt);
/* For live playlists we re-calculate all stream times based on the existing
* stream time. Non-live playlists have their stream time calculated at
* parsing time. */
if (res) {
if (!is_before)
gst_m3u8_media_segment_ref (res);
if (res->stream_time == GST_CLOCK_STIME_NONE) {
GstClockTimeDiff stream_time_offset = 0;
/* If there is a PDT on both segments, adjust the stream time
* by the difference to align them precisely (hopefully).
*/
if (matched_pdt) {
/* If matched_pdt is TRUE, there must be PDT present in both segments */
g_assert (res->datetime);
g_assert (segment->datetime);
stream_time_offset =
g_date_time_difference (res->datetime,
segment->datetime) * GST_USECOND;
GST_DEBUG ("Transferring stream time %" GST_STIMEP_FORMAT
" adjusted by PDT offset %" GST_STIMEP_FORMAT,
&segment->stream_time, &stream_time_offset);
}
res->stream_time = segment->stream_time + stream_time_offset;
gst_m3u8_media_segment_fill_partial_stream_times (res);
}
if (GST_HLS_MEDIA_PLAYLIST_IS_LIVE (playlist))
gst_hls_media_playlist_recalculate_stream_time (playlist, res);
/* If the playlist didn't specify a reference discont sequence number, we
* carry over the one from the reference segment */
if (!playlist->has_ext_x_dsn
&& res->discont_sequence != segment->discont_sequence) {
res->discont_sequence = segment->discont_sequence;
gst_hls_media_playlist_recalculate_dsn (playlist, res);
}
if (is_before) {
GST_DEBUG ("Dropping segment from before the playlist");
g_ptr_array_remove_index (playlist->segments, 0);
res = NULL;
}
}
#ifndef GST_DISABLE_GST_DEBUG
if (res) {
pdtstring =
res->datetime ? g_date_time_format_iso8601 (res->datetime) : NULL;
GST_DEBUG ("Returning segment sn:%" G_GINT64_FORMAT " dsn:%" G_GINT64_FORMAT
" stream_time:%" GST_STIME_FORMAT " duration:%" GST_TIME_FORMAT
" datetime:%s", res->sequence, res->discont_sequence,
GST_STIME_ARGS (res->stream_time), GST_TIME_ARGS (res->duration),
pdtstring);
g_free (pdtstring);
} else {
GST_DEBUG ("Could not find a match");
}
#endif
return res;
}
gboolean
gst_hls_media_playlist_get_starting_segment (GstHLSMediaPlaylist * self,
GstM3U8SeekResult * seek_result)
{
GstM3U8MediaSegment *res = NULL;
GST_DEBUG ("playlist %s", self->uri);
if (!GST_HLS_MEDIA_PLAYLIST_IS_LIVE (self)) {
/* For non-live, we just grab the first one */
res = g_ptr_array_index (self->segments, 0);
} else {
GstClockTime hold_back = GST_CLOCK_TIME_NONE;
GstM3U8MediaSegment *last_seg;
g_assert (self->segments->len);
last_seg = g_ptr_array_index (self->segments, self->segments->len - 1);
/* Live playlist. If low-latency, use the PART-HOLD-BACK specified distance
* from the end, otherwise HOLD-BACK distance */
if (GST_CLOCK_TIME_IS_VALID (self->part_hold_back))
hold_back = self->part_hold_back;
else if (GST_CLOCK_TIME_IS_VALID (self->partial_targetduration))
hold_back = 3 * self->partial_targetduration;
else if (GST_CLOCK_TIME_IS_VALID (self->hold_back))
hold_back = self->hold_back;
if (hold_back == GST_CLOCK_TIME_NONE) {
/* If low-latency is not enabled, or none of the above were present,
* fallback to the standard behaviour:
*
* RFC 8216 6.3.3. Playing the Media Playlist File:
*
* The client SHALL choose which Media Segment to play first from the
* Media Playlist when playback starts. If the EXT-X-ENDLIST tag is not
* present and the client intends to play the media normally, the client
* SHOULD NOT choose a segment that starts less than three target
* durations from the end of the Playlist file. Doing so can trigger
* playback stalls.
*/
hold_back = GST_M3U8_LIVE_MIN_FRAGMENT_DISTANCE * self->targetduration;
}
if (GST_CLOCK_TIME_IS_VALID (hold_back)
&& GST_CLOCK_STIME_IS_VALID (last_seg->stream_time)) {
GstSeekFlags flags =
GST_SEEK_FLAG_SNAP_BEFORE | GST_SEEK_FLAG_KEY_UNIT |
GST_HLS_M3U8_SEEK_FLAG_ALLOW_PARTIAL;
GstClockTime playlist_duration =
last_seg->stream_time + last_seg->duration;
GstClockTime target_ts;
/* Clamp the hold back so we don't go below zero */
if (hold_back > playlist_duration)
hold_back = playlist_duration;
target_ts = playlist_duration - hold_back;
GST_DEBUG ("Hold back is %" GST_TIME_FORMAT
" Looking for a segment before %" GST_TIME_FORMAT,
GST_TIME_ARGS (hold_back), GST_TIME_ARGS (target_ts));
if (gst_hls_media_playlist_seek (self, TRUE, flags, target_ts,
seek_result)) {
#ifndef GST_DISABLE_GST_DEBUG
GstClockTime distance_from_edge =
playlist_duration - seek_result->stream_time;
GST_DEBUG ("Found starting position %" GST_TIME_FORMAT " which is %"
GST_TIME_FORMAT " from the live edge",
GST_TIME_ARGS (seek_result->stream_time),
GST_TIME_ARGS (distance_from_edge));
#endif
return TRUE;
}
}
/* Worst case fallback, start 3 fragments from the end */
if (res == NULL) {
res =
g_ptr_array_index (self->segments,
MAX ((gint) self->segments->len -
GST_M3U8_LIVE_MIN_FRAGMENT_DISTANCE - 1, 0));
}
}
if (res) {
GST_DEBUG ("Using segment sn:%" G_GINT64_FORMAT " dsn:%" G_GINT64_FORMAT,
res->sequence, res->discont_sequence);
seek_result->stream_time = res->stream_time;
seek_result->segment = gst_m3u8_media_segment_ref (res);
seek_result->found_partial_segment = FALSE;
seek_result->part_idx = 0;
return TRUE;
}
return FALSE;
}
/* Calls this to carry over stream time, DSN, ... from one playlist to another.
*
* This should be used when a reference media segment couldn't be matched in the
* playlist, but we still want to carry over the information from a reference
* playlist to an updated one. This can happen with live playlists where the
* reference media segment is no longer present but the playlists intersect
*
* If the sync is sucessfull, discont will be set to TRUE if it was a perfect
* URI fragment match, else it will be FALSE (ex: match was done on PDT or
* SN/DSN).
**/
gboolean
gst_hls_media_playlist_sync_to_playlist (GstHLSMediaPlaylist * playlist,
GstHLSMediaPlaylist * reference, gboolean * discont)
{
GstM3U8MediaSegment *res = NULL;
GstM3U8MediaSegment *cand = NULL;
guint idx;
gboolean is_before;
gboolean matched_pdt = FALSE;
if (discont)
*discont = FALSE;
g_return_val_if_fail (playlist && reference, FALSE);
retry_without_dsn:
/* The new playlist is supposed to be an update of the reference playlist,
* or a more recently fetched playlist from another rendition. In either case,
* it's best to start from the last segment of the (older) reference playlist and
* go backwards to find an overlap */
for (idx = reference->segments->len; idx; idx--) {
cand = g_ptr_array_index (reference->segments, idx - 1);
res = find_segment_in_playlist (playlist, cand, &is_before, &matched_pdt);
if (res)
break;
}
if (res == NULL) {
if (playlist->has_ext_x_dsn) {
/* There is a possibility that the server doesn't have coherent DSN
* across variants/renditions. If we reach this section, this means that
* we have already attempted matching by PDT, URI, stream time. The last
* matching would have been by MSN/DSN, therefore try it again without
* taking DSN into account. */
GST_DEBUG ("Retrying matching without taking DSN into account");
playlist->has_ext_x_dsn = FALSE;
goto retry_without_dsn;
}
GST_WARNING ("Could not synchronize media playlists");
return FALSE;
}
if (discont) {
/* If not a perfect match, mark as such */
GST_DEBUG ("Checking match uri cand: %s", cand->uri);
GST_DEBUG ("Checking match uri res : %s", res->uri);
*discont = g_strcmp0 (res->uri, cand->uri) != 0;
}
/* Carry over reference stream time */
if (res->stream_time == GST_CLOCK_STIME_NONE) {
GstClockTimeDiff stream_time_offset = 0;
/* If there is a PDT on both segments, adjust the stream time
* by the difference to align them precisely (hopefully).
*/
if (matched_pdt) {
/* If matched_pdt is TRUE, there must be PDT present in both segments */
g_assert (playlist->ext_x_pdt_present && res->datetime);
g_assert (reference->ext_x_pdt_present && cand->datetime);
stream_time_offset =
g_date_time_difference (res->datetime, cand->datetime) * GST_USECOND;
GST_DEBUG ("Transferring stream time %" GST_STIMEP_FORMAT
" adjusted by PDT offset %" GST_STIMEP_FORMAT, &cand->stream_time,
&stream_time_offset);
}
res->stream_time = cand->stream_time + stream_time_offset;
gst_m3u8_media_segment_fill_partial_stream_times (res);
}
if (GST_HLS_MEDIA_PLAYLIST_IS_LIVE (playlist))
gst_hls_media_playlist_recalculate_stream_time (playlist, res);
/* If the playlist didn't specify a reference discont sequence number, we
* carry over the one from the reference segment */
if (!playlist->has_ext_x_dsn
&& res->discont_sequence != cand->discont_sequence) {
res->discont_sequence = cand->discont_sequence;
gst_hls_media_playlist_recalculate_dsn (playlist, res);
}
if (is_before) {
g_ptr_array_remove_index (playlist->segments, 0);
}
return TRUE;
}
gboolean
gst_hls_media_playlist_has_next_fragment (GstHLSMediaPlaylist * m3u8,
GstM3U8MediaSegment * current, gboolean forward)
{
guint idx;
gboolean have_next = TRUE;
g_return_val_if_fail (m3u8 != NULL, FALSE);
g_return_val_if_fail (current != NULL, FALSE);
GST_DEBUG ("playlist %s", m3u8->uri);
GST_HLS_MEDIA_PLAYLIST_LOCK (m3u8);
if (!g_ptr_array_find (m3u8->segments, current, &idx))
have_next = FALSE;
else if (idx == 0 && !forward)
have_next = FALSE;
else if (forward && idx == (m3u8->segments->len - 1))
have_next = FALSE;
GST_HLS_MEDIA_PLAYLIST_UNLOCK (m3u8);
GST_DEBUG ("Returning %d", have_next);
return have_next;
}
GstM3U8MediaSegment *
gst_hls_media_playlist_advance_fragment (GstHLSMediaPlaylist * m3u8,
GstM3U8MediaSegment * current, gboolean forward)
{
GstM3U8MediaSegment *file = NULL;
guint idx;
g_return_val_if_fail (m3u8 != NULL, NULL);
g_return_val_if_fail (current != NULL, NULL);
GST_HLS_MEDIA_PLAYLIST_LOCK (m3u8);
GST_DEBUG ("playlist %s", m3u8->uri);
if (m3u8->segments->len < 2) {
GST_DEBUG ("Playlist only contains one fragment, can't advance");
goto out;
}
if (!g_ptr_array_find (m3u8->segments, current, &idx)) {
GST_ERROR ("Requested to advance froma fragment not present in playlist");
goto out;
}
if (forward && idx < (m3u8->segments->len - 1)) {
file =
gst_m3u8_media_segment_ref (g_ptr_array_index (m3u8->segments,
idx + 1));
} else if (!forward && idx > 0) {
file =
gst_m3u8_media_segment_ref (g_ptr_array_index (m3u8->segments,
idx - 1));
}
if (file)
GST_DEBUG ("Advanced to segment sn:%" G_GINT64_FORMAT " dsn:%"
G_GINT64_FORMAT, file->sequence, file->discont_sequence);
else
GST_DEBUG ("Could not find %s fragment", forward ? "next" : "previous");
out:
GST_HLS_MEDIA_PLAYLIST_UNLOCK (m3u8);
return file;
}
GstClockTime
gst_hls_media_playlist_get_end_stream_time (GstHLSMediaPlaylist * m3u8)
{
if (m3u8->segments->len == 0)
return GST_CLOCK_TIME_NONE;
GstM3U8MediaSegment *last =
g_ptr_array_index (m3u8->segments, m3u8->segments->len - 1);
return last->stream_time + last->duration;
}
GstClockTime
gst_hls_media_playlist_get_duration (GstHLSMediaPlaylist * m3u8)
{
GstClockTime duration = GST_CLOCK_TIME_NONE;
g_return_val_if_fail (m3u8 != NULL, GST_CLOCK_TIME_NONE);
GST_DEBUG ("playlist %s", m3u8->uri);
GST_HLS_MEDIA_PLAYLIST_LOCK (m3u8);
/* We can only get the duration for on-demand streams */
if (m3u8->endlist) {
if (m3u8->segments->len) {
GstM3U8MediaSegment *first = g_ptr_array_index (m3u8->segments, 0);
GstM3U8MediaSegment *last =
g_ptr_array_index (m3u8->segments, m3u8->segments->len - 1);
duration = last->stream_time + last->duration - first->stream_time;
if (duration != m3u8->duration)
GST_ERROR ("difference in calculated duration ? %" GST_TIME_FORMAT
" vs %" GST_TIME_FORMAT, GST_TIME_ARGS (duration),
GST_TIME_ARGS (m3u8->duration));
}
duration = m3u8->duration;
}
GST_HLS_MEDIA_PLAYLIST_UNLOCK (m3u8);
GST_DEBUG ("duration %" GST_TIME_FORMAT, GST_TIME_ARGS (duration));
return duration;
}
void
gst_hls_media_playlist_get_next_msn_and_part (GstHLSMediaPlaylist * m3u8,
gint64 * next_msn, gint64 * next_part)
{
/* Return the MSN and part number that are 1 past the end of the current playlist */
if (m3u8->segments->len == 0) {
*next_msn = -1;
*next_part = -1;
return;
}
GstM3U8MediaSegment *last =
g_ptr_array_index (m3u8->segments, m3u8->segments->len - 1);
/* If low_latency mode and the last segment contains partial segments, the next playlist update is
* when one extra partial segment gets added */
if (last->partial_segments != NULL) {
*next_msn = last->sequence;
*next_part = last->partial_segments->len;
return;
}
*next_msn = last->sequence + 1;
*next_part = -1;
}
gchar *
gst_hls_media_playlist_get_uri (GstHLSMediaPlaylist * m3u8)
{
gchar *uri;
GST_HLS_MEDIA_PLAYLIST_LOCK (m3u8);
uri = g_strdup (m3u8->uri);
GST_HLS_MEDIA_PLAYLIST_UNLOCK (m3u8);
return uri;
}
gboolean
gst_hls_media_playlist_is_live (GstHLSMediaPlaylist * m3u8)
{
gboolean is_live;
g_return_val_if_fail (m3u8 != NULL, FALSE);
GST_HLS_MEDIA_PLAYLIST_LOCK (m3u8);
is_live = GST_HLS_MEDIA_PLAYLIST_IS_LIVE (m3u8);
GST_HLS_MEDIA_PLAYLIST_UNLOCK (m3u8);
return is_live;
}
static gchar *
uri_join (const gchar * uri1, const gchar * uri2)
{
gchar *uri_copy, *tmp, *ret = NULL;
if (gst_uri_is_valid (uri2))
return g_strdup (uri2);
uri_copy = g_strdup (uri1);
if (uri2[0] != '/') {
/* uri2 is a relative uri2 */
/* look for query params */
tmp = g_utf8_strchr (uri_copy, -1, '?');
if (tmp) {
/* find last / char, ignoring query params */
tmp = g_utf8_strrchr (uri_copy, tmp - uri_copy, '/');
} else {
/* find last / char in URL */
tmp = g_utf8_strrchr (uri_copy, -1, '/');
}
if (!tmp)
goto out;
*tmp = '\0';
ret = g_strdup_printf ("%s/%s", uri_copy, uri2);
} else {
/* uri2 is an absolute uri2 */
char *scheme, *hostname;
scheme = uri_copy;
/* find the : in <scheme>:// */
tmp = g_utf8_strchr (uri_copy, -1, ':');
if (!tmp)
goto out;
*tmp = '\0';
/* skip :// */
hostname = tmp + 3;
tmp = g_utf8_strchr (hostname, -1, '/');
if (tmp)
*tmp = '\0';
ret = g_strdup_printf ("%s://%s%s", scheme, hostname, uri2);
}
out:
g_free (uri_copy);
if (!ret)
GST_WARNING ("Can't build a valid uri from '%s' '%s'", uri1, uri2);
return ret;
}
gboolean
gst_hls_media_playlist_has_lost_sync (GstHLSMediaPlaylist * m3u8,
GstClockTime position)
{
GstM3U8MediaSegment *first;
if (m3u8->segments->len < 1)
return TRUE;
first = g_ptr_array_index (m3u8->segments, 0);
GST_DEBUG ("position %" GST_TIME_FORMAT " first %" GST_STIME_FORMAT
" duration %" GST_STIME_FORMAT, GST_TIME_ARGS (position),
GST_STIME_ARGS (first->stream_time), GST_STIME_ARGS (first->duration));
if (first->stream_time <= 0)
return FALSE;
/* If we're definitely before the first fragment, we lost sync */
if ((position + (first->duration / 2)) < first->stream_time)
return TRUE;
return FALSE;
}
gboolean
gst_hls_media_playlist_get_seek_range (GstHLSMediaPlaylist * m3u8,
gint64 * start, gint64 * stop)
{
GstM3U8MediaSegment *first, *last;
g_return_val_if_fail (m3u8 != NULL, FALSE);
if (m3u8->segments->len < 1)
return FALSE;
first = g_ptr_array_index (m3u8->segments, 0);
*start = first->stream_time;
/* Default is the end of the playlist */
last = g_ptr_array_index (m3u8->segments, m3u8->segments->len - 1);
*stop = last->stream_time + last->duration;
/* For live playlists, take the minimum hold back into account
* for the end of the seek range */
if (GST_HLS_MEDIA_PLAYLIST_IS_LIVE (m3u8)) {
GstM3U8SeekResult seek_result;
if (gst_hls_media_playlist_get_starting_segment (m3u8, &seek_result)) {
if (seek_result.found_partial_segment) {
GstM3U8PartialSegment *part =
g_ptr_array_index (seek_result.segment->partial_segments,
seek_result.part_idx);
*stop = part->stream_time + part->duration;
} else {
*stop =
seek_result.segment->stream_time + seek_result.segment->duration;
}
gst_m3u8_media_segment_unref (seek_result.segment);
}
}
return TRUE;
}
GstClockTime
gst_hls_media_playlist_recommended_buffering_threshold (GstHLSMediaPlaylist *
playlist)
{
if (!playlist->duration || !GST_CLOCK_TIME_IS_VALID (playlist->duration)
|| playlist->segments->len == 0)
return GST_CLOCK_TIME_NONE;
/* The recommended buffering threshold is 1.5 average segment duration */
GstClockTime threshold =
3 * (playlist->duration / playlist->segments->len) / 2;
if (GST_HLS_MEDIA_PLAYLIST_IS_LIVE (playlist)) {
/* For live playlists, reduce the recommended buffering threshold
* to match the starting hold back distance if needed, otherwise
* we'll hit the live edge and have to wait before we hit 100% */
if (GST_CLOCK_TIME_IS_VALID (playlist->hold_back)
&& threshold > playlist->hold_back)
threshold = playlist->hold_back;
else if (GST_CLOCK_TIME_IS_VALID (playlist->targetduration)
&& threshold > 3 * playlist->targetduration)
threshold = 3 * playlist->targetduration;
if (GST_CLOCK_TIME_IS_VALID (playlist->part_hold_back)
&& threshold > playlist->part_hold_back)
threshold = playlist->part_hold_back;
else if (GST_CLOCK_TIME_IS_VALID (playlist->partial_targetduration)
&& threshold > 3 * playlist->partial_targetduration)
threshold = 3 * playlist->partial_targetduration;
}
return threshold;
}
GstHLSRenditionStream *
gst_hls_rendition_stream_ref (GstHLSRenditionStream * media)
{
g_assert (media != NULL && media->ref_count > 0);
g_atomic_int_add (&media->ref_count, 1);
return media;
}
void
gst_hls_rendition_stream_unref (GstHLSRenditionStream * media)
{
g_assert (media != NULL && media->ref_count > 0);
if (g_atomic_int_dec_and_test (&media->ref_count)) {
if (media->caps)
gst_caps_unref (media->caps);
g_free (media->group_id);
g_free (media->name);
g_free (media->uri);
g_free (media->lang);
g_free (media);
}
}
static GstHLSRenditionStreamType
gst_m3u8_get_hls_media_type_from_string (const gchar * type_name)
{
if (strcmp (type_name, "AUDIO") == 0)
return GST_HLS_RENDITION_STREAM_TYPE_AUDIO;
if (strcmp (type_name, "VIDEO") == 0)
return GST_HLS_RENDITION_STREAM_TYPE_VIDEO;
if (strcmp (type_name, "SUBTITLES") == 0)
return GST_HLS_RENDITION_STREAM_TYPE_SUBTITLES;
if (strcmp (type_name, "CLOSED-CAPTIONS") == 0)
return GST_HLS_RENDITION_STREAM_TYPE_CLOSED_CAPTIONS;
return GST_HLS_RENDITION_STREAM_TYPE_INVALID;
}
#define GST_HLS_RENDITION_STREAM_TYPE_NAME(mtype) gst_hls_rendition_stream_type_get_name(mtype)
const gchar *
gst_hls_rendition_stream_type_get_name (GstHLSRenditionStreamType mtype)
{
static const gchar *nicks[GST_HLS_N_MEDIA_TYPES] = { "audio", "video",
"subtitle", "closed-captions"
};
if (mtype < 0 || mtype >= GST_HLS_N_MEDIA_TYPES)
return "invalid";
return nicks[mtype];
}
/* returns copy of string with surrounding quotation marks removed */
static gchar *
gst_m3u8_unquote (const gchar * str)
{
const gchar *start, *end;
start = strchr (str, '"');
if (start == NULL)
return g_strdup (str);
end = strchr (start + 1, '"');
if (end == NULL) {
GST_WARNING ("Broken quoted string [%s] - can't find end quote", str);
return g_strdup (start + 1);
}
return g_strndup (start + 1, (gsize) (end - (start + 1)));
}
static GstHLSRenditionStream *
gst_m3u8_parse_media (gchar * desc, const gchar * base_uri)
{
GstHLSRenditionStream *media;
gchar *a, *v;
media = g_new0 (GstHLSRenditionStream, 1);
media->ref_count = 1;
media->mtype = GST_HLS_RENDITION_STREAM_TYPE_INVALID;
GST_LOG ("parsing %s", desc);
while (desc != NULL && parse_attributes (&desc, &a, &v)) {
if (strcmp (a, "TYPE") == 0) {
media->mtype = gst_m3u8_get_hls_media_type_from_string (v);
} else if (strcmp (a, "GROUP-ID") == 0) {
g_free (media->group_id);
media->group_id = gst_m3u8_unquote (v);
} else if (strcmp (a, "NAME") == 0) {
g_free (media->name);
media->name = gst_m3u8_unquote (v);
} else if (strcmp (a, "URI") == 0) {
gchar *uri;
g_free (media->uri);
uri = gst_m3u8_unquote (v);
media->uri = uri_join (base_uri, uri);
g_free (uri);
} else if (strcmp (a, "LANGUAGE") == 0) {
g_free (media->lang);
media->lang = gst_m3u8_unquote (v);
} else if (strcmp (a, "DEFAULT") == 0) {
media->is_default = g_ascii_strcasecmp (v, "yes") == 0;
} else if (strcmp (a, "FORCED") == 0) {
media->forced = g_ascii_strcasecmp (v, "yes") == 0;
} else if (strcmp (a, "AUTOSELECT") == 0) {
media->autoselect = g_ascii_strcasecmp (v, "yes") == 0;
} else {
/* unhandled: ASSOC-LANGUAGE, INSTREAM-ID, CHARACTERISTICS,
* STABLE-RENDITION-ID, CHANNELS */
GST_FIXME ("EXT-X-MEDIA: unhandled attribute: %s = %s", a, v);
}
}
if (media->mtype == GST_HLS_RENDITION_STREAM_TYPE_INVALID)
goto required_attributes_missing;
if (media->group_id == NULL || media->name == NULL)
goto required_attributes_missing;
if (media->mtype == GST_HLS_RENDITION_STREAM_TYPE_CLOSED_CAPTIONS
&& media->uri != NULL)
goto uri_with_cc;
GST_DEBUG ("media: %s, group '%s', name '%s', uri '%s', %s %s %s, lang=%s",
GST_HLS_RENDITION_STREAM_TYPE_NAME (media->mtype), media->group_id,
media->name, media->uri, media->is_default ? "default" : "-",
media->autoselect ? "autoselect" : "-", media->forced ? "forced" : "-",
media->lang ? media->lang : "??");
return media;
uri_with_cc:
{
GST_WARNING ("closed captions EXT-X-MEDIA should not have URI specified");
goto out_error;
}
required_attributes_missing:
{
GST_WARNING ("EXT-X-MEDIA description is missing required attributes");
goto out_error;
}
out_error:
{
gst_hls_rendition_stream_unref (media);
return NULL;
}
}
GstStreamType
gst_hls_get_stream_type_from_structure (GstStructure * st)
{
const gchar *name = gst_structure_get_name (st);
if (g_str_has_prefix (name, "audio/"))
return GST_STREAM_TYPE_AUDIO;
if (g_str_has_prefix (name, "video/"))
return GST_STREAM_TYPE_VIDEO;
if (g_str_has_prefix (name, "application/x-subtitle"))
return GST_STREAM_TYPE_TEXT;
return 0;
}
GstStreamType
gst_hls_get_stream_type_from_caps (GstCaps * caps)
{
GstStreamType ret = 0;
guint i, nb;
nb = gst_caps_get_size (caps);
for (i = 0; i < nb; i++) {
GstStructure *cand = gst_caps_get_structure (caps, i);
ret |= gst_hls_get_stream_type_from_structure (cand);
}
return ret;
}
static GstHLSVariantStream *
gst_hls_variant_stream_new (void)
{
GstHLSVariantStream *stream;
stream = g_new0 (GstHLSVariantStream, 1);
stream->refcount = 1;
stream->codecs_stream_type = 0;
return stream;
}
GstHLSVariantStream *
hls_variant_stream_ref (GstHLSVariantStream * stream)
{
g_atomic_int_inc (&stream->refcount);
return stream;
}
void
hls_variant_stream_unref (GstHLSVariantStream * stream)
{
if (g_atomic_int_dec_and_test (&stream->refcount)) {
gint i;
g_free (stream->name);
g_free (stream->uri);
g_free (stream->codecs);
if (stream->caps)
gst_caps_unref (stream->caps);
for (i = 0; i < GST_HLS_N_MEDIA_TYPES; ++i) {
g_free (stream->media_groups[i]);
}
g_list_free_full (stream->fallback, g_free);
g_free (stream);
}
}
static GstHLSVariantStream *
gst_hls_variant_parse (gchar * data, const gchar * base_uri)
{
GstHLSVariantStream *stream;
gchar *v, *a;
stream = gst_hls_variant_stream_new ();
stream->iframe = g_str_has_prefix (data, "#EXT-X-I-FRAME-STREAM-INF:");
data += stream->iframe ? 26 : 18;
while (data && parse_attributes (&data, &a, &v)) {
if (g_str_equal (a, "BANDWIDTH")) {
if (!stream->bandwidth) {
if (!int_from_string (v, NULL, &stream->bandwidth))
GST_WARNING ("Error while reading BANDWIDTH");
}
} else if (g_str_equal (a, "AVERAGE-BANDWIDTH")) {
GST_DEBUG
("AVERAGE-BANDWIDTH attribute available. Using it as stream bandwidth");
if (!int_from_string (v, NULL, &stream->bandwidth))
GST_WARNING ("Error while reading AVERAGE-BANDWIDTH");
} else if (g_str_equal (a, "PROGRAM-ID")) {
if (!int_from_string (v, NULL, &stream->program_id))
GST_WARNING ("Error while reading PROGRAM-ID");
} else if (g_str_equal (a, "CODECS")) {
g_free (stream->codecs);
stream->codecs = g_strdup (v);
stream->caps = gst_codec_utils_caps_from_mime_codec (stream->codecs);
if (stream->caps != NULL) {
stream->codecs_stream_type =
gst_hls_get_stream_type_from_caps (stream->caps);
} else {
GST_WARNING ("Unhandled codec in CODECS tags: %s", v);
}
} else if (g_str_equal (a, "RESOLUTION")) {
if (!int_from_string (v, &v, &stream->width))
GST_WARNING ("Error while reading RESOLUTION width");
if (!v || *v != 'x') {
GST_WARNING ("Missing height");
} else {
v = g_utf8_next_char (v);
if (!int_from_string (v, NULL, &stream->height))
GST_WARNING ("Error while reading RESOLUTION height");
}
} else if (stream->iframe && g_str_equal (a, "URI")) {
stream->uri = uri_join (base_uri, v);
} else if (g_str_equal (a, "AUDIO")) {
g_free (stream->media_groups[GST_HLS_RENDITION_STREAM_TYPE_AUDIO]);
stream->media_groups[GST_HLS_RENDITION_STREAM_TYPE_AUDIO] =
gst_m3u8_unquote (v);
} else if (g_str_equal (a, "SUBTITLES")) {
g_free (stream->media_groups[GST_HLS_RENDITION_STREAM_TYPE_SUBTITLES]);
stream->media_groups[GST_HLS_RENDITION_STREAM_TYPE_SUBTITLES] =
gst_m3u8_unquote (v);
} else if (g_str_equal (a, "VIDEO")) {
g_free (stream->media_groups[GST_HLS_RENDITION_STREAM_TYPE_VIDEO]);
stream->media_groups[GST_HLS_RENDITION_STREAM_TYPE_VIDEO] =
gst_m3u8_unquote (v);
} else if (g_str_equal (a, "CLOSED-CAPTIONS")) {
/* closed captions will be embedded inside the video stream, ignore */
}
}
return stream;
}
static gchar *
generate_variant_stream_name (gchar * uri, gint bandwidth)
{
gchar *checksum = g_compute_checksum_for_string (G_CHECKSUM_SHA1, uri, -1);
gchar *res = g_strdup_printf ("variant-%dbps-%s", bandwidth, checksum);
g_free (checksum);
return res;
}
static GstHLSVariantStream *
find_variant_stream_by_name (GList * list, const gchar * name)
{
for (; list != NULL; list = list->next) {
GstHLSVariantStream *variant_stream = list->data;
if (variant_stream->name != NULL && !strcmp (variant_stream->name, name))
return variant_stream;
}
return NULL;
}
static GstHLSVariantStream *
find_variant_stream_by_uri (GList * list, const gchar * uri)
{
for (; list != NULL; list = list->next) {
GstHLSVariantStream *variant_stream = list->data;
if (variant_stream->uri != NULL && !strcmp (variant_stream->uri, uri))
return variant_stream;
}
return NULL;
}
static GstHLSVariantStream *
find_variant_stream_for_fallback (GList * list, GstHLSVariantStream * fallback)
{
for (; list != NULL; list = list->next) {
GstHLSVariantStream *variant_stream = list->data;
if (variant_stream->bandwidth == fallback->bandwidth &&
variant_stream->width == fallback->width &&
variant_stream->height == fallback->height &&
variant_stream->iframe == fallback->iframe &&
!g_strcmp0 (variant_stream->codecs, fallback->codecs))
return variant_stream;
}
return NULL;
}
static GstHLSMasterPlaylist *
gst_hls_master_playlist_new (void)
{
GstHLSMasterPlaylist *playlist;
playlist = g_new0 (GstHLSMasterPlaylist, 1);
playlist->refcount = 1;
playlist->is_simple = FALSE;
return playlist;
}
void
hls_master_playlist_unref (GstHLSMasterPlaylist * playlist)
{
if (g_atomic_int_dec_and_test (&playlist->refcount)) {
g_list_free_full (playlist->renditions,
(GDestroyNotify) gst_hls_rendition_stream_unref);
g_list_free_full (playlist->variants,
(GDestroyNotify) gst_hls_variant_stream_unref);
g_list_free_full (playlist->iframe_variants,
(GDestroyNotify) gst_hls_variant_stream_unref);
if (playlist->default_variant)
gst_hls_variant_stream_unref (playlist->default_variant);
g_free (playlist->last_data);
g_free (playlist);
}
}
static gint
hls_media_compare_func (GstHLSRenditionStream * ma, GstHLSRenditionStream * mb)
{
if (ma->mtype != mb->mtype)
return ma->mtype - mb->mtype;
return strcmp (ma->name, mb->name) || strcmp (ma->group_id, mb->group_id);
}
static GstCaps *
stream_get_media_caps (GstHLSVariantStream * stream,
GstHLSRenditionStreamType mtype)
{
GstStructure *st = NULL;
GstCaps *ret;
guint i, nb;
if (stream->caps == NULL)
return NULL;
nb = gst_caps_get_size (stream->caps);
for (i = 0; i < nb; i++) {
GstStructure *cand = gst_caps_get_structure (stream->caps, i);
const gchar *name = gst_structure_get_name (cand);
gboolean matched;
switch (mtype) {
case GST_HLS_RENDITION_STREAM_TYPE_AUDIO:
matched = g_str_has_prefix (name, "audio/");
break;
case GST_HLS_RENDITION_STREAM_TYPE_VIDEO:
matched = g_str_has_prefix (name, "video/");
break;
case GST_HLS_RENDITION_STREAM_TYPE_SUBTITLES:
matched = g_str_has_prefix (name, "application/x-subtitle");
break;
default:
matched = FALSE;
break;
}
if (!matched)
continue;
if (st) {
GST_WARNING ("More than one caps for the same type, can't match");
return NULL;
}
st = cand;
}
if (!st)
return NULL;
ret = gst_caps_new_empty ();
gst_caps_append_structure (ret, gst_structure_copy (st));
return ret;
}
static gint
gst_hls_variant_stream_compare_by_bitrate (gconstpointer a, gconstpointer b)
{
const GstHLSVariantStream *vs_a = (const GstHLSVariantStream *) a;
const GstHLSVariantStream *vs_b = (const GstHLSVariantStream *) b;
if (vs_a->bandwidth == vs_b->bandwidth)
return g_strcmp0 (vs_a->name, vs_b->name);
return vs_a->bandwidth - vs_b->bandwidth;
}
/**
* gst_hls_master_playlist_new_from_data:
* @data: (transfer full): The manifest to parse
* @base_uri: The URI of the manifest
*
* Parse the provided manifest and construct the master playlist.
*
* Returns: The parse GstHLSMasterPlaylist , or NULL if there was an error.
*/
GstHLSMasterPlaylist *
hls_master_playlist_new_from_data (gchar * data, const gchar * base_uri)
{
GstHLSMasterPlaylist *playlist;
GstHLSVariantStream *pending_stream, *existing_stream;
gchar *end, *free_data = data;
gint val;
GList *tmp;
GstStreamType most_seen_types = 0;
if (!g_str_has_prefix (data, "#EXTM3U")) {
GST_WARNING ("Data doesn't start with #EXTM3U");
g_free (free_data);
return NULL;
}
playlist = gst_hls_master_playlist_new ();
/* store data before we modify it for parsing */
playlist->last_data = g_strdup (data);
GST_TRACE ("data:\n%s", data);
/* Detect early whether this manifest describes a simple media playlist or
* not */
if (strstr (data, "\n#EXTINF:") != NULL) {
GST_INFO ("This is a simple media playlist, not a master playlist");
pending_stream = gst_hls_variant_stream_new ();
pending_stream->name = g_strdup ("media-playlist");
pending_stream->uri = g_strdup (base_uri);
playlist->variants = g_list_append (playlist->variants, pending_stream);
playlist->default_variant = gst_hls_variant_stream_ref (pending_stream);
playlist->is_simple = TRUE;
return playlist;
}
/* Beginning of the actual master playlist parsing */
pending_stream = NULL;
data += 7;
while (TRUE) {
gchar *r;
end = g_utf8_strchr (data, -1, '\n');
if (end)
*end = '\0';
r = g_utf8_strchr (data, -1, '\r');
if (r)
*r = '\0';
if (data[0] != '#' && data[0] != '\0') {
gchar *name, *uri;
if (pending_stream == NULL) {
GST_LOG ("%s: got non-empty line without EXT-STREAM-INF, dropping",
data);
goto next_line;
}
uri = uri_join (base_uri, data);
if (uri == NULL)
goto next_line;
pending_stream->name = name =
generate_variant_stream_name (uri, pending_stream->bandwidth);
pending_stream->uri = uri;
if (find_variant_stream_by_name (playlist->variants, name)
|| find_variant_stream_by_uri (playlist->variants, uri)) {
GST_DEBUG ("Already have a list with this name or URI: %s", name);
gst_hls_variant_stream_unref (pending_stream);
} else if ((existing_stream =
find_variant_stream_for_fallback (playlist->variants,
pending_stream))) {
GST_DEBUG ("Adding to %s fallback URI %s", existing_stream->name,
pending_stream->uri);
existing_stream->fallback =
g_list_append (existing_stream->fallback,
g_strdup (pending_stream->uri));
gst_hls_variant_stream_unref (pending_stream);
} else {
GST_INFO ("stream %s @ %u: %s", name, pending_stream->bandwidth, uri);
playlist->variants = g_list_append (playlist->variants, pending_stream);
/* use first stream in the playlist as default */
if (playlist->default_variant == NULL) {
playlist->default_variant =
gst_hls_variant_stream_ref (pending_stream);
}
}
pending_stream = NULL;
} else if (g_str_has_prefix (data, "#EXT-X-VERSION:")) {
if (int_from_string (data + 15, &data, &val))
playlist->version = val;
} else if (g_str_has_prefix (data, "#EXT-X-STREAM-INF:") ||
g_str_has_prefix (data, "#EXT-X-I-FRAME-STREAM-INF:")) {
GstHLSVariantStream *stream = gst_hls_variant_parse (data, base_uri);
if (stream->iframe) {
if (find_variant_stream_by_uri (playlist->iframe_variants, stream->uri)) {
GST_DEBUG ("Already have a list with this URI");
gst_hls_variant_stream_unref (stream);
} else {
playlist->iframe_variants =
g_list_append (playlist->iframe_variants, stream);
}
} else {
if (pending_stream != NULL) {
GST_WARNING ("variant stream without uri, dropping");
gst_hls_variant_stream_unref (pending_stream);
}
pending_stream = stream;
}
} else if (g_str_has_prefix (data, "#EXT-X-MEDIA:")) {
GstHLSRenditionStream *media;
media = gst_m3u8_parse_media (data + strlen ("#EXT-X-MEDIA:"), base_uri);
if (media == NULL)
goto next_line;
if (g_list_find_custom (playlist->renditions, media,
(GCompareFunc) hls_media_compare_func)) {
GST_DEBUG ("Dropping duplicate alternate rendition group : %s", data);
gst_hls_rendition_stream_unref (media);
goto next_line;
}
playlist->renditions = g_list_append (playlist->renditions, media);
GST_INFO ("Stored media %s / group %s", media->name, media->group_id);
} else if (*data != '\0') {
GST_LOG ("Ignored line: %s", data);
}
next_line:
if (!end)
break;
data = g_utf8_next_char (end); /* skip \n */
}
if (pending_stream != NULL) {
GST_WARNING ("#EXT-X-STREAM-INF without uri, dropping");
gst_hls_variant_stream_unref (pending_stream);
}
g_free (free_data);
if (playlist->variants == NULL) {
GST_WARNING ("Master playlist without any media playlists!");
gst_hls_master_playlist_unref (playlist);
return NULL;
}
/* reorder variants by bitrate */
playlist->variants =
g_list_sort (playlist->variants,
(GCompareFunc) gst_hls_variant_stream_compare_by_bitrate);
playlist->iframe_variants =
g_list_sort (playlist->iframe_variants,
(GCompareFunc) gst_hls_variant_stream_compare_by_bitrate);
#ifndef GST_DISABLE_GST_DEBUG
/* Sanity check : If there are no codecs, a stream shouldn't point to
* alternate rendition groups.
*
* Write a warning to help with further debugging if this causes issues
* later */
for (tmp = playlist->variants; tmp; tmp = tmp->next) {
GstHLSVariantStream *stream = tmp->data;
if (stream->codecs == NULL) {
if (stream->media_groups[0] || stream->media_groups[1]
|| stream->media_groups[2] || stream->media_groups[3]) {
GST_WARNING
("Variant specifies alternate rendition groups but has no codecs specified");
}
}
}
#endif
/* Filter out audio-only variants from audio+video stream */
for (tmp = playlist->variants; tmp; tmp = tmp->next) {
GstHLSVariantStream *stream = tmp->data;
most_seen_types |= stream->codecs_stream_type;
}
/* Flag the playlist to indicate whether all codecs are known or not on variants */
playlist->have_codecs = most_seen_types != 0;
GST_DEBUG ("have_codecs:%d most_seen_types:%d", playlist->have_codecs,
most_seen_types);
/* Filter out audio-only variants from audio+video stream */
if (playlist->have_codecs && most_seen_types != GST_STREAM_TYPE_AUDIO) {
tmp = playlist->variants;
while (tmp) {
GstHLSVariantStream *stream = tmp->data;
if (stream->codecs_stream_type != most_seen_types &&
stream->codecs_stream_type == GST_STREAM_TYPE_AUDIO) {
GST_DEBUG ("Remove variant with partial stream types %s", stream->name);
tmp = playlist->variants = g_list_remove (playlist->variants, stream);
gst_hls_variant_stream_unref (stream);
} else
tmp = tmp->next;
}
}
if (playlist->renditions) {
guint i;
/* Assign information from variants to alternate rendition groups. Note that
* at this point we know that there are caps present on the variants */
for (tmp = playlist->variants; tmp; tmp = tmp->next) {
GstHLSVariantStream *stream = tmp->data;
GST_DEBUG ("Post-processing Variant Stream '%s'", stream->name);
for (i = 0; i < GST_HLS_N_MEDIA_TYPES; ++i) {
gchar *alt_rend_group = stream->media_groups[i];
if (alt_rend_group) {
gboolean alt_in_variant = FALSE;
GstCaps *media_caps = stream_get_media_caps (stream, i);
GList *altlist;
if (!media_caps)
continue;
for (altlist = playlist->renditions; altlist; altlist = altlist->next) {
GstHLSRenditionStream *media = altlist->data;
if (media->mtype != i
|| g_strcmp0 (media->group_id, alt_rend_group))
continue;
GST_DEBUG (" %s caps:%" GST_PTR_FORMAT " media %s, uri: %s",
GST_HLS_RENDITION_STREAM_TYPE_NAME (i), media_caps, media->name,
media->uri);
if (media->uri == NULL) {
GST_DEBUG (" Media is present in main variant stream");
alt_in_variant = TRUE;
} else {
/* Assign caps to media */
if (media->caps && !gst_caps_is_equal (media->caps, media_caps)) {
GST_ERROR (" Media already has different caps %"
GST_PTR_FORMAT, media->caps);
} else {
GST_DEBUG (" Assigning caps %" GST_PTR_FORMAT, media_caps);
gst_caps_replace (&media->caps, media_caps);
}
}
}
if (!alt_in_variant) {
GstCaps *new_caps = gst_caps_subtract (stream->caps, media_caps);
gst_caps_replace (&stream->caps, new_caps);
gst_caps_unref (new_caps);
}
gst_caps_unref (media_caps);
}
}
GST_DEBUG ("Stream Ends up with caps %" GST_PTR_FORMAT, stream->caps);
}
}
GST_DEBUG
("parsed master playlist with %d streams, %d I-frame streams and %d alternative rendition groups",
g_list_length (playlist->variants),
g_list_length (playlist->iframe_variants),
g_list_length (playlist->renditions));
return playlist;
}
GstHLSVariantStream *
hls_master_playlist_get_variant_for_bitrate (GstHLSMasterPlaylist *
playlist, gboolean iframe_variant, guint bitrate,
guint min_bitrate, GList * failed_variants)
{
GstHLSVariantStream *variant = NULL;
GstHLSVariantStream *variant_by_min = NULL;
GList *l;
/* variant lists are sorted low to high, so iterate from highest to lowest */
if (iframe_variant && playlist->iframe_variants != NULL)
l = g_list_last (playlist->iframe_variants);
else
l = g_list_last (playlist->variants);
while (l != NULL) {
if (g_list_find (failed_variants, l->data) != NULL) {
/* Ignore all variants from the failed list */
l = l->prev;
continue;
}
variant = l->data;
if (variant->bandwidth >= min_bitrate)
variant_by_min = variant;
if (variant->bandwidth <= bitrate)
break;
l = l->prev;
}
/* If variant bitrate is above the min_bitrate (or min_bitrate == 0)
* return it now */
if (variant && variant->bandwidth >= min_bitrate)
return variant;
/* Otherwise, return the last (lowest bitrate) variant we saw that
* was higher than the min_bitrate */
return variant_by_min;
}
static gboolean
remove_uncommon (GQuark field_id, GValue * value, GstStructure * st2)
{
const GValue *other;
GValue dest = G_VALUE_INIT;
other = gst_structure_id_get_value (st2, field_id);
if (other == NULL || (G_VALUE_TYPE (value) != G_VALUE_TYPE (other)))
return FALSE;
if (!gst_value_intersect (&dest, value, other))
return FALSE;
g_value_reset (value);
g_value_copy (&dest, value);
g_value_reset (&dest);
return TRUE;
}
/* Merge all common structures from caps1 and caps2
*
* Returns empty caps if a structure is not present in both */
static GstCaps *
gst_caps_merge_common (GstCaps * caps1, GstCaps * caps2)
{
guint it1, it2;
GstCaps *res = gst_caps_new_empty ();
for (it1 = 0; it1 < gst_caps_get_size (caps1); it1++) {
GstStructure *st1 = gst_caps_get_structure (caps1, it1);
GstStructure *merged = NULL;
const gchar *name1 = gst_structure_get_name (st1);
for (it2 = 0; it2 < gst_caps_get_size (caps2); it2++) {
GstStructure *st2 = gst_caps_get_structure (caps2, it2);
if (gst_structure_has_name (st2, name1)) {
if (merged == NULL)
merged = gst_structure_copy (st1);
gst_structure_filter_and_map_in_place (merged,
(GstStructureFilterMapFunc) remove_uncommon, st2);
}
}
if (merged == NULL)
goto fail;
gst_caps_append_structure (res, merged);
}
return res;
fail:
{
GST_WARNING ("Failed to create common caps of %"
GST_PTR_FORMAT " and %" GST_PTR_FORMAT, caps1, caps2);
gst_caps_unref (res);
return NULL;
}
}
GstCaps *
hls_master_playlist_get_common_caps (GstHLSMasterPlaylist * playlist)
{
GList *tmp;
GstCaps *res = NULL;
for (tmp = playlist->variants; tmp; tmp = tmp->next) {
GstHLSVariantStream *stream = tmp->data;
GST_DEBUG ("stream caps %" GST_PTR_FORMAT, stream->caps);
if (!stream->caps) {
/* If one of the stream doesn't have *any* caps, we can't reliably return
* any common caps */
if (res)
gst_caps_unref (res);
res = NULL;
goto beach;
}
if (!res) {
res = gst_caps_copy (stream->caps);
} else {
GstCaps *common_caps = gst_caps_merge_common (res, stream->caps);
gst_caps_unref (res);
res = common_caps;
if (!res)
goto beach;
}
}
res = gst_caps_simplify (res);
beach:
GST_DEBUG ("Returning common caps %" GST_PTR_FORMAT, res);
return res;
}
GstStreamType
gst_stream_type_from_hls_type (GstHLSRenditionStreamType mtype)
{
switch (mtype) {
case GST_HLS_RENDITION_STREAM_TYPE_AUDIO:
return GST_STREAM_TYPE_AUDIO;
case GST_HLS_RENDITION_STREAM_TYPE_VIDEO:
return GST_STREAM_TYPE_VIDEO;
case GST_HLS_RENDITION_STREAM_TYPE_SUBTITLES:
return GST_STREAM_TYPE_TEXT;
default:
return GST_STREAM_TYPE_UNKNOWN;
}
}
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