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gstreamer/ext/hls/m3u8.c
Jan Schmidt d78686f7d4 hls: Avoid coverity warning about access off the end of an array. 
Fixes CID 1364755
2016-08-04 22:22:44 +10:00

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/* GStreamer
* Copyright (C) 2010 Marc-Andre Lureau <marcandre.lureau@gmail.com>
* Copyright (C) 2015 Tim-Philipp Müller <tim@centricular.com>
*
* 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 <string.h>
#include "gsthls.h"
#include "m3u8.h"
#define GST_CAT_DEFAULT hls_debug
static GstM3U8MediaFile *gst_m3u8_media_file_new (gchar * uri,
gchar * title, GstClockTime duration, guint sequence);
gchar *uri_join (const gchar * uri, const gchar * path);
GstM3U8 *
gst_m3u8_new (void)
{
GstM3U8 *m3u8;
m3u8 = g_new0 (GstM3U8, 1);
m3u8->current_file = NULL;
m3u8->current_file_duration = GST_CLOCK_TIME_NONE;
m3u8->sequence = -1;
m3u8->sequence_position = 0;
m3u8->highest_sequence_number = -1;
m3u8->duration = GST_CLOCK_TIME_NONE;
g_mutex_init (&m3u8->lock);
m3u8->ref_count = 1;
return m3u8;
}
/* call with M3U8_LOCK held */
static void
gst_m3u8_take_uri (GstM3U8 * self, gchar * uri, gchar * base_uri, gchar * name)
{
g_return_if_fail (self != NULL);
if (self->uri != uri) {
g_free (self->uri);
self->uri = uri;
}
if (self->base_uri != base_uri) {
g_free (self->base_uri);
self->base_uri = base_uri;
}
if (self->name != name) {
g_free (self->name);
self->name = name;
}
}
void
gst_m3u8_set_uri (GstM3U8 * m3u8, const gchar * uri, const gchar * base_uri,
const gchar * name)
{
GST_M3U8_LOCK (m3u8);
gst_m3u8_take_uri (m3u8, g_strdup (uri), g_strdup (base_uri),
g_strdup (name));
GST_M3U8_UNLOCK (m3u8);
}
GstM3U8 *
gst_m3u8_ref (GstM3U8 * m3u8)
{
g_assert (m3u8 != NULL && m3u8->ref_count > 0);
g_atomic_int_add (&m3u8->ref_count, 1);
return m3u8;
}
void
gst_m3u8_unref (GstM3U8 * 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_free (self->name);
g_list_foreach (self->files, (GFunc) gst_m3u8_media_file_unref, NULL);
g_list_free (self->files);
g_free (self->last_data);
g_free (self);
}
}
static GstM3U8MediaFile *
gst_m3u8_media_file_new (gchar * uri, gchar * title, GstClockTime duration,
guint sequence)
{
GstM3U8MediaFile *file;
file = g_new0 (GstM3U8MediaFile, 1);
file->uri = uri;
file->title = title;
file->duration = duration;
file->sequence = sequence;
file->ref_count = 1;
return file;
}
GstM3U8MediaFile *
gst_m3u8_media_file_ref (GstM3U8MediaFile * mfile)
{
g_assert (mfile != NULL && mfile->ref_count > 0);
g_atomic_int_add (&mfile->ref_count, 1);
return mfile;
}
void
gst_m3u8_media_file_unref (GstM3U8MediaFile * self)
{
g_return_if_fail (self != NULL && self->ref_count > 0);
if (g_atomic_int_dec_and_test (&self->ref_count)) {
g_free (self->title);
g_free (self->uri);
g_free (self->key);
g_free (self);
}
}
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
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;
}
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;
}
/*
* @data: a m3u8 playlist text data, taking ownership
*/
gboolean
gst_m3u8_update (GstM3U8 * self, gchar * data)
{
gint val;
GstClockTime 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;
g_return_val_if_fail (self != NULL, FALSE);
g_return_val_if_fail (data != NULL, FALSE);
GST_M3U8_LOCK (self);
/* check if the data changed since last update */
if (self->last_data && g_str_equal (self->last_data, data)) {
GST_DEBUG ("Playlist is the same as previous one");
g_free (data);
GST_M3U8_UNLOCK (self);
return TRUE;
}
if (!g_str_has_prefix (data, "#EXTM3U")) {
GST_WARNING ("Data doesn't start with #EXTM3U");
g_free (data);
GST_M3U8_UNLOCK (self);
return FALSE;
}
if (g_strrstr (data, "\n#EXT-X-STREAM-INF:") != NULL) {
GST_WARNING ("Not a media playlist, but a master playlist!");
GST_M3U8_UNLOCK (self);
return FALSE;
}
GST_TRACE ("data:\n%s", data);
g_free (self->last_data);
self->last_data = data;
self->current_file = NULL;
if (self->files) {
g_list_foreach (self->files, (GFunc) gst_m3u8_media_file_unref, NULL);
g_list_free (self->files);
self->files = NULL;
}
self->duration = GST_CLOCK_TIME_NONE;
mediasequence = 0;
/* By default, allow caching */
self->allowcache = TRUE;
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);
if (data != NULL) {
GstM3U8MediaFile *file;
file = gst_m3u8_media_file_new (data, title, duration, mediasequence++);
/* set encryption params */
file->key = current_key ? g_strdup (current_key) : NULL;
if (file->key) {
if (have_iv) {
memcpy (file->iv, iv, sizeof (iv));
} else {
guint8 *iv = file->iv + 12;
GST_WRITE_UINT32_BE (iv, file->sequence);
}
}
if (size != -1) {
file->size = size;
if (offset != -1) {
file->offset = offset;
} else {
GstM3U8MediaFile *prev = self->files ? self->files->data : NULL;
if (!prev) {
offset = 0;
} else {
offset = prev->offset + prev->size;
}
file->offset = offset;
}
} else {
file->size = -1;
file->offset = 0;
}
file->discont = discontinuity;
duration = 0;
title = NULL;
discontinuity = FALSE;
size = offset = -1;
self->files = g_list_prepend (self->files, file);
}
} else if (g_str_has_prefix (data, "#EXTINF:")) {
gdouble fval;
if (!double_from_string (data + 8, &data, &fval)) {
GST_WARNING ("Can't read EXTINF duration");
goto next_line;
}
duration = fval * (gdouble) GST_SECOND;
if (self->targetduration > 0 && duration > self->targetduration) {
GST_WARNING ("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, "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))
mediasequence = val;
} else if (g_str_has_prefix (data_ext_x, "DISCONTINUITY")) {
discontinuity = TRUE;
} else if (g_str_has_prefix (data_ext_x, "PROGRAM-DATE-TIME:")) {
/* <YYYY-MM-DDThh:mm:ssZ> */
GST_DEBUG ("FIXME parse date");
} 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")) {
GST_WARNING ("Encryption method %s not supported", v);
continue;
}
}
}
} else if (g_str_has_prefix (data_ext_x, "BYTERANGE:")) {
gchar *v = data + 17;
if (int64_from_string (v, &v, &size)) {
if (*v == '@' && !int64_from_string (v + 1, &v, &offset))
goto next_line;
} else {
goto next_line;
}
} else {
GST_LOG ("Ignored line: %s", data);
}
} else {
GST_LOG ("Ignored line: %s", data);
}
next_line:
if (!end)
break;
data = g_utf8_next_char (end); /* skip \n */
}
g_free (current_key);
current_key = NULL;
if (self->files == NULL) {
GST_ERROR ("Invalid media playlist, it does not contain any media files");
GST_M3U8_UNLOCK (self);
return FALSE;
}
self->files = g_list_reverse (self->files);
/* calculate the start and end times of this media playlist. */
{
GList *walk;
GstM3U8MediaFile *file;
GstClockTime duration = 0;
for (walk = self->files; walk; walk = walk->next) {
file = walk->data;
duration += file->duration;
if (file->sequence > self->highest_sequence_number) {
if (self->highest_sequence_number >= 0) {
/* if an update of the media playlist has been missed, there
will be a gap between self->highest_sequence_number and the
first sequence number in this media playlist. In this situation
assume that the missing fragments had a duration of
targetduration each */
self->last_file_end +=
(file->sequence - self->highest_sequence_number -
1) * self->targetduration;
}
self->last_file_end += file->duration;
self->highest_sequence_number = file->sequence;
}
}
if (GST_M3U8_IS_LIVE (self)) {
self->first_file_start = self->last_file_end - duration;
GST_DEBUG ("Live playlist range %" GST_TIME_FORMAT " -> %"
GST_TIME_FORMAT, GST_TIME_ARGS (self->first_file_start),
GST_TIME_ARGS (self->last_file_end));
}
self->duration = duration;
}
/* first-time setup */
if (self->files && self->sequence == -1) {
GList *file;
if (GST_M3U8_IS_LIVE (self)) {
gint i;
file = g_list_last (self->files);
/* for live streams, start GST_M3U8_LIVE_MIN_FRAGMENT_DISTANCE from
* the end of the playlist. See section 6.3.3 of HLS draft. Note
* the -1, because GST_M3U8_LIVE_MIN_FRAGMENT_DISTANCE = 1 means
* start 1 target-duration from the end */
for (i = 0; i < GST_M3U8_LIVE_MIN_FRAGMENT_DISTANCE - 1 && file->prev;
++i)
file = file->prev;
} else {
file = g_list_first (self->files);
}
self->current_file = file;
self->sequence = GST_M3U8_MEDIA_FILE (file->data)->sequence;
self->sequence_position = 0;
GST_DEBUG ("first sequence: %u", (guint) self->sequence);
}
GST_LOG ("processed media playlist %s, %u fragments", self->name,
g_list_length (self->files));
GST_M3U8_UNLOCK (self);
return TRUE;
}
/* call with M3U8_LOCK held */
static GList *
m3u8_find_next_fragment (GstM3U8 * m3u8, gboolean forward)
{
GstM3U8MediaFile *file;
GList *l = m3u8->files;
if (forward) {
while (l) {
file = l->data;
if (file->sequence >= m3u8->sequence)
break;
l = l->next;
}
} else {
l = g_list_last (l);
while (l) {
file = l->data;
if (file->sequence <= m3u8->sequence)
break;
l = l->prev;
}
}
return l;
}
GstM3U8MediaFile *
gst_m3u8_get_next_fragment (GstM3U8 * m3u8, gboolean forward,
GstClockTime * sequence_position, gboolean * discont)
{
GstM3U8MediaFile *file = NULL;
g_return_val_if_fail (m3u8 != NULL, NULL);
GST_M3U8_LOCK (m3u8);
GST_DEBUG ("Looking for fragment %" G_GINT64_FORMAT, m3u8->sequence);
if (m3u8->sequence < 0) /* can't happen really */
goto out;
if (m3u8->current_file == NULL)
m3u8->current_file = m3u8_find_next_fragment (m3u8, forward);
if (m3u8->current_file == NULL)
goto out;
file = gst_m3u8_media_file_ref (m3u8->current_file->data);
GST_DEBUG ("Got fragment with sequence %u (current sequence %u)",
(guint) file->sequence, (guint) m3u8->sequence);
if (sequence_position)
*sequence_position = m3u8->sequence_position;
if (discont)
*discont = file->discont || (m3u8->sequence != file->sequence);
m3u8->current_file_duration = file->duration;
m3u8->sequence = file->sequence;
out:
GST_M3U8_UNLOCK (m3u8);
return file;
}
gboolean
gst_m3u8_has_next_fragment (GstM3U8 * m3u8, gboolean forward)
{
gboolean have_next;
GList *cur;
g_return_val_if_fail (m3u8 != NULL, FALSE);
GST_M3U8_LOCK (m3u8);
GST_DEBUG ("Checking next fragment %" G_GINT64_FORMAT,
m3u8->sequence + (forward ? 1 : -1));
if (m3u8->current_file) {
cur = m3u8->current_file;
} else {
cur = m3u8_find_next_fragment (m3u8, forward);
}
have_next = (forward && cur->next) || (!forward && cur->prev);
GST_M3U8_UNLOCK (m3u8);
return have_next;
}
/* call with M3U8_LOCK held */
static void
m3u8_alternate_advance (GstM3U8 * m3u8, gboolean forward)
{
gint targetnum = m3u8->sequence;
GList *tmp;
GstM3U8MediaFile *mf;
/* figure out the target seqnum */
if (forward)
targetnum += 1;
else
targetnum -= 1;
for (tmp = m3u8->files; tmp; tmp = tmp->next) {
mf = (GstM3U8MediaFile *) tmp->data;
if (mf->sequence == targetnum)
break;
}
if (tmp == NULL) {
GST_WARNING ("Can't find next fragment");
return;
}
m3u8->current_file = tmp;
m3u8->sequence = targetnum;
m3u8->current_file_duration = GST_M3U8_MEDIA_FILE (tmp->data)->duration;
}
void
gst_m3u8_advance_fragment (GstM3U8 * m3u8, gboolean forward)
{
GstM3U8MediaFile *file;
g_return_if_fail (m3u8 != NULL);
GST_M3U8_LOCK (m3u8);
GST_DEBUG ("Sequence position was %" GST_TIME_FORMAT,
GST_TIME_ARGS (m3u8->sequence_position));
if (GST_CLOCK_TIME_IS_VALID (m3u8->current_file_duration)) {
/* Advance our position based on the previous fragment we played */
if (forward)
m3u8->sequence_position += m3u8->current_file_duration;
else if (m3u8->current_file_duration < m3u8->sequence_position)
m3u8->sequence_position -= m3u8->current_file_duration;
else
m3u8->sequence_position = 0;
m3u8->current_file_duration = GST_CLOCK_TIME_NONE;
GST_DEBUG ("Sequence position now %" GST_TIME_FORMAT,
GST_TIME_ARGS (m3u8->sequence_position));
}
if (!m3u8->current_file) {
GList *l;
GST_DEBUG ("Looking for fragment %" G_GINT64_FORMAT, m3u8->sequence);
for (l = m3u8->files; l != NULL; l = l->next) {
if (GST_M3U8_MEDIA_FILE (l->data)->sequence == m3u8->sequence) {
m3u8->current_file = l;
break;
}
}
if (m3u8->current_file == NULL) {
GST_DEBUG
("Could not find current fragment, trying next fragment directly");
m3u8_alternate_advance (m3u8, forward);
/* Resync sequence number if the above has failed for live streams */
if (m3u8->current_file == NULL && GST_M3U8_IS_LIVE (m3u8)) {
/* for live streams, start GST_M3U8_LIVE_MIN_FRAGMENT_DISTANCE from
the end of the playlist. See section 6.3.3 of HLS draft */
gint pos =
g_list_length (m3u8->files) - GST_M3U8_LIVE_MIN_FRAGMENT_DISTANCE;
m3u8->current_file = g_list_nth (m3u8->files, pos >= 0 ? pos : 0);
m3u8->current_file_duration =
GST_M3U8_MEDIA_FILE (m3u8->current_file->data)->duration;
GST_WARNING ("Resyncing live playlist");
}
goto out;
}
}
file = GST_M3U8_MEDIA_FILE (m3u8->current_file->data);
GST_DEBUG ("Advancing from sequence %u", (guint) file->sequence);
if (forward) {
m3u8->current_file = m3u8->current_file->next;
if (m3u8->current_file) {
m3u8->sequence = GST_M3U8_MEDIA_FILE (m3u8->current_file->data)->sequence;
} else {
m3u8->sequence = file->sequence + 1;
}
} else {
m3u8->current_file = m3u8->current_file->prev;
if (m3u8->current_file) {
m3u8->sequence = GST_M3U8_MEDIA_FILE (m3u8->current_file->data)->sequence;
} else {
m3u8->sequence = file->sequence - 1;
}
}
if (m3u8->current_file) {
/* Store duration of the fragment we're using to update the position
* the next time we advance */
m3u8->current_file_duration =
GST_M3U8_MEDIA_FILE (m3u8->current_file->data)->duration;
}
out:
GST_M3U8_UNLOCK (m3u8);
}
GstClockTime
gst_m3u8_get_duration (GstM3U8 * m3u8)
{
GstClockTime duration = GST_CLOCK_TIME_NONE;
g_return_val_if_fail (m3u8 != NULL, GST_CLOCK_TIME_NONE);
GST_M3U8_LOCK (m3u8);
/* We can only get the duration for on-demand streams */
if (!m3u8->endlist)
goto out;
if (!GST_CLOCK_TIME_IS_VALID (m3u8->duration) && m3u8->files != NULL) {
GList *f;
m3u8->duration = 0;
for (f = m3u8->files; f != NULL; f = f->next)
m3u8->duration += GST_M3U8_MEDIA_FILE (f)->duration;
}
duration = m3u8->duration;
out:
GST_M3U8_UNLOCK (m3u8);
return duration;
}
GstClockTime
gst_m3u8_get_target_duration (GstM3U8 * m3u8)
{
GstClockTime target_duration;
g_return_val_if_fail (m3u8 != NULL, GST_CLOCK_TIME_NONE);
GST_M3U8_LOCK (m3u8);
target_duration = m3u8->targetduration;
GST_M3U8_UNLOCK (m3u8);
return target_duration;
}
gchar *
gst_m3u8_get_uri (GstM3U8 * m3u8)
{
gchar *uri;
GST_M3U8_LOCK (m3u8);
uri = g_strdup (m3u8->uri);
GST_M3U8_UNLOCK (m3u8);
return uri;
}
gboolean
gst_m3u8_is_live (GstM3U8 * m3u8)
{
gboolean is_live;
g_return_val_if_fail (m3u8 != NULL, FALSE);
GST_M3U8_LOCK (m3u8);
is_live = GST_M3U8_IS_LIVE (m3u8);
GST_M3U8_UNLOCK (m3u8);
return is_live;
}
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) {
GST_WARNING ("Can't build a valid uri_copy");
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) {
GST_WARNING ("Can't build a valid uri_copy");
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);
return ret;
}
gboolean
gst_m3u8_get_seek_range (GstM3U8 * m3u8, gint64 * start, gint64 * stop)
{
GstClockTime duration = 0;
GList *walk;
GstM3U8MediaFile *file;
guint count;
guint min_distance = 0;
g_return_val_if_fail (m3u8 != NULL, FALSE);
GST_M3U8_LOCK (m3u8);
if (m3u8->files == NULL)
goto out;
if (GST_M3U8_IS_LIVE (m3u8)) {
/* min_distance is used to make sure the seek range is never closer than
GST_M3U8_LIVE_MIN_FRAGMENT_DISTANCE fragments from the end of a live
playlist - see 6.3.3. "Playing the Playlist file" of the HLS draft */
min_distance = GST_M3U8_LIVE_MIN_FRAGMENT_DISTANCE;
}
count = g_list_length (m3u8->files);
for (walk = m3u8->files; walk && count >= min_distance; walk = walk->next) {
file = walk->data;
--count;
duration += file->duration;
}
if (duration <= 0)
goto out;
*start = m3u8->first_file_start;
*stop = *start + duration;
out:
GST_M3U8_UNLOCK (m3u8);
return (duration > 0);
}
GstHLSMedia *
gst_hls_media_ref (GstHLSMedia * media)
{
g_assert (media != NULL && media->ref_count > 0);
g_atomic_int_add (&media->ref_count, 1);
return media;
}
void
gst_hls_media_unref (GstHLSMedia * media)
{
g_assert (media != NULL && media->ref_count > 0);
if (g_atomic_int_dec_and_test (&media->ref_count)) {
g_free (media->group_id);
g_free (media->name);
g_free (media->uri);
g_free (media);
}
}
static GstHLSMediaType
gst_m3u8_get_hls_media_type_from_string (const gchar * type_name)
{
if (strcmp (type_name, "AUDIO") == 0)
return GST_HLS_MEDIA_TYPE_AUDIO;
if (strcmp (type_name, "VIDEO") == 0)
return GST_HLS_MEDIA_TYPE_VIDEO;
if (strcmp (type_name, "SUBTITLES") == 0)
return GST_HLS_MEDIA_TYPE_SUBTITLES;
if (strcmp (type_name, "CLOSED_CAPTIONS") == 0)
return GST_HLS_MEDIA_TYPE_CLOSED_CAPTIONS;
return GST_HLS_MEDIA_TYPE_INVALID;
}
#define GST_HLS_MEDIA_TYPE_NAME(mtype) gst_m3u8_hls_media_type_get_nick(mtype)
static inline const gchar *
gst_m3u8_hls_media_type_get_nick (GstHLSMediaType 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 unquoted copy of string */
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 GstHLSMedia *
gst_m3u8_parse_media (gchar * desc, const gchar * base_uri)
{
GstHLSMediaType mtype = GST_HLS_MEDIA_TYPE_INVALID;
GstHLSMedia *media;
gchar *a, *v;
media = g_new0 (GstHLSMedia, 1);
media->ref_count = 1;
media->playlist = gst_m3u8_new ();
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 */
GST_FIXME ("EXT-X-MEDIA: unhandled attribute: %s = %s", a, v);
}
}
if (media->mtype == GST_HLS_MEDIA_TYPE_INVALID)
goto required_attributes_missing;
if (media->uri == NULL)
goto existing_stream;
if (media->group_id == NULL || media->name == NULL)
goto required_attributes_missing;
if (mtype == GST_HLS_MEDIA_TYPE_CLOSED_CAPTIONS)
goto uri_with_cc;
GST_DEBUG ("media: %s, group '%s', name '%s', uri '%s', %s %s %s, lang=%s",
GST_HLS_MEDIA_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;
/* fall through */
}
existing_stream:
{
GST_DEBUG ("EXT-X-MEDIA without URI, describes embedded stream, skipping");
/* fall through */
}
out_error:
{
gst_hls_media_unref (media);
return NULL;
}
}
static GstHLSVariantStream *
gst_hls_variant_stream_new (void)
{
GstHLSVariantStream *stream;
stream = g_new0 (GstHLSVariantStream, 1);
stream->m3u8 = gst_m3u8_new ();
stream->refcount = 1;
return stream;
}
GstHLSVariantStream *
gst_hls_variant_stream_ref (GstHLSVariantStream * stream)
{
g_atomic_int_inc (&stream->refcount);
return stream;
}
void
gst_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);
gst_m3u8_unref (stream->m3u8);
for (i = 0; i < GST_HLS_N_MEDIA_TYPES; ++i) {
g_free (stream->media_groups[i]);
g_list_free_full (stream->media[i], (GDestroyNotify) gst_hls_media_unref);
}
g_free (stream);
}
}
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 GstHLSMasterPlaylist *
gst_hls_master_playlist_new (void)
{
GstHLSMasterPlaylist *playlist;
playlist = g_new0 (GstHLSMasterPlaylist, 1);
playlist->refcount = 1;
playlist->is_simple = FALSE;
return playlist;
}
void
gst_hls_master_playlist_unref (GstHLSMasterPlaylist * playlist)
{
if (g_atomic_int_dec_and_test (&playlist->refcount)) {
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);
g_free (playlist->last_data);
g_free (playlist);
}
}
static gint
hls_media_name_compare_func (gconstpointer media, gconstpointer name)
{
return strcmp (((GstHLSMedia *) media)->name, (const gchar *) name);
}
/* Takes ownership of @data */
GstHLSMasterPlaylist *
gst_hls_master_playlist_new_from_data (gchar * data, const gchar * base_uri)
{
GHashTable *media_groups[GST_HLS_N_MEDIA_TYPES] = { NULL, };
GstHLSMasterPlaylist *playlist;
GstHLSVariantStream *pending_stream;
gchar *end, *free_data = data;
gint val, i;
GList *l;
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);
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 (base_uri);
pending_stream->uri = g_strdup (base_uri);
gst_m3u8_set_uri (pending_stream->m3u8, base_uri, NULL, 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;
if (!gst_m3u8_update (pending_stream->m3u8, data)) {
GST_WARNING ("Failed to parse media playlist");
gst_hls_master_playlist_unref (playlist);
playlist = NULL;
}
return playlist;
}
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 line without EXT-STREAM-INF, dropping", data);
goto next_line;
}
name = data;
uri = uri_join (base_uri, name);
if (uri == NULL)
goto next_line;
pending_stream->name = g_strdup (name);
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 {
GST_INFO ("stream %s @ %u: %s", name, pending_stream->bandwidth, uri);
gst_m3u8_set_uri (pending_stream->m3u8, uri, NULL, name);
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;
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 (!int_from_string (v, NULL, &stream->bandwidth))
GST_WARNING ("Error while reading 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);
} 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);
if (stream->uri != NULL) {
stream->name = g_strdup (stream->uri);
gst_m3u8_set_uri (stream->m3u8, stream->uri, NULL, stream->name);
} else {
gst_hls_variant_stream_unref (stream);
}
} else if (g_str_equal (a, "AUDIO")) {
g_free (stream->media_groups[GST_HLS_MEDIA_TYPE_AUDIO]);
stream->media_groups[GST_HLS_MEDIA_TYPE_AUDIO] = gst_m3u8_unquote (v);
} else if (g_str_equal (a, "SUBTITLES")) {
g_free (stream->media_groups[GST_HLS_MEDIA_TYPE_SUBTITLES]);
stream->media_groups[GST_HLS_MEDIA_TYPE_SUBTITLES] =
gst_m3u8_unquote (v);
} else if (g_str_equal (a, "VIDEO")) {
g_free (stream->media_groups[GST_HLS_MEDIA_TYPE_VIDEO]);
stream->media_groups[GST_HLS_MEDIA_TYPE_VIDEO] = gst_m3u8_unquote (v);
} else if (g_str_equal (a, "CLOSED-CAPTIONS")) {
/* closed captions will be embedded inside the video stream, ignore */
}
}
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:")) {
GstHLSMedia *media;
GList *list;
media = gst_m3u8_parse_media (data + strlen ("#EXT-X-MEDIA:"), base_uri);
if (media == NULL)
goto next_line;
if (media_groups[media->mtype] == NULL) {
media_groups[media->mtype] =
g_hash_table_new_full (g_str_hash, g_str_equal, g_free, NULL);
}
list = g_hash_table_lookup (media_groups[media->mtype], media->group_id);
/* make sure there isn't already a media with the same name */
if (!g_list_find_custom (list, media->name, hls_media_name_compare_func)) {
g_hash_table_replace (media_groups[media->mtype],
g_strdup (media->group_id), g_list_append (list, media));
GST_INFO ("Added media %s to group %s", media->name, media->group_id);
} else {
GST_WARNING (" media with name '%s' already exists in group '%s'!",
media->name, media->group_id);
gst_hls_media_unref (media);
}
} 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);
/* Add alternative renditions media to variant streams */
for (l = playlist->variants; l != NULL; l = l->next) {
GstHLSVariantStream *stream = l->data;
GList *mlist;
for (i = 0; i < GST_HLS_N_MEDIA_TYPES; ++i) {
if (stream->media_groups[i] != NULL && media_groups[i] != NULL) {
GST_INFO ("Adding %s group '%s' to stream '%s'",
GST_HLS_MEDIA_TYPE_NAME (i), stream->media_groups[i], stream->name);
mlist = g_hash_table_lookup (media_groups[i], stream->media_groups[i]);
if (mlist == NULL)
GST_WARNING ("Group '%s' does not exist!", stream->media_groups[i]);
while (mlist != NULL) {
GstHLSMedia *media = mlist->data;
GST_DEBUG (" %s media %s, uri: %s", GST_HLS_MEDIA_TYPE_NAME (i),
media->name, media->uri);
stream->media[i] =
g_list_append (stream->media[i], gst_hls_media_ref (media));
mlist = mlist->next;
}
}
}
}
/* clean up our temporary alternative rendition groups hash tables */
for (i = 0; i < GST_HLS_N_MEDIA_TYPES; ++i) {
if (media_groups[i] != NULL) {
GList *groups, *mlist;
groups = g_hash_table_get_keys (media_groups[i]);
for (l = groups; l != NULL; l = l->next) {
mlist = g_hash_table_lookup (media_groups[i], l->data);
g_list_free_full (mlist, (GDestroyNotify) gst_hls_media_unref);
}
g_list_free (groups);
g_hash_table_unref (media_groups[i]);
}
}
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);
/* FIXME: restore old current_variant after master playlist update
* (move into code that does that update) */
#if 0
{
gchar *top_variant_uri = NULL;
gboolean iframe = FALSE;
if (!self->current_variant) {
top_variant_uri = GST_M3U8 (self->lists->data)->uri;
} else {
top_variant_uri = GST_M3U8 (self->current_variant->data)->uri;
iframe = GST_M3U8 (self->current_variant->data)->iframe;
}
/* here we sorted the lists */
if (iframe)
playlist->current_variant =
find_variant_stream_by_uri (playlist->iframe_variants,
top_variant_uri);
else
playlist->current_variant =
find_variant_stream_by_uri (playlist->variants, top_variant_uri);
}
#endif
GST_DEBUG ("parsed master playlist with %d streams and %d I-frame streams",
g_list_length (playlist->variants),
g_list_length (playlist->iframe_variants));
return playlist;
}
gboolean
gst_hls_variant_stream_is_live (GstHLSVariantStream * variant)
{
gboolean is_live;
g_return_val_if_fail (variant != NULL, FALSE);
is_live = gst_m3u8_is_live (variant->m3u8);
return is_live;
}
static gint
compare_media (const GstHLSMedia * a, const GstHLSMedia * b)
{
return strcmp (a->name, b->name);
}
GstHLSMedia *
gst_hls_variant_find_matching_media (GstHLSVariantStream * stream,
GstHLSMedia * media)
{
GList *mlist = stream->media[media->mtype];
GList *match;
if (mlist == NULL)
return NULL;
match = g_list_find_custom (mlist, media, (GCompareFunc) compare_media);
if (match == NULL)
return NULL;
return match->data;
}
GstHLSVariantStream *
gst_hls_master_playlist_get_variant_for_bitrate (GstHLSMasterPlaylist *
playlist, GstHLSVariantStream * current_variant, guint bitrate)
{
GstHLSVariantStream *variant = current_variant;
GList *l;
/* variant lists are sorted low to high, so iterate from highest to lowest */
if (current_variant == NULL || !current_variant->iframe)
l = g_list_last (playlist->variants);
else
l = g_list_last (playlist->iframe_variants);
while (l != NULL) {
variant = l->data;
if (variant->bandwidth <= bitrate)
break;
l = l->prev;
}
return variant;
}
GstHLSVariantStream *
gst_hls_master_playlist_get_matching_variant (GstHLSMasterPlaylist * playlist,
GstHLSVariantStream * current_variant)
{
if (current_variant->iframe) {
return find_variant_stream_by_uri (playlist->iframe_variants,
current_variant->uri);
}
return find_variant_stream_by_uri (playlist->variants, current_variant->uri);
}
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