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gstreamer/ext/hls/m3u8.c
Alex Ashley a08dd85608 hlsdemux: select correct starting position for live streams 
When playing live HLS streams, the media playback starts from the
beginning of the media playlist. When playing a live HLS stream,
media playback should start from 3 fragments from the end of the
playlist.

See section 6.3.3. of the HLS draft [1]

This commit changes the logic to select 3 fragments from the end when
playing a live stream.

[1] http://tools.ietf.org/html/draft-pantos-http-live-streaming-12#page-29

https://bugzilla.gnome.org/show_bug.cgi?id=727742
2015-02-20 19:00:01 -03:00

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/* GStreamer
* Copyright (C) 2010 Marc-Andre Lureau <marcandre.lureau@gmail.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 "gstfragmented.h"
#include "m3u8.h"
#define GST_CAT_DEFAULT fragmented_debug
#if !GLIB_CHECK_VERSION (2, 33, 4)
#define g_list_copy_deep gst_g_list_copy_deep
static GList *
gst_g_list_copy_deep (GList * list, GCopyFunc func, gpointer user_data)
{
list = g_list_copy (list);
if (func != NULL) {
GList *l;
for (l = list; l != NULL; l = l->next) {
l->data = func (l->data, user_data);
}
}
return list;
}
#endif
static GstM3U8 *gst_m3u8_new (void);
static void gst_m3u8_free (GstM3U8 * m3u8);
static gboolean gst_m3u8_update (GstM3U8Client * client, GstM3U8 * m3u8,
gchar * data, gboolean * updated);
static GstM3U8MediaFile *gst_m3u8_media_file_new (gchar * uri,
gchar * title, GstClockTime duration, guint sequence);
static void gst_m3u8_media_file_free (GstM3U8MediaFile * self);
gchar *uri_join (const gchar * uri, const gchar * path);
static GstM3U8 *
gst_m3u8_new (void)
{
GstM3U8 *m3u8;
m3u8 = g_new0 (GstM3U8, 1);
return m3u8;
}
static void
gst_m3u8_set_uri (GstM3U8 * self, gchar * uri, gchar * base_uri, gchar * name)
{
g_return_if_fail (self != NULL);
g_free (self->uri);
self->uri = uri;
g_free (self->base_uri);
self->base_uri = base_uri;
g_free (self->name);
self->name = name;
}
static void
gst_m3u8_free (GstM3U8 * self)
{
g_return_if_fail (self != NULL);
g_free (self->uri);
g_free (self->base_uri);
g_free (self->name);
g_free (self->codecs);
g_list_foreach (self->files, (GFunc) gst_m3u8_media_file_free, NULL);
g_list_free (self->files);
g_free (self->last_data);
g_list_foreach (self->lists, (GFunc) gst_m3u8_free, NULL);
g_list_free (self->lists);
g_list_foreach (self->iframe_lists, (GFunc) gst_m3u8_free, NULL);
g_list_free (self->iframe_lists);
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;
return file;
}
static void
gst_m3u8_media_file_free (GstM3U8MediaFile * self)
{
g_return_if_fail (self != NULL);
g_free (self->title);
g_free (self->uri);
g_free (self->key);
g_free (self);
}
static GstM3U8MediaFile *
gst_m3u8_media_file_copy (const GstM3U8MediaFile * self, gpointer user_data)
{
g_return_val_if_fail (self != NULL, NULL);
return gst_m3u8_media_file_new (g_strdup (self->uri), g_strdup (self->title),
self->duration, self->sequence);
}
static GstM3U8 *
_m3u8_copy (const GstM3U8 * self, GstM3U8 * parent)
{
GstM3U8 *dup;
g_return_val_if_fail (self != NULL, NULL);
dup = gst_m3u8_new ();
dup->uri = g_strdup (self->uri);
dup->base_uri = g_strdup (self->base_uri);
dup->name = g_strdup (self->name);
dup->endlist = self->endlist;
dup->version = self->version;
dup->targetduration = self->targetduration;
dup->allowcache = self->allowcache;
dup->bandwidth = self->bandwidth;
dup->program_id = self->program_id;
dup->codecs = g_strdup (self->codecs);
dup->width = self->width;
dup->height = self->height;
dup->iframe = self->iframe;
dup->files =
g_list_copy_deep (self->files, (GCopyFunc) gst_m3u8_media_file_copy,
NULL);
/* private */
dup->last_data = g_strdup (self->last_data);
dup->lists = g_list_copy_deep (self->lists, (GCopyFunc) _m3u8_copy, dup);
dup->iframe_lists =
g_list_copy_deep (self->iframe_lists, (GCopyFunc) _m3u8_copy, dup);
/* NOTE: current_variant will get set in gst_m3u8_copy () */
dup->parent = parent;
dup->mediasequence = self->mediasequence;
return dup;
}
static GstM3U8 *
gst_m3u8_copy (const GstM3U8 * self)
{
GList *entry;
guint n;
GstM3U8 *dup = _m3u8_copy (self, NULL);
if (self->current_variant != NULL) {
for (n = 0, entry = self->lists; entry; entry = entry->next, n++) {
if (entry == self->current_variant) {
dup->current_variant = g_list_nth (dup->lists, n);
break;
}
}
if (!dup->current_variant) {
for (n = 0, entry = self->iframe_lists; entry; entry = entry->next, n++) {
if (entry == self->current_variant) {
dup->current_variant = g_list_nth (dup->iframe_lists, n);
break;
}
}
if (!dup->current_variant) {
GST_ERROR ("Failed to determine current playlist");
}
}
}
return dup;
}
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;
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) {
*v = g_utf8_next_char (*v);
*p = '\0';
} else {
GST_WARNING ("missing = after attribute");
return FALSE;
}
*ptr = end;
return TRUE;
}
static gchar *
unquote_string (gchar * string)
{
gchar *string_ret;
string_ret = strchr (string, '"');
if (string_ret != NULL) {
/* found initialization quotation mark of string */
string = string_ret + 1;
string_ret = strchr (string, '"');
if (string_ret != NULL) {
/* found finalizing quotation mark of string */
string_ret[0] = '\0';
} else {
GST_WARNING
("wrong string unqouting - cannot find finalizing quotation mark");
return NULL;
}
}
return string;
}
static gint
_m3u8_compare_uri (GstM3U8 * a, gchar * uri)
{
g_return_val_if_fail (a != NULL, 0);
g_return_val_if_fail (uri != NULL, 0);
return g_strcmp0 (a->uri, uri);
}
static gint
gst_m3u8_compare_playlist_by_bitrate (gconstpointer a, gconstpointer b)
{
return ((GstM3U8 *) (a))->bandwidth - ((GstM3U8 *) (b))->bandwidth;
}
/*
* @data: a m3u8 playlist text data, taking ownership
*/
static gboolean
gst_m3u8_update (GstM3U8Client * client, GstM3U8 * self, gchar * data,
gboolean * updated)
{
gint val;
GstClockTime duration;
gchar *title, *end;
gboolean discontinuity = FALSE;
GstM3U8 *list;
gchar *current_key = NULL;
gboolean have_iv = FALSE;
guint8 iv[16] = { 0, };
gint64 size = -1, offset = -1;
g_return_val_if_fail (self != NULL, FALSE);
g_return_val_if_fail (data != NULL, FALSE);
g_return_val_if_fail (updated != NULL, FALSE);
*updated = TRUE;
/* 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");
*updated = FALSE;
g_free (data);
return TRUE;
}
if (!g_str_has_prefix (data, "#EXTM3U")) {
GST_WARNING ("Data doesn't start with #EXTM3U");
*updated = FALSE;
g_free (data);
return FALSE;
}
g_free (self->last_data);
self->last_data = data;
client->current_file = NULL;
if (self->files) {
g_list_foreach (self->files, (GFunc) gst_m3u8_media_file_free, NULL);
g_list_free (self->files);
self->files = NULL;
}
client->duration = GST_CLOCK_TIME_NONE;
/* By default, allow caching */
self->allowcache = TRUE;
list = NULL;
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') {
gchar *name = data;
if (duration <= 0 && list == NULL) {
GST_LOG ("%s: got line without EXTINF or EXTSTREAMINF, dropping", data);
goto next_line;
}
data = uri_join (self->base_uri ? self->base_uri : self->uri, data);
if (data == NULL)
goto next_line;
if (list != NULL) {
if (g_list_find_custom (self->lists, data,
(GCompareFunc) _m3u8_compare_uri)) {
GST_DEBUG ("Already have a list with this URI");
gst_m3u8_free (list);
g_free (data);
} else {
gst_m3u8_set_uri (list, data, NULL, g_strdup (name));
self->lists = g_list_append (self->lists, list);
}
list = NULL;
} else {
GstM3U8MediaFile *file;
file =
gst_m3u8_media_file_new (data, title, duration,
self->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 (duration > self->targetduration)
GST_WARNING ("EXTINF duration > 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, "STREAM-INF:") ||
g_str_has_prefix (data_ext_x, "I-FRAME-STREAM-INF:")) {
gchar *v, *a;
gboolean iframe = g_str_has_prefix (data_ext_x, "I-FRAME-STREAM-INF:");
GstM3U8 *new_list;
new_list = gst_m3u8_new ();
new_list->parent = self;
new_list->iframe = iframe;
data = data + (iframe ? 26 : 18);
while (data && parse_attributes (&data, &a, &v)) {
if (g_str_equal (a, "BANDWIDTH")) {
if (!int_from_string (v, NULL, &new_list->bandwidth))
GST_WARNING ("Error while reading BANDWIDTH");
} else if (g_str_equal (a, "PROGRAM-ID")) {
if (!int_from_string (v, NULL, &new_list->program_id))
GST_WARNING ("Error while reading PROGRAM-ID");
} else if (g_str_equal (a, "CODECS")) {
g_free (new_list->codecs);
new_list->codecs = g_strdup (v);
} else if (g_str_equal (a, "RESOLUTION")) {
if (!int_from_string (v, &v, &new_list->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, &new_list->height))
GST_WARNING ("Error while reading RESOLUTION height");
}
} else if (iframe && g_str_equal (a, "URI")) {
gchar *name;
gchar *uri = g_strdup (v);
gchar *urip = uri;
uri = unquote_string (uri);
if (uri) {
uri = uri_join (self->base_uri ? self->base_uri : self->uri, uri);
if (uri == NULL) {
g_free (urip);
continue;
}
name = g_strdup (uri);
gst_m3u8_set_uri (new_list, uri, NULL, name);
} else {
GST_WARNING
("Cannot remove quotation marks from i-frame-stream URI");
}
g_free (urip);
}
}
if (iframe) {
if (g_list_find_custom (self->iframe_lists, new_list->uri,
(GCompareFunc) _m3u8_compare_uri)) {
GST_DEBUG ("Already have a list with this URI");
gst_m3u8_free (new_list);
} else {
self->iframe_lists = g_list_append (self->iframe_lists, new_list);
}
} else if (list != NULL) {
GST_WARNING ("Found a list without a uri..., dropping");
gst_m3u8_free (list);
} else {
list = new_list;
}
} 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->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")) {
gchar *key = g_strdup (v);
gchar *keyp = key;
key = unquote_string (key);
if (key) {
current_key =
uri_join (self->base_uri ? self->base_uri : self->uri, key);
} else {
GST_WARNING
("Cannot remove quotation marks from decryption key URI");
}
g_free (keyp);
} 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;
self->files = g_list_reverse (self->files);
/* reorder playlists by bitrate */
if (self->lists) {
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;
}
self->lists =
g_list_sort (self->lists,
(GCompareFunc) gst_m3u8_compare_playlist_by_bitrate);
self->iframe_lists =
g_list_sort (self->iframe_lists,
(GCompareFunc) gst_m3u8_compare_playlist_by_bitrate);
if (iframe)
self->current_variant =
g_list_find_custom (self->iframe_lists, top_variant_uri,
(GCompareFunc) _m3u8_compare_uri);
else
self->current_variant = g_list_find_custom (self->lists, top_variant_uri,
(GCompareFunc) _m3u8_compare_uri);
}
/* calculate the start and end times of this media playlist. */
if (self->files) {
GList *walk;
GstM3U8MediaFile *file;
GstClockTime duration = 0;
for (walk = self->files; walk; walk = walk->next) {
file = walk->data;
duration += file->duration;
if (file->sequence > client->highest_sequence_number) {
if (client->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 */
client->last_file_end +=
(file->sequence - client->highest_sequence_number -
1) * self->targetduration;
}
client->last_file_end += file->duration;
client->highest_sequence_number = file->sequence;
}
}
if (GST_M3U8_CLIENT_IS_LIVE (client)) {
client->first_file_start = client->last_file_end - duration;
GST_DEBUG ("Live playlist range %" GST_TIME_FORMAT " -> %"
GST_TIME_FORMAT, GST_TIME_ARGS (client->first_file_start),
GST_TIME_ARGS (client->last_file_end));
}
client->duration = duration;
}
return TRUE;
}
GstM3U8Client *
gst_m3u8_client_new (const gchar * uri, const gchar * base_uri)
{
GstM3U8Client *client;
g_return_val_if_fail (uri != NULL, NULL);
client = g_new0 (GstM3U8Client, 1);
client->main = gst_m3u8_new ();
client->current = NULL;
client->current_file = NULL;
client->sequence = -1;
client->sequence_position = 0;
client->update_failed_count = 0;
client->highest_sequence_number = -1;
client->duration = GST_CLOCK_TIME_NONE;
g_mutex_init (&client->lock);
gst_m3u8_set_uri (client->main, g_strdup (uri), g_strdup (base_uri), NULL);
return client;
}
void
gst_m3u8_client_free (GstM3U8Client * self)
{
g_return_if_fail (self != NULL);
gst_m3u8_free (self->main);
g_mutex_clear (&self->lock);
g_free (self);
}
void
gst_m3u8_client_set_current (GstM3U8Client * self, GstM3U8 * m3u8)
{
g_return_if_fail (self != NULL);
GST_M3U8_CLIENT_LOCK (self);
if (m3u8 != self->current) {
self->current = m3u8;
self->update_failed_count = 0;
self->duration = GST_CLOCK_TIME_NONE;
self->current_file = NULL;
}
GST_M3U8_CLIENT_UNLOCK (self);
}
gboolean
gst_m3u8_client_update (GstM3U8Client * self, gchar * data)
{
GstM3U8 *m3u8;
gboolean updated = FALSE;
gboolean ret = FALSE;
g_return_val_if_fail (self != NULL, FALSE);
GST_M3U8_CLIENT_LOCK (self);
m3u8 = self->current ? self->current : self->main;
if (!gst_m3u8_update (self, m3u8, data, &updated))
goto out;
if (!updated) {
self->update_failed_count++;
goto out;
}
if (self->current && !self->current->files) {
GST_ERROR ("Invalid media playlist, it does not contain any media files");
goto out;
}
/* select the first playlist, for now */
if (!self->current) {
if (self->main->lists) {
self->current = self->main->current_variant->data;
} else {
self->current = self->main;
}
}
if (m3u8->files && self->sequence == -1) {
self->current_file = g_list_first (m3u8->files);
if (GST_M3U8_CLIENT_IS_LIVE (self)) {
/* 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;
self->sequence =
GST_M3U8_MEDIA_FILE (g_list_nth_data (m3u8->files,
pos >= 0 ? pos : 0))->sequence;
} else
self->sequence = GST_M3U8_MEDIA_FILE (self->current_file->data)->sequence;
self->sequence_position = 0;
GST_DEBUG ("Setting first sequence at %u", (guint) self->sequence);
}
ret = TRUE;
out:
GST_M3U8_CLIENT_UNLOCK (self);
return ret;
}
static gint
_find_m3u8_list_match (const GstM3U8 * a, const GstM3U8 * b)
{
if (g_strcmp0 (a->name, b->name) == 0 &&
a->bandwidth == b->bandwidth &&
a->program_id == b->program_id &&
g_strcmp0 (a->codecs, b->codecs) == 0 &&
a->width == b->width &&
a->height == b->height && a->iframe == b->iframe) {
return 0;
}
return 1;
}
gboolean
gst_m3u8_client_update_variant_playlist (GstM3U8Client * self, gchar * data,
const gchar * uri, const gchar * base_uri)
{
gboolean ret = FALSE;
GList *list_entry, *unmatched_lists;
GstM3U8Client *new_client;
GstM3U8 *old;
g_return_val_if_fail (self != NULL, FALSE);
new_client = gst_m3u8_client_new (uri, base_uri);
if (gst_m3u8_client_update (new_client, data)) {
if (!new_client->main->lists) {
GST_ERROR
("Cannot update variant playlist: New playlist is not a variant playlist");
gst_m3u8_client_free (new_client);
return FALSE;
}
GST_M3U8_CLIENT_LOCK (self);
if (!self->main->lists) {
GST_ERROR
("Cannot update variant playlist: Current playlist is not a variant playlist");
goto out;
}
/* Now see if the variant playlist still has the same lists */
unmatched_lists = g_list_copy (self->main->lists);
for (list_entry = new_client->main->lists; list_entry;
list_entry = list_entry->next) {
GList *match = g_list_find_custom (unmatched_lists, list_entry->data,
(GCompareFunc) _find_m3u8_list_match);
if (match)
unmatched_lists = g_list_remove_link (unmatched_lists, match);
}
if (unmatched_lists != NULL) {
g_list_free (unmatched_lists);
/* We should attempt to handle the case where playlists are dropped/replaced,
* and possibly switch over to a comparable (not neccessarily identical)
* playlist.
*/
GST_FIXME
("Cannot update variant playlist, unable to match all playlists");
goto out;
}
/* Switch out the variant playlist */
old = self->main;
self->main = gst_m3u8_copy (new_client->main);
if (self->main->lists)
self->current = self->main->current_variant->data;
else
self->current = self->main;
gst_m3u8_free (old);
ret = TRUE;
out:
GST_M3U8_CLIENT_UNLOCK (self);
}
gst_m3u8_client_free (new_client);
return ret;
}
static gboolean
_find_current (GstM3U8MediaFile * file, GstM3U8Client * client)
{
return file->sequence != client->sequence;
}
static GList *
find_next_fragment (GstM3U8Client * client, GList * l, gboolean forward)
{
GstM3U8MediaFile *file;
if (forward) {
while (l) {
file = l->data;
if (file->sequence >= client->sequence)
break;
l = l->next;
}
} else {
l = g_list_last (l);
while (l) {
file = l->data;
if (file->sequence <= client->sequence)
break;
l = l->prev;
}
}
return l;
}
static gboolean
has_next_fragment (GstM3U8Client * client, GList * l, gboolean forward)
{
l = find_next_fragment (client, l, forward);
if (l) {
return (forward && l->next) || (!forward && l->prev);
}
return FALSE;
}
gboolean
gst_m3u8_client_get_next_fragment (GstM3U8Client * client,
gboolean * discontinuity, gchar ** uri, GstClockTime * duration,
GstClockTime * timestamp, gint64 * range_start, gint64 * range_end,
gchar ** key, guint8 ** iv, gboolean forward)
{
GstM3U8MediaFile *file;
g_return_val_if_fail (client != NULL, FALSE);
g_return_val_if_fail (client->current != NULL, FALSE);
GST_M3U8_CLIENT_LOCK (client);
GST_DEBUG ("Looking for fragment %" G_GINT64_FORMAT, client->sequence);
if (client->sequence < 0) {
GST_M3U8_CLIENT_UNLOCK (client);
return FALSE;
}
if (!client->current_file) {
client->current_file =
find_next_fragment (client, client->current->files, forward);
}
if (!client->current_file) {
GST_M3U8_CLIENT_UNLOCK (client);
return FALSE;
}
file = GST_M3U8_MEDIA_FILE (client->current_file->data);
GST_DEBUG ("Got fragment with sequence %u (client sequence %u)",
(guint) file->sequence, (guint) client->sequence);
if (timestamp)
*timestamp = client->sequence_position;
if (discontinuity)
*discontinuity = client->sequence != file->sequence || file->discont;
if (uri)
*uri = g_strdup (file->uri);
if (duration)
*duration = file->duration;
if (range_start)
*range_start = file->offset;
if (range_end)
*range_end = file->size != -1 ? file->offset + file->size - 1 : -1;
if (key)
*key = g_strdup (file->key);
if (iv) {
*iv = g_new (guint8, sizeof (file->iv));
memcpy (*iv, file->iv, sizeof (file->iv));
}
client->sequence = file->sequence;
GST_M3U8_CLIENT_UNLOCK (client);
return TRUE;
}
gboolean
gst_m3u8_client_has_next_fragment (GstM3U8Client * client, gboolean forward)
{
gboolean ret;
g_return_val_if_fail (client != NULL, FALSE);
g_return_val_if_fail (client->current != NULL, FALSE);
GST_M3U8_CLIENT_LOCK (client);
GST_DEBUG ("Checking if has next fragment %" G_GINT64_FORMAT,
client->sequence + (forward ? 1 : -1));
if (client->current_file) {
ret =
(forward ? client->current_file->next : client->current_file->prev) !=
NULL;
} else {
ret = has_next_fragment (client, client->current->files, forward);
}
GST_M3U8_CLIENT_UNLOCK (client);
return ret;
}
void
gst_m3u8_client_advance_fragment (GstM3U8Client * client, gboolean forward)
{
GstM3U8MediaFile *file;
g_return_if_fail (client != NULL);
g_return_if_fail (client->current != NULL);
GST_M3U8_CLIENT_LOCK (client);
if (!client->current_file) {
GList *l;
GST_DEBUG ("Looking for fragment %" G_GINT64_FORMAT, client->sequence);
l = g_list_find_custom (client->current->files, client,
(GCompareFunc) _find_current);
if (l == NULL) {
GST_ERROR ("Could not find current fragment");
GST_M3U8_CLIENT_UNLOCK (client);
return;
}
client->current_file = l;
}
file = GST_M3U8_MEDIA_FILE (client->current_file->data);
GST_DEBUG ("Advancing from sequence %u", (guint) file->sequence);
if (forward) {
client->current_file = client->current_file->next;
if (client->current_file) {
client->sequence =
GST_M3U8_MEDIA_FILE (client->current_file->data)->sequence;
} else {
client->sequence = file->sequence + 1;
}
client->sequence_position += file->duration;
} else {
client->current_file = client->current_file->prev;
if (client->current_file) {
client->sequence =
GST_M3U8_MEDIA_FILE (client->current_file->data)->sequence;
} else {
client->sequence = file->sequence - 1;
}
if (client->sequence_position > file->duration)
client->sequence_position -= file->duration;
else
client->sequence_position = 0;
}
GST_M3U8_CLIENT_UNLOCK (client);
}
static void
_sum_duration (GstM3U8MediaFile * self, GstClockTime * duration)
{
*duration += self->duration;
}
GstClockTime
gst_m3u8_client_get_duration (GstM3U8Client * client)
{
GstClockTime duration = GST_CLOCK_TIME_NONE;
g_return_val_if_fail (client != NULL, GST_CLOCK_TIME_NONE);
GST_M3U8_CLIENT_LOCK (client);
/* We can only get the duration for on-demand streams */
if (!client->current || !client->current->endlist) {
GST_M3U8_CLIENT_UNLOCK (client);
return GST_CLOCK_TIME_NONE;
}
if (!GST_CLOCK_TIME_IS_VALID (client->duration) && client->current->files) {
client->duration = 0;
g_list_foreach (client->current->files, (GFunc) _sum_duration,
&client->duration);
}
duration = client->duration;
GST_M3U8_CLIENT_UNLOCK (client);
return duration;
}
GstClockTime
gst_m3u8_client_get_target_duration (GstM3U8Client * client)
{
GstClockTime duration = 0;
g_return_val_if_fail (client != NULL, GST_CLOCK_TIME_NONE);
GST_M3U8_CLIENT_LOCK (client);
duration = client->current->targetduration;
GST_M3U8_CLIENT_UNLOCK (client);
return duration;
}
gchar *
gst_m3u8_client_get_uri (GstM3U8Client * client)
{
gchar *uri;
g_return_val_if_fail (client != NULL, NULL);
GST_M3U8_CLIENT_LOCK (client);
uri = client->main ? g_strdup (client->main->uri) : NULL;
GST_M3U8_CLIENT_UNLOCK (client);
return uri;
}
gchar *
gst_m3u8_client_get_current_uri (GstM3U8Client * client)
{
gchar *uri;
g_return_val_if_fail (client != NULL, NULL);
GST_M3U8_CLIENT_LOCK (client);
uri = g_strdup (client->current->uri);
GST_M3U8_CLIENT_UNLOCK (client);
return uri;
}
gboolean
gst_m3u8_client_has_main (GstM3U8Client * client)
{
gboolean ret;
g_return_val_if_fail (client != NULL, FALSE);
GST_M3U8_CLIENT_LOCK (client);
if (client->main)
ret = TRUE;
else
ret = FALSE;
GST_M3U8_CLIENT_UNLOCK (client);
return ret;
}
gboolean
gst_m3u8_client_has_variant_playlist (GstM3U8Client * client)
{
gboolean ret;
g_return_val_if_fail (client != NULL, FALSE);
GST_M3U8_CLIENT_LOCK (client);
ret = (client->main->lists != NULL);
GST_M3U8_CLIENT_UNLOCK (client);
return ret;
}
gboolean
gst_m3u8_client_is_live (GstM3U8Client * client)
{
gboolean ret;
g_return_val_if_fail (client != NULL, FALSE);
GST_M3U8_CLIENT_LOCK (client);
ret = GST_M3U8_CLIENT_IS_LIVE (client);
GST_M3U8_CLIENT_UNLOCK (client);
return ret;
}
GList *
gst_m3u8_client_get_playlist_for_bitrate (GstM3U8Client * client, guint bitrate)
{
GList *list, *current_variant;
GST_M3U8_CLIENT_LOCK (client);
current_variant = client->main->current_variant;
/* Go to the highest possible bandwidth allowed */
while (GST_M3U8 (current_variant->data)->bandwidth <= bitrate) {
list = g_list_next (current_variant);
if (!list)
break;
current_variant = list;
}
while (GST_M3U8 (current_variant->data)->bandwidth > bitrate) {
list = g_list_previous (current_variant);
if (!list)
break;
current_variant = list;
}
GST_M3U8_CLIENT_UNLOCK (client);
return current_variant;
}
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;
}
guint64
gst_m3u8_client_get_current_fragment_duration (GstM3U8Client * client)
{
guint64 dur;
GList *list;
g_return_val_if_fail (client != NULL, 0);
GST_M3U8_CLIENT_LOCK (client);
list = g_list_find_custom (client->current->files, client,
(GCompareFunc) _find_current);
if (list == NULL) {
dur = -1;
} else {
dur = GST_M3U8_MEDIA_FILE (list->data)->duration;
}
GST_M3U8_CLIENT_UNLOCK (client);
return dur;
}
gboolean
gst_m3u8_client_get_seek_range (GstM3U8Client * client, gint64 * start,
gint64 * stop)
{
GstClockTime duration = 0;
GList *walk;
GstM3U8MediaFile *file;
guint count;
g_return_val_if_fail (client != NULL, FALSE);
GST_M3U8_CLIENT_LOCK (client);
if (client->current == NULL || client->current->files == NULL) {
GST_M3U8_CLIENT_UNLOCK (client);
return FALSE;
}
count = g_list_length (client->current->files);
/* count is used to make sure the seek range is never closer than
GST_M3U8_LIVE_MIN_FRAGMENT_DISTANCE fragments from the end of the
playlist - see 6.3.3. "Playing the Playlist file" of the HLS draft */
for (walk = client->current->files;
walk && count >= GST_M3U8_LIVE_MIN_FRAGMENT_DISTANCE; walk = walk->next) {
file = walk->data;
--count;
duration += file->duration;
}
if (duration <= 0) {
GST_M3U8_CLIENT_UNLOCK (client);
return FALSE;
}
*start = client->first_file_start;
*stop = *start + duration;
GST_M3U8_CLIENT_UNLOCK (client);
return TRUE;
}
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