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gstreamer/ext/hls/m3u8.c
Sebastian Dröge 821320fbc4 hlsdemux: Resync live playlists to the 3rd newest fragment if we fall off the playlist 
As HLS does not provide any way of knowing the server's clock, and we do
buffering of "live" streams, at some point we will fall behind the server in
many cases and would have to advance to a fragment that is not in the playlist
anymore.

Previously we would've just resynced to the next oldest fragment that is still
there, but this causes problems as from this point onwards we would always
fall off the playlist again all the time.
Instead we now resync and move to the 3rd newest fragment like we would do
when starting playback of a live stream.

https://bugzilla.gnome.org/show_bug.cgi?id=758987
2015-12-04 18:06:30 +02:00

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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 "gsthls.h"
#include "m3u8.h"
#define GST_CAT_DEFAULT hls_debug
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 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;
gint64 mediasequence;
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;
}
GST_TRACE ("data:\n%s", data);
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;
mediasequence = 0;
/* 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, 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, "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->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);
}
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))
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->current_file_duration = GST_CLOCK_TIME_NONE;
client->sequence = -1;
client->sequence_position = 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->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)
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) {
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->current_file = g_list_nth (m3u8->files, pos >= 0 ? pos : 0);
} else {
self->current_file = g_list_first (m3u8->files);
}
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_delete_link (unmatched_lists, match);
}
if (unmatched_lists != NULL) {
GST_WARNING ("Unable to match all playlists");
for (list_entry = unmatched_lists; list_entry;
list_entry = list_entry->next) {
if (list_entry->data == self->current) {
GST_WARNING ("Unable to match current playlist");
}
}
g_list_free (unmatched_lists);
}
/* Switch out the variant playlist, steal it from new_client */
old = self->main;
self->main = new_client->main;
new_client->main = gst_m3u8_new ();
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 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);
client->current_file_duration = file->duration;
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;
}
static void
alternate_advance (GstM3U8Client * client, gboolean forward)
{
gint targetnum = client->sequence;
GList *tmp;
GstM3U8MediaFile *mf;
/* figure out the target seqnum */
if (forward)
targetnum += 1;
else
targetnum -= 1;
for (tmp = client->current->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;
}
client->current_file = tmp;
client->sequence = targetnum;
client->current_file_duration =
GST_M3U8_MEDIA_FILE (client->current_file->data)->duration;
}
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);
GST_DEBUG ("Sequence position was %" GST_TIME_FORMAT,
GST_TIME_ARGS (client->sequence_position));
if (GST_CLOCK_TIME_IS_VALID (client->current_file_duration)) {
/* Advance our position based on the previous fragment we played */
if (forward)
client->sequence_position += client->current_file_duration;
else if (client->current_file_duration < client->sequence_position)
client->sequence_position -= client->current_file_duration;
else
client->sequence_position = 0;
client->current_file_duration = GST_CLOCK_TIME_NONE;
GST_DEBUG ("Sequence position now %" GST_TIME_FORMAT,
GST_TIME_ARGS (client->sequence_position));
}
if (!client->current_file) {
GList *l;
GST_DEBUG ("Looking for fragment %" G_GINT64_FORMAT, client->sequence);
for (l = client->current->files; l != NULL; l = l->next) {
if (GST_M3U8_MEDIA_FILE (l->data)->sequence == client->sequence) {
client->current_file = l;
break;
}
}
if (client->current_file == NULL) {
GST_DEBUG
("Could not find current fragment, trying next fragment directly");
alternate_advance (client, forward);
/* Resync sequence number if the above has failed for live streams */
if (client->current_file == NULL && GST_M3U8_CLIENT_IS_LIVE (client)) {
/* 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 (client->current->files) -
GST_M3U8_LIVE_MIN_FRAGMENT_DISTANCE;
client->current_file =
g_list_nth (client->current->files, pos >= 0 ? pos : 0);
client->current_file_duration =
GST_M3U8_MEDIA_FILE (client->current_file->data)->duration;
GST_WARNING ("Resyncing live playlist");
}
GST_M3U8_CLIENT_UNLOCK (client);
return;
}
}
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;
}
} 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->current_file) {
/* Store duration of the fragment we're using to update the position
* the next time we advance */
client->current_file_duration =
GST_M3U8_MEDIA_FILE (client->current_file->data)->duration;
}
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_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;
}
gboolean
gst_m3u8_client_get_seek_range (GstM3U8Client * client, gint64 * start,
gint64 * stop)
{
GstClockTime duration = 0;
GList *walk;
GstM3U8MediaFile *file;
guint count;
guint min_distance = 0;
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;
}
if (GST_M3U8_CLIENT_IS_LIVE (client)) {
/* 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 (client->current->files);
for (walk = client->current->files;
walk && count >= min_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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