static gboolean
gst_hls_demux_schedule (GstHLSDemux * demux)
{
gfloat update_factor;
gint count;
/* As defined in §6.3.4. Reloading the Playlist file:
* "If the client reloads a Playlist file and finds that it has not
* changed then it MUST wait for a period of time before retrying. The
* minimum delay is a multiple of the target duration. This multiple is
* 0.5 for the first attempt, 1.5 for the second, and 3.0 thereafter."
*/
count = demux->client->update_failed_count;
if (count < 3)
update_factor = update_interval_factor[count];
else
update_factor = update_interval_factor[3];
/* schedule the next update using the target duration field of the
* playlist */
g_time_val_add (&demux->next_update,
gst_m3u8_client_get_target_duration (demux->client)
/ GST_SECOND * G_USEC_PER_SEC * update_factor);
GST_DEBUG_OBJECT (demux, "Next update scheduled at %s",
g_time_val_to_iso8601 (&demux->next_update));
return TRUE;
}
static gint64
gst_hls_demux_get_manifest_update_interval (GstAdaptiveDemux * demux)
{
GstHLSDemux *hlsdemux = GST_HLS_DEMUX_CAST (demux);
return gst_util_uint64_scale (gst_m3u8_client_get_target_duration
(hlsdemux->client), G_USEC_PER_SEC, GST_SECOND);
}
static gboolean
gst_hls_demux_switch_playlist (GstHLSDemux * demux)
{
GTimeVal now;
gint64 diff, limit;
g_get_current_time (&now);
GST_M3U8_CLIENT_LOCK (demux->client);
if (!demux->client->main->lists) {
GST_M3U8_CLIENT_UNLOCK (demux->client);
return TRUE;
}
GST_M3U8_CLIENT_UNLOCK (demux->client);
/* compare the time when the fragment was downloaded with the time when it was
* scheduled */
diff = (GST_TIMEVAL_TO_TIME (demux->next_update) - GST_TIMEVAL_TO_TIME (now));
limit = gst_m3u8_client_get_target_duration (demux->client)
* demux->bitrate_switch_tol;
GST_DEBUG ("diff:%s%" GST_TIME_FORMAT ", limit:%" GST_TIME_FORMAT,
diff < 0 ? "-" : " ", GST_TIME_ARGS (ABS (diff)), GST_TIME_ARGS (limit));
/* if we are on time switch to a higher bitrate */
if (diff > limit) {
while (diff > limit) {
gst_hls_demux_change_playlist (demux, TRUE);
diff -= limit;
}
demux->accumulated_delay = 0;
} else if (diff < 0) {
/* if the client is too slow wait until it has accumulated a certain delay to
* switch to a lower bitrate */
demux->accumulated_delay -= diff;
if (demux->accumulated_delay >= limit) {
while (demux->accumulated_delay >= limit) {
gst_hls_demux_change_playlist (demux, FALSE);
demux->accumulated_delay -= limit;
}
demux->accumulated_delay = 0;
}
}
return TRUE;
}
static gboolean
gst_hls_demux_cache_fragments (GstHLSDemux * demux)
{
gint i;
/* If this playlist is a variant playlist, select the first one
* and update it */
if (gst_m3u8_client_has_variant_playlist (demux->client)) {
GstM3U8 *child = NULL;
GST_M3U8_CLIENT_LOCK (demux->client);
child = demux->client->main->current_variant->data;
GST_M3U8_CLIENT_UNLOCK (demux->client);
gst_m3u8_client_set_current (demux->client, child);
if (!gst_hls_demux_update_playlist (demux)) {
GST_ERROR_OBJECT (demux, "Could not fetch the child playlist %s",
child->uri);
return FALSE;
}
}
/* If it's a live source, set the sequence number to the end of the list
* and substract the 'fragmets_cache' to start from the last fragment*/
if (gst_m3u8_client_is_live (demux->client)) {
GST_M3U8_CLIENT_LOCK (demux->client);
demux->client->sequence += g_list_length (demux->client->current->files);
if (demux->client->sequence >= demux->fragments_cache)
demux->client->sequence -= demux->fragments_cache;
else
demux->client->sequence = 0;
gst_m3u8_client_get_current_position (demux->client, &demux->position);
GST_M3U8_CLIENT_UNLOCK (demux->client);
} else {
GstClockTime duration = gst_m3u8_client_get_duration (demux->client);
GST_DEBUG_OBJECT (demux, "Sending duration message : %" GST_TIME_FORMAT,
GST_TIME_ARGS (duration));
if (duration != GST_CLOCK_TIME_NONE)
gst_element_post_message (GST_ELEMENT (demux),
gst_message_new_duration (GST_OBJECT (demux),
GST_FORMAT_TIME, duration));
}
/* Cache the first fragments */
for (i = 0; i < demux->fragments_cache; i++) {
gst_element_post_message (GST_ELEMENT (demux),
gst_message_new_buffering (GST_OBJECT (demux),
100 * i / demux->fragments_cache));
g_get_current_time (&demux->next_update);
g_time_val_add (&demux->next_update,
gst_m3u8_client_get_target_duration (demux->client)
/ GST_SECOND * G_USEC_PER_SEC);
if (!gst_hls_demux_get_next_fragment (demux)) {
if (demux->end_of_playlist)
break;
if (!demux->cancelled)
GST_ERROR_OBJECT (demux, "Error caching the first fragments");
return FALSE;
}
/* make sure we stop caching fragments if something cancelled it */
if (demux->cancelled)
return FALSE;
gst_hls_demux_switch_playlist (demux);
}
gst_element_post_message (GST_ELEMENT (demux),
gst_message_new_buffering (GST_OBJECT (demux), 100));
g_get_current_time (&demux->next_update);
demux->need_cache = FALSE;
return TRUE;
}
