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libobs: Fix another sync issue with encoder sharing

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If audio buffering is very high, the audio packets built up in the
interleaved buffer would be significantly before the first video packet,
causing the offset between the starting video/audio packet pairs to be
significantly off, leading to desync.

This issue was not spotted until recently because it only happens when
streaming/recording with same encoders while audio buffering is very
high.
This commit is contained in:
jp9000 2016-04-18 14:02:57 -07:00
parent bef1b37ae2
commit cbd13063c6
1 changed files with 40 additions and 0 deletions
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40
libobs/obs-output.c
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@ -1039,6 +1039,26 @@ static int find_first_packet_type_idx(struct obs_output *output,
return -1;
}
static int find_last_packet_type_idx(struct obs_output *output,
enum obs_encoder_type type, size_t audio_idx)
{
for (size_t i = output->interleaved_packets.num; i > 0; i--) {
struct encoder_packet *packet =
&output->interleaved_packets.array[i - 1];
if (packet->type == type) {
if (type == OBS_ENCODER_AUDIO &&
packet->track_idx != audio_idx) {
continue;
}
return (int)(i - 1);
}
}
return -1;
}
static inline struct encoder_packet *find_first_packet_type(
struct obs_output *output, enum obs_encoder_type type,
size_t audio_idx)
@ -1047,10 +1067,19 @@ static inline struct encoder_packet *find_first_packet_type(
return (idx != -1) ? &output->interleaved_packets.array[idx] : NULL;
}
static inline struct encoder_packet *find_last_packet_type(
struct obs_output *output, enum obs_encoder_type type,
size_t audio_idx)
{
int idx = find_last_packet_type_idx(output, type, audio_idx);
return (idx != -1) ? &output->interleaved_packets.array[idx] : NULL;
}
static bool initialize_interleaved_packets(struct obs_output *output)
{
struct encoder_packet *video;
struct encoder_packet *audio[MAX_AUDIO_MIXES];
struct encoder_packet *last_audio[MAX_AUDIO_MIXES];
size_t audio_mixes = num_audio_mixes(output);
video = find_first_packet_type(output, OBS_ENCODER_VIDEO, 0);
@ -1063,12 +1092,23 @@ static bool initialize_interleaved_packets(struct obs_output *output)
output->received_audio = false;
return false;
}
last_audio[i] = find_last_packet_type(output, OBS_ENCODER_AUDIO,
i);
}
if (!video) {
return false;
}
/* ensure that there is audio past the first video packet */
for (size_t i = 0; i < audio_mixes; i++) {
if (last_audio[i]->dts_usec < video->dts_usec) {
output->received_audio = false;
return false;
}
}
/* get new offsets */
output->video_offset = video->dts;
for (size_t i = 0; i < audio_mixes; i++)