add ffmpeg audio pts tolerance, update plugin info

[goodguy/history.git] / cinelerra-5.1 / cinelerra / ffmpeg.C

diff --git a/cinelerra-5.1/cinelerra/ffmpeg.C b/cinelerra-5.1/cinelerra/ffmpeg.C
index a18ae88cae0e356847edad989b3935752b008b79..65e0c780e793cfaa82b04cd3860cafbe8cb98066 100644 (file)
--- a/cinelerra-5.1/cinelerra/ffmpeg.C
+++ b/cinelerra-5.1/cinelerra/ffmpeg.C
@@ -15,6 +15,8 @@
 #define INT64_MAX 9223372036854775807LL
 #endif
 #define MAX_RETRY 1000
+// max pts/curr_pos drift allowed before correction (in seconds)
+#define AUDIO_PTS_TOLERANCE 0.04
 
 #include "asset.h"
 #include "bccmodels.h"
@@ -758,6 +760,7 @@ int FFAudioStream::load_history(uint8_t **data, int len)
 int FFAudioStream::decode_frame(AVFrame *frame)
 {
        int first_frame = seeked;  seeked = 0;
+       frame->best_effort_timestamp = AV_NOPTS_VALUE;
        int ret = avcodec_receive_frame(avctx, frame);
        if( ret < 0 ) {
                if( first_frame || ret == AVERROR(EAGAIN) ) return 0;
@@ -766,8 +769,13 @@ int FFAudioStream::decode_frame(AVFrame *frame)
                return -1;
        }
        int64_t pkt_ts = frame->best_effort_timestamp;
-       if( pkt_ts != AV_NOPTS_VALUE )
-               curr_pos = ffmpeg->to_secs(pkt_ts - nudge, st->time_base) * sample_rate + 0.5;
+       if( pkt_ts != AV_NOPTS_VALUE ) {
+               double ts = ffmpeg->to_secs(pkt_ts - nudge, st->time_base);
+               double t = (double)curr_pos / sample_rate;
+// some time_base clocks are very grainy, too grainy for audio (clicks, pops)
+               if( fabs(ts - t) > AUDIO_PTS_TOLERANCE )
+                       curr_pos = ts * sample_rate + 0.5;
+       }
        return 1;
 }
 
@@ -845,7 +853,8 @@ int FFAudioStream::audio_seek(int64_t pos)
        if( pos == curr_pos ) return 0;
        reset_history();  mbsz = 0;
 // guarentee preload > 1sec samples
-       if( seek(pos-sample_rate, sample_rate) < 0 ) return -1;
+       if( (pos-=sample_rate) < 0 ) pos = 0;
+       if( seek(pos, sample_rate) < 0 ) return -1;
        return 1;
 }