X-Git-Url: http://git.cinelerra-gg.org/git/?p=goodguy%2Fhistory.git;a=blobdiff_plain;f=cinelerra-5.1%2Fcinelerra%2Fffmpeg.C;h=65e0c780e793cfaa82b04cd3860cafbe8cb98066;hp=a18ae88cae0e356847edad989b3935752b008b79;hb=a19a685a46ddc630010788707d9e5b9d2342af46;hpb=7e5a0760f40ff787cc3d93cb7768a901ebe52809

diff --git a/cinelerra-5.1/cinelerra/ffmpeg.C b/cinelerra-5.1/cinelerra/ffmpeg.C
index a18ae88c..65e0c780 100644
--- 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;
 }