diff options
Diffstat (limited to 'libavfilter/af_resample.c')
| -rw-r--r-- | libavfilter/af_resample.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/libavfilter/af_resample.c b/libavfilter/af_resample.c index bc8fd8a731..a59e6f8fd1 100644 --- a/libavfilter/af_resample.c +++ b/libavfilter/af_resample.c @@ -42,6 +42,7 @@ typedef struct ResampleContext { AVDictionary *options; int64_t next_pts; + int64_t next_in_pts; /* set by filter_frame() to signal an output frame to request_frame() */ int got_output; @@ -154,6 +155,7 @@ static int config_output(AVFilterLink *outlink) outlink->time_base = (AVRational){ 1, outlink->sample_rate }; s->next_pts = AV_NOPTS_VALUE; + s->next_in_pts = AV_NOPTS_VALUE; av_get_channel_layout_string(buf1, sizeof(buf1), -1, inlink ->channel_layout); @@ -255,7 +257,12 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in) } out->sample_rate = outlink->sample_rate; - if (in->pts != AV_NOPTS_VALUE) { + /* Only convert in->pts if there is a discontinuous jump. + This ensures that out->pts tracks the number of samples actually + output by the resampler in the absence of such a jump. + Otherwise, the rounding in av_rescale_q() and av_rescale() + causes off-by-1 errors. */ + if (in->pts != AV_NOPTS_VALUE && in->pts != s->next_in_pts) { out->pts = av_rescale_q(in->pts, inlink->time_base, outlink->time_base) - av_rescale(delay, outlink->sample_rate, @@ -264,6 +271,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in) out->pts = s->next_pts; s->next_pts = out->pts + out->nb_samples; + s->next_in_pts = in->pts + in->nb_samples; ret = ff_filter_frame(outlink, out); s->got_output = 1; |