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avfilter/af_atempo: Make ffplay display correct timestamps when seeking 

NOTE: this is a refinement of the patch from Paul B Mahol
offset all output timestamps by same amount of first input timestamp
This commit is contained in:
Pavel Koshevoy 2019-05-07 22:39:45 -06:00
parent 48539b62fc
commit 181031906e
1 changed files with 10 additions and 1 deletions
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11
libavfilter/af_atempo.c
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@ -103,6 +103,9 @@ typedef struct ATempoContext {
// 1: output sample position
int64_t position[2];
// first input timestamp, all other timestamps are offset by this one
int64_t start_pts;
// sample format:
enum AVSampleFormat format;
@ -186,6 +189,7 @@ static void yae_clear(ATempoContext *atempo)
atempo->nfrag = 0;
atempo->state = YAE_LOAD_FRAGMENT;
atempo->start_pts = AV_NOPTS_VALUE;
atempo->position[0] = 0;
atempo->position[1] = 0;
@ -1068,7 +1072,7 @@ static int push_samples(ATempoContext *atempo,
atempo->dst_buffer->nb_samples = n_out;
// adjust the PTS:
atempo->dst_buffer->pts =
atempo->dst_buffer->pts = atempo->start_pts +
av_rescale_q(atempo->nsamples_out,
(AVRational){ 1, outlink->sample_rate },
outlink->time_base);
@ -1097,6 +1101,11 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *src_buffer)
const uint8_t *src = src_buffer->data[0];
const uint8_t *src_end = src + n_in * atempo->stride;
if (atempo->start_pts == AV_NOPTS_VALUE)
atempo->start_pts = av_rescale_q(src_buffer->pts,
inlink->time_base,
outlink->time_base);
while (src < src_end) {
if (!atempo->dst_buffer) {
atempo->dst_buffer = ff_get_audio_buffer(outlink, n_out);