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avfilter/f_loop: fix aloop activate logic

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The logic did not follow the documented behaviour and that caused skipping of
some audio in the loop and in the leftover buffer.

Example command line which should produce a smooth sine wave for the whole
duration of the output:

ffmpeg -f lavfi -i "sine=r=48000:f=480:d=4" -af "aloop=loop=4:start=48000:size=48000" out.wav

Fixes ticket #11283.

Signed-off-by: Marton Balint <cus@passwd.hu>
(cherry picked from commit fe18ed3f2a9221af0beaec7b04b7804849db1f2f)
This commit is contained in:
Marton Balint 2024-11-04 00:43:06 +01:00
parent 2b6be6ba90
commit a6a07eebdf
1 changed files with 28 additions and 42 deletions
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70
libavfilter/f_loop.c
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@ -21,6 +21,7 @@
#include "config_components.h"
#include "libavutil/audio_fifo.h"
#include "libavutil/avassert.h"
#include "libavutil/internal.h"
#include "libavutil/opt.h"
#include "avfilter.h"
@ -104,7 +105,7 @@ static av_cold void auninit(AVFilterContext *ctx)
av_audio_fifo_free(s->left);
}
static int push_samples(AVFilterContext *ctx, int nb_samples)
static int push_samples(AVFilterContext *ctx, int nb_samples, AVFrame **frame)
{
AVFilterLink *outlink = ctx->outputs[0];
LoopContext *s = ctx->priv;
@ -126,9 +127,7 @@ static int push_samples(AVFilterContext *ctx, int nb_samples)
i += out->nb_samples;
s->current_sample += out->nb_samples;
ret = ff_filter_frame(outlink, out);
if (ret < 0)
return ret;
*frame = out;
if (s->current_sample >= s->nb_samples) {
s->current_sample = 0;
@ -136,6 +135,8 @@ static int push_samples(AVFilterContext *ctx, int nb_samples)
if (s->loop > 0)
s->loop--;
}
return 0;
}
return ret;
@ -181,10 +182,7 @@ static int afilter_frame(AVFilterLink *inlink, AVFrame *frame)
s->pts += av_rescale_q(ret, (AVRational){1, outlink->sample_rate}, outlink->time_base);
ret = ff_filter_frame(outlink, frame);
} else {
int nb_samples = frame->nb_samples;
av_frame_free(&frame);
ret = push_samples(ctx, nb_samples);
av_assert0(0);
}
} else {
s->ignored_samples += frame->nb_samples;
@ -196,7 +194,7 @@ static int afilter_frame(AVFilterLink *inlink, AVFrame *frame)
return ret;
}
static int arequest_frame(AVFilterLink *outlink)
static int arequest_frame(AVFilterLink *outlink, AVFrame **frame)
{
AVFilterContext *ctx = outlink->src;
LoopContext *s = ctx->priv;
@ -216,17 +214,11 @@ static int arequest_frame(AVFilterLink *outlink)
av_audio_fifo_read(s->left, (void **)out->extended_data, nb_samples);
out->pts = s->pts;
s->pts += av_rescale_q(nb_samples, (AVRational){1, outlink->sample_rate}, outlink->time_base);
ret = ff_filter_frame(outlink, out);
if (ret < 0)
return ret;
*frame = out;
}
ret = ff_request_frame(ctx->inputs[0]);
return 0;
} else {
ret = push_samples(ctx, 1024);
}
if (s->eof && s->nb_samples > 0 && s->loop != 0) {
ret = push_samples(ctx, 1024);
ret = push_samples(ctx, 1024, frame);
}
return ret;
@ -244,37 +236,31 @@ static int aactivate(AVFilterContext *ctx)
update_time(ctx, inlink->time_base);
if (!s->eof && (s->nb_samples < s->size || !s->loop || !s->size)) {
const int in_nb_samples = FFMIN(1024, s->size - s->nb_samples);
if (in_nb_samples == 0)
ret = ff_inlink_consume_frame(inlink, &frame);
else
ret = ff_inlink_consume_samples(inlink, in_nb_samples, in_nb_samples, &frame);
if (ret < 0)
return ret;
if (ret > 0)
return afilter_frame(inlink, frame);
}
retry:
ret = arequest_frame(outlink, &frame);
if (ret < 0)
return ret;
if (frame)
return ff_filter_frame(outlink, frame);
if (!s->eof && ff_inlink_acknowledge_status(inlink, &status, &s->eof_pts)) {
if (status == AVERROR_EOF) {
ret = ff_inlink_consume_frame(inlink, &frame);
if (ret < 0)
return ret;
if (ret > 0)
return afilter_frame(inlink, frame);
ret = ff_inlink_acknowledge_status(inlink, &status, &s->eof_pts);
if (ret) {
if (status == AVERROR_EOF && !s->eof) {
s->size = s->nb_samples;
s->eof = 1;
goto retry;
}
}
if (s->eof && (!s->loop || !s->size)) {
ff_outlink_set_status(outlink, AVERROR_EOF, s->eof_pts + s->pts_offset);
ff_outlink_set_status(outlink, status, s->eof_pts);
return 0;
}
if (!s->eof && (!s->size ||
(s->nb_samples < s->size) ||
(s->nb_samples >= s->size && s->loop == 0))) {
FF_FILTER_FORWARD_WANTED(outlink, inlink);
} else if (s->loop && s->nb_samples == s->size) {
return arequest_frame(outlink);
}
FF_FILTER_FORWARD_WANTED(outlink, inlink);
return FFERROR_NOT_READY;
}