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audio: fix clicks in sample decoding

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Resolves #2846.
This commit is contained in:
Marcin Kurczewski 2025-04-26 16:38:55 +02:00
parent 7a483b8455
commit 8a93f6de02
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GPG key ID: CC65E6FD28CAE42A
1 changed files with 33 additions and 18 deletions
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51
src/libtrx/engine/audio_sample.c
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@ -148,34 +148,49 @@ static int64_t M_SeekAVBuffer(void *opaque, int64_t offset, int32_t whence)
static int32_t M_OutputAudioFrame(
M_SWR_CONTEXT *const swr, AVFrame *const frame)
{
// Determine the maximum number of output samples this call can produce,
// based on the current delay already inside the resampler plus the new
// input. Using av_rescale_rnd() keeps everything in integer domain and
// avoids cumulative rounding errors.
const int64_t delay = swr_get_delay(swr->ctx, swr->src.sample_rate);
const int32_t out_samples = (int32_t)av_rescale_rnd(
delay + frame->nb_samples, swr->dst.sample_rate, swr->src.sample_rate,
AV_ROUND_UP);
if (out_samples <= 0) {
return 0; // nothing to do
}
uint8_t *out_buffer = nullptr;
const int32_t out_samples =
swr_get_out_samples(swr->ctx, frame->nb_samples);
av_samples_alloc(
&out_buffer, nullptr, swr->dst.ch_layout.nb_channels, out_samples,
swr->dst.format, 1);
int32_t resampled_size = swr_convert(
if (av_samples_alloc(
&out_buffer, nullptr, swr->dst.ch_layout.nb_channels, out_samples,
swr->dst.format, 1)
< 0) {
return AVERROR(ENOMEM);
}
// Convert – we do *not* drain the resampler here.
const int32_t converted = swr_convert(
swr->ctx, &out_buffer, out_samples, (const uint8_t **)frame->data,
frame->nb_samples);
while (resampled_size > 0) {
int32_t out_buffer_size = av_samples_get_buffer_size(
nullptr, swr->dst.ch_layout.nb_channels, resampled_size,
swr->dst.format, 1);
if (converted < 0) {
av_freep(&out_buffer);
return converted; // propagate error
}
if (converted > 0) {
const int32_t out_buffer_size = av_samples_get_buffer_size(
nullptr, swr->dst.ch_layout.nb_channels, converted, swr->dst.format,
1);
if (out_buffer_size > 0) {
swr->working_buffer = Memory_Realloc(
swr->working_buffer,
swr->working_buffer_size + out_buffer_size);
if (out_buffer) {
memcpy(
swr->working_buffer + swr->working_buffer_size, out_buffer,
out_buffer_size);
}
memcpy(
swr->working_buffer + swr->working_buffer_size, out_buffer,
out_buffer_size);
swr->working_buffer_size += out_buffer_size;
}
resampled_size =
swr_convert(swr->ctx, &out_buffer, out_samples, nullptr, 0);
}
av_freep(&out_buffer);