static int request_frame(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
FPSContext *s = ctx->priv;
int frames_out = s->frames_out;
int ret = 0;
while (ret >= 0 && s->frames_out == frames_out)
ret = ff_request_frame(ctx->inputs[0]);
/* flush the fifo */
if (ret == AVERROR_EOF && av_fifo_size(s->fifo)) {
int i;
for (i = 0; av_fifo_size(s->fifo); i++) {
AVFrame *buf;
av_fifo_generic_read(s->fifo, &buf, sizeof(buf), NULL);
buf->pts = av_rescale_q(s->first_pts, ctx->inputs[0]->time_base,
outlink->time_base) + s->frames_out;
if ((ret = ff_filter_frame(outlink, buf)) < 0)
return ret;
s->frames_out++;
}
return 0;
}
return ret;
}
static int interleave_new_audio_packet(AVFormatContext *s, AVPacket *pkt,
int stream_index, int flush)
{
AVStream *st = s->streams[stream_index];
AudioInterleaveContext *aic = st->priv_data;
int ret;
int size = FFMIN(av_fifo_size(aic->fifo), *aic->samples * aic->sample_size);
if (!size || (!flush && size == av_fifo_size(aic->fifo)))
return 0;
ret = av_new_packet(pkt, size);
if (ret < 0)
return ret;
av_fifo_generic_read(aic->fifo, pkt->data, size, NULL);
pkt->dts = pkt->pts = aic->dts;
pkt->duration = av_rescale_q(*aic->samples, st->time_base, aic->time_base);
pkt->stream_index = stream_index;
aic->dts += pkt->duration;
aic->samples++;
if (!*aic->samples)
aic->samples = aic->samples_per_frame;
return size;
}
int main(void)
{
/* create a FIFO buffer */
AVFifoBuffer *fifo = av_fifo_alloc(13 * sizeof(int));
int i, j, n;
/* fill data */
for (i = 0; av_fifo_space(fifo) >= sizeof(int); i++)
av_fifo_generic_write(fifo, &i, sizeof(int), NULL);
/* peek at FIFO */
n = av_fifo_size(fifo) / sizeof(int);
for (i = -n + 1; i < n; i++) {
int *v = (int *)av_fifo_peek2(fifo, i * sizeof(int));
printf("%d: %d\n", i, *v);
}
printf("\n");
/* read data */
for (i = 0; av_fifo_size(fifo) >= sizeof(int); i++) {
av_fifo_generic_read(fifo, &j, sizeof(int), NULL);
printf("%d ", j);
}
printf("\n");
av_fifo_free(fifo);
return 0;
}
static int request_frame(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
SelectContext *select = ctx->priv;
AVFilterLink *inlink = outlink->src->inputs[0];
select->select = 0;
if (av_fifo_size(select->pending_frames)) {
AVFilterBufferRef *picref;
av_fifo_generic_read(select->pending_frames, &picref, sizeof(picref), NULL);
avfilter_start_frame(outlink, avfilter_ref_buffer(picref, ~0));
avfilter_draw_slice(outlink, 0, outlink->h, 1);
avfilter_end_frame(outlink);
avfilter_unref_buffer(picref);
return 0;
}
while (!select->select) {
int ret = avfilter_request_frame(inlink);
if (ret < 0)
return ret;
}
return 0;
}
int attribute_align_arg av_buffersink_get_frame_flags(AVFilterContext *ctx, AVFrame *frame, int flags)
{
BufferSinkContext *buf = ctx->priv;
AVFilterLink *inlink = ctx->inputs[0];
int ret;
AVFrame *cur_frame;
/* no picref available, fetch it from the filterchain */
if (!av_fifo_size(buf->fifo)) {
if (flags & AV_BUFFERSINK_FLAG_NO_REQUEST)
return AVERROR(EAGAIN);
if ((ret = ff_request_frame(inlink)) < 0)
return ret;
}
if (!av_fifo_size(buf->fifo))
return AVERROR(EINVAL);
if (flags & AV_BUFFERSINK_FLAG_PEEK) {
cur_frame = *((AVFrame **)av_fifo_peek2(buf->fifo, 0));
if ((ret = av_frame_ref(frame, cur_frame)) < 0)
return ret;
} else {
av_fifo_generic_read(buf->fifo, &cur_frame, sizeof(cur_frame), NULL);
av_frame_move_ref(frame, cur_frame);
av_frame_free(&cur_frame);
}
return 0;
}
static void flush_fifo(AVFifoBuffer *fifo)
{
while (av_fifo_size(fifo)) {
AVFrame *tmp;
av_fifo_generic_read(fifo, &tmp, sizeof(tmp), NULL);
av_frame_free(&tmp);
}
}
status_t
AVCodecEncoder::_EncodeAudio(const void* _buffer, int64 frameCount,
media_encode_info* info)
{
TRACE("AVCodecEncoder::_EncodeAudio(%p, %lld, %p)\n", _buffer, frameCount,
info);
if (fChunkBuffer == NULL)
return B_NO_MEMORY;
status_t ret = B_OK;
const uint8* buffer = reinterpret_cast<const uint8*>(_buffer);
size_t inputSampleSize = fInputFormat.u.raw_audio.format
& media_raw_audio_format::B_AUDIO_SIZE_MASK;
size_t inputFrameSize = inputSampleSize
* fInputFormat.u.raw_audio.channel_count;
size_t bufferSize = frameCount * inputFrameSize;
bufferSize = min_c(bufferSize, kDefaultChunkBufferSize);
if (fContext->frame_size > 1) {
// Encoded audio. Things work differently from raw audio. We need
// the fAudioFifo to pipe data.
if (av_fifo_realloc2(fAudioFifo,
av_fifo_size(fAudioFifo) + bufferSize) < 0) {
TRACE(" av_fifo_realloc2() failed\n");
return B_NO_MEMORY;
}
av_fifo_generic_write(fAudioFifo, const_cast<uint8*>(buffer),
bufferSize, NULL);
int frameBytes = fContext->frame_size * inputFrameSize;
uint8* tempBuffer = new(std::nothrow) uint8[frameBytes];
if (tempBuffer == NULL)
return B_NO_MEMORY;
// Encode as many chunks as can be read from the FIFO.
while (av_fifo_size(fAudioFifo) >= frameBytes) {
av_fifo_generic_read(fAudioFifo, tempBuffer, frameBytes, NULL);
ret = _EncodeAudio(tempBuffer, frameBytes, fContext->frame_size,
info);
if (ret != B_OK)
break;
}
delete[] tempBuffer;
} else {
// Raw audio. The number of bytes returned from avcodec_encode_audio()
// is always the same as the number of input bytes.
return _EncodeAudio(buffer, bufferSize, frameCount,
info);
}
return ret;
}
static void free_pkt_fifo(AVFifoBuffer *fifo)
{
AVPacket pkt;
while (av_fifo_size(fifo)) {
av_fifo_generic_read(fifo, &pkt, sizeof(pkt), NULL);
av_free_packet(&pkt);
}
av_fifo_free(fifo);
}
static int audio_read_packet(AVFormatContext *context, AVPacket *pkt)
{
JackData *self = context->priv_data;
struct timespec timeout = {0, 0};
int test;
/* Activate the JACK client on first packet read. Activating the JACK client
* means that process_callback() starts to get called at regular interval.
* If we activate it in audio_read_header(), we're actually reading audio data
* from the device before instructed to, and that may result in an overrun. */
if (!self->activated) {
if (!jack_activate(self->client)) {
self->activated = 1;
av_log(context, AV_LOG_INFO,
"JACK client registered and activated (rate=%dHz, buffer_size=%d frames)\n",
self->sample_rate, self->buffer_size);
} else {
av_log(context, AV_LOG_ERROR, "Unable to activate JACK client\n");
return AVERROR(EIO);
}
}
/* Wait for a packet comming back from process_callback(), if one isn't available yet */
timeout.tv_sec = av_gettime() / 1000000 + 2;
if (sem_timedwait(&self->packet_count, &timeout)) {
if (errno == ETIMEDOUT) {
av_log(context, AV_LOG_ERROR,
"Input error: timed out when waiting for JACK process callback output\n");
} else {
av_log(context, AV_LOG_ERROR, "Error while waiting for audio packet: %s\n",
strerror(errno));
}
if (!self->client)
av_log(context, AV_LOG_ERROR, "Input error: JACK server is gone\n");
return AVERROR(EIO);
}
if (self->pkt_xrun) {
av_log(context, AV_LOG_WARNING, "Audio packet xrun\n");
self->pkt_xrun = 0;
}
if (self->jack_xrun) {
av_log(context, AV_LOG_WARNING, "JACK xrun\n");
self->jack_xrun = 0;
}
/* Retrieve the packet filled with audio data by process_callback() */
av_fifo_generic_read(self->filled_pkts, pkt, sizeof(*pkt), NULL);
if ((test = supply_new_packets(self, context)))
return test;
return 0;
}
static av_cold void uninit(AVFilterContext *ctx)
{
BufferSourceContext *s = ctx->priv;
while (s->fifo && av_fifo_size(s->fifo)) {
AVFrame *frame;
av_fifo_generic_read(s->fifo, &frame, sizeof(frame), NULL);
av_frame_free(&frame);
}
av_fifo_freep(&s->fifo);
}
/**
* \brief read data from buffer and splitting it into channels
* \param bufs num_bufs float buffers, each will contain the data of one channel
* \param cnt number of samples to read per channel
* \param num_bufs number of channels to split the data into
* \return number of samples read per channel, equals cnt unless there was too
* little data in the buffer
*
* Assumes the data in the buffer is of type float, the number of bytes
* read is res * num_bufs * sizeof(float), where res is the return value.
* If there is not enough data in the buffer remaining parts will be filled
* with silence.
*/
static int read_buffer(float **bufs, int cnt, int num_bufs) {
struct deinterleave di = {bufs, num_bufs, 0, 0};
int buffered = av_fifo_size(buffer);
if (cnt * sizeof(float) * num_bufs > buffered) {
silence(bufs, cnt, num_bufs);
cnt = buffered / sizeof(float) / num_bufs;
}
av_fifo_generic_read(buffer, &di, cnt * num_bufs * sizeof(float), deinterleave);
return cnt;
}
static av_cold void uninit(AVFilterContext *ctx)
{
BufferSinkContext *sink = ctx->priv;
while (sink->fifo && av_fifo_size(sink->fifo)) {
AVFilterBufferRef *buf;
av_fifo_generic_read(sink->fifo, &buf, sizeof(buf), NULL);
avfilter_unref_buffer(buf);
}
av_fifo_free(sink->fifo);
}
int ff_qsv_decode(AVCodecContext *avctx, QSVContext *q,
AVFrame *frame, int *got_frame,
AVPacket *avpkt)
{
AVPacket pkt_ref = { 0 };
int ret = 0;
if (q->pkt_fifo && av_fifo_size(q->pkt_fifo) >= sizeof(AVPacket)) {
/* we already have got some buffered packets. so add new to tail */
ret = av_packet_ref(&pkt_ref, avpkt);
if (ret < 0)
return ret;
av_fifo_generic_write(q->pkt_fifo, &pkt_ref, sizeof(pkt_ref), NULL);
}
if (q->reinit_pending) {
ret = do_qsv_decode(avctx, q, frame, got_frame, avpkt);
if (!*got_frame) {
/* Flushing complete, no more frames */
close_decoder(q);
//return ff_qsv_decode(avctx, q, frame, got_frame, avpkt);
}
}
if (!q->reinit_pending) {
if (q->pkt_fifo && av_fifo_size(q->pkt_fifo) >= sizeof(AVPacket)) {
/* process buffered packets */
while (!*got_frame && av_fifo_size(q->pkt_fifo) >= sizeof(AVPacket)) {
av_fifo_generic_read(q->pkt_fifo, &pkt_ref, sizeof(pkt_ref), NULL);
ret = do_qsv_decode(avctx, q, frame, got_frame, &pkt_ref);
if (q->reinit_pending) {
/*
A rare case: new reinit pending when buffering existing.
We should to return the pkt_ref back to same place of fifo
*/
qsv_packet_push_front(q, &pkt_ref);
} else {
av_packet_unref(&pkt_ref);
}
}
} else {
/* general decoding */
ret = do_qsv_decode(avctx, q, frame, got_frame, avpkt);
if (q->reinit_pending) {
ret = av_packet_ref(&pkt_ref, avpkt);
if (ret < 0)
return ret;
av_fifo_generic_write(q->pkt_fifo, &pkt_ref, sizeof(pkt_ref), NULL);
}
}
}
return ret;
}
static int process_callback(jack_nframes_t nframes, void *arg)
{
/* Warning: this function runs in realtime. One mustn't allocate memory here
* or do any other thing that could block. */
int i, j;
JackData *self = arg;
float * buffer;
jack_nframes_t latency, cycle_delay;
AVPacket pkt;
float *pkt_data;
double cycle_time;
if (!self->client)
return 0;
/* The approximate delay since the hardware interrupt as a number of frames */
cycle_delay = jack_frames_since_cycle_start(self->client);
/* Retrieve filtered cycle time */
cycle_time = ff_timefilter_update(self->timefilter,
av_gettime() / 1000000.0 - (double) cycle_delay / self->sample_rate,
self->buffer_size);
/* Check if an empty packet is available, and if there's enough space to send it back once filled */
if ((av_fifo_size(self->new_pkts) < sizeof(pkt)) || (av_fifo_space(self->filled_pkts) < sizeof(pkt))) {
self->pkt_xrun = 1;
return 0;
}
/* Retrieve empty (but allocated) packet */
av_fifo_generic_read(self->new_pkts, &pkt, sizeof(pkt), NULL);
pkt_data = (float *) pkt.data;
latency = 0;
/* Copy and interleave audio data from the JACK buffer into the packet */
for (i = 0; i < self->nports; i++) {
latency += jack_port_get_total_latency(self->client, self->ports[i]);
buffer = jack_port_get_buffer(self->ports[i], self->buffer_size);
for (j = 0; j < self->buffer_size; j++)
pkt_data[j * self->nports + i] = buffer[j];
}
/* Timestamp the packet with the cycle start time minus the average latency */
pkt.pts = (cycle_time - (double) latency / (self->nports * self->sample_rate)) * 1000000.0;
/* Send the now filled packet back, and increase packet counter */
av_fifo_generic_write(self->filled_pkts, &pkt, sizeof(pkt), NULL);
sem_post(&self->packet_count);
return 0;
}
int dc_audio_encoder_encode(AudioOutputFile * p_aout, AudioInputData * p_aind) {
int i_got_pkt;
//AVStream * p_audio_stream = p_aout->p_fmt->streams[p_aout->i_astream_idx];
//AVCodecContext * p_audio_codec_ctx = p_audio_stream->codec;
AVCodecContext * p_audio_codec_ctx = p_aout->p_codec_ctx;
while (av_fifo_size(p_aout->p_fifo) >= p_aout->i_frame_bytes) {
av_fifo_generic_read(p_aout->p_fifo, p_aout->p_adata_buf,
p_aout->i_frame_bytes, NULL);
p_aout->p_aframe->data[0] = p_aout->p_adata_buf;
p_aout->p_aframe->linesize[0] = p_aout->i_frame_bytes;
av_init_packet(&p_aout->packet);
/*
* Set PTS (method 1)
*/
//p_aout->p_aframe->pts = p_aind->next_pts;
/*
* Set PTS (method 2)
* int64_t now = av_gettime();
* outAudioCtx->pOutAudioFrame->pts = av_rescale_q(now,AV_TIME_BASE_Q,
* audioEncCtx->time_base);
*/
/* Encode audio */
if (avcodec_encode_audio2(p_audio_codec_ctx, &p_aout->packet,
p_aout->p_aframe, &i_got_pkt) != 0) {
fprintf(stderr, "Error while encoding audio.\n");
return -1;
}
if (i_got_pkt) {
//p_aout->acc_samples += p_aout->p_aframe->nb_samples;
return 0;
}
av_free_packet(&p_aout->packet);
}
return 1;
}
int ff_qsv_decode_close(QSVContext *q)
{
QSVFrame *cur = q->work_frames;
if (q->session)
MFXVideoDECODE_Close(q->session);
while (q->async_fifo && av_fifo_size(q->async_fifo)) {
QSVFrame *out_frame;
mfxSyncPoint *sync;
av_fifo_generic_read(q->async_fifo, &out_frame, sizeof(out_frame), NULL);
av_fifo_generic_read(q->async_fifo, &sync, sizeof(sync), NULL);
av_freep(&sync);
}
while (cur) {
q->work_frames = cur->next;
av_frame_free(&cur->frame);
av_freep(&cur);
cur = q->work_frames;
}
av_fifo_free(q->async_fifo);
q->async_fifo = NULL;
av_parser_close(q->parser);
avcodec_free_context(&q->avctx_internal);
if (q->internal_session)
MFXClose(q->internal_session);
av_buffer_unref(&q->frames_ctx.hw_frames_ctx);
av_freep(&q->frames_ctx.mids);
q->frames_ctx.nb_mids = 0;
return 0;
}
static av_cold void uninit(AVFilterContext *ctx)
{
BufferSourceContext *s = ctx->priv;
while (s->fifo && av_fifo_size(s->fifo)) {
AVFilterBufferRef *buf;
av_fifo_generic_read(s->fifo, &buf, sizeof(buf), NULL);
avfilter_unref_buffer(buf);
}
av_fifo_free(s->fifo);
s->fifo = NULL;
avfilter_free(s->scale);
s->scale = NULL;
}
static av_cold void uninit(AVFilterContext *ctx)
{
SelectContext *select = ctx->priv;
AVFilterBufferRef *picref;
av_expr_free(select->expr);
select->expr = NULL;
while (select->pending_frames &&
av_fifo_generic_read(select->pending_frames, &picref, sizeof(picref), NULL) == sizeof(picref))
avfilter_unref_buffer(picref);
av_fifo_free(select->pending_frames);
select->pending_frames = NULL;
}
static av_cold void common_uninit(AVFilterContext *ctx)
{
BufferSinkContext *buf = ctx->priv;
AVFilterBufferRef *picref;
if (buf->fifo) {
while (av_fifo_size(buf->fifo) >= sizeof(AVFilterBufferRef *)) {
av_fifo_generic_read(buf->fifo, &picref, sizeof(picref), NULL);
avfilter_unref_buffer(picref);
}
av_fifo_free(buf->fifo);
buf->fifo = NULL;
}
}
int FFMpegFifo::read(unsigned char* dst,int readSize)
{
//SDL_LockMutex(mutex);
if (av_fifo_size(fifo) < readSize)
{
waitReadBytes = readSize;
//SDL_CondWait(condRead,mutex);
}
int ret = av_fifo_generic_read(fifo,dst,readSize,NULL);
if (av_fifo_space(fifo) >= waitWriteBytes)
//SDL_CondSignal(condWrite);
//SDL_UnlockMutex(mutex);
return readSize;
}
static av_cold void uninit(AVFilterContext *ctx)
{
SelectContext *select = ctx->priv;
AVFrame *frame;
av_expr_free(select->expr);
select->expr = NULL;
while (select->pending_frames &&
av_fifo_generic_read(select->pending_frames, &frame, sizeof(frame), NULL) == sizeof(frame))
av_frame_free(&frame);
av_fifo_free(select->pending_frames);
select->pending_frames = NULL;
}
static int request_frame(AVFilterLink *link)
{
BufferSourceContext *c = link->src->priv;
AVFrame *frame;
if (!av_fifo_size(c->fifo)) {
if (c->eof)
return AVERROR_EOF;
c->nb_failed_requests++;
return AVERROR(EAGAIN);
}
av_fifo_generic_read(c->fifo, &frame, sizeof(frame), NULL);
return ff_filter_frame(link, frame);
}
static void mediacodec_decode_flush(AVCodecContext *avctx)
{
MediaCodecH264DecContext *s = avctx->priv_data;
while (av_fifo_size(s->fifo)) {
AVPacket pkt;
av_fifo_generic_read(s->fifo, &pkt, sizeof(pkt), NULL);
av_packet_unref(&pkt);
}
av_fifo_reset(s->fifo);
av_packet_unref(&s->filtered_pkt);
ff_mediacodec_dec_flush(avctx, &s->ctx);
}
static int av_thread_message_queue_recv_locked(AVThreadMessageQueue *mq,
void *msg,
unsigned flags)
{
while (!mq->err_recv && av_fifo_size(mq->fifo) < mq->elsize) {
if ((flags & AV_THREAD_MESSAGE_NONBLOCK))
return AVERROR(EAGAIN);
pthread_cond_wait(&mq->cond, &mq->lock);
}
if (av_fifo_size(mq->fifo) < mq->elsize)
return mq->err_recv;
av_fifo_generic_read(mq->fifo, msg, mq->elsize, NULL);
pthread_cond_signal(&mq->cond);
return 0;
}
static av_cold void uninit(AVFilterContext *ctx)
{
SelectContext *select = ctx->priv;
AVFilterBufferRef *picref;
int i;
av_expr_free(select->expr);
select->expr = NULL;
for (i = 0; i < av_fifo_size(select->pending_frames)/sizeof(picref); i++) {
av_fifo_generic_read(select->pending_frames, &picref, sizeof(picref), NULL);
avfilter_unref_buffer(picref);
}
av_fifo_free(select->pending_frames);
}
static av_cold void uninit(AVFilterContext *ctx)
{
BufferSinkContext *sink = ctx->priv;
AVFrame *frame;
if (sink->audio_fifo)
av_audio_fifo_free(sink->audio_fifo);
if (sink->fifo) {
while (av_fifo_size(sink->fifo) >= FIFO_INIT_ELEMENT_SIZE) {
av_fifo_generic_read(sink->fifo, &frame, sizeof(frame), NULL);
av_frame_free(&frame);
}
av_fifo_freep(&sink->fifo);
}
}
int CacheHttp_Read(void * handle, uint8_t * cache, int size)
{
if(!handle)
return AVERROR(EIO);
CacheHttpContext * s = (CacheHttpContext *)handle;
pthread_mutex_lock(&s->read_mutex);
if (s->fifo) {
int avail;
avail = av_fifo_size(s->fifo);
//av_log(NULL, AV_LOG_INFO, "----------- http_read avail=%d, size=%d ",avail,size);
if(s->is_first_read>0) {
float value = 0.0;
int ret = -1;
ret = am_getconfig_float("libplayer.hls.initial_buffered", &value);
if(ret>=0) {
if(avail/1024<value) {
//av_log(NULL, AV_LOG_INFO, "buffer data avail=%d, initial buffer buffered data size=%f ",avail,value*1024);
pthread_mutex_unlock(&s->read_mutex);
return AVERROR(EAGAIN);
}
}
s->is_first_read = 0;
}
if(url_interrupt_cb()) {
pthread_mutex_unlock(&s->read_mutex);
return 0;
} else if(avail) {
// Maximum amount available
size = FFMIN( avail, size);
av_fifo_generic_read(s->fifo, cache, size, NULL);
pthread_mutex_unlock(&s->read_mutex);
return size;
} else if(s->EXITED) {
pthread_mutex_unlock(&s->read_mutex);
return 0;
} else if(!s->finish_flag) {
pthread_mutex_unlock(&s->read_mutex);
//read just need retry
return AVERROR(EAGAIN);
}
}
pthread_mutex_unlock(&s->read_mutex);
return 0;
}
static int request_frame(AVFilterLink *outlink)
{
ABufferSourceContext *abuffer = outlink->src->priv;
AVFilterBufferRef *samplesref;
if (!av_fifo_size(abuffer->fifo)) {
av_log(outlink->src, AV_LOG_ERROR,
"request_frame() called with no available frames!\n");
return AVERROR(EINVAL);
}
av_fifo_generic_read(abuffer->fifo, &samplesref, sizeof(samplesref), NULL);
avfilter_filter_samples(outlink, avfilter_ref_buffer(samplesref, ~0));
avfilter_unref_buffer(samplesref);
return 0;
}
int av_fifo_realloc2(AVFifoBuffer *f, unsigned int new_size) {
unsigned int old_size= f->end - f->buffer;
if(old_size < new_size){
int len= av_fifo_size(f);
AVFifoBuffer *f2= av_fifo_alloc(new_size);
if (!f2)
return -1;
av_fifo_generic_read(f, f2->buffer, len, NULL);
f2->wptr += len;
f2->wndx += len;
av_free(f->buffer);
*f= *f2;
av_free(f2);
}
return 0;
}
int av_audio_fifo_read(AVAudioFifo *af, void **data, int nb_samples)
{
int i, ret, size;
if (nb_samples < 0)
return AVERROR(EINVAL);
nb_samples = FFMIN(nb_samples, af->nb_samples);
if (!nb_samples)
return 0;
size = nb_samples * af->sample_size;
for (i = 0; i < af->nb_buffers; i++) {
if ((ret = av_fifo_generic_read(af->buf[i], data[i], size, NULL)) < 0)
return AVERROR_BUG;
}
af->nb_samples -= nb_samples;
return nb_samples;
}