int ff_request_frame(AVFilterLink *link)
{
int ret = -1;
FF_TPRINTF_START(NULL, request_frame); ff_tlog_link(NULL, link, 1);
if (link->closed)
return AVERROR_EOF;
av_assert0(!link->frame_requested);
link->frame_requested = 1;
while (link->frame_requested) {
if (link->srcpad->request_frame)
ret = link->srcpad->request_frame(link);
else if (link->src->inputs[0])
ret = ff_request_frame(link->src->inputs[0]);
if (ret == AVERROR_EOF && link->partial_buf) {
AVFrame *pbuf = link->partial_buf;
link->partial_buf = NULL;
ret = ff_filter_frame_framed(link, pbuf);
}
if (ret < 0) {
link->frame_requested = 0;
if (ret == AVERROR_EOF)
link->closed = 1;
} else {
av_assert0(!link->frame_requested ||
link->flags & FF_LINK_FLAG_REQUEST_LOOP);
}
}
return ret;
}
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
{
FF_TPRINTF_START(NULL, filter_frame); ff_tlog_link(NULL, link, 1); ff_tlog(NULL, " "); ff_tlog_ref(NULL, frame, 1);
/* Consistency checks */
if (link->type == AVMEDIA_TYPE_VIDEO) {
if (strcmp(link->dst->filter->name, "scale") &&
strcmp(link->dst->filter->name, "idet")) {
av_assert1(frame->format == link->format);
av_assert1(frame->width == link->w);
av_assert1(frame->height == link->h);
}
} else {
av_assert1(frame->format == link->format);
av_assert1(av_frame_get_channels(frame) == link->channels);
av_assert1(frame->channel_layout == link->channel_layout);
av_assert1(frame->sample_rate == link->sample_rate);
}
/* Go directly to actual filtering if possible */
if (link->type == AVMEDIA_TYPE_AUDIO &&
link->min_samples &&
(link->partial_buf ||
frame->nb_samples < link->min_samples ||
frame->nb_samples > link->max_samples)) {
return ff_filter_frame_needs_framing(link, frame);
} else {
return ff_filter_frame_framed(link, frame);
}
}
int ff_filter_frame_to_filter(AVFilterLink *link)
{
AVFrame *frame;
AVFilterContext *dst = link->dst;
int ret;
av_assert1(ff_framequeue_queued_frames(&link->fifo));
if (link->min_samples) {
int min = link->min_samples;
if (link->status_in)
min = FFMIN(min, ff_framequeue_queued_samples(&link->fifo));
ret = take_samples(link, min, link->max_samples, &frame);
if (ret < 0)
return ret;
} else {
frame = ff_framequeue_take(&link->fifo);
}
/* The filter will soon have received a new frame, that may allow it to
produce one or more: unblock its outputs. */
filter_unblock(dst);
ret = ff_filter_frame_framed(link, frame);
if (ret < 0 && ret != link->status_out) {
ff_avfilter_link_set_out_status(link, ret, AV_NOPTS_VALUE);
} else {
/* Run once again, to see if several frames were available, or if
the input status has also changed, or any other reason. */
ff_filter_set_ready(dst, 300);
}
return ret;
}
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
{
FF_TPRINTF_START(NULL, filter_frame); ff_tlog_link(NULL, link, 1); ff_tlog(NULL, " "); ff_tlog_ref(NULL, frame, 1);
/* Consistency checks */
if (link->type == AVMEDIA_TYPE_VIDEO) {
if (strcmp(link->dst->filter->name, "buffersink") &&
strcmp(link->dst->filter->name, "format") &&
strcmp(link->dst->filter->name, "idet") &&
strcmp(link->dst->filter->name, "null") &&
strcmp(link->dst->filter->name, "scale")) {
av_assert1(frame->format == link->format);
av_assert1(frame->width == link->w);
av_assert1(frame->height == link->h);
}
} else {
if (frame->format != link->format) {
av_log(link->dst, AV_LOG_ERROR, "Format change is not supported\n");
goto error;
}
if (av_frame_get_channels(frame) != link->channels) {
av_log(link->dst, AV_LOG_ERROR, "Channel count change is not supported\n");
goto error;
}
if (frame->channel_layout != link->channel_layout) {
av_log(link->dst, AV_LOG_ERROR, "Channel layout change is not supported\n");
goto error;
}
if (frame->sample_rate != link->sample_rate) {
av_log(link->dst, AV_LOG_ERROR, "Sample rate change is not supported\n");
goto error;
}
}
/* Go directly to actual filtering if possible */
if (link->type == AVMEDIA_TYPE_AUDIO &&
link->min_samples &&
(link->partial_buf ||
frame->nb_samples < link->min_samples ||
frame->nb_samples > link->max_samples)) {
return ff_filter_frame_needs_framing(link, frame);
} else {
return ff_filter_frame_framed(link, frame);
}
error:
av_frame_free(&frame);
return AVERROR_PATCHWELCOME;
}
static int ff_filter_frame_needs_framing(AVFilterLink *link, AVFrame *frame)
{
int insamples = frame->nb_samples, inpos = 0, nb_samples;
AVFrame *pbuf = link->partial_buf;
int nb_channels = av_frame_get_channels(frame);
int ret = 0;
link->flags |= FF_LINK_FLAG_REQUEST_LOOP;
/* Handle framing (min_samples, max_samples) */
while (insamples) {
if (!pbuf) {
AVRational samples_tb = { 1, link->sample_rate };
pbuf = ff_get_audio_buffer(link, link->partial_buf_size);
if (!pbuf) {
av_log(link->dst, AV_LOG_WARNING,
"Samples dropped due to memory allocation failure.\n");
return 0;
}
av_frame_copy_props(pbuf, frame);
pbuf->pts = frame->pts;
if (pbuf->pts != AV_NOPTS_VALUE)
pbuf->pts += av_rescale_q(inpos, samples_tb, link->time_base);
pbuf->nb_samples = 0;
}
nb_samples = FFMIN(insamples,
link->partial_buf_size - pbuf->nb_samples);
av_samples_copy(pbuf->extended_data, frame->extended_data,
pbuf->nb_samples, inpos,
nb_samples, nb_channels, link->format);
inpos += nb_samples;
insamples -= nb_samples;
pbuf->nb_samples += nb_samples;
if (pbuf->nb_samples >= link->min_samples) {
ret = ff_filter_frame_framed(link, pbuf);
pbuf = NULL;
}
}
av_frame_free(&frame);
link->partial_buf = pbuf;
return ret;
}
int ff_request_frame(AVFilterLink *link)
{
int ret = -1;
FF_TPRINTF_START(NULL, request_frame); ff_tlog_link(NULL, link, 1);
if (link->closed)
return AVERROR_EOF;
if (link->srcpad->request_frame)
ret = link->srcpad->request_frame(link);
else if (link->src->inputs[0])
ret = ff_request_frame(link->src->inputs[0]);
if (ret == AVERROR_EOF && link->partial_buf) {
AVFrame *pbuf = link->partial_buf;
link->partial_buf = NULL;
ret = ff_filter_frame_framed(link, pbuf);
}
if (ret < 0) {
if (ret == AVERROR_EOF)
link->closed = 1;
}
return ret;
}
