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;
}
static int activate(AVFilterContext *ctx)
{
AVFilterLink *inlink = ctx->inputs[0];
AVFilterLink *outlink = ctx->outputs[0];
CueContext *s = ctx->priv;
int64_t pts;
AVFrame *frame = NULL;
FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink);
if (s->status < 3 || s->status == 5) {
int ret = ff_inlink_consume_frame(inlink, &frame);
if (ret < 0)
return ret;
if (frame)
pts = av_rescale_q(frame->pts, inlink->time_base, AV_TIME_BASE_Q);
}
if (!s->status && frame) {
s->first_pts = pts;
s->status++;
}
if (s->status == 1 && frame) {
if (pts - s->first_pts < s->preroll)
return ff_filter_frame(outlink, frame);
s->first_pts = pts;
s->status++;
}
if (s->status == 2 && frame) {
int ret = ff_framequeue_add(&s->queue, frame);
if (ret < 0) {
av_frame_free(&frame);
return ret;
}
frame = NULL;
if (!(pts - s->first_pts < s->buffer && (av_gettime() - s->cue) < 0))
s->status++;
}
if (s->status == 3) {
int64_t diff;
while ((diff = (av_gettime() - s->cue)) < 0)
av_usleep(av_clip(-diff / 2, 100, 1000000));
s->status++;
}
if (s->status == 4) {
if (ff_framequeue_queued_frames(&s->queue))
return ff_filter_frame(outlink, ff_framequeue_take(&s->queue));
s->status++;
}
if (s->status == 5 && frame)
return ff_filter_frame(outlink, frame);
FF_FILTER_FORWARD_STATUS(inlink, outlink);
FF_FILTER_FORWARD_WANTED(outlink, inlink);
return FFERROR_NOT_READY;
}
int ff_request_frame(AVFilterLink *link)
{
FF_TPRINTF_START(NULL, request_frame); ff_tlog_link(NULL, link, 1);
if (link->status_out)
return link->status_out;
if (link->status_in) {
if (ff_framequeue_queued_frames(&link->fifo)) {
av_assert1(!link->frame_wanted_out);
av_assert1(link->dst->ready >= 300);
return 0;
} else {
/* Acknowledge status change. Filters using ff_request_frame() will
handle the change automatically. Filters can also check the
status directly but none do yet. */
ff_avfilter_link_set_out_status(link, link->status_in, link->status_in_pts);
return link->status_out;
}
}
link->frame_wanted_out = 1;
ff_filter_set_ready(link->src, 100);
return 0;
}
static int ff_filter_activate_default(AVFilterContext *filter)
{
unsigned i;
for (i = 0; i < filter->nb_inputs; i++) {
if (samples_ready(filter->inputs[i])) {
return ff_filter_frame_to_filter(filter->inputs[i]);
}
}
for (i = 0; i < filter->nb_inputs; i++) {
if (filter->inputs[i]->status_in && !filter->inputs[i]->status_out) {
av_assert1(!ff_framequeue_queued_frames(&filter->inputs[i]->fifo));
return forward_status_change(filter, filter->inputs[i]);
}
}
for (i = 0; i < filter->nb_outputs; i++) {
if (filter->outputs[i]->frame_wanted_out &&
!filter->outputs[i]->frame_blocked_in) {
return ff_request_frame_to_filter(filter->outputs[i]);
}
}
return FFERROR_NOT_READY;
}
static int take_samples(AVFilterLink *link, unsigned min, unsigned max,
AVFrame **rframe)
{
AVFrame *frame0, *frame, *buf;
unsigned nb_samples, nb_frames, i, p;
int ret;
/* Note: this function relies on no format changes and must only be
called with enough samples. */
av_assert1(samples_ready(link));
frame0 = frame = ff_framequeue_peek(&link->fifo, 0);
if (frame->nb_samples >= min && frame->nb_samples < max) {
*rframe = ff_framequeue_take(&link->fifo);
return 0;
}
nb_frames = 0;
nb_samples = 0;
while (1) {
if (nb_samples + frame->nb_samples > max) {
if (nb_samples < min)
nb_samples = max;
break;
}
nb_samples += frame->nb_samples;
nb_frames++;
if (nb_frames == ff_framequeue_queued_frames(&link->fifo))
break;
frame = ff_framequeue_peek(&link->fifo, nb_frames);
}
buf = ff_get_audio_buffer(link, nb_samples);
if (!buf)
return AVERROR(ENOMEM);
ret = av_frame_copy_props(buf, frame0);
if (ret < 0) {
av_frame_free(&buf);
return ret;
}
buf->pts = frame0->pts;
p = 0;
for (i = 0; i < nb_frames; i++) {
frame = ff_framequeue_take(&link->fifo);
av_samples_copy(buf->extended_data, frame->extended_data, p, 0,
frame->nb_samples, link->channels, link->format);
p += frame->nb_samples;
av_frame_free(&frame);
}
if (p < nb_samples) {
unsigned n = nb_samples - p;
frame = ff_framequeue_peek(&link->fifo, 0);
av_samples_copy(buf->extended_data, frame->extended_data, p, 0, n,
link->channels, link->format);
frame->nb_samples -= n;
av_samples_copy(frame->extended_data, frame->extended_data, 0, n,
frame->nb_samples, link->channels, link->format);
if (frame->pts != AV_NOPTS_VALUE)
frame->pts += av_rescale_q(n, av_make_q(1, link->sample_rate), link->time_base);
ff_framequeue_update_peeked(&link->fifo, 0);
ff_framequeue_skip_samples(&link->fifo, n);
}
*rframe = buf;
return 0;
}
static int samples_ready(AVFilterLink *link)
{
return ff_framequeue_queued_frames(&link->fifo) &&
(ff_framequeue_queued_samples(&link->fifo) >= link->min_samples ||
link->status_in);
}
