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_filter_frame(AVFilterLink *link, AVFrame *frame)
{
int ret;
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;
}
}
link->frame_blocked_in = link->frame_wanted_out = 0;
link->frame_count_in++;
filter_unblock(link->dst);
ret = ff_framequeue_add(&link->fifo, frame);
if (ret < 0) {
av_frame_free(&frame);
return ret;
}
ff_filter_set_ready(link->dst, 300);
return 0;
error:
av_frame_free(&frame);
return AVERROR_PATCHWELCOME;
}