static int config_output(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
StreamSelectContext *s = ctx->priv;
const int outlink_idx = FF_OUTLINK_IDX(outlink);
const int inlink_idx = s->map[outlink_idx];
AVFilterLink *inlink = ctx->inputs[inlink_idx];
FFFrameSyncIn *in;
int i, ret;
av_log(ctx, AV_LOG_VERBOSE, "config output link %d "
"with settings from input link %d\n",
outlink_idx, inlink_idx);
switch (outlink->type) {
case AVMEDIA_TYPE_VIDEO:
outlink->w = inlink->w;
outlink->h = inlink->h;
outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;
outlink->frame_rate = inlink->frame_rate;
break;
case AVMEDIA_TYPE_AUDIO:
outlink->sample_rate = inlink->sample_rate;
outlink->channels = inlink->channels;
outlink->channel_layout = inlink->channel_layout;
break;
}
outlink->time_base = inlink->time_base;
outlink->format = inlink->format;
if (s->fs.opaque == s)
return 0;
if ((ret = ff_framesync_init(&s->fs, ctx, ctx->nb_inputs)) < 0)
return ret;
in = s->fs.in;
s->fs.opaque = s;
s->fs.on_event = process_frame;
for (i = 0; i < ctx->nb_inputs; i++) {
in[i].time_base = ctx->inputs[i]->time_base;
in[i].sync = 1;
in[i].before = EXT_STOP;
in[i].after = EXT_STOP;
}
s->frames = av_calloc(ctx->nb_inputs, sizeof(*s->frames));
if (!s->frames)
return AVERROR(ENOMEM);
return ff_framesync_configure(&s->fs);
}
static int request_frame(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
SelectContext *select = ctx->priv;
AVFilterLink *inlink = outlink->src->inputs[0];
int out_no = FF_OUTLINK_IDX(outlink);
do {
int ret = ff_request_frame(inlink);
if (ret < 0)
return ret;
} while (select->select_out != out_no);
return 0;
}
