static int filter_frame(AVFilterLink *inlink, AVFrame *buf)
{
AVFilterContext *ctx = inlink->dst;
MixContext *s = ctx->priv;
AVFilterLink *outlink = ctx->outputs[0];
int i, ret = 0;
for (i = 0; i < ctx->nb_inputs; i++)
if (ctx->inputs[i] == inlink)
break;
if (i >= ctx->nb_inputs) {
av_log(ctx, AV_LOG_ERROR, "unknown input link\n");
ret = AVERROR(EINVAL);
goto fail;
}
if (i == 0) {
int64_t pts = av_rescale_q(buf->pts, inlink->time_base,
outlink->time_base);
ret = frame_list_add_frame(s->frame_list, buf->nb_samples, pts);
if (ret < 0)
goto fail;
}
ret = av_audio_fifo_write(s->fifos[i], (void **)buf->extended_data,
buf->nb_samples);
fail:
av_frame_free(&buf);
return ret;
}
static int activate(AVFilterContext *ctx)
{
AVFilterLink *outlink = ctx->outputs[0];
MixContext *s = ctx->priv;
AVFrame *buf = NULL;
int i, ret;
for (i = 0; i < s->nb_inputs; i++) {
AVFilterLink *inlink = ctx->inputs[i];
if ((ret = ff_inlink_consume_frame(ctx->inputs[i], &buf)) > 0) {
if (i == 0) {
int64_t pts = av_rescale_q(buf->pts, inlink->time_base,
outlink->time_base);
ret = frame_list_add_frame(s->frame_list, buf->nb_samples, pts);
if (ret < 0) {
av_frame_free(&buf);
return ret;
}
}
ret = av_audio_fifo_write(s->fifos[i], (void **)buf->extended_data,
buf->nb_samples);
if (ret < 0) {
av_frame_free(&buf);
return ret;
}
av_frame_free(&buf);
ret = output_frame(outlink);
if (ret < 0)
return ret;
}
}
for (i = 0; i < s->nb_inputs; i++) {
int64_t pts;
int status;
if (ff_inlink_acknowledge_status(ctx->inputs[i], &status, &pts)) {
if (status == AVERROR_EOF) {
if (i == 0) {
s->input_state[i] = 0;
if (s->nb_inputs == 1) {
ff_outlink_set_status(outlink, status, pts);
return 0;
}
} else {
s->input_state[i] |= INPUT_EOF;
if (av_audio_fifo_size(s->fifos[i]) == 0) {
s->input_state[i] = 0;
}
}
}
}
}
if (calc_active_inputs(s)) {
ff_outlink_set_status(outlink, AVERROR_EOF, s->next_pts);
return 0;
}
if (ff_outlink_frame_wanted(outlink)) {
int wanted_samples;
if (!(s->input_state[0] & INPUT_ON))
return request_samples(ctx, 1);
if (s->frame_list->nb_frames == 0) {
ff_inlink_request_frame(ctx->inputs[0]);
return 0;
}
av_assert0(s->frame_list->nb_frames > 0);
wanted_samples = frame_list_next_frame_size(s->frame_list);
return request_samples(ctx, wanted_samples);
}
return 0;
}