static int filter_frame(AVFilterLink *inlink, AVFrame *buf)
{
AVFilterContext *ctx = inlink->dst;
int i, ret = 0;
for (i = 0; i < ctx->nb_outputs; i++) {
AVFrame *buf_out = av_frame_clone(buf);
if (!buf_out) {
ret = AVERROR(ENOMEM);
break;
}
buf_out->data[0] = buf_out->extended_data[0] = buf_out->extended_data[i];
buf_out->channel_layout =
av_channel_layout_extract_channel(buf->channel_layout, i);
av_frame_set_channels(buf_out, 1);
ret = ff_filter_frame(ctx->outputs[i], buf_out);
if (ret < 0)
break;
}
av_frame_free(&buf);
return ret;
}
int avfilter_copy_buf_props(AVFrame *dst, const AVFilterBufferRef *src)
{
int planes, nb_channels;
if (!dst)
return AVERROR(EINVAL);
/* abort in case the src is NULL and dst is not, avoid inconsistent state in dst */
av_assert0(src);
memcpy(dst->data, src->data, sizeof(dst->data));
memcpy(dst->linesize, src->linesize, sizeof(dst->linesize));
dst->pts = src->pts;
dst->format = src->format;
av_frame_set_pkt_pos(dst, src->pos);
switch (src->type) {
case AVMEDIA_TYPE_VIDEO:
av_assert0(src->video);
dst->width = src->video->w;
dst->height = src->video->h;
dst->sample_aspect_ratio = src->video->sample_aspect_ratio;
dst->interlaced_frame = src->video->interlaced;
dst->top_field_first = src->video->top_field_first;
dst->key_frame = src->video->key_frame;
dst->pict_type = src->video->pict_type;
break;
case AVMEDIA_TYPE_AUDIO:
av_assert0(src->audio);
nb_channels = av_get_channel_layout_nb_channels(src->audio->channel_layout);
planes = av_sample_fmt_is_planar(src->format) ? nb_channels : 1;
if (planes > FF_ARRAY_ELEMS(dst->data)) {
dst->extended_data = av_mallocz_array(planes, sizeof(*dst->extended_data));
if (!dst->extended_data)
return AVERROR(ENOMEM);
memcpy(dst->extended_data, src->extended_data,
planes * sizeof(*dst->extended_data));
} else
dst->extended_data = dst->data;
dst->nb_samples = src->audio->nb_samples;
av_frame_set_sample_rate (dst, src->audio->sample_rate);
av_frame_set_channel_layout(dst, src->audio->channel_layout);
av_frame_set_channels (dst, src->audio->channels);
break;
default:
return AVERROR(EINVAL);
}
return 0;
}
static int filter_frame(AVFilterLink *inlink, AVFrame *insamplesref)
{
AConvertContext *aconvert = inlink->dst->priv;
const int n = insamplesref->nb_samples;
AVFilterLink *const outlink = inlink->dst->outputs[0];
AVFrame *outsamplesref = ff_get_audio_buffer(outlink, n);
int ret;
if (!outsamplesref)
return AVERROR(ENOMEM);
swr_convert(aconvert->swr, outsamplesref->extended_data, n,
(void *)insamplesref->extended_data, n);
av_frame_copy_props(outsamplesref, insamplesref);
av_frame_set_channels(outsamplesref, outlink->channels);
outsamplesref->channel_layout = outlink->channel_layout;
ret = ff_filter_frame(outlink, outsamplesref);
av_frame_free(&insamplesref);
return ret;
}
static int filter(struct af_instance *af, struct mp_audio *data, int flags)
{
struct priv *p = af->priv;
struct mp_audio *r = af->data;
bool eof = data->samples == 0 && (flags & AF_FILTER_FLAG_EOF);
AVFilterLink *l_in = p->in->outputs[0];
AVFrame *frame = av_frame_alloc();
frame->nb_samples = data->samples;
frame->format = l_in->format;
// Timebase is 1/sample_rate
frame->pts = p->samples_in;
av_frame_set_channels(frame, l_in->channels);
av_frame_set_channel_layout(frame, l_in->channel_layout);
av_frame_set_sample_rate(frame, l_in->sample_rate);
frame->extended_data = frame->data;
for (int n = 0; n < data->num_planes; n++)
frame->data[n] = data->planes[n];
frame->linesize[0] = frame->nb_samples * data->sstride;
if (av_buffersrc_add_frame(p->in, eof ? NULL : frame) < 0) {
av_frame_free(&frame);
return -1;
}
av_frame_free(&frame);
int64_t out_pts = AV_NOPTS_VALUE;
r->samples = 0;
for (;;) {
frame = av_frame_alloc();
if (av_buffersink_get_frame(p->out, frame) < 0) {
// Not an error situation - no more output buffers in queue.
av_frame_free(&frame);
break;
}
mp_audio_realloc_min(r, r->samples + frame->nb_samples);
for (int n = 0; n < r->num_planes; n++) {
memcpy((char *)r->planes[n] + r->samples * r->sstride,
frame->extended_data[n], frame->nb_samples * r->sstride);
}
r->samples += frame->nb_samples;
if (out_pts == AV_NOPTS_VALUE)
out_pts = frame->pts;
av_frame_free(&frame);
}
p->samples_in += data->samples;
if (out_pts != AV_NOPTS_VALUE) {
double in_time = p->samples_in / (double)data->rate;
double out_time = out_pts * av_q2d(p->timebase_out);
// Need pts past the last output sample.
out_time += r->samples / (double)r->rate;
af->delay = in_time - out_time;
}
*data = *r;
return 0;
}
