uint64_t channel_layout;
char *channel_layout_str;
+ char *channels_str;
+
+ int map[64];
} ChannelSplitContext;
#define OFFSET(x) offsetof(ChannelSplitContext, x)
#define F AV_OPT_FLAG_FILTERING_PARAM
static const AVOption channelsplit_options[] = {
{ "channel_layout", "Input channel layout.", OFFSET(channel_layout_str), AV_OPT_TYPE_STRING, { .str = "stereo" }, .flags = A|F },
+ { "channels", "Channels to extract.", OFFSET(channels_str), AV_OPT_TYPE_STRING, { .str = "all" }, .flags = A|F },
{ NULL }
};
static av_cold int init(AVFilterContext *ctx)
{
ChannelSplitContext *s = ctx->priv;
+ uint64_t channel_layout;
int nb_channels;
- int ret = 0, i;
+ int all = 0, ret = 0, i;
if (!(s->channel_layout = av_get_channel_layout(s->channel_layout_str))) {
av_log(ctx, AV_LOG_ERROR, "Error parsing channel layout '%s'.\n",
goto fail;
}
- nb_channels = av_get_channel_layout_nb_channels(s->channel_layout);
+
+ if (!strcmp(s->channels_str, "all")) {
+ nb_channels = av_get_channel_layout_nb_channels(s->channel_layout);
+ channel_layout = s->channel_layout;
+ all = 1;
+ } else {
+ if ((ret = av_get_extended_channel_layout(s->channels_str, &channel_layout, &nb_channels)) < 0)
+ return ret;
+ }
+
for (i = 0; i < nb_channels; i++) {
- uint64_t channel = av_channel_layout_extract_channel(s->channel_layout, i);
+ uint64_t channel = av_channel_layout_extract_channel(channel_layout, i);
AVFilterPad pad = { 0 };
pad.type = AVMEDIA_TYPE_AUDIO;
pad.name = av_get_channel_name(channel);
+ if (all) {
+ s->map[i] = i;
+ } else {
+ if ((ret = av_get_channel_layout_channel_index(s->channel_layout, channel)) < 0) {
+ av_log(ctx, AV_LOG_ERROR, "Channel name '%s' not present in channel layout '%s'.\n",
+ av_get_channel_name(channel), s->channel_layout_str);
+ return ret;
+ }
+
+ s->map[i] = ret;
+ }
+
if ((ret = ff_insert_outpad(ctx, i, &pad)) < 0) {
return ret;
}
for (i = 0; i < ctx->nb_outputs; i++) {
AVFilterChannelLayouts *out_layouts = NULL;
- uint64_t channel = av_channel_layout_extract_channel(s->channel_layout, i);
+ uint64_t channel = av_channel_layout_extract_channel(s->channel_layout, s->map[i]);
if ((ret = ff_add_channel_layout(&out_layouts, channel)) < 0 ||
(ret = ff_channel_layouts_ref(out_layouts, &ctx->outputs[i]->in_channel_layouts)) < 0)
static int filter_frame(AVFilterLink *inlink, AVFrame *buf)
{
AVFilterContext *ctx = inlink->dst;
+ ChannelSplitContext *s = ctx->priv;
int i, ret = 0;
for (i = 0; i < ctx->nb_outputs; i++) {
break;
}
- buf_out->data[0] = buf_out->extended_data[0] = buf_out->extended_data[i];
+ buf_out->data[0] = buf_out->extended_data[0] = buf_out->extended_data[s->map[i]];
buf_out->channel_layout =
- av_channel_layout_extract_channel(buf->channel_layout, i);
+ av_channel_layout_extract_channel(buf->channel_layout, s->map[i]);
buf_out->channels = 1;
ret = ff_filter_frame(ctx->outputs[i], buf_out);