2012-05-30 11:59:30 +00:00
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/*
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2013-08-15 21:12:51 +00:00
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* This file is part of FFmpeg.
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2012-05-30 11:59:30 +00:00
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*
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2013-08-15 21:12:51 +00:00
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* FFmpeg is free software; you can redistribute it and/or
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2012-05-30 11:59:30 +00:00
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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2013-08-15 21:12:51 +00:00
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* FFmpeg is distributed in the hope that it will be useful,
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2012-05-30 11:59:30 +00:00
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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2013-08-15 21:12:51 +00:00
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* License along with FFmpeg; if not, write to the Free Software
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2012-05-30 11:59:30 +00:00
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* Channel split filter
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*
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* Split an audio stream into per-channel streams.
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*/
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2013-04-30 16:30:02 +00:00
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#include "libavutil/attributes.h"
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2012-11-10 15:00:00 +00:00
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#include "libavutil/channel_layout.h"
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2012-08-06 13:49:32 +00:00
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#include "libavutil/internal.h"
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2012-05-30 11:59:30 +00:00
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#include "libavutil/opt.h"
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#include "audio.h"
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#include "avfilter.h"
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#include "formats.h"
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#include "internal.h"
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typedef struct ChannelSplitContext {
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const AVClass *class;
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uint64_t channel_layout;
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char *channel_layout_str;
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2018-03-20 17:02:26 +00:00
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char *channels_str;
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int map[64];
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2012-05-30 11:59:30 +00:00
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} ChannelSplitContext;
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#define OFFSET(x) offsetof(ChannelSplitContext, x)
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#define A AV_OPT_FLAG_AUDIO_PARAM
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2012-08-13 11:40:01 +00:00
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#define F AV_OPT_FLAG_FILTERING_PARAM
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2012-06-22 12:33:09 +00:00
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static const AVOption channelsplit_options[] = {
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2012-08-13 11:40:01 +00:00
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{ "channel_layout", "Input channel layout.", OFFSET(channel_layout_str), AV_OPT_TYPE_STRING, { .str = "stereo" }, .flags = A|F },
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2018-03-20 17:02:26 +00:00
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{ "channels", "Channels to extract.", OFFSET(channels_str), AV_OPT_TYPE_STRING, { .str = "all" }, .flags = A|F },
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2013-09-07 12:13:50 +00:00
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{ NULL }
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2012-05-30 11:59:30 +00:00
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};
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2012-06-22 12:33:09 +00:00
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AVFILTER_DEFINE_CLASS(channelsplit);
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2012-05-30 11:59:30 +00:00
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2013-04-30 16:30:02 +00:00
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static av_cold int init(AVFilterContext *ctx)
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2012-05-30 11:59:30 +00:00
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{
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ChannelSplitContext *s = ctx->priv;
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2018-03-20 17:02:26 +00:00
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uint64_t channel_layout;
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2012-05-30 11:59:30 +00:00
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int nb_channels;
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2018-03-20 17:02:26 +00:00
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int all = 0, ret = 0, i;
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2012-05-30 11:59:30 +00:00
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if (!(s->channel_layout = av_get_channel_layout(s->channel_layout_str))) {
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av_log(ctx, AV_LOG_ERROR, "Error parsing channel layout '%s'.\n",
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s->channel_layout_str);
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ret = AVERROR(EINVAL);
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goto fail;
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}
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2018-03-20 17:02:26 +00:00
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if (!strcmp(s->channels_str, "all")) {
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nb_channels = av_get_channel_layout_nb_channels(s->channel_layout);
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channel_layout = s->channel_layout;
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all = 1;
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} else {
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if ((ret = av_get_extended_channel_layout(s->channels_str, &channel_layout, &nb_channels)) < 0)
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return ret;
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}
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2012-05-30 11:59:30 +00:00
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for (i = 0; i < nb_channels; i++) {
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2018-03-20 17:02:26 +00:00
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uint64_t channel = av_channel_layout_extract_channel(channel_layout, i);
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2012-05-30 11:59:30 +00:00
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AVFilterPad pad = { 0 };
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pad.type = AVMEDIA_TYPE_AUDIO;
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pad.name = av_get_channel_name(channel);
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2018-03-20 17:02:26 +00:00
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if (all) {
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s->map[i] = i;
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} else {
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if ((ret = av_get_channel_layout_channel_index(s->channel_layout, channel)) < 0) {
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av_log(ctx, AV_LOG_ERROR, "Channel name '%s' not present in channel layout '%s'.\n",
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av_get_channel_name(channel), s->channel_layout_str);
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return ret;
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}
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s->map[i] = ret;
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}
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2021-08-16 18:48:00 +00:00
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if ((ret = ff_append_outpad(ctx, &pad)) < 0)
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2017-08-25 08:01:52 +00:00
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return ret;
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2012-05-30 11:59:30 +00:00
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}
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fail:
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return ret;
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}
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static int query_formats(AVFilterContext *ctx)
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{
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ChannelSplitContext *s = ctx->priv;
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AVFilterChannelLayouts *in_layouts = NULL;
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2015-10-05 03:39:25 +00:00
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int i, ret;
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2012-05-30 11:59:30 +00:00
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2015-10-05 03:39:25 +00:00
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if ((ret = ff_set_common_formats(ctx, ff_planar_sample_fmts())) < 0 ||
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2021-08-09 23:25:31 +00:00
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(ret = ff_set_common_all_samplerates(ctx)) < 0)
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2015-10-05 03:39:25 +00:00
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return ret;
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2012-05-30 11:59:30 +00:00
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2015-10-05 03:39:25 +00:00
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if ((ret = ff_add_channel_layout(&in_layouts, s->channel_layout)) < 0 ||
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2020-08-24 10:16:34 +00:00
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(ret = ff_channel_layouts_ref(in_layouts, &ctx->inputs[0]->outcfg.channel_layouts)) < 0)
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2015-10-05 03:39:25 +00:00
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return ret;
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2012-05-30 11:59:30 +00:00
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2012-06-12 19:25:10 +00:00
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for (i = 0; i < ctx->nb_outputs; i++) {
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2012-05-30 11:59:30 +00:00
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AVFilterChannelLayouts *out_layouts = NULL;
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2018-03-20 17:02:26 +00:00
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uint64_t channel = av_channel_layout_extract_channel(s->channel_layout, s->map[i]);
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2012-05-30 11:59:30 +00:00
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2015-10-05 03:39:25 +00:00
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if ((ret = ff_add_channel_layout(&out_layouts, channel)) < 0 ||
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2020-08-24 10:16:34 +00:00
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(ret = ff_channel_layouts_ref(out_layouts, &ctx->outputs[i]->incfg.channel_layouts)) < 0)
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2015-10-05 03:39:25 +00:00
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return ret;
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2012-05-30 11:59:30 +00:00
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}
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return 0;
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}
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2012-11-28 07:41:07 +00:00
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static int filter_frame(AVFilterLink *inlink, AVFrame *buf)
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2012-05-30 11:59:30 +00:00
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{
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AVFilterContext *ctx = inlink->dst;
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2018-03-20 17:02:26 +00:00
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ChannelSplitContext *s = ctx->priv;
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2012-07-02 18:13:40 +00:00
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int i, ret = 0;
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2012-05-30 11:59:30 +00:00
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2012-06-12 19:25:10 +00:00
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for (i = 0; i < ctx->nb_outputs; i++) {
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2012-11-28 07:41:07 +00:00
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AVFrame *buf_out = av_frame_clone(buf);
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2012-05-30 11:59:30 +00:00
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2012-07-02 18:13:40 +00:00
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if (!buf_out) {
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ret = AVERROR(ENOMEM);
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break;
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}
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2012-05-30 11:59:30 +00:00
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2018-03-20 17:02:26 +00:00
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buf_out->data[0] = buf_out->extended_data[0] = buf_out->extended_data[s->map[i]];
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2012-11-28 07:41:07 +00:00
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buf_out->channel_layout =
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2018-03-20 17:02:26 +00:00
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av_channel_layout_extract_channel(buf->channel_layout, s->map[i]);
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2017-04-22 08:57:18 +00:00
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buf_out->channels = 1;
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2012-05-30 11:59:30 +00:00
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2012-11-28 12:53:48 +00:00
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ret = ff_filter_frame(ctx->outputs[i], buf_out);
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2012-07-02 18:13:40 +00:00
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if (ret < 0)
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break;
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2012-05-30 11:59:30 +00:00
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}
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2012-11-28 07:41:07 +00:00
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av_frame_free(&buf);
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2012-07-02 18:13:40 +00:00
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return ret;
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2012-05-30 11:59:30 +00:00
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}
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2012-07-24 13:14:01 +00:00
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static const AVFilterPad avfilter_af_channelsplit_inputs[] = {
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{
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2013-09-07 12:13:50 +00:00
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.name = "default",
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.type = AVMEDIA_TYPE_AUDIO,
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.filter_frame = filter_frame,
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2012-07-24 13:14:01 +00:00
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},
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};
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2021-04-19 16:33:56 +00:00
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const AVFilter ff_af_channelsplit = {
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2012-05-30 11:59:30 +00:00
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.name = "channelsplit",
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2013-04-14 18:58:31 +00:00
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.description = NULL_IF_CONFIG_SMALL("Split audio into per-channel streams."),
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2012-05-30 11:59:30 +00:00
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.priv_size = sizeof(ChannelSplitContext),
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2013-02-25 20:21:29 +00:00
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.priv_class = &channelsplit_class,
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2012-05-30 11:59:30 +00:00
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.init = init,
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2021-08-12 11:05:31 +00:00
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FILTER_INPUTS(avfilter_af_channelsplit_inputs),
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2013-09-07 12:13:50 +00:00
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.outputs = NULL,
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2021-09-27 10:07:35 +00:00
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FILTER_QUERY_FUNC(query_formats),
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2013-09-07 12:13:50 +00:00
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.flags = AVFILTER_FLAG_DYNAMIC_OUTPUTS,
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2012-05-30 11:59:30 +00:00
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};
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