mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-02 03:06:28 +02:00
6d75d44d90
All that remains in it are things that belong in avfilter_internal.h. Move them there and remove internal.h
240 lines
7.1 KiB
C
240 lines
7.1 KiB
C
/*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* Channel split filter
|
|
*
|
|
* Split an audio stream into per-channel streams.
|
|
*/
|
|
#include "libavutil/avassert.h"
|
|
#include "libavutil/attributes.h"
|
|
#include "libavutil/channel_layout.h"
|
|
#include "libavutil/internal.h"
|
|
#include "libavutil/mem.h"
|
|
#include "libavutil/opt.h"
|
|
|
|
#include "audio.h"
|
|
#include "avfilter.h"
|
|
#include "filters.h"
|
|
#include "formats.h"
|
|
|
|
#define MAX_CH 64
|
|
|
|
typedef struct ChannelSplitContext {
|
|
const AVClass *class;
|
|
|
|
AVChannelLayout channel_layout;
|
|
char *channels_str;
|
|
|
|
int map[64];
|
|
} ChannelSplitContext;
|
|
|
|
#define OFFSET(x) offsetof(ChannelSplitContext, x)
|
|
#define A AV_OPT_FLAG_AUDIO_PARAM
|
|
#define F AV_OPT_FLAG_FILTERING_PARAM
|
|
static const AVOption channelsplit_options[] = {
|
|
{ "channel_layout", "Input channel layout.", OFFSET(channel_layout), AV_OPT_TYPE_CHLAYOUT, { .str = "stereo" }, .flags = A|F },
|
|
{ "channels", "Channels to extract.", OFFSET(channels_str), AV_OPT_TYPE_STRING, { .str = "all" }, .flags = A|F },
|
|
{ NULL }
|
|
};
|
|
|
|
AVFILTER_DEFINE_CLASS(channelsplit);
|
|
|
|
static av_cold int init(AVFilterContext *ctx)
|
|
{
|
|
ChannelSplitContext *s = ctx->priv;
|
|
AVChannelLayout channel_layout = { 0 };
|
|
int all = 0, ret = 0, i;
|
|
|
|
if (!strcmp(s->channels_str, "all")) {
|
|
if ((ret = av_channel_layout_copy(&channel_layout, &s->channel_layout)) < 0)
|
|
goto fail;
|
|
all = 1;
|
|
} else {
|
|
if ((ret = av_channel_layout_from_string(&channel_layout, s->channels_str)) < 0)
|
|
goto fail;
|
|
}
|
|
|
|
if (channel_layout.nb_channels > MAX_CH) {
|
|
av_log(ctx, AV_LOG_ERROR, "Too many channels\n");
|
|
goto fail;
|
|
}
|
|
|
|
for (i = 0; i < channel_layout.nb_channels; i++) {
|
|
enum AVChannel channel = av_channel_layout_channel_from_index(&channel_layout, i);
|
|
char buf[64];
|
|
AVFilterPad pad = { .flags = AVFILTERPAD_FLAG_FREE_NAME };
|
|
|
|
av_channel_name(buf, sizeof(buf), channel);
|
|
pad.type = AVMEDIA_TYPE_AUDIO;
|
|
pad.name = av_strdup(buf);
|
|
if (!pad.name) {
|
|
ret = AVERROR(ENOMEM);
|
|
goto fail;
|
|
}
|
|
|
|
if (all) {
|
|
s->map[i] = i;
|
|
} else {
|
|
char buf[128];
|
|
av_channel_layout_describe(&s->channel_layout, buf, sizeof(buf));
|
|
if ((ret = av_channel_layout_index_from_channel(&s->channel_layout, channel)) < 0) {
|
|
av_log(ctx, AV_LOG_ERROR, "Channel name '%s' not present in channel layout '%s'.\n",
|
|
pad.name, buf);
|
|
av_freep(&pad.name);
|
|
goto fail;
|
|
}
|
|
|
|
s->map[i] = ret;
|
|
}
|
|
|
|
if ((ret = ff_append_outpad(ctx, &pad)) < 0)
|
|
goto fail;
|
|
}
|
|
|
|
fail:
|
|
av_channel_layout_uninit(&channel_layout);
|
|
return ret;
|
|
}
|
|
|
|
static av_cold void uninit(AVFilterContext *ctx)
|
|
{
|
|
ChannelSplitContext *s = ctx->priv;
|
|
|
|
av_channel_layout_uninit(&s->channel_layout);
|
|
}
|
|
|
|
static int query_formats(AVFilterContext *ctx)
|
|
{
|
|
ChannelSplitContext *s = ctx->priv;
|
|
AVFilterChannelLayouts *in_layouts = NULL;
|
|
int i, ret;
|
|
|
|
if ((ret = ff_set_common_formats(ctx, ff_planar_sample_fmts())) < 0 ||
|
|
(ret = ff_set_common_all_samplerates(ctx)) < 0)
|
|
return ret;
|
|
|
|
if ((ret = ff_add_channel_layout(&in_layouts, &s->channel_layout)) < 0 ||
|
|
(ret = ff_channel_layouts_ref(in_layouts, &ctx->inputs[0]->outcfg.channel_layouts)) < 0)
|
|
return ret;
|
|
|
|
for (i = 0; i < ctx->nb_outputs; i++) {
|
|
AVChannelLayout channel_layout = { 0 };
|
|
AVFilterChannelLayouts *out_layouts = NULL;
|
|
enum AVChannel channel = av_channel_layout_channel_from_index(&s->channel_layout, s->map[i]);
|
|
|
|
if ((ret = av_channel_layout_from_mask(&channel_layout, 1ULL << channel)) < 0 ||
|
|
(ret = ff_add_channel_layout(&out_layouts, &channel_layout)) < 0 ||
|
|
(ret = ff_channel_layouts_ref(out_layouts, &ctx->outputs[i]->incfg.channel_layouts)) < 0)
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int filter_frame(AVFilterLink *outlink, AVFrame *buf)
|
|
{
|
|
AVFrame *buf_out;
|
|
AVFilterContext *ctx = outlink->src;
|
|
ChannelSplitContext *s = ctx->priv;
|
|
const int i = FF_OUTLINK_IDX(outlink);
|
|
enum AVChannel channel = av_channel_layout_channel_from_index(&buf->ch_layout, s->map[i]);
|
|
int ret;
|
|
|
|
av_assert1(channel >= 0);
|
|
|
|
buf_out = av_frame_clone(buf);
|
|
if (!buf_out)
|
|
return AVERROR(ENOMEM);
|
|
|
|
buf_out->data[0] = buf_out->extended_data[0] = buf_out->extended_data[s->map[i]];
|
|
ret = av_channel_layout_from_mask(&buf_out->ch_layout, 1ULL << channel);
|
|
if (ret < 0) {
|
|
av_frame_free(&buf_out);
|
|
return ret;
|
|
}
|
|
|
|
return ff_filter_frame(ctx->outputs[i], buf_out);
|
|
}
|
|
|
|
static int activate(AVFilterContext *ctx)
|
|
{
|
|
AVFilterLink *inlink = ctx->inputs[0];
|
|
int status, ret;
|
|
AVFrame *in;
|
|
int64_t pts;
|
|
|
|
for (int i = 0; i < ctx->nb_outputs; i++) {
|
|
FF_FILTER_FORWARD_STATUS_BACK_ALL(ctx->outputs[i], ctx);
|
|
}
|
|
|
|
ret = ff_inlink_consume_frame(inlink, &in);
|
|
if (ret < 0)
|
|
return ret;
|
|
if (ret > 0) {
|
|
for (int i = 0; i < ctx->nb_outputs; i++) {
|
|
if (ff_outlink_get_status(ctx->outputs[i]))
|
|
continue;
|
|
|
|
ret = filter_frame(ctx->outputs[i], in);
|
|
if (ret < 0)
|
|
break;
|
|
}
|
|
|
|
av_frame_free(&in);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
if (ff_inlink_acknowledge_status(inlink, &status, &pts)) {
|
|
for (int i = 0; i < ctx->nb_outputs; i++) {
|
|
if (ff_outlink_get_status(ctx->outputs[i]))
|
|
continue;
|
|
ff_outlink_set_status(ctx->outputs[i], status, pts);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
for (int i = 0; i < ctx->nb_outputs; i++) {
|
|
if (ff_outlink_get_status(ctx->outputs[i]))
|
|
continue;
|
|
|
|
if (ff_outlink_frame_wanted(ctx->outputs[i])) {
|
|
ff_inlink_request_frame(inlink);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
return FFERROR_NOT_READY;
|
|
}
|
|
|
|
const AVFilter ff_af_channelsplit = {
|
|
.name = "channelsplit",
|
|
.description = NULL_IF_CONFIG_SMALL("Split audio into per-channel streams."),
|
|
.priv_size = sizeof(ChannelSplitContext),
|
|
.priv_class = &channelsplit_class,
|
|
.init = init,
|
|
.activate = activate,
|
|
.uninit = uninit,
|
|
FILTER_INPUTS(ff_audio_default_filterpad),
|
|
.outputs = NULL,
|
|
FILTER_QUERY_FUNC(query_formats),
|
|
.flags = AVFILTER_FLAG_DYNAMIC_OUTPUTS,
|
|
};
|