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ffmpeg/libavfilter/af_channelmap.c

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/*
* Copyright (c) 2012 Google, Inc.
*
* 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
* audio channel mapping filter
*/
#include <ctype.h>
#include "libavutil/avstring.h"
#include "libavutil/channel_layout.h"
#include "libavutil/common.h"
#include "libavutil/mathematics.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "libavutil/samplefmt.h"
#include "audio.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
struct ChannelMap {
int in_channel;
int out_channel;
int in_channel_idx;
int out_channel_idx;
};
enum MappingMode {
MAP_NONE,
MAP_ONE_INT,
MAP_ONE_STR,
MAP_PAIR_INT_INT,
MAP_PAIR_INT_STR,
MAP_PAIR_STR_INT,
MAP_PAIR_STR_STR
};
#define MAX_CH 64
typedef struct ChannelMapContext {
const AVClass *class;
char *mapping_str;
AVChannelLayout output_layout;
struct ChannelMap map[MAX_CH];
int nch;
enum MappingMode mode;
} ChannelMapContext;
#define OFFSET(x) offsetof(ChannelMapContext, x)
#define A AV_OPT_FLAG_AUDIO_PARAM
#define F AV_OPT_FLAG_FILTERING_PARAM
static const AVOption channelmap_options[] = {
{ "map", "A comma-separated list of input channel numbers in output order.",
OFFSET(mapping_str), AV_OPT_TYPE_STRING, .flags = A|F },
{ "channel_layout", "Output channel layout.",
OFFSET(output_layout), AV_OPT_TYPE_CHLAYOUT, .flags = A|F },
{ NULL }
};
AVFILTER_DEFINE_CLASS(channelmap);
static char* split(char *message, char delim) {
char *next = strchr(message, delim);
if (next)
*next++ = '\0';
return next;
}
static int get_channel_idx(char **map, int *ch, char delim, int max_nb_channels)
{
char *next;
int len;
int n = 0;
if (!*map)
return AVERROR(EINVAL);
next = split(*map, delim);
if (!next && delim == '-')
return AVERROR(EINVAL);
len = strlen(*map);
sscanf(*map, "%d%n", ch, &n);
if (n != len)
return AVERROR(EINVAL);
if (*ch < 0 || *ch >= max_nb_channels)
return AVERROR(EINVAL);
*map = next;
return 0;
}
static int get_channel(char **map, int *ch, char delim)
{
char *next = split(*map, delim);
if (!next && delim == '-')
return AVERROR(EINVAL);
*ch = av_channel_from_string(*map);
if (*ch < 0)
return AVERROR(EINVAL);
*map = next;
return 0;
}
static int check_idx_and_id(AVFilterContext *ctx, int channel_idx, int channel, AVChannelLayout *ch_layout, const char *io)
{
char channel_name[64];
char layout_name[256];
int nb_channels = ch_layout->nb_channels;
if (channel_idx < 0 || channel_idx >= nb_channels) {
av_channel_layout_describe(ch_layout, layout_name, sizeof(layout_name));
if (channel >= 0) {
av_channel_name(channel_name, sizeof(channel_name), channel);
av_log(ctx, AV_LOG_ERROR,
"%sput channel '%s' not available from %sput layout '%s'\n",
io, channel_name, io, layout_name);
} else {
av_log(ctx, AV_LOG_ERROR,
"%sput channel #%d not available from %sput layout '%s'\n",
io, channel_idx, io, layout_name);
}
return AVERROR(EINVAL);
}
return 0;
}
static av_cold int channelmap_init(AVFilterContext *ctx)
{
ChannelMapContext *s = ctx->priv;
char *mapping, separator = '|';
int map_entries = 0;
enum MappingMode mode;
int64_t out_ch_mask = 0;
uint64_t presence_mask;
int i;
mapping = s->mapping_str;
if (!mapping) {
mode = MAP_NONE;
} else {
char *dash = strchr(mapping, '-');
if (!dash) { // short mapping
if (av_isdigit(*mapping))
mode = MAP_ONE_INT;
else
mode = MAP_ONE_STR;
} else if (av_isdigit(*mapping)) {
if (av_isdigit(*(dash+1)))
mode = MAP_PAIR_INT_INT;
else
mode = MAP_PAIR_INT_STR;
} else {
if (av_isdigit(*(dash+1)))
mode = MAP_PAIR_STR_INT;
else
mode = MAP_PAIR_STR_STR;
}
}
if (mode != MAP_NONE) {
char *sep = mapping;
map_entries = 1;
while ((sep = strchr(sep, separator))) {
if (*++sep) // Allow trailing comma
map_entries++;
}
}
if (map_entries > MAX_CH) {
av_log(ctx, AV_LOG_ERROR, "Too many channels mapped: '%d'.\n", map_entries);
return AVERROR(EINVAL);
}
for (i = 0; i < MAX_CH; i++) {
s->map[i].in_channel_idx = -1;
s->map[i].out_channel_idx = -1;
s->map[i].in_channel = -1;
s->map[i].out_channel = -1;
}
for (i = 0; i < map_entries; i++) {
int in_ch_idx = -1, out_ch_idx = -1;
int in_ch = -1, out_ch = -1;
static const char err[] = "Failed to parse channel map\n";
switch (mode) {
case MAP_ONE_INT:
if (get_channel_idx(&mapping, &in_ch_idx, separator, MAX_CH) < 0) {
av_log(ctx, AV_LOG_ERROR, err);
return AVERROR(EINVAL);
}
s->map[i].in_channel_idx = in_ch_idx;
s->map[i].out_channel_idx = i;
break;
case MAP_ONE_STR:
if (get_channel(&mapping, &in_ch, separator) < 0) {
av_log(ctx, AV_LOG_ERROR, err);
return AVERROR(EINVAL);
}
s->map[i].in_channel = in_ch;
s->map[i].out_channel_idx = i;
break;
case MAP_PAIR_INT_INT:
if (get_channel_idx(&mapping, &in_ch_idx, '-', MAX_CH) < 0 ||
get_channel_idx(&mapping, &out_ch_idx, separator, MAX_CH) < 0) {
av_log(ctx, AV_LOG_ERROR, err);
return AVERROR(EINVAL);
}
s->map[i].in_channel_idx = in_ch_idx;
s->map[i].out_channel_idx = out_ch_idx;
break;
case MAP_PAIR_INT_STR:
if (get_channel_idx(&mapping, &in_ch_idx, '-', MAX_CH) < 0 ||
get_channel(&mapping, &out_ch, separator) < 0) {
av_log(ctx, AV_LOG_ERROR, err);
return AVERROR(EINVAL);
}
s->map[i].in_channel_idx = in_ch_idx;
s->map[i].out_channel = out_ch;
if (out_ch < 63)
out_ch_mask |= 1ULL << out_ch;
else
out_ch_mask = -1;
break;
case MAP_PAIR_STR_INT:
if (get_channel(&mapping, &in_ch, '-') < 0 ||
get_channel_idx(&mapping, &out_ch_idx, separator, MAX_CH) < 0) {
av_log(ctx, AV_LOG_ERROR, err);
return AVERROR(EINVAL);
}
s->map[i].in_channel = in_ch;
s->map[i].out_channel_idx = out_ch_idx;
break;
case MAP_PAIR_STR_STR:
if (get_channel(&mapping, &in_ch, '-') < 0 ||
get_channel(&mapping, &out_ch, separator) < 0) {
av_log(ctx, AV_LOG_ERROR, err);
return AVERROR(EINVAL);
}
s->map[i].in_channel = in_ch;
s->map[i].out_channel = out_ch;
if (out_ch < 63)
out_ch_mask |= 1ULL << out_ch;
else
out_ch_mask = -1;
break;
}
}
s->mode = mode;
s->nch = map_entries;
if (s->output_layout.nb_channels == 0) {
if (out_ch_mask > 0)
av_channel_layout_from_mask(&s->output_layout, out_ch_mask);
else if (map_entries)
av_channel_layout_default(&s->output_layout, map_entries);
}
if (mode == MAP_NONE) {
int i;
s->nch = s->output_layout.nb_channels;
for (i = 0; i < s->nch; i++) {
s->map[i].in_channel_idx = i;
s->map[i].out_channel_idx = i;
}
} else if (s->nch != s->output_layout.nb_channels) {
char buf[256];
av_channel_layout_describe(&s->output_layout, buf, sizeof(buf));
av_log(ctx, AV_LOG_ERROR,
"Output channel layout %s does not match the number of channels mapped %d.\n",
buf, s->nch);
return AVERROR(EINVAL);
}
if (!s->output_layout.nb_channels) {
av_log(ctx, AV_LOG_ERROR, "Output channel layout is not set and "
"cannot be guessed from the maps.\n");
return AVERROR(EINVAL);
}
if (mode == MAP_PAIR_INT_STR || mode == MAP_PAIR_STR_STR) {
for (i = 0; i < s->nch; i++) {
s->map[i].out_channel_idx = av_channel_layout_index_from_channel(
&s->output_layout, s->map[i].out_channel);
}
}
presence_mask = 0;
for (i = 0; i < s->nch; i++) {
uint64_t idx_mask;
int ret = check_idx_and_id(ctx, s->map[i].out_channel_idx, s->map[i].out_channel, &s->output_layout, "out");
if (ret < 0)
return ret;
idx_mask = (1ULL << s->map[i].out_channel_idx);
if (presence_mask & idx_mask) {
char layout_name[256];
av_channel_layout_describe(&s->output_layout, layout_name, sizeof(layout_name));
av_log(ctx, AV_LOG_ERROR, "Mapping %d assigns channel #%d twice in output layout '%s'.\n",
i + 1, s->map[i].out_channel_idx, layout_name);
return AVERROR(EINVAL);
}
presence_mask |= idx_mask;
}
return 0;
}
static int channelmap_query_formats(AVFilterContext *ctx)
{
ChannelMapContext *s = ctx->priv;
AVFilterChannelLayouts *channel_layouts = NULL;
int ret;
if ((ret = ff_set_common_formats (ctx, ff_planar_sample_fmts())) < 0 ||
(ret = ff_set_common_all_samplerates(ctx )) < 0 ||
(ret = ff_add_channel_layout(&channel_layouts, &s->output_layout)) < 0 ||
(ret = ff_channel_layouts_ref(channel_layouts,
&ctx->outputs[0]->incfg.channel_layouts)) < 0)
return ret;
return ff_channel_layouts_ref(ff_all_channel_counts(),
&ctx->inputs[0]->outcfg.channel_layouts);
}
static int channelmap_filter_frame(AVFilterLink *inlink, AVFrame *buf)
{
AVFilterContext *ctx = inlink->dst;
AVFilterLink *outlink = ctx->outputs[0];
const ChannelMapContext *s = ctx->priv;
const int nch_in = inlink->ch_layout.nb_channels;
const int nch_out = s->nch;
int ch, ret;
uint8_t *source_planes[MAX_CH];
memcpy(source_planes, buf->extended_data,
nch_in * sizeof(source_planes[0]));
if (nch_out > nch_in) {
if (nch_out > FF_ARRAY_ELEMS(buf->data)) {
uint8_t **new_extended_data =
av_calloc(nch_out, sizeof(*buf->extended_data));
if (!new_extended_data) {
av_frame_free(&buf);
return AVERROR(ENOMEM);
}
if (buf->extended_data == buf->data) {
buf->extended_data = new_extended_data;
} else {
av_free(buf->extended_data);
buf->extended_data = new_extended_data;
}
} else if (buf->extended_data != buf->data) {
av_free(buf->extended_data);
buf->extended_data = buf->data;
}
}
for (ch = 0; ch < nch_out; ch++) {
buf->extended_data[s->map[ch].out_channel_idx] =
source_planes[s->map[ch].in_channel_idx];
}
if (buf->data != buf->extended_data)
memcpy(buf->data, buf->extended_data,
FFMIN(FF_ARRAY_ELEMS(buf->data), nch_out) * sizeof(buf->data[0]));
if ((ret = av_channel_layout_copy(&buf->ch_layout, &outlink->ch_layout)) < 0)
return ret;
return ff_filter_frame(outlink, buf);
}
static int channelmap_config_input(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
ChannelMapContext *s = ctx->priv;
int i, err = 0;
for (i = 0; i < s->nch; i++) {
struct ChannelMap *m = &s->map[i];
if (s->mode == MAP_PAIR_STR_INT || s->mode == MAP_PAIR_STR_STR || s->mode == MAP_ONE_STR) {
m->in_channel_idx = av_channel_layout_index_from_channel(
&inlink->ch_layout, m->in_channel);
}
if (check_idx_and_id(ctx, m->in_channel_idx, m->in_channel, &inlink->ch_layout, "in") < 0)
err = AVERROR(EINVAL);
}
return err;
}
static const AVFilterPad avfilter_af_channelmap_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_AUDIO,
.flags = AVFILTERPAD_FLAG_NEEDS_WRITABLE,
.filter_frame = channelmap_filter_frame,
.config_props = channelmap_config_input,
},
};
const AVFilter ff_af_channelmap = {
.name = "channelmap",
.description = NULL_IF_CONFIG_SMALL("Remap audio channels."),
.init = channelmap_init,
.priv_size = sizeof(ChannelMapContext),
.priv_class = &channelmap_class,
FILTER_INPUTS(avfilter_af_channelmap_inputs),
FILTER_OUTPUTS(ff_audio_default_filterpad),
FILTER_QUERY_FUNC(channelmap_query_formats),
};
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