41e637e4 |
/*
* Copyright (c) 2012 Google, Inc.
* |
1c600888 |
* This file is part of FFmpeg. |
41e637e4 |
* |
1c600888 |
* FFmpeg is free software; you can redistribute it and/or |
41e637e4 |
* 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.
* |
1c600888 |
* FFmpeg is distributed in the hope that it will be useful, |
41e637e4 |
* 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 |
1c600888 |
* License along with FFmpeg; if not, write to the Free Software |
41e637e4 |
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* audio channel mapping filter
*/
#include <ctype.h>
#include "libavutil/avstring.h" |
a903f8f0 |
#include "libavutil/channel_layout.h" |
1d9c2dc8 |
#include "libavutil/common.h" |
41e637e4 |
#include "libavutil/mathematics.h"
#include "libavutil/opt.h"
#include "libavutil/samplefmt.h"
#include "audio.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
struct ChannelMap {
uint64_t in_channel;
uint64_t 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;
char *channel_layout_str;
uint64_t 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 |
42d621d1 |
#define F AV_OPT_FLAG_FILTERING_PARAM |
beda4188 |
static const AVOption channelmap_options[] = { |
41e637e4 |
{ "map", "A comma-separated list of input channel numbers in output order.", |
42d621d1 |
OFFSET(mapping_str), AV_OPT_TYPE_STRING, .flags = A|F }, |
41e637e4 |
{ "channel_layout", "Output channel layout.", |
42d621d1 |
OFFSET(channel_layout_str), AV_OPT_TYPE_STRING, .flags = A|F }, |
b211607b |
{ NULL } |
41e637e4 |
};
|
beda4188 |
AVFILTER_DEFINE_CLASS(channelmap); |
41e637e4 |
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_ch)
{ |
9f6431c8 |
char *next; |
41e637e4 |
int len;
int n = 0; |
579795b2 |
if (!*map)
return AVERROR(EINVAL); |
9f6431c8 |
next = split(*map, delim);
if (!next && delim == '-')
return AVERROR(EINVAL); |
41e637e4 |
len = strlen(*map);
sscanf(*map, "%d%n", ch, &n);
if (n != len)
return AVERROR(EINVAL);
if (*ch < 0 || *ch > max_ch)
return AVERROR(EINVAL);
*map = next;
return 0;
}
static int get_channel(char **map, uint64_t *ch, char delim)
{
char *next = split(*map, delim);
if (!next && delim == '-')
return AVERROR(EINVAL);
*ch = av_get_channel_layout(*map);
if (av_get_channel_layout_nb_channels(*ch) != 1)
return AVERROR(EINVAL);
*map = next;
return 0;
}
|
d69a4177 |
static av_cold int channelmap_init(AVFilterContext *ctx) |
41e637e4 |
{
ChannelMapContext *s = ctx->priv; |
ba8efac9 |
char *mapping, separator = '|'; |
41e637e4 |
int map_entries = 0;
char buf[256];
enum MappingMode mode;
uint64_t out_ch_mask = 0;
int i;
mapping = s->mapping_str;
if (!mapping) {
mode = MAP_NONE;
} else {
char *dash = strchr(mapping, '-');
if (!dash) { // short mapping |
efa7f420 |
if (av_isdigit(*mapping)) |
41e637e4 |
mode = MAP_ONE_INT;
else
mode = MAP_ONE_STR; |
efa7f420 |
} else if (av_isdigit(*mapping)) {
if (av_isdigit(*(dash+1))) |
41e637e4 |
mode = MAP_PAIR_INT_INT;
else
mode = MAP_PAIR_INT_STR;
} else { |
efa7f420 |
if (av_isdigit(*(dash+1))) |
41e637e4 |
mode = MAP_PAIR_STR_INT;
else
mode = MAP_PAIR_STR_STR;
}
}
if (mode != MAP_NONE) { |
ba8efac9 |
char *sep = mapping; |
41e637e4 |
map_entries = 1; |
ba8efac9 |
while ((sep = strchr(sep, separator))) {
if (*++sep) // Allow trailing comma |
41e637e4 |
map_entries++;
}
}
if (map_entries > MAX_CH) {
av_log(ctx, AV_LOG_ERROR, "Too many channels mapped: '%d'.\n", map_entries); |
949c603e |
return AVERROR(EINVAL); |
41e637e4 |
}
for (i = 0; i < map_entries; i++) {
int in_ch_idx = -1, out_ch_idx = -1;
uint64_t in_ch = 0, out_ch = 0;
static const char err[] = "Failed to parse channel map\n";
switch (mode) {
case MAP_ONE_INT: |
ba8efac9 |
if (get_channel_idx(&mapping, &in_ch_idx, separator, MAX_CH) < 0) { |
41e637e4 |
av_log(ctx, AV_LOG_ERROR, err); |
949c603e |
return AVERROR(EINVAL); |
41e637e4 |
}
s->map[i].in_channel_idx = in_ch_idx;
s->map[i].out_channel_idx = i;
break;
case MAP_ONE_STR: |
e8436126 |
if (get_channel(&mapping, &in_ch, separator) < 0) { |
41e637e4 |
av_log(ctx, AV_LOG_ERROR, err); |
949c603e |
return AVERROR(EINVAL); |
41e637e4 |
}
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 || |
ba8efac9 |
get_channel_idx(&mapping, &out_ch_idx, separator, MAX_CH) < 0) { |
41e637e4 |
av_log(ctx, AV_LOG_ERROR, err); |
949c603e |
return AVERROR(EINVAL); |
41e637e4 |
}
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 || |
ba8efac9 |
get_channel(&mapping, &out_ch, separator) < 0 || |
41e637e4 |
out_ch & out_ch_mask) {
av_log(ctx, AV_LOG_ERROR, err); |
949c603e |
return AVERROR(EINVAL); |
41e637e4 |
}
s->map[i].in_channel_idx = in_ch_idx;
s->map[i].out_channel = out_ch;
out_ch_mask |= out_ch;
break;
case MAP_PAIR_STR_INT:
if (get_channel(&mapping, &in_ch, '-') < 0 || |
ba8efac9 |
get_channel_idx(&mapping, &out_ch_idx, separator, MAX_CH) < 0) { |
41e637e4 |
av_log(ctx, AV_LOG_ERROR, err); |
949c603e |
return AVERROR(EINVAL); |
41e637e4 |
}
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 || |
ba8efac9 |
get_channel(&mapping, &out_ch, separator) < 0 || |
41e637e4 |
out_ch & out_ch_mask) {
av_log(ctx, AV_LOG_ERROR, err); |
949c603e |
return AVERROR(EINVAL); |
41e637e4 |
}
s->map[i].in_channel = in_ch;
s->map[i].out_channel = out_ch;
out_ch_mask |= out_ch;
break;
}
}
s->mode = mode;
s->nch = map_entries;
s->output_layout = out_ch_mask ? out_ch_mask :
av_get_default_channel_layout(map_entries);
if (s->channel_layout_str) {
uint64_t fmt;
if ((fmt = av_get_channel_layout(s->channel_layout_str)) == 0) {
av_log(ctx, AV_LOG_ERROR, "Error parsing channel layout: '%s'.\n",
s->channel_layout_str); |
949c603e |
return AVERROR(EINVAL); |
41e637e4 |
}
if (mode == MAP_NONE) {
int i;
s->nch = av_get_channel_layout_nb_channels(fmt);
for (i = 0; i < s->nch; i++) {
s->map[i].in_channel_idx = i;
s->map[i].out_channel_idx = i;
}
} else if (out_ch_mask && out_ch_mask != fmt) {
av_get_channel_layout_string(buf, sizeof(buf), 0, out_ch_mask);
av_log(ctx, AV_LOG_ERROR,
"Output channel layout '%s' does not match the list of channel mapped: '%s'.\n",
s->channel_layout_str, buf); |
949c603e |
return AVERROR(EINVAL); |
41e637e4 |
} else if (s->nch != av_get_channel_layout_nb_channels(fmt)) {
av_log(ctx, AV_LOG_ERROR,
"Output channel layout %s does not match the number of channels mapped %d.\n",
s->channel_layout_str, s->nch); |
949c603e |
return AVERROR(EINVAL); |
41e637e4 |
}
s->output_layout = fmt;
} |
8aaab111 |
if (!s->output_layout) {
av_log(ctx, AV_LOG_ERROR, "Output channel layout is not set and "
"cannot be guessed from the maps.\n");
return AVERROR(EINVAL);
}
|
41e637e4 |
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_get_channel_layout_channel_index(
s->output_layout, s->map[i].out_channel);
}
}
|
949c603e |
return 0; |
41e637e4 |
}
static int channelmap_query_formats(AVFilterContext *ctx)
{
ChannelMapContext *s = ctx->priv; |
32288234 |
AVFilterChannelLayouts *layouts; |
22ecfcd4 |
AVFilterChannelLayouts *channel_layouts = NULL; |
6aaac24d |
int ret; |
22ecfcd4 |
|
01a19f77 |
layouts = ff_all_channel_counts(); |
924fcac5 |
if (!layouts) {
ret = AVERROR(ENOMEM);
goto fail;
} |
6aaac24d |
if ((ret = ff_add_channel_layout (&channel_layouts, s->output_layout )) < 0 ||
(ret = ff_set_common_formats (ctx , ff_planar_sample_fmts() )) < 0 ||
(ret = ff_set_common_samplerates (ctx , ff_all_samplerates() )) < 0 ||
(ret = ff_channel_layouts_ref (layouts , &ctx->inputs[0]->out_channel_layouts)) < 0 ||
(ret = ff_channel_layouts_ref (channel_layouts , &ctx->outputs[0]->in_channel_layouts)) < 0) |
924fcac5 |
goto fail; |
41e637e4 |
return 0; |
924fcac5 |
fail:
if (layouts)
av_freep(&layouts->channel_layouts);
av_freep(&layouts);
return ret; |
41e637e4 |
}
|
7e350379 |
static int channelmap_filter_frame(AVFilterLink *inlink, AVFrame *buf) |
41e637e4 |
{
AVFilterContext *ctx = inlink->dst;
AVFilterLink *outlink = ctx->outputs[0];
const ChannelMapContext *s = ctx->priv; |
01a19f77 |
const int nch_in = inlink->channels; |
41e637e4 |
const int nch_out = s->nch;
int ch;
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 = |
a62814ab |
av_mallocz_array(nch_out, sizeof(*buf->extended_data)); |
cd991462 |
if (!new_extended_data) { |
7e350379 |
av_frame_free(&buf); |
cd991462 |
return AVERROR(ENOMEM);
} |
41e637e4 |
if (buf->extended_data == buf->data) {
buf->extended_data = new_extended_data;
} else {
av_free(buf->extended_data); |
1afd7a11 |
buf->extended_data = new_extended_data; |
41e637e4 |
}
} 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]));
|
f0e95948 |
buf->channel_layout = outlink->channel_layout; |
6af050d7 |
buf->channels = outlink->channels; |
f0e95948 |
|
cd7febd3 |
return ff_filter_frame(outlink, buf); |
41e637e4 |
}
static int channelmap_config_input(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
ChannelMapContext *s = ctx->priv; |
01a19f77 |
int nb_channels = inlink->channels; |
41e637e4 |
int i, err = 0;
const char *channel_name;
char layout_name[256];
|
aafed117 |
for (i = 0; i < s->nch; i++) { |
c0771a1a |
struct ChannelMap *m = &s->map[i];
|
aafed117 |
if (s->mode == MAP_PAIR_STR_INT || s->mode == MAP_PAIR_STR_STR) { |
c0771a1a |
m->in_channel_idx = av_get_channel_layout_channel_index(
inlink->channel_layout, m->in_channel); |
aafed117 |
}
|
c0771a1a |
if (m->in_channel_idx < 0 || m->in_channel_idx >= nb_channels) { |
aafed117 |
av_get_channel_layout_string(layout_name, sizeof(layout_name), |
01a19f77 |
nb_channels, inlink->channel_layout); |
c0771a1a |
if (m->in_channel) {
channel_name = av_get_channel_name(m->in_channel); |
41e637e4 |
av_log(ctx, AV_LOG_ERROR,
"input channel '%s' not available from input layout '%s'\n",
channel_name, layout_name); |
aafed117 |
} else {
av_log(ctx, AV_LOG_ERROR,
"input channel #%d not available from input layout '%s'\n", |
c0771a1a |
m->in_channel_idx, layout_name); |
41e637e4 |
} |
aafed117 |
err = AVERROR(EINVAL); |
41e637e4 |
}
}
return err;
}
|
568c70e7 |
static const AVFilterPad avfilter_af_channelmap_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_AUDIO, |
cd7febd3 |
.filter_frame = channelmap_filter_frame, |
96e4b00d |
.config_props = channelmap_config_input,
.needs_writable = 1, |
568c70e7 |
},
{ NULL }
};
static const AVFilterPad avfilter_af_channelmap_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_AUDIO
},
{ NULL }
};
|
cd43ca04 |
AVFilter ff_af_channelmap = { |
41e637e4 |
.name = "channelmap",
.description = NULL_IF_CONFIG_SMALL("Remap audio channels."),
.init = channelmap_init,
.query_formats = channelmap_query_formats,
.priv_size = sizeof(ChannelMapContext), |
ba8efac9 |
.priv_class = &channelmap_class, |
568c70e7 |
.inputs = avfilter_af_channelmap_inputs,
.outputs = avfilter_af_channelmap_outputs, |
41e637e4 |
}; |