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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/opt.h" |
#include "libavutil/samplefmt.h" |
|
#include "audio.h" |
#include "avfilter.h" |
#include "formats.h" |
#include "internal.h" |
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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; |
AVFilterChannelLayouts *channel_layouts; |
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 |
#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(channel_layout_str), AV_OPT_TYPE_STRING, .flags = A|F }, |
{ NULL } |
}; |
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AVFILTER_DEFINE_CLASS(channelmap); |
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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) |
{ |
char *next = split(*map, delim); |
int len; |
int n = 0; |
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_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; |
} |
|
static av_cold int channelmap_init(AVFilterContext *ctx) |
{ |
ChannelMapContext *s = ctx->priv; |
char *mapping, separator = '|'; |
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 |
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 FF_API_OLD_FILTER_OPTS |
if (strchr(mapping, ',')) { |
av_log(ctx, AV_LOG_WARNING, "This syntax is deprecated, use " |
"'|' to separate the mappings.\n"); |
separator = ','; |
} |
#endif |
} |
|
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 < 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: |
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)) { |
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 || |
out_ch & out_ch_mask) { |
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; |
out_ch_mask |= out_ch; |
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 || |
out_ch & out_ch_mask) { |
av_log(ctx, AV_LOG_ERROR, err); |
return AVERROR(EINVAL); |
} |
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); |
return AVERROR(EINVAL); |
} |
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); |
return AVERROR(EINVAL); |
} 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); |
return AVERROR(EINVAL); |
} |
s->output_layout = fmt; |
} |
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); |
} |
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ff_add_channel_layout(&s->channel_layouts, s->output_layout); |
|
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); |
} |
} |
|
return 0; |
} |
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static int channelmap_query_formats(AVFilterContext *ctx) |
{ |
ChannelMapContext *s = ctx->priv; |
|
ff_set_common_formats(ctx, ff_planar_sample_fmts()); |
ff_set_common_samplerates(ctx, ff_all_samplerates()); |
ff_channel_layouts_ref(ff_all_channel_layouts(), &ctx->inputs[0]->out_channel_layouts); |
ff_channel_layouts_ref(s->channel_layouts, &ctx->outputs[0]->in_channel_layouts); |
|
return 0; |
} |
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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 = av_get_channel_layout_nb_channels(inlink->channel_layout); |
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 = |
av_mallocz(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; |
} |
} |
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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])); |
|
return ff_filter_frame(outlink, buf); |
} |
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static int channelmap_config_input(AVFilterLink *inlink) |
{ |
AVFilterContext *ctx = inlink->dst; |
ChannelMapContext *s = ctx->priv; |
int nb_channels = av_get_channel_layout_nb_channels(inlink->channel_layout); |
int i, err = 0; |
const char *channel_name; |
char layout_name[256]; |
|
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) { |
m->in_channel_idx = av_get_channel_layout_channel_index( |
inlink->channel_layout, m->in_channel); |
} |
|
if (m->in_channel_idx < 0 || m->in_channel_idx >= nb_channels) { |
av_get_channel_layout_string(layout_name, sizeof(layout_name), |
0, inlink->channel_layout); |
if (m->in_channel) { |
channel_name = av_get_channel_name(m->in_channel); |
av_log(ctx, AV_LOG_ERROR, |
"input channel '%s' not available from input layout '%s'\n", |
channel_name, layout_name); |
} else { |
av_log(ctx, AV_LOG_ERROR, |
"input channel #%d not available from input layout '%s'\n", |
m->in_channel_idx, layout_name); |
} |
err = AVERROR(EINVAL); |
} |
} |
|
return err; |
} |
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static const AVFilterPad avfilter_af_channelmap_inputs[] = { |
{ |
.name = "default", |
.type = AVMEDIA_TYPE_AUDIO, |
.filter_frame = channelmap_filter_frame, |
.config_props = channelmap_config_input, |
.needs_writable = 1, |
}, |
{ NULL } |
}; |
|
static const AVFilterPad avfilter_af_channelmap_outputs[] = { |
{ |
.name = "default", |
.type = AVMEDIA_TYPE_AUDIO |
}, |
{ NULL } |
}; |
|
AVFilter avfilter_af_channelmap = { |
.name = "channelmap", |
.description = NULL_IF_CONFIG_SMALL("Remap audio channels."), |
.init = channelmap_init, |
.query_formats = channelmap_query_formats, |
.priv_size = sizeof(ChannelMapContext), |
.priv_class = &channelmap_class, |
.inputs = avfilter_af_channelmap_inputs, |
.outputs = avfilter_af_channelmap_outputs, |
}; |