| /* |
| * 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" |
| |
| 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 |
| #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 } |
| }; |
| |
| 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_ch) |
| { |
| 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_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 (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) < 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 || |
| 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); |
| } |
| |
| 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; |
| } |
| |
| 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_samplerates (ctx , ff_all_samplerates() )) < 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->channels; |
| 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_array(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])); |
| |
| buf->channel_layout = outlink->channel_layout; |
| buf->channels = outlink->channels; |
| |
| return ff_filter_frame(outlink, buf); |
| } |
| |
| static int channelmap_config_input(AVFilterLink *inlink) |
| { |
| AVFilterContext *ctx = inlink->dst; |
| ChannelMapContext *s = ctx->priv; |
| int nb_channels = inlink->channels; |
| 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), |
| nb_channels, 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; |
| } |
| |
| 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 ff_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, |
| }; |
