| /* |
| * 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), |
| }; |