411 lines
13 KiB
C
411 lines
13 KiB
C
/*
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* Copyright (c) 2012 Google, Inc.
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* audio channel mapping filter
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*/
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#include <ctype.h>
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#include "libavutil/avstring.h"
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#include "libavutil/channel_layout.h"
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#include "libavutil/common.h"
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#include "libavutil/mathematics.h"
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#include "libavutil/opt.h"
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#include "libavutil/samplefmt.h"
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#include "audio.h"
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#include "avfilter.h"
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#include "formats.h"
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#include "internal.h"
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struct ChannelMap {
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uint64_t in_channel;
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uint64_t out_channel;
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int in_channel_idx;
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int out_channel_idx;
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};
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enum MappingMode {
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MAP_NONE,
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MAP_ONE_INT,
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MAP_ONE_STR,
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MAP_PAIR_INT_INT,
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MAP_PAIR_INT_STR,
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MAP_PAIR_STR_INT,
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MAP_PAIR_STR_STR
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};
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#define MAX_CH 64
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typedef struct ChannelMapContext {
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const AVClass *class;
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char *mapping_str;
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char *channel_layout_str;
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uint64_t output_layout;
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struct ChannelMap map[MAX_CH];
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int nch;
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enum MappingMode mode;
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} ChannelMapContext;
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#define OFFSET(x) offsetof(ChannelMapContext, x)
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#define A AV_OPT_FLAG_AUDIO_PARAM
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#define F AV_OPT_FLAG_FILTERING_PARAM
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static const AVOption channelmap_options[] = {
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{ "map", "A comma-separated list of input channel numbers in output order.",
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OFFSET(mapping_str), AV_OPT_TYPE_STRING, .flags = A|F },
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{ "channel_layout", "Output channel layout.",
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OFFSET(channel_layout_str), AV_OPT_TYPE_STRING, .flags = A|F },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(channelmap);
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static char* split(char *message, char delim) {
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char *next = strchr(message, delim);
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if (next)
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*next++ = '\0';
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return next;
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}
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static int get_channel_idx(char **map, int *ch, char delim, int max_ch)
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{
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char *next;
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int len;
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int n = 0;
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if (!*map)
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return AVERROR(EINVAL);
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next = split(*map, delim);
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if (!next && delim == '-')
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return AVERROR(EINVAL);
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len = strlen(*map);
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sscanf(*map, "%d%n", ch, &n);
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if (n != len)
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return AVERROR(EINVAL);
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if (*ch < 0 || *ch > max_ch)
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return AVERROR(EINVAL);
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*map = next;
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return 0;
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}
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static int get_channel(char **map, uint64_t *ch, char delim)
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{
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char *next = split(*map, delim);
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if (!next && delim == '-')
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return AVERROR(EINVAL);
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*ch = av_get_channel_layout(*map);
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if (av_get_channel_layout_nb_channels(*ch) != 1)
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return AVERROR(EINVAL);
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*map = next;
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return 0;
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}
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static av_cold int channelmap_init(AVFilterContext *ctx)
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{
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ChannelMapContext *s = ctx->priv;
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char *mapping, separator = '|';
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int map_entries = 0;
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char buf[256];
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enum MappingMode mode;
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uint64_t out_ch_mask = 0;
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int i;
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mapping = s->mapping_str;
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if (!mapping) {
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mode = MAP_NONE;
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} else {
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char *dash = strchr(mapping, '-');
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if (!dash) { // short mapping
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if (av_isdigit(*mapping))
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mode = MAP_ONE_INT;
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else
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mode = MAP_ONE_STR;
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} else if (av_isdigit(*mapping)) {
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if (av_isdigit(*(dash+1)))
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mode = MAP_PAIR_INT_INT;
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else
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mode = MAP_PAIR_INT_STR;
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} else {
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if (av_isdigit(*(dash+1)))
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mode = MAP_PAIR_STR_INT;
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else
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mode = MAP_PAIR_STR_STR;
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}
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}
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if (mode != MAP_NONE) {
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char *sep = mapping;
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map_entries = 1;
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while ((sep = strchr(sep, separator))) {
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if (*++sep) // Allow trailing comma
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map_entries++;
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}
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}
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if (map_entries > MAX_CH) {
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av_log(ctx, AV_LOG_ERROR, "Too many channels mapped: '%d'.\n", map_entries);
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return AVERROR(EINVAL);
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}
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for (i = 0; i < map_entries; i++) {
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int in_ch_idx = -1, out_ch_idx = -1;
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uint64_t in_ch = 0, out_ch = 0;
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static const char err[] = "Failed to parse channel map\n";
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switch (mode) {
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case MAP_ONE_INT:
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if (get_channel_idx(&mapping, &in_ch_idx, separator, MAX_CH) < 0) {
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av_log(ctx, AV_LOG_ERROR, err);
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return AVERROR(EINVAL);
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}
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s->map[i].in_channel_idx = in_ch_idx;
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s->map[i].out_channel_idx = i;
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break;
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case MAP_ONE_STR:
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if (get_channel(&mapping, &in_ch, separator) < 0) {
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av_log(ctx, AV_LOG_ERROR, err);
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return AVERROR(EINVAL);
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}
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s->map[i].in_channel = in_ch;
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s->map[i].out_channel_idx = i;
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break;
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case MAP_PAIR_INT_INT:
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if (get_channel_idx(&mapping, &in_ch_idx, '-', MAX_CH) < 0 ||
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get_channel_idx(&mapping, &out_ch_idx, separator, MAX_CH) < 0) {
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av_log(ctx, AV_LOG_ERROR, err);
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return AVERROR(EINVAL);
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}
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s->map[i].in_channel_idx = in_ch_idx;
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s->map[i].out_channel_idx = out_ch_idx;
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break;
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case MAP_PAIR_INT_STR:
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if (get_channel_idx(&mapping, &in_ch_idx, '-', MAX_CH) < 0 ||
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get_channel(&mapping, &out_ch, separator) < 0 ||
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out_ch & out_ch_mask) {
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av_log(ctx, AV_LOG_ERROR, err);
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return AVERROR(EINVAL);
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}
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s->map[i].in_channel_idx = in_ch_idx;
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s->map[i].out_channel = out_ch;
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out_ch_mask |= out_ch;
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break;
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case MAP_PAIR_STR_INT:
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if (get_channel(&mapping, &in_ch, '-') < 0 ||
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get_channel_idx(&mapping, &out_ch_idx, separator, MAX_CH) < 0) {
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av_log(ctx, AV_LOG_ERROR, err);
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return AVERROR(EINVAL);
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}
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s->map[i].in_channel = in_ch;
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s->map[i].out_channel_idx = out_ch_idx;
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break;
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case MAP_PAIR_STR_STR:
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if (get_channel(&mapping, &in_ch, '-') < 0 ||
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get_channel(&mapping, &out_ch, separator) < 0 ||
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out_ch & out_ch_mask) {
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av_log(ctx, AV_LOG_ERROR, err);
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return AVERROR(EINVAL);
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}
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s->map[i].in_channel = in_ch;
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s->map[i].out_channel = out_ch;
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out_ch_mask |= out_ch;
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break;
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}
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}
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s->mode = mode;
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s->nch = map_entries;
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s->output_layout = out_ch_mask ? out_ch_mask :
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av_get_default_channel_layout(map_entries);
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if (s->channel_layout_str) {
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uint64_t fmt;
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if ((fmt = av_get_channel_layout(s->channel_layout_str)) == 0) {
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av_log(ctx, AV_LOG_ERROR, "Error parsing channel layout: '%s'.\n",
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s->channel_layout_str);
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return AVERROR(EINVAL);
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}
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if (mode == MAP_NONE) {
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int i;
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s->nch = av_get_channel_layout_nb_channels(fmt);
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for (i = 0; i < s->nch; i++) {
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s->map[i].in_channel_idx = i;
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s->map[i].out_channel_idx = i;
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}
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} else if (out_ch_mask && out_ch_mask != fmt) {
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av_get_channel_layout_string(buf, sizeof(buf), 0, out_ch_mask);
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av_log(ctx, AV_LOG_ERROR,
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"Output channel layout '%s' does not match the list of channel mapped: '%s'.\n",
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s->channel_layout_str, buf);
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return AVERROR(EINVAL);
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} else if (s->nch != av_get_channel_layout_nb_channels(fmt)) {
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av_log(ctx, AV_LOG_ERROR,
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"Output channel layout %s does not match the number of channels mapped %d.\n",
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s->channel_layout_str, s->nch);
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return AVERROR(EINVAL);
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}
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s->output_layout = fmt;
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}
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if (!s->output_layout) {
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av_log(ctx, AV_LOG_ERROR, "Output channel layout is not set and "
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"cannot be guessed from the maps.\n");
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return AVERROR(EINVAL);
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}
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if (mode == MAP_PAIR_INT_STR || mode == MAP_PAIR_STR_STR) {
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for (i = 0; i < s->nch; i++) {
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s->map[i].out_channel_idx = av_get_channel_layout_channel_index(
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s->output_layout, s->map[i].out_channel);
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}
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}
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return 0;
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}
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static int channelmap_query_formats(AVFilterContext *ctx)
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{
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ChannelMapContext *s = ctx->priv;
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AVFilterChannelLayouts *channel_layouts = NULL;
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int ret;
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if ((ret = ff_set_common_formats (ctx, ff_planar_sample_fmts())) < 0 ||
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(ret = ff_set_common_samplerates (ctx , ff_all_samplerates() )) < 0 ||
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(ret = ff_add_channel_layout(&channel_layouts, s->output_layout)) < 0 ||
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(ret = ff_channel_layouts_ref(channel_layouts,
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&ctx->outputs[0]->in_channel_layouts)) < 0)
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return ret;
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return ff_channel_layouts_ref(ff_all_channel_counts(),
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&ctx->inputs[0]->out_channel_layouts);
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}
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static int channelmap_filter_frame(AVFilterLink *inlink, AVFrame *buf)
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{
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AVFilterContext *ctx = inlink->dst;
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AVFilterLink *outlink = ctx->outputs[0];
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const ChannelMapContext *s = ctx->priv;
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const int nch_in = inlink->channels;
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const int nch_out = s->nch;
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int ch;
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uint8_t *source_planes[MAX_CH];
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memcpy(source_planes, buf->extended_data,
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nch_in * sizeof(source_planes[0]));
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if (nch_out > nch_in) {
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if (nch_out > FF_ARRAY_ELEMS(buf->data)) {
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uint8_t **new_extended_data =
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av_mallocz_array(nch_out, sizeof(*buf->extended_data));
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if (!new_extended_data) {
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av_frame_free(&buf);
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return AVERROR(ENOMEM);
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}
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if (buf->extended_data == buf->data) {
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buf->extended_data = new_extended_data;
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} else {
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av_free(buf->extended_data);
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buf->extended_data = new_extended_data;
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}
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} else if (buf->extended_data != buf->data) {
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av_free(buf->extended_data);
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buf->extended_data = buf->data;
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}
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}
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for (ch = 0; ch < nch_out; ch++) {
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buf->extended_data[s->map[ch].out_channel_idx] =
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source_planes[s->map[ch].in_channel_idx];
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}
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if (buf->data != buf->extended_data)
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memcpy(buf->data, buf->extended_data,
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FFMIN(FF_ARRAY_ELEMS(buf->data), nch_out) * sizeof(buf->data[0]));
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buf->channel_layout = outlink->channel_layout;
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buf->channels = outlink->channels;
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return ff_filter_frame(outlink, buf);
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}
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static int channelmap_config_input(AVFilterLink *inlink)
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{
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AVFilterContext *ctx = inlink->dst;
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ChannelMapContext *s = ctx->priv;
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int nb_channels = inlink->channels;
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int i, err = 0;
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const char *channel_name;
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char layout_name[256];
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for (i = 0; i < s->nch; i++) {
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struct ChannelMap *m = &s->map[i];
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if (s->mode == MAP_PAIR_STR_INT || s->mode == MAP_PAIR_STR_STR) {
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m->in_channel_idx = av_get_channel_layout_channel_index(
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inlink->channel_layout, m->in_channel);
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}
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if (m->in_channel_idx < 0 || m->in_channel_idx >= nb_channels) {
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av_get_channel_layout_string(layout_name, sizeof(layout_name),
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nb_channels, inlink->channel_layout);
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if (m->in_channel) {
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channel_name = av_get_channel_name(m->in_channel);
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av_log(ctx, AV_LOG_ERROR,
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"input channel '%s' not available from input layout '%s'\n",
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channel_name, layout_name);
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} else {
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av_log(ctx, AV_LOG_ERROR,
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"input channel #%d not available from input layout '%s'\n",
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m->in_channel_idx, layout_name);
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}
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err = AVERROR(EINVAL);
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}
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}
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return err;
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}
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static const AVFilterPad avfilter_af_channelmap_inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_AUDIO,
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.filter_frame = channelmap_filter_frame,
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.config_props = channelmap_config_input,
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.needs_writable = 1,
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},
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{ NULL }
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};
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static const AVFilterPad avfilter_af_channelmap_outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_AUDIO
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},
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{ NULL }
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};
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AVFilter ff_af_channelmap = {
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.name = "channelmap",
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.description = NULL_IF_CONFIG_SMALL("Remap audio channels."),
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.init = channelmap_init,
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.query_formats = channelmap_query_formats,
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.priv_size = sizeof(ChannelMapContext),
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.priv_class = &channelmap_class,
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.inputs = avfilter_af_channelmap_inputs,
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.outputs = avfilter_af_channelmap_outputs,
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};
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