1017 lines
34 KiB
C
1017 lines
34 KiB
C
/*
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* Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
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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 layout utility functions
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*/
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include "avassert.h"
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#include "channel_layout.h"
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#include "bprint.h"
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#include "common.h"
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#include "error.h"
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#include "macros.h"
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#include "opt.h"
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#define CHAN_IS_AMBI(x) ((x) >= AV_CHAN_AMBISONIC_BASE &&\
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(x) <= AV_CHAN_AMBISONIC_END)
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struct channel_name {
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const char *name;
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const char *description;
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};
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static const struct channel_name channel_names[] = {
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[AV_CHAN_FRONT_LEFT ] = { "FL", "front left" },
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[AV_CHAN_FRONT_RIGHT ] = { "FR", "front right" },
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[AV_CHAN_FRONT_CENTER ] = { "FC", "front center" },
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[AV_CHAN_LOW_FREQUENCY ] = { "LFE", "low frequency" },
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[AV_CHAN_BACK_LEFT ] = { "BL", "back left" },
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[AV_CHAN_BACK_RIGHT ] = { "BR", "back right" },
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[AV_CHAN_FRONT_LEFT_OF_CENTER ] = { "FLC", "front left-of-center" },
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[AV_CHAN_FRONT_RIGHT_OF_CENTER] = { "FRC", "front right-of-center" },
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[AV_CHAN_BACK_CENTER ] = { "BC", "back center" },
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[AV_CHAN_SIDE_LEFT ] = { "SL", "side left" },
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[AV_CHAN_SIDE_RIGHT ] = { "SR", "side right" },
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[AV_CHAN_TOP_CENTER ] = { "TC", "top center" },
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[AV_CHAN_TOP_FRONT_LEFT ] = { "TFL", "top front left" },
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[AV_CHAN_TOP_FRONT_CENTER ] = { "TFC", "top front center" },
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[AV_CHAN_TOP_FRONT_RIGHT ] = { "TFR", "top front right" },
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[AV_CHAN_TOP_BACK_LEFT ] = { "TBL", "top back left" },
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[AV_CHAN_TOP_BACK_CENTER ] = { "TBC", "top back center" },
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[AV_CHAN_TOP_BACK_RIGHT ] = { "TBR", "top back right" },
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[AV_CHAN_STEREO_LEFT ] = { "DL", "downmix left" },
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[AV_CHAN_STEREO_RIGHT ] = { "DR", "downmix right" },
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[AV_CHAN_WIDE_LEFT ] = { "WL", "wide left" },
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[AV_CHAN_WIDE_RIGHT ] = { "WR", "wide right" },
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[AV_CHAN_SURROUND_DIRECT_LEFT ] = { "SDL", "surround direct left" },
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[AV_CHAN_SURROUND_DIRECT_RIGHT] = { "SDR", "surround direct right" },
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[AV_CHAN_LOW_FREQUENCY_2 ] = { "LFE2", "low frequency 2" },
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[AV_CHAN_TOP_SIDE_LEFT ] = { "TSL", "top side left" },
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[AV_CHAN_TOP_SIDE_RIGHT ] = { "TSR", "top side right" },
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[AV_CHAN_BOTTOM_FRONT_CENTER ] = { "BFC", "bottom front center" },
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[AV_CHAN_BOTTOM_FRONT_LEFT ] = { "BFL", "bottom front left" },
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[AV_CHAN_BOTTOM_FRONT_RIGHT ] = { "BFR", "bottom front right" },
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};
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static const char *get_channel_name(enum AVChannel channel_id)
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{
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if ((unsigned) channel_id >= FF_ARRAY_ELEMS(channel_names) ||
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!channel_names[channel_id].name)
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return NULL;
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return channel_names[channel_id].name;
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}
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void av_channel_name_bprint(AVBPrint *bp, enum AVChannel channel_id)
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{
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if (channel_id >= AV_CHAN_AMBISONIC_BASE &&
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channel_id <= AV_CHAN_AMBISONIC_END)
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av_bprintf(bp, "AMBI%d", channel_id - AV_CHAN_AMBISONIC_BASE);
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else if ((unsigned)channel_id < FF_ARRAY_ELEMS(channel_names) &&
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channel_names[channel_id].name)
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av_bprintf(bp, "%s", channel_names[channel_id].name);
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else if (channel_id == AV_CHAN_NONE)
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av_bprintf(bp, "NONE");
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else
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av_bprintf(bp, "USR%d", channel_id);
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}
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int av_channel_name(char *buf, size_t buf_size, enum AVChannel channel_id)
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{
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AVBPrint bp;
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if (!buf && buf_size)
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return AVERROR(EINVAL);
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av_bprint_init_for_buffer(&bp, buf, buf_size);
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av_channel_name_bprint(&bp, channel_id);
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if (bp.len >= INT_MAX)
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return AVERROR(ERANGE);
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return bp.len + 1;
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}
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void av_channel_description_bprint(AVBPrint *bp, enum AVChannel channel_id)
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{
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if (channel_id >= AV_CHAN_AMBISONIC_BASE &&
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channel_id <= AV_CHAN_AMBISONIC_END)
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av_bprintf(bp, "ambisonic ACN %d", channel_id - AV_CHAN_AMBISONIC_BASE);
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else if ((unsigned)channel_id < FF_ARRAY_ELEMS(channel_names) &&
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channel_names[channel_id].description)
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av_bprintf(bp, "%s", channel_names[channel_id].description);
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else if (channel_id == AV_CHAN_NONE)
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av_bprintf(bp, "none");
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else
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av_bprintf(bp, "user %d", channel_id);
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}
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int av_channel_description(char *buf, size_t buf_size, enum AVChannel channel_id)
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{
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AVBPrint bp;
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if (!buf && buf_size)
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return AVERROR(EINVAL);
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av_bprint_init_for_buffer(&bp, buf, buf_size);
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av_channel_description_bprint(&bp, channel_id);
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if (bp.len >= INT_MAX)
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return AVERROR(ERANGE);
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return bp.len + 1;
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}
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enum AVChannel av_channel_from_string(const char *str)
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{
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int i;
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char *endptr = (char *)str;
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enum AVChannel id = AV_CHAN_NONE;
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if (!strncmp(str, "AMBI", 4)) {
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i = strtol(str + 4, NULL, 0);
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if (i < 0 || i > AV_CHAN_AMBISONIC_END - AV_CHAN_AMBISONIC_BASE)
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return AV_CHAN_NONE;
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return AV_CHAN_AMBISONIC_BASE + i;
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}
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for (i = 0; i < FF_ARRAY_ELEMS(channel_names); i++) {
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if (channel_names[i].name && !strcmp(str, channel_names[i].name))
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return i;
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}
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if (!strncmp(str, "USR", 3)) {
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const char *p = str + 3;
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id = strtol(p, &endptr, 0);
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}
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if (id >= 0 && !*endptr)
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return id;
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return AV_CHAN_NONE;
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}
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struct channel_layout_name {
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const char *name;
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AVChannelLayout layout;
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};
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static const struct channel_layout_name channel_layout_map[] = {
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{ "mono", AV_CHANNEL_LAYOUT_MONO },
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{ "stereo", AV_CHANNEL_LAYOUT_STEREO },
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{ "2.1", AV_CHANNEL_LAYOUT_2POINT1 },
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{ "3.0", AV_CHANNEL_LAYOUT_SURROUND },
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{ "3.0(back)", AV_CHANNEL_LAYOUT_2_1 },
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{ "4.0", AV_CHANNEL_LAYOUT_4POINT0 },
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{ "quad", AV_CHANNEL_LAYOUT_QUAD },
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{ "quad(side)", AV_CHANNEL_LAYOUT_2_2 },
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{ "3.1", AV_CHANNEL_LAYOUT_3POINT1 },
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{ "5.0", AV_CHANNEL_LAYOUT_5POINT0_BACK },
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{ "5.0(side)", AV_CHANNEL_LAYOUT_5POINT0 },
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{ "4.1", AV_CHANNEL_LAYOUT_4POINT1 },
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{ "5.1", AV_CHANNEL_LAYOUT_5POINT1_BACK },
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{ "5.1(side)", AV_CHANNEL_LAYOUT_5POINT1 },
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{ "6.0", AV_CHANNEL_LAYOUT_6POINT0 },
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{ "6.0(front)", AV_CHANNEL_LAYOUT_6POINT0_FRONT },
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{ "3.1.2", AV_CHANNEL_LAYOUT_3POINT1POINT2 },
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{ "hexagonal", AV_CHANNEL_LAYOUT_HEXAGONAL },
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{ "6.1", AV_CHANNEL_LAYOUT_6POINT1 },
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{ "6.1(back)", AV_CHANNEL_LAYOUT_6POINT1_BACK },
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{ "6.1(front)", AV_CHANNEL_LAYOUT_6POINT1_FRONT },
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{ "7.0", AV_CHANNEL_LAYOUT_7POINT0 },
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{ "7.0(front)", AV_CHANNEL_LAYOUT_7POINT0_FRONT },
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{ "7.1", AV_CHANNEL_LAYOUT_7POINT1 },
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{ "7.1(wide)", AV_CHANNEL_LAYOUT_7POINT1_WIDE_BACK },
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{ "7.1(wide-side)", AV_CHANNEL_LAYOUT_7POINT1_WIDE },
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{ "5.1.2", AV_CHANNEL_LAYOUT_5POINT1POINT2_BACK },
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{ "octagonal", AV_CHANNEL_LAYOUT_OCTAGONAL },
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{ "cube", AV_CHANNEL_LAYOUT_CUBE },
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{ "5.1.4", AV_CHANNEL_LAYOUT_5POINT1POINT4_BACK },
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{ "7.1.2", AV_CHANNEL_LAYOUT_7POINT1POINT2 },
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{ "7.1.4", AV_CHANNEL_LAYOUT_7POINT1POINT4_BACK },
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{ "hexadecagonal", AV_CHANNEL_LAYOUT_HEXADECAGONAL },
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{ "downmix", AV_CHANNEL_LAYOUT_STEREO_DOWNMIX, },
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{ "22.2", AV_CHANNEL_LAYOUT_22POINT2, },
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};
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#if FF_API_OLD_CHANNEL_LAYOUT
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FF_DISABLE_DEPRECATION_WARNINGS
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static uint64_t get_channel_layout_single(const char *name, int name_len)
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{
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int i;
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char *end;
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int64_t layout;
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for (i = 0; i < FF_ARRAY_ELEMS(channel_layout_map); i++) {
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if (strlen(channel_layout_map[i].name) == name_len &&
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!memcmp(channel_layout_map[i].name, name, name_len))
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return channel_layout_map[i].layout.u.mask;
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}
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for (i = 0; i < FF_ARRAY_ELEMS(channel_names); i++)
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if (channel_names[i].name &&
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strlen(channel_names[i].name) == name_len &&
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!memcmp(channel_names[i].name, name, name_len))
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return (int64_t)1 << i;
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errno = 0;
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i = strtol(name, &end, 10);
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if (!errno && (end + 1 - name == name_len && *end == 'c'))
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return av_get_default_channel_layout(i);
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errno = 0;
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layout = strtoll(name, &end, 0);
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if (!errno && end - name == name_len)
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return FFMAX(layout, 0);
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return 0;
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}
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uint64_t av_get_channel_layout(const char *name)
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{
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const char *n, *e;
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const char *name_end = name + strlen(name);
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int64_t layout = 0, layout_single;
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for (n = name; n < name_end; n = e + 1) {
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for (e = n; e < name_end && *e != '+' && *e != '|'; e++);
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layout_single = get_channel_layout_single(n, e - n);
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if (!layout_single)
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return 0;
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layout |= layout_single;
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}
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return layout;
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}
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int av_get_extended_channel_layout(const char *name, uint64_t* channel_layout, int* nb_channels)
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{
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int nb = 0;
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char *end;
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uint64_t layout = av_get_channel_layout(name);
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if (layout) {
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*channel_layout = layout;
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*nb_channels = av_get_channel_layout_nb_channels(layout);
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return 0;
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}
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nb = strtol(name, &end, 10);
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if (!errno && *end == 'C' && *(end + 1) == '\0' && nb > 0 && nb < 64) {
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*channel_layout = 0;
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*nb_channels = nb;
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return 0;
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}
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return AVERROR(EINVAL);
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}
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void av_bprint_channel_layout(struct AVBPrint *bp,
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int nb_channels, uint64_t channel_layout)
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{
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int i;
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if (nb_channels <= 0)
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nb_channels = av_get_channel_layout_nb_channels(channel_layout);
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for (i = 0; i < FF_ARRAY_ELEMS(channel_layout_map); i++)
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if (nb_channels == channel_layout_map[i].layout.nb_channels &&
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channel_layout == channel_layout_map[i].layout.u.mask) {
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av_bprintf(bp, "%s", channel_layout_map[i].name);
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return;
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}
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av_bprintf(bp, "%d channels", nb_channels);
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if (channel_layout) {
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int i, ch;
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av_bprintf(bp, " (");
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for (i = 0, ch = 0; i < 64; i++) {
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if ((channel_layout & (UINT64_C(1) << i))) {
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const char *name = get_channel_name(i);
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if (name) {
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if (ch > 0)
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av_bprintf(bp, "+");
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av_bprintf(bp, "%s", name);
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}
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ch++;
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}
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}
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av_bprintf(bp, ")");
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}
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}
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void av_get_channel_layout_string(char *buf, int buf_size,
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int nb_channels, uint64_t channel_layout)
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{
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AVBPrint bp;
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av_bprint_init_for_buffer(&bp, buf, buf_size);
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av_bprint_channel_layout(&bp, nb_channels, channel_layout);
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}
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int av_get_channel_layout_nb_channels(uint64_t channel_layout)
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{
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return av_popcount64(channel_layout);
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}
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int64_t av_get_default_channel_layout(int nb_channels) {
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int i;
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for (i = 0; i < FF_ARRAY_ELEMS(channel_layout_map); i++)
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if (nb_channels == channel_layout_map[i].layout.nb_channels)
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return channel_layout_map[i].layout.u.mask;
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return 0;
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}
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int av_get_channel_layout_channel_index(uint64_t channel_layout,
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uint64_t channel)
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{
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if (!(channel_layout & channel) ||
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av_get_channel_layout_nb_channels(channel) != 1)
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return AVERROR(EINVAL);
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channel_layout &= channel - 1;
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return av_get_channel_layout_nb_channels(channel_layout);
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}
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const char *av_get_channel_name(uint64_t channel)
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{
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int i;
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if (av_get_channel_layout_nb_channels(channel) != 1)
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return NULL;
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for (i = 0; i < 64; i++)
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if ((1ULL<<i) & channel)
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return get_channel_name(i);
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return NULL;
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}
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const char *av_get_channel_description(uint64_t channel)
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{
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int i;
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if (av_get_channel_layout_nb_channels(channel) != 1)
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return NULL;
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for (i = 0; i < FF_ARRAY_ELEMS(channel_names); i++)
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if ((1ULL<<i) & channel)
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return channel_names[i].description;
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return NULL;
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}
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uint64_t av_channel_layout_extract_channel(uint64_t channel_layout, int index)
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{
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int i;
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if (av_get_channel_layout_nb_channels(channel_layout) <= index)
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return 0;
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for (i = 0; i < 64; i++) {
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if ((1ULL << i) & channel_layout && !index--)
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return 1ULL << i;
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}
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return 0;
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}
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int av_get_standard_channel_layout(unsigned index, uint64_t *layout,
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const char **name)
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{
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if (index >= FF_ARRAY_ELEMS(channel_layout_map))
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return AVERROR_EOF;
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if (layout) *layout = channel_layout_map[index].layout.u.mask;
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if (name) *name = channel_layout_map[index].name;
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return 0;
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}
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FF_ENABLE_DEPRECATION_WARNINGS
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#endif
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int av_channel_layout_from_mask(AVChannelLayout *channel_layout,
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uint64_t mask)
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{
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if (!mask)
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return AVERROR(EINVAL);
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channel_layout->order = AV_CHANNEL_ORDER_NATIVE;
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channel_layout->nb_channels = av_popcount64(mask);
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channel_layout->u.mask = mask;
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return 0;
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}
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int av_channel_layout_from_string(AVChannelLayout *channel_layout,
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const char *str)
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{
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int i;
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int channels = 0, nb_channels = 0, native = 1;
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enum AVChannel highest_channel = AV_CHAN_NONE;
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const char *dup;
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char *chlist, *end;
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uint64_t mask = 0;
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/* channel layout names */
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for (i = 0; i < FF_ARRAY_ELEMS(channel_layout_map); i++) {
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if (channel_layout_map[i].name && !strcmp(str, channel_layout_map[i].name)) {
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*channel_layout = channel_layout_map[i].layout;
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return 0;
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}
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}
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/* ambisonic */
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if (!strncmp(str, "ambisonic ", 10)) {
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const char *p = str + 10;
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char *endptr;
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AVChannelLayout extra = {0};
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int order;
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order = strtol(p, &endptr, 0);
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if (order < 0 || order + 1 > INT_MAX / (order + 1) ||
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(*endptr && *endptr != '+'))
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return AVERROR(EINVAL);
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channel_layout->order = AV_CHANNEL_ORDER_AMBISONIC;
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channel_layout->nb_channels = (order + 1) * (order + 1);
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if (*endptr) {
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int ret = av_channel_layout_from_string(&extra, endptr + 1);
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if (ret < 0)
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return ret;
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if (extra.nb_channels >= INT_MAX - channel_layout->nb_channels) {
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av_channel_layout_uninit(&extra);
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return AVERROR(EINVAL);
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}
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if (extra.order == AV_CHANNEL_ORDER_NATIVE) {
|
|
channel_layout->u.mask = extra.u.mask;
|
|
} else {
|
|
channel_layout->order = AV_CHANNEL_ORDER_CUSTOM;
|
|
channel_layout->u.map =
|
|
av_calloc(channel_layout->nb_channels + extra.nb_channels,
|
|
sizeof(*channel_layout->u.map));
|
|
if (!channel_layout->u.map) {
|
|
av_channel_layout_uninit(&extra);
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
|
|
for (i = 0; i < channel_layout->nb_channels; i++)
|
|
channel_layout->u.map[i].id = AV_CHAN_AMBISONIC_BASE + i;
|
|
for (i = 0; i < extra.nb_channels; i++) {
|
|
enum AVChannel ch = av_channel_layout_channel_from_index(&extra, i);
|
|
if (CHAN_IS_AMBI(ch)) {
|
|
av_channel_layout_uninit(&extra);
|
|
return AVERROR(EINVAL);
|
|
}
|
|
channel_layout->u.map[channel_layout->nb_channels + i].id = ch;
|
|
if (extra.order == AV_CHANNEL_ORDER_CUSTOM &&
|
|
extra.u.map[i].name[0])
|
|
av_strlcpy(channel_layout->u.map[channel_layout->nb_channels + i].name,
|
|
extra.u.map[i].name,
|
|
sizeof(channel_layout->u.map[channel_layout->nb_channels + i].name));
|
|
}
|
|
}
|
|
channel_layout->nb_channels += extra.nb_channels;
|
|
av_channel_layout_uninit(&extra);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
chlist = av_strdup(str);
|
|
if (!chlist)
|
|
return AVERROR(ENOMEM);
|
|
|
|
/* channel names */
|
|
av_sscanf(str, "%d channels (%[^)]", &nb_channels, chlist);
|
|
end = strchr(str, ')');
|
|
|
|
dup = chlist;
|
|
while (*dup) {
|
|
char *channel, *chname;
|
|
int ret = av_opt_get_key_value(&dup, "@", "+", AV_OPT_FLAG_IMPLICIT_KEY, &channel, &chname);
|
|
if (ret < 0) {
|
|
av_free(chlist);
|
|
return ret;
|
|
}
|
|
if (*dup)
|
|
dup++; // skip separator
|
|
if (channel && !*channel)
|
|
av_freep(&channel);
|
|
for (i = 0; i < FF_ARRAY_ELEMS(channel_names); i++) {
|
|
if (channel_names[i].name && !strcmp(channel ? channel : chname, channel_names[i].name)) {
|
|
if (channel || i < highest_channel || mask & (1ULL << i))
|
|
native = 0; // Not a native layout, use a custom one
|
|
highest_channel = i;
|
|
mask |= 1ULL << i;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!channel && i >= FF_ARRAY_ELEMS(channel_names)) {
|
|
char *endptr = chname;
|
|
enum AVChannel id = AV_CHAN_NONE;
|
|
|
|
if (!strncmp(chname, "USR", 3)) {
|
|
const char *p = chname + 3;
|
|
id = strtol(p, &endptr, 0);
|
|
}
|
|
if (id < 0 || *endptr) {
|
|
native = 0; // Unknown channel name
|
|
channels = 0;
|
|
mask = 0;
|
|
av_free(chname);
|
|
break;
|
|
}
|
|
if (id > 63)
|
|
native = 0; // Not a native layout, use a custom one
|
|
else {
|
|
if (id < highest_channel || mask & (1ULL << id))
|
|
native = 0; // Not a native layout, use a custom one
|
|
highest_channel = id;
|
|
mask |= 1ULL << id;
|
|
}
|
|
}
|
|
channels++;
|
|
av_free(channel);
|
|
av_free(chname);
|
|
}
|
|
|
|
if (mask && native) {
|
|
av_free(chlist);
|
|
if (nb_channels && ((nb_channels != channels) || (!end || *++end)))
|
|
return AVERROR(EINVAL);
|
|
av_channel_layout_from_mask(channel_layout, mask);
|
|
return 0;
|
|
}
|
|
|
|
/* custom layout of channel names */
|
|
if (channels && !native) {
|
|
int idx = 0;
|
|
|
|
if (nb_channels && ((nb_channels != channels) || (!end || *++end))) {
|
|
av_free(chlist);
|
|
return AVERROR(EINVAL);
|
|
}
|
|
|
|
channel_layout->u.map = av_calloc(channels, sizeof(*channel_layout->u.map));
|
|
if (!channel_layout->u.map) {
|
|
av_free(chlist);
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
|
|
channel_layout->order = AV_CHANNEL_ORDER_CUSTOM;
|
|
channel_layout->nb_channels = channels;
|
|
|
|
dup = chlist;
|
|
while (*dup) {
|
|
char *channel, *chname;
|
|
int ret = av_opt_get_key_value(&dup, "@", "+", AV_OPT_FLAG_IMPLICIT_KEY, &channel, &chname);
|
|
if (ret < 0) {
|
|
av_freep(&channel_layout->u.map);
|
|
av_free(chlist);
|
|
return ret;
|
|
}
|
|
if (*dup)
|
|
dup++; // skip separator
|
|
for (i = 0; i < FF_ARRAY_ELEMS(channel_names); i++) {
|
|
if (channel_names[i].name && !strcmp(channel ? channel : chname, channel_names[i].name)) {
|
|
channel_layout->u.map[idx].id = i;
|
|
if (channel)
|
|
av_strlcpy(channel_layout->u.map[idx].name, chname, sizeof(channel_layout->u.map[idx].name));
|
|
idx++;
|
|
break;
|
|
}
|
|
}
|
|
if (i >= FF_ARRAY_ELEMS(channel_names)) {
|
|
const char *p = (channel ? channel : chname) + 3;
|
|
channel_layout->u.map[idx].id = strtol(p, NULL, 0);
|
|
if (channel)
|
|
av_strlcpy(channel_layout->u.map[idx].name, chname, sizeof(channel_layout->u.map[idx].name));
|
|
idx++;
|
|
}
|
|
av_free(channel);
|
|
av_free(chname);
|
|
}
|
|
av_free(chlist);
|
|
|
|
return 0;
|
|
}
|
|
av_freep(&chlist);
|
|
|
|
errno = 0;
|
|
mask = strtoull(str, &end, 0);
|
|
|
|
/* channel layout mask */
|
|
if (!errno && !*end && !strchr(str, '-') && mask) {
|
|
av_channel_layout_from_mask(channel_layout, mask);
|
|
return 0;
|
|
}
|
|
|
|
errno = 0;
|
|
channels = strtol(str, &end, 10);
|
|
|
|
/* number of channels */
|
|
if (!errno && !strcmp(end, "c") && channels > 0) {
|
|
av_channel_layout_default(channel_layout, channels);
|
|
if (channel_layout->order == AV_CHANNEL_ORDER_NATIVE)
|
|
return 0;
|
|
}
|
|
|
|
/* number of unordered channels */
|
|
if (!errno && (!strcmp(end, "C") || !strcmp(end, " channels"))
|
|
&& channels > 0) {
|
|
channel_layout->order = AV_CHANNEL_ORDER_UNSPEC;
|
|
channel_layout->nb_channels = channels;
|
|
return 0;
|
|
}
|
|
|
|
return AVERROR(EINVAL);
|
|
}
|
|
|
|
void av_channel_layout_uninit(AVChannelLayout *channel_layout)
|
|
{
|
|
if (channel_layout->order == AV_CHANNEL_ORDER_CUSTOM)
|
|
av_freep(&channel_layout->u.map);
|
|
memset(channel_layout, 0, sizeof(*channel_layout));
|
|
}
|
|
|
|
int av_channel_layout_copy(AVChannelLayout *dst, const AVChannelLayout *src)
|
|
{
|
|
av_channel_layout_uninit(dst);
|
|
*dst = *src;
|
|
if (src->order == AV_CHANNEL_ORDER_CUSTOM) {
|
|
dst->u.map = av_malloc_array(src->nb_channels, sizeof(*dst->u.map));
|
|
if (!dst->u.map)
|
|
return AVERROR(ENOMEM);
|
|
memcpy(dst->u.map, src->u.map, src->nb_channels * sizeof(*src->u.map));
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* If the layout is n-th order standard-order ambisonic, with optional
|
|
* extra non-diegetic channels at the end, return the order.
|
|
* Return a negative error code otherwise.
|
|
*/
|
|
static int ambisonic_order(const AVChannelLayout *channel_layout)
|
|
{
|
|
int i, highest_ambi, order;
|
|
|
|
highest_ambi = -1;
|
|
if (channel_layout->order == AV_CHANNEL_ORDER_AMBISONIC)
|
|
highest_ambi = channel_layout->nb_channels - av_popcount64(channel_layout->u.mask) - 1;
|
|
else {
|
|
const AVChannelCustom *map = channel_layout->u.map;
|
|
av_assert0(channel_layout->order == AV_CHANNEL_ORDER_CUSTOM);
|
|
|
|
for (i = 0; i < channel_layout->nb_channels; i++) {
|
|
int is_ambi = CHAN_IS_AMBI(map[i].id);
|
|
|
|
/* ambisonic following non-ambisonic */
|
|
if (i > 0 && is_ambi && !CHAN_IS_AMBI(map[i - 1].id))
|
|
return AVERROR(EINVAL);
|
|
|
|
/* non-default ordering */
|
|
if (is_ambi && map[i].id - AV_CHAN_AMBISONIC_BASE != i)
|
|
return AVERROR(EINVAL);
|
|
|
|
if (CHAN_IS_AMBI(map[i].id))
|
|
highest_ambi = i;
|
|
}
|
|
}
|
|
/* no ambisonic channels*/
|
|
if (highest_ambi < 0)
|
|
return AVERROR(EINVAL);
|
|
|
|
order = floor(sqrt(highest_ambi));
|
|
/* incomplete order - some harmonics are missing */
|
|
if ((order + 1) * (order + 1) != highest_ambi + 1)
|
|
return AVERROR(EINVAL);
|
|
|
|
return order;
|
|
}
|
|
|
|
/**
|
|
* If the custom layout is n-th order standard-order ambisonic, with optional
|
|
* extra non-diegetic channels at the end, write its string description in bp.
|
|
* Return a negative error code otherwise.
|
|
*/
|
|
static int try_describe_ambisonic(AVBPrint *bp, const AVChannelLayout *channel_layout)
|
|
{
|
|
int nb_ambi_channels;
|
|
int order = ambisonic_order(channel_layout);
|
|
if (order < 0)
|
|
return order;
|
|
|
|
av_bprintf(bp, "ambisonic %d", order);
|
|
|
|
/* extra channels present */
|
|
nb_ambi_channels = (order + 1) * (order + 1);
|
|
if (nb_ambi_channels < channel_layout->nb_channels) {
|
|
AVChannelLayout extra = { 0 };
|
|
|
|
if (channel_layout->order == AV_CHANNEL_ORDER_AMBISONIC) {
|
|
extra.order = AV_CHANNEL_ORDER_NATIVE;
|
|
extra.nb_channels = av_popcount64(channel_layout->u.mask);
|
|
extra.u.mask = channel_layout->u.mask;
|
|
} else {
|
|
extra.order = AV_CHANNEL_ORDER_CUSTOM;
|
|
extra.nb_channels = channel_layout->nb_channels - nb_ambi_channels;
|
|
extra.u.map = channel_layout->u.map + nb_ambi_channels;
|
|
}
|
|
|
|
av_bprint_chars(bp, '+', 1);
|
|
av_channel_layout_describe_bprint(&extra, bp);
|
|
/* Not calling uninit here on extra because we don't own the u.map pointer */
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int av_channel_layout_describe_bprint(const AVChannelLayout *channel_layout,
|
|
AVBPrint *bp)
|
|
{
|
|
int i;
|
|
|
|
switch (channel_layout->order) {
|
|
case AV_CHANNEL_ORDER_NATIVE:
|
|
for (i = 0; i < FF_ARRAY_ELEMS(channel_layout_map); i++)
|
|
if (channel_layout->u.mask == channel_layout_map[i].layout.u.mask) {
|
|
av_bprintf(bp, "%s", channel_layout_map[i].name);
|
|
return 0;
|
|
}
|
|
// fall-through
|
|
case AV_CHANNEL_ORDER_CUSTOM:
|
|
if (channel_layout->order == AV_CHANNEL_ORDER_CUSTOM) {
|
|
int res = try_describe_ambisonic(bp, channel_layout);
|
|
if (res >= 0)
|
|
return 0;
|
|
}
|
|
if (channel_layout->nb_channels)
|
|
av_bprintf(bp, "%d channels (", channel_layout->nb_channels);
|
|
for (i = 0; i < channel_layout->nb_channels; i++) {
|
|
enum AVChannel ch = av_channel_layout_channel_from_index(channel_layout, i);
|
|
|
|
if (i)
|
|
av_bprintf(bp, "+");
|
|
av_channel_name_bprint(bp, ch);
|
|
if (channel_layout->order == AV_CHANNEL_ORDER_CUSTOM &&
|
|
channel_layout->u.map[i].name[0])
|
|
av_bprintf(bp, "@%s", channel_layout->u.map[i].name);
|
|
}
|
|
if (channel_layout->nb_channels) {
|
|
av_bprintf(bp, ")");
|
|
return 0;
|
|
}
|
|
// fall-through
|
|
case AV_CHANNEL_ORDER_UNSPEC:
|
|
av_bprintf(bp, "%d channels", channel_layout->nb_channels);
|
|
return 0;
|
|
case AV_CHANNEL_ORDER_AMBISONIC:
|
|
return try_describe_ambisonic(bp, channel_layout);
|
|
default:
|
|
return AVERROR(EINVAL);
|
|
}
|
|
}
|
|
|
|
int av_channel_layout_describe(const AVChannelLayout *channel_layout,
|
|
char *buf, size_t buf_size)
|
|
{
|
|
AVBPrint bp;
|
|
int ret;
|
|
|
|
if (!buf && buf_size)
|
|
return AVERROR(EINVAL);
|
|
|
|
av_bprint_init_for_buffer(&bp, buf, buf_size);
|
|
ret = av_channel_layout_describe_bprint(channel_layout, &bp);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (bp.len >= INT_MAX)
|
|
return AVERROR(ERANGE);
|
|
return bp.len + 1;
|
|
}
|
|
|
|
enum AVChannel
|
|
av_channel_layout_channel_from_index(const AVChannelLayout *channel_layout,
|
|
unsigned int idx)
|
|
{
|
|
int i;
|
|
|
|
if (idx >= channel_layout->nb_channels)
|
|
return AV_CHAN_NONE;
|
|
|
|
switch (channel_layout->order) {
|
|
case AV_CHANNEL_ORDER_CUSTOM:
|
|
return channel_layout->u.map[idx].id;
|
|
case AV_CHANNEL_ORDER_AMBISONIC: {
|
|
int ambi_channels = channel_layout->nb_channels - av_popcount64(channel_layout->u.mask);
|
|
if (idx < ambi_channels)
|
|
return AV_CHAN_AMBISONIC_BASE + idx;
|
|
idx -= ambi_channels;
|
|
}
|
|
// fall-through
|
|
case AV_CHANNEL_ORDER_NATIVE:
|
|
for (i = 0; i < 64; i++) {
|
|
if ((1ULL << i) & channel_layout->u.mask && !idx--)
|
|
return i;
|
|
}
|
|
default:
|
|
return AV_CHAN_NONE;
|
|
}
|
|
}
|
|
|
|
enum AVChannel
|
|
av_channel_layout_channel_from_string(const AVChannelLayout *channel_layout,
|
|
const char *str)
|
|
{
|
|
int index = av_channel_layout_index_from_string(channel_layout, str);
|
|
|
|
if (index < 0)
|
|
return AV_CHAN_NONE;
|
|
|
|
return av_channel_layout_channel_from_index(channel_layout, index);
|
|
}
|
|
|
|
int av_channel_layout_index_from_channel(const AVChannelLayout *channel_layout,
|
|
enum AVChannel channel)
|
|
{
|
|
int i;
|
|
|
|
if (channel == AV_CHAN_NONE)
|
|
return AVERROR(EINVAL);
|
|
|
|
switch (channel_layout->order) {
|
|
case AV_CHANNEL_ORDER_CUSTOM:
|
|
for (i = 0; i < channel_layout->nb_channels; i++)
|
|
if (channel_layout->u.map[i].id == channel)
|
|
return i;
|
|
return AVERROR(EINVAL);
|
|
case AV_CHANNEL_ORDER_AMBISONIC:
|
|
case AV_CHANNEL_ORDER_NATIVE: {
|
|
uint64_t mask = channel_layout->u.mask;
|
|
int ambi_channels = channel_layout->nb_channels - av_popcount64(mask);
|
|
if (channel_layout->order == AV_CHANNEL_ORDER_AMBISONIC &&
|
|
channel >= AV_CHAN_AMBISONIC_BASE) {
|
|
if (channel - AV_CHAN_AMBISONIC_BASE >= ambi_channels)
|
|
return AVERROR(EINVAL);
|
|
return channel - AV_CHAN_AMBISONIC_BASE;
|
|
}
|
|
if ((unsigned)channel > 63 || !(mask & (1ULL << channel)))
|
|
return AVERROR(EINVAL);
|
|
mask &= (1ULL << channel) - 1;
|
|
return av_popcount64(mask) + ambi_channels;
|
|
}
|
|
default:
|
|
return AVERROR(EINVAL);
|
|
}
|
|
}
|
|
|
|
int av_channel_layout_index_from_string(const AVChannelLayout *channel_layout,
|
|
const char *str)
|
|
{
|
|
char *chname;
|
|
enum AVChannel ch = AV_CHAN_NONE;
|
|
|
|
switch (channel_layout->order) {
|
|
case AV_CHANNEL_ORDER_CUSTOM:
|
|
chname = strstr(str, "@");
|
|
if (chname) {
|
|
char buf[16];
|
|
chname++;
|
|
av_strlcpy(buf, str, FFMIN(sizeof(buf), chname - str));
|
|
if (!*chname)
|
|
chname = NULL;
|
|
ch = av_channel_from_string(buf);
|
|
if (ch == AV_CHAN_NONE && *buf)
|
|
return AVERROR(EINVAL);
|
|
}
|
|
for (int i = 0; chname && i < channel_layout->nb_channels; i++) {
|
|
if (!strcmp(chname, channel_layout->u.map[i].name) &&
|
|
(ch == AV_CHAN_NONE || ch == channel_layout->u.map[i].id))
|
|
return i;
|
|
}
|
|
// fall-through
|
|
case AV_CHANNEL_ORDER_AMBISONIC:
|
|
case AV_CHANNEL_ORDER_NATIVE:
|
|
ch = av_channel_from_string(str);
|
|
if (ch == AV_CHAN_NONE)
|
|
return AVERROR(EINVAL);
|
|
return av_channel_layout_index_from_channel(channel_layout, ch);
|
|
}
|
|
|
|
return AVERROR(EINVAL);
|
|
}
|
|
|
|
int av_channel_layout_check(const AVChannelLayout *channel_layout)
|
|
{
|
|
if (channel_layout->nb_channels <= 0)
|
|
return 0;
|
|
|
|
switch (channel_layout->order) {
|
|
case AV_CHANNEL_ORDER_NATIVE:
|
|
return av_popcount64(channel_layout->u.mask) == channel_layout->nb_channels;
|
|
case AV_CHANNEL_ORDER_CUSTOM:
|
|
if (!channel_layout->u.map)
|
|
return 0;
|
|
for (int i = 0; i < channel_layout->nb_channels; i++) {
|
|
if (channel_layout->u.map[i].id == AV_CHAN_NONE)
|
|
return 0;
|
|
}
|
|
return 1;
|
|
case AV_CHANNEL_ORDER_AMBISONIC:
|
|
/* If non-diegetic channels are present, ensure they are taken into account */
|
|
return av_popcount64(channel_layout->u.mask) < channel_layout->nb_channels;
|
|
case AV_CHANNEL_ORDER_UNSPEC:
|
|
return 1;
|
|
default:
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
int av_channel_layout_compare(const AVChannelLayout *chl, const AVChannelLayout *chl1)
|
|
{
|
|
int i;
|
|
|
|
/* different channel counts -> not equal */
|
|
if (chl->nb_channels != chl1->nb_channels)
|
|
return 1;
|
|
|
|
/* if only one is unspecified -> not equal */
|
|
if ((chl->order == AV_CHANNEL_ORDER_UNSPEC) !=
|
|
(chl1->order == AV_CHANNEL_ORDER_UNSPEC))
|
|
return 1;
|
|
/* both are unspecified -> equal */
|
|
else if (chl->order == AV_CHANNEL_ORDER_UNSPEC)
|
|
return 0;
|
|
|
|
/* can compare masks directly */
|
|
if ((chl->order == AV_CHANNEL_ORDER_NATIVE ||
|
|
chl->order == AV_CHANNEL_ORDER_AMBISONIC) &&
|
|
chl->order == chl1->order)
|
|
return chl->u.mask != chl1->u.mask;
|
|
|
|
/* compare channel by channel */
|
|
for (i = 0; i < chl->nb_channels; i++)
|
|
if (av_channel_layout_channel_from_index(chl, i) !=
|
|
av_channel_layout_channel_from_index(chl1, i))
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
void av_channel_layout_default(AVChannelLayout *ch_layout, int nb_channels)
|
|
{
|
|
int i;
|
|
for (i = 0; i < FF_ARRAY_ELEMS(channel_layout_map); i++)
|
|
if (nb_channels == channel_layout_map[i].layout.nb_channels) {
|
|
*ch_layout = channel_layout_map[i].layout;
|
|
return;
|
|
}
|
|
|
|
ch_layout->order = AV_CHANNEL_ORDER_UNSPEC;
|
|
ch_layout->nb_channels = nb_channels;
|
|
}
|
|
|
|
const AVChannelLayout *av_channel_layout_standard(void **opaque)
|
|
{
|
|
uintptr_t i = (uintptr_t)*opaque;
|
|
const AVChannelLayout *ch_layout = NULL;
|
|
|
|
if (i < FF_ARRAY_ELEMS(channel_layout_map)) {
|
|
ch_layout = &channel_layout_map[i].layout;
|
|
*opaque = (void*)(i + 1);
|
|
}
|
|
|
|
return ch_layout;
|
|
}
|
|
|
|
uint64_t av_channel_layout_subset(const AVChannelLayout *channel_layout,
|
|
uint64_t mask)
|
|
{
|
|
uint64_t ret = 0;
|
|
int i;
|
|
|
|
switch (channel_layout->order) {
|
|
case AV_CHANNEL_ORDER_NATIVE:
|
|
case AV_CHANNEL_ORDER_AMBISONIC:
|
|
return channel_layout->u.mask & mask;
|
|
case AV_CHANNEL_ORDER_CUSTOM:
|
|
for (i = 0; i < 64; i++)
|
|
if (mask & (1ULL << i) && av_channel_layout_index_from_channel(channel_layout, i) >= 0)
|
|
ret |= (1ULL << i);
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|