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https://github.com/FFmpeg/FFmpeg.git
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d96e377c39
The new syntax is preferred since it allows backward syntax compatibility with libswr when switching to the new option handling code with AV_OPT_TYPE_CHANNEL_LAYOUT. With the new parser the string: 1234 is interpreted as a channel layout mask, rather than as a number of channels, and thus it's compatible with the current way to set a channel layout as an integer (e.g. for the icl and ocl options) making use of integer option values. ff_get_channel_layout() with compat=0 will be used in the AV_OPT_TYPE_CHANNEL handler code. The user is encouraged to switch to the new forward compatible syntax, which requires to put a trailing "c" when specifying a layout as a number of channels.
298 lines
9.7 KiB
C
298 lines
9.7 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 "avstring.h"
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#include "avutil.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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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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[0] = { "FL", "front left" },
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[1] = { "FR", "front right" },
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[2] = { "FC", "front center" },
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[3] = { "LFE", "low frequency" },
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[4] = { "BL", "back left" },
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[5] = { "BR", "back right" },
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[6] = { "FLC", "front left-of-center" },
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[7] = { "FRC", "front right-of-center" },
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[8] = { "BC", "back center" },
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[9] = { "SL", "side left" },
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[10] = { "SR", "side right" },
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[11] = { "TC", "top center" },
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[12] = { "TFL", "top front left" },
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[13] = { "TFC", "top front center" },
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[14] = { "TFR", "top front right" },
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[15] = { "TBL", "top back left" },
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[16] = { "TBC", "top back center" },
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[17] = { "TBR", "top back right" },
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[29] = { "DL", "downmix left" },
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[30] = { "DR", "downmix right" },
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[31] = { "WL", "wide left" },
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[32] = { "WR", "wide right" },
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[33] = { "SDL", "surround direct left" },
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[34] = { "SDR", "surround direct right" },
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[35] = { "LFE2", "low frequency 2" },
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};
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static const char *get_channel_name(int channel_id)
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{
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if (channel_id < 0 || channel_id >= FF_ARRAY_ELEMS(channel_names))
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return NULL;
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return channel_names[channel_id].name;
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}
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static const struct {
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const char *name;
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int nb_channels;
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uint64_t layout;
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} channel_layout_map[] = {
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{ "mono", 1, AV_CH_LAYOUT_MONO },
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{ "stereo", 2, AV_CH_LAYOUT_STEREO },
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{ "2.1", 3, AV_CH_LAYOUT_2POINT1 },
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{ "3.0", 3, AV_CH_LAYOUT_SURROUND },
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{ "3.0(back)", 3, AV_CH_LAYOUT_2_1 },
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{ "4.0", 4, AV_CH_LAYOUT_4POINT0 },
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{ "quad", 4, AV_CH_LAYOUT_QUAD },
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{ "quad(side)", 4, AV_CH_LAYOUT_2_2 },
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{ "3.1", 4, AV_CH_LAYOUT_3POINT1 },
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{ "5.0", 5, AV_CH_LAYOUT_5POINT0_BACK },
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{ "5.0(side)", 5, AV_CH_LAYOUT_5POINT0 },
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{ "4.1", 5, AV_CH_LAYOUT_4POINT1 },
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{ "5.1", 6, AV_CH_LAYOUT_5POINT1_BACK },
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{ "5.1(side)", 6, AV_CH_LAYOUT_5POINT1 },
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{ "6.0", 6, AV_CH_LAYOUT_6POINT0 },
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{ "6.0(front)", 6, AV_CH_LAYOUT_6POINT0_FRONT },
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{ "hexagonal", 6, AV_CH_LAYOUT_HEXAGONAL },
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{ "6.1", 7, AV_CH_LAYOUT_6POINT1 },
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{ "6.1", 7, AV_CH_LAYOUT_6POINT1_BACK },
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{ "6.1(front)", 7, AV_CH_LAYOUT_6POINT1_FRONT },
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{ "7.0", 7, AV_CH_LAYOUT_7POINT0 },
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{ "7.0(front)", 7, AV_CH_LAYOUT_7POINT0_FRONT },
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{ "7.1", 8, AV_CH_LAYOUT_7POINT1 },
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{ "7.1(wide)", 8, AV_CH_LAYOUT_7POINT1_WIDE_BACK },
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{ "7.1(wide-side)", 8, AV_CH_LAYOUT_7POINT1_WIDE },
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{ "octagonal", 8, AV_CH_LAYOUT_OCTAGONAL },
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{ "downmix", 2, AV_CH_LAYOUT_STEREO_DOWNMIX, },
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};
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#if FF_API_GET_CHANNEL_LAYOUT_COMPAT
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static uint64_t get_channel_layout_single(const char *name, int name_len, int compat)
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#else
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static uint64_t get_channel_layout_single(const char *name, int name_len)
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#endif
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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;
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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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i = strtol(name, &end, 10);
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#if FF_API_GET_CHANNEL_LAYOUT_COMPAT
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if (compat) {
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if (end - name == name_len ||
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(end + 1 - name == name_len && *end == 'c')) {
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layout = av_get_default_channel_layout(i);
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if (end - name == name_len) {
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av_log(NULL, AV_LOG_WARNING,
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"Single channel layout '%.*s' is interpreted as a number of channels, "
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"switch to the syntax '%.*sc' otherwise it will be interpreted as a "
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"channel layout number in a later version\n",
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name_len, name, name_len, name);
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return layout;
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}
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}
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} else {
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#endif
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if ((end + 1 - name == name_len && *end == 'c'))
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return av_get_default_channel_layout(i);
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#if FF_API_GET_CHANNEL_LAYOUT_COMPAT
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}
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#endif
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layout = strtoll(name, &end, 0);
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if (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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#if FF_API_GET_CHANNEL_LAYOUT_COMPAT
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uint64_t ff_get_channel_layout(const char *name, int compat)
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#else
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uint64_t av_get_channel_layout(const char *name)
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#endif
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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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#if FF_API_GET_CHANNEL_LAYOUT_COMPAT
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layout_single = get_channel_layout_single(n, e - n, compat);
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#else
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layout_single = get_channel_layout_single(n, e - n);
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#endif
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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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#if FF_API_GET_CHANNEL_LAYOUT_COMPAT
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uint64_t av_get_channel_layout(const char *name)
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{
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return ff_get_channel_layout(name, 1);
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}
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#endif
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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].nb_channels &&
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channel_layout == channel_layout_map[i].layout) {
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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].nb_channels)
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return channel_layout_map[i].layout;
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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;
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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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