123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287 |
- /*
- * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
- *
- * This file is part of FFmpeg.
- *
- * FFmpeg is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * FFmpeg is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
- /**
- * @file
- * audio channel layout utility functions
- */
- #include <stdint.h>
- #include "avstring.h"
- #include "avutil.h"
- #include "channel_layout.h"
- #include "bprint.h"
- #include "common.h"
- struct channel_name {
- const char *name;
- const char *description;
- };
- static const struct channel_name channel_names[] = {
- [0] = { "FL", "front left" },
- [1] = { "FR", "front right" },
- [2] = { "FC", "front center" },
- [3] = { "LFE", "low frequency" },
- [4] = { "BL", "back left" },
- [5] = { "BR", "back right" },
- [6] = { "FLC", "front left-of-center" },
- [7] = { "FRC", "front right-of-center" },
- [8] = { "BC", "back center" },
- [9] = { "SL", "side left" },
- [10] = { "SR", "side right" },
- [11] = { "TC", "top center" },
- [12] = { "TFL", "top front left" },
- [13] = { "TFC", "top front center" },
- [14] = { "TFR", "top front right" },
- [15] = { "TBL", "top back left" },
- [16] = { "TBC", "top back center" },
- [17] = { "TBR", "top back right" },
- [29] = { "DL", "downmix left" },
- [30] = { "DR", "downmix right" },
- [31] = { "WL", "wide left" },
- [32] = { "WR", "wide right" },
- [33] = { "SDL", "surround direct left" },
- [34] = { "SDR", "surround direct right" },
- [35] = { "LFE2", "low frequency 2" },
- };
- static const char *get_channel_name(int channel_id)
- {
- if (channel_id < 0 || channel_id >= FF_ARRAY_ELEMS(channel_names))
- return NULL;
- return channel_names[channel_id].name;
- }
- static const struct {
- const char *name;
- int nb_channels;
- uint64_t layout;
- } channel_layout_map[] = {
- { "mono", 1, AV_CH_LAYOUT_MONO },
- { "stereo", 2, AV_CH_LAYOUT_STEREO },
- { "2.1", 3, AV_CH_LAYOUT_2POINT1 },
- { "3.0", 3, AV_CH_LAYOUT_SURROUND },
- { "3.0(back)", 3, AV_CH_LAYOUT_2_1 },
- { "4.0", 4, AV_CH_LAYOUT_4POINT0 },
- { "quad", 4, AV_CH_LAYOUT_QUAD },
- { "quad(side)", 4, AV_CH_LAYOUT_2_2 },
- { "3.1", 4, AV_CH_LAYOUT_3POINT1 },
- { "5.0", 5, AV_CH_LAYOUT_5POINT0_BACK },
- { "5.0(side)", 5, AV_CH_LAYOUT_5POINT0 },
- { "4.1", 5, AV_CH_LAYOUT_4POINT1 },
- { "5.1", 6, AV_CH_LAYOUT_5POINT1_BACK },
- { "5.1(side)", 6, AV_CH_LAYOUT_5POINT1 },
- { "6.0", 6, AV_CH_LAYOUT_6POINT0 },
- { "6.0(front)", 6, AV_CH_LAYOUT_6POINT0_FRONT },
- { "hexagonal", 6, AV_CH_LAYOUT_HEXAGONAL },
- { "6.1", 7, AV_CH_LAYOUT_6POINT1 },
- { "6.1(back)", 7, AV_CH_LAYOUT_6POINT1_BACK },
- { "6.1(front)", 7, AV_CH_LAYOUT_6POINT1_FRONT },
- { "7.0", 7, AV_CH_LAYOUT_7POINT0 },
- { "7.0(front)", 7, AV_CH_LAYOUT_7POINT0_FRONT },
- { "7.1", 8, AV_CH_LAYOUT_7POINT1 },
- { "7.1(wide)", 8, AV_CH_LAYOUT_7POINT1_WIDE_BACK },
- { "7.1(wide-side)", 8, AV_CH_LAYOUT_7POINT1_WIDE },
- { "octagonal", 8, AV_CH_LAYOUT_OCTAGONAL },
- { "hexadecagonal", 16, AV_CH_LAYOUT_HEXADECAGONAL },
- { "downmix", 2, AV_CH_LAYOUT_STEREO_DOWNMIX, },
- };
- static uint64_t get_channel_layout_single(const char *name, int name_len)
- {
- int i;
- char *end;
- int64_t layout;
- for (i = 0; i < FF_ARRAY_ELEMS(channel_layout_map); i++) {
- if (strlen(channel_layout_map[i].name) == name_len &&
- !memcmp(channel_layout_map[i].name, name, name_len))
- return channel_layout_map[i].layout;
- }
- for (i = 0; i < FF_ARRAY_ELEMS(channel_names); i++)
- if (channel_names[i].name &&
- strlen(channel_names[i].name) == name_len &&
- !memcmp(channel_names[i].name, name, name_len))
- return (int64_t)1 << i;
- errno = 0;
- i = strtol(name, &end, 10);
- if (!errno && (end + 1 - name == name_len && *end == 'c'))
- return av_get_default_channel_layout(i);
- errno = 0;
- layout = strtoll(name, &end, 0);
- if (!errno && end - name == name_len)
- return FFMAX(layout, 0);
- return 0;
- }
- uint64_t av_get_channel_layout(const char *name)
- {
- const char *n, *e;
- const char *name_end = name + strlen(name);
- int64_t layout = 0, layout_single;
- for (n = name; n < name_end; n = e + 1) {
- for (e = n; e < name_end && *e != '+' && *e != '|'; e++);
- layout_single = get_channel_layout_single(n, e - n);
- if (!layout_single)
- return 0;
- layout |= layout_single;
- }
- return layout;
- }
- int av_get_extended_channel_layout(const char *name, uint64_t* channel_layout, int* nb_channels)
- {
- int nb = 0;
- char *end;
- uint64_t layout = av_get_channel_layout(name);
- if (layout) {
- *channel_layout = layout;
- *nb_channels = av_get_channel_layout_nb_channels(layout);
- return 0;
- }
- nb = strtol(name, &end, 10);
- if (!errno && *end == 'C' && *(end + 1) == '\0' && nb > 0 && nb < 64) {
- *channel_layout = 0;
- *nb_channels = nb;
- return 0;
- }
- return AVERROR(EINVAL);
- }
- void av_bprint_channel_layout(struct AVBPrint *bp,
- int nb_channels, uint64_t channel_layout)
- {
- int i;
- if (nb_channels <= 0)
- nb_channels = av_get_channel_layout_nb_channels(channel_layout);
- for (i = 0; i < FF_ARRAY_ELEMS(channel_layout_map); i++)
- if (nb_channels == channel_layout_map[i].nb_channels &&
- channel_layout == channel_layout_map[i].layout) {
- av_bprintf(bp, "%s", channel_layout_map[i].name);
- return;
- }
- av_bprintf(bp, "%d channels", nb_channels);
- if (channel_layout) {
- int i, ch;
- av_bprintf(bp, " (");
- for (i = 0, ch = 0; i < 64; i++) {
- if ((channel_layout & (UINT64_C(1) << i))) {
- const char *name = get_channel_name(i);
- if (name) {
- if (ch > 0)
- av_bprintf(bp, "+");
- av_bprintf(bp, "%s", name);
- }
- ch++;
- }
- }
- av_bprintf(bp, ")");
- }
- }
- void av_get_channel_layout_string(char *buf, int buf_size,
- int nb_channels, uint64_t channel_layout)
- {
- AVBPrint bp;
- av_bprint_init_for_buffer(&bp, buf, buf_size);
- av_bprint_channel_layout(&bp, nb_channels, channel_layout);
- }
- int av_get_channel_layout_nb_channels(uint64_t channel_layout)
- {
- return av_popcount64(channel_layout);
- }
- int64_t av_get_default_channel_layout(int nb_channels) {
- int i;
- for (i = 0; i < FF_ARRAY_ELEMS(channel_layout_map); i++)
- if (nb_channels == channel_layout_map[i].nb_channels)
- return channel_layout_map[i].layout;
- return 0;
- }
- int av_get_channel_layout_channel_index(uint64_t channel_layout,
- uint64_t channel)
- {
- if (!(channel_layout & channel) ||
- av_get_channel_layout_nb_channels(channel) != 1)
- return AVERROR(EINVAL);
- channel_layout &= channel - 1;
- return av_get_channel_layout_nb_channels(channel_layout);
- }
- const char *av_get_channel_name(uint64_t channel)
- {
- int i;
- if (av_get_channel_layout_nb_channels(channel) != 1)
- return NULL;
- for (i = 0; i < 64; i++)
- if ((1ULL<<i) & channel)
- return get_channel_name(i);
- return NULL;
- }
- const char *av_get_channel_description(uint64_t channel)
- {
- int i;
- if (av_get_channel_layout_nb_channels(channel) != 1)
- return NULL;
- for (i = 0; i < FF_ARRAY_ELEMS(channel_names); i++)
- if ((1ULL<<i) & channel)
- return channel_names[i].description;
- return NULL;
- }
- uint64_t av_channel_layout_extract_channel(uint64_t channel_layout, int index)
- {
- int i;
- if (av_get_channel_layout_nb_channels(channel_layout) <= index)
- return 0;
- for (i = 0; i < 64; i++) {
- if ((1ULL << i) & channel_layout && !index--)
- return 1ULL << i;
- }
- return 0;
- }
- int av_get_standard_channel_layout(unsigned index, uint64_t *layout,
- const char **name)
- {
- if (index >= FF_ARRAY_ELEMS(channel_layout_map))
- return AVERROR_EOF;
- if (layout) *layout = channel_layout_map[index].layout;
- if (name) *name = channel_layout_map[index].name;
- return 0;
- }
|