diff options
Diffstat (limited to 'media/ffvpx/libavutil/channel_layout.c')
| -rw-r--r-- | media/ffvpx/libavutil/channel_layout.c | 265 |
1 files changed, 265 insertions, 0 deletions
diff --git a/media/ffvpx/libavutil/channel_layout.c b/media/ffvpx/libavutil/channel_layout.c new file mode 100644 index 000000000..26c87c96a --- /dev/null +++ b/media/ffvpx/libavutil/channel_layout.c @@ -0,0 +1,265 @@ +/* + * 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; +} + +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; +} |