From 5980f5dd18822f29cfd583c9c085c3e77d81aa72 Mon Sep 17 00:00:00 2001 From: Justin Ruggles Date: Sat, 10 Nov 2012 09:03:17 -0500 Subject: lavu: rename audioconvert.* to channel_layout.* and deprecate audioconvert.h --- libavutil/channel_layout.c | 231 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 231 insertions(+) create mode 100644 libavutil/channel_layout.c (limited to 'libavutil/channel_layout.c') diff --git a/libavutil/channel_layout.c b/libavutil/channel_layout.c new file mode 100644 index 0000000000..79e398e41a --- /dev/null +++ b/libavutil/channel_layout.c @@ -0,0 +1,231 @@ +/* + * Copyright (c) 2006 Michael Niedermayer + * + * This file is part of Libav. + * + * Libav 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. + * + * Libav 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 Libav; 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 "avstring.h" +#include "avutil.h" +#include "channel_layout.h" +#include "common.h" + +static const char * const 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]; +} + +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 }, + { "stereo", 2, AV_CH_LAYOUT_STEREO_DOWNMIX }, + { "2.1", 3, AV_CH_LAYOUT_2POINT1 }, + { "3.0", 3, AV_CH_LAYOUT_SURROUND }, + { "3.0(back)", 3, AV_CH_LAYOUT_2_1 }, + { "3.1", 4, AV_CH_LAYOUT_3POINT1 }, + { "4.0", 4, AV_CH_LAYOUT_4POINT0 }, + { "quad", 4, AV_CH_LAYOUT_QUAD }, + { "quad(side)", 4, AV_CH_LAYOUT_2_2 }, + { "4.1", 5, AV_CH_LAYOUT_4POINT1 }, + { "5.0", 5, AV_CH_LAYOUT_5POINT0 }, + { "5.0", 5, AV_CH_LAYOUT_5POINT0_BACK }, + { "5.1", 6, AV_CH_LAYOUT_5POINT1 }, + { "5.1", 6, AV_CH_LAYOUT_5POINT1_BACK }, + { "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", 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 }, + { "7.1(wide)", 8, AV_CH_LAYOUT_7POINT1_WIDE_BACK }, + { "octagonal", 8, AV_CH_LAYOUT_OCTAGONAL }, + { "downmix", 2, AV_CH_LAYOUT_STEREO_DOWNMIX, }, + { 0 } +}; + +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) - 1; 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] && + strlen(channel_names[i]) == name_len && + !memcmp(channel_names[i], name, name_len)) + return (int64_t)1 << i; + i = strtol(name, &end, 10); + if (end - name == name_len || + (end + 1 - name == name_len && *end == 'c')) + return av_get_default_channel_layout(i); + layout = strtoll(name, &end, 0); + if (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_get_channel_layout_string(char *buf, int buf_size, + 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; channel_layout_map[i].name; i++) + if (nb_channels == channel_layout_map[i].nb_channels && + channel_layout == channel_layout_map[i].layout) { + av_strlcpy(buf, channel_layout_map[i].name, buf_size); + return; + } + + snprintf(buf, buf_size, "%d channels", nb_channels); + if (channel_layout) { + int i, ch; + av_strlcat(buf, " (", buf_size); + 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_strlcat(buf, "|", buf_size); + av_strlcat(buf, name, buf_size); + } + ch++; + } + } + av_strlcat(buf, ")", buf_size); + } +} + +int av_get_channel_layout_nb_channels(uint64_t channel_layout) +{ + return av_popcount64(channel_layout); +} + +uint64_t av_get_default_channel_layout(int nb_channels) +{ + switch(nb_channels) { + case 1: return AV_CH_LAYOUT_MONO; + case 2: return AV_CH_LAYOUT_STEREO; + case 3: return AV_CH_LAYOUT_SURROUND; + case 4: return AV_CH_LAYOUT_QUAD; + case 5: return AV_CH_LAYOUT_5POINT0; + case 6: return AV_CH_LAYOUT_5POINT1; + case 7: return AV_CH_LAYOUT_6POINT1; + case 8: return AV_CH_LAYOUT_7POINT1; + default: 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<