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233 lines
7.6 KiB
233 lines
7.6 KiB
/* |
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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 Libav. |
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* |
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* Libav 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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* Libav 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 Libav; 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 "avstring.h" |
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#include "avutil.h" |
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#include "channel_layout.h" |
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#include "common.h" |
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static const char * const 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]; |
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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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{ "stereo", 2, AV_CH_LAYOUT_STEREO_DOWNMIX }, |
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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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{ "3.1", 4, AV_CH_LAYOUT_3POINT1 }, |
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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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{ "4.1", 5, AV_CH_LAYOUT_4POINT1 }, |
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{ "5.0", 5, AV_CH_LAYOUT_5POINT0 }, |
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{ "5.0", 5, AV_CH_LAYOUT_5POINT0_BACK }, |
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{ "5.1", 6, AV_CH_LAYOUT_5POINT1 }, |
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{ "5.1", 6, AV_CH_LAYOUT_5POINT1_BACK }, |
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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 }, |
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{ "7.1(wide)", 8, AV_CH_LAYOUT_7POINT1_WIDE_BACK }, |
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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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{ 0 } |
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}; |
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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) - 1; 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] && |
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strlen(channel_names[i]) == name_len && |
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!memcmp(channel_names[i], 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 (end - name == name_len || |
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(end + 1 - name == name_len && *end == 'c')) |
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return av_get_default_channel_layout(i); |
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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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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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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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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; channel_layout_map[i].name; 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_strlcpy(buf, channel_layout_map[i].name, buf_size); |
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return; |
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} |
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snprintf(buf, buf_size, "%d channels", nb_channels); |
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if (channel_layout) { |
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int i, ch; |
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av_strlcat(buf, " (", buf_size); |
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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_strlcat(buf, "|", buf_size); |
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av_strlcat(buf, name, buf_size); |
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} |
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ch++; |
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} |
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} |
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av_strlcat(buf, ")", buf_size); |
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} |
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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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uint64_t av_get_default_channel_layout(int nb_channels) |
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{ |
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switch(nb_channels) { |
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case 1: return AV_CH_LAYOUT_MONO; |
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case 2: return AV_CH_LAYOUT_STEREO; |
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case 3: return AV_CH_LAYOUT_SURROUND; |
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case 4: return AV_CH_LAYOUT_QUAD; |
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case 5: return AV_CH_LAYOUT_5POINT0; |
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case 6: return AV_CH_LAYOUT_5POINT1; |
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case 7: return AV_CH_LAYOUT_6POINT1; |
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case 8: return AV_CH_LAYOUT_7POINT1; |
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default: return 0; |
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} |
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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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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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