FFmpeg  4.0
channel_layout.c
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1 /*
2  * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 /**
22  * @file
23  * audio channel layout utility functions
24  */
25 
26 #include <stdint.h>
27 
28 #include "avstring.h"
29 #include "avutil.h"
30 #include "channel_layout.h"
31 #include "bprint.h"
32 #include "common.h"
33 
34 struct channel_name {
35  const char *name;
36  const char *description;
37 };
38 
39 static const struct channel_name channel_names[] = {
40  [0] = { "FL", "front left" },
41  [1] = { "FR", "front right" },
42  [2] = { "FC", "front center" },
43  [3] = { "LFE", "low frequency" },
44  [4] = { "BL", "back left" },
45  [5] = { "BR", "back right" },
46  [6] = { "FLC", "front left-of-center" },
47  [7] = { "FRC", "front right-of-center" },
48  [8] = { "BC", "back center" },
49  [9] = { "SL", "side left" },
50  [10] = { "SR", "side right" },
51  [11] = { "TC", "top center" },
52  [12] = { "TFL", "top front left" },
53  [13] = { "TFC", "top front center" },
54  [14] = { "TFR", "top front right" },
55  [15] = { "TBL", "top back left" },
56  [16] = { "TBC", "top back center" },
57  [17] = { "TBR", "top back right" },
58  [29] = { "DL", "downmix left" },
59  [30] = { "DR", "downmix right" },
60  [31] = { "WL", "wide left" },
61  [32] = { "WR", "wide right" },
62  [33] = { "SDL", "surround direct left" },
63  [34] = { "SDR", "surround direct right" },
64  [35] = { "LFE2", "low frequency 2" },
65 };
66 
67 static const char *get_channel_name(int channel_id)
68 {
69  if (channel_id < 0 || channel_id >= FF_ARRAY_ELEMS(channel_names))
70  return NULL;
71  return channel_names[channel_id].name;
72 }
73 
74 static const struct {
75  const char *name;
77  uint64_t layout;
78 } channel_layout_map[] = {
79  { "mono", 1, AV_CH_LAYOUT_MONO },
80  { "stereo", 2, AV_CH_LAYOUT_STEREO },
81  { "2.1", 3, AV_CH_LAYOUT_2POINT1 },
82  { "3.0", 3, AV_CH_LAYOUT_SURROUND },
83  { "3.0(back)", 3, AV_CH_LAYOUT_2_1 },
84  { "4.0", 4, AV_CH_LAYOUT_4POINT0 },
85  { "quad", 4, AV_CH_LAYOUT_QUAD },
86  { "quad(side)", 4, AV_CH_LAYOUT_2_2 },
87  { "3.1", 4, AV_CH_LAYOUT_3POINT1 },
88  { "5.0", 5, AV_CH_LAYOUT_5POINT0_BACK },
89  { "5.0(side)", 5, AV_CH_LAYOUT_5POINT0 },
90  { "4.1", 5, AV_CH_LAYOUT_4POINT1 },
91  { "5.1", 6, AV_CH_LAYOUT_5POINT1_BACK },
92  { "5.1(side)", 6, AV_CH_LAYOUT_5POINT1 },
93  { "6.0", 6, AV_CH_LAYOUT_6POINT0 },
94  { "6.0(front)", 6, AV_CH_LAYOUT_6POINT0_FRONT },
95  { "hexagonal", 6, AV_CH_LAYOUT_HEXAGONAL },
96  { "6.1", 7, AV_CH_LAYOUT_6POINT1 },
97  { "6.1(back)", 7, AV_CH_LAYOUT_6POINT1_BACK },
98  { "6.1(front)", 7, AV_CH_LAYOUT_6POINT1_FRONT },
99  { "7.0", 7, AV_CH_LAYOUT_7POINT0 },
100  { "7.0(front)", 7, AV_CH_LAYOUT_7POINT0_FRONT },
101  { "7.1", 8, AV_CH_LAYOUT_7POINT1 },
102  { "7.1(wide)", 8, AV_CH_LAYOUT_7POINT1_WIDE_BACK },
103  { "7.1(wide-side)", 8, AV_CH_LAYOUT_7POINT1_WIDE },
104  { "octagonal", 8, AV_CH_LAYOUT_OCTAGONAL },
105  { "hexadecagonal", 16, AV_CH_LAYOUT_HEXADECAGONAL },
106  { "downmix", 2, AV_CH_LAYOUT_STEREO_DOWNMIX, },
107 };
108 
109 static uint64_t get_channel_layout_single(const char *name, int name_len)
110 {
111  int i;
112  char *end;
113  int64_t layout;
114 
115  for (i = 0; i < FF_ARRAY_ELEMS(channel_layout_map); i++) {
116  if (strlen(channel_layout_map[i].name) == name_len &&
117  !memcmp(channel_layout_map[i].name, name, name_len))
118  return channel_layout_map[i].layout;
119  }
120  for (i = 0; i < FF_ARRAY_ELEMS(channel_names); i++)
121  if (channel_names[i].name &&
122  strlen(channel_names[i].name) == name_len &&
123  !memcmp(channel_names[i].name, name, name_len))
124  return (int64_t)1 << i;
125 
126  errno = 0;
127  i = strtol(name, &end, 10);
128 
129  if (!errno && (end + 1 - name == name_len && *end == 'c'))
131 
132  errno = 0;
133  layout = strtoll(name, &end, 0);
134  if (!errno && end - name == name_len)
135  return FFMAX(layout, 0);
136  return 0;
137 }
138 
139 uint64_t av_get_channel_layout(const char *name)
140 {
141  const char *n, *e;
142  const char *name_end = name + strlen(name);
143  int64_t layout = 0, layout_single;
144 
145  for (n = name; n < name_end; n = e + 1) {
146  for (e = n; e < name_end && *e != '+' && *e != '|'; e++);
147  layout_single = get_channel_layout_single(n, e - n);
148  if (!layout_single)
149  return 0;
150  layout |= layout_single;
151  }
152  return layout;
153 }
154 
155 int av_get_extended_channel_layout(const char *name, uint64_t* channel_layout, int* nb_channels)
156 {
157  int nb = 0;
158  char *end;
159  uint64_t layout = av_get_channel_layout(name);
160 
161  if (layout) {
162  *channel_layout = layout;
163  *nb_channels = av_get_channel_layout_nb_channels(layout);
164  return 0;
165  }
166 
167  nb = strtol(name, &end, 10);
168  if (!errno && *end == 'C' && *(end + 1) == '\0' && nb > 0 && nb < 64) {
169  *channel_layout = 0;
170  *nb_channels = nb;
171  return 0;
172  }
173 
174  return AVERROR(EINVAL);
175 }
176 
177 void av_bprint_channel_layout(struct AVBPrint *bp,
178  int nb_channels, uint64_t channel_layout)
179 {
180  int i;
181 
182  if (nb_channels <= 0)
183  nb_channels = av_get_channel_layout_nb_channels(channel_layout);
184 
185  for (i = 0; i < FF_ARRAY_ELEMS(channel_layout_map); i++)
186  if (nb_channels == channel_layout_map[i].nb_channels &&
187  channel_layout == channel_layout_map[i].layout) {
188  av_bprintf(bp, "%s", channel_layout_map[i].name);
189  return;
190  }
191 
192  av_bprintf(bp, "%d channels", nb_channels);
193  if (channel_layout) {
194  int i, ch;
195  av_bprintf(bp, " (");
196  for (i = 0, ch = 0; i < 64; i++) {
197  if ((channel_layout & (UINT64_C(1) << i))) {
198  const char *name = get_channel_name(i);
199  if (name) {
200  if (ch > 0)
201  av_bprintf(bp, "+");
202  av_bprintf(bp, "%s", name);
203  }
204  ch++;
205  }
206  }
207  av_bprintf(bp, ")");
208  }
209 }
210 
211 void av_get_channel_layout_string(char *buf, int buf_size,
212  int nb_channels, uint64_t channel_layout)
213 {
214  AVBPrint bp;
215 
216  av_bprint_init_for_buffer(&bp, buf, buf_size);
217  av_bprint_channel_layout(&bp, nb_channels, channel_layout);
218 }
219 
220 int av_get_channel_layout_nb_channels(uint64_t channel_layout)
221 {
222  return av_popcount64(channel_layout);
223 }
224 
226  int i;
227  for (i = 0; i < FF_ARRAY_ELEMS(channel_layout_map); i++)
228  if (nb_channels == channel_layout_map[i].nb_channels)
229  return channel_layout_map[i].layout;
230  return 0;
231 }
232 
233 int av_get_channel_layout_channel_index(uint64_t channel_layout,
234  uint64_t channel)
235 {
236  if (!(channel_layout & channel) ||
237  av_get_channel_layout_nb_channels(channel) != 1)
238  return AVERROR(EINVAL);
239  channel_layout &= channel - 1;
240  return av_get_channel_layout_nb_channels(channel_layout);
241 }
242 
243 const char *av_get_channel_name(uint64_t channel)
244 {
245  int i;
246  if (av_get_channel_layout_nb_channels(channel) != 1)
247  return NULL;
248  for (i = 0; i < 64; i++)
249  if ((1ULL<<i) & channel)
250  return get_channel_name(i);
251  return NULL;
252 }
253 
254 const char *av_get_channel_description(uint64_t channel)
255 {
256  int i;
257  if (av_get_channel_layout_nb_channels(channel) != 1)
258  return NULL;
259  for (i = 0; i < FF_ARRAY_ELEMS(channel_names); i++)
260  if ((1ULL<<i) & channel)
261  return channel_names[i].description;
262  return NULL;
263 }
264 
265 uint64_t av_channel_layout_extract_channel(uint64_t channel_layout, int index)
266 {
267  int i;
268 
269  if (av_get_channel_layout_nb_channels(channel_layout) <= index)
270  return 0;
271 
272  for (i = 0; i < 64; i++) {
273  if ((1ULL << i) & channel_layout && !index--)
274  return 1ULL << i;
275  }
276  return 0;
277 }
278 
280  const char **name)
281 {
282  if (index >= FF_ARRAY_ELEMS(channel_layout_map))
283  return AVERROR_EOF;
284  if (layout) *layout = channel_layout_map[index].layout;
285  if (name) *name = channel_layout_map[index].name;
286  return 0;
287 }
#define NULL
Definition: coverity.c:32
#define AV_CH_LAYOUT_7POINT1
#define AV_CH_LAYOUT_4POINT1
#define AV_CH_LAYOUT_HEXADECAGONAL
void av_bprintf(AVBPrint *buf, const char *fmt,...)
Definition: bprint.c:94
#define AV_CH_LAYOUT_6POINT1
#define AV_CH_LAYOUT_6POINT0
#define AV_CH_LAYOUT_SURROUND
static const char * get_channel_name(int channel_id)
uint8_t pi<< 24) CONV_FUNC(AV_SAMPLE_FMT_S64, int64_t, AV_SAMPLE_FMT_U8,(uint64_t)((*(const uint8_t *) pi - 0x80U))<< 56) CONV_FUNC(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8,(*(const uint8_t *) pi - 0x80) *(1.0f/(1<< 7))) CONV_FUNC(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8,(*(const uint8_t *) pi - 0x80) *(1.0/(1<< 7))) CONV_FUNC(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16,(*(const int16_t *) pi >>8)+0x80) CONV_FUNC(AV_SAMPLE_FMT_S64, int64_t, AV_SAMPLE_FMT_S16,(uint64_t)(*(const int16_t *) pi)<< 48) CONV_FUNC(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, *(const int16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, *(const int16_t *) pi *(1.0/(1<< 15))) CONV_FUNC(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32,(*(const int32_t *) pi >>24)+0x80) CONV_FUNC(AV_SAMPLE_FMT_S64, int64_t, AV_SAMPLE_FMT_S32,(uint64_t)(*(const int32_t *) pi)<< 32) CONV_FUNC(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, *(const int32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, *(const int32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S64,(*(const int64_t *) pi >>56)+0x80) CONV_FUNC(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S64, *(const int64_t *) pi *(1.0f/(INT64_C(1)<< 63))) CONV_FUNC(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S64, *(const int64_t *) pi *(1.0/(INT64_C(1)<< 63))) CONV_FUNC(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, av_clip_uint8(lrintf(*(const float *) pi *(1<< 7))+0x80)) CONV_FUNC(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, av_clip_int16(lrintf(*(const float *) pi *(1<< 15)))) CONV_FUNC(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, av_clipl_int32(llrintf(*(const float *) pi *(1U<< 31)))) CONV_FUNC(AV_SAMPLE_FMT_S64, int64_t, AV_SAMPLE_FMT_FLT, llrintf(*(const float *) pi *(INT64_C(1)<< 63))) CONV_FUNC(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, av_clip_uint8(lrint(*(const double *) pi *(1<< 7))+0x80)) CONV_FUNC(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, av_clip_int16(lrint(*(const double *) pi *(1<< 15)))) CONV_FUNC(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, av_clipl_int32(llrint(*(const double *) pi *(1U<< 31)))) CONV_FUNC(AV_SAMPLE_FMT_S64, int64_t, AV_SAMPLE_FMT_DBL, llrint(*(const double *) pi *(INT64_C(1)<< 63))) #define FMT_PAIR_FUNC(out, in) static conv_func_type *const fmt_pair_to_conv_functions[AV_SAMPLE_FMT_NB *AV_SAMPLE_FMT_NB]={ FMT_PAIR_FUNC(AV_SAMPLE_FMT_U8, AV_SAMPLE_FMT_U8), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_U8), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S32, AV_SAMPLE_FMT_U8), FMT_PAIR_FUNC(AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_U8), FMT_PAIR_FUNC(AV_SAMPLE_FMT_DBL, AV_SAMPLE_FMT_U8), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S64, AV_SAMPLE_FMT_U8), FMT_PAIR_FUNC(AV_SAMPLE_FMT_U8, AV_SAMPLE_FMT_S16), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_S16), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S32, AV_SAMPLE_FMT_S16), FMT_PAIR_FUNC(AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_S16), FMT_PAIR_FUNC(AV_SAMPLE_FMT_DBL, AV_SAMPLE_FMT_S16), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S64, AV_SAMPLE_FMT_S16), FMT_PAIR_FUNC(AV_SAMPLE_FMT_U8, AV_SAMPLE_FMT_S32), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_S32), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S32, AV_SAMPLE_FMT_S32), FMT_PAIR_FUNC(AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_S32), FMT_PAIR_FUNC(AV_SAMPLE_FMT_DBL, AV_SAMPLE_FMT_S32), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S64, AV_SAMPLE_FMT_S32), FMT_PAIR_FUNC(AV_SAMPLE_FMT_U8, AV_SAMPLE_FMT_FLT), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_FLT), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S32, AV_SAMPLE_FMT_FLT), FMT_PAIR_FUNC(AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_FLT), FMT_PAIR_FUNC(AV_SAMPLE_FMT_DBL, AV_SAMPLE_FMT_FLT), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S64, AV_SAMPLE_FMT_FLT), FMT_PAIR_FUNC(AV_SAMPLE_FMT_U8, AV_SAMPLE_FMT_DBL), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_DBL), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S32, AV_SAMPLE_FMT_DBL), FMT_PAIR_FUNC(AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_DBL), FMT_PAIR_FUNC(AV_SAMPLE_FMT_DBL, AV_SAMPLE_FMT_DBL), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S64, AV_SAMPLE_FMT_DBL), FMT_PAIR_FUNC(AV_SAMPLE_FMT_U8, AV_SAMPLE_FMT_S64), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_S64), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S32, AV_SAMPLE_FMT_S64), FMT_PAIR_FUNC(AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_S64), FMT_PAIR_FUNC(AV_SAMPLE_FMT_DBL, AV_SAMPLE_FMT_S64), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S64, AV_SAMPLE_FMT_S64), };static void cpy1(uint8_t **dst, const uint8_t **src, int len){ memcpy(*dst, *src, len);} static void cpy2(uint8_t **dst, const uint8_t **src, int len){ memcpy(*dst, *src, 2 *len);} static void cpy4(uint8_t **dst, const uint8_t **src, int len){ memcpy(*dst, *src, 4 *len);} static void cpy8(uint8_t **dst, const uint8_t **src, int len){ memcpy(*dst, *src, 8 *len);} AudioConvert *swri_audio_convert_alloc(enum AVSampleFormat out_fmt, enum AVSampleFormat in_fmt, int channels, const int *ch_map, int flags) { AudioConvert *ctx;conv_func_type *f=fmt_pair_to_conv_functions[av_get_packed_sample_fmt(out_fmt)+AV_SAMPLE_FMT_NB *av_get_packed_sample_fmt(in_fmt)];if(!f) return NULL;ctx=av_mallocz(sizeof(*ctx));if(!ctx) return NULL;if(channels==1){ in_fmt=av_get_planar_sample_fmt(in_fmt);out_fmt=av_get_planar_sample_fmt(out_fmt);} ctx->channels=channels;ctx->conv_f=f;ctx->ch_map=ch_map;if(in_fmt==AV_SAMPLE_FMT_U8||in_fmt==AV_SAMPLE_FMT_U8P) memset(ctx->silence, 0x80, sizeof(ctx->silence));if(out_fmt==in_fmt &&!ch_map) { switch(av_get_bytes_per_sample(in_fmt)){ case 1:ctx->simd_f=cpy1;break;case 2:ctx->simd_f=cpy2;break;case 4:ctx->simd_f=cpy4;break;case 8:ctx->simd_f=cpy8;break;} } if(HAVE_X86ASM &&HAVE_MMX) swri_audio_convert_init_x86(ctx, out_fmt, in_fmt, channels);if(ARCH_ARM) swri_audio_convert_init_arm(ctx, out_fmt, in_fmt, channels);if(ARCH_AARCH64) swri_audio_convert_init_aarch64(ctx, out_fmt, in_fmt, channels);return ctx;} void swri_audio_convert_free(AudioConvert **ctx) { av_freep(ctx);} int swri_audio_convert(AudioConvert *ctx, AudioData *out, AudioData *in, int len) { int ch;int off=0;const int os=(out->planar ? 1 :out->ch_count) *out->bps;unsigned misaligned=0;av_assert0(ctx->channels==out->ch_count);if(ctx->in_simd_align_mask) { int planes=in->planar ? in->ch_count :1;unsigned m=0;for(ch=0;ch< planes;ch++) m|=(intptr_t) in->ch[ch];misaligned|=m &ctx->in_simd_align_mask;} if(ctx->out_simd_align_mask) { int planes=out->planar ? out->ch_count :1;unsigned m=0;for(ch=0;ch< planes;ch++) m|=(intptr_t) out->ch[ch];misaligned|=m &ctx->out_simd_align_mask;} if(ctx->simd_f &&!ctx->ch_map &&!misaligned){ off=len &~15;av_assert1(off >=0);av_assert1(off<=len);av_assert2(ctx->channels==SWR_CH_MAX||!in->ch[ctx->channels]);if(off >0){ if(out->planar==in->planar){ int planes=out->planar ? out->ch_count :1;for(ch=0;ch< planes;ch++){ ctx->simd_f(out-> ch ch
Definition: audioconvert.c:56
Convenience header that includes libavutil&#39;s core.
#define AV_CH_LAYOUT_7POINT0_FRONT
#define AV_CH_LAYOUT_4POINT0
#define AV_CH_LAYOUT_7POINT0
#define AV_CH_LAYOUT_STEREO
const char * description
#define AV_CH_LAYOUT_5POINT0
int av_get_channel_layout_nb_channels(uint64_t channel_layout)
Return the number of channels in the channel layout.
int av_get_standard_channel_layout(unsigned index, uint64_t *layout, const char **name)
Get the value and name of a standard channel layout.
const char * name
uint64_t av_get_channel_layout(const char *name)
Return a channel layout id that matches name, or 0 if no match is found.
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:90
static const struct @242 channel_layout_map[]
#define AV_CH_LAYOUT_HEXAGONAL
void av_bprint_init_for_buffer(AVBPrint *buf, char *buffer, unsigned size)
Init a print buffer using a pre-existing buffer.
Definition: bprint.c:85
#define AVERROR_EOF
End of file.
Definition: error.h:55
#define AV_CH_LAYOUT_5POINT1
static const struct channel_name channel_names[]
#define AVERROR(e)
Definition: error.h:43
#define AV_CH_LAYOUT_QUAD
#define FFMAX(a, b)
Definition: common.h:94
#define AV_CH_LAYOUT_2_1
#define AV_CH_LAYOUT_2_2
#define AV_CH_LAYOUT_6POINT0_FRONT
audio channel layout utility functions
#define AV_CH_LAYOUT_STEREO_DOWNMIX
#define AV_CH_LAYOUT_3POINT1
int n
Definition: avisynth_c.h:684
#define AV_CH_LAYOUT_5POINT1_BACK
#define AV_CH_LAYOUT_6POINT1_BACK
#define FF_ARRAY_ELEMS(a)
void av_bprint_channel_layout(struct AVBPrint *bp, int nb_channels, uint64_t channel_layout)
Append a description of a channel layout to a bprint buffer.
void av_get_channel_layout_string(char *buf, int buf_size, int nb_channels, uint64_t channel_layout)
Return a description of a channel layout.
void * buf
Definition: avisynth_c.h:690
#define AV_CH_LAYOUT_7POINT1_WIDE_BACK
int index
Definition: gxfenc.c:89
#define AV_CH_LAYOUT_5POINT0_BACK
#define AV_CH_LAYOUT_OCTAGONAL
int av_get_channel_layout_channel_index(uint64_t channel_layout, uint64_t channel)
Get the index of a channel in channel_layout.
#define AV_CH_LAYOUT_7POINT1_WIDE
common internal and external API header
#define AV_CH_LAYOUT_2POINT1
uint64_t av_channel_layout_extract_channel(uint64_t channel_layout, int index)
Get the channel with the given index in channel_layout.
channel
Use these values when setting the channel map with ebur128_set_channel().
Definition: ebur128.h:39
static uint64_t get_channel_layout_single(const char *name, int name_len)
const char * av_get_channel_name(uint64_t channel)
Get the name of a given channel.
uint64_t layout
int64_t av_get_default_channel_layout(int nb_channels)
Return default channel layout for a given number of channels.
#define AV_CH_LAYOUT_6POINT1_FRONT
const char * av_get_channel_description(uint64_t channel)
Get the description of a given channel.
int nb_channels
#define AV_CH_LAYOUT_MONO
int av_get_extended_channel_layout(const char *name, uint64_t *channel_layout, int *nb_channels)
Return a channel layout and the number of channels based on the specified name.