FFmpeg
samplefmt.c
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1 /*
2  * This file is part of FFmpeg.
3  *
4  * FFmpeg is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * FFmpeg is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with FFmpeg; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17  */
18 
19 #include "common.h"
20 #include "samplefmt.h"
21 
22 #include <stdio.h>
23 #include <stdlib.h>
24 #include <string.h>
25 
26 typedef struct SampleFmtInfo {
27  char name[8];
28  int bits;
29  int planar;
30  enum AVSampleFormat altform; ///< planar<->packed alternative form
32 
33 /** this table gives more information about formats */
35  [AV_SAMPLE_FMT_U8] = { .name = "u8", .bits = 8, .planar = 0, .altform = AV_SAMPLE_FMT_U8P },
36  [AV_SAMPLE_FMT_S16] = { .name = "s16", .bits = 16, .planar = 0, .altform = AV_SAMPLE_FMT_S16P },
37  [AV_SAMPLE_FMT_S32] = { .name = "s32", .bits = 32, .planar = 0, .altform = AV_SAMPLE_FMT_S32P },
38  [AV_SAMPLE_FMT_S64] = { .name = "s64", .bits = 64, .planar = 0, .altform = AV_SAMPLE_FMT_S64P },
39  [AV_SAMPLE_FMT_FLT] = { .name = "flt", .bits = 32, .planar = 0, .altform = AV_SAMPLE_FMT_FLTP },
40  [AV_SAMPLE_FMT_DBL] = { .name = "dbl", .bits = 64, .planar = 0, .altform = AV_SAMPLE_FMT_DBLP },
41  [AV_SAMPLE_FMT_U8P] = { .name = "u8p", .bits = 8, .planar = 1, .altform = AV_SAMPLE_FMT_U8 },
42  [AV_SAMPLE_FMT_S16P] = { .name = "s16p", .bits = 16, .planar = 1, .altform = AV_SAMPLE_FMT_S16 },
43  [AV_SAMPLE_FMT_S32P] = { .name = "s32p", .bits = 32, .planar = 1, .altform = AV_SAMPLE_FMT_S32 },
44  [AV_SAMPLE_FMT_S64P] = { .name = "s64p", .bits = 64, .planar = 1, .altform = AV_SAMPLE_FMT_S64 },
45  [AV_SAMPLE_FMT_FLTP] = { .name = "fltp", .bits = 32, .planar = 1, .altform = AV_SAMPLE_FMT_FLT },
46  [AV_SAMPLE_FMT_DBLP] = { .name = "dblp", .bits = 64, .planar = 1, .altform = AV_SAMPLE_FMT_DBL },
47 };
48 
49 const char *av_get_sample_fmt_name(enum AVSampleFormat sample_fmt)
50 {
51  if (sample_fmt < 0 || sample_fmt >= AV_SAMPLE_FMT_NB)
52  return NULL;
53  return sample_fmt_info[sample_fmt].name;
54 }
55 
57 {
58  int i;
59 
60  for (i = 0; i < AV_SAMPLE_FMT_NB; i++)
61  if (!strcmp(sample_fmt_info[i].name, name))
62  return i;
63  return AV_SAMPLE_FMT_NONE;
64 }
65 
67 {
68  if (sample_fmt < 0 || sample_fmt >= AV_SAMPLE_FMT_NB)
69  return AV_SAMPLE_FMT_NONE;
70  if (sample_fmt_info[sample_fmt].planar == planar)
71  return sample_fmt;
72  return sample_fmt_info[sample_fmt].altform;
73 }
74 
76 {
77  if (sample_fmt < 0 || sample_fmt >= AV_SAMPLE_FMT_NB)
78  return AV_SAMPLE_FMT_NONE;
79  if (sample_fmt_info[sample_fmt].planar)
80  return sample_fmt_info[sample_fmt].altform;
81  return sample_fmt;
82 }
83 
85 {
86  if (sample_fmt < 0 || sample_fmt >= AV_SAMPLE_FMT_NB)
87  return AV_SAMPLE_FMT_NONE;
88  if (sample_fmt_info[sample_fmt].planar)
89  return sample_fmt;
90  return sample_fmt_info[sample_fmt].altform;
91 }
92 
93 char *av_get_sample_fmt_string (char *buf, int buf_size, enum AVSampleFormat sample_fmt)
94 {
95  /* print header */
96  if (sample_fmt < 0)
97  snprintf(buf, buf_size, "name " " depth");
98  else if (sample_fmt < AV_SAMPLE_FMT_NB) {
99  SampleFmtInfo info = sample_fmt_info[sample_fmt];
100  snprintf (buf, buf_size, "%-6s" " %2d ", info.name, info.bits);
101  }
102 
103  return buf;
104 }
105 
107 {
108  return sample_fmt < 0 || sample_fmt >= AV_SAMPLE_FMT_NB ?
109  0 : sample_fmt_info[sample_fmt].bits >> 3;
110 }
111 
113 {
114  if (sample_fmt < 0 || sample_fmt >= AV_SAMPLE_FMT_NB)
115  return 0;
116  return sample_fmt_info[sample_fmt].planar;
117 }
118 
119 int av_samples_get_buffer_size(int *linesize, int nb_channels, int nb_samples,
120  enum AVSampleFormat sample_fmt, int align)
121 {
122  int line_size;
123  int sample_size = av_get_bytes_per_sample(sample_fmt);
124  int planar = av_sample_fmt_is_planar(sample_fmt);
125 
126  /* validate parameter ranges */
127  if (!sample_size || nb_samples <= 0 || nb_channels <= 0)
128  return AVERROR(EINVAL);
129 
130  /* auto-select alignment if not specified */
131  if (!align) {
132  if (nb_samples > INT_MAX - 31)
133  return AVERROR(EINVAL);
134  align = 1;
135  nb_samples = FFALIGN(nb_samples, 32);
136  }
137 
138  /* check for integer overflow */
139  if (nb_channels > INT_MAX / align ||
140  (int64_t)nb_channels * nb_samples > (INT_MAX - (align * nb_channels)) / sample_size)
141  return AVERROR(EINVAL);
142 
143  line_size = planar ? FFALIGN(nb_samples * sample_size, align) :
144  FFALIGN(nb_samples * sample_size * nb_channels, align);
145  if (linesize)
146  *linesize = line_size;
147 
148  return planar ? line_size * nb_channels : line_size;
149 }
150 
151 int av_samples_fill_arrays(uint8_t **audio_data, int *linesize,
152  const uint8_t *buf, int nb_channels, int nb_samples,
153  enum AVSampleFormat sample_fmt, int align)
154 {
155  int ch, planar, buf_size, line_size;
156 
157  planar = av_sample_fmt_is_planar(sample_fmt);
158  buf_size = av_samples_get_buffer_size(&line_size, nb_channels, nb_samples,
159  sample_fmt, align);
160  if (buf_size < 0)
161  return buf_size;
162 
163  audio_data[0] = (uint8_t *)buf;
164  for (ch = 1; planar && ch < nb_channels; ch++)
165  audio_data[ch] = audio_data[ch-1] + line_size;
166 
167  if (linesize)
168  *linesize = line_size;
169 
170  return buf_size;
171 }
172 
173 int av_samples_alloc(uint8_t **audio_data, int *linesize, int nb_channels,
174  int nb_samples, enum AVSampleFormat sample_fmt, int align)
175 {
176  uint8_t *buf;
177  int size = av_samples_get_buffer_size(NULL, nb_channels, nb_samples,
178  sample_fmt, align);
179  if (size < 0)
180  return size;
181 
182  buf = av_malloc(size);
183  if (!buf)
184  return AVERROR(ENOMEM);
185 
186  size = av_samples_fill_arrays(audio_data, linesize, buf, nb_channels,
187  nb_samples, sample_fmt, align);
188  if (size < 0) {
189  av_free(buf);
190  return size;
191  }
192 
193  av_samples_set_silence(audio_data, 0, nb_samples, nb_channels, sample_fmt);
194 
195  return size;
196 }
197 
198 int av_samples_alloc_array_and_samples(uint8_t ***audio_data, int *linesize, int nb_channels,
199  int nb_samples, enum AVSampleFormat sample_fmt, int align)
200 {
201  int ret, nb_planes = av_sample_fmt_is_planar(sample_fmt) ? nb_channels : 1;
202 
203  *audio_data = av_calloc(nb_planes, sizeof(**audio_data));
204  if (!*audio_data)
205  return AVERROR(ENOMEM);
206  ret = av_samples_alloc(*audio_data, linesize, nb_channels,
207  nb_samples, sample_fmt, align);
208  if (ret < 0)
209  av_freep(audio_data);
210  return ret;
211 }
212 
213 int av_samples_copy(uint8_t **dst, uint8_t * const *src, int dst_offset,
214  int src_offset, int nb_samples, int nb_channels,
215  enum AVSampleFormat sample_fmt)
216 {
217  int planar = av_sample_fmt_is_planar(sample_fmt);
218  int planes = planar ? nb_channels : 1;
219  int block_align = av_get_bytes_per_sample(sample_fmt) * (planar ? 1 : nb_channels);
220  int data_size = nb_samples * block_align;
221  int i;
222 
223  dst_offset *= block_align;
224  src_offset *= block_align;
225 
226  if((dst[0] < src[0] ? src[0] - dst[0] : dst[0] - src[0]) >= data_size) {
227  for (i = 0; i < planes; i++)
228  memcpy(dst[i] + dst_offset, src[i] + src_offset, data_size);
229  } else {
230  for (i = 0; i < planes; i++)
231  memmove(dst[i] + dst_offset, src[i] + src_offset, data_size);
232  }
233 
234  return 0;
235 }
236 
237 int av_samples_set_silence(uint8_t **audio_data, int offset, int nb_samples,
238  int nb_channels, enum AVSampleFormat sample_fmt)
239 {
240  int planar = av_sample_fmt_is_planar(sample_fmt);
241  int planes = planar ? nb_channels : 1;
242  int block_align = av_get_bytes_per_sample(sample_fmt) * (planar ? 1 : nb_channels);
243  int data_size = nb_samples * block_align;
244  int fill_char = (sample_fmt == AV_SAMPLE_FMT_U8 ||
245  sample_fmt == AV_SAMPLE_FMT_U8P) ? 0x80 : 0x00;
246  int i;
247 
248  offset *= block_align;
249 
250  for (i = 0; i < planes; i++)
251  memset(audio_data[i] + offset, fill_char, data_size);
252 
253  return 0;
254 }
float, planar
Definition: samplefmt.h:69
#define NULL
Definition: coverity.c:32
Number of sample formats. DO NOT USE if linking dynamically.
Definition: samplefmt.h:74
char * av_get_sample_fmt_string(char *buf, int buf_size, enum AVSampleFormat sample_fmt)
Generate a string corresponding to the sample format with sample_fmt, or a header if sample_fmt is ne...
Definition: samplefmt.c:93
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 &&1) 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
double, planar
Definition: samplefmt.h:70
enum AVSampleFormat altform
planar<->packed alternative form
Definition: samplefmt.c:30
#define src
Definition: vp8dsp.c:254
int av_samples_alloc_array_and_samples(uint8_t ***audio_data, int *linesize, int nb_channels, int nb_samples, enum AVSampleFormat sample_fmt, int align)
Allocate a data pointers array, samples buffer for nb_samples samples, and fill data pointers and lin...
Definition: samplefmt.c:198
static const SampleFmtInfo sample_fmt_info[AV_SAMPLE_FMT_NB]
this table gives more information about formats
Definition: samplefmt.c:34
void * av_calloc(size_t nmemb, size_t size)
Non-inlined equivalent of av_mallocz_array().
Definition: mem.c:244
uint8_t
#define av_malloc(s)
AV_SAMPLE_FMT_U8
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf offset
enum AVSampleFormat av_get_planar_sample_fmt(enum AVSampleFormat sample_fmt)
Get the planar alternative form of the given sample format.
Definition: samplefmt.c:84
ptrdiff_t size
Definition: opengl_enc.c:100
signed 32 bits
Definition: samplefmt.h:62
#define FFALIGN(x, a)
Definition: macros.h:48
int av_sample_fmt_is_planar(enum AVSampleFormat sample_fmt)
Check if the sample format is planar.
Definition: samplefmt.c:112
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:259
int av_samples_set_silence(uint8_t **audio_data, int offset, int nb_samples, int nb_channels, enum AVSampleFormat sample_fmt)
Fill an audio buffer with silence.
Definition: samplefmt.c:237
const char * av_get_sample_fmt_name(enum AVSampleFormat sample_fmt)
Return the name of sample_fmt, or NULL if sample_fmt is not recognized.
Definition: samplefmt.c:49
MIPS optimizations info
Definition: mips.txt:2
signed 32 bits, planar
Definition: samplefmt.h:68
signed 64 bits
Definition: samplefmt.h:71
unsigned 8 bits, planar
Definition: samplefmt.h:66
static const struct @316 planes[]
const AVS_VideoInfo int align
Definition: avisynth_c.h:887
int av_samples_alloc(uint8_t **audio_data, int *linesize, int nb_channels, int nb_samples, enum AVSampleFormat sample_fmt, int align)
Allocate a samples buffer for nb_samples samples, and fill data pointers and linesize accordingly...
Definition: samplefmt.c:173
AVSampleFormat
Audio sample formats.
Definition: samplefmt.h:58
int av_samples_copy(uint8_t **dst, uint8_t *const *src, int dst_offset, int src_offset, int nb_samples, int nb_channels, enum AVSampleFormat sample_fmt)
Copy samples from src to dst.
Definition: samplefmt.c:213
void * buf
Definition: avisynth_c.h:766
int av_samples_get_buffer_size(int *linesize, int nb_channels, int nb_samples, enum AVSampleFormat sample_fmt, int align)
Get the required buffer size for the given audio parameters.
Definition: samplefmt.c:119
enum AVSampleFormat av_get_sample_fmt(const char *name)
Return a sample format corresponding to name, or AV_SAMPLE_FMT_NONE on error.
Definition: samplefmt.c:56
#define snprintf
Definition: snprintf.h:34
int av_get_bytes_per_sample(enum AVSampleFormat sample_fmt)
Return number of bytes per sample.
Definition: samplefmt.c:106
enum AVSampleFormat av_get_alt_sample_fmt(enum AVSampleFormat sample_fmt, int planar)
Return the planar<->packed alternative form of the given sample format, or AV_SAMPLE_FMT_NONE on erro...
Definition: samplefmt.c:66
common internal and external API header
enum AVSampleFormat av_get_packed_sample_fmt(enum AVSampleFormat sample_fmt)
Get the packed alternative form of the given sample format.
Definition: samplefmt.c:75
signed 16 bits
Definition: samplefmt.h:61
char name[8]
Definition: samplefmt.c:27
int av_samples_fill_arrays(uint8_t **audio_data, int *linesize, const uint8_t *buf, int nb_channels, int nb_samples, enum AVSampleFormat sample_fmt, int align)
Fill plane data pointers and linesize for samples with sample format sample_fmt.
Definition: samplefmt.c:151
#define av_free(p)
signed 64 bits, planar
Definition: samplefmt.h:72
#define av_freep(p)
signed 16 bits, planar
Definition: samplefmt.h:67
int nb_channels
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later.That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another.Frame references ownership and permissions
const char * name
Definition: opengl_enc.c:102