1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
|
/*
* PCM codecs
* Copyright (c) 2001 Fabrice Bellard
*
* 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 libavcodec/pcm.c
* PCM codecs
*/
#include "avcodec.h"
#include "bitstream.h" // for ff_reverse
#include "bytestream.h"
#define MAX_CHANNELS 64
/* from g711.c by SUN microsystems (unrestricted use) */
#define SIGN_BIT (0x80) /* Sign bit for a A-law byte. */
#define QUANT_MASK (0xf) /* Quantization field mask. */
#define NSEGS (8) /* Number of A-law segments. */
#define SEG_SHIFT (4) /* Left shift for segment number. */
#define SEG_MASK (0x70) /* Segment field mask. */
#define BIAS (0x84) /* Bias for linear code. */
/*
* alaw2linear() - Convert an A-law value to 16-bit linear PCM
*
*/
static av_cold int alaw2linear(unsigned char a_val)
{
int t;
int seg;
a_val ^= 0x55;
t = a_val & QUANT_MASK;
seg = ((unsigned)a_val & SEG_MASK) >> SEG_SHIFT;
if(seg) t= (t + t + 1 + 32) << (seg + 2);
else t= (t + t + 1 ) << 3;
return (a_val & SIGN_BIT) ? t : -t;
}
static av_cold int ulaw2linear(unsigned char u_val)
{
int t;
/* Complement to obtain normal u-law value. */
u_val = ~u_val;
/*
* Extract and bias the quantization bits. Then
* shift up by the segment number and subtract out the bias.
*/
t = ((u_val & QUANT_MASK) << 3) + BIAS;
t <<= ((unsigned)u_val & SEG_MASK) >> SEG_SHIFT;
return (u_val & SIGN_BIT) ? (BIAS - t) : (t - BIAS);
}
/* 16384 entries per table */
static uint8_t linear_to_alaw[16384];
static uint8_t linear_to_ulaw[16384];
static av_cold void build_xlaw_table(uint8_t *linear_to_xlaw,
int (*xlaw2linear)(unsigned char),
int mask)
{
int i, j, v, v1, v2;
j = 0;
for(i=0;i<128;i++) {
if (i != 127) {
v1 = xlaw2linear(i ^ mask);
v2 = xlaw2linear((i + 1) ^ mask);
v = (v1 + v2 + 4) >> 3;
} else {
v = 8192;
}
for(;j<v;j++) {
linear_to_xlaw[8192 + j] = (i ^ mask);
if (j > 0)
linear_to_xlaw[8192 - j] = (i ^ (mask ^ 0x80));
}
}
linear_to_xlaw[0] = linear_to_xlaw[1];
}
static av_cold int pcm_encode_init(AVCodecContext *avctx)
{
avctx->frame_size = 1;
switch(avctx->codec->id) {
case CODEC_ID_PCM_ALAW:
build_xlaw_table(linear_to_alaw, alaw2linear, 0xd5);
break;
case CODEC_ID_PCM_MULAW:
build_xlaw_table(linear_to_ulaw, ulaw2linear, 0xff);
break;
default:
break;
}
avctx->bits_per_coded_sample = av_get_bits_per_sample(avctx->codec->id);
avctx->block_align = avctx->channels * avctx->bits_per_coded_sample/8;
avctx->coded_frame= avcodec_alloc_frame();
avctx->coded_frame->key_frame= 1;
return 0;
}
static av_cold int pcm_encode_close(AVCodecContext *avctx)
{
av_freep(&avctx->coded_frame);
return 0;
}
/**
* Write PCM samples macro
* @param type Datatype of native machine format
* @param endian bytestream_put_xxx() suffix
* @param src Source pointer (variable name)
* @param dst Destination pointer (variable name)
* @param n Total number of samples (variable name)
* @param shift Bitshift (bits)
* @param offset Sample value offset
*/
#define ENCODE(type, endian, src, dst, n, shift, offset) \
samples_##type = (type*)src; \
for(;n>0;n--) { \
register type v = (*samples_##type++ >> shift) + offset; \
bytestream_put_##endian(&dst, v); \
}
static int pcm_encode_frame(AVCodecContext *avctx,
unsigned char *frame, int buf_size, void *data)
{
int n, sample_size, v;
short *samples;
unsigned char *dst;
uint8_t *srcu8;
int16_t *samples_int16_t;
int32_t *samples_int32_t;
int64_t *samples_int64_t;
uint16_t *samples_uint16_t;
uint32_t *samples_uint32_t;
sample_size = av_get_bits_per_sample(avctx->codec->id)/8;
n = buf_size / sample_size;
samples = data;
dst = frame;
if (avctx->sample_fmt!=avctx->codec->sample_fmts[0]) {
av_log(avctx, AV_LOG_ERROR, "invalid sample_fmt\n");
return -1;
}
switch(avctx->codec->id) {
case CODEC_ID_PCM_U32LE:
ENCODE(uint32_t, le32, samples, dst, n, 0, 0x80000000)
break;
case CODEC_ID_PCM_U32BE:
ENCODE(uint32_t, be32, samples, dst, n, 0, 0x80000000)
break;
case CODEC_ID_PCM_S24LE:
ENCODE(int32_t, le24, samples, dst, n, 8, 0)
break;
case CODEC_ID_PCM_S24BE:
ENCODE(int32_t, be24, samples, dst, n, 8, 0)
break;
case CODEC_ID_PCM_U24LE:
ENCODE(uint32_t, le24, samples, dst, n, 8, 0x800000)
break;
case CODEC_ID_PCM_U24BE:
ENCODE(uint32_t, be24, samples, dst, n, 8, 0x800000)
break;
case CODEC_ID_PCM_S24DAUD:
for(;n>0;n--) {
uint32_t tmp = ff_reverse[(*samples >> 8) & 0xff] +
(ff_reverse[*samples & 0xff] << 8);
tmp <<= 4; // sync flags would go here
bytestream_put_be24(&dst, tmp);
samples++;
}
break;
case CODEC_ID_PCM_U16LE:
ENCODE(uint16_t, le16, samples, dst, n, 0, 0x8000)
break;
case CODEC_ID_PCM_U16BE:
ENCODE(uint16_t, be16, samples, dst, n, 0, 0x8000)
break;
case CODEC_ID_PCM_S8:
srcu8= data;
for(;n>0;n--) {
v = *srcu8++;
*dst++ = v - 128;
}
break;
#ifdef WORDS_BIGENDIAN
case CODEC_ID_PCM_F64LE:
ENCODE(int64_t, le64, samples, dst, n, 0, 0)
break;
case CODEC_ID_PCM_S32LE:
case CODEC_ID_PCM_F32LE:
ENCODE(int32_t, le32, samples, dst, n, 0, 0)
break;
case CODEC_ID_PCM_S16LE:
ENCODE(int16_t, le16, samples, dst, n, 0, 0)
break;
case CODEC_ID_PCM_F64BE:
case CODEC_ID_PCM_F32BE:
case CODEC_ID_PCM_S32BE:
case CODEC_ID_PCM_S16BE:
#else
case CODEC_ID_PCM_F64BE:
ENCODE(int64_t, be64, samples, dst, n, 0, 0)
break;
case CODEC_ID_PCM_F32BE:
case CODEC_ID_PCM_S32BE:
ENCODE(int32_t, be32, samples, dst, n, 0, 0)
break;
case CODEC_ID_PCM_S16BE:
ENCODE(int16_t, be16, samples, dst, n, 0, 0)
break;
case CODEC_ID_PCM_F64LE:
case CODEC_ID_PCM_F32LE:
case CODEC_ID_PCM_S32LE:
case CODEC_ID_PCM_S16LE:
#endif /* WORDS_BIGENDIAN */
case CODEC_ID_PCM_U8:
memcpy(dst, samples, n*sample_size);
dst += n*sample_size;
break;
case CODEC_ID_PCM_ZORK:
for(;n>0;n--) {
v= *samples++ >> 8;
if(v<0) v = -v;
else v+= 128;
*dst++ = v;
}
break;
case CODEC_ID_PCM_ALAW:
for(;n>0;n--) {
v = *samples++;
*dst++ = linear_to_alaw[(v + 32768) >> 2];
}
break;
case CODEC_ID_PCM_MULAW:
for(;n>0;n--) {
v = *samples++;
*dst++ = linear_to_ulaw[(v + 32768) >> 2];
}
break;
default:
return -1;
}
//avctx->frame_size = (dst - frame) / (sample_size * avctx->channels);
return dst - frame;
}
typedef struct PCMDecode {
short table[256];
} PCMDecode;
static av_cold int pcm_decode_init(AVCodecContext * avctx)
{
PCMDecode *s = avctx->priv_data;
int i;
switch(avctx->codec->id) {
case CODEC_ID_PCM_ALAW:
for(i=0;i<256;i++)
s->table[i] = alaw2linear(i);
break;
case CODEC_ID_PCM_MULAW:
for(i=0;i<256;i++)
s->table[i] = ulaw2linear(i);
break;
default:
break;
}
avctx->sample_fmt = avctx->codec->sample_fmts[0];
return 0;
}
/**
* Read PCM samples macro
* @param type Datatype of native machine format
* @param endian bytestream_get_xxx() endian suffix
* @param src Source pointer (variable name)
* @param dst Destination pointer (variable name)
* @param n Total number of samples (variable name)
* @param shift Bitshift (bits)
* @param offset Sample value offset
*/
#define DECODE(type, endian, src, dst, n, shift, offset) \
dst_##type = (type*)dst; \
for(;n>0;n--) { \
register type v = bytestream_get_##endian(&src); \
*dst_##type++ = (v - offset) << shift; \
} \
dst = (short*)dst_##type;
static int pcm_decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
PCMDecode *s = avctx->priv_data;
int sample_size, c, n;
short *samples;
const uint8_t *src, *src8, *src2[MAX_CHANNELS];
uint8_t *dstu8;
int16_t *dst_int16_t;
int32_t *dst_int32_t;
int64_t *dst_int64_t;
uint16_t *dst_uint16_t;
uint32_t *dst_uint32_t;
samples = data;
src = buf;
if (avctx->sample_fmt!=avctx->codec->sample_fmts[0]) {
av_log(avctx, AV_LOG_ERROR, "invalid sample_fmt\n");
return -1;
}
if(avctx->channels <= 0 || avctx->channels > MAX_CHANNELS){
av_log(avctx, AV_LOG_ERROR, "PCM channels out of bounds\n");
return -1;
}
sample_size = av_get_bits_per_sample(avctx->codec_id)/8;
/* av_get_bits_per_sample returns 0 for CODEC_ID_PCM_DVD */
if (CODEC_ID_PCM_DVD == avctx->codec_id)
/* 2 samples are interleaved per block in PCM_DVD */
sample_size = avctx->bits_per_coded_sample * 2 / 8;
n = avctx->channels * sample_size;
if(n && buf_size % n){
av_log(avctx, AV_LOG_ERROR, "invalid PCM packet\n");
return -1;
}
buf_size= FFMIN(buf_size, *data_size/2);
*data_size=0;
n = buf_size/sample_size;
switch(avctx->codec->id) {
case CODEC_ID_PCM_U32LE:
DECODE(uint32_t, le32, src, samples, n, 0, 0x80000000)
break;
case CODEC_ID_PCM_U32BE:
DECODE(uint32_t, be32, src, samples, n, 0, 0x80000000)
break;
case CODEC_ID_PCM_S24LE:
DECODE(int32_t, le24, src, samples, n, 8, 0)
break;
case CODEC_ID_PCM_S24BE:
DECODE(int32_t, be24, src, samples, n, 8, 0)
break;
case CODEC_ID_PCM_U24LE:
DECODE(uint32_t, le24, src, samples, n, 8, 0x800000)
break;
case CODEC_ID_PCM_U24BE:
DECODE(uint32_t, be24, src, samples, n, 8, 0x800000)
break;
case CODEC_ID_PCM_S24DAUD:
for(;n>0;n--) {
uint32_t v = bytestream_get_be24(&src);
v >>= 4; // sync flags are here
*samples++ = ff_reverse[(v >> 8) & 0xff] +
(ff_reverse[v & 0xff] << 8);
}
break;
case CODEC_ID_PCM_S16LE_PLANAR:
n /= avctx->channels;
for(c=0;c<avctx->channels;c++)
src2[c] = &src[c*n*2];
for(;n>0;n--)
for(c=0;c<avctx->channels;c++)
*samples++ = bytestream_get_le16(&src2[c]);
src = src2[avctx->channels-1];
break;
case CODEC_ID_PCM_U16LE:
DECODE(uint16_t, le16, src, samples, n, 0, 0x8000)
break;
case CODEC_ID_PCM_U16BE:
DECODE(uint16_t, be16, src, samples, n, 0, 0x8000)
break;
case CODEC_ID_PCM_S8:
dstu8= (uint8_t*)samples;
for(;n>0;n--) {
*dstu8++ = *src++ + 128;
}
samples= (short*)dstu8;
break;
#ifdef WORDS_BIGENDIAN
case CODEC_ID_PCM_F64LE:
DECODE(int64_t, le64, src, samples, n, 0, 0)
break;
case CODEC_ID_PCM_S32LE:
case CODEC_ID_PCM_F32LE:
DECODE(int32_t, le32, src, samples, n, 0, 0)
break;
case CODEC_ID_PCM_S16LE:
DECODE(int16_t, le16, src, samples, n, 0, 0)
break;
case CODEC_ID_PCM_F64BE:
case CODEC_ID_PCM_F32BE:
case CODEC_ID_PCM_S32BE:
case CODEC_ID_PCM_S16BE:
#else
case CODEC_ID_PCM_F64BE:
DECODE(int64_t, be64, src, samples, n, 0, 0)
break;
case CODEC_ID_PCM_F32BE:
case CODEC_ID_PCM_S32BE:
DECODE(int32_t, be32, src, samples, n, 0, 0)
break;
case CODEC_ID_PCM_S16BE:
DECODE(int16_t, be16, src, samples, n, 0, 0)
break;
case CODEC_ID_PCM_F64LE:
case CODEC_ID_PCM_F32LE:
case CODEC_ID_PCM_S32LE:
case CODEC_ID_PCM_S16LE:
#endif /* WORDS_BIGENDIAN */
case CODEC_ID_PCM_U8:
memcpy(samples, src, n*sample_size);
src += n*sample_size;
samples = (short*)((uint8_t*)data + n*sample_size);
break;
case CODEC_ID_PCM_ZORK:
for(;n>0;n--) {
int x= *src++;
if(x&128) x-= 128;
else x = -x;
*samples++ = x << 8;
}
break;
case CODEC_ID_PCM_ALAW:
case CODEC_ID_PCM_MULAW:
for(;n>0;n--) {
*samples++ = s->table[*src++];
}
break;
case CODEC_ID_PCM_DVD:
dst_int32_t = data;
n /= avctx->channels;
switch (avctx->bits_per_coded_sample) {
case 20:
while (n--) {
c = avctx->channels;
src8 = src + 4*c;
while (c--) {
*dst_int32_t++ = (bytestream_get_be16(&src) << 16) + ((*src8 &0xf0) << 8);
*dst_int32_t++ = (bytestream_get_be16(&src) << 16) + ((*src8++ &0x0f) << 12);
}
src = src8;
}
break;
case 24:
while (n--) {
c = avctx->channels;
src8 = src + 4*c;
while (c--) {
*dst_int32_t++ = (bytestream_get_be16(&src) << 16) + ((*src8++) << 8);
*dst_int32_t++ = (bytestream_get_be16(&src) << 16) + ((*src8++) << 8);
}
src = src8;
}
break;
default:
av_log(avctx, AV_LOG_ERROR, "PCM DVD unsupported sample depth\n");
return -1;
break;
}
samples = (short *) dst_int32_t;
break;
default:
return -1;
}
*data_size = (uint8_t *)samples - (uint8_t *)data;
return src - buf;
}
#if CONFIG_ENCODERS
#define PCM_ENCODER(id,sample_fmt_,name,long_name_) \
AVCodec name ## _encoder = { \
#name, \
CODEC_TYPE_AUDIO, \
id, \
0, \
pcm_encode_init, \
pcm_encode_frame, \
pcm_encode_close, \
NULL, \
.sample_fmts = (enum SampleFormat[]){sample_fmt_,SAMPLE_FMT_NONE}, \
.long_name = NULL_IF_CONFIG_SMALL(long_name_), \
};
#else
#define PCM_ENCODER(id,sample_fmt_,name,long_name_)
#endif
#if CONFIG_DECODERS
#define PCM_DECODER(id,sample_fmt_,name,long_name_) \
AVCodec name ## _decoder = { \
#name, \
CODEC_TYPE_AUDIO, \
id, \
sizeof(PCMDecode), \
pcm_decode_init, \
NULL, \
NULL, \
pcm_decode_frame, \
.sample_fmts = (enum SampleFormat[]){sample_fmt_,SAMPLE_FMT_NONE}, \
.long_name = NULL_IF_CONFIG_SMALL(long_name_), \
};
#else
#define PCM_DECODER(id,sample_fmt_,name,long_name_)
#endif
#define PCM_CODEC(id, sample_fmt_, name, long_name_) \
PCM_ENCODER(id,sample_fmt_,name,long_name_) PCM_DECODER(id,sample_fmt_,name,long_name_)
/* Note: Do not forget to add new entries to the Makefile as well. */
PCM_CODEC (CODEC_ID_PCM_ALAW, SAMPLE_FMT_S16, pcm_alaw, "PCM A-law");
PCM_CODEC (CODEC_ID_PCM_DVD, SAMPLE_FMT_S32, pcm_dvd, "PCM signed 20|24-bit big-endian");
PCM_CODEC (CODEC_ID_PCM_F32BE, SAMPLE_FMT_FLT, pcm_f32be, "PCM 32-bit floating point big-endian");
PCM_CODEC (CODEC_ID_PCM_F32LE, SAMPLE_FMT_FLT, pcm_f32le, "PCM 32-bit floating point little-endian");
PCM_CODEC (CODEC_ID_PCM_F64BE, SAMPLE_FMT_DBL, pcm_f64be, "PCM 64-bit floating point big-endian");
PCM_CODEC (CODEC_ID_PCM_F64LE, SAMPLE_FMT_DBL, pcm_f64le, "PCM 64-bit floating point little-endian");
PCM_CODEC (CODEC_ID_PCM_MULAW, SAMPLE_FMT_S16, pcm_mulaw, "PCM mu-law");
PCM_CODEC (CODEC_ID_PCM_S8, SAMPLE_FMT_U8, pcm_s8, "PCM signed 8-bit");
PCM_CODEC (CODEC_ID_PCM_S16BE, SAMPLE_FMT_S16, pcm_s16be, "PCM signed 16-bit big-endian");
PCM_CODEC (CODEC_ID_PCM_S16LE, SAMPLE_FMT_S16, pcm_s16le, "PCM signed 16-bit little-endian");
PCM_DECODER(CODEC_ID_PCM_S16LE_PLANAR, SAMPLE_FMT_S16, pcm_s16le_planar, "PCM 16-bit little-endian planar");
PCM_CODEC (CODEC_ID_PCM_S24BE, SAMPLE_FMT_S32, pcm_s24be, "PCM signed 24-bit big-endian");
PCM_CODEC (CODEC_ID_PCM_S24DAUD, SAMPLE_FMT_S16, pcm_s24daud, "PCM D-Cinema audio signed 24-bit");
PCM_CODEC (CODEC_ID_PCM_S24LE, SAMPLE_FMT_S32, pcm_s24le, "PCM signed 24-bit little-endian");
PCM_CODEC (CODEC_ID_PCM_S32BE, SAMPLE_FMT_S32, pcm_s32be, "PCM signed 32-bit big-endian");
PCM_CODEC (CODEC_ID_PCM_S32LE, SAMPLE_FMT_S32, pcm_s32le, "PCM signed 32-bit little-endian");
PCM_CODEC (CODEC_ID_PCM_U8, SAMPLE_FMT_U8, pcm_u8, "PCM unsigned 8-bit");
PCM_CODEC (CODEC_ID_PCM_U16BE, SAMPLE_FMT_S16, pcm_u16be, "PCM unsigned 16-bit big-endian");
PCM_CODEC (CODEC_ID_PCM_U16LE, SAMPLE_FMT_S16, pcm_u16le, "PCM unsigned 16-bit little-endian");
PCM_CODEC (CODEC_ID_PCM_U24BE, SAMPLE_FMT_S32, pcm_u24be, "PCM unsigned 24-bit big-endian");
PCM_CODEC (CODEC_ID_PCM_U24LE, SAMPLE_FMT_S32, pcm_u24le, "PCM unsigned 24-bit little-endian");
PCM_CODEC (CODEC_ID_PCM_U32BE, SAMPLE_FMT_S32, pcm_u32be, "PCM unsigned 32-bit big-endian");
PCM_CODEC (CODEC_ID_PCM_U32LE, SAMPLE_FMT_S32, pcm_u32le, "PCM unsigned 32-bit little-endian");
PCM_CODEC (CODEC_ID_PCM_ZORK, SAMPLE_FMT_S16, pcm_zork, "PCM Zork");
|