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tta.c
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1 /*
2  * TTA (The Lossless True Audio) decoder
3  * Copyright (c) 2006 Alex Beregszaszi
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 /**
23  * @file
24  * TTA (The Lossless True Audio) decoder
25  * @see http://www.true-audio.com/
26  * @see http://tta.corecodec.org/
27  * @author Alex Beregszaszi
28  */
29 
30 #include <limits.h>
31 
32 #include "libavutil/crc.h"
33 #include "libavutil/intreadwrite.h"
34 #include "libavutil/opt.h"
35 
36 #define BITSTREAM_READER_LE
37 #include "ttadata.h"
38 #include "ttadsp.h"
39 #include "avcodec.h"
40 #include "get_bits.h"
41 #include "thread.h"
42 #include "unary.h"
43 #include "internal.h"
44 
45 #define FORMAT_SIMPLE 1
46 #define FORMAT_ENCRYPTED 2
47 
48 typedef struct TTAContext {
49  AVClass *class;
51  const AVCRC *crc_table;
52 
54  unsigned data_length;
56 
58 
63 } TTAContext;
64 
65 static const int64_t tta_channel_layouts[7] = {
69  0,
71  AV_CH_LAYOUT_5POINT1_BACK|AV_CH_BACK_CENTER,
73 };
74 
75 static int tta_check_crc(TTAContext *s, const uint8_t *buf, int buf_size)
76 {
77  uint32_t crc, CRC;
78 
79  CRC = AV_RL32(buf + buf_size);
80  crc = av_crc(s->crc_table, 0xFFFFFFFFU, buf, buf_size);
81  if (CRC != (crc ^ 0xFFFFFFFFU)) {
82  av_log(s->avctx, AV_LOG_ERROR, "CRC error\n");
83  return AVERROR_INVALIDDATA;
84  }
85 
86  return 0;
87 }
88 
89 static uint64_t tta_check_crc64(uint8_t *pass)
90 {
91  uint64_t crc = UINT64_MAX, poly = 0x42F0E1EBA9EA3693U;
92  uint8_t *end = pass + strlen(pass);
93  int i;
94 
95  while (pass < end) {
96  crc ^= (uint64_t)*pass++ << 56;
97  for (i = 0; i < 8; i++)
98  crc = (crc << 1) ^ (poly & (((int64_t) crc) >> 63));
99  }
100 
101  return crc ^ UINT64_MAX;
102 }
103 
105 {
106  TTAContext *s = avctx->priv_data;
107 
108  if (s->bps < 3) {
110  if (!s->decode_buffer)
111  return AVERROR(ENOMEM);
112  } else
113  s->decode_buffer = NULL;
114  s->ch_ctx = av_malloc_array(avctx->channels, sizeof(*s->ch_ctx));
115  if (!s->ch_ctx) {
116  av_freep(&s->decode_buffer);
117  return AVERROR(ENOMEM);
118  }
119 
120  return 0;
121 }
122 
124 {
125  TTAContext *s = avctx->priv_data;
126  GetBitContext gb;
127  int total_frames;
128  int ret;
129 
130  s->avctx = avctx;
131 
132  // 30bytes includes TTA1 header
133  if (avctx->extradata_size < 22)
134  return AVERROR_INVALIDDATA;
135 
137  ret = init_get_bits8(&gb, avctx->extradata, avctx->extradata_size);
138  if (ret < 0)
139  return ret;
140 
141  if (show_bits_long(&gb, 32) == AV_RL32("TTA1")) {
142  /* signature */
143  skip_bits_long(&gb, 32);
144 
145  s->format = get_bits(&gb, 16);
146  if (s->format > 2) {
147  av_log(avctx, AV_LOG_ERROR, "Invalid format\n");
148  return AVERROR_INVALIDDATA;
149  }
150  if (s->format == FORMAT_ENCRYPTED) {
151  if (!s->pass) {
152  av_log(avctx, AV_LOG_ERROR, "Missing password for encrypted stream. Please use the -password option\n");
153  return AVERROR(EINVAL);
154  }
156  }
157  avctx->channels = s->channels = get_bits(&gb, 16);
158  if (s->channels > 1 && s->channels < 9)
160  avctx->bits_per_raw_sample = get_bits(&gb, 16);
161  s->bps = (avctx->bits_per_raw_sample + 7) / 8;
162  avctx->sample_rate = get_bits_long(&gb, 32);
163  s->data_length = get_bits_long(&gb, 32);
164  skip_bits_long(&gb, 32); // CRC32 of header
165 
166  if (s->channels == 0) {
167  av_log(avctx, AV_LOG_ERROR, "Invalid number of channels\n");
168  return AVERROR_INVALIDDATA;
169  } else if (avctx->sample_rate == 0) {
170  av_log(avctx, AV_LOG_ERROR, "Invalid samplerate\n");
171  return AVERROR_INVALIDDATA;
172  }
173 
174  switch(s->bps) {
175  case 1: avctx->sample_fmt = AV_SAMPLE_FMT_U8; break;
176  case 2:
177  avctx->sample_fmt = AV_SAMPLE_FMT_S16;
178  break;
179  case 3:
180  avctx->sample_fmt = AV_SAMPLE_FMT_S32;
181  break;
182  //case 4: avctx->sample_fmt = AV_SAMPLE_FMT_S32; break;
183  default:
184  av_log(avctx, AV_LOG_ERROR, "Invalid/unsupported sample format.\n");
185  return AVERROR_INVALIDDATA;
186  }
187 
188  // prevent overflow
189  if (avctx->sample_rate > 0x7FFFFFu) {
190  av_log(avctx, AV_LOG_ERROR, "sample_rate too large\n");
191  return AVERROR(EINVAL);
192  }
193  s->frame_length = 256 * avctx->sample_rate / 245;
194 
196  total_frames = s->data_length / s->frame_length +
197  (s->last_frame_length ? 1 : 0);
198 
199  av_log(avctx, AV_LOG_DEBUG, "format: %d chans: %d bps: %d rate: %d block: %d\n",
200  s->format, avctx->channels, avctx->bits_per_coded_sample, avctx->sample_rate,
201  avctx->block_align);
202  av_log(avctx, AV_LOG_DEBUG, "data_length: %d frame_length: %d last: %d total: %d\n",
203  s->data_length, s->frame_length, s->last_frame_length, total_frames);
204 
205  if(s->frame_length >= UINT_MAX / (s->channels * sizeof(int32_t))){
206  av_log(avctx, AV_LOG_ERROR, "frame_length too large\n");
207  return AVERROR_INVALIDDATA;
208  }
209  } else {
210  av_log(avctx, AV_LOG_ERROR, "Wrong extradata present\n");
211  return AVERROR_INVALIDDATA;
212  }
213 
214  ff_ttadsp_init(&s->dsp);
215 
216  return allocate_buffers(avctx);
217 }
218 
219 static int tta_decode_frame(AVCodecContext *avctx, void *data,
220  int *got_frame_ptr, AVPacket *avpkt)
221 {
222  AVFrame *frame = data;
223  ThreadFrame tframe = { .f = data };
224  const uint8_t *buf = avpkt->data;
225  int buf_size = avpkt->size;
226  TTAContext *s = avctx->priv_data;
227  GetBitContext gb;
228  int i, ret;
229  int cur_chan = 0, framelen = s->frame_length;
230  int32_t *p;
231 
232  if (avctx->err_recognition & AV_EF_CRCCHECK) {
233  if (buf_size < 4 ||
234  (tta_check_crc(s, buf, buf_size - 4) && avctx->err_recognition & AV_EF_EXPLODE))
235  return AVERROR_INVALIDDATA;
236  }
237 
238  if ((ret = init_get_bits8(&gb, avpkt->data, avpkt->size)) < 0)
239  return ret;
240 
241  /* get output buffer */
242  frame->nb_samples = framelen;
243  if ((ret = ff_thread_get_buffer(avctx, &tframe, 0)) < 0)
244  return ret;
245 
246  // decode directly to output buffer for 24-bit sample format
247  if (s->bps == 3)
248  s->decode_buffer = (int32_t *)frame->data[0];
249 
250  // init per channel states
251  for (i = 0; i < s->channels; i++) {
252  TTAFilter *filter = &s->ch_ctx[i].filter;
253  s->ch_ctx[i].predictor = 0;
255  if (s->format == FORMAT_ENCRYPTED) {
256  int i;
257  for (i = 0; i < 8; i++)
258  filter->qm[i] = sign_extend(s->crc_pass[i], 8);
259  }
260  ff_tta_rice_init(&s->ch_ctx[i].rice, 10, 10);
261  }
262 
263  i = 0;
264  for (p = s->decode_buffer; p < s->decode_buffer + (framelen * s->channels); p++) {
265  int32_t *predictor = &s->ch_ctx[cur_chan].predictor;
266  TTAFilter *filter = &s->ch_ctx[cur_chan].filter;
267  TTARice *rice = &s->ch_ctx[cur_chan].rice;
268  uint32_t unary, depth, k;
269  int32_t value;
270 
271  unary = get_unary(&gb, 0, get_bits_left(&gb));
272 
273  if (unary == 0) {
274  depth = 0;
275  k = rice->k0;
276  } else {
277  depth = 1;
278  k = rice->k1;
279  unary--;
280  }
281 
282  if (get_bits_left(&gb) < k) {
283  ret = AVERROR_INVALIDDATA;
284  goto error;
285  }
286 
287  if (k) {
288  if (k > MIN_CACHE_BITS) {
289  ret = AVERROR_INVALIDDATA;
290  goto error;
291  }
292  value = (unary << k) + get_bits(&gb, k);
293  } else
294  value = unary;
295 
296  // FIXME: copy paste from original
297  switch (depth) {
298  case 1:
299  rice->sum1 += value - (rice->sum1 >> 4);
300  if (rice->k1 > 0 && rice->sum1 < ff_tta_shift_16[rice->k1])
301  rice->k1--;
302  else if(rice->sum1 > ff_tta_shift_16[rice->k1 + 1])
303  rice->k1++;
304  value += ff_tta_shift_1[rice->k0];
305  default:
306  rice->sum0 += value - (rice->sum0 >> 4);
307  if (rice->k0 > 0 && rice->sum0 < ff_tta_shift_16[rice->k0])
308  rice->k0--;
309  else if(rice->sum0 > ff_tta_shift_16[rice->k0 + 1])
310  rice->k0++;
311  }
312 
313  // extract coded value
314  *p = 1 + ((value >> 1) ^ ((value & 1) - 1));
315 
316  // run hybrid filter
317  s->dsp.filter_process(filter->qm, filter->dx, filter->dl, &filter->error, p,
318  filter->shift, filter->round);
319 
320  // fixed order prediction
321 #define PRED(x, k) (int32_t)((((uint64_t)(x) << (k)) - (x)) >> (k))
322  switch (s->bps) {
323  case 1: *p += PRED(*predictor, 4); break;
324  case 2:
325  case 3: *p += PRED(*predictor, 5); break;
326  case 4: *p += *predictor; break;
327  }
328  *predictor = *p;
329 
330  // flip channels
331  if (cur_chan < (s->channels-1))
332  cur_chan++;
333  else {
334  // decorrelate in case of multiple channels
335  if (s->channels > 1) {
336  int32_t *r = p - 1;
337  for (*p += *r / 2; r > p - s->channels; r--)
338  *r = *(r + 1) - *r;
339  }
340  cur_chan = 0;
341  i++;
342  // check for last frame
343  if (i == s->last_frame_length && get_bits_left(&gb) / 8 == 4) {
344  frame->nb_samples = framelen = s->last_frame_length;
345  break;
346  }
347  }
348  }
349 
350  align_get_bits(&gb);
351  if (get_bits_left(&gb) < 32) {
352  ret = AVERROR_INVALIDDATA;
353  goto error;
354  }
355  skip_bits_long(&gb, 32); // frame crc
356 
357  // convert to output buffer
358  switch (s->bps) {
359  case 1: {
360  uint8_t *samples = (uint8_t *)frame->data[0];
361  for (p = s->decode_buffer; p < s->decode_buffer + (framelen * s->channels); p++)
362  *samples++ = *p + 0x80;
363  break;
364  }
365  case 2: {
366  int16_t *samples = (int16_t *)frame->data[0];
367  for (p = s->decode_buffer; p < s->decode_buffer + (framelen * s->channels); p++)
368  *samples++ = *p;
369  break;
370  }
371  case 3: {
372  // shift samples for 24-bit sample format
373  int32_t *samples = (int32_t *)frame->data[0];
374  for (i = 0; i < framelen * s->channels; i++)
375  *samples++ <<= 8;
376  // reset decode buffer
377  s->decode_buffer = NULL;
378  break;
379  }
380  }
381 
382  *got_frame_ptr = 1;
383 
384  return buf_size;
385 error:
386  // reset decode buffer
387  if (s->bps == 3)
388  s->decode_buffer = NULL;
389  return ret;
390 }
391 
393 {
394  TTAContext *s = avctx->priv_data;
395  s->avctx = avctx;
396  return allocate_buffers(avctx);
397 }
398 
400  TTAContext *s = avctx->priv_data;
401 
402  if (s->bps < 3)
403  av_freep(&s->decode_buffer);
404  s->decode_buffer = NULL;
405  av_freep(&s->ch_ctx);
406 
407  return 0;
408 }
409 
410 #define OFFSET(x) offsetof(TTAContext, x)
411 #define DEC (AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM)
412 static const AVOption options[] = {
413  { "password", "Set decoding password", OFFSET(pass), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, DEC },
414  { NULL },
415 };
416 
417 static const AVClass tta_decoder_class = {
418  .class_name = "TTA Decoder",
419  .item_name = av_default_item_name,
420  .option = options,
421  .version = LIBAVUTIL_VERSION_INT,
422 };
423 
425  .name = "tta",
426  .long_name = NULL_IF_CONFIG_SMALL("TTA (True Audio)"),
427  .type = AVMEDIA_TYPE_AUDIO,
428  .id = AV_CODEC_ID_TTA,
429  .priv_data_size = sizeof(TTAContext),
431  .close = tta_decode_close,
435  .priv_class = &tta_decoder_class,
436 };
static unsigned int show_bits_long(GetBitContext *s, int n)
Show 0-32 bits.
Definition: get_bits.h:382
static int tta_check_crc(TTAContext *s, const uint8_t *buf, int buf_size)
Definition: tta.c:75
#define NULL
Definition: coverity.c:32
uint32_t poly
Definition: crc.c:297
const char * s
Definition: avisynth_c.h:768
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
This structure describes decoded (raw) audio or video data.
Definition: frame.h:190
AVOption.
Definition: opt.h:246
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
TTAChannel * ch_ctx
Definition: tta.c:61
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:247
static int init_thread_copy(AVCodecContext *avctx)
Definition: tta.c:392
AVFrame * f
Definition: thread.h:36
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
static void skip_bits_long(GetBitContext *s, int n)
Definition: get_bits.h:204
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
static av_cold int tta_decode_init(AVCodecContext *avctx)
Definition: tta.c:123
static int tta_decode_frame(AVCodecContext *avctx, void *data, int *got_frame_ptr, AVPacket *avpkt)
Definition: tta.c:219
void ff_tta_rice_init(TTARice *c, uint32_t k0, uint32_t k1)
Definition: ttadata.c:40
int size
Definition: avcodec.h:1608
int32_t predictor
Definition: ttadata.h:39
Definition: tta.c:48
int format
Definition: tta.c:53
int bps
Definition: tta.c:53
int bits_per_raw_sample
Bits per sample/pixel of internal libavcodec pixel/sample format.
Definition: avcodec.h:3084
#define AV_CH_LAYOUT_STEREO
static const int64_t tta_channel_layouts[7]
Definition: tta.c:65
AVCodec.
Definition: avcodec.h:3607
int block_align
number of bytes per packet if constant and known or 0 Used by some WAV based audio codecs...
Definition: avcodec.h:2481
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:72
int32_t error
Definition: ttadata.h:28
int32_t round
Definition: ttadata.h:28
static av_cold int tta_decode_close(AVCodecContext *avctx)
Definition: tta.c:399
enum AVSampleFormat sample_fmt
audio sample format
Definition: avcodec.h:2452
uint8_t
#define av_cold
Definition: attributes.h:82
AV_SAMPLE_FMT_U8
AVOptions.
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:90
Multithreading support functions.
TTADSPContext dsp
Definition: tta.c:62
static uint64_t tta_check_crc64(uint8_t *pass)
Definition: tta.c:89
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1797
static void filter(int16_t *output, ptrdiff_t out_stride, int16_t *low, ptrdiff_t low_stride, int16_t *high, ptrdiff_t high_stride, int len, uint8_t clip)
Definition: cfhd.c:80
#define AV_CH_LOW_FREQUENCY
static AVFrame * frame
Public header for CRC hash function implementation.
uint8_t * data
Definition: avcodec.h:1607
static const AVOption options[]
Definition: tta.c:412
int32_t qm[MAX_ORDER]
Definition: ttadata.h:29
bitstream reader API header.
int32_t shift
Definition: ttadata.h:28
av_cold void ff_ttadsp_init(TTADSPContext *c)
Definition: ttadsp.c:53
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:3077
uint8_t crc_pass[8]
Definition: tta.c:59
signed 32 bits
Definition: samplefmt.h:62
#define av_log(a,...)
static void predictor(uint8_t *src, int size)
Definition: exr.c:254
#define U(x)
Definition: vp56_arith.h:37
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:572
#define AV_WL64(p, v)
Definition: intreadwrite.h:440
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
static int allocate_buffers(AVCodecContext *avctx)
Definition: tta.c:104
av_default_item_name
#define AVERROR(e)
Definition: error.h:43
AVCodec ff_tta_decoder
Definition: tta.c:424
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:176
const char * r
Definition: vf_curves.c:111
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
#define AV_CH_LAYOUT_QUAD
const char * name
Name of the codec implementation.
Definition: avcodec.h:3614
static void error(const char *err)
static void * av_mallocz_array(size_t nmemb, size_t size)
Definition: mem.h:226
#define AV_CODEC_CAP_FRAME_THREADS
Codec supports frame-level multithreading.
Definition: avcodec.h:1022
#define OFFSET(x)
Definition: tta.c:410
const AVCRC * crc_table
Definition: tta.c:51
int depth
Definition: v4l.c:62
uint32_t sum1
Definition: ttadata.h:35
uint64_t channel_layout
Audio channel layout.
Definition: avcodec.h:2495
#define pass
Definition: fft_template.c:532
#define ONLY_IF_THREADS_ENABLED(x)
Define a function with only the non-default version specified.
Definition: internal.h:215
unsigned data_length
Definition: tta.c:54
const uint32_t ff_tta_shift_1[]
Definition: ttadata.c:23
int err_recognition
Error recognition; may misdetect some more or less valid parts as errors.
Definition: avcodec.h:2971
GLsizei GLboolean const GLfloat * value
Definition: opengl_enc.c:109
const uint32_t *const ff_tta_shift_16
Definition: ttadata.c:36
int32_t
uint32_t av_crc(const AVCRC *ctx, uint32_t crc, const uint8_t *buffer, size_t length)
Calculate the CRC of a block.
Definition: crc.c:357
void(* filter_process)(int32_t *qm, int32_t *dx, int32_t *dl, int32_t *error, int32_t *in, int32_t shift, int32_t round)
Definition: ttadsp.h:25
#define AV_EF_EXPLODE
abort decoding on minor error detection
Definition: avcodec.h:2982
#define AV_CH_LAYOUT_5POINT1_BACK
uint32_t k1
Definition: ttadata.h:35
Libavcodec external API header.
AVCodecContext * avctx
Definition: tta.c:50
static const AVClass tta_decoder_class
Definition: tta.c:417
int sample_rate
samples per second
Definition: avcodec.h:2444
const uint8_t ff_tta_filter_configs[]
Definition: ttadata.c:38
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
Definition: get_bits.h:441
int ff_thread_get_buffer(AVCodecContext *avctx, ThreadFrame *f, int flags)
Wrapper around get_buffer() for frame-multithreaded codecs.
main external API structure.
Definition: avcodec.h:1682
int32_t dx[MAX_ORDER]
Definition: ttadata.h:30
void * buf
Definition: avisynth_c.h:690
int extradata_size
Definition: avcodec.h:1798
Describe the class of an AVClass context structure.
Definition: log.h:67
#define DEC
Definition: tta.c:411
#define AV_EF_CRCCHECK
Verify checksums embedded in the bitstream (could be of either encoded or decoded data...
Definition: avcodec.h:2979
uint8_t * pass
Definition: tta.c:60
int frame_length
Definition: tta.c:55
static unsigned int get_bits_long(GetBitContext *s, int n)
Read 0-32 bits.
Definition: get_bits.h:332
int last_frame_length
Definition: tta.c:55
#define MIN_CACHE_BITS
Definition: get_bits.h:112
static av_const int sign_extend(int val, unsigned bits)
Definition: mathops.h:139
#define AV_CH_BACK_CENTER
#define AV_CH_LAYOUT_7POINT1_WIDE
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:204
const AVCRC * av_crc_get_table(AVCRCId crc_id)
Get an initialized standard CRC table.
Definition: crc.c:343
uint32_t k0
Definition: ttadata.h:35
#define PRED(x, k)
int channels
Definition: tta.c:53
common internal api header.
static int get_unary(GetBitContext *gb, int stop, int len)
Get unary code of limited length.
Definition: unary.h:33
signed 16 bits
Definition: samplefmt.h:61
int32_t * decode_buffer
Definition: tta.c:57
void * priv_data
Definition: avcodec.h:1724
TTAFilter filter
Definition: ttadata.h:40
int channels
number of audio channels
Definition: avcodec.h:2445
int32_t dl[MAX_ORDER]
Definition: ttadata.h:31
#define FORMAT_ENCRYPTED
Definition: tta.c:46
static const uint8_t * align_get_bits(GetBitContext *s)
Definition: get_bits.h:449
#define av_freep(p)
static int decode(AVCodecContext *avctx, AVFrame *frame, int *got_frame, AVPacket *pkt)
Definition: ffmpeg.c:2045
#define av_malloc_array(a, b)
TTARice rice
Definition: ttadata.h:41
void ff_tta_filter_init(TTAFilter *c, int32_t shift)
Definition: ttadata.c:48
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87
This structure stores compressed data.
Definition: avcodec.h:1584
int nb_samples
number of audio samples (per channel) described by this frame
Definition: frame.h:247
uint32_t AVCRC
Definition: crc.h:47
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:959
for(j=16;j >0;--j)
uint32_t sum0
Definition: ttadata.h:35