FFmpeg
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 
33 #include "libavutil/crc.h"
34 #include "libavutil/intreadwrite.h"
35 #include "libavutil/mem.h"
36 #include "libavutil/opt.h"
37 
38 #define BITSTREAM_READER_LE
39 #include "ttadata.h"
40 #include "ttadsp.h"
41 #include "avcodec.h"
42 #include "codec_internal.h"
43 #include "get_bits.h"
44 #include "thread.h"
45 #include "unary.h"
46 
47 #define FORMAT_SIMPLE 1
48 #define FORMAT_ENCRYPTED 2
49 
50 typedef struct TTAContext {
51  AVClass *class;
53  const AVCRC *crc_table;
54 
56  unsigned data_length;
58 
60 
61  uint8_t crc_pass[8];
62  uint8_t *pass;
65 } TTAContext;
66 
67 static const int64_t tta_channel_layouts[7] = {
71  0,
75 };
76 
77 static int tta_check_crc(TTAContext *s, const uint8_t *buf, int buf_size)
78 {
79  uint32_t crc, CRC;
80 
81  CRC = AV_RL32(buf + buf_size);
82  crc = av_crc(s->crc_table, 0xFFFFFFFFU, buf, buf_size);
83  if (CRC != (crc ^ 0xFFFFFFFFU)) {
84  av_log(s->avctx, AV_LOG_ERROR, "CRC error\n");
85  return AVERROR_INVALIDDATA;
86  }
87 
88  return 0;
89 }
90 
91 static uint64_t tta_check_crc64(uint8_t *pass)
92 {
93  uint64_t crc = UINT64_MAX, poly = 0x42F0E1EBA9EA3693U;
94  uint8_t *end = pass + strlen(pass);
95  int i;
96 
97  while (pass < end) {
98  crc ^= (uint64_t)*pass++ << 56;
99  for (i = 0; i < 8; i++)
100  crc = (crc << 1) ^ (poly & (((int64_t) crc) >> 63));
101  }
102 
103  return crc ^ UINT64_MAX;
104 }
105 
107 {
108  TTAContext *s = avctx->priv_data;
109 
110  if (s->bps < 3) {
111  s->decode_buffer = av_calloc(s->frame_length,
112  sizeof(*s->decode_buffer) * s->channels);
113  if (!s->decode_buffer)
114  return AVERROR(ENOMEM);
115  } else
116  s->decode_buffer = NULL;
117  s->ch_ctx = av_malloc_array(avctx->ch_layout.nb_channels, sizeof(*s->ch_ctx));
118  if (!s->ch_ctx)
119  return AVERROR(ENOMEM);
120 
121  return 0;
122 }
123 
125 {
126  TTAContext *s = avctx->priv_data;
127  GetBitContext gb;
128  int total_frames;
129  int ret;
130 
131  s->avctx = avctx;
132 
133  // 22 bytes for a TTA1 header
134  if (avctx->extradata_size < 22)
135  return AVERROR_INVALIDDATA;
136 
137  s->crc_table = av_crc_get_table(AV_CRC_32_IEEE_LE);
138  ret = init_get_bits8(&gb, avctx->extradata, avctx->extradata_size);
139  if (ret < 0)
140  return ret;
141 
142  if (show_bits_long(&gb, 32) == AV_RL32("TTA1")) {
143  /* signature */
144  skip_bits_long(&gb, 32);
145 
146  s->format = get_bits(&gb, 16);
147  if (s->format > 2) {
148  av_log(avctx, AV_LOG_ERROR, "Invalid format\n");
149  return AVERROR_INVALIDDATA;
150  }
151  if (s->format == FORMAT_ENCRYPTED) {
152  if (!s->pass) {
153  av_log(avctx, AV_LOG_ERROR, "Missing password for encrypted stream. Please use the -password option\n");
154  return AVERROR(EINVAL);
155  }
156  AV_WL64(s->crc_pass, tta_check_crc64(s->pass));
157  }
158 
159  s->channels = get_bits(&gb, 16);
160 
162  if (s->channels > 1 && s->channels < 9) {
164  }
165  if (avctx->ch_layout.nb_channels == 0) {
167  avctx->ch_layout.nb_channels = s->channels;
168  }
169 
170  avctx->bits_per_raw_sample = get_bits(&gb, 16);
171  s->bps = (avctx->bits_per_raw_sample + 7) / 8;
172  avctx->sample_rate = get_bits_long(&gb, 32);
173  s->data_length = get_bits_long(&gb, 32);
174  skip_bits_long(&gb, 32); // CRC32 of header
175 
176  if (s->channels == 0 || s->channels > 16) {
177  av_log(avctx, AV_LOG_ERROR, "Invalid number of channels\n");
178  return AVERROR_INVALIDDATA;
179  } else if (avctx->sample_rate == 0) {
180  av_log(avctx, AV_LOG_ERROR, "Invalid samplerate\n");
181  return AVERROR_INVALIDDATA;
182  }
183 
184  switch(s->bps) {
185  case 1: avctx->sample_fmt = AV_SAMPLE_FMT_U8; break;
186  case 2:
187  avctx->sample_fmt = AV_SAMPLE_FMT_S16;
188  break;
189  case 3:
190  avctx->sample_fmt = AV_SAMPLE_FMT_S32;
191  break;
192  //case 4: avctx->sample_fmt = AV_SAMPLE_FMT_S32; break;
193  default:
194  av_log(avctx, AV_LOG_ERROR, "Invalid/unsupported sample format.\n");
195  return AVERROR_INVALIDDATA;
196  }
197 
198  // prevent overflow
199  if (avctx->sample_rate > 0x7FFFFFu) {
200  av_log(avctx, AV_LOG_ERROR, "sample_rate too large\n");
201  return AVERROR(EINVAL);
202  }
203  s->frame_length = 256 * avctx->sample_rate / 245;
204 
205  s->last_frame_length = s->data_length % s->frame_length;
206  total_frames = s->data_length / s->frame_length +
207  (s->last_frame_length ? 1 : 0);
208 
209  av_log(avctx, AV_LOG_DEBUG, "format: %d chans: %d bps: %d rate: %d block: %d\n",
210  s->format, avctx->ch_layout.nb_channels, avctx->bits_per_coded_sample, avctx->sample_rate,
211  avctx->block_align);
212  av_log(avctx, AV_LOG_DEBUG, "data_length: %d frame_length: %d last: %d total: %d\n",
213  s->data_length, s->frame_length, s->last_frame_length, total_frames);
214 
215  if (s->frame_length >= UINT_MAX / (s->channels * sizeof(int32_t))) {
216  av_log(avctx, AV_LOG_ERROR, "frame_length too large\n");
217  return AVERROR_INVALIDDATA;
218  }
219  } else {
220  av_log(avctx, AV_LOG_ERROR, "Wrong extradata present\n");
221  return AVERROR_INVALIDDATA;
222  }
223 
224  ff_ttadsp_init(&s->dsp);
225 
226  return allocate_buffers(avctx);
227 }
228 
230  int *got_frame_ptr, AVPacket *avpkt)
231 {
232  const uint8_t *buf = avpkt->data;
233  int buf_size = avpkt->size;
234  TTAContext *s = avctx->priv_data;
235  GetBitContext gb;
236  int i, ret;
237  int cur_chan = 0, framelen = s->frame_length;
238  uint32_t *p;
239 
240  if (avctx->err_recognition & AV_EF_CRCCHECK) {
241  if (buf_size < 4 ||
242  (tta_check_crc(s, buf, buf_size - 4) && avctx->err_recognition & AV_EF_EXPLODE))
243  return AVERROR_INVALIDDATA;
244  }
245 
246  if ((ret = init_get_bits8(&gb, avpkt->data, avpkt->size)) < 0)
247  return ret;
248 
249  /* get output buffer */
250  frame->nb_samples = framelen;
251  if ((ret = ff_thread_get_buffer(avctx, frame, 0)) < 0)
252  return ret;
253 
254  // decode directly to output buffer for 24-bit sample format
255  if (s->bps == 3)
256  s->decode_buffer = (int32_t *)frame->data[0];
257 
258  // init per channel states
259  for (i = 0; i < s->channels; i++) {
260  TTAFilter *filter = &s->ch_ctx[i].filter;
261  s->ch_ctx[i].predictor = 0;
263  if (s->format == FORMAT_ENCRYPTED) {
264  int i;
265  for (i = 0; i < 8; i++)
266  filter->qm[i] = sign_extend(s->crc_pass[i], 8);
267  }
268  ff_tta_rice_init(&s->ch_ctx[i].rice, 10, 10);
269  }
270 
271  i = 0;
272  for (p = s->decode_buffer; (int32_t*)p < s->decode_buffer + (framelen * s->channels); p++) {
273  int32_t *predictor = &s->ch_ctx[cur_chan].predictor;
274  TTAFilter *filter = &s->ch_ctx[cur_chan].filter;
275  TTARice *rice = &s->ch_ctx[cur_chan].rice;
276  uint32_t unary, depth, k;
277  int32_t value;
278 
279  unary = get_unary(&gb, 0, get_bits_left(&gb));
280 
281  if (unary == 0) {
282  depth = 0;
283  k = rice->k0;
284  } else {
285  depth = 1;
286  k = rice->k1;
287  unary--;
288  }
289 
290  if (get_bits_left(&gb) < k) {
292  goto error;
293  }
294 
295  if (k) {
296  if (k > MIN_CACHE_BITS || unary > INT32_MAX >> k) {
298  goto error;
299  }
300  value = (unary << k) + get_bits(&gb, k);
301  } else
302  value = unary;
303 
304  // FIXME: copy paste from original
305  switch (depth) {
306  case 1:
307  rice->sum1 += value - (rice->sum1 >> 4);
308  if (rice->k1 > 0 && rice->sum1 < ff_tta_shift_16[rice->k1])
309  rice->k1--;
310  else if (rice->sum1 > ff_tta_shift_16[rice->k1 + 1])
311  rice->k1++;
312  value += ff_tta_shift_1[rice->k0];
313  default:
314  rice->sum0 += value - (rice->sum0 >> 4);
315  if (rice->k0 > 0 && rice->sum0 < ff_tta_shift_16[rice->k0])
316  rice->k0--;
317  else if (rice->sum0 > ff_tta_shift_16[rice->k0 + 1])
318  rice->k0++;
319  }
320 
321  // extract coded value
322  *p = 1 + ((value >> 1) ^ ((value & 1) - 1));
323 
324  // run hybrid filter
325  s->dsp.filter_process(filter->qm, filter->dx, filter->dl, &filter->error, p,
326  filter->shift, filter->round);
327 
328  // fixed order prediction
329 #define PRED(x, k) (int32_t)((((uint64_t)(x) << (k)) - (x)) >> (k))
330  switch (s->bps) {
331  case 1: *p += PRED(*predictor, 4); break;
332  case 2:
333  case 3: *p += PRED(*predictor, 5); break;
334  case 4: *p += *predictor; break;
335  }
336  *predictor = *p;
337 
338  // flip channels
339  if (cur_chan < (s->channels-1))
340  cur_chan++;
341  else {
342  // decorrelate in case of multiple channels
343  if (s->channels > 1) {
344  int32_t *r = p - 1;
345  for (*p += *r / 2; r > (int32_t*)p - s->channels; r--)
346  *r = *(r + 1) - (unsigned)*r;
347  }
348  cur_chan = 0;
349  i++;
350  // check for last frame
351  if (i == s->last_frame_length && get_bits_left(&gb) / 8 == 4) {
352  frame->nb_samples = framelen = s->last_frame_length;
353  break;
354  }
355  }
356  }
357 
358  align_get_bits(&gb);
359  if (get_bits_left(&gb) < 32) {
361  goto error;
362  }
363  skip_bits_long(&gb, 32); // frame crc
364 
365  // convert to output buffer
366  switch (s->bps) {
367  case 1: {
368  uint8_t *samples = (uint8_t *)frame->data[0];
369  p = s->decode_buffer;
370  for (i = 0; i < framelen * s->channels; i++)
371  samples[i] = p[i] + 0x80;
372  break;
373  }
374  case 2: {
375  int16_t *samples = (int16_t *)frame->data[0];
376  p = s->decode_buffer;
377  for (i = 0; i < framelen * s->channels; i++)
378  samples[i] = p[i];
379  break;
380  }
381  case 3: {
382  // shift samples for 24-bit sample format
383  int32_t *samples = (int32_t *)frame->data[0];
384 
385  for (i = 0; i < framelen * s->channels; i++)
386  samples[i] = samples[i] * 256U;
387  // reset decode buffer
388  s->decode_buffer = NULL;
389  break;
390  }
391  }
392 
393  *got_frame_ptr = 1;
394 
395  return buf_size;
396 error:
397  // reset decode buffer
398  if (s->bps == 3)
399  s->decode_buffer = NULL;
400  return ret;
401 }
402 
404 {
405  TTAContext *s = avctx->priv_data;
406 
407  if (s->bps < 3)
408  av_freep(&s->decode_buffer);
409  s->decode_buffer = NULL;
410  av_freep(&s->ch_ctx);
411 
412  return 0;
413 }
414 
415 #define OFFSET(x) offsetof(TTAContext, x)
416 #define DEC (AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM)
417 static const AVOption options[] = {
418  { "password", "Set decoding password", OFFSET(pass), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, DEC },
419  { NULL },
420 };
421 
422 static const AVClass tta_decoder_class = {
423  .class_name = "TTA Decoder",
424  .item_name = av_default_item_name,
425  .option = options,
426  .version = LIBAVUTIL_VERSION_INT,
427 };
428 
430  .p.name = "tta",
431  CODEC_LONG_NAME("TTA (True Audio)"),
432  .p.type = AVMEDIA_TYPE_AUDIO,
433  .p.id = AV_CODEC_ID_TTA,
434  .priv_data_size = sizeof(TTAContext),
436  .close = tta_decode_close,
439  .p.priv_class = &tta_decoder_class,
440  .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
441 };
error
static void error(const char *err)
Definition: target_bsf_fuzzer.c:32
tta_check_crc
static int tta_check_crc(TTAContext *s, const uint8_t *buf, int buf_size)
Definition: tta.c:77
skip_bits_long
static void skip_bits_long(GetBitContext *s, int n)
Skips the specified number of bits.
Definition: get_bits.h:278
AV_EF_EXPLODE
#define AV_EF_EXPLODE
abort decoding on minor error detection
Definition: defs.h:51
FF_CODEC_CAP_INIT_CLEANUP
#define FF_CODEC_CAP_INIT_CLEANUP
The codec allows calling the close function for deallocation even if the init function returned a fai...
Definition: codec_internal.h:42
show_bits_long
static unsigned int show_bits_long(GetBitContext *s, int n)
Show 0-32 bits.
Definition: get_bits.h:495
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static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:695
PRED
#define PRED(x, k)
r
const char * r
Definition: vf_curves.c:127
AVERROR
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
opt.h
AVCodecContext::sample_rate
int sample_rate
samples per second
Definition: avcodec.h:1050
AVCRC
uint32_t AVCRC
Definition: crc.h:46
tta_check_crc64
static uint64_t tta_check_crc64(uint8_t *pass)
Definition: tta.c:91
AVCodecContext::err_recognition
int err_recognition
Error recognition; may misdetect some more or less valid parts as errors.
Definition: avcodec.h:1420
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static unsigned int get_bits_long(GetBitContext *s, int n)
Read 0-32 bits.
Definition: get_bits.h:421
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void ff_tta_filter_init(TTAFilter *c, int32_t shift)
Definition: ttadata.c:50
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:374
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uint8_t * data
Definition: packet.h:524
AVOption
AVOption.
Definition: opt.h:357
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Definition: tta.c:50
FFCodec
Definition: codec_internal.h:126
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void(* filter)(uint8_t *src, int stride, int qscale)
Definition: h263dsp.c:29
AVChannelLayout::order
enum AVChannelOrder order
Channel order used in this layout.
Definition: channel_layout.h:308
ff_tta_rice_init
void ff_tta_rice_init(TTARice *c, uint32_t k0, uint32_t k1)
Definition: ttadata.c:42
AVChannelLayout::nb_channels
int nb_channels
Number of channels in this layout.
Definition: channel_layout.h:313
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uint32_t k1
Definition: ttadata.h:35
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static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:335
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AVCodec p
The public AVCodec.
Definition: codec_internal.h:130
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AVChannelLayout ch_layout
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Definition: avcodec.h:1065
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static const AVClass tta_decoder_class
Definition: tta.c:422
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Definition: get_bits.h:108
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#define FORMAT_ENCRYPTED
Definition: tta.c:48
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Definition: ttadata.h:35
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#define AV_CH_LAYOUT_STEREO
Definition: channel_layout.h:205
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int channels
Definition: tta.c:55
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av_cold void ff_ttadsp_init(TTADSPContext *c)
Definition: ttadsp.c:56
AV_CH_LAYOUT_QUAD
#define AV_CH_LAYOUT_QUAD
Definition: channel_layout.h:213
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TTADSPContext dsp
Definition: tta.c:64
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
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#define av_cold
Definition: attributes.h:90
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static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
Definition: get_bits.h:545
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@ AV_CODEC_ID_TTA
Definition: codec_id.h:462
AV_CH_LOW_FREQUENCY
#define AV_CH_LOW_FREQUENCY
Definition: channel_layout.h:171
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int extradata_size
Definition: avcodec.h:524
FF_CODEC_DECODE_CB
#define FF_CODEC_DECODE_CB(func)
Definition: codec_internal.h:286
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static av_cold int tta_decode_init(AVCodecContext *avctx)
Definition: tta.c:124
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s
#define s(width, name)
Definition: cbs_vp9.c:198
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@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
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static const int64_t tta_channel_layouts[7]
Definition: tta.c:67
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@ AV_CHANNEL_ORDER_UNSPEC
Only the channel count is specified, without any further information about the channel order.
Definition: channel_layout.h:112
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int ff_thread_get_buffer(AVCodecContext *avctx, AVFrame *f, int flags)
Wrapper around get_buffer() for frame-multithreaded codecs.
Definition: pthread_frame.c:986
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int av_channel_layout_from_mask(AVChannelLayout *channel_layout, uint64_t mask)
Initialize a native channel layout from a bitmask indicating which channels are present.
Definition: channel_layout.c:243
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static int allocate_buffers(AVCodecContext *avctx)
Definition: tta.c:106
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int bits_per_raw_sample
Bits per sample/pixel of internal libavcodec pixel/sample format.
Definition: avcodec.h:1575
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#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:201
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uint8_t crc_pass[8]
Definition: tta.c:61
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Definition: tta.c:53
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#define CODEC_LONG_NAME(str)
Definition: codec_internal.h:271
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Definition: ttadata.h:35
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#define AV_CODEC_CAP_FRAME_THREADS
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Definition: codec.h:110
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int bps
Definition: tta.c:55
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#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
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Definition: log.h:66
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#define NULL
Definition: coverity.c:32
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Return the context name.
Definition: log.c:237
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Definition: ttadata.h:27
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Definition: ttadsp.h:24
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const FFCodec ff_tta_decoder
Definition: tta.c:429
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#define DEC
Definition: tta.c:416
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#define AV_EF_CRCCHECK
Verify checksums embedded in the bitstream (could be of either encoded or decoded data,...
Definition: defs.h:48
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static int get_unary(GetBitContext *gb, int stop, int len)
Get unary code of limited length.
Definition: unary.h:46
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int32_t * decode_buffer
Definition: tta.c:59
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AVCodecContext * avctx
Definition: tta.c:52
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#define AV_CODEC_CAP_CHANNEL_CONF
Codec should fill in channel configuration and samplerate instead of container.
Definition: codec.h:106
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int last_frame_length
Definition: tta.c:57
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Definition: dts2pts.c:366
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#define AV_CODEC_CAP_DR1
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Definition: codec.h:52
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Definition: packet.h:525
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Definition: h264pred_template.c:425
AVCodecContext::sample_fmt
enum AVSampleFormat sample_fmt
audio sample format
Definition: avcodec.h:1057
TTAContext::data_length
unsigned data_length
Definition: tta.c:56
TTAContext::format
int format
Definition: tta.c:55
AV_WL64
#define AV_WL64(p, v)
Definition: intreadwrite.h:438
av_crc_get_table
const AVCRC * av_crc_get_table(AVCRCId crc_id)
Get an initialized standard CRC table.
Definition: crc.c:374
AV_CH_LAYOUT_5POINT1_BACK
#define AV_CH_LAYOUT_5POINT1_BACK
Definition: channel_layout.h:217
TTAContext::pass
uint8_t * pass
Definition: tta.c:62
predictor
static void predictor(uint8_t *src, ptrdiff_t size)
Definition: exrenc.c:169
unary.h
ff_tta_shift_1
const uint32_t ff_tta_shift_1[]
Definition: ttadata.c:24
tta_decode_frame
static int tta_decode_frame(AVCodecContext *avctx, AVFrame *frame, int *got_frame_ptr, AVPacket *avpkt)
Definition: tta.c:229
AVCodecContext::bits_per_coded_sample
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:1568
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:256
AVCodecContext::extradata
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:523
AV_SAMPLE_FMT_U8
@ AV_SAMPLE_FMT_U8
unsigned 8 bits
Definition: samplefmt.h:57
ff_tta_shift_16
const uint32_t *const ff_tta_shift_16
Definition: ttadata.c:38
ff_tta_filter_configs
const uint8_t ff_tta_filter_configs[]
Definition: ttadata.c:40
av_malloc_array
#define av_malloc_array(a, b)
Definition: tableprint_vlc.h:31
MIN_CACHE_BITS
#define MIN_CACHE_BITS
Definition: get_bits.h:169
ttadata.h
AV_CH_BACK_CENTER
#define AV_CH_BACK_CENTER
Definition: channel_layout.h:176
value
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 default value
Definition: writing_filters.txt:86
AV_CH_LAYOUT_7POINT1_WIDE
#define AV_CH_LAYOUT_7POINT1_WIDE
Definition: channel_layout.h:228
AV_SAMPLE_FMT_S16
@ AV_SAMPLE_FMT_S16
signed 16 bits
Definition: samplefmt.h:58
TTAChannel
Definition: ttadata.h:38
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:194
av_calloc
void * av_calloc(size_t nmemb, size_t size)
Definition: mem.c:264
avcodec.h
TTARice::k0
uint32_t k0
Definition: ttadata.h:35
ret
ret
Definition: filter_design.txt:187
AVCodecContext::block_align
int block_align
number of bytes per packet if constant and known or 0 Used by some WAV based audio codecs.
Definition: avcodec.h:1083
AVClass::class_name
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:71
frame
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame For filters that do not use the this method is called when a frame is wanted on an output For a it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return or at least make progress towards producing a frame
Definition: filter_design.txt:264
align_get_bits
static const uint8_t * align_get_bits(GetBitContext *s)
Definition: get_bits.h:561
TTARice
Definition: ttadata.h:34
AV_RL32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:92
U
#define U(x)
Definition: vpx_arith.h:37
tta_decode_close
static av_cold int tta_decode_close(AVCodecContext *avctx)
Definition: tta.c:403
TTAContext::frame_length
int frame_length
Definition: tta.c:57
OFFSET
#define OFFSET(x)
Definition: tta.c:415
AVCodecContext
main external API structure.
Definition: avcodec.h:445
channel_layout.h
av_crc
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:392
av_channel_layout_uninit
void av_channel_layout_uninit(AVChannelLayout *channel_layout)
Free any allocated data in the channel layout and reset the channel count to 0.
Definition: channel_layout.c:433
sign_extend
static av_const int sign_extend(int val, unsigned bits)
Definition: mathops.h:133
samples
Filter the word “frame” indicates either a video frame or a group of audio samples
Definition: filter_design.txt:8
AV_CRC_32_IEEE_LE
@ AV_CRC_32_IEEE_LE
Definition: crc.h:53
TTAContext::ch_ctx
TTAChannel * ch_ctx
Definition: tta.c:63
mem.h
ttadsp.h
AVPacket
This structure stores compressed data.
Definition: packet.h:501
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:472
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:34
int32_t
int32_t
Definition: audioconvert.c:56
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
AV_OPT_TYPE_STRING
@ AV_OPT_TYPE_STRING
Definition: opt.h:249
options
static const AVOption options[]
Definition: tta.c:417
AV_SAMPLE_FMT_S32
@ AV_SAMPLE_FMT_S32
signed 32 bits
Definition: samplefmt.h:59