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 
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 
59  uint8_t crc_pass[8];
60  uint8_t *pass;
63 } TTAContext;
64 
65 static const int64_t tta_channel_layouts[7] = {
69  0,
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) {
109  s->decode_buffer = av_mallocz_array(sizeof(int32_t)*s->frame_length, s->channels);
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  // 22 bytes for a TTA1 header
133  if (avctx->extradata_size < 22)
134  return AVERROR_INVALIDDATA;
135 
136  s->crc_table = av_crc_get_table(AV_CRC_32_IEEE_LE);
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  }
155  AV_WL64(s->crc_pass, tta_check_crc64(s->pass));
156  }
157  avctx->channels = s->channels = get_bits(&gb, 16);
158  if (s->channels > 1 && s->channels < 9)
159  avctx->channel_layout = tta_channel_layouts[s->channels-2];
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 || s->channels > 16) {
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 
195  s->last_frame_length = s->data_length % s->frame_length;
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  uint32_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; (int32_t*)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) {
284  goto error;
285  }
286 
287  if (k) {
288  if (k > MIN_CACHE_BITS || unary > INT32_MAX >> k) {
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 > (int32_t*)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) {
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; (int32_t*)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; (int32_t*)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++ *= 256;
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  TTAContext *s = avctx->priv_data;
394 
395  if (s->bps < 3)
396  av_freep(&s->decode_buffer);
397  s->decode_buffer = NULL;
398  av_freep(&s->ch_ctx);
399 
400  return 0;
401 }
402 
403 #define OFFSET(x) offsetof(TTAContext, x)
404 #define DEC (AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM)
405 static const AVOption options[] = {
406  { "password", "Set decoding password", OFFSET(pass), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, DEC },
407  { NULL },
408 };
409 
410 static const AVClass tta_decoder_class = {
411  .class_name = "TTA Decoder",
412  .item_name = av_default_item_name,
413  .option = options,
414  .version = LIBAVUTIL_VERSION_INT,
415 };
416 
418  .name = "tta",
419  .long_name = NULL_IF_CONFIG_SMALL("TTA (True Audio)"),
420  .type = AVMEDIA_TYPE_AUDIO,
421  .id = AV_CODEC_ID_TTA,
422  .priv_data_size = sizeof(TTAContext),
424  .close = tta_decode_close,
427  .priv_class = &tta_decoder_class,
428  .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
429 };
error
static void error(const char *err)
Definition: target_bsf_fuzzer.c:30
AVCodec
AVCodec.
Definition: codec.h:197
tta_check_crc
static int tta_check_crc(TTAContext *s, const uint8_t *buf, int buf_size)
Definition: tta.c:75
skip_bits_long
static void skip_bits_long(GetBitContext *s, int n)
Skips the specified number of bits.
Definition: get_bits.h:292
FF_CODEC_CAP_INIT_THREADSAFE
#define FF_CODEC_CAP_INIT_THREADSAFE
The codec does not modify any global variables in the init function, allowing to call the init functi...
Definition: internal.h:41
init
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:31
show_bits_long
static unsigned int show_bits_long(GetBitContext *s, int n)
Show 0-32 bits.
Definition: get_bits.h:603
get_bits_left
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:850
PRED
#define PRED(x, k)
r
const char * r
Definition: vf_curves.c:116
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::channel_layout
uint64_t channel_layout
Audio channel layout.
Definition: avcodec.h:1032
AVCodecContext::sample_rate
int sample_rate
samples per second
Definition: avcodec.h:981
AVCRC
uint32_t AVCRC
Definition: crc.h:47
tta_check_crc64
static uint64_t tta_check_crc64(uint8_t *pass)
Definition: tta.c:89
AVCodecContext::err_recognition
int err_recognition
Error recognition; may misdetect some more or less valid parts as errors.
Definition: avcodec.h:1313
get_bits_long
static unsigned int get_bits_long(GetBitContext *s, int n)
Read 0-32 bits.
Definition: get_bits.h:547
ff_tta_filter_init
void ff_tta_filter_init(TTAFilter *c, int32_t shift)
Definition: ttadata.c:49
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:303
internal.h
AVPacket::data
uint8_t * data
Definition: packet.h:365
AVOption
AVOption.
Definition: opt.h:248
TTAContext
Definition: tta.c:48
data
const char data[16]
Definition: mxf.c:142
av_mallocz_array
void * av_mallocz_array(size_t nmemb, size_t size)
Definition: mem.c:197
filter
filter_frame For filters that do not use the this method is called when a frame is pushed to the filter s input It can be called at any time except in a reentrant way If the input frame is enough to produce then the filter should push the output frames on the output link immediately As an exception to the previous rule if the input frame is enough to produce several output frames then the filter needs output only at least one per link The additional frames can be left buffered in the filter
Definition: filter_design.txt:228
ff_tta_rice_init
void ff_tta_rice_init(TTARice *c, uint32_t k0, uint32_t k1)
Definition: ttadata.c:41
thread.h
ThreadFrame::f
AVFrame * f
Definition: thread.h:35
TTARice::k1
uint32_t k1
Definition: ttadata.h:35
crc.h
get_bits
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:380
U
#define U(x)
Definition: vp56_arith.h:37
tta_decoder_class
static const AVClass tta_decoder_class
Definition: tta.c:410
GetBitContext
Definition: get_bits.h:62
ff_thread_get_buffer
the pkt_dts and pkt_pts fields in AVFrame will work as usual Restrictions on codec whose streams don t reset across will not work because their bitstreams cannot be decoded in parallel *The contents of buffers must not be read before as well as code calling up to before the decode process starts Call have so the codec calls ff_thread_report set FF_CODEC_CAP_ALLOCATE_PROGRESS in AVCodec caps_internal and use ff_thread_get_buffer() to allocate frames. The frames must then be freed with ff_thread_release_buffer(). Otherwise decode directly into the user-supplied frames. Call ff_thread_report_progress() after some part of the current picture has decoded. A good place to put this is where draw_horiz_band() is called - add this if it isn 't called anywhere
FORMAT_ENCRYPTED
#define FORMAT_ENCRYPTED
Definition: tta.c:46
TTARice::sum1
uint32_t sum1
Definition: ttadata.h:35
AV_CH_LAYOUT_STEREO
#define AV_CH_LAYOUT_STEREO
Definition: channel_layout.h:91
TTAContext::channels
int channels
Definition: tta.c:53
ff_ttadsp_init
av_cold void ff_ttadsp_init(TTADSPContext *c)
Definition: ttadsp.c:55
AV_CH_LAYOUT_QUAD
#define AV_CH_LAYOUT_QUAD
Definition: channel_layout.h:99
TTAContext::dsp
TTADSPContext dsp
Definition: tta.c:62
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:181
av_cold
#define av_cold
Definition: attributes.h:90
init_get_bits8
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
Definition: get_bits.h:678
AV_CODEC_ID_TTA
@ AV_CODEC_ID_TTA
Definition: codec_id.h:444
AV_CH_LOW_FREQUENCY
#define AV_CH_LOW_FREQUENCY
Definition: channel_layout.h:52
decode
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:71
AVCodecContext::extradata_size
int extradata_size
Definition: avcodec.h:486
tta_decode_init
static av_cold int tta_decode_init(AVCodecContext *avctx)
Definition: tta.c:123
intreadwrite.h
s
#define s(width, name)
Definition: cbs_vp9.c:257
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
tta_channel_layouts
static const int64_t tta_channel_layouts[7]
Definition: tta.c:65
allocate_buffers
static int allocate_buffers(AVCodecContext *avctx)
Definition: tta.c:104
AVCodecContext::bits_per_raw_sample
int bits_per_raw_sample
Bits per sample/pixel of internal libavcodec pixel/sample format.
Definition: avcodec.h:1414
AV_LOG_DEBUG
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:202
get_bits.h
limits.h
TTAContext::crc_pass
uint8_t crc_pass[8]
Definition: tta.c:59
pass
#define pass
Definition: fft_template.c:603
TTAContext::crc_table
const AVCRC * crc_table
Definition: tta.c:51
TTARice::sum0
uint32_t sum0
Definition: ttadata.h:35
AV_CODEC_CAP_FRAME_THREADS
#define AV_CODEC_CAP_FRAME_THREADS
Codec supports frame-level multithreading.
Definition: codec.h:108
TTAContext::bps
int bps
Definition: tta.c:53
LIBAVUTIL_VERSION_INT
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:67
NULL
#define NULL
Definition: coverity.c:32
av_default_item_name
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:235
TTAFilter
Definition: ttadata.h:27
TTADSPContext
Definition: ttadsp.h:24
DEC
#define DEC
Definition: tta.c:404
AV_EF_EXPLODE
#define AV_EF_EXPLODE
abort decoding on minor error detection
Definition: avcodec.h:1324
get_unary
static int get_unary(GetBitContext *gb, int stop, int len)
Get unary code of limited length.
Definition: unary.h:46
for
for(j=16;j >0;--j)
Definition: h264pred_template.c:469
TTAContext::decode_buffer
int32_t * decode_buffer
Definition: tta.c:57
TTAContext::avctx
AVCodecContext * avctx
Definition: tta.c:50
AV_CODEC_CAP_CHANNEL_CONF
#define AV_CODEC_CAP_CHANNEL_CONF
Codec should fill in channel configuration and samplerate instead of container.
Definition: codec.h:104
TTAContext::last_frame_length
int last_frame_length
Definition: tta.c:55
AV_CODEC_CAP_DR1
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:52
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int size
Definition: packet.h:366
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
AVCodecContext::sample_fmt
enum AVSampleFormat sample_fmt
audio sample format
Definition: avcodec.h:989
TTAContext::data_length
unsigned data_length
Definition: tta.c:54
TTAContext::format
int format
Definition: tta.c:53
AV_WL64
#define AV_WL64(p, v)
Definition: intreadwrite.h:440
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:103
TTAContext::pass
uint8_t * pass
Definition: tta.c:60
predictor
static void predictor(uint8_t *src, ptrdiff_t size)
Definition: exrenc.c:164
unary.h
ff_tta_shift_1
const uint32_t ff_tta_shift_1[]
Definition: ttadata.c:23
AVCodecContext::channels
int channels
number of audio channels
Definition: avcodec.h:982
AVCodecContext::bits_per_coded_sample
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:1407
i
int i
Definition: input.c:407
AVCodecContext::extradata
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:485
AV_SAMPLE_FMT_U8
@ AV_SAMPLE_FMT_U8
unsigned 8 bits
Definition: samplefmt.h:60
ff_tta_shift_16
const uint32_t *const ff_tta_shift_16
Definition: ttadata.c:37
ff_tta_filter_configs
const uint8_t ff_tta_filter_configs[]
Definition: ttadata.c:39
av_malloc_array
#define av_malloc_array(a, b)
Definition: tableprint_vlc.h:32
tta_decode_frame
static int tta_decode_frame(AVCodecContext *avctx, void *data, int *got_frame_ptr, AVPacket *avpkt)
Definition: tta.c:219
MIN_CACHE_BITS
#define MIN_CACHE_BITS
Definition: get_bits.h:129
ttadata.h
AV_CH_BACK_CENTER
#define AV_CH_BACK_CENTER
Definition: channel_layout.h:57
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:113
AV_SAMPLE_FMT_S16
@ AV_SAMPLE_FMT_S16
signed 16 bits
Definition: samplefmt.h:61
TTAChannel
Definition: ttadata.h:38
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:204
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:1018
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:72
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
AV_EF_CRCCHECK
#define AV_EF_CRCCHECK
Verify checksums embedded in the bitstream (could be of either encoded or decoded data,...
Definition: avcodec.h:1321
align_get_bits
static const uint8_t * align_get_bits(GetBitContext *s)
Definition: get_bits.h:694
TTARice
Definition: ttadata.h:34
AV_RL32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:92
tta_decode_close
static av_cold int tta_decode_close(AVCodecContext *avctx)
Definition: tta.c:392
TTAContext::frame_length
int frame_length
Definition: tta.c:55
OFFSET
#define OFFSET(x)
Definition: tta.c:403
AVCodecContext
main external API structure.
Definition: avcodec.h:384
ThreadFrame
Definition: thread.h:34
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
sign_extend
static av_const int sign_extend(int val, unsigned bits)
Definition: mathops.h:130
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:54
TTAContext::ch_ctx
TTAChannel * ch_ctx
Definition: tta.c:61
ttadsp.h
AVPacket
This structure stores compressed data.
Definition: packet.h:342
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:411
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:35
ff_tta_decoder
const AVCodec ff_tta_decoder
Definition: tta.c:417
int32_t
int32_t
Definition: audioconvert.c:56
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
AV_OPT_TYPE_STRING
@ AV_OPT_TYPE_STRING
Definition: opt.h:229
options
static const AVOption options[]
Definition: tta.c:405
AV_SAMPLE_FMT_S32
@ AV_SAMPLE_FMT_S32
signed 32 bits
Definition: samplefmt.h:62