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/opt.h"
36 
37 #define BITSTREAM_READER_LE
38 #include "ttadata.h"
39 #include "ttadsp.h"
40 #include "avcodec.h"
41 #include "codec_internal.h"
42 #include "get_bits.h"
43 #include "thread.h"
44 #include "unary.h"
45 
46 #define FORMAT_SIMPLE 1
47 #define FORMAT_ENCRYPTED 2
48 
49 typedef struct TTAContext {
50  AVClass *class;
52  const AVCRC *crc_table;
53 
55  unsigned data_length;
57 
59 
60  uint8_t crc_pass[8];
61  uint8_t *pass;
64 } TTAContext;
65 
66 static const int64_t tta_channel_layouts[7] = {
70  0,
74 };
75 
76 static int tta_check_crc(TTAContext *s, const uint8_t *buf, int buf_size)
77 {
78  uint32_t crc, CRC;
79 
80  CRC = AV_RL32(buf + buf_size);
81  crc = av_crc(s->crc_table, 0xFFFFFFFFU, buf, buf_size);
82  if (CRC != (crc ^ 0xFFFFFFFFU)) {
83  av_log(s->avctx, AV_LOG_ERROR, "CRC error\n");
84  return AVERROR_INVALIDDATA;
85  }
86 
87  return 0;
88 }
89 
90 static uint64_t tta_check_crc64(uint8_t *pass)
91 {
92  uint64_t crc = UINT64_MAX, poly = 0x42F0E1EBA9EA3693U;
93  uint8_t *end = pass + strlen(pass);
94  int i;
95 
96  while (pass < end) {
97  crc ^= (uint64_t)*pass++ << 56;
98  for (i = 0; i < 8; i++)
99  crc = (crc << 1) ^ (poly & (((int64_t) crc) >> 63));
100  }
101 
102  return crc ^ UINT64_MAX;
103 }
104 
106 {
107  TTAContext *s = avctx->priv_data;
108 
109  if (s->bps < 3) {
110  s->decode_buffer = av_calloc(s->frame_length,
111  sizeof(*s->decode_buffer) * s->channels);
112  if (!s->decode_buffer)
113  return AVERROR(ENOMEM);
114  } else
115  s->decode_buffer = NULL;
116  s->ch_ctx = av_malloc_array(avctx->ch_layout.nb_channels, sizeof(*s->ch_ctx));
117  if (!s->ch_ctx)
118  return AVERROR(ENOMEM);
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 
158  s->channels = get_bits(&gb, 16);
159 
161  if (s->channels > 1 && s->channels < 9) {
163  } else {
165  avctx->ch_layout.nb_channels = s->channels;
166  }
167 
168  avctx->bits_per_raw_sample = get_bits(&gb, 16);
169  s->bps = (avctx->bits_per_raw_sample + 7) / 8;
170  avctx->sample_rate = get_bits_long(&gb, 32);
171  s->data_length = get_bits_long(&gb, 32);
172  skip_bits_long(&gb, 32); // CRC32 of header
173 
174  if (s->channels == 0 || s->channels > 16) {
175  av_log(avctx, AV_LOG_ERROR, "Invalid number of channels\n");
176  return AVERROR_INVALIDDATA;
177  } else if (avctx->sample_rate == 0) {
178  av_log(avctx, AV_LOG_ERROR, "Invalid samplerate\n");
179  return AVERROR_INVALIDDATA;
180  }
181 
182  switch(s->bps) {
183  case 1: avctx->sample_fmt = AV_SAMPLE_FMT_U8; break;
184  case 2:
185  avctx->sample_fmt = AV_SAMPLE_FMT_S16;
186  break;
187  case 3:
188  avctx->sample_fmt = AV_SAMPLE_FMT_S32;
189  break;
190  //case 4: avctx->sample_fmt = AV_SAMPLE_FMT_S32; break;
191  default:
192  av_log(avctx, AV_LOG_ERROR, "Invalid/unsupported sample format.\n");
193  return AVERROR_INVALIDDATA;
194  }
195 
196  // prevent overflow
197  if (avctx->sample_rate > 0x7FFFFFu) {
198  av_log(avctx, AV_LOG_ERROR, "sample_rate too large\n");
199  return AVERROR(EINVAL);
200  }
201  s->frame_length = 256 * avctx->sample_rate / 245;
202 
203  s->last_frame_length = s->data_length % s->frame_length;
204  total_frames = s->data_length / s->frame_length +
205  (s->last_frame_length ? 1 : 0);
206 
207  av_log(avctx, AV_LOG_DEBUG, "format: %d chans: %d bps: %d rate: %d block: %d\n",
208  s->format, avctx->ch_layout.nb_channels, avctx->bits_per_coded_sample, avctx->sample_rate,
209  avctx->block_align);
210  av_log(avctx, AV_LOG_DEBUG, "data_length: %d frame_length: %d last: %d total: %d\n",
211  s->data_length, s->frame_length, s->last_frame_length, total_frames);
212 
213  if(s->frame_length >= UINT_MAX / (s->channels * sizeof(int32_t))){
214  av_log(avctx, AV_LOG_ERROR, "frame_length too large\n");
215  return AVERROR_INVALIDDATA;
216  }
217  } else {
218  av_log(avctx, AV_LOG_ERROR, "Wrong extradata present\n");
219  return AVERROR_INVALIDDATA;
220  }
221 
222  ff_ttadsp_init(&s->dsp);
223 
224  return allocate_buffers(avctx);
225 }
226 
228  int *got_frame_ptr, AVPacket *avpkt)
229 {
230  const uint8_t *buf = avpkt->data;
231  int buf_size = avpkt->size;
232  TTAContext *s = avctx->priv_data;
233  GetBitContext gb;
234  int i, ret;
235  int cur_chan = 0, framelen = s->frame_length;
236  uint32_t *p;
237 
238  if (avctx->err_recognition & AV_EF_CRCCHECK) {
239  if (buf_size < 4 ||
240  (tta_check_crc(s, buf, buf_size - 4) && avctx->err_recognition & AV_EF_EXPLODE))
241  return AVERROR_INVALIDDATA;
242  }
243 
244  if ((ret = init_get_bits8(&gb, avpkt->data, avpkt->size)) < 0)
245  return ret;
246 
247  /* get output buffer */
248  frame->nb_samples = framelen;
249  if ((ret = ff_thread_get_buffer(avctx, frame, 0)) < 0)
250  return ret;
251 
252  // decode directly to output buffer for 24-bit sample format
253  if (s->bps == 3)
254  s->decode_buffer = (int32_t *)frame->data[0];
255 
256  // init per channel states
257  for (i = 0; i < s->channels; i++) {
258  TTAFilter *filter = &s->ch_ctx[i].filter;
259  s->ch_ctx[i].predictor = 0;
261  if (s->format == FORMAT_ENCRYPTED) {
262  int i;
263  for (i = 0; i < 8; i++)
264  filter->qm[i] = sign_extend(s->crc_pass[i], 8);
265  }
266  ff_tta_rice_init(&s->ch_ctx[i].rice, 10, 10);
267  }
268 
269  i = 0;
270  for (p = s->decode_buffer; (int32_t*)p < s->decode_buffer + (framelen * s->channels); p++) {
271  int32_t *predictor = &s->ch_ctx[cur_chan].predictor;
272  TTAFilter *filter = &s->ch_ctx[cur_chan].filter;
273  TTARice *rice = &s->ch_ctx[cur_chan].rice;
274  uint32_t unary, depth, k;
275  int32_t value;
276 
277  unary = get_unary(&gb, 0, get_bits_left(&gb));
278 
279  if (unary == 0) {
280  depth = 0;
281  k = rice->k0;
282  } else {
283  depth = 1;
284  k = rice->k1;
285  unary--;
286  }
287 
288  if (get_bits_left(&gb) < k) {
290  goto error;
291  }
292 
293  if (k) {
294  if (k > MIN_CACHE_BITS || unary > INT32_MAX >> k) {
296  goto error;
297  }
298  value = (unary << k) + get_bits(&gb, k);
299  } else
300  value = unary;
301 
302  // FIXME: copy paste from original
303  switch (depth) {
304  case 1:
305  rice->sum1 += value - (rice->sum1 >> 4);
306  if (rice->k1 > 0 && rice->sum1 < ff_tta_shift_16[rice->k1])
307  rice->k1--;
308  else if(rice->sum1 > ff_tta_shift_16[rice->k1 + 1])
309  rice->k1++;
310  value += ff_tta_shift_1[rice->k0];
311  default:
312  rice->sum0 += value - (rice->sum0 >> 4);
313  if (rice->k0 > 0 && rice->sum0 < ff_tta_shift_16[rice->k0])
314  rice->k0--;
315  else if(rice->sum0 > ff_tta_shift_16[rice->k0 + 1])
316  rice->k0++;
317  }
318 
319  // extract coded value
320  *p = 1 + ((value >> 1) ^ ((value & 1) - 1));
321 
322  // run hybrid filter
323  s->dsp.filter_process(filter->qm, filter->dx, filter->dl, &filter->error, p,
324  filter->shift, filter->round);
325 
326  // fixed order prediction
327 #define PRED(x, k) (int32_t)((((uint64_t)(x) << (k)) - (x)) >> (k))
328  switch (s->bps) {
329  case 1: *p += PRED(*predictor, 4); break;
330  case 2:
331  case 3: *p += PRED(*predictor, 5); break;
332  case 4: *p += *predictor; break;
333  }
334  *predictor = *p;
335 
336  // flip channels
337  if (cur_chan < (s->channels-1))
338  cur_chan++;
339  else {
340  // decorrelate in case of multiple channels
341  if (s->channels > 1) {
342  int32_t *r = p - 1;
343  for (*p += *r / 2; r > (int32_t*)p - s->channels; r--)
344  *r = *(r + 1) - *r;
345  }
346  cur_chan = 0;
347  i++;
348  // check for last frame
349  if (i == s->last_frame_length && get_bits_left(&gb) / 8 == 4) {
350  frame->nb_samples = framelen = s->last_frame_length;
351  break;
352  }
353  }
354  }
355 
356  align_get_bits(&gb);
357  if (get_bits_left(&gb) < 32) {
359  goto error;
360  }
361  skip_bits_long(&gb, 32); // frame crc
362 
363  // convert to output buffer
364  switch (s->bps) {
365  case 1: {
366  uint8_t *samples = (uint8_t *)frame->data[0];
367  p = s->decode_buffer;
368  for (i = 0; i < framelen * s->channels; i++)
369  samples[i] = p[i] + 0x80;
370  break;
371  }
372  case 2: {
373  int16_t *samples = (int16_t *)frame->data[0];
374  p = s->decode_buffer;
375  for (i = 0; i < framelen * s->channels; i++)
376  samples[i] = p[i];
377  break;
378  }
379  case 3: {
380  // shift samples for 24-bit sample format
381  int32_t *samples = (int32_t *)frame->data[0];
382 
383  for (i = 0; i < framelen * s->channels; i++)
384  samples[i] = samples[i] * 256U;
385  // reset decode buffer
386  s->decode_buffer = NULL;
387  break;
388  }
389  }
390 
391  *got_frame_ptr = 1;
392 
393  return buf_size;
394 error:
395  // reset decode buffer
396  if (s->bps == 3)
397  s->decode_buffer = NULL;
398  return ret;
399 }
400 
402  TTAContext *s = avctx->priv_data;
403 
404  if (s->bps < 3)
405  av_freep(&s->decode_buffer);
406  s->decode_buffer = NULL;
407  av_freep(&s->ch_ctx);
408 
409  return 0;
410 }
411 
412 #define OFFSET(x) offsetof(TTAContext, x)
413 #define DEC (AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM)
414 static const AVOption options[] = {
415  { "password", "Set decoding password", OFFSET(pass), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, DEC },
416  { NULL },
417 };
418 
419 static const AVClass tta_decoder_class = {
420  .class_name = "TTA Decoder",
421  .item_name = av_default_item_name,
422  .option = options,
423  .version = LIBAVUTIL_VERSION_INT,
424 };
425 
427  .p.name = "tta",
428  CODEC_LONG_NAME("TTA (True Audio)"),
429  .p.type = AVMEDIA_TYPE_AUDIO,
430  .p.id = AV_CODEC_ID_TTA,
431  .priv_data_size = sizeof(TTAContext),
433  .close = tta_decode_close,
436  .p.priv_class = &tta_decoder_class,
437  .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
438 };
error
static void error(const char *err)
Definition: target_bsf_fuzzer.c:31
tta_check_crc
static int tta_check_crc(TTAContext *s, const uint8_t *buf, int buf_size)
Definition: tta.c:76
skip_bits_long
static void skip_bits_long(GetBitContext *s, int n)
Skips the specified number of bits.
Definition: get_bits.h:291
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:602
get_bits_left
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:839
PRED
#define PRED(x, k)
r
const char * r
Definition: vf_curves.c:126
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:1007
AVCRC
uint32_t AVCRC
Definition: crc.h:46
tta_check_crc64
static uint64_t tta_check_crc64(uint8_t *pass)
Definition: tta.c:90
AVCodecContext::err_recognition
int err_recognition
Error recognition; may misdetect some more or less valid parts as errors.
Definition: avcodec.h:1351
get_bits_long
static unsigned int get_bits_long(GetBitContext *s, int n)
Read 0-32 bits.
Definition: get_bits.h:546
ff_tta_filter_init
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:325
AVPacket::data
uint8_t * data
Definition: packet.h:374
AVOption
AVOption.
Definition: opt.h:251
TTAContext
Definition: tta.c:49
FFCodec
Definition: codec_internal.h:119
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
AVChannelLayout::order
enum AVChannelOrder order
Channel order used in this layout.
Definition: channel_layout.h:306
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:311
thread.h
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:379
FFCodec::p
AVCodec p
The public AVCodec.
Definition: codec_internal.h:123
AVCodecContext::ch_layout
AVChannelLayout ch_layout
Audio channel layout.
Definition: avcodec.h:2059
tta_decoder_class
static const AVClass tta_decoder_class
Definition: tta.c:419
GetBitContext
Definition: get_bits.h:61
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:47
TTARice::sum1
uint32_t sum1
Definition: ttadata.h:35
AV_CH_LAYOUT_STEREO
#define AV_CH_LAYOUT_STEREO
Definition: channel_layout.h:211
TTAContext::channels
int channels
Definition: tta.c:54
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:219
TTAContext::dsp
TTADSPContext dsp
Definition: tta.c:63
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
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:667
AV_CODEC_ID_TTA
@ AV_CODEC_ID_TTA
Definition: codec_id.h:457
AV_CH_LOW_FREQUENCY
#define AV_CH_LOW_FREQUENCY
Definition: channel_layout.h:167
AVCodecContext::extradata_size
int extradata_size
Definition: avcodec.h:500
FF_CODEC_DECODE_CB
#define FF_CODEC_DECODE_CB(func)
Definition: codec_internal.h:298
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static av_cold int tta_decode_init(AVCodecContext *avctx)
Definition: tta.c:123
intreadwrite.h
s
#define s(width, name)
Definition: cbs_vp9.c:256
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
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static const int64_t tta_channel_layouts[7]
Definition: tta.c:66
AV_CHANNEL_ORDER_UNSPEC
@ AV_CHANNEL_ORDER_UNSPEC
Only the channel count is specified, without any further information about the channel order.
Definition: channel_layout.h:112
av_channel_layout_from_mask
FF_ENABLE_DEPRECATION_WARNINGS 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:391
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int(* init)(AVBSFContext *ctx)
Definition: dts2pts_bsf.c:363
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static int allocate_buffers(AVCodecContext *avctx)
Definition: tta.c:105
AVCodecContext::bits_per_raw_sample
int bits_per_raw_sample
Bits per sample/pixel of internal libavcodec pixel/sample format.
Definition: avcodec.h:1451
AV_LOG_DEBUG
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:201
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limits.h
TTAContext::crc_pass
uint8_t crc_pass[8]
Definition: tta.c:60
pass
#define pass
Definition: fft_template.c:608
TTAContext::crc_table
const AVCRC * crc_table
Definition: tta.c:52
CODEC_LONG_NAME
#define CODEC_LONG_NAME(str)
Definition: codec_internal.h:264
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uint32_t sum0
Definition: ttadata.h:35
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#define AV_CODEC_CAP_FRAME_THREADS
Codec supports frame-level multithreading.
Definition: codec.h:113
TTAContext::bps
int bps
Definition: tta.c:54
LIBAVUTIL_VERSION_INT
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:66
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:237
TTAFilter
Definition: ttadata.h:27
TTADSPContext
Definition: ttadsp.h:24
ff_tta_decoder
const FFCodec ff_tta_decoder
Definition: tta.c:426
DEC
#define DEC
Definition: tta.c:413
AV_EF_CRCCHECK
#define AV_EF_CRCCHECK
Verify checksums embedded in the bitstream (could be of either encoded or decoded data,...
Definition: defs.h:48
get_unary
static int get_unary(GetBitContext *gb, int stop, int len)
Get unary code of limited length.
Definition: unary.h:46
TTAContext::decode_buffer
int32_t * decode_buffer
Definition: tta.c:58
TTAContext::avctx
AVCodecContext * avctx
Definition: tta.c:51
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:109
TTAContext::last_frame_length
int last_frame_length
Definition: tta.c:56
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
AVPacket::size
int size
Definition: packet.h:375
codec_internal.h
for
for(k=2;k<=8;++k)
Definition: h264pred_template.c:425
AVCodecContext::sample_fmt
enum AVSampleFormat sample_fmt
audio sample format
Definition: avcodec.h:1023
TTAContext::data_length
unsigned data_length
Definition: tta.c:55
TTAContext::format
int format
Definition: tta.c:54
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:223
TTAContext::pass
uint8_t * pass
Definition: tta.c:61
predictor
static void predictor(uint8_t *src, ptrdiff_t size)
Definition: exrenc.c:170
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:227
AVCodecContext::bits_per_coded_sample
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:1444
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
AVCodecContext::extradata
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:499
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:128
ttadata.h
AV_CH_BACK_CENTER
#define AV_CH_BACK_CENTER
Definition: channel_layout.h:172
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:233
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:211
av_calloc
void * av_calloc(size_t nmemb, size_t size)
Definition: mem.c:272
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:1052
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:683
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:401
TTAContext::frame_length
int frame_length
Definition: tta.c:56
OFFSET
#define OFFSET(x)
Definition: tta.c:412
AVCodecContext
main external API structure.
Definition: avcodec.h:398
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:632
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:62
ttadsp.h
AVPacket
This structure stores compressed data.
Definition: packet.h:351
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:425
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:229
options
static const AVOption options[]
Definition: tta.c:414
AV_SAMPLE_FMT_S32
@ AV_SAMPLE_FMT_S32
signed 32 bits
Definition: samplefmt.h:59