FFmpeg: libavcodec/tta.c Source File

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tta.c

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1 /*

2 * TTA (The Lossless True Audio) decoder

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 */

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 */

30 #include <limits.h>

32 #include "libavutil/channel_layout.h"

33 #include "libavutil/crc.h"

34 #include "libavutil/intreadwrite.h"

35 #include "libavutil/opt.h"

37 #define BITSTREAM_READER_LE

38 #include "ttadata.h"

39 #include "ttadsp.h"

40 #include "avcodec.h"

41 #include "get_bits.h"

42 #include "thread.h"

43 #include "unary.h"

44 #include "internal.h"

46 #define FORMAT_SIMPLE 1

47 #define FORMAT_ENCRYPTED 2

49 typedef struct TTAContext {

50 AVClass *class;

51 AVCodecContext *avctx;

52 const AVCRC *crc_table;

54 int format, channels, bps;

55 unsigned data_length;

56 int frame_length, last_frame_length;

58 int32_t *decode_buffer;

60 uint8_t crc_pass[8];

61 uint8_t *pass;

62 TTAChannel *ch_ctx;

63 TTADSPContext dsp;

64 } TTAContext;

66 static const int64_t tta_channel_layouts[7] = {

67 AV_CH_LAYOUT_STEREO,

68 AV_CH_LAYOUT_STEREO|AV_CH_LOW_FREQUENCY,

69 AV_CH_LAYOUT_QUAD,

70 0,

71 AV_CH_LAYOUT_5POINT1_BACK,

72 AV_CH_LAYOUT_5POINT1_BACK|AV_CH_BACK_CENTER,

73 AV_CH_LAYOUT_7POINT1_WIDE

74 };

76 static int tta_check_crc(TTAContext *s, const uint8_t *buf, int buf_size)

77 {

78 uint32_t crc, CRC;

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 }

87 return 0;

88 }

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;

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

105 static int allocate_buffers(AVCodecContext *avctx)

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->channels, sizeof(*s->ch_ctx));

117 if (!s->ch_ctx) {

118 av_freep(&s->decode_buffer);

119 return AVERROR(ENOMEM);

120 }

121

122 return 0;

123 }

124

125 static av_cold int tta_decode_init(AVCodecContext * avctx)

126 {

127 TTAContext *s = avctx->priv_data;

128 GetBitContext gb;

129 int total_frames;

130 int ret;

131

132 s->avctx = avctx;

133

134 // 22 bytes for a TTA1 header

135 if (avctx->extradata_size < 22)

136 return AVERROR_INVALIDDATA;

137

138 s->crc_table = av_crc_get_table(AV_CRC_32_IEEE_LE);

139 ret = init_get_bits8(&gb, avctx->extradata, avctx->extradata_size);

140 if (ret < 0)

141 return ret;

142

143 if (show_bits_long(&gb, 32) == AV_RL32("TTA1")) {

144 /* signature */

145 skip_bits_long(&gb, 32);

146

147 s->format = get_bits(&gb, 16);

148 if (s->format > 2) {

149 av_log(avctx, AV_LOG_ERROR, "Invalid format\n");

150 return AVERROR_INVALIDDATA;

151 }

152 if (s->format == FORMAT_ENCRYPTED) {

153 if (!s->pass) {

154 av_log(avctx, AV_LOG_ERROR, "Missing password for encrypted stream. Please use the -password option\n");

155 return AVERROR(EINVAL);

156 }

157 AV_WL64(s->crc_pass, tta_check_crc64(s->pass));

158 }

159 avctx->channels = s->channels = get_bits(&gb, 16);

160 if (s->channels > 1 && s->channels < 9)

161 avctx->channel_layout = tta_channel_layouts[s->channels-2];

162 avctx->bits_per_raw_sample = get_bits(&gb, 16);

163 s->bps = (avctx->bits_per_raw_sample + 7) / 8;

164 avctx->sample_rate = get_bits_long(&gb, 32);

165 s->data_length = get_bits_long(&gb, 32);

166 skip_bits_long(&gb, 32); // CRC32 of header

167

168 if (s->channels == 0 || s->channels > 16) {

169 av_log(avctx, AV_LOG_ERROR, "Invalid number of channels\n");

170 return AVERROR_INVALIDDATA;

171 } else if (avctx->sample_rate == 0) {

172 av_log(avctx, AV_LOG_ERROR, "Invalid samplerate\n");

173 return AVERROR_INVALIDDATA;

174 }

175

176 switch(s->bps) {

177 case 1: avctx->sample_fmt = AV_SAMPLE_FMT_U8; break;

178 case 2:

179 avctx->sample_fmt = AV_SAMPLE_FMT_S16;

180 break;

181 case 3:

182 avctx->sample_fmt = AV_SAMPLE_FMT_S32;

183 break;

184 //case 4: avctx->sample_fmt = AV_SAMPLE_FMT_S32; break;

185 default:

186 av_log(avctx, AV_LOG_ERROR, "Invalid/unsupported sample format.\n");

187 return AVERROR_INVALIDDATA;

188 }

189

190 // prevent overflow

191 if (avctx->sample_rate > 0x7FFFFFu) {

192 av_log(avctx, AV_LOG_ERROR, "sample_rate too large\n");

193 return AVERROR(EINVAL);

194 }

195 s->frame_length = 256 * avctx->sample_rate / 245;

196

197 s->last_frame_length = s->data_length % s->frame_length;

198 total_frames = s->data_length / s->frame_length +

199 (s->last_frame_length ? 1 : 0);

200

201 av_log(avctx, AV_LOG_DEBUG, "format: %d chans: %d bps: %d rate: %d block: %d\n",

202 s->format, avctx->channels, avctx->bits_per_coded_sample, avctx->sample_rate,

203 avctx->block_align);

204 av_log(avctx, AV_LOG_DEBUG, "data_length: %d frame_length: %d last: %d total: %d\n",

205 s->data_length, s->frame_length, s->last_frame_length, total_frames);

206

207 if(s->frame_length >= UINT_MAX / (s->channels * sizeof(int32_t))){

208 av_log(avctx, AV_LOG_ERROR, "frame_length too large\n");

209 return AVERROR_INVALIDDATA;

210 }

211 } else {

212 av_log(avctx, AV_LOG_ERROR, "Wrong extradata present\n");

213 return AVERROR_INVALIDDATA;

214 }

215

216 ff_ttadsp_init(&s->dsp);

217

218 return allocate_buffers(avctx);

219 }

220

221 static int tta_decode_frame(AVCodecContext *avctx, void *data,

222 int *got_frame_ptr, AVPacket *avpkt)

223 {

224 AVFrame *frame = data;

225 ThreadFrame tframe = { .f = data };

226 const uint8_t *buf = avpkt->data;

227 int buf_size = avpkt->size;

228 TTAContext *s = avctx->priv_data;

229 GetBitContext gb;

230 int i, ret;

231 int cur_chan = 0, framelen = s->frame_length;

232 uint32_t *p;

233

234 if (avctx->err_recognition & AV_EF_CRCCHECK) {

235 if (buf_size < 4 ||

236 (tta_check_crc(s, buf, buf_size - 4) && avctx->err_recognition & AV_EF_EXPLODE))

237 return AVERROR_INVALIDDATA;

238 }

239

240 if ((ret = init_get_bits8(&gb, avpkt->data, avpkt->size)) < 0)

241 return ret;

242

243 /* get output buffer */

244 frame->nb_samples = framelen;

245 if ((ret = ff_thread_get_buffer(avctx, &tframe, 0)) < 0)

246 return ret;

247

248 // decode directly to output buffer for 24-bit sample format

249 if (s->bps == 3)

250 s->decode_buffer = (int32_t *)frame->data[0];

251

252 // init per channel states

253 for (i = 0; i < s->channels; i++) {

254 TTAFilter *filter = &s->ch_ctx[i].filter;

255 s->ch_ctx[i].predictor = 0;

256 ff_tta_filter_init(filter, ff_tta_filter_configs[s->bps-1]);

257 if (s->format == FORMAT_ENCRYPTED) {

258 int i;

259 for (i = 0; i < 8; i++)

260 filter->qm[i] = sign_extend(s->crc_pass[i], 8);

261 }

262 ff_tta_rice_init(&s->ch_ctx[i].rice, 10, 10);

263 }

264

265 i = 0;

266 for (p = s->decode_buffer; (int32_t*)p < s->decode_buffer + (framelen * s->channels); p++) {

267 int32_t *predictor = &s->ch_ctx[cur_chan].predictor;

268 TTAFilter *filter = &s->ch_ctx[cur_chan].filter;

269 TTARice *rice = &s->ch_ctx[cur_chan].rice;

270 uint32_t unary, depth, k;

271 int32_t value;

272

273 unary = get_unary(&gb, 0, get_bits_left(&gb));

274

275 if (unary == 0) {

276 depth = 0;

277 k = rice->k0;

278 } else {

279 depth = 1;

280 k = rice->k1;

281 unary--;

282 }

283

284 if (get_bits_left(&gb) < k) {

285 ret = AVERROR_INVALIDDATA;

286 goto error;

287 }

288

289 if (k) {

290 if (k > MIN_CACHE_BITS || unary > INT32_MAX >> k) {

291 ret = AVERROR_INVALIDDATA;

292 goto error;

293 }

294 value = (unary << k) + get_bits(&gb, k);

295 } else

296 value = unary;

297

298 // FIXME: copy paste from original

299 switch (depth) {

300 case 1:

301 rice->sum1 += value - (rice->sum1 >> 4);

302 if (rice->k1 > 0 && rice->sum1 < ff_tta_shift_16[rice->k1])

303 rice->k1--;

304 else if(rice->sum1 > ff_tta_shift_16[rice->k1 + 1])

305 rice->k1++;

306 value += ff_tta_shift_1[rice->k0];

307 default:

308 rice->sum0 += value - (rice->sum0 >> 4);

309 if (rice->k0 > 0 && rice->sum0 < ff_tta_shift_16[rice->k0])

310 rice->k0--;

311 else if(rice->sum0 > ff_tta_shift_16[rice->k0 + 1])

312 rice->k0++;

313 }

314

315 // extract coded value

316 *p = 1 + ((value >> 1) ^ ((value & 1) - 1));

317

318 // run hybrid filter

319 s->dsp.filter_process(filter->qm, filter->dx, filter->dl, &filter->error, p,

320 filter->shift, filter->round);

321

322 // fixed order prediction

323 #define PRED(x, k) (int32_t)((((uint64_t)(x) << (k)) - (x)) >> (k))

324 switch (s->bps) {

325 case 1: *p += PRED(*predictor, 4); break;

326 case 2:

327 case 3: *p += PRED(*predictor, 5); break;

328 case 4: *p += *predictor; break;

329 }

330 *predictor = *p;

331

332 // flip channels

333 if (cur_chan < (s->channels-1))

334 cur_chan++;

335 else {

336 // decorrelate in case of multiple channels

337 if (s->channels > 1) {

338 int32_t *r = p - 1;

339 for (*p += *r / 2; r > (int32_t*)p - s->channels; r--)

340 *r = *(r + 1) - *r;

341 }

342 cur_chan = 0;

343 i++;

344 // check for last frame

345 if (i == s->last_frame_length && get_bits_left(&gb) / 8 == 4) {

346 frame->nb_samples = framelen = s->last_frame_length;

347 break;

348 }

349 }

350 }

351

352 align_get_bits(&gb);

353 if (get_bits_left(&gb) < 32) {

354 ret = AVERROR_INVALIDDATA;

355 goto error;

356 }

357 skip_bits_long(&gb, 32); // frame crc

358

359 // convert to output buffer

360 switch (s->bps) {

361 case 1: {

362 uint8_t *samples = (uint8_t *)frame->data[0];

363 for (p = s->decode_buffer; (int32_t*)p < s->decode_buffer + (framelen * s->channels); p++)

364 *samples++ = *p + 0x80;

365 break;

366 }

367 case 2: {

368 int16_t *samples = (int16_t *)frame->data[0];

369 for (p = s->decode_buffer; (int32_t*)p < s->decode_buffer + (framelen * s->channels); p++)

370 *samples++ = *p;

371 break;

372 }

373 case 3: {

374 // shift samples for 24-bit sample format

375 int32_t *samples = (int32_t *)frame->data[0];

376 for (i = 0; i < framelen * s->channels; i++)

377 *samples++ *= 256;

378 // reset decode buffer

379 s->decode_buffer = NULL;

380 break;

381 }

382 }

383

384 *got_frame_ptr = 1;

385

386 return buf_size;

387 error:

388 // reset decode buffer

389 if (s->bps == 3)

390 s->decode_buffer = NULL;

391 return ret;

392 }

393

394 static av_cold int tta_decode_close(AVCodecContext *avctx) {

395 TTAContext *s = avctx->priv_data;

396

397 if (s->bps < 3)

398 av_freep(&s->decode_buffer);

399 s->decode_buffer = NULL;

400 av_freep(&s->ch_ctx);

401

402 return 0;

403 }

404

405 #define OFFSET(x) offsetof(TTAContext, x)

406 #define DEC (AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM)

407 static const AVOption options[] = {

408 { "password", "Set decoding password", OFFSET(pass), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, DEC },

409 { NULL },

410 };

411

412 static const AVClass tta_decoder_class = {

413 .class_name = "TTA Decoder",

414 .item_name = av_default_item_name,

415 .option = options,

416 .version = LIBAVUTIL_VERSION_INT,

417 };

418

419 const AVCodec ff_tta_decoder = {

420 .name = "tta",

421 .long_name = NULL_IF_CONFIG_SMALL("TTA (True Audio)"),

422 .type = AVMEDIA_TYPE_AUDIO,

423 .id = AV_CODEC_ID_TTA,

424 .priv_data_size = sizeof(TTAContext),

425 .init = tta_decode_init,

426 .close = tta_decode_close,

427 .decode = tta_decode_frame,

428 .capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS | AV_CODEC_CAP_CHANNEL_CONF,

429 .priv_class = &tta_decoder_class,

430 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,

431 };

error

static void error(const char *err)

Definition: target_bsf_fuzzer.c:31

AVCodec

AVCodec.

Definition: codec.h:202

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: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:42

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)

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:1043

AVCodecContext::sample_rate

int sample_rate

samples per second

Definition: avcodec.h:992

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:1324

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:317

internal.h

AVPacket::data

uint8_t * data

Definition: packet.h:373

AVOption

AVOption.

Definition: opt.h:247

TTAContext

Definition: tta.c:49

data

const char data[16]

Definition: mxf.c:143

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

init

static int init

Definition: av_tx.c:47

crc.h

get_bits

static unsigned int get_bits(GetBitContext *s, int n)

Read 1-25 bits.

Definition: get_bits.h:380

#define U(x)

Definition: vp56_arith.h:37

tta_decoder_class

static const AVClass tta_decoder_class

Definition: tta.c:412

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:47

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: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:99

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:678

AV_CODEC_ID_TTA

@ AV_CODEC_ID_TTA

Definition: codec_id.h:445

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:485

tta_decode_init

static av_cold int tta_decode_init(AVCodecContext *avctx)

Definition: tta.c:125

intreadwrite.h

#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:66

allocate_buffers

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:1425

AV_LOG_DEBUG

#define AV_LOG_DEBUG

Stuff which is only useful for libav* developers.

Definition: log.h:201

get_bits.h

limits.h

TTAContext::crc_pass

uint8_t crc_pass[8]

Definition: tta.c:60

pass

#define pass

Definition: fft_template.c:601

TTAContext::crc_table

const AVCRC * crc_table

Definition: tta.c:52

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: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:235

TTAFilter

Definition: ttadata.h:27

TTADSPContext

Definition: ttadsp.h:24

DEC

#define DEC

Definition: tta.c:406

AV_EF_EXPLODE

#define AV_EF_EXPLODE

abort decoding on minor error detection

Definition: avcodec.h:1335

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: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:374

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:1000

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:103

TTAContext::pass

uint8_t * pass

Definition: tta.c:61

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:993

AVCodecContext::bits_per_coded_sample

int bits_per_coded_sample

bits per sample/pixel from the demuxer (needed for huffyuv).

Definition: avcodec.h:1418

#define i(width, name, range_min, range_max)

Definition: cbs_h2645.c:271

AVCodecContext::extradata

uint8_t * extradata

some codecs need / can use extradata like Huffman tables.

Definition: avcodec.h:484

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:221

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:209

av_calloc

void * av_calloc(size_t nmemb, size_t size)

Definition: mem.c:271

avcodec.h

TTARice::k0

uint32_t k0

Definition: ttadata.h:35

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:1029

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

AV_EF_CRCCHECK

#define AV_EF_CRCCHECK

Verify checksums embedded in the bitstream (could be of either encoded or decoded data,...

Definition: avcodec.h:1332

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