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 "codec_internal.h"

42 #include "get_bits.h"

43 #include "thread.h"

44 #include "unary.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->ch_layout.nb_channels, sizeof(*s->ch_ctx));

117 if (!s->ch_ctx)

118 return AVERROR(ENOMEM);

119

120 return 0;

121 }

122

123 static av_cold int tta_decode_init(AVCodecContext * avctx)

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

160 av_channel_layout_uninit(&avctx->ch_layout);

161 if (s->channels > 1 && s->channels < 9) {

162 av_channel_layout_from_mask(&avctx->ch_layout, tta_channel_layouts[s->channels-2]);

163 }

164 if (avctx->ch_layout.nb_channels == 0) {

165 avctx->ch_layout.order = AV_CHANNEL_ORDER_UNSPEC;

166 avctx->ch_layout.nb_channels = s->channels;

167 }

168

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

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

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

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

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

174

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

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

177 return AVERROR_INVALIDDATA;

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

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

180 return AVERROR_INVALIDDATA;

181 }

182

183 switch(s->bps) {

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

185 case 2:

186 avctx->sample_fmt = AV_SAMPLE_FMT_S16;

187 break;

188 case 3:

189 avctx->sample_fmt = AV_SAMPLE_FMT_S32;

190 break;

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

192 default:

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

194 return AVERROR_INVALIDDATA;

195 }

196

197 // prevent overflow

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

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

200 return AVERROR(EINVAL);

201 }

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

203

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

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

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

207

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

209 s->format, avctx->ch_layout.nb_channels, avctx->bits_per_coded_sample, avctx->sample_rate,

210 avctx->block_align);

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

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

213

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

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

216 return AVERROR_INVALIDDATA;

217 }

218 } else {

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

220 return AVERROR_INVALIDDATA;

221 }

222

223 ff_ttadsp_init(&s->dsp);

224

225 return allocate_buffers(avctx);

226 }

227

228 static int tta_decode_frame(AVCodecContext *avctx, AVFrame *frame,

229 int *got_frame_ptr, AVPacket *avpkt)

230 {

231 const uint8_t *buf = avpkt->data;

232 int buf_size = avpkt->size;

233 TTAContext *s = avctx->priv_data;

234 GetBitContext gb;

235 int i, ret;

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

237 uint32_t *p;

238

239 if (avctx->err_recognition & AV_EF_CRCCHECK) {

240 if (buf_size < 4 ||

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

242 return AVERROR_INVALIDDATA;

243 }

244

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

246 return ret;

247

248 /* get output buffer */

249 frame->nb_samples = framelen;

250 if ((ret = ff_thread_get_buffer(avctx, frame, 0)) < 0)

251 return ret;

252

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

254 if (s->bps == 3)

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

256

257 // init per channel states

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

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

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

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

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

263 int i;

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

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

266 }

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

268 }

269

270 i = 0;

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

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

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

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

275 uint32_t unary, depth, k;

276 int32_t value;

277

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

279

280 if (unary == 0) {

281 depth = 0;

282 k = rice->k0;

283 } else {

284 depth = 1;

285 k = rice->k1;

286 unary--;

287 }

288

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

290 ret = AVERROR_INVALIDDATA;

291 goto error;

292 }

293

294 if (k) {

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

296 ret = AVERROR_INVALIDDATA;

297 goto error;

298 }

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

300 } else

301 value = unary;

302

303 // FIXME: copy paste from original

304 switch (depth) {

305 case 1:

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

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

308 rice->k1--;

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

310 rice->k1++;

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

312 default:

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

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

315 rice->k0--;

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

317 rice->k0++;

318 }

319

320 // extract coded value

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

322

323 // run hybrid filter

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

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

326

327 // fixed order prediction

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

329 switch (s->bps) {

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

331 case 2:

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

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

334 }

335 *predictor = *p;

336

337 // flip channels

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

339 cur_chan++;

340 else {

341 // decorrelate in case of multiple channels

342 if (s->channels > 1) {

343 int32_t *r = p - 1;

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

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

346 }

347 cur_chan = 0;

348 i++;

349 // check for last frame

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

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

352 break;

353 }

354 }

355 }

356

357 align_get_bits(&gb);

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

359 ret = AVERROR_INVALIDDATA;

360 goto error;

361 }

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

363

364 // convert to output buffer

365 switch (s->bps) {

366 case 1: {

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

368 p = s->decode_buffer;

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

370 samples[i] = p[i] + 0x80;

371 break;

372 }

373 case 2: {

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

375 p = s->decode_buffer;

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

377 samples[i] = p[i];

378 break;

379 }

380 case 3: {

381 // shift samples for 24-bit sample format

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

383

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

385 samples[i] = samples[i] * 256U;

386 // reset decode buffer

387 s->decode_buffer = NULL;

388 break;

389 }

390 }

391

392 *got_frame_ptr = 1;

393

394 return buf_size;

395 error:

396 // reset decode buffer

397 if (s->bps == 3)

398 s->decode_buffer = NULL;

399 return ret;

400 }

401

402 static av_cold int tta_decode_close(AVCodecContext *avctx) {

403 TTAContext *s = avctx->priv_data;

404

405 if (s->bps < 3)

406 av_freep(&s->decode_buffer);

407 s->decode_buffer = NULL;

408 av_freep(&s->ch_ctx);

409

410 return 0;

411 }

412

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

414 #define DEC (AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM)

415 static const AVOption options[] = {

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

417 { NULL },

418 };

419

420 static const AVClass tta_decoder_class = {

421 .class_name = "TTA Decoder",

422 .item_name = av_default_item_name,

423 .option = options,

424 .version = LIBAVUTIL_VERSION_INT,

425 };

426

427 const FFCodec ff_tta_decoder = {

428 .p.name = "tta",

429 CODEC_LONG_NAME("TTA (True Audio)"),

430 .p.type = AVMEDIA_TYPE_AUDIO,

431 .p.id = AV_CODEC_ID_TTA,

432 .priv_data_size = sizeof(TTAContext),

433 .init = tta_decode_init,

434 .close = tta_decode_close,

435 FF_CODEC_DECODE_CB(tta_decode_frame),

436 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS | AV_CODEC_CAP_CHANNEL_CONF,

437 .p.priv_class = &tta_decoder_class,

438 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,

439 };

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:268

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:474

get_bits_left

static int get_bits_left(GetBitContext *gb)

Definition: get_bits.h:664

PRED

#define PRED(x, k)

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:1034

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:1382

get_bits_long

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

Read 0-32 bits.

Definition: get_bits.h:411

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:330

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:127

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:325

FFCodec::p

AVCodec p

The public AVCodec.

Definition: codec_internal.h:131

AVCodecContext::ch_layout

AVChannelLayout ch_layout

Audio channel layout.

Definition: avcodec.h:2054

tta_decoder_class

static const AVClass tta_decoder_class

Definition: tta.c:420

GetBitContext

Definition: get_bits.h:107

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:524

AV_CODEC_ID_TTA

@ AV_CODEC_ID_TTA

Definition: codec_id.h:460

AV_CH_LOW_FREQUENCY

#define AV_CH_LOW_FREQUENCY

Definition: channel_layout.h:167

AVCodecContext::extradata_size

int extradata_size

Definition: avcodec.h:528

FF_CODEC_DECODE_CB

#define FF_CODEC_DECODE_CB(func)

Definition: codec_internal.h:306

tta_decode_init

static av_cold int tta_decode_init(AVCodecContext *avctx)

Definition: tta.c:123

intreadwrite.h

#define s(width, name)

Definition: cbs_vp9.c:256

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

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

init

int(* init)(AVBSFContext *ctx)

Definition: dts2pts_bsf.c:365

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:1487

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:608

TTAContext::crc_table

const AVCRC * crc_table

Definition: tta.c:52

CODEC_LONG_NAME

#define CODEC_LONG_NAME(str)

Definition: codec_internal.h:272

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:107

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:427

DEC

#define DEC

Definition: tta.c:414

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:103

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:1050

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:228

AVCodecContext::bits_per_coded_sample

int bits_per_coded_sample

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

Definition: avcodec.h:1480

#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:527

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:168

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:191

av_calloc

void * av_calloc(size_t nmemb, size_t size)

Definition: mem.c:262

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: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:540

TTARice

Definition: ttadata.h:34

AV_RL32

uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32

Definition: bytestream.h:92

#define U(x)

Definition: vpx_arith.h:37

tta_decode_close