| 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 | #define BITSTREAM_READER_LE |
| 31 | #include <limits.h> |
| 32 | #include "ttadata.h" |
| 33 | #include "ttadsp.h" |
| 34 | #include "avcodec.h" |
| 35 | #include "get_bits.h" |
| 36 | #include "thread.h" |
| 37 | #include "unary.h" |
| 38 | #include "internal.h" |
| 39 | #include "libavutil/crc.h" |
| 40 | #include "libavutil/intreadwrite.h" |
| 41 | #include "libavutil/opt.h" |
| 42 | |
| 43 | #define FORMAT_SIMPLE 1 |
| 44 | #define FORMAT_ENCRYPTED 2 |
| 45 | |
| 46 | typedef struct TTAContext { |
| 47 | AVClass *class; |
| 48 | AVCodecContext *avctx; |
| 49 | const AVCRC *crc_table; |
| 50 | |
| 51 | int format, channels, bps; |
| 52 | unsigned data_length; |
| 53 | int frame_length, last_frame_length; |
| 54 | |
| 55 | int32_t *decode_buffer; |
| 56 | |
| 57 | uint8_t crc_pass[8]; |
| 58 | uint8_t *pass; |
| 59 | TTAChannel *ch_ctx; |
| 60 | TTADSPContext dsp; |
| 61 | } TTAContext; |
| 62 | |
| 63 | static const int64_t tta_channel_layouts[7] = { |
| 64 | AV_CH_LAYOUT_STEREO, |
| 65 | AV_CH_LAYOUT_STEREO|AV_CH_LOW_FREQUENCY, |
| 66 | AV_CH_LAYOUT_QUAD, |
| 67 | 0, |
| 68 | AV_CH_LAYOUT_5POINT1_BACK, |
| 69 | AV_CH_LAYOUT_5POINT1_BACK|AV_CH_BACK_CENTER, |
| 70 | AV_CH_LAYOUT_7POINT1_WIDE |
| 71 | }; |
| 72 | |
| 73 | static int tta_check_crc(TTAContext *s, const uint8_t *buf, int buf_size) |
| 74 | { |
| 75 | uint32_t crc, CRC; |
| 76 | |
| 77 | CRC = AV_RL32(buf + buf_size); |
| 78 | crc = av_crc(s->crc_table, 0xFFFFFFFFU, buf, buf_size); |
| 79 | if (CRC != (crc ^ 0xFFFFFFFFU)) { |
| 80 | av_log(s->avctx, AV_LOG_ERROR, "CRC error\n"); |
| 81 | return AVERROR_INVALIDDATA; |
| 82 | } |
| 83 | |
| 84 | return 0; |
| 85 | } |
| 86 | |
| 87 | static uint64_t tta_check_crc64(uint8_t *pass) |
| 88 | { |
| 89 | uint64_t crc = UINT64_MAX, poly = 0x42F0E1EBA9EA3693U; |
| 90 | uint8_t *end = pass + strlen(pass); |
| 91 | int i; |
| 92 | |
| 93 | while (pass < end) { |
| 94 | crc ^= (uint64_t)*pass++ << 56; |
| 95 | for (i = 0; i < 8; i++) |
| 96 | crc = (crc << 1) ^ (poly & (((int64_t) crc) >> 63)); |
| 97 | } |
| 98 | |
| 99 | return crc ^ UINT64_MAX; |
| 100 | } |
| 101 | |
| 102 | static int allocate_buffers(AVCodecContext *avctx) |
| 103 | { |
| 104 | TTAContext *s = avctx->priv_data; |
| 105 | |
| 106 | if (s->bps < 3) { |
| 107 | s->decode_buffer = av_mallocz_array(sizeof(int32_t)*s->frame_length, s->channels); |
| 108 | if (!s->decode_buffer) |
| 109 | return AVERROR(ENOMEM); |
| 110 | } else |
| 111 | s->decode_buffer = NULL; |
| 112 | s->ch_ctx = av_malloc_array(avctx->channels, sizeof(*s->ch_ctx)); |
| 113 | if (!s->ch_ctx) { |
| 114 | av_freep(&s->decode_buffer); |
| 115 | return AVERROR(ENOMEM); |
| 116 | } |
| 117 | |
| 118 | return 0; |
| 119 | } |
| 120 | |
| 121 | static av_cold int tta_decode_init(AVCodecContext * avctx) |
| 122 | { |
| 123 | TTAContext *s = avctx->priv_data; |
| 124 | GetBitContext gb; |
| 125 | int total_frames; |
| 126 | |
| 127 | s->avctx = avctx; |
| 128 | |
| 129 | // 30bytes includes TTA1 header |
| 130 | if (avctx->extradata_size < 22) |
| 131 | return AVERROR_INVALIDDATA; |
| 132 | |
| 133 | s->crc_table = av_crc_get_table(AV_CRC_32_IEEE_LE); |
| 134 | init_get_bits8(&gb, avctx->extradata, avctx->extradata_size); |
| 135 | if (show_bits_long(&gb, 32) == AV_RL32("TTA1")) { |
| 136 | /* signature */ |
| 137 | skip_bits_long(&gb, 32); |
| 138 | |
| 139 | s->format = get_bits(&gb, 16); |
| 140 | if (s->format > 2) { |
| 141 | av_log(avctx, AV_LOG_ERROR, "Invalid format\n"); |
| 142 | return AVERROR_INVALIDDATA; |
| 143 | } |
| 144 | if (s->format == FORMAT_ENCRYPTED) { |
| 145 | if (!s->pass) { |
| 146 | av_log(avctx, AV_LOG_ERROR, "Missing password for encrypted stream. Please use the -password option\n"); |
| 147 | return AVERROR(EINVAL); |
| 148 | } |
| 149 | AV_WL64(s->crc_pass, tta_check_crc64(s->pass)); |
| 150 | } |
| 151 | avctx->channels = s->channels = get_bits(&gb, 16); |
| 152 | if (s->channels > 1 && s->channels < 9) |
| 153 | avctx->channel_layout = tta_channel_layouts[s->channels-2]; |
| 154 | avctx->bits_per_raw_sample = get_bits(&gb, 16); |
| 155 | s->bps = (avctx->bits_per_raw_sample + 7) / 8; |
| 156 | avctx->sample_rate = get_bits_long(&gb, 32); |
| 157 | s->data_length = get_bits_long(&gb, 32); |
| 158 | skip_bits_long(&gb, 32); // CRC32 of header |
| 159 | |
| 160 | if (s->channels == 0) { |
| 161 | av_log(avctx, AV_LOG_ERROR, "Invalid number of channels\n"); |
| 162 | return AVERROR_INVALIDDATA; |
| 163 | } else if (avctx->sample_rate == 0) { |
| 164 | av_log(avctx, AV_LOG_ERROR, "Invalid samplerate\n"); |
| 165 | return AVERROR_INVALIDDATA; |
| 166 | } |
| 167 | |
| 168 | switch(s->bps) { |
| 169 | case 1: avctx->sample_fmt = AV_SAMPLE_FMT_U8; break; |
| 170 | case 2: |
| 171 | avctx->sample_fmt = AV_SAMPLE_FMT_S16; |
| 172 | break; |
| 173 | case 3: |
| 174 | avctx->sample_fmt = AV_SAMPLE_FMT_S32; |
| 175 | break; |
| 176 | //case 4: avctx->sample_fmt = AV_SAMPLE_FMT_S32; break; |
| 177 | default: |
| 178 | av_log(avctx, AV_LOG_ERROR, "Invalid/unsupported sample format.\n"); |
| 179 | return AVERROR_INVALIDDATA; |
| 180 | } |
| 181 | |
| 182 | // prevent overflow |
| 183 | if (avctx->sample_rate > 0x7FFFFFu) { |
| 184 | av_log(avctx, AV_LOG_ERROR, "sample_rate too large\n"); |
| 185 | return AVERROR(EINVAL); |
| 186 | } |
| 187 | s->frame_length = 256 * avctx->sample_rate / 245; |
| 188 | |
| 189 | s->last_frame_length = s->data_length % s->frame_length; |
| 190 | total_frames = s->data_length / s->frame_length + |
| 191 | (s->last_frame_length ? 1 : 0); |
| 192 | |
| 193 | av_log(avctx, AV_LOG_DEBUG, "format: %d chans: %d bps: %d rate: %d block: %d\n", |
| 194 | s->format, avctx->channels, avctx->bits_per_coded_sample, avctx->sample_rate, |
| 195 | avctx->block_align); |
| 196 | av_log(avctx, AV_LOG_DEBUG, "data_length: %d frame_length: %d last: %d total: %d\n", |
| 197 | s->data_length, s->frame_length, s->last_frame_length, total_frames); |
| 198 | |
| 199 | if(s->frame_length >= UINT_MAX / (s->channels * sizeof(int32_t))){ |
| 200 | av_log(avctx, AV_LOG_ERROR, "frame_length too large\n"); |
| 201 | return AVERROR_INVALIDDATA; |
| 202 | } |
| 203 | } else { |
| 204 | av_log(avctx, AV_LOG_ERROR, "Wrong extradata present\n"); |
| 205 | return AVERROR_INVALIDDATA; |
| 206 | } |
| 207 | |
| 208 | ff_ttadsp_init(&s->dsp); |
| 209 | |
| 210 | return allocate_buffers(avctx); |
| 211 | } |
| 212 | |
| 213 | static int tta_decode_frame(AVCodecContext *avctx, void *data, |
| 214 | int *got_frame_ptr, AVPacket *avpkt) |
| 215 | { |
| 216 | AVFrame *frame = data; |
| 217 | ThreadFrame tframe = { .f = data }; |
| 218 | const uint8_t *buf = avpkt->data; |
| 219 | int buf_size = avpkt->size; |
| 220 | TTAContext *s = avctx->priv_data; |
| 221 | GetBitContext gb; |
| 222 | int i, ret; |
| 223 | int cur_chan = 0, framelen = s->frame_length; |
| 224 | int32_t *p; |
| 225 | |
| 226 | if (avctx->err_recognition & AV_EF_CRCCHECK) { |
| 227 | if (buf_size < 4 || |
| 228 | (tta_check_crc(s, buf, buf_size - 4) && avctx->err_recognition & AV_EF_EXPLODE)) |
| 229 | return AVERROR_INVALIDDATA; |
| 230 | } |
| 231 | |
| 232 | if ((ret = init_get_bits8(&gb, avpkt->data, avpkt->size)) < 0) |
| 233 | return ret; |
| 234 | |
| 235 | /* get output buffer */ |
| 236 | frame->nb_samples = framelen; |
| 237 | if ((ret = ff_thread_get_buffer(avctx, &tframe, 0)) < 0) |
| 238 | return ret; |
| 239 | |
| 240 | // decode directly to output buffer for 24-bit sample format |
| 241 | if (s->bps == 3) |
| 242 | s->decode_buffer = (int32_t *)frame->data[0]; |
| 243 | |
| 244 | // init per channel states |
| 245 | for (i = 0; i < s->channels; i++) { |
| 246 | TTAFilter *filter = &s->ch_ctx[i].filter; |
| 247 | s->ch_ctx[i].predictor = 0; |
| 248 | ff_tta_filter_init(filter, ff_tta_filter_configs[s->bps-1]); |
| 249 | if (s->format == FORMAT_ENCRYPTED) { |
| 250 | int i; |
| 251 | for (i = 0; i < 8; i++) |
| 252 | filter->qm[i] = sign_extend(s->crc_pass[i], 8); |
| 253 | } |
| 254 | ff_tta_rice_init(&s->ch_ctx[i].rice, 10, 10); |
| 255 | } |
| 256 | |
| 257 | i = 0; |
| 258 | for (p = s->decode_buffer; p < s->decode_buffer + (framelen * s->channels); p++) { |
| 259 | int32_t *predictor = &s->ch_ctx[cur_chan].predictor; |
| 260 | TTAFilter *filter = &s->ch_ctx[cur_chan].filter; |
| 261 | TTARice *rice = &s->ch_ctx[cur_chan].rice; |
| 262 | uint32_t unary, depth, k; |
| 263 | int32_t value; |
| 264 | |
| 265 | unary = get_unary(&gb, 0, get_bits_left(&gb)); |
| 266 | |
| 267 | if (unary == 0) { |
| 268 | depth = 0; |
| 269 | k = rice->k0; |
| 270 | } else { |
| 271 | depth = 1; |
| 272 | k = rice->k1; |
| 273 | unary--; |
| 274 | } |
| 275 | |
| 276 | if (get_bits_left(&gb) < k) { |
| 277 | ret = AVERROR_INVALIDDATA; |
| 278 | goto error; |
| 279 | } |
| 280 | |
| 281 | if (k) { |
| 282 | if (k > MIN_CACHE_BITS) { |
| 283 | ret = AVERROR_INVALIDDATA; |
| 284 | goto error; |
| 285 | } |
| 286 | value = (unary << k) + get_bits(&gb, k); |
| 287 | } else |
| 288 | value = unary; |
| 289 | |
| 290 | // FIXME: copy paste from original |
| 291 | switch (depth) { |
| 292 | case 1: |
| 293 | rice->sum1 += value - (rice->sum1 >> 4); |
| 294 | if (rice->k1 > 0 && rice->sum1 < ff_tta_shift_16[rice->k1]) |
| 295 | rice->k1--; |
| 296 | else if(rice->sum1 > ff_tta_shift_16[rice->k1 + 1]) |
| 297 | rice->k1++; |
| 298 | value += ff_tta_shift_1[rice->k0]; |
| 299 | default: |
| 300 | rice->sum0 += value - (rice->sum0 >> 4); |
| 301 | if (rice->k0 > 0 && rice->sum0 < ff_tta_shift_16[rice->k0]) |
| 302 | rice->k0--; |
| 303 | else if(rice->sum0 > ff_tta_shift_16[rice->k0 + 1]) |
| 304 | rice->k0++; |
| 305 | } |
| 306 | |
| 307 | // extract coded value |
| 308 | *p = 1 + ((value >> 1) ^ ((value & 1) - 1)); |
| 309 | |
| 310 | // run hybrid filter |
| 311 | s->dsp.ttafilter_process_dec(filter->qm, filter->dx, filter->dl, &filter->error, p, |
| 312 | filter->shift, filter->round); |
| 313 | |
| 314 | // fixed order prediction |
| 315 | #define PRED(x, k) (int32_t)((((uint64_t)(x) << (k)) - (x)) >> (k)) |
| 316 | switch (s->bps) { |
| 317 | case 1: *p += PRED(*predictor, 4); break; |
| 318 | case 2: |
| 319 | case 3: *p += PRED(*predictor, 5); break; |
| 320 | case 4: *p += *predictor; break; |
| 321 | } |
| 322 | *predictor = *p; |
| 323 | |
| 324 | // flip channels |
| 325 | if (cur_chan < (s->channels-1)) |
| 326 | cur_chan++; |
| 327 | else { |
| 328 | // decorrelate in case of multiple channels |
| 329 | if (s->channels > 1) { |
| 330 | int32_t *r = p - 1; |
| 331 | for (*p += *r / 2; r > p - s->channels; r--) |
| 332 | *r = *(r + 1) - *r; |
| 333 | } |
| 334 | cur_chan = 0; |
| 335 | i++; |
| 336 | // check for last frame |
| 337 | if (i == s->last_frame_length && get_bits_left(&gb) / 8 == 4) { |
| 338 | frame->nb_samples = framelen = s->last_frame_length; |
| 339 | break; |
| 340 | } |
| 341 | } |
| 342 | } |
| 343 | |
| 344 | align_get_bits(&gb); |
| 345 | if (get_bits_left(&gb) < 32) { |
| 346 | ret = AVERROR_INVALIDDATA; |
| 347 | goto error; |
| 348 | } |
| 349 | skip_bits_long(&gb, 32); // frame crc |
| 350 | |
| 351 | // convert to output buffer |
| 352 | switch (s->bps) { |
| 353 | case 1: { |
| 354 | uint8_t *samples = (uint8_t *)frame->data[0]; |
| 355 | for (p = s->decode_buffer; p < s->decode_buffer + (framelen * s->channels); p++) |
| 356 | *samples++ = *p + 0x80; |
| 357 | break; |
| 358 | } |
| 359 | case 2: { |
| 360 | int16_t *samples = (int16_t *)frame->data[0]; |
| 361 | for (p = s->decode_buffer; p < s->decode_buffer + (framelen * s->channels); p++) |
| 362 | *samples++ = *p; |
| 363 | break; |
| 364 | } |
| 365 | case 3: { |
| 366 | // shift samples for 24-bit sample format |
| 367 | int32_t *samples = (int32_t *)frame->data[0]; |
| 368 | for (i = 0; i < framelen * s->channels; i++) |
| 369 | *samples++ <<= 8; |
| 370 | // reset decode buffer |
| 371 | s->decode_buffer = NULL; |
| 372 | break; |
| 373 | } |
| 374 | } |
| 375 | |
| 376 | *got_frame_ptr = 1; |
| 377 | |
| 378 | return buf_size; |
| 379 | error: |
| 380 | // reset decode buffer |
| 381 | if (s->bps == 3) |
| 382 | s->decode_buffer = NULL; |
| 383 | return ret; |
| 384 | } |
| 385 | |
| 386 | static int init_thread_copy(AVCodecContext *avctx) |
| 387 | { |
| 388 | TTAContext *s = avctx->priv_data; |
| 389 | s->avctx = avctx; |
| 390 | return allocate_buffers(avctx); |
| 391 | } |
| 392 | |
| 393 | static av_cold int tta_decode_close(AVCodecContext *avctx) { |
| 394 | TTAContext *s = avctx->priv_data; |
| 395 | |
| 396 | if (s->bps < 3) |
| 397 | av_free(s->decode_buffer); |
| 398 | s->decode_buffer = NULL; |
| 399 | av_freep(&s->ch_ctx); |
| 400 | |
| 401 | return 0; |
| 402 | } |
| 403 | |
| 404 | #define OFFSET(x) offsetof(TTAContext, x) |
| 405 | #define DEC (AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM) |
| 406 | static const AVOption options[] = { |
| 407 | { "password", "Set decoding password", OFFSET(pass), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, DEC }, |
| 408 | { NULL }, |
| 409 | }; |
| 410 | |
| 411 | static const AVClass tta_decoder_class = { |
| 412 | .class_name = "TTA Decoder", |
| 413 | .item_name = av_default_item_name, |
| 414 | .option = options, |
| 415 | .version = LIBAVUTIL_VERSION_INT, |
| 416 | }; |
| 417 | |
| 418 | AVCodec ff_tta_decoder = { |
| 419 | .name = "tta", |
| 420 | .long_name = NULL_IF_CONFIG_SMALL("TTA (True Audio)"), |
| 421 | .type = AVMEDIA_TYPE_AUDIO, |
| 422 | .id = AV_CODEC_ID_TTA, |
| 423 | .priv_data_size = sizeof(TTAContext), |
| 424 | .init = tta_decode_init, |
| 425 | .close = tta_decode_close, |
| 426 | .decode = tta_decode_frame, |
| 427 | .init_thread_copy = ONLY_IF_THREADS_ENABLED(init_thread_copy), |
| 428 | .capabilities = CODEC_CAP_DR1 | CODEC_CAP_FRAME_THREADS, |
| 429 | .priv_class = &tta_decoder_class, |
| 430 | }; |