| 1 | /* |
| 2 | * FLAC (Free Lossless Audio Codec) decoder |
| 3 | * Copyright (c) 2003 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 | * FLAC (Free Lossless Audio Codec) decoder |
| 25 | * @author Alex Beregszaszi |
| 26 | * @see http://flac.sourceforge.net/ |
| 27 | * |
| 28 | * This decoder can be used in 1 of 2 ways: Either raw FLAC data can be fed |
| 29 | * through, starting from the initial 'fLaC' signature; or by passing the |
| 30 | * 34-byte streaminfo structure through avctx->extradata[_size] followed |
| 31 | * by data starting with the 0xFFF8 marker. |
| 32 | */ |
| 33 | |
| 34 | #include <limits.h> |
| 35 | |
| 36 | #include "libavutil/avassert.h" |
| 37 | #include "libavutil/channel_layout.h" |
| 38 | #include "libavutil/crc.h" |
| 39 | #include "avcodec.h" |
| 40 | #include "internal.h" |
| 41 | #include "get_bits.h" |
| 42 | #include "bytestream.h" |
| 43 | #include "golomb.h" |
| 44 | #include "flac.h" |
| 45 | #include "flacdata.h" |
| 46 | #include "flacdsp.h" |
| 47 | #include "thread.h" |
| 48 | #include "unary.h" |
| 49 | |
| 50 | |
| 51 | typedef struct FLACContext { |
| 52 | FLACSTREAMINFO |
| 53 | |
| 54 | AVCodecContext *avctx; ///< parent AVCodecContext |
| 55 | GetBitContext gb; ///< GetBitContext initialized to start at the current frame |
| 56 | |
| 57 | int blocksize; ///< number of samples in the current frame |
| 58 | int sample_shift; ///< shift required to make output samples 16-bit or 32-bit |
| 59 | int ch_mode; ///< channel decorrelation type in the current frame |
| 60 | int got_streaminfo; ///< indicates if the STREAMINFO has been read |
| 61 | |
| 62 | int32_t *decoded[FLAC_MAX_CHANNELS]; ///< decoded samples |
| 63 | uint8_t *decoded_buffer; |
| 64 | unsigned int decoded_buffer_size; |
| 65 | |
| 66 | FLACDSPContext dsp; |
| 67 | } FLACContext; |
| 68 | |
| 69 | static int allocate_buffers(FLACContext *s); |
| 70 | |
| 71 | static void flac_set_bps(FLACContext *s) |
| 72 | { |
| 73 | enum AVSampleFormat req = s->avctx->request_sample_fmt; |
| 74 | int need32 = s->bps > 16; |
| 75 | int want32 = av_get_bytes_per_sample(req) > 2; |
| 76 | int planar = av_sample_fmt_is_planar(req); |
| 77 | |
| 78 | if (need32 || want32) { |
| 79 | if (planar) |
| 80 | s->avctx->sample_fmt = AV_SAMPLE_FMT_S32P; |
| 81 | else |
| 82 | s->avctx->sample_fmt = AV_SAMPLE_FMT_S32; |
| 83 | s->sample_shift = 32 - s->bps; |
| 84 | } else { |
| 85 | if (planar) |
| 86 | s->avctx->sample_fmt = AV_SAMPLE_FMT_S16P; |
| 87 | else |
| 88 | s->avctx->sample_fmt = AV_SAMPLE_FMT_S16; |
| 89 | s->sample_shift = 16 - s->bps; |
| 90 | } |
| 91 | } |
| 92 | |
| 93 | static av_cold int flac_decode_init(AVCodecContext *avctx) |
| 94 | { |
| 95 | enum FLACExtradataFormat format; |
| 96 | uint8_t *streaminfo; |
| 97 | int ret; |
| 98 | FLACContext *s = avctx->priv_data; |
| 99 | s->avctx = avctx; |
| 100 | |
| 101 | /* for now, the raw FLAC header is allowed to be passed to the decoder as |
| 102 | frame data instead of extradata. */ |
| 103 | if (!avctx->extradata) |
| 104 | return 0; |
| 105 | |
| 106 | if (!avpriv_flac_is_extradata_valid(avctx, &format, &streaminfo)) |
| 107 | return AVERROR_INVALIDDATA; |
| 108 | |
| 109 | /* initialize based on the demuxer-supplied streamdata header */ |
| 110 | avpriv_flac_parse_streaminfo(avctx, (FLACStreaminfo *)s, streaminfo); |
| 111 | ret = allocate_buffers(s); |
| 112 | if (ret < 0) |
| 113 | return ret; |
| 114 | flac_set_bps(s); |
| 115 | ff_flacdsp_init(&s->dsp, avctx->sample_fmt, s->bps); |
| 116 | s->got_streaminfo = 1; |
| 117 | |
| 118 | return 0; |
| 119 | } |
| 120 | |
| 121 | static void dump_headers(AVCodecContext *avctx, FLACStreaminfo *s) |
| 122 | { |
| 123 | av_log(avctx, AV_LOG_DEBUG, " Max Blocksize: %d\n", s->max_blocksize); |
| 124 | av_log(avctx, AV_LOG_DEBUG, " Max Framesize: %d\n", s->max_framesize); |
| 125 | av_log(avctx, AV_LOG_DEBUG, " Samplerate: %d\n", s->samplerate); |
| 126 | av_log(avctx, AV_LOG_DEBUG, " Channels: %d\n", s->channels); |
| 127 | av_log(avctx, AV_LOG_DEBUG, " Bits: %d\n", s->bps); |
| 128 | } |
| 129 | |
| 130 | static int allocate_buffers(FLACContext *s) |
| 131 | { |
| 132 | int buf_size; |
| 133 | int ret; |
| 134 | |
| 135 | av_assert0(s->max_blocksize); |
| 136 | |
| 137 | buf_size = av_samples_get_buffer_size(NULL, s->channels, s->max_blocksize, |
| 138 | AV_SAMPLE_FMT_S32P, 0); |
| 139 | if (buf_size < 0) |
| 140 | return buf_size; |
| 141 | |
| 142 | av_fast_malloc(&s->decoded_buffer, &s->decoded_buffer_size, buf_size); |
| 143 | if (!s->decoded_buffer) |
| 144 | return AVERROR(ENOMEM); |
| 145 | |
| 146 | ret = av_samples_fill_arrays((uint8_t **)s->decoded, NULL, |
| 147 | s->decoded_buffer, s->channels, |
| 148 | s->max_blocksize, AV_SAMPLE_FMT_S32P, 0); |
| 149 | return ret < 0 ? ret : 0; |
| 150 | } |
| 151 | |
| 152 | /** |
| 153 | * Parse the STREAMINFO from an inline header. |
| 154 | * @param s the flac decoding context |
| 155 | * @param buf input buffer, starting with the "fLaC" marker |
| 156 | * @param buf_size buffer size |
| 157 | * @return non-zero if metadata is invalid |
| 158 | */ |
| 159 | static int parse_streaminfo(FLACContext *s, const uint8_t *buf, int buf_size) |
| 160 | { |
| 161 | int metadata_type, metadata_size, ret; |
| 162 | |
| 163 | if (buf_size < FLAC_STREAMINFO_SIZE+8) { |
| 164 | /* need more data */ |
| 165 | return 0; |
| 166 | } |
| 167 | flac_parse_block_header(&buf[4], NULL, &metadata_type, &metadata_size); |
| 168 | if (metadata_type != FLAC_METADATA_TYPE_STREAMINFO || |
| 169 | metadata_size != FLAC_STREAMINFO_SIZE) { |
| 170 | return AVERROR_INVALIDDATA; |
| 171 | } |
| 172 | avpriv_flac_parse_streaminfo(s->avctx, (FLACStreaminfo *)s, &buf[8]); |
| 173 | ret = allocate_buffers(s); |
| 174 | if (ret < 0) |
| 175 | return ret; |
| 176 | flac_set_bps(s); |
| 177 | ff_flacdsp_init(&s->dsp, s->avctx->sample_fmt, s->bps); |
| 178 | s->got_streaminfo = 1; |
| 179 | |
| 180 | return 0; |
| 181 | } |
| 182 | |
| 183 | /** |
| 184 | * Determine the size of an inline header. |
| 185 | * @param buf input buffer, starting with the "fLaC" marker |
| 186 | * @param buf_size buffer size |
| 187 | * @return number of bytes in the header, or 0 if more data is needed |
| 188 | */ |
| 189 | static int get_metadata_size(const uint8_t *buf, int buf_size) |
| 190 | { |
| 191 | int metadata_last, metadata_size; |
| 192 | const uint8_t *buf_end = buf + buf_size; |
| 193 | |
| 194 | buf += 4; |
| 195 | do { |
| 196 | if (buf_end - buf < 4) |
| 197 | return 0; |
| 198 | flac_parse_block_header(buf, &metadata_last, NULL, &metadata_size); |
| 199 | buf += 4; |
| 200 | if (buf_end - buf < metadata_size) { |
| 201 | /* need more data in order to read the complete header */ |
| 202 | return 0; |
| 203 | } |
| 204 | buf += metadata_size; |
| 205 | } while (!metadata_last); |
| 206 | |
| 207 | return buf_size - (buf_end - buf); |
| 208 | } |
| 209 | |
| 210 | static int decode_residuals(FLACContext *s, int32_t *decoded, int pred_order) |
| 211 | { |
| 212 | int i, tmp, partition, method_type, rice_order; |
| 213 | int rice_bits, rice_esc; |
| 214 | int samples; |
| 215 | |
| 216 | method_type = get_bits(&s->gb, 2); |
| 217 | if (method_type > 1) { |
| 218 | av_log(s->avctx, AV_LOG_ERROR, "illegal residual coding method %d\n", |
| 219 | method_type); |
| 220 | return AVERROR_INVALIDDATA; |
| 221 | } |
| 222 | |
| 223 | rice_order = get_bits(&s->gb, 4); |
| 224 | |
| 225 | samples= s->blocksize >> rice_order; |
| 226 | if (samples << rice_order != s->blocksize) { |
| 227 | av_log(s->avctx, AV_LOG_ERROR, "invalid rice order: %i blocksize %i\n", |
| 228 | rice_order, s->blocksize); |
| 229 | return AVERROR_INVALIDDATA; |
| 230 | } |
| 231 | |
| 232 | if (pred_order > samples) { |
| 233 | av_log(s->avctx, AV_LOG_ERROR, "invalid predictor order: %i > %i\n", |
| 234 | pred_order, samples); |
| 235 | return AVERROR_INVALIDDATA; |
| 236 | } |
| 237 | |
| 238 | rice_bits = 4 + method_type; |
| 239 | rice_esc = (1 << rice_bits) - 1; |
| 240 | |
| 241 | decoded += pred_order; |
| 242 | i= pred_order; |
| 243 | for (partition = 0; partition < (1 << rice_order); partition++) { |
| 244 | tmp = get_bits(&s->gb, rice_bits); |
| 245 | if (tmp == rice_esc) { |
| 246 | tmp = get_bits(&s->gb, 5); |
| 247 | for (; i < samples; i++) |
| 248 | *decoded++ = get_sbits_long(&s->gb, tmp); |
| 249 | } else { |
| 250 | for (; i < samples; i++) { |
| 251 | *decoded++ = get_sr_golomb_flac(&s->gb, tmp, INT_MAX, 0); |
| 252 | } |
| 253 | } |
| 254 | i= 0; |
| 255 | } |
| 256 | |
| 257 | return 0; |
| 258 | } |
| 259 | |
| 260 | static int decode_subframe_fixed(FLACContext *s, int32_t *decoded, |
| 261 | int pred_order, int bps) |
| 262 | { |
| 263 | const int blocksize = s->blocksize; |
| 264 | int av_uninit(a), av_uninit(b), av_uninit(c), av_uninit(d), i; |
| 265 | int ret; |
| 266 | |
| 267 | /* warm up samples */ |
| 268 | for (i = 0; i < pred_order; i++) { |
| 269 | decoded[i] = get_sbits_long(&s->gb, bps); |
| 270 | } |
| 271 | |
| 272 | if ((ret = decode_residuals(s, decoded, pred_order)) < 0) |
| 273 | return ret; |
| 274 | |
| 275 | if (pred_order > 0) |
| 276 | a = decoded[pred_order-1]; |
| 277 | if (pred_order > 1) |
| 278 | b = a - decoded[pred_order-2]; |
| 279 | if (pred_order > 2) |
| 280 | c = b - decoded[pred_order-2] + decoded[pred_order-3]; |
| 281 | if (pred_order > 3) |
| 282 | d = c - decoded[pred_order-2] + 2*decoded[pred_order-3] - decoded[pred_order-4]; |
| 283 | |
| 284 | switch (pred_order) { |
| 285 | case 0: |
| 286 | break; |
| 287 | case 1: |
| 288 | for (i = pred_order; i < blocksize; i++) |
| 289 | decoded[i] = a += decoded[i]; |
| 290 | break; |
| 291 | case 2: |
| 292 | for (i = pred_order; i < blocksize; i++) |
| 293 | decoded[i] = a += b += decoded[i]; |
| 294 | break; |
| 295 | case 3: |
| 296 | for (i = pred_order; i < blocksize; i++) |
| 297 | decoded[i] = a += b += c += decoded[i]; |
| 298 | break; |
| 299 | case 4: |
| 300 | for (i = pred_order; i < blocksize; i++) |
| 301 | decoded[i] = a += b += c += d += decoded[i]; |
| 302 | break; |
| 303 | default: |
| 304 | av_log(s->avctx, AV_LOG_ERROR, "illegal pred order %d\n", pred_order); |
| 305 | return AVERROR_INVALIDDATA; |
| 306 | } |
| 307 | |
| 308 | return 0; |
| 309 | } |
| 310 | |
| 311 | static int decode_subframe_lpc(FLACContext *s, int32_t *decoded, int pred_order, |
| 312 | int bps) |
| 313 | { |
| 314 | int i, ret; |
| 315 | int coeff_prec, qlevel; |
| 316 | int coeffs[32]; |
| 317 | |
| 318 | /* warm up samples */ |
| 319 | for (i = 0; i < pred_order; i++) { |
| 320 | decoded[i] = get_sbits_long(&s->gb, bps); |
| 321 | } |
| 322 | |
| 323 | coeff_prec = get_bits(&s->gb, 4) + 1; |
| 324 | if (coeff_prec == 16) { |
| 325 | av_log(s->avctx, AV_LOG_ERROR, "invalid coeff precision\n"); |
| 326 | return AVERROR_INVALIDDATA; |
| 327 | } |
| 328 | qlevel = get_sbits(&s->gb, 5); |
| 329 | if (qlevel < 0) { |
| 330 | av_log(s->avctx, AV_LOG_ERROR, "qlevel %d not supported, maybe buggy stream\n", |
| 331 | qlevel); |
| 332 | return AVERROR_INVALIDDATA; |
| 333 | } |
| 334 | |
| 335 | for (i = 0; i < pred_order; i++) { |
| 336 | coeffs[pred_order - i - 1] = get_sbits(&s->gb, coeff_prec); |
| 337 | } |
| 338 | |
| 339 | if ((ret = decode_residuals(s, decoded, pred_order)) < 0) |
| 340 | return ret; |
| 341 | |
| 342 | s->dsp.lpc(decoded, coeffs, pred_order, qlevel, s->blocksize); |
| 343 | |
| 344 | return 0; |
| 345 | } |
| 346 | |
| 347 | static inline int decode_subframe(FLACContext *s, int channel) |
| 348 | { |
| 349 | int32_t *decoded = s->decoded[channel]; |
| 350 | int type, wasted = 0; |
| 351 | int bps = s->bps; |
| 352 | int i, tmp, ret; |
| 353 | |
| 354 | if (channel == 0) { |
| 355 | if (s->ch_mode == FLAC_CHMODE_RIGHT_SIDE) |
| 356 | bps++; |
| 357 | } else { |
| 358 | if (s->ch_mode == FLAC_CHMODE_LEFT_SIDE || s->ch_mode == FLAC_CHMODE_MID_SIDE) |
| 359 | bps++; |
| 360 | } |
| 361 | |
| 362 | if (get_bits1(&s->gb)) { |
| 363 | av_log(s->avctx, AV_LOG_ERROR, "invalid subframe padding\n"); |
| 364 | return AVERROR_INVALIDDATA; |
| 365 | } |
| 366 | type = get_bits(&s->gb, 6); |
| 367 | |
| 368 | if (get_bits1(&s->gb)) { |
| 369 | int left = get_bits_left(&s->gb); |
| 370 | if ( left < 0 || |
| 371 | (left < bps && !show_bits_long(&s->gb, left)) || |
| 372 | !show_bits_long(&s->gb, bps)) { |
| 373 | av_log(s->avctx, AV_LOG_ERROR, |
| 374 | "Invalid number of wasted bits > available bits (%d) - left=%d\n", |
| 375 | bps, left); |
| 376 | return AVERROR_INVALIDDATA; |
| 377 | } |
| 378 | wasted = 1 + get_unary(&s->gb, 1, get_bits_left(&s->gb)); |
| 379 | bps -= wasted; |
| 380 | } |
| 381 | if (bps > 32) { |
| 382 | avpriv_report_missing_feature(s->avctx, "Decorrelated bit depth > 32"); |
| 383 | return AVERROR_PATCHWELCOME; |
| 384 | } |
| 385 | |
| 386 | //FIXME use av_log2 for types |
| 387 | if (type == 0) { |
| 388 | tmp = get_sbits_long(&s->gb, bps); |
| 389 | for (i = 0; i < s->blocksize; i++) |
| 390 | decoded[i] = tmp; |
| 391 | } else if (type == 1) { |
| 392 | for (i = 0; i < s->blocksize; i++) |
| 393 | decoded[i] = get_sbits_long(&s->gb, bps); |
| 394 | } else if ((type >= 8) && (type <= 12)) { |
| 395 | if ((ret = decode_subframe_fixed(s, decoded, type & ~0x8, bps)) < 0) |
| 396 | return ret; |
| 397 | } else if (type >= 32) { |
| 398 | if ((ret = decode_subframe_lpc(s, decoded, (type & ~0x20)+1, bps)) < 0) |
| 399 | return ret; |
| 400 | } else { |
| 401 | av_log(s->avctx, AV_LOG_ERROR, "invalid coding type\n"); |
| 402 | return AVERROR_INVALIDDATA; |
| 403 | } |
| 404 | |
| 405 | if (wasted) { |
| 406 | int i; |
| 407 | for (i = 0; i < s->blocksize; i++) |
| 408 | decoded[i] <<= wasted; |
| 409 | } |
| 410 | |
| 411 | return 0; |
| 412 | } |
| 413 | |
| 414 | static int decode_frame(FLACContext *s) |
| 415 | { |
| 416 | int i, ret; |
| 417 | GetBitContext *gb = &s->gb; |
| 418 | FLACFrameInfo fi; |
| 419 | |
| 420 | if ((ret = ff_flac_decode_frame_header(s->avctx, gb, &fi, 0)) < 0) { |
| 421 | av_log(s->avctx, AV_LOG_ERROR, "invalid frame header\n"); |
| 422 | return ret; |
| 423 | } |
| 424 | |
| 425 | if (s->channels && fi.channels != s->channels && s->got_streaminfo) { |
| 426 | s->channels = s->avctx->channels = fi.channels; |
| 427 | ff_flac_set_channel_layout(s->avctx); |
| 428 | ret = allocate_buffers(s); |
| 429 | if (ret < 0) |
| 430 | return ret; |
| 431 | } |
| 432 | s->channels = s->avctx->channels = fi.channels; |
| 433 | if (!s->avctx->channel_layout) |
| 434 | ff_flac_set_channel_layout(s->avctx); |
| 435 | s->ch_mode = fi.ch_mode; |
| 436 | |
| 437 | if (!s->bps && !fi.bps) { |
| 438 | av_log(s->avctx, AV_LOG_ERROR, "bps not found in STREAMINFO or frame header\n"); |
| 439 | return AVERROR_INVALIDDATA; |
| 440 | } |
| 441 | if (!fi.bps) { |
| 442 | fi.bps = s->bps; |
| 443 | } else if (s->bps && fi.bps != s->bps) { |
| 444 | av_log(s->avctx, AV_LOG_ERROR, "switching bps mid-stream is not " |
| 445 | "supported\n"); |
| 446 | return AVERROR_INVALIDDATA; |
| 447 | } |
| 448 | |
| 449 | if (!s->bps) { |
| 450 | s->bps = s->avctx->bits_per_raw_sample = fi.bps; |
| 451 | flac_set_bps(s); |
| 452 | } |
| 453 | |
| 454 | if (!s->max_blocksize) |
| 455 | s->max_blocksize = FLAC_MAX_BLOCKSIZE; |
| 456 | if (fi.blocksize > s->max_blocksize) { |
| 457 | av_log(s->avctx, AV_LOG_ERROR, "blocksize %d > %d\n", fi.blocksize, |
| 458 | s->max_blocksize); |
| 459 | return AVERROR_INVALIDDATA; |
| 460 | } |
| 461 | s->blocksize = fi.blocksize; |
| 462 | |
| 463 | if (!s->samplerate && !fi.samplerate) { |
| 464 | av_log(s->avctx, AV_LOG_ERROR, "sample rate not found in STREAMINFO" |
| 465 | " or frame header\n"); |
| 466 | return AVERROR_INVALIDDATA; |
| 467 | } |
| 468 | if (fi.samplerate == 0) |
| 469 | fi.samplerate = s->samplerate; |
| 470 | s->samplerate = s->avctx->sample_rate = fi.samplerate; |
| 471 | |
| 472 | if (!s->got_streaminfo) { |
| 473 | ret = allocate_buffers(s); |
| 474 | if (ret < 0) |
| 475 | return ret; |
| 476 | ff_flacdsp_init(&s->dsp, s->avctx->sample_fmt, s->bps); |
| 477 | s->got_streaminfo = 1; |
| 478 | dump_headers(s->avctx, (FLACStreaminfo *)s); |
| 479 | } |
| 480 | |
| 481 | // dump_headers(s->avctx, (FLACStreaminfo *)s); |
| 482 | |
| 483 | /* subframes */ |
| 484 | for (i = 0; i < s->channels; i++) { |
| 485 | if ((ret = decode_subframe(s, i)) < 0) |
| 486 | return ret; |
| 487 | } |
| 488 | |
| 489 | align_get_bits(gb); |
| 490 | |
| 491 | /* frame footer */ |
| 492 | skip_bits(gb, 16); /* data crc */ |
| 493 | |
| 494 | return 0; |
| 495 | } |
| 496 | |
| 497 | static int flac_decode_frame(AVCodecContext *avctx, void *data, |
| 498 | int *got_frame_ptr, AVPacket *avpkt) |
| 499 | { |
| 500 | AVFrame *frame = data; |
| 501 | ThreadFrame tframe = { .f = data }; |
| 502 | const uint8_t *buf = avpkt->data; |
| 503 | int buf_size = avpkt->size; |
| 504 | FLACContext *s = avctx->priv_data; |
| 505 | int bytes_read = 0; |
| 506 | int ret; |
| 507 | |
| 508 | *got_frame_ptr = 0; |
| 509 | |
| 510 | if (s->max_framesize == 0) { |
| 511 | s->max_framesize = |
| 512 | ff_flac_get_max_frame_size(s->max_blocksize ? s->max_blocksize : FLAC_MAX_BLOCKSIZE, |
| 513 | FLAC_MAX_CHANNELS, 32); |
| 514 | } |
| 515 | |
| 516 | if (buf_size > 5 && !memcmp(buf, "\177FLAC", 5)) { |
| 517 | av_log(s->avctx, AV_LOG_DEBUG, "skipping flac header packet 1\n"); |
| 518 | return buf_size; |
| 519 | } |
| 520 | |
| 521 | if (buf_size > 0 && (*buf & 0x7F) == FLAC_METADATA_TYPE_VORBIS_COMMENT) { |
| 522 | av_log(s->avctx, AV_LOG_DEBUG, "skipping vorbis comment\n"); |
| 523 | return buf_size; |
| 524 | } |
| 525 | |
| 526 | /* check that there is at least the smallest decodable amount of data. |
| 527 | this amount corresponds to the smallest valid FLAC frame possible. |
| 528 | FF F8 69 02 00 00 9A 00 00 34 46 */ |
| 529 | if (buf_size < FLAC_MIN_FRAME_SIZE) |
| 530 | return buf_size; |
| 531 | |
| 532 | /* check for inline header */ |
| 533 | if (AV_RB32(buf) == MKBETAG('f','L','a','C')) { |
| 534 | if (!s->got_streaminfo && (ret = parse_streaminfo(s, buf, buf_size))) { |
| 535 | av_log(s->avctx, AV_LOG_ERROR, "invalid header\n"); |
| 536 | return ret; |
| 537 | } |
| 538 | return get_metadata_size(buf, buf_size); |
| 539 | } |
| 540 | |
| 541 | /* decode frame */ |
| 542 | if ((ret = init_get_bits8(&s->gb, buf, buf_size)) < 0) |
| 543 | return ret; |
| 544 | if ((ret = decode_frame(s)) < 0) { |
| 545 | av_log(s->avctx, AV_LOG_ERROR, "decode_frame() failed\n"); |
| 546 | return ret; |
| 547 | } |
| 548 | bytes_read = get_bits_count(&s->gb)/8; |
| 549 | |
| 550 | if ((s->avctx->err_recognition & (AV_EF_CRCCHECK|AV_EF_COMPLIANT)) && |
| 551 | av_crc(av_crc_get_table(AV_CRC_16_ANSI), |
| 552 | 0, buf, bytes_read)) { |
| 553 | av_log(s->avctx, AV_LOG_ERROR, "CRC error at PTS %"PRId64"\n", avpkt->pts); |
| 554 | if (s->avctx->err_recognition & AV_EF_EXPLODE) |
| 555 | return AVERROR_INVALIDDATA; |
| 556 | } |
| 557 | |
| 558 | /* get output buffer */ |
| 559 | frame->nb_samples = s->blocksize; |
| 560 | if ((ret = ff_thread_get_buffer(avctx, &tframe, 0)) < 0) |
| 561 | return ret; |
| 562 | |
| 563 | s->dsp.decorrelate[s->ch_mode](frame->data, s->decoded, s->channels, |
| 564 | s->blocksize, s->sample_shift); |
| 565 | |
| 566 | if (bytes_read > buf_size) { |
| 567 | av_log(s->avctx, AV_LOG_ERROR, "overread: %d\n", bytes_read - buf_size); |
| 568 | return AVERROR_INVALIDDATA; |
| 569 | } |
| 570 | if (bytes_read < buf_size) { |
| 571 | av_log(s->avctx, AV_LOG_DEBUG, "underread: %d orig size: %d\n", |
| 572 | buf_size - bytes_read, buf_size); |
| 573 | } |
| 574 | |
| 575 | *got_frame_ptr = 1; |
| 576 | |
| 577 | return bytes_read; |
| 578 | } |
| 579 | |
| 580 | static int init_thread_copy(AVCodecContext *avctx) |
| 581 | { |
| 582 | FLACContext *s = avctx->priv_data; |
| 583 | s->decoded_buffer = NULL; |
| 584 | s->decoded_buffer_size = 0; |
| 585 | s->avctx = avctx; |
| 586 | if (s->max_blocksize) |
| 587 | return allocate_buffers(s); |
| 588 | return 0; |
| 589 | } |
| 590 | |
| 591 | static av_cold int flac_decode_close(AVCodecContext *avctx) |
| 592 | { |
| 593 | FLACContext *s = avctx->priv_data; |
| 594 | |
| 595 | av_freep(&s->decoded_buffer); |
| 596 | |
| 597 | return 0; |
| 598 | } |
| 599 | |
| 600 | AVCodec ff_flac_decoder = { |
| 601 | .name = "flac", |
| 602 | .long_name = NULL_IF_CONFIG_SMALL("FLAC (Free Lossless Audio Codec)"), |
| 603 | .type = AVMEDIA_TYPE_AUDIO, |
| 604 | .id = AV_CODEC_ID_FLAC, |
| 605 | .priv_data_size = sizeof(FLACContext), |
| 606 | .init = flac_decode_init, |
| 607 | .close = flac_decode_close, |
| 608 | .decode = flac_decode_frame, |
| 609 | .init_thread_copy = ONLY_IF_THREADS_ENABLED(init_thread_copy), |
| 610 | .capabilities = CODEC_CAP_DR1 | CODEC_CAP_FRAME_THREADS, |
| 611 | .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16, |
| 612 | AV_SAMPLE_FMT_S16P, |
| 613 | AV_SAMPLE_FMT_S32, |
| 614 | AV_SAMPLE_FMT_S32P, |
| 615 | AV_SAMPLE_FMT_NONE }, |
| 616 | }; |