| 1 | /* |
| 2 | * MLP decoder |
| 3 | * Copyright (c) 2007-2008 Ian Caulfield |
| 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 | * MLP decoder |
| 25 | */ |
| 26 | |
| 27 | #include <stdint.h> |
| 28 | |
| 29 | #include "avcodec.h" |
| 30 | #include "libavutil/internal.h" |
| 31 | #include "libavutil/intreadwrite.h" |
| 32 | #include "libavutil/channel_layout.h" |
| 33 | #include "get_bits.h" |
| 34 | #include "internal.h" |
| 35 | #include "libavutil/crc.h" |
| 36 | #include "parser.h" |
| 37 | #include "mlp_parser.h" |
| 38 | #include "mlpdsp.h" |
| 39 | #include "mlp.h" |
| 40 | #include "config.h" |
| 41 | |
| 42 | /** number of bits used for VLC lookup - longest Huffman code is 9 */ |
| 43 | #if ARCH_ARM |
| 44 | #define VLC_BITS 5 |
| 45 | #define VLC_STATIC_SIZE 64 |
| 46 | #else |
| 47 | #define VLC_BITS 9 |
| 48 | #define VLC_STATIC_SIZE 512 |
| 49 | #endif |
| 50 | |
| 51 | typedef struct SubStream { |
| 52 | /// Set if a valid restart header has been read. Otherwise the substream cannot be decoded. |
| 53 | uint8_t restart_seen; |
| 54 | |
| 55 | //@{ |
| 56 | /** restart header data */ |
| 57 | /// The type of noise to be used in the rematrix stage. |
| 58 | uint16_t noise_type; |
| 59 | |
| 60 | /// The index of the first channel coded in this substream. |
| 61 | uint8_t min_channel; |
| 62 | /// The index of the last channel coded in this substream. |
| 63 | uint8_t max_channel; |
| 64 | /// The number of channels input into the rematrix stage. |
| 65 | uint8_t max_matrix_channel; |
| 66 | /// For each channel output by the matrix, the output channel to map it to |
| 67 | uint8_t ch_assign[MAX_CHANNELS]; |
| 68 | /// The channel layout for this substream |
| 69 | uint64_t ch_layout; |
| 70 | /// The matrix encoding mode for this substream |
| 71 | enum AVMatrixEncoding matrix_encoding; |
| 72 | |
| 73 | /// Channel coding parameters for channels in the substream |
| 74 | ChannelParams channel_params[MAX_CHANNELS]; |
| 75 | |
| 76 | /// The left shift applied to random noise in 0x31ea substreams. |
| 77 | uint8_t noise_shift; |
| 78 | /// The current seed value for the pseudorandom noise generator(s). |
| 79 | uint32_t noisegen_seed; |
| 80 | |
| 81 | /// Set if the substream contains extra info to check the size of VLC blocks. |
| 82 | uint8_t data_check_present; |
| 83 | |
| 84 | /// Bitmask of which parameter sets are conveyed in a decoding parameter block. |
| 85 | uint8_t param_presence_flags; |
| 86 | #define PARAM_BLOCKSIZE (1 << 7) |
| 87 | #define PARAM_MATRIX (1 << 6) |
| 88 | #define PARAM_OUTSHIFT (1 << 5) |
| 89 | #define PARAM_QUANTSTEP (1 << 4) |
| 90 | #define PARAM_FIR (1 << 3) |
| 91 | #define PARAM_IIR (1 << 2) |
| 92 | #define PARAM_HUFFOFFSET (1 << 1) |
| 93 | #define PARAM_PRESENCE (1 << 0) |
| 94 | //@} |
| 95 | |
| 96 | //@{ |
| 97 | /** matrix data */ |
| 98 | |
| 99 | /// Number of matrices to be applied. |
| 100 | uint8_t num_primitive_matrices; |
| 101 | |
| 102 | /// matrix output channel |
| 103 | uint8_t matrix_out_ch[MAX_MATRICES]; |
| 104 | |
| 105 | /// Whether the LSBs of the matrix output are encoded in the bitstream. |
| 106 | uint8_t lsb_bypass[MAX_MATRICES]; |
| 107 | /// Matrix coefficients, stored as 2.14 fixed point. |
| 108 | DECLARE_ALIGNED(32, int32_t, matrix_coeff)[MAX_MATRICES][MAX_CHANNELS]; |
| 109 | /// Left shift to apply to noise values in 0x31eb substreams. |
| 110 | uint8_t matrix_noise_shift[MAX_MATRICES]; |
| 111 | //@} |
| 112 | |
| 113 | /// Left shift to apply to Huffman-decoded residuals. |
| 114 | uint8_t quant_step_size[MAX_CHANNELS]; |
| 115 | |
| 116 | /// number of PCM samples in current audio block |
| 117 | uint16_t blocksize; |
| 118 | /// Number of PCM samples decoded so far in this frame. |
| 119 | uint16_t blockpos; |
| 120 | |
| 121 | /// Left shift to apply to decoded PCM values to get final 24-bit output. |
| 122 | int8_t output_shift[MAX_CHANNELS]; |
| 123 | |
| 124 | /// Running XOR of all output samples. |
| 125 | int32_t lossless_check_data; |
| 126 | |
| 127 | } SubStream; |
| 128 | |
| 129 | typedef struct MLPDecodeContext { |
| 130 | AVCodecContext *avctx; |
| 131 | |
| 132 | /// Current access unit being read has a major sync. |
| 133 | int is_major_sync_unit; |
| 134 | |
| 135 | /// Size of the major sync unit, in bytes |
| 136 | int major_sync_header_size; |
| 137 | |
| 138 | /// Set if a valid major sync block has been read. Otherwise no decoding is possible. |
| 139 | uint8_t params_valid; |
| 140 | |
| 141 | /// Number of substreams contained within this stream. |
| 142 | uint8_t num_substreams; |
| 143 | |
| 144 | /// Index of the last substream to decode - further substreams are skipped. |
| 145 | uint8_t max_decoded_substream; |
| 146 | |
| 147 | /// Stream needs channel reordering to comply with FFmpeg's channel order |
| 148 | uint8_t needs_reordering; |
| 149 | |
| 150 | /// number of PCM samples contained in each frame |
| 151 | int access_unit_size; |
| 152 | /// next power of two above the number of samples in each frame |
| 153 | int access_unit_size_pow2; |
| 154 | |
| 155 | SubStream substream[MAX_SUBSTREAMS]; |
| 156 | |
| 157 | int matrix_changed; |
| 158 | int filter_changed[MAX_CHANNELS][NUM_FILTERS]; |
| 159 | |
| 160 | int8_t noise_buffer[MAX_BLOCKSIZE_POW2]; |
| 161 | int8_t bypassed_lsbs[MAX_BLOCKSIZE][MAX_CHANNELS]; |
| 162 | DECLARE_ALIGNED(32, int32_t, sample_buffer)[MAX_BLOCKSIZE][MAX_CHANNELS]; |
| 163 | |
| 164 | MLPDSPContext dsp; |
| 165 | } MLPDecodeContext; |
| 166 | |
| 167 | static const uint64_t thd_channel_order[] = { |
| 168 | AV_CH_FRONT_LEFT, AV_CH_FRONT_RIGHT, // LR |
| 169 | AV_CH_FRONT_CENTER, // C |
| 170 | AV_CH_LOW_FREQUENCY, // LFE |
| 171 | AV_CH_SIDE_LEFT, AV_CH_SIDE_RIGHT, // LRs |
| 172 | AV_CH_TOP_FRONT_LEFT, AV_CH_TOP_FRONT_RIGHT, // LRvh |
| 173 | AV_CH_FRONT_LEFT_OF_CENTER, AV_CH_FRONT_RIGHT_OF_CENTER, // LRc |
| 174 | AV_CH_BACK_LEFT, AV_CH_BACK_RIGHT, // LRrs |
| 175 | AV_CH_BACK_CENTER, // Cs |
| 176 | AV_CH_TOP_CENTER, // Ts |
| 177 | AV_CH_SURROUND_DIRECT_LEFT, AV_CH_SURROUND_DIRECT_RIGHT, // LRsd |
| 178 | AV_CH_WIDE_LEFT, AV_CH_WIDE_RIGHT, // LRw |
| 179 | AV_CH_TOP_FRONT_CENTER, // Cvh |
| 180 | AV_CH_LOW_FREQUENCY_2, // LFE2 |
| 181 | }; |
| 182 | |
| 183 | static uint64_t thd_channel_layout_extract_channel(uint64_t channel_layout, |
| 184 | int index) |
| 185 | { |
| 186 | int i; |
| 187 | |
| 188 | if (av_get_channel_layout_nb_channels(channel_layout) <= index) |
| 189 | return 0; |
| 190 | |
| 191 | for (i = 0; i < FF_ARRAY_ELEMS(thd_channel_order); i++) |
| 192 | if (channel_layout & thd_channel_order[i] && !index--) |
| 193 | return thd_channel_order[i]; |
| 194 | return 0; |
| 195 | } |
| 196 | |
| 197 | static VLC huff_vlc[3]; |
| 198 | |
| 199 | /** Initialize static data, constant between all invocations of the codec. */ |
| 200 | |
| 201 | static av_cold void init_static(void) |
| 202 | { |
| 203 | if (!huff_vlc[0].bits) { |
| 204 | INIT_VLC_STATIC(&huff_vlc[0], VLC_BITS, 18, |
| 205 | &ff_mlp_huffman_tables[0][0][1], 2, 1, |
| 206 | &ff_mlp_huffman_tables[0][0][0], 2, 1, VLC_STATIC_SIZE); |
| 207 | INIT_VLC_STATIC(&huff_vlc[1], VLC_BITS, 16, |
| 208 | &ff_mlp_huffman_tables[1][0][1], 2, 1, |
| 209 | &ff_mlp_huffman_tables[1][0][0], 2, 1, VLC_STATIC_SIZE); |
| 210 | INIT_VLC_STATIC(&huff_vlc[2], VLC_BITS, 15, |
| 211 | &ff_mlp_huffman_tables[2][0][1], 2, 1, |
| 212 | &ff_mlp_huffman_tables[2][0][0], 2, 1, VLC_STATIC_SIZE); |
| 213 | } |
| 214 | |
| 215 | ff_mlp_init_crc(); |
| 216 | } |
| 217 | |
| 218 | static inline int32_t calculate_sign_huff(MLPDecodeContext *m, |
| 219 | unsigned int substr, unsigned int ch) |
| 220 | { |
| 221 | SubStream *s = &m->substream[substr]; |
| 222 | ChannelParams *cp = &s->channel_params[ch]; |
| 223 | int lsb_bits = cp->huff_lsbs - s->quant_step_size[ch]; |
| 224 | int sign_shift = lsb_bits + (cp->codebook ? 2 - cp->codebook : -1); |
| 225 | int32_t sign_huff_offset = cp->huff_offset; |
| 226 | |
| 227 | if (cp->codebook > 0) |
| 228 | sign_huff_offset -= 7 << lsb_bits; |
| 229 | |
| 230 | if (sign_shift >= 0) |
| 231 | sign_huff_offset -= 1 << sign_shift; |
| 232 | |
| 233 | return sign_huff_offset; |
| 234 | } |
| 235 | |
| 236 | /** Read a sample, consisting of either, both or neither of entropy-coded MSBs |
| 237 | * and plain LSBs. */ |
| 238 | |
| 239 | static inline int read_huff_channels(MLPDecodeContext *m, GetBitContext *gbp, |
| 240 | unsigned int substr, unsigned int pos) |
| 241 | { |
| 242 | SubStream *s = &m->substream[substr]; |
| 243 | unsigned int mat, channel; |
| 244 | |
| 245 | for (mat = 0; mat < s->num_primitive_matrices; mat++) |
| 246 | if (s->lsb_bypass[mat]) |
| 247 | m->bypassed_lsbs[pos + s->blockpos][mat] = get_bits1(gbp); |
| 248 | |
| 249 | for (channel = s->min_channel; channel <= s->max_channel; channel++) { |
| 250 | ChannelParams *cp = &s->channel_params[channel]; |
| 251 | int codebook = cp->codebook; |
| 252 | int quant_step_size = s->quant_step_size[channel]; |
| 253 | int lsb_bits = cp->huff_lsbs - quant_step_size; |
| 254 | int result = 0; |
| 255 | |
| 256 | if (codebook > 0) |
| 257 | result = get_vlc2(gbp, huff_vlc[codebook-1].table, |
| 258 | VLC_BITS, (9 + VLC_BITS - 1) / VLC_BITS); |
| 259 | |
| 260 | if (result < 0) |
| 261 | return AVERROR_INVALIDDATA; |
| 262 | |
| 263 | if (lsb_bits > 0) |
| 264 | result = (result << lsb_bits) + get_bits(gbp, lsb_bits); |
| 265 | |
| 266 | result += cp->sign_huff_offset; |
| 267 | result <<= quant_step_size; |
| 268 | |
| 269 | m->sample_buffer[pos + s->blockpos][channel] = result; |
| 270 | } |
| 271 | |
| 272 | return 0; |
| 273 | } |
| 274 | |
| 275 | static av_cold int mlp_decode_init(AVCodecContext *avctx) |
| 276 | { |
| 277 | MLPDecodeContext *m = avctx->priv_data; |
| 278 | int substr; |
| 279 | |
| 280 | init_static(); |
| 281 | m->avctx = avctx; |
| 282 | for (substr = 0; substr < MAX_SUBSTREAMS; substr++) |
| 283 | m->substream[substr].lossless_check_data = 0xffffffff; |
| 284 | ff_mlpdsp_init(&m->dsp); |
| 285 | |
| 286 | return 0; |
| 287 | } |
| 288 | |
| 289 | /** Read a major sync info header - contains high level information about |
| 290 | * the stream - sample rate, channel arrangement etc. Most of this |
| 291 | * information is not actually necessary for decoding, only for playback. |
| 292 | */ |
| 293 | |
| 294 | static int read_major_sync(MLPDecodeContext *m, GetBitContext *gb) |
| 295 | { |
| 296 | MLPHeaderInfo mh; |
| 297 | int substr, ret; |
| 298 | |
| 299 | if ((ret = ff_mlp_read_major_sync(m->avctx, &mh, gb)) != 0) |
| 300 | return ret; |
| 301 | |
| 302 | if (mh.group1_bits == 0) { |
| 303 | av_log(m->avctx, AV_LOG_ERROR, "invalid/unknown bits per sample\n"); |
| 304 | return AVERROR_INVALIDDATA; |
| 305 | } |
| 306 | if (mh.group2_bits > mh.group1_bits) { |
| 307 | av_log(m->avctx, AV_LOG_ERROR, |
| 308 | "Channel group 2 cannot have more bits per sample than group 1.\n"); |
| 309 | return AVERROR_INVALIDDATA; |
| 310 | } |
| 311 | |
| 312 | if (mh.group2_samplerate && mh.group2_samplerate != mh.group1_samplerate) { |
| 313 | av_log(m->avctx, AV_LOG_ERROR, |
| 314 | "Channel groups with differing sample rates are not currently supported.\n"); |
| 315 | return AVERROR_INVALIDDATA; |
| 316 | } |
| 317 | |
| 318 | if (mh.group1_samplerate == 0) { |
| 319 | av_log(m->avctx, AV_LOG_ERROR, "invalid/unknown sampling rate\n"); |
| 320 | return AVERROR_INVALIDDATA; |
| 321 | } |
| 322 | if (mh.group1_samplerate > MAX_SAMPLERATE) { |
| 323 | av_log(m->avctx, AV_LOG_ERROR, |
| 324 | "Sampling rate %d is greater than the supported maximum (%d).\n", |
| 325 | mh.group1_samplerate, MAX_SAMPLERATE); |
| 326 | return AVERROR_INVALIDDATA; |
| 327 | } |
| 328 | if (mh.access_unit_size > MAX_BLOCKSIZE) { |
| 329 | av_log(m->avctx, AV_LOG_ERROR, |
| 330 | "Block size %d is greater than the supported maximum (%d).\n", |
| 331 | mh.access_unit_size, MAX_BLOCKSIZE); |
| 332 | return AVERROR_INVALIDDATA; |
| 333 | } |
| 334 | if (mh.access_unit_size_pow2 > MAX_BLOCKSIZE_POW2) { |
| 335 | av_log(m->avctx, AV_LOG_ERROR, |
| 336 | "Block size pow2 %d is greater than the supported maximum (%d).\n", |
| 337 | mh.access_unit_size_pow2, MAX_BLOCKSIZE_POW2); |
| 338 | return AVERROR_INVALIDDATA; |
| 339 | } |
| 340 | |
| 341 | if (mh.num_substreams == 0) |
| 342 | return AVERROR_INVALIDDATA; |
| 343 | if (m->avctx->codec_id == AV_CODEC_ID_MLP && mh.num_substreams > 2) { |
| 344 | av_log(m->avctx, AV_LOG_ERROR, "MLP only supports up to 2 substreams.\n"); |
| 345 | return AVERROR_INVALIDDATA; |
| 346 | } |
| 347 | if (mh.num_substreams > MAX_SUBSTREAMS) { |
| 348 | avpriv_request_sample(m->avctx, |
| 349 | "%d substreams (more than the " |
| 350 | "maximum supported by the decoder)", |
| 351 | mh.num_substreams); |
| 352 | return AVERROR_PATCHWELCOME; |
| 353 | } |
| 354 | |
| 355 | m->major_sync_header_size = mh.header_size; |
| 356 | |
| 357 | m->access_unit_size = mh.access_unit_size; |
| 358 | m->access_unit_size_pow2 = mh.access_unit_size_pow2; |
| 359 | |
| 360 | m->num_substreams = mh.num_substreams; |
| 361 | |
| 362 | /* limit to decoding 3 substreams, as the 4th is used by Dolby Atmos for non-audio data */ |
| 363 | m->max_decoded_substream = FFMIN(m->num_substreams - 1, 2); |
| 364 | |
| 365 | m->avctx->sample_rate = mh.group1_samplerate; |
| 366 | m->avctx->frame_size = mh.access_unit_size; |
| 367 | |
| 368 | m->avctx->bits_per_raw_sample = mh.group1_bits; |
| 369 | if (mh.group1_bits > 16) |
| 370 | m->avctx->sample_fmt = AV_SAMPLE_FMT_S32; |
| 371 | else |
| 372 | m->avctx->sample_fmt = AV_SAMPLE_FMT_S16; |
| 373 | m->dsp.mlp_pack_output = m->dsp.mlp_select_pack_output(m->substream[m->max_decoded_substream].ch_assign, |
| 374 | m->substream[m->max_decoded_substream].output_shift, |
| 375 | m->substream[m->max_decoded_substream].max_matrix_channel, |
| 376 | m->avctx->sample_fmt == AV_SAMPLE_FMT_S32); |
| 377 | |
| 378 | m->params_valid = 1; |
| 379 | for (substr = 0; substr < MAX_SUBSTREAMS; substr++) |
| 380 | m->substream[substr].restart_seen = 0; |
| 381 | |
| 382 | /* Set the layout for each substream. When there's more than one, the first |
| 383 | * substream is Stereo. Subsequent substreams' layouts are indicated in the |
| 384 | * major sync. */ |
| 385 | if (m->avctx->codec_id == AV_CODEC_ID_MLP) { |
| 386 | if (mh.stream_type != 0xbb) { |
| 387 | avpriv_request_sample(m->avctx, |
| 388 | "unexpected stream_type %X in MLP", |
| 389 | mh.stream_type); |
| 390 | return AVERROR_PATCHWELCOME; |
| 391 | } |
| 392 | if ((substr = (mh.num_substreams > 1))) |
| 393 | m->substream[0].ch_layout = AV_CH_LAYOUT_STEREO; |
| 394 | m->substream[substr].ch_layout = mh.channel_layout_mlp; |
| 395 | } else { |
| 396 | if (mh.stream_type != 0xba) { |
| 397 | avpriv_request_sample(m->avctx, |
| 398 | "unexpected stream_type %X in !MLP", |
| 399 | mh.stream_type); |
| 400 | return AVERROR_PATCHWELCOME; |
| 401 | } |
| 402 | if ((substr = (mh.num_substreams > 1))) |
| 403 | m->substream[0].ch_layout = AV_CH_LAYOUT_STEREO; |
| 404 | if (mh.num_substreams > 2) |
| 405 | if (mh.channel_layout_thd_stream2) |
| 406 | m->substream[2].ch_layout = mh.channel_layout_thd_stream2; |
| 407 | else |
| 408 | m->substream[2].ch_layout = mh.channel_layout_thd_stream1; |
| 409 | m->substream[substr].ch_layout = mh.channel_layout_thd_stream1; |
| 410 | |
| 411 | if (m->avctx->channels<=2 && m->substream[substr].ch_layout == AV_CH_LAYOUT_MONO && m->max_decoded_substream == 1) { |
| 412 | av_log(m->avctx, AV_LOG_DEBUG, "Mono stream with 2 substreams, ignoring 2nd\n"); |
| 413 | m->max_decoded_substream = 0; |
| 414 | if (m->avctx->channels==2) |
| 415 | m->avctx->channel_layout = AV_CH_LAYOUT_STEREO; |
| 416 | } |
| 417 | } |
| 418 | |
| 419 | m->needs_reordering = mh.channel_arrangement >= 18 && mh.channel_arrangement <= 20; |
| 420 | |
| 421 | /* Parse the TrueHD decoder channel modifiers and set each substream's |
| 422 | * AVMatrixEncoding accordingly. |
| 423 | * |
| 424 | * The meaning of the modifiers depends on the channel layout: |
| 425 | * |
| 426 | * - THD_CH_MODIFIER_LTRT, THD_CH_MODIFIER_LBINRBIN only apply to 2-channel |
| 427 | * |
| 428 | * - THD_CH_MODIFIER_MONO applies to 1-channel or 2-channel (dual mono) |
| 429 | * |
| 430 | * - THD_CH_MODIFIER_SURROUNDEX, THD_CH_MODIFIER_NOTSURROUNDEX only apply to |
| 431 | * layouts with an Ls/Rs channel pair |
| 432 | */ |
| 433 | for (substr = 0; substr < MAX_SUBSTREAMS; substr++) |
| 434 | m->substream[substr].matrix_encoding = AV_MATRIX_ENCODING_NONE; |
| 435 | if (m->avctx->codec_id == AV_CODEC_ID_TRUEHD) { |
| 436 | if (mh.num_substreams > 2 && |
| 437 | mh.channel_layout_thd_stream2 & AV_CH_SIDE_LEFT && |
| 438 | mh.channel_layout_thd_stream2 & AV_CH_SIDE_RIGHT && |
| 439 | mh.channel_modifier_thd_stream2 == THD_CH_MODIFIER_SURROUNDEX) |
| 440 | m->substream[2].matrix_encoding = AV_MATRIX_ENCODING_DOLBYEX; |
| 441 | |
| 442 | if (mh.num_substreams > 1 && |
| 443 | mh.channel_layout_thd_stream1 & AV_CH_SIDE_LEFT && |
| 444 | mh.channel_layout_thd_stream1 & AV_CH_SIDE_RIGHT && |
| 445 | mh.channel_modifier_thd_stream1 == THD_CH_MODIFIER_SURROUNDEX) |
| 446 | m->substream[1].matrix_encoding = AV_MATRIX_ENCODING_DOLBYEX; |
| 447 | |
| 448 | if (mh.num_substreams > 0) |
| 449 | switch (mh.channel_modifier_thd_stream0) { |
| 450 | case THD_CH_MODIFIER_LTRT: |
| 451 | m->substream[0].matrix_encoding = AV_MATRIX_ENCODING_DOLBY; |
| 452 | break; |
| 453 | case THD_CH_MODIFIER_LBINRBIN: |
| 454 | m->substream[0].matrix_encoding = AV_MATRIX_ENCODING_DOLBYHEADPHONE; |
| 455 | break; |
| 456 | default: |
| 457 | break; |
| 458 | } |
| 459 | } |
| 460 | |
| 461 | return 0; |
| 462 | } |
| 463 | |
| 464 | /** Read a restart header from a block in a substream. This contains parameters |
| 465 | * required to decode the audio that do not change very often. Generally |
| 466 | * (always) present only in blocks following a major sync. */ |
| 467 | |
| 468 | static int read_restart_header(MLPDecodeContext *m, GetBitContext *gbp, |
| 469 | const uint8_t *buf, unsigned int substr) |
| 470 | { |
| 471 | SubStream *s = &m->substream[substr]; |
| 472 | unsigned int ch; |
| 473 | int sync_word, tmp; |
| 474 | uint8_t checksum; |
| 475 | uint8_t lossless_check; |
| 476 | int start_count = get_bits_count(gbp); |
| 477 | int min_channel, max_channel, max_matrix_channel; |
| 478 | const int std_max_matrix_channel = m->avctx->codec_id == AV_CODEC_ID_MLP |
| 479 | ? MAX_MATRIX_CHANNEL_MLP |
| 480 | : MAX_MATRIX_CHANNEL_TRUEHD; |
| 481 | |
| 482 | sync_word = get_bits(gbp, 13); |
| 483 | |
| 484 | if (sync_word != 0x31ea >> 1) { |
| 485 | av_log(m->avctx, AV_LOG_ERROR, |
| 486 | "restart header sync incorrect (got 0x%04x)\n", sync_word); |
| 487 | return AVERROR_INVALIDDATA; |
| 488 | } |
| 489 | |
| 490 | s->noise_type = get_bits1(gbp); |
| 491 | |
| 492 | if (m->avctx->codec_id == AV_CODEC_ID_MLP && s->noise_type) { |
| 493 | av_log(m->avctx, AV_LOG_ERROR, "MLP must have 0x31ea sync word.\n"); |
| 494 | return AVERROR_INVALIDDATA; |
| 495 | } |
| 496 | |
| 497 | skip_bits(gbp, 16); /* Output timestamp */ |
| 498 | |
| 499 | min_channel = get_bits(gbp, 4); |
| 500 | max_channel = get_bits(gbp, 4); |
| 501 | max_matrix_channel = get_bits(gbp, 4); |
| 502 | |
| 503 | if (max_matrix_channel > std_max_matrix_channel) { |
| 504 | av_log(m->avctx, AV_LOG_ERROR, |
| 505 | "Max matrix channel cannot be greater than %d.\n", |
| 506 | std_max_matrix_channel); |
| 507 | return AVERROR_INVALIDDATA; |
| 508 | } |
| 509 | |
| 510 | if (max_channel != max_matrix_channel) { |
| 511 | av_log(m->avctx, AV_LOG_ERROR, |
| 512 | "Max channel must be equal max matrix channel.\n"); |
| 513 | return AVERROR_INVALIDDATA; |
| 514 | } |
| 515 | |
| 516 | /* This should happen for TrueHD streams with >6 channels and MLP's noise |
| 517 | * type. It is not yet known if this is allowed. */ |
| 518 | if (max_channel > MAX_MATRIX_CHANNEL_MLP && !s->noise_type) { |
| 519 | avpriv_request_sample(m->avctx, |
| 520 | "%d channels (more than the " |
| 521 | "maximum supported by the decoder)", |
| 522 | max_channel + 2); |
| 523 | return AVERROR_PATCHWELCOME; |
| 524 | } |
| 525 | |
| 526 | if (min_channel > max_channel) { |
| 527 | av_log(m->avctx, AV_LOG_ERROR, |
| 528 | "Substream min channel cannot be greater than max channel.\n"); |
| 529 | return AVERROR_INVALIDDATA; |
| 530 | } |
| 531 | |
| 532 | s->min_channel = min_channel; |
| 533 | s->max_channel = max_channel; |
| 534 | s->max_matrix_channel = max_matrix_channel; |
| 535 | |
| 536 | #if FF_API_REQUEST_CHANNELS |
| 537 | FF_DISABLE_DEPRECATION_WARNINGS |
| 538 | if (m->avctx->request_channels > 0 && |
| 539 | m->avctx->request_channels <= s->max_channel + 1 && |
| 540 | m->max_decoded_substream > substr) { |
| 541 | av_log(m->avctx, AV_LOG_DEBUG, |
| 542 | "Extracting %d-channel downmix from substream %d. " |
| 543 | "Further substreams will be skipped.\n", |
| 544 | s->max_channel + 1, substr); |
| 545 | m->max_decoded_substream = substr; |
| 546 | FF_ENABLE_DEPRECATION_WARNINGS |
| 547 | } else |
| 548 | #endif |
| 549 | if (m->avctx->request_channel_layout && (s->ch_layout & m->avctx->request_channel_layout) == |
| 550 | m->avctx->request_channel_layout && m->max_decoded_substream > substr) { |
| 551 | av_log(m->avctx, AV_LOG_DEBUG, |
| 552 | "Extracting %d-channel downmix (0x%"PRIx64") from substream %d. " |
| 553 | "Further substreams will be skipped.\n", |
| 554 | s->max_channel + 1, s->ch_layout, substr); |
| 555 | m->max_decoded_substream = substr; |
| 556 | } |
| 557 | |
| 558 | s->noise_shift = get_bits(gbp, 4); |
| 559 | s->noisegen_seed = get_bits(gbp, 23); |
| 560 | |
| 561 | skip_bits(gbp, 19); |
| 562 | |
| 563 | s->data_check_present = get_bits1(gbp); |
| 564 | lossless_check = get_bits(gbp, 8); |
| 565 | if (substr == m->max_decoded_substream |
| 566 | && s->lossless_check_data != 0xffffffff) { |
| 567 | tmp = xor_32_to_8(s->lossless_check_data); |
| 568 | if (tmp != lossless_check) |
| 569 | av_log(m->avctx, AV_LOG_WARNING, |
| 570 | "Lossless check failed - expected %02x, calculated %02x.\n", |
| 571 | lossless_check, tmp); |
| 572 | } |
| 573 | |
| 574 | skip_bits(gbp, 16); |
| 575 | |
| 576 | memset(s->ch_assign, 0, sizeof(s->ch_assign)); |
| 577 | |
| 578 | for (ch = 0; ch <= s->max_matrix_channel; ch++) { |
| 579 | int ch_assign = get_bits(gbp, 6); |
| 580 | if (m->avctx->codec_id == AV_CODEC_ID_TRUEHD) { |
| 581 | uint64_t channel = thd_channel_layout_extract_channel(s->ch_layout, |
| 582 | ch_assign); |
| 583 | ch_assign = av_get_channel_layout_channel_index(s->ch_layout, |
| 584 | channel); |
| 585 | } |
| 586 | if (ch_assign < 0 || ch_assign > s->max_matrix_channel) { |
| 587 | avpriv_request_sample(m->avctx, |
| 588 | "Assignment of matrix channel %d to invalid output channel %d", |
| 589 | ch, ch_assign); |
| 590 | return AVERROR_PATCHWELCOME; |
| 591 | } |
| 592 | s->ch_assign[ch_assign] = ch; |
| 593 | } |
| 594 | |
| 595 | checksum = ff_mlp_restart_checksum(buf, get_bits_count(gbp) - start_count); |
| 596 | |
| 597 | if (checksum != get_bits(gbp, 8)) |
| 598 | av_log(m->avctx, AV_LOG_ERROR, "restart header checksum error\n"); |
| 599 | |
| 600 | /* Set default decoding parameters. */ |
| 601 | s->param_presence_flags = 0xff; |
| 602 | s->num_primitive_matrices = 0; |
| 603 | s->blocksize = 8; |
| 604 | s->lossless_check_data = 0; |
| 605 | |
| 606 | memset(s->output_shift , 0, sizeof(s->output_shift )); |
| 607 | memset(s->quant_step_size, 0, sizeof(s->quant_step_size)); |
| 608 | |
| 609 | for (ch = s->min_channel; ch <= s->max_channel; ch++) { |
| 610 | ChannelParams *cp = &s->channel_params[ch]; |
| 611 | cp->filter_params[FIR].order = 0; |
| 612 | cp->filter_params[IIR].order = 0; |
| 613 | cp->filter_params[FIR].shift = 0; |
| 614 | cp->filter_params[IIR].shift = 0; |
| 615 | |
| 616 | /* Default audio coding is 24-bit raw PCM. */ |
| 617 | cp->huff_offset = 0; |
| 618 | cp->sign_huff_offset = (-1) << 23; |
| 619 | cp->codebook = 0; |
| 620 | cp->huff_lsbs = 24; |
| 621 | } |
| 622 | |
| 623 | if (substr == m->max_decoded_substream) { |
| 624 | m->avctx->channels = s->max_matrix_channel + 1; |
| 625 | m->avctx->channel_layout = s->ch_layout; |
| 626 | m->dsp.mlp_pack_output = m->dsp.mlp_select_pack_output(s->ch_assign, |
| 627 | s->output_shift, |
| 628 | s->max_matrix_channel, |
| 629 | m->avctx->sample_fmt == AV_SAMPLE_FMT_S32); |
| 630 | |
| 631 | if (m->avctx->codec_id == AV_CODEC_ID_MLP && m->needs_reordering) { |
| 632 | if (m->avctx->channel_layout == (AV_CH_LAYOUT_QUAD|AV_CH_LOW_FREQUENCY) || |
| 633 | m->avctx->channel_layout == AV_CH_LAYOUT_5POINT0_BACK) { |
| 634 | int i = s->ch_assign[4]; |
| 635 | s->ch_assign[4] = s->ch_assign[3]; |
| 636 | s->ch_assign[3] = s->ch_assign[2]; |
| 637 | s->ch_assign[2] = i; |
| 638 | } else if (m->avctx->channel_layout == AV_CH_LAYOUT_5POINT1_BACK) { |
| 639 | FFSWAP(int, s->ch_assign[2], s->ch_assign[4]); |
| 640 | FFSWAP(int, s->ch_assign[3], s->ch_assign[5]); |
| 641 | } |
| 642 | } |
| 643 | |
| 644 | } |
| 645 | |
| 646 | return 0; |
| 647 | } |
| 648 | |
| 649 | /** Read parameters for one of the prediction filters. */ |
| 650 | |
| 651 | static int read_filter_params(MLPDecodeContext *m, GetBitContext *gbp, |
| 652 | unsigned int substr, unsigned int channel, |
| 653 | unsigned int filter) |
| 654 | { |
| 655 | SubStream *s = &m->substream[substr]; |
| 656 | FilterParams *fp = &s->channel_params[channel].filter_params[filter]; |
| 657 | const int max_order = filter ? MAX_IIR_ORDER : MAX_FIR_ORDER; |
| 658 | const char fchar = filter ? 'I' : 'F'; |
| 659 | int i, order; |
| 660 | |
| 661 | // Filter is 0 for FIR, 1 for IIR. |
| 662 | av_assert0(filter < 2); |
| 663 | |
| 664 | if (m->filter_changed[channel][filter]++ > 1) { |
| 665 | av_log(m->avctx, AV_LOG_ERROR, "Filters may change only once per access unit.\n"); |
| 666 | return AVERROR_INVALIDDATA; |
| 667 | } |
| 668 | |
| 669 | order = get_bits(gbp, 4); |
| 670 | if (order > max_order) { |
| 671 | av_log(m->avctx, AV_LOG_ERROR, |
| 672 | "%cIR filter order %d is greater than maximum %d.\n", |
| 673 | fchar, order, max_order); |
| 674 | return AVERROR_INVALIDDATA; |
| 675 | } |
| 676 | fp->order = order; |
| 677 | |
| 678 | if (order > 0) { |
| 679 | int32_t *fcoeff = s->channel_params[channel].coeff[filter]; |
| 680 | int coeff_bits, coeff_shift; |
| 681 | |
| 682 | fp->shift = get_bits(gbp, 4); |
| 683 | |
| 684 | coeff_bits = get_bits(gbp, 5); |
| 685 | coeff_shift = get_bits(gbp, 3); |
| 686 | if (coeff_bits < 1 || coeff_bits > 16) { |
| 687 | av_log(m->avctx, AV_LOG_ERROR, |
| 688 | "%cIR filter coeff_bits must be between 1 and 16.\n", |
| 689 | fchar); |
| 690 | return AVERROR_INVALIDDATA; |
| 691 | } |
| 692 | if (coeff_bits + coeff_shift > 16) { |
| 693 | av_log(m->avctx, AV_LOG_ERROR, |
| 694 | "Sum of coeff_bits and coeff_shift for %cIR filter must be 16 or less.\n", |
| 695 | fchar); |
| 696 | return AVERROR_INVALIDDATA; |
| 697 | } |
| 698 | |
| 699 | for (i = 0; i < order; i++) |
| 700 | fcoeff[i] = get_sbits(gbp, coeff_bits) << coeff_shift; |
| 701 | |
| 702 | if (get_bits1(gbp)) { |
| 703 | int state_bits, state_shift; |
| 704 | |
| 705 | if (filter == FIR) { |
| 706 | av_log(m->avctx, AV_LOG_ERROR, |
| 707 | "FIR filter has state data specified.\n"); |
| 708 | return AVERROR_INVALIDDATA; |
| 709 | } |
| 710 | |
| 711 | state_bits = get_bits(gbp, 4); |
| 712 | state_shift = get_bits(gbp, 4); |
| 713 | |
| 714 | /* TODO: Check validity of state data. */ |
| 715 | |
| 716 | for (i = 0; i < order; i++) |
| 717 | fp->state[i] = state_bits ? get_sbits(gbp, state_bits) << state_shift : 0; |
| 718 | } |
| 719 | } |
| 720 | |
| 721 | return 0; |
| 722 | } |
| 723 | |
| 724 | /** Read parameters for primitive matrices. */ |
| 725 | |
| 726 | static int read_matrix_params(MLPDecodeContext *m, unsigned int substr, GetBitContext *gbp) |
| 727 | { |
| 728 | SubStream *s = &m->substream[substr]; |
| 729 | unsigned int mat, ch; |
| 730 | const int max_primitive_matrices = m->avctx->codec_id == AV_CODEC_ID_MLP |
| 731 | ? MAX_MATRICES_MLP |
| 732 | : MAX_MATRICES_TRUEHD; |
| 733 | |
| 734 | if (m->matrix_changed++ > 1) { |
| 735 | av_log(m->avctx, AV_LOG_ERROR, "Matrices may change only once per access unit.\n"); |
| 736 | return AVERROR_INVALIDDATA; |
| 737 | } |
| 738 | |
| 739 | s->num_primitive_matrices = get_bits(gbp, 4); |
| 740 | |
| 741 | if (s->num_primitive_matrices > max_primitive_matrices) { |
| 742 | av_log(m->avctx, AV_LOG_ERROR, |
| 743 | "Number of primitive matrices cannot be greater than %d.\n", |
| 744 | max_primitive_matrices); |
| 745 | return AVERROR_INVALIDDATA; |
| 746 | } |
| 747 | |
| 748 | for (mat = 0; mat < s->num_primitive_matrices; mat++) { |
| 749 | int frac_bits, max_chan; |
| 750 | s->matrix_out_ch[mat] = get_bits(gbp, 4); |
| 751 | frac_bits = get_bits(gbp, 4); |
| 752 | s->lsb_bypass [mat] = get_bits1(gbp); |
| 753 | |
| 754 | if (s->matrix_out_ch[mat] > s->max_matrix_channel) { |
| 755 | av_log(m->avctx, AV_LOG_ERROR, |
| 756 | "Invalid channel %d specified as output from matrix.\n", |
| 757 | s->matrix_out_ch[mat]); |
| 758 | return AVERROR_INVALIDDATA; |
| 759 | } |
| 760 | if (frac_bits > 14) { |
| 761 | av_log(m->avctx, AV_LOG_ERROR, |
| 762 | "Too many fractional bits specified.\n"); |
| 763 | return AVERROR_INVALIDDATA; |
| 764 | } |
| 765 | |
| 766 | max_chan = s->max_matrix_channel; |
| 767 | if (!s->noise_type) |
| 768 | max_chan+=2; |
| 769 | |
| 770 | for (ch = 0; ch <= max_chan; ch++) { |
| 771 | int coeff_val = 0; |
| 772 | if (get_bits1(gbp)) |
| 773 | coeff_val = get_sbits(gbp, frac_bits + 2); |
| 774 | |
| 775 | s->matrix_coeff[mat][ch] = coeff_val << (14 - frac_bits); |
| 776 | } |
| 777 | |
| 778 | if (s->noise_type) |
| 779 | s->matrix_noise_shift[mat] = get_bits(gbp, 4); |
| 780 | else |
| 781 | s->matrix_noise_shift[mat] = 0; |
| 782 | } |
| 783 | |
| 784 | return 0; |
| 785 | } |
| 786 | |
| 787 | /** Read channel parameters. */ |
| 788 | |
| 789 | static int read_channel_params(MLPDecodeContext *m, unsigned int substr, |
| 790 | GetBitContext *gbp, unsigned int ch) |
| 791 | { |
| 792 | SubStream *s = &m->substream[substr]; |
| 793 | ChannelParams *cp = &s->channel_params[ch]; |
| 794 | FilterParams *fir = &cp->filter_params[FIR]; |
| 795 | FilterParams *iir = &cp->filter_params[IIR]; |
| 796 | int ret; |
| 797 | |
| 798 | if (s->param_presence_flags & PARAM_FIR) |
| 799 | if (get_bits1(gbp)) |
| 800 | if ((ret = read_filter_params(m, gbp, substr, ch, FIR)) < 0) |
| 801 | return ret; |
| 802 | |
| 803 | if (s->param_presence_flags & PARAM_IIR) |
| 804 | if (get_bits1(gbp)) |
| 805 | if ((ret = read_filter_params(m, gbp, substr, ch, IIR)) < 0) |
| 806 | return ret; |
| 807 | |
| 808 | if (fir->order + iir->order > 8) { |
| 809 | av_log(m->avctx, AV_LOG_ERROR, "Total filter orders too high.\n"); |
| 810 | return AVERROR_INVALIDDATA; |
| 811 | } |
| 812 | |
| 813 | if (fir->order && iir->order && |
| 814 | fir->shift != iir->shift) { |
| 815 | av_log(m->avctx, AV_LOG_ERROR, |
| 816 | "FIR and IIR filters must use the same precision.\n"); |
| 817 | return AVERROR_INVALIDDATA; |
| 818 | } |
| 819 | /* The FIR and IIR filters must have the same precision. |
| 820 | * To simplify the filtering code, only the precision of the |
| 821 | * FIR filter is considered. If only the IIR filter is employed, |
| 822 | * the FIR filter precision is set to that of the IIR filter, so |
| 823 | * that the filtering code can use it. */ |
| 824 | if (!fir->order && iir->order) |
| 825 | fir->shift = iir->shift; |
| 826 | |
| 827 | if (s->param_presence_flags & PARAM_HUFFOFFSET) |
| 828 | if (get_bits1(gbp)) |
| 829 | cp->huff_offset = get_sbits(gbp, 15); |
| 830 | |
| 831 | cp->codebook = get_bits(gbp, 2); |
| 832 | cp->huff_lsbs = get_bits(gbp, 5); |
| 833 | |
| 834 | if (cp->huff_lsbs > 24) { |
| 835 | av_log(m->avctx, AV_LOG_ERROR, "Invalid huff_lsbs.\n"); |
| 836 | cp->huff_lsbs = 0; |
| 837 | return AVERROR_INVALIDDATA; |
| 838 | } |
| 839 | |
| 840 | cp->sign_huff_offset = calculate_sign_huff(m, substr, ch); |
| 841 | |
| 842 | return 0; |
| 843 | } |
| 844 | |
| 845 | /** Read decoding parameters that change more often than those in the restart |
| 846 | * header. */ |
| 847 | |
| 848 | static int read_decoding_params(MLPDecodeContext *m, GetBitContext *gbp, |
| 849 | unsigned int substr) |
| 850 | { |
| 851 | SubStream *s = &m->substream[substr]; |
| 852 | unsigned int ch; |
| 853 | int ret; |
| 854 | |
| 855 | if (s->param_presence_flags & PARAM_PRESENCE) |
| 856 | if (get_bits1(gbp)) |
| 857 | s->param_presence_flags = get_bits(gbp, 8); |
| 858 | |
| 859 | if (s->param_presence_flags & PARAM_BLOCKSIZE) |
| 860 | if (get_bits1(gbp)) { |
| 861 | s->blocksize = get_bits(gbp, 9); |
| 862 | if (s->blocksize < 8 || s->blocksize > m->access_unit_size) { |
| 863 | av_log(m->avctx, AV_LOG_ERROR, "Invalid blocksize.\n"); |
| 864 | s->blocksize = 0; |
| 865 | return AVERROR_INVALIDDATA; |
| 866 | } |
| 867 | } |
| 868 | |
| 869 | if (s->param_presence_flags & PARAM_MATRIX) |
| 870 | if (get_bits1(gbp)) |
| 871 | if ((ret = read_matrix_params(m, substr, gbp)) < 0) |
| 872 | return ret; |
| 873 | |
| 874 | if (s->param_presence_flags & PARAM_OUTSHIFT) |
| 875 | if (get_bits1(gbp)) { |
| 876 | for (ch = 0; ch <= s->max_matrix_channel; ch++) |
| 877 | s->output_shift[ch] = get_sbits(gbp, 4); |
| 878 | if (substr == m->max_decoded_substream) |
| 879 | m->dsp.mlp_pack_output = m->dsp.mlp_select_pack_output(s->ch_assign, |
| 880 | s->output_shift, |
| 881 | s->max_matrix_channel, |
| 882 | m->avctx->sample_fmt == AV_SAMPLE_FMT_S32); |
| 883 | } |
| 884 | |
| 885 | if (s->param_presence_flags & PARAM_QUANTSTEP) |
| 886 | if (get_bits1(gbp)) |
| 887 | for (ch = 0; ch <= s->max_channel; ch++) { |
| 888 | ChannelParams *cp = &s->channel_params[ch]; |
| 889 | |
| 890 | s->quant_step_size[ch] = get_bits(gbp, 4); |
| 891 | |
| 892 | cp->sign_huff_offset = calculate_sign_huff(m, substr, ch); |
| 893 | } |
| 894 | |
| 895 | for (ch = s->min_channel; ch <= s->max_channel; ch++) |
| 896 | if (get_bits1(gbp)) |
| 897 | if ((ret = read_channel_params(m, substr, gbp, ch)) < 0) |
| 898 | return ret; |
| 899 | |
| 900 | return 0; |
| 901 | } |
| 902 | |
| 903 | #define MSB_MASK(bits) (-1u << (bits)) |
| 904 | |
| 905 | /** Generate PCM samples using the prediction filters and residual values |
| 906 | * read from the data stream, and update the filter state. */ |
| 907 | |
| 908 | static void filter_channel(MLPDecodeContext *m, unsigned int substr, |
| 909 | unsigned int channel) |
| 910 | { |
| 911 | SubStream *s = &m->substream[substr]; |
| 912 | const int32_t *fircoeff = s->channel_params[channel].coeff[FIR]; |
| 913 | int32_t state_buffer[NUM_FILTERS][MAX_BLOCKSIZE + MAX_FIR_ORDER]; |
| 914 | int32_t *firbuf = state_buffer[FIR] + MAX_BLOCKSIZE; |
| 915 | int32_t *iirbuf = state_buffer[IIR] + MAX_BLOCKSIZE; |
| 916 | FilterParams *fir = &s->channel_params[channel].filter_params[FIR]; |
| 917 | FilterParams *iir = &s->channel_params[channel].filter_params[IIR]; |
| 918 | unsigned int filter_shift = fir->shift; |
| 919 | int32_t mask = MSB_MASK(s->quant_step_size[channel]); |
| 920 | |
| 921 | memcpy(firbuf, fir->state, MAX_FIR_ORDER * sizeof(int32_t)); |
| 922 | memcpy(iirbuf, iir->state, MAX_IIR_ORDER * sizeof(int32_t)); |
| 923 | |
| 924 | m->dsp.mlp_filter_channel(firbuf, fircoeff, |
| 925 | fir->order, iir->order, |
| 926 | filter_shift, mask, s->blocksize, |
| 927 | &m->sample_buffer[s->blockpos][channel]); |
| 928 | |
| 929 | memcpy(fir->state, firbuf - s->blocksize, MAX_FIR_ORDER * sizeof(int32_t)); |
| 930 | memcpy(iir->state, iirbuf - s->blocksize, MAX_IIR_ORDER * sizeof(int32_t)); |
| 931 | } |
| 932 | |
| 933 | /** Read a block of PCM residual data (or actual if no filtering active). */ |
| 934 | |
| 935 | static int read_block_data(MLPDecodeContext *m, GetBitContext *gbp, |
| 936 | unsigned int substr) |
| 937 | { |
| 938 | SubStream *s = &m->substream[substr]; |
| 939 | unsigned int i, ch, expected_stream_pos = 0; |
| 940 | int ret; |
| 941 | |
| 942 | if (s->data_check_present) { |
| 943 | expected_stream_pos = get_bits_count(gbp); |
| 944 | expected_stream_pos += get_bits(gbp, 16); |
| 945 | avpriv_request_sample(m->avctx, |
| 946 | "Substreams with VLC block size check info"); |
| 947 | } |
| 948 | |
| 949 | if (s->blockpos + s->blocksize > m->access_unit_size) { |
| 950 | av_log(m->avctx, AV_LOG_ERROR, "too many audio samples in frame\n"); |
| 951 | return AVERROR_INVALIDDATA; |
| 952 | } |
| 953 | |
| 954 | memset(&m->bypassed_lsbs[s->blockpos][0], 0, |
| 955 | s->blocksize * sizeof(m->bypassed_lsbs[0])); |
| 956 | |
| 957 | for (i = 0; i < s->blocksize; i++) |
| 958 | if ((ret = read_huff_channels(m, gbp, substr, i)) < 0) |
| 959 | return ret; |
| 960 | |
| 961 | for (ch = s->min_channel; ch <= s->max_channel; ch++) |
| 962 | filter_channel(m, substr, ch); |
| 963 | |
| 964 | s->blockpos += s->blocksize; |
| 965 | |
| 966 | if (s->data_check_present) { |
| 967 | if (get_bits_count(gbp) != expected_stream_pos) |
| 968 | av_log(m->avctx, AV_LOG_ERROR, "block data length mismatch\n"); |
| 969 | skip_bits(gbp, 8); |
| 970 | } |
| 971 | |
| 972 | return 0; |
| 973 | } |
| 974 | |
| 975 | /** Data table used for TrueHD noise generation function. */ |
| 976 | |
| 977 | static const int8_t noise_table[256] = { |
| 978 | 30, 51, 22, 54, 3, 7, -4, 38, 14, 55, 46, 81, 22, 58, -3, 2, |
| 979 | 52, 31, -7, 51, 15, 44, 74, 30, 85, -17, 10, 33, 18, 80, 28, 62, |
| 980 | 10, 32, 23, 69, 72, 26, 35, 17, 73, 60, 8, 56, 2, 6, -2, -5, |
| 981 | 51, 4, 11, 50, 66, 76, 21, 44, 33, 47, 1, 26, 64, 48, 57, 40, |
| 982 | 38, 16, -10, -28, 92, 22, -18, 29, -10, 5, -13, 49, 19, 24, 70, 34, |
| 983 | 61, 48, 30, 14, -6, 25, 58, 33, 42, 60, 67, 17, 54, 17, 22, 30, |
| 984 | 67, 44, -9, 50, -11, 43, 40, 32, 59, 82, 13, 49, -14, 55, 60, 36, |
| 985 | 48, 49, 31, 47, 15, 12, 4, 65, 1, 23, 29, 39, 45, -2, 84, 69, |
| 986 | 0, 72, 37, 57, 27, 41, -15, -16, 35, 31, 14, 61, 24, 0, 27, 24, |
| 987 | 16, 41, 55, 34, 53, 9, 56, 12, 25, 29, 53, 5, 20, -20, -8, 20, |
| 988 | 13, 28, -3, 78, 38, 16, 11, 62, 46, 29, 21, 24, 46, 65, 43, -23, |
| 989 | 89, 18, 74, 21, 38, -12, 19, 12, -19, 8, 15, 33, 4, 57, 9, -8, |
| 990 | 36, 35, 26, 28, 7, 83, 63, 79, 75, 11, 3, 87, 37, 47, 34, 40, |
| 991 | 39, 19, 20, 42, 27, 34, 39, 77, 13, 42, 59, 64, 45, -1, 32, 37, |
| 992 | 45, -5, 53, -6, 7, 36, 50, 23, 6, 32, 9, -21, 18, 71, 27, 52, |
| 993 | -25, 31, 35, 42, -1, 68, 63, 52, 26, 43, 66, 37, 41, 25, 40, 70, |
| 994 | }; |
| 995 | |
| 996 | /** Noise generation functions. |
| 997 | * I'm not sure what these are for - they seem to be some kind of pseudorandom |
| 998 | * sequence generators, used to generate noise data which is used when the |
| 999 | * channels are rematrixed. I'm not sure if they provide a practical benefit |
| 1000 | * to compression, or just obfuscate the decoder. Are they for some kind of |
| 1001 | * dithering? */ |
| 1002 | |
| 1003 | /** Generate two channels of noise, used in the matrix when |
| 1004 | * restart sync word == 0x31ea. */ |
| 1005 | |
| 1006 | static void generate_2_noise_channels(MLPDecodeContext *m, unsigned int substr) |
| 1007 | { |
| 1008 | SubStream *s = &m->substream[substr]; |
| 1009 | unsigned int i; |
| 1010 | uint32_t seed = s->noisegen_seed; |
| 1011 | unsigned int maxchan = s->max_matrix_channel; |
| 1012 | |
| 1013 | for (i = 0; i < s->blockpos; i++) { |
| 1014 | uint16_t seed_shr7 = seed >> 7; |
| 1015 | m->sample_buffer[i][maxchan+1] = ((int8_t)(seed >> 15)) << s->noise_shift; |
| 1016 | m->sample_buffer[i][maxchan+2] = ((int8_t) seed_shr7) << s->noise_shift; |
| 1017 | |
| 1018 | seed = (seed << 16) ^ seed_shr7 ^ (seed_shr7 << 5); |
| 1019 | } |
| 1020 | |
| 1021 | s->noisegen_seed = seed; |
| 1022 | } |
| 1023 | |
| 1024 | /** Generate a block of noise, used when restart sync word == 0x31eb. */ |
| 1025 | |
| 1026 | static void fill_noise_buffer(MLPDecodeContext *m, unsigned int substr) |
| 1027 | { |
| 1028 | SubStream *s = &m->substream[substr]; |
| 1029 | unsigned int i; |
| 1030 | uint32_t seed = s->noisegen_seed; |
| 1031 | |
| 1032 | for (i = 0; i < m->access_unit_size_pow2; i++) { |
| 1033 | uint8_t seed_shr15 = seed >> 15; |
| 1034 | m->noise_buffer[i] = noise_table[seed_shr15]; |
| 1035 | seed = (seed << 8) ^ seed_shr15 ^ (seed_shr15 << 5); |
| 1036 | } |
| 1037 | |
| 1038 | s->noisegen_seed = seed; |
| 1039 | } |
| 1040 | |
| 1041 | /** Write the audio data into the output buffer. */ |
| 1042 | |
| 1043 | static int output_data(MLPDecodeContext *m, unsigned int substr, |
| 1044 | AVFrame *frame, int *got_frame_ptr) |
| 1045 | { |
| 1046 | AVCodecContext *avctx = m->avctx; |
| 1047 | SubStream *s = &m->substream[substr]; |
| 1048 | unsigned int mat; |
| 1049 | unsigned int maxchan; |
| 1050 | int ret; |
| 1051 | int is32 = (m->avctx->sample_fmt == AV_SAMPLE_FMT_S32); |
| 1052 | |
| 1053 | if (m->avctx->channels != s->max_matrix_channel + 1) { |
| 1054 | av_log(m->avctx, AV_LOG_ERROR, "channel count mismatch\n"); |
| 1055 | return AVERROR_INVALIDDATA; |
| 1056 | } |
| 1057 | |
| 1058 | if (!s->blockpos) { |
| 1059 | av_log(avctx, AV_LOG_ERROR, "No samples to output.\n"); |
| 1060 | return AVERROR_INVALIDDATA; |
| 1061 | } |
| 1062 | |
| 1063 | maxchan = s->max_matrix_channel; |
| 1064 | if (!s->noise_type) { |
| 1065 | generate_2_noise_channels(m, substr); |
| 1066 | maxchan += 2; |
| 1067 | } else { |
| 1068 | fill_noise_buffer(m, substr); |
| 1069 | } |
| 1070 | |
| 1071 | /* Apply the channel matrices in turn to reconstruct the original audio |
| 1072 | * samples. */ |
| 1073 | for (mat = 0; mat < s->num_primitive_matrices; mat++) { |
| 1074 | unsigned int dest_ch = s->matrix_out_ch[mat]; |
| 1075 | m->dsp.mlp_rematrix_channel(&m->sample_buffer[0][0], |
| 1076 | s->matrix_coeff[mat], |
| 1077 | &m->bypassed_lsbs[0][mat], |
| 1078 | m->noise_buffer, |
| 1079 | s->num_primitive_matrices - mat, |
| 1080 | dest_ch, |
| 1081 | s->blockpos, |
| 1082 | maxchan, |
| 1083 | s->matrix_noise_shift[mat], |
| 1084 | m->access_unit_size_pow2, |
| 1085 | MSB_MASK(s->quant_step_size[dest_ch])); |
| 1086 | } |
| 1087 | |
| 1088 | /* get output buffer */ |
| 1089 | frame->nb_samples = s->blockpos; |
| 1090 | if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
| 1091 | return ret; |
| 1092 | s->lossless_check_data = m->dsp.mlp_pack_output(s->lossless_check_data, |
| 1093 | s->blockpos, |
| 1094 | m->sample_buffer, |
| 1095 | frame->data[0], |
| 1096 | s->ch_assign, |
| 1097 | s->output_shift, |
| 1098 | s->max_matrix_channel, |
| 1099 | is32); |
| 1100 | |
| 1101 | /* Update matrix encoding side data */ |
| 1102 | if ((ret = ff_side_data_update_matrix_encoding(frame, s->matrix_encoding)) < 0) |
| 1103 | return ret; |
| 1104 | |
| 1105 | *got_frame_ptr = 1; |
| 1106 | |
| 1107 | return 0; |
| 1108 | } |
| 1109 | |
| 1110 | /** Read an access unit from the stream. |
| 1111 | * @return negative on error, 0 if not enough data is present in the input stream, |
| 1112 | * otherwise the number of bytes consumed. */ |
| 1113 | |
| 1114 | static int read_access_unit(AVCodecContext *avctx, void* data, |
| 1115 | int *got_frame_ptr, AVPacket *avpkt) |
| 1116 | { |
| 1117 | const uint8_t *buf = avpkt->data; |
| 1118 | int buf_size = avpkt->size; |
| 1119 | MLPDecodeContext *m = avctx->priv_data; |
| 1120 | GetBitContext gb; |
| 1121 | unsigned int length, substr; |
| 1122 | unsigned int substream_start; |
| 1123 | unsigned int header_size = 4; |
| 1124 | unsigned int substr_header_size = 0; |
| 1125 | uint8_t substream_parity_present[MAX_SUBSTREAMS]; |
| 1126 | uint16_t substream_data_len[MAX_SUBSTREAMS]; |
| 1127 | uint8_t parity_bits; |
| 1128 | int ret; |
| 1129 | |
| 1130 | if (buf_size < 4) |
| 1131 | return AVERROR_INVALIDDATA; |
| 1132 | |
| 1133 | length = (AV_RB16(buf) & 0xfff) * 2; |
| 1134 | |
| 1135 | if (length < 4 || length > buf_size) |
| 1136 | return AVERROR_INVALIDDATA; |
| 1137 | |
| 1138 | init_get_bits(&gb, (buf + 4), (length - 4) * 8); |
| 1139 | |
| 1140 | m->is_major_sync_unit = 0; |
| 1141 | if (show_bits_long(&gb, 31) == (0xf8726fba >> 1)) { |
| 1142 | if (read_major_sync(m, &gb) < 0) |
| 1143 | goto error; |
| 1144 | m->is_major_sync_unit = 1; |
| 1145 | header_size += m->major_sync_header_size; |
| 1146 | } |
| 1147 | |
| 1148 | if (!m->params_valid) { |
| 1149 | av_log(m->avctx, AV_LOG_WARNING, |
| 1150 | "Stream parameters not seen; skipping frame.\n"); |
| 1151 | *got_frame_ptr = 0; |
| 1152 | return length; |
| 1153 | } |
| 1154 | |
| 1155 | substream_start = 0; |
| 1156 | |
| 1157 | for (substr = 0; substr < m->num_substreams; substr++) { |
| 1158 | int extraword_present, checkdata_present, end, nonrestart_substr; |
| 1159 | |
| 1160 | extraword_present = get_bits1(&gb); |
| 1161 | nonrestart_substr = get_bits1(&gb); |
| 1162 | checkdata_present = get_bits1(&gb); |
| 1163 | skip_bits1(&gb); |
| 1164 | |
| 1165 | end = get_bits(&gb, 12) * 2; |
| 1166 | |
| 1167 | substr_header_size += 2; |
| 1168 | |
| 1169 | if (extraword_present) { |
| 1170 | if (m->avctx->codec_id == AV_CODEC_ID_MLP) { |
| 1171 | av_log(m->avctx, AV_LOG_ERROR, "There must be no extraword for MLP.\n"); |
| 1172 | goto error; |
| 1173 | } |
| 1174 | skip_bits(&gb, 16); |
| 1175 | substr_header_size += 2; |
| 1176 | } |
| 1177 | |
| 1178 | if (!(nonrestart_substr ^ m->is_major_sync_unit)) { |
| 1179 | av_log(m->avctx, AV_LOG_ERROR, "Invalid nonrestart_substr.\n"); |
| 1180 | goto error; |
| 1181 | } |
| 1182 | |
| 1183 | if (end + header_size + substr_header_size > length) { |
| 1184 | av_log(m->avctx, AV_LOG_ERROR, |
| 1185 | "Indicated length of substream %d data goes off end of " |
| 1186 | "packet.\n", substr); |
| 1187 | end = length - header_size - substr_header_size; |
| 1188 | } |
| 1189 | |
| 1190 | if (end < substream_start) { |
| 1191 | av_log(avctx, AV_LOG_ERROR, |
| 1192 | "Indicated end offset of substream %d data " |
| 1193 | "is smaller than calculated start offset.\n", |
| 1194 | substr); |
| 1195 | goto error; |
| 1196 | } |
| 1197 | |
| 1198 | if (substr > m->max_decoded_substream) |
| 1199 | continue; |
| 1200 | |
| 1201 | substream_parity_present[substr] = checkdata_present; |
| 1202 | substream_data_len[substr] = end - substream_start; |
| 1203 | substream_start = end; |
| 1204 | } |
| 1205 | |
| 1206 | parity_bits = ff_mlp_calculate_parity(buf, 4); |
| 1207 | parity_bits ^= ff_mlp_calculate_parity(buf + header_size, substr_header_size); |
| 1208 | |
| 1209 | if ((((parity_bits >> 4) ^ parity_bits) & 0xF) != 0xF) { |
| 1210 | av_log(avctx, AV_LOG_ERROR, "Parity check failed.\n"); |
| 1211 | goto error; |
| 1212 | } |
| 1213 | |
| 1214 | buf += header_size + substr_header_size; |
| 1215 | |
| 1216 | for (substr = 0; substr <= m->max_decoded_substream; substr++) { |
| 1217 | SubStream *s = &m->substream[substr]; |
| 1218 | init_get_bits(&gb, buf, substream_data_len[substr] * 8); |
| 1219 | |
| 1220 | m->matrix_changed = 0; |
| 1221 | memset(m->filter_changed, 0, sizeof(m->filter_changed)); |
| 1222 | |
| 1223 | s->blockpos = 0; |
| 1224 | do { |
| 1225 | if (get_bits1(&gb)) { |
| 1226 | if (get_bits1(&gb)) { |
| 1227 | /* A restart header should be present. */ |
| 1228 | if (read_restart_header(m, &gb, buf, substr) < 0) |
| 1229 | goto next_substr; |
| 1230 | s->restart_seen = 1; |
| 1231 | } |
| 1232 | |
| 1233 | if (!s->restart_seen) |
| 1234 | goto next_substr; |
| 1235 | if (read_decoding_params(m, &gb, substr) < 0) |
| 1236 | goto next_substr; |
| 1237 | } |
| 1238 | |
| 1239 | if (!s->restart_seen) |
| 1240 | goto next_substr; |
| 1241 | |
| 1242 | if ((ret = read_block_data(m, &gb, substr)) < 0) |
| 1243 | return ret; |
| 1244 | |
| 1245 | if (get_bits_count(&gb) >= substream_data_len[substr] * 8) |
| 1246 | goto substream_length_mismatch; |
| 1247 | |
| 1248 | } while (!get_bits1(&gb)); |
| 1249 | |
| 1250 | skip_bits(&gb, (-get_bits_count(&gb)) & 15); |
| 1251 | |
| 1252 | if (substream_data_len[substr] * 8 - get_bits_count(&gb) >= 32) { |
| 1253 | int shorten_by; |
| 1254 | |
| 1255 | if (get_bits(&gb, 16) != 0xD234) |
| 1256 | return AVERROR_INVALIDDATA; |
| 1257 | |
| 1258 | shorten_by = get_bits(&gb, 16); |
| 1259 | if (m->avctx->codec_id == AV_CODEC_ID_TRUEHD && shorten_by & 0x2000) |
| 1260 | s->blockpos -= FFMIN(shorten_by & 0x1FFF, s->blockpos); |
| 1261 | else if (m->avctx->codec_id == AV_CODEC_ID_MLP && shorten_by != 0xD234) |
| 1262 | return AVERROR_INVALIDDATA; |
| 1263 | |
| 1264 | if (substr == m->max_decoded_substream) |
| 1265 | av_log(m->avctx, AV_LOG_INFO, "End of stream indicated.\n"); |
| 1266 | } |
| 1267 | |
| 1268 | if (substream_parity_present[substr]) { |
| 1269 | uint8_t parity, checksum; |
| 1270 | |
| 1271 | if (substream_data_len[substr] * 8 - get_bits_count(&gb) != 16) |
| 1272 | goto substream_length_mismatch; |
| 1273 | |
| 1274 | parity = ff_mlp_calculate_parity(buf, substream_data_len[substr] - 2); |
| 1275 | checksum = ff_mlp_checksum8 (buf, substream_data_len[substr] - 2); |
| 1276 | |
| 1277 | if ((get_bits(&gb, 8) ^ parity) != 0xa9 ) |
| 1278 | av_log(m->avctx, AV_LOG_ERROR, "Substream %d parity check failed.\n", substr); |
| 1279 | if ( get_bits(&gb, 8) != checksum) |
| 1280 | av_log(m->avctx, AV_LOG_ERROR, "Substream %d checksum failed.\n" , substr); |
| 1281 | } |
| 1282 | |
| 1283 | if (substream_data_len[substr] * 8 != get_bits_count(&gb)) |
| 1284 | goto substream_length_mismatch; |
| 1285 | |
| 1286 | next_substr: |
| 1287 | if (!s->restart_seen) |
| 1288 | av_log(m->avctx, AV_LOG_ERROR, |
| 1289 | "No restart header present in substream %d.\n", substr); |
| 1290 | |
| 1291 | buf += substream_data_len[substr]; |
| 1292 | } |
| 1293 | |
| 1294 | if ((ret = output_data(m, m->max_decoded_substream, data, got_frame_ptr)) < 0) |
| 1295 | return ret; |
| 1296 | |
| 1297 | return length; |
| 1298 | |
| 1299 | substream_length_mismatch: |
| 1300 | av_log(m->avctx, AV_LOG_ERROR, "substream %d length mismatch\n", substr); |
| 1301 | return AVERROR_INVALIDDATA; |
| 1302 | |
| 1303 | error: |
| 1304 | m->params_valid = 0; |
| 1305 | return AVERROR_INVALIDDATA; |
| 1306 | } |
| 1307 | |
| 1308 | #if CONFIG_MLP_DECODER |
| 1309 | AVCodec ff_mlp_decoder = { |
| 1310 | .name = "mlp", |
| 1311 | .long_name = NULL_IF_CONFIG_SMALL("MLP (Meridian Lossless Packing)"), |
| 1312 | .type = AVMEDIA_TYPE_AUDIO, |
| 1313 | .id = AV_CODEC_ID_MLP, |
| 1314 | .priv_data_size = sizeof(MLPDecodeContext), |
| 1315 | .init = mlp_decode_init, |
| 1316 | .decode = read_access_unit, |
| 1317 | .capabilities = CODEC_CAP_DR1, |
| 1318 | }; |
| 1319 | #endif |
| 1320 | #if CONFIG_TRUEHD_DECODER |
| 1321 | AVCodec ff_truehd_decoder = { |
| 1322 | .name = "truehd", |
| 1323 | .long_name = NULL_IF_CONFIG_SMALL("TrueHD"), |
| 1324 | .type = AVMEDIA_TYPE_AUDIO, |
| 1325 | .id = AV_CODEC_ID_TRUEHD, |
| 1326 | .priv_data_size = sizeof(MLPDecodeContext), |
| 1327 | .init = mlp_decode_init, |
| 1328 | .decode = read_access_unit, |
| 1329 | .capabilities = CODEC_CAP_DR1, |
| 1330 | }; |
| 1331 | #endif /* CONFIG_TRUEHD_DECODER */ |