| 1 | /* |
| 2 | * MPEG-4 ALS decoder |
| 3 | * Copyright (c) 2009 Thilo Borgmann <thilo.borgmann _at_ mail.de> |
| 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 | * MPEG-4 ALS decoder |
| 25 | * @author Thilo Borgmann <thilo.borgmann _at_ mail.de> |
| 26 | */ |
| 27 | |
| 28 | #include <inttypes.h> |
| 29 | |
| 30 | #include "avcodec.h" |
| 31 | #include "get_bits.h" |
| 32 | #include "unary.h" |
| 33 | #include "mpeg4audio.h" |
| 34 | #include "bytestream.h" |
| 35 | #include "bgmc.h" |
| 36 | #include "bswapdsp.h" |
| 37 | #include "internal.h" |
| 38 | #include "libavutil/samplefmt.h" |
| 39 | #include "libavutil/crc.h" |
| 40 | |
| 41 | #include <stdint.h> |
| 42 | |
| 43 | /** Rice parameters and corresponding index offsets for decoding the |
| 44 | * indices of scaled PARCOR values. The table chosen is set globally |
| 45 | * by the encoder and stored in ALSSpecificConfig. |
| 46 | */ |
| 47 | static const int8_t parcor_rice_table[3][20][2] = { |
| 48 | { {-52, 4}, {-29, 5}, {-31, 4}, { 19, 4}, {-16, 4}, |
| 49 | { 12, 3}, { -7, 3}, { 9, 3}, { -5, 3}, { 6, 3}, |
| 50 | { -4, 3}, { 3, 3}, { -3, 2}, { 3, 2}, { -2, 2}, |
| 51 | { 3, 2}, { -1, 2}, { 2, 2}, { -1, 2}, { 2, 2} }, |
| 52 | { {-58, 3}, {-42, 4}, {-46, 4}, { 37, 5}, {-36, 4}, |
| 53 | { 29, 4}, {-29, 4}, { 25, 4}, {-23, 4}, { 20, 4}, |
| 54 | {-17, 4}, { 16, 4}, {-12, 4}, { 12, 3}, {-10, 4}, |
| 55 | { 7, 3}, { -4, 4}, { 3, 3}, { -1, 3}, { 1, 3} }, |
| 56 | { {-59, 3}, {-45, 5}, {-50, 4}, { 38, 4}, {-39, 4}, |
| 57 | { 32, 4}, {-30, 4}, { 25, 3}, {-23, 3}, { 20, 3}, |
| 58 | {-20, 3}, { 16, 3}, {-13, 3}, { 10, 3}, { -7, 3}, |
| 59 | { 3, 3}, { 0, 3}, { -1, 3}, { 2, 3}, { -1, 2} } |
| 60 | }; |
| 61 | |
| 62 | |
| 63 | /** Scaled PARCOR values used for the first two PARCOR coefficients. |
| 64 | * To be indexed by the Rice coded indices. |
| 65 | * Generated by: parcor_scaled_values[i] = 32 + ((i * (i+1)) << 7) - (1 << 20) |
| 66 | * Actual values are divided by 32 in order to be stored in 16 bits. |
| 67 | */ |
| 68 | static const int16_t parcor_scaled_values[] = { |
| 69 | -1048544 / 32, -1048288 / 32, -1047776 / 32, -1047008 / 32, |
| 70 | -1045984 / 32, -1044704 / 32, -1043168 / 32, -1041376 / 32, |
| 71 | -1039328 / 32, -1037024 / 32, -1034464 / 32, -1031648 / 32, |
| 72 | -1028576 / 32, -1025248 / 32, -1021664 / 32, -1017824 / 32, |
| 73 | -1013728 / 32, -1009376 / 32, -1004768 / 32, -999904 / 32, |
| 74 | -994784 / 32, -989408 / 32, -983776 / 32, -977888 / 32, |
| 75 | -971744 / 32, -965344 / 32, -958688 / 32, -951776 / 32, |
| 76 | -944608 / 32, -937184 / 32, -929504 / 32, -921568 / 32, |
| 77 | -913376 / 32, -904928 / 32, -896224 / 32, -887264 / 32, |
| 78 | -878048 / 32, -868576 / 32, -858848 / 32, -848864 / 32, |
| 79 | -838624 / 32, -828128 / 32, -817376 / 32, -806368 / 32, |
| 80 | -795104 / 32, -783584 / 32, -771808 / 32, -759776 / 32, |
| 81 | -747488 / 32, -734944 / 32, -722144 / 32, -709088 / 32, |
| 82 | -695776 / 32, -682208 / 32, -668384 / 32, -654304 / 32, |
| 83 | -639968 / 32, -625376 / 32, -610528 / 32, -595424 / 32, |
| 84 | -580064 / 32, -564448 / 32, -548576 / 32, -532448 / 32, |
| 85 | -516064 / 32, -499424 / 32, -482528 / 32, -465376 / 32, |
| 86 | -447968 / 32, -430304 / 32, -412384 / 32, -394208 / 32, |
| 87 | -375776 / 32, -357088 / 32, -338144 / 32, -318944 / 32, |
| 88 | -299488 / 32, -279776 / 32, -259808 / 32, -239584 / 32, |
| 89 | -219104 / 32, -198368 / 32, -177376 / 32, -156128 / 32, |
| 90 | -134624 / 32, -112864 / 32, -90848 / 32, -68576 / 32, |
| 91 | -46048 / 32, -23264 / 32, -224 / 32, 23072 / 32, |
| 92 | 46624 / 32, 70432 / 32, 94496 / 32, 118816 / 32, |
| 93 | 143392 / 32, 168224 / 32, 193312 / 32, 218656 / 32, |
| 94 | 244256 / 32, 270112 / 32, 296224 / 32, 322592 / 32, |
| 95 | 349216 / 32, 376096 / 32, 403232 / 32, 430624 / 32, |
| 96 | 458272 / 32, 486176 / 32, 514336 / 32, 542752 / 32, |
| 97 | 571424 / 32, 600352 / 32, 629536 / 32, 658976 / 32, |
| 98 | 688672 / 32, 718624 / 32, 748832 / 32, 779296 / 32, |
| 99 | 810016 / 32, 840992 / 32, 872224 / 32, 903712 / 32, |
| 100 | 935456 / 32, 967456 / 32, 999712 / 32, 1032224 / 32 |
| 101 | }; |
| 102 | |
| 103 | |
| 104 | /** Gain values of p(0) for long-term prediction. |
| 105 | * To be indexed by the Rice coded indices. |
| 106 | */ |
| 107 | static const uint8_t ltp_gain_values [4][4] = { |
| 108 | { 0, 8, 16, 24}, |
| 109 | {32, 40, 48, 56}, |
| 110 | {64, 70, 76, 82}, |
| 111 | {88, 92, 96, 100} |
| 112 | }; |
| 113 | |
| 114 | |
| 115 | /** Inter-channel weighting factors for multi-channel correlation. |
| 116 | * To be indexed by the Rice coded indices. |
| 117 | */ |
| 118 | static const int16_t mcc_weightings[] = { |
| 119 | 204, 192, 179, 166, 153, 140, 128, 115, |
| 120 | 102, 89, 76, 64, 51, 38, 25, 12, |
| 121 | 0, -12, -25, -38, -51, -64, -76, -89, |
| 122 | -102, -115, -128, -140, -153, -166, -179, -192 |
| 123 | }; |
| 124 | |
| 125 | |
| 126 | /** Tail codes used in arithmetic coding using block Gilbert-Moore codes. |
| 127 | */ |
| 128 | static const uint8_t tail_code[16][6] = { |
| 129 | { 74, 44, 25, 13, 7, 3}, |
| 130 | { 68, 42, 24, 13, 7, 3}, |
| 131 | { 58, 39, 23, 13, 7, 3}, |
| 132 | {126, 70, 37, 19, 10, 5}, |
| 133 | {132, 70, 37, 20, 10, 5}, |
| 134 | {124, 70, 38, 20, 10, 5}, |
| 135 | {120, 69, 37, 20, 11, 5}, |
| 136 | {116, 67, 37, 20, 11, 5}, |
| 137 | {108, 66, 36, 20, 10, 5}, |
| 138 | {102, 62, 36, 20, 10, 5}, |
| 139 | { 88, 58, 34, 19, 10, 5}, |
| 140 | {162, 89, 49, 25, 13, 7}, |
| 141 | {156, 87, 49, 26, 14, 7}, |
| 142 | {150, 86, 47, 26, 14, 7}, |
| 143 | {142, 84, 47, 26, 14, 7}, |
| 144 | {131, 79, 46, 26, 14, 7} |
| 145 | }; |
| 146 | |
| 147 | |
| 148 | enum RA_Flag { |
| 149 | RA_FLAG_NONE, |
| 150 | RA_FLAG_FRAMES, |
| 151 | RA_FLAG_HEADER |
| 152 | }; |
| 153 | |
| 154 | |
| 155 | typedef struct { |
| 156 | uint32_t samples; ///< number of samples, 0xFFFFFFFF if unknown |
| 157 | int resolution; ///< 000 = 8-bit; 001 = 16-bit; 010 = 24-bit; 011 = 32-bit |
| 158 | int floating; ///< 1 = IEEE 32-bit floating-point, 0 = integer |
| 159 | int msb_first; ///< 1 = original CRC calculated on big-endian system, 0 = little-endian |
| 160 | int frame_length; ///< frame length for each frame (last frame may differ) |
| 161 | int ra_distance; ///< distance between RA frames (in frames, 0...255) |
| 162 | enum RA_Flag ra_flag; ///< indicates where the size of ra units is stored |
| 163 | int adapt_order; ///< adaptive order: 1 = on, 0 = off |
| 164 | int coef_table; ///< table index of Rice code parameters |
| 165 | int long_term_prediction; ///< long term prediction (LTP): 1 = on, 0 = off |
| 166 | int max_order; ///< maximum prediction order (0..1023) |
| 167 | int block_switching; ///< number of block switching levels |
| 168 | int bgmc; ///< "Block Gilbert-Moore Code": 1 = on, 0 = off (Rice coding only) |
| 169 | int sb_part; ///< sub-block partition |
| 170 | int joint_stereo; ///< joint stereo: 1 = on, 0 = off |
| 171 | int mc_coding; ///< extended inter-channel coding (multi channel coding): 1 = on, 0 = off |
| 172 | int chan_config; ///< indicates that a chan_config_info field is present |
| 173 | int chan_sort; ///< channel rearrangement: 1 = on, 0 = off |
| 174 | int rlslms; ///< use "Recursive Least Square-Least Mean Square" predictor: 1 = on, 0 = off |
| 175 | int chan_config_info; ///< mapping of channels to loudspeaker locations. Unused until setting channel configuration is implemented. |
| 176 | int *chan_pos; ///< original channel positions |
| 177 | int crc_enabled; ///< enable Cyclic Redundancy Checksum |
| 178 | } ALSSpecificConfig; |
| 179 | |
| 180 | |
| 181 | typedef struct { |
| 182 | int stop_flag; |
| 183 | int master_channel; |
| 184 | int time_diff_flag; |
| 185 | int time_diff_sign; |
| 186 | int time_diff_index; |
| 187 | int weighting[6]; |
| 188 | } ALSChannelData; |
| 189 | |
| 190 | |
| 191 | typedef struct { |
| 192 | AVCodecContext *avctx; |
| 193 | ALSSpecificConfig sconf; |
| 194 | GetBitContext gb; |
| 195 | BswapDSPContext bdsp; |
| 196 | const AVCRC *crc_table; |
| 197 | uint32_t crc_org; ///< CRC value of the original input data |
| 198 | uint32_t crc; ///< CRC value calculated from decoded data |
| 199 | unsigned int cur_frame_length; ///< length of the current frame to decode |
| 200 | unsigned int frame_id; ///< the frame ID / number of the current frame |
| 201 | unsigned int js_switch; ///< if true, joint-stereo decoding is enforced |
| 202 | unsigned int cs_switch; ///< if true, channel rearrangement is done |
| 203 | unsigned int num_blocks; ///< number of blocks used in the current frame |
| 204 | unsigned int s_max; ///< maximum Rice parameter allowed in entropy coding |
| 205 | uint8_t *bgmc_lut; ///< pointer at lookup tables used for BGMC |
| 206 | int *bgmc_lut_status; ///< pointer at lookup table status flags used for BGMC |
| 207 | int ltp_lag_length; ///< number of bits used for ltp lag value |
| 208 | int *const_block; ///< contains const_block flags for all channels |
| 209 | unsigned int *shift_lsbs; ///< contains shift_lsbs flags for all channels |
| 210 | unsigned int *opt_order; ///< contains opt_order flags for all channels |
| 211 | int *store_prev_samples; ///< contains store_prev_samples flags for all channels |
| 212 | int *use_ltp; ///< contains use_ltp flags for all channels |
| 213 | int *ltp_lag; ///< contains ltp lag values for all channels |
| 214 | int **ltp_gain; ///< gain values for ltp 5-tap filter for a channel |
| 215 | int *ltp_gain_buffer; ///< contains all gain values for ltp 5-tap filter |
| 216 | int32_t **quant_cof; ///< quantized parcor coefficients for a channel |
| 217 | int32_t *quant_cof_buffer; ///< contains all quantized parcor coefficients |
| 218 | int32_t **lpc_cof; ///< coefficients of the direct form prediction filter for a channel |
| 219 | int32_t *lpc_cof_buffer; ///< contains all coefficients of the direct form prediction filter |
| 220 | int32_t *lpc_cof_reversed_buffer; ///< temporary buffer to set up a reversed versio of lpc_cof_buffer |
| 221 | ALSChannelData **chan_data; ///< channel data for multi-channel correlation |
| 222 | ALSChannelData *chan_data_buffer; ///< contains channel data for all channels |
| 223 | int *reverted_channels; ///< stores a flag for each reverted channel |
| 224 | int32_t *prev_raw_samples; ///< contains unshifted raw samples from the previous block |
| 225 | int32_t **raw_samples; ///< decoded raw samples for each channel |
| 226 | int32_t *raw_buffer; ///< contains all decoded raw samples including carryover samples |
| 227 | uint8_t *crc_buffer; ///< buffer of byte order corrected samples used for CRC check |
| 228 | } ALSDecContext; |
| 229 | |
| 230 | |
| 231 | typedef struct { |
| 232 | unsigned int block_length; ///< number of samples within the block |
| 233 | unsigned int ra_block; ///< if true, this is a random access block |
| 234 | int *const_block; ///< if true, this is a constant value block |
| 235 | int js_blocks; ///< true if this block contains a difference signal |
| 236 | unsigned int *shift_lsbs; ///< shift of values for this block |
| 237 | unsigned int *opt_order; ///< prediction order of this block |
| 238 | int *store_prev_samples;///< if true, carryover samples have to be stored |
| 239 | int *use_ltp; ///< if true, long-term prediction is used |
| 240 | int *ltp_lag; ///< lag value for long-term prediction |
| 241 | int *ltp_gain; ///< gain values for ltp 5-tap filter |
| 242 | int32_t *quant_cof; ///< quantized parcor coefficients |
| 243 | int32_t *lpc_cof; ///< coefficients of the direct form prediction |
| 244 | int32_t *raw_samples; ///< decoded raw samples / residuals for this block |
| 245 | int32_t *prev_raw_samples; ///< contains unshifted raw samples from the previous block |
| 246 | int32_t *raw_other; ///< decoded raw samples of the other channel of a channel pair |
| 247 | } ALSBlockData; |
| 248 | |
| 249 | |
| 250 | static av_cold void dprint_specific_config(ALSDecContext *ctx) |
| 251 | { |
| 252 | #ifdef DEBUG |
| 253 | AVCodecContext *avctx = ctx->avctx; |
| 254 | ALSSpecificConfig *sconf = &ctx->sconf; |
| 255 | |
| 256 | av_dlog(avctx, "resolution = %i\n", sconf->resolution); |
| 257 | av_dlog(avctx, "floating = %i\n", sconf->floating); |
| 258 | av_dlog(avctx, "frame_length = %i\n", sconf->frame_length); |
| 259 | av_dlog(avctx, "ra_distance = %i\n", sconf->ra_distance); |
| 260 | av_dlog(avctx, "ra_flag = %i\n", sconf->ra_flag); |
| 261 | av_dlog(avctx, "adapt_order = %i\n", sconf->adapt_order); |
| 262 | av_dlog(avctx, "coef_table = %i\n", sconf->coef_table); |
| 263 | av_dlog(avctx, "long_term_prediction = %i\n", sconf->long_term_prediction); |
| 264 | av_dlog(avctx, "max_order = %i\n", sconf->max_order); |
| 265 | av_dlog(avctx, "block_switching = %i\n", sconf->block_switching); |
| 266 | av_dlog(avctx, "bgmc = %i\n", sconf->bgmc); |
| 267 | av_dlog(avctx, "sb_part = %i\n", sconf->sb_part); |
| 268 | av_dlog(avctx, "joint_stereo = %i\n", sconf->joint_stereo); |
| 269 | av_dlog(avctx, "mc_coding = %i\n", sconf->mc_coding); |
| 270 | av_dlog(avctx, "chan_config = %i\n", sconf->chan_config); |
| 271 | av_dlog(avctx, "chan_sort = %i\n", sconf->chan_sort); |
| 272 | av_dlog(avctx, "RLSLMS = %i\n", sconf->rlslms); |
| 273 | av_dlog(avctx, "chan_config_info = %i\n", sconf->chan_config_info); |
| 274 | #endif |
| 275 | } |
| 276 | |
| 277 | |
| 278 | /** Read an ALSSpecificConfig from a buffer into the output struct. |
| 279 | */ |
| 280 | static av_cold int read_specific_config(ALSDecContext *ctx) |
| 281 | { |
| 282 | GetBitContext gb; |
| 283 | uint64_t ht_size; |
| 284 | int i, config_offset; |
| 285 | MPEG4AudioConfig m4ac = {0}; |
| 286 | ALSSpecificConfig *sconf = &ctx->sconf; |
| 287 | AVCodecContext *avctx = ctx->avctx; |
| 288 | uint32_t als_id, header_size, trailer_size; |
| 289 | int ret; |
| 290 | |
| 291 | if ((ret = init_get_bits8(&gb, avctx->extradata, avctx->extradata_size)) < 0) |
| 292 | return ret; |
| 293 | |
| 294 | config_offset = avpriv_mpeg4audio_get_config(&m4ac, avctx->extradata, |
| 295 | avctx->extradata_size * 8, 1); |
| 296 | |
| 297 | if (config_offset < 0) |
| 298 | return AVERROR_INVALIDDATA; |
| 299 | |
| 300 | skip_bits_long(&gb, config_offset); |
| 301 | |
| 302 | if (get_bits_left(&gb) < (30 << 3)) |
| 303 | return AVERROR_INVALIDDATA; |
| 304 | |
| 305 | // read the fixed items |
| 306 | als_id = get_bits_long(&gb, 32); |
| 307 | avctx->sample_rate = m4ac.sample_rate; |
| 308 | skip_bits_long(&gb, 32); // sample rate already known |
| 309 | sconf->samples = get_bits_long(&gb, 32); |
| 310 | avctx->channels = m4ac.channels; |
| 311 | skip_bits(&gb, 16); // number of channels already known |
| 312 | skip_bits(&gb, 3); // skip file_type |
| 313 | sconf->resolution = get_bits(&gb, 3); |
| 314 | sconf->floating = get_bits1(&gb); |
| 315 | sconf->msb_first = get_bits1(&gb); |
| 316 | sconf->frame_length = get_bits(&gb, 16) + 1; |
| 317 | sconf->ra_distance = get_bits(&gb, 8); |
| 318 | sconf->ra_flag = get_bits(&gb, 2); |
| 319 | sconf->adapt_order = get_bits1(&gb); |
| 320 | sconf->coef_table = get_bits(&gb, 2); |
| 321 | sconf->long_term_prediction = get_bits1(&gb); |
| 322 | sconf->max_order = get_bits(&gb, 10); |
| 323 | sconf->block_switching = get_bits(&gb, 2); |
| 324 | sconf->bgmc = get_bits1(&gb); |
| 325 | sconf->sb_part = get_bits1(&gb); |
| 326 | sconf->joint_stereo = get_bits1(&gb); |
| 327 | sconf->mc_coding = get_bits1(&gb); |
| 328 | sconf->chan_config = get_bits1(&gb); |
| 329 | sconf->chan_sort = get_bits1(&gb); |
| 330 | sconf->crc_enabled = get_bits1(&gb); |
| 331 | sconf->rlslms = get_bits1(&gb); |
| 332 | skip_bits(&gb, 5); // skip 5 reserved bits |
| 333 | skip_bits1(&gb); // skip aux_data_enabled |
| 334 | |
| 335 | |
| 336 | // check for ALSSpecificConfig struct |
| 337 | if (als_id != MKBETAG('A','L','S','\0')) |
| 338 | return AVERROR_INVALIDDATA; |
| 339 | |
| 340 | ctx->cur_frame_length = sconf->frame_length; |
| 341 | |
| 342 | // read channel config |
| 343 | if (sconf->chan_config) |
| 344 | sconf->chan_config_info = get_bits(&gb, 16); |
| 345 | // TODO: use this to set avctx->channel_layout |
| 346 | |
| 347 | |
| 348 | // read channel sorting |
| 349 | if (sconf->chan_sort && avctx->channels > 1) { |
| 350 | int chan_pos_bits = av_ceil_log2(avctx->channels); |
| 351 | int bits_needed = avctx->channels * chan_pos_bits + 7; |
| 352 | if (get_bits_left(&gb) < bits_needed) |
| 353 | return AVERROR_INVALIDDATA; |
| 354 | |
| 355 | if (!(sconf->chan_pos = av_malloc(avctx->channels * sizeof(*sconf->chan_pos)))) |
| 356 | return AVERROR(ENOMEM); |
| 357 | |
| 358 | ctx->cs_switch = 1; |
| 359 | |
| 360 | for (i = 0; i < avctx->channels; i++) { |
| 361 | int idx; |
| 362 | |
| 363 | idx = get_bits(&gb, chan_pos_bits); |
| 364 | if (idx >= avctx->channels) { |
| 365 | av_log(avctx, AV_LOG_WARNING, "Invalid channel reordering.\n"); |
| 366 | ctx->cs_switch = 0; |
| 367 | break; |
| 368 | } |
| 369 | sconf->chan_pos[idx] = i; |
| 370 | } |
| 371 | |
| 372 | align_get_bits(&gb); |
| 373 | } |
| 374 | |
| 375 | |
| 376 | // read fixed header and trailer sizes, |
| 377 | // if size = 0xFFFFFFFF then there is no data field! |
| 378 | if (get_bits_left(&gb) < 64) |
| 379 | return AVERROR_INVALIDDATA; |
| 380 | |
| 381 | header_size = get_bits_long(&gb, 32); |
| 382 | trailer_size = get_bits_long(&gb, 32); |
| 383 | if (header_size == 0xFFFFFFFF) |
| 384 | header_size = 0; |
| 385 | if (trailer_size == 0xFFFFFFFF) |
| 386 | trailer_size = 0; |
| 387 | |
| 388 | ht_size = ((int64_t)(header_size) + (int64_t)(trailer_size)) << 3; |
| 389 | |
| 390 | |
| 391 | // skip the header and trailer data |
| 392 | if (get_bits_left(&gb) < ht_size) |
| 393 | return AVERROR_INVALIDDATA; |
| 394 | |
| 395 | if (ht_size > INT32_MAX) |
| 396 | return AVERROR_PATCHWELCOME; |
| 397 | |
| 398 | skip_bits_long(&gb, ht_size); |
| 399 | |
| 400 | |
| 401 | // initialize CRC calculation |
| 402 | if (sconf->crc_enabled) { |
| 403 | if (get_bits_left(&gb) < 32) |
| 404 | return AVERROR_INVALIDDATA; |
| 405 | |
| 406 | if (avctx->err_recognition & (AV_EF_CRCCHECK|AV_EF_CAREFUL)) { |
| 407 | ctx->crc_table = av_crc_get_table(AV_CRC_32_IEEE_LE); |
| 408 | ctx->crc = 0xFFFFFFFF; |
| 409 | ctx->crc_org = ~get_bits_long(&gb, 32); |
| 410 | } else |
| 411 | skip_bits_long(&gb, 32); |
| 412 | } |
| 413 | |
| 414 | |
| 415 | // no need to read the rest of ALSSpecificConfig (ra_unit_size & aux data) |
| 416 | |
| 417 | dprint_specific_config(ctx); |
| 418 | |
| 419 | return 0; |
| 420 | } |
| 421 | |
| 422 | |
| 423 | /** Check the ALSSpecificConfig for unsupported features. |
| 424 | */ |
| 425 | static int check_specific_config(ALSDecContext *ctx) |
| 426 | { |
| 427 | ALSSpecificConfig *sconf = &ctx->sconf; |
| 428 | int error = 0; |
| 429 | |
| 430 | // report unsupported feature and set error value |
| 431 | #define MISSING_ERR(cond, str, errval) \ |
| 432 | { \ |
| 433 | if (cond) { \ |
| 434 | avpriv_report_missing_feature(ctx->avctx, \ |
| 435 | str); \ |
| 436 | error = errval; \ |
| 437 | } \ |
| 438 | } |
| 439 | |
| 440 | MISSING_ERR(sconf->floating, "Floating point decoding", AVERROR_PATCHWELCOME); |
| 441 | MISSING_ERR(sconf->rlslms, "Adaptive RLS-LMS prediction", AVERROR_PATCHWELCOME); |
| 442 | |
| 443 | return error; |
| 444 | } |
| 445 | |
| 446 | |
| 447 | /** Parse the bs_info field to extract the block partitioning used in |
| 448 | * block switching mode, refer to ISO/IEC 14496-3, section 11.6.2. |
| 449 | */ |
| 450 | static void parse_bs_info(const uint32_t bs_info, unsigned int n, |
| 451 | unsigned int div, unsigned int **div_blocks, |
| 452 | unsigned int *num_blocks) |
| 453 | { |
| 454 | if (n < 31 && ((bs_info << n) & 0x40000000)) { |
| 455 | // if the level is valid and the investigated bit n is set |
| 456 | // then recursively check both children at bits (2n+1) and (2n+2) |
| 457 | n *= 2; |
| 458 | div += 1; |
| 459 | parse_bs_info(bs_info, n + 1, div, div_blocks, num_blocks); |
| 460 | parse_bs_info(bs_info, n + 2, div, div_blocks, num_blocks); |
| 461 | } else { |
| 462 | // else the bit is not set or the last level has been reached |
| 463 | // (bit implicitly not set) |
| 464 | **div_blocks = div; |
| 465 | (*div_blocks)++; |
| 466 | (*num_blocks)++; |
| 467 | } |
| 468 | } |
| 469 | |
| 470 | |
| 471 | /** Read and decode a Rice codeword. |
| 472 | */ |
| 473 | static int32_t decode_rice(GetBitContext *gb, unsigned int k) |
| 474 | { |
| 475 | int max = get_bits_left(gb) - k; |
| 476 | int q = get_unary(gb, 0, max); |
| 477 | int r = k ? get_bits1(gb) : !(q & 1); |
| 478 | |
| 479 | if (k > 1) { |
| 480 | q <<= (k - 1); |
| 481 | q += get_bits_long(gb, k - 1); |
| 482 | } else if (!k) { |
| 483 | q >>= 1; |
| 484 | } |
| 485 | return r ? q : ~q; |
| 486 | } |
| 487 | |
| 488 | |
| 489 | /** Convert PARCOR coefficient k to direct filter coefficient. |
| 490 | */ |
| 491 | static void parcor_to_lpc(unsigned int k, const int32_t *par, int32_t *cof) |
| 492 | { |
| 493 | int i, j; |
| 494 | |
| 495 | for (i = 0, j = k - 1; i < j; i++, j--) { |
| 496 | int tmp1 = ((MUL64(par[k], cof[j]) + (1 << 19)) >> 20); |
| 497 | cof[j] += ((MUL64(par[k], cof[i]) + (1 << 19)) >> 20); |
| 498 | cof[i] += tmp1; |
| 499 | } |
| 500 | if (i == j) |
| 501 | cof[i] += ((MUL64(par[k], cof[j]) + (1 << 19)) >> 20); |
| 502 | |
| 503 | cof[k] = par[k]; |
| 504 | } |
| 505 | |
| 506 | |
| 507 | /** Read block switching field if necessary and set actual block sizes. |
| 508 | * Also assure that the block sizes of the last frame correspond to the |
| 509 | * actual number of samples. |
| 510 | */ |
| 511 | static void get_block_sizes(ALSDecContext *ctx, unsigned int *div_blocks, |
| 512 | uint32_t *bs_info) |
| 513 | { |
| 514 | ALSSpecificConfig *sconf = &ctx->sconf; |
| 515 | GetBitContext *gb = &ctx->gb; |
| 516 | unsigned int *ptr_div_blocks = div_blocks; |
| 517 | unsigned int b; |
| 518 | |
| 519 | if (sconf->block_switching) { |
| 520 | unsigned int bs_info_len = 1 << (sconf->block_switching + 2); |
| 521 | *bs_info = get_bits_long(gb, bs_info_len); |
| 522 | *bs_info <<= (32 - bs_info_len); |
| 523 | } |
| 524 | |
| 525 | ctx->num_blocks = 0; |
| 526 | parse_bs_info(*bs_info, 0, 0, &ptr_div_blocks, &ctx->num_blocks); |
| 527 | |
| 528 | // The last frame may have an overdetermined block structure given in |
| 529 | // the bitstream. In that case the defined block structure would need |
| 530 | // more samples than available to be consistent. |
| 531 | // The block structure is actually used but the block sizes are adapted |
| 532 | // to fit the actual number of available samples. |
| 533 | // Example: 5 samples, 2nd level block sizes: 2 2 2 2. |
| 534 | // This results in the actual block sizes: 2 2 1 0. |
| 535 | // This is not specified in 14496-3 but actually done by the reference |
| 536 | // codec RM22 revision 2. |
| 537 | // This appears to happen in case of an odd number of samples in the last |
| 538 | // frame which is actually not allowed by the block length switching part |
| 539 | // of 14496-3. |
| 540 | // The ALS conformance files feature an odd number of samples in the last |
| 541 | // frame. |
| 542 | |
| 543 | for (b = 0; b < ctx->num_blocks; b++) |
| 544 | div_blocks[b] = ctx->sconf.frame_length >> div_blocks[b]; |
| 545 | |
| 546 | if (ctx->cur_frame_length != ctx->sconf.frame_length) { |
| 547 | unsigned int remaining = ctx->cur_frame_length; |
| 548 | |
| 549 | for (b = 0; b < ctx->num_blocks; b++) { |
| 550 | if (remaining <= div_blocks[b]) { |
| 551 | div_blocks[b] = remaining; |
| 552 | ctx->num_blocks = b + 1; |
| 553 | break; |
| 554 | } |
| 555 | |
| 556 | remaining -= div_blocks[b]; |
| 557 | } |
| 558 | } |
| 559 | } |
| 560 | |
| 561 | |
| 562 | /** Read the block data for a constant block |
| 563 | */ |
| 564 | static int read_const_block_data(ALSDecContext *ctx, ALSBlockData *bd) |
| 565 | { |
| 566 | ALSSpecificConfig *sconf = &ctx->sconf; |
| 567 | AVCodecContext *avctx = ctx->avctx; |
| 568 | GetBitContext *gb = &ctx->gb; |
| 569 | |
| 570 | if (bd->block_length <= 0) |
| 571 | return AVERROR_INVALIDDATA; |
| 572 | |
| 573 | *bd->raw_samples = 0; |
| 574 | *bd->const_block = get_bits1(gb); // 1 = constant value, 0 = zero block (silence) |
| 575 | bd->js_blocks = get_bits1(gb); |
| 576 | |
| 577 | // skip 5 reserved bits |
| 578 | skip_bits(gb, 5); |
| 579 | |
| 580 | if (*bd->const_block) { |
| 581 | unsigned int const_val_bits = sconf->floating ? 24 : avctx->bits_per_raw_sample; |
| 582 | *bd->raw_samples = get_sbits_long(gb, const_val_bits); |
| 583 | } |
| 584 | |
| 585 | // ensure constant block decoding by reusing this field |
| 586 | *bd->const_block = 1; |
| 587 | |
| 588 | return 0; |
| 589 | } |
| 590 | |
| 591 | |
| 592 | /** Decode the block data for a constant block |
| 593 | */ |
| 594 | static void decode_const_block_data(ALSDecContext *ctx, ALSBlockData *bd) |
| 595 | { |
| 596 | int smp = bd->block_length - 1; |
| 597 | int32_t val = *bd->raw_samples; |
| 598 | int32_t *dst = bd->raw_samples + 1; |
| 599 | |
| 600 | // write raw samples into buffer |
| 601 | for (; smp; smp--) |
| 602 | *dst++ = val; |
| 603 | } |
| 604 | |
| 605 | |
| 606 | /** Read the block data for a non-constant block |
| 607 | */ |
| 608 | static int read_var_block_data(ALSDecContext *ctx, ALSBlockData *bd) |
| 609 | { |
| 610 | ALSSpecificConfig *sconf = &ctx->sconf; |
| 611 | AVCodecContext *avctx = ctx->avctx; |
| 612 | GetBitContext *gb = &ctx->gb; |
| 613 | unsigned int k; |
| 614 | unsigned int s[8]; |
| 615 | unsigned int sx[8]; |
| 616 | unsigned int sub_blocks, log2_sub_blocks, sb_length; |
| 617 | unsigned int start = 0; |
| 618 | unsigned int opt_order; |
| 619 | int sb; |
| 620 | int32_t *quant_cof = bd->quant_cof; |
| 621 | int32_t *current_res; |
| 622 | |
| 623 | |
| 624 | // ensure variable block decoding by reusing this field |
| 625 | *bd->const_block = 0; |
| 626 | |
| 627 | *bd->opt_order = 1; |
| 628 | bd->js_blocks = get_bits1(gb); |
| 629 | |
| 630 | opt_order = *bd->opt_order; |
| 631 | |
| 632 | // determine the number of subblocks for entropy decoding |
| 633 | if (!sconf->bgmc && !sconf->sb_part) { |
| 634 | log2_sub_blocks = 0; |
| 635 | } else { |
| 636 | if (sconf->bgmc && sconf->sb_part) |
| 637 | log2_sub_blocks = get_bits(gb, 2); |
| 638 | else |
| 639 | log2_sub_blocks = 2 * get_bits1(gb); |
| 640 | } |
| 641 | |
| 642 | sub_blocks = 1 << log2_sub_blocks; |
| 643 | |
| 644 | // do not continue in case of a damaged stream since |
| 645 | // block_length must be evenly divisible by sub_blocks |
| 646 | if (bd->block_length & (sub_blocks - 1)) { |
| 647 | av_log(avctx, AV_LOG_WARNING, |
| 648 | "Block length is not evenly divisible by the number of subblocks.\n"); |
| 649 | return AVERROR_INVALIDDATA; |
| 650 | } |
| 651 | |
| 652 | sb_length = bd->block_length >> log2_sub_blocks; |
| 653 | |
| 654 | if (sconf->bgmc) { |
| 655 | s[0] = get_bits(gb, 8 + (sconf->resolution > 1)); |
| 656 | for (k = 1; k < sub_blocks; k++) |
| 657 | s[k] = s[k - 1] + decode_rice(gb, 2); |
| 658 | |
| 659 | for (k = 0; k < sub_blocks; k++) { |
| 660 | sx[k] = s[k] & 0x0F; |
| 661 | s [k] >>= 4; |
| 662 | } |
| 663 | } else { |
| 664 | s[0] = get_bits(gb, 4 + (sconf->resolution > 1)); |
| 665 | for (k = 1; k < sub_blocks; k++) |
| 666 | s[k] = s[k - 1] + decode_rice(gb, 0); |
| 667 | } |
| 668 | for (k = 1; k < sub_blocks; k++) |
| 669 | if (s[k] > 32) { |
| 670 | av_log(avctx, AV_LOG_ERROR, "k invalid for rice code.\n"); |
| 671 | return AVERROR_INVALIDDATA; |
| 672 | } |
| 673 | |
| 674 | if (get_bits1(gb)) |
| 675 | *bd->shift_lsbs = get_bits(gb, 4) + 1; |
| 676 | |
| 677 | *bd->store_prev_samples = (bd->js_blocks && bd->raw_other) || *bd->shift_lsbs; |
| 678 | |
| 679 | |
| 680 | if (!sconf->rlslms) { |
| 681 | if (sconf->adapt_order) { |
| 682 | int opt_order_length = av_ceil_log2(av_clip((bd->block_length >> 3) - 1, |
| 683 | 2, sconf->max_order + 1)); |
| 684 | *bd->opt_order = get_bits(gb, opt_order_length); |
| 685 | if (*bd->opt_order > sconf->max_order) { |
| 686 | *bd->opt_order = sconf->max_order; |
| 687 | av_log(avctx, AV_LOG_ERROR, "Predictor order too large.\n"); |
| 688 | return AVERROR_INVALIDDATA; |
| 689 | } |
| 690 | } else { |
| 691 | *bd->opt_order = sconf->max_order; |
| 692 | } |
| 693 | if (*bd->opt_order > bd->block_length) { |
| 694 | *bd->opt_order = bd->block_length; |
| 695 | av_log(avctx, AV_LOG_ERROR, "Predictor order too large.\n"); |
| 696 | return AVERROR_INVALIDDATA; |
| 697 | } |
| 698 | opt_order = *bd->opt_order; |
| 699 | |
| 700 | if (opt_order) { |
| 701 | int add_base; |
| 702 | |
| 703 | if (sconf->coef_table == 3) { |
| 704 | add_base = 0x7F; |
| 705 | |
| 706 | // read coefficient 0 |
| 707 | quant_cof[0] = 32 * parcor_scaled_values[get_bits(gb, 7)]; |
| 708 | |
| 709 | // read coefficient 1 |
| 710 | if (opt_order > 1) |
| 711 | quant_cof[1] = -32 * parcor_scaled_values[get_bits(gb, 7)]; |
| 712 | |
| 713 | // read coefficients 2 to opt_order |
| 714 | for (k = 2; k < opt_order; k++) |
| 715 | quant_cof[k] = get_bits(gb, 7); |
| 716 | } else { |
| 717 | int k_max; |
| 718 | add_base = 1; |
| 719 | |
| 720 | // read coefficient 0 to 19 |
| 721 | k_max = FFMIN(opt_order, 20); |
| 722 | for (k = 0; k < k_max; k++) { |
| 723 | int rice_param = parcor_rice_table[sconf->coef_table][k][1]; |
| 724 | int offset = parcor_rice_table[sconf->coef_table][k][0]; |
| 725 | quant_cof[k] = decode_rice(gb, rice_param) + offset; |
| 726 | if (quant_cof[k] < -64 || quant_cof[k] > 63) { |
| 727 | av_log(avctx, AV_LOG_ERROR, |
| 728 | "quant_cof %"PRIu32" is out of range.\n", |
| 729 | quant_cof[k]); |
| 730 | return AVERROR_INVALIDDATA; |
| 731 | } |
| 732 | } |
| 733 | |
| 734 | // read coefficients 20 to 126 |
| 735 | k_max = FFMIN(opt_order, 127); |
| 736 | for (; k < k_max; k++) |
| 737 | quant_cof[k] = decode_rice(gb, 2) + (k & 1); |
| 738 | |
| 739 | // read coefficients 127 to opt_order |
| 740 | for (; k < opt_order; k++) |
| 741 | quant_cof[k] = decode_rice(gb, 1); |
| 742 | |
| 743 | quant_cof[0] = 32 * parcor_scaled_values[quant_cof[0] + 64]; |
| 744 | |
| 745 | if (opt_order > 1) |
| 746 | quant_cof[1] = -32 * parcor_scaled_values[quant_cof[1] + 64]; |
| 747 | } |
| 748 | |
| 749 | for (k = 2; k < opt_order; k++) |
| 750 | quant_cof[k] = (quant_cof[k] << 14) + (add_base << 13); |
| 751 | } |
| 752 | } |
| 753 | |
| 754 | // read LTP gain and lag values |
| 755 | if (sconf->long_term_prediction) { |
| 756 | *bd->use_ltp = get_bits1(gb); |
| 757 | |
| 758 | if (*bd->use_ltp) { |
| 759 | int r, c; |
| 760 | |
| 761 | bd->ltp_gain[0] = decode_rice(gb, 1) << 3; |
| 762 | bd->ltp_gain[1] = decode_rice(gb, 2) << 3; |
| 763 | |
| 764 | r = get_unary(gb, 0, 3); |
| 765 | c = get_bits(gb, 2); |
| 766 | bd->ltp_gain[2] = ltp_gain_values[r][c]; |
| 767 | |
| 768 | bd->ltp_gain[3] = decode_rice(gb, 2) << 3; |
| 769 | bd->ltp_gain[4] = decode_rice(gb, 1) << 3; |
| 770 | |
| 771 | *bd->ltp_lag = get_bits(gb, ctx->ltp_lag_length); |
| 772 | *bd->ltp_lag += FFMAX(4, opt_order + 1); |
| 773 | } |
| 774 | } |
| 775 | |
| 776 | // read first value and residuals in case of a random access block |
| 777 | if (bd->ra_block) { |
| 778 | if (opt_order) |
| 779 | bd->raw_samples[0] = decode_rice(gb, avctx->bits_per_raw_sample - 4); |
| 780 | if (opt_order > 1) |
| 781 | bd->raw_samples[1] = decode_rice(gb, FFMIN(s[0] + 3, ctx->s_max)); |
| 782 | if (opt_order > 2) |
| 783 | bd->raw_samples[2] = decode_rice(gb, FFMIN(s[0] + 1, ctx->s_max)); |
| 784 | |
| 785 | start = FFMIN(opt_order, 3); |
| 786 | } |
| 787 | |
| 788 | // read all residuals |
| 789 | if (sconf->bgmc) { |
| 790 | int delta[8]; |
| 791 | unsigned int k [8]; |
| 792 | unsigned int b = av_clip((av_ceil_log2(bd->block_length) - 3) >> 1, 0, 5); |
| 793 | |
| 794 | // read most significant bits |
| 795 | unsigned int high; |
| 796 | unsigned int low; |
| 797 | unsigned int value; |
| 798 | |
| 799 | ff_bgmc_decode_init(gb, &high, &low, &value); |
| 800 | |
| 801 | current_res = bd->raw_samples + start; |
| 802 | |
| 803 | for (sb = 0; sb < sub_blocks; sb++) { |
| 804 | unsigned int sb_len = sb_length - (sb ? 0 : start); |
| 805 | |
| 806 | k [sb] = s[sb] > b ? s[sb] - b : 0; |
| 807 | delta[sb] = 5 - s[sb] + k[sb]; |
| 808 | |
| 809 | ff_bgmc_decode(gb, sb_len, current_res, |
| 810 | delta[sb], sx[sb], &high, &low, &value, ctx->bgmc_lut, ctx->bgmc_lut_status); |
| 811 | |
| 812 | current_res += sb_len; |
| 813 | } |
| 814 | |
| 815 | ff_bgmc_decode_end(gb); |
| 816 | |
| 817 | |
| 818 | // read least significant bits and tails |
| 819 | current_res = bd->raw_samples + start; |
| 820 | |
| 821 | for (sb = 0; sb < sub_blocks; sb++, start = 0) { |
| 822 | unsigned int cur_tail_code = tail_code[sx[sb]][delta[sb]]; |
| 823 | unsigned int cur_k = k[sb]; |
| 824 | unsigned int cur_s = s[sb]; |
| 825 | |
| 826 | for (; start < sb_length; start++) { |
| 827 | int32_t res = *current_res; |
| 828 | |
| 829 | if (res == cur_tail_code) { |
| 830 | unsigned int max_msb = (2 + (sx[sb] > 2) + (sx[sb] > 10)) |
| 831 | << (5 - delta[sb]); |
| 832 | |
| 833 | res = decode_rice(gb, cur_s); |
| 834 | |
| 835 | if (res >= 0) { |
| 836 | res += (max_msb ) << cur_k; |
| 837 | } else { |
| 838 | res -= (max_msb - 1) << cur_k; |
| 839 | } |
| 840 | } else { |
| 841 | if (res > cur_tail_code) |
| 842 | res--; |
| 843 | |
| 844 | if (res & 1) |
| 845 | res = -res; |
| 846 | |
| 847 | res >>= 1; |
| 848 | |
| 849 | if (cur_k) { |
| 850 | res <<= cur_k; |
| 851 | res |= get_bits_long(gb, cur_k); |
| 852 | } |
| 853 | } |
| 854 | |
| 855 | *current_res++ = res; |
| 856 | } |
| 857 | } |
| 858 | } else { |
| 859 | current_res = bd->raw_samples + start; |
| 860 | |
| 861 | for (sb = 0; sb < sub_blocks; sb++, start = 0) |
| 862 | for (; start < sb_length; start++) |
| 863 | *current_res++ = decode_rice(gb, s[sb]); |
| 864 | } |
| 865 | |
| 866 | if (!sconf->mc_coding || ctx->js_switch) |
| 867 | align_get_bits(gb); |
| 868 | |
| 869 | return 0; |
| 870 | } |
| 871 | |
| 872 | |
| 873 | /** Decode the block data for a non-constant block |
| 874 | */ |
| 875 | static int decode_var_block_data(ALSDecContext *ctx, ALSBlockData *bd) |
| 876 | { |
| 877 | ALSSpecificConfig *sconf = &ctx->sconf; |
| 878 | unsigned int block_length = bd->block_length; |
| 879 | unsigned int smp = 0; |
| 880 | unsigned int k; |
| 881 | int opt_order = *bd->opt_order; |
| 882 | int sb; |
| 883 | int64_t y; |
| 884 | int32_t *quant_cof = bd->quant_cof; |
| 885 | int32_t *lpc_cof = bd->lpc_cof; |
| 886 | int32_t *raw_samples = bd->raw_samples; |
| 887 | int32_t *raw_samples_end = bd->raw_samples + bd->block_length; |
| 888 | int32_t *lpc_cof_reversed = ctx->lpc_cof_reversed_buffer; |
| 889 | |
| 890 | // reverse long-term prediction |
| 891 | if (*bd->use_ltp) { |
| 892 | int ltp_smp; |
| 893 | |
| 894 | for (ltp_smp = FFMAX(*bd->ltp_lag - 2, 0); ltp_smp < block_length; ltp_smp++) { |
| 895 | int center = ltp_smp - *bd->ltp_lag; |
| 896 | int begin = FFMAX(0, center - 2); |
| 897 | int end = center + 3; |
| 898 | int tab = 5 - (end - begin); |
| 899 | int base; |
| 900 | |
| 901 | y = 1 << 6; |
| 902 | |
| 903 | for (base = begin; base < end; base++, tab++) |
| 904 | y += MUL64(bd->ltp_gain[tab], raw_samples[base]); |
| 905 | |
| 906 | raw_samples[ltp_smp] += y >> 7; |
| 907 | } |
| 908 | } |
| 909 | |
| 910 | // reconstruct all samples from residuals |
| 911 | if (bd->ra_block) { |
| 912 | for (smp = 0; smp < opt_order; smp++) { |
| 913 | y = 1 << 19; |
| 914 | |
| 915 | for (sb = 0; sb < smp; sb++) |
| 916 | y += MUL64(lpc_cof[sb], raw_samples[-(sb + 1)]); |
| 917 | |
| 918 | *raw_samples++ -= y >> 20; |
| 919 | parcor_to_lpc(smp, quant_cof, lpc_cof); |
| 920 | } |
| 921 | } else { |
| 922 | for (k = 0; k < opt_order; k++) |
| 923 | parcor_to_lpc(k, quant_cof, lpc_cof); |
| 924 | |
| 925 | // store previous samples in case that they have to be altered |
| 926 | if (*bd->store_prev_samples) |
| 927 | memcpy(bd->prev_raw_samples, raw_samples - sconf->max_order, |
| 928 | sizeof(*bd->prev_raw_samples) * sconf->max_order); |
| 929 | |
| 930 | // reconstruct difference signal for prediction (joint-stereo) |
| 931 | if (bd->js_blocks && bd->raw_other) { |
| 932 | int32_t *left, *right; |
| 933 | |
| 934 | if (bd->raw_other > raw_samples) { // D = R - L |
| 935 | left = raw_samples; |
| 936 | right = bd->raw_other; |
| 937 | } else { // D = R - L |
| 938 | left = bd->raw_other; |
| 939 | right = raw_samples; |
| 940 | } |
| 941 | |
| 942 | for (sb = -1; sb >= -sconf->max_order; sb--) |
| 943 | raw_samples[sb] = right[sb] - left[sb]; |
| 944 | } |
| 945 | |
| 946 | // reconstruct shifted signal |
| 947 | if (*bd->shift_lsbs) |
| 948 | for (sb = -1; sb >= -sconf->max_order; sb--) |
| 949 | raw_samples[sb] >>= *bd->shift_lsbs; |
| 950 | } |
| 951 | |
| 952 | // reverse linear prediction coefficients for efficiency |
| 953 | lpc_cof = lpc_cof + opt_order; |
| 954 | |
| 955 | for (sb = 0; sb < opt_order; sb++) |
| 956 | lpc_cof_reversed[sb] = lpc_cof[-(sb + 1)]; |
| 957 | |
| 958 | // reconstruct raw samples |
| 959 | raw_samples = bd->raw_samples + smp; |
| 960 | lpc_cof = lpc_cof_reversed + opt_order; |
| 961 | |
| 962 | for (; raw_samples < raw_samples_end; raw_samples++) { |
| 963 | y = 1 << 19; |
| 964 | |
| 965 | for (sb = -opt_order; sb < 0; sb++) |
| 966 | y += MUL64(lpc_cof[sb], raw_samples[sb]); |
| 967 | |
| 968 | *raw_samples -= y >> 20; |
| 969 | } |
| 970 | |
| 971 | raw_samples = bd->raw_samples; |
| 972 | |
| 973 | // restore previous samples in case that they have been altered |
| 974 | if (*bd->store_prev_samples) |
| 975 | memcpy(raw_samples - sconf->max_order, bd->prev_raw_samples, |
| 976 | sizeof(*raw_samples) * sconf->max_order); |
| 977 | |
| 978 | return 0; |
| 979 | } |
| 980 | |
| 981 | |
| 982 | /** Read the block data. |
| 983 | */ |
| 984 | static int read_block(ALSDecContext *ctx, ALSBlockData *bd) |
| 985 | { |
| 986 | int ret; |
| 987 | GetBitContext *gb = &ctx->gb; |
| 988 | |
| 989 | *bd->shift_lsbs = 0; |
| 990 | // read block type flag and read the samples accordingly |
| 991 | if (get_bits1(gb)) { |
| 992 | ret = read_var_block_data(ctx, bd); |
| 993 | } else { |
| 994 | ret = read_const_block_data(ctx, bd); |
| 995 | } |
| 996 | |
| 997 | return ret; |
| 998 | } |
| 999 | |
| 1000 | |
| 1001 | /** Decode the block data. |
| 1002 | */ |
| 1003 | static int decode_block(ALSDecContext *ctx, ALSBlockData *bd) |
| 1004 | { |
| 1005 | unsigned int smp; |
| 1006 | int ret = 0; |
| 1007 | |
| 1008 | // read block type flag and read the samples accordingly |
| 1009 | if (*bd->const_block) |
| 1010 | decode_const_block_data(ctx, bd); |
| 1011 | else |
| 1012 | ret = decode_var_block_data(ctx, bd); // always return 0 |
| 1013 | |
| 1014 | if (ret < 0) |
| 1015 | return ret; |
| 1016 | |
| 1017 | // TODO: read RLSLMS extension data |
| 1018 | |
| 1019 | if (*bd->shift_lsbs) |
| 1020 | for (smp = 0; smp < bd->block_length; smp++) |
| 1021 | bd->raw_samples[smp] <<= *bd->shift_lsbs; |
| 1022 | |
| 1023 | return 0; |
| 1024 | } |
| 1025 | |
| 1026 | |
| 1027 | /** Read and decode block data successively. |
| 1028 | */ |
| 1029 | static int read_decode_block(ALSDecContext *ctx, ALSBlockData *bd) |
| 1030 | { |
| 1031 | int ret; |
| 1032 | |
| 1033 | if ((ret = read_block(ctx, bd)) < 0) |
| 1034 | return ret; |
| 1035 | |
| 1036 | return decode_block(ctx, bd); |
| 1037 | } |
| 1038 | |
| 1039 | |
| 1040 | /** Compute the number of samples left to decode for the current frame and |
| 1041 | * sets these samples to zero. |
| 1042 | */ |
| 1043 | static void zero_remaining(unsigned int b, unsigned int b_max, |
| 1044 | const unsigned int *div_blocks, int32_t *buf) |
| 1045 | { |
| 1046 | unsigned int count = 0; |
| 1047 | |
| 1048 | while (b < b_max) |
| 1049 | count += div_blocks[b++]; |
| 1050 | |
| 1051 | if (count) |
| 1052 | memset(buf, 0, sizeof(*buf) * count); |
| 1053 | } |
| 1054 | |
| 1055 | |
| 1056 | /** Decode blocks independently. |
| 1057 | */ |
| 1058 | static int decode_blocks_ind(ALSDecContext *ctx, unsigned int ra_frame, |
| 1059 | unsigned int c, const unsigned int *div_blocks, |
| 1060 | unsigned int *js_blocks) |
| 1061 | { |
| 1062 | int ret; |
| 1063 | unsigned int b; |
| 1064 | ALSBlockData bd = { 0 }; |
| 1065 | |
| 1066 | bd.ra_block = ra_frame; |
| 1067 | bd.const_block = ctx->const_block; |
| 1068 | bd.shift_lsbs = ctx->shift_lsbs; |
| 1069 | bd.opt_order = ctx->opt_order; |
| 1070 | bd.store_prev_samples = ctx->store_prev_samples; |
| 1071 | bd.use_ltp = ctx->use_ltp; |
| 1072 | bd.ltp_lag = ctx->ltp_lag; |
| 1073 | bd.ltp_gain = ctx->ltp_gain[0]; |
| 1074 | bd.quant_cof = ctx->quant_cof[0]; |
| 1075 | bd.lpc_cof = ctx->lpc_cof[0]; |
| 1076 | bd.prev_raw_samples = ctx->prev_raw_samples; |
| 1077 | bd.raw_samples = ctx->raw_samples[c]; |
| 1078 | |
| 1079 | |
| 1080 | for (b = 0; b < ctx->num_blocks; b++) { |
| 1081 | bd.block_length = div_blocks[b]; |
| 1082 | |
| 1083 | if ((ret = read_decode_block(ctx, &bd)) < 0) { |
| 1084 | // damaged block, write zero for the rest of the frame |
| 1085 | zero_remaining(b, ctx->num_blocks, div_blocks, bd.raw_samples); |
| 1086 | return ret; |
| 1087 | } |
| 1088 | bd.raw_samples += div_blocks[b]; |
| 1089 | bd.ra_block = 0; |
| 1090 | } |
| 1091 | |
| 1092 | return 0; |
| 1093 | } |
| 1094 | |
| 1095 | |
| 1096 | /** Decode blocks dependently. |
| 1097 | */ |
| 1098 | static int decode_blocks(ALSDecContext *ctx, unsigned int ra_frame, |
| 1099 | unsigned int c, const unsigned int *div_blocks, |
| 1100 | unsigned int *js_blocks) |
| 1101 | { |
| 1102 | ALSSpecificConfig *sconf = &ctx->sconf; |
| 1103 | unsigned int offset = 0; |
| 1104 | unsigned int b; |
| 1105 | int ret; |
| 1106 | ALSBlockData bd[2] = { { 0 } }; |
| 1107 | |
| 1108 | bd[0].ra_block = ra_frame; |
| 1109 | bd[0].const_block = ctx->const_block; |
| 1110 | bd[0].shift_lsbs = ctx->shift_lsbs; |
| 1111 | bd[0].opt_order = ctx->opt_order; |
| 1112 | bd[0].store_prev_samples = ctx->store_prev_samples; |
| 1113 | bd[0].use_ltp = ctx->use_ltp; |
| 1114 | bd[0].ltp_lag = ctx->ltp_lag; |
| 1115 | bd[0].ltp_gain = ctx->ltp_gain[0]; |
| 1116 | bd[0].quant_cof = ctx->quant_cof[0]; |
| 1117 | bd[0].lpc_cof = ctx->lpc_cof[0]; |
| 1118 | bd[0].prev_raw_samples = ctx->prev_raw_samples; |
| 1119 | bd[0].js_blocks = *js_blocks; |
| 1120 | |
| 1121 | bd[1].ra_block = ra_frame; |
| 1122 | bd[1].const_block = ctx->const_block; |
| 1123 | bd[1].shift_lsbs = ctx->shift_lsbs; |
| 1124 | bd[1].opt_order = ctx->opt_order; |
| 1125 | bd[1].store_prev_samples = ctx->store_prev_samples; |
| 1126 | bd[1].use_ltp = ctx->use_ltp; |
| 1127 | bd[1].ltp_lag = ctx->ltp_lag; |
| 1128 | bd[1].ltp_gain = ctx->ltp_gain[0]; |
| 1129 | bd[1].quant_cof = ctx->quant_cof[0]; |
| 1130 | bd[1].lpc_cof = ctx->lpc_cof[0]; |
| 1131 | bd[1].prev_raw_samples = ctx->prev_raw_samples; |
| 1132 | bd[1].js_blocks = *(js_blocks + 1); |
| 1133 | |
| 1134 | // decode all blocks |
| 1135 | for (b = 0; b < ctx->num_blocks; b++) { |
| 1136 | unsigned int s; |
| 1137 | |
| 1138 | bd[0].block_length = div_blocks[b]; |
| 1139 | bd[1].block_length = div_blocks[b]; |
| 1140 | |
| 1141 | bd[0].raw_samples = ctx->raw_samples[c ] + offset; |
| 1142 | bd[1].raw_samples = ctx->raw_samples[c + 1] + offset; |
| 1143 | |
| 1144 | bd[0].raw_other = bd[1].raw_samples; |
| 1145 | bd[1].raw_other = bd[0].raw_samples; |
| 1146 | |
| 1147 | if ((ret = read_decode_block(ctx, &bd[0])) < 0 || |
| 1148 | (ret = read_decode_block(ctx, &bd[1])) < 0) |
| 1149 | goto fail; |
| 1150 | |
| 1151 | // reconstruct joint-stereo blocks |
| 1152 | if (bd[0].js_blocks) { |
| 1153 | if (bd[1].js_blocks) |
| 1154 | av_log(ctx->avctx, AV_LOG_WARNING, "Invalid channel pair.\n"); |
| 1155 | |
| 1156 | for (s = 0; s < div_blocks[b]; s++) |
| 1157 | bd[0].raw_samples[s] = bd[1].raw_samples[s] - bd[0].raw_samples[s]; |
| 1158 | } else if (bd[1].js_blocks) { |
| 1159 | for (s = 0; s < div_blocks[b]; s++) |
| 1160 | bd[1].raw_samples[s] = bd[1].raw_samples[s] + bd[0].raw_samples[s]; |
| 1161 | } |
| 1162 | |
| 1163 | offset += div_blocks[b]; |
| 1164 | bd[0].ra_block = 0; |
| 1165 | bd[1].ra_block = 0; |
| 1166 | } |
| 1167 | |
| 1168 | // store carryover raw samples, |
| 1169 | // the others channel raw samples are stored by the calling function. |
| 1170 | memmove(ctx->raw_samples[c] - sconf->max_order, |
| 1171 | ctx->raw_samples[c] - sconf->max_order + sconf->frame_length, |
| 1172 | sizeof(*ctx->raw_samples[c]) * sconf->max_order); |
| 1173 | |
| 1174 | return 0; |
| 1175 | fail: |
| 1176 | // damaged block, write zero for the rest of the frame |
| 1177 | zero_remaining(b, ctx->num_blocks, div_blocks, bd[0].raw_samples); |
| 1178 | zero_remaining(b, ctx->num_blocks, div_blocks, bd[1].raw_samples); |
| 1179 | return ret; |
| 1180 | } |
| 1181 | |
| 1182 | static inline int als_weighting(GetBitContext *gb, int k, int off) |
| 1183 | { |
| 1184 | int idx = av_clip(decode_rice(gb, k) + off, |
| 1185 | 0, FF_ARRAY_ELEMS(mcc_weightings) - 1); |
| 1186 | return mcc_weightings[idx]; |
| 1187 | } |
| 1188 | |
| 1189 | /** Read the channel data. |
| 1190 | */ |
| 1191 | static int read_channel_data(ALSDecContext *ctx, ALSChannelData *cd, int c) |
| 1192 | { |
| 1193 | GetBitContext *gb = &ctx->gb; |
| 1194 | ALSChannelData *current = cd; |
| 1195 | unsigned int channels = ctx->avctx->channels; |
| 1196 | int entries = 0; |
| 1197 | |
| 1198 | while (entries < channels && !(current->stop_flag = get_bits1(gb))) { |
| 1199 | current->master_channel = get_bits_long(gb, av_ceil_log2(channels)); |
| 1200 | |
| 1201 | if (current->master_channel >= channels) { |
| 1202 | av_log(ctx->avctx, AV_LOG_ERROR, "Invalid master channel.\n"); |
| 1203 | return AVERROR_INVALIDDATA; |
| 1204 | } |
| 1205 | |
| 1206 | if (current->master_channel != c) { |
| 1207 | current->time_diff_flag = get_bits1(gb); |
| 1208 | current->weighting[0] = als_weighting(gb, 1, 16); |
| 1209 | current->weighting[1] = als_weighting(gb, 2, 14); |
| 1210 | current->weighting[2] = als_weighting(gb, 1, 16); |
| 1211 | |
| 1212 | if (current->time_diff_flag) { |
| 1213 | current->weighting[3] = als_weighting(gb, 1, 16); |
| 1214 | current->weighting[4] = als_weighting(gb, 1, 16); |
| 1215 | current->weighting[5] = als_weighting(gb, 1, 16); |
| 1216 | |
| 1217 | current->time_diff_sign = get_bits1(gb); |
| 1218 | current->time_diff_index = get_bits(gb, ctx->ltp_lag_length - 3) + 3; |
| 1219 | } |
| 1220 | } |
| 1221 | |
| 1222 | current++; |
| 1223 | entries++; |
| 1224 | } |
| 1225 | |
| 1226 | if (entries == channels) { |
| 1227 | av_log(ctx->avctx, AV_LOG_ERROR, "Damaged channel data.\n"); |
| 1228 | return AVERROR_INVALIDDATA; |
| 1229 | } |
| 1230 | |
| 1231 | align_get_bits(gb); |
| 1232 | return 0; |
| 1233 | } |
| 1234 | |
| 1235 | |
| 1236 | /** Recursively reverts the inter-channel correlation for a block. |
| 1237 | */ |
| 1238 | static int revert_channel_correlation(ALSDecContext *ctx, ALSBlockData *bd, |
| 1239 | ALSChannelData **cd, int *reverted, |
| 1240 | unsigned int offset, int c) |
| 1241 | { |
| 1242 | ALSChannelData *ch = cd[c]; |
| 1243 | unsigned int dep = 0; |
| 1244 | unsigned int channels = ctx->avctx->channels; |
| 1245 | |
| 1246 | if (reverted[c]) |
| 1247 | return 0; |
| 1248 | |
| 1249 | reverted[c] = 1; |
| 1250 | |
| 1251 | while (dep < channels && !ch[dep].stop_flag) { |
| 1252 | revert_channel_correlation(ctx, bd, cd, reverted, offset, |
| 1253 | ch[dep].master_channel); |
| 1254 | |
| 1255 | dep++; |
| 1256 | } |
| 1257 | |
| 1258 | if (dep == channels) { |
| 1259 | av_log(ctx->avctx, AV_LOG_WARNING, "Invalid channel correlation.\n"); |
| 1260 | return AVERROR_INVALIDDATA; |
| 1261 | } |
| 1262 | |
| 1263 | bd->const_block = ctx->const_block + c; |
| 1264 | bd->shift_lsbs = ctx->shift_lsbs + c; |
| 1265 | bd->opt_order = ctx->opt_order + c; |
| 1266 | bd->store_prev_samples = ctx->store_prev_samples + c; |
| 1267 | bd->use_ltp = ctx->use_ltp + c; |
| 1268 | bd->ltp_lag = ctx->ltp_lag + c; |
| 1269 | bd->ltp_gain = ctx->ltp_gain[c]; |
| 1270 | bd->lpc_cof = ctx->lpc_cof[c]; |
| 1271 | bd->quant_cof = ctx->quant_cof[c]; |
| 1272 | bd->raw_samples = ctx->raw_samples[c] + offset; |
| 1273 | |
| 1274 | for (dep = 0; !ch[dep].stop_flag; dep++) { |
| 1275 | unsigned int smp; |
| 1276 | unsigned int begin = 1; |
| 1277 | unsigned int end = bd->block_length - 1; |
| 1278 | int64_t y; |
| 1279 | int32_t *master = ctx->raw_samples[ch[dep].master_channel] + offset; |
| 1280 | |
| 1281 | if (ch[dep].master_channel == c) |
| 1282 | continue; |
| 1283 | |
| 1284 | if (ch[dep].time_diff_flag) { |
| 1285 | int t = ch[dep].time_diff_index; |
| 1286 | |
| 1287 | if (ch[dep].time_diff_sign) { |
| 1288 | t = -t; |
| 1289 | begin -= t; |
| 1290 | } else { |
| 1291 | end -= t; |
| 1292 | } |
| 1293 | |
| 1294 | for (smp = begin; smp < end; smp++) { |
| 1295 | y = (1 << 6) + |
| 1296 | MUL64(ch[dep].weighting[0], master[smp - 1 ]) + |
| 1297 | MUL64(ch[dep].weighting[1], master[smp ]) + |
| 1298 | MUL64(ch[dep].weighting[2], master[smp + 1 ]) + |
| 1299 | MUL64(ch[dep].weighting[3], master[smp - 1 + t]) + |
| 1300 | MUL64(ch[dep].weighting[4], master[smp + t]) + |
| 1301 | MUL64(ch[dep].weighting[5], master[smp + 1 + t]); |
| 1302 | |
| 1303 | bd->raw_samples[smp] += y >> 7; |
| 1304 | } |
| 1305 | } else { |
| 1306 | for (smp = begin; smp < end; smp++) { |
| 1307 | y = (1 << 6) + |
| 1308 | MUL64(ch[dep].weighting[0], master[smp - 1]) + |
| 1309 | MUL64(ch[dep].weighting[1], master[smp ]) + |
| 1310 | MUL64(ch[dep].weighting[2], master[smp + 1]); |
| 1311 | |
| 1312 | bd->raw_samples[smp] += y >> 7; |
| 1313 | } |
| 1314 | } |
| 1315 | } |
| 1316 | |
| 1317 | return 0; |
| 1318 | } |
| 1319 | |
| 1320 | |
| 1321 | /** Read the frame data. |
| 1322 | */ |
| 1323 | static int read_frame_data(ALSDecContext *ctx, unsigned int ra_frame) |
| 1324 | { |
| 1325 | ALSSpecificConfig *sconf = &ctx->sconf; |
| 1326 | AVCodecContext *avctx = ctx->avctx; |
| 1327 | GetBitContext *gb = &ctx->gb; |
| 1328 | unsigned int div_blocks[32]; ///< block sizes. |
| 1329 | unsigned int c; |
| 1330 | unsigned int js_blocks[2]; |
| 1331 | uint32_t bs_info = 0; |
| 1332 | int ret; |
| 1333 | |
| 1334 | // skip the size of the ra unit if present in the frame |
| 1335 | if (sconf->ra_flag == RA_FLAG_FRAMES && ra_frame) |
| 1336 | skip_bits_long(gb, 32); |
| 1337 | |
| 1338 | if (sconf->mc_coding && sconf->joint_stereo) { |
| 1339 | ctx->js_switch = get_bits1(gb); |
| 1340 | align_get_bits(gb); |
| 1341 | } |
| 1342 | |
| 1343 | if (!sconf->mc_coding || ctx->js_switch) { |
| 1344 | int independent_bs = !sconf->joint_stereo; |
| 1345 | |
| 1346 | for (c = 0; c < avctx->channels; c++) { |
| 1347 | js_blocks[0] = 0; |
| 1348 | js_blocks[1] = 0; |
| 1349 | |
| 1350 | get_block_sizes(ctx, div_blocks, &bs_info); |
| 1351 | |
| 1352 | // if joint_stereo and block_switching is set, independent decoding |
| 1353 | // is signaled via the first bit of bs_info |
| 1354 | if (sconf->joint_stereo && sconf->block_switching) |
| 1355 | if (bs_info >> 31) |
| 1356 | independent_bs = 2; |
| 1357 | |
| 1358 | // if this is the last channel, it has to be decoded independently |
| 1359 | if (c == avctx->channels - 1) |
| 1360 | independent_bs = 1; |
| 1361 | |
| 1362 | if (independent_bs) { |
| 1363 | ret = decode_blocks_ind(ctx, ra_frame, c, |
| 1364 | div_blocks, js_blocks); |
| 1365 | if (ret < 0) |
| 1366 | return ret; |
| 1367 | independent_bs--; |
| 1368 | } else { |
| 1369 | ret = decode_blocks(ctx, ra_frame, c, div_blocks, js_blocks); |
| 1370 | if (ret < 0) |
| 1371 | return ret; |
| 1372 | |
| 1373 | c++; |
| 1374 | } |
| 1375 | |
| 1376 | // store carryover raw samples |
| 1377 | memmove(ctx->raw_samples[c] - sconf->max_order, |
| 1378 | ctx->raw_samples[c] - sconf->max_order + sconf->frame_length, |
| 1379 | sizeof(*ctx->raw_samples[c]) * sconf->max_order); |
| 1380 | } |
| 1381 | } else { // multi-channel coding |
| 1382 | ALSBlockData bd = { 0 }; |
| 1383 | int b, ret; |
| 1384 | int *reverted_channels = ctx->reverted_channels; |
| 1385 | unsigned int offset = 0; |
| 1386 | |
| 1387 | for (c = 0; c < avctx->channels; c++) |
| 1388 | if (ctx->chan_data[c] < ctx->chan_data_buffer) { |
| 1389 | av_log(ctx->avctx, AV_LOG_ERROR, "Invalid channel data.\n"); |
| 1390 | return AVERROR_INVALIDDATA; |
| 1391 | } |
| 1392 | |
| 1393 | memset(reverted_channels, 0, sizeof(*reverted_channels) * avctx->channels); |
| 1394 | |
| 1395 | bd.ra_block = ra_frame; |
| 1396 | bd.prev_raw_samples = ctx->prev_raw_samples; |
| 1397 | |
| 1398 | get_block_sizes(ctx, div_blocks, &bs_info); |
| 1399 | |
| 1400 | for (b = 0; b < ctx->num_blocks; b++) { |
| 1401 | bd.block_length = div_blocks[b]; |
| 1402 | if (bd.block_length <= 0) { |
| 1403 | av_log(ctx->avctx, AV_LOG_WARNING, |
| 1404 | "Invalid block length %u in channel data!\n", |
| 1405 | bd.block_length); |
| 1406 | continue; |
| 1407 | } |
| 1408 | |
| 1409 | for (c = 0; c < avctx->channels; c++) { |
| 1410 | bd.const_block = ctx->const_block + c; |
| 1411 | bd.shift_lsbs = ctx->shift_lsbs + c; |
| 1412 | bd.opt_order = ctx->opt_order + c; |
| 1413 | bd.store_prev_samples = ctx->store_prev_samples + c; |
| 1414 | bd.use_ltp = ctx->use_ltp + c; |
| 1415 | bd.ltp_lag = ctx->ltp_lag + c; |
| 1416 | bd.ltp_gain = ctx->ltp_gain[c]; |
| 1417 | bd.lpc_cof = ctx->lpc_cof[c]; |
| 1418 | bd.quant_cof = ctx->quant_cof[c]; |
| 1419 | bd.raw_samples = ctx->raw_samples[c] + offset; |
| 1420 | bd.raw_other = NULL; |
| 1421 | |
| 1422 | if ((ret = read_block(ctx, &bd)) < 0) |
| 1423 | return ret; |
| 1424 | if ((ret = read_channel_data(ctx, ctx->chan_data[c], c)) < 0) |
| 1425 | return ret; |
| 1426 | } |
| 1427 | |
| 1428 | for (c = 0; c < avctx->channels; c++) { |
| 1429 | ret = revert_channel_correlation(ctx, &bd, ctx->chan_data, |
| 1430 | reverted_channels, offset, c); |
| 1431 | if (ret < 0) |
| 1432 | return ret; |
| 1433 | } |
| 1434 | for (c = 0; c < avctx->channels; c++) { |
| 1435 | bd.const_block = ctx->const_block + c; |
| 1436 | bd.shift_lsbs = ctx->shift_lsbs + c; |
| 1437 | bd.opt_order = ctx->opt_order + c; |
| 1438 | bd.store_prev_samples = ctx->store_prev_samples + c; |
| 1439 | bd.use_ltp = ctx->use_ltp + c; |
| 1440 | bd.ltp_lag = ctx->ltp_lag + c; |
| 1441 | bd.ltp_gain = ctx->ltp_gain[c]; |
| 1442 | bd.lpc_cof = ctx->lpc_cof[c]; |
| 1443 | bd.quant_cof = ctx->quant_cof[c]; |
| 1444 | bd.raw_samples = ctx->raw_samples[c] + offset; |
| 1445 | |
| 1446 | if ((ret = decode_block(ctx, &bd)) < 0) |
| 1447 | return ret; |
| 1448 | } |
| 1449 | |
| 1450 | memset(reverted_channels, 0, avctx->channels * sizeof(*reverted_channels)); |
| 1451 | offset += div_blocks[b]; |
| 1452 | bd.ra_block = 0; |
| 1453 | } |
| 1454 | |
| 1455 | // store carryover raw samples |
| 1456 | for (c = 0; c < avctx->channels; c++) |
| 1457 | memmove(ctx->raw_samples[c] - sconf->max_order, |
| 1458 | ctx->raw_samples[c] - sconf->max_order + sconf->frame_length, |
| 1459 | sizeof(*ctx->raw_samples[c]) * sconf->max_order); |
| 1460 | } |
| 1461 | |
| 1462 | // TODO: read_diff_float_data |
| 1463 | |
| 1464 | return 0; |
| 1465 | } |
| 1466 | |
| 1467 | |
| 1468 | /** Decode an ALS frame. |
| 1469 | */ |
| 1470 | static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame_ptr, |
| 1471 | AVPacket *avpkt) |
| 1472 | { |
| 1473 | ALSDecContext *ctx = avctx->priv_data; |
| 1474 | AVFrame *frame = data; |
| 1475 | ALSSpecificConfig *sconf = &ctx->sconf; |
| 1476 | const uint8_t *buffer = avpkt->data; |
| 1477 | int buffer_size = avpkt->size; |
| 1478 | int invalid_frame, ret; |
| 1479 | unsigned int c, sample, ra_frame, bytes_read, shift; |
| 1480 | |
| 1481 | init_get_bits(&ctx->gb, buffer, buffer_size * 8); |
| 1482 | |
| 1483 | // In the case that the distance between random access frames is set to zero |
| 1484 | // (sconf->ra_distance == 0) no frame is treated as a random access frame. |
| 1485 | // For the first frame, if prediction is used, all samples used from the |
| 1486 | // previous frame are assumed to be zero. |
| 1487 | ra_frame = sconf->ra_distance && !(ctx->frame_id % sconf->ra_distance); |
| 1488 | |
| 1489 | // the last frame to decode might have a different length |
| 1490 | if (sconf->samples != 0xFFFFFFFF) |
| 1491 | ctx->cur_frame_length = FFMIN(sconf->samples - ctx->frame_id * (uint64_t) sconf->frame_length, |
| 1492 | sconf->frame_length); |
| 1493 | else |
| 1494 | ctx->cur_frame_length = sconf->frame_length; |
| 1495 | |
| 1496 | // decode the frame data |
| 1497 | if ((invalid_frame = read_frame_data(ctx, ra_frame)) < 0) |
| 1498 | av_log(ctx->avctx, AV_LOG_WARNING, |
| 1499 | "Reading frame data failed. Skipping RA unit.\n"); |
| 1500 | |
| 1501 | ctx->frame_id++; |
| 1502 | |
| 1503 | /* get output buffer */ |
| 1504 | frame->nb_samples = ctx->cur_frame_length; |
| 1505 | if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
| 1506 | return ret; |
| 1507 | |
| 1508 | // transform decoded frame into output format |
| 1509 | #define INTERLEAVE_OUTPUT(bps) \ |
| 1510 | { \ |
| 1511 | int##bps##_t *dest = (int##bps##_t*)frame->data[0]; \ |
| 1512 | shift = bps - ctx->avctx->bits_per_raw_sample; \ |
| 1513 | if (!ctx->cs_switch) { \ |
| 1514 | for (sample = 0; sample < ctx->cur_frame_length; sample++) \ |
| 1515 | for (c = 0; c < avctx->channels; c++) \ |
| 1516 | *dest++ = ctx->raw_samples[c][sample] << shift; \ |
| 1517 | } else { \ |
| 1518 | for (sample = 0; sample < ctx->cur_frame_length; sample++) \ |
| 1519 | for (c = 0; c < avctx->channels; c++) \ |
| 1520 | *dest++ = ctx->raw_samples[sconf->chan_pos[c]][sample] << shift; \ |
| 1521 | } \ |
| 1522 | } |
| 1523 | |
| 1524 | if (ctx->avctx->bits_per_raw_sample <= 16) { |
| 1525 | INTERLEAVE_OUTPUT(16) |
| 1526 | } else { |
| 1527 | INTERLEAVE_OUTPUT(32) |
| 1528 | } |
| 1529 | |
| 1530 | // update CRC |
| 1531 | if (sconf->crc_enabled && (avctx->err_recognition & (AV_EF_CRCCHECK|AV_EF_CAREFUL))) { |
| 1532 | int swap = HAVE_BIGENDIAN != sconf->msb_first; |
| 1533 | |
| 1534 | if (ctx->avctx->bits_per_raw_sample == 24) { |
| 1535 | int32_t *src = (int32_t *)frame->data[0]; |
| 1536 | |
| 1537 | for (sample = 0; |
| 1538 | sample < ctx->cur_frame_length * avctx->channels; |
| 1539 | sample++) { |
| 1540 | int32_t v; |
| 1541 | |
| 1542 | if (swap) |
| 1543 | v = av_bswap32(src[sample]); |
| 1544 | else |
| 1545 | v = src[sample]; |
| 1546 | if (!HAVE_BIGENDIAN) |
| 1547 | v >>= 8; |
| 1548 | |
| 1549 | ctx->crc = av_crc(ctx->crc_table, ctx->crc, (uint8_t*)(&v), 3); |
| 1550 | } |
| 1551 | } else { |
| 1552 | uint8_t *crc_source; |
| 1553 | |
| 1554 | if (swap) { |
| 1555 | if (ctx->avctx->bits_per_raw_sample <= 16) { |
| 1556 | int16_t *src = (int16_t*) frame->data[0]; |
| 1557 | int16_t *dest = (int16_t*) ctx->crc_buffer; |
| 1558 | for (sample = 0; |
| 1559 | sample < ctx->cur_frame_length * avctx->channels; |
| 1560 | sample++) |
| 1561 | *dest++ = av_bswap16(src[sample]); |
| 1562 | } else { |
| 1563 | ctx->bdsp.bswap_buf((uint32_t *) ctx->crc_buffer, |
| 1564 | (uint32_t *) frame->data[0], |
| 1565 | ctx->cur_frame_length * avctx->channels); |
| 1566 | } |
| 1567 | crc_source = ctx->crc_buffer; |
| 1568 | } else { |
| 1569 | crc_source = frame->data[0]; |
| 1570 | } |
| 1571 | |
| 1572 | ctx->crc = av_crc(ctx->crc_table, ctx->crc, crc_source, |
| 1573 | ctx->cur_frame_length * avctx->channels * |
| 1574 | av_get_bytes_per_sample(avctx->sample_fmt)); |
| 1575 | } |
| 1576 | |
| 1577 | |
| 1578 | // check CRC sums if this is the last frame |
| 1579 | if (ctx->cur_frame_length != sconf->frame_length && |
| 1580 | ctx->crc_org != ctx->crc) { |
| 1581 | av_log(avctx, AV_LOG_ERROR, "CRC error.\n"); |
| 1582 | if (avctx->err_recognition & AV_EF_EXPLODE) |
| 1583 | return AVERROR_INVALIDDATA; |
| 1584 | } |
| 1585 | } |
| 1586 | |
| 1587 | *got_frame_ptr = 1; |
| 1588 | |
| 1589 | bytes_read = invalid_frame ? buffer_size : |
| 1590 | (get_bits_count(&ctx->gb) + 7) >> 3; |
| 1591 | |
| 1592 | return bytes_read; |
| 1593 | } |
| 1594 | |
| 1595 | |
| 1596 | /** Uninitialize the ALS decoder. |
| 1597 | */ |
| 1598 | static av_cold int decode_end(AVCodecContext *avctx) |
| 1599 | { |
| 1600 | ALSDecContext *ctx = avctx->priv_data; |
| 1601 | |
| 1602 | av_freep(&ctx->sconf.chan_pos); |
| 1603 | |
| 1604 | ff_bgmc_end(&ctx->bgmc_lut, &ctx->bgmc_lut_status); |
| 1605 | |
| 1606 | av_freep(&ctx->const_block); |
| 1607 | av_freep(&ctx->shift_lsbs); |
| 1608 | av_freep(&ctx->opt_order); |
| 1609 | av_freep(&ctx->store_prev_samples); |
| 1610 | av_freep(&ctx->use_ltp); |
| 1611 | av_freep(&ctx->ltp_lag); |
| 1612 | av_freep(&ctx->ltp_gain); |
| 1613 | av_freep(&ctx->ltp_gain_buffer); |
| 1614 | av_freep(&ctx->quant_cof); |
| 1615 | av_freep(&ctx->lpc_cof); |
| 1616 | av_freep(&ctx->quant_cof_buffer); |
| 1617 | av_freep(&ctx->lpc_cof_buffer); |
| 1618 | av_freep(&ctx->lpc_cof_reversed_buffer); |
| 1619 | av_freep(&ctx->prev_raw_samples); |
| 1620 | av_freep(&ctx->raw_samples); |
| 1621 | av_freep(&ctx->raw_buffer); |
| 1622 | av_freep(&ctx->chan_data); |
| 1623 | av_freep(&ctx->chan_data_buffer); |
| 1624 | av_freep(&ctx->reverted_channels); |
| 1625 | av_freep(&ctx->crc_buffer); |
| 1626 | |
| 1627 | return 0; |
| 1628 | } |
| 1629 | |
| 1630 | |
| 1631 | /** Initialize the ALS decoder. |
| 1632 | */ |
| 1633 | static av_cold int decode_init(AVCodecContext *avctx) |
| 1634 | { |
| 1635 | unsigned int c; |
| 1636 | unsigned int channel_size; |
| 1637 | int num_buffers, ret; |
| 1638 | ALSDecContext *ctx = avctx->priv_data; |
| 1639 | ALSSpecificConfig *sconf = &ctx->sconf; |
| 1640 | ctx->avctx = avctx; |
| 1641 | |
| 1642 | if (!avctx->extradata) { |
| 1643 | av_log(avctx, AV_LOG_ERROR, "Missing required ALS extradata.\n"); |
| 1644 | return AVERROR_INVALIDDATA; |
| 1645 | } |
| 1646 | |
| 1647 | if ((ret = read_specific_config(ctx)) < 0) { |
| 1648 | av_log(avctx, AV_LOG_ERROR, "Reading ALSSpecificConfig failed.\n"); |
| 1649 | goto fail; |
| 1650 | } |
| 1651 | |
| 1652 | if ((ret = check_specific_config(ctx)) < 0) { |
| 1653 | goto fail; |
| 1654 | } |
| 1655 | |
| 1656 | if (sconf->bgmc) { |
| 1657 | ret = ff_bgmc_init(avctx, &ctx->bgmc_lut, &ctx->bgmc_lut_status); |
| 1658 | if (ret < 0) |
| 1659 | goto fail; |
| 1660 | } |
| 1661 | if (sconf->floating) { |
| 1662 | avctx->sample_fmt = AV_SAMPLE_FMT_FLT; |
| 1663 | avctx->bits_per_raw_sample = 32; |
| 1664 | } else { |
| 1665 | avctx->sample_fmt = sconf->resolution > 1 |
| 1666 | ? AV_SAMPLE_FMT_S32 : AV_SAMPLE_FMT_S16; |
| 1667 | avctx->bits_per_raw_sample = (sconf->resolution + 1) * 8; |
| 1668 | } |
| 1669 | |
| 1670 | // set maximum Rice parameter for progressive decoding based on resolution |
| 1671 | // This is not specified in 14496-3 but actually done by the reference |
| 1672 | // codec RM22 revision 2. |
| 1673 | ctx->s_max = sconf->resolution > 1 ? 31 : 15; |
| 1674 | |
| 1675 | // set lag value for long-term prediction |
| 1676 | ctx->ltp_lag_length = 8 + (avctx->sample_rate >= 96000) + |
| 1677 | (avctx->sample_rate >= 192000); |
| 1678 | |
| 1679 | // allocate quantized parcor coefficient buffer |
| 1680 | num_buffers = sconf->mc_coding ? avctx->channels : 1; |
| 1681 | |
| 1682 | ctx->quant_cof = av_malloc(sizeof(*ctx->quant_cof) * num_buffers); |
| 1683 | ctx->lpc_cof = av_malloc(sizeof(*ctx->lpc_cof) * num_buffers); |
| 1684 | ctx->quant_cof_buffer = av_malloc(sizeof(*ctx->quant_cof_buffer) * |
| 1685 | num_buffers * sconf->max_order); |
| 1686 | ctx->lpc_cof_buffer = av_malloc(sizeof(*ctx->lpc_cof_buffer) * |
| 1687 | num_buffers * sconf->max_order); |
| 1688 | ctx->lpc_cof_reversed_buffer = av_malloc(sizeof(*ctx->lpc_cof_buffer) * |
| 1689 | sconf->max_order); |
| 1690 | |
| 1691 | if (!ctx->quant_cof || !ctx->lpc_cof || |
| 1692 | !ctx->quant_cof_buffer || !ctx->lpc_cof_buffer || |
| 1693 | !ctx->lpc_cof_reversed_buffer) { |
| 1694 | av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n"); |
| 1695 | ret = AVERROR(ENOMEM); |
| 1696 | goto fail; |
| 1697 | } |
| 1698 | |
| 1699 | // assign quantized parcor coefficient buffers |
| 1700 | for (c = 0; c < num_buffers; c++) { |
| 1701 | ctx->quant_cof[c] = ctx->quant_cof_buffer + c * sconf->max_order; |
| 1702 | ctx->lpc_cof[c] = ctx->lpc_cof_buffer + c * sconf->max_order; |
| 1703 | } |
| 1704 | |
| 1705 | // allocate and assign lag and gain data buffer for ltp mode |
| 1706 | ctx->const_block = av_malloc (sizeof(*ctx->const_block) * num_buffers); |
| 1707 | ctx->shift_lsbs = av_malloc (sizeof(*ctx->shift_lsbs) * num_buffers); |
| 1708 | ctx->opt_order = av_malloc (sizeof(*ctx->opt_order) * num_buffers); |
| 1709 | ctx->store_prev_samples = av_malloc(sizeof(*ctx->store_prev_samples) * num_buffers); |
| 1710 | ctx->use_ltp = av_mallocz(sizeof(*ctx->use_ltp) * num_buffers); |
| 1711 | ctx->ltp_lag = av_malloc (sizeof(*ctx->ltp_lag) * num_buffers); |
| 1712 | ctx->ltp_gain = av_malloc (sizeof(*ctx->ltp_gain) * num_buffers); |
| 1713 | ctx->ltp_gain_buffer = av_malloc (sizeof(*ctx->ltp_gain_buffer) * |
| 1714 | num_buffers * 5); |
| 1715 | |
| 1716 | if (!ctx->const_block || !ctx->shift_lsbs || |
| 1717 | !ctx->opt_order || !ctx->store_prev_samples || |
| 1718 | !ctx->use_ltp || !ctx->ltp_lag || |
| 1719 | !ctx->ltp_gain || !ctx->ltp_gain_buffer) { |
| 1720 | av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n"); |
| 1721 | ret = AVERROR(ENOMEM); |
| 1722 | goto fail; |
| 1723 | } |
| 1724 | |
| 1725 | for (c = 0; c < num_buffers; c++) |
| 1726 | ctx->ltp_gain[c] = ctx->ltp_gain_buffer + c * 5; |
| 1727 | |
| 1728 | // allocate and assign channel data buffer for mcc mode |
| 1729 | if (sconf->mc_coding) { |
| 1730 | ctx->chan_data_buffer = av_malloc(sizeof(*ctx->chan_data_buffer) * |
| 1731 | num_buffers * num_buffers); |
| 1732 | ctx->chan_data = av_malloc(sizeof(*ctx->chan_data) * |
| 1733 | num_buffers); |
| 1734 | ctx->reverted_channels = av_malloc(sizeof(*ctx->reverted_channels) * |
| 1735 | num_buffers); |
| 1736 | |
| 1737 | if (!ctx->chan_data_buffer || !ctx->chan_data || !ctx->reverted_channels) { |
| 1738 | av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n"); |
| 1739 | ret = AVERROR(ENOMEM); |
| 1740 | goto fail; |
| 1741 | } |
| 1742 | |
| 1743 | for (c = 0; c < num_buffers; c++) |
| 1744 | ctx->chan_data[c] = ctx->chan_data_buffer + c * num_buffers; |
| 1745 | } else { |
| 1746 | ctx->chan_data = NULL; |
| 1747 | ctx->chan_data_buffer = NULL; |
| 1748 | ctx->reverted_channels = NULL; |
| 1749 | } |
| 1750 | |
| 1751 | channel_size = sconf->frame_length + sconf->max_order; |
| 1752 | |
| 1753 | ctx->prev_raw_samples = av_malloc (sizeof(*ctx->prev_raw_samples) * sconf->max_order); |
| 1754 | ctx->raw_buffer = av_mallocz(sizeof(*ctx-> raw_buffer) * avctx->channels * channel_size); |
| 1755 | ctx->raw_samples = av_malloc (sizeof(*ctx-> raw_samples) * avctx->channels); |
| 1756 | |
| 1757 | // allocate previous raw sample buffer |
| 1758 | if (!ctx->prev_raw_samples || !ctx->raw_buffer|| !ctx->raw_samples) { |
| 1759 | av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n"); |
| 1760 | ret = AVERROR(ENOMEM); |
| 1761 | goto fail; |
| 1762 | } |
| 1763 | |
| 1764 | // assign raw samples buffers |
| 1765 | ctx->raw_samples[0] = ctx->raw_buffer + sconf->max_order; |
| 1766 | for (c = 1; c < avctx->channels; c++) |
| 1767 | ctx->raw_samples[c] = ctx->raw_samples[c - 1] + channel_size; |
| 1768 | |
| 1769 | // allocate crc buffer |
| 1770 | if (HAVE_BIGENDIAN != sconf->msb_first && sconf->crc_enabled && |
| 1771 | (avctx->err_recognition & (AV_EF_CRCCHECK|AV_EF_CAREFUL))) { |
| 1772 | ctx->crc_buffer = av_malloc(sizeof(*ctx->crc_buffer) * |
| 1773 | ctx->cur_frame_length * |
| 1774 | avctx->channels * |
| 1775 | av_get_bytes_per_sample(avctx->sample_fmt)); |
| 1776 | if (!ctx->crc_buffer) { |
| 1777 | av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n"); |
| 1778 | ret = AVERROR(ENOMEM); |
| 1779 | goto fail; |
| 1780 | } |
| 1781 | } |
| 1782 | |
| 1783 | ff_bswapdsp_init(&ctx->bdsp); |
| 1784 | |
| 1785 | return 0; |
| 1786 | |
| 1787 | fail: |
| 1788 | decode_end(avctx); |
| 1789 | return ret; |
| 1790 | } |
| 1791 | |
| 1792 | |
| 1793 | /** Flush (reset) the frame ID after seeking. |
| 1794 | */ |
| 1795 | static av_cold void flush(AVCodecContext *avctx) |
| 1796 | { |
| 1797 | ALSDecContext *ctx = avctx->priv_data; |
| 1798 | |
| 1799 | ctx->frame_id = 0; |
| 1800 | } |
| 1801 | |
| 1802 | |
| 1803 | AVCodec ff_als_decoder = { |
| 1804 | .name = "als", |
| 1805 | .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 Audio Lossless Coding (ALS)"), |
| 1806 | .type = AVMEDIA_TYPE_AUDIO, |
| 1807 | .id = AV_CODEC_ID_MP4ALS, |
| 1808 | .priv_data_size = sizeof(ALSDecContext), |
| 1809 | .init = decode_init, |
| 1810 | .close = decode_end, |
| 1811 | .decode = decode_frame, |
| 1812 | .flush = flush, |
| 1813 | .capabilities = CODEC_CAP_SUBFRAMES | CODEC_CAP_DR1, |
| 1814 | }; |