3 * Copyright (c) 2009 Thilo Borgmann <thilo.borgmann _at_ googlemail.com>
5 * This file is part of Libav.
7 * Libav 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.
12 * Libav 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.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
25 * @author Thilo Borgmann <thilo.borgmann _at_ googlemail.com>
31 #include "mpeg4audio.h"
32 #include "bytestream.h"
36 #include "libavutil/samplefmt.h"
37 #include "libavutil/crc.h"
41 /** Rice parameters and corresponding index offsets for decoding the
42 * indices of scaled PARCOR values. The table chosen is set globally
43 * by the encoder and stored in ALSSpecificConfig.
45 static const int8_t parcor_rice_table[3][20][2] = {
46 { {-52, 4}, {-29, 5}, {-31, 4}, { 19, 4}, {-16, 4},
47 { 12, 3}, { -7, 3}, { 9, 3}, { -5, 3}, { 6, 3},
48 { -4, 3}, { 3, 3}, { -3, 2}, { 3, 2}, { -2, 2},
49 { 3, 2}, { -1, 2}, { 2, 2}, { -1, 2}, { 2, 2} },
50 { {-58, 3}, {-42, 4}, {-46, 4}, { 37, 5}, {-36, 4},
51 { 29, 4}, {-29, 4}, { 25, 4}, {-23, 4}, { 20, 4},
52 {-17, 4}, { 16, 4}, {-12, 4}, { 12, 3}, {-10, 4},
53 { 7, 3}, { -4, 4}, { 3, 3}, { -1, 3}, { 1, 3} },
54 { {-59, 3}, {-45, 5}, {-50, 4}, { 38, 4}, {-39, 4},
55 { 32, 4}, {-30, 4}, { 25, 3}, {-23, 3}, { 20, 3},
56 {-20, 3}, { 16, 3}, {-13, 3}, { 10, 3}, { -7, 3},
57 { 3, 3}, { 0, 3}, { -1, 3}, { 2, 3}, { -1, 2} }
61 /** Scaled PARCOR values used for the first two PARCOR coefficients.
62 * To be indexed by the Rice coded indices.
63 * Generated by: parcor_scaled_values[i] = 32 + ((i * (i+1)) << 7) - (1 << 20)
64 * Actual values are divided by 32 in order to be stored in 16 bits.
66 static const int16_t parcor_scaled_values[] = {
67 -1048544 / 32, -1048288 / 32, -1047776 / 32, -1047008 / 32,
68 -1045984 / 32, -1044704 / 32, -1043168 / 32, -1041376 / 32,
69 -1039328 / 32, -1037024 / 32, -1034464 / 32, -1031648 / 32,
70 -1028576 / 32, -1025248 / 32, -1021664 / 32, -1017824 / 32,
71 -1013728 / 32, -1009376 / 32, -1004768 / 32, -999904 / 32,
72 -994784 / 32, -989408 / 32, -983776 / 32, -977888 / 32,
73 -971744 / 32, -965344 / 32, -958688 / 32, -951776 / 32,
74 -944608 / 32, -937184 / 32, -929504 / 32, -921568 / 32,
75 -913376 / 32, -904928 / 32, -896224 / 32, -887264 / 32,
76 -878048 / 32, -868576 / 32, -858848 / 32, -848864 / 32,
77 -838624 / 32, -828128 / 32, -817376 / 32, -806368 / 32,
78 -795104 / 32, -783584 / 32, -771808 / 32, -759776 / 32,
79 -747488 / 32, -734944 / 32, -722144 / 32, -709088 / 32,
80 -695776 / 32, -682208 / 32, -668384 / 32, -654304 / 32,
81 -639968 / 32, -625376 / 32, -610528 / 32, -595424 / 32,
82 -580064 / 32, -564448 / 32, -548576 / 32, -532448 / 32,
83 -516064 / 32, -499424 / 32, -482528 / 32, -465376 / 32,
84 -447968 / 32, -430304 / 32, -412384 / 32, -394208 / 32,
85 -375776 / 32, -357088 / 32, -338144 / 32, -318944 / 32,
86 -299488 / 32, -279776 / 32, -259808 / 32, -239584 / 32,
87 -219104 / 32, -198368 / 32, -177376 / 32, -156128 / 32,
88 -134624 / 32, -112864 / 32, -90848 / 32, -68576 / 32,
89 -46048 / 32, -23264 / 32, -224 / 32, 23072 / 32,
90 46624 / 32, 70432 / 32, 94496 / 32, 118816 / 32,
91 143392 / 32, 168224 / 32, 193312 / 32, 218656 / 32,
92 244256 / 32, 270112 / 32, 296224 / 32, 322592 / 32,
93 349216 / 32, 376096 / 32, 403232 / 32, 430624 / 32,
94 458272 / 32, 486176 / 32, 514336 / 32, 542752 / 32,
95 571424 / 32, 600352 / 32, 629536 / 32, 658976 / 32,
96 688672 / 32, 718624 / 32, 748832 / 32, 779296 / 32,
97 810016 / 32, 840992 / 32, 872224 / 32, 903712 / 32,
98 935456 / 32, 967456 / 32, 999712 / 32, 1032224 / 32
102 /** Gain values of p(0) for long-term prediction.
103 * To be indexed by the Rice coded indices.
105 static const uint8_t ltp_gain_values [4][4] = {
113 /** Inter-channel weighting factors for multi-channel correlation.
114 * To be indexed by the Rice coded indices.
116 static const int16_t mcc_weightings[] = {
117 204, 192, 179, 166, 153, 140, 128, 115,
118 102, 89, 76, 64, 51, 38, 25, 12,
119 0, -12, -25, -38, -51, -64, -76, -89,
120 -102, -115, -128, -140, -153, -166, -179, -192
124 /** Tail codes used in arithmetic coding using block Gilbert-Moore codes.
126 static const uint8_t tail_code[16][6] = {
127 { 74, 44, 25, 13, 7, 3},
128 { 68, 42, 24, 13, 7, 3},
129 { 58, 39, 23, 13, 7, 3},
130 {126, 70, 37, 19, 10, 5},
131 {132, 70, 37, 20, 10, 5},
132 {124, 70, 38, 20, 10, 5},
133 {120, 69, 37, 20, 11, 5},
134 {116, 67, 37, 20, 11, 5},
135 {108, 66, 36, 20, 10, 5},
136 {102, 62, 36, 20, 10, 5},
137 { 88, 58, 34, 19, 10, 5},
138 {162, 89, 49, 25, 13, 7},
139 {156, 87, 49, 26, 14, 7},
140 {150, 86, 47, 26, 14, 7},
141 {142, 84, 47, 26, 14, 7},
142 {131, 79, 46, 26, 14, 7}
154 uint32_t samples; ///< number of samples, 0xFFFFFFFF if unknown
155 int resolution; ///< 000 = 8-bit; 001 = 16-bit; 010 = 24-bit; 011 = 32-bit
156 int floating; ///< 1 = IEEE 32-bit floating-point, 0 = integer
157 int msb_first; ///< 1 = original CRC calculated on big-endian system, 0 = little-endian
158 int frame_length; ///< frame length for each frame (last frame may differ)
159 int ra_distance; ///< distance between RA frames (in frames, 0...255)
160 enum RA_Flag ra_flag; ///< indicates where the size of ra units is stored
161 int adapt_order; ///< adaptive order: 1 = on, 0 = off
162 int coef_table; ///< table index of Rice code parameters
163 int long_term_prediction; ///< long term prediction (LTP): 1 = on, 0 = off
164 int max_order; ///< maximum prediction order (0..1023)
165 int block_switching; ///< number of block switching levels
166 int bgmc; ///< "Block Gilbert-Moore Code": 1 = on, 0 = off (Rice coding only)
167 int sb_part; ///< sub-block partition
168 int joint_stereo; ///< joint stereo: 1 = on, 0 = off
169 int mc_coding; ///< extended inter-channel coding (multi channel coding): 1 = on, 0 = off
170 int chan_config; ///< indicates that a chan_config_info field is present
171 int chan_sort; ///< channel rearrangement: 1 = on, 0 = off
172 int rlslms; ///< use "Recursive Least Square-Least Mean Square" predictor: 1 = on, 0 = off
173 int chan_config_info; ///< mapping of channels to loudspeaker locations. Unused until setting channel configuration is implemented.
174 int *chan_pos; ///< original channel positions
175 int crc_enabled; ///< enable Cyclic Redundancy Checksum
190 AVCodecContext *avctx;
191 ALSSpecificConfig sconf;
194 const AVCRC *crc_table;
195 uint32_t crc_org; ///< CRC value of the original input data
196 uint32_t crc; ///< CRC value calculated from decoded data
197 unsigned int cur_frame_length; ///< length of the current frame to decode
198 unsigned int frame_id; ///< the frame ID / number of the current frame
199 unsigned int js_switch; ///< if true, joint-stereo decoding is enforced
200 unsigned int num_blocks; ///< number of blocks used in the current frame
201 unsigned int s_max; ///< maximum Rice parameter allowed in entropy coding
202 uint8_t *bgmc_lut; ///< pointer at lookup tables used for BGMC
203 int *bgmc_lut_status; ///< pointer at lookup table status flags used for BGMC
204 int ltp_lag_length; ///< number of bits used for ltp lag value
205 int *const_block; ///< contains const_block flags for all channels
206 unsigned int *shift_lsbs; ///< contains shift_lsbs flags for all channels
207 unsigned int *opt_order; ///< contains opt_order flags for all channels
208 int *store_prev_samples; ///< contains store_prev_samples flags for all channels
209 int *use_ltp; ///< contains use_ltp flags for all channels
210 int *ltp_lag; ///< contains ltp lag values for all channels
211 int **ltp_gain; ///< gain values for ltp 5-tap filter for a channel
212 int *ltp_gain_buffer; ///< contains all gain values for ltp 5-tap filter
213 int32_t **quant_cof; ///< quantized parcor coefficients for a channel
214 int32_t *quant_cof_buffer; ///< contains all quantized parcor coefficients
215 int32_t **lpc_cof; ///< coefficients of the direct form prediction filter for a channel
216 int32_t *lpc_cof_buffer; ///< contains all coefficients of the direct form prediction filter
217 int32_t *lpc_cof_reversed_buffer; ///< temporary buffer to set up a reversed versio of lpc_cof_buffer
218 ALSChannelData **chan_data; ///< channel data for multi-channel correlation
219 ALSChannelData *chan_data_buffer; ///< contains channel data for all channels
220 int *reverted_channels; ///< stores a flag for each reverted channel
221 int32_t *prev_raw_samples; ///< contains unshifted raw samples from the previous block
222 int32_t **raw_samples; ///< decoded raw samples for each channel
223 int32_t *raw_buffer; ///< contains all decoded raw samples including carryover samples
224 uint8_t *crc_buffer; ///< buffer of byte order corrected samples used for CRC check
229 unsigned int block_length; ///< number of samples within the block
230 unsigned int ra_block; ///< if true, this is a random access block
231 int *const_block; ///< if true, this is a constant value block
232 int js_blocks; ///< true if this block contains a difference signal
233 unsigned int *shift_lsbs; ///< shift of values for this block
234 unsigned int *opt_order; ///< prediction order of this block
235 int *store_prev_samples;///< if true, carryover samples have to be stored
236 int *use_ltp; ///< if true, long-term prediction is used
237 int *ltp_lag; ///< lag value for long-term prediction
238 int *ltp_gain; ///< gain values for ltp 5-tap filter
239 int32_t *quant_cof; ///< quantized parcor coefficients
240 int32_t *lpc_cof; ///< coefficients of the direct form prediction
241 int32_t *raw_samples; ///< decoded raw samples / residuals for this block
242 int32_t *prev_raw_samples; ///< contains unshifted raw samples from the previous block
243 int32_t *raw_other; ///< decoded raw samples of the other channel of a channel pair
247 static av_cold void dprint_specific_config(ALSDecContext *ctx)
250 AVCodecContext *avctx = ctx->avctx;
251 ALSSpecificConfig *sconf = &ctx->sconf;
253 av_dlog(avctx, "resolution = %i\n", sconf->resolution);
254 av_dlog(avctx, "floating = %i\n", sconf->floating);
255 av_dlog(avctx, "frame_length = %i\n", sconf->frame_length);
256 av_dlog(avctx, "ra_distance = %i\n", sconf->ra_distance);
257 av_dlog(avctx, "ra_flag = %i\n", sconf->ra_flag);
258 av_dlog(avctx, "adapt_order = %i\n", sconf->adapt_order);
259 av_dlog(avctx, "coef_table = %i\n", sconf->coef_table);
260 av_dlog(avctx, "long_term_prediction = %i\n", sconf->long_term_prediction);
261 av_dlog(avctx, "max_order = %i\n", sconf->max_order);
262 av_dlog(avctx, "block_switching = %i\n", sconf->block_switching);
263 av_dlog(avctx, "bgmc = %i\n", sconf->bgmc);
264 av_dlog(avctx, "sb_part = %i\n", sconf->sb_part);
265 av_dlog(avctx, "joint_stereo = %i\n", sconf->joint_stereo);
266 av_dlog(avctx, "mc_coding = %i\n", sconf->mc_coding);
267 av_dlog(avctx, "chan_config = %i\n", sconf->chan_config);
268 av_dlog(avctx, "chan_sort = %i\n", sconf->chan_sort);
269 av_dlog(avctx, "RLSLMS = %i\n", sconf->rlslms);
270 av_dlog(avctx, "chan_config_info = %i\n", sconf->chan_config_info);
275 /** Read an ALSSpecificConfig from a buffer into the output struct.
277 static av_cold int read_specific_config(ALSDecContext *ctx)
281 int i, config_offset;
282 MPEG4AudioConfig m4ac;
283 ALSSpecificConfig *sconf = &ctx->sconf;
284 AVCodecContext *avctx = ctx->avctx;
285 uint32_t als_id, header_size, trailer_size;
287 init_get_bits(&gb, avctx->extradata, avctx->extradata_size * 8);
289 config_offset = avpriv_mpeg4audio_get_config(&m4ac, avctx->extradata,
290 avctx->extradata_size * 8, 1);
292 if (config_offset < 0)
293 return AVERROR_INVALIDDATA;
295 skip_bits_long(&gb, config_offset);
297 if (get_bits_left(&gb) < (30 << 3))
298 return AVERROR_INVALIDDATA;
300 // read the fixed items
301 als_id = get_bits_long(&gb, 32);
302 avctx->sample_rate = m4ac.sample_rate;
303 skip_bits_long(&gb, 32); // sample rate already known
304 sconf->samples = get_bits_long(&gb, 32);
305 avctx->channels = m4ac.channels;
306 skip_bits(&gb, 16); // number of channels already knwon
307 skip_bits(&gb, 3); // skip file_type
308 sconf->resolution = get_bits(&gb, 3);
309 sconf->floating = get_bits1(&gb);
310 sconf->msb_first = get_bits1(&gb);
311 sconf->frame_length = get_bits(&gb, 16) + 1;
312 sconf->ra_distance = get_bits(&gb, 8);
313 sconf->ra_flag = get_bits(&gb, 2);
314 sconf->adapt_order = get_bits1(&gb);
315 sconf->coef_table = get_bits(&gb, 2);
316 sconf->long_term_prediction = get_bits1(&gb);
317 sconf->max_order = get_bits(&gb, 10);
318 sconf->block_switching = get_bits(&gb, 2);
319 sconf->bgmc = get_bits1(&gb);
320 sconf->sb_part = get_bits1(&gb);
321 sconf->joint_stereo = get_bits1(&gb);
322 sconf->mc_coding = get_bits1(&gb);
323 sconf->chan_config = get_bits1(&gb);
324 sconf->chan_sort = get_bits1(&gb);
325 sconf->crc_enabled = get_bits1(&gb);
326 sconf->rlslms = get_bits1(&gb);
327 skip_bits(&gb, 5); // skip 5 reserved bits
328 skip_bits1(&gb); // skip aux_data_enabled
331 // check for ALSSpecificConfig struct
332 if (als_id != MKBETAG('A','L','S','\0'))
333 return AVERROR_INVALIDDATA;
335 ctx->cur_frame_length = sconf->frame_length;
337 // read channel config
338 if (sconf->chan_config)
339 sconf->chan_config_info = get_bits(&gb, 16);
340 // TODO: use this to set avctx->channel_layout
343 // read channel sorting
344 if (sconf->chan_sort && avctx->channels > 1) {
345 int chan_pos_bits = av_ceil_log2(avctx->channels);
346 int bits_needed = avctx->channels * chan_pos_bits + 7;
347 if (get_bits_left(&gb) < bits_needed)
348 return AVERROR_INVALIDDATA;
350 if (!(sconf->chan_pos = av_malloc(avctx->channels * sizeof(*sconf->chan_pos))))
351 return AVERROR(ENOMEM);
353 for (i = 0; i < avctx->channels; i++)
354 sconf->chan_pos[i] = get_bits(&gb, chan_pos_bits);
357 // TODO: use this to actually do channel sorting
359 sconf->chan_sort = 0;
363 // read fixed header and trailer sizes,
364 // if size = 0xFFFFFFFF then there is no data field!
365 if (get_bits_left(&gb) < 64)
366 return AVERROR_INVALIDDATA;
368 header_size = get_bits_long(&gb, 32);
369 trailer_size = get_bits_long(&gb, 32);
370 if (header_size == 0xFFFFFFFF)
372 if (trailer_size == 0xFFFFFFFF)
375 ht_size = ((int64_t)(header_size) + (int64_t)(trailer_size)) << 3;
378 // skip the header and trailer data
379 if (get_bits_left(&gb) < ht_size)
380 return AVERROR_INVALIDDATA;
382 if (ht_size > INT32_MAX)
383 return AVERROR_PATCHWELCOME;
385 skip_bits_long(&gb, ht_size);
388 // initialize CRC calculation
389 if (sconf->crc_enabled) {
390 if (get_bits_left(&gb) < 32)
391 return AVERROR_INVALIDDATA;
393 if (avctx->err_recognition & AV_EF_CRCCHECK) {
394 ctx->crc_table = av_crc_get_table(AV_CRC_32_IEEE_LE);
395 ctx->crc = 0xFFFFFFFF;
396 ctx->crc_org = ~get_bits_long(&gb, 32);
398 skip_bits_long(&gb, 32);
402 // no need to read the rest of ALSSpecificConfig (ra_unit_size & aux data)
404 dprint_specific_config(ctx);
410 /** Check the ALSSpecificConfig for unsupported features.
412 static int check_specific_config(ALSDecContext *ctx)
414 ALSSpecificConfig *sconf = &ctx->sconf;
417 // report unsupported feature and set error value
418 #define MISSING_ERR(cond, str, errval) \
421 avpriv_report_missing_feature(ctx->avctx, \
427 MISSING_ERR(sconf->floating, "Floating point decoding", AVERROR_PATCHWELCOME);
428 MISSING_ERR(sconf->rlslms, "Adaptive RLS-LMS prediction", AVERROR_PATCHWELCOME);
429 MISSING_ERR(sconf->chan_sort, "Channel sorting", 0);
435 /** Parse the bs_info field to extract the block partitioning used in
436 * block switching mode, refer to ISO/IEC 14496-3, section 11.6.2.
438 static void parse_bs_info(const uint32_t bs_info, unsigned int n,
439 unsigned int div, unsigned int **div_blocks,
440 unsigned int *num_blocks)
442 if (n < 31 && ((bs_info << n) & 0x40000000)) {
443 // if the level is valid and the investigated bit n is set
444 // then recursively check both children at bits (2n+1) and (2n+2)
447 parse_bs_info(bs_info, n + 1, div, div_blocks, num_blocks);
448 parse_bs_info(bs_info, n + 2, div, div_blocks, num_blocks);
450 // else the bit is not set or the last level has been reached
451 // (bit implicitly not set)
459 /** Read and decode a Rice codeword.
461 static int32_t decode_rice(GetBitContext *gb, unsigned int k)
463 int max = get_bits_left(gb) - k;
464 int q = get_unary(gb, 0, max);
465 int r = k ? get_bits1(gb) : !(q & 1);
469 q += get_bits_long(gb, k - 1);
477 /** Convert PARCOR coefficient k to direct filter coefficient.
479 static void parcor_to_lpc(unsigned int k, const int32_t *par, int32_t *cof)
483 for (i = 0, j = k - 1; i < j; i++, j--) {
484 int tmp1 = ((MUL64(par[k], cof[j]) + (1 << 19)) >> 20);
485 cof[j] += ((MUL64(par[k], cof[i]) + (1 << 19)) >> 20);
489 cof[i] += ((MUL64(par[k], cof[j]) + (1 << 19)) >> 20);
495 /** Read block switching field if necessary and set actual block sizes.
496 * Also assure that the block sizes of the last frame correspond to the
497 * actual number of samples.
499 static void get_block_sizes(ALSDecContext *ctx, unsigned int *div_blocks,
502 ALSSpecificConfig *sconf = &ctx->sconf;
503 GetBitContext *gb = &ctx->gb;
504 unsigned int *ptr_div_blocks = div_blocks;
507 if (sconf->block_switching) {
508 unsigned int bs_info_len = 1 << (sconf->block_switching + 2);
509 *bs_info = get_bits_long(gb, bs_info_len);
510 *bs_info <<= (32 - bs_info_len);
514 parse_bs_info(*bs_info, 0, 0, &ptr_div_blocks, &ctx->num_blocks);
516 // The last frame may have an overdetermined block structure given in
517 // the bitstream. In that case the defined block structure would need
518 // more samples than available to be consistent.
519 // The block structure is actually used but the block sizes are adapted
520 // to fit the actual number of available samples.
521 // Example: 5 samples, 2nd level block sizes: 2 2 2 2.
522 // This results in the actual block sizes: 2 2 1 0.
523 // This is not specified in 14496-3 but actually done by the reference
524 // codec RM22 revision 2.
525 // This appears to happen in case of an odd number of samples in the last
526 // frame which is actually not allowed by the block length switching part
528 // The ALS conformance files feature an odd number of samples in the last
531 for (b = 0; b < ctx->num_blocks; b++)
532 div_blocks[b] = ctx->sconf.frame_length >> div_blocks[b];
534 if (ctx->cur_frame_length != ctx->sconf.frame_length) {
535 unsigned int remaining = ctx->cur_frame_length;
537 for (b = 0; b < ctx->num_blocks; b++) {
538 if (remaining <= div_blocks[b]) {
539 div_blocks[b] = remaining;
540 ctx->num_blocks = b + 1;
544 remaining -= div_blocks[b];
550 /** Read the block data for a constant block
552 static void read_const_block_data(ALSDecContext *ctx, ALSBlockData *bd)
554 ALSSpecificConfig *sconf = &ctx->sconf;
555 AVCodecContext *avctx = ctx->avctx;
556 GetBitContext *gb = &ctx->gb;
558 *bd->raw_samples = 0;
559 *bd->const_block = get_bits1(gb); // 1 = constant value, 0 = zero block (silence)
560 bd->js_blocks = get_bits1(gb);
562 // skip 5 reserved bits
565 if (*bd->const_block) {
566 unsigned int const_val_bits = sconf->floating ? 24 : avctx->bits_per_raw_sample;
567 *bd->raw_samples = get_sbits_long(gb, const_val_bits);
570 // ensure constant block decoding by reusing this field
571 *bd->const_block = 1;
575 /** Decode the block data for a constant block
577 static void decode_const_block_data(ALSDecContext *ctx, ALSBlockData *bd)
579 int smp = bd->block_length - 1;
580 int32_t val = *bd->raw_samples;
581 int32_t *dst = bd->raw_samples + 1;
583 // write raw samples into buffer
589 /** Read the block data for a non-constant block
591 static int read_var_block_data(ALSDecContext *ctx, ALSBlockData *bd)
593 ALSSpecificConfig *sconf = &ctx->sconf;
594 AVCodecContext *avctx = ctx->avctx;
595 GetBitContext *gb = &ctx->gb;
599 unsigned int sub_blocks, log2_sub_blocks, sb_length;
600 unsigned int start = 0;
601 unsigned int opt_order;
603 int32_t *quant_cof = bd->quant_cof;
604 int32_t *current_res;
607 // ensure variable block decoding by reusing this field
608 *bd->const_block = 0;
611 bd->js_blocks = get_bits1(gb);
613 opt_order = *bd->opt_order;
615 // determine the number of subblocks for entropy decoding
616 if (!sconf->bgmc && !sconf->sb_part) {
619 if (sconf->bgmc && sconf->sb_part)
620 log2_sub_blocks = get_bits(gb, 2);
622 log2_sub_blocks = 2 * get_bits1(gb);
625 sub_blocks = 1 << log2_sub_blocks;
627 // do not continue in case of a damaged stream since
628 // block_length must be evenly divisible by sub_blocks
629 if (bd->block_length & (sub_blocks - 1)) {
630 av_log(avctx, AV_LOG_WARNING,
631 "Block length is not evenly divisible by the number of subblocks.\n");
632 return AVERROR_INVALIDDATA;
635 sb_length = bd->block_length >> log2_sub_blocks;
638 s[0] = get_bits(gb, 8 + (sconf->resolution > 1));
639 for (k = 1; k < sub_blocks; k++)
640 s[k] = s[k - 1] + decode_rice(gb, 2);
642 for (k = 0; k < sub_blocks; k++) {
647 s[0] = get_bits(gb, 4 + (sconf->resolution > 1));
648 for (k = 1; k < sub_blocks; k++)
649 s[k] = s[k - 1] + decode_rice(gb, 0);
651 for (k = 1; k < sub_blocks; k++)
653 av_log(avctx, AV_LOG_ERROR, "k invalid for rice code.\n");
654 return AVERROR_INVALIDDATA;
658 *bd->shift_lsbs = get_bits(gb, 4) + 1;
660 *bd->store_prev_samples = (bd->js_blocks && bd->raw_other) || *bd->shift_lsbs;
663 if (!sconf->rlslms) {
664 if (sconf->adapt_order) {
665 int opt_order_length = av_ceil_log2(av_clip((bd->block_length >> 3) - 1,
666 2, sconf->max_order + 1));
667 *bd->opt_order = get_bits(gb, opt_order_length);
668 if (*bd->opt_order > sconf->max_order) {
669 *bd->opt_order = sconf->max_order;
670 av_log(avctx, AV_LOG_ERROR, "Predictor order too large!\n");
671 return AVERROR_INVALIDDATA;
674 *bd->opt_order = sconf->max_order;
677 opt_order = *bd->opt_order;
682 if (sconf->coef_table == 3) {
685 // read coefficient 0
686 quant_cof[0] = 32 * parcor_scaled_values[get_bits(gb, 7)];
688 // read coefficient 1
690 quant_cof[1] = -32 * parcor_scaled_values[get_bits(gb, 7)];
692 // read coefficients 2 to opt_order
693 for (k = 2; k < opt_order; k++)
694 quant_cof[k] = get_bits(gb, 7);
699 // read coefficient 0 to 19
700 k_max = FFMIN(opt_order, 20);
701 for (k = 0; k < k_max; k++) {
702 int rice_param = parcor_rice_table[sconf->coef_table][k][1];
703 int offset = parcor_rice_table[sconf->coef_table][k][0];
704 quant_cof[k] = decode_rice(gb, rice_param) + offset;
705 if (quant_cof[k] < -64 || quant_cof[k] > 63) {
706 av_log(avctx, AV_LOG_ERROR, "quant_cof %d is out of range\n", quant_cof[k]);
707 return AVERROR_INVALIDDATA;
711 // read coefficients 20 to 126
712 k_max = FFMIN(opt_order, 127);
713 for (; k < k_max; k++)
714 quant_cof[k] = decode_rice(gb, 2) + (k & 1);
716 // read coefficients 127 to opt_order
717 for (; k < opt_order; k++)
718 quant_cof[k] = decode_rice(gb, 1);
720 quant_cof[0] = 32 * parcor_scaled_values[quant_cof[0] + 64];
723 quant_cof[1] = -32 * parcor_scaled_values[quant_cof[1] + 64];
726 for (k = 2; k < opt_order; k++)
727 quant_cof[k] = (quant_cof[k] << 14) + (add_base << 13);
731 // read LTP gain and lag values
732 if (sconf->long_term_prediction) {
733 *bd->use_ltp = get_bits1(gb);
738 bd->ltp_gain[0] = decode_rice(gb, 1) << 3;
739 bd->ltp_gain[1] = decode_rice(gb, 2) << 3;
741 r = get_unary(gb, 0, 3);
743 bd->ltp_gain[2] = ltp_gain_values[r][c];
745 bd->ltp_gain[3] = decode_rice(gb, 2) << 3;
746 bd->ltp_gain[4] = decode_rice(gb, 1) << 3;
748 *bd->ltp_lag = get_bits(gb, ctx->ltp_lag_length);
749 *bd->ltp_lag += FFMAX(4, opt_order + 1);
753 // read first value and residuals in case of a random access block
756 bd->raw_samples[0] = decode_rice(gb, avctx->bits_per_raw_sample - 4);
758 bd->raw_samples[1] = decode_rice(gb, FFMIN(s[0] + 3, ctx->s_max));
760 bd->raw_samples[2] = decode_rice(gb, FFMIN(s[0] + 1, ctx->s_max));
762 start = FFMIN(opt_order, 3);
765 // read all residuals
769 unsigned int b = av_clip((av_ceil_log2(bd->block_length) - 3) >> 1, 0, 5);
771 // read most significant bits
776 ff_bgmc_decode_init(gb, &high, &low, &value);
778 current_res = bd->raw_samples + start;
780 for (sb = 0; sb < sub_blocks; sb++) {
781 unsigned int sb_len = sb_length - (sb ? 0 : start);
783 k [sb] = s[sb] > b ? s[sb] - b : 0;
784 delta[sb] = 5 - s[sb] + k[sb];
786 ff_bgmc_decode(gb, sb_len, current_res,
787 delta[sb], sx[sb], &high, &low, &value, ctx->bgmc_lut, ctx->bgmc_lut_status);
789 current_res += sb_len;
792 ff_bgmc_decode_end(gb);
795 // read least significant bits and tails
796 current_res = bd->raw_samples + start;
798 for (sb = 0; sb < sub_blocks; sb++, start = 0) {
799 unsigned int cur_tail_code = tail_code[sx[sb]][delta[sb]];
800 unsigned int cur_k = k[sb];
801 unsigned int cur_s = s[sb];
803 for (; start < sb_length; start++) {
804 int32_t res = *current_res;
806 if (res == cur_tail_code) {
807 unsigned int max_msb = (2 + (sx[sb] > 2) + (sx[sb] > 10))
810 res = decode_rice(gb, cur_s);
813 res += (max_msb ) << cur_k;
815 res -= (max_msb - 1) << cur_k;
818 if (res > cur_tail_code)
828 res |= get_bits_long(gb, cur_k);
832 *current_res++ = res;
836 current_res = bd->raw_samples + start;
838 for (sb = 0; sb < sub_blocks; sb++, start = 0)
839 for (; start < sb_length; start++)
840 *current_res++ = decode_rice(gb, s[sb]);
843 if (!sconf->mc_coding || ctx->js_switch)
850 /** Decode the block data for a non-constant block
852 static int decode_var_block_data(ALSDecContext *ctx, ALSBlockData *bd)
854 ALSSpecificConfig *sconf = &ctx->sconf;
855 unsigned int block_length = bd->block_length;
856 unsigned int smp = 0;
858 int opt_order = *bd->opt_order;
861 int32_t *quant_cof = bd->quant_cof;
862 int32_t *lpc_cof = bd->lpc_cof;
863 int32_t *raw_samples = bd->raw_samples;
864 int32_t *raw_samples_end = bd->raw_samples + bd->block_length;
865 int32_t *lpc_cof_reversed = ctx->lpc_cof_reversed_buffer;
867 // reverse long-term prediction
871 for (ltp_smp = FFMAX(*bd->ltp_lag - 2, 0); ltp_smp < block_length; ltp_smp++) {
872 int center = ltp_smp - *bd->ltp_lag;
873 int begin = FFMAX(0, center - 2);
874 int end = center + 3;
875 int tab = 5 - (end - begin);
880 for (base = begin; base < end; base++, tab++)
881 y += MUL64(bd->ltp_gain[tab], raw_samples[base]);
883 raw_samples[ltp_smp] += y >> 7;
887 // reconstruct all samples from residuals
889 for (smp = 0; smp < opt_order; smp++) {
892 for (sb = 0; sb < smp; sb++)
893 y += MUL64(lpc_cof[sb], raw_samples[-(sb + 1)]);
895 *raw_samples++ -= y >> 20;
896 parcor_to_lpc(smp, quant_cof, lpc_cof);
899 for (k = 0; k < opt_order; k++)
900 parcor_to_lpc(k, quant_cof, lpc_cof);
902 // store previous samples in case that they have to be altered
903 if (*bd->store_prev_samples)
904 memcpy(bd->prev_raw_samples, raw_samples - sconf->max_order,
905 sizeof(*bd->prev_raw_samples) * sconf->max_order);
907 // reconstruct difference signal for prediction (joint-stereo)
908 if (bd->js_blocks && bd->raw_other) {
909 int32_t *left, *right;
911 if (bd->raw_other > raw_samples) { // D = R - L
913 right = bd->raw_other;
914 } else { // D = R - L
915 left = bd->raw_other;
919 for (sb = -1; sb >= -sconf->max_order; sb--)
920 raw_samples[sb] = right[sb] - left[sb];
923 // reconstruct shifted signal
925 for (sb = -1; sb >= -sconf->max_order; sb--)
926 raw_samples[sb] >>= *bd->shift_lsbs;
929 // reverse linear prediction coefficients for efficiency
930 lpc_cof = lpc_cof + opt_order;
932 for (sb = 0; sb < opt_order; sb++)
933 lpc_cof_reversed[sb] = lpc_cof[-(sb + 1)];
935 // reconstruct raw samples
936 raw_samples = bd->raw_samples + smp;
937 lpc_cof = lpc_cof_reversed + opt_order;
939 for (; raw_samples < raw_samples_end; raw_samples++) {
942 for (sb = -opt_order; sb < 0; sb++)
943 y += MUL64(lpc_cof[sb], raw_samples[sb]);
945 *raw_samples -= y >> 20;
948 raw_samples = bd->raw_samples;
950 // restore previous samples in case that they have been altered
951 if (*bd->store_prev_samples)
952 memcpy(raw_samples - sconf->max_order, bd->prev_raw_samples,
953 sizeof(*raw_samples) * sconf->max_order);
959 /** Read the block data.
961 static int read_block(ALSDecContext *ctx, ALSBlockData *bd)
964 GetBitContext *gb = &ctx->gb;
967 // read block type flag and read the samples accordingly
969 ret = read_var_block_data(ctx, bd);
971 read_const_block_data(ctx, bd);
978 /** Decode the block data.
980 static int decode_block(ALSDecContext *ctx, ALSBlockData *bd)
985 // read block type flag and read the samples accordingly
986 if (*bd->const_block)
987 decode_const_block_data(ctx, bd);
989 ret = decode_var_block_data(ctx, bd); // always return 0
994 // TODO: read RLSLMS extension data
997 for (smp = 0; smp < bd->block_length; smp++)
998 bd->raw_samples[smp] <<= *bd->shift_lsbs;
1004 /** Read and decode block data successively.
1006 static int read_decode_block(ALSDecContext *ctx, ALSBlockData *bd)
1010 if ((ret = read_block(ctx, bd)) < 0)
1013 return decode_block(ctx, bd);
1017 /** Compute the number of samples left to decode for the current frame and
1018 * sets these samples to zero.
1020 static void zero_remaining(unsigned int b, unsigned int b_max,
1021 const unsigned int *div_blocks, int32_t *buf)
1023 unsigned int count = 0;
1025 for (; b < b_max; b++)
1026 count += div_blocks[b];
1029 memset(buf, 0, sizeof(*buf) * count);
1033 /** Decode blocks independently.
1035 static int decode_blocks_ind(ALSDecContext *ctx, unsigned int ra_frame,
1036 unsigned int c, const unsigned int *div_blocks,
1037 unsigned int *js_blocks)
1041 ALSBlockData bd = { 0 };
1043 bd.ra_block = ra_frame;
1044 bd.const_block = ctx->const_block;
1045 bd.shift_lsbs = ctx->shift_lsbs;
1046 bd.opt_order = ctx->opt_order;
1047 bd.store_prev_samples = ctx->store_prev_samples;
1048 bd.use_ltp = ctx->use_ltp;
1049 bd.ltp_lag = ctx->ltp_lag;
1050 bd.ltp_gain = ctx->ltp_gain[0];
1051 bd.quant_cof = ctx->quant_cof[0];
1052 bd.lpc_cof = ctx->lpc_cof[0];
1053 bd.prev_raw_samples = ctx->prev_raw_samples;
1054 bd.raw_samples = ctx->raw_samples[c];
1057 for (b = 0; b < ctx->num_blocks; b++) {
1058 bd.block_length = div_blocks[b];
1060 if ((ret = read_decode_block(ctx, &bd)) < 0) {
1061 // damaged block, write zero for the rest of the frame
1062 zero_remaining(b, ctx->num_blocks, div_blocks, bd.raw_samples);
1065 bd.raw_samples += div_blocks[b];
1073 /** Decode blocks dependently.
1075 static int decode_blocks(ALSDecContext *ctx, unsigned int ra_frame,
1076 unsigned int c, const unsigned int *div_blocks,
1077 unsigned int *js_blocks)
1079 ALSSpecificConfig *sconf = &ctx->sconf;
1080 unsigned int offset = 0;
1083 ALSBlockData bd[2] = { { 0 } };
1085 bd[0].ra_block = ra_frame;
1086 bd[0].const_block = ctx->const_block;
1087 bd[0].shift_lsbs = ctx->shift_lsbs;
1088 bd[0].opt_order = ctx->opt_order;
1089 bd[0].store_prev_samples = ctx->store_prev_samples;
1090 bd[0].use_ltp = ctx->use_ltp;
1091 bd[0].ltp_lag = ctx->ltp_lag;
1092 bd[0].ltp_gain = ctx->ltp_gain[0];
1093 bd[0].quant_cof = ctx->quant_cof[0];
1094 bd[0].lpc_cof = ctx->lpc_cof[0];
1095 bd[0].prev_raw_samples = ctx->prev_raw_samples;
1096 bd[0].js_blocks = *js_blocks;
1098 bd[1].ra_block = ra_frame;
1099 bd[1].const_block = ctx->const_block;
1100 bd[1].shift_lsbs = ctx->shift_lsbs;
1101 bd[1].opt_order = ctx->opt_order;
1102 bd[1].store_prev_samples = ctx->store_prev_samples;
1103 bd[1].use_ltp = ctx->use_ltp;
1104 bd[1].ltp_lag = ctx->ltp_lag;
1105 bd[1].ltp_gain = ctx->ltp_gain[0];
1106 bd[1].quant_cof = ctx->quant_cof[0];
1107 bd[1].lpc_cof = ctx->lpc_cof[0];
1108 bd[1].prev_raw_samples = ctx->prev_raw_samples;
1109 bd[1].js_blocks = *(js_blocks + 1);
1111 // decode all blocks
1112 for (b = 0; b < ctx->num_blocks; b++) {
1115 bd[0].block_length = div_blocks[b];
1116 bd[1].block_length = div_blocks[b];
1118 bd[0].raw_samples = ctx->raw_samples[c ] + offset;
1119 bd[1].raw_samples = ctx->raw_samples[c + 1] + offset;
1121 bd[0].raw_other = bd[1].raw_samples;
1122 bd[1].raw_other = bd[0].raw_samples;
1124 if ((ret = read_decode_block(ctx, &bd[0])) < 0 ||
1125 (ret = read_decode_block(ctx, &bd[1])) < 0)
1128 // reconstruct joint-stereo blocks
1129 if (bd[0].js_blocks) {
1130 if (bd[1].js_blocks)
1131 av_log(ctx->avctx, AV_LOG_WARNING, "Invalid channel pair!\n");
1133 for (s = 0; s < div_blocks[b]; s++)
1134 bd[0].raw_samples[s] = bd[1].raw_samples[s] - bd[0].raw_samples[s];
1135 } else if (bd[1].js_blocks) {
1136 for (s = 0; s < div_blocks[b]; s++)
1137 bd[1].raw_samples[s] = bd[1].raw_samples[s] + bd[0].raw_samples[s];
1140 offset += div_blocks[b];
1145 // store carryover raw samples,
1146 // the others channel raw samples are stored by the calling function.
1147 memmove(ctx->raw_samples[c] - sconf->max_order,
1148 ctx->raw_samples[c] - sconf->max_order + sconf->frame_length,
1149 sizeof(*ctx->raw_samples[c]) * sconf->max_order);
1153 // damaged block, write zero for the rest of the frame
1154 zero_remaining(b, ctx->num_blocks, div_blocks, bd[0].raw_samples);
1155 zero_remaining(b, ctx->num_blocks, div_blocks, bd[1].raw_samples);
1159 static inline int als_weighting(GetBitContext *gb, int k, int off)
1161 int idx = av_clip(decode_rice(gb, k) + off,
1162 0, FF_ARRAY_ELEMS(mcc_weightings) - 1);
1163 return mcc_weightings[idx];
1166 /** Read the channel data.
1168 static int read_channel_data(ALSDecContext *ctx, ALSChannelData *cd, int c)
1170 GetBitContext *gb = &ctx->gb;
1171 ALSChannelData *current = cd;
1172 unsigned int channels = ctx->avctx->channels;
1175 while (entries < channels && !(current->stop_flag = get_bits1(gb))) {
1176 current->master_channel = get_bits_long(gb, av_ceil_log2(channels));
1178 if (current->master_channel >= channels) {
1179 av_log(ctx->avctx, AV_LOG_ERROR, "Invalid master channel!\n");
1180 return AVERROR_INVALIDDATA;
1183 if (current->master_channel != c) {
1184 current->time_diff_flag = get_bits1(gb);
1185 current->weighting[0] = als_weighting(gb, 1, 16);
1186 current->weighting[1] = als_weighting(gb, 2, 14);
1187 current->weighting[2] = als_weighting(gb, 1, 16);
1189 if (current->time_diff_flag) {
1190 current->weighting[3] = als_weighting(gb, 1, 16);
1191 current->weighting[4] = als_weighting(gb, 1, 16);
1192 current->weighting[5] = als_weighting(gb, 1, 16);
1194 current->time_diff_sign = get_bits1(gb);
1195 current->time_diff_index = get_bits(gb, ctx->ltp_lag_length - 3) + 3;
1203 if (entries == channels) {
1204 av_log(ctx->avctx, AV_LOG_ERROR, "Damaged channel data!\n");
1205 return AVERROR_INVALIDDATA;
1213 /** Recursively reverts the inter-channel correlation for a block.
1215 static int revert_channel_correlation(ALSDecContext *ctx, ALSBlockData *bd,
1216 ALSChannelData **cd, int *reverted,
1217 unsigned int offset, int c)
1219 ALSChannelData *ch = cd[c];
1220 unsigned int dep = 0;
1221 unsigned int channels = ctx->avctx->channels;
1228 while (dep < channels && !ch[dep].stop_flag) {
1229 revert_channel_correlation(ctx, bd, cd, reverted, offset,
1230 ch[dep].master_channel);
1235 if (dep == channels) {
1236 av_log(ctx->avctx, AV_LOG_WARNING, "Invalid channel correlation!\n");
1237 return AVERROR_INVALIDDATA;
1240 bd->const_block = ctx->const_block + c;
1241 bd->shift_lsbs = ctx->shift_lsbs + c;
1242 bd->opt_order = ctx->opt_order + c;
1243 bd->store_prev_samples = ctx->store_prev_samples + c;
1244 bd->use_ltp = ctx->use_ltp + c;
1245 bd->ltp_lag = ctx->ltp_lag + c;
1246 bd->ltp_gain = ctx->ltp_gain[c];
1247 bd->lpc_cof = ctx->lpc_cof[c];
1248 bd->quant_cof = ctx->quant_cof[c];
1249 bd->raw_samples = ctx->raw_samples[c] + offset;
1252 while (!ch[dep].stop_flag) {
1254 unsigned int begin = 1;
1255 unsigned int end = bd->block_length - 1;
1257 int32_t *master = ctx->raw_samples[ch[dep].master_channel] + offset;
1259 if (ch[dep].time_diff_flag) {
1260 int t = ch[dep].time_diff_index;
1262 if (ch[dep].time_diff_sign) {
1269 for (smp = begin; smp < end; smp++) {
1271 MUL64(ch[dep].weighting[0], master[smp - 1 ]) +
1272 MUL64(ch[dep].weighting[1], master[smp ]) +
1273 MUL64(ch[dep].weighting[2], master[smp + 1 ]) +
1274 MUL64(ch[dep].weighting[3], master[smp - 1 + t]) +
1275 MUL64(ch[dep].weighting[4], master[smp + t]) +
1276 MUL64(ch[dep].weighting[5], master[smp + 1 + t]);
1278 bd->raw_samples[smp] += y >> 7;
1281 for (smp = begin; smp < end; smp++) {
1283 MUL64(ch[dep].weighting[0], master[smp - 1]) +
1284 MUL64(ch[dep].weighting[1], master[smp ]) +
1285 MUL64(ch[dep].weighting[2], master[smp + 1]);
1287 bd->raw_samples[smp] += y >> 7;
1298 /** Read the frame data.
1300 static int read_frame_data(ALSDecContext *ctx, unsigned int ra_frame)
1302 ALSSpecificConfig *sconf = &ctx->sconf;
1303 AVCodecContext *avctx = ctx->avctx;
1304 GetBitContext *gb = &ctx->gb;
1305 unsigned int div_blocks[32]; ///< block sizes.
1307 unsigned int js_blocks[2];
1308 uint32_t bs_info = 0;
1311 // skip the size of the ra unit if present in the frame
1312 if (sconf->ra_flag == RA_FLAG_FRAMES && ra_frame)
1313 skip_bits_long(gb, 32);
1315 if (sconf->mc_coding && sconf->joint_stereo) {
1316 ctx->js_switch = get_bits1(gb);
1320 if (!sconf->mc_coding || ctx->js_switch) {
1321 int independent_bs = !sconf->joint_stereo;
1323 for (c = 0; c < avctx->channels; c++) {
1327 get_block_sizes(ctx, div_blocks, &bs_info);
1329 // if joint_stereo and block_switching is set, independent decoding
1330 // is signaled via the first bit of bs_info
1331 if (sconf->joint_stereo && sconf->block_switching)
1335 // if this is the last channel, it has to be decoded independently
1336 if (c == avctx->channels - 1)
1339 if (independent_bs) {
1340 ret = decode_blocks_ind(ctx, ra_frame, c,
1341 div_blocks, js_blocks);
1346 ret = decode_blocks(ctx, ra_frame, c, div_blocks, js_blocks);
1353 // store carryover raw samples
1354 memmove(ctx->raw_samples[c] - sconf->max_order,
1355 ctx->raw_samples[c] - sconf->max_order + sconf->frame_length,
1356 sizeof(*ctx->raw_samples[c]) * sconf->max_order);
1358 } else { // multi-channel coding
1359 ALSBlockData bd = { 0 };
1361 int *reverted_channels = ctx->reverted_channels;
1362 unsigned int offset = 0;
1364 for (c = 0; c < avctx->channels; c++)
1365 if (ctx->chan_data[c] < ctx->chan_data_buffer) {
1366 av_log(ctx->avctx, AV_LOG_ERROR, "Invalid channel data!\n");
1367 return AVERROR_INVALIDDATA;
1370 memset(reverted_channels, 0, sizeof(*reverted_channels) * avctx->channels);
1372 bd.ra_block = ra_frame;
1373 bd.prev_raw_samples = ctx->prev_raw_samples;
1375 get_block_sizes(ctx, div_blocks, &bs_info);
1377 for (b = 0; b < ctx->num_blocks; b++) {
1378 bd.block_length = div_blocks[b];
1380 for (c = 0; c < avctx->channels; c++) {
1381 bd.const_block = ctx->const_block + c;
1382 bd.shift_lsbs = ctx->shift_lsbs + c;
1383 bd.opt_order = ctx->opt_order + c;
1384 bd.store_prev_samples = ctx->store_prev_samples + c;
1385 bd.use_ltp = ctx->use_ltp + c;
1386 bd.ltp_lag = ctx->ltp_lag + c;
1387 bd.ltp_gain = ctx->ltp_gain[c];
1388 bd.lpc_cof = ctx->lpc_cof[c];
1389 bd.quant_cof = ctx->quant_cof[c];
1390 bd.raw_samples = ctx->raw_samples[c] + offset;
1391 bd.raw_other = NULL;
1393 if ((ret = read_block(ctx, &bd)) < 0)
1395 if ((ret = read_channel_data(ctx, ctx->chan_data[c], c)) < 0)
1399 for (c = 0; c < avctx->channels; c++) {
1400 ret = revert_channel_correlation(ctx, &bd, ctx->chan_data,
1401 reverted_channels, offset, c);
1405 for (c = 0; c < avctx->channels; c++) {
1406 bd.const_block = ctx->const_block + c;
1407 bd.shift_lsbs = ctx->shift_lsbs + c;
1408 bd.opt_order = ctx->opt_order + c;
1409 bd.store_prev_samples = ctx->store_prev_samples + c;
1410 bd.use_ltp = ctx->use_ltp + c;
1411 bd.ltp_lag = ctx->ltp_lag + c;
1412 bd.ltp_gain = ctx->ltp_gain[c];
1413 bd.lpc_cof = ctx->lpc_cof[c];
1414 bd.quant_cof = ctx->quant_cof[c];
1415 bd.raw_samples = ctx->raw_samples[c] + offset;
1416 if ((ret = decode_block(ctx, &bd)) < 0)
1420 memset(reverted_channels, 0, avctx->channels * sizeof(*reverted_channels));
1421 offset += div_blocks[b];
1425 // store carryover raw samples
1426 for (c = 0; c < avctx->channels; c++)
1427 memmove(ctx->raw_samples[c] - sconf->max_order,
1428 ctx->raw_samples[c] - sconf->max_order + sconf->frame_length,
1429 sizeof(*ctx->raw_samples[c]) * sconf->max_order);
1432 // TODO: read_diff_float_data
1438 /** Decode an ALS frame.
1440 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame_ptr,
1443 ALSDecContext *ctx = avctx->priv_data;
1444 AVFrame *frame = data;
1445 ALSSpecificConfig *sconf = &ctx->sconf;
1446 const uint8_t *buffer = avpkt->data;
1447 int buffer_size = avpkt->size;
1448 int invalid_frame, ret;
1449 unsigned int c, sample, ra_frame, bytes_read, shift;
1451 init_get_bits(&ctx->gb, buffer, buffer_size * 8);
1453 // In the case that the distance between random access frames is set to zero
1454 // (sconf->ra_distance == 0) no frame is treated as a random access frame.
1455 // For the first frame, if prediction is used, all samples used from the
1456 // previous frame are assumed to be zero.
1457 ra_frame = sconf->ra_distance && !(ctx->frame_id % sconf->ra_distance);
1459 // the last frame to decode might have a different length
1460 if (sconf->samples != 0xFFFFFFFF)
1461 ctx->cur_frame_length = FFMIN(sconf->samples - ctx->frame_id * (uint64_t) sconf->frame_length,
1462 sconf->frame_length);
1464 ctx->cur_frame_length = sconf->frame_length;
1466 // decode the frame data
1467 if ((invalid_frame = read_frame_data(ctx, ra_frame)) < 0)
1468 av_log(ctx->avctx, AV_LOG_WARNING,
1469 "Reading frame data failed. Skipping RA unit.\n");
1473 /* get output buffer */
1474 frame->nb_samples = ctx->cur_frame_length;
1475 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {
1476 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
1480 // transform decoded frame into output format
1481 #define INTERLEAVE_OUTPUT(bps) \
1483 int##bps##_t *dest = (int##bps##_t*)frame->data[0]; \
1484 shift = bps - ctx->avctx->bits_per_raw_sample; \
1485 for (sample = 0; sample < ctx->cur_frame_length; sample++) \
1486 for (c = 0; c < avctx->channels; c++) \
1487 *dest++ = ctx->raw_samples[c][sample] << shift; \
1490 if (ctx->avctx->bits_per_raw_sample <= 16) {
1491 INTERLEAVE_OUTPUT(16)
1493 INTERLEAVE_OUTPUT(32)
1497 if (sconf->crc_enabled && (avctx->err_recognition & AV_EF_CRCCHECK)) {
1498 int swap = HAVE_BIGENDIAN != sconf->msb_first;
1500 if (ctx->avctx->bits_per_raw_sample == 24) {
1501 int32_t *src = (int32_t *)frame->data[0];
1504 sample < ctx->cur_frame_length * avctx->channels;
1509 v = av_bswap32(src[sample]);
1512 if (!HAVE_BIGENDIAN)
1515 ctx->crc = av_crc(ctx->crc_table, ctx->crc, (uint8_t*)(&v), 3);
1518 uint8_t *crc_source;
1521 if (ctx->avctx->bits_per_raw_sample <= 16) {
1522 int16_t *src = (int16_t*) frame->data[0];
1523 int16_t *dest = (int16_t*) ctx->crc_buffer;
1525 sample < ctx->cur_frame_length * avctx->channels;
1527 *dest++ = av_bswap16(src[sample]);
1529 ctx->dsp.bswap_buf((uint32_t*)ctx->crc_buffer,
1530 (uint32_t *)frame->data[0],
1531 ctx->cur_frame_length * avctx->channels);
1533 crc_source = ctx->crc_buffer;
1535 crc_source = frame->data[0];
1538 ctx->crc = av_crc(ctx->crc_table, ctx->crc, crc_source,
1539 ctx->cur_frame_length * avctx->channels *
1540 av_get_bytes_per_sample(avctx->sample_fmt));
1544 // check CRC sums if this is the last frame
1545 if (ctx->cur_frame_length != sconf->frame_length &&
1546 ctx->crc_org != ctx->crc) {
1547 av_log(avctx, AV_LOG_ERROR, "CRC error.\n");
1553 bytes_read = invalid_frame ? buffer_size :
1554 (get_bits_count(&ctx->gb) + 7) >> 3;
1560 /** Uninitialize the ALS decoder.
1562 static av_cold int decode_end(AVCodecContext *avctx)
1564 ALSDecContext *ctx = avctx->priv_data;
1566 av_freep(&ctx->sconf.chan_pos);
1568 ff_bgmc_end(&ctx->bgmc_lut, &ctx->bgmc_lut_status);
1570 av_freep(&ctx->const_block);
1571 av_freep(&ctx->shift_lsbs);
1572 av_freep(&ctx->opt_order);
1573 av_freep(&ctx->store_prev_samples);
1574 av_freep(&ctx->use_ltp);
1575 av_freep(&ctx->ltp_lag);
1576 av_freep(&ctx->ltp_gain);
1577 av_freep(&ctx->ltp_gain_buffer);
1578 av_freep(&ctx->quant_cof);
1579 av_freep(&ctx->lpc_cof);
1580 av_freep(&ctx->quant_cof_buffer);
1581 av_freep(&ctx->lpc_cof_buffer);
1582 av_freep(&ctx->lpc_cof_reversed_buffer);
1583 av_freep(&ctx->prev_raw_samples);
1584 av_freep(&ctx->raw_samples);
1585 av_freep(&ctx->raw_buffer);
1586 av_freep(&ctx->chan_data);
1587 av_freep(&ctx->chan_data_buffer);
1588 av_freep(&ctx->reverted_channels);
1589 av_freep(&ctx->crc_buffer);
1595 /** Initialize the ALS decoder.
1597 static av_cold int decode_init(AVCodecContext *avctx)
1600 unsigned int channel_size;
1601 int num_buffers, ret;
1602 ALSDecContext *ctx = avctx->priv_data;
1603 ALSSpecificConfig *sconf = &ctx->sconf;
1606 if (!avctx->extradata) {
1607 av_log(avctx, AV_LOG_ERROR, "Missing required ALS extradata.\n");
1608 return AVERROR_INVALIDDATA;
1611 if ((ret = read_specific_config(ctx)) < 0) {
1612 av_log(avctx, AV_LOG_ERROR, "Reading ALSSpecificConfig failed.\n");
1616 if ((ret = check_specific_config(ctx)) < 0) {
1621 ret = ff_bgmc_init(avctx, &ctx->bgmc_lut, &ctx->bgmc_lut_status);
1625 if (sconf->floating) {
1626 avctx->sample_fmt = AV_SAMPLE_FMT_FLT;
1627 avctx->bits_per_raw_sample = 32;
1629 avctx->sample_fmt = sconf->resolution > 1
1630 ? AV_SAMPLE_FMT_S32 : AV_SAMPLE_FMT_S16;
1631 avctx->bits_per_raw_sample = (sconf->resolution + 1) * 8;
1634 // set maximum Rice parameter for progressive decoding based on resolution
1635 // This is not specified in 14496-3 but actually done by the reference
1636 // codec RM22 revision 2.
1637 ctx->s_max = sconf->resolution > 1 ? 31 : 15;
1639 // set lag value for long-term prediction
1640 ctx->ltp_lag_length = 8 + (avctx->sample_rate >= 96000) +
1641 (avctx->sample_rate >= 192000);
1643 // allocate quantized parcor coefficient buffer
1644 num_buffers = sconf->mc_coding ? avctx->channels : 1;
1646 ctx->quant_cof = av_malloc(sizeof(*ctx->quant_cof) * num_buffers);
1647 ctx->lpc_cof = av_malloc(sizeof(*ctx->lpc_cof) * num_buffers);
1648 ctx->quant_cof_buffer = av_malloc(sizeof(*ctx->quant_cof_buffer) *
1649 num_buffers * sconf->max_order);
1650 ctx->lpc_cof_buffer = av_malloc(sizeof(*ctx->lpc_cof_buffer) *
1651 num_buffers * sconf->max_order);
1652 ctx->lpc_cof_reversed_buffer = av_malloc(sizeof(*ctx->lpc_cof_buffer) *
1655 if (!ctx->quant_cof || !ctx->lpc_cof ||
1656 !ctx->quant_cof_buffer || !ctx->lpc_cof_buffer ||
1657 !ctx->lpc_cof_reversed_buffer) {
1658 av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
1659 ret = AVERROR(ENOMEM);
1663 // assign quantized parcor coefficient buffers
1664 for (c = 0; c < num_buffers; c++) {
1665 ctx->quant_cof[c] = ctx->quant_cof_buffer + c * sconf->max_order;
1666 ctx->lpc_cof[c] = ctx->lpc_cof_buffer + c * sconf->max_order;
1669 // allocate and assign lag and gain data buffer for ltp mode
1670 ctx->const_block = av_malloc (sizeof(*ctx->const_block) * num_buffers);
1671 ctx->shift_lsbs = av_malloc (sizeof(*ctx->shift_lsbs) * num_buffers);
1672 ctx->opt_order = av_malloc (sizeof(*ctx->opt_order) * num_buffers);
1673 ctx->store_prev_samples = av_malloc(sizeof(*ctx->store_prev_samples) * num_buffers);
1674 ctx->use_ltp = av_mallocz(sizeof(*ctx->use_ltp) * num_buffers);
1675 ctx->ltp_lag = av_malloc (sizeof(*ctx->ltp_lag) * num_buffers);
1676 ctx->ltp_gain = av_malloc (sizeof(*ctx->ltp_gain) * num_buffers);
1677 ctx->ltp_gain_buffer = av_malloc (sizeof(*ctx->ltp_gain_buffer) *
1680 if (!ctx->const_block || !ctx->shift_lsbs ||
1681 !ctx->opt_order || !ctx->store_prev_samples ||
1682 !ctx->use_ltp || !ctx->ltp_lag ||
1683 !ctx->ltp_gain || !ctx->ltp_gain_buffer) {
1684 av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
1685 ret = AVERROR(ENOMEM);
1689 for (c = 0; c < num_buffers; c++)
1690 ctx->ltp_gain[c] = ctx->ltp_gain_buffer + c * 5;
1692 // allocate and assign channel data buffer for mcc mode
1693 if (sconf->mc_coding) {
1694 ctx->chan_data_buffer = av_malloc(sizeof(*ctx->chan_data_buffer) *
1695 num_buffers * num_buffers);
1696 ctx->chan_data = av_malloc(sizeof(*ctx->chan_data) *
1698 ctx->reverted_channels = av_malloc(sizeof(*ctx->reverted_channels) *
1701 if (!ctx->chan_data_buffer || !ctx->chan_data || !ctx->reverted_channels) {
1702 av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
1703 ret = AVERROR(ENOMEM);
1707 for (c = 0; c < num_buffers; c++)
1708 ctx->chan_data[c] = ctx->chan_data_buffer + c * num_buffers;
1710 ctx->chan_data = NULL;
1711 ctx->chan_data_buffer = NULL;
1712 ctx->reverted_channels = NULL;
1715 channel_size = sconf->frame_length + sconf->max_order;
1717 ctx->prev_raw_samples = av_malloc (sizeof(*ctx->prev_raw_samples) * sconf->max_order);
1718 ctx->raw_buffer = av_mallocz(sizeof(*ctx-> raw_buffer) * avctx->channels * channel_size);
1719 ctx->raw_samples = av_malloc (sizeof(*ctx-> raw_samples) * avctx->channels);
1721 // allocate previous raw sample buffer
1722 if (!ctx->prev_raw_samples || !ctx->raw_buffer|| !ctx->raw_samples) {
1723 av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
1724 ret = AVERROR(ENOMEM);
1728 // assign raw samples buffers
1729 ctx->raw_samples[0] = ctx->raw_buffer + sconf->max_order;
1730 for (c = 1; c < avctx->channels; c++)
1731 ctx->raw_samples[c] = ctx->raw_samples[c - 1] + channel_size;
1733 // allocate crc buffer
1734 if (HAVE_BIGENDIAN != sconf->msb_first && sconf->crc_enabled &&
1735 (avctx->err_recognition & AV_EF_CRCCHECK)) {
1736 ctx->crc_buffer = av_malloc(sizeof(*ctx->crc_buffer) *
1737 ctx->cur_frame_length *
1739 av_get_bytes_per_sample(avctx->sample_fmt));
1740 if (!ctx->crc_buffer) {
1741 av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
1742 ret = AVERROR(ENOMEM);
1747 ff_dsputil_init(&ctx->dsp, avctx);
1757 /** Flush (reset) the frame ID after seeking.
1759 static av_cold void flush(AVCodecContext *avctx)
1761 ALSDecContext *ctx = avctx->priv_data;
1767 AVCodec ff_als_decoder = {
1769 .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 Audio Lossless Coding (ALS)"),
1770 .type = AVMEDIA_TYPE_AUDIO,
1771 .id = AV_CODEC_ID_MP4ALS,
1772 .priv_data_size = sizeof(ALSDecContext),
1773 .init = decode_init,
1774 .close = decode_end,
1775 .decode = decode_frame,
1777 .capabilities = CODEC_CAP_SUBFRAMES | CODEC_CAP_DR1,