3 * Copyright (c) 2009 Thilo Borgmann <thilo.borgmann _at_ googlemail.com>
5 * This file is part of FFmpeg.
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.
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.
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
25 * @author Thilo Borgmann <thilo.borgmann _at_ googlemail.com>
35 #include "mpeg4audio.h"
36 #include "bytestream.h"
39 #include "libavutil/crc.h"
43 /** Rice parameters and corresponding index offsets for decoding the
44 * indices of scaled PARCOR values. The table choosen is set globally
45 * by the encoder and stored in ALSSpecificConfig.
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} }
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.
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
104 /** Gain values of p(0) for long-term prediction.
105 * To be indexed by the Rice coded indices.
107 static const uint8_t ltp_gain_values [4][4] = {
115 /** Inter-channel weighting factors for multi-channel correlation.
116 * To be indexed by the Rice coded indices.
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
126 /** Tail codes used in arithmetic coding using block Gilbert-Moore codes.
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}
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
192 AVCodecContext *avctx;
193 ALSSpecificConfig sconf;
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 num_blocks; ///< number of blocks used in the current frame
203 unsigned int s_max; ///< maximum Rice parameter allowed in entropy coding
204 uint8_t *bgmc_lut; ///< pointer at lookup tables used for BGMC
205 unsigned int *bgmc_lut_status; ///< pointer at lookup table status flags used for BGMC
206 int ltp_lag_length; ///< number of bits used for ltp lag value
207 int *use_ltp; ///< contains use_ltp flags for all channels
208 int *ltp_lag; ///< contains ltp lag values for all channels
209 int **ltp_gain; ///< gain values for ltp 5-tap filter for a channel
210 int *ltp_gain_buffer; ///< contains all gain values for ltp 5-tap filter
211 int32_t **quant_cof; ///< quantized parcor coefficients for a channel
212 int32_t *quant_cof_buffer; ///< contains all quantized parcor coefficients
213 int32_t **lpc_cof; ///< coefficients of the direct form prediction filter for a channel
214 int32_t *lpc_cof_buffer; ///< contains all coefficients of the direct form prediction filter
215 int32_t *lpc_cof_reversed_buffer; ///< temporary buffer to set up a reversed versio of lpc_cof_buffer
216 ALSChannelData **chan_data; ///< channel data for multi-channel correlation
217 ALSChannelData *chan_data_buffer; ///< contains channel data for all channels
218 int *reverted_channels; ///< stores a flag for each reverted channel
219 int32_t *prev_raw_samples; ///< contains unshifted raw samples from the previous block
220 int32_t **raw_samples; ///< decoded raw samples for each channel
221 int32_t *raw_buffer; ///< contains all decoded raw samples including carryover samples
222 uint8_t *crc_buffer; ///< buffer of byte order corrected samples used for CRC check
227 unsigned int block_length; ///< number of samples within the block
228 unsigned int ra_block; ///< if true, this is a random access block
229 int const_block; ///< if true, this is a constant value block
230 int32_t const_val; ///< the sample value of a constant block
231 int js_blocks; ///< true if this block contains a difference signal
232 unsigned int shift_lsbs; ///< shift of values for this block
233 unsigned int opt_order; ///< prediction order of this block
234 int store_prev_samples;///< if true, carryover samples have to be stored
235 int *use_ltp; ///< if true, long-term prediction is used
236 int *ltp_lag; ///< lag value for long-term prediction
237 int *ltp_gain; ///< gain values for ltp 5-tap filter
238 int32_t *quant_cof; ///< quantized parcor coefficients
239 int32_t *lpc_cof; ///< coefficients of the direct form prediction
240 int32_t *raw_samples; ///< decoded raw samples / residuals for this block
241 int32_t *prev_raw_samples; ///< contains unshifted raw samples from the previous block
242 int32_t *raw_other; ///< decoded raw samples of the other channel of a channel pair
246 static av_cold void dprint_specific_config(ALSDecContext *ctx)
249 AVCodecContext *avctx = ctx->avctx;
250 ALSSpecificConfig *sconf = &ctx->sconf;
252 dprintf(avctx, "resolution = %i\n", sconf->resolution);
253 dprintf(avctx, "floating = %i\n", sconf->floating);
254 dprintf(avctx, "frame_length = %i\n", sconf->frame_length);
255 dprintf(avctx, "ra_distance = %i\n", sconf->ra_distance);
256 dprintf(avctx, "ra_flag = %i\n", sconf->ra_flag);
257 dprintf(avctx, "adapt_order = %i\n", sconf->adapt_order);
258 dprintf(avctx, "coef_table = %i\n", sconf->coef_table);
259 dprintf(avctx, "long_term_prediction = %i\n", sconf->long_term_prediction);
260 dprintf(avctx, "max_order = %i\n", sconf->max_order);
261 dprintf(avctx, "block_switching = %i\n", sconf->block_switching);
262 dprintf(avctx, "bgmc = %i\n", sconf->bgmc);
263 dprintf(avctx, "sb_part = %i\n", sconf->sb_part);
264 dprintf(avctx, "joint_stereo = %i\n", sconf->joint_stereo);
265 dprintf(avctx, "mc_coding = %i\n", sconf->mc_coding);
266 dprintf(avctx, "chan_config = %i\n", sconf->chan_config);
267 dprintf(avctx, "chan_sort = %i\n", sconf->chan_sort);
268 dprintf(avctx, "RLSLMS = %i\n", sconf->rlslms);
269 dprintf(avctx, "chan_config_info = %i\n", sconf->chan_config_info);
274 /** Read an ALSSpecificConfig from a buffer into the output struct.
276 static av_cold int read_specific_config(ALSDecContext *ctx)
280 int i, config_offset;
281 MPEG4AudioConfig m4ac;
282 ALSSpecificConfig *sconf = &ctx->sconf;
283 AVCodecContext *avctx = ctx->avctx;
284 uint32_t als_id, header_size, trailer_size;
286 init_get_bits(&gb, avctx->extradata, avctx->extradata_size * 8);
288 config_offset = ff_mpeg4audio_get_config(&m4ac, avctx->extradata,
289 avctx->extradata_size);
291 if (config_offset < 0)
294 skip_bits_long(&gb, config_offset);
296 if (get_bits_left(&gb) < (30 << 3))
299 // read the fixed items
300 als_id = get_bits_long(&gb, 32);
301 avctx->sample_rate = m4ac.sample_rate;
302 skip_bits_long(&gb, 32); // sample rate already known
303 sconf->samples = get_bits_long(&gb, 32);
304 avctx->channels = m4ac.channels;
305 skip_bits(&gb, 16); // number of channels already knwon
306 skip_bits(&gb, 3); // skip file_type
307 sconf->resolution = get_bits(&gb, 3);
308 sconf->floating = get_bits1(&gb);
309 sconf->msb_first = get_bits1(&gb);
310 sconf->frame_length = get_bits(&gb, 16) + 1;
311 sconf->ra_distance = get_bits(&gb, 8);
312 sconf->ra_flag = get_bits(&gb, 2);
313 sconf->adapt_order = get_bits1(&gb);
314 sconf->coef_table = get_bits(&gb, 2);
315 sconf->long_term_prediction = get_bits1(&gb);
316 sconf->max_order = get_bits(&gb, 10);
317 sconf->block_switching = get_bits(&gb, 2);
318 sconf->bgmc = get_bits1(&gb);
319 sconf->sb_part = get_bits1(&gb);
320 sconf->joint_stereo = get_bits1(&gb);
321 sconf->mc_coding = get_bits1(&gb);
322 sconf->chan_config = get_bits1(&gb);
323 sconf->chan_sort = get_bits1(&gb);
324 sconf->crc_enabled = get_bits1(&gb);
325 sconf->rlslms = get_bits1(&gb);
326 skip_bits(&gb, 5); // skip 5 reserved bits
327 skip_bits1(&gb); // skip aux_data_enabled
330 // check for ALSSpecificConfig struct
331 if (als_id != MKBETAG('A','L','S','\0'))
334 ctx->cur_frame_length = sconf->frame_length;
336 // read channel config
337 if (sconf->chan_config)
338 sconf->chan_config_info = get_bits(&gb, 16);
339 // TODO: use this to set avctx->channel_layout
342 // read channel sorting
343 if (sconf->chan_sort && avctx->channels > 1) {
344 int chan_pos_bits = av_ceil_log2(avctx->channels);
345 int bits_needed = avctx->channels * chan_pos_bits + 7;
346 if (get_bits_left(&gb) < bits_needed)
349 if (!(sconf->chan_pos = av_malloc(avctx->channels * sizeof(*sconf->chan_pos))))
350 return AVERROR(ENOMEM);
352 for (i = 0; i < avctx->channels; i++)
353 sconf->chan_pos[i] = get_bits(&gb, chan_pos_bits);
356 // TODO: use this to actually do channel sorting
358 sconf->chan_sort = 0;
362 // read fixed header and trailer sizes,
363 // if size = 0xFFFFFFFF then there is no data field!
364 if (get_bits_left(&gb) < 64)
367 header_size = get_bits_long(&gb, 32);
368 trailer_size = get_bits_long(&gb, 32);
369 if (header_size == 0xFFFFFFFF)
371 if (trailer_size == 0xFFFFFFFF)
374 ht_size = ((int64_t)(header_size) + (int64_t)(trailer_size)) << 3;
377 // skip the header and trailer data
378 if (get_bits_left(&gb) < ht_size)
381 if (ht_size > INT32_MAX)
384 skip_bits_long(&gb, ht_size);
387 // initialize CRC calculation
388 if (sconf->crc_enabled) {
389 if (get_bits_left(&gb) < 32)
392 if (avctx->error_recognition >= FF_ER_CAREFUL) {
393 ctx->crc_table = av_crc_get_table(AV_CRC_32_IEEE_LE);
394 ctx->crc = 0xFFFFFFFF;
395 ctx->crc_org = ~get_bits_long(&gb, 32);
397 skip_bits_long(&gb, 32);
401 // no need to read the rest of ALSSpecificConfig (ra_unit_size & aux data)
403 dprint_specific_config(ctx);
409 /** Check the ALSSpecificConfig for unsupported features.
411 static int check_specific_config(ALSDecContext *ctx)
413 ALSSpecificConfig *sconf = &ctx->sconf;
416 // report unsupported feature and set error value
417 #define MISSING_ERR(cond, str, errval) \
420 av_log_missing_feature(ctx->avctx, str, 0); \
425 MISSING_ERR(sconf->floating, "Floating point decoding", -1);
426 MISSING_ERR(sconf->rlslms, "Adaptive RLS-LMS prediction", -1);
427 MISSING_ERR(sconf->chan_sort, "Channel sorting", 0);
433 /** Parse the bs_info field to extract the block partitioning used in
434 * block switching mode, refer to ISO/IEC 14496-3, section 11.6.2.
436 static void parse_bs_info(const uint32_t bs_info, unsigned int n,
437 unsigned int div, unsigned int **div_blocks,
438 unsigned int *num_blocks)
440 if (n < 31 && ((bs_info << n) & 0x40000000)) {
441 // if the level is valid and the investigated bit n is set
442 // then recursively check both children at bits (2n+1) and (2n+2)
445 parse_bs_info(bs_info, n + 1, div, div_blocks, num_blocks);
446 parse_bs_info(bs_info, n + 2, div, div_blocks, num_blocks);
448 // else the bit is not set or the last level has been reached
449 // (bit implicitly not set)
457 /** Read and decode a Rice codeword.
459 static int32_t decode_rice(GetBitContext *gb, unsigned int k)
461 int max = get_bits_left(gb) - k;
462 int q = get_unary(gb, 0, max);
463 int r = k ? get_bits1(gb) : !(q & 1);
467 q += get_bits_long(gb, k - 1);
475 /** Convert PARCOR coefficient k to direct filter coefficient.
477 static void parcor_to_lpc(unsigned int k, const int32_t *par, int32_t *cof)
481 for (i = 0, j = k - 1; i < j; i++, j--) {
482 int tmp1 = ((MUL64(par[k], cof[j]) + (1 << 19)) >> 20);
483 cof[j] += ((MUL64(par[k], cof[i]) + (1 << 19)) >> 20);
487 cof[i] += ((MUL64(par[k], cof[j]) + (1 << 19)) >> 20);
493 /** Read block switching field if necessary and set actual block sizes.
494 * Also assure that the block sizes of the last frame correspond to the
495 * actual number of samples.
497 static void get_block_sizes(ALSDecContext *ctx, unsigned int *div_blocks,
500 ALSSpecificConfig *sconf = &ctx->sconf;
501 GetBitContext *gb = &ctx->gb;
502 unsigned int *ptr_div_blocks = div_blocks;
505 if (sconf->block_switching) {
506 unsigned int bs_info_len = 1 << (sconf->block_switching + 2);
507 *bs_info = get_bits_long(gb, bs_info_len);
508 *bs_info <<= (32 - bs_info_len);
512 parse_bs_info(*bs_info, 0, 0, &ptr_div_blocks, &ctx->num_blocks);
514 // The last frame may have an overdetermined block structure given in
515 // the bitstream. In that case the defined block structure would need
516 // more samples than available to be consistent.
517 // The block structure is actually used but the block sizes are adapted
518 // to fit the actual number of available samples.
519 // Example: 5 samples, 2nd level block sizes: 2 2 2 2.
520 // This results in the actual block sizes: 2 2 1 0.
521 // This is not specified in 14496-3 but actually done by the reference
522 // codec RM22 revision 2.
523 // This appears to happen in case of an odd number of samples in the last
524 // frame which is actually not allowed by the block length switching part
526 // The ALS conformance files feature an odd number of samples in the last
529 for (b = 0; b < ctx->num_blocks; b++)
530 div_blocks[b] = ctx->sconf.frame_length >> div_blocks[b];
532 if (ctx->cur_frame_length != ctx->sconf.frame_length) {
533 unsigned int remaining = ctx->cur_frame_length;
535 for (b = 0; b < ctx->num_blocks; b++) {
536 if (remaining <= div_blocks[b]) {
537 div_blocks[b] = remaining;
538 ctx->num_blocks = b + 1;
542 remaining -= div_blocks[b];
548 /** Read the block data for a constant block
550 static void read_const_block_data(ALSDecContext *ctx, ALSBlockData *bd)
552 ALSSpecificConfig *sconf = &ctx->sconf;
553 AVCodecContext *avctx = ctx->avctx;
554 GetBitContext *gb = &ctx->gb;
557 bd->const_block = get_bits1(gb); // 1 = constant value, 0 = zero block (silence)
558 bd->js_blocks = get_bits1(gb);
560 // skip 5 reserved bits
563 if (bd->const_block) {
564 unsigned int const_val_bits = sconf->floating ? 24 : avctx->bits_per_raw_sample;
565 bd->const_val = get_sbits_long(gb, const_val_bits);
568 // ensure constant block decoding by reusing this field
573 /** Decode the block data for a constant block
575 static void decode_const_block_data(ALSDecContext *ctx, ALSBlockData *bd)
577 int smp = bd->block_length;
578 int32_t val = bd->const_val;
579 int32_t *dst = bd->raw_samples;
581 // write raw samples into buffer
587 /** Read the block data for a non-constant block
589 static int read_var_block_data(ALSDecContext *ctx, ALSBlockData *bd)
591 ALSSpecificConfig *sconf = &ctx->sconf;
592 AVCodecContext *avctx = ctx->avctx;
593 GetBitContext *gb = &ctx->gb;
597 unsigned int sub_blocks, log2_sub_blocks, sb_length;
598 unsigned int start = 0;
599 unsigned int opt_order;
601 int32_t *quant_cof = bd->quant_cof;
602 int32_t *current_res;
605 // ensure variable block decoding by reusing this field
609 bd->js_blocks = get_bits1(gb);
611 opt_order = bd->opt_order;
613 // determine the number of subblocks for entropy decoding
614 if (!sconf->bgmc && !sconf->sb_part) {
617 if (sconf->bgmc && sconf->sb_part)
618 log2_sub_blocks = get_bits(gb, 2);
620 log2_sub_blocks = 2 * get_bits1(gb);
623 sub_blocks = 1 << log2_sub_blocks;
625 // do not continue in case of a damaged stream since
626 // block_length must be evenly divisible by sub_blocks
627 if (bd->block_length & (sub_blocks - 1)) {
628 av_log(avctx, AV_LOG_WARNING,
629 "Block length is not evenly divisible by the number of subblocks.\n");
633 sb_length = bd->block_length >> log2_sub_blocks;
636 s[0] = get_bits(gb, 8 + (sconf->resolution > 1));
637 for (k = 1; k < sub_blocks; k++)
638 s[k] = s[k - 1] + decode_rice(gb, 2);
640 for (k = 0; k < sub_blocks; k++) {
645 s[0] = get_bits(gb, 4 + (sconf->resolution > 1));
646 for (k = 1; k < sub_blocks; k++)
647 s[k] = s[k - 1] + decode_rice(gb, 0);
651 bd->shift_lsbs = get_bits(gb, 4) + 1;
653 bd->store_prev_samples = (bd->js_blocks && bd->raw_other) || bd->shift_lsbs;
656 if (!sconf->rlslms) {
657 if (sconf->adapt_order) {
658 int opt_order_length = av_ceil_log2(av_clip((bd->block_length >> 3) - 1,
659 2, sconf->max_order + 1));
660 bd->opt_order = get_bits(gb, opt_order_length);
662 bd->opt_order = sconf->max_order;
665 opt_order = bd->opt_order;
670 if (sconf->coef_table == 3) {
673 // read coefficient 0
674 quant_cof[0] = 32 * parcor_scaled_values[get_bits(gb, 7)];
676 // read coefficient 1
678 quant_cof[1] = -32 * parcor_scaled_values[get_bits(gb, 7)];
680 // read coefficients 2 to opt_order
681 for (k = 2; k < opt_order; k++)
682 quant_cof[k] = get_bits(gb, 7);
687 // read coefficient 0 to 19
688 k_max = FFMIN(opt_order, 20);
689 for (k = 0; k < k_max; k++) {
690 int rice_param = parcor_rice_table[sconf->coef_table][k][1];
691 int offset = parcor_rice_table[sconf->coef_table][k][0];
692 quant_cof[k] = decode_rice(gb, rice_param) + offset;
695 // read coefficients 20 to 126
696 k_max = FFMIN(opt_order, 127);
697 for (; k < k_max; k++)
698 quant_cof[k] = decode_rice(gb, 2) + (k & 1);
700 // read coefficients 127 to opt_order
701 for (; k < opt_order; k++)
702 quant_cof[k] = decode_rice(gb, 1);
704 quant_cof[0] = 32 * parcor_scaled_values[quant_cof[0] + 64];
707 quant_cof[1] = -32 * parcor_scaled_values[quant_cof[1] + 64];
710 for (k = 2; k < opt_order; k++)
711 quant_cof[k] = (quant_cof[k] << 14) + (add_base << 13);
715 // read LTP gain and lag values
716 if (sconf->long_term_prediction) {
717 *bd->use_ltp = get_bits1(gb);
722 bd->ltp_gain[0] = decode_rice(gb, 1) << 3;
723 bd->ltp_gain[1] = decode_rice(gb, 2) << 3;
725 r = get_unary(gb, 0, 4);
727 bd->ltp_gain[2] = ltp_gain_values[r][c];
729 bd->ltp_gain[3] = decode_rice(gb, 2) << 3;
730 bd->ltp_gain[4] = decode_rice(gb, 1) << 3;
732 *bd->ltp_lag = get_bits(gb, ctx->ltp_lag_length);
733 *bd->ltp_lag += FFMAX(4, opt_order + 1);
737 // read first value and residuals in case of a random access block
740 bd->raw_samples[0] = decode_rice(gb, avctx->bits_per_raw_sample - 4);
742 bd->raw_samples[1] = decode_rice(gb, FFMIN(s[0] + 3, ctx->s_max));
744 bd->raw_samples[2] = decode_rice(gb, FFMIN(s[0] + 1, ctx->s_max));
746 start = FFMIN(opt_order, 3);
749 // read all residuals
751 unsigned int delta[8];
753 unsigned int b = av_clip((av_ceil_log2(bd->block_length) - 3) >> 1, 0, 5);
754 unsigned int i = start;
756 // read most significant bits
761 ff_bgmc_decode_init(gb, &high, &low, &value);
763 current_res = bd->raw_samples + start;
765 for (sb = 0; sb < sub_blocks; sb++, i = 0) {
766 k [sb] = s[sb] > b ? s[sb] - b : 0;
767 delta[sb] = 5 - s[sb] + k[sb];
769 ff_bgmc_decode(gb, sb_length, current_res,
770 delta[sb], sx[sb], &high, &low, &value, ctx->bgmc_lut, ctx->bgmc_lut_status);
772 current_res += sb_length;
775 ff_bgmc_decode_end(gb);
778 // read least significant bits and tails
780 current_res = bd->raw_samples + start;
782 for (sb = 0; sb < sub_blocks; sb++, i = 0) {
783 unsigned int cur_tail_code = tail_code[sx[sb]][delta[sb]];
784 unsigned int cur_k = k[sb];
785 unsigned int cur_s = s[sb];
787 for (; i < sb_length; i++) {
788 int32_t res = *current_res;
790 if (res == cur_tail_code) {
791 unsigned int max_msb = (2 + (sx[sb] > 2) + (sx[sb] > 10))
794 res = decode_rice(gb, cur_s);
797 res += (max_msb ) << cur_k;
799 res -= (max_msb - 1) << cur_k;
802 if (res > cur_tail_code)
812 res |= get_bits_long(gb, cur_k);
816 *current_res++ = res;
820 current_res = bd->raw_samples + start;
822 for (sb = 0; sb < sub_blocks; sb++, start = 0)
823 for (; start < sb_length; start++)
824 *current_res++ = decode_rice(gb, s[sb]);
827 if (!sconf->mc_coding || ctx->js_switch)
834 /** Decode the block data for a non-constant block
836 static int decode_var_block_data(ALSDecContext *ctx, ALSBlockData *bd)
838 ALSSpecificConfig *sconf = &ctx->sconf;
839 unsigned int block_length = bd->block_length;
840 unsigned int smp = 0;
842 int opt_order = bd->opt_order;
845 int32_t *quant_cof = bd->quant_cof;
846 int32_t *lpc_cof = bd->lpc_cof;
847 int32_t *raw_samples = bd->raw_samples;
848 int32_t *raw_samples_end = bd->raw_samples + bd->block_length;
849 int32_t *lpc_cof_reversed = ctx->lpc_cof_reversed_buffer;
851 // reverse long-term prediction
855 for (ltp_smp = FFMAX(*bd->ltp_lag - 2, 0); ltp_smp < block_length; ltp_smp++) {
856 int center = ltp_smp - *bd->ltp_lag;
857 int begin = FFMAX(0, center - 2);
858 int end = center + 3;
859 int tab = 5 - (end - begin);
864 for (base = begin; base < end; base++, tab++)
865 y += MUL64(bd->ltp_gain[tab], raw_samples[base]);
867 raw_samples[ltp_smp] += y >> 7;
871 // reconstruct all samples from residuals
873 for (smp = 0; smp < opt_order; smp++) {
876 for (sb = 0; sb < smp; sb++)
877 y += MUL64(lpc_cof[sb], raw_samples[-(sb + 1)]);
879 *raw_samples++ -= y >> 20;
880 parcor_to_lpc(smp, quant_cof, lpc_cof);
883 for (k = 0; k < opt_order; k++)
884 parcor_to_lpc(k, quant_cof, lpc_cof);
886 // store previous samples in case that they have to be altered
887 if (bd->store_prev_samples)
888 memcpy(bd->prev_raw_samples, raw_samples - sconf->max_order,
889 sizeof(*bd->prev_raw_samples) * sconf->max_order);
891 // reconstruct difference signal for prediction (joint-stereo)
892 if (bd->js_blocks && bd->raw_other) {
893 int32_t *left, *right;
895 if (bd->raw_other > raw_samples) { // D = R - L
897 right = bd->raw_other;
898 } else { // D = R - L
899 left = bd->raw_other;
903 for (sb = -1; sb >= -sconf->max_order; sb--)
904 raw_samples[sb] = right[sb] - left[sb];
907 // reconstruct shifted signal
909 for (sb = -1; sb >= -sconf->max_order; sb--)
910 raw_samples[sb] >>= bd->shift_lsbs;
913 // reverse linear prediction coefficients for efficiency
914 lpc_cof = lpc_cof + opt_order;
916 for (sb = 0; sb < opt_order; sb++)
917 lpc_cof_reversed[sb] = lpc_cof[-(sb + 1)];
919 // reconstruct raw samples
920 raw_samples = bd->raw_samples + smp;
921 lpc_cof = lpc_cof_reversed + opt_order;
923 for (; raw_samples < raw_samples_end; raw_samples++) {
926 for (sb = -opt_order; sb < 0; sb++)
927 y += MUL64(lpc_cof[sb], raw_samples[sb]);
929 *raw_samples -= y >> 20;
932 raw_samples = bd->raw_samples;
934 // restore previous samples in case that they have been altered
935 if (bd->store_prev_samples)
936 memcpy(raw_samples - sconf->max_order, bd->prev_raw_samples,
937 sizeof(*raw_samples) * sconf->max_order);
943 /** Read the block data.
945 static int read_block(ALSDecContext *ctx, ALSBlockData *bd)
947 GetBitContext *gb = &ctx->gb;
949 // read block type flag and read the samples accordingly
951 if (read_var_block_data(ctx, bd))
954 read_const_block_data(ctx, bd);
961 /** Decode the block data.
963 static int decode_block(ALSDecContext *ctx, ALSBlockData *bd)
967 // read block type flag and read the samples accordingly
969 decode_const_block_data(ctx, bd);
970 else if (decode_var_block_data(ctx, bd))
973 // TODO: read RLSLMS extension data
976 for (smp = 0; smp < bd->block_length; smp++)
977 bd->raw_samples[smp] <<= bd->shift_lsbs;
983 /** Read and decode block data successively.
985 static int read_decode_block(ALSDecContext *ctx, ALSBlockData *bd)
989 ret = read_block(ctx, bd);
994 ret = decode_block(ctx, bd);
1000 /** Compute the number of samples left to decode for the current frame and
1001 * sets these samples to zero.
1003 static void zero_remaining(unsigned int b, unsigned int b_max,
1004 const unsigned int *div_blocks, int32_t *buf)
1006 unsigned int count = 0;
1009 count += div_blocks[b];
1012 memset(buf, 0, sizeof(*buf) * count);
1016 /** Decode blocks independently.
1018 static int decode_blocks_ind(ALSDecContext *ctx, unsigned int ra_frame,
1019 unsigned int c, const unsigned int *div_blocks,
1020 unsigned int *js_blocks)
1025 memset(&bd, 0, sizeof(ALSBlockData));
1027 bd.ra_block = ra_frame;
1028 bd.use_ltp = ctx->use_ltp;
1029 bd.ltp_lag = ctx->ltp_lag;
1030 bd.ltp_gain = ctx->ltp_gain[0];
1031 bd.quant_cof = ctx->quant_cof[0];
1032 bd.lpc_cof = ctx->lpc_cof[0];
1033 bd.prev_raw_samples = ctx->prev_raw_samples;
1034 bd.raw_samples = ctx->raw_samples[c];
1037 for (b = 0; b < ctx->num_blocks; b++) {
1039 bd.block_length = div_blocks[b];
1041 if (read_decode_block(ctx, &bd)) {
1042 // damaged block, write zero for the rest of the frame
1043 zero_remaining(b, ctx->num_blocks, div_blocks, bd.raw_samples);
1046 bd.raw_samples += div_blocks[b];
1054 /** Decode blocks dependently.
1056 static int decode_blocks(ALSDecContext *ctx, unsigned int ra_frame,
1057 unsigned int c, const unsigned int *div_blocks,
1058 unsigned int *js_blocks)
1060 ALSSpecificConfig *sconf = &ctx->sconf;
1061 unsigned int offset = 0;
1065 memset(bd, 0, 2 * sizeof(ALSBlockData));
1067 bd[0].ra_block = ra_frame;
1068 bd[0].use_ltp = ctx->use_ltp;
1069 bd[0].ltp_lag = ctx->ltp_lag;
1070 bd[0].ltp_gain = ctx->ltp_gain[0];
1071 bd[0].quant_cof = ctx->quant_cof[0];
1072 bd[0].lpc_cof = ctx->lpc_cof[0];
1073 bd[0].prev_raw_samples = ctx->prev_raw_samples;
1074 bd[0].js_blocks = *js_blocks;
1076 bd[1].ra_block = ra_frame;
1077 bd[1].use_ltp = ctx->use_ltp;
1078 bd[1].ltp_lag = ctx->ltp_lag;
1079 bd[1].ltp_gain = ctx->ltp_gain[0];
1080 bd[1].quant_cof = ctx->quant_cof[0];
1081 bd[1].lpc_cof = ctx->lpc_cof[0];
1082 bd[1].prev_raw_samples = ctx->prev_raw_samples;
1083 bd[1].js_blocks = *(js_blocks + 1);
1085 // decode all blocks
1086 for (b = 0; b < ctx->num_blocks; b++) {
1089 bd[0].shift_lsbs = 0;
1090 bd[1].shift_lsbs = 0;
1092 bd[0].block_length = div_blocks[b];
1093 bd[1].block_length = div_blocks[b];
1095 bd[0].raw_samples = ctx->raw_samples[c ] + offset;
1096 bd[1].raw_samples = ctx->raw_samples[c + 1] + offset;
1098 bd[0].raw_other = bd[1].raw_samples;
1099 bd[1].raw_other = bd[0].raw_samples;
1101 if(read_decode_block(ctx, &bd[0]) || read_decode_block(ctx, &bd[1])) {
1102 // damaged block, write zero for the rest of the frame
1103 zero_remaining(b, ctx->num_blocks, div_blocks, bd[0].raw_samples);
1104 zero_remaining(b, ctx->num_blocks, div_blocks, bd[1].raw_samples);
1108 // reconstruct joint-stereo blocks
1109 if (bd[0].js_blocks) {
1110 if (bd[1].js_blocks)
1111 av_log(ctx->avctx, AV_LOG_WARNING, "Invalid channel pair!\n");
1113 for (s = 0; s < div_blocks[b]; s++)
1114 bd[0].raw_samples[s] = bd[1].raw_samples[s] - bd[0].raw_samples[s];
1115 } else if (bd[1].js_blocks) {
1116 for (s = 0; s < div_blocks[b]; s++)
1117 bd[1].raw_samples[s] = bd[1].raw_samples[s] + bd[0].raw_samples[s];
1120 offset += div_blocks[b];
1125 // store carryover raw samples,
1126 // the others channel raw samples are stored by the calling function.
1127 memmove(ctx->raw_samples[c] - sconf->max_order,
1128 ctx->raw_samples[c] - sconf->max_order + sconf->frame_length,
1129 sizeof(*ctx->raw_samples[c]) * sconf->max_order);
1135 /** Read the channel data.
1137 static int read_channel_data(ALSDecContext *ctx, ALSChannelData *cd, int c)
1139 GetBitContext *gb = &ctx->gb;
1140 ALSChannelData *current = cd;
1141 unsigned int channels = ctx->avctx->channels;
1144 while (entries < channels && !(current->stop_flag = get_bits1(gb))) {
1145 current->master_channel = get_bits_long(gb, av_ceil_log2(channels));
1147 if (current->master_channel >= channels) {
1148 av_log(ctx->avctx, AV_LOG_ERROR, "Invalid master channel!\n");
1152 if (current->master_channel != c) {
1153 current->time_diff_flag = get_bits1(gb);
1154 current->weighting[0] = mcc_weightings[av_clip(decode_rice(gb, 1) + 16, 0, 32)];
1155 current->weighting[1] = mcc_weightings[av_clip(decode_rice(gb, 2) + 14, 0, 32)];
1156 current->weighting[2] = mcc_weightings[av_clip(decode_rice(gb, 1) + 16, 0, 32)];
1158 if (current->time_diff_flag) {
1159 current->weighting[3] = mcc_weightings[av_clip(decode_rice(gb, 1) + 16, 0, 32)];
1160 current->weighting[4] = mcc_weightings[av_clip(decode_rice(gb, 1) + 16, 0, 32)];
1161 current->weighting[5] = mcc_weightings[av_clip(decode_rice(gb, 1) + 16, 0, 32)];
1163 current->time_diff_sign = get_bits1(gb);
1164 current->time_diff_index = get_bits(gb, ctx->ltp_lag_length - 3) + 3;
1172 if (entries == channels) {
1173 av_log(ctx->avctx, AV_LOG_ERROR, "Damaged channel data!\n");
1182 /** Recursively reverts the inter-channel correlation for a block.
1184 static int revert_channel_correlation(ALSDecContext *ctx, ALSBlockData *bd,
1185 ALSChannelData **cd, int *reverted,
1186 unsigned int offset, int c)
1188 ALSChannelData *ch = cd[c];
1189 unsigned int dep = 0;
1190 unsigned int channels = ctx->avctx->channels;
1197 while (dep < channels && !ch[dep].stop_flag) {
1198 revert_channel_correlation(ctx, bd, cd, reverted, offset,
1199 ch[dep].master_channel);
1204 if (dep == channels) {
1205 av_log(ctx->avctx, AV_LOG_WARNING, "Invalid channel correlation!\n");
1209 bd->use_ltp = ctx->use_ltp + c;
1210 bd->ltp_lag = ctx->ltp_lag + c;
1211 bd->ltp_gain = ctx->ltp_gain[c];
1212 bd->lpc_cof = ctx->lpc_cof[c];
1213 bd->quant_cof = ctx->quant_cof[c];
1214 bd->raw_samples = ctx->raw_samples[c] + offset;
1217 while (!ch[dep].stop_flag) {
1219 unsigned int begin = 1;
1220 unsigned int end = bd->block_length - 1;
1222 int32_t *master = ctx->raw_samples[ch[dep].master_channel] + offset;
1224 if (ch[dep].time_diff_flag) {
1225 int t = ch[dep].time_diff_index;
1227 if (ch[dep].time_diff_sign) {
1234 for (smp = begin; smp < end; smp++) {
1236 MUL64(ch[dep].weighting[0], master[smp - 1 ]) +
1237 MUL64(ch[dep].weighting[1], master[smp ]) +
1238 MUL64(ch[dep].weighting[2], master[smp + 1 ]) +
1239 MUL64(ch[dep].weighting[3], master[smp - 1 + t]) +
1240 MUL64(ch[dep].weighting[4], master[smp + t]) +
1241 MUL64(ch[dep].weighting[5], master[smp + 1 + t]);
1243 bd->raw_samples[smp] += y >> 7;
1246 for (smp = begin; smp < end; smp++) {
1248 MUL64(ch[dep].weighting[0], master[smp - 1]) +
1249 MUL64(ch[dep].weighting[1], master[smp ]) +
1250 MUL64(ch[dep].weighting[2], master[smp + 1]);
1252 bd->raw_samples[smp] += y >> 7;
1263 /** Read the frame data.
1265 static int read_frame_data(ALSDecContext *ctx, unsigned int ra_frame)
1267 ALSSpecificConfig *sconf = &ctx->sconf;
1268 AVCodecContext *avctx = ctx->avctx;
1269 GetBitContext *gb = &ctx->gb;
1270 unsigned int div_blocks[32]; ///< block sizes.
1272 unsigned int js_blocks[2];
1274 uint32_t bs_info = 0;
1276 // skip the size of the ra unit if present in the frame
1277 if (sconf->ra_flag == RA_FLAG_FRAMES && ra_frame)
1278 skip_bits_long(gb, 32);
1280 if (sconf->mc_coding && sconf->joint_stereo) {
1281 ctx->js_switch = get_bits1(gb);
1285 if (!sconf->mc_coding || ctx->js_switch) {
1286 int independent_bs = !sconf->joint_stereo;
1288 for (c = 0; c < avctx->channels; c++) {
1292 get_block_sizes(ctx, div_blocks, &bs_info);
1294 // if joint_stereo and block_switching is set, independent decoding
1295 // is signaled via the first bit of bs_info
1296 if (sconf->joint_stereo && sconf->block_switching)
1300 // if this is the last channel, it has to be decoded independently
1301 if (c == avctx->channels - 1)
1304 if (independent_bs) {
1305 if (decode_blocks_ind(ctx, ra_frame, c, div_blocks, js_blocks))
1310 if (decode_blocks(ctx, ra_frame, c, div_blocks, js_blocks))
1316 // store carryover raw samples
1317 memmove(ctx->raw_samples[c] - sconf->max_order,
1318 ctx->raw_samples[c] - sconf->max_order + sconf->frame_length,
1319 sizeof(*ctx->raw_samples[c]) * sconf->max_order);
1321 } else { // multi-channel coding
1324 int *reverted_channels = ctx->reverted_channels;
1325 unsigned int offset = 0;
1327 for (c = 0; c < avctx->channels; c++)
1328 if (ctx->chan_data[c] < ctx->chan_data_buffer) {
1329 av_log(ctx->avctx, AV_LOG_ERROR, "Invalid channel data!\n");
1333 memset(&bd, 0, sizeof(ALSBlockData));
1334 memset(reverted_channels, 0, sizeof(*reverted_channels) * avctx->channels);
1336 bd.ra_block = ra_frame;
1337 bd.prev_raw_samples = ctx->prev_raw_samples;
1339 get_block_sizes(ctx, div_blocks, &bs_info);
1341 for (b = 0; b < ctx->num_blocks; b++) {
1343 bd.block_length = div_blocks[b];
1345 for (c = 0; c < avctx->channels; c++) {
1346 bd.use_ltp = ctx->use_ltp + c;
1347 bd.ltp_lag = ctx->ltp_lag + c;
1348 bd.ltp_gain = ctx->ltp_gain[c];
1349 bd.lpc_cof = ctx->lpc_cof[c];
1350 bd.quant_cof = ctx->quant_cof[c];
1351 bd.raw_samples = ctx->raw_samples[c] + offset;
1352 bd.raw_other = NULL;
1354 read_block(ctx, &bd);
1355 if (read_channel_data(ctx, ctx->chan_data[c], c))
1359 for (c = 0; c < avctx->channels; c++)
1360 if (revert_channel_correlation(ctx, &bd, ctx->chan_data,
1361 reverted_channels, offset, c))
1364 for (c = 0; c < avctx->channels; c++) {
1365 bd.use_ltp = ctx->use_ltp + c;
1366 bd.ltp_lag = ctx->ltp_lag + c;
1367 bd.ltp_gain = ctx->ltp_gain[c];
1368 bd.lpc_cof = ctx->lpc_cof[c];
1369 bd.quant_cof = ctx->quant_cof[c];
1370 bd.raw_samples = ctx->raw_samples[c] + offset;
1371 decode_block(ctx, &bd);
1374 memset(reverted_channels, 0, avctx->channels * sizeof(*reverted_channels));
1375 offset += div_blocks[b];
1379 // store carryover raw samples
1380 for (c = 0; c < avctx->channels; c++)
1381 memmove(ctx->raw_samples[c] - sconf->max_order,
1382 ctx->raw_samples[c] - sconf->max_order + sconf->frame_length,
1383 sizeof(*ctx->raw_samples[c]) * sconf->max_order);
1386 // TODO: read_diff_float_data
1392 /** Decode an ALS frame.
1394 static int decode_frame(AVCodecContext *avctx,
1395 void *data, int *data_size,
1398 ALSDecContext *ctx = avctx->priv_data;
1399 ALSSpecificConfig *sconf = &ctx->sconf;
1400 const uint8_t *buffer = avpkt->data;
1401 int buffer_size = avpkt->size;
1402 int invalid_frame, size;
1403 unsigned int c, sample, ra_frame, bytes_read, shift;
1405 init_get_bits(&ctx->gb, buffer, buffer_size * 8);
1407 // In the case that the distance between random access frames is set to zero
1408 // (sconf->ra_distance == 0) no frame is treated as a random access frame.
1409 // For the first frame, if prediction is used, all samples used from the
1410 // previous frame are assumed to be zero.
1411 ra_frame = sconf->ra_distance && !(ctx->frame_id % sconf->ra_distance);
1413 // the last frame to decode might have a different length
1414 if (sconf->samples != 0xFFFFFFFF)
1415 ctx->cur_frame_length = FFMIN(sconf->samples - ctx->frame_id * (uint64_t) sconf->frame_length,
1416 sconf->frame_length);
1418 ctx->cur_frame_length = sconf->frame_length;
1420 // decode the frame data
1421 if ((invalid_frame = read_frame_data(ctx, ra_frame) < 0))
1422 av_log(ctx->avctx, AV_LOG_WARNING,
1423 "Reading frame data failed. Skipping RA unit.\n");
1427 // check for size of decoded data
1428 size = ctx->cur_frame_length * avctx->channels *
1429 (av_get_bits_per_sample_format(avctx->sample_fmt) >> 3);
1431 if (size > *data_size) {
1432 av_log(avctx, AV_LOG_ERROR, "Decoded data exceeds buffer size.\n");
1438 // transform decoded frame into output format
1439 #define INTERLEAVE_OUTPUT(bps) \
1441 int##bps##_t *dest = (int##bps##_t*) data; \
1442 shift = bps - ctx->avctx->bits_per_raw_sample; \
1443 for (sample = 0; sample < ctx->cur_frame_length; sample++) \
1444 for (c = 0; c < avctx->channels; c++) \
1445 *dest++ = ctx->raw_samples[c][sample] << shift; \
1448 if (ctx->avctx->bits_per_raw_sample <= 16) {
1449 INTERLEAVE_OUTPUT(16)
1451 INTERLEAVE_OUTPUT(32)
1455 if (sconf->crc_enabled && avctx->error_recognition >= FF_ER_CAREFUL) {
1456 int swap = HAVE_BIGENDIAN != sconf->msb_first;
1458 if (ctx->avctx->bits_per_raw_sample == 24) {
1459 int32_t *src = data;
1462 sample < ctx->cur_frame_length * avctx->channels;
1467 v = bswap_32(src[sample]);
1470 if (!HAVE_BIGENDIAN)
1473 ctx->crc = av_crc(ctx->crc_table, ctx->crc, (uint8_t*)(&v), 3);
1476 uint8_t *crc_source;
1479 if (ctx->avctx->bits_per_raw_sample <= 16) {
1480 int16_t *src = (int16_t*) data;
1481 int16_t *dest = (int16_t*) ctx->crc_buffer;
1483 sample < ctx->cur_frame_length * avctx->channels;
1485 *dest++ = bswap_16(src[sample]);
1487 ctx->dsp.bswap_buf((uint32_t*)ctx->crc_buffer, data,
1488 ctx->cur_frame_length * avctx->channels);
1490 crc_source = ctx->crc_buffer;
1495 ctx->crc = av_crc(ctx->crc_table, ctx->crc, crc_source, size);
1499 // check CRC sums if this is the last frame
1500 if (ctx->cur_frame_length != sconf->frame_length &&
1501 ctx->crc_org != ctx->crc) {
1502 av_log(avctx, AV_LOG_ERROR, "CRC error.\n");
1507 bytes_read = invalid_frame ? buffer_size :
1508 (get_bits_count(&ctx->gb) + 7) >> 3;
1514 /** Uninitialize the ALS decoder.
1516 static av_cold int decode_end(AVCodecContext *avctx)
1518 ALSDecContext *ctx = avctx->priv_data;
1520 av_freep(&ctx->sconf.chan_pos);
1522 ff_bgmc_end(&ctx->bgmc_lut, &ctx->bgmc_lut_status);
1524 av_freep(&ctx->use_ltp);
1525 av_freep(&ctx->ltp_lag);
1526 av_freep(&ctx->ltp_gain);
1527 av_freep(&ctx->ltp_gain_buffer);
1528 av_freep(&ctx->quant_cof);
1529 av_freep(&ctx->lpc_cof);
1530 av_freep(&ctx->quant_cof_buffer);
1531 av_freep(&ctx->lpc_cof_buffer);
1532 av_freep(&ctx->lpc_cof_reversed_buffer);
1533 av_freep(&ctx->prev_raw_samples);
1534 av_freep(&ctx->raw_samples);
1535 av_freep(&ctx->raw_buffer);
1536 av_freep(&ctx->chan_data);
1537 av_freep(&ctx->chan_data_buffer);
1538 av_freep(&ctx->reverted_channels);
1544 /** Initialize the ALS decoder.
1546 static av_cold int decode_init(AVCodecContext *avctx)
1549 unsigned int channel_size;
1551 ALSDecContext *ctx = avctx->priv_data;
1552 ALSSpecificConfig *sconf = &ctx->sconf;
1555 if (!avctx->extradata) {
1556 av_log(avctx, AV_LOG_ERROR, "Missing required ALS extradata.\n");
1560 if (read_specific_config(ctx)) {
1561 av_log(avctx, AV_LOG_ERROR, "Reading ALSSpecificConfig failed.\n");
1566 if (check_specific_config(ctx)) {
1572 ff_bgmc_init(avctx, &ctx->bgmc_lut, &ctx->bgmc_lut_status);
1574 if (sconf->floating) {
1575 avctx->sample_fmt = SAMPLE_FMT_FLT;
1576 avctx->bits_per_raw_sample = 32;
1578 avctx->sample_fmt = sconf->resolution > 1
1579 ? SAMPLE_FMT_S32 : SAMPLE_FMT_S16;
1580 avctx->bits_per_raw_sample = (sconf->resolution + 1) * 8;
1583 // set maximum Rice parameter for progressive decoding based on resolution
1584 // This is not specified in 14496-3 but actually done by the reference
1585 // codec RM22 revision 2.
1586 ctx->s_max = sconf->resolution > 1 ? 31 : 15;
1588 // set lag value for long-term prediction
1589 ctx->ltp_lag_length = 8 + (avctx->sample_rate >= 96000) +
1590 (avctx->sample_rate >= 192000);
1592 // allocate quantized parcor coefficient buffer
1593 num_buffers = sconf->mc_coding ? avctx->channels : 1;
1595 ctx->quant_cof = av_malloc(sizeof(*ctx->quant_cof) * num_buffers);
1596 ctx->lpc_cof = av_malloc(sizeof(*ctx->lpc_cof) * num_buffers);
1597 ctx->quant_cof_buffer = av_malloc(sizeof(*ctx->quant_cof_buffer) *
1598 num_buffers * sconf->max_order);
1599 ctx->lpc_cof_buffer = av_malloc(sizeof(*ctx->lpc_cof_buffer) *
1600 num_buffers * sconf->max_order);
1601 ctx->lpc_cof_reversed_buffer = av_malloc(sizeof(*ctx->lpc_cof_buffer) *
1604 if (!ctx->quant_cof || !ctx->lpc_cof ||
1605 !ctx->quant_cof_buffer || !ctx->lpc_cof_buffer ||
1606 !ctx->lpc_cof_reversed_buffer) {
1607 av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
1608 return AVERROR(ENOMEM);
1611 // assign quantized parcor coefficient buffers
1612 for (c = 0; c < num_buffers; c++) {
1613 ctx->quant_cof[c] = ctx->quant_cof_buffer + c * sconf->max_order;
1614 ctx->lpc_cof[c] = ctx->lpc_cof_buffer + c * sconf->max_order;
1617 // allocate and assign lag and gain data buffer for ltp mode
1618 ctx->use_ltp = av_mallocz(sizeof(*ctx->use_ltp) * num_buffers);
1619 ctx->ltp_lag = av_malloc (sizeof(*ctx->ltp_lag) * num_buffers);
1620 ctx->ltp_gain = av_malloc (sizeof(*ctx->ltp_gain) * num_buffers);
1621 ctx->ltp_gain_buffer = av_malloc (sizeof(*ctx->ltp_gain_buffer) *
1624 if (!ctx->use_ltp || !ctx->ltp_lag ||
1625 !ctx->ltp_gain || !ctx->ltp_gain_buffer) {
1626 av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
1628 return AVERROR(ENOMEM);
1631 for (c = 0; c < num_buffers; c++)
1632 ctx->ltp_gain[c] = ctx->ltp_gain_buffer + c * 5;
1634 // allocate and assign channel data buffer for mcc mode
1635 if (sconf->mc_coding) {
1636 ctx->chan_data_buffer = av_malloc(sizeof(*ctx->chan_data_buffer) *
1637 num_buffers * num_buffers);
1638 ctx->chan_data = av_malloc(sizeof(*ctx->chan_data) *
1640 ctx->reverted_channels = av_malloc(sizeof(*ctx->reverted_channels) *
1643 if (!ctx->chan_data_buffer || !ctx->chan_data || !ctx->reverted_channels) {
1644 av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
1646 return AVERROR(ENOMEM);
1649 for (c = 0; c < num_buffers; c++)
1650 ctx->chan_data[c] = ctx->chan_data_buffer + c * num_buffers;
1652 ctx->chan_data = NULL;
1653 ctx->chan_data_buffer = NULL;
1654 ctx->reverted_channels = NULL;
1657 avctx->frame_size = sconf->frame_length;
1658 channel_size = sconf->frame_length + sconf->max_order;
1660 ctx->prev_raw_samples = av_malloc (sizeof(*ctx->prev_raw_samples) * sconf->max_order);
1661 ctx->raw_buffer = av_mallocz(sizeof(*ctx-> raw_buffer) * avctx->channels * channel_size);
1662 ctx->raw_samples = av_malloc (sizeof(*ctx-> raw_samples) * avctx->channels);
1664 // allocate previous raw sample buffer
1665 if (!ctx->prev_raw_samples || !ctx->raw_buffer|| !ctx->raw_samples) {
1666 av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
1668 return AVERROR(ENOMEM);
1671 // assign raw samples buffers
1672 ctx->raw_samples[0] = ctx->raw_buffer + sconf->max_order;
1673 for (c = 1; c < avctx->channels; c++)
1674 ctx->raw_samples[c] = ctx->raw_samples[c - 1] + channel_size;
1676 // allocate crc buffer
1677 if (HAVE_BIGENDIAN != sconf->msb_first && sconf->crc_enabled &&
1678 avctx->error_recognition >= FF_ER_CAREFUL) {
1679 ctx->crc_buffer = av_malloc(sizeof(*ctx->crc_buffer) *
1680 ctx->cur_frame_length *
1682 (av_get_bits_per_sample_format(avctx->sample_fmt) >> 3));
1683 if (!ctx->crc_buffer) {
1684 av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
1686 return AVERROR(ENOMEM);
1690 dsputil_init(&ctx->dsp, avctx);
1696 /** Flush (reset) the frame ID after seeking.
1698 static av_cold void flush(AVCodecContext *avctx)
1700 ALSDecContext *ctx = avctx->priv_data;
1706 AVCodec als_decoder = {
1710 sizeof(ALSDecContext),
1716 .capabilities = CODEC_CAP_SUBFRAMES,
1717 .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 Audio Lossless Coding (ALS)"),