3 * Copyright (c) 2009 Thilo Borgmann <thilo.borgmann _at_ mail.de>
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_ mail.de>
33 #include "mpeg4audio.h"
38 #include "libavutil/samplefmt.h"
39 #include "libavutil/crc.h"
40 #include "libavutil/softfloat_ieee754.h"
41 #include "libavutil/intfloat.h"
42 #include "libavutil/intreadwrite.h"
46 /** Rice parameters and corresponding index offsets for decoding the
47 * indices of scaled PARCOR values. The table chosen is set globally
48 * by the encoder and stored in ALSSpecificConfig.
50 static const int8_t parcor_rice_table[3][20][2] = {
51 { {-52, 4}, {-29, 5}, {-31, 4}, { 19, 4}, {-16, 4},
52 { 12, 3}, { -7, 3}, { 9, 3}, { -5, 3}, { 6, 3},
53 { -4, 3}, { 3, 3}, { -3, 2}, { 3, 2}, { -2, 2},
54 { 3, 2}, { -1, 2}, { 2, 2}, { -1, 2}, { 2, 2} },
55 { {-58, 3}, {-42, 4}, {-46, 4}, { 37, 5}, {-36, 4},
56 { 29, 4}, {-29, 4}, { 25, 4}, {-23, 4}, { 20, 4},
57 {-17, 4}, { 16, 4}, {-12, 4}, { 12, 3}, {-10, 4},
58 { 7, 3}, { -4, 4}, { 3, 3}, { -1, 3}, { 1, 3} },
59 { {-59, 3}, {-45, 5}, {-50, 4}, { 38, 4}, {-39, 4},
60 { 32, 4}, {-30, 4}, { 25, 3}, {-23, 3}, { 20, 3},
61 {-20, 3}, { 16, 3}, {-13, 3}, { 10, 3}, { -7, 3},
62 { 3, 3}, { 0, 3}, { -1, 3}, { 2, 3}, { -1, 2} }
66 /** Scaled PARCOR values used for the first two PARCOR coefficients.
67 * To be indexed by the Rice coded indices.
68 * Generated by: parcor_scaled_values[i] = 32 + ((i * (i+1)) << 7) - (1 << 20)
69 * Actual values are divided by 32 in order to be stored in 16 bits.
71 static const int16_t parcor_scaled_values[] = {
72 -1048544 / 32, -1048288 / 32, -1047776 / 32, -1047008 / 32,
73 -1045984 / 32, -1044704 / 32, -1043168 / 32, -1041376 / 32,
74 -1039328 / 32, -1037024 / 32, -1034464 / 32, -1031648 / 32,
75 -1028576 / 32, -1025248 / 32, -1021664 / 32, -1017824 / 32,
76 -1013728 / 32, -1009376 / 32, -1004768 / 32, -999904 / 32,
77 -994784 / 32, -989408 / 32, -983776 / 32, -977888 / 32,
78 -971744 / 32, -965344 / 32, -958688 / 32, -951776 / 32,
79 -944608 / 32, -937184 / 32, -929504 / 32, -921568 / 32,
80 -913376 / 32, -904928 / 32, -896224 / 32, -887264 / 32,
81 -878048 / 32, -868576 / 32, -858848 / 32, -848864 / 32,
82 -838624 / 32, -828128 / 32, -817376 / 32, -806368 / 32,
83 -795104 / 32, -783584 / 32, -771808 / 32, -759776 / 32,
84 -747488 / 32, -734944 / 32, -722144 / 32, -709088 / 32,
85 -695776 / 32, -682208 / 32, -668384 / 32, -654304 / 32,
86 -639968 / 32, -625376 / 32, -610528 / 32, -595424 / 32,
87 -580064 / 32, -564448 / 32, -548576 / 32, -532448 / 32,
88 -516064 / 32, -499424 / 32, -482528 / 32, -465376 / 32,
89 -447968 / 32, -430304 / 32, -412384 / 32, -394208 / 32,
90 -375776 / 32, -357088 / 32, -338144 / 32, -318944 / 32,
91 -299488 / 32, -279776 / 32, -259808 / 32, -239584 / 32,
92 -219104 / 32, -198368 / 32, -177376 / 32, -156128 / 32,
93 -134624 / 32, -112864 / 32, -90848 / 32, -68576 / 32,
94 -46048 / 32, -23264 / 32, -224 / 32, 23072 / 32,
95 46624 / 32, 70432 / 32, 94496 / 32, 118816 / 32,
96 143392 / 32, 168224 / 32, 193312 / 32, 218656 / 32,
97 244256 / 32, 270112 / 32, 296224 / 32, 322592 / 32,
98 349216 / 32, 376096 / 32, 403232 / 32, 430624 / 32,
99 458272 / 32, 486176 / 32, 514336 / 32, 542752 / 32,
100 571424 / 32, 600352 / 32, 629536 / 32, 658976 / 32,
101 688672 / 32, 718624 / 32, 748832 / 32, 779296 / 32,
102 810016 / 32, 840992 / 32, 872224 / 32, 903712 / 32,
103 935456 / 32, 967456 / 32, 999712 / 32, 1032224 / 32
107 /** Gain values of p(0) for long-term prediction.
108 * To be indexed by the Rice coded indices.
110 static const uint8_t ltp_gain_values [4][4] = {
118 /** Inter-channel weighting factors for multi-channel correlation.
119 * To be indexed by the Rice coded indices.
121 static const int16_t mcc_weightings[] = {
122 204, 192, 179, 166, 153, 140, 128, 115,
123 102, 89, 76, 64, 51, 38, 25, 12,
124 0, -12, -25, -38, -51, -64, -76, -89,
125 -102, -115, -128, -140, -153, -166, -179, -192
129 /** Tail codes used in arithmetic coding using block Gilbert-Moore codes.
131 static const uint8_t tail_code[16][6] = {
132 { 74, 44, 25, 13, 7, 3},
133 { 68, 42, 24, 13, 7, 3},
134 { 58, 39, 23, 13, 7, 3},
135 {126, 70, 37, 19, 10, 5},
136 {132, 70, 37, 20, 10, 5},
137 {124, 70, 38, 20, 10, 5},
138 {120, 69, 37, 20, 11, 5},
139 {116, 67, 37, 20, 11, 5},
140 {108, 66, 36, 20, 10, 5},
141 {102, 62, 36, 20, 10, 5},
142 { 88, 58, 34, 19, 10, 5},
143 {162, 89, 49, 25, 13, 7},
144 {156, 87, 49, 26, 14, 7},
145 {150, 86, 47, 26, 14, 7},
146 {142, 84, 47, 26, 14, 7},
147 {131, 79, 46, 26, 14, 7}
158 typedef struct ALSSpecificConfig {
159 uint32_t samples; ///< number of samples, 0xFFFFFFFF if unknown
160 int resolution; ///< 000 = 8-bit; 001 = 16-bit; 010 = 24-bit; 011 = 32-bit
161 int floating; ///< 1 = IEEE 32-bit floating-point, 0 = integer
162 int msb_first; ///< 1 = original CRC calculated on big-endian system, 0 = little-endian
163 int frame_length; ///< frame length for each frame (last frame may differ)
164 int ra_distance; ///< distance between RA frames (in frames, 0...255)
165 enum RA_Flag ra_flag; ///< indicates where the size of ra units is stored
166 int adapt_order; ///< adaptive order: 1 = on, 0 = off
167 int coef_table; ///< table index of Rice code parameters
168 int long_term_prediction; ///< long term prediction (LTP): 1 = on, 0 = off
169 int max_order; ///< maximum prediction order (0..1023)
170 int block_switching; ///< number of block switching levels
171 int bgmc; ///< "Block Gilbert-Moore Code": 1 = on, 0 = off (Rice coding only)
172 int sb_part; ///< sub-block partition
173 int joint_stereo; ///< joint stereo: 1 = on, 0 = off
174 int mc_coding; ///< extended inter-channel coding (multi channel coding): 1 = on, 0 = off
175 int chan_config; ///< indicates that a chan_config_info field is present
176 int chan_sort; ///< channel rearrangement: 1 = on, 0 = off
177 int rlslms; ///< use "Recursive Least Square-Least Mean Square" predictor: 1 = on, 0 = off
178 int chan_config_info; ///< mapping of channels to loudspeaker locations. Unused until setting channel configuration is implemented.
179 int *chan_pos; ///< original channel positions
180 int crc_enabled; ///< enable Cyclic Redundancy Checksum
184 typedef struct ALSChannelData {
194 typedef struct ALSDecContext {
195 AVCodecContext *avctx;
196 ALSSpecificConfig sconf;
198 BswapDSPContext bdsp;
199 const AVCRC *crc_table;
200 uint32_t crc_org; ///< CRC value of the original input data
201 uint32_t crc; ///< CRC value calculated from decoded data
202 unsigned int cur_frame_length; ///< length of the current frame to decode
203 unsigned int frame_id; ///< the frame ID / number of the current frame
204 unsigned int js_switch; ///< if true, joint-stereo decoding is enforced
205 unsigned int cs_switch; ///< if true, channel rearrangement is done
206 unsigned int num_blocks; ///< number of blocks used in the current frame
207 unsigned int s_max; ///< maximum Rice parameter allowed in entropy coding
208 uint8_t *bgmc_lut; ///< pointer at lookup tables used for BGMC
209 int *bgmc_lut_status; ///< pointer at lookup table status flags used for BGMC
210 int ltp_lag_length; ///< number of bits used for ltp lag value
211 int *const_block; ///< contains const_block flags for all channels
212 unsigned int *shift_lsbs; ///< contains shift_lsbs flags for all channels
213 unsigned int *opt_order; ///< contains opt_order flags for all channels
214 int *store_prev_samples; ///< contains store_prev_samples flags for all channels
215 int *use_ltp; ///< contains use_ltp flags for all channels
216 int *ltp_lag; ///< contains ltp lag values for all channels
217 int **ltp_gain; ///< gain values for ltp 5-tap filter for a channel
218 int *ltp_gain_buffer; ///< contains all gain values for ltp 5-tap filter
219 int32_t **quant_cof; ///< quantized parcor coefficients for a channel
220 int32_t *quant_cof_buffer; ///< contains all quantized parcor coefficients
221 int32_t **lpc_cof; ///< coefficients of the direct form prediction filter for a channel
222 int32_t *lpc_cof_buffer; ///< contains all coefficients of the direct form prediction filter
223 int32_t *lpc_cof_reversed_buffer; ///< temporary buffer to set up a reversed versio of lpc_cof_buffer
224 ALSChannelData **chan_data; ///< channel data for multi-channel correlation
225 ALSChannelData *chan_data_buffer; ///< contains channel data for all channels
226 int *reverted_channels; ///< stores a flag for each reverted channel
227 int32_t *prev_raw_samples; ///< contains unshifted raw samples from the previous block
228 int32_t **raw_samples; ///< decoded raw samples for each channel
229 int32_t *raw_buffer; ///< contains all decoded raw samples including carryover samples
230 uint8_t *crc_buffer; ///< buffer of byte order corrected samples used for CRC check
231 MLZ* mlz; ///< masked lz decompression structure
232 SoftFloat_IEEE754 *acf; ///< contains common multiplier for all channels
233 int *last_acf_mantissa; ///< contains the last acf mantissa data of common multiplier for all channels
234 int *shift_value; ///< value by which the binary point is to be shifted for all channels
235 int *last_shift_value; ///< contains last shift value for all channels
236 int **raw_mantissa; ///< decoded mantissa bits of the difference signal
237 unsigned char *larray; ///< buffer to store the output of masked lz decompression
238 int *nbits; ///< contains the number of bits to read for masked lz decompression for all samples
242 typedef struct ALSBlockData {
243 unsigned int block_length; ///< number of samples within the block
244 unsigned int ra_block; ///< if true, this is a random access block
245 int *const_block; ///< if true, this is a constant value block
246 int js_blocks; ///< true if this block contains a difference signal
247 unsigned int *shift_lsbs; ///< shift of values for this block
248 unsigned int *opt_order; ///< prediction order of this block
249 int *store_prev_samples;///< if true, carryover samples have to be stored
250 int *use_ltp; ///< if true, long-term prediction is used
251 int *ltp_lag; ///< lag value for long-term prediction
252 int *ltp_gain; ///< gain values for ltp 5-tap filter
253 int32_t *quant_cof; ///< quantized parcor coefficients
254 int32_t *lpc_cof; ///< coefficients of the direct form prediction
255 int32_t *raw_samples; ///< decoded raw samples / residuals for this block
256 int32_t *prev_raw_samples; ///< contains unshifted raw samples from the previous block
257 int32_t *raw_other; ///< decoded raw samples of the other channel of a channel pair
261 static av_cold void dprint_specific_config(ALSDecContext *ctx)
264 AVCodecContext *avctx = ctx->avctx;
265 ALSSpecificConfig *sconf = &ctx->sconf;
267 ff_dlog(avctx, "resolution = %i\n", sconf->resolution);
268 ff_dlog(avctx, "floating = %i\n", sconf->floating);
269 ff_dlog(avctx, "frame_length = %i\n", sconf->frame_length);
270 ff_dlog(avctx, "ra_distance = %i\n", sconf->ra_distance);
271 ff_dlog(avctx, "ra_flag = %i\n", sconf->ra_flag);
272 ff_dlog(avctx, "adapt_order = %i\n", sconf->adapt_order);
273 ff_dlog(avctx, "coef_table = %i\n", sconf->coef_table);
274 ff_dlog(avctx, "long_term_prediction = %i\n", sconf->long_term_prediction);
275 ff_dlog(avctx, "max_order = %i\n", sconf->max_order);
276 ff_dlog(avctx, "block_switching = %i\n", sconf->block_switching);
277 ff_dlog(avctx, "bgmc = %i\n", sconf->bgmc);
278 ff_dlog(avctx, "sb_part = %i\n", sconf->sb_part);
279 ff_dlog(avctx, "joint_stereo = %i\n", sconf->joint_stereo);
280 ff_dlog(avctx, "mc_coding = %i\n", sconf->mc_coding);
281 ff_dlog(avctx, "chan_config = %i\n", sconf->chan_config);
282 ff_dlog(avctx, "chan_sort = %i\n", sconf->chan_sort);
283 ff_dlog(avctx, "RLSLMS = %i\n", sconf->rlslms);
284 ff_dlog(avctx, "chan_config_info = %i\n", sconf->chan_config_info);
289 /** Read an ALSSpecificConfig from a buffer into the output struct.
291 static av_cold int read_specific_config(ALSDecContext *ctx)
295 int i, config_offset;
296 MPEG4AudioConfig m4ac = {0};
297 ALSSpecificConfig *sconf = &ctx->sconf;
298 AVCodecContext *avctx = ctx->avctx;
299 uint32_t als_id, header_size, trailer_size;
302 if ((ret = init_get_bits8(&gb, avctx->extradata, avctx->extradata_size)) < 0)
305 config_offset = avpriv_mpeg4audio_get_config(&m4ac, avctx->extradata,
306 avctx->extradata_size * 8, 1);
308 if (config_offset < 0)
309 return AVERROR_INVALIDDATA;
311 skip_bits_long(&gb, config_offset);
313 if (get_bits_left(&gb) < (30 << 3))
314 return AVERROR_INVALIDDATA;
316 // read the fixed items
317 als_id = get_bits_long(&gb, 32);
318 avctx->sample_rate = m4ac.sample_rate;
319 skip_bits_long(&gb, 32); // sample rate already known
320 sconf->samples = get_bits_long(&gb, 32);
321 avctx->channels = m4ac.channels;
322 skip_bits(&gb, 16); // number of channels already known
323 skip_bits(&gb, 3); // skip file_type
324 sconf->resolution = get_bits(&gb, 3);
325 sconf->floating = get_bits1(&gb);
326 sconf->msb_first = get_bits1(&gb);
327 sconf->frame_length = get_bits(&gb, 16) + 1;
328 sconf->ra_distance = get_bits(&gb, 8);
329 sconf->ra_flag = get_bits(&gb, 2);
330 sconf->adapt_order = get_bits1(&gb);
331 sconf->coef_table = get_bits(&gb, 2);
332 sconf->long_term_prediction = get_bits1(&gb);
333 sconf->max_order = get_bits(&gb, 10);
334 sconf->block_switching = get_bits(&gb, 2);
335 sconf->bgmc = get_bits1(&gb);
336 sconf->sb_part = get_bits1(&gb);
337 sconf->joint_stereo = get_bits1(&gb);
338 sconf->mc_coding = get_bits1(&gb);
339 sconf->chan_config = get_bits1(&gb);
340 sconf->chan_sort = get_bits1(&gb);
341 sconf->crc_enabled = get_bits1(&gb);
342 sconf->rlslms = get_bits1(&gb);
343 skip_bits(&gb, 5); // skip 5 reserved bits
344 skip_bits1(&gb); // skip aux_data_enabled
347 // check for ALSSpecificConfig struct
348 if (als_id != MKBETAG('A','L','S','\0'))
349 return AVERROR_INVALIDDATA;
351 ctx->cur_frame_length = sconf->frame_length;
353 // read channel config
354 if (sconf->chan_config)
355 sconf->chan_config_info = get_bits(&gb, 16);
356 // TODO: use this to set avctx->channel_layout
359 // read channel sorting
360 if (sconf->chan_sort && avctx->channels > 1) {
361 int chan_pos_bits = av_ceil_log2(avctx->channels);
362 int bits_needed = avctx->channels * chan_pos_bits + 7;
363 if (get_bits_left(&gb) < bits_needed)
364 return AVERROR_INVALIDDATA;
366 if (!(sconf->chan_pos = av_malloc_array(avctx->channels, sizeof(*sconf->chan_pos))))
367 return AVERROR(ENOMEM);
371 for (i = 0; i < avctx->channels; i++) {
372 sconf->chan_pos[i] = -1;
375 for (i = 0; i < avctx->channels; i++) {
378 idx = get_bits(&gb, chan_pos_bits);
379 if (idx >= avctx->channels || sconf->chan_pos[idx] != -1) {
380 av_log(avctx, AV_LOG_WARNING, "Invalid channel reordering.\n");
384 sconf->chan_pos[idx] = i;
391 // read fixed header and trailer sizes,
392 // if size = 0xFFFFFFFF then there is no data field!
393 if (get_bits_left(&gb) < 64)
394 return AVERROR_INVALIDDATA;
396 header_size = get_bits_long(&gb, 32);
397 trailer_size = get_bits_long(&gb, 32);
398 if (header_size == 0xFFFFFFFF)
400 if (trailer_size == 0xFFFFFFFF)
403 ht_size = ((int64_t)(header_size) + (int64_t)(trailer_size)) << 3;
406 // skip the header and trailer data
407 if (get_bits_left(&gb) < ht_size)
408 return AVERROR_INVALIDDATA;
410 if (ht_size > INT32_MAX)
411 return AVERROR_PATCHWELCOME;
413 skip_bits_long(&gb, ht_size);
416 // initialize CRC calculation
417 if (sconf->crc_enabled) {
418 if (get_bits_left(&gb) < 32)
419 return AVERROR_INVALIDDATA;
421 if (avctx->err_recognition & (AV_EF_CRCCHECK|AV_EF_CAREFUL)) {
422 ctx->crc_table = av_crc_get_table(AV_CRC_32_IEEE_LE);
423 ctx->crc = 0xFFFFFFFF;
424 ctx->crc_org = ~get_bits_long(&gb, 32);
426 skip_bits_long(&gb, 32);
430 // no need to read the rest of ALSSpecificConfig (ra_unit_size & aux data)
432 dprint_specific_config(ctx);
438 /** Check the ALSSpecificConfig for unsupported features.
440 static int check_specific_config(ALSDecContext *ctx)
442 ALSSpecificConfig *sconf = &ctx->sconf;
445 // report unsupported feature and set error value
446 #define MISSING_ERR(cond, str, errval) \
449 avpriv_report_missing_feature(ctx->avctx, \
455 MISSING_ERR(sconf->rlslms, "Adaptive RLS-LMS prediction", AVERROR_PATCHWELCOME);
461 /** Parse the bs_info field to extract the block partitioning used in
462 * block switching mode, refer to ISO/IEC 14496-3, section 11.6.2.
464 static void parse_bs_info(const uint32_t bs_info, unsigned int n,
465 unsigned int div, unsigned int **div_blocks,
466 unsigned int *num_blocks)
468 if (n < 31 && ((bs_info << n) & 0x40000000)) {
469 // if the level is valid and the investigated bit n is set
470 // then recursively check both children at bits (2n+1) and (2n+2)
473 parse_bs_info(bs_info, n + 1, div, div_blocks, num_blocks);
474 parse_bs_info(bs_info, n + 2, div, div_blocks, num_blocks);
476 // else the bit is not set or the last level has been reached
477 // (bit implicitly not set)
485 /** Read and decode a Rice codeword.
487 static int32_t decode_rice(GetBitContext *gb, unsigned int k)
489 int max = get_bits_left(gb) - k;
490 int q = get_unary(gb, 0, max);
491 int r = k ? get_bits1(gb) : !(q & 1);
495 q += get_bits_long(gb, k - 1);
503 /** Convert PARCOR coefficient k to direct filter coefficient.
505 static void parcor_to_lpc(unsigned int k, const int32_t *par, int32_t *cof)
509 for (i = 0, j = k - 1; i < j; i++, j--) {
510 int tmp1 = ((MUL64(par[k], cof[j]) + (1 << 19)) >> 20);
511 cof[j] += ((MUL64(par[k], cof[i]) + (1 << 19)) >> 20);
515 cof[i] += ((MUL64(par[k], cof[j]) + (1 << 19)) >> 20);
521 /** Read block switching field if necessary and set actual block sizes.
522 * Also assure that the block sizes of the last frame correspond to the
523 * actual number of samples.
525 static void get_block_sizes(ALSDecContext *ctx, unsigned int *div_blocks,
528 ALSSpecificConfig *sconf = &ctx->sconf;
529 GetBitContext *gb = &ctx->gb;
530 unsigned int *ptr_div_blocks = div_blocks;
533 if (sconf->block_switching) {
534 unsigned int bs_info_len = 1 << (sconf->block_switching + 2);
535 *bs_info = get_bits_long(gb, bs_info_len);
536 *bs_info <<= (32 - bs_info_len);
540 parse_bs_info(*bs_info, 0, 0, &ptr_div_blocks, &ctx->num_blocks);
542 // The last frame may have an overdetermined block structure given in
543 // the bitstream. In that case the defined block structure would need
544 // more samples than available to be consistent.
545 // The block structure is actually used but the block sizes are adapted
546 // to fit the actual number of available samples.
547 // Example: 5 samples, 2nd level block sizes: 2 2 2 2.
548 // This results in the actual block sizes: 2 2 1 0.
549 // This is not specified in 14496-3 but actually done by the reference
550 // codec RM22 revision 2.
551 // This appears to happen in case of an odd number of samples in the last
552 // frame which is actually not allowed by the block length switching part
554 // The ALS conformance files feature an odd number of samples in the last
557 for (b = 0; b < ctx->num_blocks; b++)
558 div_blocks[b] = ctx->sconf.frame_length >> div_blocks[b];
560 if (ctx->cur_frame_length != ctx->sconf.frame_length) {
561 unsigned int remaining = ctx->cur_frame_length;
563 for (b = 0; b < ctx->num_blocks; b++) {
564 if (remaining <= div_blocks[b]) {
565 div_blocks[b] = remaining;
566 ctx->num_blocks = b + 1;
570 remaining -= div_blocks[b];
576 /** Read the block data for a constant block
578 static int read_const_block_data(ALSDecContext *ctx, ALSBlockData *bd)
580 ALSSpecificConfig *sconf = &ctx->sconf;
581 AVCodecContext *avctx = ctx->avctx;
582 GetBitContext *gb = &ctx->gb;
584 if (bd->block_length <= 0)
585 return AVERROR_INVALIDDATA;
587 *bd->raw_samples = 0;
588 *bd->const_block = get_bits1(gb); // 1 = constant value, 0 = zero block (silence)
589 bd->js_blocks = get_bits1(gb);
591 // skip 5 reserved bits
594 if (*bd->const_block) {
595 unsigned int const_val_bits = sconf->floating ? 24 : avctx->bits_per_raw_sample;
596 *bd->raw_samples = get_sbits_long(gb, const_val_bits);
599 // ensure constant block decoding by reusing this field
600 *bd->const_block = 1;
606 /** Decode the block data for a constant block
608 static void decode_const_block_data(ALSDecContext *ctx, ALSBlockData *bd)
610 int smp = bd->block_length - 1;
611 int32_t val = *bd->raw_samples;
612 int32_t *dst = bd->raw_samples + 1;
614 // write raw samples into buffer
620 /** Read the block data for a non-constant block
622 static int read_var_block_data(ALSDecContext *ctx, ALSBlockData *bd)
624 ALSSpecificConfig *sconf = &ctx->sconf;
625 AVCodecContext *avctx = ctx->avctx;
626 GetBitContext *gb = &ctx->gb;
630 unsigned int sub_blocks, log2_sub_blocks, sb_length;
631 unsigned int start = 0;
632 unsigned int opt_order;
634 int32_t *quant_cof = bd->quant_cof;
635 int32_t *current_res;
638 // ensure variable block decoding by reusing this field
639 *bd->const_block = 0;
642 bd->js_blocks = get_bits1(gb);
644 opt_order = *bd->opt_order;
646 // determine the number of subblocks for entropy decoding
647 if (!sconf->bgmc && !sconf->sb_part) {
650 if (sconf->bgmc && sconf->sb_part)
651 log2_sub_blocks = get_bits(gb, 2);
653 log2_sub_blocks = 2 * get_bits1(gb);
656 sub_blocks = 1 << log2_sub_blocks;
658 // do not continue in case of a damaged stream since
659 // block_length must be evenly divisible by sub_blocks
660 if (bd->block_length & (sub_blocks - 1)) {
661 av_log(avctx, AV_LOG_WARNING,
662 "Block length is not evenly divisible by the number of subblocks.\n");
663 return AVERROR_INVALIDDATA;
666 sb_length = bd->block_length >> log2_sub_blocks;
669 s[0] = get_bits(gb, 8 + (sconf->resolution > 1));
670 for (k = 1; k < sub_blocks; k++)
671 s[k] = s[k - 1] + decode_rice(gb, 2);
673 for (k = 0; k < sub_blocks; k++) {
678 s[0] = get_bits(gb, 4 + (sconf->resolution > 1));
679 for (k = 1; k < sub_blocks; k++)
680 s[k] = s[k - 1] + decode_rice(gb, 0);
682 for (k = 1; k < sub_blocks; k++)
684 av_log(avctx, AV_LOG_ERROR, "k invalid for rice code.\n");
685 return AVERROR_INVALIDDATA;
689 *bd->shift_lsbs = get_bits(gb, 4) + 1;
691 *bd->store_prev_samples = (bd->js_blocks && bd->raw_other) || *bd->shift_lsbs;
694 if (!sconf->rlslms) {
695 if (sconf->adapt_order && sconf->max_order) {
696 int opt_order_length = av_ceil_log2(av_clip((bd->block_length >> 3) - 1,
697 2, sconf->max_order + 1));
698 *bd->opt_order = get_bits(gb, opt_order_length);
699 if (*bd->opt_order > sconf->max_order) {
700 *bd->opt_order = sconf->max_order;
701 av_log(avctx, AV_LOG_ERROR, "Predictor order too large.\n");
702 return AVERROR_INVALIDDATA;
705 *bd->opt_order = sconf->max_order;
707 if (*bd->opt_order > bd->block_length) {
708 *bd->opt_order = bd->block_length;
709 av_log(avctx, AV_LOG_ERROR, "Predictor order too large.\n");
710 return AVERROR_INVALIDDATA;
712 opt_order = *bd->opt_order;
717 if (sconf->coef_table == 3) {
720 // read coefficient 0
721 quant_cof[0] = 32 * parcor_scaled_values[get_bits(gb, 7)];
723 // read coefficient 1
725 quant_cof[1] = -32 * parcor_scaled_values[get_bits(gb, 7)];
727 // read coefficients 2 to opt_order
728 for (k = 2; k < opt_order; k++)
729 quant_cof[k] = get_bits(gb, 7);
734 // read coefficient 0 to 19
735 k_max = FFMIN(opt_order, 20);
736 for (k = 0; k < k_max; k++) {
737 int rice_param = parcor_rice_table[sconf->coef_table][k][1];
738 int offset = parcor_rice_table[sconf->coef_table][k][0];
739 quant_cof[k] = decode_rice(gb, rice_param) + offset;
740 if (quant_cof[k] < -64 || quant_cof[k] > 63) {
741 av_log(avctx, AV_LOG_ERROR,
742 "quant_cof %"PRId32" is out of range.\n",
744 return AVERROR_INVALIDDATA;
748 // read coefficients 20 to 126
749 k_max = FFMIN(opt_order, 127);
750 for (; k < k_max; k++)
751 quant_cof[k] = decode_rice(gb, 2) + (k & 1);
753 // read coefficients 127 to opt_order
754 for (; k < opt_order; k++)
755 quant_cof[k] = decode_rice(gb, 1);
757 quant_cof[0] = 32 * parcor_scaled_values[quant_cof[0] + 64];
760 quant_cof[1] = -32 * parcor_scaled_values[quant_cof[1] + 64];
763 for (k = 2; k < opt_order; k++)
764 quant_cof[k] = (quant_cof[k] * (1 << 14)) + (add_base << 13);
768 // read LTP gain and lag values
769 if (sconf->long_term_prediction) {
770 *bd->use_ltp = get_bits1(gb);
775 bd->ltp_gain[0] = decode_rice(gb, 1) << 3;
776 bd->ltp_gain[1] = decode_rice(gb, 2) << 3;
778 r = get_unary(gb, 0, 4);
781 av_log(avctx, AV_LOG_ERROR, "r overflow\n");
782 return AVERROR_INVALIDDATA;
785 bd->ltp_gain[2] = ltp_gain_values[r][c];
787 bd->ltp_gain[3] = decode_rice(gb, 2) << 3;
788 bd->ltp_gain[4] = decode_rice(gb, 1) << 3;
790 *bd->ltp_lag = get_bits(gb, ctx->ltp_lag_length);
791 *bd->ltp_lag += FFMAX(4, opt_order + 1);
795 // read first value and residuals in case of a random access block
798 bd->raw_samples[0] = decode_rice(gb, avctx->bits_per_raw_sample - 4);
800 bd->raw_samples[1] = decode_rice(gb, FFMIN(s[0] + 3, ctx->s_max));
802 bd->raw_samples[2] = decode_rice(gb, FFMIN(s[0] + 1, ctx->s_max));
804 start = FFMIN(opt_order, 3);
807 // read all residuals
811 unsigned int b = av_clip((av_ceil_log2(bd->block_length) - 3) >> 1, 0, 5);
813 // read most significant bits
818 ff_bgmc_decode_init(gb, &high, &low, &value);
820 current_res = bd->raw_samples + start;
822 for (sb = 0; sb < sub_blocks; sb++) {
823 unsigned int sb_len = sb_length - (sb ? 0 : start);
825 k [sb] = s[sb] > b ? s[sb] - b : 0;
826 delta[sb] = 5 - s[sb] + k[sb];
828 ff_bgmc_decode(gb, sb_len, current_res,
829 delta[sb], sx[sb], &high, &low, &value, ctx->bgmc_lut, ctx->bgmc_lut_status);
831 current_res += sb_len;
834 ff_bgmc_decode_end(gb);
837 // read least significant bits and tails
838 current_res = bd->raw_samples + start;
840 for (sb = 0; sb < sub_blocks; sb++, start = 0) {
841 unsigned int cur_tail_code = tail_code[sx[sb]][delta[sb]];
842 unsigned int cur_k = k[sb];
843 unsigned int cur_s = s[sb];
845 for (; start < sb_length; start++) {
846 int32_t res = *current_res;
848 if (res == cur_tail_code) {
849 unsigned int max_msb = (2 + (sx[sb] > 2) + (sx[sb] > 10))
852 res = decode_rice(gb, cur_s);
855 res += (max_msb ) << cur_k;
857 res -= (max_msb - 1) << cur_k;
860 if (res > cur_tail_code)
870 res |= get_bits_long(gb, cur_k);
874 *current_res++ = res;
878 current_res = bd->raw_samples + start;
880 for (sb = 0; sb < sub_blocks; sb++, start = 0)
881 for (; start < sb_length; start++)
882 *current_res++ = decode_rice(gb, s[sb]);
889 /** Decode the block data for a non-constant block
891 static int decode_var_block_data(ALSDecContext *ctx, ALSBlockData *bd)
893 ALSSpecificConfig *sconf = &ctx->sconf;
894 unsigned int block_length = bd->block_length;
895 unsigned int smp = 0;
897 int opt_order = *bd->opt_order;
900 int32_t *quant_cof = bd->quant_cof;
901 int32_t *lpc_cof = bd->lpc_cof;
902 int32_t *raw_samples = bd->raw_samples;
903 int32_t *raw_samples_end = bd->raw_samples + bd->block_length;
904 int32_t *lpc_cof_reversed = ctx->lpc_cof_reversed_buffer;
906 // reverse long-term prediction
910 for (ltp_smp = FFMAX(*bd->ltp_lag - 2, 0); ltp_smp < block_length; ltp_smp++) {
911 int center = ltp_smp - *bd->ltp_lag;
912 int begin = FFMAX(0, center - 2);
913 int end = center + 3;
914 int tab = 5 - (end - begin);
919 for (base = begin; base < end; base++, tab++)
920 y += MUL64(bd->ltp_gain[tab], raw_samples[base]);
922 raw_samples[ltp_smp] += y >> 7;
926 // reconstruct all samples from residuals
928 for (smp = 0; smp < opt_order; smp++) {
931 for (sb = 0; sb < smp; sb++)
932 y += MUL64(lpc_cof[sb], raw_samples[-(sb + 1)]);
934 *raw_samples++ -= y >> 20;
935 parcor_to_lpc(smp, quant_cof, lpc_cof);
938 for (k = 0; k < opt_order; k++)
939 parcor_to_lpc(k, quant_cof, lpc_cof);
941 // store previous samples in case that they have to be altered
942 if (*bd->store_prev_samples)
943 memcpy(bd->prev_raw_samples, raw_samples - sconf->max_order,
944 sizeof(*bd->prev_raw_samples) * sconf->max_order);
946 // reconstruct difference signal for prediction (joint-stereo)
947 if (bd->js_blocks && bd->raw_other) {
948 int32_t *left, *right;
950 if (bd->raw_other > raw_samples) { // D = R - L
952 right = bd->raw_other;
953 } else { // D = R - L
954 left = bd->raw_other;
958 for (sb = -1; sb >= -sconf->max_order; sb--)
959 raw_samples[sb] = right[sb] - left[sb];
962 // reconstruct shifted signal
964 for (sb = -1; sb >= -sconf->max_order; sb--)
965 raw_samples[sb] >>= *bd->shift_lsbs;
968 // reverse linear prediction coefficients for efficiency
969 lpc_cof = lpc_cof + opt_order;
971 for (sb = 0; sb < opt_order; sb++)
972 lpc_cof_reversed[sb] = lpc_cof[-(sb + 1)];
974 // reconstruct raw samples
975 raw_samples = bd->raw_samples + smp;
976 lpc_cof = lpc_cof_reversed + opt_order;
978 for (; raw_samples < raw_samples_end; raw_samples++) {
981 for (sb = -opt_order; sb < 0; sb++)
982 y += MUL64(lpc_cof[sb], raw_samples[sb]);
984 *raw_samples -= y >> 20;
987 raw_samples = bd->raw_samples;
989 // restore previous samples in case that they have been altered
990 if (*bd->store_prev_samples)
991 memcpy(raw_samples - sconf->max_order, bd->prev_raw_samples,
992 sizeof(*raw_samples) * sconf->max_order);
998 /** Read the block data.
1000 static int read_block(ALSDecContext *ctx, ALSBlockData *bd)
1003 GetBitContext *gb = &ctx->gb;
1004 ALSSpecificConfig *sconf = &ctx->sconf;
1006 *bd->shift_lsbs = 0;
1007 // read block type flag and read the samples accordingly
1008 if (get_bits1(gb)) {
1009 ret = read_var_block_data(ctx, bd);
1011 ret = read_const_block_data(ctx, bd);
1014 if (!sconf->mc_coding || ctx->js_switch)
1021 /** Decode the block data.
1023 static int decode_block(ALSDecContext *ctx, ALSBlockData *bd)
1028 // read block type flag and read the samples accordingly
1029 if (*bd->const_block)
1030 decode_const_block_data(ctx, bd);
1032 ret = decode_var_block_data(ctx, bd); // always return 0
1037 // TODO: read RLSLMS extension data
1039 if (*bd->shift_lsbs)
1040 for (smp = 0; smp < bd->block_length; smp++)
1041 bd->raw_samples[smp] <<= *bd->shift_lsbs;
1047 /** Read and decode block data successively.
1049 static int read_decode_block(ALSDecContext *ctx, ALSBlockData *bd)
1053 if ((ret = read_block(ctx, bd)) < 0)
1056 return decode_block(ctx, bd);
1060 /** Compute the number of samples left to decode for the current frame and
1061 * sets these samples to zero.
1063 static void zero_remaining(unsigned int b, unsigned int b_max,
1064 const unsigned int *div_blocks, int32_t *buf)
1066 unsigned int count = 0;
1069 count += div_blocks[b++];
1072 memset(buf, 0, sizeof(*buf) * count);
1076 /** Decode blocks independently.
1078 static int decode_blocks_ind(ALSDecContext *ctx, unsigned int ra_frame,
1079 unsigned int c, const unsigned int *div_blocks,
1080 unsigned int *js_blocks)
1084 ALSBlockData bd = { 0 };
1086 bd.ra_block = ra_frame;
1087 bd.const_block = ctx->const_block;
1088 bd.shift_lsbs = ctx->shift_lsbs;
1089 bd.opt_order = ctx->opt_order;
1090 bd.store_prev_samples = ctx->store_prev_samples;
1091 bd.use_ltp = ctx->use_ltp;
1092 bd.ltp_lag = ctx->ltp_lag;
1093 bd.ltp_gain = ctx->ltp_gain[0];
1094 bd.quant_cof = ctx->quant_cof[0];
1095 bd.lpc_cof = ctx->lpc_cof[0];
1096 bd.prev_raw_samples = ctx->prev_raw_samples;
1097 bd.raw_samples = ctx->raw_samples[c];
1100 for (b = 0; b < ctx->num_blocks; b++) {
1101 bd.block_length = div_blocks[b];
1103 if ((ret = read_decode_block(ctx, &bd)) < 0) {
1104 // damaged block, write zero for the rest of the frame
1105 zero_remaining(b, ctx->num_blocks, div_blocks, bd.raw_samples);
1108 bd.raw_samples += div_blocks[b];
1116 /** Decode blocks dependently.
1118 static int decode_blocks(ALSDecContext *ctx, unsigned int ra_frame,
1119 unsigned int c, const unsigned int *div_blocks,
1120 unsigned int *js_blocks)
1122 ALSSpecificConfig *sconf = &ctx->sconf;
1123 unsigned int offset = 0;
1126 ALSBlockData bd[2] = { { 0 } };
1128 bd[0].ra_block = ra_frame;
1129 bd[0].const_block = ctx->const_block;
1130 bd[0].shift_lsbs = ctx->shift_lsbs;
1131 bd[0].opt_order = ctx->opt_order;
1132 bd[0].store_prev_samples = ctx->store_prev_samples;
1133 bd[0].use_ltp = ctx->use_ltp;
1134 bd[0].ltp_lag = ctx->ltp_lag;
1135 bd[0].ltp_gain = ctx->ltp_gain[0];
1136 bd[0].quant_cof = ctx->quant_cof[0];
1137 bd[0].lpc_cof = ctx->lpc_cof[0];
1138 bd[0].prev_raw_samples = ctx->prev_raw_samples;
1139 bd[0].js_blocks = *js_blocks;
1141 bd[1].ra_block = ra_frame;
1142 bd[1].const_block = ctx->const_block;
1143 bd[1].shift_lsbs = ctx->shift_lsbs;
1144 bd[1].opt_order = ctx->opt_order;
1145 bd[1].store_prev_samples = ctx->store_prev_samples;
1146 bd[1].use_ltp = ctx->use_ltp;
1147 bd[1].ltp_lag = ctx->ltp_lag;
1148 bd[1].ltp_gain = ctx->ltp_gain[0];
1149 bd[1].quant_cof = ctx->quant_cof[0];
1150 bd[1].lpc_cof = ctx->lpc_cof[0];
1151 bd[1].prev_raw_samples = ctx->prev_raw_samples;
1152 bd[1].js_blocks = *(js_blocks + 1);
1154 // decode all blocks
1155 for (b = 0; b < ctx->num_blocks; b++) {
1158 bd[0].block_length = div_blocks[b];
1159 bd[1].block_length = div_blocks[b];
1161 bd[0].raw_samples = ctx->raw_samples[c ] + offset;
1162 bd[1].raw_samples = ctx->raw_samples[c + 1] + offset;
1164 bd[0].raw_other = bd[1].raw_samples;
1165 bd[1].raw_other = bd[0].raw_samples;
1167 if ((ret = read_decode_block(ctx, &bd[0])) < 0 ||
1168 (ret = read_decode_block(ctx, &bd[1])) < 0)
1171 // reconstruct joint-stereo blocks
1172 if (bd[0].js_blocks) {
1173 if (bd[1].js_blocks)
1174 av_log(ctx->avctx, AV_LOG_WARNING, "Invalid channel pair.\n");
1176 for (s = 0; s < div_blocks[b]; s++)
1177 bd[0].raw_samples[s] = bd[1].raw_samples[s] - bd[0].raw_samples[s];
1178 } else if (bd[1].js_blocks) {
1179 for (s = 0; s < div_blocks[b]; s++)
1180 bd[1].raw_samples[s] = bd[1].raw_samples[s] + bd[0].raw_samples[s];
1183 offset += div_blocks[b];
1188 // store carryover raw samples,
1189 // the others channel raw samples are stored by the calling function.
1190 memmove(ctx->raw_samples[c] - sconf->max_order,
1191 ctx->raw_samples[c] - sconf->max_order + sconf->frame_length,
1192 sizeof(*ctx->raw_samples[c]) * sconf->max_order);
1196 // damaged block, write zero for the rest of the frame
1197 zero_remaining(b, ctx->num_blocks, div_blocks, bd[0].raw_samples);
1198 zero_remaining(b, ctx->num_blocks, div_blocks, bd[1].raw_samples);
1202 static inline int als_weighting(GetBitContext *gb, int k, int off)
1204 int idx = av_clip(decode_rice(gb, k) + off,
1205 0, FF_ARRAY_ELEMS(mcc_weightings) - 1);
1206 return mcc_weightings[idx];
1209 /** Read the channel data.
1211 static int read_channel_data(ALSDecContext *ctx, ALSChannelData *cd, int c)
1213 GetBitContext *gb = &ctx->gb;
1214 ALSChannelData *current = cd;
1215 unsigned int channels = ctx->avctx->channels;
1218 while (entries < channels && !(current->stop_flag = get_bits1(gb))) {
1219 current->master_channel = get_bits_long(gb, av_ceil_log2(channels));
1221 if (current->master_channel >= channels) {
1222 av_log(ctx->avctx, AV_LOG_ERROR, "Invalid master channel.\n");
1223 return AVERROR_INVALIDDATA;
1226 if (current->master_channel != c) {
1227 current->time_diff_flag = get_bits1(gb);
1228 current->weighting[0] = als_weighting(gb, 1, 16);
1229 current->weighting[1] = als_weighting(gb, 2, 14);
1230 current->weighting[2] = als_weighting(gb, 1, 16);
1232 if (current->time_diff_flag) {
1233 current->weighting[3] = als_weighting(gb, 1, 16);
1234 current->weighting[4] = als_weighting(gb, 1, 16);
1235 current->weighting[5] = als_weighting(gb, 1, 16);
1237 current->time_diff_sign = get_bits1(gb);
1238 current->time_diff_index = get_bits(gb, ctx->ltp_lag_length - 3) + 3;
1246 if (entries == channels) {
1247 av_log(ctx->avctx, AV_LOG_ERROR, "Damaged channel data.\n");
1248 return AVERROR_INVALIDDATA;
1256 /** Recursively reverts the inter-channel correlation for a block.
1258 static int revert_channel_correlation(ALSDecContext *ctx, ALSBlockData *bd,
1259 ALSChannelData **cd, int *reverted,
1260 unsigned int offset, int c)
1262 ALSChannelData *ch = cd[c];
1263 unsigned int dep = 0;
1264 unsigned int channels = ctx->avctx->channels;
1265 unsigned int channel_size = ctx->sconf.frame_length + ctx->sconf.max_order;
1272 while (dep < channels && !ch[dep].stop_flag) {
1273 revert_channel_correlation(ctx, bd, cd, reverted, offset,
1274 ch[dep].master_channel);
1279 if (dep == channels) {
1280 av_log(ctx->avctx, AV_LOG_WARNING, "Invalid channel correlation.\n");
1281 return AVERROR_INVALIDDATA;
1284 bd->const_block = ctx->const_block + c;
1285 bd->shift_lsbs = ctx->shift_lsbs + c;
1286 bd->opt_order = ctx->opt_order + c;
1287 bd->store_prev_samples = ctx->store_prev_samples + c;
1288 bd->use_ltp = ctx->use_ltp + c;
1289 bd->ltp_lag = ctx->ltp_lag + c;
1290 bd->ltp_gain = ctx->ltp_gain[c];
1291 bd->lpc_cof = ctx->lpc_cof[c];
1292 bd->quant_cof = ctx->quant_cof[c];
1293 bd->raw_samples = ctx->raw_samples[c] + offset;
1295 for (dep = 0; !ch[dep].stop_flag; dep++) {
1297 ptrdiff_t begin = 1;
1298 ptrdiff_t end = bd->block_length - 1;
1300 int32_t *master = ctx->raw_samples[ch[dep].master_channel] + offset;
1302 if (ch[dep].master_channel == c)
1305 if (ch[dep].time_diff_flag) {
1306 int t = ch[dep].time_diff_index;
1308 if (ch[dep].time_diff_sign) {
1311 av_log(ctx->avctx, AV_LOG_ERROR, "begin %"PTRDIFF_SPECIFIER" smaller than time diff index %d.\n", begin, t);
1312 return AVERROR_INVALIDDATA;
1317 av_log(ctx->avctx, AV_LOG_ERROR, "end %"PTRDIFF_SPECIFIER" smaller than time diff index %d.\n", end, t);
1318 return AVERROR_INVALIDDATA;
1323 if (FFMIN(begin - 1, begin - 1 + t) < ctx->raw_buffer - master ||
1324 FFMAX(end + 1, end + 1 + t) > ctx->raw_buffer + channels * channel_size - master) {
1325 av_log(ctx->avctx, AV_LOG_ERROR,
1326 "sample pointer range [%p, %p] not contained in raw_buffer [%p, %p].\n",
1327 master + FFMIN(begin - 1, begin - 1 + t), master + FFMAX(end + 1, end + 1 + t),
1328 ctx->raw_buffer, ctx->raw_buffer + channels * channel_size);
1329 return AVERROR_INVALIDDATA;
1332 for (smp = begin; smp < end; smp++) {
1334 MUL64(ch[dep].weighting[0], master[smp - 1 ]) +
1335 MUL64(ch[dep].weighting[1], master[smp ]) +
1336 MUL64(ch[dep].weighting[2], master[smp + 1 ]) +
1337 MUL64(ch[dep].weighting[3], master[smp - 1 + t]) +
1338 MUL64(ch[dep].weighting[4], master[smp + t]) +
1339 MUL64(ch[dep].weighting[5], master[smp + 1 + t]);
1341 bd->raw_samples[smp] += y >> 7;
1345 if (begin - 1 < ctx->raw_buffer - master ||
1346 end + 1 > ctx->raw_buffer + channels * channel_size - master) {
1347 av_log(ctx->avctx, AV_LOG_ERROR,
1348 "sample pointer range [%p, %p] not contained in raw_buffer [%p, %p].\n",
1349 master + begin - 1, master + end + 1,
1350 ctx->raw_buffer, ctx->raw_buffer + channels * channel_size);
1351 return AVERROR_INVALIDDATA;
1354 for (smp = begin; smp < end; smp++) {
1356 MUL64(ch[dep].weighting[0], master[smp - 1]) +
1357 MUL64(ch[dep].weighting[1], master[smp ]) +
1358 MUL64(ch[dep].weighting[2], master[smp + 1]);
1360 bd->raw_samples[smp] += y >> 7;
1369 /** multiply two softfloats and handle the rounding off
1371 static SoftFloat_IEEE754 multiply(SoftFloat_IEEE754 a, SoftFloat_IEEE754 b) {
1372 uint64_t mantissa_temp;
1374 int cutoff_bit_count;
1375 unsigned char last_2_bits;
1376 unsigned int mantissa;
1378 uint32_t return_val = 0;
1381 sign = a.sign ^ b.sign;
1383 // Multiply mantissa bits in a 64-bit register
1384 mantissa_temp = (uint64_t)a.mant * (uint64_t)b.mant;
1385 mask_64 = (uint64_t)0x1 << 47;
1387 // Count the valid bit count
1388 while (!(mantissa_temp & mask_64) && mask_64) {
1394 cutoff_bit_count = bit_count - 24;
1395 if (cutoff_bit_count > 0) {
1396 last_2_bits = (unsigned char)(((unsigned int)mantissa_temp >> (cutoff_bit_count - 1)) & 0x3 );
1397 if ((last_2_bits == 0x3) || ((last_2_bits == 0x1) && ((unsigned int)mantissa_temp & ((0x1UL << (cutoff_bit_count - 1)) - 1)))) {
1399 mantissa_temp += (uint64_t)0x1 << cutoff_bit_count;
1403 mantissa = (unsigned int)(mantissa_temp >> cutoff_bit_count);
1405 // Need one more shift?
1406 if (mantissa & 0x01000000ul) {
1412 return_val = 0x80000000U;
1415 return_val |= (a.exp + b.exp + bit_count - 47) << 23;
1416 return_val |= mantissa;
1417 return av_bits2sf_ieee754(return_val);
1421 /** Read and decode the floating point sample data
1423 static int read_diff_float_data(ALSDecContext *ctx, unsigned int ra_frame) {
1424 AVCodecContext *avctx = ctx->avctx;
1425 GetBitContext *gb = &ctx->gb;
1426 SoftFloat_IEEE754 *acf = ctx->acf;
1427 int *shift_value = ctx->shift_value;
1428 int *last_shift_value = ctx->last_shift_value;
1429 int *last_acf_mantissa = ctx->last_acf_mantissa;
1430 int **raw_mantissa = ctx->raw_mantissa;
1431 int *nbits = ctx->nbits;
1432 unsigned char *larray = ctx->larray;
1433 int frame_length = ctx->cur_frame_length;
1434 SoftFloat_IEEE754 scale = av_int2sf_ieee754(0x1u, 23);
1435 unsigned int partA_flag;
1436 unsigned int highest_byte;
1437 unsigned int shift_amp;
1451 skip_bits_long(gb, 32); //num_bytes_diff_float
1452 use_acf = get_bits1(gb);
1455 memset(last_acf_mantissa, 0, avctx->channels * sizeof(*last_acf_mantissa));
1456 memset(last_shift_value, 0, avctx->channels * sizeof(*last_shift_value) );
1457 ff_mlz_flush_dict(ctx->mlz);
1460 for (c = 0; c < avctx->channels; ++c) {
1463 if (get_bits1(gb)) {
1464 tmp_32 = get_bits(gb, 23);
1465 last_acf_mantissa[c] = tmp_32;
1467 tmp_32 = last_acf_mantissa[c];
1469 acf[c] = av_bits2sf_ieee754(tmp_32);
1474 highest_byte = get_bits(gb, 2);
1475 partA_flag = get_bits1(gb);
1476 shift_amp = get_bits1(gb);
1479 shift_value[c] = get_bits(gb, 8);
1480 last_shift_value[c] = shift_value[c];
1482 shift_value[c] = last_shift_value[c];
1486 if (!get_bits1(gb)) { //uncompressed
1487 for (i = 0; i < frame_length; ++i) {
1488 if (ctx->raw_samples[c][i] == 0) {
1489 ctx->raw_mantissa[c][i] = get_bits_long(gb, 32);
1492 } else { //compressed
1494 for (i = 0; i < frame_length; ++i) {
1495 if (ctx->raw_samples[c][i] == 0) {
1500 tmp_32 = ff_mlz_decompression(ctx->mlz, gb, nchars, larray);
1501 if(tmp_32 != nchars) {
1502 av_log(ctx->avctx, AV_LOG_ERROR, "Error in MLZ decompression (%"PRId32", %d).\n", tmp_32, nchars);
1503 return AVERROR_INVALIDDATA;
1506 for (i = 0; i < frame_length; ++i) {
1507 ctx->raw_mantissa[c][i] = AV_RB32(larray);
1514 for (i = 0; i < frame_length; ++i) {
1515 if (ctx->raw_samples[c][i] != 0) {
1516 //The following logic is taken from Tabel 14.45 and 14.46 from the ISO spec
1517 if (av_cmp_sf_ieee754(acf[c], FLOAT_1)) {
1518 nbits[i] = 23 - av_log2(abs(ctx->raw_samples[c][i]));
1522 nbits[i] = FFMIN(nbits[i], highest_byte*8);
1526 if (!get_bits1(gb)) { //uncompressed
1527 for (i = 0; i < frame_length; ++i) {
1528 if (ctx->raw_samples[c][i] != 0) {
1529 raw_mantissa[c][i] = get_bitsz(gb, nbits[i]);
1532 } else { //compressed
1534 for (i = 0; i < frame_length; ++i) {
1535 if (ctx->raw_samples[c][i]) {
1536 nchars += (int) nbits[i] / 8;
1543 tmp_32 = ff_mlz_decompression(ctx->mlz, gb, nchars, larray);
1544 if(tmp_32 != nchars) {
1545 av_log(ctx->avctx, AV_LOG_ERROR, "Error in MLZ decompression (%"PRId32", %d).\n", tmp_32, nchars);
1546 return AVERROR_INVALIDDATA;
1550 for (i = 0; i < frame_length; ++i) {
1551 if (ctx->raw_samples[c][i]) {
1553 nbits_aligned = 8 * ((unsigned int)(nbits[i] / 8) + 1);
1555 nbits_aligned = nbits[i];
1558 for (k = 0; k < nbits_aligned/8; ++k) {
1559 acc = (acc << 8) + larray[j++];
1561 acc >>= (nbits_aligned - nbits[i]);
1562 raw_mantissa[c][i] = acc;
1568 for (i = 0; i < frame_length; ++i) {
1569 SoftFloat_IEEE754 pcm_sf = av_int2sf_ieee754(ctx->raw_samples[c][i], 0);
1570 pcm_sf = av_div_sf_ieee754(pcm_sf, scale);
1572 if (ctx->raw_samples[c][i] != 0) {
1573 if (!av_cmp_sf_ieee754(acf[c], FLOAT_1)) {
1574 pcm_sf = multiply(acf[c], pcm_sf);
1579 mantissa = (pcm_sf.mant | 0x800000) + raw_mantissa[c][i];
1581 while(mantissa >= 0x1000000) {
1586 if (mantissa) e += (shift_value[c] - 127);
1587 mantissa &= 0x007fffffUL;
1589 tmp_32 = (sign << 31) | ((e + EXP_BIAS) << 23) | (mantissa);
1590 ctx->raw_samples[c][i] = tmp_32;
1592 ctx->raw_samples[c][i] = raw_mantissa[c][i] & 0x007fffffUL;
1601 /** Read the frame data.
1603 static int read_frame_data(ALSDecContext *ctx, unsigned int ra_frame)
1605 ALSSpecificConfig *sconf = &ctx->sconf;
1606 AVCodecContext *avctx = ctx->avctx;
1607 GetBitContext *gb = &ctx->gb;
1608 unsigned int div_blocks[32]; ///< block sizes.
1610 unsigned int js_blocks[2];
1611 uint32_t bs_info = 0;
1614 // skip the size of the ra unit if present in the frame
1615 if (sconf->ra_flag == RA_FLAG_FRAMES && ra_frame)
1616 skip_bits_long(gb, 32);
1618 if (sconf->mc_coding && sconf->joint_stereo) {
1619 ctx->js_switch = get_bits1(gb);
1623 if (!sconf->mc_coding || ctx->js_switch) {
1624 int independent_bs = !sconf->joint_stereo;
1626 for (c = 0; c < avctx->channels; c++) {
1630 get_block_sizes(ctx, div_blocks, &bs_info);
1632 // if joint_stereo and block_switching is set, independent decoding
1633 // is signaled via the first bit of bs_info
1634 if (sconf->joint_stereo && sconf->block_switching)
1638 // if this is the last channel, it has to be decoded independently
1639 if (c == avctx->channels - 1 || (c & 1))
1642 if (independent_bs) {
1643 ret = decode_blocks_ind(ctx, ra_frame, c,
1644 div_blocks, js_blocks);
1649 ret = decode_blocks(ctx, ra_frame, c, div_blocks, js_blocks);
1656 // store carryover raw samples
1657 memmove(ctx->raw_samples[c] - sconf->max_order,
1658 ctx->raw_samples[c] - sconf->max_order + sconf->frame_length,
1659 sizeof(*ctx->raw_samples[c]) * sconf->max_order);
1661 } else { // multi-channel coding
1662 ALSBlockData bd = { 0 };
1664 int *reverted_channels = ctx->reverted_channels;
1665 unsigned int offset = 0;
1667 for (c = 0; c < avctx->channels; c++)
1668 if (ctx->chan_data[c] < ctx->chan_data_buffer) {
1669 av_log(ctx->avctx, AV_LOG_ERROR, "Invalid channel data.\n");
1670 return AVERROR_INVALIDDATA;
1673 memset(reverted_channels, 0, sizeof(*reverted_channels) * avctx->channels);
1675 bd.ra_block = ra_frame;
1676 bd.prev_raw_samples = ctx->prev_raw_samples;
1678 get_block_sizes(ctx, div_blocks, &bs_info);
1680 for (b = 0; b < ctx->num_blocks; b++) {
1681 bd.block_length = div_blocks[b];
1682 if (bd.block_length <= 0) {
1683 av_log(ctx->avctx, AV_LOG_WARNING,
1684 "Invalid block length %u in channel data!\n",
1689 for (c = 0; c < avctx->channels; c++) {
1690 bd.const_block = ctx->const_block + c;
1691 bd.shift_lsbs = ctx->shift_lsbs + c;
1692 bd.opt_order = ctx->opt_order + c;
1693 bd.store_prev_samples = ctx->store_prev_samples + c;
1694 bd.use_ltp = ctx->use_ltp + c;
1695 bd.ltp_lag = ctx->ltp_lag + c;
1696 bd.ltp_gain = ctx->ltp_gain[c];
1697 bd.lpc_cof = ctx->lpc_cof[c];
1698 bd.quant_cof = ctx->quant_cof[c];
1699 bd.raw_samples = ctx->raw_samples[c] + offset;
1700 bd.raw_other = NULL;
1702 if ((ret = read_block(ctx, &bd)) < 0)
1704 if ((ret = read_channel_data(ctx, ctx->chan_data[c], c)) < 0)
1708 for (c = 0; c < avctx->channels; c++) {
1709 ret = revert_channel_correlation(ctx, &bd, ctx->chan_data,
1710 reverted_channels, offset, c);
1714 for (c = 0; c < avctx->channels; c++) {
1715 bd.const_block = ctx->const_block + c;
1716 bd.shift_lsbs = ctx->shift_lsbs + c;
1717 bd.opt_order = ctx->opt_order + c;
1718 bd.store_prev_samples = ctx->store_prev_samples + c;
1719 bd.use_ltp = ctx->use_ltp + c;
1720 bd.ltp_lag = ctx->ltp_lag + c;
1721 bd.ltp_gain = ctx->ltp_gain[c];
1722 bd.lpc_cof = ctx->lpc_cof[c];
1723 bd.quant_cof = ctx->quant_cof[c];
1724 bd.raw_samples = ctx->raw_samples[c] + offset;
1726 if ((ret = decode_block(ctx, &bd)) < 0)
1730 memset(reverted_channels, 0, avctx->channels * sizeof(*reverted_channels));
1731 offset += div_blocks[b];
1735 // store carryover raw samples
1736 for (c = 0; c < avctx->channels; c++)
1737 memmove(ctx->raw_samples[c] - sconf->max_order,
1738 ctx->raw_samples[c] - sconf->max_order + sconf->frame_length,
1739 sizeof(*ctx->raw_samples[c]) * sconf->max_order);
1742 if (sconf->floating) {
1743 read_diff_float_data(ctx, ra_frame);
1746 if (get_bits_left(gb) < 0) {
1747 av_log(ctx->avctx, AV_LOG_ERROR, "Overread %d\n", -get_bits_left(gb));
1748 return AVERROR_INVALIDDATA;
1755 /** Decode an ALS frame.
1757 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame_ptr,
1760 ALSDecContext *ctx = avctx->priv_data;
1761 AVFrame *frame = data;
1762 ALSSpecificConfig *sconf = &ctx->sconf;
1763 const uint8_t *buffer = avpkt->data;
1764 int buffer_size = avpkt->size;
1765 int invalid_frame, ret;
1766 unsigned int c, sample, ra_frame, bytes_read, shift;
1768 if ((ret = init_get_bits8(&ctx->gb, buffer, buffer_size)) < 0)
1771 // In the case that the distance between random access frames is set to zero
1772 // (sconf->ra_distance == 0) no frame is treated as a random access frame.
1773 // For the first frame, if prediction is used, all samples used from the
1774 // previous frame are assumed to be zero.
1775 ra_frame = sconf->ra_distance && !(ctx->frame_id % sconf->ra_distance);
1777 // the last frame to decode might have a different length
1778 if (sconf->samples != 0xFFFFFFFF)
1779 ctx->cur_frame_length = FFMIN(sconf->samples - ctx->frame_id * (uint64_t) sconf->frame_length,
1780 sconf->frame_length);
1782 ctx->cur_frame_length = sconf->frame_length;
1784 // decode the frame data
1785 if ((invalid_frame = read_frame_data(ctx, ra_frame)) < 0)
1786 av_log(ctx->avctx, AV_LOG_WARNING,
1787 "Reading frame data failed. Skipping RA unit.\n");
1791 /* get output buffer */
1792 frame->nb_samples = ctx->cur_frame_length;
1793 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
1796 // transform decoded frame into output format
1797 #define INTERLEAVE_OUTPUT(bps) \
1799 int##bps##_t *dest = (int##bps##_t*)frame->data[0]; \
1800 shift = bps - ctx->avctx->bits_per_raw_sample; \
1801 if (!ctx->cs_switch) { \
1802 for (sample = 0; sample < ctx->cur_frame_length; sample++) \
1803 for (c = 0; c < avctx->channels; c++) \
1804 *dest++ = ctx->raw_samples[c][sample] << shift; \
1806 for (sample = 0; sample < ctx->cur_frame_length; sample++) \
1807 for (c = 0; c < avctx->channels; c++) \
1808 *dest++ = ctx->raw_samples[sconf->chan_pos[c]][sample] << shift; \
1812 if (ctx->avctx->bits_per_raw_sample <= 16) {
1813 INTERLEAVE_OUTPUT(16)
1815 INTERLEAVE_OUTPUT(32)
1819 if (sconf->crc_enabled && (avctx->err_recognition & (AV_EF_CRCCHECK|AV_EF_CAREFUL))) {
1820 int swap = HAVE_BIGENDIAN != sconf->msb_first;
1822 if (ctx->avctx->bits_per_raw_sample == 24) {
1823 int32_t *src = (int32_t *)frame->data[0];
1826 sample < ctx->cur_frame_length * avctx->channels;
1831 v = av_bswap32(src[sample]);
1834 if (!HAVE_BIGENDIAN)
1837 ctx->crc = av_crc(ctx->crc_table, ctx->crc, (uint8_t*)(&v), 3);
1840 uint8_t *crc_source;
1843 if (ctx->avctx->bits_per_raw_sample <= 16) {
1844 int16_t *src = (int16_t*) frame->data[0];
1845 int16_t *dest = (int16_t*) ctx->crc_buffer;
1847 sample < ctx->cur_frame_length * avctx->channels;
1849 *dest++ = av_bswap16(src[sample]);
1851 ctx->bdsp.bswap_buf((uint32_t *) ctx->crc_buffer,
1852 (uint32_t *) frame->data[0],
1853 ctx->cur_frame_length * avctx->channels);
1855 crc_source = ctx->crc_buffer;
1857 crc_source = frame->data[0];
1860 ctx->crc = av_crc(ctx->crc_table, ctx->crc, crc_source,
1861 ctx->cur_frame_length * avctx->channels *
1862 av_get_bytes_per_sample(avctx->sample_fmt));
1866 // check CRC sums if this is the last frame
1867 if (ctx->cur_frame_length != sconf->frame_length &&
1868 ctx->crc_org != ctx->crc) {
1869 av_log(avctx, AV_LOG_ERROR, "CRC error.\n");
1870 if (avctx->err_recognition & AV_EF_EXPLODE)
1871 return AVERROR_INVALIDDATA;
1877 bytes_read = invalid_frame ? buffer_size :
1878 (get_bits_count(&ctx->gb) + 7) >> 3;
1884 /** Uninitialize the ALS decoder.
1886 static av_cold int decode_end(AVCodecContext *avctx)
1888 ALSDecContext *ctx = avctx->priv_data;
1891 av_freep(&ctx->sconf.chan_pos);
1893 ff_bgmc_end(&ctx->bgmc_lut, &ctx->bgmc_lut_status);
1895 av_freep(&ctx->const_block);
1896 av_freep(&ctx->shift_lsbs);
1897 av_freep(&ctx->opt_order);
1898 av_freep(&ctx->store_prev_samples);
1899 av_freep(&ctx->use_ltp);
1900 av_freep(&ctx->ltp_lag);
1901 av_freep(&ctx->ltp_gain);
1902 av_freep(&ctx->ltp_gain_buffer);
1903 av_freep(&ctx->quant_cof);
1904 av_freep(&ctx->lpc_cof);
1905 av_freep(&ctx->quant_cof_buffer);
1906 av_freep(&ctx->lpc_cof_buffer);
1907 av_freep(&ctx->lpc_cof_reversed_buffer);
1908 av_freep(&ctx->prev_raw_samples);
1909 av_freep(&ctx->raw_samples);
1910 av_freep(&ctx->raw_buffer);
1911 av_freep(&ctx->chan_data);
1912 av_freep(&ctx->chan_data_buffer);
1913 av_freep(&ctx->reverted_channels);
1914 av_freep(&ctx->crc_buffer);
1916 av_freep(&ctx->mlz->dict);
1917 av_freep(&ctx->mlz);
1919 av_freep(&ctx->acf);
1920 av_freep(&ctx->last_acf_mantissa);
1921 av_freep(&ctx->shift_value);
1922 av_freep(&ctx->last_shift_value);
1923 if (ctx->raw_mantissa) {
1924 for (i = 0; i < avctx->channels; i++) {
1925 av_freep(&ctx->raw_mantissa[i]);
1927 av_freep(&ctx->raw_mantissa);
1929 av_freep(&ctx->larray);
1930 av_freep(&ctx->nbits);
1936 /** Initialize the ALS decoder.
1938 static av_cold int decode_init(AVCodecContext *avctx)
1941 unsigned int channel_size;
1942 int num_buffers, ret;
1943 ALSDecContext *ctx = avctx->priv_data;
1944 ALSSpecificConfig *sconf = &ctx->sconf;
1947 if (!avctx->extradata) {
1948 av_log(avctx, AV_LOG_ERROR, "Missing required ALS extradata.\n");
1949 return AVERROR_INVALIDDATA;
1952 if ((ret = read_specific_config(ctx)) < 0) {
1953 av_log(avctx, AV_LOG_ERROR, "Reading ALSSpecificConfig failed.\n");
1957 if ((ret = check_specific_config(ctx)) < 0) {
1962 ret = ff_bgmc_init(avctx, &ctx->bgmc_lut, &ctx->bgmc_lut_status);
1966 if (sconf->floating) {
1967 avctx->sample_fmt = AV_SAMPLE_FMT_FLT;
1968 avctx->bits_per_raw_sample = 32;
1970 avctx->sample_fmt = sconf->resolution > 1
1971 ? AV_SAMPLE_FMT_S32 : AV_SAMPLE_FMT_S16;
1972 avctx->bits_per_raw_sample = (sconf->resolution + 1) * 8;
1973 if (avctx->bits_per_raw_sample > 32) {
1974 av_log(avctx, AV_LOG_ERROR, "Bits per raw sample %d larger than 32.\n",
1975 avctx->bits_per_raw_sample);
1976 ret = AVERROR_INVALIDDATA;
1981 // set maximum Rice parameter for progressive decoding based on resolution
1982 // This is not specified in 14496-3 but actually done by the reference
1983 // codec RM22 revision 2.
1984 ctx->s_max = sconf->resolution > 1 ? 31 : 15;
1986 // set lag value for long-term prediction
1987 ctx->ltp_lag_length = 8 + (avctx->sample_rate >= 96000) +
1988 (avctx->sample_rate >= 192000);
1990 // allocate quantized parcor coefficient buffer
1991 num_buffers = sconf->mc_coding ? avctx->channels : 1;
1993 ctx->quant_cof = av_malloc_array(num_buffers, sizeof(*ctx->quant_cof));
1994 ctx->lpc_cof = av_malloc_array(num_buffers, sizeof(*ctx->lpc_cof));
1995 ctx->quant_cof_buffer = av_malloc_array(num_buffers * sconf->max_order,
1996 sizeof(*ctx->quant_cof_buffer));
1997 ctx->lpc_cof_buffer = av_malloc_array(num_buffers * sconf->max_order,
1998 sizeof(*ctx->lpc_cof_buffer));
1999 ctx->lpc_cof_reversed_buffer = av_malloc_array(sconf->max_order,
2000 sizeof(*ctx->lpc_cof_buffer));
2002 if (!ctx->quant_cof || !ctx->lpc_cof ||
2003 !ctx->quant_cof_buffer || !ctx->lpc_cof_buffer ||
2004 !ctx->lpc_cof_reversed_buffer) {
2005 av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
2006 ret = AVERROR(ENOMEM);
2010 // assign quantized parcor coefficient buffers
2011 for (c = 0; c < num_buffers; c++) {
2012 ctx->quant_cof[c] = ctx->quant_cof_buffer + c * sconf->max_order;
2013 ctx->lpc_cof[c] = ctx->lpc_cof_buffer + c * sconf->max_order;
2016 // allocate and assign lag and gain data buffer for ltp mode
2017 ctx->const_block = av_malloc_array(num_buffers, sizeof(*ctx->const_block));
2018 ctx->shift_lsbs = av_malloc_array(num_buffers, sizeof(*ctx->shift_lsbs));
2019 ctx->opt_order = av_malloc_array(num_buffers, sizeof(*ctx->opt_order));
2020 ctx->store_prev_samples = av_malloc_array(num_buffers, sizeof(*ctx->store_prev_samples));
2021 ctx->use_ltp = av_mallocz_array(num_buffers, sizeof(*ctx->use_ltp));
2022 ctx->ltp_lag = av_malloc_array(num_buffers, sizeof(*ctx->ltp_lag));
2023 ctx->ltp_gain = av_malloc_array(num_buffers, sizeof(*ctx->ltp_gain));
2024 ctx->ltp_gain_buffer = av_malloc_array(num_buffers * 5, sizeof(*ctx->ltp_gain_buffer));
2026 if (!ctx->const_block || !ctx->shift_lsbs ||
2027 !ctx->opt_order || !ctx->store_prev_samples ||
2028 !ctx->use_ltp || !ctx->ltp_lag ||
2029 !ctx->ltp_gain || !ctx->ltp_gain_buffer) {
2030 av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
2031 ret = AVERROR(ENOMEM);
2035 for (c = 0; c < num_buffers; c++)
2036 ctx->ltp_gain[c] = ctx->ltp_gain_buffer + c * 5;
2038 // allocate and assign channel data buffer for mcc mode
2039 if (sconf->mc_coding) {
2040 ctx->chan_data_buffer = av_mallocz_array(num_buffers * num_buffers,
2041 sizeof(*ctx->chan_data_buffer));
2042 ctx->chan_data = av_mallocz_array(num_buffers,
2043 sizeof(*ctx->chan_data));
2044 ctx->reverted_channels = av_malloc_array(num_buffers,
2045 sizeof(*ctx->reverted_channels));
2047 if (!ctx->chan_data_buffer || !ctx->chan_data || !ctx->reverted_channels) {
2048 av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
2049 ret = AVERROR(ENOMEM);
2053 for (c = 0; c < num_buffers; c++)
2054 ctx->chan_data[c] = ctx->chan_data_buffer + c * num_buffers;
2056 ctx->chan_data = NULL;
2057 ctx->chan_data_buffer = NULL;
2058 ctx->reverted_channels = NULL;
2061 channel_size = sconf->frame_length + sconf->max_order;
2063 ctx->prev_raw_samples = av_malloc_array(sconf->max_order, sizeof(*ctx->prev_raw_samples));
2064 ctx->raw_buffer = av_mallocz_array(avctx->channels * channel_size, sizeof(*ctx->raw_buffer));
2065 ctx->raw_samples = av_malloc_array(avctx->channels, sizeof(*ctx->raw_samples));
2067 if (sconf->floating) {
2068 ctx->acf = av_malloc_array(avctx->channels, sizeof(*ctx->acf));
2069 ctx->shift_value = av_malloc_array(avctx->channels, sizeof(*ctx->shift_value));
2070 ctx->last_shift_value = av_malloc_array(avctx->channels, sizeof(*ctx->last_shift_value));
2071 ctx->last_acf_mantissa = av_malloc_array(avctx->channels, sizeof(*ctx->last_acf_mantissa));
2072 ctx->raw_mantissa = av_mallocz_array(avctx->channels, sizeof(*ctx->raw_mantissa));
2074 ctx->larray = av_malloc_array(ctx->cur_frame_length * 4, sizeof(*ctx->larray));
2075 ctx->nbits = av_malloc_array(ctx->cur_frame_length, sizeof(*ctx->nbits));
2076 ctx->mlz = av_mallocz(sizeof(*ctx->mlz));
2078 if (!ctx->mlz || !ctx->acf || !ctx->shift_value || !ctx->last_shift_value
2079 || !ctx->last_acf_mantissa || !ctx->raw_mantissa) {
2080 av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
2081 ret = AVERROR(ENOMEM);
2085 ff_mlz_init_dict(avctx, ctx->mlz);
2086 ff_mlz_flush_dict(ctx->mlz);
2088 for (c = 0; c < avctx->channels; ++c) {
2089 ctx->raw_mantissa[c] = av_mallocz_array(ctx->cur_frame_length, sizeof(**ctx->raw_mantissa));
2093 // allocate previous raw sample buffer
2094 if (!ctx->prev_raw_samples || !ctx->raw_buffer|| !ctx->raw_samples) {
2095 av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
2096 ret = AVERROR(ENOMEM);
2100 // assign raw samples buffers
2101 ctx->raw_samples[0] = ctx->raw_buffer + sconf->max_order;
2102 for (c = 1; c < avctx->channels; c++)
2103 ctx->raw_samples[c] = ctx->raw_samples[c - 1] + channel_size;
2105 // allocate crc buffer
2106 if (HAVE_BIGENDIAN != sconf->msb_first && sconf->crc_enabled &&
2107 (avctx->err_recognition & (AV_EF_CRCCHECK|AV_EF_CAREFUL))) {
2108 ctx->crc_buffer = av_malloc_array(ctx->cur_frame_length *
2110 av_get_bytes_per_sample(avctx->sample_fmt),
2111 sizeof(*ctx->crc_buffer));
2112 if (!ctx->crc_buffer) {
2113 av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
2114 ret = AVERROR(ENOMEM);
2119 ff_bswapdsp_init(&ctx->bdsp);
2129 /** Flush (reset) the frame ID after seeking.
2131 static av_cold void flush(AVCodecContext *avctx)
2133 ALSDecContext *ctx = avctx->priv_data;
2139 AVCodec ff_als_decoder = {
2141 .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 Audio Lossless Coding (ALS)"),
2142 .type = AVMEDIA_TYPE_AUDIO,
2143 .id = AV_CODEC_ID_MP4ALS,
2144 .priv_data_size = sizeof(ALSDecContext),
2145 .init = decode_init,
2146 .close = decode_end,
2147 .decode = decode_frame,
2149 .capabilities = AV_CODEC_CAP_SUBFRAMES | AV_CODEC_CAP_DR1,