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 unsigned 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 unsigned 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 opt_order = *bd->opt_order;
712 if (sconf->coef_table == 3) {
715 // read coefficient 0
716 quant_cof[0] = 32 * parcor_scaled_values[get_bits(gb, 7)];
718 // read coefficient 1
720 quant_cof[1] = -32 * parcor_scaled_values[get_bits(gb, 7)];
722 // read coefficients 2 to opt_order
723 for (k = 2; k < opt_order; k++)
724 quant_cof[k] = get_bits(gb, 7);
729 // read coefficient 0 to 19
730 k_max = FFMIN(opt_order, 20);
731 for (k = 0; k < k_max; k++) {
732 int rice_param = parcor_rice_table[sconf->coef_table][k][1];
733 int offset = parcor_rice_table[sconf->coef_table][k][0];
734 quant_cof[k] = decode_rice(gb, rice_param) + offset;
735 if (quant_cof[k] < -64 || quant_cof[k] > 63) {
736 av_log(avctx, AV_LOG_ERROR,
737 "quant_cof %"PRId32" is out of range.\n",
739 return AVERROR_INVALIDDATA;
743 // read coefficients 20 to 126
744 k_max = FFMIN(opt_order, 127);
745 for (; k < k_max; k++)
746 quant_cof[k] = decode_rice(gb, 2) + (k & 1);
748 // read coefficients 127 to opt_order
749 for (; k < opt_order; k++)
750 quant_cof[k] = decode_rice(gb, 1);
752 quant_cof[0] = 32 * parcor_scaled_values[quant_cof[0] + 64];
755 quant_cof[1] = -32 * parcor_scaled_values[quant_cof[1] + 64];
758 for (k = 2; k < opt_order; k++)
759 quant_cof[k] = (quant_cof[k] * (1 << 14)) + (add_base << 13);
763 // read LTP gain and lag values
764 if (sconf->long_term_prediction) {
765 *bd->use_ltp = get_bits1(gb);
770 bd->ltp_gain[0] = decode_rice(gb, 1) * 8;
771 bd->ltp_gain[1] = decode_rice(gb, 2) * 8;
773 r = get_unary(gb, 0, 4);
776 av_log(avctx, AV_LOG_ERROR, "r overflow\n");
777 return AVERROR_INVALIDDATA;
780 bd->ltp_gain[2] = ltp_gain_values[r][c];
782 bd->ltp_gain[3] = decode_rice(gb, 2) * 8;
783 bd->ltp_gain[4] = decode_rice(gb, 1) * 8;
785 *bd->ltp_lag = get_bits(gb, ctx->ltp_lag_length);
786 *bd->ltp_lag += FFMAX(4, opt_order + 1);
790 // read first value and residuals in case of a random access block
792 start = FFMIN(opt_order, 3);
793 av_assert0(sb_length <= sconf->frame_length);
794 if (sb_length <= start) {
795 // opt_order or sb_length may be corrupted, either way this is unsupported and not well defined in the specification
796 av_log(avctx, AV_LOG_ERROR, "Sub block length smaller or equal start\n");
797 return AVERROR_PATCHWELCOME;
801 bd->raw_samples[0] = decode_rice(gb, avctx->bits_per_raw_sample - 4);
803 bd->raw_samples[1] = decode_rice(gb, FFMIN(s[0] + 3, ctx->s_max));
805 bd->raw_samples[2] = decode_rice(gb, FFMIN(s[0] + 1, ctx->s_max));
808 // read all residuals
812 unsigned int b = av_clip((av_ceil_log2(bd->block_length) - 3) >> 1, 0, 5);
814 // read most significant bits
819 ff_bgmc_decode_init(gb, &high, &low, &value);
821 current_res = bd->raw_samples + start;
823 for (sb = 0; sb < sub_blocks; sb++) {
824 unsigned int sb_len = sb_length - (sb ? 0 : start);
826 k [sb] = s[sb] > b ? s[sb] - b : 0;
827 delta[sb] = 5 - s[sb] + k[sb];
829 ff_bgmc_decode(gb, sb_len, current_res,
830 delta[sb], sx[sb], &high, &low, &value, ctx->bgmc_lut, ctx->bgmc_lut_status);
832 current_res += sb_len;
835 ff_bgmc_decode_end(gb);
838 // read least significant bits and tails
839 current_res = bd->raw_samples + start;
841 for (sb = 0; sb < sub_blocks; sb++, start = 0) {
842 unsigned int cur_tail_code = tail_code[sx[sb]][delta[sb]];
843 unsigned int cur_k = k[sb];
844 unsigned int cur_s = s[sb];
846 for (; start < sb_length; start++) {
847 int32_t res = *current_res;
849 if (res == cur_tail_code) {
850 unsigned int max_msb = (2 + (sx[sb] > 2) + (sx[sb] > 10))
853 res = decode_rice(gb, cur_s);
856 res += (max_msb ) << cur_k;
858 res -= (max_msb - 1) << cur_k;
861 if (res > cur_tail_code)
871 res |= get_bits_long(gb, cur_k);
875 *current_res++ = res;
879 current_res = bd->raw_samples + start;
881 for (sb = 0; sb < sub_blocks; sb++, start = 0)
882 for (; start < sb_length; start++)
883 *current_res++ = decode_rice(gb, s[sb]);
890 /** Decode the block data for a non-constant block
892 static int decode_var_block_data(ALSDecContext *ctx, ALSBlockData *bd)
894 ALSSpecificConfig *sconf = &ctx->sconf;
895 unsigned int block_length = bd->block_length;
896 unsigned int smp = 0;
898 int opt_order = *bd->opt_order;
901 int32_t *quant_cof = bd->quant_cof;
902 int32_t *lpc_cof = bd->lpc_cof;
903 int32_t *raw_samples = bd->raw_samples;
904 int32_t *raw_samples_end = bd->raw_samples + bd->block_length;
905 int32_t *lpc_cof_reversed = ctx->lpc_cof_reversed_buffer;
907 // reverse long-term prediction
911 for (ltp_smp = FFMAX(*bd->ltp_lag - 2, 0); ltp_smp < block_length; ltp_smp++) {
912 int center = ltp_smp - *bd->ltp_lag;
913 int begin = FFMAX(0, center - 2);
914 int end = center + 3;
915 int tab = 5 - (end - begin);
920 for (base = begin; base < end; base++, tab++)
921 y += MUL64(bd->ltp_gain[tab], raw_samples[base]);
923 raw_samples[ltp_smp] += y >> 7;
927 // reconstruct all samples from residuals
929 for (smp = 0; smp < FFMIN(opt_order, block_length); smp++) {
932 for (sb = 0; sb < smp; sb++)
933 y += MUL64(lpc_cof[sb], raw_samples[-(sb + 1)]);
935 *raw_samples++ -= y >> 20;
936 parcor_to_lpc(smp, quant_cof, lpc_cof);
939 for (k = 0; k < opt_order; k++)
940 parcor_to_lpc(k, quant_cof, lpc_cof);
942 // store previous samples in case that they have to be altered
943 if (*bd->store_prev_samples)
944 memcpy(bd->prev_raw_samples, raw_samples - sconf->max_order,
945 sizeof(*bd->prev_raw_samples) * sconf->max_order);
947 // reconstruct difference signal for prediction (joint-stereo)
948 if (bd->js_blocks && bd->raw_other) {
949 int32_t *left, *right;
951 if (bd->raw_other > raw_samples) { // D = R - L
953 right = bd->raw_other;
954 } else { // D = R - L
955 left = bd->raw_other;
959 for (sb = -1; sb >= -sconf->max_order; sb--)
960 raw_samples[sb] = right[sb] - left[sb];
963 // reconstruct shifted signal
965 for (sb = -1; sb >= -sconf->max_order; sb--)
966 raw_samples[sb] >>= *bd->shift_lsbs;
969 // reverse linear prediction coefficients for efficiency
970 lpc_cof = lpc_cof + opt_order;
972 for (sb = 0; sb < opt_order; sb++)
973 lpc_cof_reversed[sb] = lpc_cof[-(sb + 1)];
975 // reconstruct raw samples
976 raw_samples = bd->raw_samples + smp;
977 lpc_cof = lpc_cof_reversed + opt_order;
979 for (; raw_samples < raw_samples_end; raw_samples++) {
982 for (sb = -opt_order; sb < 0; sb++)
983 y += (uint64_t)MUL64(lpc_cof[sb], raw_samples[sb]);
985 *raw_samples -= y >> 20;
988 raw_samples = bd->raw_samples;
990 // restore previous samples in case that they have been altered
991 if (*bd->store_prev_samples)
992 memcpy(raw_samples - sconf->max_order, bd->prev_raw_samples,
993 sizeof(*raw_samples) * sconf->max_order);
999 /** Read the block data.
1001 static int read_block(ALSDecContext *ctx, ALSBlockData *bd)
1004 GetBitContext *gb = &ctx->gb;
1005 ALSSpecificConfig *sconf = &ctx->sconf;
1007 *bd->shift_lsbs = 0;
1008 // read block type flag and read the samples accordingly
1009 if (get_bits1(gb)) {
1010 ret = read_var_block_data(ctx, bd);
1012 ret = read_const_block_data(ctx, bd);
1015 if (!sconf->mc_coding || ctx->js_switch)
1022 /** Decode the block data.
1024 static int decode_block(ALSDecContext *ctx, ALSBlockData *bd)
1029 // read block type flag and read the samples accordingly
1030 if (*bd->const_block)
1031 decode_const_block_data(ctx, bd);
1033 ret = decode_var_block_data(ctx, bd); // always return 0
1038 // TODO: read RLSLMS extension data
1040 if (*bd->shift_lsbs)
1041 for (smp = 0; smp < bd->block_length; smp++)
1042 bd->raw_samples[smp] = (unsigned)bd->raw_samples[smp] << *bd->shift_lsbs;
1048 /** Read and decode block data successively.
1050 static int read_decode_block(ALSDecContext *ctx, ALSBlockData *bd)
1054 if ((ret = read_block(ctx, bd)) < 0)
1057 return decode_block(ctx, bd);
1061 /** Compute the number of samples left to decode for the current frame and
1062 * sets these samples to zero.
1064 static void zero_remaining(unsigned int b, unsigned int b_max,
1065 const unsigned int *div_blocks, int32_t *buf)
1067 unsigned int count = 0;
1070 count += div_blocks[b++];
1073 memset(buf, 0, sizeof(*buf) * count);
1077 /** Decode blocks independently.
1079 static int decode_blocks_ind(ALSDecContext *ctx, unsigned int ra_frame,
1080 unsigned int c, const unsigned int *div_blocks,
1081 unsigned int *js_blocks)
1085 ALSBlockData bd = { 0 };
1087 bd.ra_block = ra_frame;
1088 bd.const_block = ctx->const_block;
1089 bd.shift_lsbs = ctx->shift_lsbs;
1090 bd.opt_order = ctx->opt_order;
1091 bd.store_prev_samples = ctx->store_prev_samples;
1092 bd.use_ltp = ctx->use_ltp;
1093 bd.ltp_lag = ctx->ltp_lag;
1094 bd.ltp_gain = ctx->ltp_gain[0];
1095 bd.quant_cof = ctx->quant_cof[0];
1096 bd.lpc_cof = ctx->lpc_cof[0];
1097 bd.prev_raw_samples = ctx->prev_raw_samples;
1098 bd.raw_samples = ctx->raw_samples[c];
1101 for (b = 0; b < ctx->num_blocks; b++) {
1102 bd.block_length = div_blocks[b];
1104 if ((ret = read_decode_block(ctx, &bd)) < 0) {
1105 // damaged block, write zero for the rest of the frame
1106 zero_remaining(b, ctx->num_blocks, div_blocks, bd.raw_samples);
1109 bd.raw_samples += div_blocks[b];
1117 /** Decode blocks dependently.
1119 static int decode_blocks(ALSDecContext *ctx, unsigned int ra_frame,
1120 unsigned int c, const unsigned int *div_blocks,
1121 unsigned int *js_blocks)
1123 ALSSpecificConfig *sconf = &ctx->sconf;
1124 unsigned int offset = 0;
1127 ALSBlockData bd[2] = { { 0 } };
1129 bd[0].ra_block = ra_frame;
1130 bd[0].const_block = ctx->const_block;
1131 bd[0].shift_lsbs = ctx->shift_lsbs;
1132 bd[0].opt_order = ctx->opt_order;
1133 bd[0].store_prev_samples = ctx->store_prev_samples;
1134 bd[0].use_ltp = ctx->use_ltp;
1135 bd[0].ltp_lag = ctx->ltp_lag;
1136 bd[0].ltp_gain = ctx->ltp_gain[0];
1137 bd[0].quant_cof = ctx->quant_cof[0];
1138 bd[0].lpc_cof = ctx->lpc_cof[0];
1139 bd[0].prev_raw_samples = ctx->prev_raw_samples;
1140 bd[0].js_blocks = *js_blocks;
1142 bd[1].ra_block = ra_frame;
1143 bd[1].const_block = ctx->const_block;
1144 bd[1].shift_lsbs = ctx->shift_lsbs;
1145 bd[1].opt_order = ctx->opt_order;
1146 bd[1].store_prev_samples = ctx->store_prev_samples;
1147 bd[1].use_ltp = ctx->use_ltp;
1148 bd[1].ltp_lag = ctx->ltp_lag;
1149 bd[1].ltp_gain = ctx->ltp_gain[0];
1150 bd[1].quant_cof = ctx->quant_cof[0];
1151 bd[1].lpc_cof = ctx->lpc_cof[0];
1152 bd[1].prev_raw_samples = ctx->prev_raw_samples;
1153 bd[1].js_blocks = *(js_blocks + 1);
1155 // decode all blocks
1156 for (b = 0; b < ctx->num_blocks; b++) {
1159 bd[0].block_length = div_blocks[b];
1160 bd[1].block_length = div_blocks[b];
1162 bd[0].raw_samples = ctx->raw_samples[c ] + offset;
1163 bd[1].raw_samples = ctx->raw_samples[c + 1] + offset;
1165 bd[0].raw_other = bd[1].raw_samples;
1166 bd[1].raw_other = bd[0].raw_samples;
1168 if ((ret = read_decode_block(ctx, &bd[0])) < 0 ||
1169 (ret = read_decode_block(ctx, &bd[1])) < 0)
1172 // reconstruct joint-stereo blocks
1173 if (bd[0].js_blocks) {
1174 if (bd[1].js_blocks)
1175 av_log(ctx->avctx, AV_LOG_WARNING, "Invalid channel pair.\n");
1177 for (s = 0; s < div_blocks[b]; s++)
1178 bd[0].raw_samples[s] = bd[1].raw_samples[s] - bd[0].raw_samples[s];
1179 } else if (bd[1].js_blocks) {
1180 for (s = 0; s < div_blocks[b]; s++)
1181 bd[1].raw_samples[s] = bd[1].raw_samples[s] + bd[0].raw_samples[s];
1184 offset += div_blocks[b];
1189 // store carryover raw samples,
1190 // the others channel raw samples are stored by the calling function.
1191 memmove(ctx->raw_samples[c] - sconf->max_order,
1192 ctx->raw_samples[c] - sconf->max_order + sconf->frame_length,
1193 sizeof(*ctx->raw_samples[c]) * sconf->max_order);
1197 // damaged block, write zero for the rest of the frame
1198 zero_remaining(b, ctx->num_blocks, div_blocks, bd[0].raw_samples);
1199 zero_remaining(b, ctx->num_blocks, div_blocks, bd[1].raw_samples);
1203 static inline int als_weighting(GetBitContext *gb, int k, int off)
1205 int idx = av_clip(decode_rice(gb, k) + off,
1206 0, FF_ARRAY_ELEMS(mcc_weightings) - 1);
1207 return mcc_weightings[idx];
1210 /** Read the channel data.
1212 static int read_channel_data(ALSDecContext *ctx, ALSChannelData *cd, int c)
1214 GetBitContext *gb = &ctx->gb;
1215 ALSChannelData *current = cd;
1216 unsigned int channels = ctx->avctx->channels;
1219 while (entries < channels && !(current->stop_flag = get_bits1(gb))) {
1220 current->master_channel = get_bits_long(gb, av_ceil_log2(channels));
1222 if (current->master_channel >= channels) {
1223 av_log(ctx->avctx, AV_LOG_ERROR, "Invalid master channel.\n");
1224 return AVERROR_INVALIDDATA;
1227 if (current->master_channel != c) {
1228 current->time_diff_flag = get_bits1(gb);
1229 current->weighting[0] = als_weighting(gb, 1, 16);
1230 current->weighting[1] = als_weighting(gb, 2, 14);
1231 current->weighting[2] = als_weighting(gb, 1, 16);
1233 if (current->time_diff_flag) {
1234 current->weighting[3] = als_weighting(gb, 1, 16);
1235 current->weighting[4] = als_weighting(gb, 1, 16);
1236 current->weighting[5] = als_weighting(gb, 1, 16);
1238 current->time_diff_sign = get_bits1(gb);
1239 current->time_diff_index = get_bits(gb, ctx->ltp_lag_length - 3) + 3;
1247 if (entries == channels) {
1248 av_log(ctx->avctx, AV_LOG_ERROR, "Damaged channel data.\n");
1249 return AVERROR_INVALIDDATA;
1257 /** Recursively reverts the inter-channel correlation for a block.
1259 static int revert_channel_correlation(ALSDecContext *ctx, ALSBlockData *bd,
1260 ALSChannelData **cd, int *reverted,
1261 unsigned int offset, int c)
1263 ALSChannelData *ch = cd[c];
1264 unsigned int dep = 0;
1265 unsigned int channels = ctx->avctx->channels;
1266 unsigned int channel_size = ctx->sconf.frame_length + ctx->sconf.max_order;
1273 while (dep < channels && !ch[dep].stop_flag) {
1274 revert_channel_correlation(ctx, bd, cd, reverted, offset,
1275 ch[dep].master_channel);
1280 if (dep == channels) {
1281 av_log(ctx->avctx, AV_LOG_WARNING, "Invalid channel correlation.\n");
1282 return AVERROR_INVALIDDATA;
1285 bd->const_block = ctx->const_block + c;
1286 bd->shift_lsbs = ctx->shift_lsbs + c;
1287 bd->opt_order = ctx->opt_order + c;
1288 bd->store_prev_samples = ctx->store_prev_samples + c;
1289 bd->use_ltp = ctx->use_ltp + c;
1290 bd->ltp_lag = ctx->ltp_lag + c;
1291 bd->ltp_gain = ctx->ltp_gain[c];
1292 bd->lpc_cof = ctx->lpc_cof[c];
1293 bd->quant_cof = ctx->quant_cof[c];
1294 bd->raw_samples = ctx->raw_samples[c] + offset;
1296 for (dep = 0; !ch[dep].stop_flag; dep++) {
1298 ptrdiff_t begin = 1;
1299 ptrdiff_t end = bd->block_length - 1;
1301 int32_t *master = ctx->raw_samples[ch[dep].master_channel] + offset;
1303 if (ch[dep].master_channel == c)
1306 if (ch[dep].time_diff_flag) {
1307 int t = ch[dep].time_diff_index;
1309 if (ch[dep].time_diff_sign) {
1312 av_log(ctx->avctx, AV_LOG_ERROR, "begin %"PTRDIFF_SPECIFIER" smaller than time diff index %d.\n", begin, t);
1313 return AVERROR_INVALIDDATA;
1318 av_log(ctx->avctx, AV_LOG_ERROR, "end %"PTRDIFF_SPECIFIER" smaller than time diff index %d.\n", end, t);
1319 return AVERROR_INVALIDDATA;
1324 if (FFMIN(begin - 1, begin - 1 + t) < ctx->raw_buffer - master ||
1325 FFMAX(end + 1, end + 1 + t) > ctx->raw_buffer + channels * channel_size - master) {
1326 av_log(ctx->avctx, AV_LOG_ERROR,
1327 "sample pointer range [%p, %p] not contained in raw_buffer [%p, %p].\n",
1328 master + FFMIN(begin - 1, begin - 1 + t), master + FFMAX(end + 1, end + 1 + t),
1329 ctx->raw_buffer, ctx->raw_buffer + channels * channel_size);
1330 return AVERROR_INVALIDDATA;
1333 for (smp = begin; smp < end; smp++) {
1335 MUL64(ch[dep].weighting[0], master[smp - 1 ]) +
1336 MUL64(ch[dep].weighting[1], master[smp ]) +
1337 MUL64(ch[dep].weighting[2], master[smp + 1 ]) +
1338 MUL64(ch[dep].weighting[3], master[smp - 1 + t]) +
1339 MUL64(ch[dep].weighting[4], master[smp + t]) +
1340 MUL64(ch[dep].weighting[5], master[smp + 1 + t]);
1342 bd->raw_samples[smp] += y >> 7;
1346 if (begin - 1 < ctx->raw_buffer - master ||
1347 end + 1 > ctx->raw_buffer + channels * channel_size - master) {
1348 av_log(ctx->avctx, AV_LOG_ERROR,
1349 "sample pointer range [%p, %p] not contained in raw_buffer [%p, %p].\n",
1350 master + begin - 1, master + end + 1,
1351 ctx->raw_buffer, ctx->raw_buffer + channels * channel_size);
1352 return AVERROR_INVALIDDATA;
1355 for (smp = begin; smp < end; smp++) {
1357 MUL64(ch[dep].weighting[0], master[smp - 1]) +
1358 MUL64(ch[dep].weighting[1], master[smp ]) +
1359 MUL64(ch[dep].weighting[2], master[smp + 1]);
1361 bd->raw_samples[smp] += y >> 7;
1370 /** multiply two softfloats and handle the rounding off
1372 static SoftFloat_IEEE754 multiply(SoftFloat_IEEE754 a, SoftFloat_IEEE754 b) {
1373 uint64_t mantissa_temp;
1375 int cutoff_bit_count;
1376 unsigned char last_2_bits;
1377 unsigned int mantissa;
1379 uint32_t return_val = 0;
1382 sign = a.sign ^ b.sign;
1384 // Multiply mantissa bits in a 64-bit register
1385 mantissa_temp = (uint64_t)a.mant * (uint64_t)b.mant;
1386 mask_64 = (uint64_t)0x1 << 47;
1391 // Count the valid bit count
1392 while (!(mantissa_temp & mask_64) && mask_64) {
1398 cutoff_bit_count = bit_count - 24;
1399 if (cutoff_bit_count > 0) {
1400 last_2_bits = (unsigned char)(((unsigned int)mantissa_temp >> (cutoff_bit_count - 1)) & 0x3 );
1401 if ((last_2_bits == 0x3) || ((last_2_bits == 0x1) && ((unsigned int)mantissa_temp & ((0x1UL << (cutoff_bit_count - 1)) - 1)))) {
1403 mantissa_temp += (uint64_t)0x1 << cutoff_bit_count;
1407 mantissa = (unsigned int)(mantissa_temp >> cutoff_bit_count);
1409 // Need one more shift?
1410 if (mantissa & 0x01000000ul) {
1416 return_val = 0x80000000U;
1419 return_val |= (a.exp + b.exp + bit_count - 47) << 23;
1420 return_val |= mantissa;
1421 return av_bits2sf_ieee754(return_val);
1425 /** Read and decode the floating point sample data
1427 static int read_diff_float_data(ALSDecContext *ctx, unsigned int ra_frame) {
1428 AVCodecContext *avctx = ctx->avctx;
1429 GetBitContext *gb = &ctx->gb;
1430 SoftFloat_IEEE754 *acf = ctx->acf;
1431 int *shift_value = ctx->shift_value;
1432 int *last_shift_value = ctx->last_shift_value;
1433 int *last_acf_mantissa = ctx->last_acf_mantissa;
1434 int **raw_mantissa = ctx->raw_mantissa;
1435 int *nbits = ctx->nbits;
1436 unsigned char *larray = ctx->larray;
1437 int frame_length = ctx->cur_frame_length;
1438 SoftFloat_IEEE754 scale = av_int2sf_ieee754(0x1u, 23);
1439 unsigned int partA_flag;
1440 unsigned int highest_byte;
1441 unsigned int shift_amp;
1455 skip_bits_long(gb, 32); //num_bytes_diff_float
1456 use_acf = get_bits1(gb);
1459 memset(last_acf_mantissa, 0, avctx->channels * sizeof(*last_acf_mantissa));
1460 memset(last_shift_value, 0, avctx->channels * sizeof(*last_shift_value) );
1461 ff_mlz_flush_dict(ctx->mlz);
1464 for (c = 0; c < avctx->channels; ++c) {
1467 if (get_bits1(gb)) {
1468 tmp_32 = get_bits(gb, 23);
1469 last_acf_mantissa[c] = tmp_32;
1471 tmp_32 = last_acf_mantissa[c];
1473 acf[c] = av_bits2sf_ieee754(tmp_32);
1478 highest_byte = get_bits(gb, 2);
1479 partA_flag = get_bits1(gb);
1480 shift_amp = get_bits1(gb);
1483 shift_value[c] = get_bits(gb, 8);
1484 last_shift_value[c] = shift_value[c];
1486 shift_value[c] = last_shift_value[c];
1490 if (!get_bits1(gb)) { //uncompressed
1491 for (i = 0; i < frame_length; ++i) {
1492 if (ctx->raw_samples[c][i] == 0) {
1493 ctx->raw_mantissa[c][i] = get_bits_long(gb, 32);
1496 } else { //compressed
1498 for (i = 0; i < frame_length; ++i) {
1499 if (ctx->raw_samples[c][i] == 0) {
1504 tmp_32 = ff_mlz_decompression(ctx->mlz, gb, nchars, larray);
1505 if(tmp_32 != nchars) {
1506 av_log(ctx->avctx, AV_LOG_ERROR, "Error in MLZ decompression (%"PRId32", %d).\n", tmp_32, nchars);
1507 return AVERROR_INVALIDDATA;
1510 for (i = 0; i < frame_length; ++i) {
1511 ctx->raw_mantissa[c][i] = AV_RB32(larray);
1518 for (i = 0; i < frame_length; ++i) {
1519 if (ctx->raw_samples[c][i] != 0) {
1520 //The following logic is taken from Tabel 14.45 and 14.46 from the ISO spec
1521 if (av_cmp_sf_ieee754(acf[c], FLOAT_1)) {
1522 nbits[i] = 23 - av_log2(abs(ctx->raw_samples[c][i]));
1526 nbits[i] = FFMIN(nbits[i], highest_byte*8);
1530 if (!get_bits1(gb)) { //uncompressed
1531 for (i = 0; i < frame_length; ++i) {
1532 if (ctx->raw_samples[c][i] != 0) {
1533 raw_mantissa[c][i] = get_bitsz(gb, nbits[i]);
1536 } else { //compressed
1538 for (i = 0; i < frame_length; ++i) {
1539 if (ctx->raw_samples[c][i]) {
1540 nchars += (int) nbits[i] / 8;
1547 tmp_32 = ff_mlz_decompression(ctx->mlz, gb, nchars, larray);
1548 if(tmp_32 != nchars) {
1549 av_log(ctx->avctx, AV_LOG_ERROR, "Error in MLZ decompression (%"PRId32", %d).\n", tmp_32, nchars);
1550 return AVERROR_INVALIDDATA;
1554 for (i = 0; i < frame_length; ++i) {
1555 if (ctx->raw_samples[c][i]) {
1557 nbits_aligned = 8 * ((unsigned int)(nbits[i] / 8) + 1);
1559 nbits_aligned = nbits[i];
1562 for (k = 0; k < nbits_aligned/8; ++k) {
1563 acc = (acc << 8) + larray[j++];
1565 acc >>= (nbits_aligned - nbits[i]);
1566 raw_mantissa[c][i] = acc;
1572 for (i = 0; i < frame_length; ++i) {
1573 SoftFloat_IEEE754 pcm_sf = av_int2sf_ieee754(ctx->raw_samples[c][i], 0);
1574 pcm_sf = av_div_sf_ieee754(pcm_sf, scale);
1576 if (ctx->raw_samples[c][i] != 0) {
1577 if (!av_cmp_sf_ieee754(acf[c], FLOAT_1)) {
1578 pcm_sf = multiply(acf[c], pcm_sf);
1583 mantissa = (pcm_sf.mant | 0x800000) + raw_mantissa[c][i];
1585 while(mantissa >= 0x1000000) {
1590 if (mantissa) e += (shift_value[c] - 127);
1591 mantissa &= 0x007fffffUL;
1593 tmp_32 = (sign << 31) | ((e + EXP_BIAS) << 23) | (mantissa);
1594 ctx->raw_samples[c][i] = tmp_32;
1596 ctx->raw_samples[c][i] = raw_mantissa[c][i] & 0x007fffffUL;
1605 /** Read the frame data.
1607 static int read_frame_data(ALSDecContext *ctx, unsigned int ra_frame)
1609 ALSSpecificConfig *sconf = &ctx->sconf;
1610 AVCodecContext *avctx = ctx->avctx;
1611 GetBitContext *gb = &ctx->gb;
1612 unsigned int div_blocks[32]; ///< block sizes.
1614 unsigned int js_blocks[2];
1615 uint32_t bs_info = 0;
1618 // skip the size of the ra unit if present in the frame
1619 if (sconf->ra_flag == RA_FLAG_FRAMES && ra_frame)
1620 skip_bits_long(gb, 32);
1622 if (sconf->mc_coding && sconf->joint_stereo) {
1623 ctx->js_switch = get_bits1(gb);
1627 if (!sconf->mc_coding || ctx->js_switch) {
1628 int independent_bs = !sconf->joint_stereo;
1630 for (c = 0; c < avctx->channels; c++) {
1634 get_block_sizes(ctx, div_blocks, &bs_info);
1636 // if joint_stereo and block_switching is set, independent decoding
1637 // is signaled via the first bit of bs_info
1638 if (sconf->joint_stereo && sconf->block_switching)
1642 // if this is the last channel, it has to be decoded independently
1643 if (c == avctx->channels - 1 || (c & 1))
1646 if (independent_bs) {
1647 ret = decode_blocks_ind(ctx, ra_frame, c,
1648 div_blocks, js_blocks);
1653 ret = decode_blocks(ctx, ra_frame, c, div_blocks, js_blocks);
1660 // store carryover raw samples
1661 memmove(ctx->raw_samples[c] - sconf->max_order,
1662 ctx->raw_samples[c] - sconf->max_order + sconf->frame_length,
1663 sizeof(*ctx->raw_samples[c]) * sconf->max_order);
1665 } else { // multi-channel coding
1666 ALSBlockData bd = { 0 };
1668 int *reverted_channels = ctx->reverted_channels;
1669 unsigned int offset = 0;
1671 for (c = 0; c < avctx->channels; c++)
1672 if (ctx->chan_data[c] < ctx->chan_data_buffer) {
1673 av_log(ctx->avctx, AV_LOG_ERROR, "Invalid channel data.\n");
1674 return AVERROR_INVALIDDATA;
1677 memset(reverted_channels, 0, sizeof(*reverted_channels) * avctx->channels);
1679 bd.ra_block = ra_frame;
1680 bd.prev_raw_samples = ctx->prev_raw_samples;
1682 get_block_sizes(ctx, div_blocks, &bs_info);
1684 for (b = 0; b < ctx->num_blocks; b++) {
1685 bd.block_length = div_blocks[b];
1686 if (bd.block_length <= 0) {
1687 av_log(ctx->avctx, AV_LOG_WARNING,
1688 "Invalid block length %u in channel data!\n",
1693 for (c = 0; c < avctx->channels; c++) {
1694 bd.const_block = ctx->const_block + c;
1695 bd.shift_lsbs = ctx->shift_lsbs + c;
1696 bd.opt_order = ctx->opt_order + c;
1697 bd.store_prev_samples = ctx->store_prev_samples + c;
1698 bd.use_ltp = ctx->use_ltp + c;
1699 bd.ltp_lag = ctx->ltp_lag + c;
1700 bd.ltp_gain = ctx->ltp_gain[c];
1701 bd.lpc_cof = ctx->lpc_cof[c];
1702 bd.quant_cof = ctx->quant_cof[c];
1703 bd.raw_samples = ctx->raw_samples[c] + offset;
1704 bd.raw_other = NULL;
1706 if ((ret = read_block(ctx, &bd)) < 0)
1708 if ((ret = read_channel_data(ctx, ctx->chan_data[c], c)) < 0)
1712 for (c = 0; c < avctx->channels; c++) {
1713 ret = revert_channel_correlation(ctx, &bd, ctx->chan_data,
1714 reverted_channels, offset, c);
1718 for (c = 0; c < avctx->channels; c++) {
1719 bd.const_block = ctx->const_block + c;
1720 bd.shift_lsbs = ctx->shift_lsbs + c;
1721 bd.opt_order = ctx->opt_order + c;
1722 bd.store_prev_samples = ctx->store_prev_samples + c;
1723 bd.use_ltp = ctx->use_ltp + c;
1724 bd.ltp_lag = ctx->ltp_lag + c;
1725 bd.ltp_gain = ctx->ltp_gain[c];
1726 bd.lpc_cof = ctx->lpc_cof[c];
1727 bd.quant_cof = ctx->quant_cof[c];
1728 bd.raw_samples = ctx->raw_samples[c] + offset;
1730 if ((ret = decode_block(ctx, &bd)) < 0)
1734 memset(reverted_channels, 0, avctx->channels * sizeof(*reverted_channels));
1735 offset += div_blocks[b];
1739 // store carryover raw samples
1740 for (c = 0; c < avctx->channels; c++)
1741 memmove(ctx->raw_samples[c] - sconf->max_order,
1742 ctx->raw_samples[c] - sconf->max_order + sconf->frame_length,
1743 sizeof(*ctx->raw_samples[c]) * sconf->max_order);
1746 if (sconf->floating) {
1747 read_diff_float_data(ctx, ra_frame);
1750 if (get_bits_left(gb) < 0) {
1751 av_log(ctx->avctx, AV_LOG_ERROR, "Overread %d\n", -get_bits_left(gb));
1752 return AVERROR_INVALIDDATA;
1759 /** Decode an ALS frame.
1761 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame_ptr,
1764 ALSDecContext *ctx = avctx->priv_data;
1765 AVFrame *frame = data;
1766 ALSSpecificConfig *sconf = &ctx->sconf;
1767 const uint8_t *buffer = avpkt->data;
1768 int buffer_size = avpkt->size;
1769 int invalid_frame, ret;
1770 unsigned int c, sample, ra_frame, bytes_read, shift;
1772 if ((ret = init_get_bits8(&ctx->gb, buffer, buffer_size)) < 0)
1775 // In the case that the distance between random access frames is set to zero
1776 // (sconf->ra_distance == 0) no frame is treated as a random access frame.
1777 // For the first frame, if prediction is used, all samples used from the
1778 // previous frame are assumed to be zero.
1779 ra_frame = sconf->ra_distance && !(ctx->frame_id % sconf->ra_distance);
1781 // the last frame to decode might have a different length
1782 if (sconf->samples != 0xFFFFFFFF)
1783 ctx->cur_frame_length = FFMIN(sconf->samples - ctx->frame_id * (uint64_t) sconf->frame_length,
1784 sconf->frame_length);
1786 ctx->cur_frame_length = sconf->frame_length;
1788 // decode the frame data
1789 if ((invalid_frame = read_frame_data(ctx, ra_frame)) < 0)
1790 av_log(ctx->avctx, AV_LOG_WARNING,
1791 "Reading frame data failed. Skipping RA unit.\n");
1795 /* get output buffer */
1796 frame->nb_samples = ctx->cur_frame_length;
1797 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
1800 // transform decoded frame into output format
1801 #define INTERLEAVE_OUTPUT(bps) \
1803 int##bps##_t *dest = (int##bps##_t*)frame->data[0]; \
1804 shift = bps - ctx->avctx->bits_per_raw_sample; \
1805 if (!ctx->cs_switch) { \
1806 for (sample = 0; sample < ctx->cur_frame_length; sample++) \
1807 for (c = 0; c < avctx->channels; c++) \
1808 *dest++ = ctx->raw_samples[c][sample] * (1U << shift); \
1810 for (sample = 0; sample < ctx->cur_frame_length; sample++) \
1811 for (c = 0; c < avctx->channels; c++) \
1812 *dest++ = ctx->raw_samples[sconf->chan_pos[c]][sample] * (1U << shift); \
1816 if (ctx->avctx->bits_per_raw_sample <= 16) {
1817 INTERLEAVE_OUTPUT(16)
1819 INTERLEAVE_OUTPUT(32)
1823 if (sconf->crc_enabled && (avctx->err_recognition & (AV_EF_CRCCHECK|AV_EF_CAREFUL))) {
1824 int swap = HAVE_BIGENDIAN != sconf->msb_first;
1826 if (ctx->avctx->bits_per_raw_sample == 24) {
1827 int32_t *src = (int32_t *)frame->data[0];
1830 sample < ctx->cur_frame_length * avctx->channels;
1835 v = av_bswap32(src[sample]);
1838 if (!HAVE_BIGENDIAN)
1841 ctx->crc = av_crc(ctx->crc_table, ctx->crc, (uint8_t*)(&v), 3);
1844 uint8_t *crc_source;
1847 if (ctx->avctx->bits_per_raw_sample <= 16) {
1848 int16_t *src = (int16_t*) frame->data[0];
1849 int16_t *dest = (int16_t*) ctx->crc_buffer;
1851 sample < ctx->cur_frame_length * avctx->channels;
1853 *dest++ = av_bswap16(src[sample]);
1855 ctx->bdsp.bswap_buf((uint32_t *) ctx->crc_buffer,
1856 (uint32_t *) frame->data[0],
1857 ctx->cur_frame_length * avctx->channels);
1859 crc_source = ctx->crc_buffer;
1861 crc_source = frame->data[0];
1864 ctx->crc = av_crc(ctx->crc_table, ctx->crc, crc_source,
1865 ctx->cur_frame_length * avctx->channels *
1866 av_get_bytes_per_sample(avctx->sample_fmt));
1870 // check CRC sums if this is the last frame
1871 if (ctx->cur_frame_length != sconf->frame_length &&
1872 ctx->crc_org != ctx->crc) {
1873 av_log(avctx, AV_LOG_ERROR, "CRC error.\n");
1874 if (avctx->err_recognition & AV_EF_EXPLODE)
1875 return AVERROR_INVALIDDATA;
1881 bytes_read = invalid_frame ? buffer_size :
1882 (get_bits_count(&ctx->gb) + 7) >> 3;
1888 /** Uninitialize the ALS decoder.
1890 static av_cold int decode_end(AVCodecContext *avctx)
1892 ALSDecContext *ctx = avctx->priv_data;
1895 av_freep(&ctx->sconf.chan_pos);
1897 ff_bgmc_end(&ctx->bgmc_lut, &ctx->bgmc_lut_status);
1899 av_freep(&ctx->const_block);
1900 av_freep(&ctx->shift_lsbs);
1901 av_freep(&ctx->opt_order);
1902 av_freep(&ctx->store_prev_samples);
1903 av_freep(&ctx->use_ltp);
1904 av_freep(&ctx->ltp_lag);
1905 av_freep(&ctx->ltp_gain);
1906 av_freep(&ctx->ltp_gain_buffer);
1907 av_freep(&ctx->quant_cof);
1908 av_freep(&ctx->lpc_cof);
1909 av_freep(&ctx->quant_cof_buffer);
1910 av_freep(&ctx->lpc_cof_buffer);
1911 av_freep(&ctx->lpc_cof_reversed_buffer);
1912 av_freep(&ctx->prev_raw_samples);
1913 av_freep(&ctx->raw_samples);
1914 av_freep(&ctx->raw_buffer);
1915 av_freep(&ctx->chan_data);
1916 av_freep(&ctx->chan_data_buffer);
1917 av_freep(&ctx->reverted_channels);
1918 av_freep(&ctx->crc_buffer);
1920 av_freep(&ctx->mlz->dict);
1921 av_freep(&ctx->mlz);
1923 av_freep(&ctx->acf);
1924 av_freep(&ctx->last_acf_mantissa);
1925 av_freep(&ctx->shift_value);
1926 av_freep(&ctx->last_shift_value);
1927 if (ctx->raw_mantissa) {
1928 for (i = 0; i < avctx->channels; i++) {
1929 av_freep(&ctx->raw_mantissa[i]);
1931 av_freep(&ctx->raw_mantissa);
1933 av_freep(&ctx->larray);
1934 av_freep(&ctx->nbits);
1940 /** Initialize the ALS decoder.
1942 static av_cold int decode_init(AVCodecContext *avctx)
1945 unsigned int channel_size;
1946 int num_buffers, ret;
1947 ALSDecContext *ctx = avctx->priv_data;
1948 ALSSpecificConfig *sconf = &ctx->sconf;
1951 if (!avctx->extradata) {
1952 av_log(avctx, AV_LOG_ERROR, "Missing required ALS extradata.\n");
1953 return AVERROR_INVALIDDATA;
1956 if ((ret = read_specific_config(ctx)) < 0) {
1957 av_log(avctx, AV_LOG_ERROR, "Reading ALSSpecificConfig failed.\n");
1961 if ((ret = check_specific_config(ctx)) < 0) {
1966 ret = ff_bgmc_init(avctx, &ctx->bgmc_lut, &ctx->bgmc_lut_status);
1970 if (sconf->floating) {
1971 avctx->sample_fmt = AV_SAMPLE_FMT_FLT;
1972 avctx->bits_per_raw_sample = 32;
1974 avctx->sample_fmt = sconf->resolution > 1
1975 ? AV_SAMPLE_FMT_S32 : AV_SAMPLE_FMT_S16;
1976 avctx->bits_per_raw_sample = (sconf->resolution + 1) * 8;
1977 if (avctx->bits_per_raw_sample > 32) {
1978 av_log(avctx, AV_LOG_ERROR, "Bits per raw sample %d larger than 32.\n",
1979 avctx->bits_per_raw_sample);
1980 ret = AVERROR_INVALIDDATA;
1985 // set maximum Rice parameter for progressive decoding based on resolution
1986 // This is not specified in 14496-3 but actually done by the reference
1987 // codec RM22 revision 2.
1988 ctx->s_max = sconf->resolution > 1 ? 31 : 15;
1990 // set lag value for long-term prediction
1991 ctx->ltp_lag_length = 8 + (avctx->sample_rate >= 96000) +
1992 (avctx->sample_rate >= 192000);
1994 // allocate quantized parcor coefficient buffer
1995 num_buffers = sconf->mc_coding ? avctx->channels : 1;
1996 if (num_buffers * (uint64_t)num_buffers > INT_MAX) // protect chan_data_buffer allocation
1997 return AVERROR_INVALIDDATA;
1999 ctx->quant_cof = av_malloc_array(num_buffers, sizeof(*ctx->quant_cof));
2000 ctx->lpc_cof = av_malloc_array(num_buffers, sizeof(*ctx->lpc_cof));
2001 ctx->quant_cof_buffer = av_malloc_array(num_buffers * sconf->max_order,
2002 sizeof(*ctx->quant_cof_buffer));
2003 ctx->lpc_cof_buffer = av_malloc_array(num_buffers * sconf->max_order,
2004 sizeof(*ctx->lpc_cof_buffer));
2005 ctx->lpc_cof_reversed_buffer = av_malloc_array(sconf->max_order,
2006 sizeof(*ctx->lpc_cof_buffer));
2008 if (!ctx->quant_cof || !ctx->lpc_cof ||
2009 !ctx->quant_cof_buffer || !ctx->lpc_cof_buffer ||
2010 !ctx->lpc_cof_reversed_buffer) {
2011 av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
2012 ret = AVERROR(ENOMEM);
2016 // assign quantized parcor coefficient buffers
2017 for (c = 0; c < num_buffers; c++) {
2018 ctx->quant_cof[c] = ctx->quant_cof_buffer + c * sconf->max_order;
2019 ctx->lpc_cof[c] = ctx->lpc_cof_buffer + c * sconf->max_order;
2022 // allocate and assign lag and gain data buffer for ltp mode
2023 ctx->const_block = av_malloc_array(num_buffers, sizeof(*ctx->const_block));
2024 ctx->shift_lsbs = av_malloc_array(num_buffers, sizeof(*ctx->shift_lsbs));
2025 ctx->opt_order = av_malloc_array(num_buffers, sizeof(*ctx->opt_order));
2026 ctx->store_prev_samples = av_malloc_array(num_buffers, sizeof(*ctx->store_prev_samples));
2027 ctx->use_ltp = av_mallocz_array(num_buffers, sizeof(*ctx->use_ltp));
2028 ctx->ltp_lag = av_malloc_array(num_buffers, sizeof(*ctx->ltp_lag));
2029 ctx->ltp_gain = av_malloc_array(num_buffers, sizeof(*ctx->ltp_gain));
2030 ctx->ltp_gain_buffer = av_malloc_array(num_buffers * 5, sizeof(*ctx->ltp_gain_buffer));
2032 if (!ctx->const_block || !ctx->shift_lsbs ||
2033 !ctx->opt_order || !ctx->store_prev_samples ||
2034 !ctx->use_ltp || !ctx->ltp_lag ||
2035 !ctx->ltp_gain || !ctx->ltp_gain_buffer) {
2036 av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
2037 ret = AVERROR(ENOMEM);
2041 for (c = 0; c < num_buffers; c++)
2042 ctx->ltp_gain[c] = ctx->ltp_gain_buffer + c * 5;
2044 // allocate and assign channel data buffer for mcc mode
2045 if (sconf->mc_coding) {
2046 ctx->chan_data_buffer = av_mallocz_array(num_buffers * num_buffers,
2047 sizeof(*ctx->chan_data_buffer));
2048 ctx->chan_data = av_mallocz_array(num_buffers,
2049 sizeof(*ctx->chan_data));
2050 ctx->reverted_channels = av_malloc_array(num_buffers,
2051 sizeof(*ctx->reverted_channels));
2053 if (!ctx->chan_data_buffer || !ctx->chan_data || !ctx->reverted_channels) {
2054 av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
2055 ret = AVERROR(ENOMEM);
2059 for (c = 0; c < num_buffers; c++)
2060 ctx->chan_data[c] = ctx->chan_data_buffer + c * num_buffers;
2062 ctx->chan_data = NULL;
2063 ctx->chan_data_buffer = NULL;
2064 ctx->reverted_channels = NULL;
2067 channel_size = sconf->frame_length + sconf->max_order;
2069 ctx->prev_raw_samples = av_malloc_array(sconf->max_order, sizeof(*ctx->prev_raw_samples));
2070 ctx->raw_buffer = av_mallocz_array(avctx->channels * channel_size, sizeof(*ctx->raw_buffer));
2071 ctx->raw_samples = av_malloc_array(avctx->channels, sizeof(*ctx->raw_samples));
2073 if (sconf->floating) {
2074 ctx->acf = av_malloc_array(avctx->channels, sizeof(*ctx->acf));
2075 ctx->shift_value = av_malloc_array(avctx->channels, sizeof(*ctx->shift_value));
2076 ctx->last_shift_value = av_malloc_array(avctx->channels, sizeof(*ctx->last_shift_value));
2077 ctx->last_acf_mantissa = av_malloc_array(avctx->channels, sizeof(*ctx->last_acf_mantissa));
2078 ctx->raw_mantissa = av_mallocz_array(avctx->channels, sizeof(*ctx->raw_mantissa));
2080 ctx->larray = av_malloc_array(ctx->cur_frame_length * 4, sizeof(*ctx->larray));
2081 ctx->nbits = av_malloc_array(ctx->cur_frame_length, sizeof(*ctx->nbits));
2082 ctx->mlz = av_mallocz(sizeof(*ctx->mlz));
2084 if (!ctx->mlz || !ctx->acf || !ctx->shift_value || !ctx->last_shift_value
2085 || !ctx->last_acf_mantissa || !ctx->raw_mantissa) {
2086 av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
2087 ret = AVERROR(ENOMEM);
2091 ff_mlz_init_dict(avctx, ctx->mlz);
2092 ff_mlz_flush_dict(ctx->mlz);
2094 for (c = 0; c < avctx->channels; ++c) {
2095 ctx->raw_mantissa[c] = av_mallocz_array(ctx->cur_frame_length, sizeof(**ctx->raw_mantissa));
2099 // allocate previous raw sample buffer
2100 if (!ctx->prev_raw_samples || !ctx->raw_buffer|| !ctx->raw_samples) {
2101 av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
2102 ret = AVERROR(ENOMEM);
2106 // assign raw samples buffers
2107 ctx->raw_samples[0] = ctx->raw_buffer + sconf->max_order;
2108 for (c = 1; c < avctx->channels; c++)
2109 ctx->raw_samples[c] = ctx->raw_samples[c - 1] + channel_size;
2111 // allocate crc buffer
2112 if (HAVE_BIGENDIAN != sconf->msb_first && sconf->crc_enabled &&
2113 (avctx->err_recognition & (AV_EF_CRCCHECK|AV_EF_CAREFUL))) {
2114 ctx->crc_buffer = av_malloc_array(ctx->cur_frame_length *
2116 av_get_bytes_per_sample(avctx->sample_fmt),
2117 sizeof(*ctx->crc_buffer));
2118 if (!ctx->crc_buffer) {
2119 av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
2120 ret = AVERROR(ENOMEM);
2125 ff_bswapdsp_init(&ctx->bdsp);
2134 /** Flush (reset) the frame ID after seeking.
2136 static av_cold void flush(AVCodecContext *avctx)
2138 ALSDecContext *ctx = avctx->priv_data;
2144 AVCodec ff_als_decoder = {
2146 .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 Audio Lossless Coding (ALS)"),
2147 .type = AVMEDIA_TYPE_AUDIO,
2148 .id = AV_CODEC_ID_MP4ALS,
2149 .priv_data_size = sizeof(ALSDecContext),
2150 .init = decode_init,
2151 .close = decode_end,
2152 .decode = decode_frame,
2154 .capabilities = AV_CODEC_CAP_SUBFRAMES | AV_CODEC_CAP_DR1,
2155 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,