3 * Copyright (c) 2009 Thilo Borgmann <thilo.borgmann _at_ googlemail.com>
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
25 * @author Thilo Borgmann <thilo.borgmann _at_ googlemail.com>
35 #include "mpeg4audio.h"
36 #include "bytestream.h"
39 #include "libavcore/samplefmt.h"
40 #include "libavutil/crc.h"
44 /** Rice parameters and corresponding index offsets for decoding the
45 * indices of scaled PARCOR values. The table chosen is set globally
46 * by the encoder and stored in ALSSpecificConfig.
48 static const int8_t parcor_rice_table[3][20][2] = {
49 { {-52, 4}, {-29, 5}, {-31, 4}, { 19, 4}, {-16, 4},
50 { 12, 3}, { -7, 3}, { 9, 3}, { -5, 3}, { 6, 3},
51 { -4, 3}, { 3, 3}, { -3, 2}, { 3, 2}, { -2, 2},
52 { 3, 2}, { -1, 2}, { 2, 2}, { -1, 2}, { 2, 2} },
53 { {-58, 3}, {-42, 4}, {-46, 4}, { 37, 5}, {-36, 4},
54 { 29, 4}, {-29, 4}, { 25, 4}, {-23, 4}, { 20, 4},
55 {-17, 4}, { 16, 4}, {-12, 4}, { 12, 3}, {-10, 4},
56 { 7, 3}, { -4, 4}, { 3, 3}, { -1, 3}, { 1, 3} },
57 { {-59, 3}, {-45, 5}, {-50, 4}, { 38, 4}, {-39, 4},
58 { 32, 4}, {-30, 4}, { 25, 3}, {-23, 3}, { 20, 3},
59 {-20, 3}, { 16, 3}, {-13, 3}, { 10, 3}, { -7, 3},
60 { 3, 3}, { 0, 3}, { -1, 3}, { 2, 3}, { -1, 2} }
64 /** Scaled PARCOR values used for the first two PARCOR coefficients.
65 * To be indexed by the Rice coded indices.
66 * Generated by: parcor_scaled_values[i] = 32 + ((i * (i+1)) << 7) - (1 << 20)
67 * Actual values are divided by 32 in order to be stored in 16 bits.
69 static const int16_t parcor_scaled_values[] = {
70 -1048544 / 32, -1048288 / 32, -1047776 / 32, -1047008 / 32,
71 -1045984 / 32, -1044704 / 32, -1043168 / 32, -1041376 / 32,
72 -1039328 / 32, -1037024 / 32, -1034464 / 32, -1031648 / 32,
73 -1028576 / 32, -1025248 / 32, -1021664 / 32, -1017824 / 32,
74 -1013728 / 32, -1009376 / 32, -1004768 / 32, -999904 / 32,
75 -994784 / 32, -989408 / 32, -983776 / 32, -977888 / 32,
76 -971744 / 32, -965344 / 32, -958688 / 32, -951776 / 32,
77 -944608 / 32, -937184 / 32, -929504 / 32, -921568 / 32,
78 -913376 / 32, -904928 / 32, -896224 / 32, -887264 / 32,
79 -878048 / 32, -868576 / 32, -858848 / 32, -848864 / 32,
80 -838624 / 32, -828128 / 32, -817376 / 32, -806368 / 32,
81 -795104 / 32, -783584 / 32, -771808 / 32, -759776 / 32,
82 -747488 / 32, -734944 / 32, -722144 / 32, -709088 / 32,
83 -695776 / 32, -682208 / 32, -668384 / 32, -654304 / 32,
84 -639968 / 32, -625376 / 32, -610528 / 32, -595424 / 32,
85 -580064 / 32, -564448 / 32, -548576 / 32, -532448 / 32,
86 -516064 / 32, -499424 / 32, -482528 / 32, -465376 / 32,
87 -447968 / 32, -430304 / 32, -412384 / 32, -394208 / 32,
88 -375776 / 32, -357088 / 32, -338144 / 32, -318944 / 32,
89 -299488 / 32, -279776 / 32, -259808 / 32, -239584 / 32,
90 -219104 / 32, -198368 / 32, -177376 / 32, -156128 / 32,
91 -134624 / 32, -112864 / 32, -90848 / 32, -68576 / 32,
92 -46048 / 32, -23264 / 32, -224 / 32, 23072 / 32,
93 46624 / 32, 70432 / 32, 94496 / 32, 118816 / 32,
94 143392 / 32, 168224 / 32, 193312 / 32, 218656 / 32,
95 244256 / 32, 270112 / 32, 296224 / 32, 322592 / 32,
96 349216 / 32, 376096 / 32, 403232 / 32, 430624 / 32,
97 458272 / 32, 486176 / 32, 514336 / 32, 542752 / 32,
98 571424 / 32, 600352 / 32, 629536 / 32, 658976 / 32,
99 688672 / 32, 718624 / 32, 748832 / 32, 779296 / 32,
100 810016 / 32, 840992 / 32, 872224 / 32, 903712 / 32,
101 935456 / 32, 967456 / 32, 999712 / 32, 1032224 / 32
105 /** Gain values of p(0) for long-term prediction.
106 * To be indexed by the Rice coded indices.
108 static const uint8_t ltp_gain_values [4][4] = {
116 /** Inter-channel weighting factors for multi-channel correlation.
117 * To be indexed by the Rice coded indices.
119 static const int16_t mcc_weightings[] = {
120 204, 192, 179, 166, 153, 140, 128, 115,
121 102, 89, 76, 64, 51, 38, 25, 12,
122 0, -12, -25, -38, -51, -64, -76, -89,
123 -102, -115, -128, -140, -153, -166, -179, -192
127 /** Tail codes used in arithmetic coding using block Gilbert-Moore codes.
129 static const uint8_t tail_code[16][6] = {
130 { 74, 44, 25, 13, 7, 3},
131 { 68, 42, 24, 13, 7, 3},
132 { 58, 39, 23, 13, 7, 3},
133 {126, 70, 37, 19, 10, 5},
134 {132, 70, 37, 20, 10, 5},
135 {124, 70, 38, 20, 10, 5},
136 {120, 69, 37, 20, 11, 5},
137 {116, 67, 37, 20, 11, 5},
138 {108, 66, 36, 20, 10, 5},
139 {102, 62, 36, 20, 10, 5},
140 { 88, 58, 34, 19, 10, 5},
141 {162, 89, 49, 25, 13, 7},
142 {156, 87, 49, 26, 14, 7},
143 {150, 86, 47, 26, 14, 7},
144 {142, 84, 47, 26, 14, 7},
145 {131, 79, 46, 26, 14, 7}
157 uint32_t samples; ///< number of samples, 0xFFFFFFFF if unknown
158 int resolution; ///< 000 = 8-bit; 001 = 16-bit; 010 = 24-bit; 011 = 32-bit
159 int floating; ///< 1 = IEEE 32-bit floating-point, 0 = integer
160 int msb_first; ///< 1 = original CRC calculated on big-endian system, 0 = little-endian
161 int frame_length; ///< frame length for each frame (last frame may differ)
162 int ra_distance; ///< distance between RA frames (in frames, 0...255)
163 enum RA_Flag ra_flag; ///< indicates where the size of ra units is stored
164 int adapt_order; ///< adaptive order: 1 = on, 0 = off
165 int coef_table; ///< table index of Rice code parameters
166 int long_term_prediction; ///< long term prediction (LTP): 1 = on, 0 = off
167 int max_order; ///< maximum prediction order (0..1023)
168 int block_switching; ///< number of block switching levels
169 int bgmc; ///< "Block Gilbert-Moore Code": 1 = on, 0 = off (Rice coding only)
170 int sb_part; ///< sub-block partition
171 int joint_stereo; ///< joint stereo: 1 = on, 0 = off
172 int mc_coding; ///< extended inter-channel coding (multi channel coding): 1 = on, 0 = off
173 int chan_config; ///< indicates that a chan_config_info field is present
174 int chan_sort; ///< channel rearrangement: 1 = on, 0 = off
175 int rlslms; ///< use "Recursive Least Square-Least Mean Square" predictor: 1 = on, 0 = off
176 int chan_config_info; ///< mapping of channels to loudspeaker locations. Unused until setting channel configuration is implemented.
177 int *chan_pos; ///< original channel positions
178 int crc_enabled; ///< enable Cyclic Redundancy Checksum
193 AVCodecContext *avctx;
194 ALSSpecificConfig sconf;
197 const AVCRC *crc_table;
198 uint32_t crc_org; ///< CRC value of the original input data
199 uint32_t crc; ///< CRC value calculated from decoded data
200 unsigned int cur_frame_length; ///< length of the current frame to decode
201 unsigned int frame_id; ///< the frame ID / number of the current frame
202 unsigned int js_switch; ///< if true, joint-stereo decoding is enforced
203 unsigned int num_blocks; ///< number of blocks used in the current frame
204 unsigned int s_max; ///< maximum Rice parameter allowed in entropy coding
205 uint8_t *bgmc_lut; ///< pointer at lookup tables used for BGMC
206 int *bgmc_lut_status; ///< pointer at lookup table status flags used for BGMC
207 int ltp_lag_length; ///< number of bits used for ltp lag value
208 int *use_ltp; ///< contains use_ltp flags for all channels
209 int *ltp_lag; ///< contains ltp lag values for all channels
210 int **ltp_gain; ///< gain values for ltp 5-tap filter for a channel
211 int *ltp_gain_buffer; ///< contains all gain values for ltp 5-tap filter
212 int32_t **quant_cof; ///< quantized parcor coefficients for a channel
213 int32_t *quant_cof_buffer; ///< contains all quantized parcor coefficients
214 int32_t **lpc_cof; ///< coefficients of the direct form prediction filter for a channel
215 int32_t *lpc_cof_buffer; ///< contains all coefficients of the direct form prediction filter
216 int32_t *lpc_cof_reversed_buffer; ///< temporary buffer to set up a reversed versio of lpc_cof_buffer
217 ALSChannelData **chan_data; ///< channel data for multi-channel correlation
218 ALSChannelData *chan_data_buffer; ///< contains channel data for all channels
219 int *reverted_channels; ///< stores a flag for each reverted channel
220 int32_t *prev_raw_samples; ///< contains unshifted raw samples from the previous block
221 int32_t **raw_samples; ///< decoded raw samples for each channel
222 int32_t *raw_buffer; ///< contains all decoded raw samples including carryover samples
223 uint8_t *crc_buffer; ///< buffer of byte order corrected samples used for CRC check
228 unsigned int block_length; ///< number of samples within the block
229 unsigned int ra_block; ///< if true, this is a random access block
230 int const_block; ///< if true, this is a constant value block
231 int32_t const_val; ///< the sample value of a constant block
232 int js_blocks; ///< true if this block contains a difference signal
233 unsigned int shift_lsbs; ///< shift of values for this block
234 unsigned int opt_order; ///< prediction order of this block
235 int store_prev_samples;///< if true, carryover samples have to be stored
236 int *use_ltp; ///< if true, long-term prediction is used
237 int *ltp_lag; ///< lag value for long-term prediction
238 int *ltp_gain; ///< gain values for ltp 5-tap filter
239 int32_t *quant_cof; ///< quantized parcor coefficients
240 int32_t *lpc_cof; ///< coefficients of the direct form prediction
241 int32_t *raw_samples; ///< decoded raw samples / residuals for this block
242 int32_t *prev_raw_samples; ///< contains unshifted raw samples from the previous block
243 int32_t *raw_other; ///< decoded raw samples of the other channel of a channel pair
247 static av_cold void dprint_specific_config(ALSDecContext *ctx)
250 AVCodecContext *avctx = ctx->avctx;
251 ALSSpecificConfig *sconf = &ctx->sconf;
253 dprintf(avctx, "resolution = %i\n", sconf->resolution);
254 dprintf(avctx, "floating = %i\n", sconf->floating);
255 dprintf(avctx, "frame_length = %i\n", sconf->frame_length);
256 dprintf(avctx, "ra_distance = %i\n", sconf->ra_distance);
257 dprintf(avctx, "ra_flag = %i\n", sconf->ra_flag);
258 dprintf(avctx, "adapt_order = %i\n", sconf->adapt_order);
259 dprintf(avctx, "coef_table = %i\n", sconf->coef_table);
260 dprintf(avctx, "long_term_prediction = %i\n", sconf->long_term_prediction);
261 dprintf(avctx, "max_order = %i\n", sconf->max_order);
262 dprintf(avctx, "block_switching = %i\n", sconf->block_switching);
263 dprintf(avctx, "bgmc = %i\n", sconf->bgmc);
264 dprintf(avctx, "sb_part = %i\n", sconf->sb_part);
265 dprintf(avctx, "joint_stereo = %i\n", sconf->joint_stereo);
266 dprintf(avctx, "mc_coding = %i\n", sconf->mc_coding);
267 dprintf(avctx, "chan_config = %i\n", sconf->chan_config);
268 dprintf(avctx, "chan_sort = %i\n", sconf->chan_sort);
269 dprintf(avctx, "RLSLMS = %i\n", sconf->rlslms);
270 dprintf(avctx, "chan_config_info = %i\n", sconf->chan_config_info);
275 /** Read an ALSSpecificConfig from a buffer into the output struct.
277 static av_cold int read_specific_config(ALSDecContext *ctx)
281 int i, config_offset;
282 MPEG4AudioConfig m4ac;
283 ALSSpecificConfig *sconf = &ctx->sconf;
284 AVCodecContext *avctx = ctx->avctx;
285 uint32_t als_id, header_size, trailer_size;
287 init_get_bits(&gb, avctx->extradata, avctx->extradata_size * 8);
289 config_offset = ff_mpeg4audio_get_config(&m4ac, avctx->extradata,
290 avctx->extradata_size);
292 if (config_offset < 0)
295 skip_bits_long(&gb, config_offset);
297 if (get_bits_left(&gb) < (30 << 3))
300 // read the fixed items
301 als_id = get_bits_long(&gb, 32);
302 avctx->sample_rate = m4ac.sample_rate;
303 skip_bits_long(&gb, 32); // sample rate already known
304 sconf->samples = get_bits_long(&gb, 32);
305 avctx->channels = m4ac.channels;
306 skip_bits(&gb, 16); // number of channels already knwon
307 skip_bits(&gb, 3); // skip file_type
308 sconf->resolution = get_bits(&gb, 3);
309 sconf->floating = get_bits1(&gb);
310 sconf->msb_first = get_bits1(&gb);
311 sconf->frame_length = get_bits(&gb, 16) + 1;
312 sconf->ra_distance = get_bits(&gb, 8);
313 sconf->ra_flag = get_bits(&gb, 2);
314 sconf->adapt_order = get_bits1(&gb);
315 sconf->coef_table = get_bits(&gb, 2);
316 sconf->long_term_prediction = get_bits1(&gb);
317 sconf->max_order = get_bits(&gb, 10);
318 sconf->block_switching = get_bits(&gb, 2);
319 sconf->bgmc = get_bits1(&gb);
320 sconf->sb_part = get_bits1(&gb);
321 sconf->joint_stereo = get_bits1(&gb);
322 sconf->mc_coding = get_bits1(&gb);
323 sconf->chan_config = get_bits1(&gb);
324 sconf->chan_sort = get_bits1(&gb);
325 sconf->crc_enabled = get_bits1(&gb);
326 sconf->rlslms = get_bits1(&gb);
327 skip_bits(&gb, 5); // skip 5 reserved bits
328 skip_bits1(&gb); // skip aux_data_enabled
331 // check for ALSSpecificConfig struct
332 if (als_id != MKBETAG('A','L','S','\0'))
335 ctx->cur_frame_length = sconf->frame_length;
337 // read channel config
338 if (sconf->chan_config)
339 sconf->chan_config_info = get_bits(&gb, 16);
340 // TODO: use this to set avctx->channel_layout
343 // read channel sorting
344 if (sconf->chan_sort && avctx->channels > 1) {
345 int chan_pos_bits = av_ceil_log2(avctx->channels);
346 int bits_needed = avctx->channels * chan_pos_bits + 7;
347 if (get_bits_left(&gb) < bits_needed)
350 if (!(sconf->chan_pos = av_malloc(avctx->channels * sizeof(*sconf->chan_pos))))
351 return AVERROR(ENOMEM);
353 for (i = 0; i < avctx->channels; i++)
354 sconf->chan_pos[i] = get_bits(&gb, chan_pos_bits);
357 // TODO: use this to actually do channel sorting
359 sconf->chan_sort = 0;
363 // read fixed header and trailer sizes,
364 // if size = 0xFFFFFFFF then there is no data field!
365 if (get_bits_left(&gb) < 64)
368 header_size = get_bits_long(&gb, 32);
369 trailer_size = get_bits_long(&gb, 32);
370 if (header_size == 0xFFFFFFFF)
372 if (trailer_size == 0xFFFFFFFF)
375 ht_size = ((int64_t)(header_size) + (int64_t)(trailer_size)) << 3;
378 // skip the header and trailer data
379 if (get_bits_left(&gb) < ht_size)
382 if (ht_size > INT32_MAX)
385 skip_bits_long(&gb, ht_size);
388 // initialize CRC calculation
389 if (sconf->crc_enabled) {
390 if (get_bits_left(&gb) < 32)
393 if (avctx->error_recognition >= FF_ER_CAREFUL) {
394 ctx->crc_table = av_crc_get_table(AV_CRC_32_IEEE_LE);
395 ctx->crc = 0xFFFFFFFF;
396 ctx->crc_org = ~get_bits_long(&gb, 32);
398 skip_bits_long(&gb, 32);
402 // no need to read the rest of ALSSpecificConfig (ra_unit_size & aux data)
404 dprint_specific_config(ctx);
410 /** Check the ALSSpecificConfig for unsupported features.
412 static int check_specific_config(ALSDecContext *ctx)
414 ALSSpecificConfig *sconf = &ctx->sconf;
417 // report unsupported feature and set error value
418 #define MISSING_ERR(cond, str, errval) \
421 av_log_missing_feature(ctx->avctx, str, 0); \
426 MISSING_ERR(sconf->floating, "Floating point decoding", -1);
427 MISSING_ERR(sconf->rlslms, "Adaptive RLS-LMS prediction", -1);
428 MISSING_ERR(sconf->chan_sort, "Channel sorting", 0);
434 /** Parse the bs_info field to extract the block partitioning used in
435 * block switching mode, refer to ISO/IEC 14496-3, section 11.6.2.
437 static void parse_bs_info(const uint32_t bs_info, unsigned int n,
438 unsigned int div, unsigned int **div_blocks,
439 unsigned int *num_blocks)
441 if (n < 31 && ((bs_info << n) & 0x40000000)) {
442 // if the level is valid and the investigated bit n is set
443 // then recursively check both children at bits (2n+1) and (2n+2)
446 parse_bs_info(bs_info, n + 1, div, div_blocks, num_blocks);
447 parse_bs_info(bs_info, n + 2, div, div_blocks, num_blocks);
449 // else the bit is not set or the last level has been reached
450 // (bit implicitly not set)
458 /** Read and decode a Rice codeword.
460 static int32_t decode_rice(GetBitContext *gb, unsigned int k)
462 int max = get_bits_left(gb) - k;
463 int q = get_unary(gb, 0, max);
464 int r = k ? get_bits1(gb) : !(q & 1);
468 q += get_bits_long(gb, k - 1);
476 /** Convert PARCOR coefficient k to direct filter coefficient.
478 static void parcor_to_lpc(unsigned int k, const int32_t *par, int32_t *cof)
482 for (i = 0, j = k - 1; i < j; i++, j--) {
483 int tmp1 = ((MUL64(par[k], cof[j]) + (1 << 19)) >> 20);
484 cof[j] += ((MUL64(par[k], cof[i]) + (1 << 19)) >> 20);
488 cof[i] += ((MUL64(par[k], cof[j]) + (1 << 19)) >> 20);
494 /** Read block switching field if necessary and set actual block sizes.
495 * Also assure that the block sizes of the last frame correspond to the
496 * actual number of samples.
498 static void get_block_sizes(ALSDecContext *ctx, unsigned int *div_blocks,
501 ALSSpecificConfig *sconf = &ctx->sconf;
502 GetBitContext *gb = &ctx->gb;
503 unsigned int *ptr_div_blocks = div_blocks;
506 if (sconf->block_switching) {
507 unsigned int bs_info_len = 1 << (sconf->block_switching + 2);
508 *bs_info = get_bits_long(gb, bs_info_len);
509 *bs_info <<= (32 - bs_info_len);
513 parse_bs_info(*bs_info, 0, 0, &ptr_div_blocks, &ctx->num_blocks);
515 // The last frame may have an overdetermined block structure given in
516 // the bitstream. In that case the defined block structure would need
517 // more samples than available to be consistent.
518 // The block structure is actually used but the block sizes are adapted
519 // to fit the actual number of available samples.
520 // Example: 5 samples, 2nd level block sizes: 2 2 2 2.
521 // This results in the actual block sizes: 2 2 1 0.
522 // This is not specified in 14496-3 but actually done by the reference
523 // codec RM22 revision 2.
524 // This appears to happen in case of an odd number of samples in the last
525 // frame which is actually not allowed by the block length switching part
527 // The ALS conformance files feature an odd number of samples in the last
530 for (b = 0; b < ctx->num_blocks; b++)
531 div_blocks[b] = ctx->sconf.frame_length >> div_blocks[b];
533 if (ctx->cur_frame_length != ctx->sconf.frame_length) {
534 unsigned int remaining = ctx->cur_frame_length;
536 for (b = 0; b < ctx->num_blocks; b++) {
537 if (remaining <= div_blocks[b]) {
538 div_blocks[b] = remaining;
539 ctx->num_blocks = b + 1;
543 remaining -= div_blocks[b];
549 /** Read the block data for a constant block
551 static void read_const_block_data(ALSDecContext *ctx, ALSBlockData *bd)
553 ALSSpecificConfig *sconf = &ctx->sconf;
554 AVCodecContext *avctx = ctx->avctx;
555 GetBitContext *gb = &ctx->gb;
558 bd->const_block = get_bits1(gb); // 1 = constant value, 0 = zero block (silence)
559 bd->js_blocks = get_bits1(gb);
561 // skip 5 reserved bits
564 if (bd->const_block) {
565 unsigned int const_val_bits = sconf->floating ? 24 : avctx->bits_per_raw_sample;
566 bd->const_val = get_sbits_long(gb, const_val_bits);
569 // ensure constant block decoding by reusing this field
574 /** Decode the block data for a constant block
576 static void decode_const_block_data(ALSDecContext *ctx, ALSBlockData *bd)
578 int smp = bd->block_length;
579 int32_t val = bd->const_val;
580 int32_t *dst = bd->raw_samples;
582 // write raw samples into buffer
588 /** Read the block data for a non-constant block
590 static int read_var_block_data(ALSDecContext *ctx, ALSBlockData *bd)
592 ALSSpecificConfig *sconf = &ctx->sconf;
593 AVCodecContext *avctx = ctx->avctx;
594 GetBitContext *gb = &ctx->gb;
598 unsigned int sub_blocks, log2_sub_blocks, sb_length;
599 unsigned int start = 0;
600 unsigned int opt_order;
602 int32_t *quant_cof = bd->quant_cof;
603 int32_t *current_res;
606 // ensure variable block decoding by reusing this field
610 bd->js_blocks = get_bits1(gb);
612 opt_order = bd->opt_order;
614 // determine the number of subblocks for entropy decoding
615 if (!sconf->bgmc && !sconf->sb_part) {
618 if (sconf->bgmc && sconf->sb_part)
619 log2_sub_blocks = get_bits(gb, 2);
621 log2_sub_blocks = 2 * get_bits1(gb);
624 sub_blocks = 1 << log2_sub_blocks;
626 // do not continue in case of a damaged stream since
627 // block_length must be evenly divisible by sub_blocks
628 if (bd->block_length & (sub_blocks - 1)) {
629 av_log(avctx, AV_LOG_WARNING,
630 "Block length is not evenly divisible by the number of subblocks.\n");
634 sb_length = bd->block_length >> log2_sub_blocks;
637 s[0] = get_bits(gb, 8 + (sconf->resolution > 1));
638 for (k = 1; k < sub_blocks; k++)
639 s[k] = s[k - 1] + decode_rice(gb, 2);
641 for (k = 0; k < sub_blocks; k++) {
646 s[0] = get_bits(gb, 4 + (sconf->resolution > 1));
647 for (k = 1; k < sub_blocks; k++)
648 s[k] = s[k - 1] + decode_rice(gb, 0);
652 bd->shift_lsbs = get_bits(gb, 4) + 1;
654 bd->store_prev_samples = (bd->js_blocks && bd->raw_other) || bd->shift_lsbs;
657 if (!sconf->rlslms) {
658 if (sconf->adapt_order) {
659 int opt_order_length = av_ceil_log2(av_clip((bd->block_length >> 3) - 1,
660 2, sconf->max_order + 1));
661 bd->opt_order = get_bits(gb, opt_order_length);
663 bd->opt_order = sconf->max_order;
666 opt_order = bd->opt_order;
671 if (sconf->coef_table == 3) {
674 // read coefficient 0
675 quant_cof[0] = 32 * parcor_scaled_values[get_bits(gb, 7)];
677 // read coefficient 1
679 quant_cof[1] = -32 * parcor_scaled_values[get_bits(gb, 7)];
681 // read coefficients 2 to opt_order
682 for (k = 2; k < opt_order; k++)
683 quant_cof[k] = get_bits(gb, 7);
688 // read coefficient 0 to 19
689 k_max = FFMIN(opt_order, 20);
690 for (k = 0; k < k_max; k++) {
691 int rice_param = parcor_rice_table[sconf->coef_table][k][1];
692 int offset = parcor_rice_table[sconf->coef_table][k][0];
693 quant_cof[k] = decode_rice(gb, rice_param) + offset;
696 // read coefficients 20 to 126
697 k_max = FFMIN(opt_order, 127);
698 for (; k < k_max; k++)
699 quant_cof[k] = decode_rice(gb, 2) + (k & 1);
701 // read coefficients 127 to opt_order
702 for (; k < opt_order; k++)
703 quant_cof[k] = decode_rice(gb, 1);
705 quant_cof[0] = 32 * parcor_scaled_values[quant_cof[0] + 64];
708 quant_cof[1] = -32 * parcor_scaled_values[quant_cof[1] + 64];
711 for (k = 2; k < opt_order; k++)
712 quant_cof[k] = (quant_cof[k] << 14) + (add_base << 13);
716 // read LTP gain and lag values
717 if (sconf->long_term_prediction) {
718 *bd->use_ltp = get_bits1(gb);
723 bd->ltp_gain[0] = decode_rice(gb, 1) << 3;
724 bd->ltp_gain[1] = decode_rice(gb, 2) << 3;
726 r = get_unary(gb, 0, 4);
728 bd->ltp_gain[2] = ltp_gain_values[r][c];
730 bd->ltp_gain[3] = decode_rice(gb, 2) << 3;
731 bd->ltp_gain[4] = decode_rice(gb, 1) << 3;
733 *bd->ltp_lag = get_bits(gb, ctx->ltp_lag_length);
734 *bd->ltp_lag += FFMAX(4, opt_order + 1);
738 // read first value and residuals in case of a random access block
741 bd->raw_samples[0] = decode_rice(gb, avctx->bits_per_raw_sample - 4);
743 bd->raw_samples[1] = decode_rice(gb, FFMIN(s[0] + 3, ctx->s_max));
745 bd->raw_samples[2] = decode_rice(gb, FFMIN(s[0] + 1, ctx->s_max));
747 start = FFMIN(opt_order, 3);
750 // read all residuals
754 unsigned int b = av_clip((av_ceil_log2(bd->block_length) - 3) >> 1, 0, 5);
755 unsigned int i = start;
757 // read most significant bits
762 ff_bgmc_decode_init(gb, &high, &low, &value);
764 current_res = bd->raw_samples + start;
766 for (sb = 0; sb < sub_blocks; sb++, i = 0) {
767 k [sb] = s[sb] > b ? s[sb] - b : 0;
768 delta[sb] = 5 - s[sb] + k[sb];
770 ff_bgmc_decode(gb, sb_length, current_res,
771 delta[sb], sx[sb], &high, &low, &value, ctx->bgmc_lut, ctx->bgmc_lut_status);
773 current_res += sb_length;
776 ff_bgmc_decode_end(gb);
779 // read least significant bits and tails
781 current_res = bd->raw_samples + start;
783 for (sb = 0; sb < sub_blocks; sb++, i = 0) {
784 unsigned int cur_tail_code = tail_code[sx[sb]][delta[sb]];
785 unsigned int cur_k = k[sb];
786 unsigned int cur_s = s[sb];
788 for (; i < sb_length; i++) {
789 int32_t res = *current_res;
791 if (res == cur_tail_code) {
792 unsigned int max_msb = (2 + (sx[sb] > 2) + (sx[sb] > 10))
795 res = decode_rice(gb, cur_s);
798 res += (max_msb ) << cur_k;
800 res -= (max_msb - 1) << cur_k;
803 if (res > cur_tail_code)
813 res |= get_bits_long(gb, cur_k);
817 *current_res++ = res;
821 current_res = bd->raw_samples + start;
823 for (sb = 0; sb < sub_blocks; sb++, start = 0)
824 for (; start < sb_length; start++)
825 *current_res++ = decode_rice(gb, s[sb]);
828 if (!sconf->mc_coding || ctx->js_switch)
835 /** Decode the block data for a non-constant block
837 static int decode_var_block_data(ALSDecContext *ctx, ALSBlockData *bd)
839 ALSSpecificConfig *sconf = &ctx->sconf;
840 unsigned int block_length = bd->block_length;
841 unsigned int smp = 0;
843 int opt_order = bd->opt_order;
846 int32_t *quant_cof = bd->quant_cof;
847 int32_t *lpc_cof = bd->lpc_cof;
848 int32_t *raw_samples = bd->raw_samples;
849 int32_t *raw_samples_end = bd->raw_samples + bd->block_length;
850 int32_t *lpc_cof_reversed = ctx->lpc_cof_reversed_buffer;
852 // reverse long-term prediction
856 for (ltp_smp = FFMAX(*bd->ltp_lag - 2, 0); ltp_smp < block_length; ltp_smp++) {
857 int center = ltp_smp - *bd->ltp_lag;
858 int begin = FFMAX(0, center - 2);
859 int end = center + 3;
860 int tab = 5 - (end - begin);
865 for (base = begin; base < end; base++, tab++)
866 y += MUL64(bd->ltp_gain[tab], raw_samples[base]);
868 raw_samples[ltp_smp] += y >> 7;
872 // reconstruct all samples from residuals
874 for (smp = 0; smp < opt_order; smp++) {
877 for (sb = 0; sb < smp; sb++)
878 y += MUL64(lpc_cof[sb], raw_samples[-(sb + 1)]);
880 *raw_samples++ -= y >> 20;
881 parcor_to_lpc(smp, quant_cof, lpc_cof);
884 for (k = 0; k < opt_order; k++)
885 parcor_to_lpc(k, quant_cof, lpc_cof);
887 // store previous samples in case that they have to be altered
888 if (bd->store_prev_samples)
889 memcpy(bd->prev_raw_samples, raw_samples - sconf->max_order,
890 sizeof(*bd->prev_raw_samples) * sconf->max_order);
892 // reconstruct difference signal for prediction (joint-stereo)
893 if (bd->js_blocks && bd->raw_other) {
894 int32_t *left, *right;
896 if (bd->raw_other > raw_samples) { // D = R - L
898 right = bd->raw_other;
899 } else { // D = R - L
900 left = bd->raw_other;
904 for (sb = -1; sb >= -sconf->max_order; sb--)
905 raw_samples[sb] = right[sb] - left[sb];
908 // reconstruct shifted signal
910 for (sb = -1; sb >= -sconf->max_order; sb--)
911 raw_samples[sb] >>= bd->shift_lsbs;
914 // reverse linear prediction coefficients for efficiency
915 lpc_cof = lpc_cof + opt_order;
917 for (sb = 0; sb < opt_order; sb++)
918 lpc_cof_reversed[sb] = lpc_cof[-(sb + 1)];
920 // reconstruct raw samples
921 raw_samples = bd->raw_samples + smp;
922 lpc_cof = lpc_cof_reversed + opt_order;
924 for (; raw_samples < raw_samples_end; raw_samples++) {
927 for (sb = -opt_order; sb < 0; sb++)
928 y += MUL64(lpc_cof[sb], raw_samples[sb]);
930 *raw_samples -= y >> 20;
933 raw_samples = bd->raw_samples;
935 // restore previous samples in case that they have been altered
936 if (bd->store_prev_samples)
937 memcpy(raw_samples - sconf->max_order, bd->prev_raw_samples,
938 sizeof(*raw_samples) * sconf->max_order);
944 /** Read the block data.
946 static int read_block(ALSDecContext *ctx, ALSBlockData *bd)
948 GetBitContext *gb = &ctx->gb;
950 // read block type flag and read the samples accordingly
952 if (read_var_block_data(ctx, bd))
955 read_const_block_data(ctx, bd);
962 /** Decode the block data.
964 static int decode_block(ALSDecContext *ctx, ALSBlockData *bd)
968 // read block type flag and read the samples accordingly
970 decode_const_block_data(ctx, bd);
971 else if (decode_var_block_data(ctx, bd))
974 // TODO: read RLSLMS extension data
977 for (smp = 0; smp < bd->block_length; smp++)
978 bd->raw_samples[smp] <<= bd->shift_lsbs;
984 /** Read and decode block data successively.
986 static int read_decode_block(ALSDecContext *ctx, ALSBlockData *bd)
990 ret = read_block(ctx, bd);
995 ret = decode_block(ctx, bd);
1001 /** Compute the number of samples left to decode for the current frame and
1002 * sets these samples to zero.
1004 static void zero_remaining(unsigned int b, unsigned int b_max,
1005 const unsigned int *div_blocks, int32_t *buf)
1007 unsigned int count = 0;
1010 count += div_blocks[b];
1013 memset(buf, 0, sizeof(*buf) * count);
1017 /** Decode blocks independently.
1019 static int decode_blocks_ind(ALSDecContext *ctx, unsigned int ra_frame,
1020 unsigned int c, const unsigned int *div_blocks,
1021 unsigned int *js_blocks)
1026 memset(&bd, 0, sizeof(ALSBlockData));
1028 bd.ra_block = ra_frame;
1029 bd.use_ltp = ctx->use_ltp;
1030 bd.ltp_lag = ctx->ltp_lag;
1031 bd.ltp_gain = ctx->ltp_gain[0];
1032 bd.quant_cof = ctx->quant_cof[0];
1033 bd.lpc_cof = ctx->lpc_cof[0];
1034 bd.prev_raw_samples = ctx->prev_raw_samples;
1035 bd.raw_samples = ctx->raw_samples[c];
1038 for (b = 0; b < ctx->num_blocks; b++) {
1040 bd.block_length = div_blocks[b];
1042 if (read_decode_block(ctx, &bd)) {
1043 // damaged block, write zero for the rest of the frame
1044 zero_remaining(b, ctx->num_blocks, div_blocks, bd.raw_samples);
1047 bd.raw_samples += div_blocks[b];
1055 /** Decode blocks dependently.
1057 static int decode_blocks(ALSDecContext *ctx, unsigned int ra_frame,
1058 unsigned int c, const unsigned int *div_blocks,
1059 unsigned int *js_blocks)
1061 ALSSpecificConfig *sconf = &ctx->sconf;
1062 unsigned int offset = 0;
1066 memset(bd, 0, 2 * sizeof(ALSBlockData));
1068 bd[0].ra_block = ra_frame;
1069 bd[0].use_ltp = ctx->use_ltp;
1070 bd[0].ltp_lag = ctx->ltp_lag;
1071 bd[0].ltp_gain = ctx->ltp_gain[0];
1072 bd[0].quant_cof = ctx->quant_cof[0];
1073 bd[0].lpc_cof = ctx->lpc_cof[0];
1074 bd[0].prev_raw_samples = ctx->prev_raw_samples;
1075 bd[0].js_blocks = *js_blocks;
1077 bd[1].ra_block = ra_frame;
1078 bd[1].use_ltp = ctx->use_ltp;
1079 bd[1].ltp_lag = ctx->ltp_lag;
1080 bd[1].ltp_gain = ctx->ltp_gain[0];
1081 bd[1].quant_cof = ctx->quant_cof[0];
1082 bd[1].lpc_cof = ctx->lpc_cof[0];
1083 bd[1].prev_raw_samples = ctx->prev_raw_samples;
1084 bd[1].js_blocks = *(js_blocks + 1);
1086 // decode all blocks
1087 for (b = 0; b < ctx->num_blocks; b++) {
1090 bd[0].shift_lsbs = 0;
1091 bd[1].shift_lsbs = 0;
1093 bd[0].block_length = div_blocks[b];
1094 bd[1].block_length = div_blocks[b];
1096 bd[0].raw_samples = ctx->raw_samples[c ] + offset;
1097 bd[1].raw_samples = ctx->raw_samples[c + 1] + offset;
1099 bd[0].raw_other = bd[1].raw_samples;
1100 bd[1].raw_other = bd[0].raw_samples;
1102 if(read_decode_block(ctx, &bd[0]) || read_decode_block(ctx, &bd[1])) {
1103 // damaged block, write zero for the rest of the frame
1104 zero_remaining(b, ctx->num_blocks, div_blocks, bd[0].raw_samples);
1105 zero_remaining(b, ctx->num_blocks, div_blocks, bd[1].raw_samples);
1109 // reconstruct joint-stereo blocks
1110 if (bd[0].js_blocks) {
1111 if (bd[1].js_blocks)
1112 av_log(ctx->avctx, AV_LOG_WARNING, "Invalid channel pair!\n");
1114 for (s = 0; s < div_blocks[b]; s++)
1115 bd[0].raw_samples[s] = bd[1].raw_samples[s] - bd[0].raw_samples[s];
1116 } else if (bd[1].js_blocks) {
1117 for (s = 0; s < div_blocks[b]; s++)
1118 bd[1].raw_samples[s] = bd[1].raw_samples[s] + bd[0].raw_samples[s];
1121 offset += div_blocks[b];
1126 // store carryover raw samples,
1127 // the others channel raw samples are stored by the calling function.
1128 memmove(ctx->raw_samples[c] - sconf->max_order,
1129 ctx->raw_samples[c] - sconf->max_order + sconf->frame_length,
1130 sizeof(*ctx->raw_samples[c]) * sconf->max_order);
1136 /** Read the channel data.
1138 static int read_channel_data(ALSDecContext *ctx, ALSChannelData *cd, int c)
1140 GetBitContext *gb = &ctx->gb;
1141 ALSChannelData *current = cd;
1142 unsigned int channels = ctx->avctx->channels;
1145 while (entries < channels && !(current->stop_flag = get_bits1(gb))) {
1146 current->master_channel = get_bits_long(gb, av_ceil_log2(channels));
1148 if (current->master_channel >= channels) {
1149 av_log(ctx->avctx, AV_LOG_ERROR, "Invalid master channel!\n");
1153 if (current->master_channel != c) {
1154 current->time_diff_flag = get_bits1(gb);
1155 current->weighting[0] = mcc_weightings[av_clip(decode_rice(gb, 1) + 16, 0, 32)];
1156 current->weighting[1] = mcc_weightings[av_clip(decode_rice(gb, 2) + 14, 0, 32)];
1157 current->weighting[2] = mcc_weightings[av_clip(decode_rice(gb, 1) + 16, 0, 32)];
1159 if (current->time_diff_flag) {
1160 current->weighting[3] = mcc_weightings[av_clip(decode_rice(gb, 1) + 16, 0, 32)];
1161 current->weighting[4] = mcc_weightings[av_clip(decode_rice(gb, 1) + 16, 0, 32)];
1162 current->weighting[5] = mcc_weightings[av_clip(decode_rice(gb, 1) + 16, 0, 32)];
1164 current->time_diff_sign = get_bits1(gb);
1165 current->time_diff_index = get_bits(gb, ctx->ltp_lag_length - 3) + 3;
1173 if (entries == channels) {
1174 av_log(ctx->avctx, AV_LOG_ERROR, "Damaged channel data!\n");
1183 /** Recursively reverts the inter-channel correlation for a block.
1185 static int revert_channel_correlation(ALSDecContext *ctx, ALSBlockData *bd,
1186 ALSChannelData **cd, int *reverted,
1187 unsigned int offset, int c)
1189 ALSChannelData *ch = cd[c];
1190 unsigned int dep = 0;
1191 unsigned int channels = ctx->avctx->channels;
1198 while (dep < channels && !ch[dep].stop_flag) {
1199 revert_channel_correlation(ctx, bd, cd, reverted, offset,
1200 ch[dep].master_channel);
1205 if (dep == channels) {
1206 av_log(ctx->avctx, AV_LOG_WARNING, "Invalid channel correlation!\n");
1210 bd->use_ltp = ctx->use_ltp + c;
1211 bd->ltp_lag = ctx->ltp_lag + c;
1212 bd->ltp_gain = ctx->ltp_gain[c];
1213 bd->lpc_cof = ctx->lpc_cof[c];
1214 bd->quant_cof = ctx->quant_cof[c];
1215 bd->raw_samples = ctx->raw_samples[c] + offset;
1218 while (!ch[dep].stop_flag) {
1220 unsigned int begin = 1;
1221 unsigned int end = bd->block_length - 1;
1223 int32_t *master = ctx->raw_samples[ch[dep].master_channel] + offset;
1225 if (ch[dep].time_diff_flag) {
1226 int t = ch[dep].time_diff_index;
1228 if (ch[dep].time_diff_sign) {
1235 for (smp = begin; smp < end; smp++) {
1237 MUL64(ch[dep].weighting[0], master[smp - 1 ]) +
1238 MUL64(ch[dep].weighting[1], master[smp ]) +
1239 MUL64(ch[dep].weighting[2], master[smp + 1 ]) +
1240 MUL64(ch[dep].weighting[3], master[smp - 1 + t]) +
1241 MUL64(ch[dep].weighting[4], master[smp + t]) +
1242 MUL64(ch[dep].weighting[5], master[smp + 1 + t]);
1244 bd->raw_samples[smp] += y >> 7;
1247 for (smp = begin; smp < end; smp++) {
1249 MUL64(ch[dep].weighting[0], master[smp - 1]) +
1250 MUL64(ch[dep].weighting[1], master[smp ]) +
1251 MUL64(ch[dep].weighting[2], master[smp + 1]);
1253 bd->raw_samples[smp] += y >> 7;
1264 /** Read the frame data.
1266 static int read_frame_data(ALSDecContext *ctx, unsigned int ra_frame)
1268 ALSSpecificConfig *sconf = &ctx->sconf;
1269 AVCodecContext *avctx = ctx->avctx;
1270 GetBitContext *gb = &ctx->gb;
1271 unsigned int div_blocks[32]; ///< block sizes.
1273 unsigned int js_blocks[2];
1275 uint32_t bs_info = 0;
1277 // skip the size of the ra unit if present in the frame
1278 if (sconf->ra_flag == RA_FLAG_FRAMES && ra_frame)
1279 skip_bits_long(gb, 32);
1281 if (sconf->mc_coding && sconf->joint_stereo) {
1282 ctx->js_switch = get_bits1(gb);
1286 if (!sconf->mc_coding || ctx->js_switch) {
1287 int independent_bs = !sconf->joint_stereo;
1289 for (c = 0; c < avctx->channels; c++) {
1293 get_block_sizes(ctx, div_blocks, &bs_info);
1295 // if joint_stereo and block_switching is set, independent decoding
1296 // is signaled via the first bit of bs_info
1297 if (sconf->joint_stereo && sconf->block_switching)
1301 // if this is the last channel, it has to be decoded independently
1302 if (c == avctx->channels - 1)
1305 if (independent_bs) {
1306 if (decode_blocks_ind(ctx, ra_frame, c, div_blocks, js_blocks))
1311 if (decode_blocks(ctx, ra_frame, c, div_blocks, js_blocks))
1317 // store carryover raw samples
1318 memmove(ctx->raw_samples[c] - sconf->max_order,
1319 ctx->raw_samples[c] - sconf->max_order + sconf->frame_length,
1320 sizeof(*ctx->raw_samples[c]) * sconf->max_order);
1322 } else { // multi-channel coding
1325 int *reverted_channels = ctx->reverted_channels;
1326 unsigned int offset = 0;
1328 for (c = 0; c < avctx->channels; c++)
1329 if (ctx->chan_data[c] < ctx->chan_data_buffer) {
1330 av_log(ctx->avctx, AV_LOG_ERROR, "Invalid channel data!\n");
1334 memset(&bd, 0, sizeof(ALSBlockData));
1335 memset(reverted_channels, 0, sizeof(*reverted_channels) * avctx->channels);
1337 bd.ra_block = ra_frame;
1338 bd.prev_raw_samples = ctx->prev_raw_samples;
1340 get_block_sizes(ctx, div_blocks, &bs_info);
1342 for (b = 0; b < ctx->num_blocks; b++) {
1344 bd.block_length = div_blocks[b];
1346 for (c = 0; c < avctx->channels; c++) {
1347 bd.use_ltp = ctx->use_ltp + c;
1348 bd.ltp_lag = ctx->ltp_lag + c;
1349 bd.ltp_gain = ctx->ltp_gain[c];
1350 bd.lpc_cof = ctx->lpc_cof[c];
1351 bd.quant_cof = ctx->quant_cof[c];
1352 bd.raw_samples = ctx->raw_samples[c] + offset;
1353 bd.raw_other = NULL;
1355 read_block(ctx, &bd);
1356 if (read_channel_data(ctx, ctx->chan_data[c], c))
1360 for (c = 0; c < avctx->channels; c++)
1361 if (revert_channel_correlation(ctx, &bd, ctx->chan_data,
1362 reverted_channels, offset, c))
1365 for (c = 0; c < avctx->channels; c++) {
1366 bd.use_ltp = ctx->use_ltp + c;
1367 bd.ltp_lag = ctx->ltp_lag + c;
1368 bd.ltp_gain = ctx->ltp_gain[c];
1369 bd.lpc_cof = ctx->lpc_cof[c];
1370 bd.quant_cof = ctx->quant_cof[c];
1371 bd.raw_samples = ctx->raw_samples[c] + offset;
1372 decode_block(ctx, &bd);
1375 memset(reverted_channels, 0, avctx->channels * sizeof(*reverted_channels));
1376 offset += div_blocks[b];
1380 // store carryover raw samples
1381 for (c = 0; c < avctx->channels; c++)
1382 memmove(ctx->raw_samples[c] - sconf->max_order,
1383 ctx->raw_samples[c] - sconf->max_order + sconf->frame_length,
1384 sizeof(*ctx->raw_samples[c]) * sconf->max_order);
1387 // TODO: read_diff_float_data
1393 /** Decode an ALS frame.
1395 static int decode_frame(AVCodecContext *avctx,
1396 void *data, int *data_size,
1399 ALSDecContext *ctx = avctx->priv_data;
1400 ALSSpecificConfig *sconf = &ctx->sconf;
1401 const uint8_t *buffer = avpkt->data;
1402 int buffer_size = avpkt->size;
1403 int invalid_frame, size;
1404 unsigned int c, sample, ra_frame, bytes_read, shift;
1406 init_get_bits(&ctx->gb, buffer, buffer_size * 8);
1408 // In the case that the distance between random access frames is set to zero
1409 // (sconf->ra_distance == 0) no frame is treated as a random access frame.
1410 // For the first frame, if prediction is used, all samples used from the
1411 // previous frame are assumed to be zero.
1412 ra_frame = sconf->ra_distance && !(ctx->frame_id % sconf->ra_distance);
1414 // the last frame to decode might have a different length
1415 if (sconf->samples != 0xFFFFFFFF)
1416 ctx->cur_frame_length = FFMIN(sconf->samples - ctx->frame_id * (uint64_t) sconf->frame_length,
1417 sconf->frame_length);
1419 ctx->cur_frame_length = sconf->frame_length;
1421 // decode the frame data
1422 if ((invalid_frame = read_frame_data(ctx, ra_frame) < 0))
1423 av_log(ctx->avctx, AV_LOG_WARNING,
1424 "Reading frame data failed. Skipping RA unit.\n");
1428 // check for size of decoded data
1429 size = ctx->cur_frame_length * avctx->channels *
1430 (av_get_bits_per_sample_fmt(avctx->sample_fmt) >> 3);
1432 if (size > *data_size) {
1433 av_log(avctx, AV_LOG_ERROR, "Decoded data exceeds buffer size.\n");
1439 // transform decoded frame into output format
1440 #define INTERLEAVE_OUTPUT(bps) \
1442 int##bps##_t *dest = (int##bps##_t*) data; \
1443 shift = bps - ctx->avctx->bits_per_raw_sample; \
1444 for (sample = 0; sample < ctx->cur_frame_length; sample++) \
1445 for (c = 0; c < avctx->channels; c++) \
1446 *dest++ = ctx->raw_samples[c][sample] << shift; \
1449 if (ctx->avctx->bits_per_raw_sample <= 16) {
1450 INTERLEAVE_OUTPUT(16)
1452 INTERLEAVE_OUTPUT(32)
1456 if (sconf->crc_enabled && avctx->error_recognition >= FF_ER_CAREFUL) {
1457 int swap = HAVE_BIGENDIAN != sconf->msb_first;
1459 if (ctx->avctx->bits_per_raw_sample == 24) {
1460 int32_t *src = data;
1463 sample < ctx->cur_frame_length * avctx->channels;
1468 v = av_bswap32(src[sample]);
1471 if (!HAVE_BIGENDIAN)
1474 ctx->crc = av_crc(ctx->crc_table, ctx->crc, (uint8_t*)(&v), 3);
1477 uint8_t *crc_source;
1480 if (ctx->avctx->bits_per_raw_sample <= 16) {
1481 int16_t *src = (int16_t*) data;
1482 int16_t *dest = (int16_t*) ctx->crc_buffer;
1484 sample < ctx->cur_frame_length * avctx->channels;
1486 *dest++ = av_bswap16(src[sample]);
1488 ctx->dsp.bswap_buf((uint32_t*)ctx->crc_buffer, data,
1489 ctx->cur_frame_length * avctx->channels);
1491 crc_source = ctx->crc_buffer;
1496 ctx->crc = av_crc(ctx->crc_table, ctx->crc, crc_source, size);
1500 // check CRC sums if this is the last frame
1501 if (ctx->cur_frame_length != sconf->frame_length &&
1502 ctx->crc_org != ctx->crc) {
1503 av_log(avctx, AV_LOG_ERROR, "CRC error.\n");
1508 bytes_read = invalid_frame ? buffer_size :
1509 (get_bits_count(&ctx->gb) + 7) >> 3;
1515 /** Uninitialize the ALS decoder.
1517 static av_cold int decode_end(AVCodecContext *avctx)
1519 ALSDecContext *ctx = avctx->priv_data;
1521 av_freep(&ctx->sconf.chan_pos);
1523 ff_bgmc_end(&ctx->bgmc_lut, &ctx->bgmc_lut_status);
1525 av_freep(&ctx->use_ltp);
1526 av_freep(&ctx->ltp_lag);
1527 av_freep(&ctx->ltp_gain);
1528 av_freep(&ctx->ltp_gain_buffer);
1529 av_freep(&ctx->quant_cof);
1530 av_freep(&ctx->lpc_cof);
1531 av_freep(&ctx->quant_cof_buffer);
1532 av_freep(&ctx->lpc_cof_buffer);
1533 av_freep(&ctx->lpc_cof_reversed_buffer);
1534 av_freep(&ctx->prev_raw_samples);
1535 av_freep(&ctx->raw_samples);
1536 av_freep(&ctx->raw_buffer);
1537 av_freep(&ctx->chan_data);
1538 av_freep(&ctx->chan_data_buffer);
1539 av_freep(&ctx->reverted_channels);
1545 /** Initialize the ALS decoder.
1547 static av_cold int decode_init(AVCodecContext *avctx)
1550 unsigned int channel_size;
1552 ALSDecContext *ctx = avctx->priv_data;
1553 ALSSpecificConfig *sconf = &ctx->sconf;
1556 if (!avctx->extradata) {
1557 av_log(avctx, AV_LOG_ERROR, "Missing required ALS extradata.\n");
1561 if (read_specific_config(ctx)) {
1562 av_log(avctx, AV_LOG_ERROR, "Reading ALSSpecificConfig failed.\n");
1567 if (check_specific_config(ctx)) {
1573 ff_bgmc_init(avctx, &ctx->bgmc_lut, &ctx->bgmc_lut_status);
1575 if (sconf->floating) {
1576 avctx->sample_fmt = AV_SAMPLE_FMT_FLT;
1577 avctx->bits_per_raw_sample = 32;
1579 avctx->sample_fmt = sconf->resolution > 1
1580 ? AV_SAMPLE_FMT_S32 : AV_SAMPLE_FMT_S16;
1581 avctx->bits_per_raw_sample = (sconf->resolution + 1) * 8;
1584 // set maximum Rice parameter for progressive decoding based on resolution
1585 // This is not specified in 14496-3 but actually done by the reference
1586 // codec RM22 revision 2.
1587 ctx->s_max = sconf->resolution > 1 ? 31 : 15;
1589 // set lag value for long-term prediction
1590 ctx->ltp_lag_length = 8 + (avctx->sample_rate >= 96000) +
1591 (avctx->sample_rate >= 192000);
1593 // allocate quantized parcor coefficient buffer
1594 num_buffers = sconf->mc_coding ? avctx->channels : 1;
1596 ctx->quant_cof = av_malloc(sizeof(*ctx->quant_cof) * num_buffers);
1597 ctx->lpc_cof = av_malloc(sizeof(*ctx->lpc_cof) * num_buffers);
1598 ctx->quant_cof_buffer = av_malloc(sizeof(*ctx->quant_cof_buffer) *
1599 num_buffers * sconf->max_order);
1600 ctx->lpc_cof_buffer = av_malloc(sizeof(*ctx->lpc_cof_buffer) *
1601 num_buffers * sconf->max_order);
1602 ctx->lpc_cof_reversed_buffer = av_malloc(sizeof(*ctx->lpc_cof_buffer) *
1605 if (!ctx->quant_cof || !ctx->lpc_cof ||
1606 !ctx->quant_cof_buffer || !ctx->lpc_cof_buffer ||
1607 !ctx->lpc_cof_reversed_buffer) {
1608 av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
1609 return AVERROR(ENOMEM);
1612 // assign quantized parcor coefficient buffers
1613 for (c = 0; c < num_buffers; c++) {
1614 ctx->quant_cof[c] = ctx->quant_cof_buffer + c * sconf->max_order;
1615 ctx->lpc_cof[c] = ctx->lpc_cof_buffer + c * sconf->max_order;
1618 // allocate and assign lag and gain data buffer for ltp mode
1619 ctx->use_ltp = av_mallocz(sizeof(*ctx->use_ltp) * num_buffers);
1620 ctx->ltp_lag = av_malloc (sizeof(*ctx->ltp_lag) * num_buffers);
1621 ctx->ltp_gain = av_malloc (sizeof(*ctx->ltp_gain) * num_buffers);
1622 ctx->ltp_gain_buffer = av_malloc (sizeof(*ctx->ltp_gain_buffer) *
1625 if (!ctx->use_ltp || !ctx->ltp_lag ||
1626 !ctx->ltp_gain || !ctx->ltp_gain_buffer) {
1627 av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
1629 return AVERROR(ENOMEM);
1632 for (c = 0; c < num_buffers; c++)
1633 ctx->ltp_gain[c] = ctx->ltp_gain_buffer + c * 5;
1635 // allocate and assign channel data buffer for mcc mode
1636 if (sconf->mc_coding) {
1637 ctx->chan_data_buffer = av_malloc(sizeof(*ctx->chan_data_buffer) *
1638 num_buffers * num_buffers);
1639 ctx->chan_data = av_malloc(sizeof(*ctx->chan_data) *
1641 ctx->reverted_channels = av_malloc(sizeof(*ctx->reverted_channels) *
1644 if (!ctx->chan_data_buffer || !ctx->chan_data || !ctx->reverted_channels) {
1645 av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
1647 return AVERROR(ENOMEM);
1650 for (c = 0; c < num_buffers; c++)
1651 ctx->chan_data[c] = ctx->chan_data_buffer + c * num_buffers;
1653 ctx->chan_data = NULL;
1654 ctx->chan_data_buffer = NULL;
1655 ctx->reverted_channels = NULL;
1658 avctx->frame_size = sconf->frame_length;
1659 channel_size = sconf->frame_length + sconf->max_order;
1661 ctx->prev_raw_samples = av_malloc (sizeof(*ctx->prev_raw_samples) * sconf->max_order);
1662 ctx->raw_buffer = av_mallocz(sizeof(*ctx-> raw_buffer) * avctx->channels * channel_size);
1663 ctx->raw_samples = av_malloc (sizeof(*ctx-> raw_samples) * avctx->channels);
1665 // allocate previous raw sample buffer
1666 if (!ctx->prev_raw_samples || !ctx->raw_buffer|| !ctx->raw_samples) {
1667 av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
1669 return AVERROR(ENOMEM);
1672 // assign raw samples buffers
1673 ctx->raw_samples[0] = ctx->raw_buffer + sconf->max_order;
1674 for (c = 1; c < avctx->channels; c++)
1675 ctx->raw_samples[c] = ctx->raw_samples[c - 1] + channel_size;
1677 // allocate crc buffer
1678 if (HAVE_BIGENDIAN != sconf->msb_first && sconf->crc_enabled &&
1679 avctx->error_recognition >= FF_ER_CAREFUL) {
1680 ctx->crc_buffer = av_malloc(sizeof(*ctx->crc_buffer) *
1681 ctx->cur_frame_length *
1683 (av_get_bits_per_sample_fmt(avctx->sample_fmt) >> 3));
1684 if (!ctx->crc_buffer) {
1685 av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
1687 return AVERROR(ENOMEM);
1691 dsputil_init(&ctx->dsp, avctx);
1697 /** Flush (reset) the frame ID after seeking.
1699 static av_cold void flush(AVCodecContext *avctx)
1701 ALSDecContext *ctx = avctx->priv_data;
1707 AVCodec als_decoder = {
1711 sizeof(ALSDecContext),
1717 .capabilities = CODEC_CAP_SUBFRAMES,
1718 .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 Audio Lossless Coding (ALS)"),