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"
40 #include "libavutil/samplefmt.h"
41 #include "libavutil/crc.h"
45 /** Rice parameters and corresponding index offsets for decoding the
46 * indices of scaled PARCOR values. The table chosen is set globally
47 * by the encoder and stored in ALSSpecificConfig.
49 static const int8_t parcor_rice_table[3][20][2] = {
50 { {-52, 4}, {-29, 5}, {-31, 4}, { 19, 4}, {-16, 4},
51 { 12, 3}, { -7, 3}, { 9, 3}, { -5, 3}, { 6, 3},
52 { -4, 3}, { 3, 3}, { -3, 2}, { 3, 2}, { -2, 2},
53 { 3, 2}, { -1, 2}, { 2, 2}, { -1, 2}, { 2, 2} },
54 { {-58, 3}, {-42, 4}, {-46, 4}, { 37, 5}, {-36, 4},
55 { 29, 4}, {-29, 4}, { 25, 4}, {-23, 4}, { 20, 4},
56 {-17, 4}, { 16, 4}, {-12, 4}, { 12, 3}, {-10, 4},
57 { 7, 3}, { -4, 4}, { 3, 3}, { -1, 3}, { 1, 3} },
58 { {-59, 3}, {-45, 5}, {-50, 4}, { 38, 4}, {-39, 4},
59 { 32, 4}, {-30, 4}, { 25, 3}, {-23, 3}, { 20, 3},
60 {-20, 3}, { 16, 3}, {-13, 3}, { 10, 3}, { -7, 3},
61 { 3, 3}, { 0, 3}, { -1, 3}, { 2, 3}, { -1, 2} }
65 /** Scaled PARCOR values used for the first two PARCOR coefficients.
66 * To be indexed by the Rice coded indices.
67 * Generated by: parcor_scaled_values[i] = 32 + ((i * (i+1)) << 7) - (1 << 20)
68 * Actual values are divided by 32 in order to be stored in 16 bits.
70 static const int16_t parcor_scaled_values[] = {
71 -1048544 / 32, -1048288 / 32, -1047776 / 32, -1047008 / 32,
72 -1045984 / 32, -1044704 / 32, -1043168 / 32, -1041376 / 32,
73 -1039328 / 32, -1037024 / 32, -1034464 / 32, -1031648 / 32,
74 -1028576 / 32, -1025248 / 32, -1021664 / 32, -1017824 / 32,
75 -1013728 / 32, -1009376 / 32, -1004768 / 32, -999904 / 32,
76 -994784 / 32, -989408 / 32, -983776 / 32, -977888 / 32,
77 -971744 / 32, -965344 / 32, -958688 / 32, -951776 / 32,
78 -944608 / 32, -937184 / 32, -929504 / 32, -921568 / 32,
79 -913376 / 32, -904928 / 32, -896224 / 32, -887264 / 32,
80 -878048 / 32, -868576 / 32, -858848 / 32, -848864 / 32,
81 -838624 / 32, -828128 / 32, -817376 / 32, -806368 / 32,
82 -795104 / 32, -783584 / 32, -771808 / 32, -759776 / 32,
83 -747488 / 32, -734944 / 32, -722144 / 32, -709088 / 32,
84 -695776 / 32, -682208 / 32, -668384 / 32, -654304 / 32,
85 -639968 / 32, -625376 / 32, -610528 / 32, -595424 / 32,
86 -580064 / 32, -564448 / 32, -548576 / 32, -532448 / 32,
87 -516064 / 32, -499424 / 32, -482528 / 32, -465376 / 32,
88 -447968 / 32, -430304 / 32, -412384 / 32, -394208 / 32,
89 -375776 / 32, -357088 / 32, -338144 / 32, -318944 / 32,
90 -299488 / 32, -279776 / 32, -259808 / 32, -239584 / 32,
91 -219104 / 32, -198368 / 32, -177376 / 32, -156128 / 32,
92 -134624 / 32, -112864 / 32, -90848 / 32, -68576 / 32,
93 -46048 / 32, -23264 / 32, -224 / 32, 23072 / 32,
94 46624 / 32, 70432 / 32, 94496 / 32, 118816 / 32,
95 143392 / 32, 168224 / 32, 193312 / 32, 218656 / 32,
96 244256 / 32, 270112 / 32, 296224 / 32, 322592 / 32,
97 349216 / 32, 376096 / 32, 403232 / 32, 430624 / 32,
98 458272 / 32, 486176 / 32, 514336 / 32, 542752 / 32,
99 571424 / 32, 600352 / 32, 629536 / 32, 658976 / 32,
100 688672 / 32, 718624 / 32, 748832 / 32, 779296 / 32,
101 810016 / 32, 840992 / 32, 872224 / 32, 903712 / 32,
102 935456 / 32, 967456 / 32, 999712 / 32, 1032224 / 32
106 /** Gain values of p(0) for long-term prediction.
107 * To be indexed by the Rice coded indices.
109 static const uint8_t ltp_gain_values [4][4] = {
117 /** Inter-channel weighting factors for multi-channel correlation.
118 * To be indexed by the Rice coded indices.
120 static const int16_t mcc_weightings[] = {
121 204, 192, 179, 166, 153, 140, 128, 115,
122 102, 89, 76, 64, 51, 38, 25, 12,
123 0, -12, -25, -38, -51, -64, -76, -89,
124 -102, -115, -128, -140, -153, -166, -179, -192
128 /** Tail codes used in arithmetic coding using block Gilbert-Moore codes.
130 static const uint8_t tail_code[16][6] = {
131 { 74, 44, 25, 13, 7, 3},
132 { 68, 42, 24, 13, 7, 3},
133 { 58, 39, 23, 13, 7, 3},
134 {126, 70, 37, 19, 10, 5},
135 {132, 70, 37, 20, 10, 5},
136 {124, 70, 38, 20, 10, 5},
137 {120, 69, 37, 20, 11, 5},
138 {116, 67, 37, 20, 11, 5},
139 {108, 66, 36, 20, 10, 5},
140 {102, 62, 36, 20, 10, 5},
141 { 88, 58, 34, 19, 10, 5},
142 {162, 89, 49, 25, 13, 7},
143 {156, 87, 49, 26, 14, 7},
144 {150, 86, 47, 26, 14, 7},
145 {142, 84, 47, 26, 14, 7},
146 {131, 79, 46, 26, 14, 7}
158 uint32_t samples; ///< number of samples, 0xFFFFFFFF if unknown
159 int resolution; ///< 000 = 8-bit; 001 = 16-bit; 010 = 24-bit; 011 = 32-bit
160 int floating; ///< 1 = IEEE 32-bit floating-point, 0 = integer
161 int msb_first; ///< 1 = original CRC calculated on big-endian system, 0 = little-endian
162 int frame_length; ///< frame length for each frame (last frame may differ)
163 int ra_distance; ///< distance between RA frames (in frames, 0...255)
164 enum RA_Flag ra_flag; ///< indicates where the size of ra units is stored
165 int adapt_order; ///< adaptive order: 1 = on, 0 = off
166 int coef_table; ///< table index of Rice code parameters
167 int long_term_prediction; ///< long term prediction (LTP): 1 = on, 0 = off
168 int max_order; ///< maximum prediction order (0..1023)
169 int block_switching; ///< number of block switching levels
170 int bgmc; ///< "Block Gilbert-Moore Code": 1 = on, 0 = off (Rice coding only)
171 int sb_part; ///< sub-block partition
172 int joint_stereo; ///< joint stereo: 1 = on, 0 = off
173 int mc_coding; ///< extended inter-channel coding (multi channel coding): 1 = on, 0 = off
174 int chan_config; ///< indicates that a chan_config_info field is present
175 int chan_sort; ///< channel rearrangement: 1 = on, 0 = off
176 int rlslms; ///< use "Recursive Least Square-Least Mean Square" predictor: 1 = on, 0 = off
177 int chan_config_info; ///< mapping of channels to loudspeaker locations. Unused until setting channel configuration is implemented.
178 int *chan_pos; ///< original channel positions
179 int crc_enabled; ///< enable Cyclic Redundancy Checksum
194 AVCodecContext *avctx;
196 ALSSpecificConfig sconf;
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
235 unsigned int block_length; ///< number of samples within the block
236 unsigned int ra_block; ///< if true, this is a random access block
237 int *const_block; ///< if true, this is a constant value block
238 int js_blocks; ///< true if this block contains a difference signal
239 unsigned int *shift_lsbs; ///< shift of values for this block
240 unsigned int *opt_order; ///< prediction order of this block
241 int *store_prev_samples;///< if true, carryover samples have to be stored
242 int *use_ltp; ///< if true, long-term prediction is used
243 int *ltp_lag; ///< lag value for long-term prediction
244 int *ltp_gain; ///< gain values for ltp 5-tap filter
245 int32_t *quant_cof; ///< quantized parcor coefficients
246 int32_t *lpc_cof; ///< coefficients of the direct form prediction
247 int32_t *raw_samples; ///< decoded raw samples / residuals for this block
248 int32_t *prev_raw_samples; ///< contains unshifted raw samples from the previous block
249 int32_t *raw_other; ///< decoded raw samples of the other channel of a channel pair
253 static av_cold void dprint_specific_config(ALSDecContext *ctx)
256 AVCodecContext *avctx = ctx->avctx;
257 ALSSpecificConfig *sconf = &ctx->sconf;
259 av_dlog(avctx, "resolution = %i\n", sconf->resolution);
260 av_dlog(avctx, "floating = %i\n", sconf->floating);
261 av_dlog(avctx, "frame_length = %i\n", sconf->frame_length);
262 av_dlog(avctx, "ra_distance = %i\n", sconf->ra_distance);
263 av_dlog(avctx, "ra_flag = %i\n", sconf->ra_flag);
264 av_dlog(avctx, "adapt_order = %i\n", sconf->adapt_order);
265 av_dlog(avctx, "coef_table = %i\n", sconf->coef_table);
266 av_dlog(avctx, "long_term_prediction = %i\n", sconf->long_term_prediction);
267 av_dlog(avctx, "max_order = %i\n", sconf->max_order);
268 av_dlog(avctx, "block_switching = %i\n", sconf->block_switching);
269 av_dlog(avctx, "bgmc = %i\n", sconf->bgmc);
270 av_dlog(avctx, "sb_part = %i\n", sconf->sb_part);
271 av_dlog(avctx, "joint_stereo = %i\n", sconf->joint_stereo);
272 av_dlog(avctx, "mc_coding = %i\n", sconf->mc_coding);
273 av_dlog(avctx, "chan_config = %i\n", sconf->chan_config);
274 av_dlog(avctx, "chan_sort = %i\n", sconf->chan_sort);
275 av_dlog(avctx, "RLSLMS = %i\n", sconf->rlslms);
276 av_dlog(avctx, "chan_config_info = %i\n", sconf->chan_config_info);
281 /** Read an ALSSpecificConfig from a buffer into the output struct.
283 static av_cold int read_specific_config(ALSDecContext *ctx)
287 int i, config_offset;
288 MPEG4AudioConfig m4ac;
289 ALSSpecificConfig *sconf = &ctx->sconf;
290 AVCodecContext *avctx = ctx->avctx;
291 uint32_t als_id, header_size, trailer_size;
294 if ((ret = init_get_bits8(&gb, avctx->extradata, avctx->extradata_size)) < 0)
297 config_offset = avpriv_mpeg4audio_get_config(&m4ac, avctx->extradata,
298 avctx->extradata_size * 8, 1);
300 if (config_offset < 0)
303 skip_bits_long(&gb, config_offset);
305 if (get_bits_left(&gb) < (30 << 3))
308 // read the fixed items
309 als_id = get_bits_long(&gb, 32);
310 avctx->sample_rate = m4ac.sample_rate;
311 skip_bits_long(&gb, 32); // sample rate already known
312 sconf->samples = get_bits_long(&gb, 32);
313 avctx->channels = m4ac.channels;
314 skip_bits(&gb, 16); // number of channels already known
315 skip_bits(&gb, 3); // skip file_type
316 sconf->resolution = get_bits(&gb, 3);
317 sconf->floating = get_bits1(&gb);
318 sconf->msb_first = get_bits1(&gb);
319 sconf->frame_length = get_bits(&gb, 16) + 1;
320 sconf->ra_distance = get_bits(&gb, 8);
321 sconf->ra_flag = get_bits(&gb, 2);
322 sconf->adapt_order = get_bits1(&gb);
323 sconf->coef_table = get_bits(&gb, 2);
324 sconf->long_term_prediction = get_bits1(&gb);
325 sconf->max_order = get_bits(&gb, 10);
326 sconf->block_switching = get_bits(&gb, 2);
327 sconf->bgmc = get_bits1(&gb);
328 sconf->sb_part = get_bits1(&gb);
329 sconf->joint_stereo = get_bits1(&gb);
330 sconf->mc_coding = get_bits1(&gb);
331 sconf->chan_config = get_bits1(&gb);
332 sconf->chan_sort = get_bits1(&gb);
333 sconf->crc_enabled = get_bits1(&gb);
334 sconf->rlslms = get_bits1(&gb);
335 skip_bits(&gb, 5); // skip 5 reserved bits
336 skip_bits1(&gb); // skip aux_data_enabled
339 // check for ALSSpecificConfig struct
340 if (als_id != MKBETAG('A','L','S','\0'))
343 ctx->cur_frame_length = sconf->frame_length;
345 // read channel config
346 if (sconf->chan_config)
347 sconf->chan_config_info = get_bits(&gb, 16);
348 // TODO: use this to set avctx->channel_layout
351 // read channel sorting
352 if (sconf->chan_sort && avctx->channels > 1) {
353 int chan_pos_bits = av_ceil_log2(avctx->channels);
354 int bits_needed = avctx->channels * chan_pos_bits + 7;
355 if (get_bits_left(&gb) < bits_needed)
358 if (!(sconf->chan_pos = av_malloc(avctx->channels * sizeof(*sconf->chan_pos))))
359 return AVERROR(ENOMEM);
363 for (i = 0; i < avctx->channels; i++) {
366 idx = get_bits(&gb, chan_pos_bits);
367 if (idx >= avctx->channels) {
368 av_log(avctx, AV_LOG_WARNING, "Invalid channel reordering.\n");
372 sconf->chan_pos[idx] = i;
379 // read fixed header and trailer sizes,
380 // if size = 0xFFFFFFFF then there is no data field!
381 if (get_bits_left(&gb) < 64)
384 header_size = get_bits_long(&gb, 32);
385 trailer_size = get_bits_long(&gb, 32);
386 if (header_size == 0xFFFFFFFF)
388 if (trailer_size == 0xFFFFFFFF)
391 ht_size = ((int64_t)(header_size) + (int64_t)(trailer_size)) << 3;
394 // skip the header and trailer data
395 if (get_bits_left(&gb) < ht_size)
398 if (ht_size > INT32_MAX)
401 skip_bits_long(&gb, ht_size);
404 // initialize CRC calculation
405 if (sconf->crc_enabled) {
406 if (get_bits_left(&gb) < 32)
409 if (avctx->err_recognition & (AV_EF_CRCCHECK|AV_EF_CAREFUL)) {
410 ctx->crc_table = av_crc_get_table(AV_CRC_32_IEEE_LE);
411 ctx->crc = 0xFFFFFFFF;
412 ctx->crc_org = ~get_bits_long(&gb, 32);
414 skip_bits_long(&gb, 32);
418 // no need to read the rest of ALSSpecificConfig (ra_unit_size & aux data)
420 dprint_specific_config(ctx);
426 /** Check the ALSSpecificConfig for unsupported features.
428 static int check_specific_config(ALSDecContext *ctx)
430 ALSSpecificConfig *sconf = &ctx->sconf;
433 // report unsupported feature and set error value
434 #define MISSING_ERR(cond, str, errval) \
437 av_log_missing_feature(ctx->avctx, str, 0); \
442 MISSING_ERR(sconf->floating, "Floating point decoding", AVERROR_PATCHWELCOME);
443 MISSING_ERR(sconf->rlslms, "Adaptive RLS-LMS prediction", AVERROR_PATCHWELCOME);
449 /** Parse the bs_info field to extract the block partitioning used in
450 * block switching mode, refer to ISO/IEC 14496-3, section 11.6.2.
452 static void parse_bs_info(const uint32_t bs_info, unsigned int n,
453 unsigned int div, unsigned int **div_blocks,
454 unsigned int *num_blocks)
456 if (n < 31 && ((bs_info << n) & 0x40000000)) {
457 // if the level is valid and the investigated bit n is set
458 // then recursively check both children at bits (2n+1) and (2n+2)
461 parse_bs_info(bs_info, n + 1, div, div_blocks, num_blocks);
462 parse_bs_info(bs_info, n + 2, div, div_blocks, num_blocks);
464 // else the bit is not set or the last level has been reached
465 // (bit implicitly not set)
473 /** Read and decode a Rice codeword.
475 static int32_t decode_rice(GetBitContext *gb, unsigned int k)
477 int max = get_bits_left(gb) - k;
478 int q = get_unary(gb, 0, max);
479 int r = k ? get_bits1(gb) : !(q & 1);
483 q += get_bits_long(gb, k - 1);
491 /** Convert PARCOR coefficient k to direct filter coefficient.
493 static void parcor_to_lpc(unsigned int k, const int32_t *par, int32_t *cof)
497 for (i = 0, j = k - 1; i < j; i++, j--) {
498 int tmp1 = ((MUL64(par[k], cof[j]) + (1 << 19)) >> 20);
499 cof[j] += ((MUL64(par[k], cof[i]) + (1 << 19)) >> 20);
503 cof[i] += ((MUL64(par[k], cof[j]) + (1 << 19)) >> 20);
509 /** Read block switching field if necessary and set actual block sizes.
510 * Also assure that the block sizes of the last frame correspond to the
511 * actual number of samples.
513 static void get_block_sizes(ALSDecContext *ctx, unsigned int *div_blocks,
516 ALSSpecificConfig *sconf = &ctx->sconf;
517 GetBitContext *gb = &ctx->gb;
518 unsigned int *ptr_div_blocks = div_blocks;
521 if (sconf->block_switching) {
522 unsigned int bs_info_len = 1 << (sconf->block_switching + 2);
523 *bs_info = get_bits_long(gb, bs_info_len);
524 *bs_info <<= (32 - bs_info_len);
528 parse_bs_info(*bs_info, 0, 0, &ptr_div_blocks, &ctx->num_blocks);
530 // The last frame may have an overdetermined block structure given in
531 // the bitstream. In that case the defined block structure would need
532 // more samples than available to be consistent.
533 // The block structure is actually used but the block sizes are adapted
534 // to fit the actual number of available samples.
535 // Example: 5 samples, 2nd level block sizes: 2 2 2 2.
536 // This results in the actual block sizes: 2 2 1 0.
537 // This is not specified in 14496-3 but actually done by the reference
538 // codec RM22 revision 2.
539 // This appears to happen in case of an odd number of samples in the last
540 // frame which is actually not allowed by the block length switching part
542 // The ALS conformance files feature an odd number of samples in the last
545 for (b = 0; b < ctx->num_blocks; b++)
546 div_blocks[b] = ctx->sconf.frame_length >> div_blocks[b];
548 if (ctx->cur_frame_length != ctx->sconf.frame_length) {
549 unsigned int remaining = ctx->cur_frame_length;
551 for (b = 0; b < ctx->num_blocks; b++) {
552 if (remaining <= div_blocks[b]) {
553 div_blocks[b] = remaining;
554 ctx->num_blocks = b + 1;
558 remaining -= div_blocks[b];
564 /** Read the block data for a constant block
566 static int read_const_block_data(ALSDecContext *ctx, ALSBlockData *bd)
568 ALSSpecificConfig *sconf = &ctx->sconf;
569 AVCodecContext *avctx = ctx->avctx;
570 GetBitContext *gb = &ctx->gb;
572 if (bd->block_length <= 0)
573 return AVERROR_INVALIDDATA;
575 *bd->raw_samples = 0;
576 *bd->const_block = get_bits1(gb); // 1 = constant value, 0 = zero block (silence)
577 bd->js_blocks = get_bits1(gb);
579 // skip 5 reserved bits
582 if (*bd->const_block) {
583 unsigned int const_val_bits = sconf->floating ? 24 : avctx->bits_per_raw_sample;
584 *bd->raw_samples = get_sbits_long(gb, const_val_bits);
587 // ensure constant block decoding by reusing this field
588 *bd->const_block = 1;
594 /** Decode the block data for a constant block
596 static void decode_const_block_data(ALSDecContext *ctx, ALSBlockData *bd)
598 int smp = bd->block_length - 1;
599 int32_t val = *bd->raw_samples;
600 int32_t *dst = bd->raw_samples + 1;
602 // write raw samples into buffer
608 /** Read the block data for a non-constant block
610 static int read_var_block_data(ALSDecContext *ctx, ALSBlockData *bd)
612 ALSSpecificConfig *sconf = &ctx->sconf;
613 AVCodecContext *avctx = ctx->avctx;
614 GetBitContext *gb = &ctx->gb;
618 unsigned int sub_blocks, log2_sub_blocks, sb_length;
619 unsigned int start = 0;
620 unsigned int opt_order;
622 int32_t *quant_cof = bd->quant_cof;
623 int32_t *current_res;
626 // ensure variable block decoding by reusing this field
627 *bd->const_block = 0;
630 bd->js_blocks = get_bits1(gb);
632 opt_order = *bd->opt_order;
634 // determine the number of subblocks for entropy decoding
635 if (!sconf->bgmc && !sconf->sb_part) {
638 if (sconf->bgmc && sconf->sb_part)
639 log2_sub_blocks = get_bits(gb, 2);
641 log2_sub_blocks = 2 * get_bits1(gb);
644 sub_blocks = 1 << log2_sub_blocks;
646 // do not continue in case of a damaged stream since
647 // block_length must be evenly divisible by sub_blocks
648 if (bd->block_length & (sub_blocks - 1)) {
649 av_log(avctx, AV_LOG_WARNING,
650 "Block length is not evenly divisible by the number of subblocks.\n");
654 sb_length = bd->block_length >> log2_sub_blocks;
657 s[0] = get_bits(gb, 8 + (sconf->resolution > 1));
658 for (k = 1; k < sub_blocks; k++)
659 s[k] = s[k - 1] + decode_rice(gb, 2);
661 for (k = 0; k < sub_blocks; k++) {
666 s[0] = get_bits(gb, 4 + (sconf->resolution > 1));
667 for (k = 1; k < sub_blocks; k++)
668 s[k] = s[k - 1] + decode_rice(gb, 0);
670 for (k = 1; k < sub_blocks; k++)
672 av_log(avctx, AV_LOG_ERROR, "k invalid for rice code.\n");
673 return AVERROR_INVALIDDATA;
677 *bd->shift_lsbs = get_bits(gb, 4) + 1;
679 *bd->store_prev_samples = (bd->js_blocks && bd->raw_other) || *bd->shift_lsbs;
682 if (!sconf->rlslms) {
683 if (sconf->adapt_order) {
684 int opt_order_length = av_ceil_log2(av_clip((bd->block_length >> 3) - 1,
685 2, sconf->max_order + 1));
686 *bd->opt_order = get_bits(gb, opt_order_length);
687 if (*bd->opt_order > sconf->max_order) {
688 *bd->opt_order = sconf->max_order;
689 av_log(avctx, AV_LOG_ERROR, "Predictor order too large.\n");
690 return AVERROR_INVALIDDATA;
693 *bd->opt_order = sconf->max_order;
696 opt_order = *bd->opt_order;
701 if (sconf->coef_table == 3) {
704 // read coefficient 0
705 quant_cof[0] = 32 * parcor_scaled_values[get_bits(gb, 7)];
707 // read coefficient 1
709 quant_cof[1] = -32 * parcor_scaled_values[get_bits(gb, 7)];
711 // read coefficients 2 to opt_order
712 for (k = 2; k < opt_order; k++)
713 quant_cof[k] = get_bits(gb, 7);
718 // read coefficient 0 to 19
719 k_max = FFMIN(opt_order, 20);
720 for (k = 0; k < k_max; k++) {
721 int rice_param = parcor_rice_table[sconf->coef_table][k][1];
722 int offset = parcor_rice_table[sconf->coef_table][k][0];
723 quant_cof[k] = decode_rice(gb, rice_param) + offset;
724 if (quant_cof[k] < -64 || quant_cof[k] > 63) {
725 av_log(avctx, AV_LOG_ERROR, "quant_cof %d is out of range.\n", quant_cof[k]);
726 return AVERROR_INVALIDDATA;
730 // read coefficients 20 to 126
731 k_max = FFMIN(opt_order, 127);
732 for (; k < k_max; k++)
733 quant_cof[k] = decode_rice(gb, 2) + (k & 1);
735 // read coefficients 127 to opt_order
736 for (; k < opt_order; k++)
737 quant_cof[k] = decode_rice(gb, 1);
739 quant_cof[0] = 32 * parcor_scaled_values[quant_cof[0] + 64];
742 quant_cof[1] = -32 * parcor_scaled_values[quant_cof[1] + 64];
745 for (k = 2; k < opt_order; k++)
746 quant_cof[k] = (quant_cof[k] << 14) + (add_base << 13);
750 // read LTP gain and lag values
751 if (sconf->long_term_prediction) {
752 *bd->use_ltp = get_bits1(gb);
757 bd->ltp_gain[0] = decode_rice(gb, 1) << 3;
758 bd->ltp_gain[1] = decode_rice(gb, 2) << 3;
760 r = get_unary(gb, 0, 3);
762 bd->ltp_gain[2] = ltp_gain_values[r][c];
764 bd->ltp_gain[3] = decode_rice(gb, 2) << 3;
765 bd->ltp_gain[4] = decode_rice(gb, 1) << 3;
767 *bd->ltp_lag = get_bits(gb, ctx->ltp_lag_length);
768 *bd->ltp_lag += FFMAX(4, opt_order + 1);
772 // read first value and residuals in case of a random access block
775 bd->raw_samples[0] = decode_rice(gb, avctx->bits_per_raw_sample - 4);
777 bd->raw_samples[1] = decode_rice(gb, FFMIN(s[0] + 3, ctx->s_max));
779 bd->raw_samples[2] = decode_rice(gb, FFMIN(s[0] + 1, ctx->s_max));
781 start = FFMIN(opt_order, 3);
784 // read all residuals
788 unsigned int b = av_clip((av_ceil_log2(bd->block_length) - 3) >> 1, 0, 5);
790 // read most significant bits
795 ff_bgmc_decode_init(gb, &high, &low, &value);
797 current_res = bd->raw_samples + start;
799 for (sb = 0; sb < sub_blocks; sb++) {
800 unsigned int sb_len = sb_length - (sb ? 0 : start);
802 k [sb] = s[sb] > b ? s[sb] - b : 0;
803 delta[sb] = 5 - s[sb] + k[sb];
805 ff_bgmc_decode(gb, sb_len, current_res,
806 delta[sb], sx[sb], &high, &low, &value, ctx->bgmc_lut, ctx->bgmc_lut_status);
808 current_res += sb_len;
811 ff_bgmc_decode_end(gb);
814 // read least significant bits and tails
815 current_res = bd->raw_samples + start;
817 for (sb = 0; sb < sub_blocks; sb++, start = 0) {
818 unsigned int cur_tail_code = tail_code[sx[sb]][delta[sb]];
819 unsigned int cur_k = k[sb];
820 unsigned int cur_s = s[sb];
822 for (; start < sb_length; start++) {
823 int32_t res = *current_res;
825 if (res == cur_tail_code) {
826 unsigned int max_msb = (2 + (sx[sb] > 2) + (sx[sb] > 10))
829 res = decode_rice(gb, cur_s);
832 res += (max_msb ) << cur_k;
834 res -= (max_msb - 1) << cur_k;
837 if (res > cur_tail_code)
847 res |= get_bits_long(gb, cur_k);
851 *current_res++ = res;
855 current_res = bd->raw_samples + start;
857 for (sb = 0; sb < sub_blocks; sb++, start = 0)
858 for (; start < sb_length; start++)
859 *current_res++ = decode_rice(gb, s[sb]);
862 if (!sconf->mc_coding || ctx->js_switch)
869 /** Decode the block data for a non-constant block
871 static int decode_var_block_data(ALSDecContext *ctx, ALSBlockData *bd)
873 ALSSpecificConfig *sconf = &ctx->sconf;
874 unsigned int block_length = bd->block_length;
875 unsigned int smp = 0;
877 int opt_order = *bd->opt_order;
880 int32_t *quant_cof = bd->quant_cof;
881 int32_t *lpc_cof = bd->lpc_cof;
882 int32_t *raw_samples = bd->raw_samples;
883 int32_t *raw_samples_end = bd->raw_samples + bd->block_length;
884 int32_t *lpc_cof_reversed = ctx->lpc_cof_reversed_buffer;
886 // reverse long-term prediction
890 for (ltp_smp = FFMAX(*bd->ltp_lag - 2, 0); ltp_smp < block_length; ltp_smp++) {
891 int center = ltp_smp - *bd->ltp_lag;
892 int begin = FFMAX(0, center - 2);
893 int end = center + 3;
894 int tab = 5 - (end - begin);
899 for (base = begin; base < end; base++, tab++)
900 y += MUL64(bd->ltp_gain[tab], raw_samples[base]);
902 raw_samples[ltp_smp] += y >> 7;
906 // reconstruct all samples from residuals
908 for (smp = 0; smp < opt_order; smp++) {
911 for (sb = 0; sb < smp; sb++)
912 y += MUL64(lpc_cof[sb], raw_samples[-(sb + 1)]);
914 *raw_samples++ -= y >> 20;
915 parcor_to_lpc(smp, quant_cof, lpc_cof);
918 for (k = 0; k < opt_order; k++)
919 parcor_to_lpc(k, quant_cof, lpc_cof);
921 // store previous samples in case that they have to be altered
922 if (*bd->store_prev_samples)
923 memcpy(bd->prev_raw_samples, raw_samples - sconf->max_order,
924 sizeof(*bd->prev_raw_samples) * sconf->max_order);
926 // reconstruct difference signal for prediction (joint-stereo)
927 if (bd->js_blocks && bd->raw_other) {
928 int32_t *left, *right;
930 if (bd->raw_other > raw_samples) { // D = R - L
932 right = bd->raw_other;
933 } else { // D = R - L
934 left = bd->raw_other;
938 for (sb = -1; sb >= -sconf->max_order; sb--)
939 raw_samples[sb] = right[sb] - left[sb];
942 // reconstruct shifted signal
944 for (sb = -1; sb >= -sconf->max_order; sb--)
945 raw_samples[sb] >>= *bd->shift_lsbs;
948 // reverse linear prediction coefficients for efficiency
949 lpc_cof = lpc_cof + opt_order;
951 for (sb = 0; sb < opt_order; sb++)
952 lpc_cof_reversed[sb] = lpc_cof[-(sb + 1)];
954 // reconstruct raw samples
955 raw_samples = bd->raw_samples + smp;
956 lpc_cof = lpc_cof_reversed + opt_order;
958 for (; raw_samples < raw_samples_end; raw_samples++) {
961 for (sb = -opt_order; sb < 0; sb++)
962 y += MUL64(lpc_cof[sb], raw_samples[sb]);
964 *raw_samples -= y >> 20;
967 raw_samples = bd->raw_samples;
969 // restore previous samples in case that they have been altered
970 if (*bd->store_prev_samples)
971 memcpy(raw_samples - sconf->max_order, bd->prev_raw_samples,
972 sizeof(*raw_samples) * sconf->max_order);
978 /** Read the block data.
980 static int read_block(ALSDecContext *ctx, ALSBlockData *bd)
982 GetBitContext *gb = &ctx->gb;
986 // read block type flag and read the samples accordingly
988 if ((ret = read_var_block_data(ctx, bd)) < 0)
991 if ((ret = read_const_block_data(ctx, bd)) < 0)
999 /** Decode the block data.
1001 static int decode_block(ALSDecContext *ctx, ALSBlockData *bd)
1005 // read block type flag and read the samples accordingly
1006 if (*bd->const_block)
1007 decode_const_block_data(ctx, bd);
1008 else if (decode_var_block_data(ctx, bd))
1011 // TODO: read RLSLMS extension data
1013 if (*bd->shift_lsbs)
1014 for (smp = 0; smp < bd->block_length; smp++)
1015 bd->raw_samples[smp] <<= *bd->shift_lsbs;
1021 /** Read and decode block data successively.
1023 static int read_decode_block(ALSDecContext *ctx, ALSBlockData *bd)
1027 ret = read_block(ctx, bd);
1032 ret = decode_block(ctx, bd);
1038 /** Compute the number of samples left to decode for the current frame and
1039 * sets these samples to zero.
1041 static void zero_remaining(unsigned int b, unsigned int b_max,
1042 const unsigned int *div_blocks, int32_t *buf)
1044 unsigned int count = 0;
1047 count += div_blocks[b++];
1050 memset(buf, 0, sizeof(*buf) * count);
1054 /** Decode blocks independently.
1056 static int decode_blocks_ind(ALSDecContext *ctx, unsigned int ra_frame,
1057 unsigned int c, const unsigned int *div_blocks,
1058 unsigned int *js_blocks)
1061 ALSBlockData bd = { 0 };
1063 bd.ra_block = ra_frame;
1064 bd.const_block = ctx->const_block;
1065 bd.shift_lsbs = ctx->shift_lsbs;
1066 bd.opt_order = ctx->opt_order;
1067 bd.store_prev_samples = ctx->store_prev_samples;
1068 bd.use_ltp = ctx->use_ltp;
1069 bd.ltp_lag = ctx->ltp_lag;
1070 bd.ltp_gain = ctx->ltp_gain[0];
1071 bd.quant_cof = ctx->quant_cof[0];
1072 bd.lpc_cof = ctx->lpc_cof[0];
1073 bd.prev_raw_samples = ctx->prev_raw_samples;
1074 bd.raw_samples = ctx->raw_samples[c];
1077 for (b = 0; b < ctx->num_blocks; b++) {
1078 bd.block_length = div_blocks[b];
1080 if (read_decode_block(ctx, &bd)) {
1081 // damaged block, write zero for the rest of the frame
1082 zero_remaining(b, ctx->num_blocks, div_blocks, bd.raw_samples);
1085 bd.raw_samples += div_blocks[b];
1093 /** Decode blocks dependently.
1095 static int decode_blocks(ALSDecContext *ctx, unsigned int ra_frame,
1096 unsigned int c, const unsigned int *div_blocks,
1097 unsigned int *js_blocks)
1099 ALSSpecificConfig *sconf = &ctx->sconf;
1100 unsigned int offset = 0;
1102 ALSBlockData bd[2] = { { 0 } };
1104 bd[0].ra_block = ra_frame;
1105 bd[0].const_block = ctx->const_block;
1106 bd[0].shift_lsbs = ctx->shift_lsbs;
1107 bd[0].opt_order = ctx->opt_order;
1108 bd[0].store_prev_samples = ctx->store_prev_samples;
1109 bd[0].use_ltp = ctx->use_ltp;
1110 bd[0].ltp_lag = ctx->ltp_lag;
1111 bd[0].ltp_gain = ctx->ltp_gain[0];
1112 bd[0].quant_cof = ctx->quant_cof[0];
1113 bd[0].lpc_cof = ctx->lpc_cof[0];
1114 bd[0].prev_raw_samples = ctx->prev_raw_samples;
1115 bd[0].js_blocks = *js_blocks;
1117 bd[1].ra_block = ra_frame;
1118 bd[1].const_block = ctx->const_block;
1119 bd[1].shift_lsbs = ctx->shift_lsbs;
1120 bd[1].opt_order = ctx->opt_order;
1121 bd[1].store_prev_samples = ctx->store_prev_samples;
1122 bd[1].use_ltp = ctx->use_ltp;
1123 bd[1].ltp_lag = ctx->ltp_lag;
1124 bd[1].ltp_gain = ctx->ltp_gain[0];
1125 bd[1].quant_cof = ctx->quant_cof[0];
1126 bd[1].lpc_cof = ctx->lpc_cof[0];
1127 bd[1].prev_raw_samples = ctx->prev_raw_samples;
1128 bd[1].js_blocks = *(js_blocks + 1);
1130 // decode all blocks
1131 for (b = 0; b < ctx->num_blocks; b++) {
1134 bd[0].block_length = div_blocks[b];
1135 bd[1].block_length = div_blocks[b];
1137 bd[0].raw_samples = ctx->raw_samples[c ] + offset;
1138 bd[1].raw_samples = ctx->raw_samples[c + 1] + offset;
1140 bd[0].raw_other = bd[1].raw_samples;
1141 bd[1].raw_other = bd[0].raw_samples;
1143 if(read_decode_block(ctx, &bd[0]) || read_decode_block(ctx, &bd[1])) {
1144 // damaged block, write zero for the rest of the frame
1145 zero_remaining(b, ctx->num_blocks, div_blocks, bd[0].raw_samples);
1146 zero_remaining(b, ctx->num_blocks, div_blocks, bd[1].raw_samples);
1150 // reconstruct joint-stereo blocks
1151 if (bd[0].js_blocks) {
1152 if (bd[1].js_blocks)
1153 av_log(ctx->avctx, AV_LOG_WARNING, "Invalid channel pair.\n");
1155 for (s = 0; s < div_blocks[b]; s++)
1156 bd[0].raw_samples[s] = bd[1].raw_samples[s] - bd[0].raw_samples[s];
1157 } else if (bd[1].js_blocks) {
1158 for (s = 0; s < div_blocks[b]; s++)
1159 bd[1].raw_samples[s] = bd[1].raw_samples[s] + bd[0].raw_samples[s];
1162 offset += div_blocks[b];
1167 // store carryover raw samples,
1168 // the others channel raw samples are stored by the calling function.
1169 memmove(ctx->raw_samples[c] - sconf->max_order,
1170 ctx->raw_samples[c] - sconf->max_order + sconf->frame_length,
1171 sizeof(*ctx->raw_samples[c]) * sconf->max_order);
1177 /** Read the channel data.
1179 static int read_channel_data(ALSDecContext *ctx, ALSChannelData *cd, int c)
1181 GetBitContext *gb = &ctx->gb;
1182 ALSChannelData *current = cd;
1183 unsigned int channels = ctx->avctx->channels;
1186 while (entries < channels && !(current->stop_flag = get_bits1(gb))) {
1187 current->master_channel = get_bits_long(gb, av_ceil_log2(channels));
1189 if (current->master_channel >= channels) {
1190 av_log(ctx->avctx, AV_LOG_ERROR, "Invalid master channel.\n");
1194 if (current->master_channel != c) {
1195 current->time_diff_flag = get_bits1(gb);
1196 current->weighting[0] = mcc_weightings[av_clip(decode_rice(gb, 1) + 16, 0, 31)];
1197 current->weighting[1] = mcc_weightings[av_clip(decode_rice(gb, 2) + 14, 0, 31)];
1198 current->weighting[2] = mcc_weightings[av_clip(decode_rice(gb, 1) + 16, 0, 31)];
1200 if (current->time_diff_flag) {
1201 current->weighting[3] = mcc_weightings[av_clip(decode_rice(gb, 1) + 16, 0, 31)];
1202 current->weighting[4] = mcc_weightings[av_clip(decode_rice(gb, 1) + 16, 0, 31)];
1203 current->weighting[5] = mcc_weightings[av_clip(decode_rice(gb, 1) + 16, 0, 31)];
1205 current->time_diff_sign = get_bits1(gb);
1206 current->time_diff_index = get_bits(gb, ctx->ltp_lag_length - 3) + 3;
1214 if (entries == channels) {
1215 av_log(ctx->avctx, AV_LOG_ERROR, "Damaged channel data.\n");
1224 /** Recursively reverts the inter-channel correlation for a block.
1226 static int revert_channel_correlation(ALSDecContext *ctx, ALSBlockData *bd,
1227 ALSChannelData **cd, int *reverted,
1228 unsigned int offset, int c)
1230 ALSChannelData *ch = cd[c];
1231 unsigned int dep = 0;
1232 unsigned int channels = ctx->avctx->channels;
1239 while (dep < channels && !ch[dep].stop_flag) {
1240 revert_channel_correlation(ctx, bd, cd, reverted, offset,
1241 ch[dep].master_channel);
1246 if (dep == channels) {
1247 av_log(ctx->avctx, AV_LOG_WARNING, "Invalid channel correlation.\n");
1251 bd->const_block = ctx->const_block + c;
1252 bd->shift_lsbs = ctx->shift_lsbs + c;
1253 bd->opt_order = ctx->opt_order + c;
1254 bd->store_prev_samples = ctx->store_prev_samples + c;
1255 bd->use_ltp = ctx->use_ltp + c;
1256 bd->ltp_lag = ctx->ltp_lag + c;
1257 bd->ltp_gain = ctx->ltp_gain[c];
1258 bd->lpc_cof = ctx->lpc_cof[c];
1259 bd->quant_cof = ctx->quant_cof[c];
1260 bd->raw_samples = ctx->raw_samples[c] + offset;
1263 while (!ch[dep].stop_flag) {
1265 unsigned int begin = 1;
1266 unsigned int end = bd->block_length - 1;
1268 int32_t *master = ctx->raw_samples[ch[dep].master_channel] + offset;
1270 if (ch[dep].time_diff_flag) {
1271 int t = ch[dep].time_diff_index;
1273 if (ch[dep].time_diff_sign) {
1280 for (smp = begin; smp < end; smp++) {
1282 MUL64(ch[dep].weighting[0], master[smp - 1 ]) +
1283 MUL64(ch[dep].weighting[1], master[smp ]) +
1284 MUL64(ch[dep].weighting[2], master[smp + 1 ]) +
1285 MUL64(ch[dep].weighting[3], master[smp - 1 + t]) +
1286 MUL64(ch[dep].weighting[4], master[smp + t]) +
1287 MUL64(ch[dep].weighting[5], master[smp + 1 + t]);
1289 bd->raw_samples[smp] += y >> 7;
1292 for (smp = begin; smp < end; smp++) {
1294 MUL64(ch[dep].weighting[0], master[smp - 1]) +
1295 MUL64(ch[dep].weighting[1], master[smp ]) +
1296 MUL64(ch[dep].weighting[2], master[smp + 1]);
1298 bd->raw_samples[smp] += y >> 7;
1309 /** Read the frame data.
1311 static int read_frame_data(ALSDecContext *ctx, unsigned int ra_frame)
1313 ALSSpecificConfig *sconf = &ctx->sconf;
1314 AVCodecContext *avctx = ctx->avctx;
1315 GetBitContext *gb = &ctx->gb;
1316 unsigned int div_blocks[32]; ///< block sizes.
1318 unsigned int js_blocks[2];
1320 uint32_t bs_info = 0;
1322 // skip the size of the ra unit if present in the frame
1323 if (sconf->ra_flag == RA_FLAG_FRAMES && ra_frame)
1324 skip_bits_long(gb, 32);
1326 if (sconf->mc_coding && sconf->joint_stereo) {
1327 ctx->js_switch = get_bits1(gb);
1331 if (!sconf->mc_coding || ctx->js_switch) {
1332 int independent_bs = !sconf->joint_stereo;
1334 for (c = 0; c < avctx->channels; c++) {
1338 get_block_sizes(ctx, div_blocks, &bs_info);
1340 // if joint_stereo and block_switching is set, independent decoding
1341 // is signaled via the first bit of bs_info
1342 if (sconf->joint_stereo && sconf->block_switching)
1346 // if this is the last channel, it has to be decoded independently
1347 if (c == avctx->channels - 1)
1350 if (independent_bs) {
1351 if (decode_blocks_ind(ctx, ra_frame, c, div_blocks, js_blocks))
1356 if (decode_blocks(ctx, ra_frame, c, div_blocks, js_blocks))
1362 // store carryover raw samples
1363 memmove(ctx->raw_samples[c] - sconf->max_order,
1364 ctx->raw_samples[c] - sconf->max_order + sconf->frame_length,
1365 sizeof(*ctx->raw_samples[c]) * sconf->max_order);
1367 } else { // multi-channel coding
1368 ALSBlockData bd = { 0 };
1370 int *reverted_channels = ctx->reverted_channels;
1371 unsigned int offset = 0;
1373 for (c = 0; c < avctx->channels; c++)
1374 if (ctx->chan_data[c] < ctx->chan_data_buffer) {
1375 av_log(ctx->avctx, AV_LOG_ERROR, "Invalid channel data.\n");
1379 memset(reverted_channels, 0, sizeof(*reverted_channels) * avctx->channels);
1381 bd.ra_block = ra_frame;
1382 bd.prev_raw_samples = ctx->prev_raw_samples;
1384 get_block_sizes(ctx, div_blocks, &bs_info);
1386 for (b = 0; b < ctx->num_blocks; b++) {
1387 bd.block_length = div_blocks[b];
1389 for (c = 0; c < avctx->channels; c++) {
1390 bd.const_block = ctx->const_block + c;
1391 bd.shift_lsbs = ctx->shift_lsbs + c;
1392 bd.opt_order = ctx->opt_order + c;
1393 bd.store_prev_samples = ctx->store_prev_samples + c;
1394 bd.use_ltp = ctx->use_ltp + c;
1395 bd.ltp_lag = ctx->ltp_lag + c;
1396 bd.ltp_gain = ctx->ltp_gain[c];
1397 bd.lpc_cof = ctx->lpc_cof[c];
1398 bd.quant_cof = ctx->quant_cof[c];
1399 bd.raw_samples = ctx->raw_samples[c] + offset;
1400 bd.raw_other = NULL;
1402 if ((ret = read_block(ctx, &bd)) < 0)
1404 if ((ret = read_channel_data(ctx, ctx->chan_data[c], c)) < 0)
1408 for (c = 0; c < avctx->channels; c++)
1409 if (revert_channel_correlation(ctx, &bd, ctx->chan_data,
1410 reverted_channels, offset, c))
1413 for (c = 0; c < avctx->channels; c++) {
1414 bd.const_block = ctx->const_block + c;
1415 bd.shift_lsbs = ctx->shift_lsbs + c;
1416 bd.opt_order = ctx->opt_order + c;
1417 bd.store_prev_samples = ctx->store_prev_samples + c;
1418 bd.use_ltp = ctx->use_ltp + c;
1419 bd.ltp_lag = ctx->ltp_lag + c;
1420 bd.ltp_gain = ctx->ltp_gain[c];
1421 bd.lpc_cof = ctx->lpc_cof[c];
1422 bd.quant_cof = ctx->quant_cof[c];
1423 bd.raw_samples = ctx->raw_samples[c] + offset;
1425 if ((ret = decode_block(ctx, &bd)) < 0)
1429 memset(reverted_channels, 0, avctx->channels * sizeof(*reverted_channels));
1430 offset += div_blocks[b];
1434 // store carryover raw samples
1435 for (c = 0; c < avctx->channels; c++)
1436 memmove(ctx->raw_samples[c] - sconf->max_order,
1437 ctx->raw_samples[c] - sconf->max_order + sconf->frame_length,
1438 sizeof(*ctx->raw_samples[c]) * sconf->max_order);
1441 // TODO: read_diff_float_data
1447 /** Decode an ALS frame.
1449 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame_ptr,
1452 ALSDecContext *ctx = avctx->priv_data;
1453 ALSSpecificConfig *sconf = &ctx->sconf;
1454 const uint8_t *buffer = avpkt->data;
1455 int buffer_size = avpkt->size;
1456 int invalid_frame, ret;
1457 unsigned int c, sample, ra_frame, bytes_read, shift;
1459 init_get_bits(&ctx->gb, buffer, buffer_size * 8);
1461 // In the case that the distance between random access frames is set to zero
1462 // (sconf->ra_distance == 0) no frame is treated as a random access frame.
1463 // For the first frame, if prediction is used, all samples used from the
1464 // previous frame are assumed to be zero.
1465 ra_frame = sconf->ra_distance && !(ctx->frame_id % sconf->ra_distance);
1467 // the last frame to decode might have a different length
1468 if (sconf->samples != 0xFFFFFFFF)
1469 ctx->cur_frame_length = FFMIN(sconf->samples - ctx->frame_id * (uint64_t) sconf->frame_length,
1470 sconf->frame_length);
1472 ctx->cur_frame_length = sconf->frame_length;
1474 // decode the frame data
1475 if ((invalid_frame = read_frame_data(ctx, ra_frame)) < 0)
1476 av_log(ctx->avctx, AV_LOG_WARNING,
1477 "Reading frame data failed. Skipping RA unit.\n");
1481 /* get output buffer */
1482 ctx->frame.nb_samples = ctx->cur_frame_length;
1483 if ((ret = ff_get_buffer(avctx, &ctx->frame)) < 0) {
1484 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed.\n");
1488 // transform decoded frame into output format
1489 #define INTERLEAVE_OUTPUT(bps) \
1491 int##bps##_t *dest = (int##bps##_t*)ctx->frame.data[0]; \
1492 shift = bps - ctx->avctx->bits_per_raw_sample; \
1493 if (!ctx->cs_switch) { \
1494 for (sample = 0; sample < ctx->cur_frame_length; sample++) \
1495 for (c = 0; c < avctx->channels; c++) \
1496 *dest++ = ctx->raw_samples[c][sample] << shift; \
1498 for (sample = 0; sample < ctx->cur_frame_length; sample++) \
1499 for (c = 0; c < avctx->channels; c++) \
1500 *dest++ = ctx->raw_samples[sconf->chan_pos[c]][sample] << shift; \
1504 if (ctx->avctx->bits_per_raw_sample <= 16) {
1505 INTERLEAVE_OUTPUT(16)
1507 INTERLEAVE_OUTPUT(32)
1511 if (sconf->crc_enabled && (avctx->err_recognition & (AV_EF_CRCCHECK|AV_EF_CAREFUL))) {
1512 int swap = HAVE_BIGENDIAN != sconf->msb_first;
1514 if (ctx->avctx->bits_per_raw_sample == 24) {
1515 int32_t *src = (int32_t *)ctx->frame.data[0];
1518 sample < ctx->cur_frame_length * avctx->channels;
1523 v = av_bswap32(src[sample]);
1526 if (!HAVE_BIGENDIAN)
1529 ctx->crc = av_crc(ctx->crc_table, ctx->crc, (uint8_t*)(&v), 3);
1532 uint8_t *crc_source;
1535 if (ctx->avctx->bits_per_raw_sample <= 16) {
1536 int16_t *src = (int16_t*) ctx->frame.data[0];
1537 int16_t *dest = (int16_t*) ctx->crc_buffer;
1539 sample < ctx->cur_frame_length * avctx->channels;
1541 *dest++ = av_bswap16(src[sample]);
1543 ctx->dsp.bswap_buf((uint32_t*)ctx->crc_buffer,
1544 (uint32_t *)ctx->frame.data[0],
1545 ctx->cur_frame_length * avctx->channels);
1547 crc_source = ctx->crc_buffer;
1549 crc_source = ctx->frame.data[0];
1552 ctx->crc = av_crc(ctx->crc_table, ctx->crc, crc_source,
1553 ctx->cur_frame_length * avctx->channels *
1554 av_get_bytes_per_sample(avctx->sample_fmt));
1558 // check CRC sums if this is the last frame
1559 if (ctx->cur_frame_length != sconf->frame_length &&
1560 ctx->crc_org != ctx->crc) {
1561 av_log(avctx, AV_LOG_ERROR, "CRC error.\n");
1566 *(AVFrame *)data = ctx->frame;
1569 bytes_read = invalid_frame ? buffer_size :
1570 (get_bits_count(&ctx->gb) + 7) >> 3;
1576 /** Uninitialize the ALS decoder.
1578 static av_cold int decode_end(AVCodecContext *avctx)
1580 ALSDecContext *ctx = avctx->priv_data;
1582 av_freep(&ctx->sconf.chan_pos);
1584 ff_bgmc_end(&ctx->bgmc_lut, &ctx->bgmc_lut_status);
1586 av_freep(&ctx->const_block);
1587 av_freep(&ctx->shift_lsbs);
1588 av_freep(&ctx->opt_order);
1589 av_freep(&ctx->store_prev_samples);
1590 av_freep(&ctx->use_ltp);
1591 av_freep(&ctx->ltp_lag);
1592 av_freep(&ctx->ltp_gain);
1593 av_freep(&ctx->ltp_gain_buffer);
1594 av_freep(&ctx->quant_cof);
1595 av_freep(&ctx->lpc_cof);
1596 av_freep(&ctx->quant_cof_buffer);
1597 av_freep(&ctx->lpc_cof_buffer);
1598 av_freep(&ctx->lpc_cof_reversed_buffer);
1599 av_freep(&ctx->prev_raw_samples);
1600 av_freep(&ctx->raw_samples);
1601 av_freep(&ctx->raw_buffer);
1602 av_freep(&ctx->chan_data);
1603 av_freep(&ctx->chan_data_buffer);
1604 av_freep(&ctx->reverted_channels);
1605 av_freep(&ctx->crc_buffer);
1611 /** Initialize the ALS decoder.
1613 static av_cold int decode_init(AVCodecContext *avctx)
1616 unsigned int channel_size;
1618 ALSDecContext *ctx = avctx->priv_data;
1619 ALSSpecificConfig *sconf = &ctx->sconf;
1622 if (!avctx->extradata) {
1623 av_log(avctx, AV_LOG_ERROR, "Missing required ALS extradata.\n");
1627 if (read_specific_config(ctx)) {
1628 av_log(avctx, AV_LOG_ERROR, "Reading ALSSpecificConfig failed.\n");
1633 if (check_specific_config(ctx)) {
1639 ff_bgmc_init(avctx, &ctx->bgmc_lut, &ctx->bgmc_lut_status);
1641 if (sconf->floating) {
1642 avctx->sample_fmt = AV_SAMPLE_FMT_FLT;
1643 avctx->bits_per_raw_sample = 32;
1645 avctx->sample_fmt = sconf->resolution > 1
1646 ? AV_SAMPLE_FMT_S32 : AV_SAMPLE_FMT_S16;
1647 avctx->bits_per_raw_sample = (sconf->resolution + 1) * 8;
1650 // set maximum Rice parameter for progressive decoding based on resolution
1651 // This is not specified in 14496-3 but actually done by the reference
1652 // codec RM22 revision 2.
1653 ctx->s_max = sconf->resolution > 1 ? 31 : 15;
1655 // set lag value for long-term prediction
1656 ctx->ltp_lag_length = 8 + (avctx->sample_rate >= 96000) +
1657 (avctx->sample_rate >= 192000);
1659 // allocate quantized parcor coefficient buffer
1660 num_buffers = sconf->mc_coding ? avctx->channels : 1;
1662 ctx->quant_cof = av_malloc(sizeof(*ctx->quant_cof) * num_buffers);
1663 ctx->lpc_cof = av_malloc(sizeof(*ctx->lpc_cof) * num_buffers);
1664 ctx->quant_cof_buffer = av_malloc(sizeof(*ctx->quant_cof_buffer) *
1665 num_buffers * sconf->max_order);
1666 ctx->lpc_cof_buffer = av_malloc(sizeof(*ctx->lpc_cof_buffer) *
1667 num_buffers * sconf->max_order);
1668 ctx->lpc_cof_reversed_buffer = av_malloc(sizeof(*ctx->lpc_cof_buffer) *
1671 if (!ctx->quant_cof || !ctx->lpc_cof ||
1672 !ctx->quant_cof_buffer || !ctx->lpc_cof_buffer ||
1673 !ctx->lpc_cof_reversed_buffer) {
1674 av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
1675 return AVERROR(ENOMEM);
1678 // assign quantized parcor coefficient buffers
1679 for (c = 0; c < num_buffers; c++) {
1680 ctx->quant_cof[c] = ctx->quant_cof_buffer + c * sconf->max_order;
1681 ctx->lpc_cof[c] = ctx->lpc_cof_buffer + c * sconf->max_order;
1684 // allocate and assign lag and gain data buffer for ltp mode
1685 ctx->const_block = av_malloc (sizeof(*ctx->const_block) * num_buffers);
1686 ctx->shift_lsbs = av_malloc (sizeof(*ctx->shift_lsbs) * num_buffers);
1687 ctx->opt_order = av_malloc (sizeof(*ctx->opt_order) * num_buffers);
1688 ctx->store_prev_samples = av_malloc(sizeof(*ctx->store_prev_samples) * num_buffers);
1689 ctx->use_ltp = av_mallocz(sizeof(*ctx->use_ltp) * num_buffers);
1690 ctx->ltp_lag = av_malloc (sizeof(*ctx->ltp_lag) * num_buffers);
1691 ctx->ltp_gain = av_malloc (sizeof(*ctx->ltp_gain) * num_buffers);
1692 ctx->ltp_gain_buffer = av_malloc (sizeof(*ctx->ltp_gain_buffer) *
1695 if (!ctx->const_block || !ctx->shift_lsbs ||
1696 !ctx->opt_order || !ctx->store_prev_samples ||
1697 !ctx->use_ltp || !ctx->ltp_lag ||
1698 !ctx->ltp_gain || !ctx->ltp_gain_buffer) {
1699 av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
1701 return AVERROR(ENOMEM);
1704 for (c = 0; c < num_buffers; c++)
1705 ctx->ltp_gain[c] = ctx->ltp_gain_buffer + c * 5;
1707 // allocate and assign channel data buffer for mcc mode
1708 if (sconf->mc_coding) {
1709 ctx->chan_data_buffer = av_malloc(sizeof(*ctx->chan_data_buffer) *
1710 num_buffers * num_buffers);
1711 ctx->chan_data = av_malloc(sizeof(*ctx->chan_data) *
1713 ctx->reverted_channels = av_malloc(sizeof(*ctx->reverted_channels) *
1716 if (!ctx->chan_data_buffer || !ctx->chan_data || !ctx->reverted_channels) {
1717 av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
1719 return AVERROR(ENOMEM);
1722 for (c = 0; c < num_buffers; c++)
1723 ctx->chan_data[c] = ctx->chan_data_buffer + c * num_buffers;
1725 ctx->chan_data = NULL;
1726 ctx->chan_data_buffer = NULL;
1727 ctx->reverted_channels = NULL;
1730 channel_size = sconf->frame_length + sconf->max_order;
1732 ctx->prev_raw_samples = av_malloc (sizeof(*ctx->prev_raw_samples) * sconf->max_order);
1733 ctx->raw_buffer = av_mallocz(sizeof(*ctx-> raw_buffer) * avctx->channels * channel_size);
1734 ctx->raw_samples = av_malloc (sizeof(*ctx-> raw_samples) * avctx->channels);
1736 // allocate previous raw sample buffer
1737 if (!ctx->prev_raw_samples || !ctx->raw_buffer|| !ctx->raw_samples) {
1738 av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
1740 return AVERROR(ENOMEM);
1743 // assign raw samples buffers
1744 ctx->raw_samples[0] = ctx->raw_buffer + sconf->max_order;
1745 for (c = 1; c < avctx->channels; c++)
1746 ctx->raw_samples[c] = ctx->raw_samples[c - 1] + channel_size;
1748 // allocate crc buffer
1749 if (HAVE_BIGENDIAN != sconf->msb_first && sconf->crc_enabled &&
1750 (avctx->err_recognition & (AV_EF_CRCCHECK|AV_EF_CAREFUL))) {
1751 ctx->crc_buffer = av_malloc(sizeof(*ctx->crc_buffer) *
1752 ctx->cur_frame_length *
1754 av_get_bytes_per_sample(avctx->sample_fmt));
1755 if (!ctx->crc_buffer) {
1756 av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
1758 return AVERROR(ENOMEM);
1762 ff_dsputil_init(&ctx->dsp, avctx);
1764 avcodec_get_frame_defaults(&ctx->frame);
1765 avctx->coded_frame = &ctx->frame;
1771 /** Flush (reset) the frame ID after seeking.
1773 static av_cold void flush(AVCodecContext *avctx)
1775 ALSDecContext *ctx = avctx->priv_data;
1781 AVCodec ff_als_decoder = {
1783 .type = AVMEDIA_TYPE_AUDIO,
1784 .id = AV_CODEC_ID_MP4ALS,
1785 .priv_data_size = sizeof(ALSDecContext),
1786 .init = decode_init,
1787 .close = decode_end,
1788 .decode = decode_frame,
1790 .capabilities = CODEC_CAP_SUBFRAMES | CODEC_CAP_DR1,
1791 .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 Audio Lossless Coding (ALS)"),