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;
195 ALSSpecificConfig sconf;
198 const AVCRC *crc_table;
199 uint32_t crc_org; ///< CRC value of the original input data
200 uint32_t crc; ///< CRC value calculated from decoded data
201 unsigned int cur_frame_length; ///< length of the current frame to decode
202 unsigned int frame_id; ///< the frame ID / number of the current frame
203 unsigned int js_switch; ///< if true, joint-stereo decoding is enforced
204 unsigned int cs_switch; ///< if true, channel rearrangement is done
205 unsigned int num_blocks; ///< number of blocks used in the current frame
206 unsigned int s_max; ///< maximum Rice parameter allowed in entropy coding
207 uint8_t *bgmc_lut; ///< pointer at lookup tables used for BGMC
208 int *bgmc_lut_status; ///< pointer at lookup table status flags used for BGMC
209 int ltp_lag_length; ///< number of bits used for ltp lag value
210 int *const_block; ///< contains const_block flags for all channels
211 unsigned int *shift_lsbs; ///< contains shift_lsbs flags for all channels
212 unsigned int *opt_order; ///< contains opt_order flags for all channels
213 int *store_prev_samples; ///< contains store_prev_samples flags for all channels
214 int *use_ltp; ///< contains use_ltp flags for all channels
215 int *ltp_lag; ///< contains ltp lag values for all channels
216 int **ltp_gain; ///< gain values for ltp 5-tap filter for a channel
217 int *ltp_gain_buffer; ///< contains all gain values for ltp 5-tap filter
218 int32_t **quant_cof; ///< quantized parcor coefficients for a channel
219 int32_t *quant_cof_buffer; ///< contains all quantized parcor coefficients
220 int32_t **lpc_cof; ///< coefficients of the direct form prediction filter for a channel
221 int32_t *lpc_cof_buffer; ///< contains all coefficients of the direct form prediction filter
222 int32_t *lpc_cof_reversed_buffer; ///< temporary buffer to set up a reversed versio of lpc_cof_buffer
223 ALSChannelData **chan_data; ///< channel data for multi-channel correlation
224 ALSChannelData *chan_data_buffer; ///< contains channel data for all channels
225 int *reverted_channels; ///< stores a flag for each reverted channel
226 int32_t *prev_raw_samples; ///< contains unshifted raw samples from the previous block
227 int32_t **raw_samples; ///< decoded raw samples for each channel
228 int32_t *raw_buffer; ///< contains all decoded raw samples including carryover samples
229 uint8_t *crc_buffer; ///< buffer of byte order corrected samples used for CRC check
234 unsigned int block_length; ///< number of samples within the block
235 unsigned int ra_block; ///< if true, this is a random access block
236 int *const_block; ///< if true, this is a constant value block
237 int js_blocks; ///< true if this block contains a difference signal
238 unsigned int *shift_lsbs; ///< shift of values for this block
239 unsigned int *opt_order; ///< prediction order of this block
240 int *store_prev_samples;///< if true, carryover samples have to be stored
241 int *use_ltp; ///< if true, long-term prediction is used
242 int *ltp_lag; ///< lag value for long-term prediction
243 int *ltp_gain; ///< gain values for ltp 5-tap filter
244 int32_t *quant_cof; ///< quantized parcor coefficients
245 int32_t *lpc_cof; ///< coefficients of the direct form prediction
246 int32_t *raw_samples; ///< decoded raw samples / residuals for this block
247 int32_t *prev_raw_samples; ///< contains unshifted raw samples from the previous block
248 int32_t *raw_other; ///< decoded raw samples of the other channel of a channel pair
252 static av_cold void dprint_specific_config(ALSDecContext *ctx)
255 AVCodecContext *avctx = ctx->avctx;
256 ALSSpecificConfig *sconf = &ctx->sconf;
258 av_dlog(avctx, "resolution = %i\n", sconf->resolution);
259 av_dlog(avctx, "floating = %i\n", sconf->floating);
260 av_dlog(avctx, "frame_length = %i\n", sconf->frame_length);
261 av_dlog(avctx, "ra_distance = %i\n", sconf->ra_distance);
262 av_dlog(avctx, "ra_flag = %i\n", sconf->ra_flag);
263 av_dlog(avctx, "adapt_order = %i\n", sconf->adapt_order);
264 av_dlog(avctx, "coef_table = %i\n", sconf->coef_table);
265 av_dlog(avctx, "long_term_prediction = %i\n", sconf->long_term_prediction);
266 av_dlog(avctx, "max_order = %i\n", sconf->max_order);
267 av_dlog(avctx, "block_switching = %i\n", sconf->block_switching);
268 av_dlog(avctx, "bgmc = %i\n", sconf->bgmc);
269 av_dlog(avctx, "sb_part = %i\n", sconf->sb_part);
270 av_dlog(avctx, "joint_stereo = %i\n", sconf->joint_stereo);
271 av_dlog(avctx, "mc_coding = %i\n", sconf->mc_coding);
272 av_dlog(avctx, "chan_config = %i\n", sconf->chan_config);
273 av_dlog(avctx, "chan_sort = %i\n", sconf->chan_sort);
274 av_dlog(avctx, "RLSLMS = %i\n", sconf->rlslms);
275 av_dlog(avctx, "chan_config_info = %i\n", sconf->chan_config_info);
280 /** Read an ALSSpecificConfig from a buffer into the output struct.
282 static av_cold int read_specific_config(ALSDecContext *ctx)
286 int i, config_offset;
287 MPEG4AudioConfig m4ac;
288 ALSSpecificConfig *sconf = &ctx->sconf;
289 AVCodecContext *avctx = ctx->avctx;
290 uint32_t als_id, header_size, trailer_size;
293 if ((ret = init_get_bits8(&gb, avctx->extradata, avctx->extradata_size)) < 0)
296 config_offset = avpriv_mpeg4audio_get_config(&m4ac, avctx->extradata,
297 avctx->extradata_size * 8, 1);
299 if (config_offset < 0)
302 skip_bits_long(&gb, config_offset);
304 if (get_bits_left(&gb) < (30 << 3))
307 // read the fixed items
308 als_id = get_bits_long(&gb, 32);
309 avctx->sample_rate = m4ac.sample_rate;
310 skip_bits_long(&gb, 32); // sample rate already known
311 sconf->samples = get_bits_long(&gb, 32);
312 avctx->channels = m4ac.channels;
313 skip_bits(&gb, 16); // number of channels already known
314 skip_bits(&gb, 3); // skip file_type
315 sconf->resolution = get_bits(&gb, 3);
316 sconf->floating = get_bits1(&gb);
317 sconf->msb_first = get_bits1(&gb);
318 sconf->frame_length = get_bits(&gb, 16) + 1;
319 sconf->ra_distance = get_bits(&gb, 8);
320 sconf->ra_flag = get_bits(&gb, 2);
321 sconf->adapt_order = get_bits1(&gb);
322 sconf->coef_table = get_bits(&gb, 2);
323 sconf->long_term_prediction = get_bits1(&gb);
324 sconf->max_order = get_bits(&gb, 10);
325 sconf->block_switching = get_bits(&gb, 2);
326 sconf->bgmc = get_bits1(&gb);
327 sconf->sb_part = get_bits1(&gb);
328 sconf->joint_stereo = get_bits1(&gb);
329 sconf->mc_coding = get_bits1(&gb);
330 sconf->chan_config = get_bits1(&gb);
331 sconf->chan_sort = get_bits1(&gb);
332 sconf->crc_enabled = get_bits1(&gb);
333 sconf->rlslms = get_bits1(&gb);
334 skip_bits(&gb, 5); // skip 5 reserved bits
335 skip_bits1(&gb); // skip aux_data_enabled
338 // check for ALSSpecificConfig struct
339 if (als_id != MKBETAG('A','L','S','\0'))
342 ctx->cur_frame_length = sconf->frame_length;
344 // read channel config
345 if (sconf->chan_config)
346 sconf->chan_config_info = get_bits(&gb, 16);
347 // TODO: use this to set avctx->channel_layout
350 // read channel sorting
351 if (sconf->chan_sort && avctx->channels > 1) {
352 int chan_pos_bits = av_ceil_log2(avctx->channels);
353 int bits_needed = avctx->channels * chan_pos_bits + 7;
354 if (get_bits_left(&gb) < bits_needed)
357 if (!(sconf->chan_pos = av_malloc(avctx->channels * sizeof(*sconf->chan_pos))))
358 return AVERROR(ENOMEM);
362 for (i = 0; i < avctx->channels; i++) {
365 idx = get_bits(&gb, chan_pos_bits);
366 if (idx >= avctx->channels) {
367 av_log(avctx, AV_LOG_WARNING, "Invalid channel reordering.\n");
371 sconf->chan_pos[idx] = i;
378 // read fixed header and trailer sizes,
379 // if size = 0xFFFFFFFF then there is no data field!
380 if (get_bits_left(&gb) < 64)
383 header_size = get_bits_long(&gb, 32);
384 trailer_size = get_bits_long(&gb, 32);
385 if (header_size == 0xFFFFFFFF)
387 if (trailer_size == 0xFFFFFFFF)
390 ht_size = ((int64_t)(header_size) + (int64_t)(trailer_size)) << 3;
393 // skip the header and trailer data
394 if (get_bits_left(&gb) < ht_size)
397 if (ht_size > INT32_MAX)
400 skip_bits_long(&gb, ht_size);
403 // initialize CRC calculation
404 if (sconf->crc_enabled) {
405 if (get_bits_left(&gb) < 32)
408 if (avctx->err_recognition & (AV_EF_CRCCHECK|AV_EF_CAREFUL)) {
409 ctx->crc_table = av_crc_get_table(AV_CRC_32_IEEE_LE);
410 ctx->crc = 0xFFFFFFFF;
411 ctx->crc_org = ~get_bits_long(&gb, 32);
413 skip_bits_long(&gb, 32);
417 // no need to read the rest of ALSSpecificConfig (ra_unit_size & aux data)
419 dprint_specific_config(ctx);
425 /** Check the ALSSpecificConfig for unsupported features.
427 static int check_specific_config(ALSDecContext *ctx)
429 ALSSpecificConfig *sconf = &ctx->sconf;
432 // report unsupported feature and set error value
433 #define MISSING_ERR(cond, str, errval) \
436 av_log_missing_feature(ctx->avctx, str, 0); \
441 MISSING_ERR(sconf->floating, "Floating point decoding", AVERROR_PATCHWELCOME);
442 MISSING_ERR(sconf->rlslms, "Adaptive RLS-LMS prediction", AVERROR_PATCHWELCOME);
448 /** Parse the bs_info field to extract the block partitioning used in
449 * block switching mode, refer to ISO/IEC 14496-3, section 11.6.2.
451 static void parse_bs_info(const uint32_t bs_info, unsigned int n,
452 unsigned int div, unsigned int **div_blocks,
453 unsigned int *num_blocks)
455 if (n < 31 && ((bs_info << n) & 0x40000000)) {
456 // if the level is valid and the investigated bit n is set
457 // then recursively check both children at bits (2n+1) and (2n+2)
460 parse_bs_info(bs_info, n + 1, div, div_blocks, num_blocks);
461 parse_bs_info(bs_info, n + 2, div, div_blocks, num_blocks);
463 // else the bit is not set or the last level has been reached
464 // (bit implicitly not set)
472 /** Read and decode a Rice codeword.
474 static int32_t decode_rice(GetBitContext *gb, unsigned int k)
476 int max = get_bits_left(gb) - k;
477 int q = get_unary(gb, 0, max);
478 int r = k ? get_bits1(gb) : !(q & 1);
482 q += get_bits_long(gb, k - 1);
490 /** Convert PARCOR coefficient k to direct filter coefficient.
492 static void parcor_to_lpc(unsigned int k, const int32_t *par, int32_t *cof)
496 for (i = 0, j = k - 1; i < j; i++, j--) {
497 int tmp1 = ((MUL64(par[k], cof[j]) + (1 << 19)) >> 20);
498 cof[j] += ((MUL64(par[k], cof[i]) + (1 << 19)) >> 20);
502 cof[i] += ((MUL64(par[k], cof[j]) + (1 << 19)) >> 20);
508 /** Read block switching field if necessary and set actual block sizes.
509 * Also assure that the block sizes of the last frame correspond to the
510 * actual number of samples.
512 static void get_block_sizes(ALSDecContext *ctx, unsigned int *div_blocks,
515 ALSSpecificConfig *sconf = &ctx->sconf;
516 GetBitContext *gb = &ctx->gb;
517 unsigned int *ptr_div_blocks = div_blocks;
520 if (sconf->block_switching) {
521 unsigned int bs_info_len = 1 << (sconf->block_switching + 2);
522 *bs_info = get_bits_long(gb, bs_info_len);
523 *bs_info <<= (32 - bs_info_len);
527 parse_bs_info(*bs_info, 0, 0, &ptr_div_blocks, &ctx->num_blocks);
529 // The last frame may have an overdetermined block structure given in
530 // the bitstream. In that case the defined block structure would need
531 // more samples than available to be consistent.
532 // The block structure is actually used but the block sizes are adapted
533 // to fit the actual number of available samples.
534 // Example: 5 samples, 2nd level block sizes: 2 2 2 2.
535 // This results in the actual block sizes: 2 2 1 0.
536 // This is not specified in 14496-3 but actually done by the reference
537 // codec RM22 revision 2.
538 // This appears to happen in case of an odd number of samples in the last
539 // frame which is actually not allowed by the block length switching part
541 // The ALS conformance files feature an odd number of samples in the last
544 for (b = 0; b < ctx->num_blocks; b++)
545 div_blocks[b] = ctx->sconf.frame_length >> div_blocks[b];
547 if (ctx->cur_frame_length != ctx->sconf.frame_length) {
548 unsigned int remaining = ctx->cur_frame_length;
550 for (b = 0; b < ctx->num_blocks; b++) {
551 if (remaining <= div_blocks[b]) {
552 div_blocks[b] = remaining;
553 ctx->num_blocks = b + 1;
557 remaining -= div_blocks[b];
563 /** Read the block data for a constant block
565 static int read_const_block_data(ALSDecContext *ctx, ALSBlockData *bd)
567 ALSSpecificConfig *sconf = &ctx->sconf;
568 AVCodecContext *avctx = ctx->avctx;
569 GetBitContext *gb = &ctx->gb;
571 if (bd->block_length <= 0)
572 return AVERROR_INVALIDDATA;
574 *bd->raw_samples = 0;
575 *bd->const_block = get_bits1(gb); // 1 = constant value, 0 = zero block (silence)
576 bd->js_blocks = get_bits1(gb);
578 // skip 5 reserved bits
581 if (*bd->const_block) {
582 unsigned int const_val_bits = sconf->floating ? 24 : avctx->bits_per_raw_sample;
583 *bd->raw_samples = get_sbits_long(gb, const_val_bits);
586 // ensure constant block decoding by reusing this field
587 *bd->const_block = 1;
593 /** Decode the block data for a constant block
595 static void decode_const_block_data(ALSDecContext *ctx, ALSBlockData *bd)
597 int smp = bd->block_length - 1;
598 int32_t val = *bd->raw_samples;
599 int32_t *dst = bd->raw_samples + 1;
601 // write raw samples into buffer
607 /** Read the block data for a non-constant block
609 static int read_var_block_data(ALSDecContext *ctx, ALSBlockData *bd)
611 ALSSpecificConfig *sconf = &ctx->sconf;
612 AVCodecContext *avctx = ctx->avctx;
613 GetBitContext *gb = &ctx->gb;
617 unsigned int sub_blocks, log2_sub_blocks, sb_length;
618 unsigned int start = 0;
619 unsigned int opt_order;
621 int32_t *quant_cof = bd->quant_cof;
622 int32_t *current_res;
625 // ensure variable block decoding by reusing this field
626 *bd->const_block = 0;
629 bd->js_blocks = get_bits1(gb);
631 opt_order = *bd->opt_order;
633 // determine the number of subblocks for entropy decoding
634 if (!sconf->bgmc && !sconf->sb_part) {
637 if (sconf->bgmc && sconf->sb_part)
638 log2_sub_blocks = get_bits(gb, 2);
640 log2_sub_blocks = 2 * get_bits1(gb);
643 sub_blocks = 1 << log2_sub_blocks;
645 // do not continue in case of a damaged stream since
646 // block_length must be evenly divisible by sub_blocks
647 if (bd->block_length & (sub_blocks - 1)) {
648 av_log(avctx, AV_LOG_WARNING,
649 "Block length is not evenly divisible by the number of subblocks.\n");
653 sb_length = bd->block_length >> log2_sub_blocks;
656 s[0] = get_bits(gb, 8 + (sconf->resolution > 1));
657 for (k = 1; k < sub_blocks; k++)
658 s[k] = s[k - 1] + decode_rice(gb, 2);
660 for (k = 0; k < sub_blocks; k++) {
665 s[0] = get_bits(gb, 4 + (sconf->resolution > 1));
666 for (k = 1; k < sub_blocks; k++)
667 s[k] = s[k - 1] + decode_rice(gb, 0);
669 for (k = 1; k < sub_blocks; k++)
671 av_log(avctx, AV_LOG_ERROR, "k invalid for rice code.\n");
672 return AVERROR_INVALIDDATA;
676 *bd->shift_lsbs = get_bits(gb, 4) + 1;
678 *bd->store_prev_samples = (bd->js_blocks && bd->raw_other) || *bd->shift_lsbs;
681 if (!sconf->rlslms) {
682 if (sconf->adapt_order) {
683 int opt_order_length = av_ceil_log2(av_clip((bd->block_length >> 3) - 1,
684 2, sconf->max_order + 1));
685 *bd->opt_order = get_bits(gb, opt_order_length);
686 if (*bd->opt_order > sconf->max_order) {
687 *bd->opt_order = sconf->max_order;
688 av_log(avctx, AV_LOG_ERROR, "Predictor order too large.\n");
689 return AVERROR_INVALIDDATA;
692 *bd->opt_order = sconf->max_order;
695 opt_order = *bd->opt_order;
700 if (sconf->coef_table == 3) {
703 // read coefficient 0
704 quant_cof[0] = 32 * parcor_scaled_values[get_bits(gb, 7)];
706 // read coefficient 1
708 quant_cof[1] = -32 * parcor_scaled_values[get_bits(gb, 7)];
710 // read coefficients 2 to opt_order
711 for (k = 2; k < opt_order; k++)
712 quant_cof[k] = get_bits(gb, 7);
717 // read coefficient 0 to 19
718 k_max = FFMIN(opt_order, 20);
719 for (k = 0; k < k_max; k++) {
720 int rice_param = parcor_rice_table[sconf->coef_table][k][1];
721 int offset = parcor_rice_table[sconf->coef_table][k][0];
722 quant_cof[k] = decode_rice(gb, rice_param) + offset;
723 if (quant_cof[k] < -64 || quant_cof[k] > 63) {
724 av_log(avctx, AV_LOG_ERROR, "quant_cof %d is out of range.\n", quant_cof[k]);
725 return AVERROR_INVALIDDATA;
729 // read coefficients 20 to 126
730 k_max = FFMIN(opt_order, 127);
731 for (; k < k_max; k++)
732 quant_cof[k] = decode_rice(gb, 2) + (k & 1);
734 // read coefficients 127 to opt_order
735 for (; k < opt_order; k++)
736 quant_cof[k] = decode_rice(gb, 1);
738 quant_cof[0] = 32 * parcor_scaled_values[quant_cof[0] + 64];
741 quant_cof[1] = -32 * parcor_scaled_values[quant_cof[1] + 64];
744 for (k = 2; k < opt_order; k++)
745 quant_cof[k] = (quant_cof[k] << 14) + (add_base << 13);
749 // read LTP gain and lag values
750 if (sconf->long_term_prediction) {
751 *bd->use_ltp = get_bits1(gb);
756 bd->ltp_gain[0] = decode_rice(gb, 1) << 3;
757 bd->ltp_gain[1] = decode_rice(gb, 2) << 3;
759 r = get_unary(gb, 0, 3);
761 bd->ltp_gain[2] = ltp_gain_values[r][c];
763 bd->ltp_gain[3] = decode_rice(gb, 2) << 3;
764 bd->ltp_gain[4] = decode_rice(gb, 1) << 3;
766 *bd->ltp_lag = get_bits(gb, ctx->ltp_lag_length);
767 *bd->ltp_lag += FFMAX(4, opt_order + 1);
771 // read first value and residuals in case of a random access block
774 bd->raw_samples[0] = decode_rice(gb, avctx->bits_per_raw_sample - 4);
776 bd->raw_samples[1] = decode_rice(gb, FFMIN(s[0] + 3, ctx->s_max));
778 bd->raw_samples[2] = decode_rice(gb, FFMIN(s[0] + 1, ctx->s_max));
780 start = FFMIN(opt_order, 3);
783 // read all residuals
787 unsigned int b = av_clip((av_ceil_log2(bd->block_length) - 3) >> 1, 0, 5);
789 // read most significant bits
794 ff_bgmc_decode_init(gb, &high, &low, &value);
796 current_res = bd->raw_samples + start;
798 for (sb = 0; sb < sub_blocks; sb++) {
799 unsigned int sb_len = sb_length - (sb ? 0 : start);
801 k [sb] = s[sb] > b ? s[sb] - b : 0;
802 delta[sb] = 5 - s[sb] + k[sb];
804 ff_bgmc_decode(gb, sb_len, current_res,
805 delta[sb], sx[sb], &high, &low, &value, ctx->bgmc_lut, ctx->bgmc_lut_status);
807 current_res += sb_len;
810 ff_bgmc_decode_end(gb);
813 // read least significant bits and tails
814 current_res = bd->raw_samples + start;
816 for (sb = 0; sb < sub_blocks; sb++, start = 0) {
817 unsigned int cur_tail_code = tail_code[sx[sb]][delta[sb]];
818 unsigned int cur_k = k[sb];
819 unsigned int cur_s = s[sb];
821 for (; start < sb_length; start++) {
822 int32_t res = *current_res;
824 if (res == cur_tail_code) {
825 unsigned int max_msb = (2 + (sx[sb] > 2) + (sx[sb] > 10))
828 res = decode_rice(gb, cur_s);
831 res += (max_msb ) << cur_k;
833 res -= (max_msb - 1) << cur_k;
836 if (res > cur_tail_code)
846 res |= get_bits_long(gb, cur_k);
850 *current_res++ = res;
854 current_res = bd->raw_samples + start;
856 for (sb = 0; sb < sub_blocks; sb++, start = 0)
857 for (; start < sb_length; start++)
858 *current_res++ = decode_rice(gb, s[sb]);
861 if (!sconf->mc_coding || ctx->js_switch)
868 /** Decode the block data for a non-constant block
870 static int decode_var_block_data(ALSDecContext *ctx, ALSBlockData *bd)
872 ALSSpecificConfig *sconf = &ctx->sconf;
873 unsigned int block_length = bd->block_length;
874 unsigned int smp = 0;
876 int opt_order = *bd->opt_order;
879 int32_t *quant_cof = bd->quant_cof;
880 int32_t *lpc_cof = bd->lpc_cof;
881 int32_t *raw_samples = bd->raw_samples;
882 int32_t *raw_samples_end = bd->raw_samples + bd->block_length;
883 int32_t *lpc_cof_reversed = ctx->lpc_cof_reversed_buffer;
885 // reverse long-term prediction
889 for (ltp_smp = FFMAX(*bd->ltp_lag - 2, 0); ltp_smp < block_length; ltp_smp++) {
890 int center = ltp_smp - *bd->ltp_lag;
891 int begin = FFMAX(0, center - 2);
892 int end = center + 3;
893 int tab = 5 - (end - begin);
898 for (base = begin; base < end; base++, tab++)
899 y += MUL64(bd->ltp_gain[tab], raw_samples[base]);
901 raw_samples[ltp_smp] += y >> 7;
905 // reconstruct all samples from residuals
907 for (smp = 0; smp < opt_order; smp++) {
910 for (sb = 0; sb < smp; sb++)
911 y += MUL64(lpc_cof[sb], raw_samples[-(sb + 1)]);
913 *raw_samples++ -= y >> 20;
914 parcor_to_lpc(smp, quant_cof, lpc_cof);
917 for (k = 0; k < opt_order; k++)
918 parcor_to_lpc(k, quant_cof, lpc_cof);
920 // store previous samples in case that they have to be altered
921 if (*bd->store_prev_samples)
922 memcpy(bd->prev_raw_samples, raw_samples - sconf->max_order,
923 sizeof(*bd->prev_raw_samples) * sconf->max_order);
925 // reconstruct difference signal for prediction (joint-stereo)
926 if (bd->js_blocks && bd->raw_other) {
927 int32_t *left, *right;
929 if (bd->raw_other > raw_samples) { // D = R - L
931 right = bd->raw_other;
932 } else { // D = R - L
933 left = bd->raw_other;
937 for (sb = -1; sb >= -sconf->max_order; sb--)
938 raw_samples[sb] = right[sb] - left[sb];
941 // reconstruct shifted signal
943 for (sb = -1; sb >= -sconf->max_order; sb--)
944 raw_samples[sb] >>= *bd->shift_lsbs;
947 // reverse linear prediction coefficients for efficiency
948 lpc_cof = lpc_cof + opt_order;
950 for (sb = 0; sb < opt_order; sb++)
951 lpc_cof_reversed[sb] = lpc_cof[-(sb + 1)];
953 // reconstruct raw samples
954 raw_samples = bd->raw_samples + smp;
955 lpc_cof = lpc_cof_reversed + opt_order;
957 for (; raw_samples < raw_samples_end; raw_samples++) {
960 for (sb = -opt_order; sb < 0; sb++)
961 y += MUL64(lpc_cof[sb], raw_samples[sb]);
963 *raw_samples -= y >> 20;
966 raw_samples = bd->raw_samples;
968 // restore previous samples in case that they have been altered
969 if (*bd->store_prev_samples)
970 memcpy(raw_samples - sconf->max_order, bd->prev_raw_samples,
971 sizeof(*raw_samples) * sconf->max_order);
977 /** Read the block data.
979 static int read_block(ALSDecContext *ctx, ALSBlockData *bd)
981 GetBitContext *gb = &ctx->gb;
985 // read block type flag and read the samples accordingly
987 if ((ret = read_var_block_data(ctx, bd)) < 0)
990 if ((ret = read_const_block_data(ctx, bd)) < 0)
998 /** Decode the block data.
1000 static int decode_block(ALSDecContext *ctx, ALSBlockData *bd)
1004 // read block type flag and read the samples accordingly
1005 if (*bd->const_block)
1006 decode_const_block_data(ctx, bd);
1007 else if (decode_var_block_data(ctx, bd))
1010 // TODO: read RLSLMS extension data
1012 if (*bd->shift_lsbs)
1013 for (smp = 0; smp < bd->block_length; smp++)
1014 bd->raw_samples[smp] <<= *bd->shift_lsbs;
1020 /** Read and decode block data successively.
1022 static int read_decode_block(ALSDecContext *ctx, ALSBlockData *bd)
1026 ret = read_block(ctx, bd);
1031 ret = decode_block(ctx, bd);
1037 /** Compute the number of samples left to decode for the current frame and
1038 * sets these samples to zero.
1040 static void zero_remaining(unsigned int b, unsigned int b_max,
1041 const unsigned int *div_blocks, int32_t *buf)
1043 unsigned int count = 0;
1046 count += div_blocks[b++];
1049 memset(buf, 0, sizeof(*buf) * count);
1053 /** Decode blocks independently.
1055 static int decode_blocks_ind(ALSDecContext *ctx, unsigned int ra_frame,
1056 unsigned int c, const unsigned int *div_blocks,
1057 unsigned int *js_blocks)
1060 ALSBlockData bd = { 0 };
1062 bd.ra_block = ra_frame;
1063 bd.const_block = ctx->const_block;
1064 bd.shift_lsbs = ctx->shift_lsbs;
1065 bd.opt_order = ctx->opt_order;
1066 bd.store_prev_samples = ctx->store_prev_samples;
1067 bd.use_ltp = ctx->use_ltp;
1068 bd.ltp_lag = ctx->ltp_lag;
1069 bd.ltp_gain = ctx->ltp_gain[0];
1070 bd.quant_cof = ctx->quant_cof[0];
1071 bd.lpc_cof = ctx->lpc_cof[0];
1072 bd.prev_raw_samples = ctx->prev_raw_samples;
1073 bd.raw_samples = ctx->raw_samples[c];
1076 for (b = 0; b < ctx->num_blocks; b++) {
1077 bd.block_length = div_blocks[b];
1079 if (read_decode_block(ctx, &bd)) {
1080 // damaged block, write zero for the rest of the frame
1081 zero_remaining(b, ctx->num_blocks, div_blocks, bd.raw_samples);
1084 bd.raw_samples += div_blocks[b];
1092 /** Decode blocks dependently.
1094 static int decode_blocks(ALSDecContext *ctx, unsigned int ra_frame,
1095 unsigned int c, const unsigned int *div_blocks,
1096 unsigned int *js_blocks)
1098 ALSSpecificConfig *sconf = &ctx->sconf;
1099 unsigned int offset = 0;
1101 ALSBlockData bd[2] = { { 0 } };
1103 bd[0].ra_block = ra_frame;
1104 bd[0].const_block = ctx->const_block;
1105 bd[0].shift_lsbs = ctx->shift_lsbs;
1106 bd[0].opt_order = ctx->opt_order;
1107 bd[0].store_prev_samples = ctx->store_prev_samples;
1108 bd[0].use_ltp = ctx->use_ltp;
1109 bd[0].ltp_lag = ctx->ltp_lag;
1110 bd[0].ltp_gain = ctx->ltp_gain[0];
1111 bd[0].quant_cof = ctx->quant_cof[0];
1112 bd[0].lpc_cof = ctx->lpc_cof[0];
1113 bd[0].prev_raw_samples = ctx->prev_raw_samples;
1114 bd[0].js_blocks = *js_blocks;
1116 bd[1].ra_block = ra_frame;
1117 bd[1].const_block = ctx->const_block;
1118 bd[1].shift_lsbs = ctx->shift_lsbs;
1119 bd[1].opt_order = ctx->opt_order;
1120 bd[1].store_prev_samples = ctx->store_prev_samples;
1121 bd[1].use_ltp = ctx->use_ltp;
1122 bd[1].ltp_lag = ctx->ltp_lag;
1123 bd[1].ltp_gain = ctx->ltp_gain[0];
1124 bd[1].quant_cof = ctx->quant_cof[0];
1125 bd[1].lpc_cof = ctx->lpc_cof[0];
1126 bd[1].prev_raw_samples = ctx->prev_raw_samples;
1127 bd[1].js_blocks = *(js_blocks + 1);
1129 // decode all blocks
1130 for (b = 0; b < ctx->num_blocks; b++) {
1133 bd[0].block_length = div_blocks[b];
1134 bd[1].block_length = div_blocks[b];
1136 bd[0].raw_samples = ctx->raw_samples[c ] + offset;
1137 bd[1].raw_samples = ctx->raw_samples[c + 1] + offset;
1139 bd[0].raw_other = bd[1].raw_samples;
1140 bd[1].raw_other = bd[0].raw_samples;
1142 if(read_decode_block(ctx, &bd[0]) || read_decode_block(ctx, &bd[1])) {
1143 // damaged block, write zero for the rest of the frame
1144 zero_remaining(b, ctx->num_blocks, div_blocks, bd[0].raw_samples);
1145 zero_remaining(b, ctx->num_blocks, div_blocks, bd[1].raw_samples);
1149 // reconstruct joint-stereo blocks
1150 if (bd[0].js_blocks) {
1151 if (bd[1].js_blocks)
1152 av_log(ctx->avctx, AV_LOG_WARNING, "Invalid channel pair.\n");
1154 for (s = 0; s < div_blocks[b]; s++)
1155 bd[0].raw_samples[s] = bd[1].raw_samples[s] - bd[0].raw_samples[s];
1156 } else if (bd[1].js_blocks) {
1157 for (s = 0; s < div_blocks[b]; s++)
1158 bd[1].raw_samples[s] = bd[1].raw_samples[s] + bd[0].raw_samples[s];
1161 offset += div_blocks[b];
1166 // store carryover raw samples,
1167 // the others channel raw samples are stored by the calling function.
1168 memmove(ctx->raw_samples[c] - sconf->max_order,
1169 ctx->raw_samples[c] - sconf->max_order + sconf->frame_length,
1170 sizeof(*ctx->raw_samples[c]) * sconf->max_order);
1176 /** Read the channel data.
1178 static int read_channel_data(ALSDecContext *ctx, ALSChannelData *cd, int c)
1180 GetBitContext *gb = &ctx->gb;
1181 ALSChannelData *current = cd;
1182 unsigned int channels = ctx->avctx->channels;
1185 while (entries < channels && !(current->stop_flag = get_bits1(gb))) {
1186 current->master_channel = get_bits_long(gb, av_ceil_log2(channels));
1188 if (current->master_channel >= channels) {
1189 av_log(ctx->avctx, AV_LOG_ERROR, "Invalid master channel.\n");
1193 if (current->master_channel != c) {
1194 current->time_diff_flag = get_bits1(gb);
1195 current->weighting[0] = mcc_weightings[av_clip(decode_rice(gb, 1) + 16, 0, 31)];
1196 current->weighting[1] = mcc_weightings[av_clip(decode_rice(gb, 2) + 14, 0, 31)];
1197 current->weighting[2] = mcc_weightings[av_clip(decode_rice(gb, 1) + 16, 0, 31)];
1199 if (current->time_diff_flag) {
1200 current->weighting[3] = mcc_weightings[av_clip(decode_rice(gb, 1) + 16, 0, 31)];
1201 current->weighting[4] = mcc_weightings[av_clip(decode_rice(gb, 1) + 16, 0, 31)];
1202 current->weighting[5] = mcc_weightings[av_clip(decode_rice(gb, 1) + 16, 0, 31)];
1204 current->time_diff_sign = get_bits1(gb);
1205 current->time_diff_index = get_bits(gb, ctx->ltp_lag_length - 3) + 3;
1213 if (entries == channels) {
1214 av_log(ctx->avctx, AV_LOG_ERROR, "Damaged channel data.\n");
1223 /** Recursively reverts the inter-channel correlation for a block.
1225 static int revert_channel_correlation(ALSDecContext *ctx, ALSBlockData *bd,
1226 ALSChannelData **cd, int *reverted,
1227 unsigned int offset, int c)
1229 ALSChannelData *ch = cd[c];
1230 unsigned int dep = 0;
1231 unsigned int channels = ctx->avctx->channels;
1238 while (dep < channels && !ch[dep].stop_flag) {
1239 revert_channel_correlation(ctx, bd, cd, reverted, offset,
1240 ch[dep].master_channel);
1245 if (dep == channels) {
1246 av_log(ctx->avctx, AV_LOG_WARNING, "Invalid channel correlation.\n");
1250 bd->const_block = ctx->const_block + c;
1251 bd->shift_lsbs = ctx->shift_lsbs + c;
1252 bd->opt_order = ctx->opt_order + c;
1253 bd->store_prev_samples = ctx->store_prev_samples + c;
1254 bd->use_ltp = ctx->use_ltp + c;
1255 bd->ltp_lag = ctx->ltp_lag + c;
1256 bd->ltp_gain = ctx->ltp_gain[c];
1257 bd->lpc_cof = ctx->lpc_cof[c];
1258 bd->quant_cof = ctx->quant_cof[c];
1259 bd->raw_samples = ctx->raw_samples[c] + offset;
1262 while (!ch[dep].stop_flag) {
1264 unsigned int begin = 1;
1265 unsigned int end = bd->block_length - 1;
1267 int32_t *master = ctx->raw_samples[ch[dep].master_channel] + offset;
1269 if (ch[dep].time_diff_flag) {
1270 int t = ch[dep].time_diff_index;
1272 if (ch[dep].time_diff_sign) {
1279 for (smp = begin; smp < end; smp++) {
1281 MUL64(ch[dep].weighting[0], master[smp - 1 ]) +
1282 MUL64(ch[dep].weighting[1], master[smp ]) +
1283 MUL64(ch[dep].weighting[2], master[smp + 1 ]) +
1284 MUL64(ch[dep].weighting[3], master[smp - 1 + t]) +
1285 MUL64(ch[dep].weighting[4], master[smp + t]) +
1286 MUL64(ch[dep].weighting[5], master[smp + 1 + t]);
1288 bd->raw_samples[smp] += y >> 7;
1291 for (smp = begin; smp < end; smp++) {
1293 MUL64(ch[dep].weighting[0], master[smp - 1]) +
1294 MUL64(ch[dep].weighting[1], master[smp ]) +
1295 MUL64(ch[dep].weighting[2], master[smp + 1]);
1297 bd->raw_samples[smp] += y >> 7;
1308 /** Read the frame data.
1310 static int read_frame_data(ALSDecContext *ctx, unsigned int ra_frame)
1312 ALSSpecificConfig *sconf = &ctx->sconf;
1313 AVCodecContext *avctx = ctx->avctx;
1314 GetBitContext *gb = &ctx->gb;
1315 unsigned int div_blocks[32]; ///< block sizes.
1317 unsigned int js_blocks[2];
1319 uint32_t bs_info = 0;
1321 // skip the size of the ra unit if present in the frame
1322 if (sconf->ra_flag == RA_FLAG_FRAMES && ra_frame)
1323 skip_bits_long(gb, 32);
1325 if (sconf->mc_coding && sconf->joint_stereo) {
1326 ctx->js_switch = get_bits1(gb);
1330 if (!sconf->mc_coding || ctx->js_switch) {
1331 int independent_bs = !sconf->joint_stereo;
1333 for (c = 0; c < avctx->channels; c++) {
1337 get_block_sizes(ctx, div_blocks, &bs_info);
1339 // if joint_stereo and block_switching is set, independent decoding
1340 // is signaled via the first bit of bs_info
1341 if (sconf->joint_stereo && sconf->block_switching)
1345 // if this is the last channel, it has to be decoded independently
1346 if (c == avctx->channels - 1)
1349 if (independent_bs) {
1350 if (decode_blocks_ind(ctx, ra_frame, c, div_blocks, js_blocks))
1355 if (decode_blocks(ctx, ra_frame, c, div_blocks, js_blocks))
1361 // store carryover raw samples
1362 memmove(ctx->raw_samples[c] - sconf->max_order,
1363 ctx->raw_samples[c] - sconf->max_order + sconf->frame_length,
1364 sizeof(*ctx->raw_samples[c]) * sconf->max_order);
1366 } else { // multi-channel coding
1367 ALSBlockData bd = { 0 };
1369 int *reverted_channels = ctx->reverted_channels;
1370 unsigned int offset = 0;
1372 for (c = 0; c < avctx->channels; c++)
1373 if (ctx->chan_data[c] < ctx->chan_data_buffer) {
1374 av_log(ctx->avctx, AV_LOG_ERROR, "Invalid channel data.\n");
1378 memset(reverted_channels, 0, sizeof(*reverted_channels) * avctx->channels);
1380 bd.ra_block = ra_frame;
1381 bd.prev_raw_samples = ctx->prev_raw_samples;
1383 get_block_sizes(ctx, div_blocks, &bs_info);
1385 for (b = 0; b < ctx->num_blocks; b++) {
1386 bd.block_length = div_blocks[b];
1388 for (c = 0; c < avctx->channels; c++) {
1389 bd.const_block = ctx->const_block + c;
1390 bd.shift_lsbs = ctx->shift_lsbs + c;
1391 bd.opt_order = ctx->opt_order + c;
1392 bd.store_prev_samples = ctx->store_prev_samples + c;
1393 bd.use_ltp = ctx->use_ltp + c;
1394 bd.ltp_lag = ctx->ltp_lag + c;
1395 bd.ltp_gain = ctx->ltp_gain[c];
1396 bd.lpc_cof = ctx->lpc_cof[c];
1397 bd.quant_cof = ctx->quant_cof[c];
1398 bd.raw_samples = ctx->raw_samples[c] + offset;
1399 bd.raw_other = NULL;
1401 if ((ret = read_block(ctx, &bd)) < 0)
1403 if ((ret = read_channel_data(ctx, ctx->chan_data[c], c)) < 0)
1407 for (c = 0; c < avctx->channels; c++)
1408 if (revert_channel_correlation(ctx, &bd, ctx->chan_data,
1409 reverted_channels, offset, c))
1412 for (c = 0; c < avctx->channels; c++) {
1413 bd.const_block = ctx->const_block + c;
1414 bd.shift_lsbs = ctx->shift_lsbs + c;
1415 bd.opt_order = ctx->opt_order + c;
1416 bd.store_prev_samples = ctx->store_prev_samples + c;
1417 bd.use_ltp = ctx->use_ltp + c;
1418 bd.ltp_lag = ctx->ltp_lag + c;
1419 bd.ltp_gain = ctx->ltp_gain[c];
1420 bd.lpc_cof = ctx->lpc_cof[c];
1421 bd.quant_cof = ctx->quant_cof[c];
1422 bd.raw_samples = ctx->raw_samples[c] + offset;
1424 if ((ret = decode_block(ctx, &bd)) < 0)
1428 memset(reverted_channels, 0, avctx->channels * sizeof(*reverted_channels));
1429 offset += div_blocks[b];
1433 // store carryover raw samples
1434 for (c = 0; c < avctx->channels; c++)
1435 memmove(ctx->raw_samples[c] - sconf->max_order,
1436 ctx->raw_samples[c] - sconf->max_order + sconf->frame_length,
1437 sizeof(*ctx->raw_samples[c]) * sconf->max_order);
1440 // TODO: read_diff_float_data
1446 /** Decode an ALS frame.
1448 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame_ptr,
1451 ALSDecContext *ctx = avctx->priv_data;
1452 AVFrame *frame = 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 frame->nb_samples = ctx->cur_frame_length;
1483 if ((ret = ff_get_buffer(avctx, 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*)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 *)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*) 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 *)frame->data[0],
1545 ctx->cur_frame_length * avctx->channels);
1547 crc_source = ctx->crc_buffer;
1549 crc_source = 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");
1567 bytes_read = invalid_frame ? buffer_size :
1568 (get_bits_count(&ctx->gb) + 7) >> 3;
1574 /** Uninitialize the ALS decoder.
1576 static av_cold int decode_end(AVCodecContext *avctx)
1578 ALSDecContext *ctx = avctx->priv_data;
1580 av_freep(&ctx->sconf.chan_pos);
1582 ff_bgmc_end(&ctx->bgmc_lut, &ctx->bgmc_lut_status);
1584 av_freep(&ctx->const_block);
1585 av_freep(&ctx->shift_lsbs);
1586 av_freep(&ctx->opt_order);
1587 av_freep(&ctx->store_prev_samples);
1588 av_freep(&ctx->use_ltp);
1589 av_freep(&ctx->ltp_lag);
1590 av_freep(&ctx->ltp_gain);
1591 av_freep(&ctx->ltp_gain_buffer);
1592 av_freep(&ctx->quant_cof);
1593 av_freep(&ctx->lpc_cof);
1594 av_freep(&ctx->quant_cof_buffer);
1595 av_freep(&ctx->lpc_cof_buffer);
1596 av_freep(&ctx->lpc_cof_reversed_buffer);
1597 av_freep(&ctx->prev_raw_samples);
1598 av_freep(&ctx->raw_samples);
1599 av_freep(&ctx->raw_buffer);
1600 av_freep(&ctx->chan_data);
1601 av_freep(&ctx->chan_data_buffer);
1602 av_freep(&ctx->reverted_channels);
1603 av_freep(&ctx->crc_buffer);
1609 /** Initialize the ALS decoder.
1611 static av_cold int decode_init(AVCodecContext *avctx)
1614 unsigned int channel_size;
1616 ALSDecContext *ctx = avctx->priv_data;
1617 ALSSpecificConfig *sconf = &ctx->sconf;
1620 if (!avctx->extradata) {
1621 av_log(avctx, AV_LOG_ERROR, "Missing required ALS extradata.\n");
1625 if (read_specific_config(ctx)) {
1626 av_log(avctx, AV_LOG_ERROR, "Reading ALSSpecificConfig failed.\n");
1631 if (check_specific_config(ctx)) {
1637 ff_bgmc_init(avctx, &ctx->bgmc_lut, &ctx->bgmc_lut_status);
1639 if (sconf->floating) {
1640 avctx->sample_fmt = AV_SAMPLE_FMT_FLT;
1641 avctx->bits_per_raw_sample = 32;
1643 avctx->sample_fmt = sconf->resolution > 1
1644 ? AV_SAMPLE_FMT_S32 : AV_SAMPLE_FMT_S16;
1645 avctx->bits_per_raw_sample = (sconf->resolution + 1) * 8;
1648 // set maximum Rice parameter for progressive decoding based on resolution
1649 // This is not specified in 14496-3 but actually done by the reference
1650 // codec RM22 revision 2.
1651 ctx->s_max = sconf->resolution > 1 ? 31 : 15;
1653 // set lag value for long-term prediction
1654 ctx->ltp_lag_length = 8 + (avctx->sample_rate >= 96000) +
1655 (avctx->sample_rate >= 192000);
1657 // allocate quantized parcor coefficient buffer
1658 num_buffers = sconf->mc_coding ? avctx->channels : 1;
1660 ctx->quant_cof = av_malloc(sizeof(*ctx->quant_cof) * num_buffers);
1661 ctx->lpc_cof = av_malloc(sizeof(*ctx->lpc_cof) * num_buffers);
1662 ctx->quant_cof_buffer = av_malloc(sizeof(*ctx->quant_cof_buffer) *
1663 num_buffers * sconf->max_order);
1664 ctx->lpc_cof_buffer = av_malloc(sizeof(*ctx->lpc_cof_buffer) *
1665 num_buffers * sconf->max_order);
1666 ctx->lpc_cof_reversed_buffer = av_malloc(sizeof(*ctx->lpc_cof_buffer) *
1669 if (!ctx->quant_cof || !ctx->lpc_cof ||
1670 !ctx->quant_cof_buffer || !ctx->lpc_cof_buffer ||
1671 !ctx->lpc_cof_reversed_buffer) {
1672 av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
1673 return AVERROR(ENOMEM);
1676 // assign quantized parcor coefficient buffers
1677 for (c = 0; c < num_buffers; c++) {
1678 ctx->quant_cof[c] = ctx->quant_cof_buffer + c * sconf->max_order;
1679 ctx->lpc_cof[c] = ctx->lpc_cof_buffer + c * sconf->max_order;
1682 // allocate and assign lag and gain data buffer for ltp mode
1683 ctx->const_block = av_malloc (sizeof(*ctx->const_block) * num_buffers);
1684 ctx->shift_lsbs = av_malloc (sizeof(*ctx->shift_lsbs) * num_buffers);
1685 ctx->opt_order = av_malloc (sizeof(*ctx->opt_order) * num_buffers);
1686 ctx->store_prev_samples = av_malloc(sizeof(*ctx->store_prev_samples) * num_buffers);
1687 ctx->use_ltp = av_mallocz(sizeof(*ctx->use_ltp) * num_buffers);
1688 ctx->ltp_lag = av_malloc (sizeof(*ctx->ltp_lag) * num_buffers);
1689 ctx->ltp_gain = av_malloc (sizeof(*ctx->ltp_gain) * num_buffers);
1690 ctx->ltp_gain_buffer = av_malloc (sizeof(*ctx->ltp_gain_buffer) *
1693 if (!ctx->const_block || !ctx->shift_lsbs ||
1694 !ctx->opt_order || !ctx->store_prev_samples ||
1695 !ctx->use_ltp || !ctx->ltp_lag ||
1696 !ctx->ltp_gain || !ctx->ltp_gain_buffer) {
1697 av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
1699 return AVERROR(ENOMEM);
1702 for (c = 0; c < num_buffers; c++)
1703 ctx->ltp_gain[c] = ctx->ltp_gain_buffer + c * 5;
1705 // allocate and assign channel data buffer for mcc mode
1706 if (sconf->mc_coding) {
1707 ctx->chan_data_buffer = av_malloc(sizeof(*ctx->chan_data_buffer) *
1708 num_buffers * num_buffers);
1709 ctx->chan_data = av_malloc(sizeof(*ctx->chan_data) *
1711 ctx->reverted_channels = av_malloc(sizeof(*ctx->reverted_channels) *
1714 if (!ctx->chan_data_buffer || !ctx->chan_data || !ctx->reverted_channels) {
1715 av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
1717 return AVERROR(ENOMEM);
1720 for (c = 0; c < num_buffers; c++)
1721 ctx->chan_data[c] = ctx->chan_data_buffer + c * num_buffers;
1723 ctx->chan_data = NULL;
1724 ctx->chan_data_buffer = NULL;
1725 ctx->reverted_channels = NULL;
1728 channel_size = sconf->frame_length + sconf->max_order;
1730 ctx->prev_raw_samples = av_malloc (sizeof(*ctx->prev_raw_samples) * sconf->max_order);
1731 ctx->raw_buffer = av_mallocz(sizeof(*ctx-> raw_buffer) * avctx->channels * channel_size);
1732 ctx->raw_samples = av_malloc (sizeof(*ctx-> raw_samples) * avctx->channels);
1734 // allocate previous raw sample buffer
1735 if (!ctx->prev_raw_samples || !ctx->raw_buffer|| !ctx->raw_samples) {
1736 av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
1738 return AVERROR(ENOMEM);
1741 // assign raw samples buffers
1742 ctx->raw_samples[0] = ctx->raw_buffer + sconf->max_order;
1743 for (c = 1; c < avctx->channels; c++)
1744 ctx->raw_samples[c] = ctx->raw_samples[c - 1] + channel_size;
1746 // allocate crc buffer
1747 if (HAVE_BIGENDIAN != sconf->msb_first && sconf->crc_enabled &&
1748 (avctx->err_recognition & (AV_EF_CRCCHECK|AV_EF_CAREFUL))) {
1749 ctx->crc_buffer = av_malloc(sizeof(*ctx->crc_buffer) *
1750 ctx->cur_frame_length *
1752 av_get_bytes_per_sample(avctx->sample_fmt));
1753 if (!ctx->crc_buffer) {
1754 av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
1756 return AVERROR(ENOMEM);
1760 ff_dsputil_init(&ctx->dsp, avctx);
1766 /** Flush (reset) the frame ID after seeking.
1768 static av_cold void flush(AVCodecContext *avctx)
1770 ALSDecContext *ctx = avctx->priv_data;
1776 AVCodec ff_als_decoder = {
1778 .type = AVMEDIA_TYPE_AUDIO,
1779 .id = AV_CODEC_ID_MP4ALS,
1780 .priv_data_size = sizeof(ALSDecContext),
1781 .init = decode_init,
1782 .close = decode_end,
1783 .decode = decode_frame,
1785 .capabilities = CODEC_CAP_SUBFRAMES | CODEC_CAP_DR1,
1786 .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 Audio Lossless Coding (ALS)"),