FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/alsdec.c
Date: 2025-07-28 20:30:09
Exec Total Coverage
Lines: 677 1043 64.9%
Functions: 21 27 77.8%
Branches: 334 654 51.1%
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1 /*
2 * MPEG-4 ALS decoder
3 * Copyright (c) 2009 Thilo Borgmann <thilo.borgmann _at_ mail.de>
4 *
5 * This file is part of FFmpeg.
6 *
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.
11 *
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.
16 *
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
20 */
21
22 /**
23 * @file
24 * MPEG-4 ALS decoder
25 * @author Thilo Borgmann <thilo.borgmann _at_ mail.de>
26 */
27
28 #include <inttypes.h>
29
30 #include "avcodec.h"
31 #include "get_bits.h"
32 #include "unary.h"
33 #include "mpeg4audio.h"
34 #include "bgmc.h"
35 #include "bswapdsp.h"
36 #include "codec_internal.h"
37 #include "decode.h"
38 #include "internal.h"
39 #include "mlz.h"
40 #include "libavutil/mem.h"
41 #include "libavutil/opt.h"
42 #include "libavutil/samplefmt.h"
43 #include "libavutil/crc.h"
44 #include "libavutil/softfloat_ieee754.h"
45 #include "libavutil/intreadwrite.h"
46
47 #include <stdint.h>
48
49 /** Rice parameters and corresponding index offsets for decoding the
50 * indices of scaled PARCOR values. The table chosen is set globally
51 * by the encoder and stored in ALSSpecificConfig.
52 */
53 static const int8_t parcor_rice_table[3][20][2] = {
54 { {-52, 4}, {-29, 5}, {-31, 4}, { 19, 4}, {-16, 4},
55 { 12, 3}, { -7, 3}, { 9, 3}, { -5, 3}, { 6, 3},
56 { -4, 3}, { 3, 3}, { -3, 2}, { 3, 2}, { -2, 2},
57 { 3, 2}, { -1, 2}, { 2, 2}, { -1, 2}, { 2, 2} },
58 { {-58, 3}, {-42, 4}, {-46, 4}, { 37, 5}, {-36, 4},
59 { 29, 4}, {-29, 4}, { 25, 4}, {-23, 4}, { 20, 4},
60 {-17, 4}, { 16, 4}, {-12, 4}, { 12, 3}, {-10, 4},
61 { 7, 3}, { -4, 4}, { 3, 3}, { -1, 3}, { 1, 3} },
62 { {-59, 3}, {-45, 5}, {-50, 4}, { 38, 4}, {-39, 4},
63 { 32, 4}, {-30, 4}, { 25, 3}, {-23, 3}, { 20, 3},
64 {-20, 3}, { 16, 3}, {-13, 3}, { 10, 3}, { -7, 3},
65 { 3, 3}, { 0, 3}, { -1, 3}, { 2, 3}, { -1, 2} }
66 };
67
68
69 /** Scaled PARCOR values used for the first two PARCOR coefficients.
70 * To be indexed by the Rice coded indices.
71 * Generated by: parcor_scaled_values[i] = 32 + ((i * (i+1)) << 7) - (1 << 20)
72 * Actual values are divided by 32 in order to be stored in 16 bits.
73 */
74 static const int16_t parcor_scaled_values[] = {
75 -1048544 / 32, -1048288 / 32, -1047776 / 32, -1047008 / 32,
76 -1045984 / 32, -1044704 / 32, -1043168 / 32, -1041376 / 32,
77 -1039328 / 32, -1037024 / 32, -1034464 / 32, -1031648 / 32,
78 -1028576 / 32, -1025248 / 32, -1021664 / 32, -1017824 / 32,
79 -1013728 / 32, -1009376 / 32, -1004768 / 32, -999904 / 32,
80 -994784 / 32, -989408 / 32, -983776 / 32, -977888 / 32,
81 -971744 / 32, -965344 / 32, -958688 / 32, -951776 / 32,
82 -944608 / 32, -937184 / 32, -929504 / 32, -921568 / 32,
83 -913376 / 32, -904928 / 32, -896224 / 32, -887264 / 32,
84 -878048 / 32, -868576 / 32, -858848 / 32, -848864 / 32,
85 -838624 / 32, -828128 / 32, -817376 / 32, -806368 / 32,
86 -795104 / 32, -783584 / 32, -771808 / 32, -759776 / 32,
87 -747488 / 32, -734944 / 32, -722144 / 32, -709088 / 32,
88 -695776 / 32, -682208 / 32, -668384 / 32, -654304 / 32,
89 -639968 / 32, -625376 / 32, -610528 / 32, -595424 / 32,
90 -580064 / 32, -564448 / 32, -548576 / 32, -532448 / 32,
91 -516064 / 32, -499424 / 32, -482528 / 32, -465376 / 32,
92 -447968 / 32, -430304 / 32, -412384 / 32, -394208 / 32,
93 -375776 / 32, -357088 / 32, -338144 / 32, -318944 / 32,
94 -299488 / 32, -279776 / 32, -259808 / 32, -239584 / 32,
95 -219104 / 32, -198368 / 32, -177376 / 32, -156128 / 32,
96 -134624 / 32, -112864 / 32, -90848 / 32, -68576 / 32,
97 -46048 / 32, -23264 / 32, -224 / 32, 23072 / 32,
98 46624 / 32, 70432 / 32, 94496 / 32, 118816 / 32,
99 143392 / 32, 168224 / 32, 193312 / 32, 218656 / 32,
100 244256 / 32, 270112 / 32, 296224 / 32, 322592 / 32,
101 349216 / 32, 376096 / 32, 403232 / 32, 430624 / 32,
102 458272 / 32, 486176 / 32, 514336 / 32, 542752 / 32,
103 571424 / 32, 600352 / 32, 629536 / 32, 658976 / 32,
104 688672 / 32, 718624 / 32, 748832 / 32, 779296 / 32,
105 810016 / 32, 840992 / 32, 872224 / 32, 903712 / 32,
106 935456 / 32, 967456 / 32, 999712 / 32, 1032224 / 32
107 };
108
109
110 /** Gain values of p(0) for long-term prediction.
111 * To be indexed by the Rice coded indices.
112 */
113 static const uint8_t ltp_gain_values [4][4] = {
114 { 0, 8, 16, 24},
115 {32, 40, 48, 56},
116 {64, 70, 76, 82},
117 {88, 92, 96, 100}
118 };
119
120
121 /** Inter-channel weighting factors for multi-channel correlation.
122 * To be indexed by the Rice coded indices.
123 */
124 static const int16_t mcc_weightings[] = {
125 204, 192, 179, 166, 153, 140, 128, 115,
126 102, 89, 76, 64, 51, 38, 25, 12,
127 0, -12, -25, -38, -51, -64, -76, -89,
128 -102, -115, -128, -140, -153, -166, -179, -192
129 };
130
131
132 /** Tail codes used in arithmetic coding using block Gilbert-Moore codes.
133 */
134 static const uint8_t tail_code[16][6] = {
135 { 74, 44, 25, 13, 7, 3},
136 { 68, 42, 24, 13, 7, 3},
137 { 58, 39, 23, 13, 7, 3},
138 {126, 70, 37, 19, 10, 5},
139 {132, 70, 37, 20, 10, 5},
140 {124, 70, 38, 20, 10, 5},
141 {120, 69, 37, 20, 11, 5},
142 {116, 67, 37, 20, 11, 5},
143 {108, 66, 36, 20, 10, 5},
144 {102, 62, 36, 20, 10, 5},
145 { 88, 58, 34, 19, 10, 5},
146 {162, 89, 49, 25, 13, 7},
147 {156, 87, 49, 26, 14, 7},
148 {150, 86, 47, 26, 14, 7},
149 {142, 84, 47, 26, 14, 7},
150 {131, 79, 46, 26, 14, 7}
151 };
152
153
154 enum RA_Flag {
155 RA_FLAG_NONE,
156 RA_FLAG_FRAMES,
157 RA_FLAG_HEADER
158 };
159
160
161 typedef struct ALSSpecificConfig {
162 uint32_t samples; ///< number of samples, 0xFFFFFFFF if unknown
163 int resolution; ///< 000 = 8-bit; 001 = 16-bit; 010 = 24-bit; 011 = 32-bit
164 int floating; ///< 1 = IEEE 32-bit floating-point, 0 = integer
165 int msb_first; ///< 1 = original CRC calculated on big-endian system, 0 = little-endian
166 int frame_length; ///< frame length for each frame (last frame may differ)
167 int ra_distance; ///< distance between RA frames (in frames, 0...255)
168 enum RA_Flag ra_flag; ///< indicates where the size of ra units is stored
169 int adapt_order; ///< adaptive order: 1 = on, 0 = off
170 int coef_table; ///< table index of Rice code parameters
171 int long_term_prediction; ///< long term prediction (LTP): 1 = on, 0 = off
172 int max_order; ///< maximum prediction order (0..1023)
173 int block_switching; ///< number of block switching levels
174 int bgmc; ///< "Block Gilbert-Moore Code": 1 = on, 0 = off (Rice coding only)
175 int sb_part; ///< sub-block partition
176 int joint_stereo; ///< joint stereo: 1 = on, 0 = off
177 int mc_coding; ///< extended inter-channel coding (multi channel coding): 1 = on, 0 = off
178 int chan_config; ///< indicates that a chan_config_info field is present
179 int chan_sort; ///< channel rearrangement: 1 = on, 0 = off
180 int rlslms; ///< use "Recursive Least Square-Least Mean Square" predictor: 1 = on, 0 = off
181 int chan_config_info; ///< mapping of channels to loudspeaker locations. Unused until setting channel configuration is implemented.
182 int *chan_pos; ///< original channel positions
183 int crc_enabled; ///< enable Cyclic Redundancy Checksum
184 } ALSSpecificConfig;
185
186
187 typedef struct ALSChannelData {
188 int stop_flag;
189 int master_channel;
190 int time_diff_flag;
191 int time_diff_sign;
192 int time_diff_index;
193 int weighting[6];
194 } ALSChannelData;
195
196
197 typedef struct ALSDecContext {
198 AVClass *av_class;
199 AVCodecContext *avctx;
200 ALSSpecificConfig sconf;
201 GetBitContext gb;
202 BswapDSPContext bdsp;
203 const AVCRC *crc_table;
204 uint32_t crc_org; ///< CRC value of the original input data
205 uint32_t crc; ///< CRC value calculated from decoded data
206 unsigned int cur_frame_length; ///< length of the current frame to decode
207 unsigned int frame_id; ///< the frame ID / number of the current frame
208 unsigned int js_switch; ///< if true, joint-stereo decoding is enforced
209 unsigned int cs_switch; ///< if true, channel rearrangement is done
210 unsigned int num_blocks; ///< number of blocks used in the current frame
211 unsigned int s_max; ///< maximum Rice parameter allowed in entropy coding
212 uint8_t *bgmc_lut; ///< pointer at lookup tables used for BGMC
213 int *bgmc_lut_status; ///< pointer at lookup table status flags used for BGMC
214 int ltp_lag_length; ///< number of bits used for ltp lag value
215 int *const_block; ///< contains const_block flags for all channels
216 unsigned int *shift_lsbs; ///< contains shift_lsbs flags for all channels
217 unsigned int *opt_order; ///< contains opt_order flags for all channels
218 int *store_prev_samples; ///< contains store_prev_samples flags for all channels
219 int *use_ltp; ///< contains use_ltp flags for all channels
220 int *ltp_lag; ///< contains ltp lag values for all channels
221 int **ltp_gain; ///< gain values for ltp 5-tap filter for a channel
222 int *ltp_gain_buffer; ///< contains all gain values for ltp 5-tap filter
223 int32_t **quant_cof; ///< quantized parcor coefficients for a channel
224 int32_t *quant_cof_buffer; ///< contains all quantized parcor coefficients
225 int32_t **lpc_cof; ///< coefficients of the direct form prediction filter for a channel
226 int32_t *lpc_cof_buffer; ///< contains all coefficients of the direct form prediction filter
227 int32_t *lpc_cof_reversed_buffer; ///< temporary buffer to set up a reversed versio of lpc_cof_buffer
228 ALSChannelData **chan_data; ///< channel data for multi-channel correlation
229 ALSChannelData *chan_data_buffer; ///< contains channel data for all channels
230 int *reverted_channels; ///< stores a flag for each reverted channel
231 int32_t *prev_raw_samples; ///< contains unshifted raw samples from the previous block
232 int32_t **raw_samples; ///< decoded raw samples for each channel
233 int32_t *raw_buffer; ///< contains all decoded raw samples including carryover samples
234 uint8_t *crc_buffer; ///< buffer of byte order corrected samples used for CRC check
235 MLZ* mlz; ///< masked lz decompression structure
236 SoftFloat_IEEE754 *acf; ///< contains common multiplier for all channels
237 int *last_acf_mantissa; ///< contains the last acf mantissa data of common multiplier for all channels
238 int *shift_value; ///< value by which the binary point is to be shifted for all channels
239 int *last_shift_value; ///< contains last shift value for all channels
240 int **raw_mantissa; ///< decoded mantissa bits of the difference signal
241 unsigned char *larray; ///< buffer to store the output of masked lz decompression
242 int *nbits; ///< contains the number of bits to read for masked lz decompression for all samples
243 int highest_decoded_channel;
244 int user_max_order; ///< user specified maximum prediction order
245 } ALSDecContext;
246
247
248 typedef struct ALSBlockData {
249 unsigned int block_length; ///< number of samples within the block
250 unsigned int ra_block; ///< if true, this is a random access block
251 int *const_block; ///< if true, this is a constant value block
252 int js_blocks; ///< true if this block contains a difference signal
253 unsigned int *shift_lsbs; ///< shift of values for this block
254 unsigned int *opt_order; ///< prediction order of this block
255 int *store_prev_samples;///< if true, carryover samples have to be stored
256 int *use_ltp; ///< if true, long-term prediction is used
257 int *ltp_lag; ///< lag value for long-term prediction
258 int *ltp_gain; ///< gain values for ltp 5-tap filter
259 int32_t *quant_cof; ///< quantized parcor coefficients
260 int32_t *lpc_cof; ///< coefficients of the direct form prediction
261 int32_t *raw_samples; ///< decoded raw samples / residuals for this block
262 int32_t *prev_raw_samples; ///< contains unshifted raw samples from the previous block
263 int32_t *raw_other; ///< decoded raw samples of the other channel of a channel pair
264 } ALSBlockData;
265
266
267 14 static av_cold void dprint_specific_config(ALSDecContext *ctx)
268 {
269 #ifdef DEBUG
270 AVCodecContext *avctx = ctx->avctx;
271 ALSSpecificConfig *sconf = &ctx->sconf;
272
273 ff_dlog(avctx, "resolution = %i\n", sconf->resolution);
274 ff_dlog(avctx, "floating = %i\n", sconf->floating);
275 ff_dlog(avctx, "frame_length = %i\n", sconf->frame_length);
276 ff_dlog(avctx, "ra_distance = %i\n", sconf->ra_distance);
277 ff_dlog(avctx, "ra_flag = %i\n", sconf->ra_flag);
278 ff_dlog(avctx, "adapt_order = %i\n", sconf->adapt_order);
279 ff_dlog(avctx, "coef_table = %i\n", sconf->coef_table);
280 ff_dlog(avctx, "long_term_prediction = %i\n", sconf->long_term_prediction);
281 ff_dlog(avctx, "max_order = %i\n", sconf->max_order);
282 ff_dlog(avctx, "block_switching = %i\n", sconf->block_switching);
283 ff_dlog(avctx, "bgmc = %i\n", sconf->bgmc);
284 ff_dlog(avctx, "sb_part = %i\n", sconf->sb_part);
285 ff_dlog(avctx, "joint_stereo = %i\n", sconf->joint_stereo);
286 ff_dlog(avctx, "mc_coding = %i\n", sconf->mc_coding);
287 ff_dlog(avctx, "chan_config = %i\n", sconf->chan_config);
288 ff_dlog(avctx, "chan_sort = %i\n", sconf->chan_sort);
289 ff_dlog(avctx, "RLSLMS = %i\n", sconf->rlslms);
290 ff_dlog(avctx, "chan_config_info = %i\n", sconf->chan_config_info);
291 #endif
292 14 }
293
294
295 /** Read an ALSSpecificConfig from a buffer into the output struct.
296 */
297 14 static av_cold int read_specific_config(ALSDecContext *ctx)
298 {
299 GetBitContext gb;
300 uint64_t ht_size;
301 int i, config_offset;
302 14 MPEG4AudioConfig m4ac = {0};
303 14 ALSSpecificConfig *sconf = &ctx->sconf;
304 14 AVCodecContext *avctx = ctx->avctx;
305 uint32_t als_id, header_size, trailer_size;
306 int ret;
307
308
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 14 if ((ret = init_get_bits8(&gb, avctx->extradata, avctx->extradata_size)) < 0)
309 ✗ return ret;
310
311 14 config_offset = avpriv_mpeg4audio_get_config2(&m4ac, avctx->extradata,
312 avctx->extradata_size, 1, avctx);
313
314
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 14 if (config_offset < 0)
315 ✗ return AVERROR_INVALIDDATA;
316
317 14 skip_bits_long(&gb, config_offset);
318
319
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 14 if (get_bits_left(&gb) < (30 << 3))
320 ✗ return AVERROR_INVALIDDATA;
321
322 // read the fixed items
323 14 als_id = get_bits_long(&gb, 32);
324 14 avctx->sample_rate = m4ac.sample_rate;
325 14 skip_bits_long(&gb, 32); // sample rate already known
326 14 sconf->samples = get_bits_long(&gb, 32);
327
328
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 14 if (avctx->ch_layout.nb_channels != m4ac.channels) {
329 ✗ av_channel_layout_uninit(&avctx->ch_layout);
330 ✗ avctx->ch_layout.order = AV_CHANNEL_ORDER_UNSPEC;
331 ✗ avctx->ch_layout.nb_channels = m4ac.channels;
332 }
333
334 14 skip_bits(&gb, 16); // number of channels already known
335 14 skip_bits(&gb, 3); // skip file_type
336 14 sconf->resolution = get_bits(&gb, 3);
337 14 sconf->floating = get_bits1(&gb);
338 14 sconf->msb_first = get_bits1(&gb);
339 14 sconf->frame_length = get_bits(&gb, 16) + 1;
340 14 sconf->ra_distance = get_bits(&gb, 8);
341 14 sconf->ra_flag = get_bits(&gb, 2);
342 14 sconf->adapt_order = get_bits1(&gb);
343 14 sconf->coef_table = get_bits(&gb, 2);
344 14 sconf->long_term_prediction = get_bits1(&gb);
345 14 sconf->max_order = get_bits(&gb, 10);
346 14 sconf->block_switching = get_bits(&gb, 2);
347 14 sconf->bgmc = get_bits1(&gb);
348 14 sconf->sb_part = get_bits1(&gb);
349 14 sconf->joint_stereo = get_bits1(&gb);
350 14 sconf->mc_coding = get_bits1(&gb);
351 14 sconf->chan_config = get_bits1(&gb);
352 14 sconf->chan_sort = get_bits1(&gb);
353 14 sconf->crc_enabled = get_bits1(&gb);
354 14 sconf->rlslms = get_bits1(&gb);
355 14 skip_bits(&gb, 5); // skip 5 reserved bits
356 14 skip_bits1(&gb); // skip aux_data_enabled
357
358
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 14 if (sconf->max_order > ctx->user_max_order) {
359 ✗ av_log(avctx, AV_LOG_ERROR, "order %d exceeds specified max %d\n", sconf->max_order, ctx->user_max_order);
360 ✗ return AVERROR_INVALIDDATA;
361 }
362
363
364 // check for ALSSpecificConfig struct
365
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 14 if (als_id != MKBETAG('A','L','S','\0'))
366 ✗ return AVERROR_INVALIDDATA;
367
368
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 14 if (avctx->ch_layout.nb_channels > FF_SANE_NB_CHANNELS) {
369 ✗ avpriv_request_sample(avctx, "Huge number of channels");
370 ✗ return AVERROR_PATCHWELCOME;
371 }
372
373
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 14 if (avctx->ch_layout.nb_channels == 0)
374 ✗ return AVERROR_INVALIDDATA;
375
376 14 ctx->cur_frame_length = sconf->frame_length;
377
378 // read channel config
379
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 14 if (sconf->chan_config)
380 ✗ sconf->chan_config_info = get_bits(&gb, 16);
381 // TODO: use this to set avctx->channel_layout
382
383
384 // read channel sorting
385
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 14 if (sconf->chan_sort && avctx->ch_layout.nb_channels > 1) {
386 ✗ int chan_pos_bits = av_ceil_log2(avctx->ch_layout.nb_channels);
387 ✗ int bits_needed = avctx->ch_layout.nb_channels * chan_pos_bits + 7;
388 ✗ if (get_bits_left(&gb) < bits_needed)
389 ✗ return AVERROR_INVALIDDATA;
390
391 ✗ if (!(sconf->chan_pos = av_malloc_array(avctx->ch_layout.nb_channels, sizeof(*sconf->chan_pos))))
392 ✗ return AVERROR(ENOMEM);
393
394 ✗ ctx->cs_switch = 1;
395
396 ✗ for (i = 0; i < avctx->ch_layout.nb_channels; i++) {
397 ✗ sconf->chan_pos[i] = -1;
398 }
399
400 ✗ for (i = 0; i < avctx->ch_layout.nb_channels; i++) {
401 int idx;
402
403 ✗ idx = get_bits(&gb, chan_pos_bits);
404 ✗ if (idx >= avctx->ch_layout.nb_channels || sconf->chan_pos[idx] != -1) {
405 ✗ av_log(avctx, AV_LOG_WARNING, "Invalid channel reordering.\n");
406 ✗ ctx->cs_switch = 0;
407 ✗ break;
408 }
409 ✗ sconf->chan_pos[idx] = i;
410 }
411
412 ✗ align_get_bits(&gb);
413 }
414
415
416 // read fixed header and trailer sizes,
417 // if size = 0xFFFFFFFF then there is no data field!
418
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 14 if (get_bits_left(&gb) < 64)
419 ✗ return AVERROR_INVALIDDATA;
420
421 14 header_size = get_bits_long(&gb, 32);
422 14 trailer_size = get_bits_long(&gb, 32);
423
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 14 if (header_size == 0xFFFFFFFF)
424 ✗ header_size = 0;
425
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 14 if (trailer_size == 0xFFFFFFFF)
426 ✗ trailer_size = 0;
427
428 14 ht_size = ((int64_t)(header_size) + (int64_t)(trailer_size)) << 3;
429
430
431 // skip the header and trailer data
432
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 14 if (get_bits_left(&gb) < ht_size)
433 ✗ return AVERROR_INVALIDDATA;
434
435
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 14 if (ht_size > INT32_MAX)
436 ✗ return AVERROR_PATCHWELCOME;
437
438 14 skip_bits_long(&gb, ht_size);
439
440
441 // initialize CRC calculation
442
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 14 if (sconf->crc_enabled) {
443
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 14 if (get_bits_left(&gb) < 32)
444 ✗ return AVERROR_INVALIDDATA;
445
446
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 14 if (avctx->err_recognition & (AV_EF_CRCCHECK|AV_EF_CAREFUL)) {
447 ✗ ctx->crc_table = av_crc_get_table(AV_CRC_32_IEEE_LE);
448 ✗ ctx->crc = 0xFFFFFFFF;
449 ✗ ctx->crc_org = ~get_bits_long(&gb, 32);
450 } else
451 14 skip_bits_long(&gb, 32);
452 }
453
454
455 // no need to read the rest of ALSSpecificConfig (ra_unit_size & aux data)
456
457 14 dprint_specific_config(ctx);
458
459 14 return 0;
460 }
461
462
463 /** Check the ALSSpecificConfig for unsupported features.
464 */
465 14 static int check_specific_config(ALSDecContext *ctx)
466 {
467 14 ALSSpecificConfig *sconf = &ctx->sconf;
468 14 int error = 0;
469
470 // report unsupported feature and set error value
471 #define MISSING_ERR(cond, str, errval) \
472 { \
473 if (cond) { \
474 avpriv_report_missing_feature(ctx->avctx, \
475 str); \
476 error = errval; \
477 } \
478 }
479
480
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 14 MISSING_ERR(sconf->rlslms, "Adaptive RLS-LMS prediction", AVERROR_PATCHWELCOME);
481
482 14 return error;
483 }
484
485
486 /** Parse the bs_info field to extract the block partitioning used in
487 * block switching mode, refer to ISO/IEC 14496-3, section 11.6.2.
488 */
489 3146 static void parse_bs_info(const uint32_t bs_info, unsigned int n,
490 unsigned int div, unsigned int **div_blocks,
491 unsigned int *num_blocks)
492 {
493
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 3146 if (n < 31 && ((bs_info << n) & 0x40000000)) {
494 // if the level is valid and the investigated bit n is set
495 // then recursively check both children at bits (2n+1) and (2n+2)
496 121 n *= 2;
497 121 div += 1;
498 121 parse_bs_info(bs_info, n + 1, div, div_blocks, num_blocks);
499 121 parse_bs_info(bs_info, n + 2, div, div_blocks, num_blocks);
500 } else {
501 // else the bit is not set or the last level has been reached
502 // (bit implicitly not set)
503 3025 **div_blocks = div;
504 3025 (*div_blocks)++;
505 3025 (*num_blocks)++;
506 }
507 3146 }
508
509
510 /** Read and decode a Rice codeword.
511 */
512 7307594 static int32_t decode_rice(GetBitContext *gb, unsigned int k)
513 {
514 7307594 int max = get_bits_left(gb) - k;
515 7307594 unsigned q = get_unary(gb, 0, max);
516
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 7307594 int r = k ? get_bits1(gb) : !(q & 1);
517
518
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 7307594 if (k > 1) {
519 7018473 q <<= (k - 1);
520 7018473 q += get_bits_long(gb, k - 1);
521
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 289121 } else if (!k) {
522 231387 q >>= 1;
523 }
524
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 7307594 return r ? q : ~q;
525 }
526
527
528 /** Convert PARCOR coefficient k to direct filter coefficient.
529 */
530 137495 static void parcor_to_lpc(unsigned int k, const int32_t *par, int32_t *cof)
531 {
532 int i, j;
533
534
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 2584335 for (i = 0, j = k - 1; i < j; i++, j--) {
535 2446840 unsigned tmp1 = ((MUL64(par[k], cof[j]) + (1 << 19)) >> 20);
536 2446840 cof[j] += ((MUL64(par[k], cof[i]) + (1 << 19)) >> 20);
537 2446840 cof[i] += tmp1;
538 }
539
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 137495 if (i == j)
540 68217 cof[i] += ((MUL64(par[k], cof[j]) + (1 << 19)) >> 20);
541
542 137495 cof[k] = par[k];
543 137495 }
544
545
546 /** Read block switching field if necessary and set actual block sizes.
547 * Also assure that the block sizes of the last frame correspond to the
548 * actual number of samples.
549 */
550 2904 static void get_block_sizes(ALSDecContext *ctx, unsigned int *div_blocks,
551 uint32_t *bs_info)
552 {
553 2904 ALSSpecificConfig *sconf = &ctx->sconf;
554 2904 GetBitContext *gb = &ctx->gb;
555 2904 unsigned int *ptr_div_blocks = div_blocks;
556 unsigned int b;
557
558
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 2904 if (sconf->block_switching) {
559 112 unsigned int bs_info_len = 1 << (sconf->block_switching + 2);
560 112 *bs_info = get_bits_long(gb, bs_info_len);
561 112 *bs_info <<= (32 - bs_info_len);
562 }
563
564 2904 ctx->num_blocks = 0;
565 2904 parse_bs_info(*bs_info, 0, 0, &ptr_div_blocks, &ctx->num_blocks);
566
567 // The last frame may have an overdetermined block structure given in
568 // the bitstream. In that case the defined block structure would need
569 // more samples than available to be consistent.
570 // The block structure is actually used but the block sizes are adapted
571 // to fit the actual number of available samples.
572 // Example: 5 samples, 2nd level block sizes: 2 2 2 2.
573 // This results in the actual block sizes: 2 2 1 0.
574 // This is not specified in 14496-3 but actually done by the reference
575 // codec RM22 revision 2.
576 // This appears to happen in case of an odd number of samples in the last
577 // frame which is actually not allowed by the block length switching part
578 // of 14496-3.
579 // The ALS conformance files feature an odd number of samples in the last
580 // frame.
581
582
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 5929 for (b = 0; b < ctx->num_blocks; b++)
583 3025 div_blocks[b] = ctx->sconf.frame_length >> div_blocks[b];
584
585
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 2904 if (ctx->cur_frame_length != ctx->sconf.frame_length) {
586 12 unsigned int remaining = ctx->cur_frame_length;
587
588
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 17 for (b = 0; b < ctx->num_blocks; b++) {
589
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 17 if (remaining <= div_blocks[b]) {
590 12 div_blocks[b] = remaining;
591 12 ctx->num_blocks = b + 1;
592 12 break;
593 }
594
595 5 remaining -= div_blocks[b];
596 }
597 }
598 2904 }
599
600
601 /** Read the block data for a constant block
602 */
603 ✗ static int read_const_block_data(ALSDecContext *ctx, ALSBlockData *bd)
604 {
605 ✗ ALSSpecificConfig *sconf = &ctx->sconf;
606 ✗ AVCodecContext *avctx = ctx->avctx;
607 ✗ GetBitContext *gb = &ctx->gb;
608
609 ✗ if (bd->block_length <= 0)
610 ✗ return AVERROR_INVALIDDATA;
611
612 ✗ *bd->raw_samples = 0;
613 ✗ *bd->const_block = get_bits1(gb); // 1 = constant value, 0 = zero block (silence)
614 ✗ bd->js_blocks = get_bits1(gb);
615
616 // skip 5 reserved bits
617 ✗ skip_bits(gb, 5);
618
619 ✗ if (*bd->const_block) {
620 ✗ unsigned int const_val_bits = sconf->floating ? 24 : avctx->bits_per_raw_sample;
621 ✗ *bd->raw_samples = get_sbits_long(gb, const_val_bits);
622 }
623
624 // ensure constant block decoding by reusing this field
625 ✗ *bd->const_block = 1;
626
627 ✗ return 0;
628 }
629
630
631 /** Decode the block data for a constant block
632 */
633 ✗ static void decode_const_block_data(ALSDecContext *ctx, ALSBlockData *bd)
634 {
635 ✗ int smp = bd->block_length - 1;
636 ✗ int32_t val = *bd->raw_samples;
637 ✗ int32_t *dst = bd->raw_samples + 1;
638
639 // write raw samples into buffer
640 ✗ for (; smp; smp--)
641 ✗ *dst++ = val;
642 ✗ }
643
644
645 /** Read the block data for a non-constant block
646 */
647 4767 static int read_var_block_data(ALSDecContext *ctx, ALSBlockData *bd)
648 {
649 4767 ALSSpecificConfig *sconf = &ctx->sconf;
650 4767 AVCodecContext *avctx = ctx->avctx;
651 4767 GetBitContext *gb = &ctx->gb;
652 unsigned int k;
653 unsigned int s[8];
654 unsigned int sx[8];
655 unsigned int sub_blocks, log2_sub_blocks, sb_length;
656 4767 unsigned int start = 0;
657 unsigned int opt_order;
658 int sb;
659 4767 int32_t *quant_cof = bd->quant_cof;
660 int32_t *current_res;
661
662
663 // ensure variable block decoding by reusing this field
664 4767 *bd->const_block = 0;
665
666 4767 *bd->opt_order = 1;
667 4767 bd->js_blocks = get_bits1(gb);
668
669 4767 opt_order = *bd->opt_order;
670
671 // determine the number of subblocks for entropy decoding
672
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 4767 if (!sconf->bgmc && !sconf->sb_part) {
673 ✗ log2_sub_blocks = 0;
674 } else {
675
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 4767 if (sconf->bgmc && sconf->sb_part)
676 1722 log2_sub_blocks = get_bits(gb, 2);
677 else
678 3045 log2_sub_blocks = 2 * get_bits1(gb);
679 }
680
681 4767 sub_blocks = 1 << log2_sub_blocks;
682
683 // do not continue in case of a damaged stream since
684 // block_length must be evenly divisible by sub_blocks
685
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 4767 if (bd->block_length & (sub_blocks - 1) || bd->block_length <= 0) {
686 ✗ av_log(avctx, AV_LOG_WARNING,
687 "Block length is not evenly divisible by the number of subblocks.\n");
688 ✗ return AVERROR_INVALIDDATA;
689 }
690
691 4767 sb_length = bd->block_length >> log2_sub_blocks;
692
693
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 4767 if (sconf->bgmc) {
694
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 1722 s[0] = get_bits(gb, 8 + (sconf->resolution > 1));
695
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 3148 for (k = 1; k < sub_blocks; k++)
696 1426 s[k] = s[k - 1] + decode_rice(gb, 2);
697
698
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 4870 for (k = 0; k < sub_blocks; k++) {
699 3148 sx[k] = s[k] & 0x0F;
700 3148 s [k] >>= 4;
701 }
702 } else {
703
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 3045 s[0] = get_bits(gb, 4 + (sconf->resolution > 1));
704
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 5325 for (k = 1; k < sub_blocks; k++)
705 2280 s[k] = s[k - 1] + decode_rice(gb, 0);
706 }
707
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 8473 for (k = 1; k < sub_blocks; k++)
708
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 3706 if (s[k] > 32) {
709 ✗ av_log(avctx, AV_LOG_ERROR, "k invalid for rice code.\n");
710 ✗ return AVERROR_INVALIDDATA;
711 }
712
713
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 4767 if (get_bits1(gb))
714 ✗ *bd->shift_lsbs = get_bits(gb, 4) + 1;
715
716
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 4767 *bd->store_prev_samples = (bd->js_blocks && bd->raw_other) || *bd->shift_lsbs;
717
718
719
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 4767 if (!sconf->rlslms) {
720
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 6742 if (sconf->adapt_order && sconf->max_order) {
721 1975 int opt_order_length = av_ceil_log2(av_clip((bd->block_length >> 3) - 1,
722 1975 2, sconf->max_order + 1));
723 1975 *bd->opt_order = get_bits(gb, opt_order_length);
724
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 1975 if (*bd->opt_order > sconf->max_order) {
725 ✗ *bd->opt_order = sconf->max_order;
726 ✗ av_log(avctx, AV_LOG_ERROR, "Predictor order too large.\n");
727 ✗ return AVERROR_INVALIDDATA;
728 }
729 } else {
730 2792 *bd->opt_order = sconf->max_order;
731 }
732 4767 opt_order = *bd->opt_order;
733
734
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 4767 if (opt_order) {
735 int add_base;
736
737
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 4767 if (sconf->coef_table == 3) {
738 ✗ add_base = 0x7F;
739
740 // read coefficient 0
741 ✗ quant_cof[0] = 32 * parcor_scaled_values[get_bits(gb, 7)];
742
743 // read coefficient 1
744 ✗ if (opt_order > 1)
745 ✗ quant_cof[1] = -32 * parcor_scaled_values[get_bits(gb, 7)];
746
747 // read coefficients 2 to opt_order
748 ✗ for (k = 2; k < opt_order; k++)
749 ✗ quant_cof[k] = get_bits(gb, 7);
750 } else {
751 int k_max;
752 4767 add_base = 1;
753
754 // read coefficient 0 to 19
755 4767 k_max = FFMIN(opt_order, 20);
756
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 70514 for (k = 0; k < k_max; k++) {
757 65747 int rice_param = parcor_rice_table[sconf->coef_table][k][1];
758 65747 int offset = parcor_rice_table[sconf->coef_table][k][0];
759 65747 quant_cof[k] = decode_rice(gb, rice_param) + offset;
760
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 65747 if (quant_cof[k] < -64 || quant_cof[k] > 63) {
761 ✗ av_log(avctx, AV_LOG_ERROR,
762 "quant_cof %"PRId32" is out of range.\n",
763 ✗ quant_cof[k]);
764 ✗ return AVERROR_INVALIDDATA;
765 }
766 }
767
768 // read coefficients 20 to 126
769 4767 k_max = FFMIN(opt_order, 127);
770
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 75239 for (; k < k_max; k++)
771 70472 quant_cof[k] = decode_rice(gb, 2) + (k & 1);
772
773 // read coefficients 127 to opt_order
774
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 6043 for (; k < opt_order; k++)
775 1276 quant_cof[k] = decode_rice(gb, 1);
776
777 4767 quant_cof[0] = 32 * parcor_scaled_values[quant_cof[0] + 64];
778
779
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 4767 if (opt_order > 1)
780 4767 quant_cof[1] = -32 * parcor_scaled_values[quant_cof[1] + 64];
781 }
782
783
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 132728 for (k = 2; k < opt_order; k++)
784 127961 quant_cof[k] = (quant_cof[k] * (1U << 14)) + (add_base << 13);
785 }
786 }
787
788 // read LTP gain and lag values
789
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 4767 if (sconf->long_term_prediction) {
790 1722 *bd->use_ltp = get_bits1(gb);
791
792
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 1722 if (*bd->use_ltp) {
793 int r, c;
794
795 1558 bd->ltp_gain[0] = decode_rice(gb, 1) * 8;
796 1558 bd->ltp_gain[1] = decode_rice(gb, 2) * 8;
797
798 1558 r = get_unary(gb, 0, 4);
799 1558 c = get_bits(gb, 2);
800
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 1558 if (r >= 4) {
801 ✗ av_log(avctx, AV_LOG_ERROR, "r overflow\n");
802 ✗ return AVERROR_INVALIDDATA;
803 }
804
805 1558 bd->ltp_gain[2] = ltp_gain_values[r][c];
806
807 1558 bd->ltp_gain[3] = decode_rice(gb, 2) * 8;
808 1558 bd->ltp_gain[4] = decode_rice(gb, 1) * 8;
809
810 1558 *bd->ltp_lag = get_bits(gb, ctx->ltp_lag_length);
811 1558 *bd->ltp_lag += FFMAX(4, opt_order + 1);
812 }
813 }
814
815 // read first value and residuals in case of a random access block
816
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 4767 if (bd->ra_block) {
817 698 start = FFMIN(opt_order, 3);
818
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 698 av_assert0(sb_length <= sconf->frame_length);
819
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 698 if (sb_length <= start) {
820 // opt_order or sb_length may be corrupted, either way this is unsupported and not well defined in the specification
821 ✗ av_log(avctx, AV_LOG_ERROR, "Sub block length smaller or equal start\n");
822 ✗ return AVERROR_PATCHWELCOME;
823 }
824
825
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 698 if (opt_order)
826 698 bd->raw_samples[0] = decode_rice(gb, avctx->bits_per_raw_sample - 4);
827
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 698 if (opt_order > 1)
828 698 bd->raw_samples[1] = decode_rice(gb, FFMIN(s[0] + 3, ctx->s_max));
829
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 698 if (opt_order > 2)
830 697 bd->raw_samples[2] = decode_rice(gb, FFMIN(s[0] + 1, ctx->s_max));
831 }
832
833 // read all residuals
834
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 4767 if (sconf->bgmc) {
835 int delta[8];
836 unsigned int k [8];
837 1722 unsigned int b = av_clip((av_ceil_log2(bd->block_length) - 3) >> 1, 0, 5);
838
839 // read most significant bits
840 unsigned int high;
841 unsigned int low;
842 unsigned int value;
843
844 1722 int ret = ff_bgmc_decode_init(gb, &high, &low, &value);
845
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 1722 if (ret < 0)
846 ✗ return ret;
847
848 1722 current_res = bd->raw_samples + start;
849
850
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 4870 for (sb = 0; sb < sub_blocks; sb++) {
851
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 3148 unsigned int sb_len = sb_length - (sb ? 0 : start);
852
853
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 3148 k [sb] = s[sb] > b ? s[sb] - b : 0;
854 3148 delta[sb] = 5 - s[sb] + k[sb];
855
856
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 3148 if (k[sb] >= 32)
857 ✗ return AVERROR_INVALIDDATA;
858
859 3148 ff_bgmc_decode(gb, sb_len, current_res,
860 delta[sb], sx[sb], &high, &low, &value, ctx->bgmc_lut, ctx->bgmc_lut_status);
861
862 3148 current_res += sb_len;
863 }
864
865 1722 ff_bgmc_decode_end(gb);
866
867
868 // read least significant bits and tails
869 1722 current_res = bd->raw_samples + start;
870
871
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 4870 for (sb = 0; sb < sub_blocks; sb++, start = 0) {
872 3148 unsigned int cur_tail_code = tail_code[sx[sb]][delta[sb]];
873 3148 unsigned int cur_k = k[sb];
874 3148 unsigned int cur_s = s[sb];
875
876
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 4584006 for (; start < sb_length; start++) {
877 4580858 int32_t res = *current_res;
878
879
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 4580858 if (res == cur_tail_code) {
880
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 12582 unsigned int max_msb = (2 + (sx[sb] > 2) + (sx[sb] > 10))
881 12582 << (5 - delta[sb]);
882
883 12582 res = decode_rice(gb, cur_s);
884
885
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 12582 if (res >= 0) {
886 6332 res += (max_msb ) << cur_k;
887 } else {
888 6250 res -= (max_msb - 1) << cur_k;
889 }
890 } else {
891
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 4568276 if (res > cur_tail_code)
892 94057 res--;
893
894
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 4568276 if (res & 1)
895 2023961 res = -res;
896
897 4568276 res >>= 1;
898
899
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 4568276 if (cur_k) {
900 866509 res *= 1U << cur_k;
901 866509 res |= get_bits_long(gb, cur_k);
902 }
903 }
904
905 4580858 *current_res++ = res;
906 }
907 }
908 } else {
909 3045 current_res = bd->raw_samples + start;
910
911
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 8370 for (sb = 0; sb < sub_blocks; sb++, start = 0)
912
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 7145090 for (; start < sb_length; start++)
913 7139765 *current_res++ = decode_rice(gb, s[sb]);
914 }
915
916 4767 return 0;
917 }
918
919
920 /** Decode the block data for a non-constant block
921 */
922 4767 static int decode_var_block_data(ALSDecContext *ctx, ALSBlockData *bd)
923 {
924 4767 ALSSpecificConfig *sconf = &ctx->sconf;
925 4767 unsigned int block_length = bd->block_length;
926 4767 unsigned int smp = 0;
927 unsigned int k;
928 4767 int opt_order = *bd->opt_order;
929 int sb;
930 int64_t y;
931 4767 int32_t *quant_cof = bd->quant_cof;
932 4767 int32_t *lpc_cof = bd->lpc_cof;
933 4767 int32_t *raw_samples = bd->raw_samples;
934 4767 int32_t *raw_samples_end = bd->raw_samples + bd->block_length;
935 4767 int32_t *lpc_cof_reversed = ctx->lpc_cof_reversed_buffer;
936
937 // reverse long-term prediction
938
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 4767 if (*bd->use_ltp) {
939 int ltp_smp;
940
941
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 3839287 for (ltp_smp = FFMAX(*bd->ltp_lag - 2, 0); ltp_smp < block_length; ltp_smp++) {
942 3837729 int center = ltp_smp - *bd->ltp_lag;
943 3837729 int begin = FFMAX(0, center - 2);
944 3837729 int end = center + 3;
945 3837729 int tab = 5 - (end - begin);
946 int base;
947
948 3837729 y = 1 << 6;
949
950
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 23010794 for (base = begin; base < end; base++, tab++)
951 19173065 y += (uint64_t)MUL64(bd->ltp_gain[tab], raw_samples[base]);
952
953 3837729 raw_samples[ltp_smp] += y >> 7;
954 }
955 }
956
957 // reconstruct all samples from residuals
958
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 4767 if (bd->ra_block) {
959
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 53993 for (smp = 0; smp < FFMIN(opt_order, block_length); smp++) {
960 53295 y = 1 << 19;
961
962
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 2692325 for (sb = 0; sb < smp; sb++)
963 2639030 y += (uint64_t)MUL64(lpc_cof[sb], raw_samples[-(sb + 1)]);
964
965 53295 *raw_samples++ -= y >> 20;
966 53295 parcor_to_lpc(smp, quant_cof, lpc_cof);
967 }
968 } else {
969
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 88269 for (k = 0; k < opt_order; k++)
970 84200 parcor_to_lpc(k, quant_cof, lpc_cof);
971
972 // store previous samples in case that they have to be altered
973
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 4069 if (*bd->store_prev_samples)
974 9 memcpy(bd->prev_raw_samples, raw_samples - sconf->max_order,
975 9 sizeof(*bd->prev_raw_samples) * sconf->max_order);
976
977 // reconstruct difference signal for prediction (joint-stereo)
978
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 4069 if (bd->js_blocks && bd->raw_other) {
979 uint32_t *left, *right;
980
981
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 9 if (bd->raw_other > raw_samples) { // D = R - L
982 4 left = raw_samples;
983 4 right = bd->raw_other;
984 } else { // D = R - L
985 5 left = bd->raw_other;
986 5 right = raw_samples;
987 }
988
989
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 333 for (sb = -1; sb >= -sconf->max_order; sb--)
990 324 raw_samples[sb] = right[sb] - left[sb];
991 }
992
993 // reconstruct shifted signal
994
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 4069 if (*bd->shift_lsbs)
995 ✗ for (sb = -1; sb >= -sconf->max_order; sb--)
996 ✗ raw_samples[sb] >>= *bd->shift_lsbs;
997 }
998
999 // reverse linear prediction coefficients for efficiency
1000 4767 lpc_cof = lpc_cof + opt_order;
1001
1002
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 142262 for (sb = 0; sb < opt_order; sb++)
1003 137495 lpc_cof_reversed[sb] = lpc_cof[-(sb + 1)];
1004
1005 // reconstruct raw samples
1006 4767 raw_samples = bd->raw_samples + smp;
1007 4767 lpc_cof = lpc_cof_reversed + opt_order;
1008
1009
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 11674188 for (; raw_samples < raw_samples_end; raw_samples++) {
1010 11669421 y = 1 << 19;
1011
1012
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 429242414 for (sb = -opt_order; sb < 0; sb++)
1013 417572993 y += (uint64_t)MUL64(lpc_cof[sb], raw_samples[sb]);
1014
1015 11669421 *raw_samples -= y >> 20;
1016 }
1017
1018 4767 raw_samples = bd->raw_samples;
1019
1020 // restore previous samples in case that they have been altered
1021
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 4767 if (*bd->store_prev_samples)
1022 9 memcpy(raw_samples - sconf->max_order, bd->prev_raw_samples,
1023 9 sizeof(*raw_samples) * sconf->max_order);
1024
1025 4767 return 0;
1026 }
1027
1028
1029 /** Read the block data.
1030 */
1031 4767 static int read_block(ALSDecContext *ctx, ALSBlockData *bd)
1032 {
1033 int ret;
1034 4767 GetBitContext *gb = &ctx->gb;
1035 4767 ALSSpecificConfig *sconf = &ctx->sconf;
1036
1037 4767 *bd->shift_lsbs = 0;
1038
1039
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 4767 if (get_bits_left(gb) < 7)
1040 ✗ return AVERROR_INVALIDDATA;
1041
1042 // read block type flag and read the samples accordingly
1043
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 4767 if (get_bits1(gb)) {
1044 4767 ret = read_var_block_data(ctx, bd);
1045 } else {
1046 ✗ ret = read_const_block_data(ctx, bd);
1047 }
1048
1049
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 4767 if (!sconf->mc_coding || ctx->js_switch)
1050 3045 align_get_bits(gb);
1051
1052 4767 return ret;
1053 }
1054
1055
1056 /** Decode the block data.
1057 */
1058 4767 static int decode_block(ALSDecContext *ctx, ALSBlockData *bd)
1059 {
1060 unsigned int smp;
1061 4767 int ret = 0;
1062
1063 // read block type flag and read the samples accordingly
1064
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 4767 if (*bd->const_block)
1065 ✗ decode_const_block_data(ctx, bd);
1066 else
1067 4767 ret = decode_var_block_data(ctx, bd); // always return 0
1068
1069
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 4767 if (ret < 0)
1070 ✗ return ret;
1071
1072 // TODO: read RLSLMS extension data
1073
1074
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 4767 if (*bd->shift_lsbs)
1075 ✗ for (smp = 0; smp < bd->block_length; smp++)
1076 ✗ bd->raw_samples[smp] = (unsigned)bd->raw_samples[smp] << *bd->shift_lsbs;
1077
1078 4767 return 0;
1079 }
1080
1081
1082 /** Read and decode block data successively.
1083 */
1084 3045 static int read_decode_block(ALSDecContext *ctx, ALSBlockData *bd)
1085 {
1086 int ret;
1087
1088
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 3045 if ((ret = read_block(ctx, bd)) < 0)
1089 ✗ return ret;
1090
1091 3045 return decode_block(ctx, bd);
1092 }
1093
1094
1095 /** Compute the number of samples left to decode for the current frame and
1096 * sets these samples to zero.
1097 */
1098 ✗ static void zero_remaining(unsigned int b, unsigned int b_max,
1099 const unsigned int *div_blocks, int32_t *buf)
1100 {
1101 ✗ unsigned int count = 0;
1102
1103 ✗ while (b < b_max)
1104 ✗ count += div_blocks[b++];
1105
1106 ✗ if (count)
1107 ✗ memset(buf, 0, sizeof(*buf) * count);
1108 ✗ }
1109
1110
1111 /** Decode blocks independently.
1112 */
1113 2138 static int decode_blocks_ind(ALSDecContext *ctx, unsigned int ra_frame,
1114 unsigned int c, const unsigned int *div_blocks,
1115 unsigned int *js_blocks)
1116 {
1117 int ret;
1118 unsigned int b;
1119 2138 ALSBlockData bd = { 0 };
1120
1121 2138 bd.ra_block = ra_frame;
1122 2138 bd.const_block = ctx->const_block;
1123 2138 bd.shift_lsbs = ctx->shift_lsbs;
1124 2138 bd.opt_order = ctx->opt_order;
1125 2138 bd.store_prev_samples = ctx->store_prev_samples;
1126 2138 bd.use_ltp = ctx->use_ltp;
1127 2138 bd.ltp_lag = ctx->ltp_lag;
1128 2138 bd.ltp_gain = ctx->ltp_gain[0];
1129 2138 bd.quant_cof = ctx->quant_cof[0];
1130 2138 bd.lpc_cof = ctx->lpc_cof[0];
1131 2138 bd.prev_raw_samples = ctx->prev_raw_samples;
1132 2138 bd.raw_samples = ctx->raw_samples[c];
1133
1134
1135
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 4317 for (b = 0; b < ctx->num_blocks; b++) {
1136 2179 bd.block_length = div_blocks[b];
1137
1138
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 2179 if ((ret = read_decode_block(ctx, &bd)) < 0) {
1139 // damaged block, write zero for the rest of the frame
1140 ✗ zero_remaining(b, ctx->num_blocks, div_blocks, bd.raw_samples);
1141 ✗ return ret;
1142 }
1143 2179 bd.raw_samples += div_blocks[b];
1144 2179 bd.ra_block = 0;
1145 }
1146
1147 2138 return 0;
1148 }
1149
1150
1151 /** Decode blocks dependently.
1152 */
1153 415 static int decode_blocks(ALSDecContext *ctx, unsigned int ra_frame,
1154 unsigned int c, const unsigned int *div_blocks,
1155 unsigned int *js_blocks)
1156 {
1157 415 ALSSpecificConfig *sconf = &ctx->sconf;
1158 415 unsigned int offset = 0;
1159 unsigned int b;
1160 int ret;
1161 415 ALSBlockData bd[2] = { { 0 } };
1162
1163 415 bd[0].ra_block = ra_frame;
1164 415 bd[0].const_block = ctx->const_block;
1165 415 bd[0].shift_lsbs = ctx->shift_lsbs;
1166 415 bd[0].opt_order = ctx->opt_order;
1167 415 bd[0].store_prev_samples = ctx->store_prev_samples;
1168 415 bd[0].use_ltp = ctx->use_ltp;
1169 415 bd[0].ltp_lag = ctx->ltp_lag;
1170 415 bd[0].ltp_gain = ctx->ltp_gain[0];
1171 415 bd[0].quant_cof = ctx->quant_cof[0];
1172 415 bd[0].lpc_cof = ctx->lpc_cof[0];
1173 415 bd[0].prev_raw_samples = ctx->prev_raw_samples;
1174 415 bd[0].js_blocks = *js_blocks;
1175
1176 415 bd[1].ra_block = ra_frame;
1177 415 bd[1].const_block = ctx->const_block;
1178 415 bd[1].shift_lsbs = ctx->shift_lsbs;
1179 415 bd[1].opt_order = ctx->opt_order;
1180 415 bd[1].store_prev_samples = ctx->store_prev_samples;
1181 415 bd[1].use_ltp = ctx->use_ltp;
1182 415 bd[1].ltp_lag = ctx->ltp_lag;
1183 415 bd[1].ltp_gain = ctx->ltp_gain[0];
1184 415 bd[1].quant_cof = ctx->quant_cof[0];
1185 415 bd[1].lpc_cof = ctx->lpc_cof[0];
1186 415 bd[1].prev_raw_samples = ctx->prev_raw_samples;
1187 415 bd[1].js_blocks = *(js_blocks + 1);
1188
1189 // decode all blocks
1190
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 848 for (b = 0; b < ctx->num_blocks; b++) {
1191 unsigned int s;
1192
1193 433 bd[0].block_length = div_blocks[b];
1194 433 bd[1].block_length = div_blocks[b];
1195
1196 433 bd[0].raw_samples = ctx->raw_samples[c ] + offset;
1197 433 bd[1].raw_samples = ctx->raw_samples[c + 1] + offset;
1198
1199 433 bd[0].raw_other = bd[1].raw_samples;
1200 433 bd[1].raw_other = bd[0].raw_samples;
1201
1202
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 866 if ((ret = read_decode_block(ctx, &bd[0])) < 0 ||
1203 433 (ret = read_decode_block(ctx, &bd[1])) < 0)
1204 ✗ goto fail;
1205
1206 // reconstruct joint-stereo blocks
1207
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 433 if (bd[0].js_blocks) {
1208
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 4 if (bd[1].js_blocks)
1209 ✗ av_log(ctx->avctx, AV_LOG_WARNING, "Invalid channel pair.\n");
1210
1211
2/2
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 16388 for (s = 0; s < div_blocks[b]; s++)
1212 16384 bd[0].raw_samples[s] = bd[1].raw_samples[s] - (unsigned)bd[0].raw_samples[s];
1213
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 429 } else if (bd[1].js_blocks) {
1214
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 10245 for (s = 0; s < div_blocks[b]; s++)
1215 10240 bd[1].raw_samples[s] = bd[1].raw_samples[s] + (unsigned)bd[0].raw_samples[s];
1216 }
1217
1218 433 offset += div_blocks[b];
1219 433 bd[0].ra_block = 0;
1220 433 bd[1].ra_block = 0;
1221 }
1222
1223 // store carryover raw samples,
1224 // the others channel raw samples are stored by the calling function.
1225 415 memmove(ctx->raw_samples[c] - sconf->max_order,
1226 415 ctx->raw_samples[c] - sconf->max_order + sconf->frame_length,
1227 415 sizeof(*ctx->raw_samples[c]) * sconf->max_order);
1228
1229 415 return 0;
1230 ✗ fail:
1231 // damaged block, write zero for the rest of the frame
1232 ✗ zero_remaining(b, ctx->num_blocks, div_blocks, bd[0].raw_samples);
1233 ✗ zero_remaining(b, ctx->num_blocks, div_blocks, bd[1].raw_samples);
1234 ✗ return ret;
1235 }
1236
1237 5721 static inline int als_weighting(GetBitContext *gb, int k, int off)
1238 {
1239 5721 int idx = av_clip(decode_rice(gb, k) + off,
1240 0, FF_ARRAY_ELEMS(mcc_weightings) - 1);
1241 5721 return mcc_weightings[idx];
1242 }
1243
1244 /** Read the channel data.
1245 */
1246 1722 static int read_channel_data(ALSDecContext *ctx, ALSChannelData *cd, int c)
1247 {
1248 1722 GetBitContext *gb = &ctx->gb;
1249 1722 ALSChannelData *current = cd;
1250 1722 unsigned int channels = ctx->avctx->ch_layout.nb_channels;
1251 1722 int entries = 0;
1252
1253
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 2948 while (entries < channels && !(current->stop_flag = get_bits1(gb))) {
1254 1226 current->master_channel = get_bits_long(gb, av_ceil_log2(channels));
1255
1256
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 1226 if (current->master_channel >= channels) {
1257 ✗ av_log(ctx->avctx, AV_LOG_ERROR, "Invalid master channel.\n");
1258 ✗ return AVERROR_INVALIDDATA;
1259 }
1260
1261
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✗ Branch 1 not taken.
 1226 if (current->master_channel != c) {
1262 1226 current->time_diff_flag = get_bits1(gb);
1263 1226 current->weighting[0] = als_weighting(gb, 1, 16);
1264 1226 current->weighting[1] = als_weighting(gb, 2, 14);
1265 1226 current->weighting[2] = als_weighting(gb, 1, 16);
1266
1267
2/2
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 1226 if (current->time_diff_flag) {
1268 681 current->weighting[3] = als_weighting(gb, 1, 16);
1269 681 current->weighting[4] = als_weighting(gb, 1, 16);
1270 681 current->weighting[5] = als_weighting(gb, 1, 16);
1271
1272 681 current->time_diff_sign = get_bits1(gb);
1273 681 current->time_diff_index = get_bits(gb, ctx->ltp_lag_length - 3) + 3;
1274 }
1275 }
1276
1277 1226 current++;
1278 1226 entries++;
1279 }
1280
1281
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 1722 if (entries == channels) {
1282 ✗ av_log(ctx->avctx, AV_LOG_ERROR, "Damaged channel data.\n");
1283 ✗ return AVERROR_INVALIDDATA;
1284 }
1285
1286 1722 align_get_bits(gb);
1287 1722 return 0;
1288 }
1289
1290
1291 /** Recursively reverts the inter-channel correlation for a block.
1292 */
1293 2948 static int revert_channel_correlation(ALSDecContext *ctx, ALSBlockData *bd,
1294 ALSChannelData **cd, int *reverted,
1295 unsigned int offset, int c)
1296 {
1297 2948 ALSChannelData *ch = cd[c];
1298 2948 unsigned int dep = 0;
1299 2948 unsigned int channels = ctx->avctx->ch_layout.nb_channels;
1300 2948 unsigned int channel_size = ctx->sconf.frame_length + ctx->sconf.max_order;
1301
1302
2/2
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 2948 if (reverted[c])
1303 1226 return 0;
1304
1305 1722 reverted[c] = 1;
1306
1307
3/4
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✓ Branch 2 taken 1226 times.
✓ Branch 3 taken 1722 times.
 2948 while (dep < channels && !ch[dep].stop_flag) {
1308 1226 revert_channel_correlation(ctx, bd, cd, reverted, offset,
1309 1226 ch[dep].master_channel);
1310
1311 1226 dep++;
1312 }
1313
1314
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 1722 if (dep == channels) {
1315 ✗ av_log(ctx->avctx, AV_LOG_WARNING, "Invalid channel correlation.\n");
1316 ✗ return AVERROR_INVALIDDATA;
1317 }
1318
1319 1722 bd->const_block = ctx->const_block + c;
1320 1722 bd->shift_lsbs = ctx->shift_lsbs + c;
1321 1722 bd->opt_order = ctx->opt_order + c;
1322 1722 bd->store_prev_samples = ctx->store_prev_samples + c;
1323 1722 bd->use_ltp = ctx->use_ltp + c;
1324 1722 bd->ltp_lag = ctx->ltp_lag + c;
1325 1722 bd->ltp_gain = ctx->ltp_gain[c];
1326 1722 bd->lpc_cof = ctx->lpc_cof[c];
1327 1722 bd->quant_cof = ctx->quant_cof[c];
1328 1722 bd->raw_samples = ctx->raw_samples[c] + offset;
1329
1330
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 2948 for (dep = 0; !ch[dep].stop_flag; dep++) {
1331 ptrdiff_t smp;
1332 1226 ptrdiff_t begin = 1;
1333 1226 ptrdiff_t end = bd->block_length - 1;
1334 int64_t y;
1335 1226 int32_t *master = ctx->raw_samples[ch[dep].master_channel] + offset;
1336
1337
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 1226 if (ch[dep].master_channel == c)
1338 ✗ continue;
1339
1340
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 1226 if (ch[dep].time_diff_flag) {
1341 681 int t = ch[dep].time_diff_index;
1342
1343
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✓ Branch 1 taken 368 times.
 681 if (ch[dep].time_diff_sign) {
1344 313 t = -t;
1345
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 313 if (begin < t) {
1346 ✗ av_log(ctx->avctx, AV_LOG_ERROR, "begin %"PTRDIFF_SPECIFIER" smaller than time diff index %d.\n", begin, t);
1347 ✗ return AVERROR_INVALIDDATA;
1348 }
1349 313 begin -= t;
1350 } else {
1351
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 368 if (end < t) {
1352 ✗ av_log(ctx->avctx, AV_LOG_ERROR, "end %"PTRDIFF_SPECIFIER" smaller than time diff index %d.\n", end, t);
1353 ✗ return AVERROR_INVALIDDATA;
1354 }
1355 368 end -= t;
1356 }
1357
1358
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✗ Branch 3 not taken.
 681 if (FFMIN(begin - 1, begin - 1 + t) < ctx->raw_buffer - master ||
1359
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✗ Branch 2 not taken.
✓ Branch 3 taken 681 times.
 681 FFMAX(end + 1, end + 1 + t) > ctx->raw_buffer + channels * channel_size - master) {
1360 ✗ av_log(ctx->avctx, AV_LOG_ERROR,
1361 "sample pointer range [%p, %p] not contained in raw_buffer [%p, %p].\n",
1362 ✗ master + FFMIN(begin - 1, begin - 1 + t), master + FFMAX(end + 1, end + 1 + t),
1363 ✗ ctx->raw_buffer, ctx->raw_buffer + channels * channel_size);
1364 ✗ return AVERROR_INVALIDDATA;
1365 }
1366
1367
2/2
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 1845643 for (smp = begin; smp < end; smp++) {
1368 1844962 y = (1 << 6) +
1369 1844962 MUL64(ch[dep].weighting[0], master[smp - 1 ]) +
1370 1844962 MUL64(ch[dep].weighting[1], master[smp ]) +
1371 1844962 MUL64(ch[dep].weighting[2], master[smp + 1 ]) +
1372 1844962 MUL64(ch[dep].weighting[3], master[smp - 1 + t]) +
1373 1844962 MUL64(ch[dep].weighting[4], master[smp + t]) +
1374 1844962 MUL64(ch[dep].weighting[5], master[smp + 1 + t]);
1375
1376 1844962 bd->raw_samples[smp] += y >> 7;
1377 }
1378 } else {
1379
1380
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 545 if (begin - 1 < ctx->raw_buffer - master ||
1381
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 545 end + 1 > ctx->raw_buffer + channels * channel_size - master) {
1382 ✗ av_log(ctx->avctx, AV_LOG_ERROR,
1383 "sample pointer range [%p, %p] not contained in raw_buffer [%p, %p].\n",
1384 ✗ master + begin - 1, master + end + 1,
1385 ✗ ctx->raw_buffer, ctx->raw_buffer + channels * channel_size);
1386 ✗ return AVERROR_INVALIDDATA;
1387 }
1388
1389
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 1568069 for (smp = begin; smp < end; smp++) {
1390 1567524 y = (1 << 6) +
1391 1567524 MUL64(ch[dep].weighting[0], master[smp - 1]) +
1392 1567524 MUL64(ch[dep].weighting[1], master[smp ]) +
1393 1567524 MUL64(ch[dep].weighting[2], master[smp + 1]);
1394
1395 1567524 bd->raw_samples[smp] += y >> 7;
1396 }
1397 }
1398 }
1399
1400 1722 return 0;
1401 }
1402
1403
1404 /** multiply two softfloats and handle the rounding off
1405 */
1406 ✗ static SoftFloat_IEEE754 multiply(SoftFloat_IEEE754 a, SoftFloat_IEEE754 b) {
1407 uint64_t mantissa_temp;
1408 uint64_t mask_64;
1409 int cutoff_bit_count;
1410 unsigned char last_2_bits;
1411 unsigned int mantissa;
1412 int32_t sign;
1413 ✗ uint32_t return_val = 0;
1414 ✗ int bit_count = 48;
1415
1416 ✗ sign = a.sign ^ b.sign;
1417
1418 // Multiply mantissa bits in a 64-bit register
1419 ✗ mantissa_temp = (uint64_t)a.mant * (uint64_t)b.mant;
1420 ✗ mask_64 = (uint64_t)0x1 << 47;
1421
1422 ✗ if (!mantissa_temp)
1423 ✗ return FLOAT_0;
1424
1425 // Count the valid bit count
1426 ✗ while (!(mantissa_temp & mask_64) && mask_64) {
1427 ✗ bit_count--;
1428 ✗ mask_64 >>= 1;
1429 }
1430
1431 // Round off
1432 ✗ cutoff_bit_count = bit_count - 24;
1433 ✗ if (cutoff_bit_count > 0) {
1434 ✗ last_2_bits = (unsigned char)(((unsigned int)mantissa_temp >> (cutoff_bit_count - 1)) & 0x3 );
1435 ✗ if ((last_2_bits == 0x3) || ((last_2_bits == 0x1) && ((unsigned int)mantissa_temp & ((0x1UL << (cutoff_bit_count - 1)) - 1)))) {
1436 // Need to round up
1437 ✗ mantissa_temp += (uint64_t)0x1 << cutoff_bit_count;
1438 }
1439 }
1440
1441 ✗ if (cutoff_bit_count >= 0) {
1442 ✗ mantissa = (unsigned int)(mantissa_temp >> cutoff_bit_count);
1443 } else {
1444 ✗ mantissa = (unsigned int)(mantissa_temp <<-cutoff_bit_count);
1445 }
1446
1447 // Need one more shift?
1448 ✗ if (mantissa & 0x01000000ul) {
1449 ✗ bit_count++;
1450 ✗ mantissa >>= 1;
1451 }
1452
1453 ✗ if (!sign) {
1454 ✗ return_val = 0x80000000U;
1455 }
1456
1457 ✗ return_val |= ((unsigned)av_clip(a.exp + b.exp + bit_count - 47, -126, 127) << 23) & 0x7F800000;
1458 ✗ return_val |= mantissa;
1459 ✗ return av_bits2sf_ieee754(return_val);
1460 }
1461
1462
1463 /** Read and decode the floating point sample data
1464 */
1465 ✗ static int read_diff_float_data(ALSDecContext *ctx, unsigned int ra_frame) {
1466 ✗ AVCodecContext *avctx = ctx->avctx;
1467 ✗ GetBitContext *gb = &ctx->gb;
1468 ✗ SoftFloat_IEEE754 *acf = ctx->acf;
1469 ✗ int *shift_value = ctx->shift_value;
1470 ✗ int *last_shift_value = ctx->last_shift_value;
1471 ✗ int *last_acf_mantissa = ctx->last_acf_mantissa;
1472 ✗ int **raw_mantissa = ctx->raw_mantissa;
1473 ✗ int *nbits = ctx->nbits;
1474 ✗ unsigned char *larray = ctx->larray;
1475 ✗ int frame_length = ctx->cur_frame_length;
1476 ✗ SoftFloat_IEEE754 scale = av_int2sf_ieee754(0x1u, 23);
1477 unsigned int partA_flag;
1478 unsigned int highest_byte;
1479 unsigned int shift_amp;
1480 uint32_t tmp_32;
1481 int use_acf;
1482 int nchars;
1483 int i;
1484 int c;
1485 long k;
1486 long nbits_aligned;
1487 unsigned long acc;
1488 unsigned long j;
1489 uint32_t sign;
1490 uint32_t e;
1491 uint32_t mantissa;
1492
1493 ✗ skip_bits_long(gb, 32); //num_bytes_diff_float
1494 ✗ use_acf = get_bits1(gb);
1495
1496 ✗ if (ra_frame) {
1497 ✗ memset(last_acf_mantissa, 0, avctx->ch_layout.nb_channels * sizeof(*last_acf_mantissa));
1498 ✗ memset(last_shift_value, 0, avctx->ch_layout.nb_channels * sizeof(*last_shift_value) );
1499 ✗ ff_mlz_flush_dict(ctx->mlz);
1500 }
1501
1502 ✗ if (avctx->ch_layout.nb_channels * 8 > get_bits_left(gb))
1503 ✗ return AVERROR_INVALIDDATA;
1504
1505 ✗ for (c = 0; c < avctx->ch_layout.nb_channels; ++c) {
1506 ✗ if (use_acf) {
1507 //acf_flag
1508 ✗ if (get_bits1(gb)) {
1509 ✗ tmp_32 = get_bits(gb, 23);
1510 ✗ last_acf_mantissa[c] = tmp_32;
1511 } else {
1512 ✗ tmp_32 = last_acf_mantissa[c];
1513 }
1514 ✗ acf[c] = av_bits2sf_ieee754(tmp_32);
1515 } else {
1516 ✗ acf[c] = FLOAT_1;
1517 }
1518
1519 ✗ highest_byte = get_bits(gb, 2);
1520 ✗ partA_flag = get_bits1(gb);
1521 ✗ shift_amp = get_bits1(gb);
1522
1523 ✗ if (shift_amp) {
1524 ✗ shift_value[c] = get_bits(gb, 8);
1525 ✗ last_shift_value[c] = shift_value[c];
1526 } else {
1527 ✗ shift_value[c] = last_shift_value[c];
1528 }
1529
1530 ✗ if (partA_flag) {
1531 ✗ if (!get_bits1(gb)) { //uncompressed
1532 ✗ for (i = 0; i < frame_length; ++i) {
1533 ✗ if (ctx->raw_samples[c][i] == 0) {
1534 ✗ ctx->raw_mantissa[c][i] = get_bits_long(gb, 32);
1535 }
1536 }
1537 } else { //compressed
1538 ✗ nchars = 0;
1539 ✗ for (i = 0; i < frame_length; ++i) {
1540 ✗ if (ctx->raw_samples[c][i] == 0) {
1541 ✗ nchars += 4;
1542 }
1543 }
1544
1545 ✗ tmp_32 = ff_mlz_decompression(ctx->mlz, gb, nchars, larray);
1546 ✗ if(tmp_32 != nchars) {
1547 ✗ av_log(ctx->avctx, AV_LOG_ERROR, "Error in MLZ decompression (%"PRId32", %d).\n", tmp_32, nchars);
1548 ✗ return AVERROR_INVALIDDATA;
1549 }
1550
1551 ✗ for (i = 0; i < frame_length; ++i) {
1552 ✗ ctx->raw_mantissa[c][i] = AV_RB32(larray);
1553 }
1554 }
1555 }
1556
1557 //decode part B
1558 ✗ if (highest_byte) {
1559 ✗ for (i = 0; i < frame_length; ++i) {
1560 ✗ if (ctx->raw_samples[c][i] != 0) {
1561 //The following logic is taken from Tabel 14.45 and 14.46 from the ISO spec
1562 ✗ if (av_cmp_sf_ieee754(acf[c], FLOAT_1)) {
1563 ✗ nbits[i] = 23 - av_log2(abs(ctx->raw_samples[c][i]));
1564 } else {
1565 ✗ nbits[i] = 23;
1566 }
1567 ✗ nbits[i] = FFMIN(nbits[i], highest_byte*8);
1568 }
1569 }
1570
1571 ✗ if (!get_bits1(gb)) { //uncompressed
1572 ✗ for (i = 0; i < frame_length; ++i) {
1573 ✗ if (ctx->raw_samples[c][i] != 0) {
1574 ✗ raw_mantissa[c][i] = get_bitsz(gb, nbits[i]);
1575 }
1576 }
1577 } else { //compressed
1578 ✗ nchars = 0;
1579 ✗ for (i = 0; i < frame_length; ++i) {
1580 ✗ if (ctx->raw_samples[c][i]) {
1581 ✗ nchars += (int) nbits[i] / 8;
1582 ✗ if (nbits[i] & 7) {
1583 ✗ ++nchars;
1584 }
1585 }
1586 }
1587
1588 ✗ tmp_32 = ff_mlz_decompression(ctx->mlz, gb, nchars, larray);
1589 ✗ if(tmp_32 != nchars) {
1590 ✗ av_log(ctx->avctx, AV_LOG_ERROR, "Error in MLZ decompression (%"PRId32", %d).\n", tmp_32, nchars);
1591 ✗ return AVERROR_INVALIDDATA;
1592 }
1593
1594 ✗ j = 0;
1595 ✗ for (i = 0; i < frame_length; ++i) {
1596 ✗ if (ctx->raw_samples[c][i]) {
1597 ✗ if (nbits[i] & 7) {
1598 ✗ nbits_aligned = 8 * ((unsigned int)(nbits[i] / 8) + 1);
1599 } else {
1600 ✗ nbits_aligned = nbits[i];
1601 }
1602 ✗ acc = 0;
1603 ✗ for (k = 0; k < nbits_aligned/8; ++k) {
1604 ✗ acc = (acc << 8) + larray[j++];
1605 }
1606 ✗ acc >>= (nbits_aligned - nbits[i]);
1607 ✗ raw_mantissa[c][i] = acc;
1608 }
1609 }
1610 }
1611 }
1612
1613 ✗ for (i = 0; i < frame_length; ++i) {
1614 ✗ SoftFloat_IEEE754 pcm_sf = av_int2sf_ieee754(ctx->raw_samples[c][i], 0);
1615 ✗ pcm_sf = av_div_sf_ieee754(pcm_sf, scale);
1616
1617 ✗ if (ctx->raw_samples[c][i] != 0) {
1618 ✗ if (!av_cmp_sf_ieee754(acf[c], FLOAT_1)) {
1619 ✗ pcm_sf = multiply(acf[c], pcm_sf);
1620 }
1621
1622 ✗ sign = pcm_sf.sign;
1623 ✗ e = pcm_sf.exp;
1624 ✗ mantissa = (pcm_sf.mant | 0x800000) + raw_mantissa[c][i];
1625
1626 ✗ while(mantissa >= 0x1000000) {
1627 ✗ e++;
1628 ✗ mantissa >>= 1;
1629 }
1630
1631 ✗ if (mantissa) e += (shift_value[c] - 127);
1632 ✗ mantissa &= 0x007fffffUL;
1633
1634 ✗ tmp_32 = (sign << 31) | ((e + EXP_BIAS) << 23) | (mantissa);
1635 ✗ ctx->raw_samples[c][i] = tmp_32;
1636 } else {
1637 ✗ ctx->raw_samples[c][i] = raw_mantissa[c][i] & 0x007fffffUL;
1638 }
1639 }
1640 ✗ align_get_bits(gb);
1641 }
1642 ✗ return 0;
1643 }
1644
1645
1646 /** Read the frame data.
1647 */
1648 1835 static int read_frame_data(ALSDecContext *ctx, unsigned int ra_frame)
1649 {
1650 1835 ALSSpecificConfig *sconf = &ctx->sconf;
1651 1835 AVCodecContext *avctx = ctx->avctx;
1652 1835 GetBitContext *gb = &ctx->gb;
1653 unsigned int div_blocks[32]; ///< block sizes.
1654 int c;
1655 unsigned int js_blocks[2];
1656 1835 int channels = avctx->ch_layout.nb_channels;
1657 1835 uint32_t bs_info = 0;
1658 int ret;
1659
1660 // skip the size of the ra unit if present in the frame
1661
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 1835 if (sconf->ra_flag == RA_FLAG_FRAMES && ra_frame)
1662 ✗ skip_bits_long(gb, 32);
1663
1664
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 1835 if (sconf->mc_coding && sconf->joint_stereo) {
1665 2 ctx->js_switch = get_bits1(gb);
1666 2 align_get_bits(gb);
1667 }
1668
1669
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 3319 if (!sconf->mc_coding || ctx->js_switch) {
1670 1484 int independent_bs = !sconf->joint_stereo;
1671
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 1484 if (get_bits_left(gb) < 7*channels*ctx->num_blocks)
1672 ✗ return AVERROR_INVALIDDATA;
1673
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 4037 for (c = 0; c < channels; c++) {
1674 2553 js_blocks[0] = 0;
1675 2553 js_blocks[1] = 0;
1676
1677 2553 get_block_sizes(ctx, div_blocks, &bs_info);
1678
1679 // if joint_stereo and block_switching is set, independent decoding
1680 // is signaled via the first bit of bs_info
1681
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 2553 if (sconf->joint_stereo && sconf->block_switching)
1682
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 110 if (bs_info >> 31)
1683 22 independent_bs = 2;
1684
1685 // if this is the last channel, it has to be decoded independently
1686
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 2553 if (c == channels - 1 || (c & 1))
1687 1069 independent_bs = 1;
1688
1689
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 2553 if (independent_bs) {
1690 2138 ret = decode_blocks_ind(ctx, ra_frame, c,
1691 div_blocks, js_blocks);
1692
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 2138 if (ret < 0)
1693 ✗ return ret;
1694 2138 independent_bs--;
1695 } else {
1696 415 ret = decode_blocks(ctx, ra_frame, c, div_blocks, js_blocks);
1697
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 415 if (ret < 0)
1698 ✗ return ret;
1699
1700 415 c++;
1701 }
1702
1703 // store carryover raw samples
1704 2553 memmove(ctx->raw_samples[c] - sconf->max_order,
1705 2553 ctx->raw_samples[c] - sconf->max_order + sconf->frame_length,
1706 2553 sizeof(*ctx->raw_samples[c]) * sconf->max_order);
1707 2553 ctx->highest_decoded_channel = c;
1708 }
1709 } else { // multi-channel coding
1710 351 ALSBlockData bd = { 0 };
1711 int b, ret;
1712 351 int *reverted_channels = ctx->reverted_channels;
1713 351 unsigned int offset = 0;
1714
1715
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 2073 for (c = 0; c < channels; c++)
1716
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 1722 if (ctx->chan_data[c] < ctx->chan_data_buffer) {
1717 ✗ av_log(ctx->avctx, AV_LOG_ERROR, "Invalid channel data.\n");
1718 ✗ return AVERROR_INVALIDDATA;
1719 }
1720
1721 351 memset(reverted_channels, 0, sizeof(*reverted_channels) * channels);
1722
1723 351 bd.ra_block = ra_frame;
1724 351 bd.prev_raw_samples = ctx->prev_raw_samples;
1725
1726 351 get_block_sizes(ctx, div_blocks, &bs_info);
1727
1728
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 702 for (b = 0; b < ctx->num_blocks; b++) {
1729 351 bd.block_length = div_blocks[b];
1730
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 351 if (bd.block_length <= 0) {
1731 ✗ av_log(ctx->avctx, AV_LOG_WARNING,
1732 "Invalid block length %u in channel data!\n",
1733 bd.block_length);
1734 ✗ continue;
1735 }
1736
1737
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 2073 for (c = 0; c < channels; c++) {
1738 1722 bd.const_block = ctx->const_block + c;
1739 1722 bd.shift_lsbs = ctx->shift_lsbs + c;
1740 1722 bd.opt_order = ctx->opt_order + c;
1741 1722 bd.store_prev_samples = ctx->store_prev_samples + c;
1742 1722 bd.use_ltp = ctx->use_ltp + c;
1743 1722 bd.ltp_lag = ctx->ltp_lag + c;
1744 1722 bd.ltp_gain = ctx->ltp_gain[c];
1745 1722 bd.lpc_cof = ctx->lpc_cof[c];
1746 1722 bd.quant_cof = ctx->quant_cof[c];
1747 1722 bd.raw_samples = ctx->raw_samples[c] + offset;
1748 1722 bd.raw_other = NULL;
1749
1750
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 1722 if ((ret = read_block(ctx, &bd)) < 0)
1751 ✗ return ret;
1752
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 1722 if ((ret = read_channel_data(ctx, ctx->chan_data[c], c)) < 0)
1753 ✗ return ret;
1754 }
1755
1756
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 2073 for (c = 0; c < channels; c++) {
1757 1722 ret = revert_channel_correlation(ctx, &bd, ctx->chan_data,
1758 reverted_channels, offset, c);
1759
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 1722 if (ret < 0)
1760 ✗ return ret;
1761 }
1762
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 2073 for (c = 0; c < channels; c++) {
1763 1722 bd.const_block = ctx->const_block + c;
1764 1722 bd.shift_lsbs = ctx->shift_lsbs + c;
1765 1722 bd.opt_order = ctx->opt_order + c;
1766 1722 bd.store_prev_samples = ctx->store_prev_samples + c;
1767 1722 bd.use_ltp = ctx->use_ltp + c;
1768 1722 bd.ltp_lag = ctx->ltp_lag + c;
1769 1722 bd.ltp_gain = ctx->ltp_gain[c];
1770 1722 bd.lpc_cof = ctx->lpc_cof[c];
1771 1722 bd.quant_cof = ctx->quant_cof[c];
1772 1722 bd.raw_samples = ctx->raw_samples[c] + offset;
1773
1774
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 1722 if ((ret = decode_block(ctx, &bd)) < 0)
1775 ✗ return ret;
1776
1777 1722 ctx->highest_decoded_channel = FFMAX(ctx->highest_decoded_channel, c);
1778 }
1779
1780 351 memset(reverted_channels, 0, channels * sizeof(*reverted_channels));
1781 351 offset += div_blocks[b];
1782 351 bd.ra_block = 0;
1783 }
1784
1785 // store carryover raw samples
1786
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 2073 for (c = 0; c < channels; c++)
1787 1722 memmove(ctx->raw_samples[c] - sconf->max_order,
1788 1722 ctx->raw_samples[c] - sconf->max_order + sconf->frame_length,
1789 1722 sizeof(*ctx->raw_samples[c]) * sconf->max_order);
1790 }
1791
1792
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 1835 if (sconf->floating) {
1793 ✗ read_diff_float_data(ctx, ra_frame);
1794 }
1795
1796
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 1835 if (get_bits_left(gb) < 0) {
1797 ✗ av_log(ctx->avctx, AV_LOG_ERROR, "Overread %d\n", -get_bits_left(gb));
1798 ✗ return AVERROR_INVALIDDATA;
1799 }
1800
1801 1835 return 0;
1802 }
1803
1804
1805 /** Decode an ALS frame.
1806 */
1807 1835 static int decode_frame(AVCodecContext *avctx, AVFrame *frame,
1808 int *got_frame_ptr, AVPacket *avpkt)
1809 {
1810 1835 ALSDecContext *ctx = avctx->priv_data;
1811 1835 ALSSpecificConfig *sconf = &ctx->sconf;
1812 1835 const uint8_t *buffer = avpkt->data;
1813 1835 int buffer_size = avpkt->size;
1814 int invalid_frame, ret;
1815 1835 int channels = avctx->ch_layout.nb_channels;
1816 unsigned int c, sample, ra_frame, bytes_read, shift;
1817
1818
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 1835 if ((ret = init_get_bits8(&ctx->gb, buffer, buffer_size)) < 0)
1819 ✗ return ret;
1820
1821 // In the case that the distance between random access frames is set to zero
1822 // (sconf->ra_distance == 0) no frame is treated as a random access frame.
1823 // For the first frame, if prediction is used, all samples used from the
1824 // previous frame are assumed to be zero.
1825
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 1835 ra_frame = sconf->ra_distance && !(ctx->frame_id % sconf->ra_distance);
1826
1827 // the last frame to decode might have a different length
1828
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 1835 if (sconf->samples != 0xFFFFFFFF)
1829 1835 ctx->cur_frame_length = FFMIN(sconf->samples - ctx->frame_id * (uint64_t) sconf->frame_length,
1830 sconf->frame_length);
1831 else
1832 ✗ ctx->cur_frame_length = sconf->frame_length;
1833
1834 1835 ctx->highest_decoded_channel = -1;
1835 // decode the frame data
1836
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 1835 if ((invalid_frame = read_frame_data(ctx, ra_frame)) < 0)
1837 ✗ av_log(ctx->avctx, AV_LOG_WARNING,
1838 "Reading frame data failed. Skipping RA unit.\n");
1839
1840
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 1835 if (ctx->highest_decoded_channel == -1) {
1841 ✗ av_log(ctx->avctx, AV_LOG_WARNING,
1842 "No channel data decoded.\n");
1843 ✗ return AVERROR_INVALIDDATA;
1844 }
1845
1846 1835 ctx->frame_id++;
1847
1848 /* get output buffer */
1849 1835 frame->nb_samples = ctx->cur_frame_length;
1850
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 1835 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
1851 ✗ return ret;
1852
1853 // transform decoded frame into output format
1854 #define INTERLEAVE_OUTPUT(bps) \
1855 { \
1856 int##bps##_t *dest = (int##bps##_t*)frame->data[0]; \
1857 int32_t *raw_samples = ctx->raw_samples[0]; \
1858 int raw_step = channels > 1 ? ctx->raw_samples[1] - raw_samples : 1; \
1859 shift = bps - ctx->avctx->bits_per_raw_sample; \
1860 if (!ctx->cs_switch) { \
1861 for (sample = 0; sample < ctx->cur_frame_length; sample++) \
1862 for (c = 0; c < channels; c++) \
1863 *dest++ = raw_samples[c*raw_step + sample] * (1U << shift); \
1864 } else { \
1865 for (sample = 0; sample < ctx->cur_frame_length; sample++) \
1866 for (c = 0; c < channels; c++) \
1867 *dest++ = raw_samples[sconf->chan_pos[c]*raw_step + sample] * (1U << shift);\
1868 } \
1869 }
1870
1871
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 1835 if (ctx->avctx->bits_per_raw_sample <= 16) {
1872
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 16014599 INTERLEAVE_OUTPUT(16)
1873 } else {
1874 ✗ INTERLEAVE_OUTPUT(32)
1875 }
1876
1877 // update CRC
1878
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 1835 if (sconf->crc_enabled && (avctx->err_recognition & (AV_EF_CRCCHECK|AV_EF_CAREFUL))) {
1879 ✗ int swap = HAVE_BIGENDIAN != sconf->msb_first;
1880
1881 ✗ if (ctx->avctx->bits_per_raw_sample == 24) {
1882 ✗ int32_t *src = (int32_t *)frame->data[0];
1883
1884 ✗ for (sample = 0;
1885 ✗ sample < ctx->cur_frame_length * channels;
1886 ✗ sample++) {
1887 int32_t v;
1888
1889 ✗ if (swap)
1890 ✗ v = av_bswap32(src[sample]);
1891 else
1892 ✗ v = src[sample];
1893 if (!HAVE_BIGENDIAN)
1894 ✗ v >>= 8;
1895
1896 ✗ ctx->crc = av_crc(ctx->crc_table, ctx->crc, (uint8_t*)(&v), 3);
1897 }
1898 } else {
1899 uint8_t *crc_source;
1900
1901 ✗ if (swap) {
1902 ✗ if (ctx->avctx->bits_per_raw_sample <= 16) {
1903 ✗ int16_t *src = (int16_t*) frame->data[0];
1904 ✗ int16_t *dest = (int16_t*) ctx->crc_buffer;
1905 ✗ for (sample = 0;
1906 ✗ sample < ctx->cur_frame_length * channels;
1907 ✗ sample++)
1908 ✗ *dest++ = av_bswap16(src[sample]);
1909 } else {
1910 ✗ ctx->bdsp.bswap_buf((uint32_t *) ctx->crc_buffer,
1911 ✗ (uint32_t *) frame->data[0],
1912 ✗ ctx->cur_frame_length * channels);
1913 }
1914 ✗ crc_source = ctx->crc_buffer;
1915 } else {
1916 ✗ crc_source = frame->data[0];
1917 }
1918
1919 ✗ ctx->crc = av_crc(ctx->crc_table, ctx->crc, crc_source,
1920 ✗ ctx->cur_frame_length * channels *
1921 ✗ av_get_bytes_per_sample(avctx->sample_fmt));
1922 }
1923
1924
1925 // check CRC sums if this is the last frame
1926 ✗ if (ctx->cur_frame_length != sconf->frame_length &&
1927 ✗ ctx->crc_org != ctx->crc) {
1928 ✗ av_log(avctx, AV_LOG_ERROR, "CRC error.\n");
1929 ✗ if (avctx->err_recognition & AV_EF_EXPLODE)
1930 ✗ return AVERROR_INVALIDDATA;
1931 }
1932 }
1933
1934 1835 *got_frame_ptr = 1;
1935
1936
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 1835 bytes_read = invalid_frame ? buffer_size :
1937 1835 (get_bits_count(&ctx->gb) + 7) >> 3;
1938
1939 1835 return bytes_read;
1940 }
1941
1942
1943 /** Uninitialize the ALS decoder.
1944 */
1945 14 static av_cold int decode_end(AVCodecContext *avctx)
1946 {
1947 14 ALSDecContext *ctx = avctx->priv_data;
1948 int i;
1949
1950 14 av_freep(&ctx->sconf.chan_pos);
1951
1952 14 ff_bgmc_end(&ctx->bgmc_lut, &ctx->bgmc_lut_status);
1953
1954 14 av_freep(&ctx->const_block);
1955 14 av_freep(&ctx->shift_lsbs);
1956 14 av_freep(&ctx->opt_order);
1957 14 av_freep(&ctx->store_prev_samples);
1958 14 av_freep(&ctx->use_ltp);
1959 14 av_freep(&ctx->ltp_lag);
1960 14 av_freep(&ctx->ltp_gain);
1961 14 av_freep(&ctx->ltp_gain_buffer);
1962 14 av_freep(&ctx->quant_cof);
1963 14 av_freep(&ctx->lpc_cof);
1964 14 av_freep(&ctx->quant_cof_buffer);
1965 14 av_freep(&ctx->lpc_cof_buffer);
1966 14 av_freep(&ctx->lpc_cof_reversed_buffer);
1967 14 av_freep(&ctx->prev_raw_samples);
1968 14 av_freep(&ctx->raw_samples);
1969 14 av_freep(&ctx->raw_buffer);
1970 14 av_freep(&ctx->chan_data);
1971 14 av_freep(&ctx->chan_data_buffer);
1972 14 av_freep(&ctx->reverted_channels);
1973 14 av_freep(&ctx->crc_buffer);
1974
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 14 if (ctx->mlz) {
1975 ✗ av_freep(&ctx->mlz->dict);
1976 ✗ av_freep(&ctx->mlz);
1977 }
1978 14 av_freep(&ctx->acf);
1979 14 av_freep(&ctx->last_acf_mantissa);
1980 14 av_freep(&ctx->shift_value);
1981 14 av_freep(&ctx->last_shift_value);
1982
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 14 if (ctx->raw_mantissa) {
1983 ✗ for (i = 0; i < avctx->ch_layout.nb_channels; i++) {
1984 ✗ av_freep(&ctx->raw_mantissa[i]);
1985 }
1986 ✗ av_freep(&ctx->raw_mantissa);
1987 }
1988 14 av_freep(&ctx->larray);
1989 14 av_freep(&ctx->nbits);
1990
1991 14 return 0;
1992 }
1993
1994
1995 /** Initialize the ALS decoder.
1996 */
1997 14 static av_cold int decode_init(AVCodecContext *avctx)
1998 {
1999 unsigned int c;
2000 unsigned int channel_size;
2001 int num_buffers, ret;
2002 int channels;
2003 14 ALSDecContext *ctx = avctx->priv_data;
2004 14 ALSSpecificConfig *sconf = &ctx->sconf;
2005 14 ctx->avctx = avctx;
2006
2007
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 14 if (!avctx->extradata) {
2008 ✗ av_log(avctx, AV_LOG_ERROR, "Missing required ALS extradata.\n");
2009 ✗ return AVERROR_INVALIDDATA;
2010 }
2011
2012
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 14 if ((ret = read_specific_config(ctx)) < 0) {
2013 ✗ av_log(avctx, AV_LOG_ERROR, "Reading ALSSpecificConfig failed.\n");
2014 ✗ return ret;
2015 }
2016 14 channels = avctx->ch_layout.nb_channels;
2017
2018
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 14 if ((ret = check_specific_config(ctx)) < 0) {
2019 ✗ return ret;
2020 }
2021
2022
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 14 if (sconf->bgmc) {
2023 4 ret = ff_bgmc_init(avctx, &ctx->bgmc_lut, &ctx->bgmc_lut_status);
2024
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 4 if (ret < 0)
2025 ✗ return ret;
2026 }
2027
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 14 if (sconf->floating) {
2028 ✗ avctx->sample_fmt = AV_SAMPLE_FMT_FLT;
2029 ✗ avctx->bits_per_raw_sample = 32;
2030 } else {
2031 28 avctx->sample_fmt = sconf->resolution > 1
2032
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 14 ? AV_SAMPLE_FMT_S32 : AV_SAMPLE_FMT_S16;
2033 14 avctx->bits_per_raw_sample = (sconf->resolution + 1) * 8;
2034
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 14 if (avctx->bits_per_raw_sample > 32) {
2035 ✗ av_log(avctx, AV_LOG_ERROR, "Bits per raw sample %d larger than 32.\n",
2036 avctx->bits_per_raw_sample);
2037 ✗ return AVERROR_INVALIDDATA;
2038 }
2039 }
2040
2041 // set maximum Rice parameter for progressive decoding based on resolution
2042 // This is not specified in 14496-3 but actually done by the reference
2043 // codec RM22 revision 2.
2044
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 14 ctx->s_max = sconf->resolution > 1 ? 31 : 15;
2045
2046 // set lag value for long-term prediction
2047
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 14 ctx->ltp_lag_length = 8 + (avctx->sample_rate >= 96000) +
2048 14 (avctx->sample_rate >= 192000);
2049
2050 // allocate quantized parcor coefficient buffer
2051
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 14 num_buffers = sconf->mc_coding ? channels : 1;
2052
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 14 if (num_buffers * (uint64_t)num_buffers > INT_MAX) // protect chan_data_buffer allocation
2053 ✗ return AVERROR_INVALIDDATA;
2054
2055 14 ctx->quant_cof = av_malloc_array(num_buffers, sizeof(*ctx->quant_cof));
2056 14 ctx->lpc_cof = av_malloc_array(num_buffers, sizeof(*ctx->lpc_cof));
2057 14 ctx->quant_cof_buffer = av_malloc_array(num_buffers * sconf->max_order,
2058 sizeof(*ctx->quant_cof_buffer));
2059 14 ctx->lpc_cof_buffer = av_malloc_array(num_buffers * sconf->max_order,
2060 sizeof(*ctx->lpc_cof_buffer));
2061 14 ctx->lpc_cof_reversed_buffer = av_malloc_array(sconf->max_order,
2062 sizeof(*ctx->lpc_cof_buffer));
2063
2064
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 14 if (!ctx->quant_cof || !ctx->lpc_cof ||
2065
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 14 !ctx->quant_cof_buffer || !ctx->lpc_cof_buffer ||
2066
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 14 !ctx->lpc_cof_reversed_buffer) {
2067 ✗ av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
2068 ✗ return AVERROR(ENOMEM);
2069 }
2070
2071 // assign quantized parcor coefficient buffers
2072
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 1052 for (c = 0; c < num_buffers; c++) {
2073 1038 ctx->quant_cof[c] = ctx->quant_cof_buffer + c * sconf->max_order;
2074 1038 ctx->lpc_cof[c] = ctx->lpc_cof_buffer + c * sconf->max_order;
2075 }
2076
2077 // allocate and assign lag and gain data buffer for ltp mode
2078 14 ctx->const_block = av_malloc_array(num_buffers, sizeof(*ctx->const_block));
2079 14 ctx->shift_lsbs = av_malloc_array(num_buffers, sizeof(*ctx->shift_lsbs));
2080 14 ctx->opt_order = av_malloc_array(num_buffers, sizeof(*ctx->opt_order));
2081 14 ctx->store_prev_samples = av_malloc_array(num_buffers, sizeof(*ctx->store_prev_samples));
2082 14 ctx->use_ltp = av_calloc(num_buffers, sizeof(*ctx->use_ltp));
2083 14 ctx->ltp_lag = av_malloc_array(num_buffers, sizeof(*ctx->ltp_lag));
2084 14 ctx->ltp_gain = av_malloc_array(num_buffers, sizeof(*ctx->ltp_gain));
2085 14 ctx->ltp_gain_buffer = av_malloc_array(num_buffers * 5, sizeof(*ctx->ltp_gain_buffer));
2086
2087
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 14 if (!ctx->const_block || !ctx->shift_lsbs ||
2088
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 14 !ctx->opt_order || !ctx->store_prev_samples ||
2089
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 14 !ctx->use_ltp || !ctx->ltp_lag ||
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 14 !ctx->ltp_gain || !ctx->ltp_gain_buffer) {
2091 ✗ av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
2092 ✗ return AVERROR(ENOMEM);
2093 }
2094
2095
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 1052 for (c = 0; c < num_buffers; c++)
2096 1038 ctx->ltp_gain[c] = ctx->ltp_gain_buffer + c * 5;
2097
2098 // allocate and assign channel data buffer for mcc mode
2099
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 14 if (sconf->mc_coding) {
2100 4 ctx->chan_data_buffer = av_calloc(num_buffers * num_buffers,
2101 sizeof(*ctx->chan_data_buffer));
2102 4 ctx->chan_data = av_calloc(num_buffers, sizeof(*ctx->chan_data));
2103 4 ctx->reverted_channels = av_malloc_array(num_buffers,
2104 sizeof(*ctx->reverted_channels));
2105
2106
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 4 if (!ctx->chan_data_buffer || !ctx->chan_data || !ctx->reverted_channels) {
2107 ✗ av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
2108 ✗ return AVERROR(ENOMEM);
2109 }
2110
2111
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 1032 for (c = 0; c < num_buffers; c++)
2112 1028 ctx->chan_data[c] = ctx->chan_data_buffer + c * num_buffers;
2113 } else {
2114 10 ctx->chan_data = NULL;
2115 10 ctx->chan_data_buffer = NULL;
2116 10 ctx->reverted_channels = NULL;
2117 }
2118
2119
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 14 if (sconf->floating) {
2120 ✗ ctx->acf = av_malloc_array(channels, sizeof(*ctx->acf));
2121 ✗ ctx->shift_value = av_calloc(channels, sizeof(*ctx->shift_value));
2122 ✗ ctx->last_shift_value = av_calloc(channels, sizeof(*ctx->last_shift_value));
2123 ✗ ctx->last_acf_mantissa = av_calloc(channels, sizeof(*ctx->last_acf_mantissa));
2124 ✗ ctx->raw_mantissa = av_calloc(channels, sizeof(*ctx->raw_mantissa));
2125
2126 ✗ ctx->larray = av_malloc_array(ctx->cur_frame_length * 4, sizeof(*ctx->larray));
2127 ✗ ctx->nbits = av_malloc_array(ctx->cur_frame_length, sizeof(*ctx->nbits));
2128 ✗ ctx->mlz = av_mallocz(sizeof(*ctx->mlz));
2129
2130 ✗ if (!ctx->larray || !ctx->nbits || !ctx->mlz || !ctx->acf || !ctx->shift_value
2131 ✗ || !ctx->last_shift_value || !ctx->last_acf_mantissa || !ctx->raw_mantissa) {
2132 ✗ av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
2133 ✗ return AVERROR(ENOMEM);
2134 }
2135
2136 ✗ ret = ff_mlz_init_dict(avctx, ctx->mlz);
2137 ✗ if (ret < 0)
2138 ✗ return ret;
2139 ✗ ff_mlz_flush_dict(ctx->mlz);
2140
2141 ✗ for (c = 0; c < channels; ++c) {
2142 ✗ ctx->raw_mantissa[c] = av_calloc(ctx->cur_frame_length, sizeof(**ctx->raw_mantissa));
2143 ✗ if (!ctx->raw_mantissa[c]) {
2144 ✗ av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
2145 ✗ return AVERROR(ENOMEM);
2146 }
2147 }
2148 }
2149
2150 14 channel_size = sconf->frame_length + sconf->max_order;
2151
2152 // allocate previous raw sample buffer
2153 14 ctx->prev_raw_samples = av_malloc_array(sconf->max_order, sizeof(*ctx->prev_raw_samples));
2154 14 ctx->raw_buffer = av_calloc(channels * channel_size, sizeof(*ctx->raw_buffer));
2155 14 ctx->raw_samples = av_malloc_array(channels, sizeof(*ctx->raw_samples));
2156
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 14 if (!ctx->prev_raw_samples || !ctx->raw_buffer|| !ctx->raw_samples) {
2157 ✗ av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
2158 ✗ return AVERROR(ENOMEM);
2159 }
2160
2161 // assign raw samples buffers
2162 14 ctx->raw_samples[0] = ctx->raw_buffer + sconf->max_order;
2163
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 1048 for (c = 1; c < channels; c++)
2164 1034 ctx->raw_samples[c] = ctx->raw_samples[c - 1] + channel_size;
2165
2166 // allocate crc buffer
2167
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 14 if (HAVE_BIGENDIAN != sconf->msb_first && sconf->crc_enabled &&
2168 ✗ (avctx->err_recognition & (AV_EF_CRCCHECK|AV_EF_CAREFUL))) {
2169 ✗ ctx->crc_buffer = av_malloc_array(ctx->cur_frame_length *
2170 ✗ channels *
2171 ✗ av_get_bytes_per_sample(avctx->sample_fmt),
2172 sizeof(*ctx->crc_buffer));
2173 ✗ if (!ctx->crc_buffer) {
2174 ✗ av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
2175 ✗ return AVERROR(ENOMEM);
2176 }
2177 }
2178
2179 14 ff_bswapdsp_init(&ctx->bdsp);
2180
2181 14 return 0;
2182 }
2183
2184
2185 /** Flush (reset) the frame ID after seeking.
2186 */
2187 ✗ static av_cold void flush(AVCodecContext *avctx)
2188 {
2189 ✗ ALSDecContext *ctx = avctx->priv_data;
2190
2191 ✗ ctx->frame_id = 0;
2192 ✗ }
2193
2194 static const AVOption options[] = {
2195 { "max_order", "Sets the maximum order (ALS simple profile allows max 15)", offsetof(ALSDecContext, user_max_order), AV_OPT_TYPE_INT, { .i64 = 1023 }, 0, 1023, AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_DECODING_PARAM },
2196 { NULL }
2197 };
2198
2199 static const AVClass als_class = {
2200 .class_name = "als",
2201 .item_name = av_default_item_name,
2202 .option = options,
2203 .version = LIBAVUTIL_VERSION_INT,
2204 };
2205
2206 const FFCodec ff_als_decoder = {
2207 .p.name = "als",
2208 CODEC_LONG_NAME("MPEG-4 Audio Lossless Coding (ALS)"),
2209 .p.type = AVMEDIA_TYPE_AUDIO,
2210 .p.id = AV_CODEC_ID_MP4ALS,
2211 .priv_data_size = sizeof(ALSDecContext),
2212 .init = decode_init,
2213 .close = decode_end,
2214 FF_CODEC_DECODE_CB(decode_frame),
2215 .p.priv_class = &als_class,
2216 .flush = flush,
2217 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_CHANNEL_CONF,
2218 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
2219 };
2220