FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/alsdec.c
Date: 2025-06-30 14:39:11
Exec Total Coverage
Lines: 676 1037 65.2%
Functions: 21 27 77.8%
Branches: 333 646 51.5%
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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/samplefmt.h"
42 #include "libavutil/crc.h"
43 #include "libavutil/softfloat_ieee754.h"
44 #include "libavutil/intreadwrite.h"
45
46 #include <stdint.h>
47
48 /** Rice parameters and corresponding index offsets for decoding the
49 * indices of scaled PARCOR values. The table chosen is set globally
50 * by the encoder and stored in ALSSpecificConfig.
51 */
52 static const int8_t parcor_rice_table[3][20][2] = {
53 { {-52, 4}, {-29, 5}, {-31, 4}, { 19, 4}, {-16, 4},
54 { 12, 3}, { -7, 3}, { 9, 3}, { -5, 3}, { 6, 3},
55 { -4, 3}, { 3, 3}, { -3, 2}, { 3, 2}, { -2, 2},
56 { 3, 2}, { -1, 2}, { 2, 2}, { -1, 2}, { 2, 2} },
57 { {-58, 3}, {-42, 4}, {-46, 4}, { 37, 5}, {-36, 4},
58 { 29, 4}, {-29, 4}, { 25, 4}, {-23, 4}, { 20, 4},
59 {-17, 4}, { 16, 4}, {-12, 4}, { 12, 3}, {-10, 4},
60 { 7, 3}, { -4, 4}, { 3, 3}, { -1, 3}, { 1, 3} },
61 { {-59, 3}, {-45, 5}, {-50, 4}, { 38, 4}, {-39, 4},
62 { 32, 4}, {-30, 4}, { 25, 3}, {-23, 3}, { 20, 3},
63 {-20, 3}, { 16, 3}, {-13, 3}, { 10, 3}, { -7, 3},
64 { 3, 3}, { 0, 3}, { -1, 3}, { 2, 3}, { -1, 2} }
65 };
66
67
68 /** Scaled PARCOR values used for the first two PARCOR coefficients.
69 * To be indexed by the Rice coded indices.
70 * Generated by: parcor_scaled_values[i] = 32 + ((i * (i+1)) << 7) - (1 << 20)
71 * Actual values are divided by 32 in order to be stored in 16 bits.
72 */
73 static const int16_t parcor_scaled_values[] = {
74 -1048544 / 32, -1048288 / 32, -1047776 / 32, -1047008 / 32,
75 -1045984 / 32, -1044704 / 32, -1043168 / 32, -1041376 / 32,
76 -1039328 / 32, -1037024 / 32, -1034464 / 32, -1031648 / 32,
77 -1028576 / 32, -1025248 / 32, -1021664 / 32, -1017824 / 32,
78 -1013728 / 32, -1009376 / 32, -1004768 / 32, -999904 / 32,
79 -994784 / 32, -989408 / 32, -983776 / 32, -977888 / 32,
80 -971744 / 32, -965344 / 32, -958688 / 32, -951776 / 32,
81 -944608 / 32, -937184 / 32, -929504 / 32, -921568 / 32,
82 -913376 / 32, -904928 / 32, -896224 / 32, -887264 / 32,
83 -878048 / 32, -868576 / 32, -858848 / 32, -848864 / 32,
84 -838624 / 32, -828128 / 32, -817376 / 32, -806368 / 32,
85 -795104 / 32, -783584 / 32, -771808 / 32, -759776 / 32,
86 -747488 / 32, -734944 / 32, -722144 / 32, -709088 / 32,
87 -695776 / 32, -682208 / 32, -668384 / 32, -654304 / 32,
88 -639968 / 32, -625376 / 32, -610528 / 32, -595424 / 32,
89 -580064 / 32, -564448 / 32, -548576 / 32, -532448 / 32,
90 -516064 / 32, -499424 / 32, -482528 / 32, -465376 / 32,
91 -447968 / 32, -430304 / 32, -412384 / 32, -394208 / 32,
92 -375776 / 32, -357088 / 32, -338144 / 32, -318944 / 32,
93 -299488 / 32, -279776 / 32, -259808 / 32, -239584 / 32,
94 -219104 / 32, -198368 / 32, -177376 / 32, -156128 / 32,
95 -134624 / 32, -112864 / 32, -90848 / 32, -68576 / 32,
96 -46048 / 32, -23264 / 32, -224 / 32, 23072 / 32,
97 46624 / 32, 70432 / 32, 94496 / 32, 118816 / 32,
98 143392 / 32, 168224 / 32, 193312 / 32, 218656 / 32,
99 244256 / 32, 270112 / 32, 296224 / 32, 322592 / 32,
100 349216 / 32, 376096 / 32, 403232 / 32, 430624 / 32,
101 458272 / 32, 486176 / 32, 514336 / 32, 542752 / 32,
102 571424 / 32, 600352 / 32, 629536 / 32, 658976 / 32,
103 688672 / 32, 718624 / 32, 748832 / 32, 779296 / 32,
104 810016 / 32, 840992 / 32, 872224 / 32, 903712 / 32,
105 935456 / 32, 967456 / 32, 999712 / 32, 1032224 / 32
106 };
107
108
109 /** Gain values of p(0) for long-term prediction.
110 * To be indexed by the Rice coded indices.
111 */
112 static const uint8_t ltp_gain_values [4][4] = {
113 { 0, 8, 16, 24},
114 {32, 40, 48, 56},
115 {64, 70, 76, 82},
116 {88, 92, 96, 100}
117 };
118
119
120 /** Inter-channel weighting factors for multi-channel correlation.
121 * To be indexed by the Rice coded indices.
122 */
123 static const int16_t mcc_weightings[] = {
124 204, 192, 179, 166, 153, 140, 128, 115,
125 102, 89, 76, 64, 51, 38, 25, 12,
126 0, -12, -25, -38, -51, -64, -76, -89,
127 -102, -115, -128, -140, -153, -166, -179, -192
128 };
129
130
131 /** Tail codes used in arithmetic coding using block Gilbert-Moore codes.
132 */
133 static const uint8_t tail_code[16][6] = {
134 { 74, 44, 25, 13, 7, 3},
135 { 68, 42, 24, 13, 7, 3},
136 { 58, 39, 23, 13, 7, 3},
137 {126, 70, 37, 19, 10, 5},
138 {132, 70, 37, 20, 10, 5},
139 {124, 70, 38, 20, 10, 5},
140 {120, 69, 37, 20, 11, 5},
141 {116, 67, 37, 20, 11, 5},
142 {108, 66, 36, 20, 10, 5},
143 {102, 62, 36, 20, 10, 5},
144 { 88, 58, 34, 19, 10, 5},
145 {162, 89, 49, 25, 13, 7},
146 {156, 87, 49, 26, 14, 7},
147 {150, 86, 47, 26, 14, 7},
148 {142, 84, 47, 26, 14, 7},
149 {131, 79, 46, 26, 14, 7}
150 };
151
152
153 enum RA_Flag {
154 RA_FLAG_NONE,
155 RA_FLAG_FRAMES,
156 RA_FLAG_HEADER
157 };
158
159
160 typedef struct ALSSpecificConfig {
161 uint32_t samples; ///< number of samples, 0xFFFFFFFF if unknown
162 int resolution; ///< 000 = 8-bit; 001 = 16-bit; 010 = 24-bit; 011 = 32-bit
163 int floating; ///< 1 = IEEE 32-bit floating-point, 0 = integer
164 int msb_first; ///< 1 = original CRC calculated on big-endian system, 0 = little-endian
165 int frame_length; ///< frame length for each frame (last frame may differ)
166 int ra_distance; ///< distance between RA frames (in frames, 0...255)
167 enum RA_Flag ra_flag; ///< indicates where the size of ra units is stored
168 int adapt_order; ///< adaptive order: 1 = on, 0 = off
169 int coef_table; ///< table index of Rice code parameters
170 int long_term_prediction; ///< long term prediction (LTP): 1 = on, 0 = off
171 int max_order; ///< maximum prediction order (0..1023)
172 int block_switching; ///< number of block switching levels
173 int bgmc; ///< "Block Gilbert-Moore Code": 1 = on, 0 = off (Rice coding only)
174 int sb_part; ///< sub-block partition
175 int joint_stereo; ///< joint stereo: 1 = on, 0 = off
176 int mc_coding; ///< extended inter-channel coding (multi channel coding): 1 = on, 0 = off
177 int chan_config; ///< indicates that a chan_config_info field is present
178 int chan_sort; ///< channel rearrangement: 1 = on, 0 = off
179 int rlslms; ///< use "Recursive Least Square-Least Mean Square" predictor: 1 = on, 0 = off
180 int chan_config_info; ///< mapping of channels to loudspeaker locations. Unused until setting channel configuration is implemented.
181 int *chan_pos; ///< original channel positions
182 int crc_enabled; ///< enable Cyclic Redundancy Checksum
183 } ALSSpecificConfig;
184
185
186 typedef struct ALSChannelData {
187 int stop_flag;
188 int master_channel;
189 int time_diff_flag;
190 int time_diff_sign;
191 int time_diff_index;
192 int weighting[6];
193 } ALSChannelData;
194
195
196 typedef struct ALSDecContext {
197 AVCodecContext *avctx;
198 ALSSpecificConfig sconf;
199 GetBitContext gb;
200 BswapDSPContext bdsp;
201 const AVCRC *crc_table;
202 uint32_t crc_org; ///< CRC value of the original input data
203 uint32_t crc; ///< CRC value calculated from decoded data
204 unsigned int cur_frame_length; ///< length of the current frame to decode
205 unsigned int frame_id; ///< the frame ID / number of the current frame
206 unsigned int js_switch; ///< if true, joint-stereo decoding is enforced
207 unsigned int cs_switch; ///< if true, channel rearrangement is done
208 unsigned int num_blocks; ///< number of blocks used in the current frame
209 unsigned int s_max; ///< maximum Rice parameter allowed in entropy coding
210 uint8_t *bgmc_lut; ///< pointer at lookup tables used for BGMC
211 int *bgmc_lut_status; ///< pointer at lookup table status flags used for BGMC
212 int ltp_lag_length; ///< number of bits used for ltp lag value
213 int *const_block; ///< contains const_block flags for all channels
214 unsigned int *shift_lsbs; ///< contains shift_lsbs flags for all channels
215 unsigned int *opt_order; ///< contains opt_order flags for all channels
216 int *store_prev_samples; ///< contains store_prev_samples flags for all channels
217 int *use_ltp; ///< contains use_ltp flags for all channels
218 int *ltp_lag; ///< contains ltp lag values for all channels
219 int **ltp_gain; ///< gain values for ltp 5-tap filter for a channel
220 int *ltp_gain_buffer; ///< contains all gain values for ltp 5-tap filter
221 int32_t **quant_cof; ///< quantized parcor coefficients for a channel
222 int32_t *quant_cof_buffer; ///< contains all quantized parcor coefficients
223 int32_t **lpc_cof; ///< coefficients of the direct form prediction filter for a channel
224 int32_t *lpc_cof_buffer; ///< contains all coefficients of the direct form prediction filter
225 int32_t *lpc_cof_reversed_buffer; ///< temporary buffer to set up a reversed versio of lpc_cof_buffer
226 ALSChannelData **chan_data; ///< channel data for multi-channel correlation
227 ALSChannelData *chan_data_buffer; ///< contains channel data for all channels
228 int *reverted_channels; ///< stores a flag for each reverted channel
229 int32_t *prev_raw_samples; ///< contains unshifted raw samples from the previous block
230 int32_t **raw_samples; ///< decoded raw samples for each channel
231 int32_t *raw_buffer; ///< contains all decoded raw samples including carryover samples
232 uint8_t *crc_buffer; ///< buffer of byte order corrected samples used for CRC check
233 MLZ* mlz; ///< masked lz decompression structure
234 SoftFloat_IEEE754 *acf; ///< contains common multiplier for all channels
235 int *last_acf_mantissa; ///< contains the last acf mantissa data of common multiplier for all channels
236 int *shift_value; ///< value by which the binary point is to be shifted for all channels
237 int *last_shift_value; ///< contains last shift value for all channels
238 int **raw_mantissa; ///< decoded mantissa bits of the difference signal
239 unsigned char *larray; ///< buffer to store the output of masked lz decompression
240 int *nbits; ///< contains the number of bits to read for masked lz decompression for all samples
241 int highest_decoded_channel;
242 } ALSDecContext;
243
244
245 typedef struct ALSBlockData {
246 unsigned int block_length; ///< number of samples within the block
247 unsigned int ra_block; ///< if true, this is a random access block
248 int *const_block; ///< if true, this is a constant value block
249 int js_blocks; ///< true if this block contains a difference signal
250 unsigned int *shift_lsbs; ///< shift of values for this block
251 unsigned int *opt_order; ///< prediction order of this block
252 int *store_prev_samples;///< if true, carryover samples have to be stored
253 int *use_ltp; ///< if true, long-term prediction is used
254 int *ltp_lag; ///< lag value for long-term prediction
255 int *ltp_gain; ///< gain values for ltp 5-tap filter
256 int32_t *quant_cof; ///< quantized parcor coefficients
257 int32_t *lpc_cof; ///< coefficients of the direct form prediction
258 int32_t *raw_samples; ///< decoded raw samples / residuals for this block
259 int32_t *prev_raw_samples; ///< contains unshifted raw samples from the previous block
260 int32_t *raw_other; ///< decoded raw samples of the other channel of a channel pair
261 } ALSBlockData;
262
263
264 14 static av_cold void dprint_specific_config(ALSDecContext *ctx)
265 {
266 #ifdef DEBUG
267 AVCodecContext *avctx = ctx->avctx;
268 ALSSpecificConfig *sconf = &ctx->sconf;
269
270 ff_dlog(avctx, "resolution = %i\n", sconf->resolution);
271 ff_dlog(avctx, "floating = %i\n", sconf->floating);
272 ff_dlog(avctx, "frame_length = %i\n", sconf->frame_length);
273 ff_dlog(avctx, "ra_distance = %i\n", sconf->ra_distance);
274 ff_dlog(avctx, "ra_flag = %i\n", sconf->ra_flag);
275 ff_dlog(avctx, "adapt_order = %i\n", sconf->adapt_order);
276 ff_dlog(avctx, "coef_table = %i\n", sconf->coef_table);
277 ff_dlog(avctx, "long_term_prediction = %i\n", sconf->long_term_prediction);
278 ff_dlog(avctx, "max_order = %i\n", sconf->max_order);
279 ff_dlog(avctx, "block_switching = %i\n", sconf->block_switching);
280 ff_dlog(avctx, "bgmc = %i\n", sconf->bgmc);
281 ff_dlog(avctx, "sb_part = %i\n", sconf->sb_part);
282 ff_dlog(avctx, "joint_stereo = %i\n", sconf->joint_stereo);
283 ff_dlog(avctx, "mc_coding = %i\n", sconf->mc_coding);
284 ff_dlog(avctx, "chan_config = %i\n", sconf->chan_config);
285 ff_dlog(avctx, "chan_sort = %i\n", sconf->chan_sort);
286 ff_dlog(avctx, "RLSLMS = %i\n", sconf->rlslms);
287 ff_dlog(avctx, "chan_config_info = %i\n", sconf->chan_config_info);
288 #endif
289 14 }
290
291
292 /** Read an ALSSpecificConfig from a buffer into the output struct.
293 */
294 14 static av_cold int read_specific_config(ALSDecContext *ctx)
295 {
296 GetBitContext gb;
297 uint64_t ht_size;
298 int i, config_offset;
299 14 MPEG4AudioConfig m4ac = {0};
300 14 ALSSpecificConfig *sconf = &ctx->sconf;
301 14 AVCodecContext *avctx = ctx->avctx;
302 uint32_t als_id, header_size, trailer_size;
303 int ret;
304
305
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 14 if ((ret = init_get_bits8(&gb, avctx->extradata, avctx->extradata_size)) < 0)
306 ✗ return ret;
307
308 14 config_offset = avpriv_mpeg4audio_get_config2(&m4ac, avctx->extradata,
309 avctx->extradata_size, 1, avctx);
310
311
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 14 if (config_offset < 0)
312 ✗ return AVERROR_INVALIDDATA;
313
314 14 skip_bits_long(&gb, config_offset);
315
316
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 14 if (get_bits_left(&gb) < (30 << 3))
317 ✗ return AVERROR_INVALIDDATA;
318
319 // read the fixed items
320 14 als_id = get_bits_long(&gb, 32);
321 14 avctx->sample_rate = m4ac.sample_rate;
322 14 skip_bits_long(&gb, 32); // sample rate already known
323 14 sconf->samples = get_bits_long(&gb, 32);
324
325
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 14 if (avctx->ch_layout.nb_channels != m4ac.channels) {
326 ✗ av_channel_layout_uninit(&avctx->ch_layout);
327 ✗ avctx->ch_layout.order = AV_CHANNEL_ORDER_UNSPEC;
328 ✗ avctx->ch_layout.nb_channels = m4ac.channels;
329 }
330
331 14 skip_bits(&gb, 16); // number of channels already known
332 14 skip_bits(&gb, 3); // skip file_type
333 14 sconf->resolution = get_bits(&gb, 3);
334 14 sconf->floating = get_bits1(&gb);
335 14 sconf->msb_first = get_bits1(&gb);
336 14 sconf->frame_length = get_bits(&gb, 16) + 1;
337 14 sconf->ra_distance = get_bits(&gb, 8);
338 14 sconf->ra_flag = get_bits(&gb, 2);
339 14 sconf->adapt_order = get_bits1(&gb);
340 14 sconf->coef_table = get_bits(&gb, 2);
341 14 sconf->long_term_prediction = get_bits1(&gb);
342 14 sconf->max_order = get_bits(&gb, 10);
343 14 sconf->block_switching = get_bits(&gb, 2);
344 14 sconf->bgmc = get_bits1(&gb);
345 14 sconf->sb_part = get_bits1(&gb);
346 14 sconf->joint_stereo = get_bits1(&gb);
347 14 sconf->mc_coding = get_bits1(&gb);
348 14 sconf->chan_config = get_bits1(&gb);
349 14 sconf->chan_sort = get_bits1(&gb);
350 14 sconf->crc_enabled = get_bits1(&gb);
351 14 sconf->rlslms = get_bits1(&gb);
352 14 skip_bits(&gb, 5); // skip 5 reserved bits
353 14 skip_bits1(&gb); // skip aux_data_enabled
354
355
356 // check for ALSSpecificConfig struct
357
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 14 if (als_id != MKBETAG('A','L','S','\0'))
358 ✗ return AVERROR_INVALIDDATA;
359
360
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 14 if (avctx->ch_layout.nb_channels > FF_SANE_NB_CHANNELS) {
361 ✗ avpriv_request_sample(avctx, "Huge number of channels");
362 ✗ return AVERROR_PATCHWELCOME;
363 }
364
365
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 14 if (avctx->ch_layout.nb_channels == 0)
366 ✗ return AVERROR_INVALIDDATA;
367
368 14 ctx->cur_frame_length = sconf->frame_length;
369
370 // read channel config
371
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 14 if (sconf->chan_config)
372 ✗ sconf->chan_config_info = get_bits(&gb, 16);
373 // TODO: use this to set avctx->channel_layout
374
375
376 // read channel sorting
377
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 14 if (sconf->chan_sort && avctx->ch_layout.nb_channels > 1) {
378 ✗ int chan_pos_bits = av_ceil_log2(avctx->ch_layout.nb_channels);
379 ✗ int bits_needed = avctx->ch_layout.nb_channels * chan_pos_bits + 7;
380 ✗ if (get_bits_left(&gb) < bits_needed)
381 ✗ return AVERROR_INVALIDDATA;
382
383 ✗ if (!(sconf->chan_pos = av_malloc_array(avctx->ch_layout.nb_channels, sizeof(*sconf->chan_pos))))
384 ✗ return AVERROR(ENOMEM);
385
386 ✗ ctx->cs_switch = 1;
387
388 ✗ for (i = 0; i < avctx->ch_layout.nb_channels; i++) {
389 ✗ sconf->chan_pos[i] = -1;
390 }
391
392 ✗ for (i = 0; i < avctx->ch_layout.nb_channels; i++) {
393 int idx;
394
395 ✗ idx = get_bits(&gb, chan_pos_bits);
396 ✗ if (idx >= avctx->ch_layout.nb_channels || sconf->chan_pos[idx] != -1) {
397 ✗ av_log(avctx, AV_LOG_WARNING, "Invalid channel reordering.\n");
398 ✗ ctx->cs_switch = 0;
399 ✗ break;
400 }
401 ✗ sconf->chan_pos[idx] = i;
402 }
403
404 ✗ align_get_bits(&gb);
405 }
406
407
408 // read fixed header and trailer sizes,
409 // if size = 0xFFFFFFFF then there is no data field!
410
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 14 if (get_bits_left(&gb) < 64)
411 ✗ return AVERROR_INVALIDDATA;
412
413 14 header_size = get_bits_long(&gb, 32);
414 14 trailer_size = get_bits_long(&gb, 32);
415
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 14 if (header_size == 0xFFFFFFFF)
416 ✗ header_size = 0;
417
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 14 if (trailer_size == 0xFFFFFFFF)
418 ✗ trailer_size = 0;
419
420 14 ht_size = ((int64_t)(header_size) + (int64_t)(trailer_size)) << 3;
421
422
423 // skip the header and trailer data
424
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 14 if (get_bits_left(&gb) < ht_size)
425 ✗ return AVERROR_INVALIDDATA;
426
427
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 14 if (ht_size > INT32_MAX)
428 ✗ return AVERROR_PATCHWELCOME;
429
430 14 skip_bits_long(&gb, ht_size);
431
432
433 // initialize CRC calculation
434
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 14 if (sconf->crc_enabled) {
435
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 14 if (get_bits_left(&gb) < 32)
436 ✗ return AVERROR_INVALIDDATA;
437
438
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 14 if (avctx->err_recognition & (AV_EF_CRCCHECK|AV_EF_CAREFUL)) {
439 ✗ ctx->crc_table = av_crc_get_table(AV_CRC_32_IEEE_LE);
440 ✗ ctx->crc = 0xFFFFFFFF;
441 ✗ ctx->crc_org = ~get_bits_long(&gb, 32);
442 } else
443 14 skip_bits_long(&gb, 32);
444 }
445
446
447 // no need to read the rest of ALSSpecificConfig (ra_unit_size & aux data)
448
449 14 dprint_specific_config(ctx);
450
451 14 return 0;
452 }
453
454
455 /** Check the ALSSpecificConfig for unsupported features.
456 */
457 14 static int check_specific_config(ALSDecContext *ctx)
458 {
459 14 ALSSpecificConfig *sconf = &ctx->sconf;
460 14 int error = 0;
461
462 // report unsupported feature and set error value
463 #define MISSING_ERR(cond, str, errval) \
464 { \
465 if (cond) { \
466 avpriv_report_missing_feature(ctx->avctx, \
467 str); \
468 error = errval; \
469 } \
470 }
471
472
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 14 MISSING_ERR(sconf->rlslms, "Adaptive RLS-LMS prediction", AVERROR_PATCHWELCOME);
473
474 14 return error;
475 }
476
477
478 /** Parse the bs_info field to extract the block partitioning used in
479 * block switching mode, refer to ISO/IEC 14496-3, section 11.6.2.
480 */
481 3146 static void parse_bs_info(const uint32_t bs_info, unsigned int n,
482 unsigned int div, unsigned int **div_blocks,
483 unsigned int *num_blocks)
484 {
485
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 3146 if (n < 31 && ((bs_info << n) & 0x40000000)) {
486 // if the level is valid and the investigated bit n is set
487 // then recursively check both children at bits (2n+1) and (2n+2)
488 121 n *= 2;
489 121 div += 1;
490 121 parse_bs_info(bs_info, n + 1, div, div_blocks, num_blocks);
491 121 parse_bs_info(bs_info, n + 2, div, div_blocks, num_blocks);
492 } else {
493 // else the bit is not set or the last level has been reached
494 // (bit implicitly not set)
495 3025 **div_blocks = div;
496 3025 (*div_blocks)++;
497 3025 (*num_blocks)++;
498 }
499 3146 }
500
501
502 /** Read and decode a Rice codeword.
503 */
504 7307594 static int32_t decode_rice(GetBitContext *gb, unsigned int k)
505 {
506 7307594 int max = get_bits_left(gb) - k;
507 7307594 unsigned q = get_unary(gb, 0, max);
508
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 7307594 int r = k ? get_bits1(gb) : !(q & 1);
509
510
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 7307594 if (k > 1) {
511 7018473 q <<= (k - 1);
512 7018473 q += get_bits_long(gb, k - 1);
513
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 289121 } else if (!k) {
514 231387 q >>= 1;
515 }
516
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 7307594 return r ? q : ~q;
517 }
518
519
520 /** Convert PARCOR coefficient k to direct filter coefficient.
521 */
522 137495 static void parcor_to_lpc(unsigned int k, const int32_t *par, int32_t *cof)
523 {
524 int i, j;
525
526
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 2584335 for (i = 0, j = k - 1; i < j; i++, j--) {
527 2446840 unsigned tmp1 = ((MUL64(par[k], cof[j]) + (1 << 19)) >> 20);
528 2446840 cof[j] += ((MUL64(par[k], cof[i]) + (1 << 19)) >> 20);
529 2446840 cof[i] += tmp1;
530 }
531
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 137495 if (i == j)
532 68217 cof[i] += ((MUL64(par[k], cof[j]) + (1 << 19)) >> 20);
533
534 137495 cof[k] = par[k];
535 137495 }
536
537
538 /** Read block switching field if necessary and set actual block sizes.
539 * Also assure that the block sizes of the last frame correspond to the
540 * actual number of samples.
541 */
542 2904 static void get_block_sizes(ALSDecContext *ctx, unsigned int *div_blocks,
543 uint32_t *bs_info)
544 {
545 2904 ALSSpecificConfig *sconf = &ctx->sconf;
546 2904 GetBitContext *gb = &ctx->gb;
547 2904 unsigned int *ptr_div_blocks = div_blocks;
548 unsigned int b;
549
550
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 2904 if (sconf->block_switching) {
551 112 unsigned int bs_info_len = 1 << (sconf->block_switching + 2);
552 112 *bs_info = get_bits_long(gb, bs_info_len);
553 112 *bs_info <<= (32 - bs_info_len);
554 }
555
556 2904 ctx->num_blocks = 0;
557 2904 parse_bs_info(*bs_info, 0, 0, &ptr_div_blocks, &ctx->num_blocks);
558
559 // The last frame may have an overdetermined block structure given in
560 // the bitstream. In that case the defined block structure would need
561 // more samples than available to be consistent.
562 // The block structure is actually used but the block sizes are adapted
563 // to fit the actual number of available samples.
564 // Example: 5 samples, 2nd level block sizes: 2 2 2 2.
565 // This results in the actual block sizes: 2 2 1 0.
566 // This is not specified in 14496-3 but actually done by the reference
567 // codec RM22 revision 2.
568 // This appears to happen in case of an odd number of samples in the last
569 // frame which is actually not allowed by the block length switching part
570 // of 14496-3.
571 // The ALS conformance files feature an odd number of samples in the last
572 // frame.
573
574
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 5929 for (b = 0; b < ctx->num_blocks; b++)
575 3025 div_blocks[b] = ctx->sconf.frame_length >> div_blocks[b];
576
577
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 2904 if (ctx->cur_frame_length != ctx->sconf.frame_length) {
578 12 unsigned int remaining = ctx->cur_frame_length;
579
580
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 17 for (b = 0; b < ctx->num_blocks; b++) {
581
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 17 if (remaining <= div_blocks[b]) {
582 12 div_blocks[b] = remaining;
583 12 ctx->num_blocks = b + 1;
584 12 break;
585 }
586
587 5 remaining -= div_blocks[b];
588 }
589 }
590 2904 }
591
592
593 /** Read the block data for a constant block
594 */
595 ✗ static int read_const_block_data(ALSDecContext *ctx, ALSBlockData *bd)
596 {
597 ✗ ALSSpecificConfig *sconf = &ctx->sconf;
598 ✗ AVCodecContext *avctx = ctx->avctx;
599 ✗ GetBitContext *gb = &ctx->gb;
600
601 ✗ if (bd->block_length <= 0)
602 ✗ return AVERROR_INVALIDDATA;
603
604 ✗ *bd->raw_samples = 0;
605 ✗ *bd->const_block = get_bits1(gb); // 1 = constant value, 0 = zero block (silence)
606 ✗ bd->js_blocks = get_bits1(gb);
607
608 // skip 5 reserved bits
609 ✗ skip_bits(gb, 5);
610
611 ✗ if (*bd->const_block) {
612 ✗ unsigned int const_val_bits = sconf->floating ? 24 : avctx->bits_per_raw_sample;
613 ✗ *bd->raw_samples = get_sbits_long(gb, const_val_bits);
614 }
615
616 // ensure constant block decoding by reusing this field
617 ✗ *bd->const_block = 1;
618
619 ✗ return 0;
620 }
621
622
623 /** Decode the block data for a constant block
624 */
625 ✗ static void decode_const_block_data(ALSDecContext *ctx, ALSBlockData *bd)
626 {
627 ✗ int smp = bd->block_length - 1;
628 ✗ int32_t val = *bd->raw_samples;
629 ✗ int32_t *dst = bd->raw_samples + 1;
630
631 // write raw samples into buffer
632 ✗ for (; smp; smp--)
633 ✗ *dst++ = val;
634 ✗ }
635
636
637 /** Read the block data for a non-constant block
638 */
639 4767 static int read_var_block_data(ALSDecContext *ctx, ALSBlockData *bd)
640 {
641 4767 ALSSpecificConfig *sconf = &ctx->sconf;
642 4767 AVCodecContext *avctx = ctx->avctx;
643 4767 GetBitContext *gb = &ctx->gb;
644 unsigned int k;
645 unsigned int s[8];
646 unsigned int sx[8];
647 unsigned int sub_blocks, log2_sub_blocks, sb_length;
648 4767 unsigned int start = 0;
649 unsigned int opt_order;
650 int sb;
651 4767 int32_t *quant_cof = bd->quant_cof;
652 int32_t *current_res;
653
654
655 // ensure variable block decoding by reusing this field
656 4767 *bd->const_block = 0;
657
658 4767 *bd->opt_order = 1;
659 4767 bd->js_blocks = get_bits1(gb);
660
661 4767 opt_order = *bd->opt_order;
662
663 // determine the number of subblocks for entropy decoding
664
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 4767 if (!sconf->bgmc && !sconf->sb_part) {
665 ✗ log2_sub_blocks = 0;
666 } else {
667
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 4767 if (sconf->bgmc && sconf->sb_part)
668 1722 log2_sub_blocks = get_bits(gb, 2);
669 else
670 3045 log2_sub_blocks = 2 * get_bits1(gb);
671 }
672
673 4767 sub_blocks = 1 << log2_sub_blocks;
674
675 // do not continue in case of a damaged stream since
676 // block_length must be evenly divisible by sub_blocks
677
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 4767 if (bd->block_length & (sub_blocks - 1) || bd->block_length <= 0) {
678 ✗ av_log(avctx, AV_LOG_WARNING,
679 "Block length is not evenly divisible by the number of subblocks.\n");
680 ✗ return AVERROR_INVALIDDATA;
681 }
682
683 4767 sb_length = bd->block_length >> log2_sub_blocks;
684
685
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 4767 if (sconf->bgmc) {
686
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 1722 s[0] = get_bits(gb, 8 + (sconf->resolution > 1));
687
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 3148 for (k = 1; k < sub_blocks; k++)
688 1426 s[k] = s[k - 1] + decode_rice(gb, 2);
689
690
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 4870 for (k = 0; k < sub_blocks; k++) {
691 3148 sx[k] = s[k] & 0x0F;
692 3148 s [k] >>= 4;
693 }
694 } else {
695
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 3045 s[0] = get_bits(gb, 4 + (sconf->resolution > 1));
696
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 5325 for (k = 1; k < sub_blocks; k++)
697 2280 s[k] = s[k - 1] + decode_rice(gb, 0);
698 }
699
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 8473 for (k = 1; k < sub_blocks; k++)
700
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 3706 if (s[k] > 32) {
701 ✗ av_log(avctx, AV_LOG_ERROR, "k invalid for rice code.\n");
702 ✗ return AVERROR_INVALIDDATA;
703 }
704
705
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 4767 if (get_bits1(gb))
706 ✗ *bd->shift_lsbs = get_bits(gb, 4) + 1;
707
708
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 4767 *bd->store_prev_samples = (bd->js_blocks && bd->raw_other) || *bd->shift_lsbs;
709
710
711
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 4767 if (!sconf->rlslms) {
712
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 6742 if (sconf->adapt_order && sconf->max_order) {
713 1975 int opt_order_length = av_ceil_log2(av_clip((bd->block_length >> 3) - 1,
714 1975 2, sconf->max_order + 1));
715 1975 *bd->opt_order = get_bits(gb, opt_order_length);
716
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 1975 if (*bd->opt_order > sconf->max_order) {
717 ✗ *bd->opt_order = sconf->max_order;
718 ✗ av_log(avctx, AV_LOG_ERROR, "Predictor order too large.\n");
719 ✗ return AVERROR_INVALIDDATA;
720 }
721 } else {
722 2792 *bd->opt_order = sconf->max_order;
723 }
724 4767 opt_order = *bd->opt_order;
725
726
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 4767 if (opt_order) {
727 int add_base;
728
729
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 4767 if (sconf->coef_table == 3) {
730 ✗ add_base = 0x7F;
731
732 // read coefficient 0
733 ✗ quant_cof[0] = 32 * parcor_scaled_values[get_bits(gb, 7)];
734
735 // read coefficient 1
736 ✗ if (opt_order > 1)
737 ✗ quant_cof[1] = -32 * parcor_scaled_values[get_bits(gb, 7)];
738
739 // read coefficients 2 to opt_order
740 ✗ for (k = 2; k < opt_order; k++)
741 ✗ quant_cof[k] = get_bits(gb, 7);
742 } else {
743 int k_max;
744 4767 add_base = 1;
745
746 // read coefficient 0 to 19
747 4767 k_max = FFMIN(opt_order, 20);
748
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 70514 for (k = 0; k < k_max; k++) {
749 65747 int rice_param = parcor_rice_table[sconf->coef_table][k][1];
750 65747 int offset = parcor_rice_table[sconf->coef_table][k][0];
751 65747 quant_cof[k] = decode_rice(gb, rice_param) + offset;
752
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 65747 if (quant_cof[k] < -64 || quant_cof[k] > 63) {
753 ✗ av_log(avctx, AV_LOG_ERROR,
754 "quant_cof %"PRId32" is out of range.\n",
755 ✗ quant_cof[k]);
756 ✗ return AVERROR_INVALIDDATA;
757 }
758 }
759
760 // read coefficients 20 to 126
761 4767 k_max = FFMIN(opt_order, 127);
762
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 75239 for (; k < k_max; k++)
763 70472 quant_cof[k] = decode_rice(gb, 2) + (k & 1);
764
765 // read coefficients 127 to opt_order
766
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 6043 for (; k < opt_order; k++)
767 1276 quant_cof[k] = decode_rice(gb, 1);
768
769 4767 quant_cof[0] = 32 * parcor_scaled_values[quant_cof[0] + 64];
770
771
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 4767 if (opt_order > 1)
772 4767 quant_cof[1] = -32 * parcor_scaled_values[quant_cof[1] + 64];
773 }
774
775
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 132728 for (k = 2; k < opt_order; k++)
776 127961 quant_cof[k] = (quant_cof[k] * (1U << 14)) + (add_base << 13);
777 }
778 }
779
780 // read LTP gain and lag values
781
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 4767 if (sconf->long_term_prediction) {
782 1722 *bd->use_ltp = get_bits1(gb);
783
784
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 1722 if (*bd->use_ltp) {
785 int r, c;
786
787 1558 bd->ltp_gain[0] = decode_rice(gb, 1) * 8;
788 1558 bd->ltp_gain[1] = decode_rice(gb, 2) * 8;
789
790 1558 r = get_unary(gb, 0, 4);
791 1558 c = get_bits(gb, 2);
792
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 1558 if (r >= 4) {
793 ✗ av_log(avctx, AV_LOG_ERROR, "r overflow\n");
794 ✗ return AVERROR_INVALIDDATA;
795 }
796
797 1558 bd->ltp_gain[2] = ltp_gain_values[r][c];
798
799 1558 bd->ltp_gain[3] = decode_rice(gb, 2) * 8;
800 1558 bd->ltp_gain[4] = decode_rice(gb, 1) * 8;
801
802 1558 *bd->ltp_lag = get_bits(gb, ctx->ltp_lag_length);
803 1558 *bd->ltp_lag += FFMAX(4, opt_order + 1);
804 }
805 }
806
807 // read first value and residuals in case of a random access block
808
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 4767 if (bd->ra_block) {
809 698 start = FFMIN(opt_order, 3);
810
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 698 av_assert0(sb_length <= sconf->frame_length);
811
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 698 if (sb_length <= start) {
812 // opt_order or sb_length may be corrupted, either way this is unsupported and not well defined in the specification
813 ✗ av_log(avctx, AV_LOG_ERROR, "Sub block length smaller or equal start\n");
814 ✗ return AVERROR_PATCHWELCOME;
815 }
816
817
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 698 if (opt_order)
818 698 bd->raw_samples[0] = decode_rice(gb, avctx->bits_per_raw_sample - 4);
819
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 698 if (opt_order > 1)
820 698 bd->raw_samples[1] = decode_rice(gb, FFMIN(s[0] + 3, ctx->s_max));
821
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 698 if (opt_order > 2)
822 697 bd->raw_samples[2] = decode_rice(gb, FFMIN(s[0] + 1, ctx->s_max));
823 }
824
825 // read all residuals
826
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 4767 if (sconf->bgmc) {
827 int delta[8];
828 unsigned int k [8];
829 1722 unsigned int b = av_clip((av_ceil_log2(bd->block_length) - 3) >> 1, 0, 5);
830
831 // read most significant bits
832 unsigned int high;
833 unsigned int low;
834 unsigned int value;
835
836 1722 int ret = ff_bgmc_decode_init(gb, &high, &low, &value);
837
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 1722 if (ret < 0)
838 ✗ return ret;
839
840 1722 current_res = bd->raw_samples + start;
841
842
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 4870 for (sb = 0; sb < sub_blocks; sb++) {
843
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 3148 unsigned int sb_len = sb_length - (sb ? 0 : start);
844
845
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 3148 k [sb] = s[sb] > b ? s[sb] - b : 0;
846 3148 delta[sb] = 5 - s[sb] + k[sb];
847
848
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 3148 if (k[sb] >= 32)
849 ✗ return AVERROR_INVALIDDATA;
850
851 3148 ff_bgmc_decode(gb, sb_len, current_res,
852 delta[sb], sx[sb], &high, &low, &value, ctx->bgmc_lut, ctx->bgmc_lut_status);
853
854 3148 current_res += sb_len;
855 }
856
857 1722 ff_bgmc_decode_end(gb);
858
859
860 // read least significant bits and tails
861 1722 current_res = bd->raw_samples + start;
862
863
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 4870 for (sb = 0; sb < sub_blocks; sb++, start = 0) {
864 3148 unsigned int cur_tail_code = tail_code[sx[sb]][delta[sb]];
865 3148 unsigned int cur_k = k[sb];
866 3148 unsigned int cur_s = s[sb];
867
868
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 4584006 for (; start < sb_length; start++) {
869 4580858 int32_t res = *current_res;
870
871
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 4580858 if (res == cur_tail_code) {
872
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 12582 unsigned int max_msb = (2 + (sx[sb] > 2) + (sx[sb] > 10))
873 12582 << (5 - delta[sb]);
874
875 12582 res = decode_rice(gb, cur_s);
876
877
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 12582 if (res >= 0) {
878 6332 res += (max_msb ) << cur_k;
879 } else {
880 6250 res -= (max_msb - 1) << cur_k;
881 }
882 } else {
883
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 4568276 if (res > cur_tail_code)
884 94057 res--;
885
886
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 4568276 if (res & 1)
887 2023961 res = -res;
888
889 4568276 res >>= 1;
890
891
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 4568276 if (cur_k) {
892 866509 res *= 1U << cur_k;
893 866509 res |= get_bits_long(gb, cur_k);
894 }
895 }
896
897 4580858 *current_res++ = res;
898 }
899 }
900 } else {
901 3045 current_res = bd->raw_samples + start;
902
903
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 8370 for (sb = 0; sb < sub_blocks; sb++, start = 0)
904
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 7145090 for (; start < sb_length; start++)
905 7139765 *current_res++ = decode_rice(gb, s[sb]);
906 }
907
908 4767 return 0;
909 }
910
911
912 /** Decode the block data for a non-constant block
913 */
914 4767 static int decode_var_block_data(ALSDecContext *ctx, ALSBlockData *bd)
915 {
916 4767 ALSSpecificConfig *sconf = &ctx->sconf;
917 4767 unsigned int block_length = bd->block_length;
918 4767 unsigned int smp = 0;
919 unsigned int k;
920 4767 int opt_order = *bd->opt_order;
921 int sb;
922 int64_t y;
923 4767 int32_t *quant_cof = bd->quant_cof;
924 4767 int32_t *lpc_cof = bd->lpc_cof;
925 4767 int32_t *raw_samples = bd->raw_samples;
926 4767 int32_t *raw_samples_end = bd->raw_samples + bd->block_length;
927 4767 int32_t *lpc_cof_reversed = ctx->lpc_cof_reversed_buffer;
928
929 // reverse long-term prediction
930
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 4767 if (*bd->use_ltp) {
931 int ltp_smp;
932
933
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 3839287 for (ltp_smp = FFMAX(*bd->ltp_lag - 2, 0); ltp_smp < block_length; ltp_smp++) {
934 3837729 int center = ltp_smp - *bd->ltp_lag;
935 3837729 int begin = FFMAX(0, center - 2);
936 3837729 int end = center + 3;
937 3837729 int tab = 5 - (end - begin);
938 int base;
939
940 3837729 y = 1 << 6;
941
942
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 23010794 for (base = begin; base < end; base++, tab++)
943 19173065 y += (uint64_t)MUL64(bd->ltp_gain[tab], raw_samples[base]);
944
945 3837729 raw_samples[ltp_smp] += y >> 7;
946 }
947 }
948
949 // reconstruct all samples from residuals
950
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 4767 if (bd->ra_block) {
951
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 53993 for (smp = 0; smp < FFMIN(opt_order, block_length); smp++) {
952 53295 y = 1 << 19;
953
954
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 2692325 for (sb = 0; sb < smp; sb++)
955 2639030 y += (uint64_t)MUL64(lpc_cof[sb], raw_samples[-(sb + 1)]);
956
957 53295 *raw_samples++ -= y >> 20;
958 53295 parcor_to_lpc(smp, quant_cof, lpc_cof);
959 }
960 } else {
961
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 88269 for (k = 0; k < opt_order; k++)
962 84200 parcor_to_lpc(k, quant_cof, lpc_cof);
963
964 // store previous samples in case that they have to be altered
965
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 4069 if (*bd->store_prev_samples)
966 9 memcpy(bd->prev_raw_samples, raw_samples - sconf->max_order,
967 9 sizeof(*bd->prev_raw_samples) * sconf->max_order);
968
969 // reconstruct difference signal for prediction (joint-stereo)
970
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 4069 if (bd->js_blocks && bd->raw_other) {
971 uint32_t *left, *right;
972
973
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 9 if (bd->raw_other > raw_samples) { // D = R - L
974 4 left = raw_samples;
975 4 right = bd->raw_other;
976 } else { // D = R - L
977 5 left = bd->raw_other;
978 5 right = raw_samples;
979 }
980
981
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 333 for (sb = -1; sb >= -sconf->max_order; sb--)
982 324 raw_samples[sb] = right[sb] - left[sb];
983 }
984
985 // reconstruct shifted signal
986
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 4069 if (*bd->shift_lsbs)
987 ✗ for (sb = -1; sb >= -sconf->max_order; sb--)
988 ✗ raw_samples[sb] >>= *bd->shift_lsbs;
989 }
990
991 // reverse linear prediction coefficients for efficiency
992 4767 lpc_cof = lpc_cof + opt_order;
993
994
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 142262 for (sb = 0; sb < opt_order; sb++)
995 137495 lpc_cof_reversed[sb] = lpc_cof[-(sb + 1)];
996
997 // reconstruct raw samples
998 4767 raw_samples = bd->raw_samples + smp;
999 4767 lpc_cof = lpc_cof_reversed + opt_order;
1000
1001
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 11674188 for (; raw_samples < raw_samples_end; raw_samples++) {
1002 11669421 y = 1 << 19;
1003
1004
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 429242414 for (sb = -opt_order; sb < 0; sb++)
1005 417572993 y += (uint64_t)MUL64(lpc_cof[sb], raw_samples[sb]);
1006
1007 11669421 *raw_samples -= y >> 20;
1008 }
1009
1010 4767 raw_samples = bd->raw_samples;
1011
1012 // restore previous samples in case that they have been altered
1013
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 4767 if (*bd->store_prev_samples)
1014 9 memcpy(raw_samples - sconf->max_order, bd->prev_raw_samples,
1015 9 sizeof(*raw_samples) * sconf->max_order);
1016
1017 4767 return 0;
1018 }
1019
1020
1021 /** Read the block data.
1022 */
1023 4767 static int read_block(ALSDecContext *ctx, ALSBlockData *bd)
1024 {
1025 int ret;
1026 4767 GetBitContext *gb = &ctx->gb;
1027 4767 ALSSpecificConfig *sconf = &ctx->sconf;
1028
1029 4767 *bd->shift_lsbs = 0;
1030
1031
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 4767 if (get_bits_left(gb) < 7)
1032 ✗ return AVERROR_INVALIDDATA;
1033
1034 // read block type flag and read the samples accordingly
1035
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 4767 if (get_bits1(gb)) {
1036 4767 ret = read_var_block_data(ctx, bd);
1037 } else {
1038 ✗ ret = read_const_block_data(ctx, bd);
1039 }
1040
1041
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 4767 if (!sconf->mc_coding || ctx->js_switch)
1042 3045 align_get_bits(gb);
1043
1044 4767 return ret;
1045 }
1046
1047
1048 /** Decode the block data.
1049 */
1050 4767 static int decode_block(ALSDecContext *ctx, ALSBlockData *bd)
1051 {
1052 unsigned int smp;
1053 4767 int ret = 0;
1054
1055 // read block type flag and read the samples accordingly
1056
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 4767 if (*bd->const_block)
1057 ✗ decode_const_block_data(ctx, bd);
1058 else
1059 4767 ret = decode_var_block_data(ctx, bd); // always return 0
1060
1061
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 4767 if (ret < 0)
1062 ✗ return ret;
1063
1064 // TODO: read RLSLMS extension data
1065
1066
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 4767 if (*bd->shift_lsbs)
1067 ✗ for (smp = 0; smp < bd->block_length; smp++)
1068 ✗ bd->raw_samples[smp] = (unsigned)bd->raw_samples[smp] << *bd->shift_lsbs;
1069
1070 4767 return 0;
1071 }
1072
1073
1074 /** Read and decode block data successively.
1075 */
1076 3045 static int read_decode_block(ALSDecContext *ctx, ALSBlockData *bd)
1077 {
1078 int ret;
1079
1080
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 3045 if ((ret = read_block(ctx, bd)) < 0)
1081 ✗ return ret;
1082
1083 3045 return decode_block(ctx, bd);
1084 }
1085
1086
1087 /** Compute the number of samples left to decode for the current frame and
1088 * sets these samples to zero.
1089 */
1090 ✗ static void zero_remaining(unsigned int b, unsigned int b_max,
1091 const unsigned int *div_blocks, int32_t *buf)
1092 {
1093 ✗ unsigned int count = 0;
1094
1095 ✗ while (b < b_max)
1096 ✗ count += div_blocks[b++];
1097
1098 ✗ if (count)
1099 ✗ memset(buf, 0, sizeof(*buf) * count);
1100 ✗ }
1101
1102
1103 /** Decode blocks independently.
1104 */
1105 2138 static int decode_blocks_ind(ALSDecContext *ctx, unsigned int ra_frame,
1106 unsigned int c, const unsigned int *div_blocks,
1107 unsigned int *js_blocks)
1108 {
1109 int ret;
1110 unsigned int b;
1111 2138 ALSBlockData bd = { 0 };
1112
1113 2138 bd.ra_block = ra_frame;
1114 2138 bd.const_block = ctx->const_block;
1115 2138 bd.shift_lsbs = ctx->shift_lsbs;
1116 2138 bd.opt_order = ctx->opt_order;
1117 2138 bd.store_prev_samples = ctx->store_prev_samples;
1118 2138 bd.use_ltp = ctx->use_ltp;
1119 2138 bd.ltp_lag = ctx->ltp_lag;
1120 2138 bd.ltp_gain = ctx->ltp_gain[0];
1121 2138 bd.quant_cof = ctx->quant_cof[0];
1122 2138 bd.lpc_cof = ctx->lpc_cof[0];
1123 2138 bd.prev_raw_samples = ctx->prev_raw_samples;
1124 2138 bd.raw_samples = ctx->raw_samples[c];
1125
1126
1127
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 4317 for (b = 0; b < ctx->num_blocks; b++) {
1128 2179 bd.block_length = div_blocks[b];
1129
1130
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 2179 if ((ret = read_decode_block(ctx, &bd)) < 0) {
1131 // damaged block, write zero for the rest of the frame
1132 ✗ zero_remaining(b, ctx->num_blocks, div_blocks, bd.raw_samples);
1133 ✗ return ret;
1134 }
1135 2179 bd.raw_samples += div_blocks[b];
1136 2179 bd.ra_block = 0;
1137 }
1138
1139 2138 return 0;
1140 }
1141
1142
1143 /** Decode blocks dependently.
1144 */
1145 415 static int decode_blocks(ALSDecContext *ctx, unsigned int ra_frame,
1146 unsigned int c, const unsigned int *div_blocks,
1147 unsigned int *js_blocks)
1148 {
1149 415 ALSSpecificConfig *sconf = &ctx->sconf;
1150 415 unsigned int offset = 0;
1151 unsigned int b;
1152 int ret;
1153 415 ALSBlockData bd[2] = { { 0 } };
1154
1155 415 bd[0].ra_block = ra_frame;
1156 415 bd[0].const_block = ctx->const_block;
1157 415 bd[0].shift_lsbs = ctx->shift_lsbs;
1158 415 bd[0].opt_order = ctx->opt_order;
1159 415 bd[0].store_prev_samples = ctx->store_prev_samples;
1160 415 bd[0].use_ltp = ctx->use_ltp;
1161 415 bd[0].ltp_lag = ctx->ltp_lag;
1162 415 bd[0].ltp_gain = ctx->ltp_gain[0];
1163 415 bd[0].quant_cof = ctx->quant_cof[0];
1164 415 bd[0].lpc_cof = ctx->lpc_cof[0];
1165 415 bd[0].prev_raw_samples = ctx->prev_raw_samples;
1166 415 bd[0].js_blocks = *js_blocks;
1167
1168 415 bd[1].ra_block = ra_frame;
1169 415 bd[1].const_block = ctx->const_block;
1170 415 bd[1].shift_lsbs = ctx->shift_lsbs;
1171 415 bd[1].opt_order = ctx->opt_order;
1172 415 bd[1].store_prev_samples = ctx->store_prev_samples;
1173 415 bd[1].use_ltp = ctx->use_ltp;
1174 415 bd[1].ltp_lag = ctx->ltp_lag;
1175 415 bd[1].ltp_gain = ctx->ltp_gain[0];
1176 415 bd[1].quant_cof = ctx->quant_cof[0];
1177 415 bd[1].lpc_cof = ctx->lpc_cof[0];
1178 415 bd[1].prev_raw_samples = ctx->prev_raw_samples;
1179 415 bd[1].js_blocks = *(js_blocks + 1);
1180
1181 // decode all blocks
1182
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 848 for (b = 0; b < ctx->num_blocks; b++) {
1183 unsigned int s;
1184
1185 433 bd[0].block_length = div_blocks[b];
1186 433 bd[1].block_length = div_blocks[b];
1187
1188 433 bd[0].raw_samples = ctx->raw_samples[c ] + offset;
1189 433 bd[1].raw_samples = ctx->raw_samples[c + 1] + offset;
1190
1191 433 bd[0].raw_other = bd[1].raw_samples;
1192 433 bd[1].raw_other = bd[0].raw_samples;
1193
1194
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 866 if ((ret = read_decode_block(ctx, &bd[0])) < 0 ||
1195 433 (ret = read_decode_block(ctx, &bd[1])) < 0)
1196 ✗ goto fail;
1197
1198 // reconstruct joint-stereo blocks
1199
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 433 if (bd[0].js_blocks) {
1200
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 4 if (bd[1].js_blocks)
1201 ✗ av_log(ctx->avctx, AV_LOG_WARNING, "Invalid channel pair.\n");
1202
1203
2/2
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 16388 for (s = 0; s < div_blocks[b]; s++)
1204 16384 bd[0].raw_samples[s] = bd[1].raw_samples[s] - (unsigned)bd[0].raw_samples[s];
1205
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 429 } else if (bd[1].js_blocks) {
1206
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 10245 for (s = 0; s < div_blocks[b]; s++)
1207 10240 bd[1].raw_samples[s] = bd[1].raw_samples[s] + (unsigned)bd[0].raw_samples[s];
1208 }
1209
1210 433 offset += div_blocks[b];
1211 433 bd[0].ra_block = 0;
1212 433 bd[1].ra_block = 0;
1213 }
1214
1215 // store carryover raw samples,
1216 // the others channel raw samples are stored by the calling function.
1217 415 memmove(ctx->raw_samples[c] - sconf->max_order,
1218 415 ctx->raw_samples[c] - sconf->max_order + sconf->frame_length,
1219 415 sizeof(*ctx->raw_samples[c]) * sconf->max_order);
1220
1221 415 return 0;
1222 ✗ fail:
1223 // damaged block, write zero for the rest of the frame
1224 ✗ zero_remaining(b, ctx->num_blocks, div_blocks, bd[0].raw_samples);
1225 ✗ zero_remaining(b, ctx->num_blocks, div_blocks, bd[1].raw_samples);
1226 ✗ return ret;
1227 }
1228
1229 5721 static inline int als_weighting(GetBitContext *gb, int k, int off)
1230 {
1231 5721 int idx = av_clip(decode_rice(gb, k) + off,
1232 0, FF_ARRAY_ELEMS(mcc_weightings) - 1);
1233 5721 return mcc_weightings[idx];
1234 }
1235
1236 /** Read the channel data.
1237 */
1238 1722 static int read_channel_data(ALSDecContext *ctx, ALSChannelData *cd, int c)
1239 {
1240 1722 GetBitContext *gb = &ctx->gb;
1241 1722 ALSChannelData *current = cd;
1242 1722 unsigned int channels = ctx->avctx->ch_layout.nb_channels;
1243 1722 int entries = 0;
1244
1245
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 2948 while (entries < channels && !(current->stop_flag = get_bits1(gb))) {
1246 1226 current->master_channel = get_bits_long(gb, av_ceil_log2(channels));
1247
1248
1/2
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 1226 if (current->master_channel >= channels) {
1249 ✗ av_log(ctx->avctx, AV_LOG_ERROR, "Invalid master channel.\n");
1250 ✗ return AVERROR_INVALIDDATA;
1251 }
1252
1253
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✗ Branch 1 not taken.
 1226 if (current->master_channel != c) {
1254 1226 current->time_diff_flag = get_bits1(gb);
1255 1226 current->weighting[0] = als_weighting(gb, 1, 16);
1256 1226 current->weighting[1] = als_weighting(gb, 2, 14);
1257 1226 current->weighting[2] = als_weighting(gb, 1, 16);
1258
1259
2/2
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 1226 if (current->time_diff_flag) {
1260 681 current->weighting[3] = als_weighting(gb, 1, 16);
1261 681 current->weighting[4] = als_weighting(gb, 1, 16);
1262 681 current->weighting[5] = als_weighting(gb, 1, 16);
1263
1264 681 current->time_diff_sign = get_bits1(gb);
1265 681 current->time_diff_index = get_bits(gb, ctx->ltp_lag_length - 3) + 3;
1266 }
1267 }
1268
1269 1226 current++;
1270 1226 entries++;
1271 }
1272
1273
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 1722 if (entries == channels) {
1274 ✗ av_log(ctx->avctx, AV_LOG_ERROR, "Damaged channel data.\n");
1275 ✗ return AVERROR_INVALIDDATA;
1276 }
1277
1278 1722 align_get_bits(gb);
1279 1722 return 0;
1280 }
1281
1282
1283 /** Recursively reverts the inter-channel correlation for a block.
1284 */
1285 2948 static int revert_channel_correlation(ALSDecContext *ctx, ALSBlockData *bd,
1286 ALSChannelData **cd, int *reverted,
1287 unsigned int offset, int c)
1288 {
1289 2948 ALSChannelData *ch = cd[c];
1290 2948 unsigned int dep = 0;
1291 2948 unsigned int channels = ctx->avctx->ch_layout.nb_channels;
1292 2948 unsigned int channel_size = ctx->sconf.frame_length + ctx->sconf.max_order;
1293
1294
2/2
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 2948 if (reverted[c])
1295 1226 return 0;
1296
1297 1722 reverted[c] = 1;
1298
1299
3/4
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✓ Branch 2 taken 1226 times.
✓ Branch 3 taken 1722 times.
 2948 while (dep < channels && !ch[dep].stop_flag) {
1300 1226 revert_channel_correlation(ctx, bd, cd, reverted, offset,
1301 1226 ch[dep].master_channel);
1302
1303 1226 dep++;
1304 }
1305
1306
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 1722 if (dep == channels) {
1307 ✗ av_log(ctx->avctx, AV_LOG_WARNING, "Invalid channel correlation.\n");
1308 ✗ return AVERROR_INVALIDDATA;
1309 }
1310
1311 1722 bd->const_block = ctx->const_block + c;
1312 1722 bd->shift_lsbs = ctx->shift_lsbs + c;
1313 1722 bd->opt_order = ctx->opt_order + c;
1314 1722 bd->store_prev_samples = ctx->store_prev_samples + c;
1315 1722 bd->use_ltp = ctx->use_ltp + c;
1316 1722 bd->ltp_lag = ctx->ltp_lag + c;
1317 1722 bd->ltp_gain = ctx->ltp_gain[c];
1318 1722 bd->lpc_cof = ctx->lpc_cof[c];
1319 1722 bd->quant_cof = ctx->quant_cof[c];
1320 1722 bd->raw_samples = ctx->raw_samples[c] + offset;
1321
1322
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 2948 for (dep = 0; !ch[dep].stop_flag; dep++) {
1323 ptrdiff_t smp;
1324 1226 ptrdiff_t begin = 1;
1325 1226 ptrdiff_t end = bd->block_length - 1;
1326 int64_t y;
1327 1226 int32_t *master = ctx->raw_samples[ch[dep].master_channel] + offset;
1328
1329
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 1226 if (ch[dep].master_channel == c)
1330 ✗ continue;
1331
1332
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 1226 if (ch[dep].time_diff_flag) {
1333 681 int t = ch[dep].time_diff_index;
1334
1335
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 681 if (ch[dep].time_diff_sign) {
1336 313 t = -t;
1337
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 313 if (begin < t) {
1338 ✗ av_log(ctx->avctx, AV_LOG_ERROR, "begin %"PTRDIFF_SPECIFIER" smaller than time diff index %d.\n", begin, t);
1339 ✗ return AVERROR_INVALIDDATA;
1340 }
1341 313 begin -= t;
1342 } else {
1343
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 368 if (end < t) {
1344 ✗ av_log(ctx->avctx, AV_LOG_ERROR, "end %"PTRDIFF_SPECIFIER" smaller than time diff index %d.\n", end, t);
1345 ✗ return AVERROR_INVALIDDATA;
1346 }
1347 368 end -= t;
1348 }
1349
1350
3/4
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✗ Branch 3 not taken.
 681 if (FFMIN(begin - 1, begin - 1 + t) < ctx->raw_buffer - master ||
1351
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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) {
1352 ✗ av_log(ctx->avctx, AV_LOG_ERROR,
1353 "sample pointer range [%p, %p] not contained in raw_buffer [%p, %p].\n",
1354 ✗ master + FFMIN(begin - 1, begin - 1 + t), master + FFMAX(end + 1, end + 1 + t),
1355 ✗ ctx->raw_buffer, ctx->raw_buffer + channels * channel_size);
1356 ✗ return AVERROR_INVALIDDATA;
1357 }
1358
1359
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 1845643 for (smp = begin; smp < end; smp++) {
1360 1844962 y = (1 << 6) +
1361 1844962 MUL64(ch[dep].weighting[0], master[smp - 1 ]) +
1362 1844962 MUL64(ch[dep].weighting[1], master[smp ]) +
1363 1844962 MUL64(ch[dep].weighting[2], master[smp + 1 ]) +
1364 1844962 MUL64(ch[dep].weighting[3], master[smp - 1 + t]) +
1365 1844962 MUL64(ch[dep].weighting[4], master[smp + t]) +
1366 1844962 MUL64(ch[dep].weighting[5], master[smp + 1 + t]);
1367
1368 1844962 bd->raw_samples[smp] += y >> 7;
1369 }
1370 } else {
1371
1372
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 545 if (begin - 1 < ctx->raw_buffer - master ||
1373
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 545 end + 1 > ctx->raw_buffer + channels * channel_size - master) {
1374 ✗ av_log(ctx->avctx, AV_LOG_ERROR,
1375 "sample pointer range [%p, %p] not contained in raw_buffer [%p, %p].\n",
1376 ✗ master + begin - 1, master + end + 1,
1377 ✗ ctx->raw_buffer, ctx->raw_buffer + channels * channel_size);
1378 ✗ return AVERROR_INVALIDDATA;
1379 }
1380
1381
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 1568069 for (smp = begin; smp < end; smp++) {
1382 1567524 y = (1 << 6) +
1383 1567524 MUL64(ch[dep].weighting[0], master[smp - 1]) +
1384 1567524 MUL64(ch[dep].weighting[1], master[smp ]) +
1385 1567524 MUL64(ch[dep].weighting[2], master[smp + 1]);
1386
1387 1567524 bd->raw_samples[smp] += y >> 7;
1388 }
1389 }
1390 }
1391
1392 1722 return 0;
1393 }
1394
1395
1396 /** multiply two softfloats and handle the rounding off
1397 */
1398 ✗ static SoftFloat_IEEE754 multiply(SoftFloat_IEEE754 a, SoftFloat_IEEE754 b) {
1399 uint64_t mantissa_temp;
1400 uint64_t mask_64;
1401 int cutoff_bit_count;
1402 unsigned char last_2_bits;
1403 unsigned int mantissa;
1404 int32_t sign;
1405 ✗ uint32_t return_val = 0;
1406 ✗ int bit_count = 48;
1407
1408 ✗ sign = a.sign ^ b.sign;
1409
1410 // Multiply mantissa bits in a 64-bit register
1411 ✗ mantissa_temp = (uint64_t)a.mant * (uint64_t)b.mant;
1412 ✗ mask_64 = (uint64_t)0x1 << 47;
1413
1414 ✗ if (!mantissa_temp)
1415 ✗ return FLOAT_0;
1416
1417 // Count the valid bit count
1418 ✗ while (!(mantissa_temp & mask_64) && mask_64) {
1419 ✗ bit_count--;
1420 ✗ mask_64 >>= 1;
1421 }
1422
1423 // Round off
1424 ✗ cutoff_bit_count = bit_count - 24;
1425 ✗ if (cutoff_bit_count > 0) {
1426 ✗ last_2_bits = (unsigned char)(((unsigned int)mantissa_temp >> (cutoff_bit_count - 1)) & 0x3 );
1427 ✗ if ((last_2_bits == 0x3) || ((last_2_bits == 0x1) && ((unsigned int)mantissa_temp & ((0x1UL << (cutoff_bit_count - 1)) - 1)))) {
1428 // Need to round up
1429 ✗ mantissa_temp += (uint64_t)0x1 << cutoff_bit_count;
1430 }
1431 }
1432
1433 ✗ if (cutoff_bit_count >= 0) {
1434 ✗ mantissa = (unsigned int)(mantissa_temp >> cutoff_bit_count);
1435 } else {
1436 ✗ mantissa = (unsigned int)(mantissa_temp <<-cutoff_bit_count);
1437 }
1438
1439 // Need one more shift?
1440 ✗ if (mantissa & 0x01000000ul) {
1441 ✗ bit_count++;
1442 ✗ mantissa >>= 1;
1443 }
1444
1445 ✗ if (!sign) {
1446 ✗ return_val = 0x80000000U;
1447 }
1448
1449 ✗ return_val |= ((unsigned)av_clip(a.exp + b.exp + bit_count - 47, -126, 127) << 23) & 0x7F800000;
1450 ✗ return_val |= mantissa;
1451 ✗ return av_bits2sf_ieee754(return_val);
1452 }
1453
1454
1455 /** Read and decode the floating point sample data
1456 */
1457 ✗ static int read_diff_float_data(ALSDecContext *ctx, unsigned int ra_frame) {
1458 ✗ AVCodecContext *avctx = ctx->avctx;
1459 ✗ GetBitContext *gb = &ctx->gb;
1460 ✗ SoftFloat_IEEE754 *acf = ctx->acf;
1461 ✗ int *shift_value = ctx->shift_value;
1462 ✗ int *last_shift_value = ctx->last_shift_value;
1463 ✗ int *last_acf_mantissa = ctx->last_acf_mantissa;
1464 ✗ int **raw_mantissa = ctx->raw_mantissa;
1465 ✗ int *nbits = ctx->nbits;
1466 ✗ unsigned char *larray = ctx->larray;
1467 ✗ int frame_length = ctx->cur_frame_length;
1468 ✗ SoftFloat_IEEE754 scale = av_int2sf_ieee754(0x1u, 23);
1469 unsigned int partA_flag;
1470 unsigned int highest_byte;
1471 unsigned int shift_amp;
1472 uint32_t tmp_32;
1473 int use_acf;
1474 int nchars;
1475 int i;
1476 int c;
1477 long k;
1478 long nbits_aligned;
1479 unsigned long acc;
1480 unsigned long j;
1481 uint32_t sign;
1482 uint32_t e;
1483 uint32_t mantissa;
1484
1485 ✗ skip_bits_long(gb, 32); //num_bytes_diff_float
1486 ✗ use_acf = get_bits1(gb);
1487
1488 ✗ if (ra_frame) {
1489 ✗ memset(last_acf_mantissa, 0, avctx->ch_layout.nb_channels * sizeof(*last_acf_mantissa));
1490 ✗ memset(last_shift_value, 0, avctx->ch_layout.nb_channels * sizeof(*last_shift_value) );
1491 ✗ ff_mlz_flush_dict(ctx->mlz);
1492 }
1493
1494 ✗ if (avctx->ch_layout.nb_channels * 8 > get_bits_left(gb))
1495 ✗ return AVERROR_INVALIDDATA;
1496
1497 ✗ for (c = 0; c < avctx->ch_layout.nb_channels; ++c) {
1498 ✗ if (use_acf) {
1499 //acf_flag
1500 ✗ if (get_bits1(gb)) {
1501 ✗ tmp_32 = get_bits(gb, 23);
1502 ✗ last_acf_mantissa[c] = tmp_32;
1503 } else {
1504 ✗ tmp_32 = last_acf_mantissa[c];
1505 }
1506 ✗ acf[c] = av_bits2sf_ieee754(tmp_32);
1507 } else {
1508 ✗ acf[c] = FLOAT_1;
1509 }
1510
1511 ✗ highest_byte = get_bits(gb, 2);
1512 ✗ partA_flag = get_bits1(gb);
1513 ✗ shift_amp = get_bits1(gb);
1514
1515 ✗ if (shift_amp) {
1516 ✗ shift_value[c] = get_bits(gb, 8);
1517 ✗ last_shift_value[c] = shift_value[c];
1518 } else {
1519 ✗ shift_value[c] = last_shift_value[c];
1520 }
1521
1522 ✗ if (partA_flag) {
1523 ✗ if (!get_bits1(gb)) { //uncompressed
1524 ✗ for (i = 0; i < frame_length; ++i) {
1525 ✗ if (ctx->raw_samples[c][i] == 0) {
1526 ✗ ctx->raw_mantissa[c][i] = get_bits_long(gb, 32);
1527 }
1528 }
1529 } else { //compressed
1530 ✗ nchars = 0;
1531 ✗ for (i = 0; i < frame_length; ++i) {
1532 ✗ if (ctx->raw_samples[c][i] == 0) {
1533 ✗ nchars += 4;
1534 }
1535 }
1536
1537 ✗ tmp_32 = ff_mlz_decompression(ctx->mlz, gb, nchars, larray);
1538 ✗ if(tmp_32 != nchars) {
1539 ✗ av_log(ctx->avctx, AV_LOG_ERROR, "Error in MLZ decompression (%"PRId32", %d).\n", tmp_32, nchars);
1540 ✗ return AVERROR_INVALIDDATA;
1541 }
1542
1543 ✗ for (i = 0; i < frame_length; ++i) {
1544 ✗ ctx->raw_mantissa[c][i] = AV_RB32(larray);
1545 }
1546 }
1547 }
1548
1549 //decode part B
1550 ✗ if (highest_byte) {
1551 ✗ for (i = 0; i < frame_length; ++i) {
1552 ✗ if (ctx->raw_samples[c][i] != 0) {
1553 //The following logic is taken from Tabel 14.45 and 14.46 from the ISO spec
1554 ✗ if (av_cmp_sf_ieee754(acf[c], FLOAT_1)) {
1555 ✗ nbits[i] = 23 - av_log2(abs(ctx->raw_samples[c][i]));
1556 } else {
1557 ✗ nbits[i] = 23;
1558 }
1559 ✗ nbits[i] = FFMIN(nbits[i], highest_byte*8);
1560 }
1561 }
1562
1563 ✗ if (!get_bits1(gb)) { //uncompressed
1564 ✗ for (i = 0; i < frame_length; ++i) {
1565 ✗ if (ctx->raw_samples[c][i] != 0) {
1566 ✗ raw_mantissa[c][i] = get_bitsz(gb, nbits[i]);
1567 }
1568 }
1569 } else { //compressed
1570 ✗ nchars = 0;
1571 ✗ for (i = 0; i < frame_length; ++i) {
1572 ✗ if (ctx->raw_samples[c][i]) {
1573 ✗ nchars += (int) nbits[i] / 8;
1574 ✗ if (nbits[i] & 7) {
1575 ✗ ++nchars;
1576 }
1577 }
1578 }
1579
1580 ✗ tmp_32 = ff_mlz_decompression(ctx->mlz, gb, nchars, larray);
1581 ✗ if(tmp_32 != nchars) {
1582 ✗ av_log(ctx->avctx, AV_LOG_ERROR, "Error in MLZ decompression (%"PRId32", %d).\n", tmp_32, nchars);
1583 ✗ return AVERROR_INVALIDDATA;
1584 }
1585
1586 ✗ j = 0;
1587 ✗ for (i = 0; i < frame_length; ++i) {
1588 ✗ if (ctx->raw_samples[c][i]) {
1589 ✗ if (nbits[i] & 7) {
1590 ✗ nbits_aligned = 8 * ((unsigned int)(nbits[i] / 8) + 1);
1591 } else {
1592 ✗ nbits_aligned = nbits[i];
1593 }
1594 ✗ acc = 0;
1595 ✗ for (k = 0; k < nbits_aligned/8; ++k) {
1596 ✗ acc = (acc << 8) + larray[j++];
1597 }
1598 ✗ acc >>= (nbits_aligned - nbits[i]);
1599 ✗ raw_mantissa[c][i] = acc;
1600 }
1601 }
1602 }
1603 }
1604
1605 ✗ for (i = 0; i < frame_length; ++i) {
1606 ✗ SoftFloat_IEEE754 pcm_sf = av_int2sf_ieee754(ctx->raw_samples[c][i], 0);
1607 ✗ pcm_sf = av_div_sf_ieee754(pcm_sf, scale);
1608
1609 ✗ if (ctx->raw_samples[c][i] != 0) {
1610 ✗ if (!av_cmp_sf_ieee754(acf[c], FLOAT_1)) {
1611 ✗ pcm_sf = multiply(acf[c], pcm_sf);
1612 }
1613
1614 ✗ sign = pcm_sf.sign;
1615 ✗ e = pcm_sf.exp;
1616 ✗ mantissa = (pcm_sf.mant | 0x800000) + raw_mantissa[c][i];
1617
1618 ✗ while(mantissa >= 0x1000000) {
1619 ✗ e++;
1620 ✗ mantissa >>= 1;
1621 }
1622
1623 ✗ if (mantissa) e += (shift_value[c] - 127);
1624 ✗ mantissa &= 0x007fffffUL;
1625
1626 ✗ tmp_32 = (sign << 31) | ((e + EXP_BIAS) << 23) | (mantissa);
1627 ✗ ctx->raw_samples[c][i] = tmp_32;
1628 } else {
1629 ✗ ctx->raw_samples[c][i] = raw_mantissa[c][i] & 0x007fffffUL;
1630 }
1631 }
1632 ✗ align_get_bits(gb);
1633 }
1634 ✗ return 0;
1635 }
1636
1637
1638 /** Read the frame data.
1639 */
1640 1835 static int read_frame_data(ALSDecContext *ctx, unsigned int ra_frame)
1641 {
1642 1835 ALSSpecificConfig *sconf = &ctx->sconf;
1643 1835 AVCodecContext *avctx = ctx->avctx;
1644 1835 GetBitContext *gb = &ctx->gb;
1645 unsigned int div_blocks[32]; ///< block sizes.
1646 int c;
1647 unsigned int js_blocks[2];
1648 1835 int channels = avctx->ch_layout.nb_channels;
1649 1835 uint32_t bs_info = 0;
1650 int ret;
1651
1652 // skip the size of the ra unit if present in the frame
1653
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 1835 if (sconf->ra_flag == RA_FLAG_FRAMES && ra_frame)
1654 ✗ skip_bits_long(gb, 32);
1655
1656
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 1835 if (sconf->mc_coding && sconf->joint_stereo) {
1657 2 ctx->js_switch = get_bits1(gb);
1658 2 align_get_bits(gb);
1659 }
1660
1661
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 3319 if (!sconf->mc_coding || ctx->js_switch) {
1662 1484 int independent_bs = !sconf->joint_stereo;
1663
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 1484 if (get_bits_left(gb) < 7*channels*ctx->num_blocks)
1664 ✗ return AVERROR_INVALIDDATA;
1665
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 4037 for (c = 0; c < channels; c++) {
1666 2553 js_blocks[0] = 0;
1667 2553 js_blocks[1] = 0;
1668
1669 2553 get_block_sizes(ctx, div_blocks, &bs_info);
1670
1671 // if joint_stereo and block_switching is set, independent decoding
1672 // is signaled via the first bit of bs_info
1673
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 2553 if (sconf->joint_stereo && sconf->block_switching)
1674
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 110 if (bs_info >> 31)
1675 22 independent_bs = 2;
1676
1677 // if this is the last channel, it has to be decoded independently
1678
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 2553 if (c == channels - 1 || (c & 1))
1679 1069 independent_bs = 1;
1680
1681
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 2553 if (independent_bs) {
1682 2138 ret = decode_blocks_ind(ctx, ra_frame, c,
1683 div_blocks, js_blocks);
1684
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 2138 if (ret < 0)
1685 ✗ return ret;
1686 2138 independent_bs--;
1687 } else {
1688 415 ret = decode_blocks(ctx, ra_frame, c, div_blocks, js_blocks);
1689
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 415 if (ret < 0)
1690 ✗ return ret;
1691
1692 415 c++;
1693 }
1694
1695 // store carryover raw samples
1696 2553 memmove(ctx->raw_samples[c] - sconf->max_order,
1697 2553 ctx->raw_samples[c] - sconf->max_order + sconf->frame_length,
1698 2553 sizeof(*ctx->raw_samples[c]) * sconf->max_order);
1699 2553 ctx->highest_decoded_channel = c;
1700 }
1701 } else { // multi-channel coding
1702 351 ALSBlockData bd = { 0 };
1703 int b, ret;
1704 351 int *reverted_channels = ctx->reverted_channels;
1705 351 unsigned int offset = 0;
1706
1707
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 2073 for (c = 0; c < channels; c++)
1708
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 1722 if (ctx->chan_data[c] < ctx->chan_data_buffer) {
1709 ✗ av_log(ctx->avctx, AV_LOG_ERROR, "Invalid channel data.\n");
1710 ✗ return AVERROR_INVALIDDATA;
1711 }
1712
1713 351 memset(reverted_channels, 0, sizeof(*reverted_channels) * channels);
1714
1715 351 bd.ra_block = ra_frame;
1716 351 bd.prev_raw_samples = ctx->prev_raw_samples;
1717
1718 351 get_block_sizes(ctx, div_blocks, &bs_info);
1719
1720
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 702 for (b = 0; b < ctx->num_blocks; b++) {
1721 351 bd.block_length = div_blocks[b];
1722
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 351 if (bd.block_length <= 0) {
1723 ✗ av_log(ctx->avctx, AV_LOG_WARNING,
1724 "Invalid block length %u in channel data!\n",
1725 bd.block_length);
1726 ✗ continue;
1727 }
1728
1729
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 2073 for (c = 0; c < channels; c++) {
1730 1722 bd.const_block = ctx->const_block + c;
1731 1722 bd.shift_lsbs = ctx->shift_lsbs + c;
1732 1722 bd.opt_order = ctx->opt_order + c;
1733 1722 bd.store_prev_samples = ctx->store_prev_samples + c;
1734 1722 bd.use_ltp = ctx->use_ltp + c;
1735 1722 bd.ltp_lag = ctx->ltp_lag + c;
1736 1722 bd.ltp_gain = ctx->ltp_gain[c];
1737 1722 bd.lpc_cof = ctx->lpc_cof[c];
1738 1722 bd.quant_cof = ctx->quant_cof[c];
1739 1722 bd.raw_samples = ctx->raw_samples[c] + offset;
1740 1722 bd.raw_other = NULL;
1741
1742
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 1722 if ((ret = read_block(ctx, &bd)) < 0)
1743 ✗ return ret;
1744
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 1722 if ((ret = read_channel_data(ctx, ctx->chan_data[c], c)) < 0)
1745 ✗ return ret;
1746 }
1747
1748
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 2073 for (c = 0; c < channels; c++) {
1749 1722 ret = revert_channel_correlation(ctx, &bd, ctx->chan_data,
1750 reverted_channels, offset, c);
1751
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 1722 if (ret < 0)
1752 ✗ return ret;
1753 }
1754
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 2073 for (c = 0; c < channels; c++) {
1755 1722 bd.const_block = ctx->const_block + c;
1756 1722 bd.shift_lsbs = ctx->shift_lsbs + c;
1757 1722 bd.opt_order = ctx->opt_order + c;
1758 1722 bd.store_prev_samples = ctx->store_prev_samples + c;
1759 1722 bd.use_ltp = ctx->use_ltp + c;
1760 1722 bd.ltp_lag = ctx->ltp_lag + c;
1761 1722 bd.ltp_gain = ctx->ltp_gain[c];
1762 1722 bd.lpc_cof = ctx->lpc_cof[c];
1763 1722 bd.quant_cof = ctx->quant_cof[c];
1764 1722 bd.raw_samples = ctx->raw_samples[c] + offset;
1765
1766
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 1722 if ((ret = decode_block(ctx, &bd)) < 0)
1767 ✗ return ret;
1768
1769 1722 ctx->highest_decoded_channel = FFMAX(ctx->highest_decoded_channel, c);
1770 }
1771
1772 351 memset(reverted_channels, 0, channels * sizeof(*reverted_channels));
1773 351 offset += div_blocks[b];
1774 351 bd.ra_block = 0;
1775 }
1776
1777 // store carryover raw samples
1778
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 2073 for (c = 0; c < channels; c++)
1779 1722 memmove(ctx->raw_samples[c] - sconf->max_order,
1780 1722 ctx->raw_samples[c] - sconf->max_order + sconf->frame_length,
1781 1722 sizeof(*ctx->raw_samples[c]) * sconf->max_order);
1782 }
1783
1784
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 1835 if (sconf->floating) {
1785 ✗ read_diff_float_data(ctx, ra_frame);
1786 }
1787
1788
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 1835 if (get_bits_left(gb) < 0) {
1789 ✗ av_log(ctx->avctx, AV_LOG_ERROR, "Overread %d\n", -get_bits_left(gb));
1790 ✗ return AVERROR_INVALIDDATA;
1791 }
1792
1793 1835 return 0;
1794 }
1795
1796
1797 /** Decode an ALS frame.
1798 */
1799 1835 static int decode_frame(AVCodecContext *avctx, AVFrame *frame,
1800 int *got_frame_ptr, AVPacket *avpkt)
1801 {
1802 1835 ALSDecContext *ctx = avctx->priv_data;
1803 1835 ALSSpecificConfig *sconf = &ctx->sconf;
1804 1835 const uint8_t *buffer = avpkt->data;
1805 1835 int buffer_size = avpkt->size;
1806 int invalid_frame, ret;
1807 1835 int channels = avctx->ch_layout.nb_channels;
1808 unsigned int c, sample, ra_frame, bytes_read, shift;
1809
1810
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 1835 if ((ret = init_get_bits8(&ctx->gb, buffer, buffer_size)) < 0)
1811 ✗ return ret;
1812
1813 // In the case that the distance between random access frames is set to zero
1814 // (sconf->ra_distance == 0) no frame is treated as a random access frame.
1815 // For the first frame, if prediction is used, all samples used from the
1816 // previous frame are assumed to be zero.
1817
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 1835 ra_frame = sconf->ra_distance && !(ctx->frame_id % sconf->ra_distance);
1818
1819 // the last frame to decode might have a different length
1820
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 1835 if (sconf->samples != 0xFFFFFFFF)
1821 1835 ctx->cur_frame_length = FFMIN(sconf->samples - ctx->frame_id * (uint64_t) sconf->frame_length,
1822 sconf->frame_length);
1823 else
1824 ✗ ctx->cur_frame_length = sconf->frame_length;
1825
1826 1835 ctx->highest_decoded_channel = -1;
1827 // decode the frame data
1828
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 1835 if ((invalid_frame = read_frame_data(ctx, ra_frame)) < 0)
1829 ✗ av_log(ctx->avctx, AV_LOG_WARNING,
1830 "Reading frame data failed. Skipping RA unit.\n");
1831
1832
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 1835 if (ctx->highest_decoded_channel == -1) {
1833 ✗ av_log(ctx->avctx, AV_LOG_WARNING,
1834 "No channel data decoded.\n");
1835 ✗ return AVERROR_INVALIDDATA;
1836 }
1837
1838 1835 ctx->frame_id++;
1839
1840 /* get output buffer */
1841 1835 frame->nb_samples = ctx->cur_frame_length;
1842
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 1835 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
1843 ✗ return ret;
1844
1845 // transform decoded frame into output format
1846 #define INTERLEAVE_OUTPUT(bps) \
1847 { \
1848 int##bps##_t *dest = (int##bps##_t*)frame->data[0]; \
1849 int32_t *raw_samples = ctx->raw_samples[0]; \
1850 int raw_step = channels > 1 ? ctx->raw_samples[1] - raw_samples : 1; \
1851 shift = bps - ctx->avctx->bits_per_raw_sample; \
1852 if (!ctx->cs_switch) { \
1853 for (sample = 0; sample < ctx->cur_frame_length; sample++) \
1854 for (c = 0; c < channels; c++) \
1855 *dest++ = raw_samples[c*raw_step + sample] * (1U << shift); \
1856 } else { \
1857 for (sample = 0; sample < ctx->cur_frame_length; sample++) \
1858 for (c = 0; c < channels; c++) \
1859 *dest++ = raw_samples[sconf->chan_pos[c]*raw_step + sample] * (1U << shift);\
1860 } \
1861 }
1862
1863
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 1835 if (ctx->avctx->bits_per_raw_sample <= 16) {
1864
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 16014599 INTERLEAVE_OUTPUT(16)
1865 } else {
1866 ✗ INTERLEAVE_OUTPUT(32)
1867 }
1868
1869 // update CRC
1870
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 1835 if (sconf->crc_enabled && (avctx->err_recognition & (AV_EF_CRCCHECK|AV_EF_CAREFUL))) {
1871 ✗ int swap = HAVE_BIGENDIAN != sconf->msb_first;
1872
1873 ✗ if (ctx->avctx->bits_per_raw_sample == 24) {
1874 ✗ int32_t *src = (int32_t *)frame->data[0];
1875
1876 ✗ for (sample = 0;
1877 ✗ sample < ctx->cur_frame_length * channels;
1878 ✗ sample++) {
1879 int32_t v;
1880
1881 ✗ if (swap)
1882 ✗ v = av_bswap32(src[sample]);
1883 else
1884 ✗ v = src[sample];
1885 if (!HAVE_BIGENDIAN)
1886 ✗ v >>= 8;
1887
1888 ✗ ctx->crc = av_crc(ctx->crc_table, ctx->crc, (uint8_t*)(&v), 3);
1889 }
1890 } else {
1891 uint8_t *crc_source;
1892
1893 ✗ if (swap) {
1894 ✗ if (ctx->avctx->bits_per_raw_sample <= 16) {
1895 ✗ int16_t *src = (int16_t*) frame->data[0];
1896 ✗ int16_t *dest = (int16_t*) ctx->crc_buffer;
1897 ✗ for (sample = 0;
1898 ✗ sample < ctx->cur_frame_length * channels;
1899 ✗ sample++)
1900 ✗ *dest++ = av_bswap16(src[sample]);
1901 } else {
1902 ✗ ctx->bdsp.bswap_buf((uint32_t *) ctx->crc_buffer,
1903 ✗ (uint32_t *) frame->data[0],
1904 ✗ ctx->cur_frame_length * channels);
1905 }
1906 ✗ crc_source = ctx->crc_buffer;
1907 } else {
1908 ✗ crc_source = frame->data[0];
1909 }
1910
1911 ✗ ctx->crc = av_crc(ctx->crc_table, ctx->crc, crc_source,
1912 ✗ ctx->cur_frame_length * channels *
1913 ✗ av_get_bytes_per_sample(avctx->sample_fmt));
1914 }
1915
1916
1917 // check CRC sums if this is the last frame
1918 ✗ if (ctx->cur_frame_length != sconf->frame_length &&
1919 ✗ ctx->crc_org != ctx->crc) {
1920 ✗ av_log(avctx, AV_LOG_ERROR, "CRC error.\n");
1921 ✗ if (avctx->err_recognition & AV_EF_EXPLODE)
1922 ✗ return AVERROR_INVALIDDATA;
1923 }
1924 }
1925
1926 1835 *got_frame_ptr = 1;
1927
1928
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 1835 bytes_read = invalid_frame ? buffer_size :
1929 1835 (get_bits_count(&ctx->gb) + 7) >> 3;
1930
1931 1835 return bytes_read;
1932 }
1933
1934
1935 /** Uninitialize the ALS decoder.
1936 */
1937 14 static av_cold int decode_end(AVCodecContext *avctx)
1938 {
1939 14 ALSDecContext *ctx = avctx->priv_data;
1940 int i;
1941
1942 14 av_freep(&ctx->sconf.chan_pos);
1943
1944 14 ff_bgmc_end(&ctx->bgmc_lut, &ctx->bgmc_lut_status);
1945
1946 14 av_freep(&ctx->const_block);
1947 14 av_freep(&ctx->shift_lsbs);
1948 14 av_freep(&ctx->opt_order);
1949 14 av_freep(&ctx->store_prev_samples);
1950 14 av_freep(&ctx->use_ltp);
1951 14 av_freep(&ctx->ltp_lag);
1952 14 av_freep(&ctx->ltp_gain);
1953 14 av_freep(&ctx->ltp_gain_buffer);
1954 14 av_freep(&ctx->quant_cof);
1955 14 av_freep(&ctx->lpc_cof);
1956 14 av_freep(&ctx->quant_cof_buffer);
1957 14 av_freep(&ctx->lpc_cof_buffer);
1958 14 av_freep(&ctx->lpc_cof_reversed_buffer);
1959 14 av_freep(&ctx->prev_raw_samples);
1960 14 av_freep(&ctx->raw_samples);
1961 14 av_freep(&ctx->raw_buffer);
1962 14 av_freep(&ctx->chan_data);
1963 14 av_freep(&ctx->chan_data_buffer);
1964 14 av_freep(&ctx->reverted_channels);
1965 14 av_freep(&ctx->crc_buffer);
1966
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 14 if (ctx->mlz) {
1967 ✗ av_freep(&ctx->mlz->dict);
1968 ✗ av_freep(&ctx->mlz);
1969 }
1970 14 av_freep(&ctx->acf);
1971 14 av_freep(&ctx->last_acf_mantissa);
1972 14 av_freep(&ctx->shift_value);
1973 14 av_freep(&ctx->last_shift_value);
1974
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 14 if (ctx->raw_mantissa) {
1975 ✗ for (i = 0; i < avctx->ch_layout.nb_channels; i++) {
1976 ✗ av_freep(&ctx->raw_mantissa[i]);
1977 }
1978 ✗ av_freep(&ctx->raw_mantissa);
1979 }
1980 14 av_freep(&ctx->larray);
1981 14 av_freep(&ctx->nbits);
1982
1983 14 return 0;
1984 }
1985
1986
1987 /** Initialize the ALS decoder.
1988 */
1989 14 static av_cold int decode_init(AVCodecContext *avctx)
1990 {
1991 unsigned int c;
1992 unsigned int channel_size;
1993 int num_buffers, ret;
1994 int channels;
1995 14 ALSDecContext *ctx = avctx->priv_data;
1996 14 ALSSpecificConfig *sconf = &ctx->sconf;
1997 14 ctx->avctx = avctx;
1998
1999
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 14 if (!avctx->extradata) {
2000 ✗ av_log(avctx, AV_LOG_ERROR, "Missing required ALS extradata.\n");
2001 ✗ return AVERROR_INVALIDDATA;
2002 }
2003
2004
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 14 if ((ret = read_specific_config(ctx)) < 0) {
2005 ✗ av_log(avctx, AV_LOG_ERROR, "Reading ALSSpecificConfig failed.\n");
2006 ✗ return ret;
2007 }
2008 14 channels = avctx->ch_layout.nb_channels;
2009
2010
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 14 if ((ret = check_specific_config(ctx)) < 0) {
2011 ✗ return ret;
2012 }
2013
2014
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 14 if (sconf->bgmc) {
2015 4 ret = ff_bgmc_init(avctx, &ctx->bgmc_lut, &ctx->bgmc_lut_status);
2016
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 4 if (ret < 0)
2017 ✗ return ret;
2018 }
2019
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 14 if (sconf->floating) {
2020 ✗ avctx->sample_fmt = AV_SAMPLE_FMT_FLT;
2021 ✗ avctx->bits_per_raw_sample = 32;
2022 } else {
2023 28 avctx->sample_fmt = sconf->resolution > 1
2024
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 14 ? AV_SAMPLE_FMT_S32 : AV_SAMPLE_FMT_S16;
2025 14 avctx->bits_per_raw_sample = (sconf->resolution + 1) * 8;
2026
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 14 if (avctx->bits_per_raw_sample > 32) {
2027 ✗ av_log(avctx, AV_LOG_ERROR, "Bits per raw sample %d larger than 32.\n",
2028 avctx->bits_per_raw_sample);
2029 ✗ return AVERROR_INVALIDDATA;
2030 }
2031 }
2032
2033 // set maximum Rice parameter for progressive decoding based on resolution
2034 // This is not specified in 14496-3 but actually done by the reference
2035 // codec RM22 revision 2.
2036
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 14 ctx->s_max = sconf->resolution > 1 ? 31 : 15;
2037
2038 // set lag value for long-term prediction
2039
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 14 ctx->ltp_lag_length = 8 + (avctx->sample_rate >= 96000) +
2040 14 (avctx->sample_rate >= 192000);
2041
2042 // allocate quantized parcor coefficient buffer
2043
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 14 num_buffers = sconf->mc_coding ? channels : 1;
2044
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 14 if (num_buffers * (uint64_t)num_buffers > INT_MAX) // protect chan_data_buffer allocation
2045 ✗ return AVERROR_INVALIDDATA;
2046
2047 14 ctx->quant_cof = av_malloc_array(num_buffers, sizeof(*ctx->quant_cof));
2048 14 ctx->lpc_cof = av_malloc_array(num_buffers, sizeof(*ctx->lpc_cof));
2049 14 ctx->quant_cof_buffer = av_malloc_array(num_buffers * sconf->max_order,
2050 sizeof(*ctx->quant_cof_buffer));
2051 14 ctx->lpc_cof_buffer = av_malloc_array(num_buffers * sconf->max_order,
2052 sizeof(*ctx->lpc_cof_buffer));
2053 14 ctx->lpc_cof_reversed_buffer = av_malloc_array(sconf->max_order,
2054 sizeof(*ctx->lpc_cof_buffer));
2055
2056
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 14 if (!ctx->quant_cof || !ctx->lpc_cof ||
2057
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 14 !ctx->quant_cof_buffer || !ctx->lpc_cof_buffer ||
2058
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 14 !ctx->lpc_cof_reversed_buffer) {
2059 ✗ av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
2060 ✗ return AVERROR(ENOMEM);
2061 }
2062
2063 // assign quantized parcor coefficient buffers
2064
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 1052 for (c = 0; c < num_buffers; c++) {
2065 1038 ctx->quant_cof[c] = ctx->quant_cof_buffer + c * sconf->max_order;
2066 1038 ctx->lpc_cof[c] = ctx->lpc_cof_buffer + c * sconf->max_order;
2067 }
2068
2069 // allocate and assign lag and gain data buffer for ltp mode
2070 14 ctx->const_block = av_malloc_array(num_buffers, sizeof(*ctx->const_block));
2071 14 ctx->shift_lsbs = av_malloc_array(num_buffers, sizeof(*ctx->shift_lsbs));
2072 14 ctx->opt_order = av_malloc_array(num_buffers, sizeof(*ctx->opt_order));
2073 14 ctx->store_prev_samples = av_malloc_array(num_buffers, sizeof(*ctx->store_prev_samples));
2074 14 ctx->use_ltp = av_calloc(num_buffers, sizeof(*ctx->use_ltp));
2075 14 ctx->ltp_lag = av_malloc_array(num_buffers, sizeof(*ctx->ltp_lag));
2076 14 ctx->ltp_gain = av_malloc_array(num_buffers, sizeof(*ctx->ltp_gain));
2077 14 ctx->ltp_gain_buffer = av_malloc_array(num_buffers * 5, sizeof(*ctx->ltp_gain_buffer));
2078
2079
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 14 if (!ctx->const_block || !ctx->shift_lsbs ||
2080
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 14 !ctx->opt_order || !ctx->store_prev_samples ||
2081
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 14 !ctx->use_ltp || !ctx->ltp_lag ||
2082
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 14 !ctx->ltp_gain || !ctx->ltp_gain_buffer) {
2083 ✗ av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
2084 ✗ return AVERROR(ENOMEM);
2085 }
2086
2087
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 1052 for (c = 0; c < num_buffers; c++)
2088 1038 ctx->ltp_gain[c] = ctx->ltp_gain_buffer + c * 5;
2089
2090 // allocate and assign channel data buffer for mcc mode
2091
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 14 if (sconf->mc_coding) {
2092 4 ctx->chan_data_buffer = av_calloc(num_buffers * num_buffers,
2093 sizeof(*ctx->chan_data_buffer));
2094 4 ctx->chan_data = av_calloc(num_buffers, sizeof(*ctx->chan_data));
2095 4 ctx->reverted_channels = av_malloc_array(num_buffers,
2096 sizeof(*ctx->reverted_channels));
2097
2098
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 4 if (!ctx->chan_data_buffer || !ctx->chan_data || !ctx->reverted_channels) {
2099 ✗ av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
2100 ✗ return AVERROR(ENOMEM);
2101 }
2102
2103
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 1032 for (c = 0; c < num_buffers; c++)
2104 1028 ctx->chan_data[c] = ctx->chan_data_buffer + c * num_buffers;
2105 } else {
2106 10 ctx->chan_data = NULL;
2107 10 ctx->chan_data_buffer = NULL;
2108 10 ctx->reverted_channels = NULL;
2109 }
2110
2111
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 14 if (sconf->floating) {
2112 ✗ ctx->acf = av_malloc_array(channels, sizeof(*ctx->acf));
2113 ✗ ctx->shift_value = av_calloc(channels, sizeof(*ctx->shift_value));
2114 ✗ ctx->last_shift_value = av_calloc(channels, sizeof(*ctx->last_shift_value));
2115 ✗ ctx->last_acf_mantissa = av_calloc(channels, sizeof(*ctx->last_acf_mantissa));
2116 ✗ ctx->raw_mantissa = av_calloc(channels, sizeof(*ctx->raw_mantissa));
2117
2118 ✗ ctx->larray = av_malloc_array(ctx->cur_frame_length * 4, sizeof(*ctx->larray));
2119 ✗ ctx->nbits = av_malloc_array(ctx->cur_frame_length, sizeof(*ctx->nbits));
2120 ✗ ctx->mlz = av_mallocz(sizeof(*ctx->mlz));
2121
2122 ✗ if (!ctx->mlz || !ctx->acf || !ctx->shift_value || !ctx->last_shift_value
2123 ✗ || !ctx->last_acf_mantissa || !ctx->raw_mantissa) {
2124 ✗ av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
2125 ✗ return AVERROR(ENOMEM);
2126 }
2127
2128 ✗ ret = ff_mlz_init_dict(avctx, ctx->mlz);
2129 ✗ if (ret < 0)
2130 ✗ return ret;
2131 ✗ ff_mlz_flush_dict(ctx->mlz);
2132
2133 ✗ for (c = 0; c < channels; ++c) {
2134 ✗ ctx->raw_mantissa[c] = av_calloc(ctx->cur_frame_length, sizeof(**ctx->raw_mantissa));
2135 }
2136 }
2137
2138 14 channel_size = sconf->frame_length + sconf->max_order;
2139
2140 // allocate previous raw sample buffer
2141 14 ctx->prev_raw_samples = av_malloc_array(sconf->max_order, sizeof(*ctx->prev_raw_samples));
2142 14 ctx->raw_buffer = av_calloc(channels * channel_size, sizeof(*ctx->raw_buffer));
2143 14 ctx->raw_samples = av_malloc_array(channels, sizeof(*ctx->raw_samples));
2144
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 14 if (!ctx->prev_raw_samples || !ctx->raw_buffer|| !ctx->raw_samples) {
2145 ✗ av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
2146 ✗ return AVERROR(ENOMEM);
2147 }
2148
2149 // assign raw samples buffers
2150 14 ctx->raw_samples[0] = ctx->raw_buffer + sconf->max_order;
2151
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 1048 for (c = 1; c < channels; c++)
2152 1034 ctx->raw_samples[c] = ctx->raw_samples[c - 1] + channel_size;
2153
2154 // allocate crc buffer
2155
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 14 if (HAVE_BIGENDIAN != sconf->msb_first && sconf->crc_enabled &&
2156 ✗ (avctx->err_recognition & (AV_EF_CRCCHECK|AV_EF_CAREFUL))) {
2157 ✗ ctx->crc_buffer = av_malloc_array(ctx->cur_frame_length *
2158 ✗ channels *
2159 ✗ av_get_bytes_per_sample(avctx->sample_fmt),
2160 sizeof(*ctx->crc_buffer));
2161 ✗ if (!ctx->crc_buffer) {
2162 ✗ av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
2163 ✗ return AVERROR(ENOMEM);
2164 }
2165 }
2166
2167 14 ff_bswapdsp_init(&ctx->bdsp);
2168
2169 14 return 0;
2170 }
2171
2172
2173 /** Flush (reset) the frame ID after seeking.
2174 */
2175 ✗ static av_cold void flush(AVCodecContext *avctx)
2176 {
2177 ✗ ALSDecContext *ctx = avctx->priv_data;
2178
2179 ✗ ctx->frame_id = 0;
2180 ✗ }
2181
2182
2183 const FFCodec ff_als_decoder = {
2184 .p.name = "als",
2185 CODEC_LONG_NAME("MPEG-4 Audio Lossless Coding (ALS)"),
2186 .p.type = AVMEDIA_TYPE_AUDIO,
2187 .p.id = AV_CODEC_ID_MP4ALS,
2188 .priv_data_size = sizeof(ALSDecContext),
2189 .init = decode_init,
2190 .close = decode_end,
2191 FF_CODEC_DECODE_CB(decode_frame),
2192 .flush = flush,
2193 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_CHANNEL_CONF,
2194 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
2195 };
2196