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1 99971952 Thilo Borgmann
/*
2
 * MPEG-4 ALS decoder
3
 * Copyright (c) 2009 Thilo Borgmann <thilo.borgmann _at_ googlemail.com>
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 ba87f080 Diego Biurrun
 * @file
24 99971952 Thilo Borgmann
 * MPEG-4 ALS decoder
25
 * @author Thilo Borgmann <thilo.borgmann _at_ googlemail.com>
26
 */
27
28
29
//#define DEBUG
30
31
32
#include "avcodec.h"
33
#include "get_bits.h"
34
#include "unary.h"
35
#include "mpeg4audio.h"
36
#include "bytestream.h"
37 25608328 Thilo Borgmann
#include "bgmc.h"
38 cbb39648 Thilo Borgmann
#include "dsputil.h"
39 ba7d6e79 Stefano Sabatini
#include "libavcore/samplefmt.h"
40 cbb39648 Thilo Borgmann
#include "libavutil/crc.h"
41 99971952 Thilo Borgmann
42 25c4fdda Thilo Borgmann
#include <stdint.h>
43
44
/** Rice parameters and corresponding index offsets for decoding the
45 2901cc9a Reinhard Tartler
 *  indices of scaled PARCOR values. The table chosen is set globally
46 25c4fdda Thilo Borgmann
 *  by the encoder and stored in ALSSpecificConfig.
47
 */
48
static const int8_t parcor_rice_table[3][20][2] = {
49
    { {-52, 4}, {-29, 5}, {-31, 4}, { 19, 4}, {-16, 4},
50
      { 12, 3}, { -7, 3}, {  9, 3}, { -5, 3}, {  6, 3},
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      { -4, 3}, {  3, 3}, { -3, 2}, {  3, 2}, { -2, 2},
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      {  3, 2}, { -1, 2}, {  2, 2}, { -1, 2}, {  2, 2} },
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    { {-58, 3}, {-42, 4}, {-46, 4}, { 37, 5}, {-36, 4},
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      { 29, 4}, {-29, 4}, { 25, 4}, {-23, 4}, { 20, 4},
55
      {-17, 4}, { 16, 4}, {-12, 4}, { 12, 3}, {-10, 4},
56
      {  7, 3}, { -4, 4}, {  3, 3}, { -1, 3}, {  1, 3} },
57
    { {-59, 3}, {-45, 5}, {-50, 4}, { 38, 4}, {-39, 4},
58
      { 32, 4}, {-30, 4}, { 25, 3}, {-23, 3}, { 20, 3},
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      {-20, 3}, { 16, 3}, {-13, 3}, { 10, 3}, { -7, 3},
60
      {  3, 3}, {  0, 3}, { -1, 3}, {  2, 3}, { -1, 2} }
61
};
62
63
64
/** Scaled PARCOR values used for the first two PARCOR coefficients.
65
 *  To be indexed by the Rice coded indices.
66
 *  Generated by: parcor_scaled_values[i] = 32 + ((i * (i+1)) << 7) - (1 << 20)
67
 *  Actual values are divided by 32 in order to be stored in 16 bits.
68
 */
69
static const int16_t parcor_scaled_values[] = {
70
    -1048544 / 32, -1048288 / 32, -1047776 / 32, -1047008 / 32,
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    -1045984 / 32, -1044704 / 32, -1043168 / 32, -1041376 / 32,
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    -1039328 / 32, -1037024 / 32, -1034464 / 32, -1031648 / 32,
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    -1028576 / 32, -1025248 / 32, -1021664 / 32, -1017824 / 32,
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    -1013728 / 32, -1009376 / 32, -1004768 / 32,  -999904 / 32,
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     -994784 / 32,  -989408 / 32,  -983776 / 32,  -977888 / 32,
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     -971744 / 32,  -965344 / 32,  -958688 / 32,  -951776 / 32,
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     -944608 / 32,  -937184 / 32,  -929504 / 32,  -921568 / 32,
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     -913376 / 32,  -904928 / 32,  -896224 / 32,  -887264 / 32,
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     -878048 / 32,  -868576 / 32,  -858848 / 32,  -848864 / 32,
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     -838624 / 32,  -828128 / 32,  -817376 / 32,  -806368 / 32,
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     -795104 / 32,  -783584 / 32,  -771808 / 32,  -759776 / 32,
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     -747488 / 32,  -734944 / 32,  -722144 / 32,  -709088 / 32,
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     -695776 / 32,  -682208 / 32,  -668384 / 32,  -654304 / 32,
84
     -639968 / 32,  -625376 / 32,  -610528 / 32,  -595424 / 32,
85
     -580064 / 32,  -564448 / 32,  -548576 / 32,  -532448 / 32,
86
     -516064 / 32,  -499424 / 32,  -482528 / 32,  -465376 / 32,
87
     -447968 / 32,  -430304 / 32,  -412384 / 32,  -394208 / 32,
88
     -375776 / 32,  -357088 / 32,  -338144 / 32,  -318944 / 32,
89
     -299488 / 32,  -279776 / 32,  -259808 / 32,  -239584 / 32,
90
     -219104 / 32,  -198368 / 32,  -177376 / 32,  -156128 / 32,
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     -134624 / 32,  -112864 / 32,   -90848 / 32,   -68576 / 32,
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      -46048 / 32,   -23264 / 32,     -224 / 32,    23072 / 32,
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       46624 / 32,    70432 / 32,    94496 / 32,   118816 / 32,
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      143392 / 32,   168224 / 32,   193312 / 32,   218656 / 32,
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      244256 / 32,   270112 / 32,   296224 / 32,   322592 / 32,
96
      349216 / 32,   376096 / 32,   403232 / 32,   430624 / 32,
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      458272 / 32,   486176 / 32,   514336 / 32,   542752 / 32,
98
      571424 / 32,   600352 / 32,   629536 / 32,   658976 / 32,
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      688672 / 32,   718624 / 32,   748832 / 32,   779296 / 32,
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      810016 / 32,   840992 / 32,   872224 / 32,   903712 / 32,
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      935456 / 32,   967456 / 32,   999712 / 32,  1032224 / 32
102
};
103
104
105
/** Gain values of p(0) for long-term prediction.
106
 *  To be indexed by the Rice coded indices.
107
 */
108
static const uint8_t ltp_gain_values [4][4] = {
109
    { 0,  8, 16,  24},
110
    {32, 40, 48,  56},
111
    {64, 70, 76,  82},
112
    {88, 92, 96, 100}
113
};
114
115 99971952 Thilo Borgmann
116 e38215f2 Thilo Borgmann
/** Inter-channel weighting factors for multi-channel correlation.
117
 *  To be indexed by the Rice coded indices.
118
 */
119
static const int16_t mcc_weightings[] = {
120
    204,  192,  179,  166,  153,  140,  128,  115,
121
    102,   89,   76,   64,   51,   38,   25,   12,
122
      0,  -12,  -25,  -38,  -51,  -64,  -76,  -89,
123
   -102, -115, -128, -140, -153, -166, -179, -192
124
};
125
126
127 25608328 Thilo Borgmann
/** Tail codes used in arithmetic coding using block Gilbert-Moore codes.
128
 */
129
static const uint8_t tail_code[16][6] = {
130
    { 74, 44, 25, 13,  7, 3},
131
    { 68, 42, 24, 13,  7, 3},
132
    { 58, 39, 23, 13,  7, 3},
133
    {126, 70, 37, 19, 10, 5},
134
    {132, 70, 37, 20, 10, 5},
135
    {124, 70, 38, 20, 10, 5},
136
    {120, 69, 37, 20, 11, 5},
137
    {116, 67, 37, 20, 11, 5},
138
    {108, 66, 36, 20, 10, 5},
139
    {102, 62, 36, 20, 10, 5},
140
    { 88, 58, 34, 19, 10, 5},
141
    {162, 89, 49, 25, 13, 7},
142
    {156, 87, 49, 26, 14, 7},
143
    {150, 86, 47, 26, 14, 7},
144
    {142, 84, 47, 26, 14, 7},
145
    {131, 79, 46, 26, 14, 7}
146
};
147
148
149 99971952 Thilo Borgmann
enum RA_Flag {
150
    RA_FLAG_NONE,
151
    RA_FLAG_FRAMES,
152
    RA_FLAG_HEADER
153
};
154
155
156
typedef struct {
157
    uint32_t samples;         ///< number of samples, 0xFFFFFFFF if unknown
158
    int resolution;           ///< 000 = 8-bit; 001 = 16-bit; 010 = 24-bit; 011 = 32-bit
159
    int floating;             ///< 1 = IEEE 32-bit floating-point, 0 = integer
160 cbb39648 Thilo Borgmann
    int msb_first;            ///< 1 = original CRC calculated on big-endian system, 0 = little-endian
161 99971952 Thilo Borgmann
    int frame_length;         ///< frame length for each frame (last frame may differ)
162
    int ra_distance;          ///< distance between RA frames (in frames, 0...255)
163
    enum RA_Flag ra_flag;     ///< indicates where the size of ra units is stored
164
    int adapt_order;          ///< adaptive order: 1 = on, 0 = off
165
    int coef_table;           ///< table index of Rice code parameters
166
    int long_term_prediction; ///< long term prediction (LTP): 1 = on, 0 = off
167
    int max_order;            ///< maximum prediction order (0..1023)
168
    int block_switching;      ///< number of block switching levels
169
    int bgmc;                 ///< "Block Gilbert-Moore Code": 1 = on, 0 = off (Rice coding only)
170
    int sb_part;              ///< sub-block partition
171
    int joint_stereo;         ///< joint stereo: 1 = on, 0 = off
172
    int mc_coding;            ///< extended inter-channel coding (multi channel coding): 1 = on, 0 = off
173
    int chan_config;          ///< indicates that a chan_config_info field is present
174
    int chan_sort;            ///< channel rearrangement: 1 = on, 0 = off
175
    int rlslms;               ///< use "Recursive Least Square-Least Mean Square" predictor: 1 = on, 0 = off
176
    int chan_config_info;     ///< mapping of channels to loudspeaker locations. Unused until setting channel configuration is implemented.
177
    int *chan_pos;            ///< original channel positions
178 cbb39648 Thilo Borgmann
    int crc_enabled;          ///< enable Cyclic Redundancy Checksum
179 99971952 Thilo Borgmann
} ALSSpecificConfig;
180
181
182
typedef struct {
183 e38215f2 Thilo Borgmann
    int stop_flag;
184
    int master_channel;
185
    int time_diff_flag;
186
    int time_diff_sign;
187
    int time_diff_index;
188
    int weighting[6];
189
} ALSChannelData;
190
191
192
typedef struct {
193 99971952 Thilo Borgmann
    AVCodecContext *avctx;
194
    ALSSpecificConfig sconf;
195
    GetBitContext gb;
196 cbb39648 Thilo Borgmann
    DSPContext dsp;
197
    const AVCRC *crc_table;
198
    uint32_t crc_org;               ///< CRC value of the original input data
199
    uint32_t crc;                   ///< CRC value calculated from decoded data
200 99971952 Thilo Borgmann
    unsigned int cur_frame_length;  ///< length of the current frame to decode
201
    unsigned int frame_id;          ///< the frame ID / number of the current frame
202
    unsigned int js_switch;         ///< if true, joint-stereo decoding is enforced
203
    unsigned int num_blocks;        ///< number of blocks used in the current frame
204 11431599 Thilo Borgmann
    unsigned int s_max;             ///< maximum Rice parameter allowed in entropy coding
205 25608328 Thilo Borgmann
    uint8_t *bgmc_lut;              ///< pointer at lookup tables used for BGMC
206 a29039ae Thilo Borgmann
    int *bgmc_lut_status;           ///< pointer at lookup table status flags used for BGMC
207 93d38cf6 Thilo Borgmann
    int ltp_lag_length;             ///< number of bits used for ltp lag value
208 efd63823 Sprezz
    int *const_block;               ///< contains const_block flags for all channels
209
    unsigned int *shift_lsbs;       ///< contains shift_lsbs flags for all channels
210
    unsigned int *opt_order;        ///< contains opt_order flags for all channels
211
    int *store_prev_samples;        ///< contains store_prev_samples flags for all channels
212 1261b07f Thilo Borgmann
    int *use_ltp;                   ///< contains use_ltp flags for all channels
213
    int *ltp_lag;                   ///< contains ltp lag values for all channels
214
    int **ltp_gain;                 ///< gain values for ltp 5-tap filter for a channel
215
    int *ltp_gain_buffer;           ///< contains all gain values for ltp 5-tap filter
216 e38215f2 Thilo Borgmann
    int32_t **quant_cof;            ///< quantized parcor coefficients for a channel
217
    int32_t *quant_cof_buffer;      ///< contains all quantized parcor coefficients
218
    int32_t **lpc_cof;              ///< coefficients of the direct form prediction filter for a channel
219
    int32_t *lpc_cof_buffer;        ///< contains all coefficients of the direct form prediction filter
220 ff9ea0b7 Thilo Borgmann
    int32_t *lpc_cof_reversed_buffer; ///< temporary buffer to set up a reversed versio of lpc_cof_buffer
221 e38215f2 Thilo Borgmann
    ALSChannelData **chan_data;     ///< channel data for multi-channel correlation
222
    ALSChannelData *chan_data_buffer; ///< contains channel data for all channels
223
    int *reverted_channels;         ///< stores a flag for each reverted channel
224 99971952 Thilo Borgmann
    int32_t *prev_raw_samples;      ///< contains unshifted raw samples from the previous block
225
    int32_t **raw_samples;          ///< decoded raw samples for each channel
226
    int32_t *raw_buffer;            ///< contains all decoded raw samples including carryover samples
227 cbb39648 Thilo Borgmann
    uint8_t *crc_buffer;            ///< buffer of byte order corrected samples used for CRC check
228 99971952 Thilo Borgmann
} ALSDecContext;
229
230
231 1261b07f Thilo Borgmann
typedef struct {
232
    unsigned int block_length;      ///< number of samples within the block
233
    unsigned int ra_block;          ///< if true, this is a random access block
234 efd63823 Sprezz
    int          *const_block;      ///< if true, this is a constant value block
235 1261b07f Thilo Borgmann
    int          js_blocks;         ///< true if this block contains a difference signal
236 efd63823 Sprezz
    unsigned int *shift_lsbs;       ///< shift of values for this block
237
    unsigned int *opt_order;        ///< prediction order of this block
238
    int          *store_prev_samples;///< if true, carryover samples have to be stored
239 1261b07f Thilo Borgmann
    int          *use_ltp;          ///< if true, long-term prediction is used
240
    int          *ltp_lag;          ///< lag value for long-term prediction
241
    int          *ltp_gain;         ///< gain values for ltp 5-tap filter
242
    int32_t      *quant_cof;        ///< quantized parcor coefficients
243
    int32_t      *lpc_cof;          ///< coefficients of the direct form prediction
244
    int32_t      *raw_samples;      ///< decoded raw samples / residuals for this block
245
    int32_t      *prev_raw_samples; ///< contains unshifted raw samples from the previous block
246
    int32_t      *raw_other;        ///< decoded raw samples of the other channel of a channel pair
247
} ALSBlockData;
248
249
250 99971952 Thilo Borgmann
static av_cold void dprint_specific_config(ALSDecContext *ctx)
251
{
252
#ifdef DEBUG
253
    AVCodecContext *avctx    = ctx->avctx;
254
    ALSSpecificConfig *sconf = &ctx->sconf;
255
256 dfd2a005 Luca Barbato
    av_dlog(avctx, "resolution = %i\n",           sconf->resolution);
257
    av_dlog(avctx, "floating = %i\n",             sconf->floating);
258
    av_dlog(avctx, "frame_length = %i\n",         sconf->frame_length);
259
    av_dlog(avctx, "ra_distance = %i\n",          sconf->ra_distance);
260
    av_dlog(avctx, "ra_flag = %i\n",              sconf->ra_flag);
261
    av_dlog(avctx, "adapt_order = %i\n",          sconf->adapt_order);
262
    av_dlog(avctx, "coef_table = %i\n",           sconf->coef_table);
263
    av_dlog(avctx, "long_term_prediction = %i\n", sconf->long_term_prediction);
264
    av_dlog(avctx, "max_order = %i\n",            sconf->max_order);
265
    av_dlog(avctx, "block_switching = %i\n",      sconf->block_switching);
266
    av_dlog(avctx, "bgmc = %i\n",                 sconf->bgmc);
267
    av_dlog(avctx, "sb_part = %i\n",              sconf->sb_part);
268
    av_dlog(avctx, "joint_stereo = %i\n",         sconf->joint_stereo);
269
    av_dlog(avctx, "mc_coding = %i\n",            sconf->mc_coding);
270
    av_dlog(avctx, "chan_config = %i\n",          sconf->chan_config);
271
    av_dlog(avctx, "chan_sort = %i\n",            sconf->chan_sort);
272
    av_dlog(avctx, "RLSLMS = %i\n",               sconf->rlslms);
273
    av_dlog(avctx, "chan_config_info = %i\n",     sconf->chan_config_info);
274 99971952 Thilo Borgmann
#endif
275
}
276
277
278 49bd8e4b Måns Rullgård
/** Read an ALSSpecificConfig from a buffer into the output struct.
279 99971952 Thilo Borgmann
 */
280
static av_cold int read_specific_config(ALSDecContext *ctx)
281
{
282
    GetBitContext gb;
283
    uint64_t ht_size;
284 cbb39648 Thilo Borgmann
    int i, config_offset;
285 99971952 Thilo Borgmann
    MPEG4AudioConfig m4ac;
286
    ALSSpecificConfig *sconf = &ctx->sconf;
287
    AVCodecContext *avctx    = ctx->avctx;
288 8e14fbe8 Thilo Borgmann
    uint32_t als_id, header_size, trailer_size;
289 99971952 Thilo Borgmann
290
    init_get_bits(&gb, avctx->extradata, avctx->extradata_size * 8);
291
292
    config_offset = ff_mpeg4audio_get_config(&m4ac, avctx->extradata,
293
                                             avctx->extradata_size);
294
295
    if (config_offset < 0)
296
        return -1;
297
298
    skip_bits_long(&gb, config_offset);
299
300
    if (get_bits_left(&gb) < (30 << 3))
301
        return -1;
302
303
    // read the fixed items
304
    als_id                      = get_bits_long(&gb, 32);
305
    avctx->sample_rate          = m4ac.sample_rate;
306
    skip_bits_long(&gb, 32); // sample rate already known
307
    sconf->samples              = get_bits_long(&gb, 32);
308
    avctx->channels             = m4ac.channels;
309
    skip_bits(&gb, 16);      // number of channels already knwon
310
    skip_bits(&gb, 3);       // skip file_type
311
    sconf->resolution           = get_bits(&gb, 3);
312
    sconf->floating             = get_bits1(&gb);
313 cbb39648 Thilo Borgmann
    sconf->msb_first            = get_bits1(&gb);
314 99971952 Thilo Borgmann
    sconf->frame_length         = get_bits(&gb, 16) + 1;
315
    sconf->ra_distance          = get_bits(&gb, 8);
316
    sconf->ra_flag              = get_bits(&gb, 2);
317
    sconf->adapt_order          = get_bits1(&gb);
318
    sconf->coef_table           = get_bits(&gb, 2);
319
    sconf->long_term_prediction = get_bits1(&gb);
320
    sconf->max_order            = get_bits(&gb, 10);
321
    sconf->block_switching      = get_bits(&gb, 2);
322
    sconf->bgmc                 = get_bits1(&gb);
323
    sconf->sb_part              = get_bits1(&gb);
324
    sconf->joint_stereo         = get_bits1(&gb);
325
    sconf->mc_coding            = get_bits1(&gb);
326
    sconf->chan_config          = get_bits1(&gb);
327
    sconf->chan_sort            = get_bits1(&gb);
328 cbb39648 Thilo Borgmann
    sconf->crc_enabled          = get_bits1(&gb);
329 99971952 Thilo Borgmann
    sconf->rlslms               = get_bits1(&gb);
330
    skip_bits(&gb, 5);       // skip 5 reserved bits
331
    skip_bits1(&gb);         // skip aux_data_enabled
332
333
334
    // check for ALSSpecificConfig struct
335
    if (als_id != MKBETAG('A','L','S','\0'))
336
        return -1;
337
338
    ctx->cur_frame_length = sconf->frame_length;
339
340
    // read channel config
341
    if (sconf->chan_config)
342
        sconf->chan_config_info = get_bits(&gb, 16);
343
    // TODO: use this to set avctx->channel_layout
344
345
346
    // read channel sorting
347
    if (sconf->chan_sort && avctx->channels > 1) {
348
        int chan_pos_bits = av_ceil_log2(avctx->channels);
349
        int bits_needed  = avctx->channels * chan_pos_bits + 7;
350
        if (get_bits_left(&gb) < bits_needed)
351
            return -1;
352
353
        if (!(sconf->chan_pos = av_malloc(avctx->channels * sizeof(*sconf->chan_pos))))
354
            return AVERROR(ENOMEM);
355
356
        for (i = 0; i < avctx->channels; i++)
357
            sconf->chan_pos[i] = get_bits(&gb, chan_pos_bits);
358
359
        align_get_bits(&gb);
360
        // TODO: use this to actually do channel sorting
361
    } else {
362
        sconf->chan_sort = 0;
363
    }
364
365
366
    // read fixed header and trailer sizes,
367
    // if size = 0xFFFFFFFF then there is no data field!
368
    if (get_bits_left(&gb) < 64)
369
        return -1;
370
371 8e14fbe8 Thilo Borgmann
    header_size  = get_bits_long(&gb, 32);
372
    trailer_size = get_bits_long(&gb, 32);
373
    if (header_size  == 0xFFFFFFFF)
374
        header_size  = 0;
375
    if (trailer_size == 0xFFFFFFFF)
376
        trailer_size = 0;
377 99971952 Thilo Borgmann
378 8e14fbe8 Thilo Borgmann
    ht_size = ((int64_t)(header_size) + (int64_t)(trailer_size)) << 3;
379 99971952 Thilo Borgmann
380
381
    // skip the header and trailer data
382
    if (get_bits_left(&gb) < ht_size)
383
        return -1;
384
385
    if (ht_size > INT32_MAX)
386
        return -1;
387
388
    skip_bits_long(&gb, ht_size);
389
390
391 cbb39648 Thilo Borgmann
    // initialize CRC calculation
392
    if (sconf->crc_enabled) {
393 99971952 Thilo Borgmann
        if (get_bits_left(&gb) < 32)
394
            return -1;
395
396 cbb39648 Thilo Borgmann
        if (avctx->error_recognition >= FF_ER_CAREFUL) {
397
            ctx->crc_table = av_crc_get_table(AV_CRC_32_IEEE_LE);
398
            ctx->crc       = 0xFFFFFFFF;
399
            ctx->crc_org   = ~get_bits_long(&gb, 32);
400
        } else
401
            skip_bits_long(&gb, 32);
402 99971952 Thilo Borgmann
    }
403
404
405
    // no need to read the rest of ALSSpecificConfig (ra_unit_size & aux data)
406
407
    dprint_specific_config(ctx);
408
409
    return 0;
410
}
411
412
413 49bd8e4b Måns Rullgård
/** Check the ALSSpecificConfig for unsupported features.
414 99971952 Thilo Borgmann
 */
415
static int check_specific_config(ALSDecContext *ctx)
416
{
417
    ALSSpecificConfig *sconf = &ctx->sconf;
418
    int error = 0;
419
420
    // report unsupported feature and set error value
421
    #define MISSING_ERR(cond, str, errval)              \
422
    {                                                   \
423
        if (cond) {                                     \
424
            av_log_missing_feature(ctx->avctx, str, 0); \
425
            error = errval;                             \
426
        }                                               \
427
    }
428
429
    MISSING_ERR(sconf->floating,             "Floating point decoding",     -1);
430
    MISSING_ERR(sconf->rlslms,               "Adaptive RLS-LMS prediction", -1);
431
    MISSING_ERR(sconf->chan_sort,            "Channel sorting",              0);
432
433
    return error;
434
}
435
436
437 49bd8e4b Måns Rullgård
/** Parse the bs_info field to extract the block partitioning used in
438 99971952 Thilo Borgmann
 *  block switching mode, refer to ISO/IEC 14496-3, section 11.6.2.
439
 */
440
static void parse_bs_info(const uint32_t bs_info, unsigned int n,
441
                          unsigned int div, unsigned int **div_blocks,
442
                          unsigned int *num_blocks)
443
{
444
    if (n < 31 && ((bs_info << n) & 0x40000000)) {
445
        // if the level is valid and the investigated bit n is set
446
        // then recursively check both children at bits (2n+1) and (2n+2)
447
        n   *= 2;
448
        div += 1;
449
        parse_bs_info(bs_info, n + 1, div, div_blocks, num_blocks);
450
        parse_bs_info(bs_info, n + 2, div, div_blocks, num_blocks);
451
    } else {
452
        // else the bit is not set or the last level has been reached
453
        // (bit implicitly not set)
454
        **div_blocks = div;
455
        (*div_blocks)++;
456
        (*num_blocks)++;
457
    }
458
}
459
460
461 48966b02 Måns Rullgård
/** Read and decode a Rice codeword.
462 99971952 Thilo Borgmann
 */
463
static int32_t decode_rice(GetBitContext *gb, unsigned int k)
464
{
465 6e44ba15 Ronald S. Bultje
    int max = get_bits_left(gb) - k;
466 99971952 Thilo Borgmann
    int q   = get_unary(gb, 0, max);
467
    int r   = k ? get_bits1(gb) : !(q & 1);
468
469
    if (k > 1) {
470
        q <<= (k - 1);
471
        q  += get_bits_long(gb, k - 1);
472
    } else if (!k) {
473
        q >>= 1;
474
    }
475
    return r ? q : ~q;
476
}
477
478
479 49bd8e4b Måns Rullgård
/** Convert PARCOR coefficient k to direct filter coefficient.
480 99971952 Thilo Borgmann
 */
481
static void parcor_to_lpc(unsigned int k, const int32_t *par, int32_t *cof)
482
{
483
    int i, j;
484
485
    for (i = 0, j = k - 1; i < j; i++, j--) {
486
        int tmp1 = ((MUL64(par[k], cof[j]) + (1 << 19)) >> 20);
487
        cof[j]  += ((MUL64(par[k], cof[i]) + (1 << 19)) >> 20);
488
        cof[i]  += tmp1;
489
    }
490
    if (i == j)
491
        cof[i] += ((MUL64(par[k], cof[j]) + (1 << 19)) >> 20);
492
493
    cof[k] = par[k];
494
}
495
496
497 48966b02 Måns Rullgård
/** Read block switching field if necessary and set actual block sizes.
498
 *  Also assure that the block sizes of the last frame correspond to the
499 99971952 Thilo Borgmann
 *  actual number of samples.
500
 */
501
static void get_block_sizes(ALSDecContext *ctx, unsigned int *div_blocks,
502
                            uint32_t *bs_info)
503
{
504
    ALSSpecificConfig *sconf     = &ctx->sconf;
505
    GetBitContext *gb            = &ctx->gb;
506
    unsigned int *ptr_div_blocks = div_blocks;
507
    unsigned int b;
508
509
    if (sconf->block_switching) {
510
        unsigned int bs_info_len = 1 << (sconf->block_switching + 2);
511
        *bs_info = get_bits_long(gb, bs_info_len);
512
        *bs_info <<= (32 - bs_info_len);
513
    }
514
515
    ctx->num_blocks = 0;
516
    parse_bs_info(*bs_info, 0, 0, &ptr_div_blocks, &ctx->num_blocks);
517
518
    // The last frame may have an overdetermined block structure given in
519
    // the bitstream. In that case the defined block structure would need
520
    // more samples than available to be consistent.
521
    // The block structure is actually used but the block sizes are adapted
522
    // to fit the actual number of available samples.
523
    // Example: 5 samples, 2nd level block sizes: 2 2 2 2.
524
    // This results in the actual block sizes:    2 2 1 0.
525
    // This is not specified in 14496-3 but actually done by the reference
526
    // codec RM22 revision 2.
527
    // This appears to happen in case of an odd number of samples in the last
528
    // frame which is actually not allowed by the block length switching part
529
    // of 14496-3.
530
    // The ALS conformance files feature an odd number of samples in the last
531
    // frame.
532
533
    for (b = 0; b < ctx->num_blocks; b++)
534
        div_blocks[b] = ctx->sconf.frame_length >> div_blocks[b];
535
536
    if (ctx->cur_frame_length != ctx->sconf.frame_length) {
537
        unsigned int remaining = ctx->cur_frame_length;
538
539
        for (b = 0; b < ctx->num_blocks; b++) {
540 bbe8fa1f Thilo Borgmann
            if (remaining <= div_blocks[b]) {
541 99971952 Thilo Borgmann
                div_blocks[b] = remaining;
542
                ctx->num_blocks = b + 1;
543
                break;
544
            }
545
546
            remaining -= div_blocks[b];
547
        }
548
    }
549
}
550
551
552 49bd8e4b Måns Rullgård
/** Read the block data for a constant block
553 99971952 Thilo Borgmann
 */
554 1261b07f Thilo Borgmann
static void read_const_block_data(ALSDecContext *ctx, ALSBlockData *bd)
555 99971952 Thilo Borgmann
{
556
    ALSSpecificConfig *sconf = &ctx->sconf;
557
    AVCodecContext *avctx    = ctx->avctx;
558
    GetBitContext *gb        = &ctx->gb;
559
560 efd63823 Sprezz
    *bd->raw_samples = 0;
561
    *bd->const_block = get_bits1(gb);    // 1 = constant value, 0 = zero block (silence)
562 1261b07f Thilo Borgmann
    bd->js_blocks    = get_bits1(gb);
563 99971952 Thilo Borgmann
564
    // skip 5 reserved bits
565
    skip_bits(gb, 5);
566
567 efd63823 Sprezz
    if (*bd->const_block) {
568 99971952 Thilo Borgmann
        unsigned int const_val_bits = sconf->floating ? 24 : avctx->bits_per_raw_sample;
569 efd63823 Sprezz
        *bd->raw_samples = get_sbits_long(gb, const_val_bits);
570 99971952 Thilo Borgmann
    }
571
572 1261b07f Thilo Borgmann
    // ensure constant block decoding by reusing this field
573 efd63823 Sprezz
    *bd->const_block = 1;
574 1261b07f Thilo Borgmann
}
575
576
577 49bd8e4b Måns Rullgård
/** Decode the block data for a constant block
578 1261b07f Thilo Borgmann
 */
579
static void decode_const_block_data(ALSDecContext *ctx, ALSBlockData *bd)
580
{
581 efd63823 Sprezz
    int      smp = bd->block_length - 1;
582
    int32_t  val = *bd->raw_samples;
583
    int32_t *dst = bd->raw_samples + 1;
584 1261b07f Thilo Borgmann
585 99971952 Thilo Borgmann
    // write raw samples into buffer
586 1261b07f Thilo Borgmann
    for (; smp; smp--)
587
        *dst++ = val;
588 99971952 Thilo Borgmann
}
589
590
591 49bd8e4b Måns Rullgård
/** Read the block data for a non-constant block
592 99971952 Thilo Borgmann
 */
593 1261b07f Thilo Borgmann
static int read_var_block_data(ALSDecContext *ctx, ALSBlockData *bd)
594 99971952 Thilo Borgmann
{
595
    ALSSpecificConfig *sconf = &ctx->sconf;
596
    AVCodecContext *avctx    = ctx->avctx;
597
    GetBitContext *gb        = &ctx->gb;
598
    unsigned int k;
599
    unsigned int s[8];
600 25608328 Thilo Borgmann
    unsigned int sx[8];
601 99971952 Thilo Borgmann
    unsigned int sub_blocks, log2_sub_blocks, sb_length;
602
    unsigned int start      = 0;
603 1261b07f Thilo Borgmann
    unsigned int opt_order;
604
    int          sb;
605
    int32_t      *quant_cof = bd->quant_cof;
606 25608328 Thilo Borgmann
    int32_t      *current_res;
607 99971952 Thilo Borgmann
608 1261b07f Thilo Borgmann
609
    // ensure variable block decoding by reusing this field
610 efd63823 Sprezz
    *bd->const_block = 0;
611 1261b07f Thilo Borgmann
612 efd63823 Sprezz
    *bd->opt_order  = 1;
613 1261b07f Thilo Borgmann
    bd->js_blocks   = get_bits1(gb);
614
615 efd63823 Sprezz
    opt_order       = *bd->opt_order;
616 99971952 Thilo Borgmann
617
    // determine the number of subblocks for entropy decoding
618
    if (!sconf->bgmc && !sconf->sb_part) {
619
        log2_sub_blocks = 0;
620
    } else {
621
        if (sconf->bgmc && sconf->sb_part)
622
            log2_sub_blocks = get_bits(gb, 2);
623
        else
624
            log2_sub_blocks = 2 * get_bits1(gb);
625
    }
626
627
    sub_blocks = 1 << log2_sub_blocks;
628
629
    // do not continue in case of a damaged stream since
630
    // block_length must be evenly divisible by sub_blocks
631 1261b07f Thilo Borgmann
    if (bd->block_length & (sub_blocks - 1)) {
632 99971952 Thilo Borgmann
        av_log(avctx, AV_LOG_WARNING,
633
               "Block length is not evenly divisible by the number of subblocks.\n");
634
        return -1;
635
    }
636
637 1261b07f Thilo Borgmann
    sb_length = bd->block_length >> log2_sub_blocks;
638 99971952 Thilo Borgmann
639
    if (sconf->bgmc) {
640 25608328 Thilo Borgmann
        s[0] = get_bits(gb, 8 + (sconf->resolution > 1));
641
        for (k = 1; k < sub_blocks; k++)
642
            s[k] = s[k - 1] + decode_rice(gb, 2);
643
644
        for (k = 0; k < sub_blocks; k++) {
645
            sx[k]   = s[k] & 0x0F;
646
            s [k] >>= 4;
647
        }
648 99971952 Thilo Borgmann
    } else {
649
        s[0] = get_bits(gb, 4 + (sconf->resolution > 1));
650
        for (k = 1; k < sub_blocks; k++)
651
            s[k] = s[k - 1] + decode_rice(gb, 0);
652
    }
653
654
    if (get_bits1(gb))
655 efd63823 Sprezz
        *bd->shift_lsbs = get_bits(gb, 4) + 1;
656 99971952 Thilo Borgmann
657 efd63823 Sprezz
    *bd->store_prev_samples = (bd->js_blocks && bd->raw_other) || *bd->shift_lsbs;
658 99971952 Thilo Borgmann
659
660
    if (!sconf->rlslms) {
661
        if (sconf->adapt_order) {
662 1261b07f Thilo Borgmann
            int opt_order_length = av_ceil_log2(av_clip((bd->block_length >> 3) - 1,
663 99971952 Thilo Borgmann
                                                2, sconf->max_order + 1));
664 efd63823 Sprezz
            *bd->opt_order       = get_bits(gb, opt_order_length);
665 99971952 Thilo Borgmann
        } else {
666 efd63823 Sprezz
            *bd->opt_order = sconf->max_order;
667 99971952 Thilo Borgmann
        }
668
669 efd63823 Sprezz
        opt_order = *bd->opt_order;
670 1261b07f Thilo Borgmann
671 99971952 Thilo Borgmann
        if (opt_order) {
672
            int add_base;
673
674
            if (sconf->coef_table == 3) {
675
                add_base = 0x7F;
676
677
                // read coefficient 0
678
                quant_cof[0] = 32 * parcor_scaled_values[get_bits(gb, 7)];
679
680
                // read coefficient 1
681
                if (opt_order > 1)
682
                    quant_cof[1] = -32 * parcor_scaled_values[get_bits(gb, 7)];
683
684
                // read coefficients 2 to opt_order
685
                for (k = 2; k < opt_order; k++)
686
                    quant_cof[k] = get_bits(gb, 7);
687
            } else {
688
                int k_max;
689
                add_base = 1;
690
691
                // read coefficient 0 to 19
692
                k_max = FFMIN(opt_order, 20);
693
                for (k = 0; k < k_max; k++) {
694
                    int rice_param = parcor_rice_table[sconf->coef_table][k][1];
695
                    int offset     = parcor_rice_table[sconf->coef_table][k][0];
696
                    quant_cof[k] = decode_rice(gb, rice_param) + offset;
697
                }
698
699
                // read coefficients 20 to 126
700
                k_max = FFMIN(opt_order, 127);
701
                for (; k < k_max; k++)
702
                    quant_cof[k] = decode_rice(gb, 2) + (k & 1);
703
704
                // read coefficients 127 to opt_order
705
                for (; k < opt_order; k++)
706
                    quant_cof[k] = decode_rice(gb, 1);
707
708
                quant_cof[0] = 32 * parcor_scaled_values[quant_cof[0] + 64];
709
710
                if (opt_order > 1)
711
                    quant_cof[1] = -32 * parcor_scaled_values[quant_cof[1] + 64];
712
            }
713
714
            for (k = 2; k < opt_order; k++)
715
                quant_cof[k] = (quant_cof[k] << 14) + (add_base << 13);
716
        }
717
    }
718
719 93d38cf6 Thilo Borgmann
    // read LTP gain and lag values
720
    if (sconf->long_term_prediction) {
721 1261b07f Thilo Borgmann
        *bd->use_ltp = get_bits1(gb);
722 93d38cf6 Thilo Borgmann
723 1261b07f Thilo Borgmann
        if (*bd->use_ltp) {
724 a8c09ff2 Thilo Borgmann
            int r, c;
725
726 1261b07f Thilo Borgmann
            bd->ltp_gain[0]   = decode_rice(gb, 1) << 3;
727
            bd->ltp_gain[1]   = decode_rice(gb, 2) << 3;
728 93d38cf6 Thilo Borgmann
729 a8c09ff2 Thilo Borgmann
            r                 = get_unary(gb, 0, 4);
730
            c                 = get_bits(gb, 2);
731
            bd->ltp_gain[2]   = ltp_gain_values[r][c];
732 93d38cf6 Thilo Borgmann
733 1261b07f Thilo Borgmann
            bd->ltp_gain[3]   = decode_rice(gb, 2) << 3;
734
            bd->ltp_gain[4]   = decode_rice(gb, 1) << 3;
735 93d38cf6 Thilo Borgmann
736 1261b07f Thilo Borgmann
            *bd->ltp_lag      = get_bits(gb, ctx->ltp_lag_length);
737
            *bd->ltp_lag     += FFMAX(4, opt_order + 1);
738 93d38cf6 Thilo Borgmann
        }
739
    }
740 99971952 Thilo Borgmann
741
    // read first value and residuals in case of a random access block
742 1261b07f Thilo Borgmann
    if (bd->ra_block) {
743 99971952 Thilo Borgmann
        if (opt_order)
744 1261b07f Thilo Borgmann
            bd->raw_samples[0] = decode_rice(gb, avctx->bits_per_raw_sample - 4);
745 99971952 Thilo Borgmann
        if (opt_order > 1)
746 11431599 Thilo Borgmann
            bd->raw_samples[1] = decode_rice(gb, FFMIN(s[0] + 3, ctx->s_max));
747 99971952 Thilo Borgmann
        if (opt_order > 2)
748 11431599 Thilo Borgmann
            bd->raw_samples[2] = decode_rice(gb, FFMIN(s[0] + 1, ctx->s_max));
749 99971952 Thilo Borgmann
750
        start = FFMIN(opt_order, 3);
751
    }
752
753
    // read all residuals
754
    if (sconf->bgmc) {
755 a29039ae Thilo Borgmann
        int          delta[8];
756 17253f59 Måns Rullgård
        unsigned int k    [8];
757 25608328 Thilo Borgmann
        unsigned int b = av_clip((av_ceil_log2(bd->block_length) - 3) >> 1, 0, 5);
758
        unsigned int i = start;
759
760
        // read most significant bits
761
        unsigned int high;
762
        unsigned int low;
763
        unsigned int value;
764
765
        ff_bgmc_decode_init(gb, &high, &low, &value);
766
767
        current_res = bd->raw_samples + start;
768
769
        for (sb = 0; sb < sub_blocks; sb++, i = 0) {
770
            k    [sb] = s[sb] > b ? s[sb] - b : 0;
771
            delta[sb] = 5 - s[sb] + k[sb];
772
773
            ff_bgmc_decode(gb, sb_length, current_res,
774
                        delta[sb], sx[sb], &high, &low, &value, ctx->bgmc_lut, ctx->bgmc_lut_status);
775
776
            current_res += sb_length;
777
        }
778
779
        ff_bgmc_decode_end(gb);
780
781
782
        // read least significant bits and tails
783
        i = start;
784
        current_res = bd->raw_samples + start;
785
786
        for (sb = 0; sb < sub_blocks; sb++, i = 0) {
787
            unsigned int cur_tail_code = tail_code[sx[sb]][delta[sb]];
788
            unsigned int cur_k         = k[sb];
789
            unsigned int cur_s         = s[sb];
790
791
            for (; i < sb_length; i++) {
792
                int32_t res = *current_res;
793
794
                if (res == cur_tail_code) {
795
                    unsigned int max_msb =   (2 + (sx[sb] > 2) + (sx[sb] > 10))
796
                                          << (5 - delta[sb]);
797
798
                    res = decode_rice(gb, cur_s);
799
800
                    if (res >= 0) {
801
                        res += (max_msb    ) << cur_k;
802
                    } else {
803
                        res -= (max_msb - 1) << cur_k;
804
                    }
805
                } else {
806
                    if (res > cur_tail_code)
807
                        res--;
808
809
                    if (res & 1)
810
                        res = -res;
811
812
                    res >>= 1;
813
814
                    if (cur_k) {
815
                        res <<= cur_k;
816
                        res  |= get_bits_long(gb, cur_k);
817
                    }
818
                }
819
820 65760304 Thilo Borgmann
                *current_res++ = res;
821 25608328 Thilo Borgmann
            }
822
        }
823 99971952 Thilo Borgmann
    } else {
824 25608328 Thilo Borgmann
        current_res = bd->raw_samples + start;
825 99971952 Thilo Borgmann
826
        for (sb = 0; sb < sub_blocks; sb++, start = 0)
827
            for (; start < sb_length; start++)
828
                *current_res++ = decode_rice(gb, s[sb]);
829
     }
830
831 1261b07f Thilo Borgmann
    if (!sconf->mc_coding || ctx->js_switch)
832
        align_get_bits(gb);
833
834
    return 0;
835
}
836
837
838 49bd8e4b Måns Rullgård
/** Decode the block data for a non-constant block
839 1261b07f Thilo Borgmann
 */
840
static int decode_var_block_data(ALSDecContext *ctx, ALSBlockData *bd)
841
{
842
    ALSSpecificConfig *sconf = &ctx->sconf;
843
    unsigned int block_length = bd->block_length;
844
    unsigned int smp = 0;
845
    unsigned int k;
846 efd63823 Sprezz
    int opt_order             = *bd->opt_order;
847 1261b07f Thilo Borgmann
    int sb;
848
    int64_t y;
849
    int32_t *quant_cof        = bd->quant_cof;
850
    int32_t *lpc_cof          = bd->lpc_cof;
851
    int32_t *raw_samples      = bd->raw_samples;
852 99c5f5cc Thilo Borgmann
    int32_t *raw_samples_end  = bd->raw_samples + bd->block_length;
853 ff9ea0b7 Thilo Borgmann
    int32_t *lpc_cof_reversed = ctx->lpc_cof_reversed_buffer;
854 1261b07f Thilo Borgmann
855 93d38cf6 Thilo Borgmann
    // reverse long-term prediction
856 1261b07f Thilo Borgmann
    if (*bd->use_ltp) {
857 93d38cf6 Thilo Borgmann
        int ltp_smp;
858
859 1261b07f Thilo Borgmann
        for (ltp_smp = FFMAX(*bd->ltp_lag - 2, 0); ltp_smp < block_length; ltp_smp++) {
860
            int center = ltp_smp - *bd->ltp_lag;
861 93d38cf6 Thilo Borgmann
            int begin  = FFMAX(0, center - 2);
862
            int end    = center + 3;
863
            int tab    = 5 - (end - begin);
864
            int base;
865
866
            y = 1 << 6;
867
868
            for (base = begin; base < end; base++, tab++)
869 1261b07f Thilo Borgmann
                y += MUL64(bd->ltp_gain[tab], raw_samples[base]);
870 93d38cf6 Thilo Borgmann
871
            raw_samples[ltp_smp] += y >> 7;
872
        }
873
    }
874
875 99971952 Thilo Borgmann
    // reconstruct all samples from residuals
876 1261b07f Thilo Borgmann
    if (bd->ra_block) {
877 99971952 Thilo Borgmann
        for (smp = 0; smp < opt_order; smp++) {
878
            y = 1 << 19;
879
880
            for (sb = 0; sb < smp; sb++)
881 99c5f5cc Thilo Borgmann
                y += MUL64(lpc_cof[sb], raw_samples[-(sb + 1)]);
882 99971952 Thilo Borgmann
883 99c5f5cc Thilo Borgmann
            *raw_samples++ -= y >> 20;
884 99971952 Thilo Borgmann
            parcor_to_lpc(smp, quant_cof, lpc_cof);
885
        }
886
    } else {
887
        for (k = 0; k < opt_order; k++)
888
            parcor_to_lpc(k, quant_cof, lpc_cof);
889
890
        // store previous samples in case that they have to be altered
891 efd63823 Sprezz
        if (*bd->store_prev_samples)
892 1261b07f Thilo Borgmann
            memcpy(bd->prev_raw_samples, raw_samples - sconf->max_order,
893
                   sizeof(*bd->prev_raw_samples) * sconf->max_order);
894 99971952 Thilo Borgmann
895
        // reconstruct difference signal for prediction (joint-stereo)
896 1261b07f Thilo Borgmann
        if (bd->js_blocks && bd->raw_other) {
897 99971952 Thilo Borgmann
            int32_t *left, *right;
898
899 1261b07f Thilo Borgmann
            if (bd->raw_other > raw_samples) {  // D = R - L
900 99971952 Thilo Borgmann
                left  = raw_samples;
901 1261b07f Thilo Borgmann
                right = bd->raw_other;
902 99971952 Thilo Borgmann
            } else {                                // D = R - L
903 1261b07f Thilo Borgmann
                left  = bd->raw_other;
904 99971952 Thilo Borgmann
                right = raw_samples;
905
            }
906
907
            for (sb = -1; sb >= -sconf->max_order; sb--)
908
                raw_samples[sb] = right[sb] - left[sb];
909
        }
910
911
        // reconstruct shifted signal
912 efd63823 Sprezz
        if (*bd->shift_lsbs)
913 99971952 Thilo Borgmann
            for (sb = -1; sb >= -sconf->max_order; sb--)
914 efd63823 Sprezz
                raw_samples[sb] >>= *bd->shift_lsbs;
915 99971952 Thilo Borgmann
    }
916
917 99c5f5cc Thilo Borgmann
    // reverse linear prediction coefficients for efficiency
918
    lpc_cof = lpc_cof + opt_order;
919
920
    for (sb = 0; sb < opt_order; sb++)
921
        lpc_cof_reversed[sb] = lpc_cof[-(sb + 1)];
922
923 99971952 Thilo Borgmann
    // reconstruct raw samples
924 99c5f5cc Thilo Borgmann
    raw_samples = bd->raw_samples + smp;
925
    lpc_cof     = lpc_cof_reversed + opt_order;
926
927
    for (; raw_samples < raw_samples_end; raw_samples++) {
928 99971952 Thilo Borgmann
        y = 1 << 19;
929
930 99c5f5cc Thilo Borgmann
        for (sb = -opt_order; sb < 0; sb++)
931
            y += MUL64(lpc_cof[sb], raw_samples[sb]);
932 99971952 Thilo Borgmann
933 99c5f5cc Thilo Borgmann
        *raw_samples -= y >> 20;
934 99971952 Thilo Borgmann
    }
935
936 99c5f5cc Thilo Borgmann
    raw_samples = bd->raw_samples;
937
938 99971952 Thilo Borgmann
    // restore previous samples in case that they have been altered
939 efd63823 Sprezz
    if (*bd->store_prev_samples)
940 1261b07f Thilo Borgmann
        memcpy(raw_samples - sconf->max_order, bd->prev_raw_samples,
941 99971952 Thilo Borgmann
               sizeof(*raw_samples) * sconf->max_order);
942
943
    return 0;
944
}
945
946
947 49bd8e4b Måns Rullgård
/** Read the block data.
948 99971952 Thilo Borgmann
 */
949 1261b07f Thilo Borgmann
static int read_block(ALSDecContext *ctx, ALSBlockData *bd)
950 99971952 Thilo Borgmann
{
951
    GetBitContext *gb        = &ctx->gb;
952
953 efd63823 Sprezz
    *bd->shift_lsbs = 0;
954 99971952 Thilo Borgmann
    // read block type flag and read the samples accordingly
955
    if (get_bits1(gb)) {
956 1261b07f Thilo Borgmann
        if (read_var_block_data(ctx, bd))
957 99971952 Thilo Borgmann
            return -1;
958
    } else {
959 1261b07f Thilo Borgmann
        read_const_block_data(ctx, bd);
960 99971952 Thilo Borgmann
    }
961
962 1261b07f Thilo Borgmann
    return 0;
963
}
964 99971952 Thilo Borgmann
965
966 49bd8e4b Måns Rullgård
/** Decode the block data.
967 1261b07f Thilo Borgmann
 */
968
static int decode_block(ALSDecContext *ctx, ALSBlockData *bd)
969
{
970
    unsigned int smp;
971
972
    // read block type flag and read the samples accordingly
973 efd63823 Sprezz
    if (*bd->const_block)
974 1261b07f Thilo Borgmann
        decode_const_block_data(ctx, bd);
975
    else if (decode_var_block_data(ctx, bd))
976
        return -1;
977
978
    // TODO: read RLSLMS extension data
979
980 efd63823 Sprezz
    if (*bd->shift_lsbs)
981 1261b07f Thilo Borgmann
        for (smp = 0; smp < bd->block_length; smp++)
982 efd63823 Sprezz
            bd->raw_samples[smp] <<= *bd->shift_lsbs;
983 99971952 Thilo Borgmann
984
    return 0;
985
}
986
987
988 48966b02 Måns Rullgård
/** Read and decode block data successively.
989 1261b07f Thilo Borgmann
 */
990
static int read_decode_block(ALSDecContext *ctx, ALSBlockData *bd)
991
{
992
    int ret;
993
994
    ret = read_block(ctx, bd);
995
996
    if (ret)
997
        return ret;
998
999
    ret = decode_block(ctx, bd);
1000
1001
    return ret;
1002
}
1003
1004
1005 49bd8e4b Måns Rullgård
/** Compute the number of samples left to decode for the current frame and
1006 99971952 Thilo Borgmann
 *  sets these samples to zero.
1007
 */
1008
static void zero_remaining(unsigned int b, unsigned int b_max,
1009
                           const unsigned int *div_blocks, int32_t *buf)
1010
{
1011
    unsigned int count = 0;
1012
1013
    while (b < b_max)
1014
        count += div_blocks[b];
1015
1016 0bb622ba Alex Converse
    if (count)
1017 9349e558 Alex Converse
        memset(buf, 0, sizeof(*buf) * count);
1018 99971952 Thilo Borgmann
}
1019
1020
1021 49bd8e4b Måns Rullgård
/** Decode blocks independently.
1022 99971952 Thilo Borgmann
 */
1023
static int decode_blocks_ind(ALSDecContext *ctx, unsigned int ra_frame,
1024
                             unsigned int c, const unsigned int *div_blocks,
1025
                             unsigned int *js_blocks)
1026
{
1027
    unsigned int b;
1028 1261b07f Thilo Borgmann
    ALSBlockData bd;
1029
1030
    memset(&bd, 0, sizeof(ALSBlockData));
1031
1032
    bd.ra_block         = ra_frame;
1033 efd63823 Sprezz
    bd.const_block      = ctx->const_block;
1034
    bd.shift_lsbs       = ctx->shift_lsbs;
1035
    bd.opt_order        = ctx->opt_order;
1036
    bd.store_prev_samples = ctx->store_prev_samples;
1037 1261b07f Thilo Borgmann
    bd.use_ltp          = ctx->use_ltp;
1038
    bd.ltp_lag          = ctx->ltp_lag;
1039
    bd.ltp_gain         = ctx->ltp_gain[0];
1040 e38215f2 Thilo Borgmann
    bd.quant_cof        = ctx->quant_cof[0];
1041
    bd.lpc_cof          = ctx->lpc_cof[0];
1042 1261b07f Thilo Borgmann
    bd.prev_raw_samples = ctx->prev_raw_samples;
1043
    bd.raw_samples      = ctx->raw_samples[c];
1044
1045 99971952 Thilo Borgmann
1046
    for (b = 0; b < ctx->num_blocks; b++) {
1047 1261b07f Thilo Borgmann
        bd.block_length     = div_blocks[b];
1048
1049
        if (read_decode_block(ctx, &bd)) {
1050 99971952 Thilo Borgmann
            // damaged block, write zero for the rest of the frame
1051 1261b07f Thilo Borgmann
            zero_remaining(b, ctx->num_blocks, div_blocks, bd.raw_samples);
1052 99971952 Thilo Borgmann
            return -1;
1053
        }
1054 1261b07f Thilo Borgmann
        bd.raw_samples += div_blocks[b];
1055
        bd.ra_block     = 0;
1056 99971952 Thilo Borgmann
    }
1057
1058
    return 0;
1059
}
1060
1061
1062 49bd8e4b Måns Rullgård
/** Decode blocks dependently.
1063 99971952 Thilo Borgmann
 */
1064
static int decode_blocks(ALSDecContext *ctx, unsigned int ra_frame,
1065
                         unsigned int c, const unsigned int *div_blocks,
1066
                         unsigned int *js_blocks)
1067
{
1068
    ALSSpecificConfig *sconf = &ctx->sconf;
1069
    unsigned int offset = 0;
1070
    unsigned int b;
1071 1261b07f Thilo Borgmann
    ALSBlockData bd[2];
1072
1073
    memset(bd, 0, 2 * sizeof(ALSBlockData));
1074
1075
    bd[0].ra_block         = ra_frame;
1076 efd63823 Sprezz
    bd[0].const_block      = ctx->const_block;
1077
    bd[0].shift_lsbs       = ctx->shift_lsbs;
1078
    bd[0].opt_order        = ctx->opt_order;
1079
    bd[0].store_prev_samples = ctx->store_prev_samples;
1080 1261b07f Thilo Borgmann
    bd[0].use_ltp          = ctx->use_ltp;
1081
    bd[0].ltp_lag          = ctx->ltp_lag;
1082
    bd[0].ltp_gain         = ctx->ltp_gain[0];
1083 e38215f2 Thilo Borgmann
    bd[0].quant_cof        = ctx->quant_cof[0];
1084
    bd[0].lpc_cof          = ctx->lpc_cof[0];
1085 1261b07f Thilo Borgmann
    bd[0].prev_raw_samples = ctx->prev_raw_samples;
1086
    bd[0].js_blocks        = *js_blocks;
1087
1088
    bd[1].ra_block         = ra_frame;
1089 efd63823 Sprezz
    bd[1].const_block      = ctx->const_block;
1090
    bd[1].shift_lsbs       = ctx->shift_lsbs;
1091
    bd[1].opt_order        = ctx->opt_order;
1092
    bd[1].store_prev_samples = ctx->store_prev_samples;
1093 1261b07f Thilo Borgmann
    bd[1].use_ltp          = ctx->use_ltp;
1094
    bd[1].ltp_lag          = ctx->ltp_lag;
1095
    bd[1].ltp_gain         = ctx->ltp_gain[0];
1096 e38215f2 Thilo Borgmann
    bd[1].quant_cof        = ctx->quant_cof[0];
1097
    bd[1].lpc_cof          = ctx->lpc_cof[0];
1098 1261b07f Thilo Borgmann
    bd[1].prev_raw_samples = ctx->prev_raw_samples;
1099
    bd[1].js_blocks        = *(js_blocks + 1);
1100 99971952 Thilo Borgmann
1101
    // decode all blocks
1102
    for (b = 0; b < ctx->num_blocks; b++) {
1103
        unsigned int s;
1104 1261b07f Thilo Borgmann
1105
        bd[0].block_length = div_blocks[b];
1106
        bd[1].block_length = div_blocks[b];
1107
1108
        bd[0].raw_samples  = ctx->raw_samples[c    ] + offset;
1109
        bd[1].raw_samples  = ctx->raw_samples[c + 1] + offset;
1110
1111
        bd[0].raw_other    = bd[1].raw_samples;
1112
        bd[1].raw_other    = bd[0].raw_samples;
1113
1114
        if(read_decode_block(ctx, &bd[0]) || read_decode_block(ctx, &bd[1])) {
1115 99971952 Thilo Borgmann
            // damaged block, write zero for the rest of the frame
1116 1261b07f Thilo Borgmann
            zero_remaining(b, ctx->num_blocks, div_blocks, bd[0].raw_samples);
1117
            zero_remaining(b, ctx->num_blocks, div_blocks, bd[1].raw_samples);
1118 99971952 Thilo Borgmann
            return -1;
1119
        }
1120
1121
        // reconstruct joint-stereo blocks
1122 1261b07f Thilo Borgmann
        if (bd[0].js_blocks) {
1123
            if (bd[1].js_blocks)
1124 99971952 Thilo Borgmann
                av_log(ctx->avctx, AV_LOG_WARNING, "Invalid channel pair!\n");
1125
1126
            for (s = 0; s < div_blocks[b]; s++)
1127 1261b07f Thilo Borgmann
                bd[0].raw_samples[s] = bd[1].raw_samples[s] - bd[0].raw_samples[s];
1128
        } else if (bd[1].js_blocks) {
1129 99971952 Thilo Borgmann
            for (s = 0; s < div_blocks[b]; s++)
1130 1261b07f Thilo Borgmann
                bd[1].raw_samples[s] = bd[1].raw_samples[s] + bd[0].raw_samples[s];
1131 99971952 Thilo Borgmann
        }
1132
1133
        offset  += div_blocks[b];
1134 1261b07f Thilo Borgmann
        bd[0].ra_block = 0;
1135
        bd[1].ra_block = 0;
1136 99971952 Thilo Borgmann
    }
1137
1138
    // store carryover raw samples,
1139
    // the others channel raw samples are stored by the calling function.
1140
    memmove(ctx->raw_samples[c] - sconf->max_order,
1141
            ctx->raw_samples[c] - sconf->max_order + sconf->frame_length,
1142
            sizeof(*ctx->raw_samples[c]) * sconf->max_order);
1143
1144
    return 0;
1145
}
1146
1147
1148 49bd8e4b Måns Rullgård
/** Read the channel data.
1149 e38215f2 Thilo Borgmann
  */
1150
static int read_channel_data(ALSDecContext *ctx, ALSChannelData *cd, int c)
1151
{
1152
    GetBitContext *gb       = &ctx->gb;
1153
    ALSChannelData *current = cd;
1154
    unsigned int channels   = ctx->avctx->channels;
1155
    int entries             = 0;
1156
1157
    while (entries < channels && !(current->stop_flag = get_bits1(gb))) {
1158
        current->master_channel = get_bits_long(gb, av_ceil_log2(channels));
1159
1160
        if (current->master_channel >= channels) {
1161
            av_log(ctx->avctx, AV_LOG_ERROR, "Invalid master channel!\n");
1162
            return -1;
1163
        }
1164
1165
        if (current->master_channel != c) {
1166
            current->time_diff_flag = get_bits1(gb);
1167
            current->weighting[0]   = mcc_weightings[av_clip(decode_rice(gb, 1) + 16, 0, 32)];
1168
            current->weighting[1]   = mcc_weightings[av_clip(decode_rice(gb, 2) + 14, 0, 32)];
1169
            current->weighting[2]   = mcc_weightings[av_clip(decode_rice(gb, 1) + 16, 0, 32)];
1170
1171
            if (current->time_diff_flag) {
1172
                current->weighting[3] = mcc_weightings[av_clip(decode_rice(gb, 1) + 16, 0, 32)];
1173
                current->weighting[4] = mcc_weightings[av_clip(decode_rice(gb, 1) + 16, 0, 32)];
1174
                current->weighting[5] = mcc_weightings[av_clip(decode_rice(gb, 1) + 16, 0, 32)];
1175
1176
                current->time_diff_sign  = get_bits1(gb);
1177
                current->time_diff_index = get_bits(gb, ctx->ltp_lag_length - 3) + 3;
1178
            }
1179
        }
1180
1181
        current++;
1182
        entries++;
1183
    }
1184
1185
    if (entries == channels) {
1186
        av_log(ctx->avctx, AV_LOG_ERROR, "Damaged channel data!\n");
1187
        return -1;
1188
    }
1189
1190
    align_get_bits(gb);
1191
    return 0;
1192
}
1193
1194
1195
/** Recursively reverts the inter-channel correlation for a block.
1196
 */
1197
static int revert_channel_correlation(ALSDecContext *ctx, ALSBlockData *bd,
1198
                                       ALSChannelData **cd, int *reverted,
1199
                                       unsigned int offset, int c)
1200
{
1201
    ALSChannelData *ch = cd[c];
1202
    unsigned int   dep = 0;
1203
    unsigned int channels = ctx->avctx->channels;
1204
1205
    if (reverted[c])
1206
        return 0;
1207
1208
    reverted[c] = 1;
1209
1210
    while (dep < channels && !ch[dep].stop_flag) {
1211
        revert_channel_correlation(ctx, bd, cd, reverted, offset,
1212
                                   ch[dep].master_channel);
1213
1214
        dep++;
1215
    }
1216
1217
    if (dep == channels) {
1218
        av_log(ctx->avctx, AV_LOG_WARNING, "Invalid channel correlation!\n");
1219
        return -1;
1220
    }
1221
1222 efd63823 Sprezz
    bd->const_block = ctx->const_block + c;
1223
    bd->shift_lsbs  = ctx->shift_lsbs + c;
1224
    bd->opt_order   = ctx->opt_order + c;
1225
    bd->store_prev_samples = ctx->store_prev_samples + c;
1226 e38215f2 Thilo Borgmann
    bd->use_ltp     = ctx->use_ltp + c;
1227
    bd->ltp_lag     = ctx->ltp_lag + c;
1228
    bd->ltp_gain    = ctx->ltp_gain[c];
1229
    bd->lpc_cof     = ctx->lpc_cof[c];
1230
    bd->quant_cof   = ctx->quant_cof[c];
1231
    bd->raw_samples = ctx->raw_samples[c] + offset;
1232
1233
    dep = 0;
1234
    while (!ch[dep].stop_flag) {
1235
        unsigned int smp;
1236
        unsigned int begin = 1;
1237
        unsigned int end   = bd->block_length - 1;
1238
        int64_t y;
1239
        int32_t *master = ctx->raw_samples[ch[dep].master_channel] + offset;
1240
1241
        if (ch[dep].time_diff_flag) {
1242
            int t = ch[dep].time_diff_index;
1243
1244
            if (ch[dep].time_diff_sign) {
1245
                t      = -t;
1246
                begin -= t;
1247
            } else {
1248
                end   -= t;
1249
            }
1250
1251
            for (smp = begin; smp < end; smp++) {
1252
                y  = (1 << 6) +
1253
                     MUL64(ch[dep].weighting[0], master[smp - 1    ]) +
1254
                     MUL64(ch[dep].weighting[1], master[smp        ]) +
1255
                     MUL64(ch[dep].weighting[2], master[smp + 1    ]) +
1256
                     MUL64(ch[dep].weighting[3], master[smp - 1 + t]) +
1257
                     MUL64(ch[dep].weighting[4], master[smp     + t]) +
1258
                     MUL64(ch[dep].weighting[5], master[smp + 1 + t]);
1259
1260
                bd->raw_samples[smp] += y >> 7;
1261
            }
1262
        } else {
1263
            for (smp = begin; smp < end; smp++) {
1264
                y  = (1 << 6) +
1265
                     MUL64(ch[dep].weighting[0], master[smp - 1]) +
1266
                     MUL64(ch[dep].weighting[1], master[smp    ]) +
1267
                     MUL64(ch[dep].weighting[2], master[smp + 1]);
1268
1269
                bd->raw_samples[smp] += y >> 7;
1270
            }
1271
        }
1272
1273
        dep++;
1274
    }
1275
1276
    return 0;
1277
}
1278
1279
1280 49bd8e4b Måns Rullgård
/** Read the frame data.
1281 99971952 Thilo Borgmann
 */
1282
static int read_frame_data(ALSDecContext *ctx, unsigned int ra_frame)
1283
{
1284
    ALSSpecificConfig *sconf = &ctx->sconf;
1285
    AVCodecContext *avctx    = ctx->avctx;
1286
    GetBitContext *gb = &ctx->gb;
1287
    unsigned int div_blocks[32];                ///< block sizes.
1288
    unsigned int c;
1289
    unsigned int js_blocks[2];
1290
1291
    uint32_t bs_info = 0;
1292
1293
    // skip the size of the ra unit if present in the frame
1294
    if (sconf->ra_flag == RA_FLAG_FRAMES && ra_frame)
1295
        skip_bits_long(gb, 32);
1296
1297
    if (sconf->mc_coding && sconf->joint_stereo) {
1298
        ctx->js_switch = get_bits1(gb);
1299
        align_get_bits(gb);
1300
    }
1301
1302
    if (!sconf->mc_coding || ctx->js_switch) {
1303
        int independent_bs = !sconf->joint_stereo;
1304
1305
        for (c = 0; c < avctx->channels; c++) {
1306
            js_blocks[0] = 0;
1307
            js_blocks[1] = 0;
1308
1309
            get_block_sizes(ctx, div_blocks, &bs_info);
1310
1311
            // if joint_stereo and block_switching is set, independent decoding
1312
            // is signaled via the first bit of bs_info
1313
            if (sconf->joint_stereo && sconf->block_switching)
1314
                if (bs_info >> 31)
1315
                    independent_bs = 2;
1316
1317
            // if this is the last channel, it has to be decoded independently
1318
            if (c == avctx->channels - 1)
1319
                independent_bs = 1;
1320
1321
            if (independent_bs) {
1322
                if (decode_blocks_ind(ctx, ra_frame, c, div_blocks, js_blocks))
1323
                    return -1;
1324
1325
                independent_bs--;
1326
            } else {
1327
                if (decode_blocks(ctx, ra_frame, c, div_blocks, js_blocks))
1328
                    return -1;
1329
1330
                c++;
1331
            }
1332
1333
            // store carryover raw samples
1334
            memmove(ctx->raw_samples[c] - sconf->max_order,
1335
                    ctx->raw_samples[c] - sconf->max_order + sconf->frame_length,
1336
                    sizeof(*ctx->raw_samples[c]) * sconf->max_order);
1337
        }
1338
    } else { // multi-channel coding
1339 e38215f2 Thilo Borgmann
        ALSBlockData   bd;
1340
        int            b;
1341
        int            *reverted_channels = ctx->reverted_channels;
1342
        unsigned int   offset             = 0;
1343
1344
        for (c = 0; c < avctx->channels; c++)
1345
            if (ctx->chan_data[c] < ctx->chan_data_buffer) {
1346
                av_log(ctx->avctx, AV_LOG_ERROR, "Invalid channel data!\n");
1347
                return -1;
1348
            }
1349
1350
        memset(&bd,               0, sizeof(ALSBlockData));
1351
        memset(reverted_channels, 0, sizeof(*reverted_channels) * avctx->channels);
1352
1353
        bd.ra_block         = ra_frame;
1354
        bd.prev_raw_samples = ctx->prev_raw_samples;
1355
1356 99971952 Thilo Borgmann
        get_block_sizes(ctx, div_blocks, &bs_info);
1357
1358 e38215f2 Thilo Borgmann
        for (b = 0; b < ctx->num_blocks; b++) {
1359
            bd.block_length = div_blocks[b];
1360
1361
            for (c = 0; c < avctx->channels; c++) {
1362 efd63823 Sprezz
                bd.const_block = ctx->const_block + c;
1363
                bd.shift_lsbs  = ctx->shift_lsbs + c;
1364
                bd.opt_order   = ctx->opt_order + c;
1365
                bd.store_prev_samples = ctx->store_prev_samples + c;
1366 e38215f2 Thilo Borgmann
                bd.use_ltp     = ctx->use_ltp + c;
1367
                bd.ltp_lag     = ctx->ltp_lag + c;
1368
                bd.ltp_gain    = ctx->ltp_gain[c];
1369
                bd.lpc_cof     = ctx->lpc_cof[c];
1370
                bd.quant_cof   = ctx->quant_cof[c];
1371
                bd.raw_samples = ctx->raw_samples[c] + offset;
1372
                bd.raw_other   = NULL;
1373
1374
                read_block(ctx, &bd);
1375
                if (read_channel_data(ctx, ctx->chan_data[c], c))
1376
                    return -1;
1377
            }
1378
1379
            for (c = 0; c < avctx->channels; c++)
1380
                if (revert_channel_correlation(ctx, &bd, ctx->chan_data,
1381
                                               reverted_channels, offset, c))
1382
                    return -1;
1383
1384
            for (c = 0; c < avctx->channels; c++) {
1385 efd63823 Sprezz
                bd.const_block = ctx->const_block + c;
1386
                bd.shift_lsbs  = ctx->shift_lsbs + c;
1387
                bd.opt_order   = ctx->opt_order + c;
1388
                bd.store_prev_samples = ctx->store_prev_samples + c;
1389 e38215f2 Thilo Borgmann
                bd.use_ltp     = ctx->use_ltp + c;
1390
                bd.ltp_lag     = ctx->ltp_lag + c;
1391
                bd.ltp_gain    = ctx->ltp_gain[c];
1392
                bd.lpc_cof     = ctx->lpc_cof[c];
1393
                bd.quant_cof   = ctx->quant_cof[c];
1394
                bd.raw_samples = ctx->raw_samples[c] + offset;
1395
                decode_block(ctx, &bd);
1396
            }
1397
1398
            memset(reverted_channels, 0, avctx->channels * sizeof(*reverted_channels));
1399
            offset      += div_blocks[b];
1400
            bd.ra_block  = 0;
1401
        }
1402
1403
        // store carryover raw samples
1404
        for (c = 0; c < avctx->channels; c++)
1405
            memmove(ctx->raw_samples[c] - sconf->max_order,
1406
                    ctx->raw_samples[c] - sconf->max_order + sconf->frame_length,
1407
                    sizeof(*ctx->raw_samples[c]) * sconf->max_order);
1408 99971952 Thilo Borgmann
    }
1409
1410
    // TODO: read_diff_float_data
1411
1412
    return 0;
1413
}
1414
1415
1416 49bd8e4b Måns Rullgård
/** Decode an ALS frame.
1417 99971952 Thilo Borgmann
 */
1418
static int decode_frame(AVCodecContext *avctx,
1419
                        void *data, int *data_size,
1420
                        AVPacket *avpkt)
1421
{
1422
    ALSDecContext *ctx       = avctx->priv_data;
1423
    ALSSpecificConfig *sconf = &ctx->sconf;
1424
    const uint8_t *buffer    = avpkt->data;
1425
    int buffer_size          = avpkt->size;
1426
    int invalid_frame, size;
1427
    unsigned int c, sample, ra_frame, bytes_read, shift;
1428
1429
    init_get_bits(&ctx->gb, buffer, buffer_size * 8);
1430
1431
    // In the case that the distance between random access frames is set to zero
1432
    // (sconf->ra_distance == 0) no frame is treated as a random access frame.
1433
    // For the first frame, if prediction is used, all samples used from the
1434
    // previous frame are assumed to be zero.
1435
    ra_frame = sconf->ra_distance && !(ctx->frame_id % sconf->ra_distance);
1436
1437
    // the last frame to decode might have a different length
1438
    if (sconf->samples != 0xFFFFFFFF)
1439
        ctx->cur_frame_length = FFMIN(sconf->samples - ctx->frame_id * (uint64_t) sconf->frame_length,
1440
                                      sconf->frame_length);
1441
    else
1442
        ctx->cur_frame_length = sconf->frame_length;
1443
1444
    // decode the frame data
1445
    if ((invalid_frame = read_frame_data(ctx, ra_frame) < 0))
1446
        av_log(ctx->avctx, AV_LOG_WARNING,
1447
               "Reading frame data failed. Skipping RA unit.\n");
1448
1449
    ctx->frame_id++;
1450
1451
    // check for size of decoded data
1452
    size = ctx->cur_frame_length * avctx->channels *
1453 ba7d6e79 Stefano Sabatini
           (av_get_bits_per_sample_fmt(avctx->sample_fmt) >> 3);
1454 99971952 Thilo Borgmann
1455
    if (size > *data_size) {
1456
        av_log(avctx, AV_LOG_ERROR, "Decoded data exceeds buffer size.\n");
1457
        return -1;
1458
    }
1459
1460
    *data_size = size;
1461
1462
    // transform decoded frame into output format
1463
    #define INTERLEAVE_OUTPUT(bps)                                 \
1464
    {                                                              \
1465
        int##bps##_t *dest = (int##bps##_t*) data;                 \
1466
        shift = bps - ctx->avctx->bits_per_raw_sample;             \
1467
        for (sample = 0; sample < ctx->cur_frame_length; sample++) \
1468
            for (c = 0; c < avctx->channels; c++)                  \
1469
                *dest++ = ctx->raw_samples[c][sample] << shift;    \
1470
    }
1471
1472
    if (ctx->avctx->bits_per_raw_sample <= 16) {
1473
        INTERLEAVE_OUTPUT(16)
1474
    } else {
1475
        INTERLEAVE_OUTPUT(32)
1476
    }
1477
1478 cbb39648 Thilo Borgmann
    // update CRC
1479
    if (sconf->crc_enabled && avctx->error_recognition >= FF_ER_CAREFUL) {
1480
        int swap = HAVE_BIGENDIAN != sconf->msb_first;
1481
1482
        if (ctx->avctx->bits_per_raw_sample == 24) {
1483
            int32_t *src = data;
1484
1485
            for (sample = 0;
1486
                 sample < ctx->cur_frame_length * avctx->channels;
1487
                 sample++) {
1488
                int32_t v;
1489
1490
                if (swap)
1491 8fc0162a Måns Rullgård
                    v = av_bswap32(src[sample]);
1492 cbb39648 Thilo Borgmann
                else
1493
                    v = src[sample];
1494
                if (!HAVE_BIGENDIAN)
1495
                    v >>= 8;
1496
1497
                ctx->crc = av_crc(ctx->crc_table, ctx->crc, (uint8_t*)(&v), 3);
1498
            }
1499
        } else {
1500
            uint8_t *crc_source;
1501
1502
            if (swap) {
1503
                if (ctx->avctx->bits_per_raw_sample <= 16) {
1504
                    int16_t *src  = (int16_t*) data;
1505
                    int16_t *dest = (int16_t*) ctx->crc_buffer;
1506
                    for (sample = 0;
1507
                         sample < ctx->cur_frame_length * avctx->channels;
1508
                         sample++)
1509 8fc0162a Måns Rullgård
                        *dest++ = av_bswap16(src[sample]);
1510 cbb39648 Thilo Borgmann
                } else {
1511
                    ctx->dsp.bswap_buf((uint32_t*)ctx->crc_buffer, data,
1512
                                       ctx->cur_frame_length * avctx->channels);
1513
                }
1514
                crc_source = ctx->crc_buffer;
1515
            } else {
1516
                crc_source = data;
1517
            }
1518
1519
            ctx->crc = av_crc(ctx->crc_table, ctx->crc, crc_source, size);
1520
        }
1521
1522
1523
        // check CRC sums if this is the last frame
1524
        if (ctx->cur_frame_length != sconf->frame_length &&
1525
            ctx->crc_org != ctx->crc) {
1526
            av_log(avctx, AV_LOG_ERROR, "CRC error.\n");
1527
        }
1528
    }
1529
1530
1531 99971952 Thilo Borgmann
    bytes_read = invalid_frame ? buffer_size :
1532
                                 (get_bits_count(&ctx->gb) + 7) >> 3;
1533
1534
    return bytes_read;
1535
}
1536
1537
1538 49bd8e4b Måns Rullgård
/** Uninitialize the ALS decoder.
1539 99971952 Thilo Borgmann
 */
1540
static av_cold int decode_end(AVCodecContext *avctx)
1541
{
1542
    ALSDecContext *ctx = avctx->priv_data;
1543
1544
    av_freep(&ctx->sconf.chan_pos);
1545
1546 25608328 Thilo Borgmann
    ff_bgmc_end(&ctx->bgmc_lut, &ctx->bgmc_lut_status);
1547
1548 efd63823 Sprezz
    av_freep(&ctx->const_block);
1549
    av_freep(&ctx->shift_lsbs);
1550
    av_freep(&ctx->opt_order);
1551
    av_freep(&ctx->store_prev_samples);
1552 1261b07f Thilo Borgmann
    av_freep(&ctx->use_ltp);
1553
    av_freep(&ctx->ltp_lag);
1554
    av_freep(&ctx->ltp_gain);
1555
    av_freep(&ctx->ltp_gain_buffer);
1556 99971952 Thilo Borgmann
    av_freep(&ctx->quant_cof);
1557
    av_freep(&ctx->lpc_cof);
1558 e38215f2 Thilo Borgmann
    av_freep(&ctx->quant_cof_buffer);
1559
    av_freep(&ctx->lpc_cof_buffer);
1560 ff9ea0b7 Thilo Borgmann
    av_freep(&ctx->lpc_cof_reversed_buffer);
1561 99971952 Thilo Borgmann
    av_freep(&ctx->prev_raw_samples);
1562
    av_freep(&ctx->raw_samples);
1563
    av_freep(&ctx->raw_buffer);
1564 e38215f2 Thilo Borgmann
    av_freep(&ctx->chan_data);
1565
    av_freep(&ctx->chan_data_buffer);
1566
    av_freep(&ctx->reverted_channels);
1567 e0eb963a Vitor Sessak
    av_freep(&ctx->crc_buffer);
1568 99971952 Thilo Borgmann
1569
    return 0;
1570
}
1571
1572
1573 49bd8e4b Måns Rullgård
/** Initialize the ALS decoder.
1574 99971952 Thilo Borgmann
 */
1575
static av_cold int decode_init(AVCodecContext *avctx)
1576
{
1577
    unsigned int c;
1578
    unsigned int channel_size;
1579 1261b07f Thilo Borgmann
    int num_buffers;
1580 99971952 Thilo Borgmann
    ALSDecContext *ctx = avctx->priv_data;
1581
    ALSSpecificConfig *sconf = &ctx->sconf;
1582
    ctx->avctx = avctx;
1583
1584
    if (!avctx->extradata) {
1585
        av_log(avctx, AV_LOG_ERROR, "Missing required ALS extradata.\n");
1586
        return -1;
1587
    }
1588
1589
    if (read_specific_config(ctx)) {
1590
        av_log(avctx, AV_LOG_ERROR, "Reading ALSSpecificConfig failed.\n");
1591
        decode_end(avctx);
1592
        return -1;
1593
    }
1594
1595
    if (check_specific_config(ctx)) {
1596
        decode_end(avctx);
1597
        return -1;
1598
    }
1599
1600 25608328 Thilo Borgmann
    if (sconf->bgmc)
1601
        ff_bgmc_init(avctx, &ctx->bgmc_lut, &ctx->bgmc_lut_status);
1602
1603 99971952 Thilo Borgmann
    if (sconf->floating) {
1604 5d6e4c16 Stefano Sabatini
        avctx->sample_fmt          = AV_SAMPLE_FMT_FLT;
1605 99971952 Thilo Borgmann
        avctx->bits_per_raw_sample = 32;
1606
    } else {
1607
        avctx->sample_fmt          = sconf->resolution > 1
1608 5d6e4c16 Stefano Sabatini
                                     ? AV_SAMPLE_FMT_S32 : AV_SAMPLE_FMT_S16;
1609 99971952 Thilo Borgmann
        avctx->bits_per_raw_sample = (sconf->resolution + 1) * 8;
1610
    }
1611
1612 11431599 Thilo Borgmann
    // set maximum Rice parameter for progressive decoding based on resolution
1613
    // This is not specified in 14496-3 but actually done by the reference
1614
    // codec RM22 revision 2.
1615
    ctx->s_max = sconf->resolution > 1 ? 31 : 15;
1616
1617 93d38cf6 Thilo Borgmann
    // set lag value for long-term prediction
1618
    ctx->ltp_lag_length = 8 + (avctx->sample_rate >=  96000) +
1619
                              (avctx->sample_rate >= 192000);
1620
1621 1261b07f Thilo Borgmann
    // allocate quantized parcor coefficient buffer
1622
    num_buffers = sconf->mc_coding ? avctx->channels : 1;
1623
1624 e38215f2 Thilo Borgmann
    ctx->quant_cof        = av_malloc(sizeof(*ctx->quant_cof) * num_buffers);
1625
    ctx->lpc_cof          = av_malloc(sizeof(*ctx->lpc_cof)   * num_buffers);
1626
    ctx->quant_cof_buffer = av_malloc(sizeof(*ctx->quant_cof_buffer) *
1627
                                      num_buffers * sconf->max_order);
1628
    ctx->lpc_cof_buffer   = av_malloc(sizeof(*ctx->lpc_cof_buffer) *
1629
                                      num_buffers * sconf->max_order);
1630 ff9ea0b7 Thilo Borgmann
    ctx->lpc_cof_reversed_buffer = av_malloc(sizeof(*ctx->lpc_cof_buffer) *
1631
                                             sconf->max_order);
1632 e38215f2 Thilo Borgmann
1633 099809d1 Thilo Borgmann
    if (!ctx->quant_cof              || !ctx->lpc_cof        ||
1634
        !ctx->quant_cof_buffer       || !ctx->lpc_cof_buffer ||
1635 ff9ea0b7 Thilo Borgmann
        !ctx->lpc_cof_reversed_buffer) {
1636 e38215f2 Thilo Borgmann
        av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
1637
        return AVERROR(ENOMEM);
1638
    }
1639
1640
    // assign quantized parcor coefficient buffers
1641
    for (c = 0; c < num_buffers; c++) {
1642
        ctx->quant_cof[c] = ctx->quant_cof_buffer + c * sconf->max_order;
1643
        ctx->lpc_cof[c]   = ctx->lpc_cof_buffer   + c * sconf->max_order;
1644
    }
1645
1646 1261b07f Thilo Borgmann
    // allocate and assign lag and gain data buffer for ltp mode
1647 efd63823 Sprezz
    ctx->const_block     = av_malloc (sizeof(*ctx->const_block) * num_buffers);
1648
    ctx->shift_lsbs      = av_malloc (sizeof(*ctx->shift_lsbs)  * num_buffers);
1649
    ctx->opt_order       = av_malloc (sizeof(*ctx->opt_order)   * num_buffers);
1650
    ctx->store_prev_samples = av_malloc(sizeof(*ctx->store_prev_samples) * num_buffers);
1651 1261b07f Thilo Borgmann
    ctx->use_ltp         = av_mallocz(sizeof(*ctx->use_ltp)  * num_buffers);
1652
    ctx->ltp_lag         = av_malloc (sizeof(*ctx->ltp_lag)  * num_buffers);
1653
    ctx->ltp_gain        = av_malloc (sizeof(*ctx->ltp_gain) * num_buffers);
1654
    ctx->ltp_gain_buffer = av_malloc (sizeof(*ctx->ltp_gain_buffer) *
1655
                                      num_buffers * 5);
1656
1657 efd63823 Sprezz
    if (!ctx->const_block || !ctx->shift_lsbs ||
1658
        !ctx->opt_order || !ctx->store_prev_samples ||
1659
        !ctx->use_ltp  || !ctx->ltp_lag ||
1660 1261b07f Thilo Borgmann
        !ctx->ltp_gain || !ctx->ltp_gain_buffer) {
1661
        av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
1662
        decode_end(avctx);
1663
        return AVERROR(ENOMEM);
1664
    }
1665
1666
    for (c = 0; c < num_buffers; c++)
1667
        ctx->ltp_gain[c] = ctx->ltp_gain_buffer + c * 5;
1668
1669 e38215f2 Thilo Borgmann
    // allocate and assign channel data buffer for mcc mode
1670
    if (sconf->mc_coding) {
1671
        ctx->chan_data_buffer  = av_malloc(sizeof(*ctx->chan_data_buffer) *
1672 cd092849 Thilo Borgmann
                                           num_buffers * num_buffers);
1673 dc9e57a8 Thilo Borgmann
        ctx->chan_data         = av_malloc(sizeof(*ctx->chan_data) *
1674 e38215f2 Thilo Borgmann
                                           num_buffers);
1675
        ctx->reverted_channels = av_malloc(sizeof(*ctx->reverted_channels) *
1676
                                           num_buffers);
1677
1678
        if (!ctx->chan_data_buffer || !ctx->chan_data || !ctx->reverted_channels) {
1679
            av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
1680
            decode_end(avctx);
1681
            return AVERROR(ENOMEM);
1682
        }
1683
1684
        for (c = 0; c < num_buffers; c++)
1685 cd092849 Thilo Borgmann
            ctx->chan_data[c] = ctx->chan_data_buffer + c * num_buffers;
1686 e38215f2 Thilo Borgmann
    } else {
1687
        ctx->chan_data         = NULL;
1688
        ctx->chan_data_buffer  = NULL;
1689
        ctx->reverted_channels = NULL;
1690
    }
1691
1692 99971952 Thilo Borgmann
    avctx->frame_size = sconf->frame_length;
1693
    channel_size      = sconf->frame_length + sconf->max_order;
1694
1695
    ctx->prev_raw_samples = av_malloc (sizeof(*ctx->prev_raw_samples) * sconf->max_order);
1696
    ctx->raw_buffer       = av_mallocz(sizeof(*ctx->     raw_buffer)  * avctx->channels * channel_size);
1697
    ctx->raw_samples      = av_malloc (sizeof(*ctx->     raw_samples) * avctx->channels);
1698
1699
    // allocate previous raw sample buffer
1700
    if (!ctx->prev_raw_samples || !ctx->raw_buffer|| !ctx->raw_samples) {
1701
        av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
1702
        decode_end(avctx);
1703
        return AVERROR(ENOMEM);
1704
    }
1705
1706
    // assign raw samples buffers
1707
    ctx->raw_samples[0] = ctx->raw_buffer + sconf->max_order;
1708
    for (c = 1; c < avctx->channels; c++)
1709
        ctx->raw_samples[c] = ctx->raw_samples[c - 1] + channel_size;
1710
1711 cbb39648 Thilo Borgmann
    // allocate crc buffer
1712
    if (HAVE_BIGENDIAN != sconf->msb_first && sconf->crc_enabled &&
1713
        avctx->error_recognition >= FF_ER_CAREFUL) {
1714
        ctx->crc_buffer = av_malloc(sizeof(*ctx->crc_buffer) *
1715
                                    ctx->cur_frame_length *
1716
                                    avctx->channels *
1717 ba7d6e79 Stefano Sabatini
                                    (av_get_bits_per_sample_fmt(avctx->sample_fmt) >> 3));
1718 cbb39648 Thilo Borgmann
        if (!ctx->crc_buffer) {
1719
            av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
1720
            decode_end(avctx);
1721
            return AVERROR(ENOMEM);
1722
        }
1723
    }
1724
1725
    dsputil_init(&ctx->dsp, avctx);
1726
1727 99971952 Thilo Borgmann
    return 0;
1728
}
1729
1730
1731 49bd8e4b Måns Rullgård
/** Flush (reset) the frame ID after seeking.
1732 99971952 Thilo Borgmann
 */
1733
static av_cold void flush(AVCodecContext *avctx)
1734
{
1735
    ALSDecContext *ctx = avctx->priv_data;
1736
1737
    ctx->frame_id = 0;
1738
}
1739
1740
1741 d36beb3f Diego Elio Pettenò
AVCodec ff_als_decoder = {
1742 99971952 Thilo Borgmann
    "als",
1743 72415b2a Stefano Sabatini
    AVMEDIA_TYPE_AUDIO,
1744 99971952 Thilo Borgmann
    CODEC_ID_MP4ALS,
1745
    sizeof(ALSDecContext),
1746
    decode_init,
1747
    NULL,
1748
    decode_end,
1749
    decode_frame,
1750
    .flush = flush,
1751
    .capabilities = CODEC_CAP_SUBFRAMES,
1752
    .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 Audio Lossless Coding (ALS)"),
1753
};