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b517af05 RP |
1 | /* |
2 | * MLP decoder | |
3 | * Copyright (c) 2007-2008 Ian Caulfield | |
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 | /** | |
bad5537e | 23 | * @file libavcodec/mlpdec.c |
b517af05 RP |
24 | * MLP decoder |
25 | */ | |
26 | ||
0e74e1ff DB |
27 | #include <stdint.h> |
28 | ||
b517af05 RP |
29 | #include "avcodec.h" |
30 | #include "libavutil/intreadwrite.h" | |
31 | #include "bitstream.h" | |
32 | #include "libavutil/crc.h" | |
33 | #include "parser.h" | |
34 | #include "mlp_parser.h" | |
ce15710f | 35 | #include "mlp.h" |
b517af05 | 36 | |
9906a2be | 37 | /** number of bits used for VLC lookup - longest Huffman code is 9 */ |
b517af05 RP |
38 | #define VLC_BITS 9 |
39 | ||
40 | ||
41 | static const char* sample_message = | |
42 | "Please file a bug report following the instructions at " | |
0fa5f24c | 43 | "http://ffmpeg.org/bugreports.html and include " |
b517af05 RP |
44 | "a sample of this file."; |
45 | ||
46 | typedef struct SubStream { | |
9906a2be | 47 | //! Set if a valid restart header has been read. Otherwise the substream cannot be decoded. |
b517af05 RP |
48 | uint8_t restart_seen; |
49 | ||
50 | //@{ | |
51 | /** restart header data */ | |
52 | //! The type of noise to be used in the rematrix stage. | |
53 | uint16_t noise_type; | |
54 | ||
55 | //! The index of the first channel coded in this substream. | |
56 | uint8_t min_channel; | |
57 | //! The index of the last channel coded in this substream. | |
58 | uint8_t max_channel; | |
59 | //! The number of channels input into the rematrix stage. | |
60 | uint8_t max_matrix_channel; | |
9731e7f1 RP |
61 | //! For each channel output by the matrix, the output channel to map it to |
62 | uint8_t ch_assign[MAX_CHANNELS]; | |
b517af05 RP |
63 | |
64 | //! The left shift applied to random noise in 0x31ea substreams. | |
65 | uint8_t noise_shift; | |
66 | //! The current seed value for the pseudorandom noise generator(s). | |
67 | uint32_t noisegen_seed; | |
68 | ||
69 | //! Set if the substream contains extra info to check the size of VLC blocks. | |
70 | uint8_t data_check_present; | |
71 | ||
72 | //! Bitmask of which parameter sets are conveyed in a decoding parameter block. | |
73 | uint8_t param_presence_flags; | |
74 | #define PARAM_BLOCKSIZE (1 << 7) | |
75 | #define PARAM_MATRIX (1 << 6) | |
76 | #define PARAM_OUTSHIFT (1 << 5) | |
77 | #define PARAM_QUANTSTEP (1 << 4) | |
78 | #define PARAM_FIR (1 << 3) | |
79 | #define PARAM_IIR (1 << 2) | |
80 | #define PARAM_HUFFOFFSET (1 << 1) | |
cbf3cf19 | 81 | #define PARAM_PRESENCE (1 << 0) |
b517af05 RP |
82 | //@} |
83 | ||
84 | //@{ | |
85 | /** matrix data */ | |
86 | ||
87 | //! Number of matrices to be applied. | |
88 | uint8_t num_primitive_matrices; | |
89 | ||
90 | //! matrix output channel | |
91 | uint8_t matrix_out_ch[MAX_MATRICES]; | |
92 | ||
93 | //! Whether the LSBs of the matrix output are encoded in the bitstream. | |
94 | uint8_t lsb_bypass[MAX_MATRICES]; | |
95 | //! Matrix coefficients, stored as 2.14 fixed point. | |
96 | int32_t matrix_coeff[MAX_MATRICES][MAX_CHANNELS+2]; | |
97 | //! Left shift to apply to noise values in 0x31eb substreams. | |
98 | uint8_t matrix_noise_shift[MAX_MATRICES]; | |
99 | //@} | |
100 | ||
9906a2be | 101 | //! Left shift to apply to Huffman-decoded residuals. |
b517af05 RP |
102 | uint8_t quant_step_size[MAX_CHANNELS]; |
103 | ||
9906a2be | 104 | //! number of PCM samples in current audio block |
b517af05 RP |
105 | uint16_t blocksize; |
106 | //! Number of PCM samples decoded so far in this frame. | |
107 | uint16_t blockpos; | |
108 | ||
109 | //! Left shift to apply to decoded PCM values to get final 24-bit output. | |
110 | int8_t output_shift[MAX_CHANNELS]; | |
111 | ||
112 | //! Running XOR of all output samples. | |
113 | int32_t lossless_check_data; | |
114 | ||
115 | } SubStream; | |
116 | ||
117 | typedef struct MLPDecodeContext { | |
118 | AVCodecContext *avctx; | |
119 | ||
120 | //! Set if a valid major sync block has been read. Otherwise no decoding is possible. | |
121 | uint8_t params_valid; | |
122 | ||
123 | //! Number of substreams contained within this stream. | |
124 | uint8_t num_substreams; | |
125 | ||
126 | //! Index of the last substream to decode - further substreams are skipped. | |
127 | uint8_t max_decoded_substream; | |
128 | ||
9906a2be | 129 | //! number of PCM samples contained in each frame |
b517af05 | 130 | int access_unit_size; |
9906a2be | 131 | //! next power of two above the number of samples in each frame |
b517af05 RP |
132 | int access_unit_size_pow2; |
133 | ||
134 | SubStream substream[MAX_SUBSTREAMS]; | |
135 | ||
f53acb7b | 136 | ChannelParams channel_params[MAX_CHANNELS]; |
b517af05 RP |
137 | |
138 | int8_t noise_buffer[MAX_BLOCKSIZE_POW2]; | |
139 | int8_t bypassed_lsbs[MAX_BLOCKSIZE][MAX_CHANNELS]; | |
140 | int32_t sample_buffer[MAX_BLOCKSIZE][MAX_CHANNELS+2]; | |
141 | } MLPDecodeContext; | |
142 | ||
b517af05 RP |
143 | static VLC huff_vlc[3]; |
144 | ||
b517af05 RP |
145 | /** Initialize static data, constant between all invocations of the codec. */ |
146 | ||
dc8a7c93 | 147 | static av_cold void init_static(void) |
b517af05 RP |
148 | { |
149 | INIT_VLC_STATIC(&huff_vlc[0], VLC_BITS, 18, | |
ce15710f RP |
150 | &ff_mlp_huffman_tables[0][0][1], 2, 1, |
151 | &ff_mlp_huffman_tables[0][0][0], 2, 1, 512); | |
b517af05 | 152 | INIT_VLC_STATIC(&huff_vlc[1], VLC_BITS, 16, |
ce15710f RP |
153 | &ff_mlp_huffman_tables[1][0][1], 2, 1, |
154 | &ff_mlp_huffman_tables[1][0][0], 2, 1, 512); | |
b517af05 | 155 | INIT_VLC_STATIC(&huff_vlc[2], VLC_BITS, 15, |
ce15710f RP |
156 | &ff_mlp_huffman_tables[2][0][1], 2, 1, |
157 | &ff_mlp_huffman_tables[2][0][0], 2, 1, 512); | |
b517af05 | 158 | |
ce15710f | 159 | ff_mlp_init_crc(); |
b517af05 RP |
160 | } |
161 | ||
162 | static inline int32_t calculate_sign_huff(MLPDecodeContext *m, | |
163 | unsigned int substr, unsigned int ch) | |
164 | { | |
f53acb7b | 165 | ChannelParams *cp = &m->channel_params[ch]; |
b517af05 | 166 | SubStream *s = &m->substream[substr]; |
f53acb7b RP |
167 | int lsb_bits = cp->huff_lsbs - s->quant_step_size[ch]; |
168 | int sign_shift = lsb_bits + (cp->codebook ? 2 - cp->codebook : -1); | |
169 | int32_t sign_huff_offset = cp->huff_offset; | |
b517af05 | 170 | |
f53acb7b | 171 | if (cp->codebook > 0) |
b517af05 RP |
172 | sign_huff_offset -= 7 << lsb_bits; |
173 | ||
174 | if (sign_shift >= 0) | |
175 | sign_huff_offset -= 1 << sign_shift; | |
176 | ||
177 | return sign_huff_offset; | |
178 | } | |
179 | ||
180 | /** Read a sample, consisting of either, both or neither of entropy-coded MSBs | |
181 | * and plain LSBs. */ | |
182 | ||
183 | static inline int read_huff_channels(MLPDecodeContext *m, GetBitContext *gbp, | |
184 | unsigned int substr, unsigned int pos) | |
185 | { | |
186 | SubStream *s = &m->substream[substr]; | |
187 | unsigned int mat, channel; | |
188 | ||
189 | for (mat = 0; mat < s->num_primitive_matrices; mat++) | |
190 | if (s->lsb_bypass[mat]) | |
191 | m->bypassed_lsbs[pos + s->blockpos][mat] = get_bits1(gbp); | |
192 | ||
193 | for (channel = s->min_channel; channel <= s->max_channel; channel++) { | |
f53acb7b RP |
194 | ChannelParams *cp = &m->channel_params[channel]; |
195 | int codebook = cp->codebook; | |
b517af05 | 196 | int quant_step_size = s->quant_step_size[channel]; |
f53acb7b | 197 | int lsb_bits = cp->huff_lsbs - quant_step_size; |
b517af05 RP |
198 | int result = 0; |
199 | ||
200 | if (codebook > 0) | |
201 | result = get_vlc2(gbp, huff_vlc[codebook-1].table, | |
202 | VLC_BITS, (9 + VLC_BITS - 1) / VLC_BITS); | |
203 | ||
204 | if (result < 0) | |
205 | return -1; | |
206 | ||
207 | if (lsb_bits > 0) | |
208 | result = (result << lsb_bits) + get_bits(gbp, lsb_bits); | |
209 | ||
f53acb7b | 210 | result += cp->sign_huff_offset; |
b517af05 RP |
211 | result <<= quant_step_size; |
212 | ||
213 | m->sample_buffer[pos + s->blockpos][channel] = result; | |
214 | } | |
215 | ||
216 | return 0; | |
217 | } | |
218 | ||
219 | static av_cold int mlp_decode_init(AVCodecContext *avctx) | |
220 | { | |
221 | MLPDecodeContext *m = avctx->priv_data; | |
222 | int substr; | |
223 | ||
224 | init_static(); | |
225 | m->avctx = avctx; | |
226 | for (substr = 0; substr < MAX_SUBSTREAMS; substr++) | |
227 | m->substream[substr].lossless_check_data = 0xffffffff; | |
ee1a8f62 | 228 | |
b517af05 RP |
229 | return 0; |
230 | } | |
231 | ||
232 | /** Read a major sync info header - contains high level information about | |
233 | * the stream - sample rate, channel arrangement etc. Most of this | |
234 | * information is not actually necessary for decoding, only for playback. | |
235 | */ | |
236 | ||
237 | static int read_major_sync(MLPDecodeContext *m, GetBitContext *gb) | |
238 | { | |
239 | MLPHeaderInfo mh; | |
240 | int substr; | |
241 | ||
242 | if (ff_mlp_read_major_sync(m->avctx, &mh, gb) != 0) | |
243 | return -1; | |
244 | ||
245 | if (mh.group1_bits == 0) { | |
9906a2be | 246 | av_log(m->avctx, AV_LOG_ERROR, "invalid/unknown bits per sample\n"); |
b517af05 RP |
247 | return -1; |
248 | } | |
249 | if (mh.group2_bits > mh.group1_bits) { | |
250 | av_log(m->avctx, AV_LOG_ERROR, | |
9906a2be | 251 | "Channel group 2 cannot have more bits per sample than group 1.\n"); |
b517af05 RP |
252 | return -1; |
253 | } | |
254 | ||
255 | if (mh.group2_samplerate && mh.group2_samplerate != mh.group1_samplerate) { | |
256 | av_log(m->avctx, AV_LOG_ERROR, | |
9906a2be | 257 | "Channel groups with differing sample rates are not currently supported.\n"); |
b517af05 RP |
258 | return -1; |
259 | } | |
260 | ||
261 | if (mh.group1_samplerate == 0) { | |
9906a2be | 262 | av_log(m->avctx, AV_LOG_ERROR, "invalid/unknown sampling rate\n"); |
b517af05 RP |
263 | return -1; |
264 | } | |
265 | if (mh.group1_samplerate > MAX_SAMPLERATE) { | |
266 | av_log(m->avctx, AV_LOG_ERROR, | |
9906a2be | 267 | "Sampling rate %d is greater than the supported maximum (%d).\n", |
b517af05 RP |
268 | mh.group1_samplerate, MAX_SAMPLERATE); |
269 | return -1; | |
270 | } | |
271 | if (mh.access_unit_size > MAX_BLOCKSIZE) { | |
272 | av_log(m->avctx, AV_LOG_ERROR, | |
9906a2be | 273 | "Block size %d is greater than the supported maximum (%d).\n", |
b517af05 RP |
274 | mh.access_unit_size, MAX_BLOCKSIZE); |
275 | return -1; | |
276 | } | |
277 | if (mh.access_unit_size_pow2 > MAX_BLOCKSIZE_POW2) { | |
278 | av_log(m->avctx, AV_LOG_ERROR, | |
9906a2be | 279 | "Block size pow2 %d is greater than the supported maximum (%d).\n", |
b517af05 RP |
280 | mh.access_unit_size_pow2, MAX_BLOCKSIZE_POW2); |
281 | return -1; | |
282 | } | |
283 | ||
284 | if (mh.num_substreams == 0) | |
285 | return -1; | |
932cee5d RP |
286 | if (m->avctx->codec_id == CODEC_ID_MLP && mh.num_substreams > 2) { |
287 | av_log(m->avctx, AV_LOG_ERROR, "MLP only supports up to 2 substreams.\n"); | |
288 | return -1; | |
289 | } | |
b517af05 RP |
290 | if (mh.num_substreams > MAX_SUBSTREAMS) { |
291 | av_log(m->avctx, AV_LOG_ERROR, | |
9906a2be DB |
292 | "Number of substreams %d is larger than the maximum supported " |
293 | "by the decoder. %s\n", mh.num_substreams, sample_message); | |
b517af05 RP |
294 | return -1; |
295 | } | |
296 | ||
297 | m->access_unit_size = mh.access_unit_size; | |
298 | m->access_unit_size_pow2 = mh.access_unit_size_pow2; | |
299 | ||
300 | m->num_substreams = mh.num_substreams; | |
301 | m->max_decoded_substream = m->num_substreams - 1; | |
302 | ||
303 | m->avctx->sample_rate = mh.group1_samplerate; | |
304 | m->avctx->frame_size = mh.access_unit_size; | |
305 | ||
97679e6e | 306 | m->avctx->bits_per_raw_sample = mh.group1_bits; |
c687643c | 307 | if (mh.group1_bits > 16) |
b517af05 | 308 | m->avctx->sample_fmt = SAMPLE_FMT_S32; |
ee1a8f62 RP |
309 | else |
310 | m->avctx->sample_fmt = SAMPLE_FMT_S16; | |
b517af05 RP |
311 | |
312 | m->params_valid = 1; | |
313 | for (substr = 0; substr < MAX_SUBSTREAMS; substr++) | |
314 | m->substream[substr].restart_seen = 0; | |
315 | ||
316 | return 0; | |
317 | } | |
318 | ||
319 | /** Read a restart header from a block in a substream. This contains parameters | |
320 | * required to decode the audio that do not change very often. Generally | |
321 | * (always) present only in blocks following a major sync. */ | |
322 | ||
323 | static int read_restart_header(MLPDecodeContext *m, GetBitContext *gbp, | |
324 | const uint8_t *buf, unsigned int substr) | |
325 | { | |
326 | SubStream *s = &m->substream[substr]; | |
327 | unsigned int ch; | |
328 | int sync_word, tmp; | |
329 | uint8_t checksum; | |
330 | uint8_t lossless_check; | |
331 | int start_count = get_bits_count(gbp); | |
332 | ||
333 | sync_word = get_bits(gbp, 13); | |
334 | ||
335 | if (sync_word != 0x31ea >> 1) { | |
336 | av_log(m->avctx, AV_LOG_ERROR, | |
9906a2be | 337 | "restart header sync incorrect (got 0x%04x)\n", sync_word); |
b517af05 RP |
338 | return -1; |
339 | } | |
340 | s->noise_type = get_bits1(gbp); | |
341 | ||
342 | skip_bits(gbp, 16); /* Output timestamp */ | |
343 | ||
344 | s->min_channel = get_bits(gbp, 4); | |
345 | s->max_channel = get_bits(gbp, 4); | |
346 | s->max_matrix_channel = get_bits(gbp, 4); | |
347 | ||
348 | if (s->min_channel > s->max_channel) { | |
349 | av_log(m->avctx, AV_LOG_ERROR, | |
350 | "Substream min channel cannot be greater than max channel.\n"); | |
351 | return -1; | |
352 | } | |
353 | ||
354 | if (m->avctx->request_channels > 0 | |
355 | && s->max_channel + 1 >= m->avctx->request_channels | |
356 | && substr < m->max_decoded_substream) { | |
357 | av_log(m->avctx, AV_LOG_INFO, | |
358 | "Extracting %d channel downmix from substream %d. " | |
359 | "Further substreams will be skipped.\n", | |
360 | s->max_channel + 1, substr); | |
361 | m->max_decoded_substream = substr; | |
362 | } | |
363 | ||
364 | s->noise_shift = get_bits(gbp, 4); | |
365 | s->noisegen_seed = get_bits(gbp, 23); | |
366 | ||
367 | skip_bits(gbp, 19); | |
368 | ||
369 | s->data_check_present = get_bits1(gbp); | |
370 | lossless_check = get_bits(gbp, 8); | |
371 | if (substr == m->max_decoded_substream | |
372 | && s->lossless_check_data != 0xffffffff) { | |
a7cc783d | 373 | tmp = xor_32_to_8(s->lossless_check_data); |
b517af05 RP |
374 | if (tmp != lossless_check) |
375 | av_log(m->avctx, AV_LOG_WARNING, | |
9906a2be | 376 | "Lossless check failed - expected %02x, calculated %02x.\n", |
b517af05 | 377 | lossless_check, tmp); |
b517af05 RP |
378 | } |
379 | ||
380 | skip_bits(gbp, 16); | |
381 | ||
9731e7f1 RP |
382 | memset(s->ch_assign, 0, sizeof(s->ch_assign)); |
383 | ||
b517af05 RP |
384 | for (ch = 0; ch <= s->max_matrix_channel; ch++) { |
385 | int ch_assign = get_bits(gbp, 6); | |
9731e7f1 | 386 | if (ch_assign > s->max_matrix_channel) { |
b517af05 | 387 | av_log(m->avctx, AV_LOG_ERROR, |
9731e7f1 RP |
388 | "Assignment of matrix channel %d to invalid output channel %d. %s\n", |
389 | ch, ch_assign, sample_message); | |
b517af05 RP |
390 | return -1; |
391 | } | |
9731e7f1 | 392 | s->ch_assign[ch_assign] = ch; |
b517af05 RP |
393 | } |
394 | ||
ce15710f | 395 | checksum = ff_mlp_restart_checksum(buf, get_bits_count(gbp) - start_count); |
b517af05 RP |
396 | |
397 | if (checksum != get_bits(gbp, 8)) | |
9906a2be | 398 | av_log(m->avctx, AV_LOG_ERROR, "restart header checksum error\n"); |
b517af05 | 399 | |
9906a2be | 400 | /* Set default decoding parameters. */ |
b517af05 RP |
401 | s->param_presence_flags = 0xff; |
402 | s->num_primitive_matrices = 0; | |
403 | s->blocksize = 8; | |
404 | s->lossless_check_data = 0; | |
405 | ||
406 | memset(s->output_shift , 0, sizeof(s->output_shift )); | |
407 | memset(s->quant_step_size, 0, sizeof(s->quant_step_size)); | |
408 | ||
409 | for (ch = s->min_channel; ch <= s->max_channel; ch++) { | |
f53acb7b RP |
410 | ChannelParams *cp = &m->channel_params[ch]; |
411 | cp->filter_params[FIR].order = 0; | |
412 | cp->filter_params[IIR].order = 0; | |
413 | cp->filter_params[FIR].shift = 0; | |
414 | cp->filter_params[IIR].shift = 0; | |
b517af05 | 415 | |
9906a2be | 416 | /* Default audio coding is 24-bit raw PCM. */ |
f53acb7b RP |
417 | cp->huff_offset = 0; |
418 | cp->sign_huff_offset = (-1) << 23; | |
419 | cp->codebook = 0; | |
420 | cp->huff_lsbs = 24; | |
b517af05 RP |
421 | } |
422 | ||
423 | if (substr == m->max_decoded_substream) { | |
9731e7f1 | 424 | m->avctx->channels = s->max_matrix_channel + 1; |
b517af05 RP |
425 | } |
426 | ||
427 | return 0; | |
428 | } | |
429 | ||
430 | /** Read parameters for one of the prediction filters. */ | |
431 | ||
432 | static int read_filter_params(MLPDecodeContext *m, GetBitContext *gbp, | |
433 | unsigned int channel, unsigned int filter) | |
434 | { | |
f53acb7b | 435 | FilterParams *fp = &m->channel_params[channel].filter_params[filter]; |
0c5670a0 | 436 | const int max_order = filter ? MAX_IIR_ORDER : MAX_FIR_ORDER; |
b517af05 RP |
437 | const char fchar = filter ? 'I' : 'F'; |
438 | int i, order; | |
439 | ||
9906a2be | 440 | // Filter is 0 for FIR, 1 for IIR. |
b517af05 RP |
441 | assert(filter < 2); |
442 | ||
443 | order = get_bits(gbp, 4); | |
0c5670a0 | 444 | if (order > max_order) { |
b517af05 | 445 | av_log(m->avctx, AV_LOG_ERROR, |
9906a2be | 446 | "%cIR filter order %d is greater than maximum %d.\n", |
0c5670a0 | 447 | fchar, order, max_order); |
b517af05 RP |
448 | return -1; |
449 | } | |
d6aa052d | 450 | fp->order = order; |
b517af05 RP |
451 | |
452 | if (order > 0) { | |
453 | int coeff_bits, coeff_shift; | |
454 | ||
d6aa052d | 455 | fp->shift = get_bits(gbp, 4); |
b517af05 RP |
456 | |
457 | coeff_bits = get_bits(gbp, 5); | |
458 | coeff_shift = get_bits(gbp, 3); | |
459 | if (coeff_bits < 1 || coeff_bits > 16) { | |
460 | av_log(m->avctx, AV_LOG_ERROR, | |
9906a2be | 461 | "%cIR filter coeff_bits must be between 1 and 16.\n", |
b517af05 RP |
462 | fchar); |
463 | return -1; | |
464 | } | |
465 | if (coeff_bits + coeff_shift > 16) { | |
466 | av_log(m->avctx, AV_LOG_ERROR, | |
9906a2be | 467 | "Sum of coeff_bits and coeff_shift for %cIR filter must be 16 or less.\n", |
b517af05 RP |
468 | fchar); |
469 | return -1; | |
470 | } | |
471 | ||
472 | for (i = 0; i < order; i++) | |
db01fa13 | 473 | fp->coeff[i] = get_sbits(gbp, coeff_bits) << coeff_shift; |
b517af05 RP |
474 | |
475 | if (get_bits1(gbp)) { | |
476 | int state_bits, state_shift; | |
477 | ||
478 | if (filter == FIR) { | |
479 | av_log(m->avctx, AV_LOG_ERROR, | |
9906a2be | 480 | "FIR filter has state data specified.\n"); |
b517af05 RP |
481 | return -1; |
482 | } | |
483 | ||
484 | state_bits = get_bits(gbp, 4); | |
485 | state_shift = get_bits(gbp, 4); | |
486 | ||
9906a2be | 487 | /* TODO: Check validity of state data. */ |
b517af05 RP |
488 | |
489 | for (i = 0; i < order; i++) | |
db01fa13 | 490 | fp->state[i] = get_sbits(gbp, state_bits) << state_shift; |
b517af05 RP |
491 | } |
492 | } | |
493 | ||
494 | return 0; | |
495 | } | |
496 | ||
f8e6293b RP |
497 | /** Read parameters for primitive matrices. */ |
498 | ||
499 | static int read_matrix_params(MLPDecodeContext *m, SubStream *s, GetBitContext *gbp) | |
500 | { | |
501 | unsigned int mat, ch; | |
502 | ||
503 | s->num_primitive_matrices = get_bits(gbp, 4); | |
504 | ||
505 | for (mat = 0; mat < s->num_primitive_matrices; mat++) { | |
506 | int frac_bits, max_chan; | |
507 | s->matrix_out_ch[mat] = get_bits(gbp, 4); | |
508 | frac_bits = get_bits(gbp, 4); | |
509 | s->lsb_bypass [mat] = get_bits1(gbp); | |
510 | ||
511 | if (s->matrix_out_ch[mat] > s->max_channel) { | |
512 | av_log(m->avctx, AV_LOG_ERROR, | |
513 | "Invalid channel %d specified as output from matrix.\n", | |
514 | s->matrix_out_ch[mat]); | |
515 | return -1; | |
516 | } | |
517 | if (frac_bits > 14) { | |
518 | av_log(m->avctx, AV_LOG_ERROR, | |
519 | "Too many fractional bits specified.\n"); | |
520 | return -1; | |
521 | } | |
522 | ||
523 | max_chan = s->max_matrix_channel; | |
524 | if (!s->noise_type) | |
525 | max_chan+=2; | |
526 | ||
527 | for (ch = 0; ch <= max_chan; ch++) { | |
528 | int coeff_val = 0; | |
529 | if (get_bits1(gbp)) | |
530 | coeff_val = get_sbits(gbp, frac_bits + 2); | |
531 | ||
532 | s->matrix_coeff[mat][ch] = coeff_val << (14 - frac_bits); | |
533 | } | |
534 | ||
535 | if (s->noise_type) | |
536 | s->matrix_noise_shift[mat] = get_bits(gbp, 4); | |
537 | else | |
538 | s->matrix_noise_shift[mat] = 0; | |
539 | } | |
540 | ||
541 | return 0; | |
542 | } | |
543 | ||
43ee5fe0 RP |
544 | /** Read channel parameters. */ |
545 | ||
546 | static int read_channel_params(MLPDecodeContext *m, unsigned int substr, | |
547 | GetBitContext *gbp, unsigned int ch) | |
548 | { | |
549 | ChannelParams *cp = &m->channel_params[ch]; | |
550 | FilterParams *fir = &cp->filter_params[FIR]; | |
551 | FilterParams *iir = &cp->filter_params[IIR]; | |
552 | SubStream *s = &m->substream[substr]; | |
553 | ||
554 | if (s->param_presence_flags & PARAM_FIR) | |
555 | if (get_bits1(gbp)) | |
556 | if (read_filter_params(m, gbp, ch, FIR) < 0) | |
557 | return -1; | |
558 | ||
559 | if (s->param_presence_flags & PARAM_IIR) | |
560 | if (get_bits1(gbp)) | |
561 | if (read_filter_params(m, gbp, ch, IIR) < 0) | |
562 | return -1; | |
563 | ||
125cf771 RP |
564 | if (fir->order + iir->order > 8) { |
565 | av_log(m->avctx, AV_LOG_ERROR, "Total filter orders too high.\n"); | |
566 | return -1; | |
567 | } | |
568 | ||
43ee5fe0 RP |
569 | if (fir->order && iir->order && |
570 | fir->shift != iir->shift) { | |
571 | av_log(m->avctx, AV_LOG_ERROR, | |
572 | "FIR and IIR filters must use the same precision.\n"); | |
573 | return -1; | |
574 | } | |
575 | /* The FIR and IIR filters must have the same precision. | |
576 | * To simplify the filtering code, only the precision of the | |
577 | * FIR filter is considered. If only the IIR filter is employed, | |
578 | * the FIR filter precision is set to that of the IIR filter, so | |
579 | * that the filtering code can use it. */ | |
580 | if (!fir->order && iir->order) | |
581 | fir->shift = iir->shift; | |
582 | ||
583 | if (s->param_presence_flags & PARAM_HUFFOFFSET) | |
584 | if (get_bits1(gbp)) | |
585 | cp->huff_offset = get_sbits(gbp, 15); | |
586 | ||
587 | cp->codebook = get_bits(gbp, 2); | |
588 | cp->huff_lsbs = get_bits(gbp, 5); | |
589 | ||
125cf771 RP |
590 | if (cp->huff_lsbs > 24) { |
591 | av_log(m->avctx, AV_LOG_ERROR, "Invalid huff_lsbs.\n"); | |
592 | return -1; | |
593 | } | |
43ee5fe0 | 594 | |
125cf771 | 595 | cp->sign_huff_offset = calculate_sign_huff(m, substr, ch); |
43ee5fe0 RP |
596 | |
597 | return 0; | |
598 | } | |
599 | ||
b517af05 RP |
600 | /** Read decoding parameters that change more often than those in the restart |
601 | * header. */ | |
602 | ||
603 | static int read_decoding_params(MLPDecodeContext *m, GetBitContext *gbp, | |
604 | unsigned int substr) | |
605 | { | |
606 | SubStream *s = &m->substream[substr]; | |
f8e6293b | 607 | unsigned int ch; |
b517af05 | 608 | |
cbf3cf19 | 609 | if (s->param_presence_flags & PARAM_PRESENCE) |
b517af05 RP |
610 | if (get_bits1(gbp)) |
611 | s->param_presence_flags = get_bits(gbp, 8); | |
612 | ||
613 | if (s->param_presence_flags & PARAM_BLOCKSIZE) | |
614 | if (get_bits1(gbp)) { | |
615 | s->blocksize = get_bits(gbp, 9); | |
b864098c RP |
616 | if (s->blocksize < 8 || s->blocksize > m->access_unit_size) { |
617 | av_log(m->avctx, AV_LOG_ERROR, "Invalid blocksize."); | |
b517af05 RP |
618 | s->blocksize = 0; |
619 | return -1; | |
620 | } | |
621 | } | |
622 | ||
623 | if (s->param_presence_flags & PARAM_MATRIX) | |
624 | if (get_bits1(gbp)) { | |
f8e6293b RP |
625 | if (read_matrix_params(m, s, gbp) < 0) |
626 | return -1; | |
b517af05 RP |
627 | } |
628 | ||
629 | if (s->param_presence_flags & PARAM_OUTSHIFT) | |
630 | if (get_bits1(gbp)) | |
631 | for (ch = 0; ch <= s->max_matrix_channel; ch++) { | |
af048026 | 632 | s->output_shift[ch] = get_sbits(gbp, 4); |
b517af05 RP |
633 | } |
634 | ||
635 | if (s->param_presence_flags & PARAM_QUANTSTEP) | |
636 | if (get_bits1(gbp)) | |
637 | for (ch = 0; ch <= s->max_channel; ch++) { | |
f53acb7b RP |
638 | ChannelParams *cp = &m->channel_params[ch]; |
639 | ||
b517af05 | 640 | s->quant_step_size[ch] = get_bits(gbp, 4); |
b517af05 | 641 | |
f53acb7b | 642 | cp->sign_huff_offset = calculate_sign_huff(m, substr, ch); |
b517af05 RP |
643 | } |
644 | ||
645 | for (ch = s->min_channel; ch <= s->max_channel; ch++) | |
646 | if (get_bits1(gbp)) { | |
43ee5fe0 | 647 | if (read_channel_params(m, substr, gbp, ch) < 0) |
b517af05 | 648 | return -1; |
b517af05 RP |
649 | } |
650 | ||
651 | return 0; | |
652 | } | |
653 | ||
654 | #define MSB_MASK(bits) (-1u << bits) | |
655 | ||
656 | /** Generate PCM samples using the prediction filters and residual values | |
657 | * read from the data stream, and update the filter state. */ | |
658 | ||
659 | static void filter_channel(MLPDecodeContext *m, unsigned int substr, | |
660 | unsigned int channel) | |
661 | { | |
662 | SubStream *s = &m->substream[substr]; | |
e71365f4 RP |
663 | int32_t firbuf[MAX_BLOCKSIZE + MAX_FIR_ORDER]; |
664 | int32_t iirbuf[MAX_BLOCKSIZE + MAX_IIR_ORDER]; | |
665 | FilterParams *fir = &m->channel_params[channel].filter_params[FIR]; | |
666 | FilterParams *iir = &m->channel_params[channel].filter_params[IIR]; | |
667 | unsigned int filter_shift = fir->shift; | |
b517af05 RP |
668 | int32_t mask = MSB_MASK(s->quant_step_size[channel]); |
669 | int index = MAX_BLOCKSIZE; | |
0ae59bb0 | 670 | int i; |
b517af05 | 671 | |
06e34be8 RP |
672 | memcpy(&firbuf[index], fir->state, MAX_FIR_ORDER * sizeof(int32_t)); |
673 | memcpy(&iirbuf[index], iir->state, MAX_IIR_ORDER * sizeof(int32_t)); | |
b517af05 RP |
674 | |
675 | for (i = 0; i < s->blocksize; i++) { | |
676 | int32_t residual = m->sample_buffer[i + s->blockpos][channel]; | |
677 | unsigned int order; | |
678 | int64_t accum = 0; | |
679 | int32_t result; | |
680 | ||
681 | /* TODO: Move this code to DSPContext? */ | |
682 | ||
e71365f4 | 683 | for (order = 0; order < fir->order; order++) |
06e34be8 | 684 | accum += (int64_t) firbuf[index + order] * fir->coeff[order]; |
e71365f4 | 685 | for (order = 0; order < iir->order; order++) |
06e34be8 | 686 | accum += (int64_t) iirbuf[index + order] * iir->coeff[order]; |
b517af05 RP |
687 | |
688 | accum = accum >> filter_shift; | |
689 | result = (accum + residual) & mask; | |
690 | ||
691 | --index; | |
692 | ||
e71365f4 RP |
693 | firbuf[index] = result; |
694 | iirbuf[index] = result - accum; | |
b517af05 RP |
695 | |
696 | m->sample_buffer[i + s->blockpos][channel] = result; | |
697 | } | |
698 | ||
06e34be8 RP |
699 | memcpy(fir->state, &firbuf[index], MAX_FIR_ORDER * sizeof(int32_t)); |
700 | memcpy(iir->state, &iirbuf[index], MAX_IIR_ORDER * sizeof(int32_t)); | |
b517af05 RP |
701 | } |
702 | ||
703 | /** Read a block of PCM residual data (or actual if no filtering active). */ | |
704 | ||
705 | static int read_block_data(MLPDecodeContext *m, GetBitContext *gbp, | |
706 | unsigned int substr) | |
707 | { | |
708 | SubStream *s = &m->substream[substr]; | |
709 | unsigned int i, ch, expected_stream_pos = 0; | |
710 | ||
711 | if (s->data_check_present) { | |
712 | expected_stream_pos = get_bits_count(gbp); | |
713 | expected_stream_pos += get_bits(gbp, 16); | |
714 | av_log(m->avctx, AV_LOG_WARNING, "This file contains some features " | |
715 | "we have not tested yet. %s\n", sample_message); | |
716 | } | |
717 | ||
718 | if (s->blockpos + s->blocksize > m->access_unit_size) { | |
9906a2be | 719 | av_log(m->avctx, AV_LOG_ERROR, "too many audio samples in frame\n"); |
b517af05 RP |
720 | return -1; |
721 | } | |
722 | ||
723 | memset(&m->bypassed_lsbs[s->blockpos][0], 0, | |
724 | s->blocksize * sizeof(m->bypassed_lsbs[0])); | |
725 | ||
726 | for (i = 0; i < s->blocksize; i++) { | |
727 | if (read_huff_channels(m, gbp, substr, i) < 0) | |
728 | return -1; | |
729 | } | |
730 | ||
731 | for (ch = s->min_channel; ch <= s->max_channel; ch++) { | |
732 | filter_channel(m, substr, ch); | |
733 | } | |
734 | ||
735 | s->blockpos += s->blocksize; | |
736 | ||
737 | if (s->data_check_present) { | |
738 | if (get_bits_count(gbp) != expected_stream_pos) | |
9906a2be | 739 | av_log(m->avctx, AV_LOG_ERROR, "block data length mismatch\n"); |
b517af05 RP |
740 | skip_bits(gbp, 8); |
741 | } | |
742 | ||
743 | return 0; | |
744 | } | |
745 | ||
9906a2be | 746 | /** Data table used for TrueHD noise generation function. */ |
b517af05 RP |
747 | |
748 | static const int8_t noise_table[256] = { | |
749 | 30, 51, 22, 54, 3, 7, -4, 38, 14, 55, 46, 81, 22, 58, -3, 2, | |
750 | 52, 31, -7, 51, 15, 44, 74, 30, 85, -17, 10, 33, 18, 80, 28, 62, | |
751 | 10, 32, 23, 69, 72, 26, 35, 17, 73, 60, 8, 56, 2, 6, -2, -5, | |
752 | 51, 4, 11, 50, 66, 76, 21, 44, 33, 47, 1, 26, 64, 48, 57, 40, | |
753 | 38, 16, -10, -28, 92, 22, -18, 29, -10, 5, -13, 49, 19, 24, 70, 34, | |
754 | 61, 48, 30, 14, -6, 25, 58, 33, 42, 60, 67, 17, 54, 17, 22, 30, | |
755 | 67, 44, -9, 50, -11, 43, 40, 32, 59, 82, 13, 49, -14, 55, 60, 36, | |
756 | 48, 49, 31, 47, 15, 12, 4, 65, 1, 23, 29, 39, 45, -2, 84, 69, | |
757 | 0, 72, 37, 57, 27, 41, -15, -16, 35, 31, 14, 61, 24, 0, 27, 24, | |
758 | 16, 41, 55, 34, 53, 9, 56, 12, 25, 29, 53, 5, 20, -20, -8, 20, | |
759 | 13, 28, -3, 78, 38, 16, 11, 62, 46, 29, 21, 24, 46, 65, 43, -23, | |
760 | 89, 18, 74, 21, 38, -12, 19, 12, -19, 8, 15, 33, 4, 57, 9, -8, | |
761 | 36, 35, 26, 28, 7, 83, 63, 79, 75, 11, 3, 87, 37, 47, 34, 40, | |
762 | 39, 19, 20, 42, 27, 34, 39, 77, 13, 42, 59, 64, 45, -1, 32, 37, | |
763 | 45, -5, 53, -6, 7, 36, 50, 23, 6, 32, 9, -21, 18, 71, 27, 52, | |
764 | -25, 31, 35, 42, -1, 68, 63, 52, 26, 43, 66, 37, 41, 25, 40, 70, | |
765 | }; | |
766 | ||
767 | /** Noise generation functions. | |
768 | * I'm not sure what these are for - they seem to be some kind of pseudorandom | |
769 | * sequence generators, used to generate noise data which is used when the | |
770 | * channels are rematrixed. I'm not sure if they provide a practical benefit | |
771 | * to compression, or just obfuscate the decoder. Are they for some kind of | |
772 | * dithering? */ | |
773 | ||
774 | /** Generate two channels of noise, used in the matrix when | |
775 | * restart sync word == 0x31ea. */ | |
776 | ||
777 | static void generate_2_noise_channels(MLPDecodeContext *m, unsigned int substr) | |
778 | { | |
779 | SubStream *s = &m->substream[substr]; | |
780 | unsigned int i; | |
781 | uint32_t seed = s->noisegen_seed; | |
782 | unsigned int maxchan = s->max_matrix_channel; | |
783 | ||
784 | for (i = 0; i < s->blockpos; i++) { | |
785 | uint16_t seed_shr7 = seed >> 7; | |
786 | m->sample_buffer[i][maxchan+1] = ((int8_t)(seed >> 15)) << s->noise_shift; | |
787 | m->sample_buffer[i][maxchan+2] = ((int8_t) seed_shr7) << s->noise_shift; | |
788 | ||
789 | seed = (seed << 16) ^ seed_shr7 ^ (seed_shr7 << 5); | |
790 | } | |
791 | ||
792 | s->noisegen_seed = seed; | |
793 | } | |
794 | ||
795 | /** Generate a block of noise, used when restart sync word == 0x31eb. */ | |
796 | ||
797 | static void fill_noise_buffer(MLPDecodeContext *m, unsigned int substr) | |
798 | { | |
799 | SubStream *s = &m->substream[substr]; | |
800 | unsigned int i; | |
801 | uint32_t seed = s->noisegen_seed; | |
802 | ||
803 | for (i = 0; i < m->access_unit_size_pow2; i++) { | |
804 | uint8_t seed_shr15 = seed >> 15; | |
805 | m->noise_buffer[i] = noise_table[seed_shr15]; | |
806 | seed = (seed << 8) ^ seed_shr15 ^ (seed_shr15 << 5); | |
807 | } | |
808 | ||
809 | s->noisegen_seed = seed; | |
810 | } | |
811 | ||
812 | ||
813 | /** Apply the channel matrices in turn to reconstruct the original audio | |
814 | * samples. */ | |
815 | ||
816 | static void rematrix_channels(MLPDecodeContext *m, unsigned int substr) | |
817 | { | |
818 | SubStream *s = &m->substream[substr]; | |
819 | unsigned int mat, src_ch, i; | |
820 | unsigned int maxchan; | |
821 | ||
822 | maxchan = s->max_matrix_channel; | |
823 | if (!s->noise_type) { | |
824 | generate_2_noise_channels(m, substr); | |
825 | maxchan += 2; | |
826 | } else { | |
827 | fill_noise_buffer(m, substr); | |
828 | } | |
829 | ||
830 | for (mat = 0; mat < s->num_primitive_matrices; mat++) { | |
831 | int matrix_noise_shift = s->matrix_noise_shift[mat]; | |
832 | unsigned int dest_ch = s->matrix_out_ch[mat]; | |
833 | int32_t mask = MSB_MASK(s->quant_step_size[dest_ch]); | |
834 | ||
835 | /* TODO: DSPContext? */ | |
836 | ||
837 | for (i = 0; i < s->blockpos; i++) { | |
838 | int64_t accum = 0; | |
839 | for (src_ch = 0; src_ch <= maxchan; src_ch++) { | |
840 | accum += (int64_t)m->sample_buffer[i][src_ch] | |
841 | * s->matrix_coeff[mat][src_ch]; | |
842 | } | |
843 | if (matrix_noise_shift) { | |
844 | uint32_t index = s->num_primitive_matrices - mat; | |
845 | index = (i * (index * 2 + 1) + index) & (m->access_unit_size_pow2 - 1); | |
846 | accum += m->noise_buffer[index] << (matrix_noise_shift + 7); | |
847 | } | |
848 | m->sample_buffer[i][dest_ch] = ((accum >> 14) & mask) | |
849 | + m->bypassed_lsbs[i][mat]; | |
850 | } | |
851 | } | |
852 | } | |
853 | ||
854 | /** Write the audio data into the output buffer. */ | |
855 | ||
856 | static int output_data_internal(MLPDecodeContext *m, unsigned int substr, | |
857 | uint8_t *data, unsigned int *data_size, int is32) | |
858 | { | |
859 | SubStream *s = &m->substream[substr]; | |
9731e7f1 | 860 | unsigned int i, out_ch = 0; |
b517af05 RP |
861 | int32_t *data_32 = (int32_t*) data; |
862 | int16_t *data_16 = (int16_t*) data; | |
863 | ||
864 | if (*data_size < (s->max_channel + 1) * s->blockpos * (is32 ? 4 : 2)) | |
865 | return -1; | |
866 | ||
867 | for (i = 0; i < s->blockpos; i++) { | |
9731e7f1 RP |
868 | for (out_ch = 0; out_ch <= s->max_matrix_channel; out_ch++) { |
869 | int mat_ch = s->ch_assign[out_ch]; | |
870 | int32_t sample = m->sample_buffer[i][mat_ch] | |
871 | << s->output_shift[mat_ch]; | |
872 | s->lossless_check_data ^= (sample & 0xffffff) << mat_ch; | |
b517af05 RP |
873 | if (is32) *data_32++ = sample << 8; |
874 | else *data_16++ = sample >> 8; | |
875 | } | |
876 | } | |
877 | ||
9731e7f1 | 878 | *data_size = i * out_ch * (is32 ? 4 : 2); |
b517af05 RP |
879 | |
880 | return 0; | |
881 | } | |
882 | ||
883 | static int output_data(MLPDecodeContext *m, unsigned int substr, | |
884 | uint8_t *data, unsigned int *data_size) | |
885 | { | |
886 | if (m->avctx->sample_fmt == SAMPLE_FMT_S32) | |
887 | return output_data_internal(m, substr, data, data_size, 1); | |
888 | else | |
889 | return output_data_internal(m, substr, data, data_size, 0); | |
890 | } | |
891 | ||
892 | ||
b517af05 RP |
893 | /** Read an access unit from the stream. |
894 | * Returns < 0 on error, 0 if not enough data is present in the input stream | |
895 | * otherwise returns the number of bytes consumed. */ | |
896 | ||
897 | static int read_access_unit(AVCodecContext *avctx, void* data, int *data_size, | |
898 | const uint8_t *buf, int buf_size) | |
899 | { | |
900 | MLPDecodeContext *m = avctx->priv_data; | |
901 | GetBitContext gb; | |
902 | unsigned int length, substr; | |
903 | unsigned int substream_start; | |
904 | unsigned int header_size = 4; | |
905 | unsigned int substr_header_size = 0; | |
906 | uint8_t substream_parity_present[MAX_SUBSTREAMS]; | |
907 | uint16_t substream_data_len[MAX_SUBSTREAMS]; | |
908 | uint8_t parity_bits; | |
909 | ||
910 | if (buf_size < 4) | |
911 | return 0; | |
912 | ||
913 | length = (AV_RB16(buf) & 0xfff) * 2; | |
914 | ||
915 | if (length > buf_size) | |
916 | return -1; | |
917 | ||
918 | init_get_bits(&gb, (buf + 4), (length - 4) * 8); | |
919 | ||
920 | if (show_bits_long(&gb, 31) == (0xf8726fba >> 1)) { | |
b517af05 RP |
921 | if (read_major_sync(m, &gb) < 0) |
922 | goto error; | |
923 | header_size += 28; | |
924 | } | |
925 | ||
926 | if (!m->params_valid) { | |
927 | av_log(m->avctx, AV_LOG_WARNING, | |
9906a2be | 928 | "Stream parameters not seen; skipping frame.\n"); |
b517af05 RP |
929 | *data_size = 0; |
930 | return length; | |
931 | } | |
932 | ||
933 | substream_start = 0; | |
934 | ||
935 | for (substr = 0; substr < m->num_substreams; substr++) { | |
936 | int extraword_present, checkdata_present, end; | |
937 | ||
938 | extraword_present = get_bits1(&gb); | |
939 | skip_bits1(&gb); | |
940 | checkdata_present = get_bits1(&gb); | |
941 | skip_bits1(&gb); | |
942 | ||
943 | end = get_bits(&gb, 12) * 2; | |
944 | ||
945 | substr_header_size += 2; | |
946 | ||
947 | if (extraword_present) { | |
948 | skip_bits(&gb, 16); | |
949 | substr_header_size += 2; | |
950 | } | |
951 | ||
952 | if (end + header_size + substr_header_size > length) { | |
953 | av_log(m->avctx, AV_LOG_ERROR, | |
954 | "Indicated length of substream %d data goes off end of " | |
955 | "packet.\n", substr); | |
956 | end = length - header_size - substr_header_size; | |
957 | } | |
958 | ||
959 | if (end < substream_start) { | |
960 | av_log(avctx, AV_LOG_ERROR, | |
961 | "Indicated end offset of substream %d data " | |
962 | "is smaller than calculated start offset.\n", | |
963 | substr); | |
964 | goto error; | |
965 | } | |
966 | ||
967 | if (substr > m->max_decoded_substream) | |
968 | continue; | |
969 | ||
970 | substream_parity_present[substr] = checkdata_present; | |
971 | substream_data_len[substr] = end - substream_start; | |
972 | substream_start = end; | |
973 | } | |
974 | ||
ce15710f RP |
975 | parity_bits = ff_mlp_calculate_parity(buf, 4); |
976 | parity_bits ^= ff_mlp_calculate_parity(buf + header_size, substr_header_size); | |
b517af05 RP |
977 | |
978 | if ((((parity_bits >> 4) ^ parity_bits) & 0xF) != 0xF) { | |
979 | av_log(avctx, AV_LOG_ERROR, "Parity check failed.\n"); | |
980 | goto error; | |
981 | } | |
982 | ||
983 | buf += header_size + substr_header_size; | |
984 | ||
985 | for (substr = 0; substr <= m->max_decoded_substream; substr++) { | |
986 | SubStream *s = &m->substream[substr]; | |
987 | init_get_bits(&gb, buf, substream_data_len[substr] * 8); | |
988 | ||
989 | s->blockpos = 0; | |
990 | do { | |
991 | if (get_bits1(&gb)) { | |
992 | if (get_bits1(&gb)) { | |
9906a2be | 993 | /* A restart header should be present. */ |
b517af05 RP |
994 | if (read_restart_header(m, &gb, buf, substr) < 0) |
995 | goto next_substr; | |
996 | s->restart_seen = 1; | |
997 | } | |
998 | ||
999 | if (!s->restart_seen) { | |
1000 | av_log(m->avctx, AV_LOG_ERROR, | |
1001 | "No restart header present in substream %d.\n", | |
1002 | substr); | |
1003 | goto next_substr; | |
1004 | } | |
1005 | ||
1006 | if (read_decoding_params(m, &gb, substr) < 0) | |
1007 | goto next_substr; | |
1008 | } | |
1009 | ||
1010 | if (!s->restart_seen) { | |
1011 | av_log(m->avctx, AV_LOG_ERROR, | |
1012 | "No restart header present in substream %d.\n", | |
1013 | substr); | |
1014 | goto next_substr; | |
1015 | } | |
1016 | ||
1017 | if (read_block_data(m, &gb, substr) < 0) | |
1018 | return -1; | |
1019 | ||
1020 | } while ((get_bits_count(&gb) < substream_data_len[substr] * 8) | |
1021 | && get_bits1(&gb) == 0); | |
1022 | ||
1023 | skip_bits(&gb, (-get_bits_count(&gb)) & 15); | |
7b18e13a RP |
1024 | if (substream_data_len[substr] * 8 - get_bits_count(&gb) >= 32) { |
1025 | int shorten_by; | |
1026 | ||
1027 | if (get_bits(&gb, 16) != 0xD234) | |
1028 | return -1; | |
1029 | ||
1030 | shorten_by = get_bits(&gb, 16); | |
1031 | if (m->avctx->codec_id == CODEC_ID_TRUEHD && shorten_by & 0x2000) | |
1032 | s->blockpos -= FFMIN(shorten_by & 0x1FFF, s->blockpos); | |
1033 | else if (m->avctx->codec_id == CODEC_ID_MLP && shorten_by != 0xD234) | |
1034 | return -1; | |
1035 | ||
b517af05 | 1036 | if (substr == m->max_decoded_substream) |
9906a2be | 1037 | av_log(m->avctx, AV_LOG_INFO, "End of stream indicated.\n"); |
b517af05 | 1038 | } |
eb2cd99c RP |
1039 | if (substream_data_len[substr] * 8 - get_bits_count(&gb) >= 16 && |
1040 | substream_parity_present[substr]) { | |
b517af05 RP |
1041 | uint8_t parity, checksum; |
1042 | ||
d544dcdf RP |
1043 | parity = ff_mlp_calculate_parity(buf, substream_data_len[substr] - 2); |
1044 | checksum = ff_mlp_checksum8 (buf, substream_data_len[substr] - 2); | |
b517af05 | 1045 | |
d544dcdf RP |
1046 | if ((get_bits(&gb, 8) ^ parity) != 0xa9 ) |
1047 | av_log(m->avctx, AV_LOG_ERROR, "Substream %d parity check failed.\n", substr); | |
1048 | if ( get_bits(&gb, 8) != checksum) | |
1049 | av_log(m->avctx, AV_LOG_ERROR, "Substream %d checksum failed.\n" , substr); | |
b517af05 RP |
1050 | } |
1051 | if (substream_data_len[substr] * 8 != get_bits_count(&gb)) { | |
9906a2be | 1052 | av_log(m->avctx, AV_LOG_ERROR, "substream %d length mismatch\n", |
b517af05 RP |
1053 | substr); |
1054 | return -1; | |
1055 | } | |
1056 | ||
1057 | next_substr: | |
1058 | buf += substream_data_len[substr]; | |
1059 | } | |
1060 | ||
1061 | rematrix_channels(m, m->max_decoded_substream); | |
1062 | ||
1063 | if (output_data(m, m->max_decoded_substream, data, data_size) < 0) | |
1064 | return -1; | |
1065 | ||
1066 | return length; | |
1067 | ||
1068 | error: | |
1069 | m->params_valid = 0; | |
1070 | return -1; | |
1071 | } | |
1072 | ||
9ba4821d | 1073 | #if CONFIG_MLP_DECODER |
b517af05 RP |
1074 | AVCodec mlp_decoder = { |
1075 | "mlp", | |
1076 | CODEC_TYPE_AUDIO, | |
1077 | CODEC_ID_MLP, | |
1078 | sizeof(MLPDecodeContext), | |
1079 | mlp_decode_init, | |
1080 | NULL, | |
1081 | NULL, | |
1082 | read_access_unit, | |
9ba4821d | 1083 | .long_name = NULL_IF_CONFIG_SMALL("MLP (Meridian Lossless Packing)"), |
b517af05 | 1084 | }; |
9ba4821d | 1085 | #endif /* CONFIG_MLP_DECODER */ |
b517af05 | 1086 | |
9ba4821d RP |
1087 | #if CONFIG_TRUEHD_DECODER |
1088 | AVCodec truehd_decoder = { | |
1089 | "truehd", | |
1090 | CODEC_TYPE_AUDIO, | |
1091 | CODEC_ID_TRUEHD, | |
1092 | sizeof(MLPDecodeContext), | |
1093 | mlp_decode_init, | |
1094 | NULL, | |
1095 | NULL, | |
1096 | read_access_unit, | |
1097 | .long_name = NULL_IF_CONFIG_SMALL("TrueHD"), | |
1098 | }; | |
1099 | #endif /* CONFIG_TRUEHD_DECODER */ |