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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 | /** | |
23 | * @file | |
24 | * MLP decoder | |
25 | */ | |
26 | ||
27 | #include <stdint.h> | |
28 | ||
29 | #include "avcodec.h" | |
30 | #include "libavutil/internal.h" | |
31 | #include "libavutil/intreadwrite.h" | |
32 | #include "libavutil/channel_layout.h" | |
33 | #include "get_bits.h" | |
34 | #include "internal.h" | |
35 | #include "libavutil/crc.h" | |
36 | #include "parser.h" | |
37 | #include "mlp_parser.h" | |
38 | #include "mlpdsp.h" | |
39 | #include "mlp.h" | |
40 | #include "config.h" | |
41 | ||
42 | /** number of bits used for VLC lookup - longest Huffman code is 9 */ | |
43 | #if ARCH_ARM | |
44 | #define VLC_BITS 5 | |
45 | #define VLC_STATIC_SIZE 64 | |
46 | #else | |
47 | #define VLC_BITS 9 | |
48 | #define VLC_STATIC_SIZE 512 | |
49 | #endif | |
50 | ||
51 | typedef struct SubStream { | |
52 | /// Set if a valid restart header has been read. Otherwise the substream cannot be decoded. | |
53 | uint8_t restart_seen; | |
54 | ||
55 | //@{ | |
56 | /** restart header data */ | |
57 | /// The type of noise to be used in the rematrix stage. | |
58 | uint16_t noise_type; | |
59 | ||
60 | /// The index of the first channel coded in this substream. | |
61 | uint8_t min_channel; | |
62 | /// The index of the last channel coded in this substream. | |
63 | uint8_t max_channel; | |
64 | /// The number of channels input into the rematrix stage. | |
65 | uint8_t max_matrix_channel; | |
66 | /// For each channel output by the matrix, the output channel to map it to | |
67 | uint8_t ch_assign[MAX_CHANNELS]; | |
68 | /// The channel layout for this substream | |
69 | uint64_t ch_layout; | |
70 | /// The matrix encoding mode for this substream | |
71 | enum AVMatrixEncoding matrix_encoding; | |
72 | ||
73 | /// Channel coding parameters for channels in the substream | |
74 | ChannelParams channel_params[MAX_CHANNELS]; | |
75 | ||
76 | /// The left shift applied to random noise in 0x31ea substreams. | |
77 | uint8_t noise_shift; | |
78 | /// The current seed value for the pseudorandom noise generator(s). | |
79 | uint32_t noisegen_seed; | |
80 | ||
81 | /// Set if the substream contains extra info to check the size of VLC blocks. | |
82 | uint8_t data_check_present; | |
83 | ||
84 | /// Bitmask of which parameter sets are conveyed in a decoding parameter block. | |
85 | uint8_t param_presence_flags; | |
86 | #define PARAM_BLOCKSIZE (1 << 7) | |
87 | #define PARAM_MATRIX (1 << 6) | |
88 | #define PARAM_OUTSHIFT (1 << 5) | |
89 | #define PARAM_QUANTSTEP (1 << 4) | |
90 | #define PARAM_FIR (1 << 3) | |
91 | #define PARAM_IIR (1 << 2) | |
92 | #define PARAM_HUFFOFFSET (1 << 1) | |
93 | #define PARAM_PRESENCE (1 << 0) | |
94 | //@} | |
95 | ||
96 | //@{ | |
97 | /** matrix data */ | |
98 | ||
99 | /// Number of matrices to be applied. | |
100 | uint8_t num_primitive_matrices; | |
101 | ||
102 | /// matrix output channel | |
103 | uint8_t matrix_out_ch[MAX_MATRICES]; | |
104 | ||
105 | /// Whether the LSBs of the matrix output are encoded in the bitstream. | |
106 | uint8_t lsb_bypass[MAX_MATRICES]; | |
107 | /// Matrix coefficients, stored as 2.14 fixed point. | |
108 | int32_t matrix_coeff[MAX_MATRICES][MAX_CHANNELS]; | |
109 | /// Left shift to apply to noise values in 0x31eb substreams. | |
110 | uint8_t matrix_noise_shift[MAX_MATRICES]; | |
111 | //@} | |
112 | ||
113 | /// Left shift to apply to Huffman-decoded residuals. | |
114 | uint8_t quant_step_size[MAX_CHANNELS]; | |
115 | ||
116 | /// number of PCM samples in current audio block | |
117 | uint16_t blocksize; | |
118 | /// Number of PCM samples decoded so far in this frame. | |
119 | uint16_t blockpos; | |
120 | ||
121 | /// Left shift to apply to decoded PCM values to get final 24-bit output. | |
122 | int8_t output_shift[MAX_CHANNELS]; | |
123 | ||
124 | /// Running XOR of all output samples. | |
125 | int32_t lossless_check_data; | |
126 | ||
127 | } SubStream; | |
128 | ||
129 | typedef struct MLPDecodeContext { | |
130 | AVCodecContext *avctx; | |
131 | ||
132 | /// Current access unit being read has a major sync. | |
133 | int is_major_sync_unit; | |
134 | ||
135 | /// Set if a valid major sync block has been read. Otherwise no decoding is possible. | |
136 | uint8_t params_valid; | |
137 | ||
138 | /// Number of substreams contained within this stream. | |
139 | uint8_t num_substreams; | |
140 | ||
141 | /// Index of the last substream to decode - further substreams are skipped. | |
142 | uint8_t max_decoded_substream; | |
143 | ||
144 | /// Stream needs channel reordering to comply with FFmpeg's channel order | |
145 | uint8_t needs_reordering; | |
146 | ||
147 | /// number of PCM samples contained in each frame | |
148 | int access_unit_size; | |
149 | /// next power of two above the number of samples in each frame | |
150 | int access_unit_size_pow2; | |
151 | ||
152 | SubStream substream[MAX_SUBSTREAMS]; | |
153 | ||
154 | int matrix_changed; | |
155 | int filter_changed[MAX_CHANNELS][NUM_FILTERS]; | |
156 | ||
157 | int8_t noise_buffer[MAX_BLOCKSIZE_POW2]; | |
158 | int8_t bypassed_lsbs[MAX_BLOCKSIZE][MAX_CHANNELS]; | |
159 | int32_t sample_buffer[MAX_BLOCKSIZE][MAX_CHANNELS]; | |
160 | ||
161 | MLPDSPContext dsp; | |
162 | } MLPDecodeContext; | |
163 | ||
164 | static const uint64_t thd_channel_order[] = { | |
165 | AV_CH_FRONT_LEFT, AV_CH_FRONT_RIGHT, // LR | |
166 | AV_CH_FRONT_CENTER, // C | |
167 | AV_CH_LOW_FREQUENCY, // LFE | |
168 | AV_CH_SIDE_LEFT, AV_CH_SIDE_RIGHT, // LRs | |
169 | AV_CH_TOP_FRONT_LEFT, AV_CH_TOP_FRONT_RIGHT, // LRvh | |
170 | AV_CH_FRONT_LEFT_OF_CENTER, AV_CH_FRONT_RIGHT_OF_CENTER, // LRc | |
171 | AV_CH_BACK_LEFT, AV_CH_BACK_RIGHT, // LRrs | |
172 | AV_CH_BACK_CENTER, // Cs | |
173 | AV_CH_TOP_CENTER, // Ts | |
174 | AV_CH_SURROUND_DIRECT_LEFT, AV_CH_SURROUND_DIRECT_RIGHT, // LRsd | |
175 | AV_CH_WIDE_LEFT, AV_CH_WIDE_RIGHT, // LRw | |
176 | AV_CH_TOP_FRONT_CENTER, // Cvh | |
177 | AV_CH_LOW_FREQUENCY_2, // LFE2 | |
178 | }; | |
179 | ||
180 | static uint64_t thd_channel_layout_extract_channel(uint64_t channel_layout, | |
181 | int index) | |
182 | { | |
183 | int i; | |
184 | ||
185 | if (av_get_channel_layout_nb_channels(channel_layout) <= index) | |
186 | return 0; | |
187 | ||
188 | for (i = 0; i < FF_ARRAY_ELEMS(thd_channel_order); i++) | |
189 | if (channel_layout & thd_channel_order[i] && !index--) | |
190 | return thd_channel_order[i]; | |
191 | return 0; | |
192 | } | |
193 | ||
194 | static VLC huff_vlc[3]; | |
195 | ||
196 | /** Initialize static data, constant between all invocations of the codec. */ | |
197 | ||
198 | static av_cold void init_static(void) | |
199 | { | |
200 | if (!huff_vlc[0].bits) { | |
201 | INIT_VLC_STATIC(&huff_vlc[0], VLC_BITS, 18, | |
202 | &ff_mlp_huffman_tables[0][0][1], 2, 1, | |
203 | &ff_mlp_huffman_tables[0][0][0], 2, 1, VLC_STATIC_SIZE); | |
204 | INIT_VLC_STATIC(&huff_vlc[1], VLC_BITS, 16, | |
205 | &ff_mlp_huffman_tables[1][0][1], 2, 1, | |
206 | &ff_mlp_huffman_tables[1][0][0], 2, 1, VLC_STATIC_SIZE); | |
207 | INIT_VLC_STATIC(&huff_vlc[2], VLC_BITS, 15, | |
208 | &ff_mlp_huffman_tables[2][0][1], 2, 1, | |
209 | &ff_mlp_huffman_tables[2][0][0], 2, 1, VLC_STATIC_SIZE); | |
210 | } | |
211 | ||
212 | ff_mlp_init_crc(); | |
213 | } | |
214 | ||
215 | static inline int32_t calculate_sign_huff(MLPDecodeContext *m, | |
216 | unsigned int substr, unsigned int ch) | |
217 | { | |
218 | SubStream *s = &m->substream[substr]; | |
219 | ChannelParams *cp = &s->channel_params[ch]; | |
220 | int lsb_bits = cp->huff_lsbs - s->quant_step_size[ch]; | |
221 | int sign_shift = lsb_bits + (cp->codebook ? 2 - cp->codebook : -1); | |
222 | int32_t sign_huff_offset = cp->huff_offset; | |
223 | ||
224 | if (cp->codebook > 0) | |
225 | sign_huff_offset -= 7 << lsb_bits; | |
226 | ||
227 | if (sign_shift >= 0) | |
228 | sign_huff_offset -= 1 << sign_shift; | |
229 | ||
230 | return sign_huff_offset; | |
231 | } | |
232 | ||
233 | /** Read a sample, consisting of either, both or neither of entropy-coded MSBs | |
234 | * and plain LSBs. */ | |
235 | ||
236 | static inline int read_huff_channels(MLPDecodeContext *m, GetBitContext *gbp, | |
237 | unsigned int substr, unsigned int pos) | |
238 | { | |
239 | SubStream *s = &m->substream[substr]; | |
240 | unsigned int mat, channel; | |
241 | ||
242 | for (mat = 0; mat < s->num_primitive_matrices; mat++) | |
243 | if (s->lsb_bypass[mat]) | |
244 | m->bypassed_lsbs[pos + s->blockpos][mat] = get_bits1(gbp); | |
245 | ||
246 | for (channel = s->min_channel; channel <= s->max_channel; channel++) { | |
247 | ChannelParams *cp = &s->channel_params[channel]; | |
248 | int codebook = cp->codebook; | |
249 | int quant_step_size = s->quant_step_size[channel]; | |
250 | int lsb_bits = cp->huff_lsbs - quant_step_size; | |
251 | int result = 0; | |
252 | ||
253 | if (codebook > 0) | |
254 | result = get_vlc2(gbp, huff_vlc[codebook-1].table, | |
255 | VLC_BITS, (9 + VLC_BITS - 1) / VLC_BITS); | |
256 | ||
257 | if (result < 0) | |
258 | return AVERROR_INVALIDDATA; | |
259 | ||
260 | if (lsb_bits > 0) | |
261 | result = (result << lsb_bits) + get_bits(gbp, lsb_bits); | |
262 | ||
263 | result += cp->sign_huff_offset; | |
264 | result <<= quant_step_size; | |
265 | ||
266 | m->sample_buffer[pos + s->blockpos][channel] = result; | |
267 | } | |
268 | ||
269 | return 0; | |
270 | } | |
271 | ||
272 | static av_cold int mlp_decode_init(AVCodecContext *avctx) | |
273 | { | |
274 | MLPDecodeContext *m = avctx->priv_data; | |
275 | int substr; | |
276 | ||
277 | init_static(); | |
278 | m->avctx = avctx; | |
279 | for (substr = 0; substr < MAX_SUBSTREAMS; substr++) | |
280 | m->substream[substr].lossless_check_data = 0xffffffff; | |
281 | ff_mlpdsp_init(&m->dsp); | |
282 | ||
283 | return 0; | |
284 | } | |
285 | ||
286 | /** Read a major sync info header - contains high level information about | |
287 | * the stream - sample rate, channel arrangement etc. Most of this | |
288 | * information is not actually necessary for decoding, only for playback. | |
289 | */ | |
290 | ||
291 | static int read_major_sync(MLPDecodeContext *m, GetBitContext *gb) | |
292 | { | |
293 | MLPHeaderInfo mh; | |
294 | int substr, ret; | |
295 | ||
296 | if ((ret = ff_mlp_read_major_sync(m->avctx, &mh, gb)) != 0) | |
297 | return ret; | |
298 | ||
299 | if (mh.group1_bits == 0) { | |
300 | av_log(m->avctx, AV_LOG_ERROR, "invalid/unknown bits per sample\n"); | |
301 | return AVERROR_INVALIDDATA; | |
302 | } | |
303 | if (mh.group2_bits > mh.group1_bits) { | |
304 | av_log(m->avctx, AV_LOG_ERROR, | |
305 | "Channel group 2 cannot have more bits per sample than group 1.\n"); | |
306 | return AVERROR_INVALIDDATA; | |
307 | } | |
308 | ||
309 | if (mh.group2_samplerate && mh.group2_samplerate != mh.group1_samplerate) { | |
310 | av_log(m->avctx, AV_LOG_ERROR, | |
311 | "Channel groups with differing sample rates are not currently supported.\n"); | |
312 | return AVERROR_INVALIDDATA; | |
313 | } | |
314 | ||
315 | if (mh.group1_samplerate == 0) { | |
316 | av_log(m->avctx, AV_LOG_ERROR, "invalid/unknown sampling rate\n"); | |
317 | return AVERROR_INVALIDDATA; | |
318 | } | |
319 | if (mh.group1_samplerate > MAX_SAMPLERATE) { | |
320 | av_log(m->avctx, AV_LOG_ERROR, | |
321 | "Sampling rate %d is greater than the supported maximum (%d).\n", | |
322 | mh.group1_samplerate, MAX_SAMPLERATE); | |
323 | return AVERROR_INVALIDDATA; | |
324 | } | |
325 | if (mh.access_unit_size > MAX_BLOCKSIZE) { | |
326 | av_log(m->avctx, AV_LOG_ERROR, | |
327 | "Block size %d is greater than the supported maximum (%d).\n", | |
328 | mh.access_unit_size, MAX_BLOCKSIZE); | |
329 | return AVERROR_INVALIDDATA; | |
330 | } | |
331 | if (mh.access_unit_size_pow2 > MAX_BLOCKSIZE_POW2) { | |
332 | av_log(m->avctx, AV_LOG_ERROR, | |
333 | "Block size pow2 %d is greater than the supported maximum (%d).\n", | |
334 | mh.access_unit_size_pow2, MAX_BLOCKSIZE_POW2); | |
335 | return AVERROR_INVALIDDATA; | |
336 | } | |
337 | ||
338 | if (mh.num_substreams == 0) | |
339 | return AVERROR_INVALIDDATA; | |
340 | if (m->avctx->codec_id == AV_CODEC_ID_MLP && mh.num_substreams > 2) { | |
341 | av_log(m->avctx, AV_LOG_ERROR, "MLP only supports up to 2 substreams.\n"); | |
342 | return AVERROR_INVALIDDATA; | |
343 | } | |
344 | if (mh.num_substreams > MAX_SUBSTREAMS) { | |
345 | avpriv_request_sample(m->avctx, | |
346 | "%d substreams (more than the " | |
347 | "maximum supported by the decoder)", | |
348 | mh.num_substreams); | |
349 | return AVERROR_PATCHWELCOME; | |
350 | } | |
351 | ||
352 | m->access_unit_size = mh.access_unit_size; | |
353 | m->access_unit_size_pow2 = mh.access_unit_size_pow2; | |
354 | ||
355 | m->num_substreams = mh.num_substreams; | |
356 | m->max_decoded_substream = m->num_substreams - 1; | |
357 | ||
358 | m->avctx->sample_rate = mh.group1_samplerate; | |
359 | m->avctx->frame_size = mh.access_unit_size; | |
360 | ||
361 | m->avctx->bits_per_raw_sample = mh.group1_bits; | |
362 | if (mh.group1_bits > 16) | |
363 | m->avctx->sample_fmt = AV_SAMPLE_FMT_S32; | |
364 | else | |
365 | m->avctx->sample_fmt = AV_SAMPLE_FMT_S16; | |
366 | m->dsp.mlp_pack_output = m->dsp.mlp_select_pack_output(m->substream[m->max_decoded_substream].ch_assign, | |
367 | m->substream[m->max_decoded_substream].output_shift, | |
368 | m->substream[m->max_decoded_substream].max_matrix_channel, | |
369 | m->avctx->sample_fmt == AV_SAMPLE_FMT_S32); | |
370 | ||
371 | m->params_valid = 1; | |
372 | for (substr = 0; substr < MAX_SUBSTREAMS; substr++) | |
373 | m->substream[substr].restart_seen = 0; | |
374 | ||
375 | /* Set the layout for each substream. When there's more than one, the first | |
376 | * substream is Stereo. Subsequent substreams' layouts are indicated in the | |
377 | * major sync. */ | |
378 | if (m->avctx->codec_id == AV_CODEC_ID_MLP) { | |
379 | if (mh.stream_type != 0xbb) { | |
380 | avpriv_request_sample(m->avctx, | |
381 | "unexpected stream_type %X in MLP", | |
382 | mh.stream_type); | |
383 | return AVERROR_PATCHWELCOME; | |
384 | } | |
385 | if ((substr = (mh.num_substreams > 1))) | |
386 | m->substream[0].ch_layout = AV_CH_LAYOUT_STEREO; | |
387 | m->substream[substr].ch_layout = mh.channel_layout_mlp; | |
388 | } else { | |
389 | if (mh.stream_type != 0xba) { | |
390 | avpriv_request_sample(m->avctx, | |
391 | "unexpected stream_type %X in !MLP", | |
392 | mh.stream_type); | |
393 | return AVERROR_PATCHWELCOME; | |
394 | } | |
395 | if ((substr = (mh.num_substreams > 1))) | |
396 | m->substream[0].ch_layout = AV_CH_LAYOUT_STEREO; | |
397 | if (mh.num_substreams > 2) | |
398 | if (mh.channel_layout_thd_stream2) | |
399 | m->substream[2].ch_layout = mh.channel_layout_thd_stream2; | |
400 | else | |
401 | m->substream[2].ch_layout = mh.channel_layout_thd_stream1; | |
402 | m->substream[substr].ch_layout = mh.channel_layout_thd_stream1; | |
403 | ||
404 | if (m->avctx->channels<=2 && m->substream[substr].ch_layout == AV_CH_LAYOUT_MONO && m->max_decoded_substream == 1) { | |
405 | av_log(m->avctx, AV_LOG_DEBUG, "Mono stream with 2 substreams, ignoring 2nd\n"); | |
406 | m->max_decoded_substream = 0; | |
407 | if (m->avctx->channels==2) | |
408 | m->avctx->channel_layout = AV_CH_LAYOUT_STEREO; | |
409 | } | |
410 | } | |
411 | ||
412 | m->needs_reordering = mh.channel_arrangement >= 18 && mh.channel_arrangement <= 20; | |
413 | ||
414 | /* Parse the TrueHD decoder channel modifiers and set each substream's | |
415 | * AVMatrixEncoding accordingly. | |
416 | * | |
417 | * The meaning of the modifiers depends on the channel layout: | |
418 | * | |
419 | * - THD_CH_MODIFIER_LTRT, THD_CH_MODIFIER_LBINRBIN only apply to 2-channel | |
420 | * | |
421 | * - THD_CH_MODIFIER_MONO applies to 1-channel or 2-channel (dual mono) | |
422 | * | |
423 | * - THD_CH_MODIFIER_SURROUNDEX, THD_CH_MODIFIER_NOTSURROUNDEX only apply to | |
424 | * layouts with an Ls/Rs channel pair | |
425 | */ | |
426 | for (substr = 0; substr < MAX_SUBSTREAMS; substr++) | |
427 | m->substream[substr].matrix_encoding = AV_MATRIX_ENCODING_NONE; | |
428 | if (m->avctx->codec_id == AV_CODEC_ID_TRUEHD) { | |
429 | if (mh.num_substreams > 2 && | |
430 | mh.channel_layout_thd_stream2 & AV_CH_SIDE_LEFT && | |
431 | mh.channel_layout_thd_stream2 & AV_CH_SIDE_RIGHT && | |
432 | mh.channel_modifier_thd_stream2 == THD_CH_MODIFIER_SURROUNDEX) | |
433 | m->substream[2].matrix_encoding = AV_MATRIX_ENCODING_DOLBYEX; | |
434 | ||
435 | if (mh.num_substreams > 1 && | |
436 | mh.channel_layout_thd_stream1 & AV_CH_SIDE_LEFT && | |
437 | mh.channel_layout_thd_stream1 & AV_CH_SIDE_RIGHT && | |
438 | mh.channel_modifier_thd_stream1 == THD_CH_MODIFIER_SURROUNDEX) | |
439 | m->substream[1].matrix_encoding = AV_MATRIX_ENCODING_DOLBYEX; | |
440 | ||
441 | if (mh.num_substreams > 0) | |
442 | switch (mh.channel_modifier_thd_stream0) { | |
443 | case THD_CH_MODIFIER_LTRT: | |
444 | m->substream[0].matrix_encoding = AV_MATRIX_ENCODING_DOLBY; | |
445 | break; | |
446 | case THD_CH_MODIFIER_LBINRBIN: | |
447 | m->substream[0].matrix_encoding = AV_MATRIX_ENCODING_DOLBYHEADPHONE; | |
448 | break; | |
449 | default: | |
450 | break; | |
451 | } | |
452 | } | |
453 | ||
454 | return 0; | |
455 | } | |
456 | ||
457 | /** Read a restart header from a block in a substream. This contains parameters | |
458 | * required to decode the audio that do not change very often. Generally | |
459 | * (always) present only in blocks following a major sync. */ | |
460 | ||
461 | static int read_restart_header(MLPDecodeContext *m, GetBitContext *gbp, | |
462 | const uint8_t *buf, unsigned int substr) | |
463 | { | |
464 | SubStream *s = &m->substream[substr]; | |
465 | unsigned int ch; | |
466 | int sync_word, tmp; | |
467 | uint8_t checksum; | |
468 | uint8_t lossless_check; | |
469 | int start_count = get_bits_count(gbp); | |
470 | int min_channel, max_channel, max_matrix_channel; | |
471 | const int std_max_matrix_channel = m->avctx->codec_id == AV_CODEC_ID_MLP | |
472 | ? MAX_MATRIX_CHANNEL_MLP | |
473 | : MAX_MATRIX_CHANNEL_TRUEHD; | |
474 | ||
475 | sync_word = get_bits(gbp, 13); | |
476 | ||
477 | if (sync_word != 0x31ea >> 1) { | |
478 | av_log(m->avctx, AV_LOG_ERROR, | |
479 | "restart header sync incorrect (got 0x%04x)\n", sync_word); | |
480 | return AVERROR_INVALIDDATA; | |
481 | } | |
482 | ||
483 | s->noise_type = get_bits1(gbp); | |
484 | ||
485 | if (m->avctx->codec_id == AV_CODEC_ID_MLP && s->noise_type) { | |
486 | av_log(m->avctx, AV_LOG_ERROR, "MLP must have 0x31ea sync word.\n"); | |
487 | return AVERROR_INVALIDDATA; | |
488 | } | |
489 | ||
490 | skip_bits(gbp, 16); /* Output timestamp */ | |
491 | ||
492 | min_channel = get_bits(gbp, 4); | |
493 | max_channel = get_bits(gbp, 4); | |
494 | max_matrix_channel = get_bits(gbp, 4); | |
495 | ||
496 | if (max_matrix_channel > std_max_matrix_channel) { | |
497 | av_log(m->avctx, AV_LOG_ERROR, | |
498 | "Max matrix channel cannot be greater than %d.\n", | |
499 | std_max_matrix_channel); | |
500 | return AVERROR_INVALIDDATA; | |
501 | } | |
502 | ||
503 | if (max_channel != max_matrix_channel) { | |
504 | av_log(m->avctx, AV_LOG_ERROR, | |
505 | "Max channel must be equal max matrix channel.\n"); | |
506 | return AVERROR_INVALIDDATA; | |
507 | } | |
508 | ||
509 | /* This should happen for TrueHD streams with >6 channels and MLP's noise | |
510 | * type. It is not yet known if this is allowed. */ | |
511 | if (max_channel > MAX_MATRIX_CHANNEL_MLP && !s->noise_type) { | |
512 | avpriv_request_sample(m->avctx, | |
513 | "%d channels (more than the " | |
514 | "maximum supported by the decoder)", | |
515 | max_channel + 2); | |
516 | return AVERROR_PATCHWELCOME; | |
517 | } | |
518 | ||
519 | if (min_channel > max_channel) { | |
520 | av_log(m->avctx, AV_LOG_ERROR, | |
521 | "Substream min channel cannot be greater than max channel.\n"); | |
522 | return AVERROR_INVALIDDATA; | |
523 | } | |
524 | ||
525 | s->min_channel = min_channel; | |
526 | s->max_channel = max_channel; | |
527 | s->max_matrix_channel = max_matrix_channel; | |
528 | ||
529 | #if FF_API_REQUEST_CHANNELS | |
530 | FF_DISABLE_DEPRECATION_WARNINGS | |
531 | if (m->avctx->request_channels > 0 && | |
532 | m->avctx->request_channels <= s->max_channel + 1 && | |
533 | m->max_decoded_substream > substr) { | |
534 | av_log(m->avctx, AV_LOG_DEBUG, | |
535 | "Extracting %d-channel downmix from substream %d. " | |
536 | "Further substreams will be skipped.\n", | |
537 | s->max_channel + 1, substr); | |
538 | m->max_decoded_substream = substr; | |
539 | FF_ENABLE_DEPRECATION_WARNINGS | |
540 | } else | |
541 | #endif | |
542 | if (m->avctx->request_channel_layout && (s->ch_layout & m->avctx->request_channel_layout) == | |
543 | m->avctx->request_channel_layout && m->max_decoded_substream > substr) { | |
544 | av_log(m->avctx, AV_LOG_DEBUG, | |
545 | "Extracting %d-channel downmix (0x%"PRIx64") from substream %d. " | |
546 | "Further substreams will be skipped.\n", | |
547 | s->max_channel + 1, s->ch_layout, substr); | |
548 | m->max_decoded_substream = substr; | |
549 | } | |
550 | ||
551 | s->noise_shift = get_bits(gbp, 4); | |
552 | s->noisegen_seed = get_bits(gbp, 23); | |
553 | ||
554 | skip_bits(gbp, 19); | |
555 | ||
556 | s->data_check_present = get_bits1(gbp); | |
557 | lossless_check = get_bits(gbp, 8); | |
558 | if (substr == m->max_decoded_substream | |
559 | && s->lossless_check_data != 0xffffffff) { | |
560 | tmp = xor_32_to_8(s->lossless_check_data); | |
561 | if (tmp != lossless_check) | |
562 | av_log(m->avctx, AV_LOG_WARNING, | |
563 | "Lossless check failed - expected %02x, calculated %02x.\n", | |
564 | lossless_check, tmp); | |
565 | } | |
566 | ||
567 | skip_bits(gbp, 16); | |
568 | ||
569 | memset(s->ch_assign, 0, sizeof(s->ch_assign)); | |
570 | ||
571 | for (ch = 0; ch <= s->max_matrix_channel; ch++) { | |
572 | int ch_assign = get_bits(gbp, 6); | |
573 | if (m->avctx->codec_id == AV_CODEC_ID_TRUEHD) { | |
574 | uint64_t channel = thd_channel_layout_extract_channel(s->ch_layout, | |
575 | ch_assign); | |
576 | ch_assign = av_get_channel_layout_channel_index(s->ch_layout, | |
577 | channel); | |
578 | } | |
579 | if ((unsigned)ch_assign > s->max_matrix_channel) { | |
580 | avpriv_request_sample(m->avctx, | |
581 | "Assignment of matrix channel %d to invalid output channel %d", | |
582 | ch, ch_assign); | |
583 | return AVERROR_PATCHWELCOME; | |
584 | } | |
585 | s->ch_assign[ch_assign] = ch; | |
586 | } | |
587 | ||
588 | checksum = ff_mlp_restart_checksum(buf, get_bits_count(gbp) - start_count); | |
589 | ||
590 | if (checksum != get_bits(gbp, 8)) | |
591 | av_log(m->avctx, AV_LOG_ERROR, "restart header checksum error\n"); | |
592 | ||
593 | /* Set default decoding parameters. */ | |
594 | s->param_presence_flags = 0xff; | |
595 | s->num_primitive_matrices = 0; | |
596 | s->blocksize = 8; | |
597 | s->lossless_check_data = 0; | |
598 | ||
599 | memset(s->output_shift , 0, sizeof(s->output_shift )); | |
600 | memset(s->quant_step_size, 0, sizeof(s->quant_step_size)); | |
601 | ||
602 | for (ch = s->min_channel; ch <= s->max_channel; ch++) { | |
603 | ChannelParams *cp = &s->channel_params[ch]; | |
604 | cp->filter_params[FIR].order = 0; | |
605 | cp->filter_params[IIR].order = 0; | |
606 | cp->filter_params[FIR].shift = 0; | |
607 | cp->filter_params[IIR].shift = 0; | |
608 | ||
609 | /* Default audio coding is 24-bit raw PCM. */ | |
610 | cp->huff_offset = 0; | |
611 | cp->sign_huff_offset = (-1) << 23; | |
612 | cp->codebook = 0; | |
613 | cp->huff_lsbs = 24; | |
614 | } | |
615 | ||
616 | if (substr == m->max_decoded_substream) { | |
617 | m->avctx->channels = s->max_matrix_channel + 1; | |
618 | m->avctx->channel_layout = s->ch_layout; | |
619 | m->dsp.mlp_pack_output = m->dsp.mlp_select_pack_output(s->ch_assign, | |
620 | s->output_shift, | |
621 | s->max_matrix_channel, | |
622 | m->avctx->sample_fmt == AV_SAMPLE_FMT_S32); | |
623 | ||
624 | if (m->avctx->codec_id == AV_CODEC_ID_MLP && m->needs_reordering) { | |
625 | if (m->avctx->channel_layout == (AV_CH_LAYOUT_QUAD|AV_CH_LOW_FREQUENCY) || | |
626 | m->avctx->channel_layout == AV_CH_LAYOUT_5POINT0_BACK) { | |
627 | int i = s->ch_assign[4]; | |
628 | s->ch_assign[4] = s->ch_assign[3]; | |
629 | s->ch_assign[3] = s->ch_assign[2]; | |
630 | s->ch_assign[2] = i; | |
631 | } else if (m->avctx->channel_layout == AV_CH_LAYOUT_5POINT1_BACK) { | |
632 | FFSWAP(int, s->ch_assign[2], s->ch_assign[4]); | |
633 | FFSWAP(int, s->ch_assign[3], s->ch_assign[5]); | |
634 | } | |
635 | } | |
636 | ||
637 | } | |
638 | ||
639 | return 0; | |
640 | } | |
641 | ||
642 | /** Read parameters for one of the prediction filters. */ | |
643 | ||
644 | static int read_filter_params(MLPDecodeContext *m, GetBitContext *gbp, | |
645 | unsigned int substr, unsigned int channel, | |
646 | unsigned int filter) | |
647 | { | |
648 | SubStream *s = &m->substream[substr]; | |
649 | FilterParams *fp = &s->channel_params[channel].filter_params[filter]; | |
650 | const int max_order = filter ? MAX_IIR_ORDER : MAX_FIR_ORDER; | |
651 | const char fchar = filter ? 'I' : 'F'; | |
652 | int i, order; | |
653 | ||
654 | // Filter is 0 for FIR, 1 for IIR. | |
655 | av_assert0(filter < 2); | |
656 | ||
657 | if (m->filter_changed[channel][filter]++ > 1) { | |
658 | av_log(m->avctx, AV_LOG_ERROR, "Filters may change only once per access unit.\n"); | |
659 | return AVERROR_INVALIDDATA; | |
660 | } | |
661 | ||
662 | order = get_bits(gbp, 4); | |
663 | if (order > max_order) { | |
664 | av_log(m->avctx, AV_LOG_ERROR, | |
665 | "%cIR filter order %d is greater than maximum %d.\n", | |
666 | fchar, order, max_order); | |
667 | return AVERROR_INVALIDDATA; | |
668 | } | |
669 | fp->order = order; | |
670 | ||
671 | if (order > 0) { | |
672 | int32_t *fcoeff = s->channel_params[channel].coeff[filter]; | |
673 | int coeff_bits, coeff_shift; | |
674 | ||
675 | fp->shift = get_bits(gbp, 4); | |
676 | ||
677 | coeff_bits = get_bits(gbp, 5); | |
678 | coeff_shift = get_bits(gbp, 3); | |
679 | if (coeff_bits < 1 || coeff_bits > 16) { | |
680 | av_log(m->avctx, AV_LOG_ERROR, | |
681 | "%cIR filter coeff_bits must be between 1 and 16.\n", | |
682 | fchar); | |
683 | return AVERROR_INVALIDDATA; | |
684 | } | |
685 | if (coeff_bits + coeff_shift > 16) { | |
686 | av_log(m->avctx, AV_LOG_ERROR, | |
687 | "Sum of coeff_bits and coeff_shift for %cIR filter must be 16 or less.\n", | |
688 | fchar); | |
689 | return AVERROR_INVALIDDATA; | |
690 | } | |
691 | ||
692 | for (i = 0; i < order; i++) | |
693 | fcoeff[i] = get_sbits(gbp, coeff_bits) << coeff_shift; | |
694 | ||
695 | if (get_bits1(gbp)) { | |
696 | int state_bits, state_shift; | |
697 | ||
698 | if (filter == FIR) { | |
699 | av_log(m->avctx, AV_LOG_ERROR, | |
700 | "FIR filter has state data specified.\n"); | |
701 | return AVERROR_INVALIDDATA; | |
702 | } | |
703 | ||
704 | state_bits = get_bits(gbp, 4); | |
705 | state_shift = get_bits(gbp, 4); | |
706 | ||
707 | /* TODO: Check validity of state data. */ | |
708 | ||
709 | for (i = 0; i < order; i++) | |
710 | fp->state[i] = state_bits ? get_sbits(gbp, state_bits) << state_shift : 0; | |
711 | } | |
712 | } | |
713 | ||
714 | return 0; | |
715 | } | |
716 | ||
717 | /** Read parameters for primitive matrices. */ | |
718 | ||
719 | static int read_matrix_params(MLPDecodeContext *m, unsigned int substr, GetBitContext *gbp) | |
720 | { | |
721 | SubStream *s = &m->substream[substr]; | |
722 | unsigned int mat, ch; | |
723 | const int max_primitive_matrices = m->avctx->codec_id == AV_CODEC_ID_MLP | |
724 | ? MAX_MATRICES_MLP | |
725 | : MAX_MATRICES_TRUEHD; | |
726 | ||
727 | if (m->matrix_changed++ > 1) { | |
728 | av_log(m->avctx, AV_LOG_ERROR, "Matrices may change only once per access unit.\n"); | |
729 | return AVERROR_INVALIDDATA; | |
730 | } | |
731 | ||
732 | s->num_primitive_matrices = get_bits(gbp, 4); | |
733 | ||
734 | if (s->num_primitive_matrices > max_primitive_matrices) { | |
735 | av_log(m->avctx, AV_LOG_ERROR, | |
736 | "Number of primitive matrices cannot be greater than %d.\n", | |
737 | max_primitive_matrices); | |
738 | return AVERROR_INVALIDDATA; | |
739 | } | |
740 | ||
741 | for (mat = 0; mat < s->num_primitive_matrices; mat++) { | |
742 | int frac_bits, max_chan; | |
743 | s->matrix_out_ch[mat] = get_bits(gbp, 4); | |
744 | frac_bits = get_bits(gbp, 4); | |
745 | s->lsb_bypass [mat] = get_bits1(gbp); | |
746 | ||
747 | if (s->matrix_out_ch[mat] > s->max_matrix_channel) { | |
748 | av_log(m->avctx, AV_LOG_ERROR, | |
749 | "Invalid channel %d specified as output from matrix.\n", | |
750 | s->matrix_out_ch[mat]); | |
751 | return AVERROR_INVALIDDATA; | |
752 | } | |
753 | if (frac_bits > 14) { | |
754 | av_log(m->avctx, AV_LOG_ERROR, | |
755 | "Too many fractional bits specified.\n"); | |
756 | return AVERROR_INVALIDDATA; | |
757 | } | |
758 | ||
759 | max_chan = s->max_matrix_channel; | |
760 | if (!s->noise_type) | |
761 | max_chan+=2; | |
762 | ||
763 | for (ch = 0; ch <= max_chan; ch++) { | |
764 | int coeff_val = 0; | |
765 | if (get_bits1(gbp)) | |
766 | coeff_val = get_sbits(gbp, frac_bits + 2); | |
767 | ||
768 | s->matrix_coeff[mat][ch] = coeff_val << (14 - frac_bits); | |
769 | } | |
770 | ||
771 | if (s->noise_type) | |
772 | s->matrix_noise_shift[mat] = get_bits(gbp, 4); | |
773 | else | |
774 | s->matrix_noise_shift[mat] = 0; | |
775 | } | |
776 | ||
777 | return 0; | |
778 | } | |
779 | ||
780 | /** Read channel parameters. */ | |
781 | ||
782 | static int read_channel_params(MLPDecodeContext *m, unsigned int substr, | |
783 | GetBitContext *gbp, unsigned int ch) | |
784 | { | |
785 | SubStream *s = &m->substream[substr]; | |
786 | ChannelParams *cp = &s->channel_params[ch]; | |
787 | FilterParams *fir = &cp->filter_params[FIR]; | |
788 | FilterParams *iir = &cp->filter_params[IIR]; | |
789 | int ret; | |
790 | ||
791 | if (s->param_presence_flags & PARAM_FIR) | |
792 | if (get_bits1(gbp)) | |
793 | if ((ret = read_filter_params(m, gbp, substr, ch, FIR)) < 0) | |
794 | return ret; | |
795 | ||
796 | if (s->param_presence_flags & PARAM_IIR) | |
797 | if (get_bits1(gbp)) | |
798 | if ((ret = read_filter_params(m, gbp, substr, ch, IIR)) < 0) | |
799 | return ret; | |
800 | ||
801 | if (fir->order + iir->order > 8) { | |
802 | av_log(m->avctx, AV_LOG_ERROR, "Total filter orders too high.\n"); | |
803 | return AVERROR_INVALIDDATA; | |
804 | } | |
805 | ||
806 | if (fir->order && iir->order && | |
807 | fir->shift != iir->shift) { | |
808 | av_log(m->avctx, AV_LOG_ERROR, | |
809 | "FIR and IIR filters must use the same precision.\n"); | |
810 | return AVERROR_INVALIDDATA; | |
811 | } | |
812 | /* The FIR and IIR filters must have the same precision. | |
813 | * To simplify the filtering code, only the precision of the | |
814 | * FIR filter is considered. If only the IIR filter is employed, | |
815 | * the FIR filter precision is set to that of the IIR filter, so | |
816 | * that the filtering code can use it. */ | |
817 | if (!fir->order && iir->order) | |
818 | fir->shift = iir->shift; | |
819 | ||
820 | if (s->param_presence_flags & PARAM_HUFFOFFSET) | |
821 | if (get_bits1(gbp)) | |
822 | cp->huff_offset = get_sbits(gbp, 15); | |
823 | ||
824 | cp->codebook = get_bits(gbp, 2); | |
825 | cp->huff_lsbs = get_bits(gbp, 5); | |
826 | ||
827 | if (cp->huff_lsbs > 24) { | |
828 | av_log(m->avctx, AV_LOG_ERROR, "Invalid huff_lsbs.\n"); | |
829 | cp->huff_lsbs = 0; | |
830 | return AVERROR_INVALIDDATA; | |
831 | } | |
832 | ||
833 | cp->sign_huff_offset = calculate_sign_huff(m, substr, ch); | |
834 | ||
835 | return 0; | |
836 | } | |
837 | ||
838 | /** Read decoding parameters that change more often than those in the restart | |
839 | * header. */ | |
840 | ||
841 | static int read_decoding_params(MLPDecodeContext *m, GetBitContext *gbp, | |
842 | unsigned int substr) | |
843 | { | |
844 | SubStream *s = &m->substream[substr]; | |
845 | unsigned int ch; | |
846 | int ret; | |
847 | ||
848 | if (s->param_presence_flags & PARAM_PRESENCE) | |
849 | if (get_bits1(gbp)) | |
850 | s->param_presence_flags = get_bits(gbp, 8); | |
851 | ||
852 | if (s->param_presence_flags & PARAM_BLOCKSIZE) | |
853 | if (get_bits1(gbp)) { | |
854 | s->blocksize = get_bits(gbp, 9); | |
855 | if (s->blocksize < 8 || s->blocksize > m->access_unit_size) { | |
856 | av_log(m->avctx, AV_LOG_ERROR, "Invalid blocksize.\n"); | |
857 | s->blocksize = 0; | |
858 | return AVERROR_INVALIDDATA; | |
859 | } | |
860 | } | |
861 | ||
862 | if (s->param_presence_flags & PARAM_MATRIX) | |
863 | if (get_bits1(gbp)) | |
864 | if ((ret = read_matrix_params(m, substr, gbp)) < 0) | |
865 | return ret; | |
866 | ||
867 | if (s->param_presence_flags & PARAM_OUTSHIFT) | |
868 | if (get_bits1(gbp)) { | |
869 | for (ch = 0; ch <= s->max_matrix_channel; ch++) | |
870 | s->output_shift[ch] = get_sbits(gbp, 4); | |
871 | if (substr == m->max_decoded_substream) | |
872 | m->dsp.mlp_pack_output = m->dsp.mlp_select_pack_output(s->ch_assign, | |
873 | s->output_shift, | |
874 | s->max_matrix_channel, | |
875 | m->avctx->sample_fmt == AV_SAMPLE_FMT_S32); | |
876 | } | |
877 | ||
878 | if (s->param_presence_flags & PARAM_QUANTSTEP) | |
879 | if (get_bits1(gbp)) | |
880 | for (ch = 0; ch <= s->max_channel; ch++) { | |
881 | ChannelParams *cp = &s->channel_params[ch]; | |
882 | ||
883 | s->quant_step_size[ch] = get_bits(gbp, 4); | |
884 | ||
885 | cp->sign_huff_offset = calculate_sign_huff(m, substr, ch); | |
886 | } | |
887 | ||
888 | for (ch = s->min_channel; ch <= s->max_channel; ch++) | |
889 | if (get_bits1(gbp)) | |
890 | if ((ret = read_channel_params(m, substr, gbp, ch)) < 0) | |
891 | return ret; | |
892 | ||
893 | return 0; | |
894 | } | |
895 | ||
896 | #define MSB_MASK(bits) (-1u << (bits)) | |
897 | ||
898 | /** Generate PCM samples using the prediction filters and residual values | |
899 | * read from the data stream, and update the filter state. */ | |
900 | ||
901 | static void filter_channel(MLPDecodeContext *m, unsigned int substr, | |
902 | unsigned int channel) | |
903 | { | |
904 | SubStream *s = &m->substream[substr]; | |
905 | const int32_t *fircoeff = s->channel_params[channel].coeff[FIR]; | |
906 | int32_t state_buffer[NUM_FILTERS][MAX_BLOCKSIZE + MAX_FIR_ORDER]; | |
907 | int32_t *firbuf = state_buffer[FIR] + MAX_BLOCKSIZE; | |
908 | int32_t *iirbuf = state_buffer[IIR] + MAX_BLOCKSIZE; | |
909 | FilterParams *fir = &s->channel_params[channel].filter_params[FIR]; | |
910 | FilterParams *iir = &s->channel_params[channel].filter_params[IIR]; | |
911 | unsigned int filter_shift = fir->shift; | |
912 | int32_t mask = MSB_MASK(s->quant_step_size[channel]); | |
913 | ||
914 | memcpy(firbuf, fir->state, MAX_FIR_ORDER * sizeof(int32_t)); | |
915 | memcpy(iirbuf, iir->state, MAX_IIR_ORDER * sizeof(int32_t)); | |
916 | ||
917 | m->dsp.mlp_filter_channel(firbuf, fircoeff, | |
918 | fir->order, iir->order, | |
919 | filter_shift, mask, s->blocksize, | |
920 | &m->sample_buffer[s->blockpos][channel]); | |
921 | ||
922 | memcpy(fir->state, firbuf - s->blocksize, MAX_FIR_ORDER * sizeof(int32_t)); | |
923 | memcpy(iir->state, iirbuf - s->blocksize, MAX_IIR_ORDER * sizeof(int32_t)); | |
924 | } | |
925 | ||
926 | /** Read a block of PCM residual data (or actual if no filtering active). */ | |
927 | ||
928 | static int read_block_data(MLPDecodeContext *m, GetBitContext *gbp, | |
929 | unsigned int substr) | |
930 | { | |
931 | SubStream *s = &m->substream[substr]; | |
932 | unsigned int i, ch, expected_stream_pos = 0; | |
933 | int ret; | |
934 | ||
935 | if (s->data_check_present) { | |
936 | expected_stream_pos = get_bits_count(gbp); | |
937 | expected_stream_pos += get_bits(gbp, 16); | |
938 | avpriv_request_sample(m->avctx, | |
939 | "Substreams with VLC block size check info"); | |
940 | } | |
941 | ||
942 | if (s->blockpos + s->blocksize > m->access_unit_size) { | |
943 | av_log(m->avctx, AV_LOG_ERROR, "too many audio samples in frame\n"); | |
944 | return AVERROR_INVALIDDATA; | |
945 | } | |
946 | ||
947 | memset(&m->bypassed_lsbs[s->blockpos][0], 0, | |
948 | s->blocksize * sizeof(m->bypassed_lsbs[0])); | |
949 | ||
950 | for (i = 0; i < s->blocksize; i++) | |
951 | if ((ret = read_huff_channels(m, gbp, substr, i)) < 0) | |
952 | return ret; | |
953 | ||
954 | for (ch = s->min_channel; ch <= s->max_channel; ch++) | |
955 | filter_channel(m, substr, ch); | |
956 | ||
957 | s->blockpos += s->blocksize; | |
958 | ||
959 | if (s->data_check_present) { | |
960 | if (get_bits_count(gbp) != expected_stream_pos) | |
961 | av_log(m->avctx, AV_LOG_ERROR, "block data length mismatch\n"); | |
962 | skip_bits(gbp, 8); | |
963 | } | |
964 | ||
965 | return 0; | |
966 | } | |
967 | ||
968 | /** Data table used for TrueHD noise generation function. */ | |
969 | ||
970 | static const int8_t noise_table[256] = { | |
971 | 30, 51, 22, 54, 3, 7, -4, 38, 14, 55, 46, 81, 22, 58, -3, 2, | |
972 | 52, 31, -7, 51, 15, 44, 74, 30, 85, -17, 10, 33, 18, 80, 28, 62, | |
973 | 10, 32, 23, 69, 72, 26, 35, 17, 73, 60, 8, 56, 2, 6, -2, -5, | |
974 | 51, 4, 11, 50, 66, 76, 21, 44, 33, 47, 1, 26, 64, 48, 57, 40, | |
975 | 38, 16, -10, -28, 92, 22, -18, 29, -10, 5, -13, 49, 19, 24, 70, 34, | |
976 | 61, 48, 30, 14, -6, 25, 58, 33, 42, 60, 67, 17, 54, 17, 22, 30, | |
977 | 67, 44, -9, 50, -11, 43, 40, 32, 59, 82, 13, 49, -14, 55, 60, 36, | |
978 | 48, 49, 31, 47, 15, 12, 4, 65, 1, 23, 29, 39, 45, -2, 84, 69, | |
979 | 0, 72, 37, 57, 27, 41, -15, -16, 35, 31, 14, 61, 24, 0, 27, 24, | |
980 | 16, 41, 55, 34, 53, 9, 56, 12, 25, 29, 53, 5, 20, -20, -8, 20, | |
981 | 13, 28, -3, 78, 38, 16, 11, 62, 46, 29, 21, 24, 46, 65, 43, -23, | |
982 | 89, 18, 74, 21, 38, -12, 19, 12, -19, 8, 15, 33, 4, 57, 9, -8, | |
983 | 36, 35, 26, 28, 7, 83, 63, 79, 75, 11, 3, 87, 37, 47, 34, 40, | |
984 | 39, 19, 20, 42, 27, 34, 39, 77, 13, 42, 59, 64, 45, -1, 32, 37, | |
985 | 45, -5, 53, -6, 7, 36, 50, 23, 6, 32, 9, -21, 18, 71, 27, 52, | |
986 | -25, 31, 35, 42, -1, 68, 63, 52, 26, 43, 66, 37, 41, 25, 40, 70, | |
987 | }; | |
988 | ||
989 | /** Noise generation functions. | |
990 | * I'm not sure what these are for - they seem to be some kind of pseudorandom | |
991 | * sequence generators, used to generate noise data which is used when the | |
992 | * channels are rematrixed. I'm not sure if they provide a practical benefit | |
993 | * to compression, or just obfuscate the decoder. Are they for some kind of | |
994 | * dithering? */ | |
995 | ||
996 | /** Generate two channels of noise, used in the matrix when | |
997 | * restart sync word == 0x31ea. */ | |
998 | ||
999 | static void generate_2_noise_channels(MLPDecodeContext *m, unsigned int substr) | |
1000 | { | |
1001 | SubStream *s = &m->substream[substr]; | |
1002 | unsigned int i; | |
1003 | uint32_t seed = s->noisegen_seed; | |
1004 | unsigned int maxchan = s->max_matrix_channel; | |
1005 | ||
1006 | for (i = 0; i < s->blockpos; i++) { | |
1007 | uint16_t seed_shr7 = seed >> 7; | |
1008 | m->sample_buffer[i][maxchan+1] = ((int8_t)(seed >> 15)) << s->noise_shift; | |
1009 | m->sample_buffer[i][maxchan+2] = ((int8_t) seed_shr7) << s->noise_shift; | |
1010 | ||
1011 | seed = (seed << 16) ^ seed_shr7 ^ (seed_shr7 << 5); | |
1012 | } | |
1013 | ||
1014 | s->noisegen_seed = seed; | |
1015 | } | |
1016 | ||
1017 | /** Generate a block of noise, used when restart sync word == 0x31eb. */ | |
1018 | ||
1019 | static void fill_noise_buffer(MLPDecodeContext *m, unsigned int substr) | |
1020 | { | |
1021 | SubStream *s = &m->substream[substr]; | |
1022 | unsigned int i; | |
1023 | uint32_t seed = s->noisegen_seed; | |
1024 | ||
1025 | for (i = 0; i < m->access_unit_size_pow2; i++) { | |
1026 | uint8_t seed_shr15 = seed >> 15; | |
1027 | m->noise_buffer[i] = noise_table[seed_shr15]; | |
1028 | seed = (seed << 8) ^ seed_shr15 ^ (seed_shr15 << 5); | |
1029 | } | |
1030 | ||
1031 | s->noisegen_seed = seed; | |
1032 | } | |
1033 | ||
1034 | ||
1035 | /** Apply the channel matrices in turn to reconstruct the original audio | |
1036 | * samples. */ | |
1037 | ||
1038 | static void rematrix_channels(MLPDecodeContext *m, unsigned int substr) | |
1039 | { | |
1040 | SubStream *s = &m->substream[substr]; | |
1041 | unsigned int mat; | |
1042 | unsigned int maxchan; | |
1043 | ||
1044 | maxchan = s->max_matrix_channel; | |
1045 | if (!s->noise_type) { | |
1046 | generate_2_noise_channels(m, substr); | |
1047 | maxchan += 2; | |
1048 | } else { | |
1049 | fill_noise_buffer(m, substr); | |
1050 | } | |
1051 | ||
1052 | for (mat = 0; mat < s->num_primitive_matrices; mat++) { | |
1053 | unsigned int dest_ch = s->matrix_out_ch[mat]; | |
1054 | m->dsp.mlp_rematrix_channel(&m->sample_buffer[0][0], | |
1055 | s->matrix_coeff[mat], | |
1056 | &m->bypassed_lsbs[0][mat], | |
1057 | m->noise_buffer, | |
1058 | s->num_primitive_matrices - mat, | |
1059 | dest_ch, | |
1060 | s->blockpos, | |
1061 | maxchan, | |
1062 | s->matrix_noise_shift[mat], | |
1063 | m->access_unit_size_pow2, | |
1064 | MSB_MASK(s->quant_step_size[dest_ch])); | |
1065 | } | |
1066 | } | |
1067 | ||
1068 | /** Write the audio data into the output buffer. */ | |
1069 | ||
1070 | static int output_data(MLPDecodeContext *m, unsigned int substr, | |
1071 | AVFrame *frame, int *got_frame_ptr) | |
1072 | { | |
1073 | AVCodecContext *avctx = m->avctx; | |
1074 | SubStream *s = &m->substream[substr]; | |
1075 | int ret; | |
1076 | int is32 = (m->avctx->sample_fmt == AV_SAMPLE_FMT_S32); | |
1077 | ||
1078 | if (m->avctx->channels != s->max_matrix_channel + 1) { | |
1079 | av_log(m->avctx, AV_LOG_ERROR, "channel count mismatch\n"); | |
1080 | return AVERROR_INVALIDDATA; | |
1081 | } | |
1082 | ||
1083 | if (!s->blockpos) { | |
1084 | av_log(avctx, AV_LOG_ERROR, "No samples to output.\n"); | |
1085 | return AVERROR_INVALIDDATA; | |
1086 | } | |
1087 | ||
1088 | /* get output buffer */ | |
1089 | frame->nb_samples = s->blockpos; | |
1090 | if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) | |
1091 | return ret; | |
1092 | s->lossless_check_data = m->dsp.mlp_pack_output(s->lossless_check_data, | |
1093 | s->blockpos, | |
1094 | m->sample_buffer, | |
1095 | frame->data[0], | |
1096 | s->ch_assign, | |
1097 | s->output_shift, | |
1098 | s->max_matrix_channel, | |
1099 | is32); | |
1100 | ||
1101 | /* Update matrix encoding side data */ | |
1102 | if ((ret = ff_side_data_update_matrix_encoding(frame, s->matrix_encoding)) < 0) | |
1103 | return ret; | |
1104 | ||
1105 | *got_frame_ptr = 1; | |
1106 | ||
1107 | return 0; | |
1108 | } | |
1109 | ||
1110 | /** Read an access unit from the stream. | |
1111 | * @return negative on error, 0 if not enough data is present in the input stream, | |
1112 | * otherwise the number of bytes consumed. */ | |
1113 | ||
1114 | static int read_access_unit(AVCodecContext *avctx, void* data, | |
1115 | int *got_frame_ptr, AVPacket *avpkt) | |
1116 | { | |
1117 | const uint8_t *buf = avpkt->data; | |
1118 | int buf_size = avpkt->size; | |
1119 | MLPDecodeContext *m = avctx->priv_data; | |
1120 | GetBitContext gb; | |
1121 | unsigned int length, substr; | |
1122 | unsigned int substream_start; | |
1123 | unsigned int header_size = 4; | |
1124 | unsigned int substr_header_size = 0; | |
1125 | uint8_t substream_parity_present[MAX_SUBSTREAMS]; | |
1126 | uint16_t substream_data_len[MAX_SUBSTREAMS]; | |
1127 | uint8_t parity_bits; | |
1128 | int ret; | |
1129 | ||
1130 | if (buf_size < 4) | |
1131 | return AVERROR_INVALIDDATA; | |
1132 | ||
1133 | length = (AV_RB16(buf) & 0xfff) * 2; | |
1134 | ||
1135 | if (length < 4 || length > buf_size) | |
1136 | return AVERROR_INVALIDDATA; | |
1137 | ||
1138 | init_get_bits(&gb, (buf + 4), (length - 4) * 8); | |
1139 | ||
1140 | m->is_major_sync_unit = 0; | |
1141 | if (show_bits_long(&gb, 31) == (0xf8726fba >> 1)) { | |
1142 | if (read_major_sync(m, &gb) < 0) | |
1143 | goto error; | |
1144 | m->is_major_sync_unit = 1; | |
1145 | header_size += 28; | |
1146 | } | |
1147 | ||
1148 | if (!m->params_valid) { | |
1149 | av_log(m->avctx, AV_LOG_WARNING, | |
1150 | "Stream parameters not seen; skipping frame.\n"); | |
1151 | *got_frame_ptr = 0; | |
1152 | return length; | |
1153 | } | |
1154 | ||
1155 | substream_start = 0; | |
1156 | ||
1157 | for (substr = 0; substr < m->num_substreams; substr++) { | |
1158 | int extraword_present, checkdata_present, end, nonrestart_substr; | |
1159 | ||
1160 | extraword_present = get_bits1(&gb); | |
1161 | nonrestart_substr = get_bits1(&gb); | |
1162 | checkdata_present = get_bits1(&gb); | |
1163 | skip_bits1(&gb); | |
1164 | ||
1165 | end = get_bits(&gb, 12) * 2; | |
1166 | ||
1167 | substr_header_size += 2; | |
1168 | ||
1169 | if (extraword_present) { | |
1170 | if (m->avctx->codec_id == AV_CODEC_ID_MLP) { | |
1171 | av_log(m->avctx, AV_LOG_ERROR, "There must be no extraword for MLP.\n"); | |
1172 | goto error; | |
1173 | } | |
1174 | skip_bits(&gb, 16); | |
1175 | substr_header_size += 2; | |
1176 | } | |
1177 | ||
1178 | if (!(nonrestart_substr ^ m->is_major_sync_unit)) { | |
1179 | av_log(m->avctx, AV_LOG_ERROR, "Invalid nonrestart_substr.\n"); | |
1180 | goto error; | |
1181 | } | |
1182 | ||
1183 | if (end + header_size + substr_header_size > length) { | |
1184 | av_log(m->avctx, AV_LOG_ERROR, | |
1185 | "Indicated length of substream %d data goes off end of " | |
1186 | "packet.\n", substr); | |
1187 | end = length - header_size - substr_header_size; | |
1188 | } | |
1189 | ||
1190 | if (end < substream_start) { | |
1191 | av_log(avctx, AV_LOG_ERROR, | |
1192 | "Indicated end offset of substream %d data " | |
1193 | "is smaller than calculated start offset.\n", | |
1194 | substr); | |
1195 | goto error; | |
1196 | } | |
1197 | ||
1198 | if (substr > m->max_decoded_substream) | |
1199 | continue; | |
1200 | ||
1201 | substream_parity_present[substr] = checkdata_present; | |
1202 | substream_data_len[substr] = end - substream_start; | |
1203 | substream_start = end; | |
1204 | } | |
1205 | ||
1206 | parity_bits = ff_mlp_calculate_parity(buf, 4); | |
1207 | parity_bits ^= ff_mlp_calculate_parity(buf + header_size, substr_header_size); | |
1208 | ||
1209 | if ((((parity_bits >> 4) ^ parity_bits) & 0xF) != 0xF) { | |
1210 | av_log(avctx, AV_LOG_ERROR, "Parity check failed.\n"); | |
1211 | goto error; | |
1212 | } | |
1213 | ||
1214 | buf += header_size + substr_header_size; | |
1215 | ||
1216 | for (substr = 0; substr <= m->max_decoded_substream; substr++) { | |
1217 | SubStream *s = &m->substream[substr]; | |
1218 | init_get_bits(&gb, buf, substream_data_len[substr] * 8); | |
1219 | ||
1220 | m->matrix_changed = 0; | |
1221 | memset(m->filter_changed, 0, sizeof(m->filter_changed)); | |
1222 | ||
1223 | s->blockpos = 0; | |
1224 | do { | |
1225 | if (get_bits1(&gb)) { | |
1226 | if (get_bits1(&gb)) { | |
1227 | /* A restart header should be present. */ | |
1228 | if (read_restart_header(m, &gb, buf, substr) < 0) | |
1229 | goto next_substr; | |
1230 | s->restart_seen = 1; | |
1231 | } | |
1232 | ||
1233 | if (!s->restart_seen) | |
1234 | goto next_substr; | |
1235 | if (read_decoding_params(m, &gb, substr) < 0) | |
1236 | goto next_substr; | |
1237 | } | |
1238 | ||
1239 | if (!s->restart_seen) | |
1240 | goto next_substr; | |
1241 | ||
1242 | if ((ret = read_block_data(m, &gb, substr)) < 0) | |
1243 | return ret; | |
1244 | ||
1245 | if (get_bits_count(&gb) >= substream_data_len[substr] * 8) | |
1246 | goto substream_length_mismatch; | |
1247 | ||
1248 | } while (!get_bits1(&gb)); | |
1249 | ||
1250 | skip_bits(&gb, (-get_bits_count(&gb)) & 15); | |
1251 | ||
1252 | if (substream_data_len[substr] * 8 - get_bits_count(&gb) >= 32) { | |
1253 | int shorten_by; | |
1254 | ||
1255 | if (get_bits(&gb, 16) != 0xD234) | |
1256 | return AVERROR_INVALIDDATA; | |
1257 | ||
1258 | shorten_by = get_bits(&gb, 16); | |
1259 | if (m->avctx->codec_id == AV_CODEC_ID_TRUEHD && shorten_by & 0x2000) | |
1260 | s->blockpos -= FFMIN(shorten_by & 0x1FFF, s->blockpos); | |
1261 | else if (m->avctx->codec_id == AV_CODEC_ID_MLP && shorten_by != 0xD234) | |
1262 | return AVERROR_INVALIDDATA; | |
1263 | ||
1264 | if (substr == m->max_decoded_substream) | |
1265 | av_log(m->avctx, AV_LOG_INFO, "End of stream indicated.\n"); | |
1266 | } | |
1267 | ||
1268 | if (substream_parity_present[substr]) { | |
1269 | uint8_t parity, checksum; | |
1270 | ||
1271 | if (substream_data_len[substr] * 8 - get_bits_count(&gb) != 16) | |
1272 | goto substream_length_mismatch; | |
1273 | ||
1274 | parity = ff_mlp_calculate_parity(buf, substream_data_len[substr] - 2); | |
1275 | checksum = ff_mlp_checksum8 (buf, substream_data_len[substr] - 2); | |
1276 | ||
1277 | if ((get_bits(&gb, 8) ^ parity) != 0xa9 ) | |
1278 | av_log(m->avctx, AV_LOG_ERROR, "Substream %d parity check failed.\n", substr); | |
1279 | if ( get_bits(&gb, 8) != checksum) | |
1280 | av_log(m->avctx, AV_LOG_ERROR, "Substream %d checksum failed.\n" , substr); | |
1281 | } | |
1282 | ||
1283 | if (substream_data_len[substr] * 8 != get_bits_count(&gb)) | |
1284 | goto substream_length_mismatch; | |
1285 | ||
1286 | next_substr: | |
1287 | if (!s->restart_seen) | |
1288 | av_log(m->avctx, AV_LOG_ERROR, | |
1289 | "No restart header present in substream %d.\n", substr); | |
1290 | ||
1291 | buf += substream_data_len[substr]; | |
1292 | } | |
1293 | ||
1294 | rematrix_channels(m, m->max_decoded_substream); | |
1295 | ||
1296 | if ((ret = output_data(m, m->max_decoded_substream, data, got_frame_ptr)) < 0) | |
1297 | return ret; | |
1298 | ||
1299 | return length; | |
1300 | ||
1301 | substream_length_mismatch: | |
1302 | av_log(m->avctx, AV_LOG_ERROR, "substream %d length mismatch\n", substr); | |
1303 | return AVERROR_INVALIDDATA; | |
1304 | ||
1305 | error: | |
1306 | m->params_valid = 0; | |
1307 | return AVERROR_INVALIDDATA; | |
1308 | } | |
1309 | ||
1310 | #if CONFIG_MLP_DECODER | |
1311 | AVCodec ff_mlp_decoder = { | |
1312 | .name = "mlp", | |
1313 | .long_name = NULL_IF_CONFIG_SMALL("MLP (Meridian Lossless Packing)"), | |
1314 | .type = AVMEDIA_TYPE_AUDIO, | |
1315 | .id = AV_CODEC_ID_MLP, | |
1316 | .priv_data_size = sizeof(MLPDecodeContext), | |
1317 | .init = mlp_decode_init, | |
1318 | .decode = read_access_unit, | |
1319 | .capabilities = CODEC_CAP_DR1, | |
1320 | }; | |
1321 | #endif | |
1322 | #if CONFIG_TRUEHD_DECODER | |
1323 | AVCodec ff_truehd_decoder = { | |
1324 | .name = "truehd", | |
1325 | .long_name = NULL_IF_CONFIG_SMALL("TrueHD"), | |
1326 | .type = AVMEDIA_TYPE_AUDIO, | |
1327 | .id = AV_CODEC_ID_TRUEHD, | |
1328 | .priv_data_size = sizeof(MLPDecodeContext), | |
1329 | .init = mlp_decode_init, | |
1330 | .decode = read_access_unit, | |
1331 | .capabilities = CODEC_CAP_DR1, | |
1332 | }; | |
1333 | #endif /* CONFIG_TRUEHD_DECODER */ |