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1 | /* | ||
2 | * E-AC-3 decoder | ||
3 | * Copyright (c) 2007 Bartlomiej Wolowiec <bartek.wolowiec@gmail.com> | ||
4 | * Copyright (c) 2008 Justin Ruggles | ||
5 | * | ||
6 | * This file is part of FFmpeg. | ||
7 | * | ||
8 | * FFmpeg is free software; you can redistribute it and/or | ||
9 | * modify it under the terms of the GNU Lesser General Public | ||
10 | * License as published by the Free Software Foundation; either | ||
11 | * version 2.1 of the License, or (at your option) any later version. | ||
12 | * | ||
13 | * FFmpeg is distributed in the hope that it will be useful, | ||
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
16 | * Lesser General Public License for more details. | ||
17 | * | ||
18 | * You should have received a copy of the GNU Lesser General Public | ||
19 | * License along with FFmpeg; if not, write to the Free Software | ||
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
21 | */ | ||
22 | |||
23 | /* | ||
24 | * There are several features of E-AC-3 that this decoder does not yet support. | ||
25 | * | ||
26 | * Enhanced Coupling | ||
27 | * No known samples exist. If any ever surface, this feature should not be | ||
28 | * too difficult to implement. | ||
29 | * | ||
30 | * Reduced Sample Rates | ||
31 | * No known samples exist. The spec also does not give clear information | ||
32 | * on how this is to be implemented. | ||
33 | * | ||
34 | * Transient Pre-noise Processing | ||
35 | * This is side information which a decoder should use to reduce artifacts | ||
36 | * caused by transients. There are samples which are known to have this | ||
37 | * information, but this decoder currently ignores it. | ||
38 | */ | ||
39 | |||
40 | |||
41 | #include "avcodec.h" | ||
42 | #include "ac3.h" | ||
43 | #include "ac3_parser_internal.h" | ||
44 | #include "ac3dec.h" | ||
45 | #include "ac3dec_data.h" | ||
46 | #include "eac3_data.h" | ||
47 | |||
48 | /** gain adaptive quantization mode */ | ||
49 | typedef enum { | ||
50 | EAC3_GAQ_NO =0, | ||
51 | EAC3_GAQ_12, | ||
52 | EAC3_GAQ_14, | ||
53 | EAC3_GAQ_124 | ||
54 | } EAC3GaqMode; | ||
55 | |||
56 | 3252 | static void ff_eac3_apply_spectral_extension(AC3DecodeContext *s) | |
57 | { | ||
58 | int bin, bnd, ch, i; | ||
59 | 3252 | uint8_t wrapflag[SPX_MAX_BANDS]={1,0,}, num_copy_sections, copy_sizes[SPX_MAX_BANDS]; | |
60 | float rms_energy[SPX_MAX_BANDS]; | ||
61 | |||
62 | /* Set copy index mapping table. Set wrap flags to apply a notch filter at | ||
63 | wrap points later on. */ | ||
64 | 3252 | bin = s->spx_dst_start_freq; | |
65 | 3252 | num_copy_sections = 0; | |
66 |
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10620 | for (bnd = 0; bnd < s->num_spx_bands; bnd++) { |
67 | int copysize; | ||
68 | 7368 | int bandsize = s->spx_band_sizes[bnd]; | |
69 |
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7368 | if (bin + bandsize > s->spx_src_start_freq) { |
70 | ✗ | copy_sizes[num_copy_sections++] = bin - s->spx_dst_start_freq; | |
71 | ✗ | bin = s->spx_dst_start_freq; | |
72 | ✗ | wrapflag[bnd] = 1; | |
73 | } | ||
74 |
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14736 | for (i = 0; i < bandsize; i += copysize) { |
75 |
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7368 | if (bin == s->spx_src_start_freq) { |
76 | ✗ | copy_sizes[num_copy_sections++] = bin - s->spx_dst_start_freq; | |
77 | ✗ | bin = s->spx_dst_start_freq; | |
78 | } | ||
79 | 7368 | copysize = FFMIN(bandsize - i, s->spx_src_start_freq - bin); | |
80 | 7368 | bin += copysize; | |
81 | } | ||
82 | } | ||
83 | 3252 | copy_sizes[num_copy_sections++] = bin - s->spx_dst_start_freq; | |
84 | |||
85 |
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10620 | for (ch = 1; ch <= s->fbw_channels; ch++) { |
86 |
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7368 | if (!s->channel_uses_spx[ch]) |
87 | ✗ | continue; | |
88 | |||
89 | /* Copy coeffs from normal bands to extension bands */ | ||
90 | 7368 | bin = s->spx_src_start_freq; | |
91 |
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14736 | for (i = 0; i < num_copy_sections; i++) { |
92 | 7368 | memcpy(&s->transform_coeffs[ch][bin], | |
93 | 7368 | &s->transform_coeffs[ch][s->spx_dst_start_freq], | |
94 | 7368 | copy_sizes[i]*sizeof(INTFLOAT)); | |
95 | 7368 | bin += copy_sizes[i]; | |
96 | } | ||
97 | |||
98 | /* Calculate RMS energy for each SPX band. */ | ||
99 | 7368 | bin = s->spx_src_start_freq; | |
100 |
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26424 | for (bnd = 0; bnd < s->num_spx_bands; bnd++) { |
101 | 19056 | int bandsize = s->spx_band_sizes[bnd]; | |
102 | 19056 | float accum = 0.0f; | |
103 |
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265008 | for (i = 0; i < bandsize; i++) { |
104 | 245952 | float coeff = s->transform_coeffs[ch][bin++]; | |
105 | 245952 | accum += coeff * coeff; | |
106 | } | ||
107 | 19056 | rms_energy[bnd] = sqrtf(accum / bandsize); | |
108 | } | ||
109 | |||
110 | /* Apply a notch filter at transitions between normal and extension | ||
111 | bands and at all wrap points. */ | ||
112 |
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7368 | if (s->spx_atten_code[ch] >= 0) { |
113 | 6330 | const float *atten_tab = ff_eac3_spx_atten_tab[s->spx_atten_code[ch]]; | |
114 | 6330 | bin = s->spx_src_start_freq - 2; | |
115 |
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20196 | for (bnd = 0; bnd < s->num_spx_bands; bnd++) { |
116 |
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13866 | if (wrapflag[bnd]) { |
117 | 6330 | INTFLOAT *coeffs = &s->transform_coeffs[ch][bin]; | |
118 | 6330 | coeffs[0] *= atten_tab[0]; | |
119 | 6330 | coeffs[1] *= atten_tab[1]; | |
120 | 6330 | coeffs[2] *= atten_tab[2]; | |
121 | 6330 | coeffs[3] *= atten_tab[1]; | |
122 | 6330 | coeffs[4] *= atten_tab[0]; | |
123 | } | ||
124 | 13866 | bin += s->spx_band_sizes[bnd]; | |
125 | } | ||
126 | } | ||
127 | |||
128 | /* Apply noise-blended coefficient scaling based on previously | ||
129 | calculated RMS energy, blending factors, and SPX coordinates for | ||
130 | each band. */ | ||
131 | 7368 | bin = s->spx_src_start_freq; | |
132 |
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26424 | for (bnd = 0; bnd < s->num_spx_bands; bnd++) { |
133 | 19056 | float nscale = s->spx_noise_blend[ch][bnd] * rms_energy[bnd] * (1.0f / INT32_MIN); | |
134 | 19056 | float sscale = s->spx_signal_blend[ch][bnd]; | |
135 | #if USE_FIXED | ||
136 | // spx_noise_blend and spx_signal_blend are both FP.23 | ||
137 | ✗ | nscale *= 1.0 / (1<<23); | |
138 | ✗ | sscale *= 1.0 / (1<<23); | |
139 | ✗ | if (nscale < -1.0) | |
140 | ✗ | nscale = -1.0; | |
141 | #endif | ||
142 |
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265008 | for (i = 0; i < s->spx_band_sizes[bnd]; i++) { |
143 | 245952 | UINTFLOAT noise = (INTFLOAT)(nscale * (int32_t)av_lfg_get(&s->dith_state)); | |
144 | 245952 | s->transform_coeffs[ch][bin] *= sscale; | |
145 | 245952 | s->transform_coeffs[ch][bin++] += noise; | |
146 | } | ||
147 | } | ||
148 | } | ||
149 | 3252 | } | |
150 | |||
151 | |||
152 | /** lrint(M_SQRT2*cos(2*M_PI/12)*(1<<23)) */ | ||
153 | #define COEFF_0 10273905LL | ||
154 | |||
155 | /** lrint(M_SQRT2*cos(0*M_PI/12)*(1<<23)) = lrint(M_SQRT2*(1<<23)) */ | ||
156 | #define COEFF_1 11863283LL | ||
157 | |||
158 | /** lrint(M_SQRT2*cos(5*M_PI/12)*(1<<23)) */ | ||
159 | #define COEFF_2 3070444LL | ||
160 | |||
161 | /** | ||
162 | * Calculate 6-point IDCT of the pre-mantissas. | ||
163 | * All calculations are 24-bit fixed-point. | ||
164 | */ | ||
165 | 99870 | static void idct6(int pre_mant[6]) | |
166 | { | ||
167 | int tmp; | ||
168 | int even0, even1, even2, odd0, odd1, odd2; | ||
169 | |||
170 | 99870 | odd1 = pre_mant[1] - pre_mant[3] - pre_mant[5]; | |
171 | |||
172 | 99870 | even2 = ( pre_mant[2] * COEFF_0) >> 23; | |
173 | 99870 | tmp = ( pre_mant[4] * COEFF_1) >> 23; | |
174 | 99870 | odd0 = ((pre_mant[1] + pre_mant[5]) * COEFF_2) >> 23; | |
175 | |||
176 | 99870 | even0 = pre_mant[0] + (tmp >> 1); | |
177 | 99870 | even1 = pre_mant[0] - tmp; | |
178 | |||
179 | 99870 | tmp = even0; | |
180 | 99870 | even0 = tmp + even2; | |
181 | 99870 | even2 = tmp - even2; | |
182 | |||
183 | 99870 | tmp = odd0; | |
184 | 99870 | odd0 = tmp + pre_mant[1] + pre_mant[3]; | |
185 | 99870 | odd2 = tmp + pre_mant[5] - pre_mant[3]; | |
186 | |||
187 | 99870 | pre_mant[0] = even0 + odd0; | |
188 | 99870 | pre_mant[1] = even1 + odd1; | |
189 | 99870 | pre_mant[2] = even2 + odd2; | |
190 | 99870 | pre_mant[3] = even2 - odd2; | |
191 | 99870 | pre_mant[4] = even1 - odd1; | |
192 | 99870 | pre_mant[5] = even0 - odd0; | |
193 | 99870 | } | |
194 | |||
195 | 816 | static void ff_eac3_decode_transform_coeffs_aht_ch(AC3DecodeContext *s, int ch) | |
196 | { | ||
197 | int bin, blk, gs; | ||
198 | int end_bap, gaq_mode; | ||
199 | 816 | GetBitContext *gbc = &s->gbc; | |
200 | int gaq_gain[AC3_MAX_COEFS]; | ||
201 | |||
202 | 816 | gaq_mode = get_bits(gbc, 2); | |
203 |
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816 | end_bap = (gaq_mode < 2) ? 12 : 17; |
204 | |||
205 | /* if GAQ gain is used, decode gain codes for bins with hebap between | ||
206 | 8 and end_bap */ | ||
207 | 816 | gs = 0; | |
208 |
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816 | if (gaq_mode == EAC3_GAQ_12 || gaq_mode == EAC3_GAQ_14) { |
209 | /* read 1-bit GAQ gain codes */ | ||
210 |
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88262 | for (bin = s->start_freq[ch]; bin < s->end_freq[ch]; bin++) { |
211 |
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87559 | if (s->bap[ch][bin] > 7 && s->bap[ch][bin] < end_bap) |
212 | 31648 | gaq_gain[gs++] = get_bits1(gbc) << (gaq_mode-1); | |
213 | } | ||
214 |
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113 | } else if (gaq_mode == EAC3_GAQ_124) { |
215 | /* read 1.67-bit GAQ gain codes (3 codes in 5 bits) */ | ||
216 | 52 | int gc = 2; | |
217 |
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6560 | for (bin = s->start_freq[ch]; bin < s->end_freq[ch]; bin++) { |
218 |
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6508 | if (s->bap[ch][bin] > 7 && s->bap[ch][bin] < 17) { |
219 |
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1905 | if (gc++ == 2) { |
220 | 655 | int group_code = get_bits(gbc, 5); | |
221 |
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655 | if (group_code > 26) { |
222 | ✗ | av_log(s->avctx, AV_LOG_WARNING, "GAQ gain group code out-of-range\n"); | |
223 | ✗ | group_code = 26; | |
224 | } | ||
225 | 655 | gaq_gain[gs++] = ff_ac3_ungroup_3_in_5_bits_tab[group_code][0]; | |
226 | 655 | gaq_gain[gs++] = ff_ac3_ungroup_3_in_5_bits_tab[group_code][1]; | |
227 | 655 | gaq_gain[gs++] = ff_ac3_ungroup_3_in_5_bits_tab[group_code][2]; | |
228 | 655 | gc = 0; | |
229 | } | ||
230 | } | ||
231 | } | ||
232 | } | ||
233 | |||
234 | 816 | gs=0; | |
235 |
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100686 | for (bin = s->start_freq[ch]; bin < s->end_freq[ch]; bin++) { |
236 | 99870 | int hebap = s->bap[ch][bin]; | |
237 | 99870 | int bits = ff_eac3_bits_vs_hebap[hebap]; | |
238 |
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99870 | if (!hebap) { |
239 | /* zero-mantissa dithering */ | ||
240 |
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224756 | for (blk = 0; blk < 6; blk++) { |
241 | 192648 | s->pre_mantissa[ch][bin][blk] = (av_lfg_get(&s->dith_state) & 0x7FFFFF) - 0x400000; | |
242 | } | ||
243 |
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67762 | } else if (hebap < 8) { |
244 | /* Vector Quantization */ | ||
245 | 31275 | int v = get_bits(gbc, bits); | |
246 |
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218925 | for (blk = 0; blk < 6; blk++) { |
247 | 187650 | s->pre_mantissa[ch][bin][blk] = ff_eac3_mantissa_vq[hebap][v][blk] * (1 << 8); | |
248 | } | ||
249 | } else { | ||
250 | /* Gain Adaptive Quantization */ | ||
251 | int gbits, log_gain; | ||
252 |
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36487 | if (gaq_mode != EAC3_GAQ_NO && hebap < end_bap) { |
253 | 33553 | log_gain = gaq_gain[gs++]; | |
254 | } else { | ||
255 | 2934 | log_gain = 0; | |
256 | } | ||
257 | 36487 | gbits = bits - log_gain; | |
258 | |||
259 |
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255409 | for (blk = 0; blk < 6; blk++) { |
260 | 218922 | int mant = get_sbits(gbc, gbits); | |
261 |
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218922 | if (log_gain && mant == -(1 << (gbits-1))) { |
262 | /* large mantissa */ | ||
263 | int b; | ||
264 | 24721 | int mbits = bits - (2 - log_gain); | |
265 | 24721 | mant = get_sbits(gbc, mbits); | |
266 | 24721 | mant = ((unsigned)mant) << (23 - (mbits - 1)); | |
267 | /* remap mantissa value to correct for asymmetric quantization */ | ||
268 |
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24721 | if (mant >= 0) |
269 | 12278 | b = 1 << (23 - log_gain); | |
270 | else | ||
271 | 12443 | b = ff_eac3_gaq_remap_2_4_b[hebap-8][log_gain-1] * (1 << 8); | |
272 | 24721 | mant += ((ff_eac3_gaq_remap_2_4_a[hebap-8][log_gain-1] * (int64_t)mant) >> 15) + b; | |
273 | } else { | ||
274 | /* small mantissa, no GAQ, or Gk=1 */ | ||
275 | 194201 | mant *= (1 << 24 - bits); | |
276 |
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194201 | if (!log_gain) { |
277 | /* remap mantissa value for no GAQ or Gk=1 */ | ||
278 | 115788 | mant += (ff_eac3_gaq_remap_1[hebap-8] * (int64_t)mant) >> 15; | |
279 | } | ||
280 | } | ||
281 | 218922 | s->pre_mantissa[ch][bin][blk] = mant; | |
282 | } | ||
283 | } | ||
284 | 99870 | idct6(s->pre_mantissa[ch][bin]); | |
285 | } | ||
286 | 816 | } | |
287 | |||
288 | 1204 | static int ff_eac3_parse_header(AC3DecodeContext *s, const AC3HeaderInfo *hdr) | |
289 | { | ||
290 | int i, blk, ch; | ||
291 | int ac3_exponent_strategy, parse_aht_info, parse_spx_atten_data; | ||
292 | int parse_transient_proc_info; | ||
293 | int num_cpl_blocks; | ||
294 | 1204 | GetBitContext *gbc = &s->gbc; | |
295 | |||
296 | /* An E-AC-3 stream can have multiple independent streams which the | ||
297 | application can select from. each independent stream can also contain | ||
298 | dependent streams which are used to add or replace channels. */ | ||
299 |
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1204 | if (s->frame_type == EAC3_FRAME_TYPE_RESERVED) { |
300 | ✗ | av_log(s->avctx, AV_LOG_ERROR, "Reserved frame type\n"); | |
301 | ✗ | return AC3_PARSE_ERROR_FRAME_TYPE; | |
302 | } | ||
303 | |||
304 | /* The substream id indicates which substream this frame belongs to. each | ||
305 | independent stream has its own substream id, and the dependent streams | ||
306 | associated to an independent stream have matching substream id's. */ | ||
307 |
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1204 | if (s->substreamid) { |
308 | /* only decode substream with id=0. skip any additional substreams. */ | ||
309 | ✗ | if (!s->eac3_subsbtreamid_found) { | |
310 | ✗ | s->eac3_subsbtreamid_found = 1; | |
311 | ✗ | avpriv_request_sample(s->avctx, "Additional substreams"); | |
312 | } | ||
313 | ✗ | return AC3_PARSE_ERROR_FRAME_TYPE; | |
314 | } | ||
315 | |||
316 |
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1204 | if (s->bit_alloc_params.sr_code == EAC3_SR_CODE_REDUCED) { |
317 | /* The E-AC-3 specification does not tell how to handle reduced sample | ||
318 | rates in bit allocation. The best assumption would be that it is | ||
319 | handled like AC-3 DolbyNet, but we cannot be sure until we have a | ||
320 | sample which utilizes this feature. */ | ||
321 | ✗ | avpriv_request_sample(s->avctx, "Reduced sampling rate"); | |
322 | ✗ | return AVERROR_PATCHWELCOME; | |
323 | } | ||
324 | |||
325 | /* volume control params */ | ||
326 |
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2408 | for (i = 0; i < (s->channel_mode ? 1 : 2); i++) { |
327 | 1204 | s->dialog_normalization[i] = hdr->dialog_normalization[i]; | |
328 |
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1204 | if (s->dialog_normalization[i] == 0) { |
329 | ✗ | s->dialog_normalization[i] = -31; | |
330 | } | ||
331 |
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1204 | if (s->target_level != 0) { |
332 | ✗ | s->level_gain[i] = powf(2.0f, | |
333 | ✗ | (float)(s->target_level - s->dialog_normalization[i])/6.0f); | |
334 | } | ||
335 |
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1204 | if (hdr->compression_exists[i]) { |
336 | 930 | s->heavy_dynamic_range[i] = AC3_HEAVY_RANGE(hdr->heavy_dynamic_range[i]); | |
337 | } | ||
338 | } | ||
339 | |||
340 | 1204 | s->channel_map = hdr->channel_map; | |
341 | |||
342 | /* mixing metadata */ | ||
343 | 1204 | s->preferred_downmix = hdr->preferred_downmix; | |
344 | 1204 | s->center_mix_level_ltrt = hdr->center_mix_level_ltrt; | |
345 | 1204 | s->center_mix_level = hdr->center_mix_level; | |
346 | 1204 | s->surround_mix_level_ltrt = hdr->surround_mix_level_ltrt; | |
347 | 1204 | s->surround_mix_level = hdr->surround_mix_level; | |
348 | 1204 | s->lfe_mix_level_exists = hdr->lfe_mix_level_exists; | |
349 | 1204 | s->lfe_mix_level = hdr->lfe_mix_level; | |
350 | 1204 | s->dolby_surround_mode = hdr->dolby_surround_mode; | |
351 | 1204 | s->dolby_headphone_mode = hdr->dolby_headphone_mode; | |
352 | 1204 | s->dolby_surround_ex_mode = hdr->dolby_surround_ex_mode; | |
353 | |||
354 | /* informational metadata */ | ||
355 | 1204 | s->bitstream_mode = hdr->bitstream_mode; | |
356 | |||
357 | /* additional bitstream info */ | ||
358 | 1204 | s->eac3_extension_type_a = hdr->eac3_extension_type_a; | |
359 | |||
360 | /* audio frame syntax flags, strategy data, and per-frame data */ | ||
361 | |||
362 |
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1204 | if (s->num_blocks == 6) { |
363 | 1106 | ac3_exponent_strategy = get_bits1(gbc); | |
364 | 1106 | parse_aht_info = get_bits1(gbc); | |
365 | } else { | ||
366 | /* less than 6 blocks, so use AC-3-style exponent strategy syntax, and | ||
367 | do not use AHT */ | ||
368 | 98 | ac3_exponent_strategy = 1; | |
369 | 98 | parse_aht_info = 0; | |
370 | } | ||
371 | |||
372 | 1204 | s->snr_offset_strategy = get_bits(gbc, 2); | |
373 | 1204 | parse_transient_proc_info = get_bits1(gbc); | |
374 | |||
375 | 1204 | s->block_switch_syntax = get_bits1(gbc); | |
376 |
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1204 | if (!s->block_switch_syntax) |
377 | 1204 | memset(s->block_switch, 0, sizeof(s->block_switch)); | |
378 | |||
379 | 1204 | s->dither_flag_syntax = get_bits1(gbc); | |
380 |
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1204 | if (!s->dither_flag_syntax) { |
381 |
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4368 | for (ch = 1; ch <= s->fbw_channels; ch++) |
382 | 3164 | s->dither_flag[ch] = 1; | |
383 | } | ||
384 | 1204 | s->dither_flag[CPL_CH] = s->dither_flag[s->lfe_ch] = 0; | |
385 | |||
386 | 1204 | s->bit_allocation_syntax = get_bits1(gbc); | |
387 |
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1204 | if (!s->bit_allocation_syntax) { |
388 | /* set default bit allocation parameters */ | ||
389 | 918 | s->bit_alloc_params.slow_decay = ff_ac3_slow_decay_tab[2]; | |
390 | 918 | s->bit_alloc_params.fast_decay = ff_ac3_fast_decay_tab[1]; | |
391 | 918 | s->bit_alloc_params.slow_gain = ff_ac3_slow_gain_tab [1]; | |
392 | 918 | s->bit_alloc_params.db_per_bit = ff_ac3_db_per_bit_tab[2]; | |
393 | 918 | s->bit_alloc_params.floor = ff_ac3_floor_tab [7]; | |
394 | } | ||
395 | |||
396 | 1204 | s->fast_gain_syntax = get_bits1(gbc); | |
397 | 1204 | s->dba_syntax = get_bits1(gbc); | |
398 | 1204 | s->skip_syntax = get_bits1(gbc); | |
399 | 1204 | parse_spx_atten_data = get_bits1(gbc); | |
400 | |||
401 | /* coupling strategy occurrence and coupling use per block */ | ||
402 | 1204 | num_cpl_blocks = 0; | |
403 |
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1204 | if (s->channel_mode > 1) { |
404 |
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7938 | for (blk = 0; blk < s->num_blocks; blk++) { |
405 |
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6734 | s->cpl_strategy_exists[blk] = (!blk || get_bits1(gbc)); |
406 |
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6734 | if (s->cpl_strategy_exists[blk]) { |
407 | 1204 | s->cpl_in_use[blk] = get_bits1(gbc); | |
408 | } else { | ||
409 | 5530 | s->cpl_in_use[blk] = s->cpl_in_use[blk-1]; | |
410 | } | ||
411 | 6734 | num_cpl_blocks += s->cpl_in_use[blk]; | |
412 | } | ||
413 | } else { | ||
414 | ✗ | memset(s->cpl_in_use, 0, sizeof(s->cpl_in_use)); | |
415 | } | ||
416 | |||
417 | /* exponent strategy data */ | ||
418 |
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1204 | if (ac3_exponent_strategy) { |
419 | /* AC-3-style exponent strategy syntax */ | ||
420 |
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196 | for (blk = 0; blk < s->num_blocks; blk++) { |
421 |
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588 | for (ch = !s->cpl_in_use[blk]; ch <= s->fbw_channels; ch++) { |
422 | 490 | s->exp_strategy[blk][ch] = get_bits(gbc, 2); | |
423 | } | ||
424 | } | ||
425 | } else { | ||
426 | /* LUT-based exponent strategy syntax */ | ||
427 |
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4185 | for (ch = !((s->channel_mode > 1) && num_cpl_blocks); ch <= s->fbw_channels; ch++) { |
428 | 3079 | int frmchexpstr = get_bits(gbc, 5); | |
429 |
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21553 | for (blk = 0; blk < 6; blk++) { |
430 | 18474 | s->exp_strategy[blk][ch] = ff_eac3_frm_expstr[frmchexpstr][blk]; | |
431 | } | ||
432 | } | ||
433 | } | ||
434 | /* LFE exponent strategy */ | ||
435 |
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1204 | if (s->lfe_on) { |
436 |
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532 | for (blk = 0; blk < s->num_blocks; blk++) { |
437 | 386 | s->exp_strategy[blk][s->lfe_ch] = get_bits1(gbc); | |
438 | } | ||
439 | } | ||
440 | /* original exponent strategies if this stream was converted from AC-3 */ | ||
441 |
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1204 | if (s->frame_type == EAC3_FRAME_TYPE_INDEPENDENT && |
442 |
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1045 | (s->num_blocks == 6 || get_bits1(gbc))) { |
443 | 963 | skip_bits(gbc, 5 * s->fbw_channels); // skip converter channel exponent strategy | |
444 | } | ||
445 | |||
446 | /* determine which channels use AHT */ | ||
447 |
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1204 | if (parse_aht_info) { |
448 | /* For AHT to be used, all non-zero blocks must reuse exponents from | ||
449 | the first block. Furthermore, for AHT to be used in the coupling | ||
450 | channel, all blocks must use coupling and use the same coupling | ||
451 | strategy. */ | ||
452 | 448 | s->channel_uses_aht[CPL_CH]=0; | |
453 |
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1536 | for (ch = (num_cpl_blocks != 6); ch <= s->channels; ch++) { |
454 | 1088 | int use_aht = 1; | |
455 |
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5550 | for (blk = 1; blk < 6; blk++) { |
456 |
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4734 | if ((s->exp_strategy[blk][ch] != EXP_REUSE) || |
457 | ✗ | (!ch && s->cpl_strategy_exists[blk])) { | |
458 | 272 | use_aht = 0; | |
459 | 272 | break; | |
460 | } | ||
461 | } | ||
462 |
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1088 | s->channel_uses_aht[ch] = use_aht && get_bits1(gbc); |
463 | } | ||
464 | } else { | ||
465 | 756 | memset(s->channel_uses_aht, 0, sizeof(s->channel_uses_aht)); | |
466 | } | ||
467 | |||
468 | /* per-frame SNR offset */ | ||
469 |
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1204 | if (!s->snr_offset_strategy) { |
470 | 1204 | int csnroffst = (get_bits(gbc, 6) - 15) << 4; | |
471 | 1204 | int snroffst = (csnroffst + get_bits(gbc, 4)) << 2; | |
472 |
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5718 | for (ch = 0; ch <= s->channels; ch++) |
473 | 4514 | s->snr_offset[ch] = snroffst; | |
474 | } | ||
475 | |||
476 | /* transient pre-noise processing data */ | ||
477 |
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1204 | if (parse_transient_proc_info) { |
478 | ✗ | for (ch = 1; ch <= s->fbw_channels; ch++) { | |
479 | ✗ | if (get_bits1(gbc)) { // channel in transient processing | |
480 | ✗ | skip_bits(gbc, 10); // skip transient processing location | |
481 | ✗ | skip_bits(gbc, 8); // skip transient processing length | |
482 | } | ||
483 | } | ||
484 | } | ||
485 | |||
486 | /* spectral extension attenuation data */ | ||
487 |
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4368 | for (ch = 1; ch <= s->fbw_channels; ch++) { |
488 |
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3164 | if (parse_spx_atten_data && get_bits1(gbc)) { |
489 | 1055 | s->spx_atten_code[ch] = get_bits(gbc, 5); | |
490 | } else { | ||
491 | 2109 | s->spx_atten_code[ch] = -1; | |
492 | } | ||
493 | } | ||
494 | |||
495 | /* block start information */ | ||
496 |
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1204 | if (s->num_blocks > 1 && get_bits1(gbc)) { |
497 | /* reference: Section E2.3.2.27 | ||
498 | nblkstrtbits = (numblks - 1) * (4 + ceiling(log2(words_per_frame))) | ||
499 | The spec does not say what this data is or what it's used for. | ||
500 | It is likely the offset of each block within the frame. */ | ||
501 | ✗ | int block_start_bits = (s->num_blocks-1) * (4 + av_log2(s->frame_size-2)); | |
502 | ✗ | skip_bits_long(gbc, block_start_bits); | |
503 | ✗ | avpriv_request_sample(s->avctx, "Block start info"); | |
504 | } | ||
505 | |||
506 | /* syntax state initialization */ | ||
507 |
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4368 | for (ch = 1; ch <= s->fbw_channels; ch++) { |
508 | 3164 | s->first_spx_coords[ch] = 1; | |
509 | 3164 | s->first_cpl_coords[ch] = 1; | |
510 | } | ||
511 | 1204 | s->first_cpl_leak = 1; | |
512 | |||
513 | 1204 | return 0; | |
514 | } | ||
515 |