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1 | /* | ||
2 | * Musepack SV8 decoder | ||
3 | * Copyright (c) 2007 Konstantin Shishkov | ||
4 | * | ||
5 | * This file is part of FFmpeg. | ||
6 | * | ||
7 | * FFmpeg is free software; you can redistribute it and/or | ||
8 | * modify it under the terms of the GNU Lesser General Public | ||
9 | * License as published by the Free Software Foundation; either | ||
10 | * version 2.1 of the License, or (at your option) any later version. | ||
11 | * | ||
12 | * FFmpeg is distributed in the hope that it will be useful, | ||
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
15 | * Lesser General Public License for more details. | ||
16 | * | ||
17 | * You should have received a copy of the GNU Lesser General Public | ||
18 | * License along with FFmpeg; if not, write to the Free Software | ||
19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
20 | */ | ||
21 | |||
22 | /** | ||
23 | * @file | ||
24 | * MPEG Audio Layer 1/2 -like codec with frames of 1152 samples | ||
25 | * divided into 32 subbands. | ||
26 | */ | ||
27 | |||
28 | #include "libavutil/channel_layout.h" | ||
29 | #include "libavutil/lfg.h" | ||
30 | #include "libavutil/thread.h" | ||
31 | #include "avcodec.h" | ||
32 | #include "codec_internal.h" | ||
33 | #include "decode.h" | ||
34 | #include "get_bits.h" | ||
35 | #include "mpegaudiodsp.h" | ||
36 | |||
37 | #include "mpc.h" | ||
38 | #include "mpc8data.h" | ||
39 | #include "mpc8huff.h" | ||
40 | |||
41 | static VLC band_vlc, scfi_vlc[2], dscf_vlc[2], res_vlc[2]; | ||
42 | static VLC q1_vlc, q2_vlc[2], q3_vlc[2], quant_vlc[4][2], q9up_vlc; | ||
43 | |||
44 | 7797 | static inline int mpc8_dec_base(GetBitContext *gb, int k, int n) | |
45 | { | ||
46 | 7797 | int len = mpc8_cnk_len[k-1][n-1] - 1; | |
47 |
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7797 | int code = len ? get_bits_long(gb, len) : 0; |
48 | |||
49 |
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7797 | if (code >= mpc8_cnk_lost[k-1][n-1]) |
50 | 3746 | code = ((code << 1) | get_bits1(gb)) - mpc8_cnk_lost[k-1][n-1]; | |
51 | |||
52 | 7797 | return code; | |
53 | } | ||
54 | |||
55 | 7335 | static inline int mpc8_dec_enum(GetBitContext *gb, int k, int n) | |
56 | { | ||
57 | 7335 | int bits = 0; | |
58 | 7335 | const uint32_t * C = mpc8_cnk[k-1]; | |
59 | 7335 | int code = mpc8_dec_base(gb, k, n); | |
60 | |||
61 | do { | ||
62 | 109711 | n--; | |
63 |
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109711 | if (code >= C[n]) { |
64 | 41077 | bits |= 1U << n; | |
65 | 41077 | code -= C[n]; | |
66 | 41077 | C -= 32; | |
67 | 41077 | k--; | |
68 | } | ||
69 |
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109711 | } while(k > 0); |
70 | |||
71 | 7335 | return bits; | |
72 | } | ||
73 | |||
74 | 462 | static inline int mpc8_get_mod_golomb(GetBitContext *gb, int m) | |
75 | { | ||
76 |
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462 | if(mpc8_cnk_len[0][m] < 1) return 0; |
77 | 462 | return mpc8_dec_base(gb, 1, m+1); | |
78 | } | ||
79 | |||
80 | 7492 | static int mpc8_get_mask(GetBitContext *gb, int size, int t) | |
81 | { | ||
82 | 7492 | int mask = 0; | |
83 | |||
84 |
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7492 | if(t && t != size) |
85 | 7335 | mask = mpc8_dec_enum(gb, FFMIN(t, size - t), size); | |
86 |
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7492 | if((t << 1) > size) mask = ~mask; |
87 | |||
88 | 7492 | return mask; | |
89 | } | ||
90 | |||
91 | 42 | static av_cold void build_vlc(VLC *vlc, unsigned *buf_offset, | |
92 | const uint8_t codes_counts[16], | ||
93 | const uint8_t **syms, int offset) | ||
94 | { | ||
95 | static VLCElem vlc_buf[9296]; | ||
96 | uint8_t len[MPC8_MAX_VLC_SIZE]; | ||
97 | 42 | unsigned num = 0; | |
98 | |||
99 | 42 | vlc->table = &vlc_buf[*buf_offset]; | |
100 | 42 | vlc->table_allocated = FF_ARRAY_ELEMS(vlc_buf) - *buf_offset; | |
101 | |||
102 |
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714 | for (int i = 16; i > 0; i--) |
103 |
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3358 | for (unsigned tmp = num + codes_counts[i - 1]; num < tmp; num++) |
104 | 2686 | len[num] = i; | |
105 | |||
106 | 42 | ff_vlc_init_from_lengths(vlc, FFMIN(len[0], 9), num, len, 1, | |
107 | *syms, 1, 1, offset, VLC_INIT_STATIC_OVERLONG, NULL); | ||
108 | 42 | *buf_offset += vlc->table_size; | |
109 | 42 | *syms += num; | |
110 | 42 | } | |
111 | |||
112 | 2 | static av_cold void mpc8_init_static(void) | |
113 | { | ||
114 | 2 | const uint8_t *q_syms = mpc8_q_syms, *bands_syms = mpc8_bands_syms; | |
115 | 2 | const uint8_t *res_syms = mpc8_res_syms, *scfi_syms = mpc8_scfi_syms; | |
116 | 2 | const uint8_t *dscf_syms = mpc8_dscf_syms; | |
117 | 2 | unsigned offset = 0; | |
118 | |||
119 | 2 | build_vlc(&band_vlc, &offset, mpc8_bands_len_counts, &bands_syms, 0); | |
120 | |||
121 | 2 | build_vlc(&q1_vlc, &offset, mpc8_q1_len_counts, &q_syms, 0); | |
122 | 2 | build_vlc(&q9up_vlc, &offset, mpc8_q9up_len_counts, &q_syms, 0); | |
123 | |||
124 |
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6 | for (int i = 0; i < 2; i++){ |
125 | 4 | build_vlc(&scfi_vlc[i], &offset, mpc8_scfi_len_counts[i], &scfi_syms, 0); | |
126 | |||
127 | 4 | build_vlc(&dscf_vlc[i], &offset, mpc8_dscf_len_counts[i], &dscf_syms, 0); | |
128 | |||
129 | 4 | build_vlc(&res_vlc[i], &offset, mpc8_res_len_counts[i], &res_syms, 0); | |
130 | |||
131 | 4 | build_vlc(&q2_vlc[i], &offset, mpc8_q2_len_counts[i], &q_syms, 0); | |
132 | 4 | build_vlc(&q3_vlc[i], &offset, mpc8_q34_len_counts[i], | |
133 | 4 | &q_syms, -48 - 16 * i); | |
134 |
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20 | for (int j = 0; j < 4; j++) |
135 | 16 | build_vlc(&quant_vlc[j][i], &offset, mpc8_q5_8_len_counts[i][j], | |
136 | 16 | &q_syms, -((8 << j) - 1)); | |
137 | } | ||
138 | 2 | ff_mpa_synth_init_fixed(); | |
139 | 2 | } | |
140 | |||
141 | 3 | static av_cold int mpc8_decode_init(AVCodecContext * avctx) | |
142 | { | ||
143 | static AVOnce init_static_once = AV_ONCE_INIT; | ||
144 | 3 | MPCContext *c = avctx->priv_data; | |
145 | GetBitContext gb; | ||
146 | int channels; | ||
147 | |||
148 |
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3 | if(avctx->extradata_size < 2){ |
149 | ✗ | av_log(avctx, AV_LOG_ERROR, "Too small extradata size (%i)!\n", avctx->extradata_size); | |
150 | ✗ | return -1; | |
151 | } | ||
152 | 3 | memset(c->oldDSCF, 0, sizeof(c->oldDSCF)); | |
153 | 3 | av_lfg_init(&c->rnd, 0xDEADBEEF); | |
154 | 3 | ff_mpadsp_init(&c->mpadsp); | |
155 | |||
156 | 3 | init_get_bits(&gb, avctx->extradata, 16); | |
157 | |||
158 | 3 | uint8_t sample_rate_idx = get_bits(&gb, 3); | |
159 | static const int sample_rates[] = { 44100, 48000, 37800, 32000 }; | ||
160 |
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3 | if (sample_rate_idx >= FF_ARRAY_ELEMS(sample_rates)) { |
161 | ✗ | av_log(avctx, AV_LOG_ERROR, "invalid sample rate index (%u)\n", sample_rate_idx); | |
162 | ✗ | return AVERROR_INVALIDDATA; | |
163 | } | ||
164 | 3 | avctx->sample_rate = sample_rates[sample_rate_idx]; | |
165 | 3 | c->maxbands = get_bits(&gb, 5) + 1; | |
166 |
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3 | if (c->maxbands >= BANDS) { |
167 | ✗ | av_log(avctx,AV_LOG_ERROR, "maxbands %d too high\n", c->maxbands); | |
168 | ✗ | return AVERROR_INVALIDDATA; | |
169 | } | ||
170 | 3 | channels = get_bits(&gb, 4) + 1; | |
171 |
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3 | if (channels > 2) { |
172 | ✗ | avpriv_request_sample(avctx, "Multichannel MPC SV8"); | |
173 | ✗ | return AVERROR_PATCHWELCOME; | |
174 | } | ||
175 | 3 | c->MSS = get_bits1(&gb); | |
176 | 3 | c->frames = 1 << (get_bits(&gb, 3) * 2); | |
177 | |||
178 | 3 | avctx->sample_fmt = AV_SAMPLE_FMT_S16P; | |
179 | 3 | av_channel_layout_uninit(&avctx->ch_layout); | |
180 | 3 | av_channel_layout_default(&avctx->ch_layout, channels); | |
181 | |||
182 | 3 | ff_thread_once(&init_static_once, mpc8_init_static); | |
183 | |||
184 | 3 | return 0; | |
185 | } | ||
186 | |||
187 | 459 | static int mpc8_decode_frame(AVCodecContext *avctx, AVFrame *frame, | |
188 | int *got_frame_ptr, AVPacket *avpkt) | ||
189 | { | ||
190 | 459 | const uint8_t *buf = avpkt->data; | |
191 | 459 | int buf_size = avpkt->size; | |
192 | 459 | MPCContext *c = avctx->priv_data; | |
193 | 459 | GetBitContext gb2, *gb = &gb2; | |
194 | int i, j, k, ch, cnt, res, t; | ||
195 | 459 | Band *bands = c->bands; | |
196 | int off; | ||
197 | int maxband, keyframe; | ||
198 | int last[2]; | ||
199 | |||
200 | 459 | keyframe = c->cur_frame == 0; | |
201 | |||
202 |
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459 | if(keyframe){ |
203 | 10 | memset(c->Q, 0, sizeof(c->Q)); | |
204 | 10 | c->last_bits_used = 0; | |
205 | } | ||
206 |
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459 | if ((res = init_get_bits8(gb, buf, buf_size)) < 0) |
207 | ✗ | return res; | |
208 | |||
209 | 459 | skip_bits(gb, c->last_bits_used & 7); | |
210 | |||
211 |
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459 | if(keyframe) |
212 | 10 | maxband = mpc8_get_mod_golomb(gb, c->maxbands + 1); | |
213 | else{ | ||
214 | 449 | maxband = c->last_max_band + get_vlc2(gb, band_vlc.table, MPC8_BANDS_BITS, 2); | |
215 |
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449 | if(maxband > 32) maxband -= 33; |
216 | } | ||
217 | |||
218 |
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459 | if (get_bits_left(gb) < 0) { |
219 | 1 | *got_frame_ptr = 0; | |
220 | 1 | return buf_size; | |
221 | } | ||
222 | |||
223 |
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458 | if(maxband > c->maxbands + 1) { |
224 | ✗ | av_log(avctx, AV_LOG_ERROR, "maxband %d too large\n",maxband); | |
225 | ✗ | return AVERROR_INVALIDDATA; | |
226 | } | ||
227 | 458 | c->last_max_band = maxband; | |
228 | |||
229 | /* read subband indexes */ | ||
230 |
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458 | if(maxband){ |
231 | 452 | last[0] = last[1] = 0; | |
232 |
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10866 | for(i = maxband - 1; i >= 0; i--){ |
233 |
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31242 | for(ch = 0; ch < 2; ch++){ |
234 | 20828 | last[ch] = get_vlc2(gb, res_vlc[last[ch] > 2].table, MPC8_RES_BITS, 2) + last[ch]; | |
235 |
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20828 | if(last[ch] > 15) last[ch] -= 17; |
236 | 20828 | bands[i].res[ch] = last[ch]; | |
237 | } | ||
238 | } | ||
239 |
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452 | if(c->MSS){ |
240 | int mask; | ||
241 | |||
242 | 452 | cnt = 0; | |
243 |
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10866 | for(i = 0; i < maxband; i++) |
244 |
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10414 | if(bands[i].res[0] || bands[i].res[1]) |
245 | 10414 | cnt++; | |
246 | 452 | t = mpc8_get_mod_golomb(gb, cnt); | |
247 | 452 | mask = mpc8_get_mask(gb, cnt, t); | |
248 |
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10866 | for(i = maxband - 1; i >= 0; i--) |
249 |
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10414 | if(bands[i].res[0] || bands[i].res[1]){ |
250 | 10414 | bands[i].msf = mask & 1; | |
251 | 10414 | mask >>= 1; | |
252 | } | ||
253 | } | ||
254 | } | ||
255 |
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2868 | for(i = maxband; i < c->maxbands; i++) |
256 | 2410 | bands[i].res[0] = bands[i].res[1] = 0; | |
257 | |||
258 |
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458 | if(keyframe){ |
259 |
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330 | for(i = 0; i < 32; i++) |
260 | 320 | c->oldDSCF[0][i] = c->oldDSCF[1][i] = 1; | |
261 | } | ||
262 | |||
263 |
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10872 | for(i = 0; i < maxband; i++){ |
264 |
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10414 | if(bands[i].res[0] || bands[i].res[1]){ |
265 | 10414 | cnt = !!bands[i].res[0] + !!bands[i].res[1] - 1; | |
266 |
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10414 | if(cnt >= 0){ |
267 | 10414 | t = get_vlc2(gb, scfi_vlc[cnt].table, scfi_vlc[cnt].bits, 1); | |
268 |
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10414 | if(bands[i].res[0]) bands[i].scfi[0] = t >> (2 * cnt); |
269 |
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10414 | if(bands[i].res[1]) bands[i].scfi[1] = t & 3; |
270 | } | ||
271 | } | ||
272 | } | ||
273 | |||
274 |
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10872 | for(i = 0; i < maxband; i++){ |
275 |
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31242 | for(ch = 0; ch < 2; ch++){ |
276 |
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20828 | if(!bands[i].res[ch]) continue; |
277 | |||
278 |
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18282 | if(c->oldDSCF[ch][i]){ |
279 | 388 | bands[i].scf_idx[ch][0] = get_bits(gb, 7) - 6; | |
280 | 388 | c->oldDSCF[ch][i] = 0; | |
281 | }else{ | ||
282 | 17894 | t = get_vlc2(gb, dscf_vlc[1].table, MPC8_DSCF1_BITS, 2); | |
283 |
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17894 | if(t == 64) |
284 | 50 | t += get_bits(gb, 6); | |
285 | 17894 | bands[i].scf_idx[ch][0] = ((bands[i].scf_idx[ch][2] + t - 25) & 0x7F) - 6; | |
286 | } | ||
287 |
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54846 | for(j = 0; j < 2; j++){ |
288 |
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36564 | if((bands[i].scfi[ch] << j) & 2) |
289 | 23434 | bands[i].scf_idx[ch][j + 1] = bands[i].scf_idx[ch][j]; | |
290 | else{ | ||
291 | 13130 | t = get_vlc2(gb, dscf_vlc[0].table, MPC8_DSCF0_BITS, 2); | |
292 |
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13130 | if(t == 31) |
293 | 98 | t = 64 + get_bits(gb, 6); | |
294 | 13130 | bands[i].scf_idx[ch][j + 1] = ((bands[i].scf_idx[ch][j] + t - 25) & 0x7F) - 6; | |
295 | } | ||
296 | } | ||
297 | } | ||
298 | } | ||
299 | |||
300 |
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10872 | for(i = 0, off = 0; i < maxband; i++, off += SAMPLES_PER_BAND){ |
301 |
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31242 | for(ch = 0; ch < 2; ch++){ |
302 | 20828 | res = bands[i].res[ch]; | |
303 |
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20828 | switch(res){ |
304 | ✗ | case -1: | |
305 | ✗ | for(j = 0; j < SAMPLES_PER_BAND; j++) | |
306 | ✗ | c->Q[ch][off + j] = (av_lfg_get(&c->rnd) & 0x3FC) - 510; | |
307 | ✗ | break; | |
308 | 2546 | case 0: | |
309 | 2546 | break; | |
310 | 3520 | case 1: | |
311 |
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10560 | for(j = 0; j < SAMPLES_PER_BAND; j += SAMPLES_PER_BAND / 2){ |
312 | 7040 | cnt = get_vlc2(gb, q1_vlc.table, MPC8_Q1_BITS, 2); | |
313 | 7040 | t = mpc8_get_mask(gb, 18, cnt); | |
314 |
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133760 | for(k = 0; k < SAMPLES_PER_BAND / 2; k++) |
315 | 126720 | c->Q[ch][off + j + k] = t & (1 << (SAMPLES_PER_BAND / 2 - k - 1)) | |
316 |
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126720 | ? (get_bits1(gb) << 1) - 1 : 0; |
317 | } | ||
318 | 3520 | break; | |
319 | 6121 | case 2: | |
320 | 6121 | cnt = 6;//2*mpc8_thres[res] | |
321 |
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79573 | for(j = 0; j < SAMPLES_PER_BAND; j += 3){ |
322 | 73452 | t = get_vlc2(gb, q2_vlc[cnt > 3].table, MPC8_Q2_BITS, 2); | |
323 | 73452 | c->Q[ch][off + j + 0] = mpc8_idx50[t]; | |
324 | 73452 | c->Q[ch][off + j + 1] = mpc8_idx51[t]; | |
325 | 73452 | c->Q[ch][off + j + 2] = mpc8_idx52[t]; | |
326 | 73452 | cnt = (cnt >> 1) + mpc8_huffq2[t]; | |
327 | } | ||
328 | 6121 | break; | |
329 | 4822 | case 3: | |
330 | case 4: | ||
331 |
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91618 | for(j = 0; j < SAMPLES_PER_BAND; j += 2){ |
332 | 86796 | t = get_vlc2(gb, q3_vlc[res - 3].table, MPC8_Q3_BITS, 2); | |
333 | 86796 | c->Q[ch][off + j + 1] = t >> 4; | |
334 | 86796 | c->Q[ch][off + j + 0] = sign_extend(t, 4); | |
335 | } | ||
336 | 4822 | break; | |
337 | 3454 | case 5: | |
338 | case 6: | ||
339 | case 7: | ||
340 | case 8: | ||
341 | 3454 | cnt = 2 * mpc8_thres[res]; | |
342 |
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127798 | for(j = 0; j < SAMPLES_PER_BAND; j++){ |
343 | 124344 | const VLC *vlc = &quant_vlc[res - 5][cnt > mpc8_thres[res]]; | |
344 | 124344 | c->Q[ch][off + j] = get_vlc2(gb, vlc->table, vlc->bits, 2); | |
345 | 124344 | cnt = (cnt >> 1) + FFABS(c->Q[ch][off + j]); | |
346 | } | ||
347 | 3454 | break; | |
348 | 365 | default: | |
349 |
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13505 | for(j = 0; j < SAMPLES_PER_BAND; j++){ |
350 | 13140 | c->Q[ch][off + j] = get_vlc2(gb, q9up_vlc.table, MPC8_Q9UP_BITS, 2); | |
351 |
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13140 | if(res != 9){ |
352 | 5544 | c->Q[ch][off + j] <<= res - 9; | |
353 | 5544 | c->Q[ch][off + j] |= get_bits(gb, res - 9); | |
354 | } | ||
355 | 13140 | c->Q[ch][off + j] -= (1 << (res - 2)) - 1; | |
356 | } | ||
357 | } | ||
358 | } | ||
359 | } | ||
360 | |||
361 | 458 | frame->nb_samples = MPC_FRAME_SIZE; | |
362 |
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458 | if ((res = ff_get_buffer(avctx, frame, 0)) < 0) |
363 | ✗ | return res; | |
364 | |||
365 | 458 | ff_mpc_dequantize_and_synth(c, maxband - 1, | |
366 | 458 | (int16_t **)frame->extended_data, | |
367 | avctx->ch_layout.nb_channels); | ||
368 | |||
369 | 458 | c->cur_frame++; | |
370 | |||
371 | 458 | c->last_bits_used = get_bits_count(gb); | |
372 |
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458 | if(c->cur_frame >= c->frames) |
373 | 7 | c->cur_frame = 0; | |
374 |
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458 | if (get_bits_left(gb) < 0) { |
375 | ✗ | av_log(avctx, AV_LOG_ERROR, "Overread %d\n", -get_bits_left(gb)); | |
376 | ✗ | c->last_bits_used = buf_size << 3; | |
377 |
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458 | } else if (c->cur_frame == 0 && get_bits_left(gb) < 8) {// we have only padding left |
378 | 7 | c->last_bits_used = buf_size << 3; | |
379 | } | ||
380 | |||
381 | 458 | *got_frame_ptr = 1; | |
382 | |||
383 |
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458 | return c->cur_frame ? c->last_bits_used >> 3 : buf_size; |
384 | } | ||
385 | |||
386 | ✗ | static av_cold void mpc8_decode_flush(AVCodecContext *avctx) | |
387 | { | ||
388 | ✗ | MPCContext *c = avctx->priv_data; | |
389 | ✗ | c->cur_frame = 0; | |
390 | ✗ | } | |
391 | |||
392 | const FFCodec ff_mpc8_decoder = { | ||
393 | .p.name = "mpc8", | ||
394 | CODEC_LONG_NAME("Musepack SV8"), | ||
395 | .p.type = AVMEDIA_TYPE_AUDIO, | ||
396 | .p.id = AV_CODEC_ID_MUSEPACK8, | ||
397 | .priv_data_size = sizeof(MPCContext), | ||
398 | .init = mpc8_decode_init, | ||
399 | FF_CODEC_DECODE_CB(mpc8_decode_frame), | ||
400 | .flush = mpc8_decode_flush, | ||
401 | .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_CHANNEL_CONF, | ||
402 | CODEC_SAMPLEFMTS(AV_SAMPLE_FMT_S16P), | ||
403 | }; | ||
404 |