Musepack SV8 demuxer and decoder
[libav.git] / libavcodec / mpc8.c
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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 mpc8.c Musepack SV8 decoder
24 * MPEG Audio Layer 1/2 -like codec with frames of 1152 samples
25 * divided into 32 subbands.
26 */
27
28#include "avcodec.h"
29#include "bitstream.h"
30#include "dsputil.h"
31#include "random.h"
32
33#ifdef CONFIG_MPEGAUDIO_HP
34#define USE_HIGHPRECISION
35#endif
36#include "mpegaudio.h"
37
38#include "mpc.h"
39#include "mpcdata.h"
40#include "mpc8data.h"
41#include "mpc8huff.h"
42
43static VLC band_vlc, scfi_vlc[2], dscf_vlc[2], res_vlc[2];
44static VLC q1_vlc, q2_vlc[2], q3_vlc[2], quant_vlc[4][2], q9up_vlc;
45
46static const int q3_offsets[2] = { MPC8_Q3_OFFSET, MPC8_Q4_OFFSET };
47static const int quant_offsets[6] = { MPC8_Q5_OFFSET, MPC8_Q6_OFFSET, MPC8_Q7_OFFSET, MPC8_Q8_OFFSET };
48
49static inline int mpc8_dec_base(GetBitContext *gb, int k, int n)
50{
51 int code = get_bits(gb, mpc8_cnk_len[k-1][n-1] - 1);
52
53 if (code >= mpc8_cnk_lost[k-1][n-1])
54 code = ((code << 1) | get_bits1(gb)) - mpc8_cnk_lost[k-1][n-1];
55
56 return code;
57}
58
59static inline int mpc8_dec_enum(GetBitContext *gb, int k, int n)
60{
61 int bits = 0;
62 const uint32_t * C = mpc8_cnk[k-1];
63 int code = mpc8_dec_base(gb, k, n);
64
65 do {
66 n--;
67 if (code >= C[n]) {
68 bits |= 1 << n;
69 code -= C[n];
70 C -= 32;
71 k--;
72 }
73 } while(k > 0);
74
75 return bits;
76}
77
78static inline int mpc8_get_mod_golomb(GetBitContext *gb, int m)
79{
80 if(mpc8_cnk_len[0][m] < 1) return 0;
81 return mpc8_dec_base(gb, 1, m+1);
82}
83
84static int mpc8_get_mask(GetBitContext *gb, int size, int t)
85{
86 int mask = 0;
87
88 if(t && t != size)
89 mask = mpc8_dec_enum(gb, FFMIN(t, size - t), size);
90 if((t << 1) > size) mask = ~mask;
91
92 return mask;
93}
94
95static int mpc8_decode_init(AVCodecContext * avctx)
96{
97 int i;
98 MPCContext *c = avctx->priv_data;
99 GetBitContext gb;
100 static int vlc_inited = 0;
101
102 if(avctx->extradata_size < 2){
103 av_log(avctx, AV_LOG_ERROR, "Too small extradata size (%i)!\n", avctx->extradata_size);
104 return -1;
105 }
106 memset(c->oldDSCF, 0, sizeof(c->oldDSCF));
107 av_init_random(0xDEADBEEF, &c->rnd);
108 dsputil_init(&c->dsp, avctx);
109
110 ff_mpc_init();
111
112 init_get_bits(&gb, avctx->extradata, 16);
113
114 skip_bits(&gb, 3);//sample rate
115 c->maxbands = get_bits(&gb, 5) + 1;
116 skip_bits(&gb, 4);//channels
117 c->MSS = get_bits1(&gb);
118 c->frames = 1 << (get_bits(&gb, 3) * 2);
119
120 if(vlc_inited) return 0;
121 av_log(avctx, AV_LOG_DEBUG, "Initing VLC\n");
122
123 init_vlc(&band_vlc, MPC8_BANDS_BITS, MPC8_BANDS_SIZE,
124 mpc8_bands_bits, 1, 1,
125 mpc8_bands_codes, 1, 1, INIT_VLC_USE_STATIC);
126
127 init_vlc(&q1_vlc, MPC8_Q1_BITS, MPC8_Q1_SIZE,
128 mpc8_q1_bits, 1, 1,
129 mpc8_q1_codes, 1, 1, INIT_VLC_USE_STATIC);
130 init_vlc(&q9up_vlc, MPC8_Q9UP_BITS, MPC8_Q9UP_SIZE,
131 mpc8_q9up_bits, 1, 1,
132 mpc8_q9up_codes, 1, 1, INIT_VLC_USE_STATIC);
133
134 init_vlc(&scfi_vlc[0], MPC8_SCFI0_BITS, MPC8_SCFI0_SIZE,
135 mpc8_scfi0_bits, 1, 1,
136 mpc8_scfi0_codes, 1, 1, INIT_VLC_USE_STATIC);
137 init_vlc(&scfi_vlc[1], MPC8_SCFI1_BITS, MPC8_SCFI1_SIZE,
138 mpc8_scfi1_bits, 1, 1,
139 mpc8_scfi1_codes, 1, 1, INIT_VLC_USE_STATIC);
140
141 init_vlc(&dscf_vlc[0], MPC8_DSCF0_BITS, MPC8_DSCF0_SIZE,
142 mpc8_dscf0_bits, 1, 1,
143 mpc8_dscf0_codes, 1, 1, INIT_VLC_USE_STATIC);
144 init_vlc(&dscf_vlc[1], MPC8_DSCF1_BITS, MPC8_DSCF1_SIZE,
145 mpc8_dscf1_bits, 1, 1,
146 mpc8_dscf1_codes, 1, 1, INIT_VLC_USE_STATIC);
147
148 init_vlc_sparse(&q3_vlc[0], MPC8_Q3_BITS, MPC8_Q3_SIZE,
149 mpc8_q3_bits, 1, 1,
150 mpc8_q3_codes, 1, 1,
151 mpc8_q3_syms, 1, 1, INIT_VLC_USE_STATIC);
152 init_vlc_sparse(&q3_vlc[1], MPC8_Q4_BITS, MPC8_Q4_SIZE,
153 mpc8_q4_bits, 1, 1,
154 mpc8_q4_codes, 1, 1,
155 mpc8_q4_syms, 1, 1, INIT_VLC_USE_STATIC);
156
157 for(i = 0; i < 2; i++){
158 init_vlc(&res_vlc[i], MPC8_RES_BITS, MPC8_RES_SIZE,
159 &mpc8_res_bits[i], 1, 1,
160 &mpc8_res_codes[i], 1, 1, INIT_VLC_USE_STATIC);
161
162 init_vlc(&q2_vlc[i], MPC8_Q2_BITS, MPC8_Q2_SIZE,
163 &mpc8_q2_bits[i], 1, 1,
164 &mpc8_q2_codes[i], 1, 1, INIT_VLC_USE_STATIC);
165
166 init_vlc(&quant_vlc[0][i], MPC8_Q5_BITS, MPC8_Q5_SIZE,
167 &mpc8_q5_bits[i], 1, 1,
168 &mpc8_q5_codes[i], 1, 1, INIT_VLC_USE_STATIC);
169 init_vlc(&quant_vlc[1][i], MPC8_Q6_BITS, MPC8_Q6_SIZE,
170 &mpc8_q6_bits[i], 1, 1,
171 &mpc8_q6_codes[i], 1, 1, INIT_VLC_USE_STATIC);
172 init_vlc(&quant_vlc[2][i], MPC8_Q7_BITS, MPC8_Q7_SIZE,
173 &mpc8_q7_bits[i], 1, 1,
174 &mpc8_q7_codes[i], 1, 1, INIT_VLC_USE_STATIC);
175 init_vlc(&quant_vlc[3][i], MPC8_Q8_BITS, MPC8_Q8_SIZE,
176 &mpc8_q8_bits[i], 1, 1,
177 &mpc8_q8_codes[i], 1, 1, INIT_VLC_USE_STATIC);
178 }
179 vlc_inited = 1;
180 return 0;
181}
182
183static int mpc8_decode_frame(AVCodecContext * avctx,
184 void *data, int *data_size,
185 uint8_t * buf, int buf_size)
186{
187 MPCContext *c = avctx->priv_data;
188 GetBitContext gb2, *gb = &gb2;
189 int i, j, k, ch, cnt, res, t;
190 Band *bands = c->bands;
191 int off;
192 int maxband, keyframe;
193 int last[2];
194
195 keyframe = c->cur_frame == 0;
196
197 if(keyframe){
198 memset(c->Q, 0, sizeof(c->Q));
199 c->last_bits_used = 0;
200 }
201 init_get_bits(gb, buf, buf_size * 8);
202 skip_bits(gb, c->last_bits_used & 7);
203
204 if(keyframe)
205 maxband = mpc8_get_mod_golomb(gb, c->maxbands + 1);
206 else{
207 maxband = c->last_max_band + get_vlc2(gb, band_vlc.table, MPC8_BANDS_BITS, 2);
208 if(maxband > 32) maxband -= 33;
209 }
210 c->last_max_band = maxband;
211
212 /* read subband indexes */
213 if(maxband){
214 last[0] = last[1] = 0;
215 for(i = maxband - 1; i >= 0; i--){
216 for(ch = 0; ch < 2; ch++){
217 last[ch] = get_vlc2(gb, res_vlc[last[ch] > 2].table, MPC8_RES_BITS, 2) + last[ch];
218 if(last[ch] > 15) last[ch] -= 17;
219 bands[i].res[ch] = last[ch];
220 }
221 }
222 if(c->MSS){
223 int mask;
224
225 cnt = 0;
226 for(i = 0; i < maxband; i++)
227 if(bands[i].res[0] || bands[i].res[1])
228 cnt++;
229 t = mpc8_get_mod_golomb(gb, cnt);
230 mask = mpc8_get_mask(gb, cnt, t);
231 for(i = maxband - 1; i >= 0; i--)
232 if(bands[i].res[0] || bands[i].res[1]){
233 bands[i].msf = mask & 1;
234 mask >>= 1;
235 }
236 }
237 }
238 for(i = maxband; i < c->maxbands; i++)
239 bands[i].res[0] = bands[i].res[1] = 0;
240
241 if(keyframe){
242 for(i = 0; i < 32; i++)
243 c->oldDSCF[0][i] = c->oldDSCF[1][i] = 1;
244 }
245
246 for(i = 0; i < maxband; i++){
247 if(bands[i].res[0] || bands[i].res[1]){
248 cnt = !!bands[i].res[0] + !!bands[i].res[1] - 1;
249 if(cnt >= 0){
250 t = get_vlc2(gb, scfi_vlc[cnt].table, scfi_vlc[cnt].bits, 1);
251 if(bands[i].res[0]) bands[i].scfi[0] = t >> (2 * cnt);
252 if(bands[i].res[1]) bands[i].scfi[1] = t & 3;
253 }
254 }
255 }
256
257 for(i = 0; i < maxband; i++){
258 for(ch = 0; ch < 2; ch++){
259 if(!bands[i].res[ch]) continue;
260
261 if(c->oldDSCF[ch][i]){
262 bands[i].scf_idx[ch][0] = get_bits(gb, 7) - 6;
263 c->oldDSCF[ch][i] = 0;
264 }else{
265 t = get_vlc2(gb, dscf_vlc[1].table, MPC8_DSCF1_BITS, 2);
266 if(t == 64)
267 t += get_bits(gb, 6);
268 bands[i].scf_idx[ch][0] = ((bands[i].scf_idx[ch][2] + t - 25) & 0x7F) - 6;
269 }
270 for(j = 0; j < 2; j++){
271 if((bands[i].scfi[ch] << j) & 2)
272 bands[i].scf_idx[ch][j + 1] = bands[i].scf_idx[ch][j];
273 else{
274 t = get_vlc2(gb, dscf_vlc[0].table, MPC8_DSCF0_BITS, 2);
275 if(t == 31)
276 t = 64 + get_bits(gb, 6);
277 bands[i].scf_idx[ch][j + 1] = ((bands[i].scf_idx[ch][j] + t - 25) & 0x7F) - 6;
278 }
279 }
280 }
281 }
282
283 for(i = 0, off = 0; i < maxband; i++, off += SAMPLES_PER_BAND){
284 for(ch = 0; ch < 2; ch++){
285 res = bands[i].res[ch];
286 switch(res){
287 case -1:
288 for(j = 0; j < SAMPLES_PER_BAND; j++)
289 c->Q[ch][off + j] = (av_random(&c->rnd) & 0x3FC) - 510;
290 break;
291 case 0:
292 break;
293 case 1:
294 for(j = 0; j < SAMPLES_PER_BAND; j += SAMPLES_PER_BAND / 2){
295 cnt = get_vlc2(gb, q1_vlc.table, MPC8_Q1_BITS, 2);
296 t = mpc8_get_mask(gb, 18, cnt);
297 for(k = 0; k < SAMPLES_PER_BAND / 2; k++, t <<= 1)
298 c->Q[ch][off + j + k] = (t & 0x20000) ? (get_bits1(gb) << 1) - 1 : 0;
299 }
300 break;
301 case 2:
302 cnt = 6;//2*mpc8_thres[res]
303 for(j = 0; j < SAMPLES_PER_BAND; j += 3){
304 t = get_vlc2(gb, q2_vlc[cnt > 3].table, MPC8_Q2_BITS, 2);
305 c->Q[ch][off + j + 0] = mpc8_idx50[t];
306 c->Q[ch][off + j + 1] = mpc8_idx51[t];
307 c->Q[ch][off + j + 2] = mpc8_idx52[t];
308 cnt = (cnt >> 1) + mpc8_huffq2[t];
309 }
310 break;
311 case 3:
312 case 4:
313 for(j = 0; j < SAMPLES_PER_BAND; j += 2){
314 t = get_vlc2(gb, q3_vlc[res - 3].table, MPC8_Q3_BITS, 2) + q3_offsets[res - 3];
315 c->Q[ch][off + j + 1] = t >> 4;
316 c->Q[ch][off + j + 0] = (t & 8) ? (t & 0xF) - 16 : (t & 0xF);
317 }
318 break;
319 case 5:
320 case 6:
321 case 7:
322 case 8:
323 cnt = 2 * mpc8_thres[res];
324 for(j = 0; j < SAMPLES_PER_BAND; j++){
325 t = get_vlc2(gb, quant_vlc[res - 5][cnt > mpc8_thres[res]].table, quant_vlc[res - 5][cnt > mpc8_thres[res]].bits, 2) + quant_offsets[res - 5];
326 c->Q[ch][off + j] = t;
327 cnt = (cnt >> 1) + FFABS(c->Q[ch][off + j]);
328 }
329 break;
330 default:
331 for(j = 0; j < SAMPLES_PER_BAND; j++){
332 c->Q[ch][off + j] = get_vlc2(gb, q9up_vlc.table, MPC8_Q9UP_BITS, 2);
333 if(res != 9){
334 c->Q[ch][off + j] <<= res - 9;
335 c->Q[ch][off + j] |= get_bits(gb, res - 9);
336 }
337 c->Q[ch][off + j] -= (1 << (res - 2)) - 1;
338 }
339 }
340 }
341 }
342
343 ff_mpc_dequantize_and_synth(c, maxband, data);
344
345 c->cur_frame++;
346
347 c->last_bits_used = get_bits_count(gb);
348 if(c->cur_frame >= c->frames)
349 c->cur_frame = 0;
350 *data_size = MPC_FRAME_SIZE * 4;
351
352 return c->cur_frame ? c->last_bits_used >> 3 : buf_size;
353}
354
355AVCodec mpc8_decoder = {
356 "mpc sv8",
357 CODEC_TYPE_AUDIO,
358 CODEC_ID_MUSEPACK8,
359 sizeof(MPCContext),
360 mpc8_decode_init,
361 NULL,
362 NULL,
363 mpc8_decode_frame,
364};