37bdb5f390f488d9bcb0bbe4f3f9d4f74408039d
[libav.git] / libavcodec / mpc7.c
1 /*
2 * Musepack SV7 decoder
3 * Copyright (c) 2006 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 mpc7.c Musepack SV7 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 "mpc7data.h"
40
41 #define BANDS 32
42 #define SAMPLES_PER_BAND 36
43 #define MPC_FRAME_SIZE (BANDS * SAMPLES_PER_BAND)
44
45 static VLC scfi_vlc, dscf_vlc, hdr_vlc, quant_vlc[MPC7_QUANT_VLC_TABLES][2];
46
47 static int mpc7_decode_init(AVCodecContext * avctx)
48 {
49 int i, j;
50 MPCContext *c = avctx->priv_data;
51 GetBitContext gb;
52 uint8_t buf[16];
53 static int vlc_initialized = 0;
54
55 if(avctx->extradata_size < 16){
56 av_log(avctx, AV_LOG_ERROR, "Too small extradata size (%i)!\n", avctx->extradata_size);
57 return -1;
58 }
59 memset(c->oldDSCF, 0, sizeof(c->oldDSCF));
60 av_init_random(0xDEADBEEF, &c->rnd);
61 dsputil_init(&c->dsp, avctx);
62 c->dsp.bswap_buf((uint32_t*)buf, (const uint32_t*)avctx->extradata, 4);
63 ff_mpc_init();
64 init_get_bits(&gb, buf, 128);
65
66 c->IS = get_bits1(&gb);
67 c->MSS = get_bits1(&gb);
68 c->maxbands = get_bits(&gb, 6);
69 if(c->maxbands >= BANDS){
70 av_log(avctx, AV_LOG_ERROR, "Too many bands: %i\n", c->maxbands);
71 return -1;
72 }
73 skip_bits(&gb, 88);
74 c->gapless = get_bits1(&gb);
75 c->lastframelen = get_bits(&gb, 11);
76 av_log(avctx, AV_LOG_DEBUG, "IS: %d, MSS: %d, TG: %d, LFL: %d, bands: %d\n",
77 c->IS, c->MSS, c->gapless, c->lastframelen, c->maxbands);
78 c->frames_to_skip = 0;
79
80 if(vlc_initialized) return 0;
81 av_log(avctx, AV_LOG_DEBUG, "Initing VLC\n");
82 if(init_vlc(&scfi_vlc, MPC7_SCFI_BITS, MPC7_SCFI_SIZE,
83 &mpc7_scfi[1], 2, 1,
84 &mpc7_scfi[0], 2, 1, INIT_VLC_USE_STATIC)){
85 av_log(avctx, AV_LOG_ERROR, "Cannot init SCFI VLC\n");
86 return -1;
87 }
88 if(init_vlc(&dscf_vlc, MPC7_DSCF_BITS, MPC7_DSCF_SIZE,
89 &mpc7_dscf[1], 2, 1,
90 &mpc7_dscf[0], 2, 1, INIT_VLC_USE_STATIC)){
91 av_log(avctx, AV_LOG_ERROR, "Cannot init DSCF VLC\n");
92 return -1;
93 }
94 if(init_vlc(&hdr_vlc, MPC7_HDR_BITS, MPC7_HDR_SIZE,
95 &mpc7_hdr[1], 2, 1,
96 &mpc7_hdr[0], 2, 1, INIT_VLC_USE_STATIC)){
97 av_log(avctx, AV_LOG_ERROR, "Cannot init HDR VLC\n");
98 return -1;
99 }
100 for(i = 0; i < MPC7_QUANT_VLC_TABLES; i++){
101 for(j = 0; j < 2; j++){
102 if(init_vlc(&quant_vlc[i][j], 9, mpc7_quant_vlc_sizes[i],
103 &mpc7_quant_vlc[i][j][1], 4, 2,
104 &mpc7_quant_vlc[i][j][0], 4, 2, INIT_VLC_USE_STATIC)){
105 av_log(avctx, AV_LOG_ERROR, "Cannot init QUANT VLC %i,%i\n",i,j);
106 return -1;
107 }
108 }
109 }
110 vlc_initialized = 1;
111 return 0;
112 }
113
114 /**
115 * Fill samples for given subband
116 */
117 static inline void idx_to_quant(MPCContext *c, GetBitContext *gb, int idx, int *dst)
118 {
119 int i, i1, t;
120 switch(idx){
121 case -1:
122 for(i = 0; i < SAMPLES_PER_BAND; i++){
123 *dst++ = (av_random(&c->rnd) & 0x3FC) - 510;
124 }
125 break;
126 case 1:
127 i1 = get_bits1(gb);
128 for(i = 0; i < SAMPLES_PER_BAND/3; i++){
129 t = get_vlc2(gb, quant_vlc[0][i1].table, 9, 2);
130 *dst++ = mpc7_idx30[t];
131 *dst++ = mpc7_idx31[t];
132 *dst++ = mpc7_idx32[t];
133 }
134 break;
135 case 2:
136 i1 = get_bits1(gb);
137 for(i = 0; i < SAMPLES_PER_BAND/2; i++){
138 t = get_vlc2(gb, quant_vlc[1][i1].table, 9, 2);
139 *dst++ = mpc7_idx50[t];
140 *dst++ = mpc7_idx51[t];
141 }
142 break;
143 case 3: case 4: case 5: case 6: case 7:
144 i1 = get_bits1(gb);
145 for(i = 0; i < SAMPLES_PER_BAND; i++)
146 *dst++ = get_vlc2(gb, quant_vlc[idx-1][i1].table, 9, 2) - mpc7_quant_vlc_off[idx-1];
147 break;
148 case 8: case 9: case 10: case 11: case 12:
149 case 13: case 14: case 15: case 16: case 17:
150 t = (1 << (idx - 2)) - 1;
151 for(i = 0; i < SAMPLES_PER_BAND; i++)
152 *dst++ = get_bits(gb, idx - 1) - t;
153 break;
154 default: // case 0 and -2..-17
155 return;
156 }
157 }
158
159 static int mpc7_decode_frame(AVCodecContext * avctx,
160 void *data, int *data_size,
161 const uint8_t * buf, int buf_size)
162 {
163 MPCContext *c = avctx->priv_data;
164 GetBitContext gb;
165 uint8_t *bits;
166 int i, ch, t;
167 int mb = -1;
168 Band *bands = c->bands;
169 int off;
170 int bits_used, bits_avail;
171
172 memset(bands, 0, sizeof(bands));
173 if(buf_size <= 4){
174 av_log(avctx, AV_LOG_ERROR, "Too small buffer passed (%i bytes)\n", buf_size);
175 }
176
177 bits = av_malloc(((buf_size - 1) & ~3) + FF_INPUT_BUFFER_PADDING_SIZE);
178 c->dsp.bswap_buf((uint32_t*)bits, (const uint32_t*)(buf + 4), (buf_size - 4) >> 2);
179 init_get_bits(&gb, bits, (buf_size - 4)* 8);
180 skip_bits(&gb, buf[0]);
181
182 /* read subband indexes */
183 for(i = 0; i <= c->maxbands; i++){
184 for(ch = 0; ch < 2; ch++){
185 if(i) t = get_vlc2(&gb, hdr_vlc.table, MPC7_HDR_BITS, 1) - 5;
186 if(!i || (t == 4)) bands[i].res[ch] = get_bits(&gb, 4);
187 else bands[i].res[ch] = bands[i-1].res[ch] + t;
188 }
189
190 if(bands[i].res[0] || bands[i].res[1]){
191 mb = i;
192 if(c->MSS) bands[i].msf = get_bits1(&gb);
193 }
194 }
195 /* get scale indexes coding method */
196 for(i = 0; i <= mb; i++)
197 for(ch = 0; ch < 2; ch++)
198 if(bands[i].res[ch]) bands[i].scfi[ch] = get_vlc2(&gb, scfi_vlc.table, MPC7_SCFI_BITS, 1);
199 /* get scale indexes */
200 for(i = 0; i <= mb; i++){
201 for(ch = 0; ch < 2; ch++){
202 if(bands[i].res[ch]){
203 bands[i].scf_idx[ch][2] = c->oldDSCF[ch][i];
204 t = get_vlc2(&gb, dscf_vlc.table, MPC7_DSCF_BITS, 1) - 7;
205 bands[i].scf_idx[ch][0] = (t == 8) ? get_bits(&gb, 6) : (bands[i].scf_idx[ch][2] + t);
206 switch(bands[i].scfi[ch]){
207 case 0:
208 t = get_vlc2(&gb, dscf_vlc.table, MPC7_DSCF_BITS, 1) - 7;
209 bands[i].scf_idx[ch][1] = (t == 8) ? get_bits(&gb, 6) : (bands[i].scf_idx[ch][0] + t);
210 t = get_vlc2(&gb, dscf_vlc.table, MPC7_DSCF_BITS, 1) - 7;
211 bands[i].scf_idx[ch][2] = (t == 8) ? get_bits(&gb, 6) : (bands[i].scf_idx[ch][1] + t);
212 break;
213 case 1:
214 t = get_vlc2(&gb, dscf_vlc.table, MPC7_DSCF_BITS, 1) - 7;
215 bands[i].scf_idx[ch][1] = (t == 8) ? get_bits(&gb, 6) : (bands[i].scf_idx[ch][0] + t);
216 bands[i].scf_idx[ch][2] = bands[i].scf_idx[ch][1];
217 break;
218 case 2:
219 bands[i].scf_idx[ch][1] = bands[i].scf_idx[ch][0];
220 t = get_vlc2(&gb, dscf_vlc.table, MPC7_DSCF_BITS, 1) - 7;
221 bands[i].scf_idx[ch][2] = (t == 8) ? get_bits(&gb, 6) : (bands[i].scf_idx[ch][1] + t);
222 break;
223 case 3:
224 bands[i].scf_idx[ch][2] = bands[i].scf_idx[ch][1] = bands[i].scf_idx[ch][0];
225 break;
226 }
227 c->oldDSCF[ch][i] = bands[i].scf_idx[ch][2];
228 }
229 }
230 }
231 /* get quantizers */
232 memset(c->Q, 0, sizeof(c->Q));
233 off = 0;
234 for(i = 0; i < BANDS; i++, off += SAMPLES_PER_BAND)
235 for(ch = 0; ch < 2; ch++)
236 idx_to_quant(c, &gb, bands[i].res[ch], c->Q[ch] + off);
237
238 ff_mpc_dequantize_and_synth(c, mb, data);
239
240 av_free(bits);
241
242 bits_used = get_bits_count(&gb);
243 bits_avail = (buf_size - 4) * 8;
244 if(!buf[1] && ((bits_avail < bits_used) || (bits_used + 32 <= bits_avail))){
245 av_log(NULL,0, "Error decoding frame: used %i of %i bits\n", bits_used, bits_avail);
246 return -1;
247 }
248 if(c->frames_to_skip){
249 c->frames_to_skip--;
250 *data_size = 0;
251 return buf_size;
252 }
253 *data_size = (buf[1] ? c->lastframelen : MPC_FRAME_SIZE) * 4;
254
255 return buf_size;
256 }
257
258 static void mpc7_decode_flush(AVCodecContext *avctx)
259 {
260 MPCContext *c = avctx->priv_data;
261
262 memset(c->oldDSCF, 0, sizeof(c->oldDSCF));
263 c->frames_to_skip = 32;
264 }
265
266 AVCodec mpc7_decoder = {
267 "mpc sv7",
268 CODEC_TYPE_AUDIO,
269 CODEC_ID_MUSEPACK7,
270 sizeof(MPCContext),
271 mpc7_decode_init,
272 NULL,
273 NULL,
274 mpc7_decode_frame,
275 .flush = mpc7_decode_flush,
276 };