7c9103c7d2227728c2c61e9371bc118e02a6cb8b
[libav.git] / libavcodec / mpc7.c
1 /*
2 * Musepack SV7 decoder
3 * Copyright (c) 2006 Konstantin Shishkov
4 *
5 * This file is part of Libav.
6 *
7 * Libav 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 * Libav 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 Libav; 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 "avcodec.h"
31 #include "get_bits.h"
32 #include "dsputil.h"
33 #include "mpegaudiodsp.h"
34
35 #include "mpc.h"
36 #include "mpc7data.h"
37
38 #define BANDS 32
39 #define SAMPLES_PER_BAND 36
40 #define MPC_FRAME_SIZE (BANDS * SAMPLES_PER_BAND)
41
42 static VLC scfi_vlc, dscf_vlc, hdr_vlc, quant_vlc[MPC7_QUANT_VLC_TABLES][2];
43
44 static const uint16_t quant_offsets[MPC7_QUANT_VLC_TABLES*2 + 1] =
45 {
46 0, 512, 1024, 1536, 2052, 2564, 3076, 3588, 4100, 4612, 5124,
47 5636, 6164, 6676, 7224
48 };
49
50
51 static av_cold int mpc7_decode_init(AVCodecContext * avctx)
52 {
53 int i, j;
54 MPCContext *c = avctx->priv_data;
55 GetBitContext gb;
56 LOCAL_ALIGNED_16(uint8_t, buf, [16]);
57 static int vlc_initialized = 0;
58
59 static VLC_TYPE scfi_table[1 << MPC7_SCFI_BITS][2];
60 static VLC_TYPE dscf_table[1 << MPC7_DSCF_BITS][2];
61 static VLC_TYPE hdr_table[1 << MPC7_HDR_BITS][2];
62 static VLC_TYPE quant_tables[7224][2];
63
64 /* Musepack SV7 is always stereo */
65 if (avctx->channels != 2) {
66 av_log_ask_for_sample(avctx, "Unsupported number of channels: %d\n",
67 avctx->channels);
68 return AVERROR_PATCHWELCOME;
69 }
70
71 if(avctx->extradata_size < 16){
72 av_log(avctx, AV_LOG_ERROR, "Too small extradata size (%i)!\n", avctx->extradata_size);
73 return -1;
74 }
75 memset(c->oldDSCF, 0, sizeof(c->oldDSCF));
76 av_lfg_init(&c->rnd, 0xDEADBEEF);
77 ff_dsputil_init(&c->dsp, avctx);
78 ff_mpadsp_init(&c->mpadsp);
79 c->dsp.bswap_buf((uint32_t*)buf, (const uint32_t*)avctx->extradata, 4);
80 ff_mpc_init();
81 init_get_bits(&gb, buf, 128);
82
83 c->IS = get_bits1(&gb);
84 c->MSS = get_bits1(&gb);
85 c->maxbands = get_bits(&gb, 6);
86 if(c->maxbands >= BANDS){
87 av_log(avctx, AV_LOG_ERROR, "Too many bands: %i\n", c->maxbands);
88 return -1;
89 }
90 skip_bits_long(&gb, 88);
91 c->gapless = get_bits1(&gb);
92 c->lastframelen = get_bits(&gb, 11);
93 av_log(avctx, AV_LOG_DEBUG, "IS: %d, MSS: %d, TG: %d, LFL: %d, bands: %d\n",
94 c->IS, c->MSS, c->gapless, c->lastframelen, c->maxbands);
95 c->frames_to_skip = 0;
96
97 avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
98 avctx->channel_layout = AV_CH_LAYOUT_STEREO;
99
100 if(vlc_initialized) return 0;
101 av_log(avctx, AV_LOG_DEBUG, "Initing VLC\n");
102 scfi_vlc.table = scfi_table;
103 scfi_vlc.table_allocated = 1 << MPC7_SCFI_BITS;
104 if(init_vlc(&scfi_vlc, MPC7_SCFI_BITS, MPC7_SCFI_SIZE,
105 &mpc7_scfi[1], 2, 1,
106 &mpc7_scfi[0], 2, 1, INIT_VLC_USE_NEW_STATIC)){
107 av_log(avctx, AV_LOG_ERROR, "Cannot init SCFI VLC\n");
108 return -1;
109 }
110 dscf_vlc.table = dscf_table;
111 dscf_vlc.table_allocated = 1 << MPC7_DSCF_BITS;
112 if(init_vlc(&dscf_vlc, MPC7_DSCF_BITS, MPC7_DSCF_SIZE,
113 &mpc7_dscf[1], 2, 1,
114 &mpc7_dscf[0], 2, 1, INIT_VLC_USE_NEW_STATIC)){
115 av_log(avctx, AV_LOG_ERROR, "Cannot init DSCF VLC\n");
116 return -1;
117 }
118 hdr_vlc.table = hdr_table;
119 hdr_vlc.table_allocated = 1 << MPC7_HDR_BITS;
120 if(init_vlc(&hdr_vlc, MPC7_HDR_BITS, MPC7_HDR_SIZE,
121 &mpc7_hdr[1], 2, 1,
122 &mpc7_hdr[0], 2, 1, INIT_VLC_USE_NEW_STATIC)){
123 av_log(avctx, AV_LOG_ERROR, "Cannot init HDR VLC\n");
124 return -1;
125 }
126 for(i = 0; i < MPC7_QUANT_VLC_TABLES; i++){
127 for(j = 0; j < 2; j++){
128 quant_vlc[i][j].table = &quant_tables[quant_offsets[i*2 + j]];
129 quant_vlc[i][j].table_allocated = quant_offsets[i*2 + j + 1] - quant_offsets[i*2 + j];
130 if(init_vlc(&quant_vlc[i][j], 9, mpc7_quant_vlc_sizes[i],
131 &mpc7_quant_vlc[i][j][1], 4, 2,
132 &mpc7_quant_vlc[i][j][0], 4, 2, INIT_VLC_USE_NEW_STATIC)){
133 av_log(avctx, AV_LOG_ERROR, "Cannot init QUANT VLC %i,%i\n",i,j);
134 return -1;
135 }
136 }
137 }
138 vlc_initialized = 1;
139
140 avcodec_get_frame_defaults(&c->frame);
141 avctx->coded_frame = &c->frame;
142
143 return 0;
144 }
145
146 /**
147 * Fill samples for given subband
148 */
149 static inline void idx_to_quant(MPCContext *c, GetBitContext *gb, int idx, int *dst)
150 {
151 int i, i1, t;
152 switch(idx){
153 case -1:
154 for(i = 0; i < SAMPLES_PER_BAND; i++){
155 *dst++ = (av_lfg_get(&c->rnd) & 0x3FC) - 510;
156 }
157 break;
158 case 1:
159 i1 = get_bits1(gb);
160 for(i = 0; i < SAMPLES_PER_BAND/3; i++){
161 t = get_vlc2(gb, quant_vlc[0][i1].table, 9, 2);
162 *dst++ = mpc7_idx30[t];
163 *dst++ = mpc7_idx31[t];
164 *dst++ = mpc7_idx32[t];
165 }
166 break;
167 case 2:
168 i1 = get_bits1(gb);
169 for(i = 0; i < SAMPLES_PER_BAND/2; i++){
170 t = get_vlc2(gb, quant_vlc[1][i1].table, 9, 2);
171 *dst++ = mpc7_idx50[t];
172 *dst++ = mpc7_idx51[t];
173 }
174 break;
175 case 3: case 4: case 5: case 6: case 7:
176 i1 = get_bits1(gb);
177 for(i = 0; i < SAMPLES_PER_BAND; i++)
178 *dst++ = get_vlc2(gb, quant_vlc[idx-1][i1].table, 9, 2) - mpc7_quant_vlc_off[idx-1];
179 break;
180 case 8: case 9: case 10: case 11: case 12:
181 case 13: case 14: case 15: case 16: case 17:
182 t = (1 << (idx - 2)) - 1;
183 for(i = 0; i < SAMPLES_PER_BAND; i++)
184 *dst++ = get_bits(gb, idx - 1) - t;
185 break;
186 default: // case 0 and -2..-17
187 return;
188 }
189 }
190
191 static int get_scale_idx(GetBitContext *gb, int ref)
192 {
193 int t = get_vlc2(gb, dscf_vlc.table, MPC7_DSCF_BITS, 1) - 7;
194 if (t == 8)
195 return get_bits(gb, 6);
196 return av_clip_uintp2(ref + t, 7);
197 }
198
199 static int mpc7_decode_frame(AVCodecContext * avctx, void *data,
200 int *got_frame_ptr, AVPacket *avpkt)
201 {
202 const uint8_t *buf = avpkt->data;
203 int buf_size;
204 MPCContext *c = avctx->priv_data;
205 GetBitContext gb;
206 int i, ch;
207 int mb = -1;
208 Band *bands = c->bands;
209 int off, ret, last_frame, skip;
210 int bits_used, bits_avail;
211
212 memset(bands, 0, sizeof(*bands) * (c->maxbands + 1));
213
214 buf_size = avpkt->size & ~3;
215 if (buf_size <= 0) {
216 av_log(avctx, AV_LOG_ERROR, "packet size is too small (%i bytes)\n",
217 avpkt->size);
218 return AVERROR_INVALIDDATA;
219 }
220 if (buf_size != avpkt->size) {
221 av_log(avctx, AV_LOG_WARNING, "packet size is not a multiple of 4. "
222 "extra bytes at the end will be skipped.\n");
223 }
224
225 skip = buf[0];
226 last_frame = buf[1];
227 buf += 4;
228 buf_size -= 4;
229
230 /* get output buffer */
231 c->frame.nb_samples = last_frame ? c->lastframelen : MPC_FRAME_SIZE;
232 if ((ret = avctx->get_buffer(avctx, &c->frame)) < 0) {
233 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
234 return ret;
235 }
236
237 av_fast_padded_malloc(&c->bits, &c->buf_size, buf_size);
238 if (!c->bits)
239 return AVERROR(ENOMEM);
240 c->dsp.bswap_buf((uint32_t *)c->bits, (const uint32_t *)buf, buf_size >> 2);
241 init_get_bits(&gb, c->bits, buf_size * 8);
242 skip_bits_long(&gb, skip);
243
244 /* read subband indexes */
245 for(i = 0; i <= c->maxbands; i++){
246 for(ch = 0; ch < 2; ch++){
247 int t = 4;
248 if(i) t = get_vlc2(&gb, hdr_vlc.table, MPC7_HDR_BITS, 1) - 5;
249 if(t == 4) bands[i].res[ch] = get_bits(&gb, 4);
250 else bands[i].res[ch] = av_clip(bands[i-1].res[ch] + t, 0, 17);
251 }
252
253 if(bands[i].res[0] || bands[i].res[1]){
254 mb = i;
255 if(c->MSS) bands[i].msf = get_bits1(&gb);
256 }
257 }
258 /* get scale indexes coding method */
259 for(i = 0; i <= mb; i++)
260 for(ch = 0; ch < 2; ch++)
261 if(bands[i].res[ch]) bands[i].scfi[ch] = get_vlc2(&gb, scfi_vlc.table, MPC7_SCFI_BITS, 1);
262 /* get scale indexes */
263 for(i = 0; i <= mb; i++){
264 for(ch = 0; ch < 2; ch++){
265 if(bands[i].res[ch]){
266 bands[i].scf_idx[ch][2] = c->oldDSCF[ch][i];
267 bands[i].scf_idx[ch][0] = get_scale_idx(&gb, bands[i].scf_idx[ch][2]);
268 switch(bands[i].scfi[ch]){
269 case 0:
270 bands[i].scf_idx[ch][1] = get_scale_idx(&gb, bands[i].scf_idx[ch][0]);
271 bands[i].scf_idx[ch][2] = get_scale_idx(&gb, bands[i].scf_idx[ch][1]);
272 break;
273 case 1:
274 bands[i].scf_idx[ch][1] = get_scale_idx(&gb, bands[i].scf_idx[ch][0]);
275 bands[i].scf_idx[ch][2] = bands[i].scf_idx[ch][1];
276 break;
277 case 2:
278 bands[i].scf_idx[ch][1] = bands[i].scf_idx[ch][0];
279 bands[i].scf_idx[ch][2] = get_scale_idx(&gb, bands[i].scf_idx[ch][1]);
280 break;
281 case 3:
282 bands[i].scf_idx[ch][2] = bands[i].scf_idx[ch][1] = bands[i].scf_idx[ch][0];
283 break;
284 }
285 c->oldDSCF[ch][i] = bands[i].scf_idx[ch][2];
286 }
287 }
288 }
289 /* get quantizers */
290 memset(c->Q, 0, sizeof(c->Q));
291 off = 0;
292 for(i = 0; i < BANDS; i++, off += SAMPLES_PER_BAND)
293 for(ch = 0; ch < 2; ch++)
294 idx_to_quant(c, &gb, bands[i].res[ch], c->Q[ch] + off);
295
296 ff_mpc_dequantize_and_synth(c, mb, (int16_t **)c->frame.extended_data, 2);
297
298 bits_used = get_bits_count(&gb);
299 bits_avail = buf_size * 8;
300 if (!last_frame && ((bits_avail < bits_used) || (bits_used + 32 <= bits_avail))) {
301 av_log(avctx, AV_LOG_ERROR, "Error decoding frame: used %i of %i bits\n", bits_used, bits_avail);
302 return -1;
303 }
304 if(c->frames_to_skip){
305 c->frames_to_skip--;
306 *got_frame_ptr = 0;
307 return avpkt->size;
308 }
309
310 *got_frame_ptr = 1;
311 *(AVFrame *)data = c->frame;
312
313 return avpkt->size;
314 }
315
316 static void mpc7_decode_flush(AVCodecContext *avctx)
317 {
318 MPCContext *c = avctx->priv_data;
319
320 memset(c->oldDSCF, 0, sizeof(c->oldDSCF));
321 c->frames_to_skip = 32;
322 }
323
324 static av_cold int mpc7_decode_close(AVCodecContext *avctx)
325 {
326 MPCContext *c = avctx->priv_data;
327 av_freep(&c->bits);
328 c->buf_size = 0;
329 return 0;
330 }
331
332 AVCodec ff_mpc7_decoder = {
333 .name = "mpc7",
334 .type = AVMEDIA_TYPE_AUDIO,
335 .id = AV_CODEC_ID_MUSEPACK7,
336 .priv_data_size = sizeof(MPCContext),
337 .init = mpc7_decode_init,
338 .close = mpc7_decode_close,
339 .decode = mpc7_decode_frame,
340 .flush = mpc7_decode_flush,
341 .capabilities = CODEC_CAP_DR1,
342 .long_name = NULL_IF_CONFIG_SMALL("Musepack SV7"),
343 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
344 AV_SAMPLE_FMT_NONE },
345 };