Imported Debian version 2.5.3~trusty1
[deb_ffmpeg.git] / ffmpeg / 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
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/internal.h"
30 #include "libavutil/lfg.h"
31 #include "avcodec.h"
32 #include "get_bits.h"
33 #include "internal.h"
34 #include "mpegaudiodsp.h"
35
36 #include "mpc.h"
37 #include "mpc7data.h"
38
39 static VLC scfi_vlc, dscf_vlc, hdr_vlc, quant_vlc[MPC7_QUANT_VLC_TABLES][2];
40
41 static const uint16_t quant_offsets[MPC7_QUANT_VLC_TABLES*2 + 1] =
42 {
43 0, 512, 1024, 1536, 2052, 2564, 3076, 3588, 4100, 4612, 5124,
44 5636, 6164, 6676, 7224
45 };
46
47
48 static av_cold int mpc7_decode_init(AVCodecContext * avctx)
49 {
50 int i, j;
51 MPCContext *c = avctx->priv_data;
52 GetBitContext gb;
53 LOCAL_ALIGNED_16(uint8_t, buf, [16]);
54 static int vlc_initialized = 0;
55
56 static VLC_TYPE scfi_table[1 << MPC7_SCFI_BITS][2];
57 static VLC_TYPE dscf_table[1 << MPC7_DSCF_BITS][2];
58 static VLC_TYPE hdr_table[1 << MPC7_HDR_BITS][2];
59 static VLC_TYPE quant_tables[7224][2];
60
61 /* Musepack SV7 is always stereo */
62 if (avctx->channels != 2) {
63 avpriv_request_sample(avctx, "%d channels", avctx->channels);
64 return AVERROR_PATCHWELCOME;
65 }
66
67 if(avctx->extradata_size < 16){
68 av_log(avctx, AV_LOG_ERROR, "Too small extradata size (%i)!\n", avctx->extradata_size);
69 return -1;
70 }
71 memset(c->oldDSCF, 0, sizeof(c->oldDSCF));
72 av_lfg_init(&c->rnd, 0xDEADBEEF);
73 ff_bswapdsp_init(&c->bdsp);
74 ff_mpadsp_init(&c->mpadsp);
75 c->bdsp.bswap_buf((uint32_t *) buf, (const uint32_t *) avctx->extradata, 4);
76 ff_mpc_init();
77 init_get_bits(&gb, buf, 128);
78
79 c->IS = get_bits1(&gb);
80 c->MSS = get_bits1(&gb);
81 c->maxbands = get_bits(&gb, 6);
82 if(c->maxbands >= BANDS){
83 av_log(avctx, AV_LOG_ERROR, "Too many bands: %i\n", c->maxbands);
84 return -1;
85 }
86 skip_bits_long(&gb, 88);
87 c->gapless = get_bits1(&gb);
88 c->lastframelen = get_bits(&gb, 11);
89 av_log(avctx, AV_LOG_DEBUG, "IS: %d, MSS: %d, TG: %d, LFL: %d, bands: %d\n",
90 c->IS, c->MSS, c->gapless, c->lastframelen, c->maxbands);
91 c->frames_to_skip = 0;
92
93 avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
94 avctx->channel_layout = AV_CH_LAYOUT_STEREO;
95
96 if(vlc_initialized) return 0;
97 av_log(avctx, AV_LOG_DEBUG, "Initing VLC\n");
98 scfi_vlc.table = scfi_table;
99 scfi_vlc.table_allocated = 1 << MPC7_SCFI_BITS;
100 if(init_vlc(&scfi_vlc, MPC7_SCFI_BITS, MPC7_SCFI_SIZE,
101 &mpc7_scfi[1], 2, 1,
102 &mpc7_scfi[0], 2, 1, INIT_VLC_USE_NEW_STATIC)){
103 av_log(avctx, AV_LOG_ERROR, "Cannot init SCFI VLC\n");
104 return -1;
105 }
106 dscf_vlc.table = dscf_table;
107 dscf_vlc.table_allocated = 1 << MPC7_DSCF_BITS;
108 if(init_vlc(&dscf_vlc, MPC7_DSCF_BITS, MPC7_DSCF_SIZE,
109 &mpc7_dscf[1], 2, 1,
110 &mpc7_dscf[0], 2, 1, INIT_VLC_USE_NEW_STATIC)){
111 av_log(avctx, AV_LOG_ERROR, "Cannot init DSCF VLC\n");
112 return -1;
113 }
114 hdr_vlc.table = hdr_table;
115 hdr_vlc.table_allocated = 1 << MPC7_HDR_BITS;
116 if(init_vlc(&hdr_vlc, MPC7_HDR_BITS, MPC7_HDR_SIZE,
117 &mpc7_hdr[1], 2, 1,
118 &mpc7_hdr[0], 2, 1, INIT_VLC_USE_NEW_STATIC)){
119 av_log(avctx, AV_LOG_ERROR, "Cannot init HDR VLC\n");
120 return -1;
121 }
122 for(i = 0; i < MPC7_QUANT_VLC_TABLES; i++){
123 for(j = 0; j < 2; j++){
124 quant_vlc[i][j].table = &quant_tables[quant_offsets[i*2 + j]];
125 quant_vlc[i][j].table_allocated = quant_offsets[i*2 + j + 1] - quant_offsets[i*2 + j];
126 if(init_vlc(&quant_vlc[i][j], 9, mpc7_quant_vlc_sizes[i],
127 &mpc7_quant_vlc[i][j][1], 4, 2,
128 &mpc7_quant_vlc[i][j][0], 4, 2, INIT_VLC_USE_NEW_STATIC)){
129 av_log(avctx, AV_LOG_ERROR, "Cannot init QUANT VLC %i,%i\n",i,j);
130 return -1;
131 }
132 }
133 }
134 vlc_initialized = 1;
135
136 return 0;
137 }
138
139 /**
140 * Fill samples for given subband
141 */
142 static inline void idx_to_quant(MPCContext *c, GetBitContext *gb, int idx, int *dst)
143 {
144 int i, i1, t;
145 switch(idx){
146 case -1:
147 for(i = 0; i < SAMPLES_PER_BAND; i++){
148 *dst++ = (av_lfg_get(&c->rnd) & 0x3FC) - 510;
149 }
150 break;
151 case 1:
152 i1 = get_bits1(gb);
153 for(i = 0; i < SAMPLES_PER_BAND/3; i++){
154 t = get_vlc2(gb, quant_vlc[0][i1].table, 9, 2);
155 *dst++ = mpc7_idx30[t];
156 *dst++ = mpc7_idx31[t];
157 *dst++ = mpc7_idx32[t];
158 }
159 break;
160 case 2:
161 i1 = get_bits1(gb);
162 for(i = 0; i < SAMPLES_PER_BAND/2; i++){
163 t = get_vlc2(gb, quant_vlc[1][i1].table, 9, 2);
164 *dst++ = mpc7_idx50[t];
165 *dst++ = mpc7_idx51[t];
166 }
167 break;
168 case 3: case 4: case 5: case 6: case 7:
169 i1 = get_bits1(gb);
170 for(i = 0; i < SAMPLES_PER_BAND; i++)
171 *dst++ = get_vlc2(gb, quant_vlc[idx-1][i1].table, 9, 2) - mpc7_quant_vlc_off[idx-1];
172 break;
173 case 8: case 9: case 10: case 11: case 12:
174 case 13: case 14: case 15: case 16: case 17:
175 t = (1 << (idx - 2)) - 1;
176 for(i = 0; i < SAMPLES_PER_BAND; i++)
177 *dst++ = get_bits(gb, idx - 1) - t;
178 break;
179 default: // case 0 and -2..-17
180 return;
181 }
182 }
183
184 static int get_scale_idx(GetBitContext *gb, int ref)
185 {
186 int t = get_vlc2(gb, dscf_vlc.table, MPC7_DSCF_BITS, 1) - 7;
187 if (t == 8)
188 return get_bits(gb, 6);
189 return ref + t;
190 }
191
192 static int mpc7_decode_frame(AVCodecContext * avctx, void *data,
193 int *got_frame_ptr, AVPacket *avpkt)
194 {
195 AVFrame *frame = data;
196 const uint8_t *buf = avpkt->data;
197 int buf_size;
198 MPCContext *c = avctx->priv_data;
199 GetBitContext gb;
200 int i, ch;
201 int mb = -1;
202 Band *bands = c->bands;
203 int off, ret, last_frame, skip;
204 int bits_used, bits_avail;
205
206 memset(bands, 0, sizeof(*bands) * (c->maxbands + 1));
207
208 buf_size = avpkt->size & ~3;
209 if (buf_size <= 0) {
210 av_log(avctx, AV_LOG_ERROR, "packet size is too small (%i bytes)\n",
211 avpkt->size);
212 return AVERROR_INVALIDDATA;
213 }
214 if (buf_size != avpkt->size) {
215 av_log(avctx, AV_LOG_WARNING, "packet size is not a multiple of 4. "
216 "extra bytes at the end will be skipped.\n");
217 }
218
219 skip = buf[0];
220 last_frame = buf[1];
221 buf += 4;
222 buf_size -= 4;
223
224 /* get output buffer */
225 frame->nb_samples = MPC_FRAME_SIZE;
226 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
227 return ret;
228
229 av_fast_padded_malloc(&c->bits, &c->buf_size, buf_size);
230 if (!c->bits)
231 return AVERROR(ENOMEM);
232 c->bdsp.bswap_buf((uint32_t *) c->bits, (const uint32_t *) buf,
233 buf_size >> 2);
234 init_get_bits(&gb, c->bits, buf_size * 8);
235 skip_bits_long(&gb, skip);
236
237 /* read subband indexes */
238 for(i = 0; i <= c->maxbands; i++){
239 for(ch = 0; ch < 2; ch++){
240 int t = 4;
241 if(i) t = get_vlc2(&gb, hdr_vlc.table, MPC7_HDR_BITS, 1) - 5;
242 if(t == 4) bands[i].res[ch] = get_bits(&gb, 4);
243 else bands[i].res[ch] = bands[i-1].res[ch] + t;
244 if (bands[i].res[ch] < -1 || bands[i].res[ch] > 17) {
245 av_log(avctx, AV_LOG_ERROR, "subband index invalid\n");
246 return AVERROR_INVALIDDATA;
247 }
248 }
249
250 if(bands[i].res[0] || bands[i].res[1]){
251 mb = i;
252 if(c->MSS) bands[i].msf = get_bits1(&gb);
253 }
254 }
255 /* get scale indexes coding method */
256 for(i = 0; i <= mb; i++)
257 for(ch = 0; ch < 2; ch++)
258 if(bands[i].res[ch]) bands[i].scfi[ch] = get_vlc2(&gb, scfi_vlc.table, MPC7_SCFI_BITS, 1);
259 /* get scale indexes */
260 for(i = 0; i <= mb; i++){
261 for(ch = 0; ch < 2; ch++){
262 if(bands[i].res[ch]){
263 bands[i].scf_idx[ch][2] = c->oldDSCF[ch][i];
264 bands[i].scf_idx[ch][0] = get_scale_idx(&gb, bands[i].scf_idx[ch][2]);
265 switch(bands[i].scfi[ch]){
266 case 0:
267 bands[i].scf_idx[ch][1] = get_scale_idx(&gb, bands[i].scf_idx[ch][0]);
268 bands[i].scf_idx[ch][2] = get_scale_idx(&gb, bands[i].scf_idx[ch][1]);
269 break;
270 case 1:
271 bands[i].scf_idx[ch][1] = get_scale_idx(&gb, bands[i].scf_idx[ch][0]);
272 bands[i].scf_idx[ch][2] = bands[i].scf_idx[ch][1];
273 break;
274 case 2:
275 bands[i].scf_idx[ch][1] = bands[i].scf_idx[ch][0];
276 bands[i].scf_idx[ch][2] = get_scale_idx(&gb, bands[i].scf_idx[ch][1]);
277 break;
278 case 3:
279 bands[i].scf_idx[ch][2] = bands[i].scf_idx[ch][1] = bands[i].scf_idx[ch][0];
280 break;
281 }
282 c->oldDSCF[ch][i] = bands[i].scf_idx[ch][2];
283 }
284 }
285 }
286 /* get quantizers */
287 memset(c->Q, 0, sizeof(c->Q));
288 off = 0;
289 for(i = 0; i < BANDS; i++, off += SAMPLES_PER_BAND)
290 for(ch = 0; ch < 2; ch++)
291 idx_to_quant(c, &gb, bands[i].res[ch], c->Q[ch] + off);
292
293 ff_mpc_dequantize_and_synth(c, mb, (int16_t **)frame->extended_data, 2);
294 if(last_frame)
295 frame->nb_samples = c->lastframelen;
296
297 bits_used = get_bits_count(&gb);
298 bits_avail = buf_size * 8;
299 if (!last_frame && ((bits_avail < bits_used) || (bits_used + 32 <= bits_avail))) {
300 av_log(avctx, AV_LOG_ERROR, "Error decoding frame: used %i of %i bits\n", bits_used, bits_avail);
301 return -1;
302 }
303 if(c->frames_to_skip){
304 c->frames_to_skip--;
305 *got_frame_ptr = 0;
306 return avpkt->size;
307 }
308
309 *got_frame_ptr = 1;
310
311 return avpkt->size;
312 }
313
314 static void mpc7_decode_flush(AVCodecContext *avctx)
315 {
316 MPCContext *c = avctx->priv_data;
317
318 memset(c->oldDSCF, 0, sizeof(c->oldDSCF));
319 c->frames_to_skip = 32;
320 }
321
322 static av_cold int mpc7_decode_close(AVCodecContext *avctx)
323 {
324 MPCContext *c = avctx->priv_data;
325 av_freep(&c->bits);
326 c->buf_size = 0;
327 return 0;
328 }
329
330 AVCodec ff_mpc7_decoder = {
331 .name = "mpc7",
332 .long_name = NULL_IF_CONFIG_SMALL("Musepack SV7"),
333 .type = AVMEDIA_TYPE_AUDIO,
334 .id = AV_CODEC_ID_MUSEPACK7,
335 .priv_data_size = sizeof(MPCContext),
336 .init = mpc7_decode_init,
337 .close = mpc7_decode_close,
338 .decode = mpc7_decode_frame,
339 .flush = mpc7_decode_flush,
340 .capabilities = CODEC_CAP_DR1,
341 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
342 AV_SAMPLE_FMT_NONE },
343 };