vlc: Add header #include when the types are used
[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/internal.h"
30 #include "libavutil/lfg.h"
31
32 #include "avcodec.h"
33 #include "bitstream.h"
34 #include "internal.h"
35 #include "mpegaudiodsp.h"
36 #include "vlc.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 const uint16_t quant_offsets[MPC7_QUANT_VLC_TABLES*2 + 1] =
48 {
49 0, 512, 1024, 1536, 2052, 2564, 3076, 3588, 4100, 4612, 5124,
50 5636, 6164, 6676, 7224
51 };
52
53
54 static av_cold int mpc7_decode_init(AVCodecContext * avctx)
55 {
56 int i, j;
57 MPCContext *c = avctx->priv_data;
58 BitstreamContext bc;
59 LOCAL_ALIGNED_16(uint8_t, buf, [16]);
60 static int vlc_initialized = 0;
61
62 static VLC_TYPE scfi_table[1 << MPC7_SCFI_BITS][2];
63 static VLC_TYPE dscf_table[1 << MPC7_DSCF_BITS][2];
64 static VLC_TYPE hdr_table[1 << MPC7_HDR_BITS][2];
65 static VLC_TYPE quant_tables[7224][2];
66
67 /* Musepack SV7 is always stereo */
68 if (avctx->channels != 2) {
69 avpriv_request_sample(avctx, "%d channels", avctx->channels);
70 return AVERROR_PATCHWELCOME;
71 }
72
73 if(avctx->extradata_size < 16){
74 av_log(avctx, AV_LOG_ERROR, "Too small extradata size (%i)!\n", avctx->extradata_size);
75 return -1;
76 }
77 memset(c->oldDSCF, 0, sizeof(c->oldDSCF));
78 av_lfg_init(&c->rnd, 0xDEADBEEF);
79 ff_bswapdsp_init(&c->bdsp);
80 ff_mpadsp_init(&c->mpadsp);
81 c->bdsp.bswap_buf((uint32_t *) buf, (const uint32_t *) avctx->extradata, 4);
82 ff_mpc_init();
83 bitstream_init(&bc, buf, 128);
84
85 c->IS = bitstream_read_bit(&bc);
86 c->MSS = bitstream_read_bit(&bc);
87 c->maxbands = bitstream_read(&bc, 6);
88 if(c->maxbands >= BANDS){
89 av_log(avctx, AV_LOG_ERROR, "Too many bands: %i\n", c->maxbands);
90 return -1;
91 }
92 bitstream_skip(&bc, 88);
93 c->gapless = bitstream_read_bit(&bc);
94 c->lastframelen = bitstream_read(&bc, 11);
95 av_log(avctx, AV_LOG_DEBUG, "IS: %d, MSS: %d, TG: %d, LFL: %d, bands: %d\n",
96 c->IS, c->MSS, c->gapless, c->lastframelen, c->maxbands);
97 c->frames_to_skip = 0;
98
99 avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
100 avctx->channel_layout = AV_CH_LAYOUT_STEREO;
101
102 if(vlc_initialized) return 0;
103 av_log(avctx, AV_LOG_DEBUG, "Initing VLC\n");
104 scfi_vlc.table = scfi_table;
105 scfi_vlc.table_allocated = 1 << MPC7_SCFI_BITS;
106 if(init_vlc(&scfi_vlc, MPC7_SCFI_BITS, MPC7_SCFI_SIZE,
107 &mpc7_scfi[1], 2, 1,
108 &mpc7_scfi[0], 2, 1, INIT_VLC_USE_NEW_STATIC)){
109 av_log(avctx, AV_LOG_ERROR, "Cannot init SCFI VLC\n");
110 return -1;
111 }
112 dscf_vlc.table = dscf_table;
113 dscf_vlc.table_allocated = 1 << MPC7_DSCF_BITS;
114 if(init_vlc(&dscf_vlc, MPC7_DSCF_BITS, MPC7_DSCF_SIZE,
115 &mpc7_dscf[1], 2, 1,
116 &mpc7_dscf[0], 2, 1, INIT_VLC_USE_NEW_STATIC)){
117 av_log(avctx, AV_LOG_ERROR, "Cannot init DSCF VLC\n");
118 return -1;
119 }
120 hdr_vlc.table = hdr_table;
121 hdr_vlc.table_allocated = 1 << MPC7_HDR_BITS;
122 if(init_vlc(&hdr_vlc, MPC7_HDR_BITS, MPC7_HDR_SIZE,
123 &mpc7_hdr[1], 2, 1,
124 &mpc7_hdr[0], 2, 1, INIT_VLC_USE_NEW_STATIC)){
125 av_log(avctx, AV_LOG_ERROR, "Cannot init HDR VLC\n");
126 return -1;
127 }
128 for(i = 0; i < MPC7_QUANT_VLC_TABLES; i++){
129 for(j = 0; j < 2; j++){
130 quant_vlc[i][j].table = &quant_tables[quant_offsets[i*2 + j]];
131 quant_vlc[i][j].table_allocated = quant_offsets[i*2 + j + 1] - quant_offsets[i*2 + j];
132 if(init_vlc(&quant_vlc[i][j], 9, mpc7_quant_vlc_sizes[i],
133 &mpc7_quant_vlc[i][j][1], 4, 2,
134 &mpc7_quant_vlc[i][j][0], 4, 2, INIT_VLC_USE_NEW_STATIC)){
135 av_log(avctx, AV_LOG_ERROR, "Cannot init QUANT VLC %i,%i\n",i,j);
136 return -1;
137 }
138 }
139 }
140 vlc_initialized = 1;
141
142 return 0;
143 }
144
145 /**
146 * Fill samples for given subband
147 */
148 static inline void idx_to_quant(MPCContext *c, BitstreamContext *bc, int idx, int *dst)
149 {
150 int i, i1, t;
151 switch(idx){
152 case -1:
153 for(i = 0; i < SAMPLES_PER_BAND; i++){
154 *dst++ = (av_lfg_get(&c->rnd) & 0x3FC) - 510;
155 }
156 break;
157 case 1:
158 i1 = bitstream_read_bit(bc);
159 for(i = 0; i < SAMPLES_PER_BAND/3; i++){
160 t = bitstream_read_vlc(bc, quant_vlc[0][i1].table, 9, 2);
161 *dst++ = mpc7_idx30[t];
162 *dst++ = mpc7_idx31[t];
163 *dst++ = mpc7_idx32[t];
164 }
165 break;
166 case 2:
167 i1 = bitstream_read_bit(bc);
168 for(i = 0; i < SAMPLES_PER_BAND/2; i++){
169 t = bitstream_read_vlc(bc, quant_vlc[1][i1].table, 9, 2);
170 *dst++ = mpc7_idx50[t];
171 *dst++ = mpc7_idx51[t];
172 }
173 break;
174 case 3: case 4: case 5: case 6: case 7:
175 i1 = bitstream_read_bit(bc);
176 for(i = 0; i < SAMPLES_PER_BAND; i++)
177 *dst++ = bitstream_read_vlc(bc, quant_vlc[idx - 1][i1].table, 9, 2) - mpc7_quant_vlc_off[idx - 1];
178 break;
179 case 8: case 9: case 10: case 11: case 12:
180 case 13: case 14: case 15: case 16: case 17:
181 t = (1 << (idx - 2)) - 1;
182 for(i = 0; i < SAMPLES_PER_BAND; i++)
183 *dst++ = bitstream_read(bc, idx - 1) - t;
184 break;
185 default: // case 0 and -2..-17
186 return;
187 }
188 }
189
190 static int get_scale_idx(BitstreamContext *bc, int ref)
191 {
192 int t = bitstream_read_vlc(bc, dscf_vlc.table, MPC7_DSCF_BITS, 1) - 7;
193 if (t == 8)
194 return bitstream_read(bc, 6);
195 return av_clip_uintp2(ref + t, 7);
196 }
197
198 static int mpc7_decode_frame(AVCodecContext * avctx, void *data,
199 int *got_frame_ptr, AVPacket *avpkt)
200 {
201 AVFrame *frame = data;
202 const uint8_t *buf = avpkt->data;
203 int buf_size;
204 MPCContext *c = avctx->priv_data;
205 BitstreamContext bc;
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 frame->nb_samples = last_frame ? c->lastframelen : MPC_FRAME_SIZE;
232 if ((ret = ff_get_buffer(avctx, frame, 0)) < 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->bdsp.bswap_buf((uint32_t *) c->bits, (const uint32_t *) buf,
241 buf_size >> 2);
242 bitstream_init8(&bc, c->bits, buf_size);
243 bitstream_skip(&bc, skip);
244
245 /* read subband indexes */
246 for(i = 0; i <= c->maxbands; i++){
247 for(ch = 0; ch < 2; ch++){
248 int t = 4;
249 if (i)
250 t = bitstream_read_vlc(&bc, hdr_vlc.table, MPC7_HDR_BITS, 1) - 5;
251 if (t == 4)
252 bands[i].res[ch] = bitstream_read(&bc, 4);
253 else bands[i].res[ch] = av_clip(bands[i-1].res[ch] + t, 0, 17);
254 }
255
256 if(bands[i].res[0] || bands[i].res[1]){
257 mb = i;
258 if (c->MSS)
259 bands[i].msf = bitstream_read_bit(&bc);
260 }
261 }
262 /* get scale indexes coding method */
263 for(i = 0; i <= mb; i++)
264 for(ch = 0; ch < 2; ch++)
265 if (bands[i].res[ch])
266 bands[i].scfi[ch] = bitstream_read_vlc(&bc, scfi_vlc.table, MPC7_SCFI_BITS, 1);
267 /* get scale indexes */
268 for(i = 0; i <= mb; i++){
269 for(ch = 0; ch < 2; ch++){
270 if(bands[i].res[ch]){
271 bands[i].scf_idx[ch][2] = c->oldDSCF[ch][i];
272 bands[i].scf_idx[ch][0] = get_scale_idx(&bc, bands[i].scf_idx[ch][2]);
273 switch(bands[i].scfi[ch]){
274 case 0:
275 bands[i].scf_idx[ch][1] = get_scale_idx(&bc, bands[i].scf_idx[ch][0]);
276 bands[i].scf_idx[ch][2] = get_scale_idx(&bc, bands[i].scf_idx[ch][1]);
277 break;
278 case 1:
279 bands[i].scf_idx[ch][1] = get_scale_idx(&bc, bands[i].scf_idx[ch][0]);
280 bands[i].scf_idx[ch][2] = bands[i].scf_idx[ch][1];
281 break;
282 case 2:
283 bands[i].scf_idx[ch][1] = bands[i].scf_idx[ch][0];
284 bands[i].scf_idx[ch][2] = get_scale_idx(&bc, bands[i].scf_idx[ch][1]);
285 break;
286 case 3:
287 bands[i].scf_idx[ch][2] = bands[i].scf_idx[ch][1] = bands[i].scf_idx[ch][0];
288 break;
289 }
290 c->oldDSCF[ch][i] = bands[i].scf_idx[ch][2];
291 }
292 }
293 }
294 /* get quantizers */
295 memset(c->Q, 0, sizeof(c->Q));
296 off = 0;
297 for(i = 0; i < BANDS; i++, off += SAMPLES_PER_BAND)
298 for(ch = 0; ch < 2; ch++)
299 idx_to_quant(c, &bc, bands[i].res[ch], c->Q[ch] + off);
300
301 ff_mpc_dequantize_and_synth(c, mb, (int16_t **)frame->extended_data, 2);
302
303 bits_used = bitstream_tell(&bc);
304 bits_avail = buf_size * 8;
305 if (!last_frame && ((bits_avail < bits_used) || (bits_used + 32 <= bits_avail))) {
306 av_log(avctx, AV_LOG_ERROR, "Error decoding frame: used %i of %i bits\n", bits_used, bits_avail);
307 return -1;
308 }
309 if(c->frames_to_skip){
310 c->frames_to_skip--;
311 *got_frame_ptr = 0;
312 return avpkt->size;
313 }
314
315 *got_frame_ptr = 1;
316
317 return avpkt->size;
318 }
319
320 static void mpc7_decode_flush(AVCodecContext *avctx)
321 {
322 MPCContext *c = avctx->priv_data;
323
324 memset(c->oldDSCF, 0, sizeof(c->oldDSCF));
325 c->frames_to_skip = 32;
326 }
327
328 static av_cold int mpc7_decode_close(AVCodecContext *avctx)
329 {
330 MPCContext *c = avctx->priv_data;
331 av_freep(&c->bits);
332 c->buf_size = 0;
333 return 0;
334 }
335
336 AVCodec ff_mpc7_decoder = {
337 .name = "mpc7",
338 .long_name = NULL_IF_CONFIG_SMALL("Musepack SV7"),
339 .type = AVMEDIA_TYPE_AUDIO,
340 .id = AV_CODEC_ID_MUSEPACK7,
341 .priv_data_size = sizeof(MPCContext),
342 .init = mpc7_decode_init,
343 .close = mpc7_decode_close,
344 .decode = mpc7_decode_frame,
345 .flush = mpc7_decode_flush,
346 .capabilities = AV_CODEC_CAP_DR1,
347 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
348 AV_SAMPLE_FMT_NONE },
349 };