mpc7: use av_fast_padded_malloc()
[libav.git] / libavcodec / mpc7.c
CommitLineData
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1/*
2 * Musepack SV7 decoder
3 * Copyright (c) 2006 Konstantin Shishkov
4 *
2912e87a 5 * This file is part of Libav.
24e649af 6 *
2912e87a 7 * Libav is free software; you can redistribute it and/or
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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 *
2912e87a 12 * Libav is distributed in the hope that it will be useful,
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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
2912e87a 18 * License along with Libav; if not, write to the Free Software
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19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22/**
ba87f080 23 * @file
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24 * MPEG Audio Layer 1/2 -like codec with frames of 1152 samples
25 * divided into 32 subbands.
26 */
27
74e2a078 28#include "libavutil/lfg.h"
24e649af 29#include "avcodec.h"
9106a698 30#include "get_bits.h"
24e649af 31#include "dsputil.h"
c4f5c2d6 32#include "mpegaudiodsp.h"
737eb597 33#include "libavutil/audioconvert.h"
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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
42static VLC scfi_vlc, dscf_vlc, hdr_vlc, quant_vlc[MPC7_QUANT_VLC_TABLES][2];
43
40039717 44static const uint16_t quant_offsets[MPC7_QUANT_VLC_TABLES*2 + 1] =
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45{
46 0, 512, 1024, 1536, 2052, 2564, 3076, 3588, 4100, 4612, 5124,
47 5636, 6164, 6676, 7224
48};
49
50
98a6fff9 51static av_cold int mpc7_decode_init(AVCodecContext * avctx)
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52{
53 int i, j;
54 MPCContext *c = avctx->priv_data;
55 GetBitContext gb;
eac31dd1 56 LOCAL_ALIGNED_16(uint8_t, buf, [16]);
5e534865 57 static int vlc_initialized = 0;
24e649af 58
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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
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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
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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));
74e2a078 76 av_lfg_init(&c->rnd, 0xDEADBEEF);
24e649af 77 dsputil_init(&c->dsp, avctx);
c4f5c2d6 78 ff_mpadsp_init(&c->mpadsp);
0ff4670a 79 c->dsp.bswap_buf((uint32_t*)buf, (const uint32_t*)avctx->extradata, 4);
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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 }
0a8dedc9 90 skip_bits_long(&gb, 88);
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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
5d6e4c16 97 avctx->sample_fmt = AV_SAMPLE_FMT_S16;
befc473c 98 avctx->channel_layout = AV_CH_LAYOUT_STEREO;
76c4a644 99
5e534865 100 if(vlc_initialized) return 0;
24e649af 101 av_log(avctx, AV_LOG_DEBUG, "Initing VLC\n");
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102 scfi_vlc.table = scfi_table;
103 scfi_vlc.table_allocated = 1 << MPC7_SCFI_BITS;
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104 if(init_vlc(&scfi_vlc, MPC7_SCFI_BITS, MPC7_SCFI_SIZE,
105 &mpc7_scfi[1], 2, 1,
bd4110f9 106 &mpc7_scfi[0], 2, 1, INIT_VLC_USE_NEW_STATIC)){
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107 av_log(avctx, AV_LOG_ERROR, "Cannot init SCFI VLC\n");
108 return -1;
109 }
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110 dscf_vlc.table = dscf_table;
111 dscf_vlc.table_allocated = 1 << MPC7_DSCF_BITS;
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112 if(init_vlc(&dscf_vlc, MPC7_DSCF_BITS, MPC7_DSCF_SIZE,
113 &mpc7_dscf[1], 2, 1,
bd4110f9 114 &mpc7_dscf[0], 2, 1, INIT_VLC_USE_NEW_STATIC)){
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115 av_log(avctx, AV_LOG_ERROR, "Cannot init DSCF VLC\n");
116 return -1;
117 }
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118 hdr_vlc.table = hdr_table;
119 hdr_vlc.table_allocated = 1 << MPC7_HDR_BITS;
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120 if(init_vlc(&hdr_vlc, MPC7_HDR_BITS, MPC7_HDR_SIZE,
121 &mpc7_hdr[1], 2, 1,
bd4110f9 122 &mpc7_hdr[0], 2, 1, INIT_VLC_USE_NEW_STATIC)){
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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++){
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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];
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130 if(init_vlc(&quant_vlc[i][j], 9, mpc7_quant_vlc_sizes[i],
131 &mpc7_quant_vlc[i][j][1], 4, 2,
bd4110f9 132 &mpc7_quant_vlc[i][j][0], 4, 2, INIT_VLC_USE_NEW_STATIC)){
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133 av_log(avctx, AV_LOG_ERROR, "Cannot init QUANT VLC %i,%i\n",i,j);
134 return -1;
135 }
136 }
137 }
5e534865 138 vlc_initialized = 1;
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139
140 avcodec_get_frame_defaults(&c->frame);
141 avctx->coded_frame = &c->frame;
142
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143 return 0;
144}
145
146/**
147 * Fill samples for given subband
148 */
149static 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++){
74e2a078 155 *dst++ = (av_lfg_get(&c->rnd) & 0x3FC) - 510;
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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
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191static 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 ref + t;
197}
198
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199static int mpc7_decode_frame(AVCodecContext * avctx, void *data,
200 int *got_frame_ptr, AVPacket *avpkt)
24e649af 201{
7a00bbad 202 const uint8_t *buf = avpkt->data;
b5b825c3 203 int buf_size;
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204 MPCContext *c = avctx->priv_data;
205 GetBitContext gb;
836fc777 206 int i, ch;
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207 int mb = -1;
208 Band *bands = c->bands;
b5b825c3 209 int off, ret, last_frame, skip;
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210 int bits_used, bits_avail;
211
88b24369 212 memset(bands, 0, sizeof(*bands) * (c->maxbands + 1));
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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");
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223 }
224
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225 skip = buf[0];
226 last_frame = buf[1];
227 buf += 4;
228 buf_size -= 4;
229
0eea2129 230 /* get output buffer */
b5b825c3 231 c->frame.nb_samples = last_frame ? c->lastframelen : MPC_FRAME_SIZE;
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232 if ((ret = avctx->get_buffer(avctx, &c->frame)) < 0) {
233 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
234 return ret;
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235 }
236
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237 av_fast_padded_malloc(&c->bits, &c->buf_size, buf_size);
238 if (!c->bits)
3c4add27 239 return AVERROR(ENOMEM);
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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);
b5b825c3 242 skip_bits_long(&gb, skip);
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243
244 /* read subband indexes */
245 for(i = 0; i <= c->maxbands; i++){
246 for(ch = 0; ch < 2; ch++){
836fc777 247 int t = 4;
24e649af 248 if(i) t = get_vlc2(&gb, hdr_vlc.table, MPC7_HDR_BITS, 1) - 5;
836fc777 249 if(t == 4) bands[i].res[ch] = get_bits(&gb, 4);
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250 else bands[i].res[ch] = bands[i-1].res[ch] + t;
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];
88517e9f 267 bands[i].scf_idx[ch][0] = get_scale_idx(&gb, bands[i].scf_idx[ch][2]);
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268 switch(bands[i].scfi[ch]){
269 case 0:
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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]);
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272 break;
273 case 1:
88517e9f 274 bands[i].scf_idx[ch][1] = get_scale_idx(&gb, bands[i].scf_idx[ch][0]);
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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];
88517e9f 279 bands[i].scf_idx[ch][2] = get_scale_idx(&gb, bands[i].scf_idx[ch][1]);
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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
0eea2129 296 ff_mpc_dequantize_and_synth(c, mb, c->frame.data[0], 2);
24e649af 297
24e649af 298 bits_used = get_bits_count(&gb);
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299 bits_avail = buf_size * 8;
300 if (!last_frame && ((bits_avail < bits_used) || (bits_used + 32 <= bits_avail))) {
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301 av_log(NULL,0, "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--;
0eea2129 306 *got_frame_ptr = 0;
b5b825c3 307 return avpkt->size;
24e649af 308 }
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309
310 *got_frame_ptr = 1;
311 *(AVFrame *)data = c->frame;
24e649af 312
b5b825c3 313 return avpkt->size;
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314}
315
316static 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
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324static 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
d36beb3f 332AVCodec ff_mpc7_decoder = {
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333 .name = "mpc7",
334 .type = AVMEDIA_TYPE_AUDIO,
335 .id = CODEC_ID_MUSEPACK7,
336 .priv_data_size = sizeof(MPCContext),
337 .init = mpc7_decode_init,
83ce51cc 338 .close = mpc7_decode_close,
ec6402b7 339 .decode = mpc7_decode_frame,
24e649af 340 .flush = mpc7_decode_flush,
0eea2129 341 .capabilities = CODEC_CAP_DR1,
fe4bf374 342 .long_name = NULL_IF_CONFIG_SMALL("Musepack SV7"),
24e649af 343};