3 * Copyright (c) 2007 Konstantin Shishkov
5 * This file is part of FFmpeg.
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.
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.
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
24 * MPEG Audio Layer 1/2 -like codec with frames of 1152 samples
25 * divided into 32 subbands.
28 #include "libavutil/channel_layout.h"
29 #include "libavutil/lfg.h"
34 #include "mpegaudiodsp.h"
40 static VLC band_vlc, scfi_vlc[2], dscf_vlc[2], res_vlc[2];
41 static VLC q1_vlc, q2_vlc[2], q3_vlc[2], quant_vlc[4][2], q9up_vlc;
43 static const int q3_offsets[2] = { MPC8_Q3_OFFSET, MPC8_Q4_OFFSET };
44 static const int quant_offsets[6] = { MPC8_Q5_OFFSET, MPC8_Q6_OFFSET, MPC8_Q7_OFFSET, MPC8_Q8_OFFSET };
46 static inline int mpc8_dec_base(GetBitContext *gb, int k, int n)
48 int len = mpc8_cnk_len[k-1][n-1] - 1;
49 int code = len ? get_bits_long(gb, len) : 0;
51 if (code >= mpc8_cnk_lost[k-1][n-1])
52 code = ((code << 1) | get_bits1(gb)) - mpc8_cnk_lost[k-1][n-1];
57 static inline int mpc8_dec_enum(GetBitContext *gb, int k, int n)
60 const uint32_t * C = mpc8_cnk[k-1];
61 int code = mpc8_dec_base(gb, k, n);
76 static inline int mpc8_get_mod_golomb(GetBitContext *gb, int m)
78 if(mpc8_cnk_len[0][m] < 1) return 0;
79 return mpc8_dec_base(gb, 1, m+1);
82 static int mpc8_get_mask(GetBitContext *gb, int size, int t)
87 mask = mpc8_dec_enum(gb, FFMIN(t, size - t), size);
88 if((t << 1) > size) mask = ~mask;
93 static const uint16_t vlc_offsets[13] = {
94 0, 640, 1184, 1748, 2298, 2426, 2554, 3066, 3578, 4106, 4618, 5196, 5708
97 static av_cold int mpc8_decode_init(AVCodecContext * avctx)
100 MPCContext *c = avctx->priv_data;
102 static int vlc_initialized = 0;
105 static VLC_TYPE band_table[542][2];
106 static VLC_TYPE q1_table[520][2];
107 static VLC_TYPE q9up_table[524][2];
108 static VLC_TYPE scfi0_table[1 << MPC8_SCFI0_BITS][2];
109 static VLC_TYPE scfi1_table[1 << MPC8_SCFI1_BITS][2];
110 static VLC_TYPE dscf0_table[560][2];
111 static VLC_TYPE dscf1_table[598][2];
112 static VLC_TYPE q3_0_table[512][2];
113 static VLC_TYPE q3_1_table[516][2];
114 static VLC_TYPE codes_table[5708][2];
116 if(avctx->extradata_size < 2){
117 av_log(avctx, AV_LOG_ERROR, "Too small extradata size (%i)!\n", avctx->extradata_size);
120 memset(c->oldDSCF, 0, sizeof(c->oldDSCF));
121 av_lfg_init(&c->rnd, 0xDEADBEEF);
122 ff_dsputil_init(&c->dsp, avctx);
123 ff_mpadsp_init(&c->mpadsp);
127 init_get_bits(&gb, avctx->extradata, 16);
129 skip_bits(&gb, 3);//sample rate
130 c->maxbands = get_bits(&gb, 5) + 1;
131 if (c->maxbands >= BANDS) {
132 av_log(avctx,AV_LOG_ERROR, "maxbands %d too high\n", c->maxbands);
133 return AVERROR_INVALIDDATA;
135 channels = get_bits(&gb, 4) + 1;
137 avpriv_request_sample(avctx, "Multichannel MPC SV8");
138 return AVERROR_PATCHWELCOME;
140 c->MSS = get_bits1(&gb);
141 c->frames = 1 << (get_bits(&gb, 3) * 2);
143 avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
144 avctx->channel_layout = (channels==2) ? AV_CH_LAYOUT_STEREO : AV_CH_LAYOUT_MONO;
145 avctx->channels = channels;
147 if(vlc_initialized) return 0;
148 av_log(avctx, AV_LOG_DEBUG, "Initing VLC\n");
150 band_vlc.table = band_table;
151 band_vlc.table_allocated = 542;
152 init_vlc(&band_vlc, MPC8_BANDS_BITS, MPC8_BANDS_SIZE,
153 mpc8_bands_bits, 1, 1,
154 mpc8_bands_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
156 q1_vlc.table = q1_table;
157 q1_vlc.table_allocated = 520;
158 init_vlc(&q1_vlc, MPC8_Q1_BITS, MPC8_Q1_SIZE,
160 mpc8_q1_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
161 q9up_vlc.table = q9up_table;
162 q9up_vlc.table_allocated = 524;
163 init_vlc(&q9up_vlc, MPC8_Q9UP_BITS, MPC8_Q9UP_SIZE,
164 mpc8_q9up_bits, 1, 1,
165 mpc8_q9up_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
167 scfi_vlc[0].table = scfi0_table;
168 scfi_vlc[0].table_allocated = 1 << MPC8_SCFI0_BITS;
169 init_vlc(&scfi_vlc[0], MPC8_SCFI0_BITS, MPC8_SCFI0_SIZE,
170 mpc8_scfi0_bits, 1, 1,
171 mpc8_scfi0_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
172 scfi_vlc[1].table = scfi1_table;
173 scfi_vlc[1].table_allocated = 1 << MPC8_SCFI1_BITS;
174 init_vlc(&scfi_vlc[1], MPC8_SCFI1_BITS, MPC8_SCFI1_SIZE,
175 mpc8_scfi1_bits, 1, 1,
176 mpc8_scfi1_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
178 dscf_vlc[0].table = dscf0_table;
179 dscf_vlc[0].table_allocated = 560;
180 init_vlc(&dscf_vlc[0], MPC8_DSCF0_BITS, MPC8_DSCF0_SIZE,
181 mpc8_dscf0_bits, 1, 1,
182 mpc8_dscf0_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
183 dscf_vlc[1].table = dscf1_table;
184 dscf_vlc[1].table_allocated = 598;
185 init_vlc(&dscf_vlc[1], MPC8_DSCF1_BITS, MPC8_DSCF1_SIZE,
186 mpc8_dscf1_bits, 1, 1,
187 mpc8_dscf1_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
189 q3_vlc[0].table = q3_0_table;
190 q3_vlc[0].table_allocated = 512;
191 ff_init_vlc_sparse(&q3_vlc[0], MPC8_Q3_BITS, MPC8_Q3_SIZE,
194 mpc8_q3_syms, 1, 1, INIT_VLC_USE_NEW_STATIC);
195 q3_vlc[1].table = q3_1_table;
196 q3_vlc[1].table_allocated = 516;
197 ff_init_vlc_sparse(&q3_vlc[1], MPC8_Q4_BITS, MPC8_Q4_SIZE,
200 mpc8_q4_syms, 1, 1, INIT_VLC_USE_NEW_STATIC);
202 for(i = 0; i < 2; i++){
203 res_vlc[i].table = &codes_table[vlc_offsets[0+i]];
204 res_vlc[i].table_allocated = vlc_offsets[1+i] - vlc_offsets[0+i];
205 init_vlc(&res_vlc[i], MPC8_RES_BITS, MPC8_RES_SIZE,
206 &mpc8_res_bits[i], 1, 1,
207 &mpc8_res_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
209 q2_vlc[i].table = &codes_table[vlc_offsets[2+i]];
210 q2_vlc[i].table_allocated = vlc_offsets[3+i] - vlc_offsets[2+i];
211 init_vlc(&q2_vlc[i], MPC8_Q2_BITS, MPC8_Q2_SIZE,
212 &mpc8_q2_bits[i], 1, 1,
213 &mpc8_q2_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
215 quant_vlc[0][i].table = &codes_table[vlc_offsets[4+i]];
216 quant_vlc[0][i].table_allocated = vlc_offsets[5+i] - vlc_offsets[4+i];
217 init_vlc(&quant_vlc[0][i], MPC8_Q5_BITS, MPC8_Q5_SIZE,
218 &mpc8_q5_bits[i], 1, 1,
219 &mpc8_q5_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
220 quant_vlc[1][i].table = &codes_table[vlc_offsets[6+i]];
221 quant_vlc[1][i].table_allocated = vlc_offsets[7+i] - vlc_offsets[6+i];
222 init_vlc(&quant_vlc[1][i], MPC8_Q6_BITS, MPC8_Q6_SIZE,
223 &mpc8_q6_bits[i], 1, 1,
224 &mpc8_q6_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
225 quant_vlc[2][i].table = &codes_table[vlc_offsets[8+i]];
226 quant_vlc[2][i].table_allocated = vlc_offsets[9+i] - vlc_offsets[8+i];
227 init_vlc(&quant_vlc[2][i], MPC8_Q7_BITS, MPC8_Q7_SIZE,
228 &mpc8_q7_bits[i], 1, 1,
229 &mpc8_q7_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
230 quant_vlc[3][i].table = &codes_table[vlc_offsets[10+i]];
231 quant_vlc[3][i].table_allocated = vlc_offsets[11+i] - vlc_offsets[10+i];
232 init_vlc(&quant_vlc[3][i], MPC8_Q8_BITS, MPC8_Q8_SIZE,
233 &mpc8_q8_bits[i], 1, 1,
234 &mpc8_q8_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
241 static int mpc8_decode_frame(AVCodecContext * avctx, void *data,
242 int *got_frame_ptr, AVPacket *avpkt)
244 AVFrame *frame = data;
245 const uint8_t *buf = avpkt->data;
246 int buf_size = avpkt->size;
247 MPCContext *c = avctx->priv_data;
248 GetBitContext gb2, *gb = &gb2;
249 int i, j, k, ch, cnt, res, t;
250 Band *bands = c->bands;
252 int maxband, keyframe;
255 /* get output buffer */
256 frame->nb_samples = MPC_FRAME_SIZE;
257 if ((res = ff_get_buffer(avctx, frame, 0)) < 0)
260 keyframe = c->cur_frame == 0;
263 memset(c->Q, 0, sizeof(c->Q));
264 c->last_bits_used = 0;
266 init_get_bits(gb, buf, buf_size * 8);
267 skip_bits(gb, c->last_bits_used & 7);
270 maxband = mpc8_get_mod_golomb(gb, c->maxbands + 1);
272 maxband = c->last_max_band + get_vlc2(gb, band_vlc.table, MPC8_BANDS_BITS, 2);
273 if(maxband > 32) maxband -= 33;
276 if(maxband > c->maxbands + 1) {
277 av_log(avctx, AV_LOG_ERROR, "maxband %d too large\n",maxband);
278 return AVERROR_INVALIDDATA;
280 c->last_max_band = maxband;
282 /* read subband indexes */
284 last[0] = last[1] = 0;
285 for(i = maxband - 1; i >= 0; i--){
286 for(ch = 0; ch < 2; ch++){
287 last[ch] = get_vlc2(gb, res_vlc[last[ch] > 2].table, MPC8_RES_BITS, 2) + last[ch];
288 if(last[ch] > 15) last[ch] -= 17;
289 bands[i].res[ch] = last[ch];
296 for(i = 0; i < maxband; i++)
297 if(bands[i].res[0] || bands[i].res[1])
299 t = mpc8_get_mod_golomb(gb, cnt);
300 mask = mpc8_get_mask(gb, cnt, t);
301 for(i = maxband - 1; i >= 0; i--)
302 if(bands[i].res[0] || bands[i].res[1]){
303 bands[i].msf = mask & 1;
308 for(i = maxband; i < c->maxbands; i++)
309 bands[i].res[0] = bands[i].res[1] = 0;
312 for(i = 0; i < 32; i++)
313 c->oldDSCF[0][i] = c->oldDSCF[1][i] = 1;
316 for(i = 0; i < maxband; i++){
317 if(bands[i].res[0] || bands[i].res[1]){
318 cnt = !!bands[i].res[0] + !!bands[i].res[1] - 1;
320 t = get_vlc2(gb, scfi_vlc[cnt].table, scfi_vlc[cnt].bits, 1);
321 if(bands[i].res[0]) bands[i].scfi[0] = t >> (2 * cnt);
322 if(bands[i].res[1]) bands[i].scfi[1] = t & 3;
327 for(i = 0; i < maxband; i++){
328 for(ch = 0; ch < 2; ch++){
329 if(!bands[i].res[ch]) continue;
331 if(c->oldDSCF[ch][i]){
332 bands[i].scf_idx[ch][0] = get_bits(gb, 7) - 6;
333 c->oldDSCF[ch][i] = 0;
335 t = get_vlc2(gb, dscf_vlc[1].table, MPC8_DSCF1_BITS, 2);
337 t += get_bits(gb, 6);
338 bands[i].scf_idx[ch][0] = ((bands[i].scf_idx[ch][2] + t - 25) & 0x7F) - 6;
340 for(j = 0; j < 2; j++){
341 if((bands[i].scfi[ch] << j) & 2)
342 bands[i].scf_idx[ch][j + 1] = bands[i].scf_idx[ch][j];
344 t = get_vlc2(gb, dscf_vlc[0].table, MPC8_DSCF0_BITS, 2);
346 t = 64 + get_bits(gb, 6);
347 bands[i].scf_idx[ch][j + 1] = ((bands[i].scf_idx[ch][j] + t - 25) & 0x7F) - 6;
353 for(i = 0, off = 0; i < maxband; i++, off += SAMPLES_PER_BAND){
354 for(ch = 0; ch < 2; ch++){
355 res = bands[i].res[ch];
358 for(j = 0; j < SAMPLES_PER_BAND; j++)
359 c->Q[ch][off + j] = (av_lfg_get(&c->rnd) & 0x3FC) - 510;
364 for(j = 0; j < SAMPLES_PER_BAND; j += SAMPLES_PER_BAND / 2){
365 cnt = get_vlc2(gb, q1_vlc.table, MPC8_Q1_BITS, 2);
366 t = mpc8_get_mask(gb, 18, cnt);
367 for(k = 0; k < SAMPLES_PER_BAND / 2; k++, t <<= 1)
368 c->Q[ch][off + j + k] = (t & 0x20000) ? (get_bits1(gb) << 1) - 1 : 0;
372 cnt = 6;//2*mpc8_thres[res]
373 for(j = 0; j < SAMPLES_PER_BAND; j += 3){
374 t = get_vlc2(gb, q2_vlc[cnt > 3].table, MPC8_Q2_BITS, 2);
375 c->Q[ch][off + j + 0] = mpc8_idx50[t];
376 c->Q[ch][off + j + 1] = mpc8_idx51[t];
377 c->Q[ch][off + j + 2] = mpc8_idx52[t];
378 cnt = (cnt >> 1) + mpc8_huffq2[t];
383 for(j = 0; j < SAMPLES_PER_BAND; j += 2){
384 t = get_vlc2(gb, q3_vlc[res - 3].table, MPC8_Q3_BITS, 2) + q3_offsets[res - 3];
385 c->Q[ch][off + j + 1] = t >> 4;
386 c->Q[ch][off + j + 0] = (t & 8) ? (t & 0xF) - 16 : (t & 0xF);
393 cnt = 2 * mpc8_thres[res];
394 for(j = 0; j < SAMPLES_PER_BAND; j++){
395 t = get_vlc2(gb, quant_vlc[res - 5][cnt > mpc8_thres[res]].table, quant_vlc[res - 5][cnt > mpc8_thres[res]].bits, 2) + quant_offsets[res - 5];
396 c->Q[ch][off + j] = t;
397 cnt = (cnt >> 1) + FFABS(c->Q[ch][off + j]);
401 for(j = 0; j < SAMPLES_PER_BAND; j++){
402 c->Q[ch][off + j] = get_vlc2(gb, q9up_vlc.table, MPC8_Q9UP_BITS, 2);
404 c->Q[ch][off + j] <<= res - 9;
405 c->Q[ch][off + j] |= get_bits(gb, res - 9);
407 c->Q[ch][off + j] -= (1 << (res - 2)) - 1;
413 ff_mpc_dequantize_and_synth(c, maxband - 1,
414 (int16_t **)frame->extended_data,
419 c->last_bits_used = get_bits_count(gb);
420 if(get_bits_left(gb) < 8) // we have only padding left
421 c->last_bits_used = buf_size << 3;
422 if(c->cur_frame >= c->frames)
427 return c->cur_frame ? c->last_bits_used >> 3 : buf_size;
430 static av_cold void mpc8_decode_flush(AVCodecContext *avctx)
432 MPCContext *c = avctx->priv_data;
436 AVCodec ff_mpc8_decoder = {
438 .type = AVMEDIA_TYPE_AUDIO,
439 .id = AV_CODEC_ID_MUSEPACK8,
440 .priv_data_size = sizeof(MPCContext),
441 .init = mpc8_decode_init,
442 .decode = mpc8_decode_frame,
443 .flush = mpc8_decode_flush,
444 .capabilities = CODEC_CAP_DR1,
445 .long_name = NULL_IF_CONFIG_SMALL("Musepack SV8"),
446 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
447 AV_SAMPLE_FMT_NONE },