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"
33 #include "mpegaudiodsp.h"
39 static VLC band_vlc, scfi_vlc[2], dscf_vlc[2], res_vlc[2];
40 static VLC q1_vlc, q2_vlc[2], q3_vlc[2], quant_vlc[4][2], q9up_vlc;
42 static const int q3_offsets[2] = { MPC8_Q3_OFFSET, MPC8_Q4_OFFSET };
43 static const int quant_offsets[6] = { MPC8_Q5_OFFSET, MPC8_Q6_OFFSET, MPC8_Q7_OFFSET, MPC8_Q8_OFFSET };
45 static inline int mpc8_dec_base(GetBitContext *gb, int k, int n)
47 int len = mpc8_cnk_len[k-1][n-1] - 1;
48 int code = len ? get_bits_long(gb, len) : 0;
50 if (code >= mpc8_cnk_lost[k-1][n-1])
51 code = ((code << 1) | get_bits1(gb)) - mpc8_cnk_lost[k-1][n-1];
56 static inline int mpc8_dec_enum(GetBitContext *gb, int k, int n)
59 const uint32_t * C = mpc8_cnk[k-1];
60 int code = mpc8_dec_base(gb, k, n);
75 static inline int mpc8_get_mod_golomb(GetBitContext *gb, int m)
77 if(mpc8_cnk_len[0][m] < 1) return 0;
78 return mpc8_dec_base(gb, 1, m+1);
81 static int mpc8_get_mask(GetBitContext *gb, int size, int t)
86 mask = mpc8_dec_enum(gb, FFMIN(t, size - t), size);
87 if((t << 1) > size) mask = ~mask;
92 static const uint16_t vlc_offsets[13] = {
93 0, 640, 1184, 1748, 2298, 2426, 2554, 3066, 3578, 4106, 4618, 5196, 5708
96 static av_cold int mpc8_decode_init(AVCodecContext * avctx)
99 MPCContext *c = avctx->priv_data;
101 static int vlc_initialized = 0;
104 static VLC_TYPE band_table[542][2];
105 static VLC_TYPE q1_table[520][2];
106 static VLC_TYPE q9up_table[524][2];
107 static VLC_TYPE scfi0_table[1 << MPC8_SCFI0_BITS][2];
108 static VLC_TYPE scfi1_table[1 << MPC8_SCFI1_BITS][2];
109 static VLC_TYPE dscf0_table[560][2];
110 static VLC_TYPE dscf1_table[598][2];
111 static VLC_TYPE q3_0_table[512][2];
112 static VLC_TYPE q3_1_table[516][2];
113 static VLC_TYPE codes_table[5708][2];
115 if(avctx->extradata_size < 2){
116 av_log(avctx, AV_LOG_ERROR, "Too small extradata size (%i)!\n", avctx->extradata_size);
119 memset(c->oldDSCF, 0, sizeof(c->oldDSCF));
120 av_lfg_init(&c->rnd, 0xDEADBEEF);
121 ff_mpadsp_init(&c->mpadsp);
125 init_get_bits(&gb, avctx->extradata, 16);
127 skip_bits(&gb, 3);//sample rate
128 c->maxbands = get_bits(&gb, 5) + 1;
129 if (c->maxbands >= BANDS) {
130 av_log(avctx,AV_LOG_ERROR, "maxbands %d too high\n", c->maxbands);
131 return AVERROR_INVALIDDATA;
133 channels = get_bits(&gb, 4) + 1;
135 avpriv_request_sample(avctx, "Multichannel MPC SV8");
136 return AVERROR_PATCHWELCOME;
138 c->MSS = get_bits1(&gb);
139 c->frames = 1 << (get_bits(&gb, 3) * 2);
141 avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
142 avctx->channel_layout = (channels==2) ? AV_CH_LAYOUT_STEREO : AV_CH_LAYOUT_MONO;
143 avctx->channels = channels;
145 if(vlc_initialized) return 0;
146 av_log(avctx, AV_LOG_DEBUG, "Initing VLC\n");
148 band_vlc.table = band_table;
149 band_vlc.table_allocated = 542;
150 init_vlc(&band_vlc, MPC8_BANDS_BITS, MPC8_BANDS_SIZE,
151 mpc8_bands_bits, 1, 1,
152 mpc8_bands_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
154 q1_vlc.table = q1_table;
155 q1_vlc.table_allocated = 520;
156 init_vlc(&q1_vlc, MPC8_Q1_BITS, MPC8_Q1_SIZE,
158 mpc8_q1_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
159 q9up_vlc.table = q9up_table;
160 q9up_vlc.table_allocated = 524;
161 init_vlc(&q9up_vlc, MPC8_Q9UP_BITS, MPC8_Q9UP_SIZE,
162 mpc8_q9up_bits, 1, 1,
163 mpc8_q9up_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
165 scfi_vlc[0].table = scfi0_table;
166 scfi_vlc[0].table_allocated = 1 << MPC8_SCFI0_BITS;
167 init_vlc(&scfi_vlc[0], MPC8_SCFI0_BITS, MPC8_SCFI0_SIZE,
168 mpc8_scfi0_bits, 1, 1,
169 mpc8_scfi0_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
170 scfi_vlc[1].table = scfi1_table;
171 scfi_vlc[1].table_allocated = 1 << MPC8_SCFI1_BITS;
172 init_vlc(&scfi_vlc[1], MPC8_SCFI1_BITS, MPC8_SCFI1_SIZE,
173 mpc8_scfi1_bits, 1, 1,
174 mpc8_scfi1_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
176 dscf_vlc[0].table = dscf0_table;
177 dscf_vlc[0].table_allocated = 560;
178 init_vlc(&dscf_vlc[0], MPC8_DSCF0_BITS, MPC8_DSCF0_SIZE,
179 mpc8_dscf0_bits, 1, 1,
180 mpc8_dscf0_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
181 dscf_vlc[1].table = dscf1_table;
182 dscf_vlc[1].table_allocated = 598;
183 init_vlc(&dscf_vlc[1], MPC8_DSCF1_BITS, MPC8_DSCF1_SIZE,
184 mpc8_dscf1_bits, 1, 1,
185 mpc8_dscf1_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
187 q3_vlc[0].table = q3_0_table;
188 q3_vlc[0].table_allocated = 512;
189 ff_init_vlc_sparse(&q3_vlc[0], MPC8_Q3_BITS, MPC8_Q3_SIZE,
192 mpc8_q3_syms, 1, 1, INIT_VLC_USE_NEW_STATIC);
193 q3_vlc[1].table = q3_1_table;
194 q3_vlc[1].table_allocated = 516;
195 ff_init_vlc_sparse(&q3_vlc[1], MPC8_Q4_BITS, MPC8_Q4_SIZE,
198 mpc8_q4_syms, 1, 1, INIT_VLC_USE_NEW_STATIC);
200 for(i = 0; i < 2; i++){
201 res_vlc[i].table = &codes_table[vlc_offsets[0+i]];
202 res_vlc[i].table_allocated = vlc_offsets[1+i] - vlc_offsets[0+i];
203 init_vlc(&res_vlc[i], MPC8_RES_BITS, MPC8_RES_SIZE,
204 &mpc8_res_bits[i], 1, 1,
205 &mpc8_res_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
207 q2_vlc[i].table = &codes_table[vlc_offsets[2+i]];
208 q2_vlc[i].table_allocated = vlc_offsets[3+i] - vlc_offsets[2+i];
209 init_vlc(&q2_vlc[i], MPC8_Q2_BITS, MPC8_Q2_SIZE,
210 &mpc8_q2_bits[i], 1, 1,
211 &mpc8_q2_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
213 quant_vlc[0][i].table = &codes_table[vlc_offsets[4+i]];
214 quant_vlc[0][i].table_allocated = vlc_offsets[5+i] - vlc_offsets[4+i];
215 init_vlc(&quant_vlc[0][i], MPC8_Q5_BITS, MPC8_Q5_SIZE,
216 &mpc8_q5_bits[i], 1, 1,
217 &mpc8_q5_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
218 quant_vlc[1][i].table = &codes_table[vlc_offsets[6+i]];
219 quant_vlc[1][i].table_allocated = vlc_offsets[7+i] - vlc_offsets[6+i];
220 init_vlc(&quant_vlc[1][i], MPC8_Q6_BITS, MPC8_Q6_SIZE,
221 &mpc8_q6_bits[i], 1, 1,
222 &mpc8_q6_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
223 quant_vlc[2][i].table = &codes_table[vlc_offsets[8+i]];
224 quant_vlc[2][i].table_allocated = vlc_offsets[9+i] - vlc_offsets[8+i];
225 init_vlc(&quant_vlc[2][i], MPC8_Q7_BITS, MPC8_Q7_SIZE,
226 &mpc8_q7_bits[i], 1, 1,
227 &mpc8_q7_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
228 quant_vlc[3][i].table = &codes_table[vlc_offsets[10+i]];
229 quant_vlc[3][i].table_allocated = vlc_offsets[11+i] - vlc_offsets[10+i];
230 init_vlc(&quant_vlc[3][i], MPC8_Q8_BITS, MPC8_Q8_SIZE,
231 &mpc8_q8_bits[i], 1, 1,
232 &mpc8_q8_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
239 static int mpc8_decode_frame(AVCodecContext * avctx, void *data,
240 int *got_frame_ptr, AVPacket *avpkt)
242 AVFrame *frame = data;
243 const uint8_t *buf = avpkt->data;
244 int buf_size = avpkt->size;
245 MPCContext *c = avctx->priv_data;
246 GetBitContext gb2, *gb = &gb2;
247 int i, j, k, ch, cnt, res, t;
248 Band *bands = c->bands;
250 int maxband, keyframe;
253 /* get output buffer */
254 frame->nb_samples = MPC_FRAME_SIZE;
255 if ((res = ff_get_buffer(avctx, frame, 0)) < 0)
258 keyframe = c->cur_frame == 0;
261 memset(c->Q, 0, sizeof(c->Q));
262 c->last_bits_used = 0;
264 init_get_bits(gb, buf, buf_size * 8);
265 skip_bits(gb, c->last_bits_used & 7);
268 maxband = mpc8_get_mod_golomb(gb, c->maxbands + 1);
270 maxband = c->last_max_band + get_vlc2(gb, band_vlc.table, MPC8_BANDS_BITS, 2);
271 if(maxband > 32) maxband -= 33;
274 if(maxband > c->maxbands + 1) {
275 av_log(avctx, AV_LOG_ERROR, "maxband %d too large\n",maxband);
276 return AVERROR_INVALIDDATA;
278 c->last_max_band = maxband;
280 /* read subband indexes */
282 last[0] = last[1] = 0;
283 for(i = maxband - 1; i >= 0; i--){
284 for(ch = 0; ch < 2; ch++){
285 last[ch] = get_vlc2(gb, res_vlc[last[ch] > 2].table, MPC8_RES_BITS, 2) + last[ch];
286 if(last[ch] > 15) last[ch] -= 17;
287 bands[i].res[ch] = last[ch];
294 for(i = 0; i < maxband; i++)
295 if(bands[i].res[0] || bands[i].res[1])
297 t = mpc8_get_mod_golomb(gb, cnt);
298 mask = mpc8_get_mask(gb, cnt, t);
299 for(i = maxband - 1; i >= 0; i--)
300 if(bands[i].res[0] || bands[i].res[1]){
301 bands[i].msf = mask & 1;
306 for(i = maxband; i < c->maxbands; i++)
307 bands[i].res[0] = bands[i].res[1] = 0;
310 for(i = 0; i < 32; i++)
311 c->oldDSCF[0][i] = c->oldDSCF[1][i] = 1;
314 for(i = 0; i < maxband; i++){
315 if(bands[i].res[0] || bands[i].res[1]){
316 cnt = !!bands[i].res[0] + !!bands[i].res[1] - 1;
318 t = get_vlc2(gb, scfi_vlc[cnt].table, scfi_vlc[cnt].bits, 1);
319 if(bands[i].res[0]) bands[i].scfi[0] = t >> (2 * cnt);
320 if(bands[i].res[1]) bands[i].scfi[1] = t & 3;
325 for(i = 0; i < maxband; i++){
326 for(ch = 0; ch < 2; ch++){
327 if(!bands[i].res[ch]) continue;
329 if(c->oldDSCF[ch][i]){
330 bands[i].scf_idx[ch][0] = get_bits(gb, 7) - 6;
331 c->oldDSCF[ch][i] = 0;
333 t = get_vlc2(gb, dscf_vlc[1].table, MPC8_DSCF1_BITS, 2);
335 t += get_bits(gb, 6);
336 bands[i].scf_idx[ch][0] = ((bands[i].scf_idx[ch][2] + t - 25) & 0x7F) - 6;
338 for(j = 0; j < 2; j++){
339 if((bands[i].scfi[ch] << j) & 2)
340 bands[i].scf_idx[ch][j + 1] = bands[i].scf_idx[ch][j];
342 t = get_vlc2(gb, dscf_vlc[0].table, MPC8_DSCF0_BITS, 2);
344 t = 64 + get_bits(gb, 6);
345 bands[i].scf_idx[ch][j + 1] = ((bands[i].scf_idx[ch][j] + t - 25) & 0x7F) - 6;
351 for(i = 0, off = 0; i < maxband; i++, off += SAMPLES_PER_BAND){
352 for(ch = 0; ch < 2; ch++){
353 res = bands[i].res[ch];
356 for(j = 0; j < SAMPLES_PER_BAND; j++)
357 c->Q[ch][off + j] = (av_lfg_get(&c->rnd) & 0x3FC) - 510;
362 for(j = 0; j < SAMPLES_PER_BAND; j += SAMPLES_PER_BAND / 2){
363 cnt = get_vlc2(gb, q1_vlc.table, MPC8_Q1_BITS, 2);
364 t = mpc8_get_mask(gb, 18, cnt);
365 for(k = 0; k < SAMPLES_PER_BAND / 2; k++, t <<= 1)
366 c->Q[ch][off + j + k] = (t & 0x20000) ? (get_bits1(gb) << 1) - 1 : 0;
370 cnt = 6;//2*mpc8_thres[res]
371 for(j = 0; j < SAMPLES_PER_BAND; j += 3){
372 t = get_vlc2(gb, q2_vlc[cnt > 3].table, MPC8_Q2_BITS, 2);
373 c->Q[ch][off + j + 0] = mpc8_idx50[t];
374 c->Q[ch][off + j + 1] = mpc8_idx51[t];
375 c->Q[ch][off + j + 2] = mpc8_idx52[t];
376 cnt = (cnt >> 1) + mpc8_huffq2[t];
381 for(j = 0; j < SAMPLES_PER_BAND; j += 2){
382 t = get_vlc2(gb, q3_vlc[res - 3].table, MPC8_Q3_BITS, 2) + q3_offsets[res - 3];
383 c->Q[ch][off + j + 1] = t >> 4;
384 c->Q[ch][off + j + 0] = (t & 8) ? (t & 0xF) - 16 : (t & 0xF);
391 cnt = 2 * mpc8_thres[res];
392 for(j = 0; j < SAMPLES_PER_BAND; j++){
393 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];
394 c->Q[ch][off + j] = t;
395 cnt = (cnt >> 1) + FFABS(c->Q[ch][off + j]);
399 for(j = 0; j < SAMPLES_PER_BAND; j++){
400 c->Q[ch][off + j] = get_vlc2(gb, q9up_vlc.table, MPC8_Q9UP_BITS, 2);
402 c->Q[ch][off + j] <<= res - 9;
403 c->Q[ch][off + j] |= get_bits(gb, res - 9);
405 c->Q[ch][off + j] -= (1 << (res - 2)) - 1;
411 ff_mpc_dequantize_and_synth(c, maxband - 1,
412 (int16_t **)frame->extended_data,
417 c->last_bits_used = get_bits_count(gb);
418 if(get_bits_left(gb) < 8) // we have only padding left
419 c->last_bits_used = buf_size << 3;
420 if(c->cur_frame >= c->frames)
425 return c->cur_frame ? c->last_bits_used >> 3 : buf_size;
428 static av_cold void mpc8_decode_flush(AVCodecContext *avctx)
430 MPCContext *c = avctx->priv_data;
434 AVCodec ff_mpc8_decoder = {
436 .long_name = NULL_IF_CONFIG_SMALL("Musepack SV8"),
437 .type = AVMEDIA_TYPE_AUDIO,
438 .id = AV_CODEC_ID_MUSEPACK8,
439 .priv_data_size = sizeof(MPCContext),
440 .init = mpc8_decode_init,
441 .decode = mpc8_decode_frame,
442 .flush = mpc8_decode_flush,
443 .capabilities = CODEC_CAP_DR1,
444 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
445 AV_SAMPLE_FMT_NONE },