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 codes_table[5708][2];
106 if(avctx->extradata_size < 2){
107 av_log(avctx, AV_LOG_ERROR, "Too small extradata size (%i)!\n", avctx->extradata_size);
110 memset(c->oldDSCF, 0, sizeof(c->oldDSCF));
111 av_lfg_init(&c->rnd, 0xDEADBEEF);
112 ff_mpadsp_init(&c->mpadsp);
114 init_get_bits(&gb, avctx->extradata, 16);
116 skip_bits(&gb, 3);//sample rate
117 c->maxbands = get_bits(&gb, 5) + 1;
118 if (c->maxbands >= BANDS) {
119 av_log(avctx,AV_LOG_ERROR, "maxbands %d too high\n", c->maxbands);
120 return AVERROR_INVALIDDATA;
122 channels = get_bits(&gb, 4) + 1;
124 avpriv_request_sample(avctx, "Multichannel MPC SV8");
125 return AVERROR_PATCHWELCOME;
127 c->MSS = get_bits1(&gb);
128 c->frames = 1 << (get_bits(&gb, 3) * 2);
130 avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
131 avctx->channel_layout = (channels==2) ? AV_CH_LAYOUT_STEREO : AV_CH_LAYOUT_MONO;
132 avctx->channels = channels;
134 if(vlc_initialized) return 0;
135 av_log(avctx, AV_LOG_DEBUG, "Initing VLC\n");
137 INIT_VLC_STATIC_FROM_LENGTHS(&band_vlc, MPC8_BANDS_BITS, MPC8_BANDS_SIZE,
139 mpc8_bands_syms, 1, 1, 0, 0, 542);
141 INIT_VLC_STATIC_FROM_LENGTHS(&q1_vlc, MPC8_Q1_BITS, MPC8_Q1_SIZE,
143 mpc8_q1_syms, 1, 1, 0, 0, 520);
144 INIT_VLC_STATIC_FROM_LENGTHS(&q9up_vlc, MPC8_Q9UP_BITS, MPC8_Q9UP_SIZE,
146 mpc8_q9up_syms, 1, 1, 0, 0, 524);
148 INIT_VLC_STATIC_FROM_LENGTHS(&scfi_vlc[0], MPC8_SCFI0_BITS, MPC8_SCFI0_SIZE,
150 mpc8_scfi0_syms, 1, 1, 0, 0, 1 << MPC8_SCFI0_BITS);
151 INIT_VLC_STATIC_FROM_LENGTHS(&scfi_vlc[1], MPC8_SCFI1_BITS, MPC8_SCFI1_SIZE,
153 mpc8_scfi1_syms, 1, 1, 0, 0, 1 << MPC8_SCFI1_BITS);
155 INIT_VLC_STATIC_FROM_LENGTHS(&dscf_vlc[0], MPC8_DSCF0_BITS, MPC8_DSCF0_SIZE,
157 mpc8_dscf0_syms, 1, 1, 0, 0, 560);
158 INIT_VLC_STATIC_FROM_LENGTHS(&dscf_vlc[1], MPC8_DSCF1_BITS, MPC8_DSCF1_SIZE,
160 mpc8_dscf1_syms, 1, 1, 0, 0, 598);
162 INIT_VLC_STATIC_FROM_LENGTHS(&q3_vlc[0], MPC8_Q3_BITS, MPC8_Q3_SIZE,
164 mpc8_q3_syms, 1, 1, 0, 0, 512);
165 INIT_VLC_STATIC_FROM_LENGTHS(&q3_vlc[1], MPC8_Q4_BITS, MPC8_Q4_SIZE,
167 mpc8_q4_syms, 1, 1, 0, 0, 516);
169 for(i = 0; i < 2; i++){
170 res_vlc[i].table = &codes_table[vlc_offsets[0+i]];
171 res_vlc[i].table_allocated = vlc_offsets[1+i] - vlc_offsets[0+i];
172 ff_init_vlc_from_lengths(&res_vlc[i], MPC8_RES_BITS, MPC8_RES_SIZE,
174 mpc8_res_syms[i], 1, 1,
175 0, INIT_VLC_USE_NEW_STATIC, NULL);
177 q2_vlc[i].table = &codes_table[vlc_offsets[2+i]];
178 q2_vlc[i].table_allocated = vlc_offsets[3+i] - vlc_offsets[2+i];
179 ff_init_vlc_from_lengths(&q2_vlc[i], MPC8_Q2_BITS, MPC8_Q2_SIZE,
181 mpc8_q2_syms[i], 1, 1,
182 0, INIT_VLC_USE_NEW_STATIC, NULL);
184 quant_vlc[0][i].table = &codes_table[vlc_offsets[4+i]];
185 quant_vlc[0][i].table_allocated = vlc_offsets[5+i] - vlc_offsets[4+i];
186 ff_init_vlc_from_lengths(&quant_vlc[0][i], MPC8_Q5_BITS, MPC8_Q5_SIZE,
188 mpc8_q5_syms[i], 1, 1,
189 0, INIT_VLC_USE_NEW_STATIC, NULL);
190 quant_vlc[1][i].table = &codes_table[vlc_offsets[6+i]];
191 quant_vlc[1][i].table_allocated = vlc_offsets[7+i] - vlc_offsets[6+i];
192 ff_init_vlc_from_lengths(&quant_vlc[1][i], MPC8_Q6_BITS, MPC8_Q6_SIZE,
194 mpc8_q6_syms[i], 1, 1,
195 0, INIT_VLC_USE_NEW_STATIC, NULL);
196 quant_vlc[2][i].table = &codes_table[vlc_offsets[8+i]];
197 quant_vlc[2][i].table_allocated = vlc_offsets[9+i] - vlc_offsets[8+i];
198 ff_init_vlc_from_lengths(&quant_vlc[2][i], MPC8_Q7_BITS, MPC8_Q7_SIZE,
200 mpc8_q7_syms[i], 1, 1,
201 0, INIT_VLC_USE_NEW_STATIC, NULL);
202 quant_vlc[3][i].table = &codes_table[vlc_offsets[10+i]];
203 quant_vlc[3][i].table_allocated = vlc_offsets[11+i] - vlc_offsets[10+i];
204 ff_init_vlc_from_lengths(&quant_vlc[3][i], MPC8_Q8_BITS, MPC8_Q8_SIZE,
206 mpc8_q8_syms[i], 1, 1,
207 0, INIT_VLC_USE_NEW_STATIC, NULL);
210 ff_mpa_synth_init_fixed();
215 static int mpc8_decode_frame(AVCodecContext * avctx, void *data,
216 int *got_frame_ptr, AVPacket *avpkt)
218 AVFrame *frame = data;
219 const uint8_t *buf = avpkt->data;
220 int buf_size = avpkt->size;
221 MPCContext *c = avctx->priv_data;
222 GetBitContext gb2, *gb = &gb2;
223 int i, j, k, ch, cnt, res, t;
224 Band *bands = c->bands;
226 int maxband, keyframe;
229 keyframe = c->cur_frame == 0;
232 memset(c->Q, 0, sizeof(c->Q));
233 c->last_bits_used = 0;
235 if ((res = init_get_bits8(gb, buf, buf_size)) < 0)
238 skip_bits(gb, c->last_bits_used & 7);
241 maxband = mpc8_get_mod_golomb(gb, c->maxbands + 1);
243 maxband = c->last_max_band + get_vlc2(gb, band_vlc.table, MPC8_BANDS_BITS, 2);
244 if(maxband > 32) maxband -= 33;
247 if (get_bits_left(gb) < 0) {
252 if(maxband > c->maxbands + 1) {
253 av_log(avctx, AV_LOG_ERROR, "maxband %d too large\n",maxband);
254 return AVERROR_INVALIDDATA;
256 c->last_max_band = maxband;
258 /* read subband indexes */
260 last[0] = last[1] = 0;
261 for(i = maxband - 1; i >= 0; i--){
262 for(ch = 0; ch < 2; ch++){
263 last[ch] = get_vlc2(gb, res_vlc[last[ch] > 2].table, MPC8_RES_BITS, 2) + last[ch];
264 if(last[ch] > 15) last[ch] -= 17;
265 bands[i].res[ch] = last[ch];
272 for(i = 0; i < maxband; i++)
273 if(bands[i].res[0] || bands[i].res[1])
275 t = mpc8_get_mod_golomb(gb, cnt);
276 mask = mpc8_get_mask(gb, cnt, t);
277 for(i = maxband - 1; i >= 0; i--)
278 if(bands[i].res[0] || bands[i].res[1]){
279 bands[i].msf = mask & 1;
284 for(i = maxband; i < c->maxbands; i++)
285 bands[i].res[0] = bands[i].res[1] = 0;
288 for(i = 0; i < 32; i++)
289 c->oldDSCF[0][i] = c->oldDSCF[1][i] = 1;
292 for(i = 0; i < maxband; i++){
293 if(bands[i].res[0] || bands[i].res[1]){
294 cnt = !!bands[i].res[0] + !!bands[i].res[1] - 1;
296 t = get_vlc2(gb, scfi_vlc[cnt].table, scfi_vlc[cnt].bits, 1);
297 if(bands[i].res[0]) bands[i].scfi[0] = t >> (2 * cnt);
298 if(bands[i].res[1]) bands[i].scfi[1] = t & 3;
303 for(i = 0; i < maxband; i++){
304 for(ch = 0; ch < 2; ch++){
305 if(!bands[i].res[ch]) continue;
307 if(c->oldDSCF[ch][i]){
308 bands[i].scf_idx[ch][0] = get_bits(gb, 7) - 6;
309 c->oldDSCF[ch][i] = 0;
311 t = get_vlc2(gb, dscf_vlc[1].table, MPC8_DSCF1_BITS, 2);
313 t += get_bits(gb, 6);
314 bands[i].scf_idx[ch][0] = ((bands[i].scf_idx[ch][2] + t - 25) & 0x7F) - 6;
316 for(j = 0; j < 2; j++){
317 if((bands[i].scfi[ch] << j) & 2)
318 bands[i].scf_idx[ch][j + 1] = bands[i].scf_idx[ch][j];
320 t = get_vlc2(gb, dscf_vlc[0].table, MPC8_DSCF0_BITS, 2);
322 t = 64 + get_bits(gb, 6);
323 bands[i].scf_idx[ch][j + 1] = ((bands[i].scf_idx[ch][j] + t - 25) & 0x7F) - 6;
329 for(i = 0, off = 0; i < maxband; i++, off += SAMPLES_PER_BAND){
330 for(ch = 0; ch < 2; ch++){
331 res = bands[i].res[ch];
334 for(j = 0; j < SAMPLES_PER_BAND; j++)
335 c->Q[ch][off + j] = (av_lfg_get(&c->rnd) & 0x3FC) - 510;
340 for(j = 0; j < SAMPLES_PER_BAND; j += SAMPLES_PER_BAND / 2){
341 cnt = get_vlc2(gb, q1_vlc.table, MPC8_Q1_BITS, 2);
342 t = mpc8_get_mask(gb, 18, cnt);
343 for(k = 0; k < SAMPLES_PER_BAND / 2; k++)
344 c->Q[ch][off + j + k] = t & (1 << (SAMPLES_PER_BAND / 2 - k - 1))
345 ? (get_bits1(gb) << 1) - 1 : 0;
349 cnt = 6;//2*mpc8_thres[res]
350 for(j = 0; j < SAMPLES_PER_BAND; j += 3){
351 t = get_vlc2(gb, q2_vlc[cnt > 3].table, MPC8_Q2_BITS, 2);
352 c->Q[ch][off + j + 0] = mpc8_idx50[t];
353 c->Q[ch][off + j + 1] = mpc8_idx51[t];
354 c->Q[ch][off + j + 2] = mpc8_idx52[t];
355 cnt = (cnt >> 1) + mpc8_huffq2[t];
360 for(j = 0; j < SAMPLES_PER_BAND; j += 2){
361 t = get_vlc2(gb, q3_vlc[res - 3].table, MPC8_Q3_BITS, 2) + q3_offsets[res - 3];
362 c->Q[ch][off + j + 1] = t >> 4;
363 c->Q[ch][off + j + 0] = sign_extend(t, 4);
370 cnt = 2 * mpc8_thres[res];
371 for(j = 0; j < SAMPLES_PER_BAND; j++){
372 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];
373 c->Q[ch][off + j] = t;
374 cnt = (cnt >> 1) + FFABS(c->Q[ch][off + j]);
378 for(j = 0; j < SAMPLES_PER_BAND; j++){
379 c->Q[ch][off + j] = get_vlc2(gb, q9up_vlc.table, MPC8_Q9UP_BITS, 2);
381 c->Q[ch][off + j] <<= res - 9;
382 c->Q[ch][off + j] |= get_bits(gb, res - 9);
384 c->Q[ch][off + j] -= (1 << (res - 2)) - 1;
390 frame->nb_samples = MPC_FRAME_SIZE;
391 if ((res = ff_get_buffer(avctx, frame, 0)) < 0)
394 ff_mpc_dequantize_and_synth(c, maxband - 1,
395 (int16_t **)frame->extended_data,
400 c->last_bits_used = get_bits_count(gb);
401 if(c->cur_frame >= c->frames)
403 if (get_bits_left(gb) < 0) {
404 av_log(avctx, AV_LOG_ERROR, "Overread %d\n", -get_bits_left(gb));
405 c->last_bits_used = buf_size << 3;
406 } else if (c->cur_frame == 0 && get_bits_left(gb) < 8) {// we have only padding left
407 c->last_bits_used = buf_size << 3;
412 return c->cur_frame ? c->last_bits_used >> 3 : buf_size;
415 static av_cold void mpc8_decode_flush(AVCodecContext *avctx)
417 MPCContext *c = avctx->priv_data;
421 AVCodec ff_mpc8_decoder = {
423 .long_name = NULL_IF_CONFIG_SMALL("Musepack SV8"),
424 .type = AVMEDIA_TYPE_AUDIO,
425 .id = AV_CODEC_ID_MUSEPACK8,
426 .priv_data_size = sizeof(MPCContext),
427 .init = mpc8_decode_init,
428 .decode = mpc8_decode_frame,
429 .flush = mpc8_decode_flush,
430 .capabilities = AV_CODEC_CAP_DR1,
431 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
432 AV_SAMPLE_FMT_NONE },