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/lfg.h"
32 #include "mpegaudiodsp.h"
33 #include "libavutil/audioconvert.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_dsputil_init(&c->dsp, avctx);
122 ff_mpadsp_init(&c->mpadsp);
126 init_get_bits(&gb, avctx->extradata, 16);
128 skip_bits(&gb, 3);//sample rate
129 c->maxbands = get_bits(&gb, 5) + 1;
130 if (c->maxbands >= BANDS)
131 return AVERROR_INVALIDDATA;
132 channels = get_bits(&gb, 4) + 1;
134 av_log_missing_feature(avctx, "Multichannel MPC SV8", 1);
137 c->MSS = get_bits1(&gb);
138 c->frames = 1 << (get_bits(&gb, 3) * 2);
140 avctx->sample_fmt = AV_SAMPLE_FMT_S16;
141 avctx->channel_layout = (avctx->channels==2) ? AV_CH_LAYOUT_STEREO : AV_CH_LAYOUT_MONO;
143 if(vlc_initialized) return 0;
144 av_log(avctx, AV_LOG_DEBUG, "Initing VLC\n");
146 band_vlc.table = band_table;
147 band_vlc.table_allocated = 542;
148 init_vlc(&band_vlc, MPC8_BANDS_BITS, MPC8_BANDS_SIZE,
149 mpc8_bands_bits, 1, 1,
150 mpc8_bands_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
152 q1_vlc.table = q1_table;
153 q1_vlc.table_allocated = 520;
154 init_vlc(&q1_vlc, MPC8_Q1_BITS, MPC8_Q1_SIZE,
156 mpc8_q1_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
157 q9up_vlc.table = q9up_table;
158 q9up_vlc.table_allocated = 524;
159 init_vlc(&q9up_vlc, MPC8_Q9UP_BITS, MPC8_Q9UP_SIZE,
160 mpc8_q9up_bits, 1, 1,
161 mpc8_q9up_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
163 scfi_vlc[0].table = scfi0_table;
164 scfi_vlc[0].table_allocated = 1 << MPC8_SCFI0_BITS;
165 init_vlc(&scfi_vlc[0], MPC8_SCFI0_BITS, MPC8_SCFI0_SIZE,
166 mpc8_scfi0_bits, 1, 1,
167 mpc8_scfi0_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
168 scfi_vlc[1].table = scfi1_table;
169 scfi_vlc[1].table_allocated = 1 << MPC8_SCFI1_BITS;
170 init_vlc(&scfi_vlc[1], MPC8_SCFI1_BITS, MPC8_SCFI1_SIZE,
171 mpc8_scfi1_bits, 1, 1,
172 mpc8_scfi1_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
174 dscf_vlc[0].table = dscf0_table;
175 dscf_vlc[0].table_allocated = 560;
176 init_vlc(&dscf_vlc[0], MPC8_DSCF0_BITS, MPC8_DSCF0_SIZE,
177 mpc8_dscf0_bits, 1, 1,
178 mpc8_dscf0_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
179 dscf_vlc[1].table = dscf1_table;
180 dscf_vlc[1].table_allocated = 598;
181 init_vlc(&dscf_vlc[1], MPC8_DSCF1_BITS, MPC8_DSCF1_SIZE,
182 mpc8_dscf1_bits, 1, 1,
183 mpc8_dscf1_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
185 q3_vlc[0].table = q3_0_table;
186 q3_vlc[0].table_allocated = 512;
187 ff_init_vlc_sparse(&q3_vlc[0], MPC8_Q3_BITS, MPC8_Q3_SIZE,
190 mpc8_q3_syms, 1, 1, INIT_VLC_USE_NEW_STATIC);
191 q3_vlc[1].table = q3_1_table;
192 q3_vlc[1].table_allocated = 516;
193 ff_init_vlc_sparse(&q3_vlc[1], MPC8_Q4_BITS, MPC8_Q4_SIZE,
196 mpc8_q4_syms, 1, 1, INIT_VLC_USE_NEW_STATIC);
198 for(i = 0; i < 2; i++){
199 res_vlc[i].table = &codes_table[vlc_offsets[0+i]];
200 res_vlc[i].table_allocated = vlc_offsets[1+i] - vlc_offsets[0+i];
201 init_vlc(&res_vlc[i], MPC8_RES_BITS, MPC8_RES_SIZE,
202 &mpc8_res_bits[i], 1, 1,
203 &mpc8_res_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
205 q2_vlc[i].table = &codes_table[vlc_offsets[2+i]];
206 q2_vlc[i].table_allocated = vlc_offsets[3+i] - vlc_offsets[2+i];
207 init_vlc(&q2_vlc[i], MPC8_Q2_BITS, MPC8_Q2_SIZE,
208 &mpc8_q2_bits[i], 1, 1,
209 &mpc8_q2_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
211 quant_vlc[0][i].table = &codes_table[vlc_offsets[4+i]];
212 quant_vlc[0][i].table_allocated = vlc_offsets[5+i] - vlc_offsets[4+i];
213 init_vlc(&quant_vlc[0][i], MPC8_Q5_BITS, MPC8_Q5_SIZE,
214 &mpc8_q5_bits[i], 1, 1,
215 &mpc8_q5_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
216 quant_vlc[1][i].table = &codes_table[vlc_offsets[6+i]];
217 quant_vlc[1][i].table_allocated = vlc_offsets[7+i] - vlc_offsets[6+i];
218 init_vlc(&quant_vlc[1][i], MPC8_Q6_BITS, MPC8_Q6_SIZE,
219 &mpc8_q6_bits[i], 1, 1,
220 &mpc8_q6_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
221 quant_vlc[2][i].table = &codes_table[vlc_offsets[8+i]];
222 quant_vlc[2][i].table_allocated = vlc_offsets[9+i] - vlc_offsets[8+i];
223 init_vlc(&quant_vlc[2][i], MPC8_Q7_BITS, MPC8_Q7_SIZE,
224 &mpc8_q7_bits[i], 1, 1,
225 &mpc8_q7_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
226 quant_vlc[3][i].table = &codes_table[vlc_offsets[10+i]];
227 quant_vlc[3][i].table_allocated = vlc_offsets[11+i] - vlc_offsets[10+i];
228 init_vlc(&quant_vlc[3][i], MPC8_Q8_BITS, MPC8_Q8_SIZE,
229 &mpc8_q8_bits[i], 1, 1,
230 &mpc8_q8_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
234 avcodec_get_frame_defaults(&c->frame);
235 avctx->coded_frame = &c->frame;
240 static int mpc8_decode_frame(AVCodecContext * avctx, void *data,
241 int *got_frame_ptr, AVPacket *avpkt)
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 c->frame.nb_samples = MPC_FRAME_SIZE;
255 if ((res = avctx->get_buffer(avctx, &c->frame)) < 0) {
256 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
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;
275 if(maxband > c->maxbands)
276 return AVERROR_INVALIDDATA;
277 c->last_max_band = maxband;
279 /* read subband indexes */
281 last[0] = last[1] = 0;
282 for(i = maxband - 1; i >= 0; i--){
283 for(ch = 0; ch < 2; ch++){
284 last[ch] = get_vlc2(gb, res_vlc[last[ch] > 2].table, MPC8_RES_BITS, 2) + last[ch];
285 if(last[ch] > 15) last[ch] -= 17;
286 bands[i].res[ch] = last[ch];
293 for(i = 0; i < maxband; i++)
294 if(bands[i].res[0] || bands[i].res[1])
296 t = mpc8_get_mod_golomb(gb, cnt);
297 mask = mpc8_get_mask(gb, cnt, t);
298 for(i = maxband - 1; i >= 0; i--)
299 if(bands[i].res[0] || bands[i].res[1]){
300 bands[i].msf = mask & 1;
305 for(i = maxband; i < c->maxbands; i++)
306 bands[i].res[0] = bands[i].res[1] = 0;
309 for(i = 0; i < 32; i++)
310 c->oldDSCF[0][i] = c->oldDSCF[1][i] = 1;
313 for(i = 0; i < maxband; i++){
314 if(bands[i].res[0] || bands[i].res[1]){
315 cnt = !!bands[i].res[0] + !!bands[i].res[1] - 1;
317 t = get_vlc2(gb, scfi_vlc[cnt].table, scfi_vlc[cnt].bits, 1);
318 if(bands[i].res[0]) bands[i].scfi[0] = t >> (2 * cnt);
319 if(bands[i].res[1]) bands[i].scfi[1] = t & 3;
324 for(i = 0; i < maxband; i++){
325 for(ch = 0; ch < 2; ch++){
326 if(!bands[i].res[ch]) continue;
328 if(c->oldDSCF[ch][i]){
329 bands[i].scf_idx[ch][0] = get_bits(gb, 7) - 6;
330 c->oldDSCF[ch][i] = 0;
332 t = get_vlc2(gb, dscf_vlc[1].table, MPC8_DSCF1_BITS, 2);
334 t += get_bits(gb, 6);
335 bands[i].scf_idx[ch][0] = ((bands[i].scf_idx[ch][2] + t - 25) & 0x7F) - 6;
337 for(j = 0; j < 2; j++){
338 if((bands[i].scfi[ch] << j) & 2)
339 bands[i].scf_idx[ch][j + 1] = bands[i].scf_idx[ch][j];
341 t = get_vlc2(gb, dscf_vlc[0].table, MPC8_DSCF0_BITS, 2);
343 t = 64 + get_bits(gb, 6);
344 bands[i].scf_idx[ch][j + 1] = ((bands[i].scf_idx[ch][j] + t - 25) & 0x7F) - 6;
350 for(i = 0, off = 0; i < maxband; i++, off += SAMPLES_PER_BAND){
351 for(ch = 0; ch < 2; ch++){
352 res = bands[i].res[ch];
355 for(j = 0; j < SAMPLES_PER_BAND; j++)
356 c->Q[ch][off + j] = (av_lfg_get(&c->rnd) & 0x3FC) - 510;
361 for(j = 0; j < SAMPLES_PER_BAND; j += SAMPLES_PER_BAND / 2){
362 cnt = get_vlc2(gb, q1_vlc.table, MPC8_Q1_BITS, 2);
363 t = mpc8_get_mask(gb, 18, cnt);
364 for(k = 0; k < SAMPLES_PER_BAND / 2; k++, t <<= 1)
365 c->Q[ch][off + j + k] = (t & 0x20000) ? (get_bits1(gb) << 1) - 1 : 0;
369 cnt = 6;//2*mpc8_thres[res]
370 for(j = 0; j < SAMPLES_PER_BAND; j += 3){
371 t = get_vlc2(gb, q2_vlc[cnt > 3].table, MPC8_Q2_BITS, 2);
372 c->Q[ch][off + j + 0] = mpc8_idx50[t];
373 c->Q[ch][off + j + 1] = mpc8_idx51[t];
374 c->Q[ch][off + j + 2] = mpc8_idx52[t];
375 cnt = (cnt >> 1) + mpc8_huffq2[t];
380 for(j = 0; j < SAMPLES_PER_BAND; j += 2){
381 t = get_vlc2(gb, q3_vlc[res - 3].table, MPC8_Q3_BITS, 2) + q3_offsets[res - 3];
382 c->Q[ch][off + j + 1] = t >> 4;
383 c->Q[ch][off + j + 0] = (t & 8) ? (t & 0xF) - 16 : (t & 0xF);
390 cnt = 2 * mpc8_thres[res];
391 for(j = 0; j < SAMPLES_PER_BAND; j++){
392 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];
393 c->Q[ch][off + j] = t;
394 cnt = (cnt >> 1) + FFABS(c->Q[ch][off + j]);
398 for(j = 0; j < SAMPLES_PER_BAND; j++){
399 c->Q[ch][off + j] = get_vlc2(gb, q9up_vlc.table, MPC8_Q9UP_BITS, 2);
401 c->Q[ch][off + j] <<= res - 9;
402 c->Q[ch][off + j] |= get_bits(gb, res - 9);
404 c->Q[ch][off + j] -= (1 << (res - 2)) - 1;
410 ff_mpc_dequantize_and_synth(c, maxband, c->frame.data[0], avctx->channels);
414 c->last_bits_used = get_bits_count(gb);
415 if(c->cur_frame >= c->frames)
419 *(AVFrame *)data = c->frame;
421 return c->cur_frame ? c->last_bits_used >> 3 : buf_size;
424 AVCodec ff_mpc8_decoder = {
426 .type = AVMEDIA_TYPE_AUDIO,
427 .id = CODEC_ID_MUSEPACK8,
428 .priv_data_size = sizeof(MPCContext),
429 .init = mpc8_decode_init,
430 .decode = mpc8_decode_frame,
431 .capabilities = CODEC_CAP_DR1,
432 .long_name = NULL_IF_CONFIG_SMALL("Musepack SV8"),