FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/mpc8.c
Date: 2025-10-19 14:07:46
Exec Total Coverage
Lines: 203 225 90.2%
Functions: 8 9 88.9%
Branches: 122 141 86.5%
Line Branch Exec Source
1 /*
2 * Musepack SV8 decoder
3 * Copyright (c) 2007 Konstantin Shishkov
4 *
5 * This file is part of FFmpeg.
6 *
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.
11 *
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.
16 *
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
20 */
21
22 /**
23 * @file
24 * MPEG Audio Layer 1/2 -like codec with frames of 1152 samples
25 * divided into 32 subbands.
26 */
27
28 #include "libavutil/channel_layout.h"
29 #include "libavutil/lfg.h"
30 #include "libavutil/thread.h"
31 #include "avcodec.h"
32 #include "codec_internal.h"
33 #include "decode.h"
34 #include "get_bits.h"
35 #include "mpegaudiodsp.h"
36
37 #include "mpc.h"
38 #include "mpc8data.h"
39 #include "mpc8huff.h"
40
41 static VLC band_vlc, scfi_vlc[2], dscf_vlc[2], res_vlc[2];
42 static VLC q1_vlc, q2_vlc[2], q3_vlc[2], quant_vlc[4][2], q9up_vlc;
43
44 7797 static inline int mpc8_dec_base(GetBitContext *gb, int k, int n)
45 {
46 7797 int len = mpc8_cnk_len[k-1][n-1] - 1;
47
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 7797 int code = len ? get_bits_long(gb, len) : 0;
48
49
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 7797 if (code >= mpc8_cnk_lost[k-1][n-1])
50 3746 code = ((code << 1) | get_bits1(gb)) - mpc8_cnk_lost[k-1][n-1];
51
52 7797 return code;
53 }
54
55 7335 static inline int mpc8_dec_enum(GetBitContext *gb, int k, int n)
56 {
57 7335 int bits = 0;
58 7335 const uint32_t * C = mpc8_cnk[k-1];
59 7335 int code = mpc8_dec_base(gb, k, n);
60
61 do {
62 109711 n--;
63
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 109711 if (code >= C[n]) {
64 41077 bits |= 1U << n;
65 41077 code -= C[n];
66 41077 C -= 32;
67 41077 k--;
68 }
69
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 109711 } while(k > 0);
70
71 7335 return bits;
72 }
73
74 462 static inline int mpc8_get_mod_golomb(GetBitContext *gb, int m)
75 {
76
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 462 if(mpc8_cnk_len[0][m] < 1) return 0;
77 462 return mpc8_dec_base(gb, 1, m+1);
78 }
79
80 7492 static int mpc8_get_mask(GetBitContext *gb, int size, int t)
81 {
82 7492 int mask = 0;
83
84
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 7492 if(t && t != size)
85 7335 mask = mpc8_dec_enum(gb, FFMIN(t, size - t), size);
86
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 7492 if((t << 1) > size) mask = ~mask;
87
88 7492 return mask;
89 }
90
91 42 static av_cold void build_vlc(VLC *vlc, unsigned *buf_offset,
92 const uint8_t codes_counts[16],
93 const uint8_t **syms, int offset)
94 {
95 static VLCElem vlc_buf[9296];
96 uint8_t len[MPC8_MAX_VLC_SIZE];
97 42 unsigned num = 0;
98
99 42 vlc->table = &vlc_buf[*buf_offset];
100 42 vlc->table_allocated = FF_ARRAY_ELEMS(vlc_buf) - *buf_offset;
101
102
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 714 for (int i = 16; i > 0; i--)
103
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 3358 for (unsigned tmp = num + codes_counts[i - 1]; num < tmp; num++)
104 2686 len[num] = i;
105
106 42 ff_vlc_init_from_lengths(vlc, FFMIN(len[0], 9), num, len, 1,
107 *syms, 1, 1, offset, VLC_INIT_STATIC_OVERLONG, NULL);
108 42 *buf_offset += vlc->table_size;
109 42 *syms += num;
110 42 }
111
112 2 static av_cold void mpc8_init_static(void)
113 {
114 2 const uint8_t *q_syms = mpc8_q_syms, *bands_syms = mpc8_bands_syms;
115 2 const uint8_t *res_syms = mpc8_res_syms, *scfi_syms = mpc8_scfi_syms;
116 2 const uint8_t *dscf_syms = mpc8_dscf_syms;
117 2 unsigned offset = 0;
118
119 2 build_vlc(&band_vlc, &offset, mpc8_bands_len_counts, &bands_syms, 0);
120
121 2 build_vlc(&q1_vlc, &offset, mpc8_q1_len_counts, &q_syms, 0);
122 2 build_vlc(&q9up_vlc, &offset, mpc8_q9up_len_counts, &q_syms, 0);
123
124
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 6 for (int i = 0; i < 2; i++){
125 4 build_vlc(&scfi_vlc[i], &offset, mpc8_scfi_len_counts[i], &scfi_syms, 0);
126
127 4 build_vlc(&dscf_vlc[i], &offset, mpc8_dscf_len_counts[i], &dscf_syms, 0);
128
129 4 build_vlc(&res_vlc[i], &offset, mpc8_res_len_counts[i], &res_syms, 0);
130
131 4 build_vlc(&q2_vlc[i], &offset, mpc8_q2_len_counts[i], &q_syms, 0);
132 4 build_vlc(&q3_vlc[i], &offset, mpc8_q34_len_counts[i],
133 4 &q_syms, -48 - 16 * i);
134
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 20 for (int j = 0; j < 4; j++)
135 16 build_vlc(&quant_vlc[j][i], &offset, mpc8_q5_8_len_counts[i][j],
136 16 &q_syms, -((8 << j) - 1));
137 }
138 2 ff_mpa_synth_init_fixed();
139 2 }
140
141 3 static av_cold int mpc8_decode_init(AVCodecContext * avctx)
142 {
143 static AVOnce init_static_once = AV_ONCE_INIT;
144 3 MPCContext *c = avctx->priv_data;
145 GetBitContext gb;
146 int channels;
147
148
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 3 if(avctx->extradata_size < 2){
149 ✗ av_log(avctx, AV_LOG_ERROR, "Too small extradata size (%i)!\n", avctx->extradata_size);
150 ✗ return -1;
151 }
152 3 memset(c->oldDSCF, 0, sizeof(c->oldDSCF));
153 3 av_lfg_init(&c->rnd, 0xDEADBEEF);
154 3 ff_mpadsp_init(&c->mpadsp);
155
156 3 init_get_bits(&gb, avctx->extradata, 16);
157
158 3 uint8_t sample_rate_idx = get_bits(&gb, 3);
159 static const int sample_rates[] = { 44100, 48000, 37800, 32000 };
160
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 3 if (sample_rate_idx >= FF_ARRAY_ELEMS(sample_rates)) {
161 ✗ av_log(avctx, AV_LOG_ERROR, "invalid sample rate index (%u)\n", sample_rate_idx);
162 ✗ return AVERROR_INVALIDDATA;
163 }
164 3 avctx->sample_rate = sample_rates[sample_rate_idx];
165 3 c->maxbands = get_bits(&gb, 5) + 1;
166
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 3 if (c->maxbands >= BANDS) {
167 ✗ av_log(avctx,AV_LOG_ERROR, "maxbands %d too high\n", c->maxbands);
168 ✗ return AVERROR_INVALIDDATA;
169 }
170 3 channels = get_bits(&gb, 4) + 1;
171
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 3 if (channels > 2) {
172 ✗ avpriv_request_sample(avctx, "Multichannel MPC SV8");
173 ✗ return AVERROR_PATCHWELCOME;
174 }
175 3 c->MSS = get_bits1(&gb);
176 3 c->frames = 1 << (get_bits(&gb, 3) * 2);
177
178 3 avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
179 3 av_channel_layout_uninit(&avctx->ch_layout);
180 3 av_channel_layout_default(&avctx->ch_layout, channels);
181
182 3 ff_thread_once(&init_static_once, mpc8_init_static);
183
184 3 return 0;
185 }
186
187 459 static int mpc8_decode_frame(AVCodecContext *avctx, AVFrame *frame,
188 int *got_frame_ptr, AVPacket *avpkt)
189 {
190 459 const uint8_t *buf = avpkt->data;
191 459 int buf_size = avpkt->size;
192 459 MPCContext *c = avctx->priv_data;
193 459 GetBitContext gb2, *gb = &gb2;
194 int i, j, k, ch, cnt, res, t;
195 459 Band *bands = c->bands;
196 int off;
197 int maxband, keyframe;
198 int last[2];
199
200 459 keyframe = c->cur_frame == 0;
201
202
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 459 if(keyframe){
203 10 memset(c->Q, 0, sizeof(c->Q));
204 10 c->last_bits_used = 0;
205 }
206
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 459 if ((res = init_get_bits8(gb, buf, buf_size)) < 0)
207 ✗ return res;
208
209 459 skip_bits(gb, c->last_bits_used & 7);
210
211
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 459 if(keyframe)
212 10 maxband = mpc8_get_mod_golomb(gb, c->maxbands + 1);
213 else{
214 449 maxband = c->last_max_band + get_vlc2(gb, band_vlc.table, MPC8_BANDS_BITS, 2);
215
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 449 if(maxband > 32) maxband -= 33;
216 }
217
218
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 459 if (get_bits_left(gb) < 0) {
219 1 *got_frame_ptr = 0;
220 1 return buf_size;
221 }
222
223
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 458 if(maxband > c->maxbands + 1) {
224 ✗ av_log(avctx, AV_LOG_ERROR, "maxband %d too large\n",maxband);
225 ✗ return AVERROR_INVALIDDATA;
226 }
227 458 c->last_max_band = maxband;
228
229 /* read subband indexes */
230
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 458 if(maxband){
231 452 last[0] = last[1] = 0;
232
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 10866 for(i = maxband - 1; i >= 0; i--){
233
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 31242 for(ch = 0; ch < 2; ch++){
234 20828 last[ch] = get_vlc2(gb, res_vlc[last[ch] > 2].table, MPC8_RES_BITS, 2) + last[ch];
235
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 20828 if(last[ch] > 15) last[ch] -= 17;
236 20828 bands[i].res[ch] = last[ch];
237 }
238 }
239
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 452 if(c->MSS){
240 int mask;
241
242 452 cnt = 0;
243
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 10866 for(i = 0; i < maxband; i++)
244
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 10414 if(bands[i].res[0] || bands[i].res[1])
245 10414 cnt++;
246 452 t = mpc8_get_mod_golomb(gb, cnt);
247 452 mask = mpc8_get_mask(gb, cnt, t);
248
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 10866 for(i = maxband - 1; i >= 0; i--)
249
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 10414 if(bands[i].res[0] || bands[i].res[1]){
250 10414 bands[i].msf = mask & 1;
251 10414 mask >>= 1;
252 }
253 }
254 }
255
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 2868 for(i = maxband; i < c->maxbands; i++)
256 2410 bands[i].res[0] = bands[i].res[1] = 0;
257
258
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 458 if(keyframe){
259
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 330 for(i = 0; i < 32; i++)
260 320 c->oldDSCF[0][i] = c->oldDSCF[1][i] = 1;
261 }
262
263
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 10872 for(i = 0; i < maxband; i++){
264
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 10414 if(bands[i].res[0] || bands[i].res[1]){
265 10414 cnt = !!bands[i].res[0] + !!bands[i].res[1] - 1;
266
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 10414 if(cnt >= 0){
267 10414 t = get_vlc2(gb, scfi_vlc[cnt].table, scfi_vlc[cnt].bits, 1);
268
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 10414 if(bands[i].res[0]) bands[i].scfi[0] = t >> (2 * cnt);
269
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 10414 if(bands[i].res[1]) bands[i].scfi[1] = t & 3;
270 }
271 }
272 }
273
274
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 10872 for(i = 0; i < maxband; i++){
275
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 31242 for(ch = 0; ch < 2; ch++){
276
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 20828 if(!bands[i].res[ch]) continue;
277
278
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 18282 if(c->oldDSCF[ch][i]){
279 388 bands[i].scf_idx[ch][0] = get_bits(gb, 7) - 6;
280 388 c->oldDSCF[ch][i] = 0;
281 }else{
282 17894 t = get_vlc2(gb, dscf_vlc[1].table, MPC8_DSCF1_BITS, 2);
283
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 17894 if(t == 64)
284 50 t += get_bits(gb, 6);
285 17894 bands[i].scf_idx[ch][0] = ((bands[i].scf_idx[ch][2] + t - 25) & 0x7F) - 6;
286 }
287
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 54846 for(j = 0; j < 2; j++){
288
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 36564 if((bands[i].scfi[ch] << j) & 2)
289 23434 bands[i].scf_idx[ch][j + 1] = bands[i].scf_idx[ch][j];
290 else{
291 13130 t = get_vlc2(gb, dscf_vlc[0].table, MPC8_DSCF0_BITS, 2);
292
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 13130 if(t == 31)
293 98 t = 64 + get_bits(gb, 6);
294 13130 bands[i].scf_idx[ch][j + 1] = ((bands[i].scf_idx[ch][j] + t - 25) & 0x7F) - 6;
295 }
296 }
297 }
298 }
299
300
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 10872 for(i = 0, off = 0; i < maxband; i++, off += SAMPLES_PER_BAND){
301
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 31242 for(ch = 0; ch < 2; ch++){
302 20828 res = bands[i].res[ch];
303
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 20828 switch(res){
304 ✗ case -1:
305 ✗ for(j = 0; j < SAMPLES_PER_BAND; j++)
306 ✗ c->Q[ch][off + j] = (av_lfg_get(&c->rnd) & 0x3FC) - 510;
307 ✗ break;
308 2546 case 0:
309 2546 break;
310 3520 case 1:
311
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 10560 for(j = 0; j < SAMPLES_PER_BAND; j += SAMPLES_PER_BAND / 2){
312 7040 cnt = get_vlc2(gb, q1_vlc.table, MPC8_Q1_BITS, 2);
313 7040 t = mpc8_get_mask(gb, 18, cnt);
314
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 133760 for(k = 0; k < SAMPLES_PER_BAND / 2; k++)
315 126720 c->Q[ch][off + j + k] = t & (1 << (SAMPLES_PER_BAND / 2 - k - 1))
316
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 126720 ? (get_bits1(gb) << 1) - 1 : 0;
317 }
318 3520 break;
319 6121 case 2:
320 6121 cnt = 6;//2*mpc8_thres[res]
321
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 79573 for(j = 0; j < SAMPLES_PER_BAND; j += 3){
322 73452 t = get_vlc2(gb, q2_vlc[cnt > 3].table, MPC8_Q2_BITS, 2);
323 73452 c->Q[ch][off + j + 0] = mpc8_idx50[t];
324 73452 c->Q[ch][off + j + 1] = mpc8_idx51[t];
325 73452 c->Q[ch][off + j + 2] = mpc8_idx52[t];
326 73452 cnt = (cnt >> 1) + mpc8_huffq2[t];
327 }
328 6121 break;
329 4822 case 3:
330 case 4:
331
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 91618 for(j = 0; j < SAMPLES_PER_BAND; j += 2){
332 86796 t = get_vlc2(gb, q3_vlc[res - 3].table, MPC8_Q3_BITS, 2);
333 86796 c->Q[ch][off + j + 1] = t >> 4;
334 86796 c->Q[ch][off + j + 0] = sign_extend(t, 4);
335 }
336 4822 break;
337 3454 case 5:
338 case 6:
339 case 7:
340 case 8:
341 3454 cnt = 2 * mpc8_thres[res];
342
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 127798 for(j = 0; j < SAMPLES_PER_BAND; j++){
343 124344 const VLC *vlc = &quant_vlc[res - 5][cnt > mpc8_thres[res]];
344 124344 c->Q[ch][off + j] = get_vlc2(gb, vlc->table, vlc->bits, 2);
345 124344 cnt = (cnt >> 1) + FFABS(c->Q[ch][off + j]);
346 }
347 3454 break;
348 365 default:
349
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 13505 for(j = 0; j < SAMPLES_PER_BAND; j++){
350 13140 c->Q[ch][off + j] = get_vlc2(gb, q9up_vlc.table, MPC8_Q9UP_BITS, 2);
351
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 13140 if(res != 9){
352 5544 c->Q[ch][off + j] <<= res - 9;
353 5544 c->Q[ch][off + j] |= get_bits(gb, res - 9);
354 }
355 13140 c->Q[ch][off + j] -= (1 << (res - 2)) - 1;
356 }
357 }
358 }
359 }
360
361 458 frame->nb_samples = MPC_FRAME_SIZE;
362
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 458 if ((res = ff_get_buffer(avctx, frame, 0)) < 0)
363 ✗ return res;
364
365 458 ff_mpc_dequantize_and_synth(c, maxband - 1,
366 458 (int16_t **)frame->extended_data,
367 avctx->ch_layout.nb_channels);
368
369 458 c->cur_frame++;
370
371 458 c->last_bits_used = get_bits_count(gb);
372
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 458 if(c->cur_frame >= c->frames)
373 7 c->cur_frame = 0;
374
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 458 if (get_bits_left(gb) < 0) {
375 ✗ av_log(avctx, AV_LOG_ERROR, "Overread %d\n", -get_bits_left(gb));
376 ✗ c->last_bits_used = buf_size << 3;
377
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 458 } else if (c->cur_frame == 0 && get_bits_left(gb) < 8) {// we have only padding left
378 7 c->last_bits_used = buf_size << 3;
379 }
380
381 458 *got_frame_ptr = 1;
382
383
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 458 return c->cur_frame ? c->last_bits_used >> 3 : buf_size;
384 }
385
386 ✗ static av_cold void mpc8_decode_flush(AVCodecContext *avctx)
387 {
388 ✗ MPCContext *c = avctx->priv_data;
389 ✗ c->cur_frame = 0;
390 ✗ }
391
392 const FFCodec ff_mpc8_decoder = {
393 .p.name = "mpc8",
394 CODEC_LONG_NAME("Musepack SV8"),
395 .p.type = AVMEDIA_TYPE_AUDIO,
396 .p.id = AV_CODEC_ID_MUSEPACK8,
397 .priv_data_size = sizeof(MPCContext),
398 .init = mpc8_decode_init,
399 FF_CODEC_DECODE_CB(mpc8_decode_frame),
400 .flush = mpc8_decode_flush,
401 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_CHANNEL_CONF,
402 CODEC_SAMPLEFMTS(AV_SAMPLE_FMT_S16P),
403 };
404