| 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 "avcodec.h" |
| 31 | #include "get_bits.h" |
| 32 | #include "internal.h" |
| 33 | #include "mpegaudiodsp.h" |
| 34 | |
| 35 | #include "mpc.h" |
| 36 | #include "mpc8data.h" |
| 37 | #include "mpc8huff.h" |
| 38 | |
| 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; |
| 41 | |
| 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 }; |
| 44 | |
| 45 | static inline int mpc8_dec_base(GetBitContext *gb, int k, int n) |
| 46 | { |
| 47 | int len = mpc8_cnk_len[k-1][n-1] - 1; |
| 48 | int code = len ? get_bits_long(gb, len) : 0; |
| 49 | |
| 50 | if (code >= mpc8_cnk_lost[k-1][n-1]) |
| 51 | code = ((code << 1) | get_bits1(gb)) - mpc8_cnk_lost[k-1][n-1]; |
| 52 | |
| 53 | return code; |
| 54 | } |
| 55 | |
| 56 | static inline int mpc8_dec_enum(GetBitContext *gb, int k, int n) |
| 57 | { |
| 58 | int bits = 0; |
| 59 | const uint32_t * C = mpc8_cnk[k-1]; |
| 60 | int code = mpc8_dec_base(gb, k, n); |
| 61 | |
| 62 | do { |
| 63 | n--; |
| 64 | if (code >= C[n]) { |
| 65 | bits |= 1 << n; |
| 66 | code -= C[n]; |
| 67 | C -= 32; |
| 68 | k--; |
| 69 | } |
| 70 | } while(k > 0); |
| 71 | |
| 72 | return bits; |
| 73 | } |
| 74 | |
| 75 | static inline int mpc8_get_mod_golomb(GetBitContext *gb, int m) |
| 76 | { |
| 77 | if(mpc8_cnk_len[0][m] < 1) return 0; |
| 78 | return mpc8_dec_base(gb, 1, m+1); |
| 79 | } |
| 80 | |
| 81 | static int mpc8_get_mask(GetBitContext *gb, int size, int t) |
| 82 | { |
| 83 | int mask = 0; |
| 84 | |
| 85 | if(t && t != size) |
| 86 | mask = mpc8_dec_enum(gb, FFMIN(t, size - t), size); |
| 87 | if((t << 1) > size) mask = ~mask; |
| 88 | |
| 89 | return mask; |
| 90 | } |
| 91 | |
| 92 | static const uint16_t vlc_offsets[13] = { |
| 93 | 0, 640, 1184, 1748, 2298, 2426, 2554, 3066, 3578, 4106, 4618, 5196, 5708 |
| 94 | }; |
| 95 | |
| 96 | static av_cold int mpc8_decode_init(AVCodecContext * avctx) |
| 97 | { |
| 98 | int i; |
| 99 | MPCContext *c = avctx->priv_data; |
| 100 | GetBitContext gb; |
| 101 | static int vlc_initialized = 0; |
| 102 | int channels; |
| 103 | |
| 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]; |
| 114 | |
| 115 | if(avctx->extradata_size < 2){ |
| 116 | av_log(avctx, AV_LOG_ERROR, "Too small extradata size (%i)!\n", avctx->extradata_size); |
| 117 | return -1; |
| 118 | } |
| 119 | memset(c->oldDSCF, 0, sizeof(c->oldDSCF)); |
| 120 | av_lfg_init(&c->rnd, 0xDEADBEEF); |
| 121 | ff_mpadsp_init(&c->mpadsp); |
| 122 | |
| 123 | ff_mpc_init(); |
| 124 | |
| 125 | init_get_bits(&gb, avctx->extradata, 16); |
| 126 | |
| 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; |
| 132 | } |
| 133 | channels = get_bits(&gb, 4) + 1; |
| 134 | if (channels > 2) { |
| 135 | avpriv_request_sample(avctx, "Multichannel MPC SV8"); |
| 136 | return AVERROR_PATCHWELCOME; |
| 137 | } |
| 138 | c->MSS = get_bits1(&gb); |
| 139 | c->frames = 1 << (get_bits(&gb, 3) * 2); |
| 140 | |
| 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; |
| 144 | |
| 145 | if(vlc_initialized) return 0; |
| 146 | av_log(avctx, AV_LOG_DEBUG, "Initing VLC\n"); |
| 147 | |
| 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); |
| 153 | |
| 154 | q1_vlc.table = q1_table; |
| 155 | q1_vlc.table_allocated = 520; |
| 156 | init_vlc(&q1_vlc, MPC8_Q1_BITS, MPC8_Q1_SIZE, |
| 157 | mpc8_q1_bits, 1, 1, |
| 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); |
| 164 | |
| 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); |
| 175 | |
| 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); |
| 186 | |
| 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, |
| 190 | mpc8_q3_bits, 1, 1, |
| 191 | mpc8_q3_codes, 1, 1, |
| 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, |
| 196 | mpc8_q4_bits, 1, 1, |
| 197 | mpc8_q4_codes, 1, 1, |
| 198 | mpc8_q4_syms, 1, 1, INIT_VLC_USE_NEW_STATIC); |
| 199 | |
| 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); |
| 206 | |
| 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); |
| 212 | |
| 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); |
| 233 | } |
| 234 | vlc_initialized = 1; |
| 235 | |
| 236 | return 0; |
| 237 | } |
| 238 | |
| 239 | static int mpc8_decode_frame(AVCodecContext * avctx, void *data, |
| 240 | int *got_frame_ptr, AVPacket *avpkt) |
| 241 | { |
| 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; |
| 249 | int off; |
| 250 | int maxband, keyframe; |
| 251 | int last[2]; |
| 252 | |
| 253 | /* get output buffer */ |
| 254 | frame->nb_samples = MPC_FRAME_SIZE; |
| 255 | if ((res = ff_get_buffer(avctx, frame, 0)) < 0) |
| 256 | return res; |
| 257 | |
| 258 | keyframe = c->cur_frame == 0; |
| 259 | |
| 260 | if(keyframe){ |
| 261 | memset(c->Q, 0, sizeof(c->Q)); |
| 262 | c->last_bits_used = 0; |
| 263 | } |
| 264 | init_get_bits(gb, buf, buf_size * 8); |
| 265 | skip_bits(gb, c->last_bits_used & 7); |
| 266 | |
| 267 | if(keyframe) |
| 268 | maxband = mpc8_get_mod_golomb(gb, c->maxbands + 1); |
| 269 | else{ |
| 270 | maxband = c->last_max_band + get_vlc2(gb, band_vlc.table, MPC8_BANDS_BITS, 2); |
| 271 | if(maxband > 32) maxband -= 33; |
| 272 | } |
| 273 | |
| 274 | if(maxband > c->maxbands + 1) { |
| 275 | av_log(avctx, AV_LOG_ERROR, "maxband %d too large\n",maxband); |
| 276 | return AVERROR_INVALIDDATA; |
| 277 | } |
| 278 | c->last_max_band = maxband; |
| 279 | |
| 280 | /* read subband indexes */ |
| 281 | if(maxband){ |
| 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]; |
| 288 | } |
| 289 | } |
| 290 | if(c->MSS){ |
| 291 | int mask; |
| 292 | |
| 293 | cnt = 0; |
| 294 | for(i = 0; i < maxband; i++) |
| 295 | if(bands[i].res[0] || bands[i].res[1]) |
| 296 | cnt++; |
| 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; |
| 302 | mask >>= 1; |
| 303 | } |
| 304 | } |
| 305 | } |
| 306 | for(i = maxband; i < c->maxbands; i++) |
| 307 | bands[i].res[0] = bands[i].res[1] = 0; |
| 308 | |
| 309 | if(keyframe){ |
| 310 | for(i = 0; i < 32; i++) |
| 311 | c->oldDSCF[0][i] = c->oldDSCF[1][i] = 1; |
| 312 | } |
| 313 | |
| 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; |
| 317 | if(cnt >= 0){ |
| 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; |
| 321 | } |
| 322 | } |
| 323 | } |
| 324 | |
| 325 | for(i = 0; i < maxband; i++){ |
| 326 | for(ch = 0; ch < 2; ch++){ |
| 327 | if(!bands[i].res[ch]) continue; |
| 328 | |
| 329 | if(c->oldDSCF[ch][i]){ |
| 330 | bands[i].scf_idx[ch][0] = get_bits(gb, 7) - 6; |
| 331 | c->oldDSCF[ch][i] = 0; |
| 332 | }else{ |
| 333 | t = get_vlc2(gb, dscf_vlc[1].table, MPC8_DSCF1_BITS, 2); |
| 334 | if(t == 64) |
| 335 | t += get_bits(gb, 6); |
| 336 | bands[i].scf_idx[ch][0] = ((bands[i].scf_idx[ch][2] + t - 25) & 0x7F) - 6; |
| 337 | } |
| 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]; |
| 341 | else{ |
| 342 | t = get_vlc2(gb, dscf_vlc[0].table, MPC8_DSCF0_BITS, 2); |
| 343 | if(t == 31) |
| 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; |
| 346 | } |
| 347 | } |
| 348 | } |
| 349 | } |
| 350 | |
| 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]; |
| 354 | switch(res){ |
| 355 | case -1: |
| 356 | for(j = 0; j < SAMPLES_PER_BAND; j++) |
| 357 | c->Q[ch][off + j] = (av_lfg_get(&c->rnd) & 0x3FC) - 510; |
| 358 | break; |
| 359 | case 0: |
| 360 | break; |
| 361 | case 1: |
| 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; |
| 367 | } |
| 368 | break; |
| 369 | case 2: |
| 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]; |
| 377 | } |
| 378 | break; |
| 379 | case 3: |
| 380 | case 4: |
| 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); |
| 385 | } |
| 386 | break; |
| 387 | case 5: |
| 388 | case 6: |
| 389 | case 7: |
| 390 | case 8: |
| 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]); |
| 396 | } |
| 397 | break; |
| 398 | default: |
| 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); |
| 401 | if(res != 9){ |
| 402 | c->Q[ch][off + j] <<= res - 9; |
| 403 | c->Q[ch][off + j] |= get_bits(gb, res - 9); |
| 404 | } |
| 405 | c->Q[ch][off + j] -= (1 << (res - 2)) - 1; |
| 406 | } |
| 407 | } |
| 408 | } |
| 409 | } |
| 410 | |
| 411 | ff_mpc_dequantize_and_synth(c, maxband - 1, |
| 412 | (int16_t **)frame->extended_data, |
| 413 | avctx->channels); |
| 414 | |
| 415 | c->cur_frame++; |
| 416 | |
| 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) |
| 421 | c->cur_frame = 0; |
| 422 | |
| 423 | *got_frame_ptr = 1; |
| 424 | |
| 425 | return c->cur_frame ? c->last_bits_used >> 3 : buf_size; |
| 426 | } |
| 427 | |
| 428 | static av_cold void mpc8_decode_flush(AVCodecContext *avctx) |
| 429 | { |
| 430 | MPCContext *c = avctx->priv_data; |
| 431 | c->cur_frame = 0; |
| 432 | } |
| 433 | |
| 434 | AVCodec ff_mpc8_decoder = { |
| 435 | .name = "mpc8", |
| 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 }, |
| 446 | }; |