static av_cold int mpc8_decode_init(AVCodecContext * avctx) { int i; MPCContext *c = avctx->priv_data; GetBitContext gb; static int vlc_initialized = 0; static VLC_TYPE band_table[542][2]; static VLC_TYPE q1_table[520][2]; static VLC_TYPE q9up_table[524][2]; static VLC_TYPE scfi0_table[1 << MPC8_SCFI0_BITS][2]; static VLC_TYPE scfi1_table[1 << MPC8_SCFI1_BITS][2]; static VLC_TYPE dscf0_table[560][2]; static VLC_TYPE dscf1_table[598][2]; static VLC_TYPE q3_0_table[512][2]; static VLC_TYPE q3_1_table[516][2]; static VLC_TYPE codes_table[5708][2]; if(avctx->extradata_size < 2){ av_log(avctx, AV_LOG_ERROR, "Too small extradata size (%i)!\n", avctx->extradata_size); return -1; } memset(c->oldDSCF, 0, sizeof(c->oldDSCF)); av_lfg_init(&c->rnd, 0xDEADBEEF); dsputil_init(&c->dsp, avctx); ff_mpc_init(); init_get_bits(&gb, avctx->extradata, 16); skip_bits(&gb, 3);//sample rate c->maxbands = get_bits(&gb, 5) + 1; skip_bits(&gb, 4);//channels c->MSS = get_bits1(&gb); c->frames = 1 << (get_bits(&gb, 3) * 2); if(vlc_initialized) return 0; av_log(avctx, AV_LOG_DEBUG, "Initing VLC\n"); band_vlc.table = band_table; band_vlc.table_allocated = 542; init_vlc(&band_vlc, MPC8_BANDS_BITS, MPC8_BANDS_SIZE, mpc8_bands_bits, 1, 1, mpc8_bands_codes, 1, 1, INIT_VLC_USE_NEW_STATIC); q1_vlc.table = q1_table; q1_vlc.table_allocated = 520; init_vlc(&q1_vlc, MPC8_Q1_BITS, MPC8_Q1_SIZE, mpc8_q1_bits, 1, 1, mpc8_q1_codes, 1, 1, INIT_VLC_USE_NEW_STATIC); q9up_vlc.table = q9up_table; q9up_vlc.table_allocated = 524; init_vlc(&q9up_vlc, MPC8_Q9UP_BITS, MPC8_Q9UP_SIZE, mpc8_q9up_bits, 1, 1, mpc8_q9up_codes, 1, 1, INIT_VLC_USE_NEW_STATIC); scfi_vlc[0].table = scfi0_table; scfi_vlc[0].table_allocated = 1 << MPC8_SCFI0_BITS; init_vlc(&scfi_vlc[0], MPC8_SCFI0_BITS, MPC8_SCFI0_SIZE, mpc8_scfi0_bits, 1, 1, mpc8_scfi0_codes, 1, 1, INIT_VLC_USE_NEW_STATIC); scfi_vlc[1].table = scfi1_table; scfi_vlc[1].table_allocated = 1 << MPC8_SCFI1_BITS; init_vlc(&scfi_vlc[1], MPC8_SCFI1_BITS, MPC8_SCFI1_SIZE, mpc8_scfi1_bits, 1, 1, mpc8_scfi1_codes, 1, 1, INIT_VLC_USE_NEW_STATIC); dscf_vlc[0].table = dscf0_table; dscf_vlc[0].table_allocated = 560; init_vlc(&dscf_vlc[0], MPC8_DSCF0_BITS, MPC8_DSCF0_SIZE, mpc8_dscf0_bits, 1, 1, mpc8_dscf0_codes, 1, 1, INIT_VLC_USE_NEW_STATIC); dscf_vlc[1].table = dscf1_table; dscf_vlc[1].table_allocated = 598; init_vlc(&dscf_vlc[1], MPC8_DSCF1_BITS, MPC8_DSCF1_SIZE, mpc8_dscf1_bits, 1, 1, mpc8_dscf1_codes, 1, 1, INIT_VLC_USE_NEW_STATIC); q3_vlc[0].table = q3_0_table; q3_vlc[0].table_allocated = 512; init_vlc_sparse(&q3_vlc[0], MPC8_Q3_BITS, MPC8_Q3_SIZE, mpc8_q3_bits, 1, 1, mpc8_q3_codes, 1, 1, mpc8_q3_syms, 1, 1, INIT_VLC_USE_NEW_STATIC); q3_vlc[1].table = q3_1_table; q3_vlc[1].table_allocated = 516; init_vlc_sparse(&q3_vlc[1], MPC8_Q4_BITS, MPC8_Q4_SIZE, mpc8_q4_bits, 1, 1, mpc8_q4_codes, 1, 1, mpc8_q4_syms, 1, 1, INIT_VLC_USE_NEW_STATIC); for(i = 0; i < 2; i++){ res_vlc[i].table = &codes_table[vlc_offsets[0+i]]; res_vlc[i].table_allocated = vlc_offsets[1+i] - vlc_offsets[0+i]; init_vlc(&res_vlc[i], MPC8_RES_BITS, MPC8_RES_SIZE, &mpc8_res_bits[i], 1, 1, &mpc8_res_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC); q2_vlc[i].table = &codes_table[vlc_offsets[2+i]]; q2_vlc[i].table_allocated = vlc_offsets[3+i] - vlc_offsets[2+i]; init_vlc(&q2_vlc[i], MPC8_Q2_BITS, MPC8_Q2_SIZE, &mpc8_q2_bits[i], 1, 1, &mpc8_q2_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC); quant_vlc[0][i].table = &codes_table[vlc_offsets[4+i]]; quant_vlc[0][i].table_allocated = vlc_offsets[5+i] - vlc_offsets[4+i]; init_vlc(&quant_vlc[0][i], MPC8_Q5_BITS, MPC8_Q5_SIZE, &mpc8_q5_bits[i], 1, 1, &mpc8_q5_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC); quant_vlc[1][i].table = &codes_table[vlc_offsets[6+i]]; quant_vlc[1][i].table_allocated = vlc_offsets[7+i] - vlc_offsets[6+i]; init_vlc(&quant_vlc[1][i], MPC8_Q6_BITS, MPC8_Q6_SIZE, &mpc8_q6_bits[i], 1, 1, &mpc8_q6_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC); quant_vlc[2][i].table = &codes_table[vlc_offsets[8+i]]; quant_vlc[2][i].table_allocated = vlc_offsets[9+i] - vlc_offsets[8+i]; init_vlc(&quant_vlc[2][i], MPC8_Q7_BITS, MPC8_Q7_SIZE, &mpc8_q7_bits[i], 1, 1, &mpc8_q7_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC); quant_vlc[3][i].table = &codes_table[vlc_offsets[10+i]]; quant_vlc[3][i].table_allocated = vlc_offsets[11+i] - vlc_offsets[10+i]; init_vlc(&quant_vlc[3][i], MPC8_Q8_BITS, MPC8_Q8_SIZE, &mpc8_q8_bits[i], 1, 1, &mpc8_q8_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC); } vlc_initialized = 1; avctx->sample_fmt = SAMPLE_FMT_S16; avctx->channel_layout = (avctx->channels==2) ? CH_LAYOUT_STEREO : CH_LAYOUT_MONO; return 0; }