Libav 0.7.1
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00001 /* 00002 * AC-3 DSP utils 00003 * Copyright (c) 2011 Justin Ruggles 00004 * 00005 * This file is part of Libav. 00006 * 00007 * Libav is free software; you can redistribute it and/or 00008 * modify it under the terms of the GNU Lesser General Public 00009 * License as published by the Free Software Foundation; either 00010 * version 2.1 of the License, or (at your option) any later version. 00011 * 00012 * Libav is distributed in the hope that it will be useful, 00013 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00015 * Lesser General Public License for more details. 00016 * 00017 * You should have received a copy of the GNU Lesser General Public 00018 * License along with Libav; if not, write to the Free Software 00019 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00020 */ 00021 00022 #ifndef AVCODEC_AC3DSP_H 00023 #define AVCODEC_AC3DSP_H 00024 00025 #include <stdint.h> 00026 00031 extern const uint16_t ff_ac3_bap_bits[16]; 00032 00033 typedef struct AC3DSPContext { 00043 void (*ac3_exponent_min)(uint8_t *exp, int num_reuse_blocks, int nb_coefs); 00044 00054 int (*ac3_max_msb_abs_int16)(const int16_t *src, int len); 00055 00065 void (*ac3_lshift_int16)(int16_t *src, unsigned int len, unsigned int shift); 00066 00076 void (*ac3_rshift_int32)(int32_t *src, unsigned int len, unsigned int shift); 00077 00089 void (*float_to_fixed24)(int32_t *dst, const float *src, unsigned int len); 00090 00106 void (*bit_alloc_calc_bap)(int16_t *mask, int16_t *psd, int start, int end, 00107 int snr_offset, int floor, 00108 const uint8_t *bap_tab, uint8_t *bap); 00109 00117 void (*update_bap_counts)(uint16_t mant_cnt[16], uint8_t *bap, int len); 00118 00125 int (*compute_mantissa_size)(uint16_t mant_cnt[6][16]); 00126 00127 void (*extract_exponents)(uint8_t *exp, int32_t *coef, int nb_coefs); 00128 } AC3DSPContext; 00129 00130 void ff_ac3dsp_init (AC3DSPContext *c, int bit_exact); 00131 void ff_ac3dsp_init_arm(AC3DSPContext *c, int bit_exact); 00132 void ff_ac3dsp_init_x86(AC3DSPContext *c, int bit_exact); 00133 00134 #endif /* AVCODEC_AC3DSP_H */