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libavcodec/ac3dsp.h

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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 */
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