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libavcodec/mlp.h

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00001 /*
00002  * MLP codec common header file
00003  * Copyright (c) 2007-2008 Ian Caulfield
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg 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  * FFmpeg 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 FFmpeg; 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_MLP_H
00023 #define AVCODEC_MLP_H
00024 
00025 #include <stdint.h>
00026 
00027 #include "avcodec.h"
00028 
00030 #define MAX_MATRIX_CHANNEL_MLP      5
00031 #define MAX_MATRIX_CHANNEL_TRUEHD   7
00032 
00036 #define MAX_CHANNELS                8
00037 
00041 #define MAX_MATRICES_MLP            6
00042 #define MAX_MATRICES_TRUEHD         8
00043 #define MAX_MATRICES                8
00044 
00048 #define MAX_SUBSTREAMS      3
00049 
00051 #define MAX_RATEFACTOR      4
00052 
00053 #define MAX_SAMPLERATE      (MAX_RATEFACTOR * 48000)
00054 
00056 #define MAX_BLOCKSIZE       (40 * MAX_RATEFACTOR)
00057 
00058 #define MAX_BLOCKSIZE_POW2  (64 * MAX_RATEFACTOR)
00059 
00061 #define NUM_FILTERS         2
00062 
00064 #define MAX_FIR_ORDER       8
00065 #define MAX_IIR_ORDER       4
00066 
00068 #define END_OF_STREAM       0xd234d234
00069 
00070 #define FIR 0
00071 #define IIR 1
00072 
00074 typedef struct {
00075     uint8_t     order; 
00076     uint8_t     shift; 
00077 
00078     int32_t     state[MAX_FIR_ORDER];
00079 } FilterParams;
00080 
00082 typedef struct {
00083     FilterParams filter_params[NUM_FILTERS];
00084     int32_t     coeff[NUM_FILTERS][MAX_FIR_ORDER];
00085 
00086     int16_t     huff_offset;      
00087     int32_t     sign_huff_offset; 
00088     uint8_t     codebook;         
00089     uint8_t     huff_lsbs;        
00090 } ChannelParams;
00091 
00097 extern const uint8_t ff_mlp_huffman_tables[3][18][2];
00098 
00104 uint8_t  ff_mlp_checksum8 (const uint8_t *buf, unsigned int buf_size);
00105 uint16_t ff_mlp_checksum16(const uint8_t *buf, unsigned int buf_size);
00106 
00110 uint8_t ff_mlp_restart_checksum(const uint8_t *buf, unsigned int bit_size);
00111 
00115 uint8_t ff_mlp_calculate_parity(const uint8_t *buf, unsigned int buf_size);
00116 
00117 void ff_mlp_init_crc(void);
00118 
00120 static inline uint8_t xor_32_to_8(uint32_t value)
00121 {
00122     value ^= value >> 16;
00123     value ^= value >>  8;
00124     return value;
00125 }
00126 
00127 #endif /* AVCODEC_MLP_H */

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