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00027 #ifndef AVCODEC_AC3_H
00028 #define AVCODEC_AC3_H
00029
00030 #define AC3_MAX_CODED_FRAME_SIZE 3840
00031 #define AC3_MAX_CHANNELS 7
00032 #define CPL_CH 0
00034 #define AC3_MAX_COEFS 256
00035 #define AC3_BLOCK_SIZE 256
00036 #define AC3_MAX_BLOCKS 6
00037 #define AC3_FRAME_SIZE (AC3_MAX_BLOCKS * 256)
00038 #define AC3_WINDOW_SIZE (AC3_BLOCK_SIZE * 2)
00039 #define AC3_CRITICAL_BANDS 50
00040 #define AC3_MAX_CPL_BANDS 18
00041
00042 #include "ac3tab.h"
00043
00044
00045 #define EXP_REUSE 0
00046 #define EXP_NEW 1
00047
00048 #define EXP_D15 1
00049 #define EXP_D25 2
00050 #define EXP_D45 3
00051
00052
00053 #define LEVEL_PLUS_3DB 1.4142135623730950
00054 #define LEVEL_PLUS_1POINT5DB 1.1892071150027209
00055 #define LEVEL_MINUS_1POINT5DB 0.8408964152537145
00056 #define LEVEL_MINUS_3DB 0.7071067811865476
00057 #define LEVEL_MINUS_4POINT5DB 0.5946035575013605
00058 #define LEVEL_MINUS_6DB 0.5000000000000000
00059 #define LEVEL_MINUS_9DB 0.3535533905932738
00060 #define LEVEL_ZERO 0.0000000000000000
00061 #define LEVEL_ONE 1.0000000000000000
00062
00064 typedef enum {
00065 DBA_REUSE = 0,
00066 DBA_NEW,
00067 DBA_NONE,
00068 DBA_RESERVED
00069 } AC3DeltaStrategy;
00070
00072 typedef enum {
00073 AC3_CHMODE_DUALMONO = 0,
00074 AC3_CHMODE_MONO,
00075 AC3_CHMODE_STEREO,
00076 AC3_CHMODE_3F,
00077 AC3_CHMODE_2F1R,
00078 AC3_CHMODE_3F1R,
00079 AC3_CHMODE_2F2R,
00080 AC3_CHMODE_3F2R
00081 } AC3ChannelMode;
00082
00083 typedef struct AC3BitAllocParameters {
00084 int sr_code;
00085 int sr_shift;
00086 int slow_gain, slow_decay, fast_decay, db_per_bit, floor;
00087 int cpl_fast_leak, cpl_slow_leak;
00088 } AC3BitAllocParameters;
00089
00094 typedef struct {
00098 uint16_t sync_word;
00099 uint16_t crc1;
00100 uint8_t sr_code;
00101 uint8_t bitstream_id;
00102 uint8_t bitstream_mode;
00103 uint8_t channel_mode;
00104 uint8_t lfe_on;
00105 uint8_t frame_type;
00106 int substreamid;
00107 int center_mix_level;
00108 int surround_mix_level;
00109 uint16_t channel_map;
00110 int num_blocks;
00111
00116 uint8_t sr_shift;
00117 uint16_t sample_rate;
00118 uint32_t bit_rate;
00119 uint8_t channels;
00120 uint16_t frame_size;
00121 uint64_t channel_layout;
00123 } AC3HeaderInfo;
00124
00125 typedef enum {
00126 EAC3_FRAME_TYPE_INDEPENDENT = 0,
00127 EAC3_FRAME_TYPE_DEPENDENT,
00128 EAC3_FRAME_TYPE_AC3_CONVERT,
00129 EAC3_FRAME_TYPE_RESERVED
00130 } EAC3FrameType;
00131
00132 void ff_ac3_common_init(void);
00133
00148 void ff_ac3_bit_alloc_calc_psd(int8_t *exp, int start, int end, int16_t *psd,
00149 int16_t *band_psd);
00150
00173 int ff_ac3_bit_alloc_calc_mask(AC3BitAllocParameters *s, int16_t *band_psd,
00174 int start, int end, int fast_gain, int is_lfe,
00175 int dba_mode, int dba_nsegs, uint8_t *dba_offsets,
00176 uint8_t *dba_lengths, uint8_t *dba_values,
00177 int16_t *mask);
00178
00179 #endif