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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 6
00032
00033 #define AC3_MAX_COEFS 256
00034 #define AC3_BLOCK_SIZE 256
00035 #define AC3_MAX_BLOCKS 6
00036 #define AC3_FRAME_SIZE (AC3_MAX_BLOCKS * 256)
00037 #define AC3_WINDOW_SIZE (AC3_BLOCK_SIZE * 2)
00038 #define AC3_CRITICAL_BANDS 50
00039 #define AC3_MAX_CPL_BANDS 18
00040
00041 #include "ac3tab.h"
00042
00043
00044 #define EXP_REUSE 0
00045 #define EXP_NEW 1
00046
00047 #define EXP_D15 1
00048 #define EXP_D25 2
00049 #define EXP_D45 3
00050
00052 typedef enum {
00053 DBA_REUSE = 0,
00054 DBA_NEW,
00055 DBA_NONE,
00056 DBA_RESERVED
00057 } AC3DeltaStrategy;
00058
00060 typedef enum {
00061 AC3_CHMODE_DUALMONO = 0,
00062 AC3_CHMODE_MONO,
00063 AC3_CHMODE_STEREO,
00064 AC3_CHMODE_3F,
00065 AC3_CHMODE_2F1R,
00066 AC3_CHMODE_3F1R,
00067 AC3_CHMODE_2F2R,
00068 AC3_CHMODE_3F2R
00069 } AC3ChannelMode;
00070
00071 typedef struct AC3BitAllocParameters {
00072 int sr_code;
00073 int sr_shift;
00074 int slow_gain, slow_decay, fast_decay, db_per_bit, floor;
00075 int cpl_fast_leak, cpl_slow_leak;
00076 } AC3BitAllocParameters;
00077
00082 typedef struct {
00086 uint16_t sync_word;
00087 uint16_t crc1;
00088 uint8_t sr_code;
00089 uint8_t bitstream_id;
00090 uint8_t channel_mode;
00091 uint8_t lfe_on;
00092 uint8_t frame_type;
00093 int substreamid;
00094 int center_mix_level;
00095 int surround_mix_level;
00096 uint16_t channel_map;
00097 int num_blocks;
00098
00103 uint8_t sr_shift;
00104 uint16_t sample_rate;
00105 uint32_t bit_rate;
00106 uint8_t channels;
00107 uint16_t frame_size;
00108 int64_t channel_layout;
00110 } AC3HeaderInfo;
00111
00112 typedef enum {
00113 EAC3_FRAME_TYPE_INDEPENDENT = 0,
00114 EAC3_FRAME_TYPE_DEPENDENT,
00115 EAC3_FRAME_TYPE_AC3_CONVERT,
00116 EAC3_FRAME_TYPE_RESERVED
00117 } EAC3FrameType;
00118
00119 void ff_ac3_common_init(void);
00120
00135 void ff_ac3_bit_alloc_calc_psd(int8_t *exp, int start, int end, int16_t *psd,
00136 int16_t *band_psd);
00137
00160 int ff_ac3_bit_alloc_calc_mask(AC3BitAllocParameters *s, int16_t *band_psd,
00161 int start, int end, int fast_gain, int is_lfe,
00162 int dba_mode, int dba_nsegs, uint8_t *dba_offsets,
00163 uint8_t *dba_lengths, uint8_t *dba_values,
00164 int16_t *mask);
00165
00181 void ff_ac3_bit_alloc_calc_bap(int16_t *mask, int16_t *psd, int start, int end,
00182 int snr_offset, int floor,
00183 const uint8_t *bap_tab, uint8_t *bap);
00184
00185 #endif