wav64_internal.h

#ifndef __LIBDRAGON_WAV64_INTERNAL_H
#define __LIBDRAGON_WAV64_INTERNAL_H
 
#define WAV64_ID            "WV64"
#define WAV64_FILE_VERSION  2
#define WAV64_FORMAT_RAW    0
#define WAV64_FORMAT_VADPCM 1
#define WAV64_FORMAT_OPUS   3
#define WAV64_NUM_FORMATS   4
 
typedef struct wav64_s wav64_t;
typedef struct samplebuffer_s samplebuffer_t;
 
typedef struct __attribute__((packed)) {
    char id[4];             
    int8_t version;         
    int8_t format;          
    int8_t channels;        
    int8_t nbits;           
    int32_t freq;           
    int32_t len;            
    int32_t loop_len;       
    int32_t start_offset;   
} wav64_header_t;
 
_Static_assert(sizeof(wav64_header_t) == 24, "invalid wav64_header size");
 
typedef struct __attribute__((aligned(8))) {
    int16_t v[8];                       
} wav64_vadpcm_vector_t;
 
typedef struct __attribute__((packed, aligned(8))) {
    int8_t npredictors;                 
    int8_t order;                       
    uint16_t padding;                   
    uint32_t padding1;                  
    wav64_vadpcm_vector_t loop_state[2];
    wav64_vadpcm_vector_t state[2];     
    wav64_vadpcm_vector_t codebook[];   
} wav64_header_vadpcm_t;
 
typedef struct {
    void (*init)(wav64_t *wav);
    void (*close)(wav64_t *wav);
    int (*get_bitrate)(wav64_t *wav);
} wav64_compression_t;
 
void raw_waveform_read(samplebuffer_t *sbuf, int fd, int wpos, int wlen, int bps);
 
void raw_waveform_read_address(samplebuffer_t *sbuf, int rom_addr, int wpos, int wlen, int bps);
#endif