rockbox/apps/codecs/libatrac/atrac3.h

#include "ffmpeg_bitstream.h"
#include "../librm/rm.h"

/* These structures are needed to store the parsed gain control data. */
typedef struct {
    int   num_gain_data;
    int   levcode[8];
    int   loccode[8];
} gain_info;

typedef struct {
    gain_info   gBlock[4];
} gain_block;

typedef struct {
    int     pos;
    int     numCoefs;
    int32_t coef[8];
} tonal_component;

typedef struct {
    int               bandsCoded;
    int               numComponents;
    tonal_component   components[64];
    int32_t           prevFrame[1024];
    int               gcBlkSwitch;
    gain_block        gainBlock[2];

    int32_t           spectrum[1024] __attribute__((aligned(16)));
    int32_t           IMDCT_buf[1024] __attribute__((aligned(16)));

    int32_t           delayBuf1[46]; ///<qmf delay buffers
    int32_t           delayBuf2[46];
    int32_t           delayBuf3[46];
} channel_unit;

typedef struct {
    GetBitContext       gb;
    //@{
    /** stream data */
    int                 channels;
    int                 codingMode;
    int                 bit_rate;
    int                 sample_rate;
    int                 samples_per_channel;
    int                 samples_per_frame;

    int                 bits_per_frame;
    int                 bytes_per_frame;
    int                 pBs;
    channel_unit*       pUnits;
    //@}
    //@{
    /** joint-stereo related variables */
    int                 matrix_coeff_index_prev[4];
    int                 matrix_coeff_index_now[4];
    int                 matrix_coeff_index_next[4];
    int                 weighting_delay[6];
    //@}
    //@{
    /** data buffers */
    int32_t             outSamples[2048];
    uint8_t             decoded_bytes_buffer[1024];
    int32_t             tempBuf[1070];
    //@}
    //@{
    /** extradata */
    int                 atrac3version;
    int                 delay;
    int                 scrambled_stream;
    int                 frame_factor;
    //@}
} ATRAC3Context;

int atrac3_decode_init(ATRAC3Context *q, RMContext *rmctx);

int atrac3_decode_frame(RMContext *rmctx, ATRAC3Context *q,
                        void *data, int *data_size, 
                        const uint8_t *buf, int buf_size);