mp3_utils.cpp File Reference

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Typedefs
typedef t_uint16	uint16

Functions
static t_uint32	CRC_update (unsigned value, t_uint32 crc)
static unsigned	extract_header_bits (const t_uint8 p_header[4], unsigned p_base, unsigned p_bits)
static t_uint16	grabFrameCRC (const t_uint8 *frameData, t_size sideInfoLen)

Variables
static const uint16	bitrate_table_l1v1 [16] = { 0, 32, 64, 96,128,160,192,224,256,288,320,352,384,416,448, 0}
static const uint16	bitrate_table_l1v2 [16] = { 0, 32, 48, 56, 64, 80, 96,112,128,144,160,176,192,224,256, 0}
static const uint16	bitrate_table_l23v2 [16] = { 0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96,112,128,144,160, 0}
static const uint16	bitrate_table_l2v1 [16] = { 0, 32, 48, 56, 64, 80, 96,112,128,160,192,224,256,320,384, 0}
static const uint16	bitrate_table_l3v1 [16] = { 0, 32, 40, 48, 56, 64, 80, 96,112,128,160,192,224,256,320, 0}
static const uint16	sample_rate_table [] = {11025,12000,8000}

Typedef Documentation

typedef t_uint16 uint16

Definition at line 32 of file mp3_utils.cpp.

Function Documentation

static t_uint32 CRC_update ( unsigned  value, t_uint32  crc  )

static

Definition at line 199 of file mp3_utils.cpp.

{
    enum { CRC16_POLYNOMIAL = 0x8005 };
    unsigned i;
    value <<= 8;
    for (i = 0; i < 8; i++) {
        value <<= 1;
        crc <<= 1;
        if (((crc ^ value) & 0x10000)) crc ^= CRC16_POLYNOMIAL;
    }
    return crc;
}

static unsigned extract_header_bits ( const t_uint8  p_header[4], unsigned  p_base, unsigned  p_bits  )

static

Definition at line 5 of file mp3_utils.cpp.

{
    assert(p_base+p_bits<=32);
    return (unsigned) extract_bits(p_header,p_base,p_bits);
}

static t_uint16 grabFrameCRC ( const t_uint8 *  frameData, t_size  sideInfoLen  )

static

Definition at line 221 of file mp3_utils.cpp.

                                                                            {
    t_uint32 crc = 0xffff;
    crc = CRC_update(frameData[2], crc);
    crc = CRC_update(frameData[3], crc);
    for (t_size i = 6; i < sideInfoLen; i++) {
        crc = CRC_update(frameData[i], crc);
    }

    return (t_uint32) (crc & 0xFFFF);
}

Variable Documentation

const uint16 bitrate_table_l1v1[16] = { 0, 32, 64, 96,128,160,192,224,256,288,320,352,384,416,448, 0}

static

Definition at line 34 of file mp3_utils.cpp.

const uint16 bitrate_table_l1v2[16] = { 0, 32, 48, 56, 64, 80, 96,112,128,144,160,176,192,224,256, 0}

static

Definition at line 37 of file mp3_utils.cpp.

const uint16 bitrate_table_l23v2[16] = { 0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96,112,128,144,160, 0}

static

Definition at line 38 of file mp3_utils.cpp.

const uint16 bitrate_table_l2v1[16] = { 0, 32, 48, 56, 64, 80, 96,112,128,160,192,224,256,320,384, 0}

static

Definition at line 35 of file mp3_utils.cpp.

const uint16 bitrate_table_l3v1[16] = { 0, 32, 40, 48, 56, 64, 80, 96,112,128,160,192,224,256,320, 0}

static

Definition at line 36 of file mp3_utils.cpp.

const uint16 sample_rate_table[] = {11025,12000,8000}

static

Definition at line 39 of file mp3_utils.cpp.