adpcm.c File Reference

Include dependency graph for adpcm.c:


Data Structures

struct  decoder_sys_t
struct  adpcm_ms_channel_s
struct  adpcm_ima_wav_channel_s

Defines

#define CLAMP(v, min, max)
#define GetByte(v)   (v) = *p_buffer; p_buffer++;
#define GetWord(v)
#define MAX_CHAN   5

Typedefs

typedef struct adpcm_ms_channel_s adpcm_ms_channel_t
typedef struct
adpcm_ima_wav_channel_s 		adpcm_ima_wav_channel_t

Enumerations

enum  adpcm_codec_e {
  ADPCM_IMA_QT, ADPCM_IMA_WAV, ADPCM_MS, ADPCM_DK3,
  ADPCM_DK4, ADPCM_EA
}

Functions

static int OpenDecoder (vlc_object_t *)
static void CloseDecoder (vlc_object_t *)
static aout_buffer_t * DecodeBlock (decoder_t *, block_t **)
int vlc_entry__main (module_t *p_module)
const char * vlc_entry_license__main (void)
static void DecodeAdpcmMs (decoder_t *, int16_t *, uint8_t *)
static void DecodeAdpcmImaWav (decoder_t *, int16_t *, uint8_t *)
static void DecodeAdpcmImaQT (decoder_t *, int16_t *, uint8_t *)
static void DecodeAdpcmDk4 (decoder_t *, int16_t *, uint8_t *)
static void DecodeAdpcmDk3 (decoder_t *, int16_t *, uint8_t *)
static void DecodeAdpcmEA (decoder_t *, int16_t *, uint8_t *)
static int AdpcmMsExpandNibble (adpcm_ms_channel_t *p_channel, int i_nibble)
static int AdpcmImaWavExpandNibble (adpcm_ima_wav_channel_t *p_channel, int i_nibble)

Variables

static const int pi_channels_maps [6]
static const int i_index_table [16]
static const int i_step_table [89]
static const int i_adaptation_table [16]
static const int i_adaptation_coeff1 [7]
static const int i_adaptation_coeff2 [7]

Define Documentation

#define CLAMP ( v,
min,
max   ) 

Value:

if( (v) < (min) ) (v) = (min); \
    if( (v) > (max) ) (v) = (max)

Referenced by AdpcmImaWavExpandNibble(), AdpcmMsExpandNibble(), DecodeAdpcmDk4(), DecodeAdpcmEA(), DecodeAdpcmImaQT(), DecodeAdpcmImaWav(), DecodeAdpcmMs(), and yuv_to_rgb().

#define GetByte ( v   )     (v) = *p_buffer; p_buffer++;

Referenced by DecodeAdpcmDk3(), DecodeAdpcmDk4(), DecodeAdpcmImaWav(), and DecodeAdpcmMs().

#define GetWord ( v   ) 

Value:

(v) = *p_buffer; p_buffer++; \
    (v) |= ( *p_buffer ) << 8; p_buffer++; \
    if( (v)&0x8000 ) (v) -= 0x010000;

Referenced by DecodeAdpcmDk3(), DecodeAdpcmDk4(), DecodeAdpcmImaWav(), and DecodeAdpcmMs().

#define MAX_CHAN   5

Referenced by DecodeAdpcmEA().

Typedef Documentation

typedef struct adpcm_ima_wav_channel_s adpcm_ima_wav_channel_t

typedef struct adpcm_ms_channel_s adpcm_ms_channel_t

Enumeration Type Documentation

enum adpcm_codec_e

Enumerator:
ADPCM_IMA_QT 
ADPCM_IMA_WAV 
ADPCM_MS 
ADPCM_DK3 
ADPCM_DK4 
ADPCM_EA 

Function Documentation

static int AdpcmImaWavExpandNibble ( adpcm_ima_wav_channel_t *  p_channel,
int  i_nibble 
) [static]

References CLAMP, i_index_table, adpcm_ima_wav_channel_s::i_predictor, adpcm_ima_wav_channel_s::i_step_index, and i_step_table.

Referenced by DecodeAdpcmDk3(), DecodeAdpcmDk4(), DecodeAdpcmImaQT(), and DecodeAdpcmImaWav().

static int AdpcmMsExpandNibble ( adpcm_ms_channel_t *  p_channel,
int  i_nibble 
) [static]

References CLAMP, i_adaptation_table, adpcm_ms_channel_s::i_coeff1, adpcm_ms_channel_s::i_coeff2, adpcm_ms_channel_s::i_idelta, adpcm_ms_channel_s::i_sample1, and adpcm_ms_channel_s::i_sample2.

Referenced by DecodeAdpcmMs().

static void CloseDecoder ( vlc_object_t *  p_this  )  [static]

References ADPCM_EA, decoder_sys_t::codec, decoder_t::fmt_in, es_format_t::p_extra, decoder_t::p_sys, and p_sys.

static void DecodeAdpcmDk3 ( decoder_t *  p_dec,
int16_t *  p_sample,
uint8_t *  p_buffer 
) [static]

References AdpcmImaWavExpandNibble(), GetByte, GetWord, decoder_sys_t::i_block, adpcm_ima_wav_channel_s::i_predictor, adpcm_ima_wav_channel_s::i_step_index, decoder_t::p_sys, and p_sys.

Referenced by DecodeBlock().

static void DecodeAdpcmDk4 ( decoder_t *  p_dec,
int16_t *  p_sample,
uint8_t *  p_buffer 
) [static]

References AdpcmImaWavExpandNibble(), es_format_t::audio, CLAMP, decoder_t::fmt_in, GetByte, GetWord, decoder_sys_t::i_block, audio_format_t::i_channels, adpcm_ima_wav_channel_s::i_predictor, decoder_t::p_sys, and p_sys.

Referenced by DecodeBlock().

static void DecodeAdpcmEA ( decoder_t *  p_dec,
int16_t *  p_sample,
uint8_t *  p_buffer 
) [static]

References es_format_t::audio, c, CLAMP, decoder_t::fmt_in, decoder_sys_t::i_block, audio_format_t::i_channels, MAX_CHAN, es_format_t::p_extra, decoder_t::p_sys, and p_sys.

Referenced by DecodeBlock().

static void DecodeAdpcmImaQT ( decoder_t *  p_dec,
int16_t *  p_sample,
uint8_t *  p_buffer 
) [static]

References AdpcmImaWavExpandNibble(), es_format_t::audio, CLAMP, decoder_t::fmt_in, audio_format_t::i_channels, adpcm_ima_wav_channel_s::i_predictor, and adpcm_ima_wav_channel_s::i_step_index.

Referenced by DecodeBlock().

static void DecodeAdpcmImaWav ( decoder_t *  p_dec,
int16_t *  p_sample,
uint8_t *  p_buffer 
) [static]

References AdpcmImaWavExpandNibble(), es_format_t::audio, CLAMP, decoder_t::fmt_in, GetByte, GetWord, i, decoder_sys_t::i_block, audio_format_t::i_channels, decoder_t::p_sys, and p_sys.

Referenced by DecodeBlock().

static void DecodeAdpcmMs ( decoder_t *  p_dec,
int16_t *  p_sample,
uint8_t *  p_buffer 
) [static]

References AdpcmMsExpandNibble(), es_format_t::audio, CLAMP, decoder_t::fmt_in, GetByte, GetWord, i_adaptation_coeff1, i_adaptation_coeff2, decoder_sys_t::i_block, audio_format_t::i_channels, adpcm_ms_channel_s::i_coeff1, adpcm_ms_channel_s::i_coeff2, adpcm_ms_channel_s::i_sample1, adpcm_ms_channel_s::i_sample2, decoder_t::p_sys, and p_sys.

Referenced by DecodeBlock().

static aout_buffer_t * DecodeBlock ( decoder_t *  p_dec,
block_t **  pp_block 
) [static]

References ADPCM_DK3, ADPCM_DK4, ADPCM_EA, ADPCM_IMA_QT, ADPCM_IMA_WAV, ADPCM_MS, block_Release(), decoder_sys_t::codec, date_Get(), date_Increment(), date_Set(), DecodeAdpcmDk3(), DecodeAdpcmDk4(), DecodeAdpcmEA(), DecodeAdpcmImaQT(), DecodeAdpcmImaWav(), DecodeAdpcmMs(), decoder_NewAudioBuffer(), decoder_sys_t::end_date, decoder_sys_t::i_block, block_t::i_buffer, block_t::i_length, block_t::i_pts, decoder_sys_t::i_samplesperblock, block_t::p_buffer, decoder_t::p_sys, p_sys, and VLC_TS_INVALID.

static int OpenDecoder ( vlc_object_t *  p_this  )  [static]

References ADPCM_DK3, ADPCM_DK4, ADPCM_EA, ADPCM_IMA_QT, ADPCM_IMA_WAV, ADPCM_MS, es_format_t::audio, AUDIO_ES, decoder_sys_t::codec, date_Init(), date_Set(), DecodeBlock(), decoder_sys_t::end_date, decoder_t::fmt_in, decoder_t::fmt_out, audio_format_t::i_bitspersample, decoder_sys_t::i_block, audio_format_t::i_blockalign, es_format_t::i_cat, audio_format_t::i_channels, es_format_t::i_codec, audio_format_t::i_original_channels, audio_format_t::i_physical_channels, audio_format_t::i_rate, decoder_sys_t::i_samplesperblock, msg_Dbg, msg_Err, msg_Warn, es_format_t::p_extra, decoder_t::p_sys, p_sys, decoder_t::pf_decode_audio, pi_channels_maps, VLC_CODEC_ADPCM_IMA_WAV, VLC_CODEC_ADPCM_MS, VLC_CODEC_S16N, VLC_EGENERIC, VLC_ENOMEM, VLC_FOURCC, and VLC_SUCCESS.

int vlc_entry__main ( module_t *  p_module  ) 

const char* vlc_entry_license__main ( void   ) 

Variable Documentation

const int i_adaptation_coeff1[7] [static]

Initial value:

{
    256, 512, 0, 192, 240, 460, 392
}

Referenced by DecodeAdpcmMs().

const int i_adaptation_coeff2[7] [static]

Initial value:

{
    0, -256, 0, 64, 0, -208, -232
}

Referenced by DecodeAdpcmMs().

const int i_adaptation_table[16] [static]

Initial value:

{
    230, 230, 230, 230, 307, 409, 512, 614,
    768, 614, 512, 409, 307, 230, 230, 230
}

Referenced by AdpcmMsExpandNibble().

const int i_index_table[16] [static]

Initial value:

{
    -1, -1, -1, -1, 2, 4, 6, 8,
    -1, -1, -1, -1, 2, 4, 6, 8
}

Referenced by AdpcmImaWavExpandNibble().

const int i_step_table[89] [static]

Initial value:

{
    7, 8, 9, 10, 11, 12, 13, 14, 16, 17,
    19, 21, 23, 25, 28, 31, 34, 37, 41, 45,
    50, 55, 60, 66, 73, 80, 88, 97, 107, 118,
    130, 143, 157, 173, 190, 209, 230, 253, 279, 307,
    337, 371, 408, 449, 494, 544, 598, 658, 724, 796,
    876, 963, 1060, 1166, 1282, 1411, 1552, 1707, 1878, 2066,
    2272, 2499, 2749, 3024, 3327, 3660, 4026, 4428, 4871, 5358,
    5894, 6484, 7132, 7845, 8630, 9493, 10442, 11487, 12635, 13899,
    15289, 16818, 18500, 20350, 22385, 24623, 27086, 29794, 32767
}

Referenced by AdpcmImaWavExpandNibble().

const int pi_channels_maps[6] [static]

Initial value:

{
    0,
     0x1 ,
     0x2  |  0x4 ,
     0x2  |  0x4  |  0x1 ,
     0x2  |  0x4  |  0x20  |  0x20 ,
     0x2  |  0x4  |  0x1 
     |  0x20  |  0x20 
}

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