libavcodec/nellymoserdec.c File Reference

The 3 alphanumeric copyright notices are md5summed they are from the original implementors. More...

#include "avcodec.h"
#include "random.h"
#include "dsputil.h"
#include "bitstream.h"

Go to the source code of this file.

Data Structures

struct  NellyMoserDecodeContext

Defines

#define ALT_BITSTREAM_READER_LE
#define NELLY_BANDS   23
#define NELLY_BLOCK_LEN   64
#define NELLY_HEADER_BITS   116
#define NELLY_DETAIL_BITS   198
#define NELLY_BUF_LEN   128
#define NELLY_FILL_LEN   124
#define NELLY_BIT_CAP   6
#define NELLY_BASE_OFF   4228
#define NELLY_BASE_SHIFT   19
#define NELLY_SAMPLES   (2 * NELLY_BUF_LEN)

Functions

static DECLARE_ALIGNED_16 (float, sine_window[128])
static int signed_shift (int i, int shift)
static void overlap_and_window (NellyMoserDecodeContext *s, float *state, float *audio)
static int sum_bits (short *buf, short shift, short off)
static int headroom (int *la)
static void get_sample_bits (const float *buf, int *bits)
void nelly_decode_block (NellyMoserDecodeContext *s, const unsigned char block[NELLY_BLOCK_LEN], float audio[NELLY_SAMPLES])
static int decode_init (AVCodecContext *avctx)
static int decode_tag (AVCodecContext *avctx, void *data, int *data_size, const uint8_t *buf, int buf_size)
static int decode_end (AVCodecContext *avctx)

Variables

static const float dequantization_table [127]
static const uint8_t nelly_band_sizes_table [NELLY_BANDS]
static const uint16_t nelly_init_table [64]
static const int16_t nelly_delta_table [32]
AVCodec nellymoser_decoder


Detailed Description

The 3 alphanumeric copyright notices are md5summed they are from the original implementors.

The original code is available from http://code.google.com/p/nelly2pcm/

Definition in file nellymoserdec.c.


Define Documentation

#define ALT_BITSTREAM_READER_LE

Definition at line 37 of file nellymoserdec.c.

#define NELLY_BANDS   23

Definition at line 40 of file nellymoserdec.c.

Referenced by nelly_decode_block().

#define NELLY_BASE_OFF   4228

Definition at line 47 of file nellymoserdec.c.

Referenced by get_sample_bits().

#define NELLY_BASE_SHIFT   19

Definition at line 48 of file nellymoserdec.c.

Referenced by get_sample_bits().

#define NELLY_BIT_CAP   6

Definition at line 46 of file nellymoserdec.c.

Referenced by get_sample_bits(), and sum_bits().

#define NELLY_BLOCK_LEN   64

Definition at line 41 of file nellymoserdec.c.

Referenced by decode_tag().

#define NELLY_BUF_LEN   128

Definition at line 44 of file nellymoserdec.c.

Referenced by nelly_decode_block(), and overlap_and_window().

#define NELLY_DETAIL_BITS   198

Definition at line 43 of file nellymoserdec.c.

Referenced by get_sample_bits(), and nelly_decode_block().

#define NELLY_FILL_LEN   124

Definition at line 45 of file nellymoserdec.c.

Referenced by get_sample_bits(), nelly_decode_block(), and sum_bits().

#define NELLY_HEADER_BITS   116

Definition at line 42 of file nellymoserdec.c.

Referenced by nelly_decode_block().

#define NELLY_SAMPLES   (2 * NELLY_BUF_LEN)

Definition at line 49 of file nellymoserdec.c.

Referenced by decode_tag().


Function Documentation

static DECLARE_ALIGNED_16 ( float  ,
sine_window  [128] 
) [static]

static int decode_end ( AVCodecContext avctx  )  [static]

Definition at line 394 of file nellymoserdec.c.

static int decode_init ( AVCodecContext avctx  )  [static]

Definition at line 332 of file nellymoserdec.c.

static int decode_tag ( AVCodecContext avctx,
void *  data,
int *  data_size,
const uint8_t buf,
int  buf_size 
) [static]

Definition at line 359 of file nellymoserdec.c.

static void get_sample_bits ( const float *  buf,
int *  bits 
) [static]

Definition at line 167 of file nellymoserdec.c.

Referenced by nelly_decode_block().

static int headroom ( int *  la  )  [static]

Definition at line 155 of file nellymoserdec.c.

Referenced by get_sample_bits().

void nelly_decode_block ( NellyMoserDecodeContext s,
const unsigned char  block[NELLY_BLOCK_LEN],
float  audio[NELLY_SAMPLES] 
)

Definition at line 277 of file nellymoserdec.c.

Referenced by decode_tag().

static void overlap_and_window ( NellyMoserDecodeContext s,
float *  state,
float *  audio 
) [static]

Definition at line 114 of file nellymoserdec.c.

Referenced by nelly_decode_block().

static int signed_shift ( int  i,
int  shift 
) [inline, static]

Definition at line 108 of file nellymoserdec.c.

Referenced by get_sample_bits().

static int sum_bits ( short *  buf,
short  shift,
short  off 
) [static]

Definition at line 142 of file nellymoserdec.c.

Referenced by get_sample_bits().


Variable Documentation

const float dequantization_table[127] [static]

Initial value:

 {
0.0000000000,-0.8472560048, 0.7224709988, -1.5247479677, -0.4531480074, 0.3753609955, 1.4717899561,
-1.9822579622, -1.1929379702, -0.5829370022, -0.0693780035, 0.3909569979,0.9069200158, 1.4862740040,
 2.2215409279, -2.3887870312, -1.8067539930, -1.4105420113, -1.0773609877, -0.7995010018,-0.5558109879,
-0.3334020078, -0.1324490011, 0.0568020009, 0.2548770010, 0.4773550034, 0.7386850119, 1.0443060398,
1.3954459429, 1.8098750114, 2.3918759823,-2.3893830776, -1.9884680510, -1.7514040470, -1.5643119812,
-1.3922129869,-1.2164649963, -1.0469499826, -0.8905100226, -0.7645580173, -0.6454579830, -0.5259280205,
-0.4059549868, -0.3029719889, -0.2096900046, -0.1239869967, -0.0479229987, 0.0257730000, 0.1001340002,
0.1737180054, 0.2585540116, 0.3522900045, 0.4569880068, 0.5767750144, 0.7003160119, 0.8425520062,
1.0093879700, 1.1821349859, 1.3534560204, 1.5320819616, 1.7332619429, 1.9722349644, 2.3978140354,
-2.5756309032, -2.0573320389, -1.8984919786, -1.7727810144, -1.6662600040, -1.5742180347, -1.4993319511,
-1.4316639900, -1.3652280569, -1.3000990152, -1.2280930281, -1.1588579416, -1.0921250582, -1.0135740042,
-0.9202849865, -0.8287050128, -0.7374889851, -0.6447759867, -0.5590940118, -0.4857139885, -0.4110319912,
-0.3459700048, -0.2851159871, -0.2341620028, -0.1870580018, -0.1442500055, -0.1107169986, -0.0739680007,
-0.0365610011, -0.0073290002, 0.0203610007, 0.0479039997, 0.0751969963, 0.0980999991, 0.1220389977,
0.1458999962, 0.1694349945, 0.1970459968, 0.2252430022, 0.2556869984, 0.2870100141, 0.3197099864,
0.3525829911, 0.3889069855, 0.4334920049, 0.4769459963, 0.5204820037, 0.5644530058, 0.6122040153,
0.6685929894, 0.7341650128, 0.8032159805, 0.8784040213, 0.9566209912, 1.0397069454, 1.1293770075,
1.2211159468, 1.3080279827, 1.4024800062, 1.5056819916, 1.6227730513, 1.7724959850, 1.9430880547,
 2.2903931141
}

Definition at line 51 of file nellymoserdec.c.

Referenced by nelly_decode_block().

const uint8_t nelly_band_sizes_table[NELLY_BANDS] [static]

Initial value:

 {
2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 4, 4, 5, 6, 6, 7, 8, 9, 10, 12, 14, 15
}

Definition at line 73 of file nellymoserdec.c.

Referenced by nelly_decode_block().

const int16_t nelly_delta_table[32] [static]

Initial value:

 {
-11725, -9420, -7910, -6801, -5948, -5233, -4599, -4039, -3507, -3030, -2596,
-2170, -1774, -1383, -1016, -660, -329, -1, 337, 696, 1085, 1512, 1962, 2433,
2968, 3569, 4314, 5279, 6622, 8154, 10076, 12975
}

Definition at line 86 of file nellymoserdec.c.

Referenced by nelly_decode_block().

const uint16_t nelly_init_table[64] [static]

Initial value:

 {
3134, 5342, 6870, 7792, 8569, 9185, 9744, 10191, 10631, 11061, 11434, 11770,
12116, 12513, 12925, 13300, 13674, 14027, 14352, 14716, 15117, 15477, 15824,
16157, 16513, 16804, 17090, 17401, 17679, 17948, 18238, 18520, 18764, 19078,
19381, 19640, 19921, 20205, 20500, 20813, 21162, 21465, 21794, 22137, 22453,
22756, 23067, 23350, 23636, 23926, 24227, 24521, 24819, 25107, 25414, 25730,
26120, 26497, 26895, 27344, 27877, 28463, 29426, 31355
}

Definition at line 77 of file nellymoserdec.c.

Referenced by nelly_decode_block().

Initial value:

Definition at line 401 of file nellymoserdec.c.


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