FFmpeg
Data Structures | Macros | Functions | Variables
imc.c File Reference

IMC - Intel Music Coder A mdct based codec using a 256 points large transform divided into 32 bands with some mix of scale factors. More...

#include <math.h>
#include <stddef.h>
#include <stdio.h>
#include "libavutil/channel_layout.h"
#include "libavutil/ffmath.h"
#include "libavutil/float_dsp.h"
#include "libavutil/internal.h"
#include "libavutil/mem_internal.h"
#include "libavutil/thread.h"
#include "avcodec.h"
#include "bswapdsp.h"
#include "get_bits.h"
#include "fft.h"
#include "internal.h"
#include "sinewin.h"
#include "imcdata.h"

Go to the source code of this file.

Data Structures

struct  IMCChannel
 
struct  IMCContext
 

Macros

#define IMC_BLOCK_SIZE   64
 
#define IMC_FRAME_ID   0x21
 
#define BANDS   32
 
#define COEFFS   256
 
#define IMC_VLC_BITS   9
 
#define VLC_TABLES_SIZE   9512
 

Functions

static double freq2bark (double freq)
 
static av_cold void iac_generate_tabs (IMCContext *q, int sampling_rate)
 
static av_cold void imc_init_static (void)
 
static av_cold int imc_decode_init (AVCodecContext *avctx)
 
static void imc_calculate_coeffs (IMCContext *q, float *flcoeffs1, float *flcoeffs2, int *bandWidthT, float *flcoeffs3, float *flcoeffs5)
 
static void imc_read_level_coeffs (IMCContext *q, int stream_format_code, int *levlCoeffs)
 
static void imc_read_level_coeffs_raw (IMCContext *q, int stream_format_code, int *levlCoeffs)
 
static void imc_decode_level_coefficients (IMCContext *q, int *levlCoeffBuf, float *flcoeffs1, float *flcoeffs2)
 
static void imc_decode_level_coefficients2 (IMCContext *q, int *levlCoeffBuf, float *old_floor, float *flcoeffs1, float *flcoeffs2)
 
static void imc_decode_level_coefficients_raw (IMCContext *q, int *levlCoeffBuf, float *flcoeffs1, float *flcoeffs2)
 
static int bit_allocation (IMCContext *q, IMCChannel *chctx, int stream_format_code, int freebits, int flag)
 Perform bit allocation depending on bits available. More...
 
static void imc_get_skip_coeff (IMCContext *q, IMCChannel *chctx)
 
static void imc_adjust_bit_allocation (IMCContext *q, IMCChannel *chctx, int summer)
 Increase highest' band coefficient sizes as some bits won't be used. More...
 
static void imc_imdct256 (IMCContext *q, IMCChannel *chctx, int channels)
 
static int inverse_quant_coeff (IMCContext *q, IMCChannel *chctx, int stream_format_code)
 
static void imc_get_coeffs (AVCodecContext *avctx, IMCContext *q, IMCChannel *chctx)
 
static void imc_refine_bit_allocation (IMCContext *q, IMCChannel *chctx)
 
static int imc_decode_block (AVCodecContext *avctx, IMCContext *q, int ch)
 
static int imc_decode_frame (AVCodecContext *avctx, void *data, int *got_frame_ptr, AVPacket *avpkt)
 
static av_cold int imc_decode_close (AVCodecContext *avctx)
 
static av_cold void flush (AVCodecContext *avctx)
 

Variables

static VLC huffman_vlc [4][4]
 
static VLC_TYPE vlc_tables [VLC_TABLES_SIZE][2]
 

Detailed Description

IMC - Intel Music Coder A mdct based codec using a 256 points large transform divided into 32 bands with some mix of scale factors.

Only mono is supported.

Definition in file imc.c.

Macro Definition Documentation

#define IMC_BLOCK_SIZE   64

Definition at line 53 of file imc.c.

Referenced by imc_decode_frame().

#define IMC_FRAME_ID   0x21

Definition at line 54 of file imc.c.

#define BANDS   32
#define COEFFS   256

Definition at line 56 of file imc.c.

Referenced by imc_decode_block(), imc_decode_frame(), imc_decode_init(), and imc_imdct256().

#define IMC_VLC_BITS   9

Definition at line 116 of file imc.c.

Referenced by imc_init_static(), and imc_read_level_coeffs().

#define VLC_TABLES_SIZE   9512

Definition at line 117 of file imc.c.

Referenced by imc_init_static().

Function Documentation

static double freq2bark ( double  freq)
inlinestatic

Definition at line 121 of file imc.c.

Referenced by iac_generate_tabs().

static av_cold void iac_generate_tabs ( IMCContext q,
int  sampling_rate 
)
static

Definition at line 126 of file imc.c.

Referenced by imc_decode_init().

static av_cold void imc_init_static ( void  )
static

Definition at line 177 of file imc.c.

Referenced by imc_decode_init().

static av_cold int imc_decode_init ( AVCodecContext avctx)
static

Definition at line 193 of file imc.c.

Referenced by flush().

static void imc_calculate_coeffs ( IMCContext q,
float *  flcoeffs1,
float *  flcoeffs2,
int bandWidthT,
float *  flcoeffs3,
float *  flcoeffs5 
)
static

Definition at line 281 of file imc.c.

Referenced by imc_decode_block().

static void imc_read_level_coeffs ( IMCContext q,
int  stream_format_code,
int levlCoeffs 
)
static

Definition at line 336 of file imc.c.

Referenced by imc_decode_block().

static void imc_read_level_coeffs_raw ( IMCContext q,
int  stream_format_code,
int levlCoeffs 
)
static

Definition at line 364 of file imc.c.

Referenced by imc_decode_block().

static void imc_decode_level_coefficients ( IMCContext q,
int levlCoeffBuf,
float *  flcoeffs1,
float *  flcoeffs2 
)
static

Definition at line 375 of file imc.c.

Referenced by imc_decode_block().

static void imc_decode_level_coefficients2 ( IMCContext q,
int levlCoeffBuf,
float *  old_floor,
float *  flcoeffs1,
float *  flcoeffs2 
)
static

Definition at line 409 of file imc.c.

Referenced by imc_decode_block().

static void imc_decode_level_coefficients_raw ( IMCContext q,
int levlCoeffBuf,
float *  flcoeffs1,
float *  flcoeffs2 
)
static

Definition at line 429 of file imc.c.

Referenced by imc_decode_block().

static int bit_allocation ( IMCContext q,
IMCChannel chctx,
int  stream_format_code,
int  freebits,
int  flag 
)
static

Perform bit allocation depending on bits available.

Definition at line 454 of file imc.c.

Referenced by imc_decode_block().

static void imc_get_skip_coeff ( IMCContext q,
IMCChannel chctx 
)
static

Definition at line 630 of file imc.c.

Referenced by imc_refine_bit_allocation().

static void imc_adjust_bit_allocation ( IMCContext q,
IMCChannel chctx,
int  summer 
)
static

Increase highest' band coefficient sizes as some bits won't be used.

Definition at line 686 of file imc.c.

Referenced by imc_refine_bit_allocation().

static void imc_imdct256 ( IMCContext q,
IMCChannel chctx,
int  channels 
)
static

Definition at line 728 of file imc.c.

Referenced by imc_decode_block().

static int inverse_quant_coeff ( IMCContext q,
IMCChannel chctx,
int  stream_format_code 
)
static

Definition at line 761 of file imc.c.

Referenced by imc_decode_block().

static void imc_get_coeffs ( AVCodecContext avctx,
IMCContext q,
IMCChannel chctx 
)
static

Definition at line 801 of file imc.c.

Referenced by imc_decode_block().

static void imc_refine_bit_allocation ( IMCContext q,
IMCChannel chctx 
)
static

Definition at line 829 of file imc.c.

Referenced by imc_decode_block().

static int imc_decode_block ( AVCodecContext avctx,
IMCContext q,
int  ch 
)
static

Definition at line 873 of file imc.c.

Referenced by imc_decode_frame().

static int imc_decode_frame ( AVCodecContext avctx,
void data,
int got_frame_ptr,
AVPacket avpkt 
)
static

Definition at line 1022 of file imc.c.

Referenced by flush().

static av_cold int imc_decode_close ( AVCodecContext avctx)
static

Definition at line 1069 of file imc.c.

Referenced by flush().

static av_cold void flush ( AVCodecContext avctx)
static

Definition at line 1078 of file imc.c.

Variable Documentation

VLC huffman_vlc[4][4]
static

Definition at line 114 of file imc.c.

VLC_TYPE vlc_tables[VLC_TABLES_SIZE][2]
static

Definition at line 119 of file imc.c.

Referenced by imc_init_static(), and unpack_dct_coeffs().