imc.c File Reference

#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

IMC_BLOCK_SIZE

#define IMC_BLOCK_SIZE   64

Definition at line 53 of file imc.c.

IMC_FRAME_ID

#define IMC_FRAME_ID   0x21

Definition at line 54 of file imc.c.

BANDS

#define BANDS   32

Definition at line 55 of file imc.c.

COEFFS

#define COEFFS   256

Definition at line 56 of file imc.c.

IMC_VLC_BITS

#define IMC_VLC_BITS   9

Definition at line 116 of file imc.c.

VLC_TABLES_SIZE

#define VLC_TABLES_SIZE   9512

Definition at line 117 of file imc.c.

Function Documentation

freq2bark()

static double freq2bark ( double  freq )

inlinestatic

Definition at line 121 of file imc.c.

Referenced by iac_generate_tabs().

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().

imc_init_static()

static av_cold void imc_init_static ( void  )

static

Definition at line 177 of file imc.c.

Referenced by imc_decode_init().

imc_decode_init()

static av_cold int imc_decode_init ( AVCodecContext *  avctx )

static

Definition at line 193 of file imc.c.

imc_calculate_coeffs()

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().

imc_read_level_coeffs()

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().

imc_read_level_coeffs_raw()

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().

imc_decode_level_coefficients()

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().

imc_decode_level_coefficients2()

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().

imc_decode_level_coefficients_raw()

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().

bit_allocation()

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().

imc_get_skip_coeff()

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().

imc_adjust_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().

imc_imdct256()

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

static

Definition at line 728 of file imc.c.

Referenced by imc_decode_block().

inverse_quant_coeff()

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().

imc_get_coeffs()

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().

imc_refine_bit_allocation()

static void imc_refine_bit_allocation ( IMCContext *  q, IMCChannel *  chctx  )

static

Definition at line 829 of file imc.c.

Referenced by imc_decode_block().

imc_decode_block()

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

static

Definition at line 872 of file imc.c.

Referenced by imc_decode_frame().

imc_decode_frame()

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

static

Definition at line 1021 of file imc.c.

imc_decode_close()

static av_cold int imc_decode_close ( AVCodecContext *  avctx )

static

Definition at line 1068 of file imc.c.

flush()

static av_cold void flush ( AVCodecContext *  avctx )

static

Definition at line 1077 of file imc.c.

Variable Documentation

huffman_vlc

VLC huffman_vlc[4][4]

static

Definition at line 114 of file imc.c.

Referenced by imc_init_static(), and imc_read_level_coeffs().

vlc_tables

VLC_TYPE vlc_tables[VLC_TABLES_SIZE][2]

static

Definition at line 119 of file imc.c.

Referenced by imc_init_static().