imc.c File Reference

---

Detailed Description

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

Only mono is supported.

Definition in file imc.c.

Go to the source code of this file.

Classes
struct	IMCContext
Functions
static 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_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 int	bit_allocation (IMCContext *q, int stream_format_code, int freebits, int flag)
	Perform bit allocation depending on bits available.
static void	imc_get_skip_coeff (IMCContext *q)
static void	imc_adjust_bit_allocation (IMCContext *q, int summer)
	Increase highest' band coefficient sizes as some bits won't be used.
static void	imc_imdct256 (IMCContext *q)
static int	inverse_quant_coeff (IMCContext *q, int stream_format_code)
static int	imc_get_coeffs (IMCContext *q)
static int	imc_decode_frame (AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size)
static int	imc_decode_close (AVCodecContext *avctx)
Variables
AVCodec	imc_decoder

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Function Documentation

static int imc_decode_init

(

AVCodecContext *

avctx

)

[static]

Definition at line 92 of file imc.c.

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

Definition at line 148 of file imc.c.

Referenced by imc_decode_frame().

static void imc_read_level_coeffs	(	IMCContext *	q,
		int	stream_format_code,
		int *	levlCoeffs
	)			[static]

Definition at line 202 of file imc.c.

Referenced by imc_decode_frame().

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

Definition at line 228 of file imc.c.

Referenced by imc_decode_frame().

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

Definition at line 262 of file imc.c.

Referenced by imc_decode_frame().

static int bit_allocation	(	IMCContext *	q,
		int	stream_format_code,
		int	freebits,
		int	flag
	)			[static]

Perform bit allocation depending on bits available.

Definition at line 282 of file imc.c.

Referenced by imc_decode_frame().

static void imc_get_skip_coeff

(

IMCContext *

q

)

[static]

Definition at line 444 of file imc.c.

Referenced by imc_decode_frame().

static void imc_adjust_bit_allocation	(	IMCContext *	q,
		int	summer
	)			[static]

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

Definition at line 498 of file imc.c.

Referenced by imc_decode_frame().

static void imc_imdct256

(

IMCContext *

q

)

[static]

Definition at line 537 of file imc.c.

Referenced by imc_decode_frame().

static int inverse_quant_coeff	(	IMCContext *	q,
		int	stream_format_code
	)			[static]

Definition at line 563 of file imc.c.

Referenced by imc_decode_frame().

static int imc_get_coeffs

(

IMCContext *

q

)

[static]

Definition at line 601 of file imc.c.

Referenced by imc_decode_frame().

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

Definition at line 626 of file imc.c.

static int imc_decode_close

(

AVCodecContext *

avctx

)

[static]

Definition at line 795 of file imc.c.

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Variable Documentation

AVCodec imc_decoder

Initial value:

 {
    .name = "imc",
    .type = CODEC_TYPE_AUDIO,
    .id = CODEC_ID_IMC,
    .priv_data_size = sizeof(IMCContext),
    .init = imc_decode_init,
    .close = imc_decode_close,
    .decode = imc_decode_frame,
}

Definition at line 804 of file imc.c.