#include "avcodec.h"
#include "put_bits.h"
#include "dsputil.h"
#include "lpc.h"
#include "mathops.h"

Data Structures
struct	RiceContext
struct	AlacLPCContext
struct	AlacEncodeContext

Macros
#define	DEFAULT_FRAME_SIZE 4096
	ALAC audio encoder Copyright (c) 2008 Jaikrishnan Menon reali.nosp@m.tyma.nosp@m.n@gmx.nosp@m..net
#define	DEFAULT_SAMPLE_SIZE 16
#define	MAX_CHANNELS 8
#define	ALAC_EXTRADATA_SIZE 36
#define	ALAC_FRAME_HEADER_SIZE 55
#define	ALAC_FRAME_FOOTER_SIZE 3
#define	ALAC_ESCAPE_CODE 0x1FF
#define	ALAC_MAX_LPC_ORDER 30
#define	DEFAULT_MAX_PRED_ORDER 6
#define	DEFAULT_MIN_PRED_ORDER 4
#define	ALAC_MAX_LPC_PRECISION 9
#define	ALAC_MAX_LPC_SHIFT 9
#define	ALAC_CHMODE_LEFT_RIGHT 0
#define	ALAC_CHMODE_LEFT_SIDE 1
#define	ALAC_CHMODE_RIGHT_SIDE 2
#define	ALAC_CHMODE_MID_SIDE 3

Typedefs
typedef struct RiceContext	RiceContext
typedef struct AlacLPCContext	AlacLPCContext
typedef struct AlacEncodeContext	AlacEncodeContext

Functions
static void	init_sample_buffers (AlacEncodeContext s, const int16_t input_samples)
static void	encode_scalar (AlacEncodeContext *s, int x, int k, int write_sample_size)
static void	write_frame_header (AlacEncodeContext *s, int is_verbatim)
static void	calc_predictor_params (AlacEncodeContext *s, int ch)
static int	estimate_stereo_mode (int32_t left_ch, int32_t right_ch, int n)
static void	alac_stereo_decorrelation (AlacEncodeContext *s)
static void	alac_linear_predictor (AlacEncodeContext *s, int ch)
static void	alac_entropy_coder (AlacEncodeContext *s)
static void	write_compressed_frame (AlacEncodeContext *s)
static av_cold int	alac_encode_init (AVCodecContext *avctx)
static int	alac_encode_frame (AVCodecContext avctx, uint8_t frame, int buf_size, void *data)
static av_cold int	alac_encode_close (AVCodecContext *avctx)

Variables
AVCodec	ff_alac_encoder

Macro Definition Documentation

#define ALAC_CHMODE_LEFT_RIGHT 0

Definition at line 42 of file alacenc.c.

Referenced by alac_stereo_decorrelation().

#define ALAC_CHMODE_LEFT_SIDE 1

Definition at line 43 of file alacenc.c.

Referenced by alac_stereo_decorrelation().

#define ALAC_CHMODE_MID_SIDE 3

Definition at line 45 of file alacenc.c.

#define ALAC_CHMODE_RIGHT_SIDE 2

Definition at line 44 of file alacenc.c.

Referenced by alac_stereo_decorrelation().

#define ALAC_ESCAPE_CODE 0x1FF

Definition at line 35 of file alacenc.c.

Referenced by encode_scalar().

#define ALAC_EXTRADATA_SIZE 36

Definition at line 31 of file alacenc.c.

Referenced by alac_encode_init().

#define ALAC_FRAME_FOOTER_SIZE 3

Definition at line 33 of file alacenc.c.

#define ALAC_FRAME_HEADER_SIZE 55

Definition at line 32 of file alacenc.c.

#define ALAC_MAX_LPC_ORDER 30

Definition at line 36 of file alacenc.c.

Referenced by alac_encode_init().

#define ALAC_MAX_LPC_PRECISION 9

Definition at line 39 of file alacenc.c.

Referenced by calc_predictor_params().

#define ALAC_MAX_LPC_SHIFT 9

Definition at line 40 of file alacenc.c.

Referenced by calc_predictor_params().

#define DEFAULT_FRAME_SIZE 4096

This file is part of Libav.

Libav is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version.

Libav is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with Libav; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

Definition at line 28 of file alacenc.c.

Referenced by alac_encode_frame(), and alac_encode_init().

#define DEFAULT_MAX_PRED_ORDER 6

Definition at line 37 of file alacenc.c.

Referenced by alac_encode_init().

#define DEFAULT_MIN_PRED_ORDER 4

Definition at line 38 of file alacenc.c.

Referenced by alac_encode_init().

#define DEFAULT_SAMPLE_SIZE 16

Definition at line 29 of file alacenc.c.

Referenced by alac_encode_init().

#define MAX_CHANNELS 8

Definition at line 30 of file alacenc.c.

Typedef Documentation

typedef struct AlacEncodeContext AlacEncodeContext

typedef struct AlacLPCContext AlacLPCContext

typedef struct RiceContext RiceContext

Function Documentation

static av_cold int alac_encode_close ( AVCodecContext * avctx )

static

Definition at line 539 of file alacenc.c.

static int alac_encode_frame	(	AVCodecContext *	avctx,
		uint8_t *	frame,
		int	buf_size,
		void *	data
	)

static

Definition at line 488 of file alacenc.c.

static av_cold int alac_encode_init ( AVCodecContext * avctx )

static

Definition at line 389 of file alacenc.c.

static void alac_entropy_coder ( AlacEncodeContext * s )

static

Definition at line 302 of file alacenc.c.

Referenced by write_compressed_frame().

static void alac_linear_predictor	(	AlacEncodeContext *	s,
		int	ch
	)

static

Definition at line 239 of file alacenc.c.

Referenced by write_compressed_frame().

static void alac_stereo_decorrelation ( AlacEncodeContext * s )

static

Definition at line 194 of file alacenc.c.

Referenced by write_compressed_frame().

static void calc_predictor_params	(	AlacEncodeContext *	s,
		int	ch
	)

static

Definition at line 130 of file alacenc.c.

Referenced by write_compressed_frame().

static void encode_scalar	(	AlacEncodeContext *	s,
		int	x,
		int	k,
		int	write_sample_size
	)

static

Definition at line 92 of file alacenc.c.

Referenced by alac_entropy_coder().

static int estimate_stereo_mode	(	int32_t *	left_ch,
		int32_t *	right_ch,
		int	n
	)

static

Definition at line 160 of file alacenc.c.

Referenced by alac_stereo_decorrelation().

static void init_sample_buffers	(	AlacEncodeContext *	s,
		const int16_t *	input_samples
	)

static

Definition at line 78 of file alacenc.c.

Referenced by alac_encode_frame().

static void write_compressed_frame ( AlacEncodeContext * s )

static

Definition at line 348 of file alacenc.c.

Referenced by alac_encode_frame().

static void write_frame_header	(	AlacEncodeContext *	s,
		int	is_verbatim
	)

static

Definition at line 120 of file alacenc.c.

Referenced by alac_encode_frame().

Variable Documentation

AVCodec ff_alac_encoder

Initial value:

 {
    .name           = "alac",
    .type           = AVMEDIA_TYPE_AUDIO,
    .id             = CODEC_ID_ALAC,
    .priv_data_size = sizeof(AlacEncodeContext),
    .init           = alac_encode_init,
    .encode         = alac_encode_frame,
    .close          = alac_encode_close,
    .capabilities = CODEC_CAP_SMALL_LAST_FRAME,
    .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
                                                  AV_SAMPLE_FMT_NONE },
    .long_name = NULL_IF_CONFIG_SMALL("ALAC (Apple Lossless Audio Codec)"),
}

Definition at line 549 of file alacenc.c.

Data Structures

Macros

Typedefs

Functions

Variables

Macro Definition Documentation

Typedef Documentation

Function Documentation

Variable Documentation