#include "avcodec.h"
#include "put_bits.h"
#include "internal.h"
#include "lpc.h"
#include "mathops.h"
#include "alac_data.h"

Include dependency graph for alacenc.c:

Go to the source code of this file.

Data Structures
struct	RiceContext

struct	AlacLPCContext

struct	AlacEncodeContext

Macros
#define	DEFAULT_FRAME_SIZE 4096

#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

#define	COPY_SAMPLES(type)

Typedefs
typedef struct RiceContext	RiceContext

typedef struct AlacLPCContext	AlacLPCContext

typedef struct AlacEncodeContext	AlacEncodeContext

Functions
static void	init_sample_buffers (AlacEncodeContext s, int channels, uint8_t const samples[2])

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

static void	write_element_header (AlacEncodeContext *s, enum AlacRawDataBlockType element, int instance)

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_element (AlacEncodeContext s, enum AlacRawDataBlockType element, int instance, const uint8_t samples0, const uint8_t *samples1)

static int	write_frame (AlacEncodeContext s, AVPacket avpkt, uint8_t const samples)

static av_always_inline int	get_max_frame_size (int frame_size, int ch, int bps)

static av_cold int	alac_encode_close (AVCodecContext *avctx)

static av_cold int	alac_encode_init (AVCodecContext *avctx)

static int	alac_encode_frame (AVCodecContext avctx, AVPacket avpkt, const AVFrame frame, int got_packet_ptr)

Variables
AVCodec	ff_alac_encoder

Macro Definition Documentation

#define ALAC_CHMODE_LEFT_RIGHT 0

Definition at line 41 of file alacenc.c.

Referenced by alac_stereo_decorrelation().

#define ALAC_CHMODE_LEFT_SIDE 1

Definition at line 42 of file alacenc.c.

Referenced by alac_stereo_decorrelation().

#define ALAC_CHMODE_MID_SIDE 3

Definition at line 44 of file alacenc.c.

#define ALAC_CHMODE_RIGHT_SIDE 2

Definition at line 43 of file alacenc.c.

Referenced by alac_stereo_decorrelation().

#define ALAC_ESCAPE_CODE 0x1FF

Definition at line 34 of file alacenc.c.

Referenced by encode_scalar().

#define ALAC_EXTRADATA_SIZE 36

Definition at line 30 of file alacenc.c.

Referenced by alac_encode_init().

#define ALAC_FRAME_FOOTER_SIZE 3

Definition at line 32 of file alacenc.c.

#define ALAC_FRAME_HEADER_SIZE 55

Definition at line 31 of file alacenc.c.

#define ALAC_MAX_LPC_ORDER 30

Definition at line 35 of file alacenc.c.

Referenced by alac_encode_init().

#define ALAC_MAX_LPC_PRECISION 9

Definition at line 38 of file alacenc.c.

Referenced by calc_predictor_params().

#define ALAC_MAX_LPC_SHIFT 9

Definition at line 39 of file alacenc.c.

Referenced by calc_predictor_params().

#define COPY_SAMPLES ( type )

Value:

do {                             \
        for (ch = 0; ch < channels; ch++) {                 \
            int32_t       *bptr = s->sample_buf[ch];        \
            const type *sptr = (const type *)samples[ch];   \
            for (i = 0; i < s->frame_size; i++)             \
                bptr[i] = sptr[i] >> shift;                 \
        }                                                   \
    } while (0)

Referenced by init_sample_buffers().

#define DEFAULT_FRAME_SIZE 4096

Definition at line 29 of file alacenc.c.

Referenced by alac_encode_frame(), alac_encode_init(), get_max_frame_size(), and write_element_header().

#define DEFAULT_MAX_PRED_ORDER 6

Definition at line 36 of file alacenc.c.

Referenced by alac_encode_init().

#define DEFAULT_MIN_PRED_ORDER 4

Definition at line 37 of file alacenc.c.

Referenced by alac_encode_init().

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 480 of file alacenc.c.

Referenced by alac_encode_init().

static int alac_encode_frame	(	AVCodecContext *	avctx,
		AVPacket *	avpkt,
		const AVFrame *	frame,
		int *	got_packet_ptr
	)

static

Definition at line 602 of file alacenc.c.

static av_cold int alac_encode_init ( AVCodecContext * avctx )

static

Definition at line 490 of file alacenc.c.

static void alac_entropy_coder ( AlacEncodeContext * s )

static

Definition at line 316 of file alacenc.c.

Referenced by write_element().

static void alac_linear_predictor	(	AlacEncodeContext *	s,
		int	ch
	)

static

Definition at line 252 of file alacenc.c.

Referenced by write_element().

static void alac_stereo_decorrelation ( AlacEncodeContext * s )

static

Definition at line 212 of file alacenc.c.

Referenced by write_element().

static void calc_predictor_params	(	AlacEncodeContext *	s,
		int	ch
	)

static

Definition at line 149 of file alacenc.c.

Referenced by write_element().

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

static

Definition at line 102 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 179 of file alacenc.c.

Referenced by alac_stereo_decorrelation().

static av_always_inline int get_max_frame_size	(	int	frame_size,
		int	ch,
		int	bps
	)

static

Definition at line 474 of file alacenc.c.

Referenced by alac_encode_frame(), and alac_encode_init().

static void init_sample_buffers	(	AlacEncodeContext *	s,
		int	channels,
		uint8_t const *	samples[2]
	)

static

Definition at line 80 of file alacenc.c.

Referenced by write_element().

static void write_element	(	AlacEncodeContext *	s,
		enum AlacRawDataBlockType	element,
		int	instance,
		const uint8_t *	samples0,
		const uint8_t *	samples1
	)

static

Definition at line 360 of file alacenc.c.

Referenced by write_frame().

static void write_element_header	(	AlacEncodeContext *	s,
		enum AlacRawDataBlockType	element,
		int	instance
	)

static

Definition at line 130 of file alacenc.c.

Referenced by write_element().

static int write_frame	(	AlacEncodeContext *	s,
		AVPacket *	avpkt,
		uint8_t const	samples
	)

static

Definition at line 443 of file alacenc.c.

Referenced by alac_encode_frame().

Variable Documentation

AVCodec ff_alac_encoder

Initial value:

= {
    .name           = "alac",
    .type           = AVMEDIA_TYPE_AUDIO,
    .id             = AV_CODEC_ID_ALAC,
    .priv_data_size = sizeof(AlacEncodeContext),
    .init           = alac_encode_init,
    .encode2        = alac_encode_frame,
    .close          = alac_encode_close,
    .capabilities   = CODEC_CAP_SMALL_LAST_FRAME,
    .channel_layouts = ff_alac_channel_layouts,
    .sample_fmts    = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S32P,
                                                     AV_SAMPLE_FMT_S16P,
                                                     AV_SAMPLE_FMT_NONE },
    .long_name      = NULL_IF_CONFIG_SMALL("ALAC (Apple Lossless Audio Codec)"),
}

Definition at line 642 of file alacenc.c.

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Data Structures

Macros

Typedefs

Functions

Variables

Macro Definition Documentation

Typedef Documentation

Function Documentation

Variable Documentation