libavcodec/pcm.c File Reference

PCM codecs. More...

#include "avcodec.h"
#include "bitstream.h"
#include "bytestream.h"

Go to the source code of this file.

Data Structures
struct	PCMDecode
Defines
#define	MAX_CHANNELS   64
#define	SIGN_BIT   (0x80)
#define	QUANT_MASK   (0xf)
#define	NSEGS   (8)
#define	SEG_SHIFT   (4)
#define	SEG_MASK   (0x70)
#define	BIAS   (0x84)
#define	PCM_ENCODER(id, name)
#define	PCM_DECODER(id, name)
#define	PCM_CODEC(id, name)   PCM_ENCODER(id,name) PCM_DECODER(id,name)
Functions
static int	alaw2linear (unsigned char a_val)
static int	ulaw2linear (unsigned char u_val)
static void	build_xlaw_table (uint8_t *linear_to_xlaw, int(*xlaw2linear)(unsigned char), int mask)
static int	pcm_encode_init (AVCodecContext *avctx)
static int	pcm_encode_close (AVCodecContext *avctx)
static void	encode_from16 (int bps, int le, int us, short **samples, uint8_t **dst, int n)
	convert samples from 16 bit
static int	pcm_encode_frame (AVCodecContext *avctx, unsigned char *frame, int buf_size, void *data)
static int	pcm_decode_init (AVCodecContext *avctx)
static void	decode_to16 (int bps, int le, int us, const uint8_t **src, short **samples, int src_len)
	convert samples to 16 bit
static int	pcm_decode_frame (AVCodecContext *avctx, void *data, int *data_size, const uint8_t *buf, int buf_size)
	PCM_CODEC (CODEC_ID_PCM_S32LE, pcm_s32le)
	PCM_CODEC (CODEC_ID_PCM_S32BE, pcm_s32be)
	PCM_CODEC (CODEC_ID_PCM_U32LE, pcm_u32le)
	PCM_CODEC (CODEC_ID_PCM_U32BE, pcm_u32be)
	PCM_CODEC (CODEC_ID_PCM_S24LE, pcm_s24le)
	PCM_CODEC (CODEC_ID_PCM_S24BE, pcm_s24be)
	PCM_CODEC (CODEC_ID_PCM_U24LE, pcm_u24le)
	PCM_CODEC (CODEC_ID_PCM_U24BE, pcm_u24be)
	PCM_CODEC (CODEC_ID_PCM_S24DAUD, pcm_s24daud)
	PCM_CODEC (CODEC_ID_PCM_S16LE, pcm_s16le)
	PCM_DECODER (CODEC_ID_PCM_S16LE_PLANAR, pcm_s16le_planar)
	PCM_CODEC (CODEC_ID_PCM_S16BE, pcm_s16be)
	PCM_CODEC (CODEC_ID_PCM_U16LE, pcm_u16le)
	PCM_CODEC (CODEC_ID_PCM_U16BE, pcm_u16be)
	PCM_CODEC (CODEC_ID_PCM_S8, pcm_s8)
	PCM_CODEC (CODEC_ID_PCM_U8, pcm_u8)
	PCM_CODEC (CODEC_ID_PCM_ALAW, pcm_alaw)
	PCM_CODEC (CODEC_ID_PCM_MULAW, pcm_mulaw)
	PCM_CODEC (CODEC_ID_PCM_ZORK, pcm_zork)
Variables
static uint8_t	linear_to_alaw [16384]
static uint8_t	linear_to_ulaw [16384]

---

Detailed Description

PCM codecs.

Definition in file pcm.c.

---

Define Documentation

#define BIAS   (0x84)

Definition at line 41 of file pcm.c.

Referenced by ulaw2linear().

#define MAX_CHANNELS   64

Definition at line 31 of file pcm.c.

#define NSEGS   (8)

Definition at line 37 of file pcm.c.

#define PCM_CODEC	(	id,
		name		)	PCM_ENCODER(id,name) PCM_DECODER(id,name)

Definition at line 534 of file pcm.c.

#define PCM_DECODER	(	id,
		name		)

Definition at line 531 of file pcm.c.

#define PCM_ENCODER	(	id,
		name		)

Definition at line 515 of file pcm.c.

#define QUANT_MASK   (0xf)

Definition at line 36 of file pcm.c.

Referenced by alaw2linear(), and ulaw2linear().

#define SEG_MASK   (0x70)

Definition at line 39 of file pcm.c.

Referenced by alaw2linear().

#define SEG_SHIFT   (4)

Definition at line 38 of file pcm.c.

Referenced by alaw2linear(), and ulaw2linear().

#define SIGN_BIT   (0x80)

Definition at line 35 of file pcm.c.

Referenced by alaw2linear(), and ulaw2linear().

---

Function Documentation

static int alaw2linear

(

unsigned char

a_val

)

[static]

Definition at line 47 of file pcm.c.

Referenced by pcm_decode_init(), and pcm_encode_init().

static void build_xlaw_table	(	uint8_t *	linear_to_xlaw,
		int(*)(unsigned char)	xlaw2linear,
		int	mask
	)			[static]

Definition at line 83 of file pcm.c.

Referenced by pcm_encode_init().

static void decode_to16	(	int	bps,
		int	le,
		int	us,
		const uint8_t **	src,
		short **	samples,
		int	src_len
	)			[inline, static]

convert samples to 16 bit

Parameters:

	bps	byte per sample for the source format, must be >= 2
	le	0 for big-, 1 for little-endian
	us	0 for signed, 1 for unsigned input
	src	input samples
	samples	output samples
	src_len	number of bytes in src

Definition at line 357 of file pcm.c.

Referenced by pcm_decode_frame().

static void encode_from16	(	int	bps,
		int	le,
		int	us,
		short **	samples,
		uint8_t **	dst,
		int	n
	)			[inline, static]

convert samples from 16 bit

Parameters:

	bps	byte per sample for the destination format, must be >= 2
	le	0 for big-, 1 for little-endian
	us	0 for signed, 1 for unsigned output
	samples	input samples
	dst	output samples
	n	number of samples in samples buffer.

Definition at line 173 of file pcm.c.

Referenced by pcm_encode_frame().

PCM_CODEC	(	CODEC_ID_PCM_ZORK	,
		pcm_zork
	)

PCM_CODEC	(	CODEC_ID_PCM_MULAW	,
		pcm_mulaw
	)

PCM_CODEC	(	CODEC_ID_PCM_ALAW	,
		pcm_alaw
	)

PCM_CODEC	(	CODEC_ID_PCM_U8	,
		pcm_u8
	)

PCM_CODEC	(	CODEC_ID_PCM_S8	,
		pcm_s8
	)

PCM_CODEC	(	CODEC_ID_PCM_U16BE	,
		pcm_u16be
	)

PCM_CODEC	(	CODEC_ID_PCM_U16LE	,
		pcm_u16le
	)

PCM_CODEC	(	CODEC_ID_PCM_S16BE	,
		pcm_s16be
	)

PCM_CODEC	(	CODEC_ID_PCM_S16LE	,
		pcm_s16le
	)

PCM_CODEC	(	CODEC_ID_PCM_S24DAUD	,
		pcm_s24daud
	)

PCM_CODEC	(	CODEC_ID_PCM_U24BE	,
		pcm_u24be
	)

PCM_CODEC	(	CODEC_ID_PCM_U24LE	,
		pcm_u24le
	)

PCM_CODEC	(	CODEC_ID_PCM_S24BE	,
		pcm_s24be
	)

PCM_CODEC	(	CODEC_ID_PCM_S24LE	,
		pcm_s24le
	)

PCM_CODEC	(	CODEC_ID_PCM_U32BE	,
		pcm_u32be
	)

PCM_CODEC	(	CODEC_ID_PCM_U32LE	,
		pcm_u32le
	)

PCM_CODEC	(	CODEC_ID_PCM_S32BE	,
		pcm_s32be
	)

PCM_CODEC	(	CODEC_ID_PCM_S32LE	,
		pcm_s32le
	)

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

Definition at line 374 of file pcm.c.

static int pcm_decode_init

(

AVCodecContext *

avctx

)

[static]

Definition at line 328 of file pcm.c.

PCM_DECODER	(	CODEC_ID_PCM_S16LE_PLANAR	,
		pcm_s16le_planar
	)

static int pcm_encode_close

(

AVCodecContext *

avctx

)

[static]

Definition at line 157 of file pcm.c.

static int pcm_encode_frame	(	AVCodecContext *	avctx,
		unsigned char *	frame,
		int	buf_size,
		void *	data
	)			[static]

Definition at line 189 of file pcm.c.

static int pcm_encode_init

(

AVCodecContext *

avctx

)

[static]

Definition at line 107 of file pcm.c.

static int ulaw2linear

(

unsigned char

u_val

)

[static]

Definition at line 62 of file pcm.c.

Referenced by pcm_decode_init(), and pcm_encode_init().

---

Variable Documentation

uint8_t linear_to_alaw[16384] [static]

Definition at line 80 of file pcm.c.

Referenced by pcm_encode_frame(), and pcm_encode_init().

uint8_t linear_to_ulaw[16384] [static]

Definition at line 81 of file pcm.c.

Referenced by pcm_encode_frame(), and pcm_encode_init().