libavcodec/g722enc.c File Reference

G.722 ADPCM audio encoder. More...

#include "avcodec.h"
#include "g722.h"

Go to the source code of this file.

Defines
#define	FREEZE_INTERVAL   128
#define	MAX_FRAME_SIZE   32768
#define	MIN_TRELLIS   0
#define	MAX_TRELLIS   16
#define	STORE_NODE(index, UPDATE, VALUE)
Functions
static av_cold int	g722_encode_init (AVCodecContext *avctx)
static av_cold int	g722_encode_close (AVCodecContext *avctx)
static void	filter_samples (G722Context *c, const int16_t *samples, int *xlow, int *xhigh)
static int	encode_high (const struct G722Band *state, int xhigh)
static int	encode_low (const struct G722Band *state, int xlow)
static void	g722_encode_trellis (G722Context *c, int trellis, uint8_t *dst, int nb_samples, const int16_t *samples)
static av_always_inline void	encode_byte (G722Context *c, uint8_t *dst, const int16_t *samples)
static void	g722_encode_no_trellis (G722Context *c, uint8_t *dst, int nb_samples, const int16_t *samples)
static int	g722_encode_frame (AVCodecContext *avctx, uint8_t *dst, int buf_size, void *data)
Variables
static const int16_t	low_quant [33]
AVCodec	ff_adpcm_g722_encoder

---

Detailed Description

G.722 ADPCM audio encoder.

Definition in file g722enc.c.

---

Define Documentation

#define FREEZE_INTERVAL   128

Definition at line 33 of file g722enc.c.

#define MAX_FRAME_SIZE   32768

Definition at line 37 of file g722enc.c.

#define MAX_TRELLIS   16

Definition at line 42 of file g722enc.c.

Referenced by g722_encode_init().

#define MIN_TRELLIS   0

Definition at line 41 of file g722enc.c.

Referenced by g722_encode_init().

#define STORE_NODE	(	index,
		UPDATE,
		VALUE		)

---

Function Documentation

static av_always_inline void encode_byte	(	G722Context *	c,
		uint8_t *	dst,
		const int16_t *	samples
	)			[static]

Definition at line 315 of file g722enc.c.

static int encode_high	(	const struct G722Band *	state,
		int	xhigh
	)			[inline, static]

Definition at line 141 of file g722enc.c.

static int encode_low	(	const struct G722Band *	state,
		int	xlow
	)			[inline, static]

Definition at line 149 of file g722enc.c.

Referenced by g722_encode_trellis().

static void filter_samples	(	G722Context *	c,
		const int16_t *	samples,
		int *	xlow,
		int *	xhigh
	)			[inline, static]

Definition at line 124 of file g722enc.c.

Referenced by avfilter_filter_samples(), and g722_encode_trellis().

static av_cold int g722_encode_close

(

AVCodecContext *

avctx

)

[static]

Definition at line 105 of file g722enc.c.

static int g722_encode_frame	(	AVCodecContext *	avctx,
		uint8_t *	dst,
		int	buf_size,
		void *	data
	)			[static]

Definition at line 337 of file g722enc.c.

static av_cold int g722_encode_init

(

AVCodecContext *

avctx

)

[static]

Definition at line 44 of file g722enc.c.

static void g722_encode_no_trellis	(	G722Context *	c,
		uint8_t *	dst,
		int	nb_samples,
		const int16_t *	samples
	)			[static]

Definition at line 328 of file g722enc.c.

static void g722_encode_trellis	(	G722Context *	c,
		int	trellis,
		uint8_t *	dst,
		int	nb_samples,
		const int16_t *	samples
	)			[static]

Definition at line 163 of file g722enc.c.

---

Variable Documentation

AVCodec ff_adpcm_g722_encoder

Initial value:

 {
    .name           = "g722",
    .type           = AVMEDIA_TYPE_AUDIO,
    .id             = CODEC_ID_ADPCM_G722,
    .priv_data_size = sizeof(G722Context),
    .init           = g722_encode_init,
    .close          = g722_encode_close,
    .encode         = g722_encode_frame,
    .capabilities   = CODEC_CAP_SMALL_LAST_FRAME,
    .long_name      = NULL_IF_CONFIG_SMALL("G.722 ADPCM"),
    .sample_fmts    = (const enum AVSampleFormat[]){AV_SAMPLE_FMT_S16,AV_SAMPLE_FMT_NONE},
}

Definition at line 360 of file g722enc.c.

const int16_t low_quant[33] [static]

Initial value:

 {
      35,   72,  110,  150,  190,  233,  276,  323,
     370,  422,  473,  530,  587,  650,  714,  786,
     858,  940, 1023, 1121, 1219, 1339, 1458, 1612,
    1765, 1980, 2195, 2557, 2919
}

Definition at line 117 of file g722enc.c.

Referenced by encode_low().