g722enc.c File Reference

G.722 ADPCM audio encoder. More...

#include "libavutil/avassert.h"
#include "avcodec.h"
#include "internal.h"
#include "g722.h"
#include "libavutil/common.h"

Go to the source code of this file.

Macros
#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_close (AVCodecContext *avctx)
static av_cold int	g722_encode_init (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, AVPacket *avpkt, const AVFrame *frame, int *got_packet_ptr)

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.

Macro Definition Documentation

#define FREEZE_INTERVAL   128

Definition at line 36 of file g722enc.c.

Referenced by g722_encode_init(), and g722_encode_trellis().

#define MAX_FRAME_SIZE   32768

Definition at line 40 of file g722enc.c.

Referenced by g722_encode_init().

#define MIN_TRELLIS   0

Definition at line 44 of file g722enc.c.

Referenced by g722_encode_init().

#define MAX_TRELLIS   16

Definition at line 45 of file g722enc.c.

Referenced by g722_encode_init().

#define STORE_NODE	(		index,
			UPDATE,
			VALUE
	)

Referenced by g722_encode_trellis().

Function Documentation

static av_cold int g722_encode_close ( AVCodecContext *  avctx )

static

Definition at line 47 of file g722enc.c.

Referenced by g722_encode_init().

static av_cold int g722_encode_init ( AVCodecContext *  avctx )

static

Definition at line 59 of file g722enc.c.

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

inlinestatic

Definition at line 138 of file g722enc.c.

Referenced by encode_byte(), and g722_encode_trellis().

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

inlinestatic

Definition at line 155 of file g722enc.c.

Referenced by encode_byte().

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

inlinestatic

Definition at line 163 of file g722enc.c.

Referenced by encode_byte(), and g722_encode_trellis().

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

static

Definition at line 177 of file g722enc.c.

Referenced by g722_encode_frame().

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

static

Definition at line 331 of file g722enc.c.

Referenced by g722_encode_frame(), and g722_encode_no_trellis().

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

static

Definition at line 344 of file g722enc.c.

Referenced by g722_encode_frame().

static int g722_encode_frame ( AVCodecContext *  avctx, AVPacket *  avpkt, const AVFrame *  frame, int *  got_packet_ptr  )

static

Definition at line 353 of file g722enc.c.

Variable Documentation

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 131 of file g722enc.c.

Referenced by encode_low().

AVCodec ff_adpcm_g722_encoder

Initial value:

= {
    .name           = "g722",
    .long_name      = NULL_IF_CONFIG_SMALL("G.722 ADPCM"),
    .type           = AVMEDIA_TYPE_AUDIO,
    .id             = AV_CODEC_ID_ADPCM_G722,
    .priv_data_size = sizeof(G722Context),
    .init           = g722_encode_init,
    .close          = g722_encode_close,
    .encode2        = g722_encode_frame,
    .capabilities   = CODEC_CAP_SMALL_LAST_FRAME,
    .sample_fmts    = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
                                                     AV_SAMPLE_FMT_NONE },
}

Definition at line 383 of file g722enc.c.