adxdec.c File Reference

SEGA CRI adx codecs. More...

#include "libavutil/attributes.h"
#include "libavutil/intreadwrite.h"
#include "avcodec.h"
#include "adx.h"
#include "codec_internal.h"
#include "decode.h"
#include "get_bits.h"

Go to the source code of this file.

Functions
static int	adx_decode_header (AVCodecContext *avctx, const uint8_t *buf, int bufsize, int *header_size, int *coeff)
	Decode ADX stream header.
static av_cold int	adx_decode_init (AVCodecContext *avctx)
static int	adx_decode (ADXContext *c, int16_t *out, int offset, const uint8_t *in, int ch)
	Decode 32 samples from 18 bytes.
static int	adx_decode_frame (AVCodecContext *avctx, AVFrame *frame, int *got_frame_ptr, AVPacket *avpkt)
static av_cold void	adx_decode_flush (AVCodecContext *avctx)

Variables
const FFCodec	ff_adpcm_adx_decoder

Detailed Description

SEGA CRI adx codecs.

Reference documents: http://ku-www.ss.titech.ac.jp/~yatsushi/adx.html adx2wav & wav2adx http://www.geocities.co.jp/Playtown/2004/

Definition in file adxdec.c.

Function Documentation

adx_decode_header()

static int adx_decode_header ( AVCodecContext * avctx, const uint8_t * buf, int bufsize, int * header_size, int * coeff )

static

Decode ADX stream header.

Sets avctx->channels and avctx->sample_rate.

Parameters

	avctx	codec context
	buf	header data
	bufsize	data size, should be at least 24 bytes
[out]	header_size	size of ADX header
[out]	coeff	2 LPC coefficients, can be NULL

Returns

data offset or negative error code if header is invalid

Definition at line 50 of file adxdec.c.

Referenced by adx_decode_frame(), and adx_decode_init().

adx_decode_init()

static av_cold int adx_decode_init ( AVCodecContext * avctx )

static

Definition at line 102 of file adxdec.c.

adx_decode()

static int adx_decode ( ADXContext * c, int16_t * out, int offset, const uint8_t * in, int ch )

static

Decode 32 samples from 18 bytes.

A 16-bit scalar value is applied to 32 residuals, which then have a 2nd-order LPC filter applied to it to form the output signal for a single channel.

Definition at line 130 of file adxdec.c.

Referenced by adx_decode_frame().

adx_decode_frame()

static int adx_decode_frame ( AVCodecContext * avctx, AVFrame * frame, int * got_frame_ptr, AVPacket * avpkt )

static

Definition at line 160 of file adxdec.c.

adx_decode_flush()

static av_cold void adx_decode_flush ( AVCodecContext * avctx )

static

Definition at line 255 of file adxdec.c.

Variable Documentation

ff_adpcm_adx_decoder

const FFCodec ff_adpcm_adx_decoder

Initial value:

= {
    .p.name         = "adpcm_adx",
    CODEC_LONG_NAME("SEGA CRI ADX ADPCM"),
    .p.type         = AVMEDIA_TYPE_AUDIO,
    .p.id           = AV_CODEC_ID_ADPCM_ADX,
    .priv_data_size = sizeof(ADXContext),
    .init           = adx_decode_init,
    FF_CODEC_DECODE_CB(adx_decode_frame),
    .flush          = adx_decode_flush,
    .p.capabilities = AV_CODEC_CAP_CHANNEL_CONF |
                      AV_CODEC_CAP_DR1,
}

Definition at line 262 of file adxdec.c.