ADPCM encoders First version by Francois Revol (revol.nosp@m.@fre.nosp@m.e.fr) Fringe ADPCM codecs (e.g., DK3, DK4, Westwood) by Mike Melanson (melan.nosp@m.son@.nosp@m.pcisy.nosp@m.s.ne.nosp@m.t) More...

#include "avcodec.h"
#include "get_bits.h"
#include "put_bits.h"
#include "bytestream.h"
#include "adpcm.h"
#include "adpcm_data.h"
#include "internal.h"

Go to the source code of this file.

Data Structures
struct	TrellisPath

struct	TrellisNode

struct	ADPCMEncodeContext

Macros
#define	FREEZE_INTERVAL 128

#define	STORE_NODE(NAME, STEP_INDEX)

#define	LOOP_NODES(NAME, STEP_TABLE, STEP_INDEX)

#define	ADPCM_ENCODER(id_, name_, sample_fmts_, long_name_)

Typedefs
typedef struct TrellisPath	TrellisPath

typedef struct TrellisNode	TrellisNode

typedef struct ADPCMEncodeContext	ADPCMEncodeContext

Functions
static av_cold int	adpcm_encode_init (AVCodecContext *avctx)

static av_cold int	adpcm_encode_close (AVCodecContext *avctx)

static uint8_t	adpcm_ima_compress_sample (ADPCMChannelStatus *c, int16_t sample)

static uint8_t	adpcm_ima_qt_compress_sample (ADPCMChannelStatus *c, int16_t sample)

static uint8_t	adpcm_ms_compress_sample (ADPCMChannelStatus *c, int16_t sample)

static uint8_t	adpcm_yamaha_compress_sample (ADPCMChannelStatus *c, int16_t sample)

static void	adpcm_compress_trellis (AVCodecContext avctx, const int16_t samples, uint8_t dst, ADPCMChannelStatus c, int n, int stride)

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

	ADPCM_ENCODER (AV_CODEC_ID_ADPCM_IMA_QT, adpcm_ima_qt, sample_fmts_p,"ADPCM IMA QuickTime")

	ADPCM_ENCODER (AV_CODEC_ID_ADPCM_IMA_WAV, adpcm_ima_wav, sample_fmts_p,"ADPCM IMA WAV")

	ADPCM_ENCODER (AV_CODEC_ID_ADPCM_MS, adpcm_ms, sample_fmts,"ADPCM Microsoft")

	ADPCM_ENCODER (AV_CODEC_ID_ADPCM_SWF, adpcm_swf, sample_fmts,"ADPCM Shockwave Flash")

	ADPCM_ENCODER (AV_CODEC_ID_ADPCM_YAMAHA, adpcm_yamaha, sample_fmts,"ADPCM Yamaha")

Variables
static enum AVSampleFormat	sample_fmts []

static enum AVSampleFormat	sample_fmts_p []

Detailed Description

ADPCM encoders First version by Francois Revol (revol.nosp@m.@fre.nosp@m.e.fr) Fringe ADPCM codecs (e.g., DK3, DK4, Westwood) by Mike Melanson (melan.nosp@m.son@.nosp@m.pcisy.nosp@m.s.ne.nosp@m.t)

See ADPCM decoder reference documents for codec information.

Definition in file adpcmenc.c.

Macro Definition Documentation

#define ADPCM_ENCODER	(	id_,
		name_,
		sample_fmts_,
		long_name_
	)

Value:

AVCodec ff_ ## name_ ## _encoder = {                        \
    .name           = #name_,                               \
    .type           = AVMEDIA_TYPE_AUDIO,                   \
    .id             = id_,                                  \
    .priv_data_size = sizeof(ADPCMEncodeContext),           \
    .init           = adpcm_encode_init,                    \
    .encode2        = adpcm_encode_frame,                   \
    .close          = adpcm_encode_close,                   \
    .sample_fmts    = sample_fmts_,                         \
    .long_name      = NULL_IF_CONFIG_SMALL(long_name_),     \
}

Definition at line 717 of file adpcmenc.c.

#define FREEZE_INTERVAL 128

Definition at line 60 of file adpcmenc.c.

Referenced by adpcm_compress_trellis(), and adpcm_encode_init().

#define LOOP_NODES	(	NAME,
		STEP_TABLE,
		STEP_INDEX
	)

Value:

const int predictor = nodes[j]->sample1;\
                const int div = (sample - predictor) * 4 / STEP_TABLE;\
                int nmin = av_clip(div - range, -7, 6);\
                int nmax = av_clip(div + range, -6, 7);\
                if (nmin <= 0)\
                    nmin--; /* distinguish -0 from +0 */\
                if (nmax < 0)\
                    nmax--;\
                for (nidx = nmin; nidx <= nmax; nidx++) {\
                    const int nibble = nidx < 0 ? 7 - nidx : nidx;\
                    int dec_sample = predictor +\
                                    (STEP_TABLE *\
                                     ff_adpcm_yamaha_difflookup[nibble]) / 8;\
                    STORE_NODE(NAME, STEP_INDEX);\
                }

Referenced by adpcm_compress_trellis().

#define STORE_NODE	(	NAME,
		STEP_INDEX
	)

Referenced by adpcm_compress_trellis().

Typedef Documentation

typedef struct ADPCMEncodeContext ADPCMEncodeContext

typedef struct TrellisNode TrellisNode

typedef struct TrellisPath TrellisPath

Function Documentation

static void adpcm_compress_trellis	(	AVCodecContext *	avctx,
		const int16_t *	samples,
		uint8_t *	dst,
		ADPCMChannelStatus *	c,
		int	n,
		int	stride
	)

static

Definition at line 272 of file adpcmenc.c.

Referenced by adpcm_encode_frame().

static av_cold int adpcm_encode_close ( AVCodecContext * avctx )

static

Definition at line 159 of file adpcmenc.c.

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

static

Definition at line 477 of file adpcmenc.c.

static av_cold int adpcm_encode_init ( AVCodecContext * avctx )

static

Definition at line 62 of file adpcmenc.c.

ADPCM_ENCODER	(	AV_CODEC_ID_ADPCM_IMA_QT	,
		adpcm_ima_qt	,
		sample_fmts_p	,
		"ADPCM IMA QuickTime"
	)

ADPCM_ENCODER	(	AV_CODEC_ID_ADPCM_IMA_WAV	,
		adpcm_ima_wav	,
		sample_fmts_p	,
		"ADPCM IMA WAV"
	)

ADPCM_ENCODER	(	AV_CODEC_ID_ADPCM_MS	,
		adpcm_ms	,
		sample_fmts	,
		"ADPCM Microsoft"
	)

ADPCM_ENCODER	(	AV_CODEC_ID_ADPCM_SWF	,
		adpcm_swf	,
		sample_fmts	,
		"ADPCM Shockwave Flash"
	)

ADPCM_ENCODER	(	AV_CODEC_ID_ADPCM_YAMAHA	,
		adpcm_yamaha	,
		sample_fmts	,
		"ADPCM Yamaha"
	)

static uint8_t adpcm_ima_compress_sample	(	ADPCMChannelStatus *	c,
		int16_t	sample
	)

inlinestatic

Definition at line 174 of file adpcmenc.c.

Referenced by adpcm_encode_frame().

static uint8_t adpcm_ima_qt_compress_sample	(	ADPCMChannelStatus *	c,
		int16_t	sample
	)

inlinestatic

Definition at line 187 of file adpcmenc.c.

Referenced by adpcm_encode_frame().

static uint8_t adpcm_ms_compress_sample	(	ADPCMChannelStatus *	c,
		int16_t	sample
	)

inlinestatic

Definition at line 221 of file adpcmenc.c.

Referenced by adpcm_encode_frame().

static uint8_t adpcm_yamaha_compress_sample	(	ADPCMChannelStatus *	c,
		int16_t	sample
	)

inlinestatic

Definition at line 250 of file adpcmenc.c.

Referenced by adpcm_encode_frame().

Variable Documentation

enum AVSampleFormat sample_fmts[]

static

Initial value:

= {
    AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_NONE
}

Definition at line 709 of file adpcmenc.c.

enum AVSampleFormat sample_fmts_p[]

static

Initial value:

= {
    AV_SAMPLE_FMT_S16P, AV_SAMPLE_FMT_NONE
}

Definition at line 713 of file adpcmenc.c.

Data Structures

Macros

Typedefs

Functions

Variables

Detailed Description

Macro Definition Documentation

Typedef Documentation

Function Documentation

Variable Documentation