adpcmenc.c File Reference

#include "avcodec.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_)

Functions
static av_cold int	adpcm_encode_close (AVCodecContext *avctx)
static av_cold int	adpcm_encode_init (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 See ADPCM decoder reference documents for codec information.

Definition in file adpcmenc.c.

Macro Definition Documentation

FREEZE_INTERVAL

#define FREEZE_INTERVAL   128

Definition at line 59 of file adpcmenc.c.

STORE_NODE

#define STORE_NODE	(		NAME,
			STEP_INDEX
	)

LOOP_NODES

#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);\
                }

ADPCM_ENCODER

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

Value:

AVCodec ff_ ## name_ ## _encoder = {                        \
    .name           = #name_,                               \
    .long_name      = NULL_IF_CONFIG_SMALL(long_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_,                         \
}

Definition at line 694 of file adpcmenc.c.

Function Documentation

adpcm_encode_close()

static av_cold int adpcm_encode_close ( AVCodecContext *  avctx )

static

Definition at line 153 of file adpcmenc.c.

Referenced by adpcm_encode_init().

adpcm_encode_init()

static av_cold int adpcm_encode_init ( AVCodecContext *  avctx )

static

Definition at line 63 of file adpcmenc.c.

adpcm_ima_compress_sample()

static uint8_t adpcm_ima_compress_sample ( ADPCMChannelStatus *  c, int16_t  sample  )

inlinestatic

Definition at line 165 of file adpcmenc.c.

adpcm_ima_qt_compress_sample()

static uint8_t adpcm_ima_qt_compress_sample ( ADPCMChannelStatus *  c, int16_t  sample  )

inlinestatic

Definition at line 178 of file adpcmenc.c.

adpcm_ms_compress_sample()

static uint8_t adpcm_ms_compress_sample ( ADPCMChannelStatus *  c, int16_t  sample  )

inlinestatic

Definition at line 215 of file adpcmenc.c.

adpcm_yamaha_compress_sample()

static uint8_t adpcm_yamaha_compress_sample ( ADPCMChannelStatus *  c, int16_t  sample  )

inlinestatic

Definition at line 244 of file adpcmenc.c.

adpcm_compress_trellis()

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

static

Definition at line 266 of file adpcmenc.c.

adpcm_encode_frame()

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

static

Definition at line 456 of file adpcmenc.c.

ADPCM_ENCODER() [1/5]

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

ADPCM_ENCODER() [2/5]

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

ADPCM_ENCODER() [3/5]

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

ADPCM_ENCODER() [4/5]

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

ADPCM_ENCODER() [5/5]

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

Variable Documentation

sample_fmts

enum AVSampleFormat sample_fmts[]

static

Initial value:

= {
    AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_NONE
}

Definition at line 686 of file adpcmenc.c.

Referenced by aeval_query_formats(), asink_query_formats(), configure_output_audio_filter(), lavfi_read_header(), new_audio_stream(), print_codec(), and query_formats().

sample_fmts_p

enum AVSampleFormat sample_fmts_p[]

static

Initial value:

= {
    AV_SAMPLE_FMT_S16P, AV_SAMPLE_FMT_NONE
}

Definition at line 690 of file adpcmenc.c.