ADPCM encoders First version by Francois Revol (revol@free.fr) Fringe ADPCM codecs (e.g., DK3, DK4, Westwood) by Mike Melanson (melanson@pcisys.net) More...
#include "avcodec.h"
#include "get_bits.h"
#include "put_bits.h"
#include "bytestream.h"
#include "adpcm.h"
#include "adpcm_data.h"
Go to the source code of this file.
Data Structures | |
struct | TrellisPath |
struct | TrellisNode |
struct | ADPCMEncodeContext |
Defines | |
#define | FREEZE_INTERVAL 128 |
#define | STORE_NODE(NAME, STEP_INDEX) |
#define | LOOP_NODES(NAME, STEP_TABLE, STEP_INDEX) |
#define | ADPCM_ENCODER(id_, name_, 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 unsigned char | adpcm_ima_compress_sample (ADPCMChannelStatus *c, short sample) |
static unsigned char | adpcm_ima_qt_compress_sample (ADPCMChannelStatus *c, short sample) |
static unsigned char | adpcm_ms_compress_sample (ADPCMChannelStatus *c, short sample) |
static unsigned char | adpcm_yamaha_compress_sample (ADPCMChannelStatus *c, short sample) |
static void | adpcm_compress_trellis (AVCodecContext *avctx, const short *samples, uint8_t *dst, ADPCMChannelStatus *c, int n) |
static int | adpcm_encode_frame (AVCodecContext *avctx, unsigned char *frame, int buf_size, void *data) |
ADPCM_ENCODER (CODEC_ID_ADPCM_IMA_QT, adpcm_ima_qt,"ADPCM IMA QuickTime") | |
ADPCM_ENCODER (CODEC_ID_ADPCM_IMA_WAV, adpcm_ima_wav,"ADPCM IMA WAV") | |
ADPCM_ENCODER (CODEC_ID_ADPCM_MS, adpcm_ms,"ADPCM Microsoft") | |
ADPCM_ENCODER (CODEC_ID_ADPCM_SWF, adpcm_swf,"ADPCM Shockwave Flash") | |
ADPCM_ENCODER (CODEC_ID_ADPCM_YAMAHA, adpcm_yamaha,"ADPCM Yamaha") |
ADPCM encoders First version by Francois Revol (revol@free.fr) Fringe ADPCM codecs (e.g., DK3, DK4, Westwood) by Mike Melanson (melanson@pcisys.net)
See ADPCM decoder reference documents for codec information.
Definition in file adpcmenc.c.
#define ADPCM_ENCODER | ( | id_, | |
name_, | |||
long_name_ | |||
) |
AVCodec ff_ ## name_ ## _encoder = { \ .name = #name_, \ .type = AVMEDIA_TYPE_AUDIO, \ .id = id_, \ .priv_data_size = sizeof(ADPCMEncodeContext), \ .init = adpcm_encode_init, \ .encode = adpcm_encode_frame, \ .close = adpcm_encode_close, \ .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16, \ AV_SAMPLE_FMT_NONE}, \ .long_name = NULL_IF_CONFIG_SMALL(long_name_), \ }
Definition at line 687 of file adpcmenc.c.
#define FREEZE_INTERVAL 128 |
Definition at line 59 of file adpcmenc.c.
Referenced by adpcm_compress_trellis(), and adpcm_encode_init().
#define LOOP_NODES | ( | NAME, | |
STEP_TABLE, | |||
STEP_INDEX | |||
) |
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(), and g722_encode_trellis().
typedef struct ADPCMEncodeContext ADPCMEncodeContext |
typedef struct TrellisNode TrellisNode |
typedef struct TrellisPath TrellisPath |
static void adpcm_compress_trellis | ( | AVCodecContext * | avctx, |
const short * | samples, | ||
uint8_t * | dst, | ||
ADPCMChannelStatus * | c, | ||
int | n | ||
) | [static] |
Definition at line 265 of file adpcmenc.c.
static av_cold int adpcm_encode_close | ( | AVCodecContext * | avctx | ) | [static] |
Definition at line 151 of file adpcmenc.c.
static int adpcm_encode_frame | ( | AVCodecContext * | avctx, |
unsigned char * | frame, | ||
int | buf_size, | ||
void * | data | ||
) | [static] |
Definition at line 455 of file adpcmenc.c.
static av_cold int adpcm_encode_init | ( | AVCodecContext * | avctx | ) | [static] |
Definition at line 61 of file adpcmenc.c.
ADPCM_ENCODER | ( | CODEC_ID_ADPCM_IMA_QT | , |
adpcm_ima_qt | , | ||
"ADPCM IMA QuickTime" | |||
) |
ADPCM_ENCODER | ( | CODEC_ID_ADPCM_IMA_WAV | , |
adpcm_ima_wav | , | ||
"ADPCM IMA WAV" | |||
) |
ADPCM_ENCODER | ( | CODEC_ID_ADPCM_MS | , |
adpcm_ms | , | ||
"ADPCM Microsoft" | |||
) |
ADPCM_ENCODER | ( | CODEC_ID_ADPCM_SWF | , |
adpcm_swf | , | ||
"ADPCM Shockwave Flash" | |||
) |
ADPCM_ENCODER | ( | CODEC_ID_ADPCM_YAMAHA | , |
adpcm_yamaha | , | ||
"ADPCM Yamaha" | |||
) |
static unsigned char adpcm_ima_compress_sample | ( | ADPCMChannelStatus * | c, |
short | sample | ||
) | [inline, static] |
Definition at line 164 of file adpcmenc.c.
static unsigned char adpcm_ima_qt_compress_sample | ( | ADPCMChannelStatus * | c, |
short | sample | ||
) | [inline, static] |
Definition at line 177 of file adpcmenc.c.
static unsigned char adpcm_ms_compress_sample | ( | ADPCMChannelStatus * | c, |
short | sample | ||
) | [inline, static] |
Definition at line 214 of file adpcmenc.c.
static unsigned char adpcm_yamaha_compress_sample | ( | ADPCMChannelStatus * | c, |
short | sample | ||
) | [inline, static] |
Definition at line 243 of file adpcmenc.c.