Data Structures | Macros | Typedefs | Functions | Variables
adpcm.c File Reference

ADPCM decoders 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) CD-ROM XA ADPCM codec by BERO EA ADPCM decoder by Robin Kay (komad.nosp@m.ori@.nosp@m.myrea.nosp@m.lbox.nosp@m..com) EA ADPCM R1/R2/R3 decoder by Peter Ross (pross.nosp@m.@xvi.nosp@m.d.org) EA IMA EACS decoder by Peter Ross (pross.nosp@m.@xvi.nosp@m.d.org) EA IMA SEAD decoder by Peter Ross (pross.nosp@m.@xvi.nosp@m.d.org) EA ADPCM XAS decoder by Peter Ross (pross.nosp@m.@xvi.nosp@m.d.org) MAXIS EA ADPCM decoder by Robert Marston (rmars.nosp@m.ton@.nosp@m.gmail.nosp@m..com) THP ADPCM decoder by Marco Gerards (mgera.nosp@m.rds@.nosp@m.xs4al.nosp@m.l.nl) More...

#include "avcodec.h"
#include "internal.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  ADPCMDecodeContext

Macros

#define DK3_GET_NEXT_NIBBLE()
#define ADPCM_DECODER(id_, name_, long_name_)

Typedefs

typedef struct ADPCMDecodeContext ADPCMDecodeContext

Functions

static av_cold int adpcm_decode_init (AVCodecContext *avctx)
static short adpcm_ima_expand_nibble (ADPCMChannelStatus *c, char nibble, int shift)
static int adpcm_ima_qt_expand_nibble (ADPCMChannelStatus *c, int nibble, int shift)
static short adpcm_ms_expand_nibble (ADPCMChannelStatus *c, char nibble)
static short adpcm_ct_expand_nibble (ADPCMChannelStatus *c, char nibble)
static short adpcm_sbpro_expand_nibble (ADPCMChannelStatus *c, char nibble, int size, int shift)
static short adpcm_yamaha_expand_nibble (ADPCMChannelStatus *c, unsigned char nibble)
static int xa_decode (AVCodecContext *avctx, short *out, const unsigned char *in, ADPCMChannelStatus *left, ADPCMChannelStatus *right, int inc)
static int get_nb_samples (AVCodecContext *avctx, const uint8_t *buf, int buf_size, int *coded_samples)
 Get the number of samples that will be decoded from the packet.
static int adpcm_decode_frame (AVCodecContext *avctx, void *data, int *got_frame_ptr, AVPacket *avpkt)
 ADPCM_DECODER (CODEC_ID_ADPCM_4XM, adpcm_4xm,"ADPCM 4X Movie")
 ADPCM_DECODER (CODEC_ID_ADPCM_CT, adpcm_ct,"ADPCM Creative Technology")
 ADPCM_DECODER (CODEC_ID_ADPCM_EA, adpcm_ea,"ADPCM Electronic Arts")
 ADPCM_DECODER (CODEC_ID_ADPCM_EA_MAXIS_XA, adpcm_ea_maxis_xa,"ADPCM Electronic Arts Maxis CDROM XA")
 ADPCM_DECODER (CODEC_ID_ADPCM_EA_R1, adpcm_ea_r1,"ADPCM Electronic Arts R1")
 ADPCM_DECODER (CODEC_ID_ADPCM_EA_R2, adpcm_ea_r2,"ADPCM Electronic Arts R2")
 ADPCM_DECODER (CODEC_ID_ADPCM_EA_R3, adpcm_ea_r3,"ADPCM Electronic Arts R3")
 ADPCM_DECODER (CODEC_ID_ADPCM_EA_XAS, adpcm_ea_xas,"ADPCM Electronic Arts XAS")
 ADPCM_DECODER (CODEC_ID_ADPCM_IMA_AMV, adpcm_ima_amv,"ADPCM IMA AMV")
 ADPCM_DECODER (CODEC_ID_ADPCM_IMA_DK3, adpcm_ima_dk3,"ADPCM IMA Duck DK3")
 ADPCM_DECODER (CODEC_ID_ADPCM_IMA_DK4, adpcm_ima_dk4,"ADPCM IMA Duck DK4")
 ADPCM_DECODER (CODEC_ID_ADPCM_IMA_EA_EACS, adpcm_ima_ea_eacs,"ADPCM IMA Electronic Arts EACS")
 ADPCM_DECODER (CODEC_ID_ADPCM_IMA_EA_SEAD, adpcm_ima_ea_sead,"ADPCM IMA Electronic Arts SEAD")
 ADPCM_DECODER (CODEC_ID_ADPCM_IMA_ISS, adpcm_ima_iss,"ADPCM IMA Funcom ISS")
 ADPCM_DECODER (CODEC_ID_ADPCM_IMA_QT, adpcm_ima_qt,"ADPCM IMA QuickTime")
 ADPCM_DECODER (CODEC_ID_ADPCM_IMA_SMJPEG, adpcm_ima_smjpeg,"ADPCM IMA Loki SDL MJPEG")
 ADPCM_DECODER (CODEC_ID_ADPCM_IMA_WAV, adpcm_ima_wav,"ADPCM IMA WAV")
 ADPCM_DECODER (CODEC_ID_ADPCM_IMA_WS, adpcm_ima_ws,"ADPCM IMA Westwood")
 ADPCM_DECODER (CODEC_ID_ADPCM_MS, adpcm_ms,"ADPCM Microsoft")
 ADPCM_DECODER (CODEC_ID_ADPCM_SBPRO_2, adpcm_sbpro_2,"ADPCM Sound Blaster Pro 2-bit")
 ADPCM_DECODER (CODEC_ID_ADPCM_SBPRO_3, adpcm_sbpro_3,"ADPCM Sound Blaster Pro 2.6-bit")
 ADPCM_DECODER (CODEC_ID_ADPCM_SBPRO_4, adpcm_sbpro_4,"ADPCM Sound Blaster Pro 4-bit")
 ADPCM_DECODER (CODEC_ID_ADPCM_SWF, adpcm_swf,"ADPCM Shockwave Flash")
 ADPCM_DECODER (CODEC_ID_ADPCM_THP, adpcm_thp,"ADPCM Nintendo Gamecube THP")
 ADPCM_DECODER (CODEC_ID_ADPCM_XA, adpcm_xa,"ADPCM CDROM XA")
 ADPCM_DECODER (CODEC_ID_ADPCM_YAMAHA, adpcm_yamaha,"ADPCM Yamaha")

Variables

static const int xa_adpcm_table [5][2]
static const int ea_adpcm_table []
static const int swf_index_tables [4][16]

Detailed Description

ADPCM decoders 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) CD-ROM XA ADPCM codec by BERO EA ADPCM decoder by Robin Kay (komad.nosp@m.ori@.nosp@m.myrea.nosp@m.lbox.nosp@m..com) EA ADPCM R1/R2/R3 decoder by Peter Ross (pross.nosp@m.@xvi.nosp@m.d.org) EA IMA EACS decoder by Peter Ross (pross.nosp@m.@xvi.nosp@m.d.org) EA IMA SEAD decoder by Peter Ross (pross.nosp@m.@xvi.nosp@m.d.org) EA ADPCM XAS decoder by Peter Ross (pross.nosp@m.@xvi.nosp@m.d.org) MAXIS EA ADPCM decoder by Robert Marston (rmars.nosp@m.ton@.nosp@m.gmail.nosp@m..com) THP ADPCM decoder by Marco Gerards (mgera.nosp@m.rds@.nosp@m.xs4al.nosp@m.l.nl)

Features and limitations:

Reference documents: http://wiki.multimedia.cx/index.php?title=Category:ADPCM_Audio_Codecs http://www.pcisys.net/~melanson/codecs/simpleaudio.html [dead] http://www.geocities.com/SiliconValley/8682/aud3.txt [dead] http://openquicktime.sourceforge.net/ XAnim sources (xa_codec.c) http://xanim.polter.net/ http://www.cs.ucla.edu/~leec/mediabench/applications.html [dead] SoX source code http://sox.sourceforge.net/

CD-ROM XA: http://ku-www.ss.titech.ac.jp/~yatsushi/xaadpcm.html [dead] vagpack & depack http://homepages.compuserve.de/bITmASTER32/psx-index.html [dead] readstr http://www.geocities.co.jp/Playtown/2004/

Definition in file adpcm.c.

Macro Definition Documentation

#define ADPCM_DECODER (   id_,
  name_,
  long_name_ 
)
Value:
AVCodec ff_ ## name_ ## _decoder = { \
.name = #name_, \
.type = AVMEDIA_TYPE_AUDIO, \
.id = id_, \
.priv_data_size = sizeof(ADPCMDecodeContext), \
.init = adpcm_decode_init, \
.decode = adpcm_decode_frame, \
.capabilities = CODEC_CAP_DR1, \
.long_name = NULL_IF_CONFIG_SMALL(long_name_), \
}

Definition at line 1217 of file adpcm.c.

#define DK3_GET_NEXT_NIBBLE ( )
Value:
if (decode_top_nibble_next) \
{ \
nibble = last_byte >> 4; \
decode_top_nibble_next = 0; \
} \
else \
{ \
if (end_of_packet) \
break; \
last_byte = *src++; \
if (src >= buf + buf_size) \
end_of_packet = 1; \
nibble = last_byte & 0x0F; \
decode_top_nibble_next = 1; \
}

Definition at line 512 of file adpcm.c.

Referenced by adpcm_decode_frame().

Typedef Documentation

typedef struct ADPCMDecodeContext ADPCMDecodeContext

Function Documentation

static short adpcm_ct_expand_nibble ( ADPCMChannelStatus *  c,
char  nibble 
)
inlinestatic

Definition at line 209 of file adpcm.c.

Referenced by adpcm_decode_frame().

static int adpcm_decode_frame ( AVCodecContext *  avctx,
void *  data,
int *  got_frame_ptr,
AVPacket *  avpkt 
)
static

Definition at line 529 of file adpcm.c.

static av_cold int adpcm_decode_init ( AVCodecContext *  avctx)
static

Definition at line 92 of file adpcm.c.

ADPCM_DECODER ( CODEC_ID_ADPCM_4XM  ,
adpcm_4xm  ,
"ADPCM 4X Movie"   
)
ADPCM_DECODER ( CODEC_ID_ADPCM_CT  ,
adpcm_ct  ,
"ADPCM Creative Technology"   
)
ADPCM_DECODER ( CODEC_ID_ADPCM_EA  ,
adpcm_ea  ,
"ADPCM Electronic Arts"   
)
ADPCM_DECODER ( CODEC_ID_ADPCM_EA_MAXIS_XA  ,
adpcm_ea_maxis_xa  ,
"ADPCM Electronic Arts Maxis CDROM XA"   
)
ADPCM_DECODER ( CODEC_ID_ADPCM_EA_R1  ,
adpcm_ea_r1  ,
"ADPCM Electronic Arts R1"   
)
ADPCM_DECODER ( CODEC_ID_ADPCM_EA_R2  ,
adpcm_ea_r2  ,
"ADPCM Electronic Arts R2"   
)
ADPCM_DECODER ( CODEC_ID_ADPCM_EA_R3  ,
adpcm_ea_r3  ,
"ADPCM Electronic Arts R3"   
)
ADPCM_DECODER ( CODEC_ID_ADPCM_EA_XAS  ,
adpcm_ea_xas  ,
"ADPCM Electronic Arts XAS"   
)
ADPCM_DECODER ( CODEC_ID_ADPCM_IMA_AMV  ,
adpcm_ima_amv  ,
"ADPCM IMA AMV"   
)
ADPCM_DECODER ( CODEC_ID_ADPCM_IMA_DK3  ,
adpcm_ima_dk3  ,
"ADPCM IMA Duck DK3"   
)
ADPCM_DECODER ( CODEC_ID_ADPCM_IMA_DK4  ,
adpcm_ima_dk4  ,
"ADPCM IMA Duck DK4"   
)
ADPCM_DECODER ( CODEC_ID_ADPCM_IMA_EA_EACS  ,
adpcm_ima_ea_eacs  ,
"ADPCM IMA Electronic Arts EACS"   
)
ADPCM_DECODER ( CODEC_ID_ADPCM_IMA_EA_SEAD  ,
adpcm_ima_ea_sead  ,
"ADPCM IMA Electronic Arts SEAD"   
)
ADPCM_DECODER ( CODEC_ID_ADPCM_IMA_ISS  ,
adpcm_ima_iss  ,
"ADPCM IMA Funcom ISS"   
)
ADPCM_DECODER ( CODEC_ID_ADPCM_IMA_QT  ,
adpcm_ima_qt  ,
"ADPCM IMA QuickTime"   
)
ADPCM_DECODER ( CODEC_ID_ADPCM_IMA_SMJPEG  ,
adpcm_ima_smjpeg  ,
"ADPCM IMA Loki SDL MJPEG"   
)
ADPCM_DECODER ( CODEC_ID_ADPCM_IMA_WAV  ,
adpcm_ima_wav  ,
"ADPCM IMA WAV"   
)
ADPCM_DECODER ( CODEC_ID_ADPCM_IMA_WS  ,
adpcm_ima_ws  ,
"ADPCM IMA Westwood"   
)
ADPCM_DECODER ( CODEC_ID_ADPCM_MS  ,
adpcm_ms  ,
"ADPCM Microsoft"   
)
ADPCM_DECODER ( CODEC_ID_ADPCM_SBPRO_2  ,
adpcm_sbpro_2  ,
"ADPCM Sound Blaster Pro 2-bit"   
)
ADPCM_DECODER ( CODEC_ID_ADPCM_SBPRO_3  ,
adpcm_sbpro_3  ,
"ADPCM Sound Blaster Pro 2.6-bit"   
)
ADPCM_DECODER ( CODEC_ID_ADPCM_SBPRO_4  ,
adpcm_sbpro_4  ,
"ADPCM Sound Blaster Pro 4-bit"   
)
ADPCM_DECODER ( CODEC_ID_ADPCM_SWF  ,
adpcm_swf  ,
"ADPCM Shockwave Flash"   
)
ADPCM_DECODER ( CODEC_ID_ADPCM_THP  ,
adpcm_thp  ,
"ADPCM Nintendo Gamecube THP"   
)
ADPCM_DECODER ( CODEC_ID_ADPCM_XA  ,
adpcm_xa  ,
"ADPCM CDROM XA"   
)
ADPCM_DECODER ( CODEC_ID_ADPCM_YAMAHA  ,
adpcm_yamaha  ,
"ADPCM Yamaha"   
)
static short adpcm_ima_expand_nibble ( ADPCMChannelStatus *  c,
char  nibble,
int  shift 
)
inlinestatic

Definition at line 141 of file adpcm.c.

Referenced by adpcm_decode_frame().

static int adpcm_ima_qt_expand_nibble ( ADPCMChannelStatus *  c,
int  nibble,
int  shift 
)
inlinestatic

Definition at line 168 of file adpcm.c.

Referenced by adpcm_decode_frame().

static short adpcm_ms_expand_nibble ( ADPCMChannelStatus *  c,
char  nibble 
)
inlinestatic

Definition at line 194 of file adpcm.c.

Referenced by adpcm_decode_frame().

static short adpcm_sbpro_expand_nibble ( ADPCMChannelStatus *  c,
char  nibble,
int  size,
int  shift 
)
inlinestatic

Definition at line 230 of file adpcm.c.

Referenced by adpcm_decode_frame().

static short adpcm_yamaha_expand_nibble ( ADPCMChannelStatus *  c,
unsigned char  nibble 
)
inlinestatic

Definition at line 250 of file adpcm.c.

Referenced by adpcm_decode_frame().

static int get_nb_samples ( AVCodecContext *  avctx,
const uint8_t *  buf,
int  buf_size,
int *  coded_samples 
)
static

Get the number of samples that will be decoded from the packet.

In one case, this is actually the maximum number of samples possible to decode with the given buf_size.

Parameters
[out]coded_samplesset to the number of samples as coded in the packet, or 0 if the codec does not encode the number of samples in each frame.

Definition at line 352 of file adpcm.c.

Referenced by adpcm_decode_frame().

static int xa_decode ( AVCodecContext *  avctx,
short *  out,
const unsigned char *  in,
ADPCMChannelStatus *  left,
ADPCMChannelStatus *  right,
int  inc 
)
static

Definition at line 264 of file adpcm.c.

Referenced by adpcm_decode_frame().

Variable Documentation

const int ea_adpcm_table[]
static
Initial value:
{
0, 240, 460, 392,
0, 0, -208, -220,
0, 1, 3, 4,
7, 8, 10, 11,
0, -1, -3, -4
}

Definition at line 69 of file adpcm.c.

Referenced by adpcm_decode_frame().

const int swf_index_tables[4][16]
static
Initial value:
{
{ -1, 2 },
{ -1, -1, 2, 4 },
{ -1, -1, -1, -1, 2, 4, 6, 8 },
{ -1, -1, -1, -1, -1, -1, -1, -1, 1, 2, 4, 6, 8, 10, 13, 16 }
}

Definition at line 78 of file adpcm.c.

Referenced by adpcm_decode_frame().

const int xa_adpcm_table[5][2]
static
Initial value:
{
{ 0, 0 },
{ 60, 0 },
{ 115, -52 },
{ 98, -55 },
{ 122, -60 }
}

Definition at line 61 of file adpcm.c.

Referenced by xa_decode().