adpcm.c File Reference

#include "avcodec.h"
#include "get_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	ADPCMDecodeContext

Macros
#define	CASE_0(codec_id, ...)
#define	CASE_1(codec_id, ...)
#define	CASE_2(enabled, codec_id, ...)   CASE_ ## enabled(codec_id, __VA_ARGS__)
#define	CASE_3(config, codec_id, ...)   CASE_2(config, codec_id, __VA_ARGS__)
#define	CASE(codec, ...)   CASE_3(CONFIG_ ## codec ## _DECODER, AV_CODEC_ID_ ## codec, __VA_ARGS__)
#define	DK3_GET_NEXT_NIBBLE()
#define	ADPCM_DECODER_0(id_, sample_fmts_, name_, long_name_)
#define	ADPCM_DECODER_1(id_, sample_fmts_, name_, long_name_)
#define	ADPCM_DECODER_2(enabled, codec_id, name, sample_fmts, long_name)   ADPCM_DECODER_ ## enabled(codec_id, name, sample_fmts, long_name)
#define	ADPCM_DECODER_3(config, codec_id, name, sample_fmts, long_name)   ADPCM_DECODER_2(config, codec_id, name, sample_fmts, long_name)
#define	ADPCM_DECODER(codec, name, sample_fmts, long_name)

Functions
static void	adpcm_flush (AVCodecContext *avctx)
static av_cold int	adpcm_decode_init (AVCodecContext *avctx)
static int16_t	adpcm_agm_expand_nibble (ADPCMChannelStatus *c, int8_t nibble)
static int16_t	adpcm_ima_expand_nibble (ADPCMChannelStatus *c, int8_t nibble, int shift)
static int16_t	adpcm_ima_alp_expand_nibble (ADPCMChannelStatus *c, int8_t nibble, int shift)
static int16_t	adpcm_ima_mtf_expand_nibble (ADPCMChannelStatus *c, int nibble)
static int16_t	adpcm_ima_cunning_expand_nibble (ADPCMChannelStatus *c, int8_t nibble)
static int16_t	adpcm_ima_wav_expand_nibble (ADPCMChannelStatus *c, GetBitContext *gb, int bps)
static int	adpcm_ima_qt_expand_nibble (ADPCMChannelStatus *c, int nibble)
static int16_t	adpcm_ms_expand_nibble (ADPCMChannelStatus *c, int nibble)
static int16_t	adpcm_ima_oki_expand_nibble (ADPCMChannelStatus *c, int nibble)
static int16_t	adpcm_ct_expand_nibble (ADPCMChannelStatus *c, int8_t nibble)
static int16_t	adpcm_sbpro_expand_nibble (ADPCMChannelStatus *c, int8_t nibble, int size, int shift)
static int16_t	adpcm_yamaha_expand_nibble (ADPCMChannelStatus *c, uint8_t nibble)
static int16_t	adpcm_mtaf_expand_nibble (ADPCMChannelStatus *c, uint8_t nibble)
static int16_t	adpcm_zork_expand_nibble (ADPCMChannelStatus *c, uint8_t nibble)
static int	xa_decode (AVCodecContext *avctx, int16_t *out0, int16_t *out1, const uint8_t *in, ADPCMChannelStatus *left, ADPCMChannelStatus *right, int channels, int sample_offset)
static void	adpcm_swf_decode (AVCodecContext *avctx, const uint8_t *buf, int buf_size, int16_t *samples)
int16_t	ff_adpcm_argo_expand_nibble (ADPCMChannelStatus *cs, int nibble, int shift, int flag)
static int	get_nb_samples (AVCodecContext *avctx, GetByteContext *gb, int buf_size, int *coded_samples, int *approx_nb_samples)
	Get the number of samples (per channel) that will be decoded from the packet. More...
static int	adpcm_decode_frame (AVCodecContext *avctx, void *data, int *got_frame_ptr, AVPacket *avpkt)

Variables
static const int8_t	xa_adpcm_table [5][2]
static const int16_t	afc_coeffs [2][16]
static const int16_t	ea_adpcm_table []
static const int8_t	ima_cunning_index_table [9]
static const int16_t	ima_cunning_step_table [61]
static const int8_t	adpcm_index_table2 [4]
static const int8_t	adpcm_index_table3 [8]
static const int8_t	adpcm_index_table5 [32]
static const int8_t *const	adpcm_index_tables [4]
static const int16_t	mtaf_stepsize [32][16]
static const int16_t	oki_step_table [49]
static const int8_t	swf_index_tables [4][16]
static const int8_t	zork_index_table [8]
static const int8_t	mtf_index_table [16]
static enum AVSampleFormat	sample_fmts_s16 []
static enum AVSampleFormat	sample_fmts_s16p []
static enum AVSampleFormat	sample_fmts_both []

Detailed Description

ADPCM decoders 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

CASE_0

#define CASE_0	(		codec_id,
			...
	)

Definition at line 64 of file adpcm.c.

CASE_1

#define CASE_1	(		codec_id,
			...
	)

Value:

    case codec_id:            \
    { __VA_ARGS__ }           \
    break;

Definition at line 65 of file adpcm.c.

CASE_2

#define CASE_2	(		enabled,
			codec_id,
			...
	)		CASE_ ## enabled(codec_id, __VA_ARGS__)

Definition at line 69 of file adpcm.c.

CASE_3

#define CASE_3	(		config,
			codec_id,
			...
	)		CASE_2(config, codec_id, __VA_ARGS__)

Definition at line 71 of file adpcm.c.

CASE

#define CASE	(		codec,
			...
	)		CASE_3(CONFIG_ ## codec ## _DECODER, AV_CODEC_ID_ ## codec, __VA_ARGS__)

Definition at line 73 of file adpcm.c.

DK3_GET_NEXT_NIBBLE

#define DK3_GET_NEXT_NIBBLE

(

)

Value:

    if (decode_top_nibble_next) { \
        nibble = last_byte >> 4; \
        decode_top_nibble_next = 0; \
    } else { \
        last_byte = bytestream2_get_byteu(&gb); \
        nibble = last_byte & 0x0F; \
        decode_top_nibble_next = 1; \
    }

ADPCM_DECODER_0

#define ADPCM_DECODER_0	(		id_,
			sample_fmts_,
			name_,
			long_name_
	)

Definition at line 2278 of file adpcm.c.

ADPCM_DECODER_1

#define ADPCM_DECODER_1	(		id_,
			sample_fmts_,
			name_,
			long_name_
	)

Value:

const AVCodec ff_ ## name_ ## _decoder = {                  \
    .name           = #name_,                               \
    .long_name      = NULL_IF_CONFIG_SMALL(long_name_),     \
    .type           = AVMEDIA_TYPE_AUDIO,                   \
    .id             = id_,                                  \
    .priv_data_size = sizeof(ADPCMDecodeContext),           \
    .init           = adpcm_decode_init,                    \
    .decode         = adpcm_decode_frame,                   \
    .flush          = adpcm_flush,                          \
    .capabilities   = AV_CODEC_CAP_DR1,                     \
    .sample_fmts    = sample_fmts_,                         \
    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,         \
};

Definition at line 2279 of file adpcm.c.

ADPCM_DECODER_2

#define ADPCM_DECODER_2	(		enabled,
			codec_id,
			name,
			sample_fmts,
			long_name
	)		ADPCM_DECODER_ ## enabled(codec_id, name, sample_fmts, long_name)

Definition at line 2293 of file adpcm.c.

ADPCM_DECODER_3

#define ADPCM_DECODER_3	(		config,
			codec_id,
			name,
			sample_fmts,
			long_name
	)		ADPCM_DECODER_2(config, codec_id, name, sample_fmts, long_name)

Definition at line 2295 of file adpcm.c.

ADPCM_DECODER

#define ADPCM_DECODER	(		codec,
			name,
			sample_fmts,
			long_name
	)

Value:

    ADPCM_DECODER_3(CONFIG_ ## codec ## _DECODER, AV_CODEC_ID_ ## codec, \
                    name, sample_fmts, long_name)

Definition at line 2297 of file adpcm.c.

Function Documentation

adpcm_flush()

static void adpcm_flush ( AVCodecContext *  avctx )

static

Definition at line 2228 of file adpcm.c.

Referenced by adpcm_decode_init().

adpcm_decode_init()

static av_cold int adpcm_decode_init ( AVCodecContext *  avctx )

static

Definition at line 247 of file adpcm.c.

adpcm_agm_expand_nibble()

static int16_t adpcm_agm_expand_nibble ( ADPCMChannelStatus *  c, int8_t  nibble  )

inlinestatic

Definition at line 348 of file adpcm.c.

Referenced by adpcm_decode_frame().

adpcm_ima_expand_nibble()

static int16_t adpcm_ima_expand_nibble ( ADPCMChannelStatus *  c, int8_t  nibble, int  shift  )

inlinestatic

Definition at line 392 of file adpcm.c.

Referenced by adpcm_decode_frame().

adpcm_ima_alp_expand_nibble()

static int16_t adpcm_ima_alp_expand_nibble ( ADPCMChannelStatus *  c, int8_t  nibble, int  shift  )

inlinestatic

Definition at line 418 of file adpcm.c.

Referenced by adpcm_decode_frame().

adpcm_ima_mtf_expand_nibble()

static int16_t adpcm_ima_mtf_expand_nibble ( ADPCMChannelStatus *  c, int  nibble  )

inlinestatic

Definition at line 441 of file adpcm.c.

Referenced by adpcm_decode_frame().

adpcm_ima_cunning_expand_nibble()

static int16_t adpcm_ima_cunning_expand_nibble ( ADPCMChannelStatus *  c, int8_t  nibble  )

inlinestatic

Definition at line 457 of file adpcm.c.

Referenced by adpcm_decode_frame().

adpcm_ima_wav_expand_nibble()

static int16_t adpcm_ima_wav_expand_nibble ( ADPCMChannelStatus *  c, GetBitContext *  gb, int  bps  )

inlinestatic

Definition at line 477 of file adpcm.c.

Referenced by adpcm_decode_frame().

adpcm_ima_qt_expand_nibble()

static int adpcm_ima_qt_expand_nibble ( ADPCMChannelStatus *  c, int  nibble  )

inlinestatic

Definition at line 500 of file adpcm.c.

Referenced by adpcm_decode_frame().

adpcm_ms_expand_nibble()

static int16_t adpcm_ms_expand_nibble ( ADPCMChannelStatus *  c, int  nibble  )

inlinestatic

Definition at line 526 of file adpcm.c.

Referenced by adpcm_decode_frame().

adpcm_ima_oki_expand_nibble()

static int16_t adpcm_ima_oki_expand_nibble ( ADPCMChannelStatus *  c, int  nibble  )

inlinestatic

Definition at line 545 of file adpcm.c.

Referenced by adpcm_decode_frame().

adpcm_ct_expand_nibble()

static int16_t adpcm_ct_expand_nibble ( ADPCMChannelStatus *  c, int8_t  nibble  )

inlinestatic

Definition at line 566 of file adpcm.c.

Referenced by adpcm_decode_frame().

adpcm_sbpro_expand_nibble()

static int16_t adpcm_sbpro_expand_nibble ( ADPCMChannelStatus *  c, int8_t  nibble, int  size, int  shift  )

inlinestatic

Definition at line 587 of file adpcm.c.

Referenced by adpcm_decode_frame().

adpcm_yamaha_expand_nibble()

static int16_t adpcm_yamaha_expand_nibble ( ADPCMChannelStatus *  c, uint8_t  nibble  )

inlinestatic

Definition at line 607 of file adpcm.c.

Referenced by adpcm_decode_frame().

adpcm_mtaf_expand_nibble()

static int16_t adpcm_mtaf_expand_nibble ( ADPCMChannelStatus *  c, uint8_t  nibble  )

inlinestatic

Definition at line 621 of file adpcm.c.

Referenced by adpcm_decode_frame().

adpcm_zork_expand_nibble()

static int16_t adpcm_zork_expand_nibble ( ADPCMChannelStatus *  c, uint8_t  nibble  )

inlinestatic

Definition at line 630 of file adpcm.c.

Referenced by adpcm_decode_frame().

xa_decode()

static int xa_decode ( AVCodecContext *  avctx, int16_t *  out0, int16_t *  out1, const uint8_t *  in, ADPCMChannelStatus *  left, ADPCMChannelStatus *  right, int  channels, int  sample_offset  )

static

Definition at line 665 of file adpcm.c.

Referenced by adpcm_decode_frame().

adpcm_swf_decode()

static void adpcm_swf_decode ( AVCodecContext *  avctx, const uint8_t *  buf, int  buf_size, int16_t *  samples  )

static

Definition at line 753 of file adpcm.c.

Referenced by adpcm_decode_frame().

ff_adpcm_argo_expand_nibble()

int16_t ff_adpcm_argo_expand_nibble	(	ADPCMChannelStatus *	cs,
		int	nibble,
		int	shift,
		int	flag
	)

Definition at line 810 of file adpcm.c.

Referenced by adpcm_decode_frame(), and adpcm_encode_frame().

get_nb_samples()

static int get_nb_samples ( AVCodecContext *  avctx, GetByteContext *  gb, int  buf_size, int *  coded_samples, int *  approx_nb_samples  )

static

Get the number of samples (per channel) 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_samples	set 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.
[out]	approx_nb_samples	set to non-zero if the number of samples returned is an approximation.

Definition at line 838 of file adpcm.c.

Referenced by adpcm_decode_frame().

adpcm_decode_frame()

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

static

Definition at line 1057 of file adpcm.c.

Variable Documentation

xa_adpcm_table

const int8_t xa_adpcm_table[5][2]

static

Initial value:

= {
    {   0,   0 },
    {  60,   0 },
    { 115, -52 },
    {  98, -55 },
    { 122, -60 }
}

Definition at line 77 of file adpcm.c.

Referenced by adpcm_decode_frame(), and xa_decode().

afc_coeffs

const int16_t afc_coeffs[2][16]

static

Initial value:

= {
    { 0, 2048, 0, 1024, 4096, 3584, 3072, 4608, 4200, 4800, 5120, 2048, 1024, -1024, -1024, -2048 },
    { 0, 0, 2048, 1024, -2048, -1536, -1024, -2560, -2248, -2300, -3072, -2048, -1024, 1024, 0, 0 }
}

Definition at line 85 of file adpcm.c.

Referenced by adpcm_decode_frame().

ea_adpcm_table

const int16_t 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 90 of file adpcm.c.

Referenced by adpcm_decode_frame().

ima_cunning_index_table

const int8_t ima_cunning_index_table[9]

static

Initial value:

= {
    -1, -1, -1, -1, 1, 2, 3, 4, -1
}

Definition at line 104 of file adpcm.c.

Referenced by adpcm_ima_cunning_expand_nibble().

ima_cunning_step_table

const int16_t ima_cunning_step_table[61]

static

Initial value:

= {
       1,    1,   1,      1,     2,     2,     3,     3,    4,      5,
       6,    7,   8,     10,    12,    14,    16,    20,    24,    28,
      32,   40,  48,     56,    64,    80,    96,   112,   128,   160,
     192,  224,  256,   320,   384,   448,   512,   640,   768,   896,
    1024, 1280, 1536,  1792,  2048,  2560,  3072,  3584,  4096,  5120,
    6144, 7168, 8192, 10240, 12288, 14336, 16384, 20480, 24576, 28672, 0
}

Definition at line 114 of file adpcm.c.

Referenced by adpcm_ima_cunning_expand_nibble().

adpcm_index_table2

const int8_t adpcm_index_table2[4]

static

Initial value:

= {
    -1,  2,
    -1,  2,
}

Definition at line 123 of file adpcm.c.

adpcm_index_table3

const int8_t adpcm_index_table3[8]

static

Initial value:

= {
    -1, -1,  1,  2,
    -1, -1,  1,  2,
}

Definition at line 128 of file adpcm.c.

adpcm_index_table5

const int8_t adpcm_index_table5[32]

static

Initial value:

= {
    -1, -1, -1, -1, -1, -1, -1, -1, 1, 2, 4, 6, 8, 10, 13, 16,
    -1, -1, -1, -1, -1, -1, -1, -1, 1, 2, 4, 6, 8, 10, 13, 16,
}

Definition at line 133 of file adpcm.c.

adpcm_index_tables

const int8_t* const adpcm_index_tables[4]

static

Initial value:

= {
    &adpcm_index_table2[0],
    &adpcm_index_table3[0],
    &ff_adpcm_index_table[0],
    &adpcm_index_table5[0],
}

Definition at line 138 of file adpcm.c.

Referenced by adpcm_ima_wav_expand_nibble().

mtaf_stepsize

const int16_t mtaf_stepsize[32][16]

static

Definition at line 145 of file adpcm.c.

Referenced by adpcm_mtaf_expand_nibble().

oki_step_table

const int16_t oki_step_table[49]

static

Initial value:

= {
     16,  17,  19,  21,   23,   25,   28,   31,   34,  37,
     41,  45,  50,  55,   60,   66,   73,   80,   88,  97,
    107, 118, 130, 143,  157,  173,  190,  209,  230, 253,
    279, 307, 337, 371,  408,  449,  494,  544,  598, 658,
    724, 796, 876, 963, 1060, 1166, 1282, 1411, 1552
}

Definition at line 212 of file adpcm.c.

Referenced by adpcm_ima_oki_expand_nibble().

swf_index_tables

const int8_t 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 221 of file adpcm.c.

Referenced by adpcm_swf_decode().

zork_index_table

const int8_t zork_index_table[8]

static

Initial value:

= {
    -1, -1, -1, 1, 4, 7, 10, 12,
}

Definition at line 228 of file adpcm.c.

Referenced by adpcm_zork_expand_nibble().

mtf_index_table

const int8_t mtf_index_table[16]

static

Initial value:

= {
     8,  6,  4,  2, -1, -1, -1, -1,
    -1, -1, -1, -1,  2,  4,  6,  8,
}

Definition at line 232 of file adpcm.c.

Referenced by adpcm_ima_mtf_expand_nibble().

sample_fmts_s16

enum AVSampleFormat sample_fmts_s16[]

static

Initial value:

= { AV_SAMPLE_FMT_S16,
                                                        AV_SAMPLE_FMT_NONE }

Definition at line 2270 of file adpcm.c.

sample_fmts_s16p

enum AVSampleFormat sample_fmts_s16p[]

static

Initial value:

= { AV_SAMPLE_FMT_S16P,
                                                        AV_SAMPLE_FMT_NONE }

Definition at line 2272 of file adpcm.c.

sample_fmts_both

enum AVSampleFormat sample_fmts_both[]

static

Initial value:

= { AV_SAMPLE_FMT_S16,
                                                        AV_SAMPLE_FMT_S16P,
                                                        AV_SAMPLE_FMT_NONE }

Definition at line 2274 of file adpcm.c.