dpcm.c File Reference

Assorted DPCM (differential pulse code modulation) audio codecs by Mike Melanson (melan.nosp@m.son@.nosp@m.pcisy.nosp@m.s.ne.nosp@m.t) Xan DPCM decoder by Mario Brito (mbrit.nosp@m.o@st.nosp@m.udent.nosp@m..dei.nosp@m..uc.p.nosp@m.t) for more information on the specific data formats, visit: http://www.pcisys.net/~melanson/codecs/simpleaudio.html SOL DPCMs implemented by Konstantin Shishkov. More...

#include "libavutil/intreadwrite.h"
#include "avcodec.h"
#include "bytestream.h"
#include "internal.h"
#include "mathops.h"

Classes
struct	DPCMContext

Macros
#define	DPCM_DECODER(id_, name_, long_name_)

Typedefs
typedef struct DPCMContext	DPCMContext

Functions
	DPCM_DECODER (AV_CODEC_ID_GREMLIN_DPCM, gremlin_dpcm, "DPCM Gremlin")
	DPCM_DECODER (AV_CODEC_ID_INTERPLAY_DPCM, interplay_dpcm, "DPCM Interplay")
	DPCM_DECODER (AV_CODEC_ID_ROQ_DPCM, roq_dpcm, "DPCM id RoQ")
	DPCM_DECODER (AV_CODEC_ID_SDX2_DPCM, sdx2_dpcm, "DPCM Squareroot-Delta-Exact")
	DPCM_DECODER (AV_CODEC_ID_SOL_DPCM, sol_dpcm, "DPCM Sol")
	DPCM_DECODER (AV_CODEC_ID_XAN_DPCM, xan_dpcm, "DPCM Xan")

Detailed Description

Assorted DPCM (differential pulse code modulation) audio codecs by Mike Melanson (melan.nosp@m.son@.nosp@m.pcisy.nosp@m.s.ne.nosp@m.t) Xan DPCM decoder by Mario Brito (mbrit.nosp@m.o@st.nosp@m.udent.nosp@m..dei.nosp@m..uc.p.nosp@m.t) for more information on the specific data formats, visit: http://www.pcisys.net/~melanson/codecs/simpleaudio.html SOL DPCMs implemented by Konstantin Shishkov.

Note about using the Xan DPCM decoder: Xan DPCM is used in AVI files found in the Wing Commander IV computer game. These AVI files contain WAVEFORMAT headers which report the audio format as 0x01: raw PCM. Clearly incorrect. To detect Xan DPCM, you will probably have to special-case your AVI demuxer to use Xan DPCM if the file uses 'Xxan' (Xan video) for its video codec. Alternately, such AVI files also contain the fourcc 'Axan' in the 'auds' chunk of the AVI header.

Macro Definition Documentation

DPCM_DECODER

#define DPCM_DECODER	(		id_,
			name_,
			long_name_
	)

Value:

AVCodec ff_ ## name_ ## _decoder = {                        \
    .name           = #name_,                               \
    .long_name      = NULL_IF_CONFIG_SMALL(long_name_),     \
    .type           = AVMEDIA_TYPE_AUDIO,                   \
    .id             = id_,                                  \
    .priv_data_size = sizeof(DPCMContext),                  \
    .init           = dpcm_decode_init,                     \
    .decode         = dpcm_decode_frame,                    \
    .capabilities   = AV_CODEC_CAP_DR1,                     \
}