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DXA demuxer and decoder 

Originally committed as revision 8405 to svn://svn.ffmpeg.org/ffmpeg/trunk
tags/v0.5
Kostya Shishkov 19 years ago
parent
0769498a9f
commit
33a0dd378a
13 changed files with 566 additions and 4 deletions
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  1. +1
    -0
      Changelog
  2. +2
    -0
      MAINTAINERS
  3. +1
    -0
      configure
  4. +4
    -0
      doc/ffmpeg-doc.texi
  5. +1
    -0
      libavcodec/Makefile
  6. +1
    -0
      libavcodec/allcodecs.c
  7. +4
    -2
      libavcodec/avcodec.h
  8. +333
    -0
      libavcodec/dxa.c
  9. +1
    -0
      libavformat/Makefile
  10. +1
    -0
      libavformat/allformats.c
  11. +1
    -0
      libavformat/allformats.h
  12. +2
    -2
      libavformat/avformat.h
  13. +214
    -0
      libavformat/dxa.c

+ 1
- 0
Changelog View File

@@ -73,6 +73,7 @@ version <next>
- WMA encoder
- GSM-MS encoder and decoder
- DCA decoder
- DXA demuxer and decoder

version 0.4.9-pre1:



+ 2
- 0
MAINTAINERS View File

@@ -114,6 +114,7 @@ Codecs:
cook.c, cookdata.h Benjamin Larsson
cscd.c Reimar Doeffinger
dpcm.c Mike Melanson
dxa.c Kostya Shishkov
dv.c Roman Shaposhnik
ffv1.c Michael Niedermayer
flac.c Alex Beregszaszi
@@ -202,6 +203,7 @@ Muxers/Demuxers:
crc.c Michael Niedermayer
daud.c Reimar Doeffinger
dc1394.c, dv.c Roman Shaposhnik
dxa.c Kostya Shishkov
flic.c Mike Melanson
flvdec.c, flvenc.c Michael Niedermayer
gxf.c Reimar Doeffinger


+ 1
- 0
configure View File

@@ -644,6 +644,7 @@ CMDLINE_SELECT="
static
"

dxa_decoder_deps="zlib"
flashsv_decoder_deps="zlib"
flashsv_encoder_deps="zlib"
mpeg_xvmc_decoder_deps="xvmc"


+ 4
- 0
doc/ffmpeg-doc.texi View File

@@ -898,6 +898,9 @@ library:
@tab Material eXchange Format SMPTE 377M, used by D-Cinema, broadcast industry.
@item SEQ @tab @tab X
@tab Tiertex .seq files used in the DOS CDROM version of the game Flashback.
@item DXA @tab @tab X
@tab This format is used in non-Windows version of Feeble Files game and
different game cutscenes repacked for use with ScummVM.
@end multitable

@code{X} means that encoding (resp. decoding) is supported.
@@ -1005,6 +1008,7 @@ following image formats are supported:
@item VMware Video @tab @tab X @tab Codec used in videos captured by VMware.
@item Cin Video @tab @tab X @tab Codec used in Delphine Software games.
@item Tiertex Seq Video @tab @tab X @tab Codec used in DOS CDROM FlashBack game.
@item DXA Video @tab @tab X @tab Codec originally used in Feeble Files game.
@end multitable

@code{X} means that encoding (resp. decoding) is supported.


+ 1
- 0
libavcodec/Makefile View File

@@ -72,6 +72,7 @@ OBJS-$(CONFIG_DVDSUB_DECODER) += dvdsubdec.o
OBJS-$(CONFIG_DVDSUB_ENCODER) += dvdsubenc.o
OBJS-$(CONFIG_DVVIDEO_DECODER) += dv.o
OBJS-$(CONFIG_DVVIDEO_ENCODER) += dv.o
OBJS-$(CONFIG_DXA_DECODER) += dxa.o
OBJS-$(CONFIG_EIGHTBPS_DECODER) += 8bps.o
OBJS-$(CONFIG_FFV1_DECODER) += ffv1.o
OBJS-$(CONFIG_FFV1_ENCODER) += ffv1.o


+ 1
- 0
libavcodec/allcodecs.c View File

@@ -67,6 +67,7 @@ void avcodec_register_all(void)
REGISTER_DECODER(DCA, dca);
REGISTER_DECODER(DSICINVIDEO, dsicinvideo);
REGISTER_ENCDEC (DVVIDEO, dvvideo);
REGISTER_DECODER(DXA, dxa);
REGISTER_DECODER(EIGHTBPS, eightbps);
REGISTER_ENCDEC (FFV1, ffv1);
REGISTER_ENCDEC (FFVHUFF, ffvhuff);


+ 4
- 2
libavcodec/avcodec.h View File

@@ -37,8 +37,8 @@ extern "C" {
#define AV_STRINGIFY(s) AV_TOSTRING(s)
#define AV_TOSTRING(s) #s

#define LIBAVCODEC_VERSION_INT ((51<<16)+(38<<8)+0)
#define LIBAVCODEC_VERSION 51.38.0
#define LIBAVCODEC_VERSION_INT ((51<<16)+(39<<8)+0)
#define LIBAVCODEC_VERSION 51.39.0
#define LIBAVCODEC_BUILD LIBAVCODEC_VERSION_INT

#define LIBAVCODEC_IDENT "Lavc" AV_STRINGIFY(LIBAVCODEC_VERSION)
@@ -150,6 +150,7 @@ enum CodecID {
CODEC_ID_TIFF,
CODEC_ID_GIF,
CODEC_ID_FFH264,
CODEC_ID_DXA,

/* various pcm "codecs" */
CODEC_ID_PCM_S16LE= 0x10000,
@@ -2232,6 +2233,7 @@ extern AVCodec dca_decoder;
extern AVCodec dsicinaudio_decoder;
extern AVCodec dsicinvideo_decoder;
extern AVCodec dvvideo_decoder;
extern AVCodec dxa_decoder;
extern AVCodec eightbps_decoder;
extern AVCodec ffv1_decoder;
extern AVCodec ffvhuff_decoder;


+ 333
- 0
libavcodec/dxa.c View File

@@ -0,0 +1,333 @@
/*
* Feeble Files/ScummVM DXA decoder
* Copyright (c) 2007 Konstantin Shishkov
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
*/

/**
* @file dxa.c
* DXA Video decoder
*/

#include <stdio.h>
#include <stdlib.h>

#include "common.h"
#include "avcodec.h"

#include <zlib.h>

/*
* Decoder context
*/
typedef struct DxaDecContext {
AVCodecContext *avctx;
AVFrame pic, prev;

int dsize;
uint8_t *decomp_buf;
uint32_t pal[256];
} DxaDecContext;

static const int shift1[6] = { 0, 8, 8, 8, 4, 4 };
static const int shift2[6] = { 0, 0, 8, 4, 0, 4 };

static int decode_13(AVCodecContext *avctx, DxaDecContext *c, uint8_t* dst, uint8_t *src, uint8_t *ref)
{
uint8_t *code, *data, *mv, *msk, *tmp, *tmp2;
int i, j, k;
int type, x, y, d, d2;
int stride = c->pic.linesize[0];
uint32_t mask;

code = src + 12;
data = code + ((avctx->width * avctx->height) >> 4);
mv = data + AV_RB32(src + 0);
msk = mv + AV_RB32(src + 4);

for(j = 0; j < avctx->height; j += 4){
for(i = 0; i < avctx->width; i += 4){
tmp = dst + i;
tmp2 = ref + i;
type = *code++;
switch(type){
case 4: // motion compensation
x = (*mv) >> 4; if(x & 8) x = 8 - x;
y = (*mv++) & 0xF; if(y & 8) y = 8 - y;
tmp2 += x + y*stride;
case 0: // skip
case 5: // skip in method 12
for(y = 0; y < 4; y++){
memcpy(tmp, tmp2, 4);
tmp += stride;
tmp2 += stride;
}
break;
case 1: // masked change
case 10: // masked change with only half of pixels changed
case 11: // cases 10-15 are for method 12 only
case 12:
case 13:
case 14:
case 15:
if(type == 1){
mask = AV_RB16(msk);
msk += 2;
}else{
type -= 10;
mask = ((msk[0] & 0xF0) << shift1[type]) | ((msk[0] & 0xF) << shift2[type]);
msk++;
}
for(y = 0; y < 4; y++){
for(x = 0; x < 4; x++){
tmp[x] = (mask & 0x8000) ? *data++ : tmp2[x];
mask <<= 1;
}
tmp += stride;
tmp2 += stride;
}
break;
case 2: // fill block
for(y = 0; y < 4; y++){
memset(tmp, data[0], 4);
tmp += stride;
}
data++;
break;
case 3: // raw block
for(y = 0; y < 4; y++){
memcpy(tmp, data, 4);
data += 4;
tmp += stride;
}
break;
case 8: // subblocks - method 13 only
mask = *msk++;
for(k = 0; k < 4; k++){
d = ((k & 1) << 1) + ((k & 2) * stride);
d2 = ((k & 1) << 1) + ((k & 2) * stride);
tmp2 = ref + i + d2;
switch(mask & 0xC0){
case 0x80: // motion compensation
x = (*mv) >> 4; if(x & 8) x = 8 - x;
y = (*mv++) & 0xF; if(y & 8) y = 8 - y;
tmp2 += x + y*stride;
case 0x00: // skip
tmp[d + 0 ] = tmp2[0];
tmp[d + 1 ] = tmp2[1];
tmp[d + 0 + stride] = tmp2[0 + stride];
tmp[d + 1 + stride] = tmp2[1 + stride];
break;
case 0x40: // fill
tmp[d + 0 ] = data[0];
tmp[d + 1 ] = data[0];
tmp[d + 0 + stride] = data[0];
tmp[d + 1 + stride] = data[0];
data++;
break;
case 0xC0: // raw
tmp[d + 0 ] = *data++;
tmp[d + 1 ] = *data++;
tmp[d + 0 + stride] = *data++;
tmp[d + 1 + stride] = *data++;
break;
}
mask <<= 2;
}
break;
case 32: // vector quantization - 2 colors
mask = AV_RB16(msk);
msk += 2;
for(y = 0; y < 4; y++){
for(x = 0; x < 4; x++){
tmp[x] = data[mask & 1];
mask >>= 1;
}
tmp += stride;
tmp2 += stride;
}
data += 2;
break;
case 33: // vector quantization - 3 or 4 colors
case 34:
mask = AV_RB32(msk);
msk += 4;
for(y = 0; y < 4; y++){
for(x = 0; x < 4; x++){
tmp[x] = data[mask & 3];
mask >>= 2;
}
tmp += stride;
tmp2 += stride;
}
data += type - 30;
break;
default:
av_log(avctx, AV_LOG_ERROR, "Unknown opcode %d\n", type);
return -1;
}
}
dst += stride * 4;
ref += stride * 4;
}
return 0;
}

static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size)
{
DxaDecContext * const c = (DxaDecContext *)avctx->priv_data;
uint8_t *outptr, *srcptr, *tmpptr;
unsigned long dsize;
int i, j, compr;
int stride;
int orig_buf_size = buf_size;
int pc = 0;

/* make the palette available on the way out */
if(buf[0]=='C' && buf[1]=='M' && buf[2]=='A' && buf[3]=='P'){
int r, g, b;

buf += 4;
for(i = 0; i < 256; i++){
r = *buf++;
g = *buf++;
b = *buf++;
c->pal[i] = (r << 16) | (g << 8) | b;
}
pc = 1;
buf_size -= 768+4;
}

if(avctx->get_buffer(avctx, &c->pic) < 0){
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
return -1;
}
memcpy(c->pic.data[1], c->pal, AVPALETTE_SIZE);
c->pic.palette_has_changed = pc;

outptr = c->pic.data[0];
srcptr = c->decomp_buf;
tmpptr = c->prev.data[0];
stride = c->pic.linesize[0];

if(buf[0]=='N' && buf[1]=='U' && buf[2]=='L' && buf[3]=='L')
compr = -1;
else
compr = buf[4];

dsize = c->dsize;
if((compr != 4 && compr != -1) && uncompress(c->decomp_buf, &dsize, buf + 9, buf_size - 9) != Z_OK){
av_log(avctx, AV_LOG_ERROR, "Uncompress failed!\n");
return -1;
}
switch(compr){
case -1:
c->pic.key_frame = 0;
c->pic.pict_type = FF_P_TYPE;
if(c->prev.data[0])
memcpy(c->pic.data[0], c->prev.data[0], c->pic.linesize[0] * avctx->height);
else{ // Should happen only when first frame is 'NULL'
memset(c->pic.data[0], 0, c->pic.linesize[0] * avctx->height);
c->pic.key_frame = 1;
c->pic.pict_type = FF_I_TYPE;
}
break;
case 2:
case 3:
case 4:
case 5:
c->pic.key_frame = !(compr & 1);
c->pic.pict_type = (compr & 1) ? FF_P_TYPE : FF_I_TYPE;
for(j = 0; j < avctx->height; j++){
if(compr & 1){
for(i = 0; i < avctx->width; i++)
outptr[i] = srcptr[i] ^ tmpptr[i];
tmpptr += stride;
}else
memcpy(outptr, srcptr, avctx->width);
outptr += stride;
srcptr += avctx->width;
}
break;
case 12: // ScummVM coding
case 13:
c->pic.key_frame = 0;
c->pic.pict_type = FF_P_TYPE;
decode_13(avctx, c, c->pic.data[0], srcptr, c->prev.data[0]);
break;
default:
av_log(avctx, AV_LOG_ERROR, "Unknown/unsupported compression type %d\n", buf[4]);
return -1;
}

FFSWAP(AVFrame, c->pic, c->prev);
if(c->pic.data[0])
avctx->release_buffer(avctx, &c->pic);

*data_size = sizeof(AVFrame);
*(AVFrame*)data = c->prev;

/* always report that the buffer was completely consumed */
return orig_buf_size;
}

static int decode_init(AVCodecContext *avctx)
{
DxaDecContext * const c = (DxaDecContext *)avctx->priv_data;

c->avctx = avctx;
avctx->pix_fmt = PIX_FMT_PAL8;

if (avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 0) {
return -1;
}

c->dsize = avctx->width * avctx->height * 2;
if((c->decomp_buf = av_malloc(c->dsize)) == NULL) {
av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
return -1;
}

return 0;
}

static int decode_end(AVCodecContext *avctx)
{
DxaDecContext * const c = (DxaDecContext *)avctx->priv_data;

av_freep(&c->decomp_buf);
if(c->prev.data[0])
avctx->release_buffer(avctx, &c->prev);
if(c->pic.data[0])
avctx->release_buffer(avctx, &c->pic);

return 0;
}

AVCodec dxa_decoder = {
"dxa",
CODEC_TYPE_VIDEO,
CODEC_ID_DXA,
sizeof(DxaDecContext),
decode_init,
NULL,
decode_end,
decode_frame
};


+ 1
- 0
libavformat/Makefile View File

@@ -34,6 +34,7 @@ OBJS-$(CONFIG_DSICIN_DEMUXER) += dsicin.o
OBJS-$(CONFIG_DV_DEMUXER) += dv.o
OBJS-$(CONFIG_DV_MUXER) += dvenc.o
OBJS-$(CONFIG_DV1394_DEMUXER) += dv1394.o
OBJS-$(CONFIG_DXA_DEMUXER) += dxa.o
OBJS-$(CONFIG_EA_DEMUXER) += electronicarts.o
OBJS-$(CONFIG_FFM_DEMUXER) += ffm.o
OBJS-$(CONFIG_FFM_MUXER) += ffm.o


+ 1
- 0
libavformat/allformats.c View File

@@ -65,6 +65,7 @@ void av_register_all(void)
REGISTER_DEMUXER (DTS, dts);
REGISTER_MUXDEMUX(DV, dv);
REGISTER_DEMUXER (DV1394, dv1394);
REGISTER_DEMUXER (DXA, dxa);
REGISTER_DEMUXER (EA, ea);
REGISTER_MUXDEMUX(FFM, ffm);
REGISTER_MUXDEMUX(FLAC, flac);


+ 1
- 0
libavformat/allformats.h View File

@@ -47,6 +47,7 @@ extern AVInputFormat dsicin_demuxer;
extern AVInputFormat dv1394_demuxer;
extern AVInputFormat dv_demuxer;
extern AVOutputFormat dv_muxer;
extern AVInputFormat dxa_demuxer;
extern AVInputFormat ea_demuxer;
extern AVInputFormat ffm_demuxer;
extern AVOutputFormat ffm_muxer;


+ 2
- 2
libavformat/avformat.h View File

@@ -25,8 +25,8 @@
extern "C" {
#endif

#define LIBAVFORMAT_VERSION_INT ((51<<16)+(10<<8)+0)
#define LIBAVFORMAT_VERSION 51.10.0
#define LIBAVFORMAT_VERSION_INT ((51<<16)+(11<<8)+0)
#define LIBAVFORMAT_VERSION 51.11.0
#define LIBAVFORMAT_BUILD LIBAVFORMAT_VERSION_INT

#define LIBAVFORMAT_IDENT "Lavf" AV_STRINGIFY(LIBAVFORMAT_VERSION)


+ 214
- 0
libavformat/dxa.c View File

@@ -0,0 +1,214 @@
/*
* DXA demuxer
* Copyright (c) 2007 Konstantin Shishkov.
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/

#include "avformat.h"
#include "riff.h"

#define DXA_EXTRA_SIZE 9

typedef struct{
int frames;
int has_sound;
int bpc;
uint32_t bytes_left;
int64_t wavpos, vidpos;
int readvid;
}DXAContext;

static int dxa_probe(AVProbeData *p)
{
/* check file header */
if (p->buf_size <= 4)
return 0;
if (p->buf[0] == 'D' && p->buf[1] == 'E' &&
p->buf[2] == 'X' && p->buf[3] == 'A')
return AVPROBE_SCORE_MAX;
else
return 0;
}

static int dxa_read_header(AVFormatContext *s, AVFormatParameters *ap)
{
ByteIOContext *pb = &s->pb;
DXAContext *c = s->priv_data;
AVStream *st, *ast;
uint32_t tag;
int32_t fps;
int w, h;
int num, den;
int flags;

tag = get_le32(pb);
if (tag != MKTAG('D', 'E', 'X', 'A'))
return -1;
flags = get_byte(pb);
c->frames = get_be16(pb);
if(!c->frames){
av_log(s, AV_LOG_ERROR, "File contains no frames ???\n");
return -1;
}

fps = get_be32(pb);
if(fps > 0){
den = 1000;
num = fps;
}else if (fps < 0){
den = 100000;
num = -fps;
}else{
den = 10;
num = 1;
}
w = get_be16(pb);
h = get_be16(pb);
c->has_sound = 0;

st = av_new_stream(s, 0);
if (!st)
return -1;

// Parse WAV data header
if(get_le32(pb) == MKTAG('W', 'A', 'V', 'E')){
uint32_t size, fsize;
c->has_sound = 1;
size = get_be32(pb);
c->vidpos = url_ftell(pb) + size;
url_fskip(pb, 16);
fsize = get_le32(pb);

ast = av_new_stream(s, 0);
if (!ast)
return -1;
get_wav_header(pb, ast->codec, fsize);
// find 'data' chunk
while(url_ftell(pb) < c->vidpos && !url_feof(pb)){
tag = get_le32(pb);
fsize = get_le32(pb);
if(tag == MKTAG('d', 'a', 't', 'a')) break;
url_fskip(pb, fsize);
}
c->bpc = (fsize + c->frames - 1) / c->frames;
if(ast->codec->block_align)
c->bpc = ((c->bpc + ast->codec->block_align - 1) / ast->codec->block_align) * ast->codec->block_align;
c->bytes_left = fsize;
c->wavpos = url_ftell(pb);
url_fseek(pb, c->vidpos, SEEK_SET);
}

/* now we are ready: build format streams */
st->codec->codec_type = CODEC_TYPE_VIDEO;
st->codec->codec_id = CODEC_ID_DXA;
st->codec->width = w;
st->codec->height = h;
av_reduce(&den, &num, den, num, (1UL<<31)-1);
av_set_pts_info(st, 33, num, den);
/* flags & 0x80 means that image is interlaced,
* flags & 0x40 means that image has double height
* either way set true height
*/
if(flags & 0xC0){
st->codec->height >>= 1;
}
c->readvid = !c->has_sound;
c->vidpos = url_ftell(pb);
s->start_time = 0;
s->duration = (int64_t)c->frames * AV_TIME_BASE * num / den;
av_log(s, AV_LOG_DEBUG, "%d frame(s)\n",c->frames);

return 0;
}

static int dxa_read_packet(AVFormatContext *s, AVPacket *pkt)
{
DXAContext *c = s->priv_data;
int ret;
uint32_t size;
uint8_t buf[DXA_EXTRA_SIZE], pal[768+4];
int pal_size = 0;

if(!c->readvid && c->has_sound && c->bytes_left){
c->readvid = 1;
url_fseek(&s->pb, c->wavpos, SEEK_SET);
size = FFMIN(c->bytes_left, c->bpc);
ret = av_get_packet(&s->pb, pkt, size);
pkt->stream_index = 1;
if(ret != size)
return AVERROR_IO;
c->bytes_left -= size;
c->wavpos = url_ftell(&s->pb);
return 0;
}
url_fseek(&s->pb, c->vidpos, SEEK_SET);
while(!url_feof(&s->pb) && c->frames){
get_buffer(&s->pb, buf, 4);
switch(AV_RL32(buf)){
case MKTAG('N', 'U', 'L', 'L'):
if(av_new_packet(pkt, 4 + pal_size) < 0)
return AVERROR_NOMEM;
pkt->stream_index = 0;
if(pal_size) memcpy(pkt->data, pal, pal_size);
memcpy(pkt->data + pal_size, buf, 4);
c->frames--;
c->vidpos = url_ftell(&s->pb);
c->readvid = 0;
return 0;
case MKTAG('C', 'M', 'A', 'P'):
pal_size = 768+4;
memcpy(pal, buf, 4);
get_buffer(&s->pb, pal + 4, 768);
break;
case MKTAG('F', 'R', 'A', 'M'):
get_buffer(&s->pb, buf + 4, DXA_EXTRA_SIZE - 4);
size = AV_RB32(buf + 5);
if(size > 0xFFFFFF){
av_log(s, AV_LOG_ERROR, "Frame size is too big: %d\n", size);
return -1;
}
if(av_new_packet(pkt, size + DXA_EXTRA_SIZE + pal_size) < 0)
return AVERROR_NOMEM;
memcpy(pkt->data + pal_size, buf, DXA_EXTRA_SIZE);
ret = get_buffer(&s->pb, pkt->data + DXA_EXTRA_SIZE + pal_size, size);
if(ret != size){
av_free_packet(pkt);
return AVERROR_IO;
}
if(pal_size) memcpy(pkt->data, pal, pal_size);
pkt->stream_index = 0;
c->frames--;
c->vidpos = url_ftell(&s->pb);
c->readvid = 0;
return 0;
default:
av_log(s, AV_LOG_ERROR, "Unknown tag %c%c%c%c\n", buf[0], buf[1], buf[2], buf[3]);
return -1;
}
}
return AVERROR(EIO);
}

AVInputFormat dxa_demuxer = {
"dxa",
"dxa",
sizeof(DXAContext),
dxa_probe,
dxa_read_header,
dxa_read_packet,
};

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