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mpv/libmpdemux/demux_asf.c

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// ASF file parser for DEMUXER v0.3 by A'rpi/ESP-team
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "config.h"
#include "mp_msg.h"
#include "help_mp.h"
#include "stream.h"
#include "asf.h"
#include "demuxer.h"
/*
* Load 16/32-bit values in little endian byte order
* from an unaligned address
*/
#ifdef ARCH_X86
#define LOAD_LE32(p) (*(unsigned int*)(p))
#define LOAD_LE16(p) (*(unsigned short*)(p))
#else
#define LOAD_LE32(p) (((unsigned char*)(p))[0] | \
((unsigned char*)(p))[1]<< 8 | \
((unsigned char*)(p))[2]<<16 | \
((unsigned char*)(p))[3]<<24 )
#define LOAD_LE16(p) (((unsigned char*)(p))[0] | \
((unsigned char*)(p))[1]<<8)
#endif
// defined at asfheader.c:
extern unsigned char* asf_packet;
extern int asf_scrambling_h;
extern int asf_scrambling_w;
extern int asf_scrambling_b;
extern int asf_packetsize;
// based on asf file-format doc by Eugene [http://divx.euro.ru]
static void asf_descrambling(unsigned char *src,int len){
unsigned char *dst=malloc(len);
unsigned char *s2=src;
int i=0,x,y;
while(len-i>=asf_scrambling_h*asf_scrambling_w*asf_scrambling_b){
// mp_msg(MSGT_DEMUX,MSGL_DBG4,"descrambling! (w=%d b=%d)\n",w,asf_scrambling_b);
//i+=asf_scrambling_h*asf_scrambling_w;
for(x=0;x<asf_scrambling_w;x++)
for(y=0;y<asf_scrambling_h;y++){
memcpy(dst+i,s2+(y*asf_scrambling_w+x)*asf_scrambling_b,asf_scrambling_b);
i+=asf_scrambling_b;
}
s2+=asf_scrambling_h*asf_scrambling_w*asf_scrambling_b;
}
//if(i<len) memcpy(dst+i,src+i,len-i);
memcpy(src,dst,i);
free(dst);
}
static int demux_asf_read_packet(demuxer_t *demux,unsigned char *data,int len,int id,int seq,unsigned long time,unsigned short dur,int offs,int keyframe){
demux_stream_t *ds=NULL;
mp_dbg(MSGT_DEMUX,MSGL_DBG4,"demux_asf.read_packet: id=%d seq=%d len=%d\n",id,seq,len);
if(demux->video->id==-1)
if(demux->v_streams[id])
demux->video->id=id;
if(demux->audio->id==-1)
if(demux->a_streams[id])
demux->audio->id=id;
if(id==demux->audio->id){
// audio
ds=demux->audio;
if(!ds->sh){
ds->sh=demux->a_streams[id];
mp_msg(MSGT_DEMUX,MSGL_V,"Auto-selected ASF audio ID = %d\n",ds->id);
}
} else
if(id==demux->video->id){
// video
ds=demux->video;
if(!ds->sh){
ds->sh=demux->v_streams[id];
mp_msg(MSGT_DEMUX,MSGL_V,"Auto-selected ASF video ID = %d\n",ds->id);
}
}
if(ds){
if(ds->asf_packet){
if(ds->asf_seq!=seq){
// closed segment, finalize packet:
if(ds==demux->audio)
if(asf_scrambling_h>1 && asf_scrambling_w>1)
asf_descrambling(ds->asf_packet->buffer,ds->asf_packet->len);
ds_add_packet(ds,ds->asf_packet);
ds->asf_packet=NULL;
} else {
// append data to it!
demux_packet_t* dp=ds->asf_packet;
if(dp->len!=offs && offs!=-1) mp_msg(MSGT_DEMUX,MSGL_V,"warning! fragment.len=%d BUT next fragment offset=%d \n",dp->len,offs);
dp->buffer=realloc(dp->buffer,dp->len+len);
memcpy(dp->buffer+dp->len,data,len);
mp_dbg(MSGT_DEMUX,MSGL_DBG4,"data appended! %d+%d\n",dp->len,len);
dp->len+=len;
// we are ready now.
return 1;
}
}
// create new packet:
{ demux_packet_t* dp;
if(offs>0){
mp_msg(MSGT_DEMUX,MSGL_V,"warning! broken fragment, %d bytes missing \n",offs);
return 0;
}
dp=new_demux_packet(len);
memcpy(dp->buffer,data,len);
dp->pts=time*0.001f;
dp->flags=keyframe;
// if(ds==demux->video) printf("ASF time: %8d dur: %5d \n",time,dur);
dp->pos=demux->filepos;
ds->asf_packet=dp;
ds->asf_seq=seq;
// we are ready now.
return 1;
}
}
return 0;
}
//static int num_elementary_packets100=0;
//static int num_elementary_packets101=0;
// return value:
// 0 = EOF or no stream found
// 1 = successfully read a packet
int demux_asf_fill_buffer(demuxer_t *demux){
demux->filepos=stream_tell(demux->stream);
if(demux->filepos>=demux->movi_end){
demux->stream->eof=1;
return 0;
}
stream_read(demux->stream,asf_packet,asf_packetsize);
if(demux->stream->eof) return 0; // EOF
if(asf_packet[0]==0x82){
unsigned char flags=asf_packet[3];
unsigned char segtype=asf_packet[4];
unsigned char* p=&asf_packet[5];
unsigned char* p_end=p+asf_packetsize;
unsigned long time;
unsigned short duration;
int segs=1;
unsigned char segsizetype=0x80;
int seg;
int padding=0;
int plen;
if(verbose>1){
int i;
for(i=0;i<16;i++) printf(" %02X",asf_packet[i]);
printf("\n");
}
//if(segtype!=0x5d) printf("Warning! packet[4] != 0x5d \n");
// Calculate packet size (plen):
if(flags&0x40){
// Explicit (absoulte) packet size
plen=LOAD_LE16(p); p+=2;
mp_dbg(MSGT_DEMUX,MSGL_DBG2,"Explicit packet size specified: %d \n",plen);
if(plen>asf_packetsize) mp_msg(MSGT_DEMUX,MSGL_V,"Warning! plen>packetsize! (%d>%d) \n",plen,asf_packetsize);
if(flags&(8|16)){
padding=p[0];p++;
if(flags&16){ padding|=p[0]<<8; p++;}
mp_msg(MSGT_DEMUX,MSGL_V,"Warning! explicit=%d padding=%d \n",plen,asf_packetsize-padding);
}
} else {
// Padding (relative) size
if(flags&8){
padding=p[0];++p;
} else
if(flags&16){
padding=LOAD_LE16(p);p+=2;
}
plen=asf_packetsize-padding;
}
time = LOAD_LE32(p); p+=4;
duration = LOAD_LE16(p); p+=2;
if(flags&1){
segsizetype=p[0] & 0xC0;
segs=p[0] & 0x3F;
++p;
}
mp_dbg(MSGT_DEMUX,MSGL_DBG4,"%08X: flag=%02X segs=%d pad=%d time=%ld dur=%d\n",
demux->filepos,flags,segs,padding,time,duration);
for(seg=0;seg<segs;seg++){
//ASF_segmhdr_t* sh;
unsigned char streamno;
unsigned char seq;
int len;
unsigned long x;
unsigned char type;
unsigned long time2;
int keyframe=0;
if(p>=p_end) mp_msg(MSGT_DEMUX,MSGL_V,"Warning! invalid packet 1, sig11 coming soon...\n");
if(verbose>1){
int i;
printf("seg %d:",seg);
for(i=0;i<16;i++) printf(" %02X",p[i]);
printf("\n");
}
streamno=p[0]&0x7F;
if(p[0]&0x80) keyframe=1;
seq=p[1];
p+=2;
switch(segtype){
case 0x55:
x=*((unsigned char*)p);
p++;
break;
case 0x59:
x=LOAD_LE16(p);
p+=2;
break;
case 0x5D:
x=LOAD_LE32(p);
p+=4;
break;
default:
mp_msg(MSGT_DEMUX,MSGL_V,"Warning! unknown segtype == 0x%2X \n",segtype);
x=0;
}
type=p[0]; p++; // 0x01: grouping 0x08: single
switch(type){
case 0x01:
//printf("grouping: %02X \n",p[0]);
++p; // skip unknown byte
break;
case 0x08:
//printf("!!! obj_length = %d\n",*((unsigned long*)p));
p+=4;
time2=LOAD_LE32(p);p+=4;
break;
default:
mp_msg(MSGT_DEMUX,MSGL_V,"unknown segment type: 0x%02X \n",type);
}
if(flags&1){
// multiple segments
if(segsizetype==0x40){
len=*((unsigned char*)p);p++; // 1 byte
} else {
len=LOAD_LE16(p);p+=2; // 2 byte
}
} else {
// single segment
len=plen-(p-asf_packet);
}
if(len<0 || (p+len)>=p_end){
mp_msg(MSGT_DEMUX,MSGL_V,"ASF_parser: warning! segment len=%d\n",len);
}
mp_dbg(MSGT_DEMUX,MSGL_DBG4," seg #%d: streamno=%d seq=%d type=%02X len=%d\n",seg,streamno,seq,type,len);
switch(type){
case 0x01:
// GROUPING:
//printf("ASF_parser: warning! grouping (flag=1) not yet supported!\n",len);
//printf(" total: %d \n",len);
while(len>0){
int len2=p[0];
p++;
//printf(" group part: %d bytes\n",len2);
demux_asf_read_packet(demux,p,len2,streamno,seq,x,duration,-1,keyframe);
p+=len2;
len-=len2+1;
}
if(len!=0){
mp_msg(MSGT_DEMUX,MSGL_V,"ASF_parser: warning! groups total != len\n");
}
break;
case 0x08:
// NO GROUPING:
//printf("fragment offset: %d \n",sh->x);
demux_asf_read_packet(demux,p,len,streamno,seq,time2,duration,x,keyframe);
p+=len;
break;
}
} // for segs
return 1; // success
}
mp_msg(MSGT_DEMUX,MSGL_V,"%08X: UNKNOWN TYPE %02X %02X %02X %02X %02X...\n",demux->filepos,asf_packet[0],asf_packet[1],asf_packet[2],asf_packet[3],asf_packet[4]);
return 0;
}
#include "stheader.h"
void demux_seek_asf(demuxer_t *demuxer,float rel_seek_secs,int flags){
demux_stream_t *d_audio=demuxer->audio;
demux_stream_t *d_video=demuxer->video;
sh_audio_t *sh_audio=d_audio->sh;
// sh_video_t *sh_video=d_video->sh;
//FIXME: OFF_T - didn't test ASF case yet (don't have a large asf...)
//FIXME: reports good or bad to steve@daviesfam.org please
//================= seek in ASF ==========================
float p_rate=10; // packets / sec
off_t rel_seek_packs=(flags&2)? // FIXME: int may be enough?
(rel_seek_secs*(demuxer->movi_end-demuxer->movi_start)/asf_packetsize):
(rel_seek_secs*p_rate);
off_t rel_seek_bytes=rel_seek_packs*asf_packetsize;
off_t newpos;
//printf("ASF: packs: %d duration: %d \n",(int)fileh.packets,*((int*)&fileh.duration));
// printf("ASF_seek: %d secs -> %d packs -> %d bytes \n",
// rel_seek_secs,rel_seek_packs,rel_seek_bytes);
newpos=((flags&1)?demuxer->movi_start:demuxer->filepos)+rel_seek_bytes;
if(newpos<0 || newpos<demuxer->movi_start) newpos=demuxer->movi_start;
// printf("\r -- asf: newpos=%d -- \n",newpos);
stream_seek(demuxer->stream,newpos);
ds_fill_buffer(d_video);
if(sh_audio){
ds_fill_buffer(d_audio);
resync_audio_stream(sh_audio);
}
while(1){
if(sh_audio && !d_audio->eof){
float a_pts=d_audio->pts;
a_pts+=(ds_tell_pts(d_audio)-sh_audio->a_in_buffer_len)/(float)sh_audio->i_bps;
// sync audio:
if (d_video->pts > a_pts){
skip_audio_frame(sh_audio);
// if(!ds_fill_buffer(d_audio)) sh_audio=NULL; // skip audio. EOF?
continue;
}
}
if(d_video->flags&1) break; // found a keyframe!
if(!ds_fill_buffer(d_video)) break; // skip frame. EOF?
}
}
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