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-rw-r--r--demux_asf.c268
1 files changed, 268 insertions, 0 deletions
diff --git a/demux_asf.c b/demux_asf.c
new file mode 100644
index 0000000000..ed8532a7a1
--- /dev/null
+++ b/demux_asf.c
@@ -0,0 +1,268 @@
+// ASF file parser for DEMUXER v0.3 by A'rpi/ESP-team
+
+// based on asf file-format doc by Eugene [http://divx.euro.ru]
+
+//static float avi_pts_frametime=1.0f/25.0f;
+//static float avi_audio_pts=0;
+//static float avi_video_pts=0;
+
+//static int skip_video_frames=0;
+
+typedef struct __attribute__((packed)) {
+ unsigned char streamno;
+ unsigned char seq;
+ unsigned long x;
+ unsigned char flag;
+} ASF_segmhdr_t;
+
+
+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 d;
+// int len;
+ int skip;
+ float pts=0;
+ unsigned char c=0;
+ demux_stream_t *ds=NULL;
+
+ if(verbose>=4) printf("demux_asf.read_packet: id=%d seq=%d len=%d\n",id,seq,len);
+
+#if 0
+ if(demux->video->id==-1) {
+ demux->video->id=asf_video_id;
+ if(verbose) printf("ASF video ID = %d\n",demux->video->id);
+ }
+ if(demux->audio->id==-1)
+ if(id!=asf_video_id && id!=demux->video->id){
+ demux->audio->id=id;
+ if(verbose) printf("ASF audio ID = %d\n",demux->audio->id);
+ }
+#endif
+
+ if(id==demux->audio->id){
+ // audio
+ ds=demux->audio;
+ } else
+ if(id==demux->video->id){
+ // video
+ ds=demux->video;
+ }
+
+ 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) printf("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);
+ if(verbose>=4) printf("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){
+ printf("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;
+// 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){
+unsigned int id=0;
+unsigned int len;
+int skipped=0;
+int max_packs=128;
+int ret=0;
+
+ demux->filepos=stream_tell(demux->stream);
+ if(demux->filepos>=demux->endpos){
+ demux->stream->eof=1;
+ return 0;
+ }
+
+ stream_read(demux->stream,asf_packet,(int)fileh.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+(int)fileh.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=p[0]|(p[1]<<8); p+=2;
+ if(verbose>1)printf("Explicit packet size specified: %d \n",plen);
+ if(plen>fileh.packetsize) printf("Warning! plen>packetsize! (%d>%d) \n",plen,(int)fileh.packetsize);
+ if(flags&(8|16)){
+ padding=p[0];p++;
+ if(flags&16){ padding|=p[0]<<8; p++;}
+ if(verbose)printf("Warning! explicit=%d padding=%d \n",plen,fileh.packetsize-padding);
+ }
+ } else {
+ // Padding (relative) size
+ if(flags&8){
+ padding=p[0];++p;
+ } else
+ if(flags&16){
+ padding=p[0]|(p[1]<<8);p+=2;
+ }
+ plen=fileh.packetsize-padding;
+ }
+
+ time=*((unsigned long*)p);p+=4;
+ duration=*((unsigned short*)p);p+=2;
+ if(flags&1){
+ segsizetype=p[0] & 0xC0;
+ segs=p[0] & 0x3F;
+ ++p;
+ }
+ if(verbose>=4) printf("%08X: flag=%02X segs=%d pad=%d time=%d 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;
+
+ if(p>=p_end) printf("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;
+ seq=p[1];
+ p+=2;
+
+ switch(segtype){
+ case 0x55:
+ x=*((unsigned char*)p);
+ p++;
+ break;
+ case 0x59:
+ x=*((unsigned short*)p);
+ p+=2;
+ break;
+ case 0x5D:
+ x=*((unsigned long*)p);
+ p+=4;
+ break;
+ default:
+ printf("Warning! unknown segtype == 0x%2X \n",segtype);
+ }
+
+ 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=*((unsigned long*)p);p+=4;
+ break;
+ default:
+ printf("unknown segment type: 0x%02X \n",type);
+ }
+
+ if(flags&1){
+ // multiple segments
+ if(segsizetype==0x40){
+ len=*((unsigned char*)p);p++; // 1 byte
+ } else {
+ len=*((unsigned short*)p);p+=2; // 2 byte
+ }
+ } else {
+ // single segment
+ len=plen-(p-asf_packet);
+ }
+ if(len<0 || (p+len)>=p_end){
+ printf("ASF_parser: warning! segment len=%d\n",len);
+ }
+ if(verbose>=4) printf(" 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);
+ p+=len2;
+ len-=len2+1;
+ }
+ if(len!=0){
+ printf("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);
+ p+=len;
+ break;
+ }
+
+ } // for segs
+ return 1; // success
+ }
+
+ printf("%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;
+}
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