mirror of
https://github.com/mpv-player/mpv
synced 2024-12-11 17:37:23 +00:00
259 lines
8.1 KiB
C
259 lines
8.1 KiB
C
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// ASF file parser for DEMUXER v0.3 by A'rpi/ESP-team
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// based on asf file-format doc by Eugene [http://divx.euro.ru]
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//static float avi_pts_frametime=1.0f/25.0f;
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//static float avi_audio_pts=0;
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//static float avi_video_pts=0;
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//static int skip_video_frames=0;
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typedef struct __attribute__((packed)) {
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unsigned char streamno;
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unsigned char seq;
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unsigned long x;
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unsigned char flag;
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} ASF_segmhdr_t;
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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){
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demux_stream_t *ds=NULL;
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if(verbose>=4) printf("demux_asf.read_packet: id=%d seq=%d len=%d\n",id,seq,len);
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#if 0
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if(demux->video->id==-1) {
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demux->video->id=asf_video_id;
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if(verbose) printf("ASF video ID = %d\n",demux->video->id);
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}
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if(demux->audio->id==-1)
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if(id!=asf_video_id && id!=demux->video->id){
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demux->audio->id=id;
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if(verbose) printf("ASF audio ID = %d\n",demux->audio->id);
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}
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#endif
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if(id==demux->audio->id){
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// audio
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ds=demux->audio;
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} else
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if(id==demux->video->id){
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// video
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ds=demux->video;
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}
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if(ds){
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if(ds->asf_packet){
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if(ds->asf_seq!=seq){
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// closed segment, finalize packet:
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if(ds==demux->audio)
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if(asf_scrambling_h>1 && asf_scrambling_w>1)
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asf_descrambling(ds->asf_packet->buffer,ds->asf_packet->len);
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ds_add_packet(ds,ds->asf_packet);
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ds->asf_packet=NULL;
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} else {
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// append data to it!
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demux_packet_t* dp=ds->asf_packet;
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if(dp->len!=offs && offs!=-1) printf("warning! fragment.len=%d BUT next fragment offset=%d \n",dp->len,offs);
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dp->buffer=realloc(dp->buffer,dp->len+len);
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memcpy(dp->buffer+dp->len,data,len);
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if(verbose>=4) printf("data appended! %d+%d\n",dp->len,len);
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dp->len+=len;
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// we are ready now.
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return 1;
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}
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}
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// create new packet:
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{ demux_packet_t* dp;
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if(offs>0){
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printf("warning! broken fragment, %d bytes missing \n",offs);
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return 0;
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}
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dp=new_demux_packet(len);
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memcpy(dp->buffer,data,len);
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dp->pts=time*0.001f;
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// if(ds==demux->video) printf("ASF time: %8d dur: %5d \n",time,dur);
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dp->pos=demux->filepos;
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ds->asf_packet=dp;
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ds->asf_seq=seq;
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// we are ready now.
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return 1;
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}
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}
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return 0;
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}
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//static int num_elementary_packets100=0;
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//static int num_elementary_packets101=0;
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// return value:
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// 0 = EOF or no stream found
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// 1 = successfully read a packet
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int demux_asf_fill_buffer(demuxer_t *demux){
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demux->filepos=stream_tell(demux->stream);
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if(demux->filepos>=demux->endpos){
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demux->stream->eof=1;
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return 0;
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}
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stream_read(demux->stream,asf_packet,(int)fileh.packetsize);
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if(demux->stream->eof) return 0; // EOF
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if(asf_packet[0]==0x82){
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unsigned char flags=asf_packet[3];
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unsigned char segtype=asf_packet[4];
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unsigned char* p=&asf_packet[5];
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unsigned char* p_end=p+(int)fileh.packetsize;
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unsigned long time;
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unsigned short duration;
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int segs=1;
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unsigned char segsizetype=0x80;
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int seg;
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int padding=0;
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int plen;
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if(verbose>1){
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int i;
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for(i=0;i<16;i++) printf(" %02X",asf_packet[i]);
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printf("\n");
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}
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//if(segtype!=0x5d) printf("Warning! packet[4] != 0x5d \n");
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// Calculate packet size (plen):
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if(flags&0x40){
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// Explicit (absoulte) packet size
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plen=p[0]|(p[1]<<8); p+=2;
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if(verbose>1)printf("Explicit packet size specified: %d \n",plen);
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if(plen>fileh.packetsize) printf("Warning! plen>packetsize! (%d>%d) \n",plen,(int)fileh.packetsize);
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if(flags&(8|16)){
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padding=p[0];p++;
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if(flags&16){ padding|=p[0]<<8; p++;}
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if(verbose)printf("Warning! explicit=%d padding=%d \n",plen,fileh.packetsize-padding);
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}
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} else {
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// Padding (relative) size
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if(flags&8){
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padding=p[0];++p;
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} else
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if(flags&16){
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padding=p[0]|(p[1]<<8);p+=2;
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}
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plen=fileh.packetsize-padding;
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}
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time=*((unsigned long*)p);p+=4;
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duration=*((unsigned short*)p);p+=2;
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if(flags&1){
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segsizetype=p[0] & 0xC0;
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segs=p[0] & 0x3F;
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++p;
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}
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if(verbose>=4) printf("%08X: flag=%02X segs=%d pad=%d time=%d dur=%d\n",
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demux->filepos,flags,segs,padding,time,duration);
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for(seg=0;seg<segs;seg++){
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//ASF_segmhdr_t* sh;
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unsigned char streamno;
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unsigned char seq;
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int len;
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unsigned long x;
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unsigned char type;
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unsigned long time2;
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if(p>=p_end) printf("Warning! invalid packet 1, sig11 coming soon...\n");
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if(verbose>1){
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int i;
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printf("seg %d:",seg);
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for(i=0;i<16;i++) printf(" %02X",p[i]);
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printf("\n");
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}
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streamno=p[0]&0x7F;
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seq=p[1];
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p+=2;
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switch(segtype){
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case 0x55:
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x=*((unsigned char*)p);
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p++;
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break;
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case 0x59:
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x=*((unsigned short*)p);
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p+=2;
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break;
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case 0x5D:
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x=*((unsigned long*)p);
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p+=4;
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break;
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default:
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printf("Warning! unknown segtype == 0x%2X \n",segtype);
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}
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type=p[0]; p++; // 0x01: grouping 0x08: single
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switch(type){
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case 0x01:
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//printf("grouping: %02X \n",p[0]);
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++p; // skip unknown byte
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break;
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case 0x08:
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//printf("!!! obj_length = %d\n",*((unsigned long*)p));
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p+=4;
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time2=*((unsigned long*)p);p+=4;
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break;
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default:
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printf("unknown segment type: 0x%02X \n",type);
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}
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if(flags&1){
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// multiple segments
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if(segsizetype==0x40){
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len=*((unsigned char*)p);p++; // 1 byte
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} else {
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len=*((unsigned short*)p);p+=2; // 2 byte
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}
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} else {
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// single segment
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len=plen-(p-asf_packet);
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}
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if(len<0 || (p+len)>=p_end){
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printf("ASF_parser: warning! segment len=%d\n",len);
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}
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if(verbose>=4) printf(" seg #%d: streamno=%d seq=%d type=%02X len=%d\n",seg,streamno,seq,type,len);
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switch(type){
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case 0x01:
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// GROUPING:
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//printf("ASF_parser: warning! grouping (flag=1) not yet supported!\n",len);
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//printf(" total: %d \n",len);
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while(len>0){
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int len2=p[0];
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p++;
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//printf(" group part: %d bytes\n",len2);
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demux_asf_read_packet(demux,p,len2,streamno,seq,x,duration,-1);
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p+=len2;
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len-=len2+1;
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}
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if(len!=0){
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printf("ASF_parser: warning! groups total != len\n");
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}
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break;
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case 0x08:
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// NO GROUPING:
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//printf("fragment offset: %d \n",sh->x);
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demux_asf_read_packet(demux,p,len,streamno,seq,time2,duration,x);
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p+=len;
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break;
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}
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} // for segs
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return 1; // success
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}
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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]);
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return 0;
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}
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