demux_asf.c

来自「君正早期ucos系统(只有早期的才不没有打包成库),MPLAYER,文件系统,图」· C语言 代码 · 共 710 行 · 第 1/2 页

            if( mp_msg_test(MSGT_DEMUX,MSGL_DBG2) ){
                int i;
                for(i=0;i<16;i++) printf(" %02X",asf->packet[i]);
                printf("\n");
            }
            
	    // skip ECC data if present by testing bit 7 of flags
	    // 1xxxbbbb -> ecc data present, skip bbbb byte(s)
	    // 0xxxxxxx -> payload parsing info starts
	    if (flags & 0x80)
	    {
		p += (flags & 0x0f)+1;
		flags = p[0];
		segtype = p[1];
	    }
	    
            //if(segtype!=0x5d) printf("Warning! packet[4] != 0x5d  \n");

	    p+=2; // skip flags & segtype

            // Read packet size (plen):
	    switch((flags>>5)&3){
	    case 3: plen=LOAD_LE32(p);p+=4;break;	// dword
	    case 2: plen=LOAD_LE16(p);p+=2;break;	// word
	    case 1: plen=p[0];p++;break;		// byte
	    default: plen=0;
		//plen==0 is handled later
		//mp_msg(MSGT_DEMUX,MSGL_V,"Invalid plen type! assuming plen=0\n");
	    }

            // Read sequence:
	    switch((flags>>1)&3){
	    case 3: sequence=LOAD_LE32(p);p+=4;break;	// dword
	    case 2: sequence=LOAD_LE16(p);p+=2;break;	// word
	    case 1: sequence=p[0];p++;break;		// byte
	    default: sequence=0;
	    }

            // Read padding size (padding):
	    switch((flags>>3)&3){
	    case 3: padding=LOAD_LE32(p);p+=4;break;	// dword
	    case 2: padding=LOAD_LE16(p);p+=2;break;	// word
	    case 1: padding=p[0];p++;break;		// byte
	    default: padding=0;
	    }
	    
	    if(((flags>>5)&3)!=0){
              // Explicit (absoulte) packet size
              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);
	    } else {
              // Padding (relative) size
              plen=asf->packetsize-padding;
	    }

	    // Read time & duration:
	    time = LOAD_LE32(p); p+=4;
	    duration = LOAD_LE16(p); p+=2;

	    // Read payload flags:
            if(flags&1){
	      // multiple sub-packets
              segsizetype=p[0]>>6;
              segs=p[0] & 0x3F;
              ++p;
            }
            mp_dbg(MSGT_DEMUX,MSGL_DBG4,"%08"PRIu64":  flag=%02X  segs=%d  seq=%u  plen=%u  pad=%u  time=%ld  dur=%d\n",
              (uint64_t)demux->filepos,flags,segs,sequence,plen,padding,time,duration);

            for(seg=0;seg<segs;seg++){
              //ASF_segmhdr_t* sh;
              unsigned char streamno;
              unsigned int seq;
              unsigned int x;	// offset or timestamp
	      unsigned int rlen;
	      //
              int len;
              uint64_t time2=0;
	      int keyframe=0;

              if(p>=p_end || p < 0x80000000) {
                mp_msg(MSGT_DEMUX,MSGL_V,"Warning! invalid packet 1, aborting parsing...\n");
                break;
              }

              if( mp_msg_test(MSGT_DEMUX,MSGL_DBG2) ){
                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;
	      p++;

              // Read media object number (seq):
	      switch((segtype>>4)&3){
	      case 3: seq=LOAD_LE32(p);p+=4;break;	// dword
	      case 2: seq=LOAD_LE16(p);p+=2;break;	// word
	      case 1: seq=p[0];p++;break;		// byte
	      default: seq=0;
	      }
	      
              // Read offset or timestamp:
	      switch((segtype>>2)&3){
	      case 3: x=LOAD_LE32(p);p+=4;break;	// dword
	      case 2: x=LOAD_LE16(p);p+=2;break;	// word
	      case 1: x=p[0];p++;break;		// byte
	      default: x=0;
	      }

              // Read replic.data len:
	      switch((segtype)&3){
	      case 3: rlen=LOAD_LE32(p);p+=4;break;	// dword
	      case 2: rlen=LOAD_LE16(p);p+=2;break;	// word
	      case 1: rlen=p[0];p++;break;		// byte
	      default: rlen=0;
	      }

//	      printf("### rlen=%d   \n",rlen);
      
              switch(rlen){
              case 0x01: // 1 = special, means grouping
	        //printf("grouping: %02X  \n",p[0]);
                ++p; // skip PTS delta
                break;
              default:
	        if(rlen>=8){
            	    p+=4;	// skip object size
            	    time2=LOAD_LE32(p); // read PTS
            	    if (asf->asf_is_dvr_ms)
            	        get_payload_extension_data(demux, &p, streamno, seq, &keyframe, &time2);
#ifdef JZ47_OPT
              if (rlen <= 0x20)
#endif
		    p+=rlen-4;
		} else {
            	    mp_msg(MSGT_DEMUX,MSGL_V,"unknown segment type (rlen): 0x%02X  \n",rlen);
		    time2=0; // unknown
		    p+=rlen;
		}
              }

              if(flags&1){
                // multiple segments
		switch(segsizetype){
	          case 3: len=LOAD_LE32(p);p+=4;break;	// dword
	          case 2: len=LOAD_LE16(p);p+=2;break;	// word
	          case 1: len=p[0];p++;break;		// byte
	          default: len=plen-(p-asf->packet); // ???
		}
              } else {
                // single segment
                len=plen-(p-asf->packet);
              }
#ifdef JZ47_OPT
              if (rlen > 0x20)
	        len = 1536;
#endif
              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,rlen,len);

              switch(rlen){
              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;
		  ++seq;
		}
                if(len!=0){
                  mp_msg(MSGT_DEMUX,MSGL_V,"ASF_parser: warning! groups total != len\n");
                }
                break;
              default:
                // NO GROUPING:
                //printf("fragment offset: %d  \n",sh->x);
                if (!asf->asf_is_dvr_ms || asf->found_first_key_frame)
                    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,"%08"PRIX64":  UNKNOWN TYPE  %02X %02X %02X %02X %02X...\n",(int64_t)demux->filepos,asf->packet[0],asf->packet[1],asf->packet[2],asf->packet[3],asf->packet[4]);
    return 0;
}

#include "stheader.h"

extern void skip_audio_frame(sh_audio_t *sh_audio);

static void demux_seek_asf(demuxer_t *demuxer,float rel_seek_secs,float audio_delay,int flags){
    struct asf_priv* asf = demuxer->priv;
    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 [e-mail] please

  //================= seek in ASF ==========================
    float p_rate=asf->packetrate; // 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);

    if (asf->asf_is_dvr_ms) asf->dvr_last_vid_pts = 0.0f;

    if (d_video->id >= 0)
    ds_fill_buffer(d_video);
    if(sh_audio){
      ds_fill_buffer(d_audio);
    }
    
    if (d_video->id >= 0)
    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?
    }


}

static int demux_asf_control(demuxer_t *demuxer,int cmd, void *arg){
    struct asf_priv* asf = demuxer->priv;
/*  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;
*/
    switch(cmd) {
	case DEMUXER_CTRL_GET_TIME_LENGTH:
	    *((double *)arg)=(double)(asf->movielength);
	    return DEMUXER_CTRL_OK;

	case DEMUXER_CTRL_GET_PERCENT_POS:
		return DEMUXER_CTRL_DONTKNOW;

	default:
	    return DEMUXER_CTRL_NOTIMPL;
    }
}


static demuxer_t* demux_open_asf(demuxer_t* demuxer)
{
    struct asf_priv* asf = demuxer->priv;
    sh_audio_t *sh_audio=NULL;
    sh_video_t *sh_video=NULL;

    //---- ASF header:
    if(!asf) return NULL;
    init_priv(asf);
    if (!read_asf_header(demuxer,asf))
        return NULL;
    stream_reset(demuxer->stream);
    stream_seek(demuxer->stream,demuxer->movi_start);
//    demuxer->idx_pos=0;
//    demuxer->endpos=avi_header.movi_end;
    if(demuxer->video->id != -2) {
        if(!ds_fill_buffer(demuxer->video)){
            mp_msg(MSGT_DEMUXER,MSGL_WARN,"ASF: " MSGTR_MissingVideoStream);
            demuxer->video->sh=NULL;
            //printf("ASF: missing video stream!? contact the author, it may be a bug :(\n");
        } else {
            sh_video=demuxer->video->sh;sh_video->ds=demuxer->video;
            sh_video->fps=1000.0f; sh_video->frametime=0.001f;

            if (asf->asf_is_dvr_ms) {
                sh_video->bih->biWidth = 0;
                sh_video->bih->biHeight = 0;
            }
        }
    }

    if(demuxer->audio->id!=-2){
        mp_msg(MSGT_DEMUXER,MSGL_V,MSGTR_ASFSearchingForAudioStream,demuxer->audio->id);
        if(!ds_fill_buffer(demuxer->audio)){
            mp_msg(MSGT_DEMUXER,MSGL_INFO,"ASF: " MSGTR_MissingAudioStream);
            demuxer->audio->sh=NULL;
        } else {
            sh_audio=demuxer->audio->sh;sh_audio->ds=demuxer->audio;
            sh_audio->format=sh_audio->wf->wFormatTag;
        }
    }
    if(!demuxer->stream->seek)
        demuxer->seekable=0;

    return demuxer;
}


static void demux_close_asf(demuxer_t *demuxer) {
    struct asf_priv* asf = demuxer->priv;

    if (!asf) return;

    if (asf->aud_repdata_sizes)
      free(asf->aud_repdata_sizes);
      
    if (asf->vid_repdata_sizes)
      free(asf->vid_repdata_sizes);
      
    free(asf);
}

demuxer_desc_t demuxer_desc_asf = {
  "ASF demuxer",
  "asf",
  "ASF",
  "A'rpi",
  "ASF, WMV, WMA",
  DEMUXER_TYPE_ASF,
  1, // safe autodetect
  asf_check_header,
  demux_asf_fill_buffer,
  demux_open_asf,
  demux_close_asf,
  demux_seek_asf,
  demux_asf_control
};