demux_asf.c

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//  ASF file parser for DEMUXER v0.3  by A'rpi/ESP-team

#include <mplaylib.h>
#include <mplaylib.h>
#include <mplaylib.h>

#include "config.h"
#include "mp_msg.h"
#include "help_mp.h"

#include "stream/stream.h"
#include "asf.h"
#include "demuxer.h"

#include "libvo/fastmemcpy.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))
#define	LOAD_BE32(p)	(((unsigned char*)(p))[3]     | \
 			 ((unsigned char*)(p))[2]<< 8 | \
 			 ((unsigned char*)(p))[1]<<16 | \
 			 ((unsigned char*)(p))[0]<<24 )
#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)
#define	LOAD_BE32(p)	(*(unsigned int*)(p))
#endif

// defined at asfheader.c:

extern int asf_check_header(demuxer_t *demuxer);
extern int read_asf_header(demuxer_t *demuxer,struct asf_priv* asf);

// based on asf file-format doc by Eugene [http://divx.euro.ru]

static void asf_descrambling(unsigned char **src,unsigned len, struct asf_priv* asf){
  unsigned char *dst=malloc(len);
  unsigned char *s2=*src;
  unsigned i=0,x,y;
  while(len>=asf->scrambling_h*asf->scrambling_w*asf->scrambling_b+i){
//    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++){
	    fast_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) fast_memcpy(dst+i,src+i,len-i);
  free(*src);
  *src = dst;
}

/*****************************************************************
 * \brief initializes asf private data
 *
 */
static void init_priv (struct asf_priv* asf){
  asf->last_vid_seq=-1;
  asf->vid_ext_timing_index=-1;
  asf->aud_ext_timing_index=-1;
  asf->vid_ext_frame_index=-1;
}

#ifdef USE_LIBAVCODEC_SO
#include <ffmpeg/avcodec.h>
#elif defined(USE_LIBAVCODEC)
#include "libavcodec/avcodec.h"
#else
#define FF_INPUT_BUFFER_PADDING_SIZE 8
#endif


static void demux_asf_append_to_packet(demux_packet_t* dp,unsigned char *data,int len,int offs)
{
  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+FF_INPUT_BUFFER_PADDING_SIZE);
  fast_memcpy(dp->buffer+dp->len,data,len);
  memset(dp->buffer+dp->len+len, 0, FF_INPUT_BUFFER_PADDING_SIZE);
  mp_dbg(MSGT_DEMUX,MSGL_DBG4,"data appended! %d+%d\n",dp->len,len);
  dp->len+=len;
}

static int demux_asf_read_packet(demuxer_t *demux,unsigned char *data,int len,int id,int seq,uint64_t time,unsigned short dur,int offs,int keyframe){
  struct asf_priv* asf = demux->priv;
  demux_stream_t *ds=NULL;
  int close_seg=0;
  
  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){
      demux_packet_t* dp=ds->asf_packet;

      if (ds==demux->video && asf->asf_is_dvr_ms) {
        if (asf->new_vid_frame_seg) {
          dp->pos=demux->filepos;
          close_seg = 1;
        } else seq = ds->asf_seq;
      } else close_seg = ds->asf_seq!=seq;

      if(close_seg){
        // closed segment, finalize packet:
		if(ds==demux->audio)
		  if(asf->scrambling_h>1 && asf->scrambling_w>1 && asf->scrambling_b>0)
		    asf_descrambling(&ds->asf_packet->buffer,ds->asf_packet->len,asf);
        ds_add_packet(ds,ds->asf_packet);
        ds->asf_packet=NULL;
      } else {
        // append data to it!
        demux_asf_append_to_packet(dp,data,len,offs);
        // 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);
      fast_memcpy(dp->buffer,data,len);
      if (asf->asf_is_dvr_ms)
        dp->pts=time*0.0000001;
      else
        dp->pts=time*0.001;
      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;
}

/*****************************************************************
 * \brief read the replicated data associated with each segment
 * \parameter pp reference to replicated data
 * \parameter id stream number
 * \parameter seq media object number
 * \parameter keyframe key frame indicator - set to zero if keyframe, non-zero otherwise
 * \parameter seg_time set to payload time when valid, if audio or new video frame payload, zero otherwise
 *
 */
static void get_payload_extension_data(demuxer_t *demux, unsigned char** pp, unsigned char id, unsigned int seq, int *keyframe, uint64_t *seg_time){
    struct asf_priv* asf = demux->priv;
    uint64_t payload_time; //100ns units
    int i, ext_max, ext_timing_index;
    uint8_t *pi = *pp+4;

    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->video->id && id!=demux->audio->id) return;

    if (id==demux->video->id) {
      ext_max = asf->vid_repdata_count;
      ext_timing_index = asf->vid_ext_timing_index;
    } else {
      ext_max = asf->aud_repdata_count;
      ext_timing_index = asf->aud_ext_timing_index;
    }

    *seg_time=0.0;
    asf->new_vid_frame_seg = 0;

    for (i=0; i<ext_max; i++) {    
        uint16_t payextsize;
        uint8_t segment_marker;

        if (id==demux->video->id)
            payextsize = asf->vid_repdata_sizes[i];
        else
            payextsize = asf->aud_repdata_sizes[i];

        if (payextsize == 65535) {
            payextsize = LOAD_LE16(pi);
            pi+=2;
        }
       
        // if this is the timing info extension then read the payload time
        if (i == ext_timing_index)
            payload_time =  (uint64_t) LOAD_LE32(pi+8) | (uint64_t)LOAD_LE32(pi+8 + 4) << 32;
        
        // if this is the video frame info extension then 
        // set the keyframe indicator, the 'new frame segment' indicator
        // and (initially) the 'frame time'
        if (i == asf->vid_ext_frame_index && id==demux->video->id) {
            segment_marker = pi[0];
            // Known video stream segment_marker values that
            // contain useful information:
            //
            // NTSC/ATSC (29.97fps):        0X4A 01001010
            //                              0X4B 01001011
            //                              0X49 01001001
            //
            // PAL/ATSC (25fps):            0X3A 00111010
            //                              0X3B 00111011
            //                              0X39 00111001
            //
            // ATSC progressive (29.97fps): 0X7A 01111010
            //                              0X7B 01111011
            //                              0X79 01111001
            //   11111111
            //       ^    this is new video frame marker
            //
            //   ^^^^     these bits indicate the framerate
            //            0X4 is 29.97i, 0X3 is 25i, 0X7 is 29.97p, ???=25p 
            //
            //        ^^^ these bits indicate the frame type:
            //              001 means I-frame
            //              010 and 011 probably mean P and B

            asf->new_vid_frame_seg = (0X08 & segment_marker) && seq != asf->last_vid_seq;

            if (asf->new_vid_frame_seg) asf->last_vid_seq = seq;

            if (asf->avg_vid_frame_time == 0) {
                // set the average frame time initially (in 100ns units). 
                // This is based on what works for known samples.
                // It can be extended if more samples of different types can be obtained.
                if (((segment_marker & 0XF0) >> 4) == 4) {
                    asf->avg_vid_frame_time = (uint64_t)((1.001 / 30.0) * 10000000.0);
                    asf->know_frame_time=1;
                } else if (((segment_marker & 0XF0) >> 4) == 3) {
                    asf->avg_vid_frame_time = (uint64_t)(0.04 * 10000000.0);
                    asf->know_frame_time=1;
                } else if (((segment_marker & 0XF0) >> 4) == 6) {
                    asf->avg_vid_frame_time = (uint64_t)(0.02 * 10000000.0);
                    asf->know_frame_time=1;
                } else if (((segment_marker & 0XF0) >> 4) == 7) {
                    asf->avg_vid_frame_time = (uint64_t)((1.001 / 60.0) * 10000000.0);
                    asf->know_frame_time=1;
                } else {
                    // we dont know the frame time initially so 
                    // make a guess and then recalculate as we go.
                    asf->avg_vid_frame_time = (uint64_t)((1.001 / 60.0) * 10000000.0); 
                    asf->know_frame_time=0;
                }
            }
            *keyframe = (asf->new_vid_frame_seg && (segment_marker & 0X07) == 1);
        }
        pi +=payextsize;
    }

    if (id==demux->video->id && asf->new_vid_frame_seg) {    
        asf->vid_frame_ct++;
        // Some samples only have timings on key frames and 
        // the rest contain non-cronological timestamps. Interpolating
        // the values between key frames works for all samples.
        if (*keyframe) {
            asf->found_first_key_frame=1;
            if (!asf->know_frame_time && asf->last_key_payload_time > 0) {
                // We dont know average frametime so recalculate.
                // Giving precedence to the 'weight' of the existing
                // average limits damage done to new value when there is
                // a sudden time jump which happens occasionally.
                asf->avg_vid_frame_time = 
                   (0.9 * asf->avg_vid_frame_time) +
                   (0.1 * ((payload_time - asf->last_key_payload_time) / asf->vid_frame_ct));
            }
            asf->last_key_payload_time = payload_time;
            asf->vid_frame_ct = 1;
            *seg_time = payload_time;
        } else
            *seg_time = (asf->last_key_payload_time  + (asf->avg_vid_frame_time * (asf->vid_frame_ct-1)));
    }

    if (id==demux->audio->id) {
        if (payload_time != -1)
            asf->last_aud_diff = payload_time - asf->last_aud_pts;
        asf->last_aud_pts += asf->last_aud_diff;
        *seg_time = asf->last_aud_pts;
   }
}
//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
static int demux_asf_fill_buffer(demuxer_t *demux, demux_stream_t *ds){
  struct asf_priv* asf = demux->priv;

  demux->filepos=stream_tell(demux->stream);
  // Brodcast stream have movi_start==movi_end
  // Better test ?
  if((demux->movi_start < demux->movi_end) && (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
    
    {
	    unsigned char* p=asf->packet;
            unsigned char* p_end=asf->packet+asf->packetsize;
            unsigned char flags=p[0];
            unsigned char segtype=p[1];
            unsigned padding;
            unsigned plen;
	    unsigned sequence;
            unsigned long time=0;
            unsigned short duration=0;

            int segs=1;
            unsigned char segsizetype=0x80;
            int seg=-1;