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mpv/libmpdemux/demux_asf.c
iive 9b4c7840b9 fix descrambling of asf file, 
where signed buffer could cause erroneous values to be filled in descrable variables,
add misssing check for one of these variables
and restore sign of these variables as insurance that these checks will work even in such case.


git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@18002 b3059339-0415-0410-9bf9-f77b7e298cf2
2006-03-30 23:06:18 +00:00

499 lines
15 KiB
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"
#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))
#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 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++){
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);
free(*src);
*src = dst;
}
#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 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){
struct asf_priv* asf = demux->priv;
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->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_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+FF_INPUT_BUFFER_PADDING_SIZE);
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;
// 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
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;
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;
unsigned int time2=0;
int keyframe=0;
if(p>=p_end) mp_msg(MSGT_DEMUX,MSGL_V,"Warning! invalid packet 1, sig11 coming soon...\n");
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
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);
}
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);
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 steve@daviesfam.org 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 (d_video->id >= 0)
ds_fill_buffer(d_video);
if(sh_audio){
ds_fill_buffer(d_audio);
}
if (d_video->id < 0)
sh_audio->delay = d_audio->pts;
else
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;
if (!read_asf_header(demuxer,asf)) {
free(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; // 1ms
//sh_video->i_bps=10*asf->packetsize; // FIXME!
}
}
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;
}
}
return demuxer;
}
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,
NULL, //demux_close_asf,
demux_seek_asf,
demux_asf_control
};
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