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mpv/libmpdemux/demux_asf.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"
#define ASFMIN(a,b) ((a) > (b) ? (b) : (a))
#define SLICE_MIN_START_CODE 0x00000101
#define SLICE_MAX_START_CODE 0x000001af
#define END_NOT_FOUND -100
/*
* 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++){
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 const uint8_t *find_start_code(const uint8_t * restrict p, const uint8_t *end, uint32_t * restrict state){
int i;
if(p>=end)
return end;
for(i=0; i<3; i++){
uint32_t tmp= *state << 8;
*state= tmp + *(p++);
if(tmp == 0x100 || p==end)
return p;
}
while(p<end){
if (p[-1] > 1 ) p+= 3;
else if(p[-2] ) p+= 2;
else if(p[-3]|(p[-1]-1)) p++;
else{
p++;
break;
}
}
p= ASFMIN(p, end)-4;
*state= LOAD_BE32(p);
return p+4;
}
static int mpeg1_find_frame_end(demuxer_t *demux, const uint8_t *buf, int buf_size)
{
int i;
struct asf_priv* asf = demux->priv;
i=0;
if(!asf->asf_frame_start_found){
for(i=0; i<buf_size; i++){
i= find_start_code(buf+i, buf+buf_size, &asf->asf_frame_state) - buf - 1;
if(asf->asf_frame_state >= SLICE_MIN_START_CODE && asf->asf_frame_state <= SLICE_MAX_START_CODE){
i++;
asf->asf_frame_start_found=1;
break;
}
}
}
if(asf->asf_frame_start_found){
/* EOF considered as end of frame */
if (buf_size == 0)
return 0;
for(; i<buf_size; i++){
i= find_start_code(buf+i, buf+buf_size, &asf->asf_frame_state) - buf - 1;
if((asf->asf_frame_state&0xFFFFFF00) == 0x100){
//if NOT in range 257 - 431
if(asf->asf_frame_state < SLICE_MIN_START_CODE || asf->asf_frame_state > SLICE_MAX_START_CODE){
asf->asf_frame_start_found=0;
asf->asf_frame_state=-1;
return i-3;
}
}
}
}
return END_NOT_FOUND;
}
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);
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,unsigned long time,unsigned short dur,int offs,int keyframe){
struct asf_priv* asf = demux->priv;
demux_stream_t *ds=NULL;
int close_seg=0;
int frame_end_pos=END_NOT_FOUND;
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) {
frame_end_pos=mpeg1_find_frame_end(demux, data, len);
if (frame_end_pos != END_NOT_FOUND) {
dp->pos=demux->filepos;
if (frame_end_pos > 0) {
demux_asf_append_to_packet(dp,data,frame_end_pos,offs);
data += frame_end_pos;
len -= frame_end_pos;
}
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);
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)
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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