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|
// MPG/VOB file parser for DEMUXER v2.5 by A'rpi/ESP-team
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <math.h>
#include "config.h"
#include "mp_msg.h"
#include "help_mp.h"
#include "stream/stream.h"
#include "demuxer.h"
#include "parse_es.h"
#include "stheader.h"
#include "mp3_hdr.h"
//#define MAX_PS_PACKETSIZE 2048
#define MAX_PS_PACKETSIZE (224*1024)
#define UNKNOWN 0
#define VIDEO_MPEG1 0x10000001
#define VIDEO_MPEG2 0x10000002
#define VIDEO_MPEG4 0x10000004
#define VIDEO_H264 0x10000005
#define AUDIO_MP2 0x50
#define AUDIO_A52 0x2000
#define AUDIO_LPCM_BE 0x10001
#define AUDIO_AAC mmioFOURCC('M', 'P', '4', 'A')
typedef struct mpg_demuxer {
float last_pts;
float first_pts; // first pts found in stream
float first_to_final_pts_len; // difference between final pts and first pts
int has_valid_timestamps; // !=0 iff time stamps look linear
// (not necessarily starting with 0)
unsigned int es_map[0x40]; //es map of stream types (associated to the pes id) from 0xb0 to 0xef
int num_a_streams;
int a_stream_ids[MAX_A_STREAMS];
} mpg_demuxer_t;
extern char* dvdsub_lang;
static int mpeg_pts_error=0;
off_t ps_probe = 0;
static int parse_psm(demuxer_t *demux, int len) {
unsigned char c, id, type;
unsigned int plen, prog_len, es_map_len;
mpg_demuxer_t *priv = (mpg_demuxer_t *) demux->priv;
mp_dbg(MSGT_DEMUX,MSGL_V, "PARSE_PSM, len=%d\n", len);
if(! len || len > 1018)
return 0;
c = stream_read_char(demux->stream);
if(! (c & 0x80)) {
stream_skip(demux->stream, len - 1); //not yet valid, discard
return 0;
}
stream_skip(demux->stream, 1);
prog_len = stream_read_word(demux->stream); //length of program descriptors
stream_skip(demux->stream, prog_len); //.. that we ignore
es_map_len = stream_read_word(demux->stream); //length of elementary streams map
es_map_len = FFMIN(es_map_len, len - prog_len - 8); //sanity check
while(es_map_len > 0) {
type = stream_read_char(demux->stream);
id = stream_read_char(demux->stream);
if(id >= 0xB0 && id <= 0xEF && priv) {
int idoffset = id - 0xB0;
switch(type) {
case 0x1:
priv->es_map[idoffset] = VIDEO_MPEG1;
break;
case 0x2:
priv->es_map[idoffset] = VIDEO_MPEG2;
break;
case 0x3:
case 0x4:
priv->es_map[idoffset] = AUDIO_MP2;
break;
case 0x0f:
case 0x11:
priv->es_map[idoffset] = AUDIO_AAC;
break;
case 0x10:
priv->es_map[idoffset] = VIDEO_MPEG4;
break;
case 0x1b:
priv->es_map[idoffset] = VIDEO_H264;
break;
case 0x81:
priv->es_map[idoffset] = AUDIO_A52;
break;
}
mp_dbg(MSGT_DEMUX,MSGL_V, "PSM ES, id=0x%x, type=%x, stype: %x\n", id, type, priv->es_map[idoffset]);
}
plen = stream_read_word(demux->stream); //length of elementary stream descriptors
plen = FFMIN(plen, es_map_len); //sanity check
stream_skip(demux->stream, plen); //skip descriptors for now
es_map_len -= 4 + plen;
}
stream_skip(demux->stream, 4); //skip crc32
return 1;
}
// 500000 is a wild guess
#define TIMESTAMP_PROBE_LEN 500000
//MAX_PTS_DIFF_FOR_CONSECUTIVE denotes the maximum difference
//between two pts to consider them consecutive
//1.0 is a wild guess
#define MAX_PTS_DIFF_FOR_CONSECUTIVE 1.0
//returns the first pts found within TIME_STAMP_PROBE_LEN bytes after stream_pos in demuxer's stream.
//if no pts is found or an error occurs, -1.0 is returned.
//Packs are freed.
static float read_first_mpeg_pts_at_position(demuxer_t* demuxer, off_t stream_pos)
{
stream_t *s = demuxer->stream;
mpg_demuxer_t *mpg_d = demuxer->priv;
float pts = -1.0; //the pts to return;
float found_pts1; //the most recently found pts
float found_pts2; //the pts found before found_pts1
float found_pts3; //the pts found before found_pts2
int found = 0;
if(!mpg_d || stream_pos < 0)
return pts;
found_pts3 = found_pts2 = found_pts1 = mpg_d->last_pts;
stream_seek(s, stream_pos);
//We look for pts.
//However, we do not stop at the first found one, as timestamps may reset
//Therefore, we seek until we found three consecutive
//pts within MAX_PTS_DIFF_FOR_CONSECUTIVE.
while(found<3 && !s->eof
&& (fabsf(found_pts2-found_pts1) < MAX_PTS_DIFF_FOR_CONSECUTIVE)
&& (fabsf(found_pts3-found_pts2) < MAX_PTS_DIFF_FOR_CONSECUTIVE)
&& (stream_tell(s) < stream_pos + TIMESTAMP_PROBE_LEN)
&& ds_fill_buffer(demuxer->video))
{
if(mpg_d->last_pts != found_pts1)
{
if(!found)
found_pts3 = found_pts2 = found_pts1 = mpg_d->last_pts; //the most recently found pts
else
{
found_pts3 = found_pts2;
found_pts2 = found_pts1;
found_pts1 = mpg_d->last_pts;
}
found++;
}
}
if(found == 3) pts = found_pts3;
//clean up from searching of first pts;
demux_flush(demuxer);
return pts;
}
/// Open an mpg physical stream
static demuxer_t* demux_mpg_open(demuxer_t* demuxer) {
stream_t *s = demuxer->stream;
mpg_demuxer_t* mpg_d;
if (!ds_fill_buffer(demuxer->video)) return 0;
mpg_d = calloc(1,sizeof(mpg_demuxer_t));
if(mpg_d)
{
demuxer->priv = mpg_d;
mpg_d->last_pts = -1.0;
mpg_d->first_pts = -1.0;
//if seeking is allowed set has_valid_timestamps if appropriate
if(demuxer->seekable
&& (demuxer->stream->type == STREAMTYPE_FILE
|| demuxer->stream->type == STREAMTYPE_VCD)
&& demuxer->movi_start != demuxer-> movi_end
)
{
//We seek to the beginning of the stream, to somewhere in the
//middle, and to the end of the stream, while remembering the pts
//at each of the three positions. With these pts, we check whether
//or not the pts are "linear enough" to justify seeking by the pts
//of the stream
//The position where the stream is now
off_t pos = stream_tell(s);
float first_pts = read_first_mpeg_pts_at_position(demuxer, demuxer->movi_start);
if(first_pts != -1.0)
{
float middle_pts = read_first_mpeg_pts_at_position(demuxer, (demuxer->movi_end + demuxer->movi_start)/2);
if(middle_pts != -1.0)
{
float final_pts = read_first_mpeg_pts_at_position(demuxer, demuxer->movi_end - TIMESTAMP_PROBE_LEN);
if(final_pts != -1.0)
{
// found proper first, middle, and final pts.
float proportion = (middle_pts-first_pts==0) ? -1 : (final_pts-middle_pts)/(middle_pts-first_pts);
// if they are linear enough set has_valid_timestamps
if((0.5 < proportion) && (proportion < 2))
{
mpg_d->first_pts = first_pts;
mpg_d->first_to_final_pts_len = final_pts - first_pts;
mpg_d->has_valid_timestamps = 1;
}
}
}
}
//Cleaning up from seeking in stream
demuxer->stream->eof=0;
demuxer->video->eof=0;
demuxer->audio->eof=0;
stream_seek(s,pos);
ds_fill_buffer(demuxer->video);
} // if ( demuxer->seekable )
} // if ( mpg_d )
return demuxer;
}
static void demux_close_mpg(demuxer_t* demuxer) {
mpg_demuxer_t* mpg_d = demuxer->priv;
if (mpg_d) free(mpg_d);
}
static unsigned long long read_mpeg_timestamp(stream_t *s,int c){
unsigned int d,e;
unsigned long long pts;
d=stream_read_word(s);
e=stream_read_word(s);
if( ((c&1)!=1) || ((d&1)!=1) || ((e&1)!=1) ){
++mpeg_pts_error;
return 0; // invalid pts
}
pts=(((uint64_t)((c>>1)&7))<<30)|((d>>1)<<15)|(e>>1);
mp_dbg(MSGT_DEMUX,MSGL_DBG3," pts {%"PRIu64"}",pts);
return pts;
}
static void new_audio_stream(demuxer_t *demux, int aid){
if(!demux->a_streams[aid]){
mpg_demuxer_t *mpg_d=(mpg_demuxer_t*)demux->priv;
sh_audio_t* sh_a;
new_sh_audio(demux,aid);
sh_a = (sh_audio_t*)demux->a_streams[aid];
switch(aid & 0xE0){ // 1110 0000 b (high 3 bit: type low 5: id)
case 0x00: sh_a->format=0x50;break; // mpeg
case 0xA0: sh_a->format=0x10001;break; // dvd pcm
case 0x80: if((aid & 0xF8) == 0x88) sh_a->format=0x2001;//dts
else sh_a->format=0x2000;break; // ac3
}
//evo files
if((aid & 0xC0) == 0xC0) sh_a->format=0x2000;
else if(aid >= 0x98 && aid <= 0x9f) sh_a->format=0x2001;
if (mpg_d) mpg_d->a_stream_ids[mpg_d->num_a_streams++] = aid;
}
if(demux->audio->id==-1) demux->audio->id=aid;
}
static int demux_mpg_read_packet(demuxer_t *demux,int id){
int d;
int len;
int set_pts=0; // !=0 iff pts has been set to a proper value
unsigned char c=0;
unsigned long long pts=0;
unsigned long long dts=0;
int l;
int pes_ext2_subid=-1;
double stream_pts = MP_NOPTS_VALUE;
demux_stream_t *ds=NULL;
demux_packet_t* dp;
mpg_demuxer_t *priv = (mpg_demuxer_t *) demux->priv;
mp_dbg(MSGT_DEMUX,MSGL_DBG3,"demux_read_packet: %X\n",id);
// if(id==0x1F0){
// demux->synced=0; // force resync after 0x1F0
// return -1;
//}
// if(id==0x1BA) packet_start_pos=stream_tell(demux->stream);
if((id<0x1BC || id>=0x1F0) && id != 0x1FD) return -1;
if(id==0x1BE) return -1; // padding stream
if(id==0x1BF) return -1; // private2
len=stream_read_word(demux->stream);
mp_dbg(MSGT_DEMUX,MSGL_DBG3,"PACKET len=%d",len);
// if(len==62480){ demux->synced=0;return -1;} /* :) */
if(len==0 || len>MAX_PS_PACKETSIZE){
mp_dbg(MSGT_DEMUX,MSGL_DBG2,"Invalid PS packet len: %d\n",len);
return -2; // invalid packet !!!!!!
}
mpeg_pts_error=0;
if(id==0x1BC) {
parse_psm(demux, len);
return 0;
}
while(len>0){ // Skip stuFFing bytes
c=stream_read_char(demux->stream);
--len;
if(c!=0xFF)break;
}
if((c>>6)==1){ // Read (skip) STD scale & size value
// printf(" STD_scale=%d",(c>>5)&1);
d=((c&0x1F)<<8)|stream_read_char(demux->stream);
len-=2;
// printf(" STD_size=%d",d);
c=stream_read_char(demux->stream);
}
// Read System-1 stream timestamps:
if((c>>4)==2){
pts=read_mpeg_timestamp(demux->stream,c);
set_pts=1;
len-=4;
} else
if((c>>4)==3){
pts=read_mpeg_timestamp(demux->stream,c);
c=stream_read_char(demux->stream);
if((c>>4)!=1) pts=0; //printf("{ERROR4}");
else set_pts = 1;
dts=read_mpeg_timestamp(demux->stream,c);
len-=4+1+4;
} else
if((c>>6)==2){
int pts_flags;
int hdrlen;
int parse_ext2;
// System-2 (.VOB) stream:
c=stream_read_char(demux->stream);
pts_flags=c>>6;
parse_ext2 = (id == 0x1FD) && ((c & 0x3F) == 1);
c=stream_read_char(demux->stream);
hdrlen=c;
len-=2;
mp_dbg(MSGT_DEMUX,MSGL_DBG3," hdrlen=%d (len=%d)",hdrlen,len);
if(hdrlen>len){ mp_msg(MSGT_DEMUX,MSGL_V,"demux_mpg: invalid header length \n"); return -1;}
if(pts_flags==2 && hdrlen>=5){
c=stream_read_char(demux->stream);
pts=read_mpeg_timestamp(demux->stream,c);
set_pts=1;
len-=5;hdrlen-=5;
} else
if(pts_flags==3 && hdrlen>=10){
c=stream_read_char(demux->stream);
pts=read_mpeg_timestamp(demux->stream,c);
set_pts=1;
c=stream_read_char(demux->stream);
dts=read_mpeg_timestamp(demux->stream,c);
len-=10;hdrlen-=10;
}
len-=hdrlen;
if(parse_ext2 && hdrlen>=3) {
c=stream_read_char(demux->stream);
hdrlen--;
if((c & 0x0F) != 0x0F) {
mp_msg(MSGT_DEMUX,MSGL_V,"demux_mpg: pes_extension_flag2 not set, discarding pes packet\n");
return -1;
}
if(c & 0x80) { //pes_private_data_flag
if(hdrlen<16) {
mp_msg(MSGT_DEMUX,MSGL_V,"demux_mpg: not enough pes_private_data bytes: %d < 16, discarding pes packet\n", hdrlen);
return -1;
}
stream_skip(demux->stream, 16);
hdrlen-=16;
}
if(c & 0x40) { //pack_header_field_flag
int l = stream_read_char(demux->stream);
if(l < 0) //couldn't read from the stream?
return -1;
hdrlen--;
if(l < 0 || hdrlen < l) {
mp_msg(MSGT_DEMUX,MSGL_V,"demux_mpg: not enough pack_header bytes: hdrlen: %d < skip: %d, discarding pes packet\n",
hdrlen, l);
return -1;
}
stream_skip(demux->stream, l);
hdrlen-=l;
}
if(c & 0x20) { //program_packet_sequence_counter_flag
if(hdrlen < 2) {
mp_msg(MSGT_DEMUX,MSGL_V,"demux_mpg: not enough program_packet bytes: hdrlen: %d, discarding pes packet\n", hdrlen);
return -1;
}
stream_skip(demux->stream, 2);
hdrlen-=2;
}
if(c & 0x10) {
//STD
stream_skip(demux->stream, 2);
hdrlen-=2;
}
c=stream_read_char(demux->stream); //pes_extension2 flag
hdrlen--;
if(c!=0x81) { mp_msg(MSGT_DEMUX,MSGL_V,"demux_mpg: unknown pes_extension2 format, len is > 1 \n"); return -1;}
c=stream_read_char(demux->stream); //pes_extension2 payload === substream id
hdrlen--;
if(c<0x55 || c>0x5F) { mp_msg(MSGT_DEMUX,MSGL_V,"demux_mpg: unknown vc1 substream_id: 0x%x \n", c); return -1;}
pes_ext2_subid=c;
}
if(hdrlen>0)
stream_skip(demux->stream,hdrlen); // skip header and stuffing bytes
if(id==0x1FD && pes_ext2_subid!=-1) {
//==== EVO VC1 STREAMS ===//
if(!demux->v_streams[pes_ext2_subid]) new_sh_video(demux,pes_ext2_subid);
if(demux->video->id==-1) demux->video->id=pes_ext2_subid;
if(demux->video->id==pes_ext2_subid){
ds=demux->video;
if(!ds->sh) ds->sh=demux->v_streams[pes_ext2_subid];
if(priv && ds->sh) {
sh_video_t *sh = (sh_video_t *)ds->sh;
sh->format = mmioFOURCC('W', 'V', 'C', '1');
}
}
}
//============== DVD Audio sub-stream ======================
if(id==0x1BD){
int aid, rawa52 = 0;
off_t tmppos;
unsigned int tmp;
tmppos = stream_tell(demux->stream);
tmp = stream_read_word(demux->stream);
stream_seek(demux->stream, tmppos);
/// vdr stores A52 without the 4 header bytes, so we have to check this condition first
if(tmp == 0x0B77) {
aid = 128;
rawa52 = 1;
}
else {
aid=stream_read_char(demux->stream);--len;
if(len<3) return -1; // invalid audio packet
}
// AID:
// 0x20..0x3F subtitle
// 0x80..0x87 and 0xC0..0xCF AC3 audio
// 0x88..0x8F and 0x98..0x9F DTS audio
// 0xA0..0xBF PCM audio
if((aid & 0xE0) == 0x20){
// subtitle:
aid&=0x1F;
if(!demux->s_streams[aid]){
sh_sub_t *sh = new_sh_sub(demux, aid);
if (sh) sh->type = 'v';
mp_msg(MSGT_DEMUX,MSGL_V,"==> Found subtitle: %d\n",aid);
}
if(demux->sub->id > -1)
demux->sub->id &= 0x1F;
if(!dvdsub_lang && demux->sub->id == -1)
demux->sub->id = aid;
if(demux->sub->id==aid){
ds=demux->sub;
}
} else if((aid >= 0x80 && aid <= 0x8F) || (aid >= 0x98 && aid <= 0xAF) || (aid >= 0xC0 && aid <= 0xCF)) {
// aid=128+(aid&0x7F);
// aid=0x80..0xBF
new_audio_stream(demux, aid);
if(demux->audio->id==aid){
int type;
ds=demux->audio;
if(!ds->sh) ds->sh=demux->a_streams[aid];
// READ Packet: Skip additional audio header data:
if(!rawa52) {
c=stream_read_char(demux->stream);//num of frames
type=stream_read_char(demux->stream);//startpos hi
type=(type<<8)|stream_read_char(demux->stream);//startpos lo
// printf("\r[%02X][%04X]",c,type);
len-=3;
}
if((aid&0xE0)==0xA0 && len>=3){
unsigned char* hdr;
// save audio header as codecdata!
if(!((sh_audio_t*)(ds->sh))->codecdata_len){
((sh_audio_t*)(ds->sh))->codecdata=malloc(3);
((sh_audio_t*)(ds->sh))->codecdata_len=3;
}
hdr=((sh_audio_t*)(ds->sh))->codecdata;
// read LPCM header:
// emphasis[1], mute[1], rvd[1], frame number[5]:
hdr[0]=stream_read_char(demux->stream);
// printf(" [%01X:%02d]",c>>5,c&31);
// quantization[2],freq[2],rvd[1],channels[3]
hdr[1]=stream_read_char(demux->stream);
// printf("[%01X:%01X] ",c>>4,c&15);
// dynamic range control (0x80=off):
hdr[2]=stream_read_char(demux->stream);
// printf("[%02X] ",c);
len-=3;
if(len<=0) mp_msg(MSGT_DEMUX,MSGL_V,"End of packet while searching for PCM header\n");
}
// printf(" \n");
} // if(demux->audio->id==aid)
} else mp_msg(MSGT_DEMUX,MSGL_V,"Unknown 0x1BD substream: 0x%02X \n",aid);
} //if(id==0x1BD)
} else {
if(c!=0x0f){
mp_msg(MSGT_DEMUX,MSGL_V," {ERROR5,c=%d} \n",c);
return -1; // invalid packet !!!!!!
}
}
if(mpeg_pts_error) mp_msg(MSGT_DEMUX,MSGL_V," {PTS_err:%d} \n",mpeg_pts_error);
mp_dbg(MSGT_DEMUX,MSGL_DBG3," => len=%d\n",len);
// if(l
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