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mpv/libmpdemux/demux_nsv.c
rtognimp b79c4cc293 Fix nsv detection with new demuxer structure 
With old method there was an hack to skip detection for streamed nsv,
because demuxer did the chek only on first 4 bytes and live nsv streams
starts at random place in the file. The detection code was changed to
search for nsv signature in the first 64k of the file.
The check was changed to "unsafe" and thus moved later because now is
more expensive.


git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@16319 b3059339-0415-0410-9bf9-f77b7e298cf2
2005-08-30 19:06:55 +00:00

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/*
* Nullsoft Streaming Video demuxer
* for MPlayer
* by Reza Jelveh <reza.jelveh@tuhh.de>
* seeking and PCM audio not yet supported
* PCM needs extra audio chunk "miniheader" parsing
* Based on A'rpis G2 work
* Licence: GPL
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "config.h"
#include "mp_msg.h"
#include "help_mp.h"
#include "stream.h"
#include "demuxer.h"
#include "stheader.h"
typedef struct {
float v_pts;
int video_pack_no;
unsigned int a_format;
unsigned int v_format;
unsigned char fps;
} nsv_priv_t;
#define HEADER_SEARCH_SIZE 65000
/**
* Seeking still to be implemented
*/
static void demux_seek_nsv ( demuxer_t *demuxer, float rel_seek_secs, int flags )
{
// seeking is not yet implemented
}
static int demux_nsv_fill_buffer ( demuxer_t *demuxer, demux_stream_t *ds )
{
unsigned char hdr[17];
// for the extra data
unsigned char aux[6];
int i_aux = 0;
// videolen = audio chunk length, audiolen = video chunk length
int videolen,audiolen;
sh_video_t *sh_video = demuxer->video->sh;
sh_audio_t *sh_audio = demuxer->audio->sh;
nsv_priv_t * priv = demuxer->priv;
// if the audio/video chunk has no new header the first 2 bytes will be discarded 0xBEEF
// or rather 0xEF 0xBE
stream_read(demuxer->stream,hdr,7);
if(stream_eof(demuxer->stream)) return 0;
// sometimes instead of 0xBEEF as described for the next audio/video chunk we get
// a whole new header
mp_dbg(MSGT_DEMUX,MSGL_DBG2,"demux_nsv: %08X %08X\n",hdr[0]<<8|hdr[1],stream_tell(demuxer->stream));
switch(hdr[0]<<8|hdr[1]) {
case 0x4E53:
if(hdr[2]==0x56 && hdr[3]==0x73){
// NSVs
// get the header since there is no more metaheader after the first one
// there is no more need to skip that
stream_read(demuxer->stream,hdr+7,17-7);
stream_read(demuxer->stream,hdr,7);
}
break;
case 0xEFBE:
break;
default:
mp_dbg(MSGT_DEMUX,MSGL_WARN,"demux_nsv: sync lost\n");
break;
}
if (sh_video)
sh_video->pts = priv->v_pts =demuxer->video->pts= priv->video_pack_no *
(float)sh_video->frametime;
else
priv->v_pts = priv->video_pack_no;
demuxer->filepos=stream_tell(demuxer->stream);
mp_dbg(MSGT_DEMUX,MSGL_DBG2,"demux_nsv: %08X: %02X %02X | %02X %02X %02X | %02X %02X \n",
(int)demuxer->filepos, hdr[0],hdr[1],hdr[2],hdr[3],hdr[4],hdr[5],hdr[6]);
// read video:
videolen=(hdr[2]>>4)|(hdr[3]<<4)|(hdr[4]<<0xC);
//check if we got extra data like subtitles here
if( (hdr[2]&0x0f) != 0x0 ) {
stream_read( demuxer->stream, aux, 6);
i_aux = aux[0]|aux[1]<<8;
// We skip this extra data
stream_skip( demuxer->stream, i_aux );
i_aux+=6;
videolen -= i_aux;
}
// we need to return an empty packet when the
// video frame is empty otherwise the stream will fasten up
if(sh_video) {
if( (hdr[2]&0x0f) != 0x0 )
ds_read_packet(demuxer->video,demuxer->stream,videolen,priv->v_pts,demuxer->filepos-i_aux,0);
else
ds_read_packet(demuxer->video,demuxer->stream,videolen,priv->v_pts,demuxer->filepos,0);
}
else
stream_skip(demuxer->stream,videolen);
// read audio:
audiolen=(hdr[5])|(hdr[6]<<8);
// we need to return an empty packet when the
// audio frame is empty otherwise the stream will fasten up
if(sh_audio) {
ds_read_packet(demuxer->audio,demuxer->stream,audiolen,priv->v_pts,demuxer->filepos+videolen,0);
}
else
stream_skip(demuxer->stream,audiolen);
++priv->video_pack_no;
return 1;
}
static demuxer_t* demux_open_nsv ( demuxer_t* demuxer )
{
// last 2 bytes 17 and 18 are unknown but right after that comes the length
unsigned char hdr[17];
int videolen,audiolen;
unsigned char buf[10];
sh_video_t *sh_video = NULL;
sh_audio_t *sh_audio = NULL;
nsv_priv_t * priv = malloc(sizeof(nsv_priv_t));
demuxer->priv=priv;
priv->video_pack_no=0;
/* disable seeking yet to be fixed*/
demuxer->seekable = 0;
stream_read(demuxer->stream,hdr,4);
if(stream_eof(demuxer->stream)) return 0;
if(hdr[0]==0x4E && hdr[1]==0x53 && hdr[2]==0x56){
// NSV header!
if(hdr[3]==0x73){
// NSVs
stream_read(demuxer->stream,hdr+4,17-4);
}
if(hdr[3]==0x66){
// NSVf
int len=stream_read_dword_le(demuxer->stream);
// TODO: parse out metadata!!!!
stream_skip(demuxer->stream,len-8);
// NSVs
stream_read(demuxer->stream,hdr,17);
}
// dummy debug message
mp_msg(MSGT_DEMUX,MSGL_V,"demux_nsv: Header: %.12s\n",hdr);
// bytes 8-11 audio codec fourcc
// PCM fourcc needs extra parsing for every audio chunk, yet to implement
if((demuxer->audio->id != -2) && strncmp(hdr+8,"NONE", 4)){//&&strncmp(hdr+8,"VLB ", 4)){
sh_audio = new_sh_audio ( demuxer, 0 );
demuxer->audio->sh = sh_audio;
sh_audio->format=mmioFOURCC(hdr[8],hdr[9],hdr[10],hdr[11]);
sh_audio->ds = demuxer->audio;
priv->a_format=mmioFOURCC(hdr[8],hdr[9],hdr[10],hdr[11]);
}
// store hdr fps
priv->fps=hdr[16];
if ((demuxer->video->id != -2) && strncmp(hdr+4,"NONE", 4)) {
/* Create a new video stream header */
sh_video = new_sh_video ( demuxer, 0 );
/* Make sure the demuxer knows about the new video stream header
* (even though new_sh_video() ought to take care of it)
*/
demuxer->video->sh = sh_video;
/* Make sure that the video demuxer stream header knows about its
* parent video demuxer stream (this is getting wacky), or else
* video_read_properties() will choke
*/
sh_video->ds = demuxer->video;
// bytes 4-7 video codec fourcc
priv->v_format = sh_video->format=mmioFOURCC(hdr[4],hdr[5],hdr[6],hdr[7]);
// new video stream! parse header
sh_video->disp_w=hdr[12]|(hdr[13]<<8);
sh_video->disp_h=hdr[14]|(hdr[15]<<8);
sh_video->bih=(BITMAPINFOHEADER*)calloc(1,sizeof(BITMAPINFOHEADER));
sh_video->bih->biSize=sizeof(BITMAPINFOHEADER);
sh_video->bih->biPlanes=1;
sh_video->bih->biBitCount=24;
sh_video->bih->biWidth=hdr[12]|(hdr[13]<<8);
sh_video->bih->biHeight=hdr[14]|(hdr[15]<<8);
memcpy(&sh_video->bih->biCompression,hdr+4,4);
sh_video->bih->biSizeImage=sh_video->bih->biWidth*sh_video->bih->biHeight*3;
// here we search for the correct keyframe
// vp6 keyframe is when the 2nd byte of the vp6 header is
// 0x36 for VP61 and 0x46 for VP62
if((priv->v_format==mmioFOURCC('V','P','6','1')) ||
(priv->v_format==mmioFOURCC('V','P','6','2')) ||
(priv->v_format==mmioFOURCC('V','P','3','1'))) {
stream_read(demuxer->stream,buf,10);
if (((((priv->v_format>>16) & 0xff) == '6') && ((buf[8]&0x0e)!=0x06)) ||
((((priv->v_format>>16) & 0xff) == '3') && (buf[8]!=0x00 || buf[9]!=0x08))) {
mp_msg(MSGT_DEMUX,MSGL_V,"demux_nsv: searching %.4s keyframe...\n", (char*)&priv->v_format);
while(((((priv->v_format>>16) & 0xff) == '6') && ((buf[8]&0x0e)!=0x06)) ||
((((priv->v_format>>16) & 0xff) == '3') && (buf[8]!=0x00 || buf[9]!=0x08))){
mp_msg(MSGT_DEMUX,MSGL_DBG2,"demux_nsv: %.4s block skip.\n", (char*)&priv->v_format);
videolen=(buf[2]>>4)|(buf[3]<<4)|(buf[4]<<0xC);
audiolen=(buf[5])|(buf[6]<<8);
stream_skip(demuxer->stream, videolen+audiolen-3);
stream_read(demuxer->stream,buf,10);
if(stream_eof(demuxer->stream)) return 0;
if(buf[0]==0x4E){
mp_msg(MSGT_DEMUX,MSGL_DBG2,"demux_nsv: Got NSVs block.\n");
stream_skip(demuxer->stream,7);
stream_read(demuxer->stream,buf,10);
}
}
}
// data starts 10 bytes before current pos but later
// we seek 17 backwards
stream_skip(demuxer->stream,7);
}
switch(priv->fps){
case 0x80:
sh_video->fps=30;
break;
case 0x81:
sh_video->fps=(float)30000.0/1001.0;
break;
case 0x82:
sh_video->fps=25;
break;
case 0x83:
sh_video->fps=(float)24000.0/1001.0;
break;
case 0x85:
sh_video->fps=(float)15000.0/1001.0;
break;
case 0x89:
sh_video->fps=(float)10000.0/1001.0;
break;
default:
sh_video->fps = (float)priv->fps;
}
sh_video->frametime = (float)1.0 / (float)sh_video->fps;
}
}
// seek to start of NSV header
stream_seek(demuxer->stream,stream_tell(demuxer->stream)-17);
return demuxer;
}
static int nsv_check_file ( demuxer_t* demuxer )
{
unsigned char hdr;
int i;
/* Store original position */
// off_t orig_pos = stream_tell(demuxer->stream);
mp_msg ( MSGT_DEMUX, MSGL_V, "Checking for Nullsoft Streaming Video\n" );
for (i = 0; i < HEADER_SEARCH_SIZE; i++) {
if (stream_read_char(demuxer->stream) != 'N')
continue;
if(stream_eof(demuxer->stream))
return 0;
if (stream_read_char(demuxer->stream) != 'S')
continue;
if(stream_eof(demuxer->stream))
return 0;
if (stream_read_char(demuxer->stream) != 'V')
continue;
if(stream_eof(demuxer->stream))
return 0;
hdr = stream_read_char(demuxer->stream);
if(stream_eof(demuxer->stream))
return 0;
if((hdr == 'f') || (hdr == 's')) {
stream_seek(demuxer->stream,stream_tell(demuxer->stream)-4);
return DEMUXER_TYPE_NSV;
}
}
return 0;
}
static void demux_close_nsv(demuxer_t* demuxer) {
nsv_priv_t* priv = demuxer->priv;
if(!priv)
return;
free(priv);
}
demuxer_desc_t demuxer_desc_nsv = {
"NullsoftVideo demuxer",
"nsv",
"Nullsoft Streaming Video",
"Reza Jelveh",
"nsv and nsa streaming files",
DEMUXER_TYPE_NSV,
0, // safe but expensive autodetect
nsv_check_file,
demux_nsv_fill_buffer,
demux_open_nsv,
demux_close_nsv,
demux_seek_nsv,
NULL
};
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