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mpv/libmpdemux/demux_nsv.c

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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 256000
/**
* Seeking still to be implemented
*/
static void demux_seek_nsv ( demuxer_t *demuxer, float rel_seek_secs, float audio_delay, 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=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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