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/*
* stillsstreams.c: Class for elemenary still video streams
* Most functionality is inherited from VideoStream
*
* Copyright (C) 2001 Andrew Stevens <andrew.stevens@philips.com>
*
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of version 2 of the GNU General Public License
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <format_codes.h>
#include "stillsstream.hpp"
#include "interact.hpp"
#include "multiplexor.hpp"
void StillsStream::Init ( )
{
int stream_id = -1;
int buffer_size = -1;
SetBufSize( 4*1024*1024 );
ScanFirstSeqHeader();
mjpeg_debug( "Stills: Video buffer suggestion ignored!" );
switch( muxinto.mux_format )
{
case MPEG_FORMAT_VCD_STILL :
if( horizontal_size > 352 )
{
stream_id = VIDEO_STR_0+2 ;
buffer_size = vbv_buffer_size*2048;
mjpeg_info( "Stills Stream %02x: high-resolution VCD stills %d KB each",
stream_id,
buffer_size );
if( buffer_size < 46*1024 )
mjpeg_error_exit1( "I Can't multiplex high-res stills smaller than normal res stills - sorry!");
}
else
{
stream_id = VIDEO_STR_0+1 ;
buffer_size = 46*1024;
mjpeg_info( "Stills Stream %02x: normal VCD stills", stream_id );
}
break;
case MPEG_FORMAT_SVCD_STILL :
if( horizontal_size > 480 )
{
stream_id = VIDEO_STR_0+1;
buffer_size = 230*1024;
mjpeg_info( "Stills Stream %02x: high-resolution SVCD stills.",
stream_id );
}
else
{
stream_id = VIDEO_STR_0+1 ;
buffer_size = 230*1024;
mjpeg_info( "Stills Stream %02x: normal-resolution SVCD stills.", stream_id );
}
break;
default:
mjpeg_error_exit1( "Only SVCD and VCD Still currently supported");
}
MuxStream::Init( stream_id,
1, // Buffer scale
buffer_size,
0, // Zero stuffing
muxinto.buffers_in_video,
muxinto.always_buffers_in_video);
/* Skip to the end of the 1st AU (*2nd* Picture start!)
*/
AU_hdr = SEQUENCE_HEADER;
AU_pict_data = 0;
AU_start = 0;
OutputSeqhdrInfo();
}
/*
* Compute DTS / PTS for a VCD/SVCD Stills sequence
* TODO: Very crude. Simply assumes each still stays for the specified
* frame interval and that enough run-in delay is present for the first
* frame to be loaded.
*
*/
void StillsStream::NextDTSPTS( )
{
StillsParams *sparms = static_cast<StillsParams*>(parms);
clockticks interval = static_cast<clockticks>
(sparms->Intervals()->NextFrameInterval() * CLOCKS / frame_rate);
clockticks time_for_xfer;
muxinto.ByteposTimecode( BufferSize(), time_for_xfer );
access_unit.DTS = current_PTS + time_for_xfer; // This frame decoded just after
// Predecessor completed.
access_unit.PTS = current_PTS + time_for_xfer + interval;
current_PTS = access_unit.PTS;
current_DTS = access_unit.DTS;
fields_presented += 2;
}
/*
* VCD mixed stills segment items have the constraint that both stills
* streams must end together. To do this each stream has to know
* about its "sibling".
*
*/
void VCDStillsStream::SetSibling( VCDStillsStream *_sibling )
{
assert( _sibling != 0 );
sibling = _sibling;
if( sibling->stream_id == stream_id )
{
mjpeg_error_exit1("VCD mixed stills stream cannot contain two streams of the same type!");
}
}
/*
* Check if we've reached the last sector of the last AU. Note: that
* we know no PTS/DTS time-stamps will be needed because no new AU
* will appear in the last sector. WARNING: We assume a still won't
* fit into a single secotr.
*
*/
bool VCDStillsStream::LastSectorLastAU()
{
return ( Lookahead() == 0 &&
au_unsent <= muxinto.PacketPayload( *this,
buffers_in_header,
false, false )
);
}
/*
* The requirement that VCD mixed stills segment items constituent streams
* end together means we can't mux the last sector of the last AU of
* such streams until its sibling has already completed muxing or is
* also ready to mux the last sector of its last AU.
*
* NOTE: Will not work right if sector_align_iframe_AUs not set as this
* will allow multiple AU's in a sector.
*
*/
bool VCDStillsStream::MuxPossible(clockticks currentSCR)
{
if( bufmodel.Size() < au_unsent )
{
mjpeg_error_exit1( "Illegal VCD still: larger than maximum permitted by its buffering parameters!");
}
if (RunOutComplete() || bufmodel.Space() < au_unsent)
{
return false;
}
if( LastSectorLastAU() )
{
if( sibling != 0 )
{
if( !stream_mismatch_warned && sibling->NextAUType() != NOFRAME )
{
mjpeg_warn( "One VCD stills stream runs significantly longer than the other!");
mjpeg_warn( "Simultaneous stream ending recommended by standard not possible" );
return true;
}
return sibling->MuxCompleted() || sibling->LastSectorLastAU();
}
else
return true;
}
else
return true;
}
/*
* Local variables:
* c-file-style: "stroustrup"
* tab-width: 4
* indent-tabs-mode: nil
* End:
*/
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