gstreamer/ext/mplex/stillsstream.cc

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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.
*/
#include <format_codes.h>
#include "stillsstream.hh"
#include "outputstream.hh"
void
StillsStream::Init ()
{
int stream_id = 0;
int buffer_size = 0;
SetBufSize (4 * 1024 * 1024);
InitAUbuffer ();
ScanFirstSeqHeader ();
mjpeg_debug ("SETTING video buffer to %d", muxinto.video_buffer_size);
switch (opt_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;
}
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 = 0LL;
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 (clockticks & DTS, clockticks & PTS)
{
clockticks interval = static_cast < clockticks >
(intervals->NextFrameInterval () * CLOCKS / frame_rate);
clockticks time_for_xfer;
muxinto.ByteposTimecode (BufferSize (), time_for_xfer);
DTS = current_PTS + time_for_xfer; // This frame decoded just after
// Predecessor completed.
PTS = current_PTS + time_for_xfer + interval;
current_PTS = PTS;
current_DTS = DTS;
}
/*
* 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 ()
{
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:
*/