mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-11-27 20:21:24 +00:00
99 lines
2.3 KiB
C++
99 lines
2.3 KiB
C++
/* GStreamer mpeg2enc (mjpegtools) wrapper
|
|
* (c) 2003 Ronald Bultje <rbultje@ronald.bitfreak.net>
|
|
*
|
|
* gstmpeg2encstreamwriter.cc: GStreamer/mpeg2enc output wrapper
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Library General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2 of the License, or (at your option) any later version.
|
|
*
|
|
* This library 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
|
|
* Library General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Library General Public
|
|
* License along with this library; 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 "gstmpeg2encstreamwriter.hh"
|
|
|
|
#define BUFSIZE (128*1024)
|
|
|
|
/*
|
|
* Class init stuff.
|
|
*/
|
|
|
|
GstMpeg2EncStreamWriter::GstMpeg2EncStreamWriter (GstPad *in_pad,
|
|
EncoderParams *params) :
|
|
ElemStrmWriter (*params)
|
|
{
|
|
pad = in_pad;
|
|
buf = NULL;
|
|
}
|
|
|
|
/*
|
|
* Output functions.
|
|
*/
|
|
|
|
void
|
|
GstMpeg2EncStreamWriter::PutBits (guint32 val,
|
|
gint n)
|
|
{
|
|
/* only relevant bits. Note that (according to Andrew),
|
|
* some CPUs do bitshifts modulo wordsize (32), which
|
|
* means that we have to check for n != 32 before
|
|
* bitshifting to the relevant bits (i.e. 0xffffffff <<
|
|
* 32 == 0xffffffff). */
|
|
if (n != 32)
|
|
val &= ~(0xffffffffU << n);
|
|
|
|
/* write data */
|
|
while (n >= outcnt) {
|
|
if (!buf) {
|
|
buf = gst_buffer_new_and_alloc (BUFSIZE);
|
|
GST_BUFFER_SIZE (buf) = 0;
|
|
}
|
|
|
|
outbfr = (outbfr << outcnt ) | (val >> (n - outcnt));
|
|
GST_BUFFER_DATA (buf)[GST_BUFFER_SIZE (buf)++] = outbfr;
|
|
n -= outcnt;
|
|
outcnt = 8;
|
|
bytecnt++;
|
|
|
|
if (GST_BUFFER_SIZE (buf) >= GST_BUFFER_MAXSIZE (buf))
|
|
FrameFlush ();
|
|
}
|
|
|
|
/* cache remaining bits */
|
|
if (n != 0) {
|
|
outbfr = (outbfr << n) | val;
|
|
outcnt -= n;
|
|
}
|
|
}
|
|
|
|
void
|
|
GstMpeg2EncStreamWriter::FrameBegin ()
|
|
{
|
|
}
|
|
|
|
void
|
|
GstMpeg2EncStreamWriter::FrameFlush ()
|
|
{
|
|
if (buf) {
|
|
gst_pad_push (pad, GST_DATA (buf));
|
|
buf = NULL;
|
|
}
|
|
}
|
|
|
|
void
|
|
GstMpeg2EncStreamWriter::FrameDiscard ()
|
|
{
|
|
}
|