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99 lines
2.3 KiB
C++
99 lines
2.3 KiB
C++
/* GStreamer mpeg2enc (mjpegtools) wrapper
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* (c) 2003 Ronald Bultje <rbultje@ronald.bitfreak.net>
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*
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* gstmpeg2encstreamwriter.cc: GStreamer/mpeg2enc output wrapper
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "gstmpeg2encstreamwriter.hh"
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#define BUFSIZE (128*1024)
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/*
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* Class init stuff.
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*/
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GstMpeg2EncStreamWriter::GstMpeg2EncStreamWriter (GstPad *in_pad,
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EncoderParams *params) :
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ElemStrmWriter (*params)
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{
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pad = in_pad;
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buf = NULL;
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}
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/*
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* Output functions.
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*/
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void
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GstMpeg2EncStreamWriter::PutBits (guint32 val,
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gint n)
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{
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/* only relevant bits. Note that (according to Andrew),
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* some CPUs do bitshifts modulo wordsize (32), which
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* means that we have to check for n != 32 before
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* bitshifting to the relevant bits (i.e. 0xffffffff <<
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* 32 == 0xffffffff). */
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if (n != 32)
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val &= ~(0xffffffffU << n);
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/* write data */
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while (n >= outcnt) {
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if (!buf) {
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buf = gst_buffer_new_and_alloc (BUFSIZE);
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GST_BUFFER_SIZE (buf) = 0;
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}
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outbfr = (outbfr << outcnt ) | (val >> (n - outcnt));
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GST_BUFFER_DATA (buf)[GST_BUFFER_SIZE (buf)++] = outbfr;
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n -= outcnt;
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outcnt = 8;
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bytecnt++;
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if (GST_BUFFER_SIZE (buf) >= GST_BUFFER_MAXSIZE (buf))
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FrameFlush ();
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}
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/* cache remaining bits */
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if (n != 0) {
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outbfr = (outbfr << n) | val;
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outcnt -= n;
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}
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}
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void
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GstMpeg2EncStreamWriter::FrameBegin ()
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{
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}
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void
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GstMpeg2EncStreamWriter::FrameFlush ()
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{
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if (buf) {
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gst_pad_push (pad, GST_DATA (buf));
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buf = NULL;
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}
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}
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void
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GstMpeg2EncStreamWriter::FrameDiscard ()
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{
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}
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