First stab at porting mplex

Original commit message from CVS:
First stab at porting mplex

1 files changed, 144 insertions, 0 deletions

diff --git a/ext/mplex/audiostrm_out.cc b/ext/mplex/audiostrm_out.cc
new file mode 100644
index 00000000..5ef358af
--- /dev/null
+++ b/ext/mplex/audiostrm_out.cc
@@ -0,0 +1,144 @@
+
+/*
+ *  inptstrm.c:  Members of audi stream classes related to muxing out into
+ *               the output stream.
+ *
+ *  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 <config.h>
+#include <assert.h>
+#include "fastintfns.h"
+#include "audiostrm.hh"
+#include "outputstream.hh"
+
+
+
+AudioStream::AudioStream (IBitStream & ibs, OutputStream & into):
+ElementaryStream (ibs, into, ElementaryStream::audio), num_syncword (0)
+{
+  FRAME_CHUNK = 24;
+  for (int i = 0; i < 2; ++i)
+    num_frames[i] = size_frames[i] = 0;
+}
+
+void
+AudioStream::InitAUbuffer ()
+{
+  unsigned int i;
+
+  for (i = 0; i < aunits.BUF_SIZE; ++i)
+    aunits.init (new AAunit);
+}
+
+
+
+/*********************************
+ * Signals when audio stream has completed mux run-out specified
+ * in associated mux stream. 
+ *********************************/
+
+bool
+AudioStream::RunOutComplete ()
+{
+  return (au_unsent == 0 || (muxinto.running_out && RequiredPTS () >= muxinto.runout_PTS));
+}
+
+bool
+AudioStream::AUBufferNeedsRefill ()
+{
+  return
+    !eoscan
+    && (aunits.current () + FRAME_CHUNK > last_buffered_AU
+	|| bs.buffered_bytes () < muxinto.sector_size);
+}
+
+/******************************************************************
+	Output_Audio
+	generates Pack/Sys Header/Packet information from the
+	audio stream and saves them into the sector
+******************************************************************/
+
+void
+AudioStream::OutputSector ()
+{
+  clockticks PTS;
+  unsigned int max_packet_data;
+  unsigned int actual_payload;
+  unsigned int old_au_then_new_payload;
+
+  PTS = RequiredDTS ();
+  old_au_then_new_payload = muxinto.PacketPayload (*this, buffers_in_header, false, false);
+
+  max_packet_data = 0;
+  if (muxinto.running_out && NextRequiredPTS () > muxinto.runout_PTS) {
+    /* We're now in the last AU of a segment.  So we don't want to
+       go beyond it's end when writing sectors. Hence we limit
+       packet payload size to (remaining) AU length.
+     */
+    max_packet_data = au_unsent;
+  }
+
+  /* CASE: packet starts with new access unit                     */
+
+  if (new_au_next_sec) {
+    actual_payload =
+      muxinto.WritePacket (max_packet_data, *this, buffers_in_header, PTS, 0, TIMESTAMPBITS_PTS);
+
+  }
+
+
+  /* CASE: packet starts with old access unit, no new one */
+  /*       starts in this very same packet                        */
+  else if (!(new_au_next_sec) && (au_unsent >= old_au_then_new_payload)) {
+    actual_payload =
+      muxinto.WritePacket (max_packet_data, *this, buffers_in_header, 0, 0, TIMESTAMPBITS_NO);
+  }
+
+
+  /* CASE: packet starts with old access unit, a new one  */
+  /*       starts in this very same packet                        */
+  else {			/* !(new_au_next_sec) &&  (au_unsent < old_au_then_new_payload)) */
+
+    /* is there another access unit anyway ? */
+    if (Lookahead () != 0) {
+      PTS = NextRequiredDTS ();
+      actual_payload =
+	muxinto.WritePacket (max_packet_data, *this, buffers_in_header, PTS, 0, TIMESTAMPBITS_PTS);
+
+    } else {
+      actual_payload = muxinto.WritePacket (0, *this, buffers_in_header, 0, 0, TIMESTAMPBITS_NO);
+    };
+
+  }
+
+  ++nsec;
+
+  buffers_in_header = always_buffers_in_header;
+
+}
+
+
+
+/* 
+ * Local variables:
+ *  c-file-style: "stroustrup"
+ *  tab-width: 4
+ *  indent-tabs-mode: nil
+ * End:
+ */