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authorWim Taymans <wim.taymans@gmail.com>2002-10-24 22:37:51 +0000
committerWim Taymans <wim.taymans@gmail.com>2002-10-24 22:37:51 +0000
commit1496394c0f4be1a718fb189846c6350cbd9e43da (patch)
tree7f839063fd206ad3db102a7a20c336d0c8423295 /ext/mplex/audiostrm_out.cc
parent440801dd9e53284925575c2170b53bf947522414 (diff)
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First stab at porting mplex
Original commit message from CVS: First stab at porting mplex
Diffstat (limited to 'ext/mplex/audiostrm_out.cc')
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diff --git a/ext/mplex/audiostrm_out.cc b/ext/mplex/audiostrm_out.cc
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+
+/*
+ * 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:
+ */