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authorDavid Schleef <ds@schleef.org>2003-07-26 03:01:58 +0000
committerDavid Schleef <ds@schleef.org>2003-07-26 03:01:58 +0000
commit2f0cc8ec30e8c26fed7b2c9ac2614c9a7655fb65 (patch)
tree25c3fbda1c8f8f5a33cad05c78b40887be7d2fba /gst-libs/ext/mplex/inputstrm.cc
parent4df5590ec318054389219b84153cce0ce363613b (diff)
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Moved from gst-plugins/ext/mplex/. See that directory for older changelogs.
Original commit message from CVS: Moved from gst-plugins/ext/mplex/. See that directory for older changelogs.
Diffstat (limited to 'gst-libs/ext/mplex/inputstrm.cc')
-rw-r--r--gst-libs/ext/mplex/inputstrm.cc249
1 files changed, 249 insertions, 0 deletions
diff --git a/gst-libs/ext/mplex/inputstrm.cc b/gst-libs/ext/mplex/inputstrm.cc
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+
+/*
+ * inputstrm.c: Base classes related to muxing out input streams 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 "inputstrm.hh"
+#include "outputstream.hh"
+
+MuxStream::MuxStream ():init (false)
+{
+}
+
+
+void
+MuxStream::Init (const int strm_id,
+ const unsigned int _buf_scale,
+ const unsigned int buf_size,
+ const unsigned int _zero_stuffing, bool bufs_in_first, bool always_bufs)
+{
+ stream_id = strm_id;
+ nsec = 0;
+ zero_stuffing = _zero_stuffing;
+ buffer_scale = _buf_scale;
+ buffer_size = buf_size;
+ bufmodel.Init (buf_size);
+ buffers_in_header = bufs_in_first;
+ always_buffers_in_header = always_bufs;
+ new_au_next_sec = true;
+ init = true;
+}
+
+
+
+unsigned int
+MuxStream::BufferSizeCode ()
+{
+ if (buffer_scale == 1)
+ return buffer_size / 1024;
+ else if (buffer_scale == 0)
+ return buffer_size / 128;
+ else
+ assert (false);
+}
+
+
+
+ElementaryStream::ElementaryStream (IBitStream & ibs, OutputStream & into, stream_kind _kind):
+InputStream (ibs), muxinto (into), kind (_kind), buffer_min (INT_MAX), buffer_max (1)
+{
+}
+
+
+bool ElementaryStream::NextAU ()
+{
+ Aunit *
+ p_au =
+ next ();
+
+ if (p_au != NULL) {
+ au = p_au;
+ au_unsent = p_au->length;
+ return true;
+ } else {
+ au_unsent = 0;
+ return false;
+ }
+}
+
+
+Aunit *
+ElementaryStream::Lookahead ()
+{
+ return aunits.lookahead ();
+}
+
+unsigned int
+ElementaryStream::BytesToMuxAUEnd (unsigned int sector_transport_size)
+{
+ return (au_unsent / min_packet_data) * sector_transport_size +
+ (au_unsent % min_packet_data) + (sector_transport_size - min_packet_data);
+}
+
+
+/******************************************************************
+ * ElementaryStream::ReadPacketPayload
+ *
+ * Reads the stream data from actual input stream, updates decode
+ * buffer model and current access unit information from the
+ * look-ahead scanning buffer to account for bytes_muxed bytes being
+ * muxed out. Particular important is the maintenance of "au_unsent"
+ * the count of how much data in the current AU remains umuxed. It
+ * not only allows us to keep track of AU's but is also used for
+ * generating substream headers
+ *
+ * Unless we need to over-ride it to handle sub-stream headers
+ * The packet payload for an elementary stream is simply the parsed and
+ * spliced buffered stream data..
+ *
+ ******************************************************************/
+
+
+
+unsigned int
+ElementaryStream::ReadPacketPayload (uint8_t * dst, unsigned int to_read)
+{
+ unsigned int actually_read = bs.read_buffered_bytes (dst, to_read);
+
+ Muxed (actually_read);
+ return actually_read;
+}
+
+
+
+
+void
+ElementaryStream::Muxed (unsigned int bytes_muxed)
+{
+ clockticks decode_time;
+
+ if (bytes_muxed == 0 || MuxCompleted ())
+ return;
+
+
+ /* Work through what's left of the current AU and the following AU's
+ updating the info until we reach a point where an AU had to be
+ split between packets.
+ NOTE: It *is* possible for this loop to iterate.
+
+ The DTS/PTS field for the packet in this case would have been
+ given the that for the first AU to start in the packet.
+ Whether Joe-Blow's hardware VCD player handles this properly is
+ another matter of course!
+ */
+
+ decode_time = RequiredDTS ();
+ while (au_unsent < bytes_muxed) {
+
+ bufmodel.Queued (au_unsent, decode_time);
+ bytes_muxed -= au_unsent;
+ if (!NextAU ())
+ return;
+ new_au_next_sec = true;
+ decode_time = RequiredDTS ();
+ };
+
+ // We've now reached a point where the current AU overran or
+ // fitted exactly. We need to distinguish the latter case
+ // so we can record whether the next packet starts with an
+ // existing AU or not - info we need to decide what PTS/DTS
+ // info to write at the start of the next packet.
+
+ if (au_unsent > bytes_muxed) {
+
+ bufmodel.Queued (bytes_muxed, decode_time);
+ au_unsent -= bytes_muxed;
+ new_au_next_sec = false;
+ } else // if (au_unsent == bytes_muxed)
+ {
+ bufmodel.Queued (bytes_muxed, decode_time);
+ if (!NextAU ())
+ return;
+ new_au_next_sec = true;
+ }
+
+}
+
+bool
+ElementaryStream::MuxPossible (clockticks currentSCR)
+{
+ return (!RunOutComplete () && bufmodel.Space () > max_packet_data);
+}
+
+
+void
+ElementaryStream::UpdateBufferMinMax ()
+{
+ buffer_min = buffer_min < (int) bufmodel.Space ()? buffer_min : bufmodel.Space ();
+ buffer_max = buffer_max > (int) bufmodel.Space ()? buffer_max : bufmodel.Space ();
+}
+
+
+
+void
+ElementaryStream::AllDemuxed ()
+{
+ bufmodel.Flushed ();
+}
+
+void
+ElementaryStream::DemuxedTo (clockticks SCR)
+{
+ bufmodel.Cleaned (SCR);
+}
+
+bool
+ElementaryStream::MuxCompleted ()
+{
+ return au_unsent == 0;
+}
+
+void
+ElementaryStream::SetSyncOffset (clockticks sync_offset)
+{
+ timestamp_delay = sync_offset;
+}
+
+Aunit *
+ElementaryStream::next ()
+{
+ Aunit *res;
+
+ while (AUBufferNeedsRefill ()) {
+ FillAUbuffer (FRAME_CHUNK);
+ }
+ res = aunits.next ();
+ return res;
+}
+
+
+
+
+/*
+ * Local variables:
+ * c-file-style: "stroustrup"
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */