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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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144 lines
3.9 KiB
C++
144 lines
3.9 KiB
C++
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/*
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* inptstrm.c: Members of audi stream classes related to muxing out into
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* the output stream.
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*
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* Copyright (C) 2001 Andrew Stevens <andrew.stevens@philips.com>
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*
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public License
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* as published by the Free Software Foundation.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <config.h>
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#include <assert.h>
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#include "fastintfns.h"
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#include "audiostrm.hh"
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#include "outputstream.hh"
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AudioStream::AudioStream (IBitStream & ibs, OutputStream & into):
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ElementaryStream (ibs, into, ElementaryStream::audio), num_syncword (0)
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{
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FRAME_CHUNK = 24;
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for (int i = 0; i < 2; ++i)
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num_frames[i] = size_frames[i] = 0;
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}
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void
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AudioStream::InitAUbuffer ()
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{
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unsigned int i;
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for (i = 0; i < aunits.BUF_SIZE; ++i)
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aunits.init (new AAunit);
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}
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/*********************************
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* Signals when audio stream has completed mux run-out specified
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* in associated mux stream.
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*********************************/
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bool
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AudioStream::RunOutComplete ()
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{
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return (au_unsent == 0 || (muxinto.running_out && RequiredPTS () >= muxinto.runout_PTS));
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}
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bool
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AudioStream::AUBufferNeedsRefill ()
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{
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return
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!eoscan
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&& (aunits.current () + FRAME_CHUNK > last_buffered_AU
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|| bs.buffered_bytes () < muxinto.sector_size);
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}
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/******************************************************************
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Output_Audio
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generates Pack/Sys Header/Packet information from the
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audio stream and saves them into the sector
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******************************************************************/
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void
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AudioStream::OutputSector ()
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{
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clockticks PTS;
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unsigned int max_packet_data;
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unsigned int actual_payload;
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unsigned int old_au_then_new_payload;
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PTS = RequiredDTS ();
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old_au_then_new_payload = muxinto.PacketPayload (*this, buffers_in_header, false, false);
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max_packet_data = 0;
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if (muxinto.running_out && NextRequiredPTS () > muxinto.runout_PTS) {
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/* We're now in the last AU of a segment. So we don't want to
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go beyond it's end when writing sectors. Hence we limit
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packet payload size to (remaining) AU length.
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*/
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max_packet_data = au_unsent;
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}
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/* CASE: packet starts with new access unit */
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if (new_au_next_sec) {
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actual_payload =
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muxinto.WritePacket (max_packet_data, *this, buffers_in_header, PTS, 0, TIMESTAMPBITS_PTS);
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}
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/* CASE: packet starts with old access unit, no new one */
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/* starts in this very same packet */
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else if (!(new_au_next_sec) && (au_unsent >= old_au_then_new_payload)) {
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actual_payload =
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muxinto.WritePacket (max_packet_data, *this, buffers_in_header, 0, 0, TIMESTAMPBITS_NO);
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}
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/* CASE: packet starts with old access unit, a new one */
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/* starts in this very same packet */
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else { /* !(new_au_next_sec) && (au_unsent < old_au_then_new_payload)) */
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/* is there another access unit anyway ? */
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if (Lookahead () != 0) {
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PTS = NextRequiredDTS ();
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actual_payload =
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muxinto.WritePacket (max_packet_data, *this, buffers_in_header, PTS, 0, TIMESTAMPBITS_PTS);
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} else {
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actual_payload = muxinto.WritePacket (0, *this, buffers_in_header, 0, 0, TIMESTAMPBITS_NO);
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};
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}
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++nsec;
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buffers_in_header = always_buffers_in_header;
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}
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/*
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* Local variables:
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* c-file-style: "stroustrup"
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* tab-width: 4
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* indent-tabs-mode: nil
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* End:
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*/
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