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//=========================================================
// MusE
// Linux Music Editor
// $Id: audioprefetch.cpp,v 1.14.2.7 2009/12/20 05:00:35 terminator356 Exp $
//
// (C) Copyright 2001 Werner Schweer (ws@seh.de)
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; version 2 of
// the License, or (at your option) any later version.
//
// 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
//
//=========================================================
#include <poll.h>
#include <stdio.h>
#include <unistd.h>
#include <limits.h>
#include "audioprefetch.h"
#include "globals.h"
#include "track.h"
#include "song.h"
#include "audio.h"
#include "sync.h"
namespace MusEGlobal {
MusECore::AudioPrefetch* audioPrefetch;
}
namespace MusECore {
void initAudioPrefetch()
{
MusEGlobal::audioPrefetch = new AudioPrefetch("Prefetch");
}
//#define AUDIOPREFETCH_DEBUG
enum { PREFETCH_TICK, PREFETCH_SEEK
};
//---------------------------------------------------------
// PrefetchMsg
//---------------------------------------------------------
struct PrefetchMsg : public ThreadMsg {
int pos;
};
//---------------------------------------------------------
// AudioPrefetch
//---------------------------------------------------------
AudioPrefetch::AudioPrefetch(const char* name)
: Thread(name)
{
seekPos = ~0;
writePos = ~0;
seekCount = 0;
}
//---------------------------------------------------------
// readMsg
//---------------------------------------------------------
static void readMsgP(void* p, void*)
{
AudioPrefetch* at = (AudioPrefetch*)p;
at->readMsg1(sizeof(PrefetchMsg));
}
//---------------------------------------------------------
// start
//---------------------------------------------------------
void AudioPrefetch::start(int priority)
{
clearPollFd();
addPollFd(toThreadFdr, POLLIN, MusECore::readMsgP, this, 0);
Thread::start(priority);
}
//---------------------------------------------------------
// ~AudioPrefetch
//---------------------------------------------------------
AudioPrefetch::~AudioPrefetch()
{
}
//---------------------------------------------------------
// processMsg
//---------------------------------------------------------
void AudioPrefetch::processMsg1(const void* m)
{
const PrefetchMsg* msg = (PrefetchMsg*)m;
switch(msg->id) {
case PREFETCH_TICK:
if (MusEGlobal::audio->isRecording())
MusEGlobal::audio->writeTick();
// Indicate do not seek file before each read.
prefetch(false);
seekPos = ~0; // invalidate cached last seek position
break;
case PREFETCH_SEEK:
#ifdef AUDIOPREFETCH_DEBUG
printf("AudioPrefetch::processMsg1 PREFETCH_SEEK msg->pos:%d\n", msg->pos);
#endif
// process seek in background
seek(msg->pos);
break;
default:
printf("AudioPrefetch::processMsg1: unknown message\n");
}
}
//---------------------------------------------------------
// msgTick
//---------------------------------------------------------
void AudioPrefetch::msgTick()
{
PrefetchMsg msg;
msg.id = PREFETCH_TICK;
msg.pos = 0; // seems to be unused, was uninitalized.
while (sendMsg1(&msg, sizeof(msg))) {
printf("AudioPrefetch::msgTick(): send failed!\n");
}
}
//---------------------------------------------------------
// msgSeek
// called from audio RT context
//---------------------------------------------------------
void AudioPrefetch::msgSeek(unsigned samplePos, bool force)
{
if (samplePos == seekPos && !force)
return;
++seekCount;
#ifdef AUDIOPREFETCH_DEBUG
printf("AudioPrefetch::msgSeek samplePos:%u force:%d seekCount:%d\n", samplePos, force, seekCount);
#endif
PrefetchMsg msg;
msg.id = PREFETCH_SEEK;
msg.pos = samplePos;
while (sendMsg1(&msg, sizeof(msg))) {
printf("AudioPrefetch::msgSeek::sleep(1)\n");
sleep(1);
}
}
//---------------------------------------------------------
// prefetch
//---------------------------------------------------------
void AudioPrefetch::prefetch(bool doSeek)
{
if (writePos == ~0U) {
printf("AudioPrefetch::prefetch: invalid write position\n");
return;
}
if (MusEGlobal::song->loop() && !MusEGlobal::audio->bounce() && !MusEGlobal::extSyncFlag.value()) {
const Pos& loop = MusEGlobal::song->rPos();
unsigned n = loop.frame() - writePos;
if (n < MusEGlobal::segmentSize) {
unsigned lpos = MusEGlobal::song->lPos().frame();
// adjust loop start so we get exact loop len
if (n > lpos)
n = 0;
writePos = lpos - n;
}
}
WaveTrackList* tl = MusEGlobal::song->waves();
for (iWaveTrack it = tl->begin(); it != tl->end(); ++it) {
WaveTrack* track = *it;
// Save time. Don't bother if track is off. Track On/Off not designed for rapid repeated response (but mute is). (p3.3.29)
if(track->off())
continue;
int ch = track->channels();
float* bp[ch];
if (track->prefetchFifo()->getWriteBuffer(ch, MusEGlobal::segmentSize, bp, writePos))
continue;
track->fetchData(writePos, MusEGlobal::segmentSize, bp, doSeek);
}
writePos += MusEGlobal::segmentSize;
}
//---------------------------------------------------------
// seek
//---------------------------------------------------------
void AudioPrefetch::seek(unsigned seekTo)
{
#ifdef AUDIOPREFETCH_DEBUG
printf("AudioPrefetch::seek to:%u seekCount:%d\n", seekTo, seekCount);
#endif
// Speedup: More than one seek message pending?
// Eat up seek messages until we get to the very LATEST one,
// because all the rest which came before it are irrelevant now,
// and processing them all was taking extreme time, especially with
// resampling enabled.
// In particular, when the user 'slides' the play cursor back and forth
// there are MANY seek messages in the pipe, and with resampling enabled
// it was taking minutes to finish seeking. If the user hit play during that time,
// things were messed up (FIFO underruns, choppy intermittent sound etc).
// Added by Tim. p3.3.20
if(seekCount > 1)
{
--seekCount;
return;
}
writePos = seekTo;
WaveTrackList* tl = MusEGlobal::song->waves();
for (iWaveTrack it = tl->begin(); it != tl->end(); ++it) {
WaveTrack* track = *it;
track->clearPrefetchFifo();
}
bool isFirstPrefetch = true;
for (unsigned int i = 0; i < (MusEGlobal::fifoLength)-1; ++i)//prevent compiler warning: comparison of signed/unsigned
{
// Indicate do a seek command before read, but only on the first pass.
prefetch(isFirstPrefetch);
isFirstPrefetch = false;
// To help speed things up even more, check the count again. Return if more seek messages are pending. (p3.3.20)
if(seekCount > 1)
{
--seekCount;
return;
}
}
seekPos = seekTo;
--seekCount;
}
} // namespace MusECore
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