From 84e2cacec69c73712100de31585da3fe96c94704 Mon Sep 17 00:00:00 2001
From: Bent Bisballe Nyeng <deva@aasimon.org>
Date: Thu, 24 Dec 2015 17:49:09 +0100
Subject: Split internal CacheManager AFile class out into it's own file/class
 CacheAudioFile and improve interface.

---
 src/cacheaudiofile.cc | 156 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 156 insertions(+)
 create mode 100644 src/cacheaudiofile.cc

(limited to 'src/cacheaudiofile.cc')

diff --git a/src/cacheaudiofile.cc b/src/cacheaudiofile.cc
new file mode 100644
index 0000000..0d4aec9
--- /dev/null
+++ b/src/cacheaudiofile.cc
@@ -0,0 +1,156 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/***************************************************************************
+ *            cacheaudiofile.cc
+ *
+ *  Thu Dec 24 12:17:58 CET 2015
+ *  Copyright 2015 Bent Bisballe Nyeng
+ *  deva@aasimon.org
+ ****************************************************************************/
+
+/*
+ *  This file is part of DrumGizmo.
+ *
+ *  DrumGizmo 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; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  DrumGizmo 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 DrumGizmo; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
+ */
+#include "cacheaudiofile.h"
+
+#include <assert.h>
+
+#include <hugin.hpp>
+
+#include <audiotypes.h>
+
+#include "cachemanager.h"
+
+CacheAudioFile::CacheAudioFile(const std::string& filename)
+	: filename(filename)
+{
+	fh = sf_open(filename.c_str(), SFM_READ, &sf_info);
+	if(!fh)
+	{
+		ERR(audiofile,"SNDFILE Error (%s): %s\n",
+		    filename.c_str(), sf_strerror(fh));
+	}
+}
+
+CacheAudioFile::~CacheAudioFile()
+{
+	if(fh)
+	{
+		sf_close(fh);
+		fh = nullptr;
+	}
+}
+
+size_t CacheAudioFile::getSize() const
+{
+	return sf_info.frames;
+}
+
+const std::string& CacheAudioFile::getFilename() const
+{
+	return filename;
+}
+
+void CacheAudioFile::readChunk(const CacheChannels& channels,
+                               size_t pos, size_t num_samples)
+{
+	if(fh == nullptr)
+	{
+		printf("File handle is null.\n");
+		return;
+	}
+
+	if(pos > sf_info.frames)
+	{
+		printf("pos > sf_info.frames\n");
+		return;
+	}
+
+	sf_seek(fh, pos,
+	        SEEK_SET);
+
+	size_t size = sf_info.frames - pos;
+	if(size > num_samples)
+	{
+		size = num_samples;
+	}
+
+	static sample_t *read_buffer = nullptr;
+	static size_t read_buffer_size = 0;
+
+	if((size * sf_info.channels) > read_buffer_size)
+	{
+		delete[] read_buffer;
+		read_buffer_size = size * sf_info.channels;
+		read_buffer = new sample_t[read_buffer_size];
+		// TODO: This buffer is never free'd on app shutdown.
+	}
+
+	size_t read_size = sf_readf_float(fh, read_buffer, size);
+	(void)read_size;
+
+	for(auto it = channels.begin(); it != channels.end(); ++it)
+	{
+		size_t channel = it->channel;
+		sample_t *data = it->samples;
+		for (size_t i = 0; i < size; ++i)
+		{
+			data[i] = read_buffer[(i * sf_info.channels) + channel];
+		}
+	}
+
+	for(auto it = channels.begin(); it != channels.end(); ++it)
+	{
+		*(it->ready) = true;
+	}
+}
+
+CacheAudioFile& CacheAudioFiles::getAudioFile(const std::string filename)
+{
+	auto it = audiofiles.find(filename);
+	if(it == audiofiles.end())
+	{
+		it = audiofiles.insert(audiofiles.begin(), std::make_pair(filename, new CacheAudioFile(filename)));
+		//it = audiofiles.find(filename);
+	}
+
+	auto afile = it->second;
+
+	// Increase ref count.
+	++afile->ref;
+
+	return *afile;
+}
+
+void CacheAudioFiles::release(const std::string filename)
+{
+	auto it = audiofiles.find(filename);
+	if(it == audiofiles.end())
+	{
+		return; // not open
+	}
+
+	auto audiofile = it->second;
+
+	assert(audiofile->ref); // If ref is not > 0 it shouldn't be in the map.
+
+	--audiofile->ref;
+	if(audiofile->ref == 0)
+	{
+		delete audiofile;
+		audiofiles.erase(it);
+	}
+}
-- 
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