Aegisub/aegisub/libmedia/cache/audio_hd.cpp

// Copyright (c) 2005-2006, Rodrigo Braz Monteiro, Fredrik Mellbin
// All rights reserved.
//
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// modification, are permitted provided that the following conditions are met:
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//     this list of conditions and the following disclaimer.
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// Aegisub Project http://www.aegisub.org/
//
// $Id$

/// @file audio_provider_hd.cpp
/// @brief Caching audio provider using a file for backing
/// @ingroup audio_input
///

#include "config.h"

#ifndef AGI_PRE
#include <wx/filefn.h>
#include <wx/filename.h>
#endif

#include "audio_provider_hd.h"
#include "compat.h"
#include "dialog_progress.h"
#include "frame_main.h"
#include "main.h"
#include "standard_paths.h"
#include "utils.h"

/// @brief Constructor 
/// @param source 
///
HDAudioProvider::HDAudioProvider(AudioProvider *src) {
	std::auto_ptr<AudioProvider> source(src);
	// Copy parameters
	bytes_per_sample = source->GetBytesPerSample();
	num_samples = source->GetNumSamples();
	channels = source->GetChannels();
	sample_rate = source->GetSampleRate();
	filename = source->GetFilename();
	samples_native_endian = source->AreSamplesNativeEndian();

	// Check free space
	wxLongLong freespace;
	if (wxGetDiskSpace(DiskCachePath(), NULL, &freespace)) {
		if (num_samples * channels * bytes_per_sample > freespace) {
			throw AudioOpenError("Not enough free disk space in " + STD_STR(DiskCachePath()) + " to cache the audio");
		}
	}

	// Open output file
	diskCacheFilename = DiskCacheName();
	file_cache.Create(diskCacheFilename,true,wxS_DEFAULT);
	file_cache.Open(diskCacheFilename,wxFile::read_write);
	if (!file_cache.IsOpened()) throw AudioOpenError("Unable to write to audio disk cache.");

	// Start progress
	volatile bool canceled = false;
	DialogProgress *progress = new DialogProgress(AegisubApp::Get()->frame,_T("Load audio"),&canceled,_T("Reading to Hard Disk cache"),0,num_samples);
	progress->Show();

	// Write to disk
	int block = 4096;
	data = new char[block * channels * bytes_per_sample];
	for (int64_t i=0;i<num_samples && !canceled; i+=block) {
		if (block+i > num_samples) block = num_samples - i;
		source->GetAudio(data,i,block);
		file_cache.Write(data,block * channels * bytes_per_sample);
		progress->SetProgress(i,num_samples);
	}
	file_cache.Seek(0);

	// Finish
	if (canceled) {
		file_cache.Close();
		delete[] data;
		throw agi::UserCancelException("Audio loading cancelled by user");
	}
	progress->Destroy();
}

/// @brief Destructor 
///
HDAudioProvider::~HDAudioProvider() {
	file_cache.Close();
	wxRemoveFile(diskCacheFilename);
	delete[] data;
}

/// @brief Get audio 
/// @param buf   
/// @param start 
/// @param count 
///
void HDAudioProvider::GetAudio(void *buf, int64_t start, int64_t count) const {
	// Requested beyond the length of audio
	if (start+count > num_samples) {
		int64_t oldcount = count;
		count = num_samples-start;
		if (count < 0) count = 0;

		// Fill beyond with zero
		if (bytes_per_sample == 1) {
			char *temp = (char *) buf;
			for (int i=count;i<oldcount;i++) {
				temp[i] = 0;
			}
		}
		if (bytes_per_sample == 2) {
			short *temp = (short *) buf;
			for (int i=count;i<oldcount;i++) {
				temp[i] = 0;
			}
		}
	}

	if (count) {
		wxMutexLocker disklock(diskmutex);
		file_cache.Seek(start*bytes_per_sample);
		file_cache.Read((char*)buf,count*bytes_per_sample*channels);
	}
}

/// @brief Get disk cache path 
/// @return 
///
wxString HDAudioProvider::DiskCachePath() {
	// Default
	wxString path = lagi_wxString(OPT_GET("Audio/Cache/HD/Location")->GetString());
	if (path == _T("default")) return StandardPaths::DecodePath(_T("?temp/"));

	// Specified
	return DecodeRelativePath(path,StandardPaths::DecodePath(_T("?user/")));
}

/// @brief Get disk cache filename 
///
wxString HDAudioProvider::DiskCacheName() {
	// Get pattern
	wxString pattern = lagi_wxString(OPT_GET("Audio/Cache/HD/Name")->GetString());
	if (pattern.Find(_T("%02i")) == wxNOT_FOUND) pattern = _T("audio%02i.tmp");
	
	// Try from 00 to 99
	for (int i=0;i<100;i++) {
		// File exists?
		wxString curStringTry = DiskCachePath() + wxString::Format(pattern.c_str(),i);
		if (!wxFile::Exists(curStringTry)) return curStringTry;
	}
	return L"";
}