Aegisub/aegisub/libmedia/cache/audio_hd.cpp

181 lines
5.4 KiB
C++

// Copyright (c) 2005-2006, Rodrigo Braz Monteiro, Fredrik Mellbin
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
// * Neither the name of the Aegisub Group nor the names of its contributors
// may be used to endorse or promote products derived from this software
// without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//
// 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
#endif
#include <libaegisub/io.h>
#include "audio_hd.h"
namespace media {
/// @brief Constructor
/// @param source
///
HDAudioProvider::HDAudioProvider(AudioProvider *src, agi::ProgressSinkFactory *progress_factory) {
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
uint64_t freespace;
// XXX: fixme (add diskspace method to agi::util)
// 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);
io::Save file(diskCacheFilename);
std::ofstream& file_cache = file.Get();
// file_cache.Open(diskCacheFilename,wxFile::read_write);
if (!file_cache.is_open()) throw AudioOpenError("Unable to write to audio disk cache.");
// Start progress
ProgressSink *progress = progress_factory->create_progress_sink("Reading to Hard Disk cache");
volatile bool canceled = progress->get_cancelled();
// 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->set_progress(i,num_samples);
}
file_cache.seekp(0);
// Finish
if (canceled) {
// file_cache.Close();
delete[] data;
throw agi::UserCancelException("Audio loading cancelled by user");
}
delete progress;
}
/// @brief Destructor
///
HDAudioProvider::~HDAudioProvider() {
//XXX 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) {
diskmutex.Lock();
file_cache.seekp(start*bytes_per_sample);
file_cache.read((char*)buf,count*bytes_per_sample*channels);
}
}
/// @brief Get disk cache path
/// @return
///
std::string HDAudioProvider::DiskCachePath() {
// Default
/*
std::string 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/")));
*/
return "XXX: fixme";
}
/// @brief Get disk cache filename
///
std::string HDAudioProvider::DiskCacheName() {
/*
XXX: fixme
// Get pattern
std::string 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 "";
}
} // namespace media