Aegisub/aegisub/audio_provider.cpp

245 lines
6.1 KiB
C++

// Copyright (c) 2005-2006, Rodrigo Braz Monteiro
// 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
//
// Website: http://aegisub.cellosoft.com
// Contact: mailto:zeratul@cellosoft.com
//
///////////
// Headers
#include <wx/wxprec.h>
#include <wx/thread.h>
#include "audio_provider_ram.h"
#include "audio_provider_hd.h"
#include "audio_provider_pcm.h"
#include "options.h"
#include "audio_display.h"
///////////////
// Constructor
AudioProvider::AudioProvider() {
raw = NULL;
}
//////////////
// Destructor
AudioProvider::~AudioProvider() {
// Clear buffers
delete[] raw;
}
//////////////////////////
// Get number of channels
int AudioProvider::GetChannels() {
return channels;
}
//////////////////////////
// Get number of samples
int64_t AudioProvider::GetNumSamples() {
return num_samples;
}
///////////////////
// Get sample rate
int AudioProvider::GetSampleRate() {
return sample_rate;
}
////////////////////////
// Get bytes per sample
int AudioProvider::GetBytesPerSample() {
return bytes_per_sample;
}
////////////////
// Get filename
wxString AudioProvider::GetFilename() {
return filename;
}
////////////////
// Get waveform
void AudioProvider::GetWaveForm(int *min,int *peak,int64_t start,int w,int h,int samples,float scale) {
// Setup
int channels = GetChannels();
int n = w * samples;
for (int i=0;i<w;i++) {
peak[i] = 0;
min[i] = h;
}
// Prepare waveform
int cur;
int curvalue;
// Prepare buffers
int needLen = n*channels*bytes_per_sample;
if (raw) {
if (raw_len < needLen) {
delete[] raw;
raw = NULL;
}
}
if (!raw) {
raw_len = needLen;
raw = new char[raw_len];
}
if (bytes_per_sample == 1) {
// Read raw samples
unsigned char *raw_char = (unsigned char*) raw;
GetAudio(raw,start,n);
int amplitude = int(h*scale);
// Calculate waveform
for (int i=0;i<n;i++) {
cur = i/samples;
curvalue = h - (int(raw_char[i*channels])*amplitude)/0xFF;
if (curvalue > h) curvalue = h;
if (curvalue < 0) curvalue = 0;
if (curvalue < min[cur]) min[cur] = curvalue;
if (curvalue > peak[cur]) peak[cur] = curvalue;
}
}
if (bytes_per_sample == 2) {
// Read raw samples
short *raw_short = (short*) raw;
GetAudio(raw,start,n);
int half_h = h/2;
int half_amplitude = int(half_h * scale);
// Calculate waveform
for (int i=0;i<n;i++) {
cur = i/samples;
curvalue = half_h - (int(raw_short[i*channels])*half_amplitude)/0x8000;
if (curvalue > h) curvalue = h;
if (curvalue < 0) curvalue = 0;
if (curvalue < min[cur]) min[cur] = curvalue;
if (curvalue > peak[cur]) peak[cur] = curvalue;
}
}
}
/////////////////////////
// Get audio with volume
void AudioProvider::GetAudioWithVolume(void *buf, int64_t start, int64_t count, double volume) {
GetAudio(buf,start,count);
if (volume == 1.0) return;
if (bytes_per_sample == 2) {
// Read raw samples
short *buffer = (short*) buf;
int value;
// Modify
for (int64_t i=0;i<count;i++) {
value = (int)(buffer[i]*volume+0.5);
if (value < -0x8000) value = -0x8000;
if (value > 0x7FFF) value = 0x7FFF;
buffer[i] = value;
}
}
}
////////////////
// Get provider
AudioProvider *AudioProviderFactory::GetAudioProvider(wxString filename, int cache) {
// Prepare provider
AudioProvider *provider = NULL;
// Try a PCM provider first
provider = CreatePCMAudioProvider(filename);
if (provider) return provider;
// List of providers
wxArrayString list = GetFactoryList(Options.AsText(_T("Audio provider")));
// None available
if (list.Count() == 0) throw _T("No audio providers are available.");
// Get provider
wxString error;
for (unsigned int i=0;i<list.Count();i++) {
try {
AudioProvider *prov = GetFactory(list[i])->CreateProvider(filename);
if (prov) {
provider = prov;
break;
}
}
catch (wxString err) { error += list[i] + _T(" factory: ") + err + _T("\n"); }
catch (const wxChar *err) { error += list[i] + _T(" factory: ") + wxString(err) + _T("\n"); }
catch (...) { error += list[i] + _T(" factory: Unknown error\n"); }
}
// Failed
if (!provider) throw error;
// Change provider to RAM/HD cache if needed
if (cache == -1) cache = Options.AsInt(_T("Audio Cache"));
if (cache) {
AudioProvider *final = NULL;
// Convert to RAM
if (cache == 1) final = new RAMAudioProvider(provider);
// Convert to HD
if (cache == 2) final = new HDAudioProvider(provider);
// Reassign
if (final) {
delete provider;
provider = final;
}
}
// Return
return provider;
}
//////////
// Static
template <class AudioProviderFactory> std::map<wxString,AudioProviderFactory*>* AegisubFactory<AudioProviderFactory>::factories=NULL;