Aegisub/core/audio_provider.cpp

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// Copyright (c) 2005-2006, Rodrigo Braz Monteiro
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// 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 "audio_provider_avs.h"
#include "audio_provider_lavc.h"
#include "audio_provider_ram.h"
#include "audio_provider_hd.h"
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#include "options.h"
#include "audio_display.h"
///////////////
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// Constructor
AudioProvider::AudioProvider() {
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raw = NULL;
}
//////////////
// Destructor
AudioProvider::~AudioProvider() {
// Clear buffers
delete raw;
}
//////////////////////////
// Get number of channels
int AudioProvider::GetChannels() {
return channels;
}
//////////////////////////
// Get number of samples
__int64 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;
}
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////////////////
// Get waveform
void AudioProvider::GetWaveForm(int *min,int *peak,__int64 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 = (void*) 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 = 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 = 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 provider
AudioProvider *AudioProvider::GetAudioProvider(wxString filename, AudioDisplay *display) {
// Prepare provider
AudioProvider *provider = NULL;
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// Select provider
#ifdef __WINDOWS__
provider = new AvisynthAudioProvider(filename);
#endif
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#ifdef USE_LAVC
if (!provider) provider = new LAVCAudioProvider(filename);
#endif
// No provider found
if (!provider) {
throw _T("Could not initialize any audio provider.");
}
// Change provider to RAM/HD cache if needed
int cacheMode = Options.AsInt(_T("Audio Cache"));
if (cacheMode) {
AudioProvider *final = NULL;
// Convert to RAM
if (cacheMode == 1) final = new RAMAudioProvider(provider);
// Convert to HD
if (cacheMode == 2) final = new HDAudioProvider(provider);
// Reassign
if (final) {
delete provider;
provider = final;
}
}
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// Return
return provider;
}