Aegisub/aegisub/audio_provider_avs.cpp

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// 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
//
// Website: http://aegisub.cellosoft.com
// Contact: mailto:zeratul@cellosoft.com
//
///////////
// Headers
#include <wx/wxprec.h>
2008-01-22 03:54:16 +01:00
#ifdef WITH_AVISYNTH
#include <wx/filename.h>
#include <Mmreg.h>
#include <time.h>
#include "audio_provider_avs.h"
#include "utils.h"
#include "options.h"
#include "standard_paths.h"
//////////////
// Constructor
AvisynthAudioProvider::AvisynthAudioProvider(Aegisub::String _filename) {
filename = _filename.c_str();
try {
OpenAVSAudio();
}
catch (...) {
Unload();
throw;
}
}
//////////////
// Destructor
AvisynthAudioProvider::~AvisynthAudioProvider() {
Unload();
}
////////////////
// Unload audio
void AvisynthAudioProvider::Unload() {
// Clean up avisynth
clip = NULL;
}
////////////////////////////
// Load audio from avisynth
void AvisynthAudioProvider::OpenAVSAudio() {
// Set variables
AVSValue script;
// Prepare avisynth
wxMutexLocker lock(AviSynthMutex);
try {
// Include
if (filename.EndsWith(_T(".avs"))) {
wxFileName fn(filename);
char *fname = env->SaveString(fn.GetShortPath().mb_str(wxConvLocal));
script = env->Invoke("Import", fname);
}
// Use DirectShowSource
else {
wxFileName fn(filename);
const char * argnames[3] = { 0, "video", "audio" };
AVSValue args[3] = { env->SaveString(fn.GetShortPath().mb_str(wxConvLocal)), false, true };
// Load DirectShowSource.dll from app dir if it exists
wxFileName dsspath(StandardPaths::DecodePath(_T("?data/DirectShowSource.dll")));
if (dsspath.FileExists()) {
env->Invoke("LoadPlugin",env->SaveString(dsspath.GetShortPath().mb_str(wxConvLocal)));
}
// Load audio with DSS if it exists
if (env->FunctionExists("DirectShowSource")) {
script = env->Invoke("DirectShowSource", AVSValue(args,3),argnames);
}
// Otherwise fail
else {
throw AvisynthError("No suitable audio source filter found. Try placing DirectShowSource.dll in the Aegisub application directory.");
}
}
LoadFromClip(script);
}
catch (AvisynthError &err) {
throw wxString::Format(_T("AviSynth error: %s"), wxString(err.msg,wxConvLocal));
}
}
/////////////////////////
// Read from environment
void AvisynthAudioProvider::LoadFromClip(AVSValue _clip) {
// Prepare avisynth
AVSValue script;
// Check if it has audio
VideoInfo vi = _clip.AsClip()->GetVideoInfo();
if (!vi.HasAudio()) throw wxString(_T("No audio found."));
// Convert to one channel
char buffer[1024];
strcpy(buffer,Options.AsText(_T("Audio Downmixer")).mb_str(wxConvLocal));
script = env->Invoke(buffer, _clip);
// Convert to 16 bits per sample
script = env->Invoke("ConvertAudioTo16bit", script);
vi = script.AsClip()->GetVideoInfo();
// Convert sample rate
int setsample = Options.AsInt(_T("Audio Sample Rate"));
if (vi.SamplesPerSecond() < 32000) setsample = 44100;
if (setsample != 0) {
AVSValue args[2] = { script, setsample };
script = env->Invoke("ResampleAudio", AVSValue(args,2));
}
// Set clip
PClip tempclip = script.AsClip();
vi = tempclip->GetVideoInfo();
// Read properties
channels = vi.AudioChannels();
num_samples = vi.num_audio_samples;
sample_rate = vi.SamplesPerSecond();
bytes_per_sample = vi.BytesPerAudioSample();
// Set
clip = tempclip;
}
////////////////
// Get filename
wxString AvisynthAudioProvider::GetFilename() {
return filename;
}
/////////////
// Get audio
void AvisynthAudioProvider::GetAudio(void *buf, int64_t start, int64_t count) {
// 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) {
clip->GetAudio(buf,start,count,env);
}
}
#endif