Aegisub/aegisub/src/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 Project http://www.aegisub.org/
//
// $Id$
/// @file audio_provider_avs.cpp
/// @brief Avisynth-based audio provider
/// @ingroup audio_input
///
#include "config.h"
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#ifdef WITH_AVISYNTH
#ifndef AGI_PRE
#include <Mmreg.h>
#include <time.h>
#include <wx/filename.h>
#endif
#include "audio_provider_avs.h"
#include "charset_conv.h"
#include "compat.h"
#include "main.h"
#include "standard_paths.h"
#include "utils.h"
/// @brief Constructor
/// @param _filename
///
AvisynthAudioProvider::AvisynthAudioProvider(wxString filename) try : filename(filename) {
AVSValue script;
wxMutexLocker lock(AviSynthMutex);
wxFileName fn(filename);
if (!fn.FileExists())
throw agi::FileNotFoundError(STD_STR(filename));
// Include
if (filename.EndsWith(_T(".avs"))) {
char *fname = env->SaveString(fn.GetShortPath().mb_str(csConvLocal));
script = env->Invoke("Import", fname);
}
// Use DirectShowSource
else {
const char * argnames[3] = { 0, "video", "audio" };
AVSValue args[3] = { env->SaveString(fn.GetShortPath().mb_str(csConvLocal)), 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(csConvLocal)));
}
// Load audio with DSS if it exists
if (env->FunctionExists("DirectShowSource")) {
script = env->Invoke("DirectShowSource", AVSValue(args,3),argnames);
}
// Otherwise fail
else {
throw AudioOpenError("No suitable audio source filter found. Try placing DirectShowSource.dll in the Aegisub application directory.");
}
}
LoadFromClip(script);
}
catch (AvisynthError &err) {
throw AudioOpenError("Avisynth error: " + std::string(err.msg));
}
/// @brief Read from environment
/// @param _clip
///
void AvisynthAudioProvider::LoadFromClip(AVSValue _clip) {
AVSValue script;
// Check if it has audio
VideoInfo vi = _clip.AsClip()->GetVideoInfo();
if (!vi.HasAudio()) throw AudioOpenError("No audio found.");
// Convert to one channel
char buffer[1024];
strcpy(buffer,lagi_wxString(OPT_GET("Audio/Downmixer")->GetString()).mb_str(csConvLocal));
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 = OPT_GET("Provider/Audio/AVS/Sample Rate")->GetInt();
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();
clip = tempclip;
}
/// @brief Get audio
/// @param buf
/// @param start
/// @param count
///
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