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/
/// @file audio_provider_avs.cpp
/// @brief Avisynth-based audio provider
/// @ingroup audio_input
///
#include "config.h"
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#ifdef WITH_AVISYNTH
#include "audio_provider_avs.h"
#include "audio_controller.h"
#include "options.h"
#include "utils.h"
#include <libaegisub/access.h>
#include <libaegisub/charset_conv.h>
#include <libaegisub/fs.h>
#include <libaegisub/path.h>
#include <mutex>
AvisynthAudioProvider::AvisynthAudioProvider(agi::fs::path const& filename) {
this->filename = filename;
agi::acs::CheckFileRead(filename);
std::lock_guard<std::mutex> lock(avs_wrapper.GetMutex());
try {
IScriptEnvironment *env = avs_wrapper.GetEnv();
// Include
if (agi::fs::HasExtension(filename, "avs"))
LoadFromClip(env->Invoke("Import", env->SaveString(agi::fs::ShortName(filename).c_str())));
// Use DirectShowSource
else {
const char * argnames[3] = { 0, "video", "audio" };
AVSValue args[3] = { env->SaveString(agi::fs::ShortName(filename).c_str()), false, true };
// Load DirectShowSource.dll from app dir if it exists
agi::fs::path dsspath(config::path->Decode("?data/DirectShowSource.dll"));
if (agi::fs::FileExists(dsspath))
env->Invoke("LoadPlugin", env->SaveString(agi::fs::ShortName(dsspath).c_str()));
// Load audio with DSS if it exists
if (env->FunctionExists("DirectShowSource"))
LoadFromClip(env->Invoke("DirectShowSource", AVSValue(args, 3), argnames));
// Otherwise fail
else
throw agi::AudioProviderOpenError("No suitable audio source filter found. Try placing DirectShowSource.dll in the Aegisub application directory.", 0);
}
}
catch (AvisynthError &err) {
std::string errmsg(err.msg);
if (errmsg.find("filter graph manager won't talk to me") != errmsg.npos)
throw agi::AudioDataNotFoundError("Avisynth error: " + errmsg, 0);
else
throw agi::AudioProviderOpenError("Avisynth error: " + errmsg, 0);
}
}
void AvisynthAudioProvider::LoadFromClip(AVSValue clip) {
// Check if it has audio
VideoInfo vi = clip.AsClip()->GetVideoInfo();
if (!vi.HasAudio()) throw agi::AudioDataNotFoundError("No audio found.", 0);
IScriptEnvironment *env = avs_wrapper.GetEnv();
// Convert to one channel
AVSValue script = env->Invoke(OPT_GET("Audio/Downmixer")->GetString().c_str(), 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 (setsample == 0 && 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();
float_samples = false;
this->clip = tempclip;
}
void AvisynthAudioProvider::FillBuffer(void *buf, int64_t start, int64_t count) const {
clip->GetAudio(buf, start, count, avs_wrapper.GetEnv());
}
#endif