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// Copyright (c) 2008-2009, Karl Blomster
// 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_ffmpegsource.cpp
/// @brief ffms2-based audio provider
/// @ingroup audio_input ffms
///
#ifdef WITH_FFMS2
#include <libaegisub/audio/provider.h>
#include "ffmpegsource_common.h"
#include "options.h"
#include <libaegisub/fs.h>
#include <libaegisub/make_unique.h>
#include <map>
namespace {
class FFmpegSourceAudioProvider final : public agi::AudioProvider, FFmpegSourceProvider {
/// audio source object
agi::scoped_holder<FFMS_AudioSource*, void (FFMS_CC *)(FFMS_AudioSource*)> AudioSource;
mutable char FFMSErrMsg[1024]; ///< FFMS error message
mutable FFMS_ErrorInfo ErrInfo; ///< FFMS error codes/messages
void LoadAudio(agi::fs::path const& filename);
void FillBuffer(void *Buf, int64_t Start, int64_t Count) const override {
if (FFMS_GetAudio(AudioSource, Buf, Start, Count, &ErrInfo))
throw agi::AudioDecodeError(std::string("Failed to get audio samples: ") + ErrInfo.Buffer);
}
public:
FFmpegSourceAudioProvider(agi::fs::path const& filename, agi::BackgroundRunner *br);
bool NeedsCache() const override { return true; }
};
/// @brief Constructor
/// @param filename The filename to open
FFmpegSourceAudioProvider::FFmpegSourceAudioProvider(agi::fs::path const& filename, agi::BackgroundRunner *br) try
: FFmpegSourceProvider(br)
, AudioSource(nullptr, FFMS_DestroyAudioSource)
{
ErrInfo.Buffer = FFMSErrMsg;
ErrInfo.BufferSize = sizeof(FFMSErrMsg);
ErrInfo.ErrorType = FFMS_ERROR_SUCCESS;
ErrInfo.SubType = FFMS_ERROR_SUCCESS;
SetLogLevel();
LoadAudio(filename);
}
catch (agi::EnvironmentError const& err) {
throw agi::AudioProviderError(err.GetMessage());
}
void FFmpegSourceAudioProvider::LoadAudio(agi::fs::path const& filename) {
FFMS_Indexer *Indexer = FFMS_CreateIndexer(filename.string().c_str(), &ErrInfo);
if (!Indexer) {
if (ErrInfo.SubType == FFMS_ERROR_FILE_READ)
throw agi::fs::FileNotFound(std::string(ErrInfo.Buffer));
else
throw agi::AudioDataNotFound(ErrInfo.Buffer);
}
std::map<int, std::string> TrackList = GetTracksOfType(Indexer, FFMS_TYPE_AUDIO);
// initialize the track number to an invalid value so we can detect later on
// whether the user actually had to choose a track or not
int TrackNumber = -1;
if (TrackList.size() > 1) {
auto Selection = AskForTrackSelection(TrackList, FFMS_TYPE_AUDIO);
if (Selection == TrackSelection::None)
throw agi::UserCancelException("audio loading canceled by user");
TrackNumber = static_cast<int>(Selection);
}
else if (TrackList.size() == 1)
TrackNumber = TrackList.begin()->first;
else
throw agi::AudioDataNotFound("no audio tracks found");
// generate a name for the cache file
agi::fs::path CacheName = GetCacheFilename(filename);
// try to read index
agi::scoped_holder<FFMS_Index*, void (FFMS_CC*)(FFMS_Index*)>
Index(FFMS_ReadIndex(CacheName.string().c_str(), &ErrInfo), FFMS_DestroyIndex);
if (Index && FFMS_IndexBelongsToFile(Index, filename.string().c_str(), &ErrInfo))
Index = nullptr;
if (Index) {
// we already have an index, but the desired track may not have been
// indexed, and if it wasn't we need to reindex
FFMS_Track *TempTrackData = FFMS_GetTrackFromIndex(Index, TrackNumber);
if (FFMS_GetNumFrames(TempTrackData) <= 0)
Index = nullptr;
}
// reindex if the error handling mode has changed
FFMS_IndexErrorHandling ErrorHandling = GetErrorHandlingMode();
#if FFMS_VERSION >= ((2 << 24) | (17 << 16) | (2 << 8) | 0)
if (Index && FFMS_GetErrorHandling(Index) != ErrorHandling)
Index = nullptr;
#endif
// moment of truth
if (!Index) {
TrackSelection TrackMask = static_cast<TrackSelection>(TrackNumber);
if (OPT_GET("Provider/FFmpegSource/Index All Tracks")->GetBool())
TrackMask = TrackSelection::All;
Index = DoIndexing(Indexer, CacheName, TrackMask, ErrorHandling);
}
else
FFMS_CancelIndexing(Indexer);
// update access time of index file so it won't get cleaned away
agi::fs::Touch(CacheName);
AudioSource = FFMS_CreateAudioSource(filename.string().c_str(), TrackNumber, Index, -1, &ErrInfo);
if (!AudioSource)
throw agi::AudioProviderError(std::string("Failed to open audio track: ") + ErrInfo.Buffer);
const FFMS_AudioProperties AudioInfo = *FFMS_GetAudioProperties(AudioSource);
channels = AudioInfo.Channels;
sample_rate = AudioInfo.SampleRate;
num_samples = AudioInfo.NumSamples;
decoded_samples = AudioInfo.NumSamples;
if (channels <= 0 || sample_rate <= 0 || num_samples <= 0)
throw agi::AudioProviderError("sanity check failed, consult your local psychiatrist");
switch (AudioInfo.SampleFormat) {
case FFMS_FMT_U8: bytes_per_sample = 1; float_samples = false; break;
case FFMS_FMT_S16: bytes_per_sample = 2; float_samples = false; break;
case FFMS_FMT_S32: bytes_per_sample = 4; float_samples = false; break;
case FFMS_FMT_FLT: bytes_per_sample = 4; float_samples = true; break;
case FFMS_FMT_DBL: bytes_per_sample = 8; float_samples = true; break;
default:
throw agi::AudioProviderError("unknown or unsupported sample format");
}
#if FFMS_VERSION >= ((2 << 24) | (17 << 16) | (4 << 8) | 0)
if (channels > 1 || bytes_per_sample != 2) {
std::unique_ptr<FFMS_ResampleOptions, decltype(&FFMS_DestroyResampleOptions)>
opt(FFMS_CreateResampleOptions(AudioSource), FFMS_DestroyResampleOptions);
opt->ChannelLayout = FFMS_CH_FRONT_CENTER;
opt->SampleFormat = FFMS_FMT_S16;
// Might fail if FFMS2 wasn't built with libavresample
if (!FFMS_SetOutputFormatA(AudioSource, opt.get(), nullptr)) {
channels = 1;
bytes_per_sample = 2;
float_samples = false;
}
}
#endif
}
}
std::unique_ptr<agi::AudioProvider> CreateFFmpegSourceAudioProvider(agi::fs::path const& file, agi::BackgroundRunner *br) {
return agi::make_unique<FFmpegSourceAudioProvider>(file, br);
}
#endif /* WITH_FFMS2 */
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