Aegisub/aegisub/src/audio_provider_ffmpegsource...

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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/
//
// $Id$
/// @file audio_provider_ffmpegsource.cpp
/// @brief ffms2-based audio provider
/// @ingroup audio_input ffms
///
#include "config.h"
#ifdef WITH_FFMS2
#ifndef AGI_PRE
#ifdef WIN32
#include <objbase.h>
#endif
#include <map>
#endif
#include "audio_provider_ffmpegsource.h"
#include "audio_controller.h"
#include "compat.h"
#include "main.h"
/// @brief Constructor
/// @param filename The filename to open
FFmpegSourceAudioProvider::FFmpegSourceAudioProvider(wxString filename) try
: AudioSource(NULL, FFMS_DestroyAudioSource)
{
ErrInfo.Buffer = FFMSErrMsg;
ErrInfo.BufferSize = sizeof(FFMSErrMsg);
ErrInfo.ErrorType = FFMS_ERROR_SUCCESS;
ErrInfo.SubType = FFMS_ERROR_SUCCESS;
SetLogLevel();
LoadAudio(filename);
}
catch (wxString const& err) {
throw agi::AudioProviderOpenError(STD_STR(err), 0);
}
catch (const char *err) {
throw agi::AudioProviderOpenError(err, 0);
}
void FFmpegSourceAudioProvider::LoadAudio(wxString filename) {
wxString FileNameShort = wxFileName(filename).GetShortPath();
FFMS_Indexer *Indexer = FFMS_CreateIndexer(FileNameShort.utf8_str(), &ErrInfo);
if (!Indexer)
throw agi::FileNotFoundError(ErrInfo.Buffer);
std::map<int,wxString> TrackList = GetTracksOfType(Indexer, FFMS_TYPE_AUDIO);
if (TrackList.size() <= 0)
throw agi::AudioDataNotFoundError("no audio tracks found", 0);
// 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) {
TrackNumber = AskForTrackSelection(TrackList, FFMS_TYPE_AUDIO);
// if it's still -1 here, user pressed cancel
if (TrackNumber == -1)
throw agi::UserCancelException("audio loading canceled by user");
}
// generate a name for the cache file
wxString CacheName = GetCacheFilename(filename);
// try to read index
agi::scoped_holder<FFMS_Index*, void (FFMS_CC*)(FFMS_Index*)>
Index(FFMS_ReadIndex(CacheName.utf8_str(), &ErrInfo), FFMS_DestroyIndex);
if (Index && FFMS_IndexBelongsToFile(Index, FileNameShort.utf8_str(), &ErrInfo))
Index = NULL;
// index valid but track number still not set?
if (Index) {
// track number not set? just grab the first track
if (TrackNumber < 0)
TrackNumber = FFMS_GetFirstTrackOfType(Index, FFMS_TYPE_AUDIO, &ErrInfo);
if (TrackNumber < 0)
throw agi::AudioDataNotFoundError(std::string("Couldn't find any audio tracks: ") + ErrInfo.Buffer, 0);
// index is valid and track number is now set,
// but do we have indexing info for the desired audio track?
FFMS_Track *TempTrackData = FFMS_GetTrackFromIndex(Index, TrackNumber);
if (FFMS_GetNumFrames(TempTrackData) <= 0)
Index = NULL;
}
// no valid index exists and the file only has one audio track, index it
else if (TrackNumber < 0)
TrackNumber = FFMS_TRACKMASK_ALL;
// else: do nothing (keep track mask as it is)
// moment of truth
if (!Index) {
int TrackMask;
if (OPT_GET("Provider/FFmpegSource/Index All Tracks")->GetBool() || TrackNumber == FFMS_TRACKMASK_ALL)
TrackMask = FFMS_TRACKMASK_ALL;
else
TrackMask = (1 << TrackNumber);
Index = DoIndexing(Indexer, CacheName, TrackMask, GetErrorHandlingMode());
// if tracknumber still isn't set we need to set it now
if (TrackNumber == FFMS_TRACKMASK_ALL)
TrackNumber = FFMS_GetFirstTrackOfType(Index, FFMS_TYPE_AUDIO, &ErrInfo);
}
// update access time of index file so it won't get cleaned away
if (!wxFileName(CacheName).Touch()) {
// warn user?
}
AudioSource = FFMS_CreateAudioSource(FileNameShort.utf8_str(), TrackNumber, Index, -1, &ErrInfo);
if (!AudioSource)
throw agi::AudioProviderOpenError(std::string("Failed to open audio track: ") + ErrInfo.Buffer, 0);
const FFMS_AudioProperties AudioInfo = *FFMS_GetAudioProperties(AudioSource);
channels = AudioInfo.Channels;
sample_rate = AudioInfo.SampleRate;
num_samples = AudioInfo.NumSamples;
if (channels <= 0 || sample_rate <= 0 || num_samples <= 0)
throw agi::AudioProviderOpenError("sanity check failed, consult your local psychiatrist", 0);
// FIXME: use the actual sample format too?
// why not just bits_per_sample/8? maybe there's some oddball format with half bytes out there somewhere...
switch (AudioInfo.BitsPerSample) {
case 8: bytes_per_sample = 1; break;
case 16: bytes_per_sample = 2; break;
case 24: bytes_per_sample = 3; break;
case 32: bytes_per_sample = 4; break;
default:
throw agi::AudioProviderOpenError("unknown or unsupported sample format", 0);
}
}
void FFmpegSourceAudioProvider::GetAudio(void *Buf, int64_t Start, int64_t Count) const {
if (FFMS_GetAudio(AudioSource, Buf, Start, Count, &ErrInfo)) {
throw AudioDecodeError(std::string("Failed to get audio samples: ") + ErrInfo.Buffer);
}
}
#endif /* WITH_FFMS2 */