Aegisub/aegisub/audio_provider_ffmpegsource.cpp

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// Copyright (c) 2008, 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
//
// Website: http://aegisub.cellosoft.com
// Contact: mailto:zeratul@cellosoft.com
//
#ifdef WITH_FFMPEGSOURCE
///////////
// Headers
#include "audio_provider_ffmpegsource.h"
///////////
// Constructor
FFmpegSourceAudioProvider::FFmpegSourceAudioProvider(Aegisub::String filename) {
FFMS_Init();
MsgSize = sizeof(FFMSErrMsg);
MsgString = _T("FFmpegSource audio provider: ");
AudioSource = NULL;
Index = NULL;
try {
LoadAudio(filename);
} catch (...) {
Close();
throw;
}
}
///////////
// Load audio file
void FFmpegSourceAudioProvider::LoadAudio(Aegisub::String filename) {
// clean up
Close();
wxString FileNameWX(filename.c_str(), wxConvFile);
// generate a default name for the cache file
wxString CacheName = GetCacheFilename(filename);
FrameIndex *Index;
Index = FFMS_ReadIndex(CacheName.char_str(), FFMSErrMsg, MsgSize);
if (Index == NULL) {
// index didn't exist or was invalid, we'll have to (re)create it
try {
Index = DoIndexing(Index, FileNameWX, CacheName, FFMSTrackMaskAll, false);
} catch (wxString temp) {
MsgString << temp;
throw MsgString;
} catch (...) {
throw;
}
} else {
// index exists, but does it have indexing info for the audio track(s)?
int NumTracks = FFMS_GetNumTracks(Index);
if (NumTracks <= 0)
throw _T("FFmpegSource audio provider: no tracks found in index file");
for (int i = 0; i < NumTracks; i++) {
FrameInfoVector *FrameData = FFMS_GetTITrackIndex(Index, i, FFMSErrMsg, MsgSize);
if (FrameData == NULL) {
wxString temp(FFMSErrMsg, wxConvUTF8);
MsgString << _T("Couldn't get track data: ") << temp;
throw MsgString;
}
// does the track have any indexed frames?
if (FFMS_GetNumFrames(FrameData) <= 0 && (FFMS_GetTrackType(FrameData) == FFMS_TYPE_AUDIO)) {
// found an unindexed audio track, we'll need to reindex
try {
Index = DoIndexing(Index, FileNameWX, CacheName, FFMSTrackMaskAll, false);
} catch (wxString temp) {
MsgString << temp;
throw MsgString;
} catch (...) {
throw;
}
// don't reindex more than once
break;
}
}
}
// FIXME: provide a way to choose which audio track to load?
int TrackNumber = FFMS_GetFirstTrackOfType(Index, FFMS_TYPE_AUDIO, FFMSErrMsg, MsgSize);
if (TrackNumber < 0) {
wxString temp(FFMSErrMsg, wxConvUTF8);
MsgString << _T("Couldn't find any audio tracks: ") << temp;
throw MsgString;
}
AudioSource = FFMS_CreateAudioSource(FileNameWX.char_str(), TrackNumber, Index, FFMSErrMsg, MsgSize);
if (!AudioSource) {
wxString temp(FFMSErrMsg, wxConvUTF8);
MsgString << _T("Failed to open audio track: ") << temp;
throw MsgString;
}
const AudioProperties AudioInfo = *FFMS_GetAudioProperties(AudioSource);
if (AudioInfo.Float)
throw _T("FFmpegSource audio provider: I don't know what to do with floating point audio");
channels = AudioInfo.Channels;
sample_rate = AudioInfo.SampleRate;
num_samples = AudioInfo.NumSamples;
if (channels <= 0 || sample_rate <= 0 || num_samples <= 0)
throw _T("FFmpegSource audio provider: sanity check failed, consult your local psychiatrist");
// 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 _T("FFmpegSource audio provider: unknown or unsupported sample format");
}
}
///////////
// Destructor
FFmpegSourceAudioProvider::~FFmpegSourceAudioProvider() {
Close();
}
///////////
// Clean up
void FFmpegSourceAudioProvider::Close() {
if (AudioSource)
FFMS_DestroyAudioSource(AudioSource);
AudioSource = NULL;
if (Index)
FFMS_DestroyFrameIndex(Index);
Index = NULL;
}
///////////
// Get audio
void FFmpegSourceAudioProvider::GetAudio(void *Buf, int64_t Start, int64_t Count) {
if (FFMS_GetAudio(AudioSource, Buf, Start, Count, FFMSErrMsg, MsgSize)) {
wxString temp(FFMSErrMsg, wxConvUTF8);
MsgString << _T("Failed to get audio samples: ") << temp;
throw MsgString;
}
}
#endif /* WITH_FFMPEGSOURCE */