C++ (Cpp) AudioOpenError 예제들

예제 #1

/// @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;
}

예제 #2

/// @brief Load audio file 
/// @param filename 
///
void FFmpegSourceAudioProvider::LoadAudio(std::string filename) {
//	wxString FileNameShort = wxFileName(filename).GetShortPath();

	FFMS_Indexer *Indexer = FFMS_CreateIndexer(filename.c_str(), &ErrInfo);
	if (Indexer == NULL) {
		throw agi::FileNotFoundError(ErrInfo.Buffer);
	}

	std::map<int,std::string> TrackList = GetTracksOfType(Indexer, FFMS_TYPE_AUDIO);
	if (TrackList.size() <= 0)
		throw AudioOpenError("no audio tracks found");

	// 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 cancelled by user");
	}

	// generate a name for the cache file
	std::string CacheName = GetCacheFilename(filename);

	// try to read index
	FFMS_Index *Index = NULL;
	Index = FFMS_ReadIndex(CacheName.c_str(), &ErrInfo);
	bool IndexIsValid = false;
	if (Index != NULL) {
		if (FFMS_IndexBelongsToFile(Index, filename.c_str(), &ErrInfo)) {
			FFMS_DestroyIndex(Index);
			Index = NULL;
		}
		else
			IndexIsValid = true;
	}
	
	// index valid but track number still not set?
	if (IndexIsValid) {
		// track number not set? just grab the first track
		if (TrackNumber < 0)
			TrackNumber = FFMS_GetFirstTrackOfType(Index, FFMS_TYPE_AUDIO, &ErrInfo);
		if (TrackNumber < 0) {
			FFMS_DestroyIndex(Index);
			Index = NULL;
			throw AudioOpenError(std::string("Couldn't find any audio tracks: ") + ErrInfo.Buffer);
		}

		// 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) {
			IndexIsValid = false;
			FFMS_DestroyIndex(Index);
			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 (!IndexIsValid) {
		int TrackMask;
//		if (OPT_GET("Provider/FFmpegSource/Index All Tracks")->GetBool() || TrackNumber == FFMS_TRACKMASK_ALL)
		if (TrackNumber == FFMS_TRACKMASK_ALL)
			TrackMask = FFMS_TRACKMASK_ALL;
		else
			TrackMask = (1 << TrackNumber);

		try {
			Index = DoIndexing(Indexer, CacheName, TrackMask, GetErrorHandlingMode());
		}
		catch (std::string const& err) {
			throw AudioOpenError(err);
		}

		// 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
///XXX: Add something to libaegisub to support this.
//	if (!wxFileName(CacheName).Touch()) {
		// warn user?
//	}

#if FFMS_VERSION >= ((2 << 24) | (14 << 16) | (1 << 8) | 0)
	AudioSource = FFMS_CreateAudioSource(filename.c_str(), TrackNumber, Index, -1, &ErrInfo);
#else
	AudioSource = FFMS_CreateAudioSource(filename.c_str(), TrackNumber, Index, &ErrInfo);
#endif
	FFMS_DestroyIndex(Index);
	Index = NULL;
	if (!AudioSource) {
		throw AudioOpenError(std::string("Failed to open audio track: %s") + ErrInfo.Buffer);
	}

	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 AudioOpenError("sanity check failed, consult your local psychiatrist");

	// 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 AudioOpenError("unknown or unsupported sample format");
	}
}