forked from mia/Aegisub
a30d6121fd
Simply zero the memory for audio which hasn't been decoded yet, modify the audio renderer to avoid caching blocks which aren't ready yet, and add a progress indiciator to the audio display scrollbar.
213 lines
8 KiB
C++
213 lines
8 KiB
C++
// Copyright (c) 2008-2009, Karl Blomster
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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//
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// * Redistributions of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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// * Neither the name of the Aegisub Group nor the names of its contributors
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// may be used to endorse or promote products derived from this software
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// without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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// POSSIBILITY OF SUCH DAMAGE.
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//
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// Aegisub Project http://www.aegisub.org/
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/// @file audio_provider_ffmpegsource.cpp
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/// @brief ffms2-based audio provider
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/// @ingroup audio_input ffms
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///
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#ifdef WITH_FFMS2
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#include "include/aegisub/audio_provider.h"
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#include "audio_controller.h"
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#include "ffmpegsource_common.h"
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#include "options.h"
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#include <libaegisub/fs.h>
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#include <libaegisub/util.h>
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#include <map>
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namespace {
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class FFmpegSourceAudioProvider final : public AudioProvider, FFmpegSourceProvider {
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/// audio source object
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agi::scoped_holder<FFMS_AudioSource*, void (FFMS_CC *)(FFMS_AudioSource*)> AudioSource;
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mutable char FFMSErrMsg[1024]; ///< FFMS error message
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mutable FFMS_ErrorInfo ErrInfo; ///< FFMS error codes/messages
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void LoadAudio(agi::fs::path const& filename);
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void FillBuffer(void *Buf, int64_t Start, int64_t Count) const override {
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if (FFMS_GetAudio(AudioSource, Buf, Start, Count, &ErrInfo))
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throw AudioDecodeError(std::string("Failed to get audio samples: ") + ErrInfo.Buffer);
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}
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public:
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FFmpegSourceAudioProvider(agi::fs::path const& filename, agi::BackgroundRunner *br);
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bool NeedsCache() const override { return true; }
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};
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/// @brief Constructor
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/// @param filename The filename to open
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FFmpegSourceAudioProvider::FFmpegSourceAudioProvider(agi::fs::path const& filename, agi::BackgroundRunner *br) try
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: FFmpegSourceProvider(br)
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, AudioSource(nullptr, FFMS_DestroyAudioSource)
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{
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ErrInfo.Buffer = FFMSErrMsg;
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ErrInfo.BufferSize = sizeof(FFMSErrMsg);
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ErrInfo.ErrorType = FFMS_ERROR_SUCCESS;
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ErrInfo.SubType = FFMS_ERROR_SUCCESS;
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SetLogLevel();
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LoadAudio(filename);
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}
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catch (std::string const& err) {
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throw agi::AudioProviderOpenError(err, nullptr);
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}
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catch (const char *err) {
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throw agi::AudioProviderOpenError(err, nullptr);
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}
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void FFmpegSourceAudioProvider::LoadAudio(agi::fs::path const& filename) {
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FFMS_Indexer *Indexer = FFMS_CreateIndexer(filename.string().c_str(), &ErrInfo);
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if (!Indexer) {
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if (ErrInfo.SubType == FFMS_ERROR_FILE_READ)
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throw agi::fs::FileNotFound(std::string(ErrInfo.Buffer));
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else
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throw agi::AudioDataNotFoundError(ErrInfo.Buffer, nullptr);
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}
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std::map<int, std::string> TrackList = GetTracksOfType(Indexer, FFMS_TYPE_AUDIO);
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if (TrackList.empty())
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throw agi::AudioDataNotFoundError("no audio tracks found", nullptr);
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// initialize the track number to an invalid value so we can detect later on
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// whether the user actually had to choose a track or not
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int TrackNumber = -1;
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if (TrackList.size() > 1) {
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TrackNumber = AskForTrackSelection(TrackList, FFMS_TYPE_AUDIO);
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// if it's still -1 here, user pressed cancel
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if (TrackNumber == -1)
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throw agi::UserCancelException("audio loading canceled by user");
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}
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// generate a name for the cache file
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agi::fs::path CacheName = GetCacheFilename(filename);
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// try to read index
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agi::scoped_holder<FFMS_Index*, void (FFMS_CC*)(FFMS_Index*)>
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Index(FFMS_ReadIndex(CacheName.string().c_str(), &ErrInfo), FFMS_DestroyIndex);
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if (Index && FFMS_IndexBelongsToFile(Index, filename.string().c_str(), &ErrInfo))
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Index = nullptr;
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// index valid but track number still not set?
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if (Index) {
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// track number not set? just grab the first track
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if (TrackNumber < 0)
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TrackNumber = FFMS_GetFirstTrackOfType(Index, FFMS_TYPE_AUDIO, &ErrInfo);
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if (TrackNumber < 0)
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throw agi::AudioDataNotFoundError(std::string("Couldn't find any audio tracks: ") + ErrInfo.Buffer, nullptr);
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// index is valid and track number is now set,
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// but do we have indexing info for the desired audio track?
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FFMS_Track *TempTrackData = FFMS_GetTrackFromIndex(Index, TrackNumber);
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if (FFMS_GetNumFrames(TempTrackData) <= 0)
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Index = nullptr;
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}
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// no valid index exists and the file only has one audio track, index it
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else if (TrackNumber < 0)
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TrackNumber = FFMS_TRACKMASK_ALL;
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// else: do nothing (keep track mask as it is)
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// reindex if the error handling mode has changed
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FFMS_IndexErrorHandling ErrorHandling = GetErrorHandlingMode();
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#if FFMS_VERSION >= ((2 << 24) | (17 << 16) | (2 << 8) | 0)
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if (Index && FFMS_GetErrorHandling(Index) != ErrorHandling)
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Index = nullptr;
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#endif
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// moment of truth
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if (!Index) {
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int TrackMask;
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if (OPT_GET("Provider/FFmpegSource/Index All Tracks")->GetBool() || TrackNumber == FFMS_TRACKMASK_ALL)
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TrackMask = FFMS_TRACKMASK_ALL;
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else
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TrackMask = (1 << TrackNumber);
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Index = DoIndexing(Indexer, CacheName, TrackMask, ErrorHandling);
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// if tracknumber still isn't set we need to set it now
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if (TrackNumber == FFMS_TRACKMASK_ALL)
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TrackNumber = FFMS_GetFirstTrackOfType(Index, FFMS_TYPE_AUDIO, &ErrInfo);
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}
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else
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FFMS_CancelIndexing(Indexer);
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// update access time of index file so it won't get cleaned away
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agi::fs::Touch(CacheName);
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AudioSource = FFMS_CreateAudioSource(filename.string().c_str(), TrackNumber, Index, -1, &ErrInfo);
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if (!AudioSource)
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throw agi::AudioProviderOpenError(std::string("Failed to open audio track: ") + ErrInfo.Buffer, nullptr);
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const FFMS_AudioProperties AudioInfo = *FFMS_GetAudioProperties(AudioSource);
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channels = AudioInfo.Channels;
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sample_rate = AudioInfo.SampleRate;
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num_samples = AudioInfo.NumSamples;
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decoded_samples = AudioInfo.NumSamples;
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if (channels <= 0 || sample_rate <= 0 || num_samples <= 0)
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throw agi::AudioProviderOpenError("sanity check failed, consult your local psychiatrist", nullptr);
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switch (AudioInfo.SampleFormat) {
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case FFMS_FMT_U8: bytes_per_sample = 1; float_samples = false; break;
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case FFMS_FMT_S16: bytes_per_sample = 2; float_samples = false; break;
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case FFMS_FMT_S32: bytes_per_sample = 4; float_samples = false; break;
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case FFMS_FMT_FLT: bytes_per_sample = 4; float_samples = true; break;
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case FFMS_FMT_DBL: bytes_per_sample = 8; float_samples = true; break;
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default:
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throw agi::AudioProviderOpenError("unknown or unsupported sample format", nullptr);
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}
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#if FFMS_VERSION >= ((2 << 24) | (17 << 16) | (4 << 8) | 0)
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if (channels > 1 || bytes_per_sample != 2) {
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std::unique_ptr<FFMS_ResampleOptions, decltype(&FFMS_DestroyResampleOptions)>
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opt(FFMS_CreateResampleOptions(AudioSource), FFMS_DestroyResampleOptions);
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opt->ChannelLayout = FFMS_CH_FRONT_CENTER;
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opt->SampleFormat = FFMS_FMT_S16;
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// Might fail if FFMS2 wasn't built with libavresample
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if (!FFMS_SetOutputFormatA(AudioSource, opt.get(), nullptr)) {
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channels = 1;
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bytes_per_sample = 2;
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float_samples = false;
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}
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}
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#endif
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}
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}
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std::unique_ptr<AudioProvider> CreateFFmpegSourceAudioProvider(agi::fs::path const& file, agi::BackgroundRunner *br) {
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return agi::util::make_unique<FFmpegSourceAudioProvider>(file, br);
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}
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#endif /* WITH_FFMS2 */
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