Result SoundSourceM4A::tryOpen(const AudioSourceConfig& audioSrcCfg) { DEBUG_ASSERT(MP4_INVALID_FILE_HANDLE == m_hFile); /* open MP4 file, check for >= ver 1.9.1 */ #if MP4V2_PROJECT_version_hex <= 0x00010901 m_hFile = MP4Read(getLocalFileNameBytes().constData(), 0); #else m_hFile = MP4Read(getLocalFileNameBytes().constData()); #endif if (MP4_INVALID_FILE_HANDLE == m_hFile) { qWarning() << "Failed to open file for reading:" << getUrlString(); return ERR; } m_trackId = findFirstAudioTrackId(m_hFile); if (MP4_INVALID_TRACK_ID == m_trackId) { qWarning() << "No AAC track found:" << getUrlString(); return ERR; } const MP4SampleId numberOfSamples = MP4GetTrackNumberOfSamples(m_hFile, m_trackId); if (0 >= numberOfSamples) { qWarning() << "Failed to read number of samples from file:" << getUrlString(); return ERR; } m_maxSampleBlockId = kSampleBlockIdMin + (numberOfSamples - 1); // Determine the maximum input size (in bytes) of a // sample block for the selected track. const u_int32_t maxSampleBlockInputSize = MP4GetTrackMaxSampleSize(m_hFile, m_trackId); m_inputBuffer.resize(maxSampleBlockInputSize, 0); DEBUG_ASSERT(NULL == m_hDecoder); // not already opened m_hDecoder = NeAACDecOpen(); if (!m_hDecoder) { qWarning() << "Failed to open the AAC decoder!"; return ERR; } NeAACDecConfigurationPtr pDecoderConfig = NeAACDecGetCurrentConfiguration( m_hDecoder); pDecoderConfig->outputFormat = FAAD_FMT_FLOAT; if ((kChannelCountMono == audioSrcCfg.channelCountHint) || (kChannelCountStereo == audioSrcCfg.channelCountHint)) { pDecoderConfig->downMatrix = 1; } else { pDecoderConfig->downMatrix = 0; } pDecoderConfig->defObjectType = LC; if (!NeAACDecSetConfiguration(m_hDecoder, pDecoderConfig)) { qWarning() << "Failed to configure AAC decoder!"; return ERR; } u_int8_t* configBuffer = NULL; u_int32_t configBufferSize = 0; if (!MP4GetTrackESConfiguration(m_hFile, m_trackId, &configBuffer, &configBufferSize)) { /* failed to get mpeg-4 audio config... this is ok. * NeAACDecInit2() will simply use default values instead. */ qWarning() << "Failed to read the MP4 audio configuration." << "Continuing with default values."; } SAMPLERATE_TYPE sampleRate; unsigned char channelCount; if (0 > NeAACDecInit2(m_hDecoder, configBuffer, configBufferSize, &sampleRate, &channelCount)) { free(configBuffer); qWarning() << "Failed to initialize the AAC decoder!"; return ERR; } else { free(configBuffer); } setChannelCount(channelCount); setFrameRate(sampleRate); setFrameCount(getFrameCountForSampleBlockId(m_maxSampleBlockId)); // Resize temporary buffer for decoded sample data const SINT sampleBufferCapacity = frames2samples(kFramesPerSampleBlock); m_sampleBuffer.resetCapacity(sampleBufferCapacity); // Invalidate current position to enforce the following // seek operation m_curFrameIndex = getMaxFrameIndex(); // (Re-)Start decoding at the beginning of the file seekSampleFrame(getMinFrameIndex()); return OK; }
Result SoundSourceM4A::tryOpen(const AudioSourceConfig& audioSrcCfg) { DEBUG_ASSERT(MP4_INVALID_FILE_HANDLE == m_hFile); // open MP4 file, check for >= ver 1.9.1 // From mp4v2/file.h: // * On Windows, this should be a UTF-8 encoded string. // * On other platforms, it should be an 8-bit encoding that is // * appropriate for the platform, locale, file system, etc. // * (prefer to use UTF-8 when possible). #if MP4V2_PROJECT_version_hex <= 0x00010901 m_hFile = MP4Read(getLocalFileName().toUtf8().constData(), 0); #else m_hFile = MP4Read(getLocalFileName().toUtf8().constData()); #endif if (MP4_INVALID_FILE_HANDLE == m_hFile) { qWarning() << "Failed to open file for reading:" << getUrlString(); return ERR; } m_trackId = findFirstAudioTrackId(m_hFile); if (MP4_INVALID_TRACK_ID == m_trackId) { qWarning() << "No AAC track found:" << getUrlString(); return ERR; } // Read fixed sample duration. If the sample duration is not // fixed (that is, if the number of frames per sample block varies // through the file), the call returns MP4_INVALID_DURATION. We // can't currently handle these. m_framesPerSampleBlock = MP4GetTrackFixedSampleDuration(m_hFile, m_trackId); if (MP4_INVALID_DURATION == m_framesPerSampleBlock) { qWarning() << "Unable to decode tracks with non-fixed sample durations: " << getUrlString(); return ERR; } const MP4SampleId numberOfSamples = MP4GetTrackNumberOfSamples(m_hFile, m_trackId); if (0 >= numberOfSamples) { qWarning() << "Failed to read number of samples from file:" << getUrlString(); return ERR; } m_maxSampleBlockId = kSampleBlockIdMin + (numberOfSamples - 1); // Determine the maximum input size (in bytes) of a // sample block for the selected track. const u_int32_t maxSampleBlockInputSize = MP4GetTrackMaxSampleSize(m_hFile, m_trackId); m_inputBuffer.resize(maxSampleBlockInputSize, 0); DEBUG_ASSERT(nullptr == m_hDecoder); // not already opened m_hDecoder = NeAACDecOpen(); if (!m_hDecoder) { qWarning() << "Failed to open the AAC decoder!"; return ERR; } NeAACDecConfigurationPtr pDecoderConfig = NeAACDecGetCurrentConfiguration( m_hDecoder); pDecoderConfig->outputFormat = FAAD_FMT_FLOAT; if ((kChannelCountMono == audioSrcCfg.channelCountHint) || (kChannelCountStereo == audioSrcCfg.channelCountHint)) { pDecoderConfig->downMatrix = 1; } else { pDecoderConfig->downMatrix = 0; } pDecoderConfig->defObjectType = LC; if (!NeAACDecSetConfiguration(m_hDecoder, pDecoderConfig)) { qWarning() << "Failed to configure AAC decoder!"; return ERR; } u_int8_t* configBuffer = nullptr; u_int32_t configBufferSize = 0; if (!MP4GetTrackESConfiguration(m_hFile, m_trackId, &configBuffer, &configBufferSize)) { /* failed to get mpeg-4 audio config... this is ok. * NeAACDecInit2() will simply use default values instead. */ qWarning() << "Failed to read the MP4 audio configuration." << "Continuing with default values."; } SAMPLERATE_TYPE sampleRate; unsigned char channelCount; if (0 > NeAACDecInit2(m_hDecoder, configBuffer, configBufferSize, &sampleRate, &channelCount)) { free(configBuffer); qWarning() << "Failed to initialize the AAC decoder!"; return ERR; } else { free(configBuffer); } // Calculate how many sample blocks we need to decode in advance // of a random seek in order to get the recommended number of // prefetch frames m_numberOfPrefetchSampleBlocks = (kNumberOfPrefetchFrames + (m_framesPerSampleBlock - 1)) / m_framesPerSampleBlock; setChannelCount(channelCount); setFrameRate(sampleRate); setFrameCount(((m_maxSampleBlockId - kSampleBlockIdMin) + 1) * m_framesPerSampleBlock); // Resize temporary buffer for decoded sample data const SINT sampleBufferCapacity = frames2samples(m_framesPerSampleBlock); m_sampleBuffer.resetCapacity(sampleBufferCapacity); // Invalidate current position to enforce the following // seek operation m_curFrameIndex = getMaxFrameIndex(); // (Re-)Start decoding at the beginning of the file seekSampleFrame(getMinFrameIndex()); return OK; }