diff options
Diffstat (limited to 'chromium/media/audio/sounds/wav_audio_handler.cc')
-rw-r--r-- | chromium/media/audio/sounds/wav_audio_handler.cc | 34 |
1 files changed, 19 insertions, 15 deletions
diff --git a/chromium/media/audio/sounds/wav_audio_handler.cc b/chromium/media/audio/sounds/wav_audio_handler.cc index 20eab8be437..b87baa8fd3f 100644 --- a/chromium/media/audio/sounds/wav_audio_handler.cc +++ b/chromium/media/audio/sounds/wav_audio_handler.cc @@ -33,14 +33,14 @@ const size_t kFmtChunkMinimumSize = 16; const size_t kAudioFormatOffset = 0; const size_t kChannelOffset = 2; const size_t kSampleRateOffset = 4; -const size_t kByteRateOffset = 8; const size_t kBitsPerSampleOffset = 14; // Some constants for audio format. const int kAudioFormatPCM = 1; // Reads an integer from |data| with |offset|. -template<typename T> T ReadInt(const base::StringPiece& data, size_t offset) { +template <typename T> +T ReadInt(const base::StringPiece& data, size_t offset) { CHECK_LE(offset + sizeof(T), data.size()); T result; memcpy(&result, data.data() + offset, sizeof(T)); @@ -57,7 +57,6 @@ namespace media { WavAudioHandler::WavAudioHandler(const base::StringPiece& wav_data) : num_channels_(0), sample_rate_(0), - byte_rate_(0), bits_per_sample_(0) { CHECK_LE(kWavFileHeaderSize, wav_data.size()) << "wav data is too small"; CHECK(wav_data.starts_with(kChunkId) && @@ -72,11 +71,17 @@ WavAudioHandler::WavAudioHandler(const base::StringPiece& wav_data) CHECK_LE(0, length) << "can't parse wav sub-chunk"; offset += length; } -} -WavAudioHandler::~WavAudioHandler() { + const int frame_count = data_.size() * 8 / num_channels_ / bits_per_sample_; + params_ = AudioParameters(AudioParameters::AUDIO_PCM_LOW_LATENCY, + GuessChannelLayout(num_channels_), + sample_rate_, + bits_per_sample_, + frame_count); } +WavAudioHandler::~WavAudioHandler() {} + bool WavAudioHandler::AtEnd(size_t cursor) const { return data_.size() <= cursor; } @@ -86,18 +91,20 @@ bool WavAudioHandler::CopyTo(AudioBus* bus, size_t* bytes_written) const { if (!bus) return false; - if (bus->channels() != num_channels_) { - LOG(ERROR) << "Number of channel mismatch."; + if (bus->channels() != params_.channels()) { + DVLOG(1) << "Number of channel mismatch."; return false; } if (AtEnd(cursor)) { bus->Zero(); return true; } - const int remaining_frames = (data_.size() - cursor) / bytes_per_frame_; + const int remaining_frames = + (data_.size() - cursor) / params_.GetBytesPerFrame(); const int frames = std::min(bus->frames(), remaining_frames); - bus->FromInterleaved(data_.data() + cursor, frames, bytes_per_sample_); - *bytes_written = frames * bytes_per_frame_; + bus->FromInterleaved(data_.data() + cursor, frames, + params_.bits_per_sample() / 8); + *bytes_written = frames * params_.GetBytesPerFrame(); bus->ZeroFramesPartial(frames, bus->frames() - frames); return true; } @@ -113,23 +120,20 @@ int WavAudioHandler::ParseSubChunk(const base::StringPiece& data) { if (!ParseDataChunk(data.substr(kChunkHeaderSize, chunk_length))) return -1; } else { - LOG(ERROR) << "Unknown data chunk: " << data.substr(0, 4) << "."; + DVLOG(1) << "Unknown data chunk: " << data.substr(0, 4) << "."; } return chunk_length + kChunkHeaderSize; } bool WavAudioHandler::ParseFmtChunk(const base::StringPiece& data) { if (data.size() < kFmtChunkMinimumSize) { - LOG(ERROR) << "Data size " << data.size() << " is too short."; + DLOG(ERROR) << "Data size " << data.size() << " is too short."; return false; } DCHECK_EQ(ReadInt<uint16>(data, kAudioFormatOffset), kAudioFormatPCM); num_channels_ = ReadInt<uint16>(data, kChannelOffset); sample_rate_ = ReadInt<uint32>(data, kSampleRateOffset); - byte_rate_ = ReadInt<uint32>(data, kByteRateOffset); bits_per_sample_ = ReadInt<uint16>(data, kBitsPerSampleOffset); - bytes_per_sample_ = bits_per_sample_ >> 3; - bytes_per_frame_ = num_channels_ * bytes_per_sample_; return true; } |