michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* vim:set ts=2 sw=2 sts=2 et cindent: */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: #if !defined(WaveReader_h_)
michael@0: #define WaveReader_h_
michael@0: 
michael@0: #include "MediaDecoderReader.h"
michael@0: #include "mozilla/dom/HTMLMediaElement.h"
michael@0: 
michael@0: namespace mozilla {
michael@0: namespace dom {
michael@0: class TimeRanges;
michael@0: }
michael@0: }
michael@0: 
michael@0: namespace mozilla {
michael@0: 
michael@0: class WaveReader : public MediaDecoderReader
michael@0: {
michael@0: public:
michael@0:   WaveReader(AbstractMediaDecoder* aDecoder);
michael@0:   ~WaveReader();
michael@0: 
michael@0:   virtual nsresult Init(MediaDecoderReader* aCloneDonor);
michael@0:   virtual bool DecodeAudioData();
michael@0:   virtual bool DecodeVideoFrame(bool &aKeyframeSkip,
michael@0:                                   int64_t aTimeThreshold);
michael@0: 
michael@0:   virtual bool HasAudio()
michael@0:   {
michael@0:     return true;
michael@0:   }
michael@0: 
michael@0:   virtual bool HasVideo()
michael@0:   {
michael@0:     return false;
michael@0:   }
michael@0: 
michael@0:   virtual nsresult ReadMetadata(MediaInfo* aInfo,
michael@0:                                 MetadataTags** aTags);
michael@0:   virtual nsresult Seek(int64_t aTime, int64_t aStartTime, int64_t aEndTime, int64_t aCurrentTime);
michael@0:   virtual nsresult GetBuffered(dom::TimeRanges* aBuffered, int64_t aStartTime);
michael@0: 
michael@0:   // To seek in a buffered range, we just have to seek the stream.
michael@0:   virtual bool IsSeekableInBufferedRanges() {
michael@0:     return true;
michael@0:   }
michael@0: 
michael@0: private:
michael@0:   bool ReadAll(char* aBuf, int64_t aSize, int64_t* aBytesRead = nullptr);
michael@0:   bool LoadRIFFChunk();
michael@0:   bool GetNextChunk(uint32_t* aChunk, uint32_t* aChunkSize);
michael@0:   bool LoadFormatChunk(uint32_t aChunkSize);
michael@0:   bool FindDataOffset(uint32_t aChunkSize);
michael@0:   bool LoadListChunk(uint32_t aChunkSize, nsAutoPtr<dom::HTMLMediaElement::MetadataTags> &aTags);
michael@0:   bool LoadAllChunks(nsAutoPtr<dom::HTMLMediaElement::MetadataTags> &aTags);
michael@0: 
michael@0:   // Returns the number of seconds that aBytes represents based on the
michael@0:   // current audio parameters.  e.g.  176400 bytes is 1 second at 16-bit
michael@0:   // stereo 44.1kHz. The time is rounded to the nearest microsecond.
michael@0:   double BytesToTime(int64_t aBytes) const;
michael@0: 
michael@0:   // Returns the number of bytes that aTime represents based on the current
michael@0:   // audio parameters.  e.g.  1 second is 176400 bytes at 16-bit stereo
michael@0:   // 44.1kHz.
michael@0:   int64_t TimeToBytes(double aTime) const;
michael@0: 
michael@0:   // Rounds aBytes down to the nearest complete audio frame.  Assumes
michael@0:   // beginning of byte range is already frame aligned by caller.
michael@0:   int64_t RoundDownToFrame(int64_t aBytes) const;
michael@0:   int64_t GetDataLength();
michael@0:   int64_t GetPosition();
michael@0: 
michael@0:   /*
michael@0:     Metadata extracted from the WAVE header.  Used to initialize the audio
michael@0:     stream, and for byte<->time domain conversions.
michael@0:   */
michael@0: 
michael@0:   // Number of samples per second.  Limited to range [100, 96000] in LoadFormatChunk.
michael@0:   uint32_t mSampleRate;
michael@0: 
michael@0:   // Number of channels.  Limited to range [1, 2] in LoadFormatChunk.
michael@0:   uint32_t mChannels;
michael@0: 
michael@0:   // Size of a single audio frame, which includes a sample for each channel
michael@0:   // (interleaved).
michael@0:   uint32_t mFrameSize;
michael@0: 
michael@0:   // The sample format of the PCM data. AudioStream::SampleFormat doesn't
michael@0:   // support U8.
michael@0:   enum {
michael@0:     FORMAT_U8,
michael@0:     FORMAT_S16
michael@0:   } mSampleFormat;
michael@0: 
michael@0:   // Size of PCM data stored in the WAVE as reported by the data chunk in
michael@0:   // the media.
michael@0:   int64_t mWaveLength;
michael@0: 
michael@0:   // Start offset of the PCM data in the media stream.  Extends mWaveLength
michael@0:   // bytes.
michael@0:   int64_t mWavePCMOffset;
michael@0: };
michael@0: 
michael@0: } // namespace mozilla
michael@0: 
michael@0: #endif