1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/content/media/wave/WaveReader.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,109 @@
1.4 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* vim:set ts=2 sw=2 sts=2 et cindent: */
1.6 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.8 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.9 +#if !defined(WaveReader_h_)
1.10 +#define WaveReader_h_
1.11 +
1.12 +#include "MediaDecoderReader.h"
1.13 +#include "mozilla/dom/HTMLMediaElement.h"
1.14 +
1.15 +namespace mozilla {
1.16 +namespace dom {
1.17 +class TimeRanges;
1.18 +}
1.19 +}
1.20 +
1.21 +namespace mozilla {
1.22 +
1.23 +class WaveReader : public MediaDecoderReader
1.24 +{
1.25 +public:
1.26 + WaveReader(AbstractMediaDecoder* aDecoder);
1.27 + ~WaveReader();
1.28 +
1.29 + virtual nsresult Init(MediaDecoderReader* aCloneDonor);
1.30 + virtual bool DecodeAudioData();
1.31 + virtual bool DecodeVideoFrame(bool &aKeyframeSkip,
1.32 + int64_t aTimeThreshold);
1.33 +
1.34 + virtual bool HasAudio()
1.35 + {
1.36 + return true;
1.37 + }
1.38 +
1.39 + virtual bool HasVideo()
1.40 + {
1.41 + return false;
1.42 + }
1.43 +
1.44 + virtual nsresult ReadMetadata(MediaInfo* aInfo,
1.45 + MetadataTags** aTags);
1.46 + virtual nsresult Seek(int64_t aTime, int64_t aStartTime, int64_t aEndTime, int64_t aCurrentTime);
1.47 + virtual nsresult GetBuffered(dom::TimeRanges* aBuffered, int64_t aStartTime);
1.48 +
1.49 + // To seek in a buffered range, we just have to seek the stream.
1.50 + virtual bool IsSeekableInBufferedRanges() {
1.51 + return true;
1.52 + }
1.53 +
1.54 +private:
1.55 + bool ReadAll(char* aBuf, int64_t aSize, int64_t* aBytesRead = nullptr);
1.56 + bool LoadRIFFChunk();
1.57 + bool GetNextChunk(uint32_t* aChunk, uint32_t* aChunkSize);
1.58 + bool LoadFormatChunk(uint32_t aChunkSize);
1.59 + bool FindDataOffset(uint32_t aChunkSize);
1.60 + bool LoadListChunk(uint32_t aChunkSize, nsAutoPtr<dom::HTMLMediaElement::MetadataTags> &aTags);
1.61 + bool LoadAllChunks(nsAutoPtr<dom::HTMLMediaElement::MetadataTags> &aTags);
1.62 +
1.63 + // Returns the number of seconds that aBytes represents based on the
1.64 + // current audio parameters. e.g. 176400 bytes is 1 second at 16-bit
1.65 + // stereo 44.1kHz. The time is rounded to the nearest microsecond.
1.66 + double BytesToTime(int64_t aBytes) const;
1.67 +
1.68 + // Returns the number of bytes that aTime represents based on the current
1.69 + // audio parameters. e.g. 1 second is 176400 bytes at 16-bit stereo
1.70 + // 44.1kHz.
1.71 + int64_t TimeToBytes(double aTime) const;
1.72 +
1.73 + // Rounds aBytes down to the nearest complete audio frame. Assumes
1.74 + // beginning of byte range is already frame aligned by caller.
1.75 + int64_t RoundDownToFrame(int64_t aBytes) const;
1.76 + int64_t GetDataLength();
1.77 + int64_t GetPosition();
1.78 +
1.79 + /*
1.80 + Metadata extracted from the WAVE header. Used to initialize the audio
1.81 + stream, and for byte<->time domain conversions.
1.82 + */
1.83 +
1.84 + // Number of samples per second. Limited to range [100, 96000] in LoadFormatChunk.
1.85 + uint32_t mSampleRate;
1.86 +
1.87 + // Number of channels. Limited to range [1, 2] in LoadFormatChunk.
1.88 + uint32_t mChannels;
1.89 +
1.90 + // Size of a single audio frame, which includes a sample for each channel
1.91 + // (interleaved).
1.92 + uint32_t mFrameSize;
1.93 +
1.94 + // The sample format of the PCM data. AudioStream::SampleFormat doesn't
1.95 + // support U8.
1.96 + enum {
1.97 + FORMAT_U8,
1.98 + FORMAT_S16
1.99 + } mSampleFormat;
1.100 +
1.101 + // Size of PCM data stored in the WAVE as reported by the data chunk in
1.102 + // the media.
1.103 + int64_t mWaveLength;
1.104 +
1.105 + // Start offset of the PCM data in the media stream. Extends mWaveLength
1.106 + // bytes.
1.107 + int64_t mWavePCMOffset;
1.108 +};
1.109 +
1.110 +} // namespace mozilla
1.111 +
1.112 +#endif
