content/media/wave/WaveReader.h@97036ab72558 (annotated)
content/media/wave/WaveReader.h
Tue, 06 Jan 2015 21:39:09 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Tue, 06 Jan 2015 21:39:09 +0100
- branch
- TOR_BUG_9701
- changeset 8
- 97036ab72558
- permissions
- -rw-r--r--
Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.
| michael@0 | 1 | /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ |
| michael@0 | 2 | /* vim:set ts=2 sw=2 sts=2 et cindent: */ |
| michael@0 | 3 | /* This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 4 | * License, v. 2.0. If a copy of the MPL was not distributed with this |
| michael@0 | 5 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| michael@0 | 6 | #if !defined(WaveReader_h_) |
| michael@0 | 7 | #define WaveReader_h_ |
| michael@0 | 8 | |
| michael@0 | 9 | #include "MediaDecoderReader.h" |
| michael@0 | 10 | #include "mozilla/dom/HTMLMediaElement.h" |
| michael@0 | 11 | |
| michael@0 | 12 | namespace mozilla { |
| michael@0 | 13 | namespace dom { |
| michael@0 | 14 | class TimeRanges; |
| michael@0 | 15 | } |
| michael@0 | 16 | } |
| michael@0 | 17 | |
| michael@0 | 18 | namespace mozilla { |
| michael@0 | 19 | |
| michael@0 | 20 | class WaveReader : public MediaDecoderReader |
| michael@0 | 21 | { |
| michael@0 | 22 | public: |
| michael@0 | 23 | WaveReader(AbstractMediaDecoder* aDecoder); |
| michael@0 | 24 | ~WaveReader(); |
| michael@0 | 25 | |
| michael@0 | 26 | virtual nsresult Init(MediaDecoderReader* aCloneDonor); |
| michael@0 | 27 | virtual bool DecodeAudioData(); |
| michael@0 | 28 | virtual bool DecodeVideoFrame(bool &aKeyframeSkip, |
| michael@0 | 29 | int64_t aTimeThreshold); |
| michael@0 | 30 | |
| michael@0 | 31 | virtual bool HasAudio() |
| michael@0 | 32 | { |
| michael@0 | 33 | return true; |
| michael@0 | 34 | } |
| michael@0 | 35 | |
| michael@0 | 36 | virtual bool HasVideo() |
| michael@0 | 37 | { |
| michael@0 | 38 | return false; |
| michael@0 | 39 | } |
| michael@0 | 40 | |
| michael@0 | 41 | virtual nsresult ReadMetadata(MediaInfo* aInfo, |
| michael@0 | 42 | MetadataTags** aTags); |
| michael@0 | 43 | virtual nsresult Seek(int64_t aTime, int64_t aStartTime, int64_t aEndTime, int64_t aCurrentTime); |
| michael@0 | 44 | virtual nsresult GetBuffered(dom::TimeRanges* aBuffered, int64_t aStartTime); |
| michael@0 | 45 | |
| michael@0 | 46 | // To seek in a buffered range, we just have to seek the stream. |
| michael@0 | 47 | virtual bool IsSeekableInBufferedRanges() { |
| michael@0 | 48 | return true; |
| michael@0 | 49 | } |
| michael@0 | 50 | |
| michael@0 | 51 | private: |
| michael@0 | 52 | bool ReadAll(char* aBuf, int64_t aSize, int64_t* aBytesRead = nullptr); |
| michael@0 | 53 | bool LoadRIFFChunk(); |
| michael@0 | 54 | bool GetNextChunk(uint32_t* aChunk, uint32_t* aChunkSize); |
| michael@0 | 55 | bool LoadFormatChunk(uint32_t aChunkSize); |
| michael@0 | 56 | bool FindDataOffset(uint32_t aChunkSize); |
| michael@0 | 57 | bool LoadListChunk(uint32_t aChunkSize, nsAutoPtr<dom::HTMLMediaElement::MetadataTags> &aTags); |
| michael@0 | 58 | bool LoadAllChunks(nsAutoPtr<dom::HTMLMediaElement::MetadataTags> &aTags); |
| michael@0 | 59 | |
| michael@0 | 60 | // Returns the number of seconds that aBytes represents based on the |
| michael@0 | 61 | // current audio parameters. e.g. 176400 bytes is 1 second at 16-bit |
| michael@0 | 62 | // stereo 44.1kHz. The time is rounded to the nearest microsecond. |
| michael@0 | 63 | double BytesToTime(int64_t aBytes) const; |
| michael@0 | 64 | |
| michael@0 | 65 | // Returns the number of bytes that aTime represents based on the current |
| michael@0 | 66 | // audio parameters. e.g. 1 second is 176400 bytes at 16-bit stereo |
| michael@0 | 67 | // 44.1kHz. |
| michael@0 | 68 | int64_t TimeToBytes(double aTime) const; |
| michael@0 | 69 | |
| michael@0 | 70 | // Rounds aBytes down to the nearest complete audio frame. Assumes |
| michael@0 | 71 | // beginning of byte range is already frame aligned by caller. |
| michael@0 | 72 | int64_t RoundDownToFrame(int64_t aBytes) const; |
| michael@0 | 73 | int64_t GetDataLength(); |
| michael@0 | 74 | int64_t GetPosition(); |
| michael@0 | 75 | |
| michael@0 | 76 | /* |
| michael@0 | 77 | Metadata extracted from the WAVE header. Used to initialize the audio |
| michael@0 | 78 | stream, and for byte<->time domain conversions. |
| michael@0 | 79 | */ |
| michael@0 | 80 | |
| michael@0 | 81 | // Number of samples per second. Limited to range [100, 96000] in LoadFormatChunk. |
| michael@0 | 82 | uint32_t mSampleRate; |
| michael@0 | 83 | |
| michael@0 | 84 | // Number of channels. Limited to range [1, 2] in LoadFormatChunk. |
| michael@0 | 85 | uint32_t mChannels; |
| michael@0 | 86 | |
| michael@0 | 87 | // Size of a single audio frame, which includes a sample for each channel |
| michael@0 | 88 | // (interleaved). |
| michael@0 | 89 | uint32_t mFrameSize; |
| michael@0 | 90 | |
| michael@0 | 91 | // The sample format of the PCM data. AudioStream::SampleFormat doesn't |
| michael@0 | 92 | // support U8. |
| michael@0 | 93 | enum { |
| michael@0 | 94 | FORMAT_U8, |
| michael@0 | 95 | FORMAT_S16 |
| michael@0 | 96 | } mSampleFormat; |
| michael@0 | 97 | |
| michael@0 | 98 | // Size of PCM data stored in the WAVE as reported by the data chunk in |
| michael@0 | 99 | // the media. |
| michael@0 | 100 | int64_t mWaveLength; |
| michael@0 | 101 | |
| michael@0 | 102 | // Start offset of the PCM data in the media stream. Extends mWaveLength |
| michael@0 | 103 | // bytes. |
| michael@0 | 104 | int64_t mWavePCMOffset; |
| michael@0 | 105 | }; |
| michael@0 | 106 | |
| michael@0 | 107 | } // namespace mozilla |
| michael@0 | 108 | |
| michael@0 | 109 | #endif |
