The Tor Browser / file comparison
comparison: content/media/wave/WaveReader.h
content/media/wave/WaveReader.h
- branch
- TOR_BUG_9701
- changeset 13
- 44a2da4a2ab2
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| -1:000000000000 | 0:599feff375fe |
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| 1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ | |
| 2 /* vim:set ts=2 sw=2 sts=2 et cindent: */ | |
| 3 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 4 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 6 #if !defined(WaveReader_h_) | |
| 7 #define WaveReader_h_ | |
| 8 | |
| 9 #include "MediaDecoderReader.h" | |
| 10 #include "mozilla/dom/HTMLMediaElement.h" | |
| 11 | |
| 12 namespace mozilla { | |
| 13 namespace dom { | |
| 14 class TimeRanges; | |
| 15 } | |
| 16 } | |
| 17 | |
| 18 namespace mozilla { | |
| 19 | |
| 20 class WaveReader : public MediaDecoderReader | |
| 21 { | |
| 22 public: | |
| 23 WaveReader(AbstractMediaDecoder* aDecoder); | |
| 24 ~WaveReader(); | |
| 25 | |
| 26 virtual nsresult Init(MediaDecoderReader* aCloneDonor); | |
| 27 virtual bool DecodeAudioData(); | |
| 28 virtual bool DecodeVideoFrame(bool &aKeyframeSkip, | |
| 29 int64_t aTimeThreshold); | |
| 30 | |
| 31 virtual bool HasAudio() | |
| 32 { | |
| 33 return true; | |
| 34 } | |
| 35 | |
| 36 virtual bool HasVideo() | |
| 37 { | |
| 38 return false; | |
| 39 } | |
| 40 | |
| 41 virtual nsresult ReadMetadata(MediaInfo* aInfo, | |
| 42 MetadataTags** aTags); | |
| 43 virtual nsresult Seek(int64_t aTime, int64_t aStartTime, int64_t aEndTime, int64_t aCurrentTime); | |
| 44 virtual nsresult GetBuffered(dom::TimeRanges* aBuffered, int64_t aStartTime); | |
| 45 | |
| 46 // To seek in a buffered range, we just have to seek the stream. | |
| 47 virtual bool IsSeekableInBufferedRanges() { | |
| 48 return true; | |
| 49 } | |
| 50 | |
| 51 private: | |
| 52 bool ReadAll(char* aBuf, int64_t aSize, int64_t* aBytesRead = nullptr); | |
| 53 bool LoadRIFFChunk(); | |
| 54 bool GetNextChunk(uint32_t* aChunk, uint32_t* aChunkSize); | |
| 55 bool LoadFormatChunk(uint32_t aChunkSize); | |
| 56 bool FindDataOffset(uint32_t aChunkSize); | |
| 57 bool LoadListChunk(uint32_t aChunkSize, nsAutoPtr<dom::HTMLMediaElement::MetadataTags> &aTags); | |
| 58 bool LoadAllChunks(nsAutoPtr<dom::HTMLMediaElement::MetadataTags> &aTags); | |
| 59 | |
| 60 // Returns the number of seconds that aBytes represents based on the | |
| 61 // current audio parameters. e.g. 176400 bytes is 1 second at 16-bit | |
| 62 // stereo 44.1kHz. The time is rounded to the nearest microsecond. | |
| 63 double BytesToTime(int64_t aBytes) const; | |
| 64 | |
| 65 // Returns the number of bytes that aTime represents based on the current | |
| 66 // audio parameters. e.g. 1 second is 176400 bytes at 16-bit stereo | |
| 67 // 44.1kHz. | |
| 68 int64_t TimeToBytes(double aTime) const; | |
| 69 | |
| 70 // Rounds aBytes down to the nearest complete audio frame. Assumes | |
| 71 // beginning of byte range is already frame aligned by caller. | |
| 72 int64_t RoundDownToFrame(int64_t aBytes) const; | |
| 73 int64_t GetDataLength(); | |
| 74 int64_t GetPosition(); | |
| 75 | |
| 76 /* | |
| 77 Metadata extracted from the WAVE header. Used to initialize the audio | |
| 78 stream, and for byte<->time domain conversions. | |
| 79 */ | |
| 80 | |
| 81 // Number of samples per second. Limited to range [100, 96000] in LoadFormatChunk. | |
| 82 uint32_t mSampleRate; | |
| 83 | |
| 84 // Number of channels. Limited to range [1, 2] in LoadFormatChunk. | |
| 85 uint32_t mChannels; | |
| 86 | |
| 87 // Size of a single audio frame, which includes a sample for each channel | |
| 88 // (interleaved). | |
| 89 uint32_t mFrameSize; | |
| 90 | |
| 91 // The sample format of the PCM data. AudioStream::SampleFormat doesn't | |
| 92 // support U8. | |
| 93 enum { | |
| 94 FORMAT_U8, | |
| 95 FORMAT_S16 | |
| 96 } mSampleFormat; | |
| 97 | |
| 98 // Size of PCM data stored in the WAVE as reported by the data chunk in | |
| 99 // the media. | |
| 100 int64_t mWaveLength; | |
| 101 | |
| 102 // Start offset of the PCM data in the media stream. Extends mWaveLength | |
| 103 // bytes. | |
| 104 int64_t mWavePCMOffset; | |
| 105 }; | |
| 106 | |
| 107 } // namespace mozilla | |
| 108 | |
| 109 #endif |
