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78 lines
2.5 KiB
C++
78 lines
2.5 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:set ts=2 sw=2 sts=2 et cindent: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#if !defined(WMFAudioDecoder_h_)
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#define WMFAudioDecoder_h_
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#include "WMF.h"
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#include "MP4Reader.h"
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#include "MFTDecoder.h"
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namespace mozilla {
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class WMFAudioDecoder : public MediaDataDecoder {
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public:
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WMFAudioDecoder();
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nsresult Init(uint32_t aChannelCount,
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uint32_t aSampleRate,
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uint16_t aBitsPerSample,
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const uint8_t* aUserData,
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uint32_t aUserDataLength);
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virtual nsresult Shutdown() MOZ_OVERRIDE;
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// Inserts data into the decoder's pipeline.
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virtual DecoderStatus Input(const uint8_t* aData,
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uint32_t aLength,
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Microseconds aDTS,
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Microseconds aPTS,
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int64_t aOffsetInStream);
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// Blocks until a decoded sample is produced by the decoder.
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virtual DecoderStatus Output(nsAutoPtr<MediaData>& aOutData);
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virtual DecoderStatus Flush() MOZ_OVERRIDE;
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private:
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// A helper for Output() above. This has the same interface as Output()
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// above, except that it returns DECODE_STATUS_OK and sets aOutData to
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// nullptr when all the output samples have been stripped due to having
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// negative timestamps. WMF's AAC decoder sometimes output negatively
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// timestamped samples, presumably they're the preroll samples, and we
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// strip them.
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DecoderStatus OutputNonNegativeTimeSamples(nsAutoPtr<MediaData>& aOutData);
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nsAutoPtr<MFTDecoder> mDecoder;
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uint32_t mAudioChannels;
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uint32_t mAudioBytesPerSample;
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uint32_t mAudioRate;
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// The last offset into the media resource that was passed into Input().
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// This is used to approximate the decoder's position in the media resource.
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int64_t mLastStreamOffset;
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// The offset, in audio frames, at which playback started since the
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// last discontinuity.
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int64_t mAudioFrameOffset;
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// The number of audio frames that we've played since the last
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// discontinuity.
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int64_t mAudioFrameSum;
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// True if we need to re-initialize mAudioFrameOffset and mAudioFrameSum
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// from the next audio packet we decode. This happens after a seek, since
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// WMF doesn't mark a stream as having a discontinuity after a seek(0).
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bool mMustRecaptureAudioPosition;
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};
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} // namespace mozilla
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#endif
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