gecko/content/media/omx/RtspOmxReader.h

91 lines
3.2 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#if !defined(RtspOmxReader_h_)
#define RtspOmxReader_h_
#include "MediaResource.h"
#include "MediaDecoderReader.h"
#include "MediaOmxReader.h"
namespace mozilla {
namespace dom {
class TimeRanges;
}
class AbstractMediaDecoder;
class RtspMediaResource;
/* RtspOmxReader is a subclass of MediaOmxReader.
* The major reason that RtspOmxReader inherit from MediaOmxReader is the
* same video/audio decoding logic we can reuse.
*/
class RtspOmxReader : public MediaOmxReader
{
protected:
// Provide a Rtsp extractor.
nsresult InitOmxDecoder() MOZ_FINAL MOZ_OVERRIDE;
public:
RtspOmxReader(AbstractMediaDecoder* aDecoder)
: MediaOmxReader(aDecoder) {
MOZ_COUNT_CTOR(RtspOmxReader);
NS_ASSERTION(mDecoder, "RtspOmxReader mDecoder is null.");
NS_ASSERTION(mDecoder->GetResource(),
"RtspOmxReader mDecoder->GetResource() is null.");
mRtspResource = mDecoder->GetResource()->GetRtspPointer();
MOZ_ASSERT(mRtspResource);
}
virtual ~RtspOmxReader() MOZ_OVERRIDE {
MOZ_COUNT_DTOR(RtspOmxReader);
}
virtual nsresult ReadMetadata(MediaInfo* aInfo,
MetadataTags** aTags) MOZ_OVERRIDE;
// Implement a time-based seek instead of byte-based..
virtual nsresult Seek(int64_t aTime, int64_t aStartTime, int64_t aEndTime,
int64_t aCurrentTime) MOZ_FINAL MOZ_OVERRIDE;
// Override GetBuffered() to do nothing for below reasons:
// 1. Because the Rtsp stream is a/v separated. The buffered data in a/v
// tracks are not consistent with time stamp.
// For example: audio buffer: 1~2s, video buffer: 1.5~2.5s
// 2. Since the Rtsp is a realtime streaming, the buffer we made for
// RtspMediaResource is quite small. The small buffer implies the time ranges
// we returned are not useful for the MediaDecodeStateMachine. Unlike the
// ChannelMediaResource, it has a "cache" that can store the whole streaming
// data so the |GetBuffered| function can retrieve useful time ranges.
virtual nsresult GetBuffered(mozilla::dom::TimeRanges* aBuffered,
int64_t aStartTime) MOZ_FINAL MOZ_OVERRIDE {
return NS_OK;
}
// Override FindStartTime() to return null pointer.
// For Rtsp, we don't have the first video frame in DECODING_METADATA state.
// It will be available until player request Play() and media decoder enters
// DECODING state.
virtual VideoData* FindStartTime(int64_t& aOutStartTime)
MOZ_FINAL MOZ_OVERRIDE {
return nullptr;
}
virtual void SetIdle() MOZ_OVERRIDE;
virtual void SetActive() MOZ_OVERRIDE;
private:
// A pointer to RtspMediaResource for calling the Rtsp specific function.
// The lifetime of mRtspResource is controlled by MediaDecoder. MediaDecoder
// holds the MediaDecoderStateMachine and RtspMediaResource.
// And MediaDecoderStateMachine holds this RtspOmxReader.
RtspMediaResource* mRtspResource;
};
} // namespace mozilla
#endif