// Copyright (c) 2011 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Note: ported from Chromium commit head: 39a7f93
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#ifndef MEDIA_BASE_BITSTREAM_BUFFER_H_
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#define MEDIA_BASE_BITSTREAM_BUFFER_H_
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#include <stddef.h>
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#include <stdint.h>
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#include "base/macros.h"
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#include "base/memory/shared_memory.h"
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#include "base/time/time.h"
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namespace media {
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// Indicates an invalid or missing timestamp.
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constexpr base::TimeDelta kNoTimestamp =
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base::TimeDelta::FromMicroseconds(std::numeric_limits<int64_t>::min());
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// Class for passing bitstream buffers around. Does not take ownership of the
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// data. This is the media-namespace equivalent of PP_VideoBitstreamBuffer_Dev.
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class BitstreamBuffer {
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public:
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BitstreamBuffer();
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// Constructs a new BitstreamBuffer. The content of the bitstream is located
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// at |offset| bytes away from the start of the shared memory and the payload
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// is |size| bytes. When not provided, the default value for |offset| is 0.
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// |presentation_timestamp| is when the decoded frame should be displayed.
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// When not provided, |presentation_timestamp| will be
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// |media::kNoTimestamp|.
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BitstreamBuffer(int32_t id,
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base::SharedMemoryHandle handle,
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size_t size,
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off_t offset = 0,
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base::TimeDelta presentation_timestamp = kNoTimestamp);
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BitstreamBuffer(const BitstreamBuffer& other);
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~BitstreamBuffer();
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int32_t id() const { return id_; }
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base::SharedMemoryHandle handle() const { return handle_; }
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// The number of bytes of the actual bitstream data. It is the size of the
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// content instead of the whole shared memory.
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size_t size() const { return size_; }
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// The offset to the start of actual bitstream data in the shared memory.
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off_t offset() const { return offset_; }
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// The timestamp is only valid if it's not equal to |media::kNoTimestamp|.
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base::TimeDelta presentation_timestamp() const {
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return presentation_timestamp_;
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}
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void set_handle(const base::SharedMemoryHandle& handle) { handle_ = handle; }
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private:
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int32_t id_;
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base::SharedMemoryHandle handle_;
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size_t size_;
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off_t offset_;
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// This is only set when necessary. For example, AndroidVideoDecodeAccelerator
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// needs the timestamp because the underlying decoder may require it to
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// determine the output order.
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base::TimeDelta presentation_timestamp_;
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// Allow compiler-generated copy & assign constructors.
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};
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} // namespace media
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#endif // MEDIA_BASE_BITSTREAM_BUFFER_H_
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