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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <stddef.h>
#include <stdint.h>
#include "base/macros.h"
#include "base/memory/shared_memory.h"
#include "base/time/time.h"
#include "media/base/decrypt_config.h"
#include "media/base/media_export.h"
#include "media/base/timestamp_constants.h"
namespace IPC {
template <class P>
struct ParamTraits;
namespace media {
// Class for passing bitstream buffers around. Does not take ownership of the
// data. This is the media-namespace equivalent of PP_VideoBitstreamBuffer_Dev.
class MEDIA_EXPORT BitstreamBuffer {
// Constructs a new BitstreamBuffer. The content of the bitstream is located
// at |offset| bytes away from the start of the shared memory and the payload
// is |size| bytes. When not provided, the default value for |offset| is 0.
// |presentation_timestamp| is when the decoded frame should be displayed.
// When not provided, |presentation_timestamp| will be
// |media::kNoTimestamp|.
BitstreamBuffer(int32_t id,
base::SharedMemoryHandle handle,
size_t size,
off_t offset = 0,
base::TimeDelta presentation_timestamp = kNoTimestamp);
BitstreamBuffer(const BitstreamBuffer& other);
void SetDecryptConfig(const DecryptConfig& decrypt_config);
int32_t id() const { return id_; }
base::SharedMemoryHandle handle() const { return handle_; }
// The number of bytes of the actual bitstream data. It is the size of the
// content instead of the whole shared memory.
size_t size() const { return size_; }
// The offset to the start of actual bitstream data in the shared memory.
off_t offset() const { return offset_; }
// The timestamp is only valid if it's not equal to |media::kNoTimestamp|.
base::TimeDelta presentation_timestamp() const {
return presentation_timestamp_;
void set_handle(const base::SharedMemoryHandle& handle) { handle_ = handle; }
// The following methods come from DecryptConfig.
const std::string& key_id() const { return key_id_; }
const std::string& iv() const { return iv_; }
const std::vector<SubsampleEntry>& subsamples() const { return subsamples_; }
int32_t id_;
base::SharedMemoryHandle handle_;
size_t size_;
off_t offset_;
// This is only set when necessary. For example, AndroidVideoDecodeAccelerator
// needs the timestamp because the underlying decoder may require it to
// determine the output order.
base::TimeDelta presentation_timestamp_;
// The following fields come from DecryptConfig.
// TODO(timav): Try to DISALLOW_COPY_AND_ASSIGN and include these params as
// std::unique_ptr<DecryptConfig> or explain why copy & assign is needed.
std::string key_id_; // key ID.
std::string iv_; // initialization vector
std::vector<SubsampleEntry> subsamples_; // clear/cypher sizes
friend struct IPC::ParamTraits<media::BitstreamBuffer>;
// Allow compiler-generated copy & assign constructors.
} // namespace media