1// Copyright 2014 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef PPAPI_SHARED_IMPL_MEDIA_STREAM_BUFFER_H_
6#define PPAPI_SHARED_IMPL_MEDIA_STREAM_BUFFER_H_
7
8#include "ppapi/c/ppb_audio_buffer.h"
9#include "ppapi/c/ppb_video_frame.h"
10
11namespace ppapi {
12
13union MediaStreamBuffer {
14  enum Type { TYPE_UNKNOWN = 0, TYPE_AUDIO = 1, TYPE_VIDEO = 2, };
15
16  struct Header {
17    Type type;
18    uint32_t size;
19  };
20
21  struct Audio {
22    Header header;
23    PP_TimeDelta timestamp;
24    PP_AudioBuffer_SampleRate sample_rate;
25    uint32_t number_of_channels;
26    uint32_t number_of_samples;
27    uint32_t data_size;
28    // Uses 8 bytes to make sure the Audio struct has consistent size between
29    // NaCl code and renderer code.
30    uint8_t data[8];
31  };
32
33  struct Video {
34    Header header;
35    PP_TimeDelta timestamp;
36    PP_VideoFrame_Format format;
37    PP_Size size;
38    uint32_t data_size;
39    // Uses 8 bytes to make sure the Video struct has consistent size between
40    // NaCl code and renderer code.
41    uint8_t data[8];
42  };
43
44  // Because these structs are written and read in shared memory, we need
45  // the size and alighment to be consistent between NaCl and its host trusted
46  // platform.
47  PP_COMPILE_ASSERT_SIZE_IN_BYTES(Header, 8);
48  PP_COMPILE_ASSERT_SIZE_IN_BYTES(Audio, 40);
49  PP_COMPILE_ASSERT_SIZE_IN_BYTES(Video, 40);
50
51  Header header;
52  Video video;
53  Audio audio;
54};
55
56}  // namespace ppapi
57
58#endif  // PPAPI_SHARED_IMPL_MEDIA_STREAM_BUFFER_H_
59