ppapi/shared_impl/media_stream_buffer.h

   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
  11 namespace ppapi {
  12
  13 union 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_