Add media::VideoEncodeAccelerator with WebRTC integration

content/common/gpu/gpu_messages.h

Index: content/common/gpu/gpu_messages.h
diff --git a/content/common/gpu/gpu_messages.h b/content/common/gpu/gpu_messages.h
index 5749c371c1b7cfe1c492ffbe3f1548e65f395903..cf6169611e2f84c0426c13c0e96648036e862a61 100644
--- a/content/common/gpu/gpu_messages.h
+++ b/content/common/gpu/gpu_messages.h
@@ -23,7 +23,9 @@
 #include "gpu/ipc/gpu_command_buffer_traits.h"
 #include "ipc/ipc_channel_handle.h"
 #include "ipc/ipc_message_macros.h"
+#include "media/base/video_frame.h"
 #include "media/video/video_decode_accelerator.h"
+#include "media/video/video_encode_accelerator.h"
 #include "ui/base/latency_info.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/gfx/size.h"
@@ -217,6 +219,10 @@ IPC_STRUCT_TRAITS_BEGIN(content::GpuRenderingStats)
   IPC_STRUCT_TRAITS_MEMBER(total_processing_commands_time)
 IPC_STRUCT_TRAITS_END()
 
+IPC_ENUM_TRAITS(media::VideoFrame::Format)
+
+IPC_ENUM_TRAITS(media::VideoEncodeAccelerator::Error)
+
 //------------------------------------------------------------------------------
 // GPU Messages
 // These are messages from the browser to the GPU process.
@@ -447,6 +453,12 @@ IPC_MESSAGE_CONTROL1(GpuChannelMsg_GenerateMailboxNamesAsync,
 IPC_MESSAGE_CONTROL1(GpuChannelMsg_GenerateMailboxNamesReply,
                      std::vector<gpu::Mailbox> /* mailbox_names */)
 
+// Create a new GPU-accelerated video encoder.
+IPC_SYNC_MESSAGE_CONTROL0_1(GpuChannelMsg_CreateVideoEncoder,
+                            int32 /* route_id */)
+
+IPC_MESSAGE_CONTROL1(GpuChannelMsg_DestroyVideoEncoder, int32 /* route_id */)
+
 #if defined(OS_ANDROID)
 // Register the StreamTextureProxy class with the GPU process, so that
 // the renderer process will get notified whenever a frame becomes available.
@@ -690,3 +702,63 @@ IPC_MESSAGE_ROUTED0(AcceleratedVideoDecoderHostMsg_ResetDone)
 // Video decoder has encountered an error.
 IPC_MESSAGE_ROUTED1(AcceleratedVideoDecoderHostMsg_ErrorNotification,
                     uint32) /* Error ID */
+
+//------------------------------------------------------------------------------
+// Accelerated Video Encoder Messages
+// These messages are sent from the Renderer process to GPU process.
+
+// Initialize the accelerated encoder.
+IPC_MESSAGE_ROUTED4(AcceleratedVideoEncoderMsg_Initialize,
+                    media::VideoFrame::Format /* input_format */,
+                    gfx::Size /* input_visible_size */,
+                    media::VideoCodecProfile /* output_profile */,
+                    int32 /* initial_bitrate */)
+
+// Queue a input buffer to the encoder to encode. |frame_id| will be returned by
+// AcceleratedVideoEncoderHostMsg_NotifyEncodeDone.
+IPC_MESSAGE_ROUTED4(AcceleratedVideoEncoderMsg_Encode,
+                    int32 /* frame_id */,
+                    base::SharedMemoryHandle /* buffer_handle */,
+                    uint32 /* buffer_size */,
+                    bool /* force_keyframe */)
+
+// Queue a buffer to the encoder for use in returning output.  |buffer_id| will
+// be returned by AcceleratedVideoEncoderHostMsg_BitstreamBufferReady.
+IPC_MESSAGE_ROUTED3(AcceleratedVideoEncoderMsg_UseOutputBitstreamBuffer,
+                    int32 /* buffer_id */,
+                    base::SharedMemoryHandle /* buffer_handle */,
+                    uint32 /* buffer_size */)
+
+// Request a runtime encoding parameter change.
+IPC_MESSAGE_ROUTED1(AcceleratedVideoEncoderMsg_RequestEncodingParameterChange,
+                    int32 /* bitrate */)
+
+//------------------------------------------------------------------------------
+// Accelerated Video Encoder Host Messages
+// These messages are sent from GPU process to Renderer process.
+
+// Notify of the completion of initialization.
+IPC_MESSAGE_ROUTED0(AcceleratedVideoEncoderHostMsg_NotifyInitializeDone)
+
+// Notify renderer of the input/output buffer requirements of the encoder.
+IPC_MESSAGE_ROUTED3(AcceleratedVideoEncoderHostMsg_RequireBitstreamBuffers,
+                    int /* input_count */,
+                    gfx::Size /* input_coded_size */,
+                    uint32 /* output_buffer_size */)
+
+// Notify the renderer that encoding has been completed on an input buffer.

[Ami GONE FROM CHROMIUM, 2013/08/06 20:41:13]

really?  I thought this notification was that the frame has been queued for
encoding, not that encoding was done (as visible by BitstreamBufferReady).

[sheu, 2013/08/07 09:25:03]

Reworded and renamed.  This comment is a little obtuse.

+// There is not congruent entry point in the media::VideoEncodeAccelerator

[Ami GONE FROM CHROMIUM, 2013/08/06 20:41:13]

s/congruent/congruent to/

[sheu, 2013/08/07 09:25:03]

Changed, but not that way.

+// interface, as the duration of encoding is implicit in the lifespan of the
+// media::VideoFrame passed to VEA::Encode().
+IPC_MESSAGE_ROUTED1(AcceleratedVideoEncoderHostMsg_NotifyEncodeDone,
+                    int32 /* frame_id */)
+
+// Notify the renderer that an output buffer has been filled with encoded data.
+IPC_MESSAGE_ROUTED3(AcceleratedVideoEncoderHostMsg_BitstreamBufferReady,
+                    int32 /* bitstream_buffer_id */,
+                    uint32 /* payload_size */,
+                    bool /* key_frame */)
+
+// Report error condition.
+IPC_MESSAGE_ROUTED1(AcceleratedVideoEncoderHostMsg_NotifyError,
+                    media::VideoEncodeAccelerator::Error /* error */)