ppapi: implement PPB_AudioEncoder

content/renderer/pepper/pepper_audio_encoder_host.h

+// Copyright 2015 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.
+
+#ifndef CONTENT_RENDERER_PEPPER_PEPPER_AUDIO_ENCODER_HOST_H_
+#define CONTENT_RENDERER_PEPPER_PEPPER_AUDIO_ENCODER_HOST_H_
+
+#include <deque>
+
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/scoped_vector.h"
+#include "content/common/content_export.h"
+#include "content/renderer/pepper/audio_encoder_shim.h"
+#include "ppapi/c/pp_codecs.h"
+#include "ppapi/host/host_message_context.h"
+#include "ppapi/host/resource_host.h"
+#include "ppapi/proxy/resource_message_params.h"
+#include "ppapi/proxy/serialized_structs.h"
+#include "ppapi/shared_impl/media_stream_buffer_manager.h"
+
+namespace content {
+
+class RendererPpapiHost;
+
+class CONTENT_EXPORT PepperAudioEncoderHost : public ppapi::host::ResourceHost {
+ public:
+  PepperAudioEncoderHost(RendererPpapiHost* host,
+                         PP_Instance instance,
+                         PP_Resource resource);
+  ~PepperAudioEncoderHost() override;
+
+ private:
+  class AudioData;
+  class BufferManager;
+  class BitstreamBufferManager;
+  class PcmBufferManager;
+
+  // ResourceHost implementation.
+  int32_t OnResourceMessageReceived(
+      const IPC::Message& msg,
+      ppapi::host::HostMessageContext* context) override;
+
+  int32_t OnHostMsgGetSupportedProfiles(
+      ppapi::host::HostMessageContext* context);
+  int32_t OnHostMsgInitialize(
+      ppapi::host::HostMessageContext* context,
+      const ppapi::proxy::PPB_AudioEncodeParameters& parameters);
+  int32_t OnHostMsgGetAudioFrames(ppapi::host::HostMessageContext* context);
+  int32_t OnHostMsgEncode(ppapi::host::HostMessageContext* context,
+                          uint32_t buffer_id);
+  int32_t OnHostMsgRecycleBitstreamBuffer(
+      ppapi::host::HostMessageContext* context,
+      uint32_t buffer_id);
+  int32_t OnHostMsgRequestBitrateChange(
+      ppapi::host::HostMessageContext* context,
+      uint32_t bitrate);
+  int32_t OnHostMsgClose(ppapi::host::HostMessageContext* context);
+
+  void GetSupportedProfiles(std::vector<PP_AudioProfileDescription>* profiles);
+  bool IsInitializationValid(
+      const ppapi::proxy::PPB_AudioEncodeParameters& parameters);
+  bool AllocateAudioFrames(uint32_t number_of_samples);
+  bool AllocateBitstreamBuffers(size_t buffer_size);
+  scoped_refptr<AudioEncoderShim::AudioData> GetAudioData(
+      const scoped_refptr<BufferManager>& buffer_manager);
+  void DoEncode();
+  void BitstreamBufferReady(
+      int32_t audio_buffer_id,
+      const scoped_refptr<AudioEncoderShim::AudioData>& output,
+      int32_t size);
+  void NotifyPepperError(int32_t error);
+  void Close();
+
+  // Non-owning pointer.
+  RendererPpapiHost* renderer_ppapi_host_;
+
+  scoped_ptr<AudioEncoderShim> encoder_;
+
+  // Whether the encoder has been successfully initialized.
+  bool initialized_;
+
+  // Last error reported by the encoder.

[Tom Sepez, 2015/09/17 18:11:13]

nit: as defined where? Is there an enum type representing the error codes or a
bunch of #defines in some header, for example?

[llandwerlin-old, 2015/10/05 16:11:00]

It's a pepper error code, added a comment.

+  int32_t encoder_last_error_;
+
+  // Encoder's parameters, only valid if |initialized_| is true.
+  ppapi::proxy::PPB_AudioEncodeParameters encode_parameters_;
+
+  // Queue of pending audio buffer ids to be encoded.
+  std::deque<int32_t> pending_encode_buffers_;

[Tom Sepez, 2015/09/17 18:11:13]

nit: is there a reason IDs are signed?

[llandwerlin-old, 2015/10/05 16:11:00]

Done.

+
+  // Buffer manager for the audio buffers handed by the plugin.
+  scoped_refptr<BufferManager> audio_buffer_manager_;
+
+  // Buffer manager for bitstream buffers handed to the plugin.
+  scoped_refptr<BufferManager> bitstream_buffer_manager_;
+
+  // Saved context to answer an Initialize message from the plugin.
+  ppapi::host::ReplyMessageContext initialize_reply_context_;
+
+  // Saved context to answer a GetAudioFrames message from the plugin.
+  ppapi::host::ReplyMessageContext get_audio_frames_reply_context_;
+
+  base::WeakPtrFactory<PepperAudioEncoderHost> weak_ptr_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(PepperAudioEncoderHost);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_PEPPER_PEPPER_AUDIO_ENCODER_HOST_H_