ppapi: implement PPB_AudioEncoder

content/renderer/pepper/pepper_audio_encoder_host.cc

+// 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.
+
+#include "base/bind.h"
+#include "base/memory/shared_memory.h"
+#include "base/numerics/safe_math.h"
+#include "content/public/renderer/renderer_ppapi_host.h"
+#include "content/renderer/pepper/audio_encoder_shim.h"
+#include "content/renderer/pepper/host_globals.h"
+#include "content/renderer/pepper/pepper_audio_encoder_host.h"
+#include "content/renderer/render_thread_impl.h"
+#include "media/base/bind_to_current_loop.h"
+#include "ppapi/c/pp_codecs.h"
+#include "ppapi/c/pp_errors.h"
+#include "ppapi/host/dispatch_host_message.h"
+#include "ppapi/host/ppapi_host.h"
+#include "ppapi/proxy/ppapi_messages.h"
+#include "ppapi/shared_impl/media_stream_buffer.h"
+
+using ppapi::proxy::SerializedHandle;
+
+namespace content {
+
+namespace {
+
+// Number of input audio buffers (150ms at 10ms per frame).
+const uint32_t kDefaultNumberOfAudioBuffers = 15;
+
+// Number of bitstream buffers.
+const uint32_t kDefaultNumberOfBitstreamBuffers = 8;
+
+// Default bitstream buffers size.
+// TODO(llandwerlin): Would having this a multiple of the audio frame
+// size would make more sense?
+const size_t kDefaultBitstreamBufferSize = 100000;
+
+bool PP_HardwareAccelerationCompatible(bool accelerated,
+                                       PP_HardwareAcceleration requested) {
+  switch (requested) {
+    case PP_HARDWAREACCELERATION_ONLY:
+      return accelerated;
+    case PP_HARDWAREACCELERATION_NONE:
+      return !accelerated;
+    case PP_HARDWAREACCELERATION_WITHFALLBACK:
+      return true;
+      // No default case, to catch unhandled PP_HardwareAcceleration values.
+  }
+  return false;
+}
+
+}  // namespace
+
+PepperAudioEncoderHost::PepperAudioEncoderHost(RendererPpapiHost* host,
+                                               PP_Instance instance,
+                                               PP_Resource resource)
+    : ResourceHost(host->GetPpapiHost(), instance, resource),
+      renderer_ppapi_host_(host),
+      initialized_(false),
+      encoder_last_error_(PP_ERROR_FAILED),
+      audio_buffer_manager_(this),
+      bitstream_buffer_manager_(this),
+      weak_ptr_factory_(this) {}
+
+PepperAudioEncoderHost::~PepperAudioEncoderHost() {
+  Close();
+}
+
+int32_t PepperAudioEncoderHost::OnResourceMessageReceived(
+    const IPC::Message& msg,
+    ppapi::host::HostMessageContext* context) {
+  PPAPI_BEGIN_MESSAGE_MAP(PepperAudioEncoderHost, msg)
+    PPAPI_DISPATCH_HOST_RESOURCE_CALL_0(
+        PpapiHostMsg_AudioEncoder_GetSupportedProfiles,
+        OnHostMsgGetSupportedProfiles)
+    PPAPI_DISPATCH_HOST_RESOURCE_CALL(PpapiHostMsg_AudioEncoder_Initialize,
+                                      OnHostMsgInitialize)
+    PPAPI_DISPATCH_HOST_RESOURCE_CALL_0(
+        PpapiHostMsg_AudioEncoder_GetAudioBuffers, OnHostMsgGetAudioBuffers)
+    PPAPI_DISPATCH_HOST_RESOURCE_CALL(PpapiHostMsg_AudioEncoder_Encode,
+                                      OnHostMsgEncode)
+    PPAPI_DISPATCH_HOST_RESOURCE_CALL(
+        PpapiHostMsg_AudioEncoder_RecycleBitstreamBuffer,
+        OnHostMsgRecycleBitstreamBuffer)
+    PPAPI_DISPATCH_HOST_RESOURCE_CALL(
+        PpapiHostMsg_AudioEncoder_RequestBitrateChange,
+        OnHostMsgRequestBitrateChange)
+    PPAPI_DISPATCH_HOST_RESOURCE_CALL_0(PpapiHostMsg_AudioEncoder_Close,
+                                        OnHostMsgClose)
+  PPAPI_END_MESSAGE_MAP()
+  return PP_ERROR_FAILED;
+}
+
+int32_t PepperAudioEncoderHost::OnHostMsgGetSupportedProfiles(
+    ppapi::host::HostMessageContext* context) {
+  std::vector<PP_AudioProfileDescription> profiles;
+  GetSupportedProfiles(&profiles);
+
+  host()->SendReply(
+      context->MakeReplyMessageContext(),
+      PpapiPluginMsg_AudioEncoder_GetSupportedProfilesReply(profiles));
+
+  return PP_OK_COMPLETIONPENDING;
+}
+
+int32_t PepperAudioEncoderHost::OnHostMsgInitialize(
+    ppapi::host::HostMessageContext* context,
+    const ppapi::proxy::PPB_AudioEncodeParameters& parameters) {
+  if (initialized_)
+    return PP_ERROR_FAILED;
+
+  if (!IsInitializationValid(parameters))
+    return PP_ERROR_NOTSUPPORTED;
+
+  encode_parameters_ = parameters;
+
+  int32_t error = PP_ERROR_FAILED;
+  if (parameters.acceleration == PP_HARDWAREACCELERATION_NONE ||
+      parameters.acceleration == PP_HARDWAREACCELERATION_WITHFALLBACK) {
+    encoder_.reset(new AudioEncoderShim);
+    if (encoder_->Initialize(parameters)) {
+      if (AllocateBitstreamBuffers(kDefaultBitstreamBufferSize)) {
+        initialized_ = true;
+        encoder_last_error_ = PP_OK;
+
+        ppapi::host::ReplyMessageContext reply_context =
+            context->MakeReplyMessageContext();
+        reply_context.params.AppendHandle(SerializedHandle(
+            renderer_ppapi_host_->ShareSharedMemoryHandleWithRemote(
+                bitstream_buffer_manager_.shm()->handle()),
+            bitstream_buffer_manager_.shm()->mapped_size()));
+        host()->SendReply(reply_context,
+                          PpapiPluginMsg_AudioEncoder_InitializeReply(
+                              encoder_->GetNumberOfSamplesPerFrame(),
+                              bitstream_buffer_manager_.number_of_buffers(),
+                              bitstream_buffer_manager_.buffer_size()));
+
+        return PP_OK_COMPLETIONPENDING;
+      }
+      error = PP_ERROR_NOMEMORY;
+    } else
+      error = PP_ERROR_FAILED;
+  }
+
+  encoder_ = nullptr;
+
+  return error;
+}
+
+int32_t PepperAudioEncoderHost::OnHostMsgGetAudioBuffers(
+    ppapi::host::HostMessageContext* context) {
+  if (encoder_last_error_)
+    return encoder_last_error_;
+
+  if (!AllocateAudioBuffers(encoder_->GetNumberOfSamplesPerFrame()))
+    return PP_ERROR_NOMEMORY;
+
+  ppapi::host::ReplyMessageContext reply_context =
+      context->MakeReplyMessageContext();
+  reply_context.params.AppendHandle(
+      SerializedHandle(renderer_ppapi_host_->ShareSharedMemoryHandleWithRemote(
+                           audio_buffer_manager_.shm()->handle()),
+                       audio_buffer_manager_.shm()->mapped_size()));
+
+  host()->SendReply(reply_context,
+                    PpapiPluginMsg_AudioEncoder_GetAudioBuffersReply(
+                        audio_buffer_manager_.number_of_buffers(),
+                        audio_buffer_manager_.buffer_size()));
+
+  return PP_OK_COMPLETIONPENDING;
+}
+
+int32_t PepperAudioEncoderHost::OnHostMsgEncode(
+    ppapi::host::HostMessageContext* context,
+    uint32_t buffer_id) {
+  if (encoder_last_error_)
+    return encoder_last_error_;
+
+  if (buffer_id >=
+      static_cast<uint32_t>(audio_buffer_manager_.number_of_buffers()))
+    return PP_ERROR_BADARGUMENT;
+
+  audio_buffer_manager_.EnqueueBuffer(buffer_id);
+
+  DoEncode();
+
+  return PP_OK_COMPLETIONPENDING;
+}
+
+int32_t PepperAudioEncoderHost::OnHostMsgRecycleBitstreamBuffer(
+    ppapi::host::HostMessageContext* context,
+    uint32_t buffer_id) {
+  if (encoder_last_error_)
+    return encoder_last_error_;
+
+  if (buffer_id >=
+      static_cast<uint32_t>(bitstream_buffer_manager_.number_of_buffers()))
+    return PP_ERROR_BADARGUMENT;
+
+  bitstream_buffer_manager_.EnqueueBuffer(buffer_id);
+
+  DoEncode();
+
+  return PP_OK;
+}
+
+int32_t PepperAudioEncoderHost::OnHostMsgRequestBitrateChange(
+    ppapi::host::HostMessageContext* context,
+    uint32_t bitrate) {
+  if (encoder_last_error_)
+    return encoder_last_error_;
+
+  encoder_->RequestBitrateChange(bitrate);
+
+  return PP_OK;
+}
+
+int32_t PepperAudioEncoderHost::OnHostMsgClose(
+    ppapi::host::HostMessageContext* context) {
+  encoder_last_error_ = PP_ERROR_FAILED;
+  Close();
+
+  return PP_OK;
+}
+
+void PepperAudioEncoderHost::GetSupportedProfiles(
+    std::vector<PP_AudioProfileDescription>* profiles) {
+  DCHECK(RenderThreadImpl::current());
+
+  AudioEncoderShim software_encoder;
+  *profiles = software_encoder.GetSupportedProfiles();
+}
+
+bool PepperAudioEncoderHost::IsInitializationValid(
+    const ppapi::proxy::PPB_AudioEncodeParameters& parameters) {
+  DCHECK(RenderThreadImpl::current());
+
+  std::vector<PP_AudioProfileDescription> profiles;
+  GetSupportedProfiles(&profiles);
+
+  for (const PP_AudioProfileDescription& profile : profiles) {
+    if (parameters.output_profile == profile.profile &&
+        parameters.input_sample_size == profile.sample_size &&
+        parameters.input_sample_rate == profile.sample_rate &&
+        parameters.channels <= profile.max_channels &&
+        PP_HardwareAccelerationCompatible(
+            profile.hardware_accelerated == PP_TRUE ? true : false,
+            parameters.acceleration))
+      return true;
+  }
+
+  return false;
+}
+
+bool PepperAudioEncoderHost::AllocateAudioBuffers(uint32_t number_of_samples) {
+  DCHECK(RenderThreadImpl::current());
+  DCHECK(initialized_);
+
+  // Buffers have already been allocated.
+  if (audio_buffer_manager_.number_of_buffers() > 0)
+    return false;
+
+  base::CheckedNumeric<size_t> buffer_size = number_of_samples;
+  buffer_size *= encode_parameters_.channels;
+  buffer_size *= encode_parameters_.input_sample_size;
+  if (!buffer_size.IsValid())
+    return false;
+
+  base::CheckedNumeric<size_t> total_buffer_size = buffer_size.ValueOrDie();
+  total_buffer_size += sizeof(ppapi::MediaStreamBuffer::Audio);
+  if (!total_buffer_size.IsValid())
+    return false;
+
+  base::CheckedNumeric<size_t> total_memory_size =
+      total_buffer_size.ValueOrDie();
+  total_memory_size *= kDefaultNumberOfAudioBuffers;
+  if (!total_memory_size.IsValid())
+    return false;
+
+  if (!audio_buffer_manager_.SetBuffers(
+          kDefaultNumberOfAudioBuffers, total_buffer_size.ValueOrDie(),
+          RenderThreadImpl::current()
+              ->HostAllocateSharedMemoryBuffer(total_memory_size.ValueOrDie())
+              .Pass(),
+          false))
+    return false;
+
+  for (int32_t i = 0; i < audio_buffer_manager_.number_of_buffers(); ++i) {
+    ppapi::MediaStreamBuffer::Audio* buffer =
+        &(audio_buffer_manager_.GetBufferPointer(i)->audio);
+    buffer->header.size = total_buffer_size.ValueOrDie();
+    buffer->header.type = ppapi::MediaStreamBuffer::TYPE_AUDIO;
+    buffer->sample_rate = static_cast<PP_AudioBuffer_SampleRate>(
+        encode_parameters_.input_sample_rate);
+    buffer->number_of_channels = encode_parameters_.channels;
+    buffer->number_of_samples = number_of_samples;
+    buffer->data_size = buffer_size.ValueOrDie();
+  }
+
+  return true;
+}
+
+bool PepperAudioEncoderHost::AllocateBitstreamBuffers(size_t buffer_size) {
+  DCHECK(RenderThreadImpl::current());
+  // We assume RequireBitstreamBuffers is only called once.
+  DCHECK(!initialized_);
+
+  // Buffers have already been allocated.
+  if (bitstream_buffer_manager_.number_of_buffers() > 0)
+    return false;
+
+  base::CheckedNumeric<size_t> total_size = buffer_size;
+  total_size *= kDefaultNumberOfBitstreamBuffers;
+  if (!total_size.IsValid())
+    return false;
+
+  if (!bitstream_buffer_manager_.SetBuffers(
+          kDefaultNumberOfBitstreamBuffers, buffer_size,
+          RenderThreadImpl::current()
+              ->HostAllocateSharedMemoryBuffer(total_size.ValueOrDie())
+              .Pass(),
+          true))
+    return false;
+
+  return true;
+}
+
+AudioEncoderShim::AudioData PepperAudioEncoderHost::GetAudioData(
+    uint32_t* buffer_id) {
+  DCHECK(audio_buffer_manager_.HasAvailableBuffer());
+  int32_t id = audio_buffer_manager_.DequeueBuffer();
+  ppapi::MediaStreamBuffer* buffer = audio_buffer_manager_.GetBufferPointer(id);
+  *buffer_id = id;
+  return AudioEncoderShim::AudioData(static_cast<uint8_t*>(buffer->audio.data),
+                                     buffer->audio.data_size);
+}
+
+AudioEncoderShim::AudioData PepperAudioEncoderHost::GetBitstreamData(
+    uint32_t* buffer_id) {
+  DCHECK(bitstream_buffer_manager_.HasAvailableBuffer());
+  int32_t id = bitstream_buffer_manager_.DequeueBuffer();
+  uint8_t* buffer = reinterpret_cast<uint8_t*>(
+      bitstream_buffer_manager_.GetBufferPointer(id));
+  *buffer_id = id;
+  return AudioEncoderShim::AudioData(buffer,
+                                     bitstream_buffer_manager_.buffer_size());
+}
+
+void PepperAudioEncoderHost::DoEncode() {
+  if (!audio_buffer_manager_.HasAvailableBuffer() ||
+      !bitstream_buffer_manager_.HasAvailableBuffer())
+    return;
+
+  uint32_t audio_buffer_id, bitstream_buffer_id;
+  AudioEncoderShim::AudioData input(GetAudioData(&audio_buffer_id));
+  AudioEncoderShim::AudioData output(GetBitstreamData(&bitstream_buffer_id));
+  encoder_->Encode(input, output,
+                   base::Bind(&PepperAudioEncoderHost::BitstreamBufferReady,
+                              weak_ptr_factory_.GetWeakPtr(), audio_buffer_id,
+                              bitstream_buffer_id));
+}
+
+void PepperAudioEncoderHost::BitstreamBufferReady(
+    uint32_t audio_buffer_id,
+    uint32_t bitstream_buffer_id,
+    const AudioEncoderShim::AudioData& output,
+    int64_t size) {
+  DCHECK(RenderThreadImpl::current());
+
+  if (encoder_last_error_)
+    return;
+
+  host()->SendUnsolicitedReply(
+      pp_resource(), PpapiPluginMsg_AudioEncoder_EncodeReply(audio_buffer_id));
+
+  if (size < 0) {
+    NotifyPepperError(PP_ERROR_FAILED);
+    return;
+  }
+
+  host()->SendUnsolicitedReply(
+      pp_resource(), PpapiPluginMsg_AudioEncoder_BitstreamBufferReady(
+                         bitstream_buffer_id, static_cast<uint32_t>(size)));
+}
+
+void PepperAudioEncoderHost::NotifyPepperError(int32_t error) {
+  DCHECK(RenderThreadImpl::current());
+
+  encoder_last_error_ = error;
+  Close();
+  host()->SendUnsolicitedReply(
+      pp_resource(),
+      PpapiPluginMsg_AudioEncoder_NotifyError(encoder_last_error_));
+}
+
+void PepperAudioEncoderHost::Close() {
+  DCHECK(RenderThreadImpl::current());
+
+  encoder_ = nullptr;
+}
+
+}  // namespace content