Pepper: add video_encoder example

ppapi/examples/video_encode/video_encode.cc

Index: ppapi/examples/video_encode/video_encode.cc
diff --git a/ppapi/examples/video_encode/video_encode.cc b/ppapi/examples/video_encode/video_encode.cc
new file mode 100644
index 0000000000000000000000000000000000000000..26c66dff1fa34d7a8d30bf9619455843ffd17049
--- /dev/null
+++ b/ppapi/examples/video_encode/video_encode.cc
@@ -0,0 +1,502 @@
+// 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 <math.h>
+#include <stdio.h>
+#include <string.h>
+
+#include <iostream>
+#include <sstream>
+#include <vector>
+
+#include "ppapi/c/pp_errors.h"
+#include "ppapi/c/ppb_console.h"
+#include "ppapi/cpp/input_event.h"
+#include "ppapi/cpp/instance.h"
+#include "ppapi/cpp/media_stream_video_track.h"
+#include "ppapi/cpp/module.h"
+#include "ppapi/cpp/rect.h"
+#include "ppapi/cpp/var.h"
+#include "ppapi/cpp/var_array_buffer.h"
+#include "ppapi/cpp/var_dictionary.h"
+#include "ppapi/cpp/video_encoder.h"
+#include "ppapi/cpp/video_frame.h"
+#include "ppapi/utility/completion_callback_factory.h"
+
+// TODO(llandwerlin): turn on by default when we have software encode.
+// #define USE_VP8_INSTEAD_OF_H264
+
+// When compiling natively on Windows, PostMessage can be #define-d to
+// something else.
+#ifdef PostMessage
+#undef PostMessage
+#endif
+
+// Use assert as a poor-man's CHECK, even in non-debug mode.
+// Since <assert.h> redefines assert on every inclusion (it doesn't use
+// include-guards), make sure this is the last file #include'd in this file.
+#undef NDEBUG
+#include <assert.h>
+
+namespace {
+
+std::string VideoProfileToString(PP_VideoProfile profile) {
+  switch (profile) {
+    case PP_VIDEOPROFILE_H264BASELINE:
+      return "h264baseline";
+    case PP_VIDEOPROFILE_H264MAIN:
+      return "h264main";
+    case PP_VIDEOPROFILE_H264EXTENDED:
+      return "h264extended";
+    case PP_VIDEOPROFILE_H264HIGH:
+      return "h264high";
+    case PP_VIDEOPROFILE_H264HIGH10PROFILE:
+      return "h264high10";
+    case PP_VIDEOPROFILE_H264HIGH422PROFILE:
+      return "h264high422";
+    case PP_VIDEOPROFILE_H264HIGH444PREDICTIVEPROFILE:
+      return "h264high444predictive";
+    case PP_VIDEOPROFILE_H264SCALABLEBASELINE:
+      return "h264scalablebaseline";
+    case PP_VIDEOPROFILE_H264SCALABLEHIGH:
+      return "h264scalablehigh";
+    case PP_VIDEOPROFILE_H264STEREOHIGH:
+      return "h264stereohigh";
+    case PP_VIDEOPROFILE_H264MULTIVIEWHIGH:
+      return "h264multiviewhigh";
+    case PP_VIDEOPROFILE_VP8_ANY:
+      return "vp8";
+    case PP_VIDEOPROFILE_VP9_ANY:
+      return "vp9";
+    // No default to catch unhandled profiles.
+  }
+  return "unknown";
+}
+
+std::string HardwareAccelerationToString(PP_HardwareAcceleration acceleration) {
+  switch (acceleration) {
+    case PP_HARDWAREACCELERATION_ONLY:
+      return "hardware";
+    case PP_HARDWAREACCELERATION_WITHFALLBACK:
+      return "hardware/software";
+    case PP_HARDWAREACCELERATION_NONE:
+      return "software";
+    // No default to catch unhandled accelerations.
+  }
+  return "unknown";
+}
+
+// This object is the global object representing this plugin library as long
+// as it is loaded.
+class VideoEncoderModule : public pp::Module {
+ public:
+  VideoEncoderModule() : pp::Module() {}
+  virtual ~VideoEncoderModule() {}
+
+  virtual pp::Instance* CreateInstance(PP_Instance instance);
+};
+
+class VideoEncoderInstance : public pp::Instance {
+ public:
+  VideoEncoderInstance(PP_Instance instance, pp::Module* module);
+  virtual ~VideoEncoderInstance();
+
+  // pp::Instance implementation.
+  virtual void HandleMessage(const pp::Var& var_message);
+
+ private:
+  void ConfigureTrack();
+  void OnConfiguredTrack(int32_t result);
+  void ProbeEncoder();
+  void OnEncoderProbed(int32_t result,
+                       const std::vector<PP_VideoProfileDescription> profiles);
+  void OnInitializedEncoder(int32_t result);
+  void ScheduleNextEncode();
+  void GetEncoderFrameTick(int32_t result);
+  void GetEncoderFrame(const pp::VideoFrame& track_frame);
+  void OnEncoderFrame(int32_t result,
+                      pp::VideoFrame encoder_frame,
+                      pp::VideoFrame track_frame);
+  int32_t CopyVideoFrame(pp::VideoFrame dest, pp::VideoFrame src);
+  void EncodeFrame(const pp::VideoFrame& frame);
+  void OnEncodeDone(int32_t result);
+  void OnGetBitstreamBuffer(int32_t result, PP_BitstreamBuffer buffer);
+  void StartTrackFrames();
+  void StopTrackFrames();
+  void OnTrackFrame(int32_t result, pp::VideoFrame frame);
+
+  void StopEncode();
+
+  void LogError(int32_t error, const std::string& message);
+  void Log(const std::string& message);
+
+  void PostDataMessage(const void* buffer, uint32_t size);
+  void PostSignalMessage(const char* name);
+
+  bool is_encoding_;
+  bool is_receiving_track_frames_;
+
+  pp::VideoEncoder video_encoder_;
+  pp::MediaStreamVideoTrack video_track_;
+  pp::CompletionCallbackFactory<VideoEncoderInstance> callback_factory_;
+
+  PP_VideoProfile video_profile_;
+  PP_VideoFrame_Format frame_format_;
+
+  pp::Size requested_size_;
+  pp::Size frame_size_;
+  pp::Size encoder_size_;
+  uint32_t encoded_frames_;
+
+  pp::VideoFrame current_track_frame_;
+};
+
+VideoEncoderInstance::VideoEncoderInstance(PP_Instance instance,
+                                           pp::Module* module)
+    : pp::Instance(instance),
+      is_encoding_(false),
+      callback_factory_(this),
+#if defined(USE_VP8_INSTEAD_OF_H264)
+      video_profile_(PP_VIDEOPROFILE_VP8_ANY),
+#else
+      video_profile_(PP_VIDEOPROFILE_H264MAIN),
+#endif
+      frame_format_(PP_VIDEOFRAME_FORMAT_I420),
+      encoded_frames_(0) {
+}
+
+VideoEncoderInstance::~VideoEncoderInstance() {
+}
+
+void VideoEncoderInstance::ConfigureTrack() {
+  if (encoder_size_.IsEmpty())
+    frame_size_ = requested_size_;
+  else
+    frame_size_ = encoder_size_;
+
+  int32_t attrib_list[] = {PP_MEDIASTREAMVIDEOTRACK_ATTRIB_FORMAT,
+                           frame_format_,
+                           PP_MEDIASTREAMVIDEOTRACK_ATTRIB_WIDTH,
+                           frame_size_.width(),
+                           PP_MEDIASTREAMVIDEOTRACK_ATTRIB_HEIGHT,
+                           frame_size_.height(),
+                           PP_MEDIASTREAMVIDEOTRACK_ATTRIB_NONE};
+
+  pp::VarDictionary dict;
+  dict.Set(pp::Var("status"), pp::Var("configuring video track"));
+  dict.Set(pp::Var("width"), pp::Var(frame_size_.width()));
+  dict.Set(pp::Var("height"), pp::Var(frame_size_.height()));
+  PostMessage(dict);
+
+  video_track_.Configure(
+      attrib_list,
+      callback_factory_.NewCallback(&VideoEncoderInstance::OnConfiguredTrack));
+}
+
+void VideoEncoderInstance::OnConfiguredTrack(int32_t result) {
+  if (result != PP_OK) {
+    LogError(result, "Cannot configure track");
+    return;
+  }
+
+  if (is_encoding_) {
+    StartTrackFrames();
+    ScheduleNextEncode();
+  } else
+    ProbeEncoder();
+}
+
+void VideoEncoderInstance::ProbeEncoder() {
+  video_encoder_ = pp::VideoEncoder(this);
+  video_encoder_.GetSupportedProfiles(callback_factory_.NewCallbackWithOutput(
+      &VideoEncoderInstance::OnEncoderProbed));
+}
+
+void VideoEncoderInstance::OnEncoderProbed(
+    int32_t result,
+    const std::vector<PP_VideoProfileDescription> profiles) {
+  bool has_required_profile = false;
+
+  Log("Available profiles:");
+  for (const PP_VideoProfileDescription& profile : profiles) {
+    std::ostringstream oss;
+    oss << " profile=" << VideoProfileToString(profile.profile)
+        << " max_resolution=" << profile.max_resolution.width << "x"
+        << profile.max_resolution.height
+        << " max_framerate=" << profile.max_framerate_numerator << "/"
+        << profile.max_framerate_denominator << " acceleration="
+        << HardwareAccelerationToString(profile.acceleration);
+    Log(oss.str());
+
+    has_required_profile |= profile.profile == video_profile_;
+  }
+
+  if (!has_required_profile) {
+    std::ostringstream oss;
+    oss << "Cannot find required video profile: ";
+    oss << VideoProfileToString(video_profile_);
+    LogError(PP_ERROR_FAILED, oss.str());
+    return;
+  }
+
+  video_encoder_ = pp::VideoEncoder(this);
+
+  pp::VarDictionary dict;
+  dict.Set(pp::Var("status"), pp::Var("initializing encoder"));
+  dict.Set(pp::Var("width"), pp::Var(encoder_size_.width()));
+  dict.Set(pp::Var("height"), pp::Var(encoder_size_.height()));
+  PostMessage(dict);
+
+  int32_t error = video_encoder_.Initialize(
+      frame_format_, frame_size_, video_profile_, 2000000,
+      PP_HARDWAREACCELERATION_WITHFALLBACK,
+      callback_factory_.NewCallback(
+          &VideoEncoderInstance::OnInitializedEncoder));
+  if (error != PP_OK_COMPLETIONPENDING) {
+    LogError(error, "Cannot initialize encoder");
+    return;
+  }
+}
+
+void VideoEncoderInstance::OnInitializedEncoder(int32_t result) {
+  if (result != PP_OK) {
+    LogError(result, "Encoder initialization failed");
+    return;
+  }
+
+  is_encoding_ = true;
+
+  if (video_encoder_.GetFrameCodedSize(&encoder_size_) != PP_OK) {
+    LogError(result, "Cannot get encoder coded frame size");
+    return;
+  }
+
+  pp::VarDictionary dict;
+  dict.Set(pp::Var("status"), pp::Var("encoder initialized"));
+  dict.Set(pp::Var("width"), pp::Var(encoder_size_.width()));
+  dict.Set(pp::Var("height"), pp::Var(encoder_size_.height()));
+  PostMessage(dict);
+
+  video_encoder_.GetBitstreamBuffer(callback_factory_.NewCallbackWithOutput(
+      &VideoEncoderInstance::OnGetBitstreamBuffer));
+
+  if (encoder_size_ != frame_size_)
+    ConfigureTrack();
+  else {
+    StartTrackFrames();
+    ScheduleNextEncode();
+  }
+}
+
+void VideoEncoderInstance::ScheduleNextEncode() {
+  pp::Module::Get()->core()->CallOnMainThread(
+      1000 / 30,
+      callback_factory_.NewCallback(&VideoEncoderInstance::GetEncoderFrameTick),
+      0);
+}
+
+void VideoEncoderInstance::GetEncoderFrameTick(int32_t result) {
+  if (is_encoding_) {
+    if (!current_track_frame_.is_null()) {
+      pp::VideoFrame frame = current_track_frame_;
+      current_track_frame_.detach();
+      GetEncoderFrame(frame);
+    }
+    ScheduleNextEncode();
+  }
+}
+
+void VideoEncoderInstance::GetEncoderFrame(const pp::VideoFrame& track_frame) {
+  video_encoder_.GetVideoFrame(callback_factory_.NewCallbackWithOutput(
+      &VideoEncoderInstance::OnEncoderFrame, track_frame));
+}
+
+void VideoEncoderInstance::OnEncoderFrame(int32_t result,
+                                          pp::VideoFrame encoder_frame,
+                                          pp::VideoFrame track_frame) {
+  if (result == PP_ERROR_ABORTED) {
+    video_track_.RecycleFrame(track_frame);
+    return;
+  }
+  if (result != PP_OK) {
+    video_track_.RecycleFrame(track_frame);
+    LogError(result, "Cannot get video frame from video encoder");
+    return;
+  }
+
+  track_frame.GetSize(&frame_size_);
+
+  if (frame_size_ != encoder_size_) {
+    video_track_.RecycleFrame(track_frame);
+    LogError(PP_ERROR_FAILED, "MediaStreamVideoTrack frame size incorrect");
+    return;
+  }
+
+  if (CopyVideoFrame(encoder_frame, track_frame) == PP_OK)
+    EncodeFrame(encoder_frame);
+  video_track_.RecycleFrame(track_frame);
+}
+
+int32_t VideoEncoderInstance::CopyVideoFrame(pp::VideoFrame dest,
+                                             pp::VideoFrame src) {
+  if (dest.GetDataBufferSize() < src.GetDataBufferSize()) {
+    std::ostringstream oss;
+    oss << "Incorrect destination video frame buffer size : "
+        << dest.GetDataBufferSize() << " < " << src.GetDataBufferSize();
+    LogError(PP_ERROR_FAILED, oss.str());
+    return PP_ERROR_FAILED;
+  }
+
+  memcpy(dest.GetDataBuffer(), src.GetDataBuffer(), src.GetDataBufferSize());
+  return PP_OK;
+}
+
+void VideoEncoderInstance::EncodeFrame(const pp::VideoFrame& frame) {
+  video_encoder_.Encode(
+      frame, PP_FALSE,
+      callback_factory_.NewCallback(&VideoEncoderInstance::OnEncodeDone));
+}
+
+void VideoEncoderInstance::OnEncodeDone(int32_t result) {
+  if (result == PP_ERROR_ABORTED)
+    return;
+  if (result != PP_OK)
+    LogError(result, "Encode failed");
+}
+
+void VideoEncoderInstance::OnGetBitstreamBuffer(int32_t result,
+                                                PP_BitstreamBuffer buffer) {
+  if (result == PP_ERROR_ABORTED)
+    return;
+  if (result != PP_OK) {
+    LogError(result, "Cannot get bitstream buffer");
+    return;
+  }
+
+  encoded_frames_++;
+  PostDataMessage(buffer.buffer, buffer.size);
+  video_encoder_.RecycleBitstreamBuffer(buffer);
+
+  video_encoder_.GetBitstreamBuffer(callback_factory_.NewCallbackWithOutput(
+      &VideoEncoderInstance::OnGetBitstreamBuffer));
+}
+
+void VideoEncoderInstance::StartTrackFrames() {
+  is_receiving_track_frames_ = true;
+  video_track_.GetFrame(callback_factory_.NewCallbackWithOutput(
+      &VideoEncoderInstance::OnTrackFrame));
+}
+
+void VideoEncoderInstance::StopTrackFrames() {
+  is_receiving_track_frames_ = false;
+  if (!current_track_frame_.is_null()) {
+    video_track_.RecycleFrame(current_track_frame_);
+    current_track_frame_.detach();
+  }
+}
+
+void VideoEncoderInstance::OnTrackFrame(int32_t result, pp::VideoFrame frame) {
+  if (result == PP_ERROR_ABORTED)
+    return;
+
+  if (!current_track_frame_.is_null()) {
+    video_track_.RecycleFrame(current_track_frame_);
+    current_track_frame_.detach();
+  }
+
+  if (result != PP_OK) {
+    LogError(result, "Cannot get video frame from video track");
+    return;
+  }
+
+  current_track_frame_ = frame;
+  if (is_receiving_track_frames_)
+    video_track_.GetFrame(callback_factory_.NewCallbackWithOutput(
+        &VideoEncoderInstance::OnTrackFrame));
+}
+
+void VideoEncoderInstance::StopEncode() {
+  video_encoder_.Close();
+  StopTrackFrames();
+  video_track_.Close();
+  is_encoding_ = false;
+  encoded_frames_ = 0;
+}
+
+//
+
+void VideoEncoderInstance::HandleMessage(const pp::Var& var_message) {
+  if (!var_message.is_dictionary()) {
+    LogToConsole(PP_LOGLEVEL_ERROR, pp::Var("Invalid message!"));
+    return;
+  }
+
+  pp::VarDictionary dict_message(var_message);
+  std::string command = dict_message.Get("command").AsString();
+
+  if (command == "start") {
+    requested_size_ = pp::Size(dict_message.Get("width").AsInt(),
+                               dict_message.Get("height").AsInt());
+    pp::Var var_track = dict_message.Get("track");
+    if (!var_track.is_resource()) {
+      LogToConsole(PP_LOGLEVEL_ERROR, pp::Var("Given track is not a resource"));
+      return;
+    }
+    pp::Resource resource_track = var_track.AsResource();
+    video_track_ = pp::MediaStreamVideoTrack(resource_track);
+    video_encoder_ = pp::VideoEncoder();
+    ConfigureTrack();
+  } else if (command == "stop") {
+    StopEncode();
+    PostSignalMessage("stopped");
+  } else {
+    LogToConsole(PP_LOGLEVEL_ERROR, pp::Var("Invalid command!"));
+  }
+}
+
+void VideoEncoderInstance::PostDataMessage(const void* buffer, uint32_t size) {
+  pp::VarDictionary dictionary;
+
+  dictionary.Set(pp::Var("name"), pp::Var("data"));
+
+  pp::VarArrayBuffer array_buffer(size);
+  void* data_ptr = array_buffer.Map();
+  memcpy(data_ptr, buffer, size);
+  array_buffer.Unmap();
+  dictionary.Set(pp::Var("data"), array_buffer);
+
+  PostMessage(dictionary);
+}
+
+void VideoEncoderInstance::PostSignalMessage(const char* name) {
+  pp::VarDictionary dictionary;
+  dictionary.Set(pp::Var("name"), pp::Var(name));
+
+  PostMessage(dictionary);
+}
+
+void VideoEncoderInstance::LogError(int32_t error, const std::string& message) {
+  std::string msg("Error: ");
+  msg.append(pp::Var(error).DebugString());
+  msg.append(" : ");
+  msg.append(message);
+  LogToConsole(PP_LOGLEVEL_ERROR, pp::Var(msg));
+}
+
+void VideoEncoderInstance::Log(const std::string& message) {
+  LogToConsole(PP_LOGLEVEL_LOG, pp::Var(message));
+}
+
+pp::Instance* VideoEncoderModule::CreateInstance(PP_Instance instance) {
+  return new VideoEncoderInstance(instance, this);
+}
+
+}  // anonymous namespace
+
+namespace pp {
+// Factory function for your specialization of the Module object.
+Module* CreateModule() {
+  return new VideoEncoderModule();
+}
+}  // namespace pp