Cloning a bunch of stuff from the native_client repository at r6528

ppapi/native_client/tests/ppapi_example_audio/audio.cc

Index: ppapi/native_client/tests/ppapi_example_audio/audio.cc
===================================================================
--- ppapi/native_client/tests/ppapi_example_audio/audio.cc	(revision 0)
+++ ppapi/native_client/tests/ppapi_example_audio/audio.cc	(revision 0)
@@ -0,0 +1,302 @@
+// Copyright (c) 2011 The Native Client 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 <nacl/nacl_log.h>
+
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <cmath>
+#include <limits>
+#include <string>
+#include <nacl/nacl_inttypes.h>
+
+#include "native_client/src/shared/ppapi_proxy/utility.h"
+#include "ppapi/c/pp_bool.h"
+#include "ppapi/c/pp_errors.h"
+#include "ppapi/c/ppb_audio.h"
+#include "ppapi/c/ppb_audio_config.h"
+#include "ppapi/cpp/audio.h"
+#include "ppapi/cpp/audio_config.h"
+#include "ppapi/cpp/completion_callback.h"
+#include "ppapi/cpp/instance.h"
+#include "ppapi/cpp/module.h"
+#include "ppapi/cpp/var.h"
+
+
+// Most of this example is borrowed from ppapi/examples/audio/audio.cc
+
+// Separate left and right frequency to make sure we didn't swap L & R.
+// Sounds pretty horrible, though...
+const double kDefaultFrequencyLeft = 400.0;
+const double kDefaultFrequencyRight = 1000.0;
+const uint32_t kDefaultDuration = 10000;
+
+// This sample frequency is guaranteed to work.
+const PP_AudioSampleRate kSampleFrequency = PP_AUDIOSAMPLERATE_44100;
+// Buffer size in units of sample frames.
+// 4096 is a conservative size that should avoid underruns on most systems.
+const uint32_t kSampleFrameCount = 4096;
+
+const double kPi = 3.141592653589;
+const double kTwoPi = 2.0 * kPi;
+
+void LogFailure(const char* msg) {
+  NaClLog(LOG_ERROR, "\n*** FAILURE **** example: %s", msg);
+}
+
+class MyInstance : public pp::Instance {
+ private:
+  void ParseArgs(uint32_t argc, const char* argn[], const char* argv[]) {
+    NaClLog(1, "example: parsing %d args\n", static_cast<int>(argc));
+    for (uint32_t i = 0; i < argc; ++i) {
+      NaClLog(1, "example: arg %d: [%s] [%s]\n",
+              static_cast<int>(i), argn[i], argv[i]);
+      const std::string tag = argn[i];
+      if (tag == "frequency_l") frequency_l_ = strtod(argv[i], 0);
+      if (tag == "frequency_r") frequency_r_ = strtod(argv[i], 0);
+      if (tag == "amplitude_l") amplitude_l_ = strtod(argv[i], 0);
+      if (tag == "amplitude_r") amplitude_r_ = strtod(argv[i], 0);
+      if (tag == "duration_msec") duration_msec_ = strtod(argv[i], 0);
+      if (tag == "basic_tests") basic_tests_ = (0 != atoi(argv[i]));
+      if (tag == "stress_tests") stress_tests_ = (0 != atoi(argv[i]));
+      if (tag == "headless") headless_ = (0 != atoi(argv[i]));
+      // ignore other tags
+    }
+  }
+
+ public:
+  explicit MyInstance(PP_Instance instance)
+      : pp::Instance(instance),
+        config_(NULL),
+        audio_(NULL),
+        audio_wave_l_(0.0),
+        audio_wave_r_(0.0),
+        frequency_l_(kDefaultFrequencyLeft),
+        frequency_r_(kDefaultFrequencyRight),
+        amplitude_l_(1.0),
+        amplitude_r_(1.0),
+        headless_(false),
+        basic_tests_(false),
+        stress_tests_(false),
+        duration_msec_(kDefaultDuration),
+        obtained_sample_frame_count_(0),
+        callback_count_(0) {}
+
+  virtual void HandleMessage(const pp::Var& message) {
+    NaClLog(1, "example: received HandleMessage\n");
+    if (message.is_string()) {
+      if (message.AsString() == "StartPlayback") {
+        StartOutput();
+      }
+    }
+  }
+
+  void StartOutput() {
+    bool audio_start_playback = audio_->StartPlayback();
+    CHECK(true == audio_start_playback);
+    NaClLog(1, "example: frequencies are %f %f\n", frequency_l_, frequency_r_);
+    NaClLog(1, "example: amplitudes are %f %f\n", amplitude_l_, amplitude_r_);
+    NaClLog(1, "example: Scheduling StopOutput on main thread in %"
+            NACL_PRIu32"msec\n", duration_msec_);
+    // Schedule a callback in duration_msec_ to stop audio output
+    pp::CompletionCallback cc(StopOutput, this);
+    pp::Module::Get()->core()->CallOnMainThread(duration_msec_, cc, PP_OK);
+  }
+
+  static void StopOutput(void* user_data, int32_t err) {
+    MyInstance* instance = static_cast<MyInstance*>(user_data);
+
+    const int kMaxResult = 256;
+    char result[kMaxResult];
+    NaClLog(1, "example: StopOutput() invoked on main thread\n");
+    if (PP_OK == err) {
+      if (instance->audio_->StopPlayback()) {
+        // In headless mode, the build bots may not have an audio driver, in
+        // which case the callback won't be invoked.
+        // TODO(nfullagar): Other ways to determine if machine has audio
+        // capabilities. Currently PPAPI returns a valid resource regardless.
+        if ((instance->callback_count_ >= 2) || instance->headless_) {
+          snprintf(result, kMaxResult, "StopOutput:PASSED");
+        } else {
+          snprintf(result, kMaxResult, "StopOutput:FAILED - too "
+              "few callbacks (only %d callbacks detected)",
+              static_cast<int>(instance->callback_count_));
+        }
+      }
+    } else {
+      snprintf(result, kMaxResult,
+          "StopOutput: FAILED - returned err is %d", static_cast<int>(err));
+    }
+    // Release audio & config instance.
+    delete instance->audio_;
+    delete instance->config_;
+    instance->audio_ = NULL;
+    instance->config_ = NULL;
+    // At this point the test has finished, report result.
+    pp::Var message(result);
+    instance->PostMessage(message);
+  }
+
+  // To enable basic tests, use basic_tests="1" in the embed tag.
+  void BasicTests() {
+    // Verify obtained_sample_frame_count isn't out of range.
+    CHECK(obtained_sample_frame_count_ >= PP_AUDIOMINSAMPLEFRAMECOUNT);
+    CHECK(obtained_sample_frame_count_ <= PP_AUDIOMAXSAMPLEFRAMECOUNT);
+    // Do some sanity checks below; verify c & cpp interfaces agree.
+    // Note: This is test code and is not normally needed for an application.
+    PPB_GetInterface get_browser_interface =
+        pp::Module::Get()->get_browser_interface();
+    const struct PPB_AudioConfig* audio_config_interface =
+        static_cast<const struct PPB_AudioConfig*>(
+        get_browser_interface(PPB_AUDIO_CONFIG_INTERFACE));
+    const struct PPB_Audio* audio_interface =
+        static_cast<const struct PPB_Audio*>(
+        get_browser_interface(PPB_AUDIO_INTERFACE));
+    PP_Resource audio_config_resource = config_->pp_resource();
+    PP_Resource audio_resource = audio_->pp_resource();
+    NaClLog(1, "example: audio config resource: %"NACL_PRId32"\n",
+            audio_config_resource);
+    NaClLog(1, "example: audio resource: %"NACL_PRId32"\n", audio_resource);
+    CHECK(PP_TRUE == audio_config_interface->
+        IsAudioConfig(audio_config_resource));
+    CHECK(PP_TRUE == audio_interface->IsAudio(audio_resource));
+    CHECK(PP_FALSE == audio_config_interface->IsAudioConfig(audio_resource));
+    CHECK(PP_FALSE == audio_interface->IsAudio(audio_config_resource));
+    CHECK(audio_interface->GetCurrentConfig(audio_resource) ==
+        audio_config_resource);
+    CHECK(0 == audio_interface->GetCurrentConfig(audio_config_resource));
+    CHECK(audio_config_interface->GetSampleRate(audio_config_resource) ==
+        config_->sample_rate());
+    CHECK(audio_config_interface->GetSampleFrameCount(audio_config_resource) ==
+        config_->sample_frame_count());
+    CHECK(audio_->config().pp_resource() == audio_config_resource);
+  }
+
+  // To enable stress tests, use stress_tests="1" in the embed tag.
+  void StressTests() {
+    // Attempt to create many audio devices, then immediately shut them down.
+    // Chrome may generate some warnings on the console, but should not crash.
+    const int kNumManyAudio = 1000;
+    pp::Audio* many_audio[kNumManyAudio];
+    for (int i = 0; i < kNumManyAudio; ++i)
+      many_audio[i] = new pp::Audio(this, *config_, SilenceCallback, this);
+    for (int i = 0; i < kNumManyAudio; ++i)
+      CHECK(true == many_audio[i]->StartPlayback());
+    for (int i = 0; i < kNumManyAudio; ++i)
+      delete many_audio[i];
+  }
+
+  void TestSuite() {
+    if (basic_tests_)
+      BasicTests();
+    if (stress_tests_)
+      StressTests();
+  }
+
+  virtual bool Init(uint32_t argc, const char* argn[], const char* argv[]) {
+    ParseArgs(argc, argn, argv);
+    obtained_sample_frame_count_ = pp::AudioConfig::RecommendSampleFrameCount(
+        kSampleFrequency, kSampleFrameCount);
+    config_ = new
+       pp::AudioConfig(this, kSampleFrequency, obtained_sample_frame_count_);
+    CHECK(NULL != config_);
+    audio_ = new pp::Audio(this, *config_, SineWaveCallback, this);
+    CHECK(NULL != audio_);
+    // Run through test suite before attempting real playback.
+    TestSuite();
+    return true;
+  }
+
+ private:
+  static void SineWaveCallback(void* samples, uint32_t num_bytes, void* thiz) {
+    MyInstance* instance = reinterpret_cast<MyInstance*>(thiz);
+    const double delta_l = kTwoPi * instance->frequency_l_ / kSampleFrequency;
+    const double delta_r = kTwoPi * instance->frequency_r_ / kSampleFrequency;
+
+    // Verify num_bytes and obtained_sample_frame_count match up.
+    const int kNumChannelsForStereo = 2;
+    const int kSizeOfSample = sizeof(int16_t);
+    const size_t single_sample = kNumChannelsForStereo * kSizeOfSample;
+
+    // CHECK inside callback is only for testing purposes.
+    CHECK(instance->obtained_sample_frame_count_ * single_sample == num_bytes);
+
+    // Use per channel audio wave value to avoid clicks on buffer boundries.
+    double wave_l = instance->audio_wave_l_;
+    double wave_r = instance->audio_wave_r_;
+    const int16_t max_int16 = std::numeric_limits<int16_t>::max();
+    int16_t* buf = reinterpret_cast<int16_t*>(samples);
+    for (size_t i = 0; i < instance->obtained_sample_frame_count_; ++i) {
+      const double l = sin(wave_l) * instance->amplitude_l_ * max_int16;
+      const double r = sin(wave_r) * instance->amplitude_r_ * max_int16;
+      *buf++ = static_cast<int16_t>(l);
+      *buf++ = static_cast<int16_t>(r);
+      // Add delta, keep within -kTwoPi..kTwoPi to preserve precision.
+      wave_l += delta_l;
+      if (wave_l > kTwoPi)
+        wave_l -= kTwoPi * 2.0;
+      wave_r += delta_r;
+      if (wave_r > kTwoPi)
+        wave_r -= kTwoPi * 2.0;
+    }
+    // Store current value to use as starting point for next callback.
+    instance->audio_wave_l_ = wave_l;
+    instance->audio_wave_r_ = wave_r;
+
+    ++instance->callback_count_;
+  }
+
+  static void SilenceCallback(void* samples, uint32_t num_bytes, void* thiz) {
+    memset(samples, 0, num_bytes);
+  }
+
+  // Audio config resource. Allocated in Init().
+  pp::AudioConfig* config_;
+
+  // Audio resource. Allocated in Init().
+  pp::Audio* audio_;
+
+  // Current audio wave position, used to prevent sine wave skips
+  // on buffer boundaries.
+  double audio_wave_l_;
+  double audio_wave_r_;
+
+  double frequency_l_;
+  double frequency_r_;
+
+  double amplitude_l_;
+  double amplitude_r_;
+
+  bool headless_;
+
+  bool basic_tests_;
+  bool stress_tests_;
+
+  uint32_t duration_msec_;
+  uint32_t obtained_sample_frame_count_;
+
+  int callback_count_;
+};
+
+class MyModule : public pp::Module {
+ public:
+  // Override CreateInstance to create your customized Instance object.
+  virtual pp::Instance* CreateInstance(PP_Instance instance) {
+    return new MyInstance(instance);
+  }
+};
+
+namespace pp {
+
+// Factory function for your specialization of the Module object.
+Module* CreateModule() {
+  NaClLogModuleInit();
+  return new MyModule();
+}
+
+}  // namespace pp