// Copyright (c) 2011 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 "media/audio/audio_io.h"

#include <windows.h>
#include <objbase.h>  // This has to be before initguid.h
#include <initguid.h>
#include <mmsystem.h>
#include <setupapi.h>

#include "base/basictypes.h"
#include "base/command_line.h"
#include "base/file_path.h"
#include "base/memory/scoped_ptr.h"
#include "base/path_service.h"
#include "base/process_util.h"
#include "base/string_number_conversions.h"
#include "base/string_util.h"
#include "base/win/windows_version.h"
#include "media/audio/fake_audio_input_stream.h"
#include "media/audio/fake_audio_output_stream.h"
#include "media/audio/win/audio_manager_win.h"
#include "media/audio/win/wavein_input_win.h"
#include "media/audio/win/waveout_output_win.h"
#include "media/base/limits.h"

// Libraries required for the SetupAPI and Wbem APIs used here.
#pragma comment(lib, "setupapi.lib")

// The following are defined in various DDK headers, and we (re)define them
// here to avoid adding the DDK as a chrome dependency.
#define DRV_QUERYDEVICEINTERFACE 0x80c
#define DRVM_MAPPER_PREFERRED_GET 0x2015
#define DRV_QUERYDEVICEINTERFACESIZE 0x80d
DEFINE_GUID(AM_KSCATEGORY_AUDIO, 0x6994ad04, 0x93ef, 0x11d0,
            0xa3, 0xcc, 0x00, 0xa0, 0xc9, 0x22, 0x31, 0x96);

// Maximum number of output streams that can be open simultaneously.
static const size_t kMaxOutputStreams = 50;

// Up to 8 channels can be passed to the driver.
// This should work, given the right drivers, but graceful error handling is
// needed.
static const int kWinMaxChannels = 8;

static const int kWinMaxInputChannels = 2;
// We use 3 buffers for recording audio so that if a recording callback takes
// some time to return we won't lose audio. More buffers while recording are
// ok because they don't introduce any delay in recording, unlike in playback
// where you first need to fill in that number of buffers before starting to
// play.
static const int kNumInputBuffers = 3;

static int GetVersionPartAsInt(DWORDLONG num) {
  return static_cast<int>(num & 0xffff);
}

// Returns a string containing the given device's description and installed
// driver version.
static string16 GetDeviceAndDriverInfo(HDEVINFO device_info,
                                       SP_DEVINFO_DATA* device_data) {
  // Save the old install params setting and set a flag for the
  // SetupDiBuildDriverInfoList below to return only the installed drivers.
  SP_DEVINSTALL_PARAMS old_device_install_params;
  old_device_install_params.cbSize = sizeof(old_device_install_params);
  SetupDiGetDeviceInstallParams(device_info, device_data,
                                &old_device_install_params);
  SP_DEVINSTALL_PARAMS device_install_params = old_device_install_params;
  device_install_params.FlagsEx |= DI_FLAGSEX_INSTALLEDDRIVER;
  SetupDiSetDeviceInstallParams(device_info, device_data,
                                &device_install_params);

  SP_DRVINFO_DATA driver_data;
  driver_data.cbSize = sizeof(driver_data);
  string16 device_and_driver_info;
  if (SetupDiBuildDriverInfoList(device_info, device_data,
                                 SPDIT_COMPATDRIVER)) {
    if (SetupDiEnumDriverInfo(device_info, device_data, SPDIT_COMPATDRIVER, 0,
                              &driver_data)) {
      DWORDLONG version = driver_data.DriverVersion;
      device_and_driver_info = string16(driver_data.Description) + L" v" +
          base::IntToString16(GetVersionPartAsInt((version >> 48))) + L"." +
          base::IntToString16(GetVersionPartAsInt((version >> 32))) + L"." +
          base::IntToString16(GetVersionPartAsInt((version >> 16))) + L"." +
          base::IntToString16(GetVersionPartAsInt(version));
    }
    SetupDiDestroyDriverInfoList(device_info, device_data, SPDIT_COMPATDRIVER);
  }

  SetupDiSetDeviceInstallParams(device_info, device_data,
                                &old_device_install_params);

  return device_and_driver_info;
}

AudioManagerWin::AudioManagerWin()
    : num_output_streams_(0) {
}

AudioManagerWin::~AudioManagerWin() {
}

bool AudioManagerWin::HasAudioOutputDevices() {
  return (::waveOutGetNumDevs() != 0);
}

bool AudioManagerWin::HasAudioInputDevices() {
  return (::waveInGetNumDevs() != 0);
}

// Factory for the implementations of AudioOutputStream. Two implementations
// should suffice most windows user's needs.
// - PCMWaveOutAudioOutputStream: Based on the waveOutWrite API (in progress)
// - PCMDXSoundAudioOutputStream: Based on DirectSound or XAudio (future work).
AudioOutputStream* AudioManagerWin::MakeAudioOutputStream(
    AudioParameters params) {
  if (!params.IsValid() || (params.channels > kWinMaxChannels))
    return NULL;

  // Limit the number of audio streams opened.
  if (num_output_streams_ >= kMaxOutputStreams) {
    return NULL;
  }

  if (params.format == AudioParameters::AUDIO_MOCK) {
    return FakeAudioOutputStream::MakeFakeStream(params);
  } else if (params.format == AudioParameters::AUDIO_PCM_LINEAR) {
    num_output_streams_++;
    return new PCMWaveOutAudioOutputStream(this, params, 3, WAVE_MAPPER);
  } else if (params.format == AudioParameters::AUDIO_PCM_LOW_LATENCY) {
    num_output_streams_++;
    // TODO(cpu): waveout cannot hit 20ms latency. Use other method.
    return new PCMWaveOutAudioOutputStream(this, params, 2, WAVE_MAPPER);
  }
  return NULL;
}

// Factory for the implementations of AudioInputStream.
AudioInputStream* AudioManagerWin::MakeAudioInputStream(
    AudioParameters params) {
  if (!params.IsValid() || (params.channels > kWinMaxInputChannels))
    return NULL;

  if (params.format == AudioParameters::AUDIO_MOCK) {
    return FakeAudioInputStream::MakeFakeStream(params);
  } else if (params.format == AudioParameters::AUDIO_PCM_LINEAR) {
    return new PCMWaveInAudioInputStream(this, params, kNumInputBuffers,
                                         WAVE_MAPPER);
  }
  return NULL;
}

void AudioManagerWin::ReleaseOutputStream(PCMWaveOutAudioOutputStream* stream) {
  DCHECK(stream);
  num_output_streams_--;
  delete stream;
}

void AudioManagerWin::ReleaseInputStream(PCMWaveInAudioInputStream* stream) {
  delete stream;
}

void AudioManagerWin::MuteAll() {
}

void AudioManagerWin::UnMuteAll() {
}

string16 AudioManagerWin::GetAudioInputDeviceModel() {
  // Get the default audio capture device and its device interface name.
  DWORD device_id = 0;
  waveInMessage(reinterpret_cast<HWAVEIN>(WAVE_MAPPER),
                DRVM_MAPPER_PREFERRED_GET,
                reinterpret_cast<DWORD_PTR>(&device_id), NULL);
  ULONG device_interface_name_size = 0;
  waveInMessage(reinterpret_cast<HWAVEIN>(device_id),
                DRV_QUERYDEVICEINTERFACESIZE,
                reinterpret_cast<DWORD_PTR>(&device_interface_name_size), 0);
  if (device_interface_name_size == 0)  // No audio capture device?
    return string16();

  string16 device_interface_name;
  string16::value_type* name_ptr = WriteInto(&device_interface_name,
      device_interface_name_size / sizeof(string16::value_type));
  waveInMessage(reinterpret_cast<HWAVEIN>(device_id),
                DRV_QUERYDEVICEINTERFACE,
                reinterpret_cast<DWORD_PTR>(name_ptr),
                static_cast<DWORD_PTR>(device_interface_name_size));

  // Enumerate all audio devices and find the one matching the above device
  // interface name.
  HDEVINFO device_info = SetupDiGetClassDevs(
      &AM_KSCATEGORY_AUDIO, 0, 0, DIGCF_DEVICEINTERFACE | DIGCF_PRESENT);
  if (device_info == INVALID_HANDLE_VALUE)
    return string16();

  DWORD interface_index = 0;
  SP_DEVICE_INTERFACE_DATA interface_data;
  interface_data.cbSize = sizeof(interface_data);
  while (SetupDiEnumDeviceInterfaces(device_info, 0, &AM_KSCATEGORY_AUDIO,
                                     interface_index++, &interface_data)) {
    // Query the size of the struct, allocate it and then query the data.
    SP_DEVINFO_DATA device_data;
    device_data.cbSize = sizeof(device_data);
    DWORD interface_detail_size = 0;
    SetupDiGetDeviceInterfaceDetail(device_info, &interface_data, 0, 0,
                                    &interface_detail_size, &device_data);
    if (!interface_detail_size)
      continue;

    scoped_array<char> interface_detail_buffer(new char[interface_detail_size]);
    SP_DEVICE_INTERFACE_DETAIL_DATA* interface_detail =
        reinterpret_cast<SP_DEVICE_INTERFACE_DETAIL_DATA*>(
            interface_detail_buffer.get());
    interface_detail->cbSize = interface_detail_size;
    if (!SetupDiGetDeviceInterfaceDetail(device_info, &interface_data,
                                         interface_detail,
                                         interface_detail_size, NULL,
                                         &device_data))
      return string16();

    bool device_found = (device_interface_name == interface_detail->DevicePath);

    if (device_found)
      return GetDeviceAndDriverInfo(device_info, &device_data);
  }

  return string16();
}

bool AudioManagerWin::CanShowAudioInputSettings() {
  return true;
}

void AudioManagerWin::ShowAudioInputSettings() {
  std::wstring program;
  std::string argument;
  if (base::win::GetVersion() <= base::win::VERSION_XP) {
    program = L"sndvol32.exe";
    argument = "-R";
  } else {
    program = L"control.exe";
    argument = "mmsys.cpl,,1";
  }

  FilePath path;
  PathService::Get(base::DIR_SYSTEM, &path);
  path = path.Append(program);
  CommandLine command_line(path);
  command_line.AppendArg(argument);
  base::LaunchApp(command_line, false, false, NULL);
}

// static
AudioManager* AudioManager::CreateAudioManager() {
  return new AudioManagerWin();
}