// Copyright (c) 2012 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/openbsd/audio_manager_openbsd.h"

#include <fcntl.h>

#include "base/command_line.h"
#include "base/file_path.h"
#include "base/stl_util.h"
#include "media/audio/audio_output_dispatcher.h"
#include "media/audio/audio_parameters.h"
#include "media/audio/pulse/pulse_output.h"
#include "media/audio/pulse/pulse_stubs.h"
#include "media/base/channel_layout.h"
#include "media/base/limits.h"
#include "media/base/media_switches.h"

using media_audio_pulse::kModulePulse;
using media_audio_pulse::InitializeStubs;
using media_audio_pulse::StubPathMap;

namespace media {

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

// Default sample rate for input and output streams.
static const int kDefaultSampleRate = 48000;

static const base::FilePath::CharType kPulseLib[] =
    FILE_PATH_LITERAL("libpulse.so.0");

// Implementation of AudioManager.
static bool HasAudioHardware() {
  int fd;
  const char *file;

  if ((file = getenv("AUDIOCTLDEVICE")) == 0 || *file == '\0')
    file = "/dev/audioctl";

  if ((fd = open(file, O_RDONLY)) < 0)
    return false;

  close(fd);
  return true;
}

bool AudioManagerOpenBSD::HasAudioOutputDevices() {
  return HasAudioHardware();
}

bool AudioManagerOpenBSD::HasAudioInputDevices() {
  return HasAudioHardware();
}

AudioParameters AudioManagerOpenBSD::GetInputStreamParameters(
    const std::string& device_id) {
  static const int kDefaultInputBufferSize = 1024;

  int user_buffer_size = GetUserBufferSize();
  int buffer_size = user_buffer_size ?
      user_buffer_size : kDefaultInputBufferSize;

  return AudioParameters(
      AudioParameters::AUDIO_PCM_LOW_LATENCY, CHANNEL_LAYOUT_STEREO,
      kDefaultSampleRate, 16, buffer_size);
}

AudioManagerOpenBSD::AudioManagerOpenBSD(AudioLogFactory* audio_log_factory)
    : AudioManagerBase(audio_log_factory),
      pulse_library_is_initialized_(false) {
  SetMaxOutputStreamsAllowed(kMaxOutputStreams);
  StubPathMap paths;

  // Check if the pulse library is avialbale.
  paths[kModulePulse].push_back(kPulseLib);
  if (!InitializeStubs(paths)) {
    DLOG(WARNING) << "Failed on loading the Pulse library and symbols";
    return;
  }

  pulse_library_is_initialized_ = true;
}

AudioManagerOpenBSD::~AudioManagerOpenBSD() {
  Shutdown();
}

AudioOutputStream* AudioManagerOpenBSD::MakeLinearOutputStream(
    const AudioParameters& params) {
  DCHECK_EQ(AudioParameters::AUDIO_PCM_LINEAR, params.format);
  return MakeOutputStream(params);
}

AudioOutputStream* AudioManagerOpenBSD::MakeLowLatencyOutputStream(
    const AudioParameters& params,
    const std::string& device_id) {
  DLOG_IF(ERROR, !device_id.empty()) << "Not implemented!";
  DCHECK_EQ(AudioParameters::AUDIO_PCM_LOW_LATENCY, params.format);
  return MakeOutputStream(params);
}

AudioInputStream* AudioManagerOpenBSD::MakeLinearInputStream(
    const AudioParameters& params, const std::string& device_id) {
  DCHECK_EQ(AudioParameters::AUDIO_PCM_LINEAR, params.format);
  NOTIMPLEMENTED();
  return NULL;
}

AudioInputStream* AudioManagerOpenBSD::MakeLowLatencyInputStream(
    const AudioParameters& params, const std::string& device_id) {
  DCHECK_EQ(AudioParameters::AUDIO_PCM_LOW_LATENCY, params.format);
  NOTIMPLEMENTED();
  return NULL;
}

AudioParameters AudioManagerOpenBSD::GetPreferredOutputStreamParameters(
    const std::string& output_device_id,
    const AudioParameters& input_params) {
  // TODO(tommi): Support |output_device_id|.
  DLOG_IF(ERROR, !output_device_id.empty()) << "Not implemented!";
  static const int kDefaultOutputBufferSize = 512;

  ChannelLayout channel_layout = CHANNEL_LAYOUT_STEREO;
  int sample_rate = kDefaultSampleRate;
  int buffer_size = kDefaultOutputBufferSize;
  int bits_per_sample = 16;
  if (input_params.IsValid()) {
    sample_rate = input_params.sample_rate();
    bits_per_sample = input_params.bits_per_sample();
    channel_layout = input_params.channel_layout();
    buffer_size = std::min(buffer_size, input_params.frames_per_buffer());
  }

  int user_buffer_size = GetUserBufferSize();
  if (user_buffer_size)
    buffer_size = user_buffer_size;

  return AudioParameters(
      AudioParameters::AUDIO_PCM_LOW_LATENCY, channel_layout,
      sample_rate, bits_per_sample, buffer_size, AudioParameters::NO_EFFECTS);
}

AudioOutputStream* AudioManagerOpenBSD::MakeOutputStream(
    const AudioParameters& params) {
  if (pulse_library_is_initialized_)
    return new PulseAudioOutputStream(params, this);

  return NULL;
}

// TODO(xians): Merge AudioManagerOpenBSD with AudioManagerPulse;
// static
AudioManager* CreateAudioManager(AudioLogFactory* audio_log_factory) {
  return new AudioManagerOpenBSD(audio_log_factory);
}

}  // namespace media