/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "MP4Decoder.h"
#include "MP4Reader.h"
#include "MediaDecoderStateMachine.h"
#include "MediaFormatReader.h"
#include "MP4Demuxer.h"
#include "mozilla/Preferences.h"
#include "nsCharSeparatedTokenizer.h"
#include "prlog.h"

#ifdef XP_WIN
#include "mozilla/WindowsVersion.h"
#include "WMFDecoderModule.h"
#endif
#ifdef MOZ_WIDGET_ANDROID
#include "nsIGfxInfo.h"
#include "AndroidBridge.h"
#endif

namespace mozilla {

MediaDecoderStateMachine* MP4Decoder::CreateStateMachine()
{
  bool useFormatDecoder =
    Preferences::GetBool("media.format-reader.mp4", true);
  nsRefPtr<MediaDecoderReader> reader = useFormatDecoder ?
    static_cast<MediaDecoderReader*>(new MediaFormatReader(this, new MP4Demuxer(GetResource()))) :
    static_cast<MediaDecoderReader*>(new MP4Reader(this));

  return new MediaDecoderStateMachine(this, reader);
}

static bool
IsSupportedAudioCodec(const nsAString& aCodec,
                      bool& aOutContainsAAC,
                      bool& aOutContainsMP3)
{
  // AAC-LC or HE-AAC in M4A.
  aOutContainsAAC = aCodec.EqualsASCII("mp4a.40.2") ||
                    aCodec.EqualsASCII("mp4a.40.5");
  if (aOutContainsAAC) {
#ifdef XP_WIN
    if (!Preferences::GetBool("media.fragmented-mp4.use-blank-decoder") &&
        !WMFDecoderModule::HasAAC()) {
      return false;
    }
#endif
    return true;
  }
#ifndef MOZ_GONK_MEDIACODEC // B2G doesn't support MP3 in MP4 yet.
  aOutContainsMP3 = aCodec.EqualsASCII("mp3");
  if (aOutContainsMP3) {
    return true;
  }
#else
  aOutContainsMP3 = false;
#endif
  return false;
}

static bool
IsSupportedH264Codec(const nsAString& aCodec)
{
  int16_t profile = 0, level = 0;

  if (!ExtractH264CodecDetails(aCodec, profile, level)) {
    return false;
  }

#ifdef XP_WIN
  if (!Preferences::GetBool("media.fragmented-mp4.use-blank-decoder") &&
      !WMFDecoderModule::HasH264()) {
    return false;
  }

  // Disable 4k video on windows vista since it performs poorly.
  if (!IsWin7OrLater() &&
      level >= H264_LEVEL_5) {
    return false;
  }
#endif

  // Just assume what we can play on all platforms the codecs/formats that
  // WMF can play, since we don't have documentation about what other
  // platforms can play... According to the WMF documentation:
  // http://msdn.microsoft.com/en-us/library/windows/desktop/dd797815%28v=vs.85%29.aspx
  // "The Media Foundation H.264 video decoder is a Media Foundation Transform
  // that supports decoding of Baseline, Main, and High profiles, up to level
  // 5.1.". We also report that we can play Extended profile, as there are
  // bitstreams that are Extended compliant that are also Baseline compliant.
  return level >= H264_LEVEL_1 &&
         level <= H264_LEVEL_5_1 &&
         (profile == H264_PROFILE_BASE ||
          profile == H264_PROFILE_MAIN ||
          profile == H264_PROFILE_EXTENDED ||
          profile == H264_PROFILE_HIGH);
}

/* static */
bool
MP4Decoder::CanHandleMediaType(const nsACString& aType,
                               const nsAString& aCodecs,
                               bool& aOutContainsAAC,
                               bool& aOutContainsH264,
                               bool& aOutContainsMP3)
{
  if (!IsEnabled()) {
    return false;
  }

  if (aType.EqualsASCII("audio/mp4") || aType.EqualsASCII("audio/x-m4a")) {
    return aCodecs.IsEmpty() ||
           IsSupportedAudioCodec(aCodecs,
                                 aOutContainsAAC,
                                 aOutContainsMP3);
  }

  if (!aType.EqualsASCII("video/mp4")) {
    return false;
  }

  // Verify that all the codecs specifed are ones that we expect that
  // we can play.
  nsCharSeparatedTokenizer tokenizer(aCodecs, ',');
  bool expectMoreTokens = false;
  while (tokenizer.hasMoreTokens()) {
    const nsSubstring& token = tokenizer.nextToken();
    expectMoreTokens = tokenizer.separatorAfterCurrentToken();
    if (IsSupportedAudioCodec(token,
                              aOutContainsAAC,
                              aOutContainsMP3)) {
      continue;
    }
    if (IsSupportedH264Codec(token)) {
      aOutContainsH264 = true;
      continue;
    }
    return false;
  }
  if (expectMoreTokens) {
    // Last codec name was empty
    return false;
  }

  return true;
}

static bool
IsFFmpegAvailable()
{
#ifndef MOZ_FFMPEG
  return false;
#else
  return Preferences::GetBool("media.fragmented-mp4.ffmpeg.enabled", false);
#endif
}

static bool
IsAppleAvailable()
{
#ifndef MOZ_APPLEMEDIA
  // Not the right platform.
  return false;
#else
  return Preferences::GetBool("media.apple.mp4.enabled", false);
#endif
}

static bool
IsAndroidAvailable()
{
#ifndef MOZ_WIDGET_ANDROID
  return false;
#else
  // We need android.media.MediaCodec which exists in API level 16 and higher.
  return AndroidBridge::Bridge()->GetAPIVersion() >= 16;
#endif
}

static bool
IsGonkMP4DecoderAvailable()
{
  return Preferences::GetBool("media.fragmented-mp4.gonk.enabled", false);
}

static bool
IsGMPDecoderAvailable()
{
  return Preferences::GetBool("media.fragmented-mp4.gmp.enabled", false);
}

static bool
HavePlatformMPEGDecoders()
{
  return Preferences::GetBool("media.fragmented-mp4.use-blank-decoder") ||
#ifdef XP_WIN
         // We have H.264/AAC platform decoders on Windows Vista and up.
         IsVistaOrLater() ||
#endif
         IsAndroidAvailable() ||
         IsFFmpegAvailable() ||
         IsAppleAvailable() ||
         IsGonkMP4DecoderAvailable() ||
         IsGMPDecoderAvailable() ||
         // TODO: Other platforms...
         false;
}

/* static */
bool
MP4Decoder::IsEnabled()
{
  return Preferences::GetBool("media.fragmented-mp4.enabled") &&
         HavePlatformMPEGDecoders();
}

} // namespace mozilla