dom/media/CubebUtils.h

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim:set ts=2 sw=2 sts=2 et cindent: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #if !defined(CubebUtils_h_)
   8 #  define CubebUtils_h_
   9
  10 #  include "cubeb/cubeb.h"
  11
  12 #  include "AudioSampleFormat.h"
  13 #  include "nsString.h"
  14
  15 class AudioDeviceInfo;
  16
  17 MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS(cubeb_stream_prefs)
  18
  19 namespace mozilla {
  20
  21 class CallbackThreadRegistry;
  22
  23 namespace CubebUtils {
  24
  25 typedef cubeb_devid AudioDeviceID;
  26
  27 template <AudioSampleFormat N>
  28 struct ToCubebFormat {
  29   static const cubeb_sample_format value = CUBEB_SAMPLE_FLOAT32NE;
  30 };
  31
  32 template <>
  33 struct ToCubebFormat<AUDIO_FORMAT_S16> {
  34   static const cubeb_sample_format value = CUBEB_SAMPLE_S16NE;
  35 };
  36
  37 // Initialize Audio Library. Some Audio backends require initializing the
  38 // library before using it.
  39 void InitLibrary();
  40
  41 // Shutdown Audio Library. Some Audio backends require shutting down the
  42 // library after using it.
  43 void ShutdownLibrary();
  44
  45 bool SandboxEnabled();
  46
  47 // Returns the maximum number of channels supported by the audio hardware.
  48 uint32_t MaxNumberOfChannels();
  49
  50 // Get the sample rate the hardware/mixer runs at. Thread safe.
  51 uint32_t PreferredSampleRate(bool aShouldResistFingerprinting);
  52
  53 // Initialize a cubeb stream. A pass through wrapper for cubeb_stream_init,
  54 // that can simulate streams that are very slow to start, by setting the pref
  55 // media.cubeb.slow_stream_init_ms.
  56 int CubebStreamInit(cubeb* context, cubeb_stream** stream,
  57                     char const* stream_name, cubeb_devid input_device,
  58                     cubeb_stream_params* input_stream_params,
  59                     cubeb_devid output_device,
  60                     cubeb_stream_params* output_stream_params,
  61                     uint32_t latency_frames, cubeb_data_callback data_callback,
  62                     cubeb_state_callback state_callback, void* user_ptr);
  63
  64 enum Side { Input, Output };
  65
  66 double GetVolumeScale();
  67 bool GetFirstStream();
  68 cubeb* GetCubebContext();
  69 void ReportCubebStreamInitFailure(bool aIsFirstStream);
  70 void ReportCubebBackendUsed();
  71 uint32_t GetCubebPlaybackLatencyInMilliseconds();
  72 uint32_t GetCubebMTGLatencyInFrames(cubeb_stream_params* params);
  73 bool CubebLatencyPrefSet();
  74 void GetCurrentBackend(nsAString& aBackend);
  75 cubeb_stream_prefs GetDefaultStreamPrefs(cubeb_device_type aType);
  76 char* GetForcedOutputDevice();
  77 // No-op on all platforms but Android, where it tells the device's AudioManager
  78 // to switch to "communication mode", which might change audio routing,
  79 // bluetooth communication type, etc.
  80 void SetInCommunication(bool aInCommunication);
  81 // Returns true if the output streams should be routed like a stream containing
  82 // voice data, and not generic audio. This can influence audio processing and
  83 // device selection.
  84 bool RouteOutputAsVoice();
  85 // Returns, in seconds, the roundtrip latency Gecko thinks there is between the
  86 // default input and output devices. This is for diagnosing purposes, the
  87 // latency figures are best used directly from the cubeb streams themselves, as
  88 // the devices being used matter. This is blocking.
  89 bool EstimatedRoundTripLatencyDefaultDevices(double* aMean, double* aStdDev);
  90
  91 #  ifdef MOZ_WIDGET_ANDROID
  92 int32_t AndroidGetAudioOutputSampleRate();
  93 int32_t AndroidGetAudioOutputFramesPerBuffer();
  94 #  endif
  95
  96 #  ifdef ENABLE_SET_CUBEB_BACKEND
  97 void ForceSetCubebContext(cubeb* aCubebContext);
  98 #  endif
  99 }  // namespace CubebUtils
 100 }  // namespace mozilla
 101
 102 #endif  // CubebUtils_h_