Re-implement audio capturing based on the AudioService API (fixes issue #2755)

include/internal/cef_types.h

@@ -3003,6 +3003,137 @@ typedef struct _cef_composition_underline_t {
   cef_composition_underline_style_t style;
 } cef_composition_underline_t;
 
+///
+// Enumerates the various representations of the ordering of audio channels.
+// Must be kept synchronized with media::ChannelLayout from Chromium.
+// See media\base\channel_layout.h
+///
+typedef enum {
+  CEF_CHANNEL_LAYOUT_NONE = 0,
+  CEF_CHANNEL_LAYOUT_UNSUPPORTED = 1,
+
+  // Front C
+  CEF_CHANNEL_LAYOUT_MONO = 2,
+
+  // Front L, Front R
+  CEF_CHANNEL_LAYOUT_STEREO = 3,
+
+  // Front L, Front R, Back C
+  CEF_CHANNEL_LAYOUT_2_1 = 4,
+
+  // Front L, Front R, Front C
+  CEF_CHANNEL_LAYOUT_SURROUND = 5,
+
+  // Front L, Front R, Front C, Back C
+  CEF_CHANNEL_LAYOUT_4_0 = 6,
+
+  // Front L, Front R, Side L, Side R
+  CEF_CHANNEL_LAYOUT_2_2 = 7,
+
+  // Front L, Front R, Back L, Back R
+  CEF_CHANNEL_LAYOUT_QUAD = 8,
+
+  // Front L, Front R, Front C, Side L, Side R
+  CEF_CHANNEL_LAYOUT_5_0 = 9,
+
+  // Front L, Front R, Front C, LFE, Side L, Side R
+  CEF_CHANNEL_LAYOUT_5_1 = 10,
+
+  // Front L, Front R, Front C, Back L, Back R
+  CEF_CHANNEL_LAYOUT_5_0_BACK = 11,
+
+  // Front L, Front R, Front C, LFE, Back L, Back R
+  CEF_CHANNEL_LAYOUT_5_1_BACK = 12,
+
+  // Front L, Front R, Front C, Side L, Side R, Back L, Back R
+  CEF_CHANNEL_LAYOUT_7_0 = 13,
+
+  // Front L, Front R, Front C, LFE, Side L, Side R, Back L, Back R
+  CEF_CHANNEL_LAYOUT_7_1 = 14,
+
+  // Front L, Front R, Front C, LFE, Side L, Side R, Front LofC, Front RofC
+  CEF_CHANNEL_LAYOUT_7_1_WIDE = 15,
+
+  // Stereo L, Stereo R
+  CEF_CHANNEL_LAYOUT_STEREO_DOWNMIX = 16,
+
+  // Stereo L, Stereo R, LFE
+  CEF_CHANNEL_LAYOUT_2POINT1 = 17,
+
+  // Stereo L, Stereo R, Front C, LFE
+  CEF_CHANNEL_LAYOUT_3_1 = 18,
+
+  // Stereo L, Stereo R, Front C, Rear C, LFE
+  CEF_CHANNEL_LAYOUT_4_1 = 19,
+
+  // Stereo L, Stereo R, Front C, Side L, Side R, Back C
+  CEF_CHANNEL_LAYOUT_6_0 = 20,
+
+  // Stereo L, Stereo R, Side L, Side R, Front LofC, Front RofC
+  CEF_CHANNEL_LAYOUT_6_0_FRONT = 21,
+
+  // Stereo L, Stereo R, Front C, Rear L, Rear R, Rear C
+  CEF_CHANNEL_LAYOUT_HEXAGONAL = 22,
+
+  // Stereo L, Stereo R, Front C, LFE, Side L, Side R, Rear Center
+  CEF_CHANNEL_LAYOUT_6_1 = 23,
+
+  // Stereo L, Stereo R, Front C, LFE, Back L, Back R, Rear Center
+  CEF_CHANNEL_LAYOUT_6_1_BACK = 24,
+
+  // Stereo L, Stereo R, Side L, Side R, Front LofC, Front RofC, LFE
+  CEF_CHANNEL_LAYOUT_6_1_FRONT = 25,
+
+  // Front L, Front R, Front C, Side L, Side R, Front LofC, Front RofC
+  CEF_CHANNEL_LAYOUT_7_0_FRONT = 26,
+
+  // Front L, Front R, Front C, LFE, Back L, Back R, Front LofC, Front RofC
+  CEF_CHANNEL_LAYOUT_7_1_WIDE_BACK = 27,
+
+  // Front L, Front R, Front C, Side L, Side R, Rear L, Back R, Back C.
+  CEF_CHANNEL_LAYOUT_OCTAGONAL = 28,
+
+  // Channels are not explicitly mapped to speakers.
+  CEF_CHANNEL_LAYOUT_DISCRETE = 29,
+
+  // Front L, Front R, Front C. Front C contains the keyboard mic audio. This
+  // layout is only intended for input for WebRTC. The Front C channel
+  // is stripped away in the WebRTC audio input pipeline and never seen outside
+  // of that.
+  CEF_CHANNEL_LAYOUT_STEREO_AND_KEYBOARD_MIC = 30,
+
+  // Front L, Front R, Side L, Side R, LFE
+  CEF_CHANNEL_LAYOUT_4_1_QUAD_SIDE = 31,
+
+  // Actual channel layout is specified in the bitstream and the actual channel
+  // count is unknown at Chromium media pipeline level (useful for audio
+  // pass-through mode).
+  CEF_CHANNEL_LAYOUT_BITSTREAM = 32,
+
+  // Max value, must always equal the largest entry ever logged.
+  CEF_CHANNEL_LAYOUT_MAX = CEF_CHANNEL_LAYOUT_BITSTREAM
+} cef_channel_layout_t;
+
+///
+// Structure representing the audio parameters for setting up the audio handler.
+///
+typedef struct _cef_audio_parameters_t {
+  ///
+  // Layout of the audio channels
+  ///
+  cef_channel_layout_t channel_layout;
+
+  ///
+  // Sample rate
+  //
+  int sample_rate;
+
+  ///
+  // Number of frames per buffer
+  ///
+  int frames_per_buffer;
+} cef_audio_parameters_t;
+
 ///
 // Result codes for CefMediaRouter::CreateRoute. Should be kept in sync with
 // Chromium's media_router::RouteRequestResult::ResultCode type.

include/internal/cef_types_wrappers.h

@@ -960,4 +960,23 @@ struct CefCompositionUnderlineTraits {
 ///
 typedef CefStructBase<CefCompositionUnderlineTraits> CefCompositionUnderline;
 
+struct CefAudioParametersTraits {
+  typedef cef_audio_parameters_t struct_type;
+
+  static inline void init(struct_type* s) {}
+
+  static inline void clear(struct_type* s) {}
+
+  static inline void set(const struct_type* src,
+                         struct_type* target,
+                         bool copy) {
+    *target = *src;
+  }
+};
+
+///
+// Class representing CefAudioParameters settings
+///
+typedef CefStructBase<CefAudioParametersTraits> CefAudioParameters;
+
 #endif  // CEF_INCLUDE_INTERNAL_CEF_TYPES_WRAPPERS_H_