1 files changed, 60 insertions, 0 deletions
diff --git a/webrtc/modules/audio_conference_mixer/include/audio_conference_mixer_defines.h b/webrtc/modules/audio_conference_mixer/include/audio_conference_mixer_defines.h
new file mode 100644
index 0000000000..5d58f42435
--- /dev/null
+++ b/webrtc/modules/audio_conference_mixer/include/audio_conference_mixer_defines.h
@@ -0,0 +1,60 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_MODULES_AUDIO_CONFERENCE_MIXER_INCLUDE_AUDIO_CONFERENCE_MIXER_DEFINES_H_
+#define WEBRTC_MODULES_AUDIO_CONFERENCE_MIXER_INCLUDE_AUDIO_CONFERENCE_MIXER_DEFINES_H_
+
+#include "webrtc/modules/include/module_common_types.h"
+#include "webrtc/typedefs.h"
+
+namespace webrtc {
+class MixHistory;
+
+// A callback class that all mixer participants must inherit from/implement.
+class MixerParticipant
+{
+public:
+    // The implementation of this function should update audioFrame with new
+    // audio every time it's called.
+    //
+    // If it returns -1, the frame will not be added to the mix.
+    virtual int32_t GetAudioFrame(int32_t id,
+                                  AudioFrame* audioFrame) = 0;
+
+    // Returns true if the participant was mixed this mix iteration.
+    bool IsMixed() const;
+
+    // This function specifies the sampling frequency needed for the AudioFrame
+    // for future GetAudioFrame(..) calls.
+    virtual int32_t NeededFrequency(int32_t id) const = 0;
+
+    MixHistory* _mixHistory;
+protected:
+    MixerParticipant();
+    virtual ~MixerParticipant();
+};
+
+class AudioMixerOutputReceiver
+{
+public:
+    // This callback function provides the mixed audio for this mix iteration.
+    // Note that uniqueAudioFrames is an array of AudioFrame pointers with the
+    // size according to the size parameter.
+    virtual void NewMixedAudio(const int32_t id,
+                               const AudioFrame& generalAudioFrame,
+                               const AudioFrame** uniqueAudioFrames,
+                               const uint32_t size) = 0;
+protected:
+    AudioMixerOutputReceiver() {}
+    virtual ~AudioMixerOutputReceiver() {}
+};
+}  // namespace webrtc
+
+#endif // WEBRTC_MODULES_AUDIO_CONFERENCE_MIXER_INCLUDE_AUDIO_CONFERENCE_MIXER_DEFINES_H_