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/*
* libjingle
* Copyright 2004--2005, Google Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
// MediaEngine is an abstraction of a media engine which can be subclassed
// to support different media componentry backends.
#ifndef TALK_SESSION_PHONE_MEDIAENGINE_H_
#define TALK_SESSION_PHONE_MEDIAENGINE_H_
#include <string>
#include <vector>
#include "mediachannel.h"
namespace cricket {
class MediaEngine {
public:
struct Codec {
int id;
std::string name;
int preference;
// Creates a codec with the given parameters.
Codec(int pt, const std::string& nm, int pr) : id(pt), name(nm), preference(pr) {}
// Ranks codecs by their preferences.
bool operator <(const Codec& c) const { return preference > c.preference; }
};
// Bittqmask flags for options that may be supported by the media engine implementation
enum MediaEngineOptions {
AUTO_GAIN_CONTROL = 1 << 1,
};
MediaEngine() {}
// Initialize
virtual bool Init() = 0;
virtual void Terminate() = 0;
virtual MediaChannel *CreateChannel() = 0;
virtual int SetAudioOptions(int options) = 0;
virtual int SetSoundDevices(int wave_in_device, int wave_out_device) = 0;
virtual int GetInputLevel() = 0;
std::vector<Codec> &codecs() { return codecs_; }
bool FindCodec(const char* codec) {
for (std::vector<Codec>::iterator i = codecs_.begin(); i < codecs_.end(); i++) {
if ((*i).name == codec)
return true;
}
return false;
}
bool GetCodecPreference (const char *codec, int & preference) {
for (std::vector<Codec>::iterator i = codecs_.begin(); i < codecs_.end(); i++) {
if ((*i).name == codec) {
preference = (*i).preference;
return true;
}
}
return false;
}
protected:
std::vector<Codec> codecs_;
};
} // namespace cricket
#endif // TALK_SESSION_PHONE_MEDIAENGINE_H_
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