1/*
2 * libjingle
3 * Copyright 2013, Google Inc.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 *  1. Redistributions of source code must retain the above copyright notice,
9 *     this list of conditions and the following disclaimer.
10 *  2. Redistributions in binary form must reproduce the above copyright notice,
11 *     this list of conditions and the following disclaimer in the documentation
12 *     and/or other materials provided with the distribution.
13 *  3. The name of the author may not be used to endorse or promote products
14 *     derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
18 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
19 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
20 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28#ifndef TALK_MEDIA_WEBRTC_WEBRTCVIDEOENCODERFACTORY_H_
29#define TALK_MEDIA_WEBRTC_WEBRTCVIDEOENCODERFACTORY_H_
30
31#include "talk/media/base/codec.h"
32#include "webrtc/base/refcount.h"
33#include "webrtc/common_types.h"
34
35namespace webrtc {
36class VideoEncoder;
37}
38
39namespace cricket {
40
41class WebRtcVideoEncoderFactory {
42 public:
43  struct VideoCodec {
44    webrtc::VideoCodecType type;
45    std::string name;
46    int max_width;
47    int max_height;
48    int max_fps;
49
50    VideoCodec(webrtc::VideoCodecType t, const std::string& nm, int w, int h,
51               int fr)
52        : type(t), name(nm), max_width(w), max_height(h), max_fps(fr) {
53    }
54  };
55
56  class Observer {
57   public:
58    // Invoked when the list of supported codecs becomes available.
59    // This will not be invoked if the list of codecs is already available when
60    // the factory is installed. Otherwise this will be invoked only once if the
61    // list of codecs is not yet available when the factory is installed.
62    virtual void OnCodecsAvailable() = 0;
63
64   protected:
65    virtual ~Observer() {}
66  };
67
68  // Caller takes the ownership of the returned object and it should be released
69  // by calling DestroyVideoEncoder().
70  virtual webrtc::VideoEncoder* CreateVideoEncoder(
71      webrtc::VideoCodecType type) = 0;
72  virtual ~WebRtcVideoEncoderFactory() {}
73
74  // Adds/removes observer to receive OnCodecsChanged notifications.
75  // Factory must outlive Observer. Observer is responsible for removing itself
76  // from the Factory by the time its dtor is done.
77  virtual void AddObserver(Observer* observer) = 0;
78  virtual void RemoveObserver(Observer* observer) = 0;
79
80  // Returns a list of supported codecs in order of preference.
81  // The list is empty if the list of codecs is not yet available.
82  virtual const std::vector<VideoCodec>& codecs() const = 0;
83
84  virtual void DestroyVideoEncoder(webrtc::VideoEncoder* encoder) = 0;
85};
86
87}  // namespace cricket
88
89#endif  // TALK_MEDIA_WEBRTC_WEBRTCVIDEOENCODERFACTORY_H_
90