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      1 /*
      2  * libjingle
      3  * Copyright 2004 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_BASE_FAKEVIDEOCAPTURER_H_
     29 #define TALK_MEDIA_BASE_FAKEVIDEOCAPTURER_H_
     30 
     31 #include <string.h>
     32 
     33 #include <vector>
     34 
     35 #include "talk/media/base/videocapturer.h"
     36 #include "talk/media/base/videocommon.h"
     37 #include "talk/media/base/videoframe.h"
     38 #include "webrtc/base/timeutils.h"
     39 #ifdef HAVE_WEBRTC_VIDEO
     40 #include "talk/media/webrtc/webrtcvideoframefactory.h"
     41 #endif
     42 
     43 namespace cricket {
     44 
     45 // Fake video capturer that allows the test to manually pump in frames.
     46 class FakeVideoCapturer : public cricket::VideoCapturer {
     47  public:
     48   FakeVideoCapturer()
     49       : running_(false),
     50         initial_unix_timestamp_(time(NULL) * rtc::kNumNanosecsPerSec),
     51         next_timestamp_(rtc::kNumNanosecsPerMillisec),
     52         is_screencast_(false),
     53         rotation_(webrtc::kVideoRotation_0) {
     54 #ifdef HAVE_WEBRTC_VIDEO
     55     set_frame_factory(new cricket::WebRtcVideoFrameFactory());
     56 #endif
     57     // Default supported formats. Use ResetSupportedFormats to over write.
     58     std::vector<cricket::VideoFormat> formats;
     59     formats.push_back(cricket::VideoFormat(1280, 720,
     60         cricket::VideoFormat::FpsToInterval(30), cricket::FOURCC_I420));
     61     formats.push_back(cricket::VideoFormat(640, 480,
     62         cricket::VideoFormat::FpsToInterval(30), cricket::FOURCC_I420));
     63     formats.push_back(cricket::VideoFormat(320, 240,
     64         cricket::VideoFormat::FpsToInterval(30), cricket::FOURCC_I420));
     65     formats.push_back(cricket::VideoFormat(160, 120,
     66         cricket::VideoFormat::FpsToInterval(30), cricket::FOURCC_I420));
     67     formats.push_back(cricket::VideoFormat(1280, 720,
     68         cricket::VideoFormat::FpsToInterval(60), cricket::FOURCC_I420));
     69     ResetSupportedFormats(formats);
     70   }
     71   ~FakeVideoCapturer() {
     72     SignalDestroyed(this);
     73   }
     74 
     75   void ResetSupportedFormats(const std::vector<cricket::VideoFormat>& formats) {
     76     SetSupportedFormats(formats);
     77   }
     78   bool CaptureFrame() {
     79     if (!GetCaptureFormat()) {
     80       return false;
     81     }
     82     return CaptureCustomFrame(GetCaptureFormat()->width,
     83                               GetCaptureFormat()->height,
     84                               GetCaptureFormat()->interval,
     85                               GetCaptureFormat()->fourcc);
     86   }
     87   bool CaptureCustomFrame(int width, int height, uint32_t fourcc) {
     88     // default to 30fps
     89     return CaptureCustomFrame(width, height, 33333333, fourcc);
     90   }
     91   bool CaptureCustomFrame(int width,
     92                           int height,
     93                           int64_t timestamp_interval,
     94                           uint32_t fourcc) {
     95     if (!running_) {
     96       return false;
     97     }
     98     // Currently, |fourcc| is always I420 or ARGB.
     99     // TODO(fbarchard): Extend SizeOf to take fourcc.
    100     uint32_t size = 0u;
    101     if (fourcc == cricket::FOURCC_ARGB) {
    102       size = width * 4 * height;
    103     } else if (fourcc == cricket::FOURCC_I420) {
    104       size = static_cast<uint32_t>(cricket::VideoFrame::SizeOf(width, height));
    105     } else {
    106       return false;  // Unsupported FOURCC.
    107     }
    108     if (size == 0u) {
    109       return false;  // Width and/or Height were zero.
    110     }
    111 
    112     cricket::CapturedFrame frame;
    113     frame.width = width;
    114     frame.height = height;
    115     frame.fourcc = fourcc;
    116     frame.data_size = size;
    117     frame.time_stamp = initial_unix_timestamp_ + next_timestamp_;
    118     next_timestamp_ += timestamp_interval;
    119 
    120     rtc::scoped_ptr<char[]> data(new char[size]);
    121     frame.data = data.get();
    122     // Copy something non-zero into the buffer so Validate wont complain that
    123     // the frame is all duplicate.
    124     memset(frame.data, 1, size / 2);
    125     memset(reinterpret_cast<uint8_t*>(frame.data) + (size / 2), 2,
    126            size - (size / 2));
    127     memcpy(frame.data, reinterpret_cast<const uint8_t*>(&fourcc), 4);
    128     frame.rotation = rotation_;
    129     // TODO(zhurunz): SignalFrameCaptured carry returned value to be able to
    130     // capture results from downstream.
    131     SignalFrameCaptured(this, &frame);
    132     return true;
    133   }
    134 
    135   void SignalCapturedFrame(cricket::CapturedFrame* frame) {
    136     SignalFrameCaptured(this, frame);
    137   }
    138 
    139   sigslot::signal1<FakeVideoCapturer*> SignalDestroyed;
    140 
    141   virtual cricket::CaptureState Start(const cricket::VideoFormat& format) {
    142     cricket::VideoFormat supported;
    143     if (GetBestCaptureFormat(format, &supported)) {
    144       SetCaptureFormat(&supported);
    145     }
    146     running_ = true;
    147     SetCaptureState(cricket::CS_RUNNING);
    148     return cricket::CS_RUNNING;
    149   }
    150   virtual void Stop() {
    151     running_ = false;
    152     SetCaptureFormat(NULL);
    153     SetCaptureState(cricket::CS_STOPPED);
    154   }
    155   virtual bool IsRunning() { return running_; }
    156   void SetScreencast(bool is_screencast) {
    157     is_screencast_ = is_screencast;
    158   }
    159   virtual bool IsScreencast() const { return is_screencast_; }
    160   bool GetPreferredFourccs(std::vector<uint32_t>* fourccs) {
    161     fourccs->push_back(cricket::FOURCC_I420);
    162     fourccs->push_back(cricket::FOURCC_MJPG);
    163     return true;
    164   }
    165 
    166   void SetRotation(webrtc::VideoRotation rotation) {
    167     rotation_ = rotation;
    168   }
    169 
    170   webrtc::VideoRotation GetRotation() { return rotation_; }
    171 
    172  private:
    173   bool running_;
    174   int64_t initial_unix_timestamp_;
    175   int64_t next_timestamp_;
    176   bool is_screencast_;
    177   webrtc::VideoRotation rotation_;
    178 };
    179 
    180 }  // namespace cricket
    181 
    182 #endif  // TALK_MEDIA_BASE_FAKEVIDEOCAPTURER_H_
    183