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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/base/timeutils.h"
     36 #include "talk/media/base/videocapturer.h"
     37 #include "talk/media/base/videocommon.h"
     38 #include "talk/media/base/videoframe.h"
     39 
     40 namespace cricket {
     41 
     42 // Fake video capturer that allows the test to manually pump in frames.
     43 class FakeVideoCapturer : public cricket::VideoCapturer {
     44  public:
     45   FakeVideoCapturer()
     46       : running_(false),
     47         initial_unix_timestamp_(time(NULL) * talk_base::kNumNanosecsPerSec),
     48         next_timestamp_(talk_base::kNumNanosecsPerMillisec),
     49         is_screencast_(false) {
     50     // Default supported formats. Use ResetSupportedFormats to over write.
     51     std::vector<cricket::VideoFormat> formats;
     52     formats.push_back(cricket::VideoFormat(1280, 720,
     53         cricket::VideoFormat::FpsToInterval(30), cricket::FOURCC_I420));
     54     formats.push_back(cricket::VideoFormat(640, 480,
     55         cricket::VideoFormat::FpsToInterval(30), cricket::FOURCC_I420));
     56     formats.push_back(cricket::VideoFormat(320, 240,
     57         cricket::VideoFormat::FpsToInterval(30), cricket::FOURCC_I420));
     58     formats.push_back(cricket::VideoFormat(160, 120,
     59         cricket::VideoFormat::FpsToInterval(30), cricket::FOURCC_I420));
     60     ResetSupportedFormats(formats);
     61   }
     62   ~FakeVideoCapturer() {
     63     SignalDestroyed(this);
     64   }
     65 
     66   void ResetSupportedFormats(const std::vector<cricket::VideoFormat>& formats) {
     67     SetSupportedFormats(formats);
     68   }
     69   bool CaptureFrame() {
     70     if (!GetCaptureFormat()) {
     71       return false;
     72     }
     73     return CaptureCustomFrame(GetCaptureFormat()->width,
     74                               GetCaptureFormat()->height,
     75                               GetCaptureFormat()->fourcc);
     76   }
     77   bool CaptureCustomFrame(int width, int height, uint32 fourcc) {
     78     if (!running_) {
     79       return false;
     80     }
     81     // Currently, |fourcc| is always I420 or ARGB.
     82     // TODO(fbarchard): Extend SizeOf to take fourcc.
     83     uint32 size = 0u;
     84     if (fourcc == cricket::FOURCC_ARGB) {
     85       size = width * 4 * height;
     86     } else if (fourcc == cricket::FOURCC_I420) {
     87       size = static_cast<uint32>(cricket::VideoFrame::SizeOf(width, height));
     88     } else {
     89       return false;  // Unsupported FOURCC.
     90     }
     91     if (size == 0u) {
     92       return false;  // Width and/or Height were zero.
     93     }
     94 
     95     cricket::CapturedFrame frame;
     96     frame.width = width;
     97     frame.height = height;
     98     frame.fourcc = fourcc;
     99     frame.data_size = size;
    100     frame.elapsed_time = next_timestamp_;
    101     frame.time_stamp = initial_unix_timestamp_ + next_timestamp_;
    102     next_timestamp_ += 33333333;  // 30 fps
    103 
    104     talk_base::scoped_array<char> data(new char[size]);
    105     frame.data = data.get();
    106     // Copy something non-zero into the buffer so Validate wont complain that
    107     // the frame is all duplicate.
    108     memset(frame.data, 1, size / 2);
    109     memset(reinterpret_cast<uint8*>(frame.data) + (size / 2), 2,
    110          size - (size / 2));
    111     memcpy(frame.data, reinterpret_cast<const uint8*>(&fourcc), 4);
    112     // TODO(zhurunz): SignalFrameCaptured carry returned value to be able to
    113     // capture results from downstream.
    114     SignalFrameCaptured(this, &frame);
    115     return true;
    116   }
    117 
    118   sigslot::signal1<FakeVideoCapturer*> SignalDestroyed;
    119 
    120   virtual cricket::CaptureState Start(const cricket::VideoFormat& format) {
    121     cricket::VideoFormat supported;
    122     if (GetBestCaptureFormat(format, &supported)) {
    123       SetCaptureFormat(&supported);
    124     }
    125     running_ = true;
    126     SetCaptureState(cricket::CS_RUNNING);
    127     return cricket::CS_RUNNING;
    128   }
    129   virtual void Stop() {
    130     running_ = false;
    131     SetCaptureFormat(NULL);
    132     SetCaptureState(cricket::CS_STOPPED);
    133   }
    134   virtual bool IsRunning() { return running_; }
    135   void SetScreencast(bool is_screencast) {
    136     is_screencast_ = is_screencast;
    137   }
    138   virtual bool IsScreencast() const { return is_screencast_; }
    139   bool GetPreferredFourccs(std::vector<uint32>* fourccs) {
    140     fourccs->push_back(cricket::FOURCC_I420);
    141     fourccs->push_back(cricket::FOURCC_MJPG);
    142     return true;
    143   }
    144 
    145  private:
    146   bool running_;
    147   int64 initial_unix_timestamp_;
    148   int64 next_timestamp_;
    149   bool is_screencast_;
    150 };
    151 
    152 }  // namespace cricket
    153 
    154 #endif  // TALK_MEDIA_BASE_FAKEVIDEOCAPTURER_H_
    155