test/y4m_video_source.h

   1 /*
   2  *  Copyright (c) 2012 The WebM project authors. All Rights Reserved.
   3  *
   4  *  Use of this source code is governed by a BSD-style license
   5  *  that can be found in the LICENSE file in the root of the source
   6  *  tree. An additional intellectual property rights grant can be found
   7  *  in the file PATENTS.  All contributing project authors may
   8  *  be found in the AUTHORS file in the root of the source tree.
   9  */
  10 #ifndef TEST_Y4M_VIDEO_SOURCE_H_
  11 #define TEST_Y4M_VIDEO_SOURCE_H_
  12 #include <algorithm>
  13 #include <string>
  14
  15 #include "test/video_source.h"
  16 #include "./y4minput.h"
  17
  18 namespace libvpx_test {
  19
  20 // This class extends VideoSource to allow parsing of raw yv12
  21 // so that we can do actual file encodes.
  22 class Y4mVideoSource : public VideoSource {
  23  public:
  24   Y4mVideoSource(const std::string &file_name,
  25                   unsigned int start, int limit)
  26       : file_name_(file_name),
  27         input_file_(NULL),
  28         img_(new vpx_image_t()),
  29         start_(start),
  30         limit_(limit),
  31         frame_(0),
  32         framerate_numerator_(0),
  33         framerate_denominator_(0),
  34         y4m_() {
  35   }
  36
  37   virtual ~Y4mVideoSource() {
  38     vpx_img_free(img_.get());
  39     CloseSource();
  40   }
  41
  42   virtual void OpenSource() {
  43     CloseSource();
  44     input_file_ = OpenTestDataFile(file_name_);
  45     ASSERT_TRUE(input_file_ != NULL) << "Input file open failed. Filename: "
  46                                      << file_name_;
  47   }
  48
  49   virtual void ReadSourceToStart() {
  50     ASSERT_TRUE(input_file_ != NULL);
  51     ASSERT_FALSE(y4m_input_open(&y4m_, input_file_, NULL, 0, 0));
  52     framerate_numerator_ = y4m_.fps_n;
  53     framerate_denominator_ = y4m_.fps_d;
  54     frame_ = 0;
  55     for (unsigned int i = 0; i < start_; i++) {
  56       Next();
  57     }
  58     FillFrame();
  59   }
  60
  61   virtual void Begin() {
  62     OpenSource();
  63     ReadSourceToStart();
  64   }
  65
  66   virtual void Next() {
  67     ++frame_;
  68     FillFrame();
  69   }
  70
  71   virtual vpx_image_t *img() const {
  72     return (frame_ < limit_) ? img_.get() : NULL;
  73   }
  74
  75   // Models a stream where Timebase = 1/FPS, so pts == frame.
  76   virtual vpx_codec_pts_t pts() const { return frame_; }
  77
  78   virtual unsigned long duration() const { return 1; }
  79
  80   virtual vpx_rational_t timebase() const {
  81     const vpx_rational_t t = { framerate_denominator_, framerate_numerator_ };
  82     return t;
  83   }
  84
  85   virtual unsigned int frame() const { return frame_; }
  86
  87   virtual unsigned int limit() const { return limit_; }
  88
  89   virtual void FillFrame() {
  90     ASSERT_TRUE(input_file_ != NULL);
  91     // Read a frame from input_file.
  92     y4m_input_fetch_frame(&y4m_, input_file_, img_.get());
  93   }
  94
  95   // Swap buffers with another y4m source. This allows reading a new frame
  96   // while keeping the old frame around. A whole Y4mSource is required and
  97   // not just a vpx_image_t because of how the y4m reader manipulates
  98   // vpx_image_t internals,
  99   void SwapBuffers(Y4mVideoSource *other) {
 100     std::swap(other->y4m_.dst_buf, y4m_.dst_buf);
 101     vpx_image_t *tmp;
 102     tmp = other->img_.release();
 103     other->img_.reset(img_.release());
 104     img_.reset(tmp);
 105   }
 106
 107  protected:
 108   void CloseSource() {
 109     y4m_input_close(&y4m_);
 110     y4m_ = y4m_input();
 111     if (input_file_ != NULL) {
 112       fclose(input_file_);
 113       input_file_ = NULL;
 114     }
 115   }
 116
 117   std::string file_name_;
 118   FILE *input_file_;
 119   testing::internal::scoped_ptr<vpx_image_t> img_;
 120   unsigned int start_;
 121   unsigned int limit_;
 122   unsigned int frame_;
 123   int framerate_numerator_;
 124   int framerate_denominator_;
 125   y4m_input y4m_;
 126 };
 127
 128 }  // namespace libvpx_test
 129
 130 #endif  // TEST_Y4M_VIDEO_SOURCE_H_