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 VPX_TEST_Y4M_VIDEO_SOURCE_H_
11 #define VPX_TEST_Y4M_VIDEO_SOURCE_H_
12 #include <algorithm>
13 #include <memory>
14 #include <string>
15 
16 #include "test/video_source.h"
17 #include "./y4minput.h"
18 
19 namespace libvpx_test {
20 
21 // This class extends VideoSource to allow parsing of raw yv12
22 // so that we can do actual file encodes.
23 class Y4mVideoSource : public VideoSource {
24  public:
Y4mVideoSource(const std::string & file_name,unsigned int start,int limit)25   Y4mVideoSource(const std::string &file_name, unsigned int start, int limit)
26       : file_name_(file_name), input_file_(NULL), img_(new vpx_image_t()),
27         start_(start), limit_(limit), frame_(0), framerate_numerator_(0),
28         framerate_denominator_(0), y4m_() {}
29 
~Y4mVideoSource()30   virtual ~Y4mVideoSource() {
31     vpx_img_free(img_.get());
32     CloseSource();
33   }
34 
OpenSource()35   virtual void OpenSource() {
36     CloseSource();
37     input_file_ = OpenTestDataFile(file_name_);
38     ASSERT_TRUE(input_file_ != NULL)
39         << "Input file open failed. Filename: " << file_name_;
40   }
41 
ReadSourceToStart()42   virtual void ReadSourceToStart() {
43     ASSERT_TRUE(input_file_ != NULL);
44     ASSERT_FALSE(y4m_input_open(&y4m_, input_file_, NULL, 0, 0));
45     framerate_numerator_ = y4m_.fps_n;
46     framerate_denominator_ = y4m_.fps_d;
47     frame_ = 0;
48     for (unsigned int i = 0; i < start_; i++) {
49       Next();
50     }
51     FillFrame();
52   }
53 
Begin()54   virtual void Begin() {
55     OpenSource();
56     ReadSourceToStart();
57   }
58 
Next()59   virtual void Next() {
60     ++frame_;
61     FillFrame();
62   }
63 
img()64   virtual vpx_image_t *img() const {
65     return (frame_ < limit_) ? img_.get() : NULL;
66   }
67 
68   // Models a stream where Timebase = 1/FPS, so pts == frame.
pts()69   virtual vpx_codec_pts_t pts() const { return frame_; }
70 
duration()71   virtual unsigned long duration() const { return 1; }
72 
timebase()73   virtual vpx_rational_t timebase() const {
74     const vpx_rational_t t = { framerate_denominator_, framerate_numerator_ };
75     return t;
76   }
77 
frame()78   virtual unsigned int frame() const { return frame_; }
79 
limit()80   virtual unsigned int limit() const { return limit_; }
81 
FillFrame()82   virtual void FillFrame() {
83     ASSERT_TRUE(input_file_ != NULL);
84     // Read a frame from input_file.
85     y4m_input_fetch_frame(&y4m_, input_file_, img_.get());
86   }
87 
88   // Swap buffers with another y4m source. This allows reading a new frame
89   // while keeping the old frame around. A whole Y4mSource is required and
90   // not just a vpx_image_t because of how the y4m reader manipulates
91   // vpx_image_t internals,
SwapBuffers(Y4mVideoSource * other)92   void SwapBuffers(Y4mVideoSource *other) {
93     std::swap(other->y4m_.dst_buf, y4m_.dst_buf);
94     vpx_image_t *tmp;
95     tmp = other->img_.release();
96     other->img_.reset(img_.release());
97     img_.reset(tmp);
98   }
99 
100  protected:
CloseSource()101   void CloseSource() {
102     y4m_input_close(&y4m_);
103     y4m_ = y4m_input();
104     if (input_file_ != NULL) {
105       fclose(input_file_);
106       input_file_ = NULL;
107     }
108   }
109 
110   std::string file_name_;
111   FILE *input_file_;
112   std::unique_ptr<vpx_image_t> img_;
113   unsigned int start_;
114   unsigned int limit_;
115   unsigned int frame_;
116   int framerate_numerator_;
117   int framerate_denominator_;
118   y4m_input y4m_;
119 };
120 
121 }  // namespace libvpx_test
122 
123 #endif  // VPX_TEST_Y4M_VIDEO_SOURCE_H_
124