video_source.h revision 1b362b15af34006e6a11974088a46d42b903418e 
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_VIDEO_SOURCE_H_
11#define TEST_VIDEO_SOURCE_H_
12
13#include <cstdio>
14#include <cstdlib>
15#include <string>
16#include "test/acm_random.h"
17#include "vpx/vpx_encoder.h"
18
19namespace libvpx_test {
20
21static FILE *OpenTestDataFile(const std::string& file_name) {
22  std::string path_to_source = file_name;
23  const char *kDataPath = getenv("LIBVPX_TEST_DATA_PATH");
24
25  if (kDataPath) {
26    path_to_source = kDataPath;
27    path_to_source += "/";
28    path_to_source += file_name;
29  }
30
31  return fopen(path_to_source.c_str(), "rb");
32}
33
34// Abstract base class for test video sources, which provide a stream of
35// vpx_image_t images with associated timestamps and duration.
36class VideoSource {
37 public:
38  virtual ~VideoSource() {}
39
40  // Prepare the stream for reading, rewind/open as necessary.
41  virtual void Begin() = 0;
42
43  // Advance the cursor to the next frame
44  virtual void Next() = 0;
45
46  // Get the current video frame, or NULL on End-Of-Stream.
47  virtual vpx_image_t *img() const = 0;
48
49  // Get the presentation timestamp of the current frame.
50  virtual vpx_codec_pts_t pts() const = 0;
51
52  // Get the current frame's duration
53  virtual unsigned long duration() const = 0;
54
55  // Get the timebase for the stream
56  virtual vpx_rational_t timebase() const = 0;
57
58  // Get the current frame counter, starting at 0.
59  virtual unsigned int frame() const = 0;
60
61  // Get the current file limit.
62  virtual unsigned int limit() const = 0;
63};
64
65
66class DummyVideoSource : public VideoSource {
67 public:
68  DummyVideoSource() : img_(NULL), limit_(100), width_(0), height_(0) {
69    SetSize(80, 64);
70  }
71
72  virtual ~DummyVideoSource() { vpx_img_free(img_); }
73
74  virtual void Begin() {
75    frame_ = 0;
76    FillFrame();
77  }
78
79  virtual void Next() {
80    ++frame_;
81    FillFrame();
82  }
83
84  virtual vpx_image_t *img() const {
85    return (frame_ < limit_) ? img_ : NULL;
86  }
87
88  // Models a stream where Timebase = 1/FPS, so pts == frame.
89  virtual vpx_codec_pts_t pts() const { return frame_; }
90
91  virtual unsigned long duration() const { return 1; }
92
93  virtual vpx_rational_t timebase() const {
94    const vpx_rational_t t = {1, 30};
95    return t;
96  }
97
98  virtual unsigned int frame() const { return frame_; }
99
100  virtual unsigned int limit() const { return limit_; }
101
102  void SetSize(unsigned int width, unsigned int height) {
103    if (width != width_ || height != height_) {
104      vpx_img_free(img_);
105      raw_sz_ = ((width + 31)&~31) * height * 3 / 2;
106      img_ = vpx_img_alloc(NULL, VPX_IMG_FMT_VPXI420, width, height, 32);
107      width_ = width;
108      height_ = height;
109    }
110  }
111
112 protected:
113  virtual void FillFrame() { memset(img_->img_data, 0, raw_sz_); }
114
115  vpx_image_t *img_;
116  size_t       raw_sz_;
117  unsigned int limit_;
118  unsigned int frame_;
119  unsigned int width_;
120  unsigned int height_;
121};
122
123
124class RandomVideoSource : public DummyVideoSource {
125 public:
126  RandomVideoSource(int seed = ACMRandom::DeterministicSeed())
127      : rnd_(seed),
128        seed_(seed) { }
129
130 protected:
131  // Reset the RNG to get a matching stream for the second pass
132  virtual void Begin() {
133    frame_ = 0;
134    rnd_.Reset(seed_);
135    FillFrame();
136  }
137
138  // 15 frames of noise, followed by 15 static frames. Reset to 0 rather
139  // than holding previous frames to encourage keyframes to be thrown.
140  virtual void FillFrame() {
141    if (frame_ % 30 < 15)
142      for (size_t i = 0; i < raw_sz_; ++i)
143        img_->img_data[i] = rnd_.Rand8();
144    else
145      memset(img_->img_data, 0, raw_sz_);
146  }
147
148  ACMRandom rnd_;
149  int seed_;
150};
151
152// Abstract base class for test video sources, which provide a stream of
153// decompressed images to the decoder.
154class CompressedVideoSource {
155 public:
156  virtual ~CompressedVideoSource() {}
157
158  virtual void Init() = 0;
159
160  // Prepare the stream for reading, rewind/open as necessary.
161  virtual void Begin() = 0;
162
163  // Advance the cursor to the next frame
164  virtual void Next() = 0;
165
166  virtual const uint8_t *cxdata() const = 0;
167
168  virtual const unsigned int frame_size() const = 0;
169
170  virtual const unsigned int frame_number() const = 0;
171};
172
173}  // namespace libvpx_test
174
175#endif  // TEST_VIDEO_SOURCE_H_
176