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/*
* Copyright (c) 2012 The WebM project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef TEST_VIDEO_SOURCE_H_
#define TEST_VIDEO_SOURCE_H_
#include <cstdio>
#include <cstdlib>
#include <string>
#include "test/acm_random.h"
#include "vpx/vpx_encoder.h"
namespace libvpx_test {
// Helper macros to ensure LIBVPX_TEST_DATA_PATH is a quoted string.
// These are undefined right below GetDataPath
// NOTE: LIBVPX_TEST_DATA_PATH MUST NOT be a quoted string before
// Stringification or the GetDataPath will fail at runtime
#define TO_STRING(S) #S
#define STRINGIFY(S) TO_STRING(S)
// A simple function to encapsulate cross platform retrieval of test data path
static std::string GetDataPath() {
const char *const data_path = getenv("LIBVPX_TEST_DATA_PATH");
if (data_path == NULL) {
#ifdef LIBVPX_TEST_DATA_PATH
// In some environments, we cannot set environment variables
// Instead, we set the data path by using a preprocessor symbol
// which can be set from make files
return STRINGIFY(LIBVPX_TEST_DATA_PATH);
#else
return ".";
#endif
}
return data_path;
}
// Undefining stringification macros because they are not used elsewhere
#undef TO_STRING
#undef STRINGIFY
static FILE *OpenTestDataFile(const std::string& file_name) {
const std::string path_to_source = GetDataPath() + "/" + file_name;
return fopen(path_to_source.c_str(), "rb");
}
// Abstract base class for test video sources, which provide a stream of
// vpx_image_t images with associated timestamps and duration.
class VideoSource {
public:
virtual ~VideoSource() {}
// Prepare the stream for reading, rewind/open as necessary.
virtual void Begin() = 0;
// Advance the cursor to the next frame
virtual void Next() = 0;
// Get the current video frame, or NULL on End-Of-Stream.
virtual vpx_image_t *img() const = 0;
// Get the presentation timestamp of the current frame.
virtual vpx_codec_pts_t pts() const = 0;
// Get the current frame's duration
virtual unsigned long duration() const = 0;
// Get the timebase for the stream
virtual vpx_rational_t timebase() const = 0;
// Get the current frame counter, starting at 0.
virtual unsigned int frame() const = 0;
// Get the current file limit.
virtual unsigned int limit() const = 0;
};
class DummyVideoSource : public VideoSource {
public:
DummyVideoSource() : img_(NULL), limit_(100), width_(0), height_(0) {
SetSize(80, 64);
}
virtual ~DummyVideoSource() { vpx_img_free(img_); }
virtual void Begin() {
frame_ = 0;
FillFrame();
}
virtual void Next() {
++frame_;
FillFrame();
}
virtual vpx_image_t *img() const {
return (frame_ < limit_) ? img_ : NULL;
}
// Models a stream where Timebase = 1/FPS, so pts == frame.
virtual vpx_codec_pts_t pts() const { return frame_; }
virtual unsigned long duration() const { return 1; }
virtual vpx_rational_t timebase() const {
const vpx_rational_t t = {1, 30};
return t;
}
virtual unsigned int frame() const { return frame_; }
virtual unsigned int limit() const { return limit_; }
void SetSize(unsigned int width, unsigned int height) {
if (width != width_ || height != height_) {
vpx_img_free(img_);
raw_sz_ = ((width + 31)&~31) * height * 3 / 2;
img_ = vpx_img_alloc(NULL, VPX_IMG_FMT_I420, width, height, 32);
width_ = width;
height_ = height;
}
}
protected:
virtual void FillFrame() { memset(img_->img_data, 0, raw_sz_); }
vpx_image_t *img_;
size_t raw_sz_;
unsigned int limit_;
unsigned int frame_;
unsigned int width_;
unsigned int height_;
};
class RandomVideoSource : public DummyVideoSource {
public:
RandomVideoSource(int seed = ACMRandom::DeterministicSeed())
: rnd_(seed),
seed_(seed) { }
protected:
// Reset the RNG to get a matching stream for the second pass
virtual void Begin() {
frame_ = 0;
rnd_.Reset(seed_);
FillFrame();
}
// 15 frames of noise, followed by 15 static frames. Reset to 0 rather
// than holding previous frames to encourage keyframes to be thrown.
virtual void FillFrame() {
if (frame_ % 30 < 15)
for (size_t i = 0; i < raw_sz_; ++i)
img_->img_data[i] = rnd_.Rand8();
else
memset(img_->img_data, 0, raw_sz_);
}
ACMRandom rnd_;
int seed_;
};
// Abstract base class for test video sources, which provide a stream of
// decompressed images to the decoder.
class CompressedVideoSource {
public:
virtual ~CompressedVideoSource() {}
virtual void Init() = 0;
// Prepare the stream for reading, rewind/open as necessary.
virtual void Begin() = 0;
// Advance the cursor to the next frame
virtual void Next() = 0;
virtual const uint8_t *cxdata() const = 0;
virtual const unsigned int frame_size() const = 0;
virtual const unsigned int frame_number() const = 0;
};
} // namespace libvpx_test
#endif // TEST_VIDEO_SOURCE_H_
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