vpx/test/yuv_video_source.h

/*
 *  Copyright (c) 2014 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_YUV_VIDEO_SOURCE_H_
#define TEST_YUV_VIDEO_SOURCE_H_

#include <cstdio>
#include <cstdlib>
#include <string>

#include "test/video_source.h"
#include "vpx/vpx_image.h"

namespace libvpx_test {

// This class extends VideoSource to allow parsing of raw YUV
// formats of various color sampling and bit-depths so that we can
// do actual file encodes.
class YUVVideoSource : public VideoSource {
 public:
  YUVVideoSource(const std::string &file_name, vpx_img_fmt format,
                 unsigned int width, unsigned int height,
                 int rate_numerator, int rate_denominator,
                 unsigned int start, int limit)
      : file_name_(file_name),
        input_file_(NULL),
        img_(NULL),
        start_(start),
        limit_(limit),
        frame_(0),
        width_(0),
        height_(0),
        format_(VPX_IMG_FMT_NONE),
        framerate_numerator_(rate_numerator),
        framerate_denominator_(rate_denominator) {
    // This initializes format_, raw_size_, width_, height_ and allocates img.
    SetSize(width, height, format);
  }

  virtual ~YUVVideoSource() {
    vpx_img_free(img_);
    if (input_file_)
      fclose(input_file_);
  }

  virtual void Begin() {
    if (input_file_)
      fclose(input_file_);
    input_file_ = OpenTestDataFile(file_name_);
    ASSERT_TRUE(input_file_ != NULL) << "Input file open failed. Filename: "
                                     << file_name_;
    if (start_)
      fseek(input_file_, static_cast<unsigned>(raw_size_) * start_, SEEK_SET);

    frame_ = start_;
    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 = { framerate_denominator_, framerate_numerator_ };
    return t;
  }

  virtual unsigned int frame() const { return frame_; }

  virtual unsigned int limit() const { return limit_; }

  virtual void SetSize(unsigned int width, unsigned int height,
                       vpx_img_fmt format) {
    if (width != width_ || height != height_ || format != format_) {
      vpx_img_free(img_);
      img_ = vpx_img_alloc(NULL, format, width, height, 1);
      ASSERT_TRUE(img_ != NULL);
      width_ = width;
      height_ = height;
      format_ = format;
      switch (format) {
        case VPX_IMG_FMT_I420:
          raw_size_ = width * height * 3 / 2;
          break;
        case VPX_IMG_FMT_I422:
          raw_size_ = width * height * 2;
          break;
        case VPX_IMG_FMT_I440:
          raw_size_ = width * height * 2;
          break;
        case VPX_IMG_FMT_I444:
          raw_size_ = width * height * 3;
          break;
        case VPX_IMG_FMT_I42016:
          raw_size_ = width * height * 3;
          break;
        case VPX_IMG_FMT_I42216:
          raw_size_ = width * height * 4;
          break;
        case VPX_IMG_FMT_I44016:
          raw_size_ = width * height * 4;
          break;
        case VPX_IMG_FMT_I44416:
          raw_size_ = width * height * 6;
          break;
        default:
          ASSERT_TRUE(0);
      }
    }
  }

  virtual void FillFrame() {
    ASSERT_TRUE(input_file_ != NULL);
    // Read a frame from input_file.
    if (fread(img_->img_data, raw_size_, 1, input_file_) == 0) {
      limit_ = frame_;
    }
  }

 protected:
  std::string file_name_;
  FILE *input_file_;
  vpx_image_t *img_;
  size_t raw_size_;
  unsigned int start_;
  unsigned int limit_;
  unsigned int frame_;
  unsigned int width_;
  unsigned int height_;
  vpx_img_fmt format_;
  int framerate_numerator_;
  int framerate_denominator_;
};

}  // namespace libvpx_test

#endif  // TEST_YUV_VIDEO_SOURCE_H_