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/*
* Copyright (c) 2023 The WebRTC 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.
*/
#include "test/testsupport/y4m_frame_generator.h"
#include <stdio.h>
#include <string.h>
#include <string>
#include "absl/strings/string_view.h"
#include "api/scoped_refptr.h"
#include "api/video/i420_buffer.h"
#include "rtc_base/checks.h"
#include "test/testsupport/frame_reader.h"
namespace webrtc {
namespace test {
namespace {
// Reading 30 bytes from the Y4M header should be enough to get width
// and heigth.
// The header starts with: `YUV4MPEG2 W<WIDTH> H<HEIGTH>`.
constexpr int kHeaderBytesToRead = 30;
} // namespace
Y4mFrameGenerator::Y4mFrameGenerator(absl::string_view filename,
RepeatMode repeat_mode)
: filename_(filename), repeat_mode_(repeat_mode) {
// Read resolution from the Y4M header.
FILE* file = fopen(filename_.c_str(), "r");
RTC_CHECK(file != NULL) << "Cannot open " << filename_;
char header[kHeaderBytesToRead];
RTC_CHECK(fgets(header, sizeof(header), file) != nullptr)
<< "File " << filename_ << " is too small";
fclose(file);
int fps_denominator;
RTC_CHECK_EQ(sscanf(header, "YUV4MPEG2 W%zu H%zu F%i:%i", &width_, &height_,
&fps_, &fps_denominator),
4);
fps_ /= fps_denominator;
RTC_CHECK_GT(width_, 0);
RTC_CHECK_GT(height_, 0);
// Delegate the actual reads (from NextFrame) to a Y4mReader.
frame_reader_ = webrtc::test::CreateY4mFrameReader(
filename_, ToYuvFrameReaderRepeatMode(repeat_mode_));
}
Y4mFrameGenerator::VideoFrameData Y4mFrameGenerator::NextFrame() {
webrtc::VideoFrame::UpdateRect update_rect{0, 0, static_cast<int>(width_),
static_cast<int>(height_)};
rtc::scoped_refptr<webrtc::I420Buffer> next_frame_buffer =
frame_reader_->PullFrame();
if (!next_frame_buffer ||
(static_cast<size_t>(next_frame_buffer->width()) == width_ &&
static_cast<size_t>(next_frame_buffer->height()) == height_)) {
return VideoFrameData(next_frame_buffer, update_rect);
}
// Allocate a new buffer and return scaled version.
rtc::scoped_refptr<webrtc::I420Buffer> scaled_buffer(
I420Buffer::Create(width_, height_));
webrtc::I420Buffer::SetBlack(scaled_buffer.get());
scaled_buffer->ScaleFrom(*next_frame_buffer->ToI420());
return VideoFrameData(scaled_buffer, update_rect);
}
void Y4mFrameGenerator::ChangeResolution(size_t width, size_t height) {
width_ = width;
height_ = height;
RTC_CHECK_GT(width_, 0);
RTC_CHECK_GT(height_, 0);
}
FrameGeneratorInterface::Resolution Y4mFrameGenerator::GetResolution() const {
return {.width = width_, .height = height_};
}
YuvFrameReaderImpl::RepeatMode Y4mFrameGenerator::ToYuvFrameReaderRepeatMode(
RepeatMode repeat_mode) const {
switch (repeat_mode) {
case RepeatMode::kSingle:
return YuvFrameReaderImpl::RepeatMode::kSingle;
case RepeatMode::kLoop:
return YuvFrameReaderImpl::RepeatMode::kRepeat;
case RepeatMode::kPingPong:
return YuvFrameReaderImpl::RepeatMode::kPingPong;
}
}
} // namespace test
} // namespace webrtc
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