Ticket #10852: main_memcheck.cpp

#include <iostream>

extern "C" {
  #include <libswscale/swscale.h>
}

int main() {
  constexpr int width = 1080;
  constexpr int height = 1920;
  constexpr AVPixelFormat pix_fmt = AV_PIX_FMT_YUVJ420P;
  constexpr int initial_value = 123;

  AVFrame* frame = av_frame_alloc();
  if (!frame) {
    return 1;
  }

  frame->width = width;
  frame->height = height;
  frame->format = pix_fmt;
  int ret = av_frame_get_buffer(frame, 0);

  uint8_t *output_buffer = new uint8_t[width * height * 3];// + 8];
  // for (int i=0; i<8; i++) {
  //   output_buffer[width * height * 3 + i] = initial_value;
  // }
  const int output_stride[] = { width * 3 };

  SwsContext *sws_ctx_ = sws_getContext(width,
                              height,
                              pix_fmt,
                              width,
                              height,
                              AV_PIX_FMT_BGR24,
                              0,
                              nullptr,
                              nullptr,
                              nullptr);

  sws_scale(sws_ctx_, frame->data, frame->linesize, 0, height, &output_buffer, output_stride);

  // checking if memory was modified beyond buffer
  // for (int i=0; i<8; i++) {
  //   if (output_buffer[width * height * 3 + i] != initial_value) {
  //     std::cerr << "Memory was modified " << i << " bytes beyond buffer: " << (int)output_buffer[width * height * 3 + i] << std::endl;
  //   }
  // }

  delete[] output_buffer;
  av_frame_free(&frame);
  sws_freeContext(sws_ctx_);
}