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      1 /*
      2  *  Copyright (c) 2012 The WebRTC 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 
     11 #include <stdio.h>
     12 #include <stdlib.h>
     13 
     14 #include <string>
     15 
     16 #include "webrtc/common_video/libyuv/include/webrtc_libyuv.h"
     17 #include "webrtc/system_wrappers/interface/scoped_ptr.h"
     18 #include "webrtc/typedefs.h"
     19 
     20 using std::string;
     21 
     22 namespace webrtc {
     23 
     24 int EditFrames(const string& in_path, int width, int height,
     25                int first_frame_to_process, int interval,
     26                int last_frame_to_process, const string& out_path) {
     27   if (last_frame_to_process < first_frame_to_process) {
     28     fprintf(stderr, "The set of frames to cut is empty! (l < f)\n");
     29     return -10;
     30   }
     31 
     32   FILE* in_fid = fopen(in_path.c_str() , "rb");
     33   if (!in_fid) {
     34     fprintf(stderr, "Could not read input file: %s.\n", in_path.c_str());
     35     return -11;
     36   }
     37 
     38   // Frame size of I420.
     39   int frame_length = CalcBufferSize(kI420, width, height);
     40 
     41   webrtc::scoped_ptr<uint8_t[]> temp_buffer(new uint8_t[frame_length]);
     42 
     43   FILE* out_fid = fopen(out_path.c_str(), "wb");
     44 
     45   if (!out_fid) {
     46     fprintf(stderr, "Could not open output file: %s.\n", out_path.c_str());
     47     fclose(in_fid);
     48     return -12;
     49   }
     50 
     51   int num_frames_read = 0;
     52   int num_frames_read_between = 0;
     53   int num_bytes_read;
     54 
     55   while ((num_bytes_read = fread(temp_buffer.get(), 1, frame_length, in_fid))
     56       == frame_length) {
     57     num_frames_read++;
     58     if ((num_frames_read < first_frame_to_process) ||
     59         (last_frame_to_process < num_frames_read)) {
     60       fwrite(temp_buffer.get(), 1, frame_length, out_fid);
     61     } else {
     62       num_frames_read_between++;
     63       if (interval <= 0) {
     64         if (interval == -1) {
     65           // Remove all frames.
     66         } else {
     67           if (((num_frames_read_between - 1) % interval) == 0) {
     68             // Keep only every |interval| frame.
     69             fwrite(temp_buffer.get(), 1, frame_length, out_fid);
     70           }
     71         }
     72       } else if (interval > 0) {
     73         for (int i = 1; i <= interval; ++i) {
     74           fwrite(temp_buffer.get(), 1, frame_length, out_fid);
     75         }
     76       }
     77     }
     78   }
     79   if (num_bytes_read > 0 && num_bytes_read < frame_length) {
     80     printf("Frame to small! Last frame truncated.\n");
     81   }
     82   fclose(in_fid);
     83   fclose(out_fid);
     84 
     85   printf("Done editing!\n");
     86   return 0;
     87 }
     88 }  // namespace webrtc
     89