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
20using std::string;
21
22namespace webrtc {
23
24int 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