1/*
2 *  Copyright (c) 2010 The WebM 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// Decode With Drops Example
12// =========================
13//
14// This is an example utility which drops a series of frames, as specified
15// on the command line. This is useful for observing the error recovery
16// features of the codec.
17//
18// Usage
19// -----
20// This example adds a single argument to the `simple_decoder` example,
21// which specifies the range or pattern of frames to drop. The parameter is
22// parsed as follows:
23//
24// Dropping A Range Of Frames
25// --------------------------
26// To drop a range of frames, specify the starting frame and the ending
27// frame to drop, separated by a dash. The following command will drop
28// frames 5 through 10 (base 1).
29//
30//  $ ./decode_with_drops in.ivf out.i420 5-10
31//
32//
33// Dropping A Pattern Of Frames
34// ----------------------------
35// To drop a pattern of frames, specify the number of frames to drop and
36// the number of frames after which to repeat the pattern, separated by
37// a forward-slash. The following command will drop 3 of 7 frames.
38// Specifically, it will decode 4 frames, then drop 3 frames, and then
39// repeat.
40//
41//  $ ./decode_with_drops in.ivf out.i420 3/7
42//
43//
44// Extra Variables
45// ---------------
46// This example maintains the pattern passed on the command line in the
47// `n`, `m`, and `is_range` variables:
48//
49//
50// Making The Drop Decision
51// ------------------------
52// The example decides whether to drop the frame based on the current
53// frame number, immediately before decoding the frame.
54
55#include <stdio.h>
56#include <stdlib.h>
57#include <string.h>
58
59#define VPX_CODEC_DISABLE_COMPAT 1
60
61#include "vpx/vp8dx.h"
62#include "vpx/vpx_decoder.h"
63
64#include "./tools_common.h"
65#include "./video_reader.h"
66#include "./vpx_config.h"
67
68static const char *exec_name;
69
70void usage_exit() {
71  fprintf(stderr, "Usage: %s <infile> <outfile> <N-M|N/M>\n", exec_name);
72  exit(EXIT_FAILURE);
73}
74
75int main(int argc, char **argv) {
76  int frame_cnt = 0;
77  FILE *outfile = NULL;
78  vpx_codec_ctx_t codec;
79  const VpxInterface *decoder = NULL;
80  VpxVideoReader *reader = NULL;
81  const VpxVideoInfo *info = NULL;
82  int n = 0;
83  int m = 0;
84  int is_range = 0;
85  char *nptr = NULL;
86
87  exec_name = argv[0];
88
89  if (argc != 4)
90    die("Invalid number of arguments.");
91
92  reader = vpx_video_reader_open(argv[1]);
93  if (!reader)
94    die("Failed to open %s for reading.", argv[1]);
95
96  if (!(outfile = fopen(argv[2], "wb")))
97    die("Failed to open %s for writing.", argv[2]);
98
99  n = strtol(argv[3], &nptr, 0);
100  m = strtol(nptr + 1, NULL, 0);
101  is_range = (*nptr == '-');
102  if (!n || !m || (*nptr != '-' && *nptr != '/'))
103    die("Couldn't parse pattern %s.\n", argv[3]);
104
105  info = vpx_video_reader_get_info(reader);
106
107  decoder = get_vpx_decoder_by_fourcc(info->codec_fourcc);
108  if (!decoder)
109    die("Unknown input codec.");
110
111  printf("Using %s\n", vpx_codec_iface_name(decoder->interface()));
112
113  if (vpx_codec_dec_init(&codec, decoder->interface(), NULL, 0))
114    die_codec(&codec, "Failed to initialize decoder.");
115
116  while (vpx_video_reader_read_frame(reader)) {
117    vpx_codec_iter_t iter = NULL;
118    vpx_image_t *img = NULL;
119    size_t frame_size = 0;
120    int skip;
121    const unsigned char *frame = vpx_video_reader_get_frame(reader,
122                                                            &frame_size);
123    if (vpx_codec_decode(&codec, frame, (unsigned int)frame_size, NULL, 0))
124      die_codec(&codec, "Failed to decode frame.");
125
126    ++frame_cnt;
127
128    skip = (is_range && frame_cnt >= n && frame_cnt <= m) ||
129           (!is_range && m - (frame_cnt - 1) % m <= n);
130
131    if (!skip) {
132      putc('.', stdout);
133
134      while ((img = vpx_codec_get_frame(&codec, &iter)) != NULL)
135        vpx_img_write(img, outfile);
136    } else {
137      putc('X', stdout);
138    }
139
140    fflush(stdout);
141  }
142
143  printf("Processed %d frames.\n", frame_cnt);
144  if (vpx_codec_destroy(&codec))
145    die_codec(&codec, "Failed to destroy codec.");
146
147  printf("Play: ffplay -f rawvideo -pix_fmt yuv420p -s %dx%d %s\n",
148         info->frame_width, info->frame_height, argv[2]);
149
150  vpx_video_reader_close(reader);
151  fclose(outfile);
152
153  return EXIT_SUCCESS;
154}
155