decode_with_drops.c (4422B)
1 /* 2 * Copyright (c) 2016, Alliance for Open Media. All rights reserved. 3 * 4 * This source code is subject to the terms of the BSD 2 Clause License and 5 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License 6 * was not distributed with this source code in the LICENSE file, you can 7 * obtain it at www.aomedia.org/license/software. If the Alliance for Open 8 * Media Patent License 1.0 was not distributed with this source code in the 9 * PATENTS file, you can obtain it at www.aomedia.org/license/patent. 10 */ 11 12 // Decode With Drops Example 13 // ========================= 14 // 15 // This is an example utility which drops a series of frames, as specified 16 // on the command line. This is useful for observing the error recovery 17 // features of the codec. 18 // 19 // Usage 20 // ----- 21 // This example adds a single argument to the `simple_decoder` example, 22 // which specifies the range or pattern of frames to drop. The parameter is 23 // parsed as follows: 24 // 25 // Dropping A Range Of Frames 26 // -------------------------- 27 // To drop a range of frames, specify the starting frame and the ending 28 // frame to drop, separated by a dash. The following command will drop 29 // frames 5 through 10 (base 1). 30 // 31 // $ ./decode_with_drops in.ivf out.i420 5-10 32 // 33 // 34 // Dropping A Pattern Of Frames 35 // ---------------------------- 36 // To drop a pattern of frames, specify the number of frames to drop and 37 // the number of frames after which to repeat the pattern, separated by 38 // a forward-slash. The following command will drop 3 of 7 frames. 39 // Specifically, it will decode 4 frames, then drop 3 frames, and then 40 // repeat. 41 // 42 // $ ./decode_with_drops in.ivf out.i420 3/7 43 // 44 // 45 // Extra Variables 46 // --------------- 47 // This example maintains the pattern passed on the command line in the 48 // `n`, `m`, and `is_range` variables: 49 // 50 // 51 // Making The Drop Decision 52 // ------------------------ 53 // The example decides whether to drop the frame based on the current 54 // frame number, immediately before decoding the frame. 55 56 #include <stdio.h> 57 #include <stdlib.h> 58 #include <string.h> 59 60 #include "aom/aom_decoder.h" 61 #include "aom/aomdx.h" 62 #include "common/tools_common.h" 63 #include "common/video_reader.h" 64 65 static const char *exec_name; 66 67 void usage_exit(void) { 68 fprintf(stderr, "Usage: %s <infile> <outfile> <N-M|N/M>\n", exec_name); 69 exit(EXIT_FAILURE); 70 } 71 72 int main(int argc, char **argv) { 73 int frame_cnt = 0; 74 FILE *outfile = NULL; 75 AvxVideoReader *reader = NULL; 76 const AvxVideoInfo *info = NULL; 77 int n = 0; 78 int m = 0; 79 int is_range = 0; 80 char *nptr = NULL; 81 82 exec_name = argv[0]; 83 84 if (argc != 4) die("Invalid number of arguments."); 85 86 reader = aom_video_reader_open(argv[1]); 87 if (!reader) die("Failed to open %s for reading.", argv[1]); 88 89 if (!(outfile = fopen(argv[2], "wb"))) 90 die("Failed to open %s for writing.", argv[2]); 91 92 n = (int)strtol(argv[3], &nptr, 0); 93 m = (int)strtol(nptr + 1, NULL, 0); 94 is_range = (*nptr == '-'); 95 if (!n || !m || (*nptr != '-' && *nptr != '/')) 96 die("Couldn't parse pattern %s.\n", argv[3]); 97 98 info = aom_video_reader_get_info(reader); 99 100 aom_codec_iface_t *decoder = get_aom_decoder_by_fourcc(info->codec_fourcc); 101 if (!decoder) die("Unknown input codec."); 102 103 printf("Using %s\n", aom_codec_iface_name(decoder)); 104 aom_codec_ctx_t codec; 105 if (aom_codec_dec_init(&codec, decoder, NULL, 0)) 106 die("Failed to initialize decoder."); 107 108 while (aom_video_reader_read_frame(reader)) { 109 aom_codec_iter_t iter = NULL; 110 aom_image_t *img = NULL; 111 size_t frame_size = 0; 112 int skip; 113 const unsigned char *frame = 114 aom_video_reader_get_frame(reader, &frame_size); 115 ++frame_cnt; 116 117 skip = (is_range && frame_cnt >= n && frame_cnt <= m) || 118 (!is_range && m - (frame_cnt - 1) % m <= n); 119 120 if (!skip) { 121 putc('.', stdout); 122 if (aom_codec_decode(&codec, frame, frame_size, NULL)) 123 die_codec(&codec, "Failed to decode frame."); 124 125 while ((img = aom_codec_get_frame(&codec, &iter)) != NULL) 126 aom_img_write(img, outfile); 127 } else { 128 putc('X', stdout); 129 } 130 131 fflush(stdout); 132 } 133 134 printf("Processed %d frames.\n", frame_cnt); 135 if (aom_codec_destroy(&codec)) die_codec(&codec, "Failed to destroy codec."); 136 137 printf("Play: ffplay -f rawvideo -pix_fmt yuv420p -s %dx%d %s\n", 138 info->frame_width, info->frame_height, argv[2]); 139 140 aom_video_reader_close(reader); 141 fclose(outfile); 142 143 return EXIT_SUCCESS; 144 }