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 #include "vpx/vp8dx.h" 60 #include "vpx/vpx_decoder.h" 61 62 #include "../tools_common.h" 63 #include "../video_reader.h" 64 #include "./vpx_config.h" 65 66 static const char *exec_name; 67 68 void usage_exit(void) { 69 fprintf(stderr, "Usage: %s <infile> <outfile> <N-M|N/M>\n", exec_name); 70 exit(EXIT_FAILURE); 71 } 72 73 int main(int argc, char **argv) { 74 int frame_cnt = 0; 75 FILE *outfile = NULL; 76 vpx_codec_ctx_t codec; 77 const VpxInterface *decoder = NULL; 78 VpxVideoReader *reader = NULL; 79 const VpxVideoInfo *info = NULL; 80 int n = 0; 81 int m = 0; 82 int is_range = 0; 83 char *nptr = NULL; 84 85 exec_name = argv[0]; 86 87 if (argc != 4) die("Invalid number of arguments."); 88 89 reader = vpx_video_reader_open(argv[1]); 90 if (!reader) die("Failed to open %s for reading.", argv[1]); 91 92 if (!(outfile = fopen(argv[2], "wb"))) 93 die("Failed to open %s for writing.", argv[2]); 94 95 n = (int)strtol(argv[3], &nptr, 0); 96 m = (int)strtol(nptr + 1, NULL, 0); 97 is_range = (*nptr == '-'); 98 if (!n || !m || (*nptr != '-' && *nptr != '/')) 99 die("Couldn't parse pattern %s.\n", argv[3]); 100 101 info = vpx_video_reader_get_info(reader); 102 103 decoder = get_vpx_decoder_by_fourcc(info->codec_fourcc); 104 if (!decoder) die("Unknown input codec."); 105 106 printf("Using %s\n", vpx_codec_iface_name(decoder->codec_interface())); 107 108 if (vpx_codec_dec_init(&codec, decoder->codec_interface(), NULL, 0)) 109 die_codec(&codec, "Failed to initialize decoder."); 110 111 while (vpx_video_reader_read_frame(reader)) { 112 vpx_codec_iter_t iter = NULL; 113 vpx_image_t *img = NULL; 114 size_t frame_size = 0; 115 int skip; 116 const unsigned char *frame = 117 vpx_video_reader_get_frame(reader, &frame_size); 118 if (vpx_codec_decode(&codec, frame, (unsigned int)frame_size, NULL, 0)) 119 die_codec(&codec, "Failed to decode frame."); 120 121 ++frame_cnt; 122 123 skip = (is_range && frame_cnt >= n && frame_cnt <= m) || 124 (!is_range && m - (frame_cnt - 1) % m <= n); 125 126 if (!skip) { 127 putc('.', stdout); 128 129 while ((img = vpx_codec_get_frame(&codec, &iter)) != NULL) 130 vpx_img_write(img, outfile); 131 } else { 132 putc('X', stdout); 133 } 134 135 fflush(stdout); 136 } 137 138 printf("Processed %d frames.\n", frame_cnt); 139 if (vpx_codec_destroy(&codec)) die_codec(&codec, "Failed to destroy codec."); 140 141 printf("Play: ffplay -f rawvideo -pix_fmt yuv420p -s %dx%d %s\n", 142 info->frame_width, info->frame_height, argv[2]); 143 144 vpx_video_reader_close(reader); 145 fclose(outfile); 146 147 return EXIT_SUCCESS; 148 } 149
