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 66static const char *exec_name; 67 68void usage_exit() { 69 fprintf(stderr, "Usage: %s <infile> <outfile> <N-M|N/M>\n", exec_name); 70 exit(EXIT_FAILURE); 71} 72 73int 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) 88 die("Invalid number of arguments."); 89 90 reader = vpx_video_reader_open(argv[1]); 91 if (!reader) 92 die("Failed to open %s for reading.", argv[1]); 93 94 if (!(outfile = fopen(argv[2], "wb"))) 95 die("Failed to open %s for writing.", argv[2]); 96 97 n = strtol(argv[3], &nptr, 0); 98 m = strtol(nptr + 1, NULL, 0); 99 is_range = (*nptr == '-'); 100 if (!n || !m || (*nptr != '-' && *nptr != '/')) 101 die("Couldn't parse pattern %s.\n", argv[3]); 102 103 info = vpx_video_reader_get_info(reader); 104 105 decoder = get_vpx_decoder_by_fourcc(info->codec_fourcc); 106 if (!decoder) 107 die("Unknown input codec."); 108 109 printf("Using %s\n", vpx_codec_iface_name(decoder->codec_interface())); 110 111 if (vpx_codec_dec_init(&codec, decoder->codec_interface(), NULL, 0)) 112 die_codec(&codec, "Failed to initialize decoder."); 113 114 while (vpx_video_reader_read_frame(reader)) { 115 vpx_codec_iter_t iter = NULL; 116 vpx_image_t *img = NULL; 117 size_t frame_size = 0; 118 int skip; 119 const unsigned char *frame = vpx_video_reader_get_frame(reader, 120 &frame_size); 121 if (vpx_codec_decode(&codec, frame, (unsigned int)frame_size, NULL, 0)) 122 die_codec(&codec, "Failed to decode frame."); 123 124 ++frame_cnt; 125 126 skip = (is_range && frame_cnt >= n && frame_cnt <= m) || 127 (!is_range && m - (frame_cnt - 1) % m <= n); 128 129 if (!skip) { 130 putc('.', stdout); 131 132 while ((img = vpx_codec_get_frame(&codec, &iter)) != NULL) 133 vpx_img_write(img, outfile); 134 } else { 135 putc('X', stdout); 136 } 137 138 fflush(stdout); 139 } 140 141 printf("Processed %d frames.\n", frame_cnt); 142 if (vpx_codec_destroy(&codec)) 143 die_codec(&codec, "Failed to destroy codec."); 144 145 printf("Play: ffplay -f rawvideo -pix_fmt yuv420p -s %dx%d %s\n", 146 info->frame_width, info->frame_height, argv[2]); 147 148 vpx_video_reader_close(reader); 149 fclose(outfile); 150 151 return EXIT_SUCCESS; 152} 153