1 /*
2 * Copyright (c) 2012 Stefano Sabatini
3 * Copyright (c) 2014 Clément Bœsch
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a copy
6 * of this software and associated documentation files (the "Software"), to deal
7 * in the Software without restriction, including without limitation the rights
8 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
9 * copies of the Software, and to permit persons to whom the Software is
10 * furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
21 * THE SOFTWARE.
22 */
23
24 #include <libavutil/motion_vector.h>
25 #include <libavcodec/avcodec.h>
26 #include <libavformat/avformat.h>
27
28 static AVFormatContext *fmt_ctx = NULL;
29 static AVCodecContext *video_dec_ctx = NULL;
30 static AVStream *video_stream = NULL;
31 static const char *src_filename = NULL;
32
33 static int video_stream_idx = -1;
34 static AVFrame *frame = NULL;
35 static int video_frame_count = 0;
36
decode_packet(const AVPacket *pkt)37 static int decode_packet(const AVPacket *pkt)
38 {
39 int ret = avcodec_send_packet(video_dec_ctx, pkt);
40 if (ret < 0) {
41 fprintf(stderr, "Error while sending a packet to the decoder: %s\n", av_err2str(ret));
42 return ret;
43 }
44
45 while (ret >= 0) {
46 ret = avcodec_receive_frame(video_dec_ctx, frame);
47 if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) {
48 break;
49 } else if (ret < 0) {
50 fprintf(stderr, "Error while receiving a frame from the decoder: %s\n", av_err2str(ret));
51 return ret;
52 }
53
54 if (ret >= 0) {
55 int i;
56 AVFrameSideData *sd;
57
58 video_frame_count++;
59 sd = av_frame_get_side_data(frame, AV_FRAME_DATA_MOTION_VECTORS);
60 if (sd) {
61 const AVMotionVector *mvs = (const AVMotionVector *)sd->data;
62 for (i = 0; i < sd->size / sizeof(*mvs); i++) {
63 const AVMotionVector *mv = &mvs[i];
64 printf("%d,%2d,%2d,%2d,%4d,%4d,%4d,%4d,0x%"PRIx64"\n",
65 video_frame_count, mv->source,
66 mv->w, mv->h, mv->src_x, mv->src_y,
67 mv->dst_x, mv->dst_y, mv->flags);
68 }
69 }
70 av_frame_unref(frame);
71 }
72 }
73
74 return 0;
75 }
76
open_codec_context(AVFormatContext *fmt_ctx, enum AVMediaType type)77 static int open_codec_context(AVFormatContext *fmt_ctx, enum AVMediaType type)
78 {
79 int ret;
80 AVStream *st;
81 AVCodecContext *dec_ctx = NULL;
82 const AVCodec *dec = NULL;
83 AVDictionary *opts = NULL;
84
85 ret = av_find_best_stream(fmt_ctx, type, -1, -1, &dec, 0);
86 if (ret < 0) {
87 fprintf(stderr, "Could not find %s stream in input file '%s'\n",
88 av_get_media_type_string(type), src_filename);
89 return ret;
90 } else {
91 int stream_idx = ret;
92 st = fmt_ctx->streams[stream_idx];
93
94 dec_ctx = avcodec_alloc_context3(dec);
95 if (!dec_ctx) {
96 fprintf(stderr, "Failed to allocate codec\n");
97 return AVERROR(EINVAL);
98 }
99
100 ret = avcodec_parameters_to_context(dec_ctx, st->codecpar);
101 if (ret < 0) {
102 fprintf(stderr, "Failed to copy codec parameters to codec context\n");
103 return ret;
104 }
105
106 /* Init the video decoder */
107 av_dict_set(&opts, "flags2", "+export_mvs", 0);
108 ret = avcodec_open2(dec_ctx, dec, &opts);
109 av_dict_free(&opts);
110 if (ret < 0) {
111 fprintf(stderr, "Failed to open %s codec\n",
112 av_get_media_type_string(type));
113 return ret;
114 }
115
116 video_stream_idx = stream_idx;
117 video_stream = fmt_ctx->streams[video_stream_idx];
118 video_dec_ctx = dec_ctx;
119 }
120
121 return 0;
122 }
123
main(int argc, char **argv)124 int main(int argc, char **argv)
125 {
126 int ret = 0;
127 AVPacket *pkt = NULL;
128
129 if (argc != 2) {
130 fprintf(stderr, "Usage: %s <video>\n", argv[0]);
131 exit(1);
132 }
133 src_filename = argv[1];
134
135 if (avformat_open_input(&fmt_ctx, src_filename, NULL, NULL) < 0) {
136 fprintf(stderr, "Could not open source file %s\n", src_filename);
137 exit(1);
138 }
139
140 if (avformat_find_stream_info(fmt_ctx, NULL) < 0) {
141 fprintf(stderr, "Could not find stream information\n");
142 exit(1);
143 }
144
145 open_codec_context(fmt_ctx, AVMEDIA_TYPE_VIDEO);
146
147 av_dump_format(fmt_ctx, 0, src_filename, 0);
148
149 if (!video_stream) {
150 fprintf(stderr, "Could not find video stream in the input, aborting\n");
151 ret = 1;
152 goto end;
153 }
154
155 frame = av_frame_alloc();
156 if (!frame) {
157 fprintf(stderr, "Could not allocate frame\n");
158 ret = AVERROR(ENOMEM);
159 goto end;
160 }
161
162 pkt = av_packet_alloc();
163 if (!pkt) {
164 fprintf(stderr, "Could not allocate AVPacket\n");
165 ret = AVERROR(ENOMEM);
166 goto end;
167 }
168
169 printf("framenum,source,blockw,blockh,srcx,srcy,dstx,dsty,flags\n");
170
171 /* read frames from the file */
172 while (av_read_frame(fmt_ctx, pkt) >= 0) {
173 if (pkt->stream_index == video_stream_idx)
174 ret = decode_packet(pkt);
175 av_packet_unref(pkt);
176 if (ret < 0)
177 break;
178 }
179
180 /* flush cached frames */
181 decode_packet(NULL);
182
183 end:
184 avcodec_free_context(&video_dec_ctx);
185 avformat_close_input(&fmt_ctx);
186 av_frame_free(&frame);
187 av_packet_free(&pkt);
188 return ret < 0;
189 }
190