| 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 <libavformat/avformat.h> |
| 26 | |
| 27 | static AVFormatContext *fmt_ctx = NULL; |
| 28 | static AVCodecContext *video_dec_ctx = NULL; |
| 29 | static AVStream *video_stream = NULL; |
| 30 | static const char *src_filename = NULL; |
| 31 | |
| 32 | static int video_stream_idx = -1; |
| 33 | static AVFrame *frame = NULL; |
| 34 | static AVPacket pkt; |
| 35 | static int video_frame_count = 0; |
| 36 | |
| 37 | static int decode_packet(int *got_frame, int cached) |
| 38 | { |
| 39 | int decoded = pkt.size; |
| 40 | |
| 41 | *got_frame = 0; |
| 42 | |
| 43 | if (pkt.stream_index == video_stream_idx) { |
| 44 | int ret = avcodec_decode_video2(video_dec_ctx, frame, got_frame, &pkt); |
| 45 | if (ret < 0) { |
| 46 | fprintf(stderr, "Error decoding video frame (%s)\n", av_err2str(ret)); |
| 47 | return ret; |
| 48 | } |
| 49 | |
| 50 | if (*got_frame) { |
| 51 | int i; |
| 52 | AVFrameSideData *sd; |
| 53 | |
| 54 | video_frame_count++; |
| 55 | sd = av_frame_get_side_data(frame, AV_FRAME_DATA_MOTION_VECTORS); |
| 56 | if (sd) { |
| 57 | const AVMotionVector *mvs = (const AVMotionVector *)sd->data; |
| 58 | for (i = 0; i < sd->size / sizeof(*mvs); i++) { |
| 59 | const AVMotionVector *mv = &mvs[i]; |
| 60 | printf("%d,%2d,%2d,%2d,%4d,%4d,%4d,%4d,0x%"PRIx64"\n", |
| 61 | video_frame_count, mv->source, |
| 62 | mv->w, mv->h, mv->src_x, mv->src_y, |
| 63 | mv->dst_x, mv->dst_y, mv->flags); |
| 64 | } |
| 65 | } |
| 66 | } |
| 67 | } |
| 68 | |
| 69 | return decoded; |
| 70 | } |
| 71 | |
| 72 | static int open_codec_context(int *stream_idx, |
| 73 | AVFormatContext *fmt_ctx, enum AVMediaType type) |
| 74 | { |
| 75 | int ret; |
| 76 | AVStream *st; |
| 77 | AVCodecContext *dec_ctx = NULL; |
| 78 | AVCodec *dec = NULL; |
| 79 | AVDictionary *opts = NULL; |
| 80 | |
| 81 | ret = av_find_best_stream(fmt_ctx, type, -1, -1, NULL, 0); |
| 82 | if (ret < 0) { |
| 83 | fprintf(stderr, "Could not find %s stream in input file '%s'\n", |
| 84 | av_get_media_type_string(type), src_filename); |
| 85 | return ret; |
| 86 | } else { |
| 87 | *stream_idx = ret; |
| 88 | st = fmt_ctx->streams[*stream_idx]; |
| 89 | |
| 90 | /* find decoder for the stream */ |
| 91 | dec_ctx = st->codec; |
| 92 | dec = avcodec_find_decoder(dec_ctx->codec_id); |
| 93 | if (!dec) { |
| 94 | fprintf(stderr, "Failed to find %s codec\n", |
| 95 | av_get_media_type_string(type)); |
| 96 | return AVERROR(EINVAL); |
| 97 | } |
| 98 | |
| 99 | /* Init the video decoder */ |
| 100 | av_dict_set(&opts, "flags2", "+export_mvs", 0); |
| 101 | if ((ret = avcodec_open2(dec_ctx, dec, &opts)) < 0) { |
| 102 | fprintf(stderr, "Failed to open %s codec\n", |
| 103 | av_get_media_type_string(type)); |
| 104 | return ret; |
| 105 | } |
| 106 | } |
| 107 | |
| 108 | return 0; |
| 109 | } |
| 110 | |
| 111 | int main(int argc, char **argv) |
| 112 | { |
| 113 | int ret = 0, got_frame; |
| 114 | |
| 115 | if (argc != 2) { |
| 116 | fprintf(stderr, "Usage: %s <video>\n", argv[0]); |
| 117 | exit(1); |
| 118 | } |
| 119 | src_filename = argv[1]; |
| 120 | |
| 121 | av_register_all(); |
| 122 | |
| 123 | if (avformat_open_input(&fmt_ctx, src_filename, NULL, NULL) < 0) { |
| 124 | fprintf(stderr, "Could not open source file %s\n", src_filename); |
| 125 | exit(1); |
| 126 | } |
| 127 | |
| 128 | if (avformat_find_stream_info(fmt_ctx, NULL) < 0) { |
| 129 | fprintf(stderr, "Could not find stream information\n"); |
| 130 | exit(1); |
| 131 | } |
| 132 | |
| 133 | if (open_codec_context(&video_stream_idx, fmt_ctx, AVMEDIA_TYPE_VIDEO) >= 0) { |
| 134 | video_stream = fmt_ctx->streams[video_stream_idx]; |
| 135 | video_dec_ctx = video_stream->codec; |
| 136 | } |
| 137 | |
| 138 | av_dump_format(fmt_ctx, 0, src_filename, 0); |
| 139 | |
| 140 | if (!video_stream) { |
| 141 | fprintf(stderr, "Could not find video stream in the input, aborting\n"); |
| 142 | ret = 1; |
| 143 | goto end; |
| 144 | } |
| 145 | |
| 146 | frame = av_frame_alloc(); |
| 147 | if (!frame) { |
| 148 | fprintf(stderr, "Could not allocate frame\n"); |
| 149 | ret = AVERROR(ENOMEM); |
| 150 | goto end; |
| 151 | } |
| 152 | |
| 153 | printf("framenum,source,blockw,blockh,srcx,srcy,dstx,dsty,flags\n"); |
| 154 | |
| 155 | /* initialize packet, set data to NULL, let the demuxer fill it */ |
| 156 | av_init_packet(&pkt); |
| 157 | pkt.data = NULL; |
| 158 | pkt.size = 0; |
| 159 | |
| 160 | /* read frames from the file */ |
| 161 | while (av_read_frame(fmt_ctx, &pkt) >= 0) { |
| 162 | AVPacket orig_pkt = pkt; |
| 163 | do { |
| 164 | ret = decode_packet(&got_frame, 0); |
| 165 | if (ret < 0) |
| 166 | break; |
| 167 | pkt.data += ret; |
| 168 | pkt.size -= ret; |
| 169 | } while (pkt.size > 0); |
| 170 | av_free_packet(&orig_pkt); |
| 171 | } |
| 172 | |
| 173 | /* flush cached frames */ |
| 174 | pkt.data = NULL; |
| 175 | pkt.size = 0; |
| 176 | do { |
| 177 | decode_packet(&got_frame, 1); |
| 178 | } while (got_frame); |
| 179 | |
| 180 | end: |
| 181 | avcodec_close(video_dec_ctx); |
| 182 | avformat_close_input(&fmt_ctx); |
| 183 | av_frame_free(&frame); |
| 184 | return ret < 0; |
| 185 | } |