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  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. }
  186.