| /* |
| * Copyright (c) 2012 Stefano Sabatini |
| * Copyright (c) 2014 Clément Bœsch |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a copy |
| * of this software and associated documentation files (the "Software"), to deal |
| * in the Software without restriction, including without limitation the rights |
| * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| * copies of the Software, and to permit persons to whom the Software is |
| * furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be included in |
| * all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| * THE SOFTWARE. |
| */ |
| |
| #include <libavutil/motion_vector.h> |
| #include <libavformat/avformat.h> |
| |
| static AVFormatContext *fmt_ctx = NULL; |
| static AVCodecContext *video_dec_ctx = NULL; |
| static AVStream *video_stream = NULL; |
| static const char *src_filename = NULL; |
| |
| static int video_stream_idx = -1; |
| static AVFrame *frame = NULL; |
| static int video_frame_count = 0; |
| |
| static int decode_packet(const AVPacket *pkt) |
| { |
| int ret = avcodec_send_packet(video_dec_ctx, pkt); |
| if (ret < 0) { |
| fprintf(stderr, "Error while sending a packet to the decoder: %s\n", av_err2str(ret)); |
| return ret; |
| } |
| |
| while (ret >= 0) { |
| ret = avcodec_receive_frame(video_dec_ctx, frame); |
| if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) { |
| break; |
| } else if (ret < 0) { |
| fprintf(stderr, "Error while receiving a frame from the decoder: %s\n", av_err2str(ret)); |
| return ret; |
| } |
| |
| if (ret >= 0) { |
| int i; |
| AVFrameSideData *sd; |
| |
| video_frame_count++; |
| sd = av_frame_get_side_data(frame, AV_FRAME_DATA_MOTION_VECTORS); |
| if (sd) { |
| const AVMotionVector *mvs = (const AVMotionVector *)sd->data; |
| for (i = 0; i < sd->size / sizeof(*mvs); i++) { |
| const AVMotionVector *mv = &mvs[i]; |
| printf("%d,%2d,%2d,%2d,%4d,%4d,%4d,%4d,0x%"PRIx64"\n", |
| video_frame_count, mv->source, |
| mv->w, mv->h, mv->src_x, mv->src_y, |
| mv->dst_x, mv->dst_y, mv->flags); |
| } |
| } |
| av_frame_unref(frame); |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int open_codec_context(AVFormatContext *fmt_ctx, enum AVMediaType type) |
| { |
| int ret; |
| AVStream *st; |
| AVCodecContext *dec_ctx = NULL; |
| AVCodec *dec = NULL; |
| AVDictionary *opts = NULL; |
| |
| ret = av_find_best_stream(fmt_ctx, type, -1, -1, &dec, 0); |
| if (ret < 0) { |
| fprintf(stderr, "Could not find %s stream in input file '%s'\n", |
| av_get_media_type_string(type), src_filename); |
| return ret; |
| } else { |
| int stream_idx = ret; |
| st = fmt_ctx->streams[stream_idx]; |
| |
| dec_ctx = avcodec_alloc_context3(dec); |
| if (!dec_ctx) { |
| fprintf(stderr, "Failed to allocate codec\n"); |
| return AVERROR(EINVAL); |
| } |
| |
| ret = avcodec_parameters_to_context(dec_ctx, st->codecpar); |
| if (ret < 0) { |
| fprintf(stderr, "Failed to copy codec parameters to codec context\n"); |
| return ret; |
| } |
| |
| /* Init the video decoder */ |
| av_dict_set(&opts, "flags2", "+export_mvs", 0); |
| if ((ret = avcodec_open2(dec_ctx, dec, &opts)) < 0) { |
| fprintf(stderr, "Failed to open %s codec\n", |
| av_get_media_type_string(type)); |
| return ret; |
| } |
| |
| video_stream_idx = stream_idx; |
| video_stream = fmt_ctx->streams[video_stream_idx]; |
| video_dec_ctx = dec_ctx; |
| } |
| |
| return 0; |
| } |
| |
| int main(int argc, char **argv) |
| { |
| int ret = 0; |
| AVPacket pkt = { 0 }; |
| |
| if (argc != 2) { |
| fprintf(stderr, "Usage: %s <video>\n", argv[0]); |
| exit(1); |
| } |
| src_filename = argv[1]; |
| |
| if (avformat_open_input(&fmt_ctx, src_filename, NULL, NULL) < 0) { |
| fprintf(stderr, "Could not open source file %s\n", src_filename); |
| exit(1); |
| } |
| |
| if (avformat_find_stream_info(fmt_ctx, NULL) < 0) { |
| fprintf(stderr, "Could not find stream information\n"); |
| exit(1); |
| } |
| |
| open_codec_context(fmt_ctx, AVMEDIA_TYPE_VIDEO); |
| |
| av_dump_format(fmt_ctx, 0, src_filename, 0); |
| |
| if (!video_stream) { |
| fprintf(stderr, "Could not find video stream in the input, aborting\n"); |
| ret = 1; |
| goto end; |
| } |
| |
| frame = av_frame_alloc(); |
| if (!frame) { |
| fprintf(stderr, "Could not allocate frame\n"); |
| ret = AVERROR(ENOMEM); |
| goto end; |
| } |
| |
| printf("framenum,source,blockw,blockh,srcx,srcy,dstx,dsty,flags\n"); |
| |
| /* read frames from the file */ |
| while (av_read_frame(fmt_ctx, &pkt) >= 0) { |
| if (pkt.stream_index == video_stream_idx) |
| ret = decode_packet(&pkt); |
| av_packet_unref(&pkt); |
| if (ret < 0) |
| break; |
| } |
| |
| /* flush cached frames */ |
| decode_packet(NULL); |
| |
| end: |
| avcodec_free_context(&video_dec_ctx); |
| avformat_close_input(&fmt_ctx); |
| av_frame_free(&frame); |
| return ret < 0; |
| } |