mirror of https://github.com/FFmpeg/FFmpeg.git
The reasoning behind this addition is that various third party applications are interested in getting some motion information out of a video "for free" when it is available. It was considered to export other information as well (such as the intra information about the block, or the quantization) but the structure might have ended up into a half full-generic, half full of codec specific cruft. If more information is necessary, it should either be added in the "flags" field of the AVMotionVector structure, or in another side-data. This commit also includes an example exporting them in a CSV stream.pull/81/head
Clément Bœsch
10 years ago
parent
c5f43c8888
commit
b0352b1997
15 changed files with 360 additions and 2 deletions
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/*
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* Copyright (c) 2012 Stefano Sabatini |
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* Copyright (c) 2014 Clément Bœsch |
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* |
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* Permission is hereby granted, free of charge, to any person obtaining a copy |
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* of this software and associated documentation files (the "Software"), to deal |
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* in the Software without restriction, including without limitation the rights |
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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* copies of the Software, and to permit persons to whom the Software is |
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* furnished to do so, subject to the following conditions: |
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* |
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* The above copyright notice and this permission notice shall be included in |
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* all copies or substantial portions of the Software. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
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* THE SOFTWARE. |
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*/ |
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#include <libavutil/motion_vector.h> |
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#include <libavformat/avformat.h> |
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static AVFormatContext *fmt_ctx = NULL; |
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static AVCodecContext *video_dec_ctx = NULL; |
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static AVStream *video_stream = NULL; |
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static const char *src_filename = NULL; |
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static int video_stream_idx = -1; |
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static AVFrame *frame = NULL; |
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static AVPacket pkt; |
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static int video_frame_count = 0; |
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static int decode_packet(int *got_frame, int cached) |
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{ |
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int decoded = pkt.size; |
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*got_frame = 0; |
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if (pkt.stream_index == video_stream_idx) { |
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int ret = avcodec_decode_video2(video_dec_ctx, frame, got_frame, &pkt); |
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if (ret < 0) { |
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fprintf(stderr, "Error decoding video frame (%s)\n", av_err2str(ret)); |
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return ret; |
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} |
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if (*got_frame) { |
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int i; |
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AVFrameSideData *sd; |
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video_frame_count++; |
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sd = av_frame_get_side_data(frame, AV_FRAME_DATA_MOTION_VECTORS); |
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if (sd) { |
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const AVMotionVector *mvs = (const AVMotionVector *)sd->data; |
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for (i = 0; i < sd->size / sizeof(*mvs); i++) { |
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const AVMotionVector *mv = &mvs[i]; |
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printf("%d,%2d,%2d,%2d,%4d,%4d,%4d,%4d,0x%"PRIx64"\n", |
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video_frame_count, mv->source, |
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mv->w, mv->h, mv->src_x, mv->src_y, |
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mv->dst_x, mv->dst_y, mv->flags); |
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} |
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} |
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} |
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} |
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return decoded; |
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} |
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static int open_codec_context(int *stream_idx, |
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AVFormatContext *fmt_ctx, enum AVMediaType type) |
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{ |
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int ret; |
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AVStream *st; |
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AVCodecContext *dec_ctx = NULL; |
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AVCodec *dec = NULL; |
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AVDictionary *opts = NULL; |
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ret = av_find_best_stream(fmt_ctx, type, -1, -1, NULL, 0); |
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if (ret < 0) { |
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fprintf(stderr, "Could not find %s stream in input file '%s'\n", |
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av_get_media_type_string(type), src_filename); |
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return ret; |
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} else { |
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*stream_idx = ret; |
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st = fmt_ctx->streams[*stream_idx]; |
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/* find decoder for the stream */ |
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dec_ctx = st->codec; |
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dec = avcodec_find_decoder(dec_ctx->codec_id); |
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if (!dec) { |
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fprintf(stderr, "Failed to find %s codec\n", |
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av_get_media_type_string(type)); |
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return AVERROR(EINVAL); |
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} |
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/* Init the video decoder */ |
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av_dict_set(&opts, "flags2", "+export_mvs", 0); |
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if ((ret = avcodec_open2(dec_ctx, dec, &opts)) < 0) { |
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fprintf(stderr, "Failed to open %s codec\n", |
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av_get_media_type_string(type)); |
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return ret; |
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} |
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} |
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return 0; |
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} |
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int main(int argc, char **argv) |
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{ |
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int ret = 0, got_frame; |
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if (argc != 2) { |
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fprintf(stderr, "Usage: %s <video>\n", argv[0]); |
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exit(1); |
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} |
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src_filename = argv[1]; |
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av_register_all(); |
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if (avformat_open_input(&fmt_ctx, src_filename, NULL, NULL) < 0) { |
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fprintf(stderr, "Could not open source file %s\n", src_filename); |
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exit(1); |
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} |
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if (avformat_find_stream_info(fmt_ctx, NULL) < 0) { |
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fprintf(stderr, "Could not find stream information\n"); |
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exit(1); |
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} |
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if (open_codec_context(&video_stream_idx, fmt_ctx, AVMEDIA_TYPE_VIDEO) >= 0) { |
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video_stream = fmt_ctx->streams[video_stream_idx]; |
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video_dec_ctx = video_stream->codec; |
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} |
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av_dump_format(fmt_ctx, 0, src_filename, 0); |
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if (!video_stream) { |
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fprintf(stderr, "Could not find video stream in the input, aborting\n"); |
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ret = 1; |
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goto end; |
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} |
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frame = av_frame_alloc(); |
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if (!frame) { |
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fprintf(stderr, "Could not allocate frame\n"); |
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ret = AVERROR(ENOMEM); |
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goto end; |
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} |
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printf("framenum,source,blockw,blockh,srcx,srcy,dstx,dsty,flags\n"); |
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/* initialize packet, set data to NULL, let the demuxer fill it */ |
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av_init_packet(&pkt); |
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pkt.data = NULL; |
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pkt.size = 0; |
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/* read frames from the file */ |
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while (av_read_frame(fmt_ctx, &pkt) >= 0) { |
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AVPacket orig_pkt = pkt; |
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do { |
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ret = decode_packet(&got_frame, 0); |
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if (ret < 0) |
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break; |
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pkt.data += ret; |
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pkt.size -= ret; |
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} while (pkt.size > 0); |
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av_free_packet(&orig_pkt); |
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} |
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/* flush cached frames */ |
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pkt.data = NULL; |
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pkt.size = 0; |
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do { |
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decode_packet(&got_frame, 1); |
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} while (got_frame); |
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end: |
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avcodec_close(video_dec_ctx); |
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avformat_close_input(&fmt_ctx); |
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av_frame_free(&frame); |
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return ret < 0; |
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} |
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@ -0,0 +1,50 @@ |
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/*
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#ifndef AVUTIL_MOTION_VECTOR_H |
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#define AVUTIL_MOTION_VECTOR_H |
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#include <stdint.h> |
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typedef struct AVMotionVector { |
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/**
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* Where the current macroblock comes from; negative value when it comes |
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* from the past, positive value when it comes from the future. |
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* XXX: set exact relative ref frame reference instead of a +/- 1 "direction". |
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*/ |
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int32_t source; |
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/**
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* Width and height of the block. |
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*/ |
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uint8_t w, h; |
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/**
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* Absolute source position. |
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*/ |
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uint16_t src_x, src_y; |
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/**
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* Absolute destination position. |
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*/ |
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uint16_t dst_x, dst_y; |
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/**
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* Extra flag information. |
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* Currently unused. |
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*/ |
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uint64_t flags; |
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} AVMotionVector; |
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#endif /* AVUTIL_MOTION_VECTOR_H */ |
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