static int seek_test(const char *input_filename, const char *start, const char *end) { AVCodec *codec = NULL; AVCodecContext *ctx= NULL; AVCodecParameters *origin_par = NULL; AVFrame *fr = NULL; AVFormatContext *fmt_ctx = NULL; int video_stream; int result; int i, j; long int start_ts, end_ts; size_of_array = 0; number_of_elements = 0; crc_array = pts_array = NULL; result = avformat_open_input(&fmt_ctx, input_filename, NULL, NULL); if (result < 0) { av_log(NULL, AV_LOG_ERROR, "Can't open file\n"); return result; } result = avformat_find_stream_info(fmt_ctx, NULL); if (result < 0) { av_log(NULL, AV_LOG_ERROR, "Can't get stream info\n"); return result; } start_ts = read_seek_range(start); end_ts = read_seek_range(end); if ((start_ts < 0) || (end_ts < 0)) return -1; //TODO: add ability to work with audio format video_stream = av_find_best_stream(fmt_ctx, AVMEDIA_TYPE_VIDEO, -1, -1, NULL, 0); if (video_stream < 0) { av_log(NULL, AV_LOG_ERROR, "Can't find video stream in input file\n"); return -1; } origin_par = fmt_ctx->streams[video_stream]->codecpar; codec = avcodec_find_decoder(origin_par->codec_id); if (!codec) { av_log(NULL, AV_LOG_ERROR, "Can't find decoder\n"); return -1; } ctx = avcodec_alloc_context3(codec); if (!ctx) { av_log(NULL, AV_LOG_ERROR, "Can't allocate decoder context\n"); return AVERROR(ENOMEM); } result = avcodec_parameters_to_context(ctx, origin_par); if (result) { av_log(NULL, AV_LOG_ERROR, "Can't copy decoder context\n"); return result; } result = avcodec_open2(ctx, codec, NULL); if (result < 0) { av_log(ctx, AV_LOG_ERROR, "Can't open decoder\n"); return result; } fr = av_frame_alloc(); if (!fr) { av_log(NULL, AV_LOG_ERROR, "Can't allocate frame\n"); return AVERROR(ENOMEM); } result = compute_crc_of_packets(fmt_ctx, video_stream, ctx, fr, i, j, 1); if (result != 0) return -1; for (i = start_ts; i < end_ts; i += 100) { for (j = i + 100; j < end_ts; j += 100) result = compute_crc_of_packets(fmt_ctx, video_stream, ctx, fr, i, j, 0); if (result != 0) return -1; } av_freep(&crc_array); av_freep(&pts_array); av_frame_free(&fr); avcodec_close(ctx); avformat_close_input(&fmt_ctx); avcodec_free_context(&ctx); return 0; }