/* * copyright (c) 2009 Michael Niedermayer <michaelni@gmx.at> * * This file is part of Libav. * * Libav is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * Libav is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include <stdlib.h> #include "libavformat/avformat.h" #include "libavcodec/put_bits.h" #include "libavutil/lfg.h" static int score_array[1000]; //this must be larger than the number of formats static int failures = 0; static void probe(AVProbeData *pd, int type, int p, int size) { int i = 0; AVInputFormat *fmt = NULL; while ((fmt = av_iformat_next(fmt))) { if (fmt->flags & AVFMT_NOFILE) continue; if (fmt->read_probe) { int score = fmt->read_probe(pd); if (score > score_array[i] && score > AVPROBE_SCORE_MAX / 4) { score_array[i] = score; fprintf(stderr, "Failure of %s probing code with score=%d type=%d p=%X size=%d\n", fmt->name, score, type, p, size); failures++; } } i++; } } int main(void) { unsigned int p, i, type, size, retry; AVProbeData pd; AVLFG state; PutBitContext pb; avcodec_register_all(); av_register_all(); av_lfg_init(&state, 0xdeadbeef); pd.buf = NULL; for (size = 1; size < 65537; size *= 2) { pd.buf_size = size; pd.buf = av_realloc(pd.buf, size + AVPROBE_PADDING_SIZE); pd.filename = ""; fprintf(stderr, "testing size=%d\n", size); for (retry = 0; retry < 4097; retry += FFMAX(size, 32)) { for (type = 0; type < 4; type++) { for (p = 0; p < 4096; p++) { unsigned hist = 0; init_put_bits(&pb, pd.buf, size); switch (type) { case 0: for (i = 0; i < size * 8; i++) { put_bits(&pb, 1, (av_lfg_get(&state) & 0xFFFFFFFF) > p << 20); } break; case 1: for (i = 0; i < size * 8; i++) { unsigned int p2 = hist ? p & 0x3F : (p >> 6); unsigned int v = (av_lfg_get(&state) & 0xFFFFFFFF) > p2 << 26; put_bits(&pb, 1, v); hist = v; } break; case 2: for (i = 0; i < size * 8; i++) { unsigned int p2 = (p >> (hist*3)) & 7; unsigned int v = (av_lfg_get(&state) & 0xFFFFFFFF) > p2 << 29; put_bits(&pb, 1, v); hist = (2*hist + v) & 3; } break; case 3: for (i = 0; i < size; i++) { int c = 0; while (p & 63) { c = (av_lfg_get(&state) & 0xFFFFFFFF) >> 24; if (c >= 'a' && c <= 'z' && (p & 1)) break; else if(c >= 'A' && c <= 'Z' && (p & 2)) break; else if(c >= '0' && c <= '9' && (p & 4)) break; else if(c == ' ' && (p & 8)) break; else if(c == 0 && (p & 16)) break; else if(c == 1 && (p & 32)) break; } pd.buf[i] = c; } } flush_put_bits(&pb); probe(&pd, type, p, size); } } } } return failures; }