/* * RAW H.264 video demuxer * Copyright (c) 2008 Michael Niedermayer <michaelni@gmx.at> * * This file is part of FFmpeg. * * FFmpeg 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. * * FFmpeg 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 FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include "avformat.h" #include "rawdec.h" static int h264_probe(AVProbeData *p) { uint32_t code = -1; int sps = 0, pps = 0, idr = 0, res = 0, sli = 0; int i; for (i = 0; i < p->buf_size; i++) { code = (code << 8) + p->buf[i]; if ((code & 0xffffff00) == 0x100) { int ref_idc = (code >> 5) & 3; int type = code & 0x1F; static const int8_t ref_zero[] = { 2, 0, 0, 0, 0, -1, 1, -1, -1, 1, 1, 1, 1, -1, 2, 2, 2, 2, 2, 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2 }; if (code & 0x80) // forbidden_bit return 0; if (ref_zero[type] == 1 && ref_idc) return 0; if (ref_zero[type] == -1 && !ref_idc) return 0; if (ref_zero[type] == 2) res++; switch (type) { case 1: sli++; break; case 5: idr++; break; case 7: if (p->buf[i + 2] & 0x03) return 0; sps++; break; case 8: pps++; break; } } } if (sps && pps && (idr || sli > 3) && res < (sps + pps + idr)) return AVPROBE_SCORE_EXTENSION + 1; // 1 more than .mpg return 0; } FF_DEF_RAWVIDEO_DEMUXER(h264, "raw H.264 video", h264_probe, "h26l,h264,264,avc", AV_CODEC_ID_H264)