/* * VC-1 and WMV3 decoder * Copyright (c) 2006-2007 Konstantin Shishkov * Partly based on vc9.c (c) 2005 Anonymous, Alex Beregszaszi, Michael Niedermayer * * 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 */ #ifndef AVCODEC_VC1_COMMON_H #define AVCODEC_VC1_COMMON_H #include <stdint.h> #include "libavutil/attributes.h" /** Markers used in VC-1 AP frame data */ //@{ enum VC1Code { VC1_CODE_RES0 = 0x00000100, VC1_CODE_ENDOFSEQ = 0x0000010A, VC1_CODE_SLICE, VC1_CODE_FIELD, VC1_CODE_FRAME, VC1_CODE_ENTRYPOINT, VC1_CODE_SEQHDR, }; //@} #define IS_MARKER(x) (((x) & ~0xFF) == VC1_CODE_RES0) /** Available Profiles */ //@{ enum Profile { PROFILE_SIMPLE, PROFILE_MAIN, PROFILE_COMPLEX, ///< TODO: WMV9 specific PROFILE_ADVANCED }; //@} /** Find VC-1 marker in buffer * @return position where next marker starts or end of buffer if no marker found */ static av_always_inline const uint8_t* find_next_marker(const uint8_t *src, const uint8_t *end) { uint32_t mrk = 0xFFFFFFFF; if (end-src < 4) return end; while (src < end) { mrk = (mrk << 8) | *src++; if (IS_MARKER(mrk)) return src - 4; } return end; } static av_always_inline int vc1_unescape_buffer(const uint8_t *src, int size, uint8_t *dst) { int dsize = 0, i; if (size < 4) { for (dsize = 0; dsize < size; dsize++) *dst++ = *src++; return size; } for (i = 0; i < size; i++, src++) { if (src[0] == 3 && i >= 2 && !src[-1] && !src[-2] && i < size-1 && src[1] < 4) { dst[dsize++] = src[1]; src++; i++; } else dst[dsize++] = *src; } return dsize; } #endif /* AVCODEC_VC1_COMMON_H */