| /* |
| * 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 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 |
| */ |
| |
| #ifndef AVCODEC_VC1_COMMON_H |
| #define AVCODEC_VC1_COMMON_H |
| |
| #include <stdint.h> |
| |
| #include "libavutil/attributes.h" |
| #include "startcode.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) |
| { |
| if (end - src >= 4) { |
| uint32_t mrk = 0xFFFFFFFF; |
| src = avpriv_find_start_code(src, end, &mrk); |
| 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 */ |
