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/* |
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* VC-1 and WMV3 decoder |
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* Copyright (c) 2006-2007 Konstantin Shishkov |
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* Partly based on vc9.c (c) 2005 Anonymous, Alex Beregszaszi, Michael Niedermayer |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#ifndef AVCODEC_VC1_COMMON_H |
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#define AVCODEC_VC1_COMMON_H |
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#include <stdint.h> |
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#include "libavutil/attributes.h" |
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#include "internal.h" |
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/** Markers used in VC-1 AP frame data */ |
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//@{ |
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enum VC1Code { |
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VC1_CODE_RES0 = 0x00000100, |
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VC1_CODE_ENDOFSEQ = 0x0000010A, |
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VC1_CODE_SLICE, |
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VC1_CODE_FIELD, |
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VC1_CODE_FRAME, |
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VC1_CODE_ENTRYPOINT, |
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VC1_CODE_SEQHDR, |
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}; |
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//@} |
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#define IS_MARKER(x) (((x) & ~0xFF) == VC1_CODE_RES0) |
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/** Available Profiles */ |
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//@{ |
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enum Profile { |
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PROFILE_SIMPLE, |
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PROFILE_MAIN, |
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PROFILE_COMPLEX, ///< TODO: WMV9 specific |
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PROFILE_ADVANCED |
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}; |
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//@} |
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/** Find VC-1 marker in buffer |
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* @return position where next marker starts or end of buffer if no marker found |
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*/ |
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static av_always_inline const uint8_t* find_next_marker(const uint8_t *src, const uint8_t *end) |
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{ |
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✓✓ |
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if (end - src >= 4) { |
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uint32_t mrk = 0xFFFFFFFF; |
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src = avpriv_find_start_code(src, end, &mrk); |
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✓✓ |
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if (IS_MARKER(mrk)) |
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return src - 4; |
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} |
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return end; |
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} |
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static av_always_inline int vc1_unescape_buffer(const uint8_t *src, int size, uint8_t *dst) |
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{ |
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int dsize = 0, i; |
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✓✓ |
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if (size < 4) { |
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✓✓ |
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for (dsize = 0; dsize < size; dsize++) |
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*dst++ = *src++; |
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return size; |
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} |
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✓✓ |
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for (i = 0; i < size; i++, src++) { |
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✓✓✓✓
✓✓✓✓
✓✗✓✗
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if (src[0] == 3 && i >= 2 && !src[-1] && !src[-2] && i < size-1 && src[1] < 4) { |
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dst[dsize++] = src[1]; |
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src++; |
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i++; |
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} else |
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dst[dsize++] = *src; |
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} |
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return dsize; |
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} |
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#endif /* AVCODEC_VC1_COMMON_H */ |