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  1. /*
  2.  * VC-1 and WMV3 decoder
  3.  * Copyright (c) 2006-2007 Konstantin Shishkov
  4.  * Partly based on vc9.c (c) 2005 Anonymous, Alex Beregszaszi, Michael Niedermayer
  5.  *
  6.  * This file is part of FFmpeg.
  7.  *
  8.  * FFmpeg is free software; you can redistribute it and/or
  9.  * modify it under the terms of the GNU Lesser General Public
  10.  * License as published by the Free Software Foundation; either
  11.  * version 2.1 of the License, or (at your option) any later version.
  12.  *
  13.  * FFmpeg is distributed in the hope that it will be useful,
  14.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16.  * Lesser General Public License for more details.
  17.  *
  18.  * You should have received a copy of the GNU Lesser General Public
  19.  * License along with FFmpeg; if not, write to the Free Software
  20.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21.  */
  22.  
  23. #ifndef AVCODEC_VC1_COMMON_H
  24. #define AVCODEC_VC1_COMMON_H
  25.  
  26. #include <stdint.h>
  27.  
  28. #include "libavutil/attributes.h"
  29. #include "internal.h"
  30.  
  31. /** Markers used in VC-1 AP frame data */
  32. //@{
  33. enum VC1Code {
  34.     VC1_CODE_RES0       = 0x00000100,
  35.     VC1_CODE_ENDOFSEQ   = 0x0000010A,
  36.     VC1_CODE_SLICE,
  37.     VC1_CODE_FIELD,
  38.     VC1_CODE_FRAME,
  39.     VC1_CODE_ENTRYPOINT,
  40.     VC1_CODE_SEQHDR,
  41. };
  42. //@}
  43.  
  44. #define IS_MARKER(x) (((x) & ~0xFF) == VC1_CODE_RES0)
  45.  
  46. /** Available Profiles */
  47. //@{
  48. enum Profile {
  49.     PROFILE_SIMPLE,
  50.     PROFILE_MAIN,
  51.     PROFILE_COMPLEX, ///< TODO: WMV9 specific
  52.     PROFILE_ADVANCED
  53. };
  54. //@}
  55.  
  56. /** Find VC-1 marker in buffer
  57.  * @return position where next marker starts or end of buffer if no marker found
  58.  */
  59. static av_always_inline const uint8_t* find_next_marker(const uint8_t *src, const uint8_t *end)
  60. {
  61.     if (end - src >= 4) {
  62.         uint32_t mrk = 0xFFFFFFFF;
  63.         src = avpriv_find_start_code(src, end, &mrk);
  64.         if (IS_MARKER(mrk))
  65.             return src - 4;
  66.     }
  67.     return end;
  68. }
  69.  
  70. static av_always_inline int vc1_unescape_buffer(const uint8_t *src, int size, uint8_t *dst)
  71. {
  72.     int dsize = 0, i;
  73.  
  74.     if (size < 4) {
  75.         for (dsize = 0; dsize < size; dsize++)
  76.             *dst++ = *src++;
  77.         return size;
  78.     }
  79.     for (i = 0; i < size; i++, src++) {
  80.         if (src[0] == 3 && i >= 2 && !src[-1] && !src[-2] && i < size-1 && src[1] < 4) {
  81.             dst[dsize++] = src[1];
  82.             src++;
  83.             i++;
  84.         } else
  85.             dst[dsize++] = *src;
  86.     }
  87.     return dsize;
  88. }
  89.  
  90. #endif /* AVCODEC_VC1_COMMON_H */
  91.