LCOV - code coverage report
Current view: top level - libavcodec - vc1_common.h (source / functions) Hit Total Coverage
Test: coverage.info Lines: 20 20 100.0 %
Date: 2017-12-13 02:34:56 Functions: 2 2 100.0 %

          Line data    Source code
       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        1007 : static av_always_inline const uint8_t* find_next_marker(const uint8_t *src, const uint8_t *end)
      60             : {
      61        1007 :     if (end - src >= 4) {
      62         937 :         uint32_t mrk = 0xFFFFFFFF;
      63         937 :         src = avpriv_find_start_code(src, end, &mrk);
      64         937 :         if (IS_MARKER(mrk))
      65         694 :             return src - 4;
      66             :     }
      67         313 :     return end;
      68             : }
      69             : 
      70         984 : static av_always_inline int vc1_unescape_buffer(const uint8_t *src, int size, uint8_t *dst)
      71             : {
      72         984 :     int dsize = 0, i;
      73             : 
      74         984 :     if (size < 4) {
      75         154 :         for (dsize = 0; dsize < size; dsize++)
      76          82 :             *dst++ = *src++;
      77          72 :         return size;
      78             :     }
      79     4537842 :     for (i = 0; i < size; i++, src++) {
      80     4536930 :         if (src[0] == 3 && i >= 2 && !src[-1] && !src[-2] && i < size-1 && src[1] < 4) {
      81          76 :             dst[dsize++] = src[1];
      82          76 :             src++;
      83          76 :             i++;
      84             :         } else
      85     4536854 :             dst[dsize++] = *src;
      86             :     }
      87         912 :     return dsize;
      88             : }
      89             : 
      90             : #endif /* AVCODEC_VC1_COMMON_H */

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