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1 : | edgomez | 467 | /***************************************************************************** |

2 : | * | ||

3 : | * XVID MPEG-4 VIDEO CODEC | ||

4 : | * - cbp function (zero block flags) - | ||

5 : | * | ||

6 : | edgomez | 742 | * Copyright (C) 2001-2002 - Edouard Gomez <ed.gomez@free.fr> |

7 : | edgomez | 467 | * |

8 : | edgomez | 655 | * This file is part of XviD, a free MPEG-4 video encoder/decoder |

9 : | edgomez | 467 | * |

10 : | edgomez | 655 | * XviD is free software; you can redistribute it and/or modify it |

11 : | * under the terms of the GNU General Public License as published by | ||

12 : | * the Free Software Foundation; either version 2 of the License, or | ||

13 : | edgomez | 467 | * (at your option) any later version. |

14 : | * | ||

15 : | * This program is distributed in the hope that it will be useful, | ||

16 : | edgomez | 655 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |

17 : | edgomez | 467 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |

18 : | * GNU General Public License for more details. | ||

19 : | * | ||

20 : | * You should have received a copy of the GNU General Public License | ||

21 : | edgomez | 655 | * along with this program; if not, write to the Free Software |

22 : | edgomez | 467 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |

23 : | * | ||

24 : | edgomez | 655 | * Under section 8 of the GNU General Public License, the copyright |

25 : | * holders of XVID explicitly forbid distribution in the following | ||

26 : | * countries: | ||

27 : | edgomez | 467 | * |

28 : | edgomez | 655 | * - Japan |

29 : | * - United States of America | ||

30 : | * | ||

31 : | * Linking XviD statically or dynamically with other modules is making a | ||

32 : | * combined work based on XviD. Thus, the terms and conditions of the | ||

33 : | * GNU General Public License cover the whole combination. | ||

34 : | * | ||

35 : | * As a special exception, the copyright holders of XviD give you | ||

36 : | * permission to link XviD with independent modules that communicate with | ||

37 : | * XviD solely through the VFW1.1 and DShow interfaces, regardless of the | ||

38 : | * license terms of these independent modules, and to copy and distribute | ||

39 : | * the resulting combined work under terms of your choice, provided that | ||

40 : | * every copy of the combined work is accompanied by a complete copy of | ||

41 : | * the source code of XviD (the version of XviD used to produce the | ||

42 : | * combined work), being distributed under the terms of the GNU General | ||

43 : | * Public License plus this exception. An independent module is a module | ||

44 : | * which is not derived from or based on XviD. | ||

45 : | * | ||

46 : | * Note that people who make modified versions of XviD are not obligated | ||

47 : | * to grant this special exception for their modified versions; it is | ||

48 : | * their choice whether to do so. The GNU General Public License gives | ||

49 : | * permission to release a modified version without this exception; this | ||

50 : | * exception also makes it possible to release a modified version which | ||

51 : | * carries forward this exception. | ||

52 : | * | ||

53 : | edgomez | 742 | * $Id: cbp.c,v 1.9 2002-12-28 13:53:08 edgomez Exp $ |

54 : | edgomez | 655 | * |

55 : | edgomez | 467 | ****************************************************************************/ |

56 : | |||

57 : | Isibaar | 3 | #include "../portab.h" |

58 : | #include "cbp.h" | ||

59 : | |||

60 : | edgomez | 467 | /***************************************************************************** |

61 : | * Global function pointer | ||

62 : | ****************************************************************************/ | ||

63 : | |||

64 : | Isibaar | 3 | cbpFuncPtr calc_cbp; |

65 : | |||

66 : | edgomez | 467 | /***************************************************************************** |

67 : | * Functions | ||

68 : | ****************************************************************************/ | ||

69 : | |||

70 : | edgomez | 46 | /* |

71 : | * Returns a field of bits that indicates non zero ac blocks | ||

72 : | * for this macro block | ||

73 : | */ | ||

74 : | edgomez | 195 | uint32_t |

75 : | calc_cbp_c(const int16_t codes[6 * 64]) | ||

76 : | Isibaar | 3 | { |

77 : | edgomez | 46 | uint32_t i, j; |

78 : | uint32_t cbp = 0; | ||

79 : | Isibaar | 3 | |

80 : | edgomez | 195 | for (i = 0; i < 6; i++) { |

81 : | for (j = 1; j < 61; j += 4) { | ||

82 : | if (codes[i * 64 + j] | codes[i * 64 + j + 1] | | ||

83 : | codes[i * 64 + j + 2] | codes[i * 64 + j + 3]) { | ||

84 : | Isibaar | 3 | cbp |= 1 << (5 - i); |

85 : | break; | ||

86 : | } | ||

87 : | } | ||

88 : | edgomez | 46 | |

89 : | edgomez | 195 | if (codes[i * 64 + j] | codes[i * 64 + j + 1] | codes[i * 64 + j + 2]) |

90 : | edgomez | 46 | cbp |= 1 << (5 - i); |

91 : | |||

92 : | } | ||

93 : | |||

94 : | return cbp; | ||

95 : | |||

96 : | Isibaar | 3 | } |

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