Revision 9b61d838

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libavcodec/pixdesc.c
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/*
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 * Pixel Format descriptor
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 * Copyright (c) 2009 Michael Niedermayer <michaelni@gmx.at>
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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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#include "libavutil/pixfmt.h"
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#include "pixdesc.h"
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static const AVPixFmtDescriptor pix_fmt_desc[PIX_FMT_NB] = {
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    [PIX_FMT_YUV422P] = {
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        .nb_channels  = 3,
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        .log2_chroma_w= 1,
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        .log2_chroma_h= 0,
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        .comp = {
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            {0,0,1,0,7},
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            {1,0,1,0,7},
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            {2,0,1,0,7},
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        },
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    },
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    [PIX_FMT_YUV420P] = {
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        .nb_channels  = 3,
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        .log2_chroma_w= 1,
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        .log2_chroma_h= 1,
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        .comp = {
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            {0,0,1,0,7},
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            {1,0,1,0,7},
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            {2,0,1,0,7},
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        },
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    },
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    [PIX_FMT_YUV410P] = {
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        .nb_channels  = 3,
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        .log2_chroma_w= 2,
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        .log2_chroma_h= 2,
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        .comp = {
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            {0,0,1,0,7},
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            {1,0,1,0,7},
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            {2,0,1,0,7},
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        },
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    },
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    [PIX_FMT_NV12] = {
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        .nb_channels  = 3,
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        .log2_chroma_w= 1,
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        .log2_chroma_h= 1,
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        .comp = {
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            {0,0,1,0,7},
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            {1,1,1,0,7},
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            {1,1,2,0,7},
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        },
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    },
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    [PIX_FMT_YUYV422] = {
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        .nb_channels  = 3,
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        .log2_chroma_w= 1,
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        .log2_chroma_h= 0,
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        .comp = {
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            {0,1,1,0,7},
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            {0,3,2,0,7},
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            {0,3,4,0,7},
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        },
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    },
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    [PIX_FMT_UYVY422] = {
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        .nb_channels  = 3,
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        .log2_chroma_w= 1,
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        .log2_chroma_h= 0,
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        .comp = {
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            {0,1,2,0,7},
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            {0,3,1,0,7},
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            {0,3,3,0,7},
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        },
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    },
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    [PIX_FMT_GRAY16LE] = {
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        .nb_channels  = 1,
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        .log2_chroma_w= 0,
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        .log2_chroma_h= 0,
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        .comp = {
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            {0,1,1,0,15},
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        },
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    },
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    [PIX_FMT_GRAY16BE] = {
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        .nb_channels  = 1,
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        .log2_chroma_w= 0,
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        .log2_chroma_h= 0,
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        .comp = {
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            {0,1,1,0,15},
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        },
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        .flags = PIX_FMT_BE,
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    },
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    [PIX_FMT_RGB24] = {
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        .nb_channels  = 3,
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        .log2_chroma_w= 0,
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        .log2_chroma_h= 0,
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        .comp = {
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            {0,2,1,0,7},
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            {0,2,2,0,7},
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            {0,2,3,0,7},
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        },
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    },
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    [PIX_FMT_RGBA] = {
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        .nb_channels  = 4,
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        .log2_chroma_w= 0,
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        .log2_chroma_h= 0,
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        .comp = {
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            {0,3,1,0,7},
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            {0,3,2,0,7},
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            {0,3,3,0,7},
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            {0,3,4,0,7},
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        },
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    },
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    [PIX_FMT_RGB48LE] = {
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        .nb_channels  = 3,
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        .log2_chroma_w= 0,
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        .log2_chroma_h= 0,
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        .comp = {
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            {0,5,1,0,15},
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            {0,5,3,0,15},
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            {0,5,5,0,15},
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        },
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    },
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    [PIX_FMT_RGB48BE] = {
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        .nb_channels  = 3,
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        .log2_chroma_w= 0,
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        .log2_chroma_h= 0,
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        .comp = {
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            {0,5,1,0,15},
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            {0,5,3,0,15},
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            {0,5,5,0,15},
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        },
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        .flags = PIX_FMT_BE,
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    },
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//FIXME chaneg pix fmt defines so that we have a LE & BE instead of a Native endian
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#if 0
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    [PIX_FMT_RGB565_LE] = {
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        .nb_channels  = 3,
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        .log2_chroma_w= 0,
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        .log2_chroma_h= 0,
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        .comp = {
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            {0,1,1,0,4},
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            {0,1,1,5,5},
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            {0,1,2,3,4},
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        },
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    },
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    [PIX_FMT_RGB565_BE] = {
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        .nb_channels  = 3,
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        .log2_chroma_w= 0,
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        .log2_chroma_h= 0,
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        .comp = {
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            {0,1,1, 0,4},
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            {0,1,1, 5,5},
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            {0,1,0, 3,4},
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        },
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        .flags = PIX_FMT_BE,
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    },
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#endif
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    [PIX_FMT_MONOBLACK] = {
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        .nb_channels  = 1,
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        .log2_chroma_w= 0,
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        .log2_chroma_h= 0,
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        .comp = {
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            {0,0,1,7,0},
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        },
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        .flags = PIX_FMT_BITSTREAM,
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    },
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    [PIX_FMT_PAL8] = {
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        .nb_channels  = 1,
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        .log2_chroma_w= 0,
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        .log2_chroma_h= 0,
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        .comp = {
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            {0,0,1,0,7},
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        },
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        .flags = PIX_FMT_PAL,
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    },
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};
libavcodec/pixdesc.h
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/*
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 * Pixel Format descriptor
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 * Copyright (c) 2009 Michael Niedermayer <michaelni@gmx.at>
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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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#include <inttypes.h>
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#include "libavutil/intreadwrite.h"
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typedef struct AVComponentDescriptor{
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    uint16_t plane        :2;            ///< which of the 4 planes contains the component
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    uint16_t step_minus1  :3;            ///< number of bytes between 2 horizontally consecutive pixels minus 1
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    uint16_t offset_plus1 :3;            ///< number of bytes before the component of the first pixel plus 1
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    uint16_t shift        :3;            ///< number of lsb that must be shifted away to get the value
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    uint16_t depth_minus1 :4;            ///< number of bits in the component minus 1
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}AVComponentDescriptor;
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typedef struct AVPixFmtDescriptor{
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    uint8_t nb_channels;        ///< The number of components each pixel has, (1-4)
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    /**
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     * Amount to shift the luma width right to find the chroma width, this is for
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     * example 1 for YV12
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     * chroma_width = -((-luma_width )>>log2_chroma_w)
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     * note above is needed to ensure rounding up
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     */
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    uint8_t log2_chroma_w;      ///< chroma_width = -((-luma_width )>>log2_chroma_w)
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    /**
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     * Amount to shift the luma height right to find the chroma height, this is for
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     * example 1 for YV12
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     * chroma_height= -((-luma_height)>>log2_chroma_h)
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     * note above is needed to ensure rounding up
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     */
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    uint8_t log2_chroma_h;
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    uint8_t flags;
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    AVComponentDescriptor comp[4]; ///< parameters that describes how pixels are packed
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}AVPixFmtDescriptor;
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#define PIX_FMT_BE        1 ///< Big endian
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#define PIX_FMT_PAL       2 ///< Pixel format has a palette i data[1], values are indexes in this palette
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#define PIX_FMT_BITSTREAM 4 ///< All values of a component are bitwise packed end to end
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static inline void read_line(uint16_t *dst, const uint8_t *data[4], const int linesize[4], AVPixFmtDescriptor *desc, int x, int y, int c, int w)
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{
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    AVComponentDescriptor comp= desc->comp[c];
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    int plane= comp.plane;
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    int depth= comp.depth_minus1+1;
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    int mask = (1<<depth)-1;
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    int shift= comp.shift;
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    int step = comp.step_minus1+1;
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    int flags= desc->flags;
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    const uint8_t *p= data[plane]+y*linesize[plane] + x * step + comp.offset_plus1 - 1;
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    //FIXME initial x in case of PIX_FMT_BITSTREAM is wrong
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    while(w--){
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        int val;
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        if(flags & PIX_FMT_BE) val= AV_RB16(p);
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        else                   val= AV_RL16(p);
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        val = (val>>shift) & mask;
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        if(flags & PIX_FMT_PAL)
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            val= data[1][4*val + c];
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        if(flags & PIX_FMT_BITSTREAM){
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            shift-=depth;
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            while(shift<0){
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                shift+=8;
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                p++;
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            }
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        }else
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            p+= step;
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        *dst++= val;
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    }
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}

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