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| -rw-r--r-- | libavcodec/pixdesc.c | 187 | ||||
| -rw-r--r-- | libavcodec/pixdesc.h | 91 |
2 files changed, 278 insertions, 0 deletions
diff --git a/libavcodec/pixdesc.c b/libavcodec/pixdesc.c new file mode 100644 index 0000000000..7791fe6271 --- /dev/null +++ b/libavcodec/pixdesc.c @@ -0,0 +1,187 @@ +/* + * Pixel Format descriptor + * Copyright (c) 2009 Michael Niedermayer <michaelni@gmx.at> + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include "libavutil/pixfmt.h" +#include "pixdesc.h" + +static const AVPixFmtDescriptor pix_fmt_desc[PIX_FMT_NB] = { + [PIX_FMT_YUV422P] = { + .nb_channels = 3, + .log2_chroma_w= 1, + .log2_chroma_h= 0, + .comp = { + {0,0,1,0,7}, + {1,0,1,0,7}, + {2,0,1,0,7}, + }, + }, + [PIX_FMT_YUV420P] = { + .nb_channels = 3, + .log2_chroma_w= 1, + .log2_chroma_h= 1, + .comp = { + {0,0,1,0,7}, + {1,0,1,0,7}, + {2,0,1,0,7}, + }, + }, + [PIX_FMT_YUV410P] = { + .nb_channels = 3, + .log2_chroma_w= 2, + .log2_chroma_h= 2, + .comp = { + {0,0,1,0,7}, + {1,0,1,0,7}, + {2,0,1,0,7}, + }, + }, + [PIX_FMT_NV12] = { + .nb_channels = 3, + .log2_chroma_w= 1, + .log2_chroma_h= 1, + .comp = { + {0,0,1,0,7}, + {1,1,1,0,7}, + {1,1,2,0,7}, + }, + }, + [PIX_FMT_YUYV422] = { + .nb_channels = 3, + .log2_chroma_w= 1, + .log2_chroma_h= 0, + .comp = { + {0,1,1,0,7}, + {0,3,2,0,7}, + {0,3,4,0,7}, + }, + }, + [PIX_FMT_UYVY422] = { + .nb_channels = 3, + .log2_chroma_w= 1, + .log2_chroma_h= 0, + .comp = { + {0,1,2,0,7}, + {0,3,1,0,7}, + {0,3,3,0,7}, + }, + }, + [PIX_FMT_GRAY16LE] = { + .nb_channels = 1, + .log2_chroma_w= 0, + .log2_chroma_h= 0, + .comp = { + {0,1,1,0,15}, + }, + }, + [PIX_FMT_GRAY16BE] = { + .nb_channels = 1, + .log2_chroma_w= 0, + .log2_chroma_h= 0, + .comp = { + {0,1,1,0,15}, + }, + .flags = PIX_FMT_BE, + }, + [PIX_FMT_RGB24] = { + .nb_channels = 3, + .log2_chroma_w= 0, + .log2_chroma_h= 0, + .comp = { + {0,2,1,0,7}, + {0,2,2,0,7}, + {0,2,3,0,7}, + }, + }, + [PIX_FMT_RGBA] = { + .nb_channels = 4, + .log2_chroma_w= 0, + .log2_chroma_h= 0, + .comp = { + {0,3,1,0,7}, + {0,3,2,0,7}, + {0,3,3,0,7}, + {0,3,4,0,7}, + }, + }, + [PIX_FMT_RGB48LE] = { + .nb_channels = 3, + .log2_chroma_w= 0, + .log2_chroma_h= 0, + .comp = { + {0,5,1,0,15}, + {0,5,3,0,15}, + {0,5,5,0,15}, + }, + }, + [PIX_FMT_RGB48BE] = { + .nb_channels = 3, + .log2_chroma_w= 0, + .log2_chroma_h= 0, + .comp = { + {0,5,1,0,15}, + {0,5,3,0,15}, + {0,5,5,0,15}, + }, + .flags = PIX_FMT_BE, + }, +//FIXME chaneg pix fmt defines so that we have a LE & BE instead of a Native endian +#if 0 + [PIX_FMT_RGB565_LE] = { + .nb_channels = 3, + .log2_chroma_w= 0, + .log2_chroma_h= 0, + .comp = { + {0,1,1,0,4}, + {0,1,1,5,5}, + {0,1,2,3,4}, + }, + }, + [PIX_FMT_RGB565_BE] = { + .nb_channels = 3, + .log2_chroma_w= 0, + .log2_chroma_h= 0, + .comp = { + {0,1,1, 0,4}, + {0,1,1, 5,5}, + {0,1,0, 3,4}, + }, + .flags = PIX_FMT_BE, + }, +#endif + [PIX_FMT_MONOBLACK] = { + .nb_channels = 1, + .log2_chroma_w= 0, + .log2_chroma_h= 0, + .comp = { + {0,0,1,7,0}, + }, + .flags = PIX_FMT_BITSTREAM, + }, + [PIX_FMT_PAL8] = { + .nb_channels = 1, + .log2_chroma_w= 0, + .log2_chroma_h= 0, + .comp = { + {0,0,1,0,7}, + }, + .flags = PIX_FMT_PAL, + }, +}; diff --git a/libavcodec/pixdesc.h b/libavcodec/pixdesc.h new file mode 100644 index 0000000000..883ad5cd8c --- /dev/null +++ b/libavcodec/pixdesc.h @@ -0,0 +1,91 @@ +/* + * Pixel Format descriptor + * Copyright (c) 2009 Michael Niedermayer <michaelni@gmx.at> + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include <inttypes.h> + +#include "libavutil/intreadwrite.h" + +typedef struct AVComponentDescriptor{ + uint16_t plane :2; ///< which of the 4 planes contains the component + uint16_t step_minus1 :3; ///< number of bytes between 2 horizontally consecutive pixels minus 1 + uint16_t offset_plus1 :3; ///< number of bytes before the component of the first pixel plus 1 + uint16_t shift :3; ///< number of lsb that must be shifted away to get the value + uint16_t depth_minus1 :4; ///< number of bits in the component minus 1 +}AVComponentDescriptor; + +typedef struct AVPixFmtDescriptor{ + uint8_t nb_channels; ///< The number of components each pixel has, (1-4) + + /** + * Amount to shift the luma width right to find the chroma width, this is for + * example 1 for YV12 + * chroma_width = -((-luma_width )>>log2_chroma_w) + * note above is needed to ensure rounding up + */ + uint8_t log2_chroma_w; ///< chroma_width = -((-luma_width )>>log2_chroma_w) + + /** + * Amount to shift the luma height right to find the chroma height, this is for + * example 1 for YV12 + * chroma_height= -((-luma_height)>>log2_chroma_h) + * note above is needed to ensure rounding up + */ + uint8_t log2_chroma_h; + uint8_t flags; + AVComponentDescriptor comp[4]; ///< parameters that describes how pixels are packed +}AVPixFmtDescriptor; + +#define PIX_FMT_BE 1 ///< Big endian +#define PIX_FMT_PAL 2 ///< Pixel format has a palette i data[1], values are indexes in this palette +#define PIX_FMT_BITSTREAM 4 ///< All values of a component are bitwise packed end to end + + +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) +{ + AVComponentDescriptor comp= desc->comp[c]; + int plane= comp.plane; + int depth= comp.depth_minus1+1; + int mask = (1<<depth)-1; + int shift= comp.shift; + int step = comp.step_minus1+1; + int flags= desc->flags; + const uint8_t *p= data[plane]+y*linesize[plane] + x * step + comp.offset_plus1 - 1; + + //FIXME initial x in case of PIX_FMT_BITSTREAM is wrong + + while(w--){ + int val; + if(flags & PIX_FMT_BE) val= AV_RB16(p); + else val= AV_RL16(p); + val = (val>>shift) & mask; + if(flags & PIX_FMT_PAL) + val= data[1][4*val + c]; + if(flags & PIX_FMT_BITSTREAM){ + shift-=depth; + while(shift<0){ + shift+=8; + p++; + } + }else + p+= step; + *dst++= val; + } +} |