Libav 0.7.1
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00001 /* 00002 * Copyright (c) 2007 Benoit Fouet 00003 * Copyright (c) 2010 Stefano Sabatini 00004 * 00005 * This file is part of Libav. 00006 * 00007 * Libav is free software; you can redistribute it and/or 00008 * modify it under the terms of the GNU Lesser General Public 00009 * License as published by the Free Software Foundation; either 00010 * version 2.1 of the License, or (at your option) any later version. 00011 * 00012 * Libav is distributed in the hope that it will be useful, 00013 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00015 * Lesser General Public License for more details. 00016 * 00017 * You should have received a copy of the GNU Lesser General Public 00018 * License along with Libav; if not, write to the Free Software 00019 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00020 */ 00021 00027 #include "avfilter.h" 00028 #include "libavutil/pixdesc.h" 00029 #include "libavutil/intreadwrite.h" 00030 #include "libavutil/imgutils.h" 00031 00032 typedef struct { 00033 int max_step[4]; 00034 int hsub, vsub; 00035 } FlipContext; 00036 00037 static int query_formats(AVFilterContext *ctx) 00038 { 00039 static const enum PixelFormat pix_fmts[] = { 00040 PIX_FMT_RGB48BE, PIX_FMT_RGB48LE, 00041 PIX_FMT_BGR48BE, PIX_FMT_BGR48LE, 00042 PIX_FMT_ARGB, PIX_FMT_RGBA, 00043 PIX_FMT_ABGR, PIX_FMT_BGRA, 00044 PIX_FMT_RGB24, PIX_FMT_BGR24, 00045 PIX_FMT_RGB565BE, PIX_FMT_RGB565LE, 00046 PIX_FMT_RGB555BE, PIX_FMT_RGB555LE, 00047 PIX_FMT_BGR565BE, PIX_FMT_BGR565LE, 00048 PIX_FMT_BGR555BE, PIX_FMT_BGR555LE, 00049 PIX_FMT_GRAY16BE, PIX_FMT_GRAY16LE, 00050 PIX_FMT_YUV420P16LE, PIX_FMT_YUV420P16BE, 00051 PIX_FMT_YUV422P16LE, PIX_FMT_YUV422P16BE, 00052 PIX_FMT_YUV444P16LE, PIX_FMT_YUV444P16BE, 00053 PIX_FMT_YUV444P, PIX_FMT_YUV422P, 00054 PIX_FMT_YUV420P, PIX_FMT_YUV411P, 00055 PIX_FMT_YUV410P, PIX_FMT_YUV440P, 00056 PIX_FMT_YUVJ444P, PIX_FMT_YUVJ422P, 00057 PIX_FMT_YUVJ420P, PIX_FMT_YUVJ440P, 00058 PIX_FMT_YUVA420P, 00059 PIX_FMT_RGB8, PIX_FMT_BGR8, 00060 PIX_FMT_RGB4_BYTE, PIX_FMT_BGR4_BYTE, 00061 PIX_FMT_PAL8, PIX_FMT_GRAY8, 00062 PIX_FMT_NONE 00063 }; 00064 00065 avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts)); 00066 return 0; 00067 } 00068 00069 static int config_props(AVFilterLink *inlink) 00070 { 00071 FlipContext *flip = inlink->dst->priv; 00072 const AVPixFmtDescriptor *pix_desc = &av_pix_fmt_descriptors[inlink->format]; 00073 00074 av_image_fill_max_pixsteps(flip->max_step, NULL, pix_desc); 00075 flip->hsub = av_pix_fmt_descriptors[inlink->format].log2_chroma_w; 00076 flip->vsub = av_pix_fmt_descriptors[inlink->format].log2_chroma_h; 00077 00078 return 0; 00079 } 00080 00081 static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir) 00082 { 00083 FlipContext *flip = inlink->dst->priv; 00084 AVFilterBufferRef *inpic = inlink->cur_buf; 00085 AVFilterBufferRef *outpic = inlink->dst->outputs[0]->out_buf; 00086 uint8_t *inrow, *outrow; 00087 int i, j, plane, step, hsub, vsub; 00088 00089 for (plane = 0; plane < 4 && inpic->data[plane]; plane++) { 00090 step = flip->max_step[plane]; 00091 hsub = (plane == 1 || plane == 2) ? flip->hsub : 0; 00092 vsub = (plane == 1 || plane == 2) ? flip->vsub : 0; 00093 00094 outrow = outpic->data[plane] + (y>>vsub) * outpic->linesize[plane]; 00095 inrow = inpic ->data[plane] + (y>>vsub) * inpic ->linesize[plane] + ((inlink->w >> hsub) - 1) * step; 00096 for (i = 0; i < h>>vsub; i++) { 00097 switch (step) { 00098 case 1: 00099 { 00100 for (j = 0; j < (inlink->w >> hsub); j++) 00101 outrow[j] = inrow[-j]; 00102 } 00103 break; 00104 00105 case 2: 00106 { 00107 uint16_t *outrow16 = (uint16_t *)outrow; 00108 uint16_t * inrow16 = (uint16_t *) inrow; 00109 for (j = 0; j < (inlink->w >> hsub); j++) 00110 outrow16[j] = inrow16[-j]; 00111 } 00112 break; 00113 00114 case 3: 00115 { 00116 uint8_t *in = inrow; 00117 uint8_t *out = outrow; 00118 for (j = 0; j < (inlink->w >> hsub); j++, out += 3, in -= 3) { 00119 int32_t v = AV_RB24(in); 00120 AV_WB24(out, v); 00121 } 00122 } 00123 break; 00124 00125 case 4: 00126 { 00127 uint32_t *outrow32 = (uint32_t *)outrow; 00128 uint32_t * inrow32 = (uint32_t *) inrow; 00129 for (j = 0; j < (inlink->w >> hsub); j++) 00130 outrow32[j] = inrow32[-j]; 00131 } 00132 break; 00133 00134 default: 00135 for (j = 0; j < (inlink->w >> hsub); j++) 00136 memcpy(outrow + j*step, inrow - j*step, step); 00137 } 00138 00139 inrow += inpic ->linesize[plane]; 00140 outrow += outpic->linesize[plane]; 00141 } 00142 } 00143 00144 avfilter_draw_slice(inlink->dst->outputs[0], y, h, slice_dir); 00145 } 00146 00147 AVFilter avfilter_vf_hflip = { 00148 .name = "hflip", 00149 .description = NULL_IF_CONFIG_SMALL("Horizontally flip the input video."), 00150 .priv_size = sizeof(FlipContext), 00151 .query_formats = query_formats, 00152 00153 .inputs = (AVFilterPad[]) {{ .name = "default", 00154 .type = AVMEDIA_TYPE_VIDEO, 00155 .draw_slice = draw_slice, 00156 .config_props = config_props, 00157 .min_perms = AV_PERM_READ, }, 00158 { .name = NULL}}, 00159 .outputs = (AVFilterPad[]) {{ .name = "default", 00160 .type = AVMEDIA_TYPE_VIDEO, }, 00161 { .name = NULL}}, 00162 };