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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_ARGB, PIX_FMT_RGBA,
00042 PIX_FMT_ABGR, PIX_FMT_BGRA,
00043 PIX_FMT_RGB24, PIX_FMT_BGR24,
00044 PIX_FMT_RGB565BE, PIX_FMT_RGB565LE,
00045 PIX_FMT_RGB555BE, PIX_FMT_RGB555LE,
00046 PIX_FMT_BGR565BE, PIX_FMT_BGR565LE,
00047 PIX_FMT_BGR555BE, PIX_FMT_BGR555LE,
00048 PIX_FMT_GRAY16BE, PIX_FMT_GRAY16LE,
00049 PIX_FMT_YUV420P16LE, PIX_FMT_YUV420P16BE,
00050 PIX_FMT_YUV422P16LE, PIX_FMT_YUV422P16BE,
00051 PIX_FMT_YUV444P16LE, PIX_FMT_YUV444P16BE,
00052 PIX_FMT_YUV444P, PIX_FMT_YUV422P,
00053 PIX_FMT_YUV420P, PIX_FMT_YUV411P,
00054 PIX_FMT_YUV410P, PIX_FMT_YUV440P,
00055 PIX_FMT_YUVJ444P, PIX_FMT_YUVJ422P,
00056 PIX_FMT_YUVJ420P, PIX_FMT_YUVJ440P,
00057 PIX_FMT_YUVA420P,
00058 PIX_FMT_RGB8, PIX_FMT_BGR8,
00059 PIX_FMT_RGB4_BYTE, PIX_FMT_BGR4_BYTE,
00060 PIX_FMT_PAL8, PIX_FMT_GRAY8,
00061 PIX_FMT_NONE
00062 };
00063
00064 avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts));
00065 return 0;
00066 }
00067
00068 static int config_props(AVFilterLink *inlink)
00069 {
00070 FlipContext *flip = inlink->dst->priv;
00071 const AVPixFmtDescriptor *pix_desc = &av_pix_fmt_descriptors[inlink->format];
00072
00073 av_image_fill_max_pixsteps(flip->max_step, NULL, pix_desc);
00074 flip->hsub = av_pix_fmt_descriptors[inlink->format].log2_chroma_w;
00075 flip->vsub = av_pix_fmt_descriptors[inlink->format].log2_chroma_h;
00076
00077 return 0;
00078 }
00079
00080 static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
00081 {
00082 FlipContext *flip = inlink->dst->priv;
00083 AVFilterBufferRef *inpic = inlink->cur_buf;
00084 AVFilterBufferRef *outpic = inlink->dst->outputs[0]->out_buf;
00085 uint8_t *inrow, *outrow;
00086 int i, j, plane, step, hsub, vsub;
00087
00088 for (plane = 0; plane < 4 && inpic->data[plane]; plane++) {
00089 step = flip->max_step[plane];
00090 hsub = (plane == 1 || plane == 2) ? flip->hsub : 0;
00091 vsub = (plane == 1 || plane == 2) ? flip->vsub : 0;
00092
00093 outrow = outpic->data[plane] + (y>>vsub) * outpic->linesize[plane];
00094 inrow = inpic ->data[plane] + (y>>vsub) * inpic ->linesize[plane] + ((inlink->w >> hsub) - 1) * step;
00095 for (i = 0; i < h>>vsub; i++) {
00096 switch (step) {
00097 case 1:
00098 {
00099 for (j = 0; j < (inlink->w >> hsub); j++)
00100 outrow[j] = inrow[-j];
00101 }
00102 break;
00103
00104 case 2:
00105 {
00106 uint16_t *outrow16 = (uint16_t *)outrow;
00107 uint16_t * inrow16 = (uint16_t *) inrow;
00108 for (j = 0; j < (inlink->w >> hsub); j++)
00109 outrow16[j] = inrow16[-j];
00110 }
00111 break;
00112
00113 case 3:
00114 {
00115 uint8_t *in = inrow;
00116 uint8_t *out = outrow;
00117 for (j = 0; j < (inlink->w >> hsub); j++, out += 3, in -= 3) {
00118 int32_t v = AV_RB24(in);
00119 AV_WB24(out, v);
00120 }
00121 }
00122 break;
00123
00124 case 4:
00125 {
00126 uint32_t *outrow32 = (uint32_t *)outrow;
00127 uint32_t * inrow32 = (uint32_t *) inrow;
00128 for (j = 0; j < (inlink->w >> hsub); j++)
00129 outrow32[j] = inrow32[-j];
00130 }
00131 break;
00132
00133 default:
00134 for (j = 0; j < (inlink->w >> hsub); j++)
00135 memcpy(outrow + j*step, inrow - j*step, step);
00136 }
00137
00138 inrow += inpic ->linesize[plane];
00139 outrow += outpic->linesize[plane];
00140 }
00141 }
00142
00143 avfilter_draw_slice(inlink->dst->outputs[0], y, h, slice_dir);
00144 }
00145
00146 AVFilter avfilter_vf_hflip = {
00147 .name = "hflip",
00148 .description = NULL_IF_CONFIG_SMALL("Horizontally flip the input video."),
00149 .priv_size = sizeof(FlipContext),
00150 .query_formats = query_formats,
00151
00152 .inputs = (AVFilterPad[]) {{ .name = "default",
00153 .type = AVMEDIA_TYPE_VIDEO,
00154 .draw_slice = draw_slice,
00155 .config_props = config_props,
00156 .min_perms = AV_PERM_READ, },
00157 { .name = NULL}},
00158 .outputs = (AVFilterPad[]) {{ .name = "default",
00159 .type = AVMEDIA_TYPE_VIDEO, },
00160 { .name = NULL}},
00161 };