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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_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_RGB444BE, PIX_FMT_RGB444LE,
00048 PIX_FMT_BGR565BE, PIX_FMT_BGR565LE,
00049 PIX_FMT_BGR555BE, PIX_FMT_BGR555LE,
00050 PIX_FMT_BGR444BE, PIX_FMT_BGR444LE,
00051 PIX_FMT_GRAY16BE, PIX_FMT_GRAY16LE,
00052 PIX_FMT_YUV420P16LE, PIX_FMT_YUV420P16BE,
00053 PIX_FMT_YUV422P16LE, PIX_FMT_YUV422P16BE,
00054 PIX_FMT_YUV444P16LE, PIX_FMT_YUV444P16BE,
00055 PIX_FMT_YUV444P, PIX_FMT_YUV422P,
00056 PIX_FMT_YUV420P, PIX_FMT_YUV411P,
00057 PIX_FMT_YUV410P, PIX_FMT_YUV440P,
00058 PIX_FMT_YUVJ444P, PIX_FMT_YUVJ422P,
00059 PIX_FMT_YUVJ420P, PIX_FMT_YUVJ440P,
00060 PIX_FMT_YUVA420P,
00061 PIX_FMT_RGB8, PIX_FMT_BGR8,
00062 PIX_FMT_RGB4_BYTE, PIX_FMT_BGR4_BYTE,
00063 PIX_FMT_PAL8, PIX_FMT_GRAY8,
00064 PIX_FMT_NONE
00065 };
00066
00067 avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));
00068 return 0;
00069 }
00070
00071 static int config_props(AVFilterLink *inlink)
00072 {
00073 FlipContext *flip = inlink->dst->priv;
00074 const AVPixFmtDescriptor *pix_desc = &av_pix_fmt_descriptors[inlink->format];
00075
00076 av_image_fill_max_pixsteps(flip->max_step, NULL, pix_desc);
00077 flip->hsub = av_pix_fmt_descriptors[inlink->format].log2_chroma_w;
00078 flip->vsub = av_pix_fmt_descriptors[inlink->format].log2_chroma_h;
00079
00080 return 0;
00081 }
00082
00083 static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
00084 {
00085 AVFilterLink *outlink = inlink->dst->outputs[0];
00086
00087 outlink->out_buf =
00088 avfilter_get_video_buffer(outlink, AV_PERM_WRITE, outlink->w, outlink->h);
00089 avfilter_copy_buffer_ref_props(outlink->out_buf, picref);
00090
00091
00092 if (av_pix_fmt_descriptors[inlink->format].flags & PIX_FMT_PAL)
00093 memcpy(inlink->dst->outputs[0]->out_buf->data[1], picref->data[1], AVPALETTE_SIZE);
00094
00095 avfilter_start_frame(outlink, avfilter_ref_buffer(outlink->out_buf, ~0));
00096 }
00097
00098 static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
00099 {
00100 FlipContext *flip = inlink->dst->priv;
00101 AVFilterBufferRef *inpic = inlink->cur_buf;
00102 AVFilterBufferRef *outpic = inlink->dst->outputs[0]->out_buf;
00103 uint8_t *inrow, *outrow;
00104 int i, j, plane, step, hsub, vsub;
00105
00106 for (plane = 0; plane < 4 && inpic->data[plane]; plane++) {
00107 step = flip->max_step[plane];
00108 hsub = (plane == 1 || plane == 2) ? flip->hsub : 0;
00109 vsub = (plane == 1 || plane == 2) ? flip->vsub : 0;
00110
00111 outrow = outpic->data[plane] + (y>>vsub) * outpic->linesize[plane];
00112 inrow = inpic ->data[plane] + (y>>vsub) * inpic ->linesize[plane] + ((inlink->w >> hsub) - 1) * step;
00113 for (i = 0; i < h>>vsub; i++) {
00114 switch (step) {
00115 case 1:
00116 for (j = 0; j < (inlink->w >> hsub); j++)
00117 outrow[j] = inrow[-j];
00118 break;
00119
00120 case 2:
00121 {
00122 uint16_t *outrow16 = (uint16_t *)outrow;
00123 uint16_t * inrow16 = (uint16_t *) inrow;
00124 for (j = 0; j < (inlink->w >> hsub); j++)
00125 outrow16[j] = inrow16[-j];
00126 }
00127 break;
00128
00129 case 3:
00130 {
00131 uint8_t *in = inrow;
00132 uint8_t *out = outrow;
00133 for (j = 0; j < (inlink->w >> hsub); j++, out += 3, in -= 3) {
00134 int32_t v = AV_RB24(in);
00135 AV_WB24(out, v);
00136 }
00137 }
00138 break;
00139
00140 case 4:
00141 {
00142 uint32_t *outrow32 = (uint32_t *)outrow;
00143 uint32_t * inrow32 = (uint32_t *) inrow;
00144 for (j = 0; j < (inlink->w >> hsub); j++)
00145 outrow32[j] = inrow32[-j];
00146 }
00147 break;
00148
00149 default:
00150 for (j = 0; j < (inlink->w >> hsub); j++)
00151 memcpy(outrow + j*step, inrow - j*step, step);
00152 }
00153
00154 inrow += inpic ->linesize[plane];
00155 outrow += outpic->linesize[plane];
00156 }
00157 }
00158
00159 avfilter_draw_slice(inlink->dst->outputs[0], y, h, slice_dir);
00160 }
00161
00162 AVFilter avfilter_vf_hflip = {
00163 .name = "hflip",
00164 .description = NULL_IF_CONFIG_SMALL("Horizontally flip the input video."),
00165 .priv_size = sizeof(FlipContext),
00166 .query_formats = query_formats,
00167
00168 .inputs = (const AVFilterPad[]) {{ .name = "default",
00169 .type = AVMEDIA_TYPE_VIDEO,
00170 .start_frame = start_frame,
00171 .draw_slice = draw_slice,
00172 .config_props = config_props,
00173 .min_perms = AV_PERM_READ, },
00174 { .name = NULL}},
00175 .outputs = (const AVFilterPad[]) {{ .name = "default",
00176 .type = AVMEDIA_TYPE_VIDEO, },
00177 { .name = NULL}},
00178 };