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libavfilter/vf_transpose.c

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00001 /*
00002  * Copyright (c) 2010 Stefano Sabatini
00003  * Copyright (c) 2008 Vitor Sessak
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg 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  * FFmpeg 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 FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00028 #include "libavutil/intreadwrite.h"
00029 #include "libavutil/pixdesc.h"
00030 #include "libavutil/imgutils.h"
00031 #include "avfilter.h"
00032 
00033 typedef struct {
00034     int hsub, vsub;
00035     int pixsteps[4];
00036 
00037     /* 0    Rotate by 90 degrees counterclockwise and vflip. */
00038     /* 1    Rotate by 90 degrees clockwise.                  */
00039     /* 2    Rotate by 90 degrees counterclockwise.           */
00040     /* 3    Rotate by 90 degrees clockwise and vflip.        */
00041     int dir;
00042 } TransContext;
00043 
00044 static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
00045 {
00046     TransContext *trans = ctx->priv;
00047     trans->dir = 0;
00048 
00049     if (args)
00050         sscanf(args, "%d", &trans->dir);
00051 
00052     if (trans->dir < 0 || trans->dir > 3) {
00053         av_log(ctx, AV_LOG_ERROR, "Invalid value %d not between 0 and 3.\n",
00054                trans->dir);
00055         return AVERROR(EINVAL);
00056     }
00057     return 0;
00058 }
00059 
00060 static int query_formats(AVFilterContext *ctx)
00061 {
00062     enum PixelFormat pix_fmts[] = {
00063         PIX_FMT_ARGB,         PIX_FMT_RGBA,
00064         PIX_FMT_ABGR,         PIX_FMT_BGRA,
00065         PIX_FMT_RGB24,        PIX_FMT_BGR24,
00066         PIX_FMT_RGB565BE,     PIX_FMT_RGB565LE,
00067         PIX_FMT_RGB555BE,     PIX_FMT_RGB555LE,
00068         PIX_FMT_BGR565BE,     PIX_FMT_BGR565LE,
00069         PIX_FMT_BGR555BE,     PIX_FMT_BGR555LE,
00070         PIX_FMT_GRAY16BE,     PIX_FMT_GRAY16LE,
00071         PIX_FMT_YUV420P16LE,  PIX_FMT_YUV420P16BE,
00072         PIX_FMT_YUV444P16LE,  PIX_FMT_YUV444P16BE,
00073         PIX_FMT_NV12,         PIX_FMT_NV21,
00074         PIX_FMT_RGB8,         PIX_FMT_BGR8,
00075         PIX_FMT_RGB4_BYTE,    PIX_FMT_BGR4_BYTE,
00076         PIX_FMT_YUV444P,      PIX_FMT_YUVJ444P,
00077         PIX_FMT_YUV420P,      PIX_FMT_YUVJ420P,
00078         PIX_FMT_YUV410P,
00079         PIX_FMT_YUVA420P,     PIX_FMT_GRAY8,
00080         PIX_FMT_NONE
00081     };
00082 
00083     avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));
00084     return 0;
00085 }
00086 
00087 static int config_props_output(AVFilterLink *outlink)
00088 {
00089     AVFilterContext *ctx = outlink->src;
00090     TransContext *trans = ctx->priv;
00091     AVFilterLink *inlink = ctx->inputs[0];
00092     const AVPixFmtDescriptor *pixdesc = &av_pix_fmt_descriptors[outlink->format];
00093 
00094     trans->hsub = av_pix_fmt_descriptors[inlink->format].log2_chroma_w;
00095     trans->vsub = av_pix_fmt_descriptors[inlink->format].log2_chroma_h;
00096 
00097     av_image_fill_max_pixsteps(trans->pixsteps, NULL, pixdesc);
00098 
00099     outlink->w = inlink->h;
00100     outlink->h = inlink->w;
00101 
00102     if (inlink->sample_aspect_ratio.num){
00103         outlink->sample_aspect_ratio = av_div_q((AVRational){1,1}, inlink->sample_aspect_ratio);
00104     } else
00105         outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;
00106 
00107     av_log(ctx, AV_LOG_INFO, "w:%d h:%d dir:%d -> w:%d h:%d rotation:%s vflip:%d\n",
00108            inlink->w, inlink->h, trans->dir, outlink->w, outlink->h,
00109            trans->dir == 1 || trans->dir == 3 ? "clockwise" : "counterclockwise",
00110            trans->dir == 0 || trans->dir == 3);
00111     return 0;
00112 }
00113 
00114 static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
00115 {
00116     AVFilterLink *outlink = inlink->dst->outputs[0];
00117 
00118     outlink->out_buf = avfilter_get_video_buffer(outlink, AV_PERM_WRITE,
00119                                                  outlink->w, outlink->h);
00120     outlink->out_buf->pts = picref->pts;
00121 
00122     if (picref->video->sample_aspect_ratio.num == 0) {
00123         outlink->out_buf->video->sample_aspect_ratio = picref->video->sample_aspect_ratio;
00124     } else {
00125         outlink->out_buf->video->sample_aspect_ratio.num = picref->video->sample_aspect_ratio.den;
00126         outlink->out_buf->video->sample_aspect_ratio.den = picref->video->sample_aspect_ratio.num;
00127     }
00128 
00129     avfilter_start_frame(outlink, avfilter_ref_buffer(outlink->out_buf, ~0));
00130 }
00131 
00132 static void end_frame(AVFilterLink *inlink)
00133 {
00134     TransContext *trans = inlink->dst->priv;
00135     AVFilterBufferRef *inpic  = inlink->cur_buf;
00136     AVFilterBufferRef *outpic = inlink->dst->outputs[0]->out_buf;
00137     AVFilterLink *outlink = inlink->dst->outputs[0];
00138     int plane;
00139 
00140     for (plane = 0; outpic->data[plane]; plane++) {
00141         int hsub = plane == 1 || plane == 2 ? trans->hsub : 0;
00142         int vsub = plane == 1 || plane == 2 ? trans->vsub : 0;
00143         int pixstep = trans->pixsteps[plane];
00144         int inh  = inpic->video->h>>vsub;
00145         int outw = outpic->video->w>>hsub;
00146         int outh = outpic->video->h>>vsub;
00147         uint8_t *out, *in;
00148         int outlinesize, inlinesize;
00149         int x, y;
00150 
00151         out = outpic->data[plane]; outlinesize = outpic->linesize[plane];
00152         in  = inpic ->data[plane]; inlinesize  = inpic ->linesize[plane];
00153 
00154         if (trans->dir&1) {
00155             in +=  inpic->linesize[plane] * (inh-1);
00156             inlinesize *= -1;
00157         }
00158 
00159         if (trans->dir&2) {
00160             out += outpic->linesize[plane] * (outh-1);
00161             outlinesize *= -1;
00162         }
00163 
00164         for (y = 0; y < outh; y++) {
00165             switch (pixstep) {
00166             case 1:
00167                 for (x = 0; x < outw; x++)
00168                     out[x] = in[x*inlinesize + y];
00169                 break;
00170             case 2:
00171                 for (x = 0; x < outw; x++)
00172                     *((uint16_t *)(out + 2*x)) = *((uint16_t *)(in + x*inlinesize + y*2));
00173                 break;
00174             case 3:
00175                 for (x = 0; x < outw; x++) {
00176                     int32_t v = AV_RB24(in + x*inlinesize + y*3);
00177                     AV_WB24(out + 3*x, v);
00178                 }
00179                 break;
00180             case 4:
00181                 for (x = 0; x < outw; x++)
00182                     *((uint32_t *)(out + 4*x)) = *((uint32_t *)(in + x*inlinesize + y*4));
00183                 break;
00184             }
00185             out += outlinesize;
00186         }
00187     }
00188 
00189     avfilter_unref_buffer(inpic);
00190     avfilter_draw_slice(outlink, 0, outpic->video->h, 1);
00191     avfilter_end_frame(outlink);
00192     avfilter_unref_buffer(outpic);
00193 }
00194 
00195 static void null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { }
00196 
00197 AVFilter avfilter_vf_transpose = {
00198     .name      = "transpose",
00199     .description = NULL_IF_CONFIG_SMALL("Transpose input video."),
00200 
00201     .init = init,
00202     .priv_size = sizeof(TransContext),
00203 
00204     .query_formats = query_formats,
00205 
00206     .inputs    = (AVFilterPad[]) {{ .name            = "default",
00207                                     .type            = AVMEDIA_TYPE_VIDEO,
00208                                     .start_frame     = start_frame,
00209                                     .draw_slice      = null_draw_slice,
00210                                     .end_frame       = end_frame,
00211                                     .min_perms       = AV_PERM_READ, },
00212                                   { .name = NULL}},
00213     .outputs   = (AVFilterPad[]) {{ .name            = "default",
00214                                     .config_props    = config_props_output,
00215                                     .type            = AVMEDIA_TYPE_VIDEO, },
00216                                   { .name = NULL}},
00217 };

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