Add transpose filter.

Originally committed as revision 25525 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 212 insertions, 0 deletions

diff --git a/libavfilter/vf_transpose.c b/libavfilter/vf_transpose.c
new file mode 100644
index 0000000000..8d44e56ea3
--- /dev/null
+++ b/libavfilter/vf_transpose.c
@@ -0,0 +1,212 @@
+/*
+ * Copyright (C) 2010 Stefano Sabatini
+ * Copyright (C) 2008 Vitor Sessak
+ *
+ * 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
+ */
+
+/**
+ * @file
+ * transposition filter
+ * Based on MPlayer libmpcodecs/vf_rotate.c.
+ */
+
+#include "libavutil/intreadwrite.h"
+#include "libavutil/pixdesc.h"
+#include "libavcore/imgutils.h"
+#include "avfilter.h"
+
+typedef struct {
+    int hsub, vsub;
+    int pixsteps[4];
+
+    /* 0    Rotate by 90 degrees counterclockwise and vflip. */
+    /* 1    Rotate by 90 degrees clockwise.                  */
+    /* 2    Rotate by 90 degrees counterclockwise.           */
+    /* 3    Rotate by 90 degrees clockwise and vflip.        */
+    int dir;
+} TransContext;
+
+static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
+{
+    TransContext *trans = ctx->priv;
+    trans->dir = 0;
+
+    if (args)
+        sscanf(args, "%d", &trans->dir);
+
+    if (trans->dir < 0 || trans->dir > 3) {
+        av_log(ctx, AV_LOG_ERROR, "Invalid value %d not between 0 and 3.\n",
+               trans->dir);
+        return AVERROR(EINVAL);
+    }
+    return 0;
+}
+
+static int query_formats(AVFilterContext *ctx)
+{
+    enum PixelFormat pix_fmts[] = {
+        PIX_FMT_ARGB,         PIX_FMT_RGBA,
+        PIX_FMT_ABGR,         PIX_FMT_BGRA,
+        PIX_FMT_RGB24,        PIX_FMT_BGR24,
+        PIX_FMT_RGB565BE,     PIX_FMT_RGB565LE,
+        PIX_FMT_RGB555BE,     PIX_FMT_RGB555LE,
+        PIX_FMT_BGR565BE,     PIX_FMT_BGR565LE,
+        PIX_FMT_BGR555BE,     PIX_FMT_BGR555LE,
+        PIX_FMT_GRAY16BE,     PIX_FMT_GRAY16LE,
+        PIX_FMT_YUV420P16LE,  PIX_FMT_YUV420P16BE,
+        PIX_FMT_YUV422P16LE,  PIX_FMT_YUV422P16BE,
+        PIX_FMT_YUV444P16LE,  PIX_FMT_YUV444P16BE,
+        PIX_FMT_NV12,         PIX_FMT_NV21,
+        PIX_FMT_RGB8,         PIX_FMT_BGR8,
+        PIX_FMT_RGB4_BYTE,    PIX_FMT_BGR4_BYTE,
+        PIX_FMT_YUV444P,      PIX_FMT_YUV422P,
+        PIX_FMT_YUV420P,      PIX_FMT_YUVJ420P,
+        PIX_FMT_YUV411P,      PIX_FMT_YUV410P,
+        PIX_FMT_YUVJ444P,     PIX_FMT_YUVJ422P,
+        PIX_FMT_YUV440P,      PIX_FMT_YUVJ440P,
+        PIX_FMT_YUVA420P,     PIX_FMT_GRAY8,
+        PIX_FMT_NONE
+    };
+
+    avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts));
+    return 0;
+}
+
+static int config_props_output(AVFilterLink *outlink)
+{
+    AVFilterContext *ctx = outlink->src;
+    TransContext *trans = ctx->priv;
+    AVFilterLink *inlink = ctx->inputs[0];
+    const AVPixFmtDescriptor *pixdesc = &av_pix_fmt_descriptors[outlink->format];
+
+    trans->hsub = av_pix_fmt_descriptors[inlink->format].log2_chroma_w;
+    trans->vsub = av_pix_fmt_descriptors[inlink->format].log2_chroma_h;
+
+    av_image_fill_max_pixsteps(trans->pixsteps, NULL, pixdesc);
+
+    outlink->w = inlink->h;
+    outlink->h = inlink->w;
+
+    av_log(ctx, AV_LOG_INFO, "w:%d h:%d dir:%d -> w:%d h:%d rotation:%s vflip:%d\n",
+           inlink->w, inlink->h, trans->dir, outlink->w, outlink->h,
+           trans->dir == 1 || trans->dir == 3 ? "clockwise" : "counterclockwise",
+           trans->dir == 0 || trans->dir == 3);
+    return 0;
+}
+
+static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
+{
+    AVFilterLink *outlink = inlink->dst->outputs[0];
+
+    outlink->out_buf = avfilter_get_video_buffer(outlink, AV_PERM_WRITE,
+                                                 outlink->w, outlink->h);
+    outlink->out_buf->pts = picref->pts;
+
+    if (picref->video->pixel_aspect.num == 0) {
+        outlink->out_buf->video->pixel_aspect = picref->video->pixel_aspect;
+    } else {
+        outlink->out_buf->video->pixel_aspect.num = picref->video->pixel_aspect.den;
+        outlink->out_buf->video->pixel_aspect.den = picref->video->pixel_aspect.num;
+    }
+
+    avfilter_start_frame(outlink, avfilter_ref_buffer(outlink->out_buf, ~0));
+}
+
+static void end_frame(AVFilterLink *inlink)
+{
+    TransContext *trans = inlink->dst->priv;
+    AVFilterBufferRef *inpic  = inlink->cur_buf;
+    AVFilterBufferRef *outpic = inlink->dst->outputs[0]->out_buf;
+    AVFilterLink *outlink = inlink->dst->outputs[0];
+    int plane;
+
+    for (plane = 0; outpic->data[plane]; plane++) {
+        int hsub = plane == 1 || plane == 2 ? trans->hsub : 0;
+        int vsub = plane == 1 || plane == 2 ? trans->vsub : 0;
+        int pixstep = trans->pixsteps[plane];
+        int inh  = inpic->video->h>>vsub;
+        int outw = outpic->video->w>>hsub;
+        int outh = outpic->video->h>>vsub;
+        uint8_t *out, *in;
+        int outlinesize, inlinesize;
+        int x, y;
+
+        out = outpic->data[plane]; outlinesize = outpic->linesize[plane];
+        in  = inpic ->data[plane]; inlinesize  = inpic ->linesize[plane];
+
+        if (trans->dir&1) {
+            in +=  inpic->linesize[plane] * (inh-1);
+            inlinesize *= -1;
+        }
+
+        if (trans->dir&2) {
+            out += outpic->linesize[plane] * (outh-1);
+            outlinesize *= -1;
+        }
+
+        for (y = 0; y < outh; y++) {
+            switch (pixstep) {
+            case 1:
+                for (x = 0; x < outw; x++)
+                    out[x] = in[x*inlinesize + y];
+                break;
+            case 2:
+                for (x = 0; x < outw; x++)
+                    *((uint16_t *)(out + 2*x)) = *((uint16_t *)(in + x*inlinesize + y*2));
+                break;
+            case 3:
+                for (x = 0; x < outw; x++) {
+                    int32_t v = AV_RB24(in + x*inlinesize + y*3);
+                    AV_WB24(out + 3*x, v);
+                }
+                break;
+            case 4:
+                for (x = 0; x < outw; x++)
+                    *((uint32_t *)(out + 4*x)) = *((uint32_t *)(in + x*inlinesize + y*4));
+                break;
+            }
+            out += outlinesize;
+        }
+    }
+
+    avfilter_unref_buffer(inpic);
+    avfilter_draw_slice(outlink, 0, outpic->video->h, 1);
+    avfilter_end_frame(outlink);
+    avfilter_unref_buffer(outpic);
+}
+
+AVFilter avfilter_vf_transpose = {
+    .name      = "transpose",
+    .description = NULL_IF_CONFIG_SMALL("Transpose input video."),
+
+    .init = init,
+    .priv_size = sizeof(TransContext),
+
+    .query_formats = query_formats,
+
+    .inputs    = (AVFilterPad[]) {{ .name            = "default",
+                                    .type            = AVMEDIA_TYPE_VIDEO,
+                                    .start_frame     = start_frame,
+                                    .end_frame       = end_frame,
+                                    .min_perms       = AV_PERM_READ, },
+                                  { .name = NULL}},
+    .outputs   = (AVFilterPad[]) {{ .name            = "default",
+                                    .config_props    = config_props_output,
+                                    .type            = AVMEDIA_TYPE_VIDEO, },
+                                  { .name = NULL}},
+};