lavfi: add showinfo filter

Signed-off-by: Anton Khirnov <anton@khirnov.net>

1 files changed, 98 insertions, 0 deletions

diff --git a/libavfilter/vf_showinfo.c b/libavfilter/vf_showinfo.c
new file mode 100644
index 0000000000..aa2a7f16f9
--- /dev/null
+++ b/libavfilter/vf_showinfo.c
@@ -0,0 +1,98 @@
+/*
+ * Copyright (c) 2011 Stefano Sabatini
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * filter for showing textual video frame information
+ */
+
+#include "libavutil/adler32.h"
+#include "libavutil/imgutils.h"
+#include "libavutil/pixdesc.h"
+#include "avfilter.h"
+
+typedef struct {
+    unsigned int frame;
+} ShowInfoContext;
+
+static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
+{
+    ShowInfoContext *showinfo = ctx->priv;
+    showinfo->frame = 0;
+    return 0;
+}
+
+static void end_frame(AVFilterLink *inlink)
+{
+    AVFilterContext *ctx = inlink->dst;
+    ShowInfoContext *showinfo = ctx->priv;
+    AVFilterBufferRef *picref = inlink->cur_buf;
+    uint32_t plane_checksum[4] = {0}, checksum = 0;
+    int i, plane, vsub = av_pix_fmt_descriptors[inlink->format].log2_chroma_h;
+
+    for (plane = 0; picref->data[plane] && plane < 4; plane++) {
+        size_t linesize = av_image_get_linesize(picref->format, picref->video->w, plane);
+        uint8_t *data = picref->data[plane];
+        int h = plane == 1 || plane == 2 ? inlink->h >> vsub : inlink->h;
+
+        for (i = 0; i < h; i++) {
+            plane_checksum[plane] = av_adler32_update(plane_checksum[plane], data, linesize);
+            checksum = av_adler32_update(checksum, data, linesize);
+            data += picref->linesize[plane];
+        }
+    }
+
+    av_log(ctx, AV_LOG_INFO,
+           "n:%d pts:%"PRId64" pts_time:%f pos:%"PRId64" "
+           "fmt:%s sar:%d/%d s:%dx%d i:%c iskey:%d type:%c "
+           "checksum:%u plane_checksum:[%u %u %u %u]\n",
+           showinfo->frame,
+           picref->pts, picref->pts * av_q2d(inlink->time_base), picref->pos,
+           av_pix_fmt_descriptors[picref->format].name,
+           picref->video->pixel_aspect.num, picref->video->pixel_aspect.den,
+           picref->video->w, picref->video->h,
+           !picref->video->interlaced     ? 'P' :         /* Progressive  */
+           picref->video->top_field_first ? 'T' : 'B',    /* Top / Bottom */
+           picref->video->key_frame,
+           av_get_picture_type_char(picref->video->pict_type),
+           checksum, plane_checksum[0], plane_checksum[1], plane_checksum[2], plane_checksum[3]);
+
+    showinfo->frame++;
+    avfilter_end_frame(inlink->dst->outputs[0]);
+}
+
+AVFilter avfilter_vf_showinfo = {
+    .name        = "showinfo",
+    .description = NULL_IF_CONFIG_SMALL("Show textual information for each video frame."),
+
+    .priv_size = sizeof(ShowInfoContext),
+    .init      = init,
+
+    .inputs    = (AVFilterPad[]) {{ .name = "default",
+                                    .type             = AVMEDIA_TYPE_VIDEO,
+                                    .get_video_buffer = avfilter_null_get_video_buffer,
+                                    .start_frame      = avfilter_null_start_frame,
+                                    .end_frame        = end_frame,
+                                    .min_perms        = AV_PERM_READ, },
+                                  { .name = NULL}},
+
+    .outputs   = (AVFilterPad[]) {{ .name             = "default",
+                                    .type             = AVMEDIA_TYPE_VIDEO },
+                                  { .name = NULL}},
+};