Document create_filter().

[ffmpeg] / libavfilter / defaults.c

diff --git a/libavfilter/defaults.c b/libavfilter/defaults.c
index da739d9d972a8b2ccb505f03f86d33e8312c0d3f..ed1db94b69dc54e3b0615f6ec104c933dea80d09 100644 (file)
--- a/libavfilter/defaults.c
+++ b/libavfilter/defaults.c
@@ -19,32 +19,45 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+#include "libavcodec/imgconvert.h"
 #include "avfilter.h"
 
 /* TODO: buffer pool.  see comment for avfilter_default_get_video_buffer() */
-void avfilter_default_free_video_buffer(AVFilterPic *pic)
+static void avfilter_default_free_buffer(AVFilterBuffer *ptr)
 {
-    avpicture_free((AVPicture *) pic);
-    av_free(pic);
+    av_free(ptr->data[0]);
+    av_free(ptr);
 }
 
 /* TODO: set the buffer's priv member to a context structure for the whole
  * filter chain.  This will allow for a buffer pool instead of the constant
  * alloc & free cycle currently implemented. */
-AVFilterPicRef *avfilter_default_get_video_buffer(AVFilterLink *link, int perms)
+AVFilterPicRef *avfilter_default_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
 {
-    AVFilterPic *pic = av_mallocz(sizeof(AVFilterPic));
+    AVFilterBuffer *pic = av_mallocz(sizeof(AVFilterBuffer));
     AVFilterPicRef *ref = av_mallocz(sizeof(AVFilterPicRef));
+    int i, tempsize;
+    char *buf;
 
     ref->pic   = pic;
-    ref->w     = link->w;
-    ref->h     = link->h;
-    ref->perms = perms;
+    ref->w     = w;
+    ref->h     = h;
+
+    /* make sure the buffer gets read permission or it's useless for output */
+    ref->perms = perms | AV_PERM_READ;
 
     pic->refcount = 1;
     pic->format   = link->format;
-    pic->free     = avfilter_default_free_video_buffer;
-    avpicture_alloc((AVPicture *)pic, pic->format, ref->w, ref->h);
+    pic->free     = avfilter_default_free_buffer;
+    ff_fill_linesize((AVPicture *)pic, pic->format, ref->w);
+
+    for (i=0; i<4;i++)
+        pic->linesize[i] = FFALIGN(pic->linesize[i], 16);
+
+    tempsize = ff_fill_pointer((AVPicture *)pic, NULL, pic->format, ref->h);
+    buf = av_malloc(tempsize + 16); // +2 is needed for swscaler, +16 to be
+                                    // SIMD-friendly
+    ff_fill_pointer((AVPicture *)pic, buf, pic->format, ref->h);
 
     memcpy(ref->data,     pic->data,     sizeof(pic->data));
     memcpy(ref->linesize, pic->linesize, sizeof(pic->linesize));
@@ -60,12 +73,23 @@ void avfilter_default_start_frame(AVFilterLink *link, AVFilterPicRef *picref)
         out = link->dst->outputs[0];
 
     if(out) {
-        out->outpic      = avfilter_get_video_buffer(out, AV_PERM_WRITE);
-        out->outpic->pts = picref->pts;
+        out->outpic      = avfilter_get_video_buffer(out, AV_PERM_WRITE, out->w, out->h);
+        avfilter_copy_picref_props(out->outpic, picref);
         avfilter_start_frame(out, avfilter_ref_pic(out->outpic, ~0));
     }
 }
 
+void avfilter_default_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
+{
+    AVFilterLink *out = NULL;
+
+    if(link->dst->output_count)
+        out = link->dst->outputs[0];
+
+    if(out)
+        avfilter_draw_slice(out, y, h, slice_dir);
+}
+
 void avfilter_default_end_frame(AVFilterLink *link)
 {
     AVFilterLink *out = NULL;
@@ -96,33 +120,67 @@ int avfilter_default_config_output_link(AVFilterLink *link)
     } else {
         /* XXX: any non-simple filter which would cause this branch to be taken
          * really should implement its own config_props() for this link. */
-        link->w =
-        link->h = 0;
+        return -1;
     }
 
     return 0;
 }
 
 /**
- * default config_link() implementation for input video links to simplify
- * the implementation of one input one output video filters */
-int avfilter_default_config_input_link(AVFilterLink *link)
+ * A helper for query_formats() which sets all links to the same list of
+ * formats. If there are no links hooked to this filter, the list of formats is
+ * freed.
+ *
+ * FIXME: this will need changed for filters with a mix of pad types
+ * (video + audio, etc)
+ */
+void avfilter_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats)
 {
-    if(!link->dst->output_count)
-        return 0;
-    return avfilter_config_link(link->dst->outputs[0]);
+    int count = 0, i;
+
+    for(i = 0; i < ctx->input_count; i ++) {
+        if(ctx->inputs[i]) {
+            avfilter_formats_ref(formats, &ctx->inputs[i]->out_formats);
+            count ++;
+        }
+    }
+    for(i = 0; i < ctx->output_count; i ++) {
+        if(ctx->outputs[i]) {
+            avfilter_formats_ref(formats, &ctx->outputs[i]->in_formats);
+            count ++;
+        }
+    }
+
+    if(!count) {
+        av_free(formats->formats);
+        av_free(formats->refs);
+        av_free(formats);
+    }
 }
 
-/**
- * default query_formats() implementation for output video links to simplify
- * the implementation of one input one output video filters */
-int *avfilter_default_query_output_formats(AVFilterLink *link)
+int avfilter_default_query_formats(AVFilterContext *ctx)
 {
-    if(link->src->input_count && link->src->inputs[0])
-        return avfilter_make_format_list(1, link->src->inputs[0]->format);
-    else
-        /* XXX: any non-simple filter which would cause this branch to be taken
-         * really should implement its own query_formats() for this link */
-        return avfilter_make_format_list(0);
+    avfilter_set_common_formats(ctx, avfilter_all_colorspaces());
+    return 0;
+}
+
+void avfilter_null_start_frame(AVFilterLink *link, AVFilterPicRef *picref)
+{
+    avfilter_start_frame(link->dst->outputs[0], picref);
+}
+
+void avfilter_null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
+{
+    avfilter_draw_slice(link->dst->outputs[0], y, h, slice_dir);
+}
+
+void avfilter_null_end_frame(AVFilterLink *link)
+{
+    avfilter_end_frame(link->dst->outputs[0]);
+}
+
+AVFilterPicRef *avfilter_null_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
+{
+    return avfilter_get_video_buffer(link->dst->outputs[0], perms, w, h);
 }