[SCM] libav/experimental: Move default entry point implementations to their own file. Make them externally visible because they may be useful for filters to use.

[siretart at users.alioth.debian.org]

The following commit has been merged in the experimental branch:
commit bf4ce7a364fc53b71db367e3b64c8202acf1e584
Author: Vitor Sessak <vitor1001 at gmail.com>
Date:   Fri Feb 15 21:58:25 2008 +0000

    Move default entry point implementations to their own file.
    Make them externally visible because they may be useful for filters to use.
    
    Commited in SoC by Bobby Bingham on 2007-08-02 15:14:05
    
    Originally committed as revision 12063 to svn://svn.ffmpeg.org/ffmpeg/trunk

diff --git a/libavfilter/defaults.c b/libavfilter/defaults.c
new file mode 100644
index 0000000..570d21d
--- /dev/null
+++ b/libavfilter/defaults.c
@@ -0,0 +1,118 @@
+/*
+ * Filter layer - default implementations
+ * copyright (c) 2007 Bobby Bingham
+ *
+ * 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
+ */
+
+#include "avfilter.h"
+
+/* TODO: buffer pool.  see comment for avfilter_default_get_video_buffer() */
+void avfilter_default_free_video_buffer(AVFilterPic *pic)
+{
+    avpicture_free((AVPicture *) pic);
+    av_free(pic);
+}
+
+/* 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)
+{
+    AVFilterPic *pic = av_mallocz(sizeof(AVFilterPic));
+    AVFilterPicRef *ref = av_mallocz(sizeof(AVFilterPicRef));
+
+    ref->pic   = pic;
+    ref->w     = link->w;
+    ref->h     = link->h;
+    ref->perms = perms;
+
+    pic->refcount = 1;
+    pic->format   = link->format;
+    pic->free     = avfilter_default_free_video_buffer;
+    avpicture_alloc((AVPicture *)pic, pic->format, ref->w, ref->h);
+
+    memcpy(ref->data,     pic->data,     sizeof(pic->data));
+    memcpy(ref->linesize, pic->linesize, sizeof(pic->linesize));
+
+    return ref;
+}
+
+void avfilter_default_start_frame(AVFilterLink *link, AVFilterPicRef *picref)
+{
+    AVFilterLink *out = NULL;
+
+    if(link->dst->output_count)
+        out = link->dst->outputs[0];
+
+    link->cur_pic = picref;
+
+    if(out) {
+        out->outpic      = avfilter_get_video_buffer(out, AV_PERM_WRITE);
+        out->outpic->pts = picref->pts;
+        avfilter_start_frame(out, avfilter_ref_pic(out->outpic, ~0));
+    }
+}
+
+void avfilter_default_end_frame(AVFilterLink *link)
+{
+    AVFilterLink *out = NULL;
+
+    if(link->dst->output_count)
+        out = link->dst->outputs[0];
+
+    avfilter_unref_pic(link->cur_pic);
+    link->cur_pic = NULL;
+
+    if(out) {
+        avfilter_unref_pic(out->outpic);
+        out->outpic = NULL;
+        avfilter_end_frame(out);
+    }
+}
+
+/**
+ * default config_link() implementation for output video links to simplify
+ * the implementation of one input one output video filters */
+int avfilter_default_config_output_link(AVFilterLink *link)
+{
+    if(link->src->input_count && link->src->inputs[0]) {
+        link->w = link->src->inputs[0]->w;
+        link->h = link->src->inputs[0]->h;
+    } 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 0;
+}
+
+/**
+ * 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)
+{
+    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);
+}
+

-- 
Libav/FFmpeg packaging