lavfi: add libavfilter/avcodec.h and avfilter_copy_frame_props()

avfilter_copy_frame_props() avoids code duplication and increases
robustness.

The added files libavfilter/avcodec.[ch] are used for containing
utilities useful for gluing togheter libavfilter and libavcodec.

doc/APIchanges

@@ -13,6 +13,10 @@ libavutil:   2011-04-18
 
 API changes, most recent first:
 
+2011-05-07 - xxxxxxx - lavfi 2.5.0 - avcodec.h
+  Add libavfilter/avcodec.h header and avfilter_copy_frame_props()
+  function.
+
 2011-05-07 - xxxxxxx - lavc 53.5.0 - AVFrame
   Add format field to AVFrame.
 

ffmpeg.c

@@ -50,6 +50,7 @@
 #include "libavformat/ffm.h" // not public API
 
 #if CONFIG_AVFILTER
+# include "libavfilter/avcodec.h"
 # include "libavfilter/avfilter.h"
 # include "libavfilter/avfiltergraph.h"
 # include "libavfilter/vsrc_buffer.h"

ffplay.c

@@ -40,6 +40,7 @@
 #include "libavcodec/avfft.h"
 
 #if CONFIG_AVFILTER
+# include "libavfilter/avcodec.h"
 # include "libavfilter/avfilter.h"
 # include "libavfilter/avfiltergraph.h"
 #endif
@@ -1686,9 +1687,9 @@ static int input_request_frame(AVFilterLink *link)
     }
     av_free_packet(&pkt);
 
+    avfilter_copy_frame_props(picref, priv->frame);
     picref->pts = pts;
-    picref->pos = priv->frame->pkt_pos;
+
-    picref->video->sample_aspect_ratio = priv->frame->sample_aspect_ratio;
     avfilter_start_frame(link, picref);
     avfilter_draw_slice(link, 0, link->h, 1);
     avfilter_end_frame(link);

libavfilter/Makefile

@@ -6,7 +6,7 @@ FFLIBS-$(CONFIG_MOVIE_FILTER) += avformat avcodec
 FFLIBS-$(CONFIG_SCALE_FILTER) += swscale
 FFLIBS-$(CONFIG_MP_FILTER) += avcodec
 
-HEADERS = avfilter.h avfiltergraph.h
+HEADERS = avcodec.h avfilter.h avfiltergraph.h
 
 OBJS = allfilters.o                                                     \
        avfilter.o                                                       \
@@ -16,6 +16,8 @@ OBJS = allfilters.o                                                     \
        formats.o                                                        \
        graphparser.o                                                    \
 
+OBJS-$(CONFIG_AVCODEC)                       += avcodec.o
+
 OBJS-$(CONFIG_ANULL_FILTER)                  += af_anull.o
 
 OBJS-$(CONFIG_ANULLSRC_FILTER)               += asrc_anullsrc.o

libavfilter/avcodec.c

@@ -0,0 +1,42 @@
+/*
+ * 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
+ * libavcodec/libavfilter gluing utilities
+ */
+
+#include "avcodec.h"
+
+void avfilter_copy_frame_props(AVFilterBufferRef *dst, const AVFrame *src)
+{
+    dst->pts    = src->pts;
+    dst->pos    = src->pkt_pos;
+    dst->format = src->format;
+
+    switch (dst->type) {
+    case AVMEDIA_TYPE_VIDEO:
+        dst->video->w                   = src->width;
+        dst->video->h                   = src->height;
+        dst->video->sample_aspect_ratio = src->sample_aspect_ratio;
+        dst->video->interlaced          = src->interlaced_frame;
+        dst->video->top_field_first     = src->top_field_first;
+        dst->video->key_frame           = src->key_frame;
+        dst->video->pict_type           = src->pict_type;
+    }
+}

libavfilter/avcodec.h

@@ -0,0 +1,40 @@
+/*
+ * 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
+ */
+
+#ifndef AVFILTER_AVCODEC_H
+#define AVFILTER_AVCODEC_H
+
+/**
+ * @file
+ * libavcodec/libavfilter gluing utilities
+ *
+ * This should be included in an application ONLY if the installed
+ * libavfilter has been compiled with libavcodec support, otherwise
+ * symbols defined below will not be available.
+ */
+
+#include "libavcodec/avcodec.h" // AVFrame
+#include "avfilter.h"
+
+/**
+ * Copy the frame properties of src to dst, without copying the actual
+ * image data.
+ */
+void avfilter_copy_frame_props(AVFilterBufferRef *dst, const AVFrame *src);
+
+#endif /* AVFILTER_AVCODEC_H */

libavfilter/avfilter.h

@@ -26,7 +26,7 @@
 #include "libavutil/samplefmt.h"
 
 #define LIBAVFILTER_VERSION_MAJOR  2
-#define LIBAVFILTER_VERSION_MINOR  4
+#define LIBAVFILTER_VERSION_MINOR  5
 #define LIBAVFILTER_VERSION_MICRO  0
 
 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \

libavfilter/vsrc_buffer.c

@@ -24,6 +24,7 @@
  */
 
 #include "avfilter.h"
+#include "avcodec.h"
 #include "vsrc_buffer.h"
 #include "libavutil/imgutils.h"
 
@@ -193,13 +194,9 @@ static int request_frame(AVFilterLink *link)
     av_image_copy(picref->data, picref->linesize,
                   c->frame.data, c->frame.linesize,
                   picref->format, link->w, link->h);
+    avfilter_copy_frame_props(picref, &c->frame);
+    picref->pts = c->pts;
 
-    picref->pts                    = c->pts;
-    picref->video->sample_aspect_ratio = c->frame.sample_aspect_ratio;
-    picref->video->interlaced      = c->frame.interlaced_frame;
-    picref->video->top_field_first = c->frame.top_field_first;
-    picref->video->key_frame       = c->frame.key_frame;
-    picref->video->pict_type       = c->frame.pict_type;
     avfilter_start_frame(link, avfilter_ref_buffer(picref, ~0));
     avfilter_draw_slice(link, 0, link->h, 1);
     avfilter_end_frame(link);

libavfilter/vsrc_movie.c

@@ -35,6 +35,7 @@
 #include "libavutil/opt.h"
 #include "libavutil/imgutils.h"
 #include "libavformat/avformat.h"
+#include "avcodec.h"
 #include "avfilter.h"
 
 typedef struct {
@@ -239,20 +240,15 @@ static int movie_get_frame(AVFilterLink *outlink)
                 av_image_copy(movie->picref->data, movie->picref->linesize,
                               movie->frame->data,  movie->frame->linesize,
                               movie->picref->format, outlink->w, outlink->h);
+                avfilter_copy_frame_props(movie->picref, movie->frame);
 
                 /* FIXME: use a PTS correction mechanism as that in
                  * ffplay.c when some API will be available for that */
                 /* use pkt_dts if pkt_pts is not available */
                 movie->picref->pts = movie->frame->pkt_pts == AV_NOPTS_VALUE ?
                     movie->frame->pkt_dts : movie->frame->pkt_pts;
-
-                movie->picref->pos                    = movie->frame->pkt_pos;
                 if (!movie->frame->sample_aspect_ratio.num)
                     movie->picref->video->sample_aspect_ratio = st->sample_aspect_ratio;
-                movie->picref->video->interlaced      = movie->frame->interlaced_frame;
-                movie->picref->video->top_field_first = movie->frame->top_field_first;
-                movie->picref->video->key_frame       = movie->frame->key_frame;
-                movie->picref->video->pict_type       = movie->frame->pict_type;
                 av_dlog(outlink->src,
                         "movie_get_frame(): file:'%s' pts:%"PRId64" time:%lf pos:%"PRId64" aspect:%d/%d\n",
                         movie->file_name, movie->picref->pts,