Add sample_aspect_ratio to AVFilterLink

doc/APIchanges

@@ -13,6 +13,9 @@ libavutil:   2009-03-08
 
 API changes, most recent first:
 
+2011-01-31 - X - lavfi 1.75.0 - AVFilterLink sample_aspect_ratio
+  Add sample_aspect_ratio field to AVFilterLink.
+
 2011-01-15 - r26374 - lavfi 1.74.0 - AVFilterBufferRefAudioProps
   Rename AVFilterBufferRefAudioProps.samples_nb to nb_samples.
 

libavfilter/avfilter.c

@@ -194,6 +194,10 @@ int avfilter_config_links(AVFilterContext *filter)
                 link->time_base = link->src && link->src->input_count ?
                     link->src->inputs[0]->time_base : AV_TIME_BASE_Q;
 
+            if (link->sample_aspect_ratio.num == 0 && link->sample_aspect_ratio.den == 0)
+                link->sample_aspect_ratio = link->src->input_count ?
+                    link->src->inputs[0]->sample_aspect_ratio : (AVRational){1,1};
+
             if ((config_link = link->dstpad->config_props))
                 if ((ret = config_link(link)) < 0)
                     return ret;

libavfilter/avfilter.h

@@ -27,7 +27,7 @@
 #include "libavcore/samplefmt.h"
 
 #define LIBAVFILTER_VERSION_MAJOR  1
-#define LIBAVFILTER_VERSION_MINOR 74
+#define LIBAVFILTER_VERSION_MINOR 75
 #define LIBAVFILTER_VERSION_MICRO  0
 
 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
@@ -580,9 +580,10 @@ struct AVFilterLink {
 
     enum AVMediaType type;      ///< filter media type
 
-    /* These two parameters apply only to video */
+    /* These parameters apply only to video */
     int w;                      ///< agreed upon image width
     int h;                      ///< agreed upon image height
+    AVRational sample_aspect_ratio; ///< agreed upon sample aspect ratio
     /* These two parameters apply only to audio */
     int64_t channel_layout;     ///< channel layout of current buffer (see libavcore/audioconvert.h)
     int64_t sample_rate;        ///< samples per second

libavfilter/vf_aspect.c

@@ -82,6 +82,9 @@ static int setdar_config_props(AVFilterLink *inlink)
 
     av_log(inlink->dst, AV_LOG_INFO, "w:%d h:%d -> dar:%d/%d par:%d/%d\n",
            inlink->w, inlink->h, dar.num, dar.den, aspect->aspect.num, aspect->aspect.den);
+
+    inlink->sample_aspect_ratio = aspect->aspect;
+
     return 0;
 }
 
@@ -108,6 +111,16 @@ AVFilter avfilter_vf_setdar = {
 #endif /* CONFIG_SETDAR_FILTER */
 
 #if CONFIG_SETSAR_FILTER
+/* for setdar filter, convert from frame aspect ratio to pixel aspect ratio */
+static int setsar_config_props(AVFilterLink *inlink)
+{
+    AspectContext *aspect = inlink->dst->priv;
+
+    inlink->sample_aspect_ratio = aspect->aspect;
+
+    return 0;
+}
+
 AVFilter avfilter_vf_setsar = {
     .name      = "setsar",
     .description = NULL_IF_CONFIG_SMALL("Set the pixel sample aspect ratio."),
@@ -118,6 +131,7 @@ AVFilter avfilter_vf_setsar = {
 
     .inputs    = (AVFilterPad[]) {{ .name             = "default",
                                     .type             = AVMEDIA_TYPE_VIDEO,
+                                    .config_props     = setsar_config_props,
                                     .get_video_buffer = avfilter_null_get_video_buffer,
                                     .start_frame      = start_frame,
                                     .end_frame        = avfilter_null_end_frame },

libavfilter/vf_transpose.c

@@ -102,6 +102,11 @@ static int config_props_output(AVFilterLink *outlink)
     outlink->w = inlink->h;
     outlink->h = inlink->w;
 
+    if (inlink->sample_aspect_ratio.num){
+        outlink->sample_aspect_ratio = av_div_q((AVRational){1,1}, inlink->sample_aspect_ratio);
+    } else
+        outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;
+
     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",