First libavfilter commit.

Original log message:
Forgot to add in the big colorspace commit

Commited in SoC by Bobby Bingham

Originally committed as revision 11891 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavfilter/formats.c

+/*
+ * Filter layer - format negotiation
+ * 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"
+
+AVFilterFormats *avfilter_merge_formats(AVFilterFormats *a, AVFilterFormats *b)
+{
+    AVFilterFormats *ret;
+    unsigned i, j, k = 0;
+
+    ret = av_mallocz(sizeof(AVFilterFormats));
+
+    /* merge list of formats */
+    ret->formats = av_malloc(sizeof(int) * FFMIN(a->format_count,
+                                                 b->format_count));
+    for(i = 0; i < a->format_count; i ++)
+        for(j = 0; j < b->format_count; j ++)
+            if(a->formats[i] == b->formats[j])
+                ret->formats[k++] = a->formats[i];
+
+    /* check that there was at least one common format */
+    if(!(ret->format_count = k)) {
+        av_free(ret->formats);
+        av_free(ret);
+        return NULL;
+    }
+
+    /* merge and update all the references */
+    ret->refs = av_malloc(sizeof(AVFilterFormats**)*(a->refcount+b->refcount));
+    for(i = 0; i < a->refcount; i ++) {
+        ret->refs[ret->refcount] = a->refs[i];
+        *ret->refs[ret->refcount++] = ret;
+    }
+    for(i = 0; i < b->refcount; i ++) {
+        ret->refs[ret->refcount] = b->refs[i];
+        *ret->refs[ret->refcount++] = ret;
+    }
+
+    av_free(a->refs);
+    av_free(a->formats);
+    av_free(a);
+
+    av_free(b->refs);
+    av_free(b->formats);
+    av_free(b);
+
+    return ret;
+}
+
+AVFilterFormats *avfilter_make_format_list(int len, ...)
+{
+    AVFilterFormats *ret;
+    int i;
+    va_list vl;
+
+    ret = av_mallocz(sizeof(AVFilterFormats));
+    ret->formats = av_malloc(sizeof(int) * len);
+    ret->format_count = len;
+
+    va_start(vl, len);
+    for(i = 0; i < len; i ++)
+        ret->formats[i] = va_arg(vl, int);
+    va_end(vl);
+
+    return ret;
+}
+
+AVFilterFormats *avfilter_all_colorspaces(void)
+{
+    return avfilter_make_format_list(31,
+                PIX_FMT_YUV444P,  PIX_FMT_YUV422P,  PIX_FMT_YUV420P,
+                PIX_FMT_YUV411P,  PIX_FMT_YUV410P,
+                PIX_FMT_YUYV422,  PIX_FMT_UYVY422,  PIX_FMT_UYYVYY411,
+                PIX_FMT_YUVJ444P, PIX_FMT_YUVJ422P, PIX_FMT_YUVJ420P,
+                PIX_FMT_YUV440P,  PIX_FMT_YUVJ440P,
+                PIX_FMT_RGB32,    PIX_FMT_BGR32,
+                PIX_FMT_RGB32_1,  PIX_FMT_BGR32_1,
+                PIX_FMT_RGB24,    PIX_FMT_BGR24,
+                PIX_FMT_RGB565,   PIX_FMT_BGR565,
+                PIX_FMT_RGB555,   PIX_FMT_BGR555,
+                PIX_FMT_RGB8,     PIX_FMT_BGR8,
+                PIX_FMT_RGB4_BYTE,PIX_FMT_BGR4_BYTE,
+                PIX_FMT_GRAY16BE, PIX_FMT_GRAY16LE,
+                PIX_FMT_GRAY8,    PIX_FMT_PAL8);
+}
+
+void avfilter_formats_ref(AVFilterFormats *f, AVFilterFormats **ref)
+{
+    *ref = f;
+    f->refs = av_realloc(f->refs, sizeof(AVFilterFormats**) * ++f->refcount);
+    f->refs[f->refcount-1] = ref;
+}
+
+void avfilter_formats_unref(AVFilterFormats **ref)
+{
+    if(!--(*ref)->refcount) {
+        av_free((*ref)->formats);
+        av_free((*ref)->refs);
+        av_free(*ref);
+    }
+    *ref = NULL;
+}
+