tests: add codec helper utils.

Add helper functions to determine the codec type from a specific file
or utility functions to convert from codec type to GstCaps or from
codec name to codec type.

tests/Makefile.am

@@ -67,8 +67,8 @@ test_utils_dec_source_c =	\
 	$(NULL)
 test_utils_dec_source_h	= $(test_utils_dec_source_c:%.c=%.h) test-decode.h
 
-test_utils_source_c	= image.c output.c
-test_utils_source_h	= image.h output.h
+test_utils_source_c	= codec.c image.c output.c
+test_utils_source_h	= codec.h image.h output.h
 
 noinst_LTLIBRARIES	= libutils.la libutils_dec.la
 libutils_la_SOURCES	= $(test_utils_source_c)

tests/codec.c

@@ -0,0 +1,192 @@
+/*
+ *  codec.c - Codec utilities for the tests
+ *
+ *  Copyright (C) 2013 Intel Corporation
+ *
+ *  This library 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.
+ *
+ *  This library 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 this library; if not, write to the Free
+ *  Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ *  Boston, MA 02110-1301 USA
+ */
+
+#include "config.h"
+#include <gst/vaapi/gstvaapidisplay.h>
+#include "codec.h"
+
+typedef struct {
+    const gchar *codec_str;
+    GstVaapiCodec codec;
+    const gchar *caps_str;
+} CodecMap;
+
+static const CodecMap g_codec_map[] = {
+    { "h264",   GST_VAAPI_CODEC_H264,
+      "video/x-h264" },
+    { "jpeg",   GST_VAAPI_CODEC_JPEG,
+      "image/jpeg" },
+    { "mpeg2",  GST_VAAPI_CODEC_MPEG2,
+      "video/mpeg, mpegversion=2" },
+    { "mpeg4",  GST_VAAPI_CODEC_MPEG4,
+      "video/mpeg, mpegversion=4" },
+    { "wmv3",   GST_VAAPI_CODEC_VC1,
+      "video/x-wmv, wmvversion=3" },
+    { "vc1",    GST_VAAPI_CODEC_VC1,
+      "video/x-wmv, wmvversion=3, format=(fourcc)WVC1" },
+    { NULL, }
+};
+
+static const CodecMap *
+get_codec_map(GstVaapiCodec codec)
+{
+    const CodecMap *m;
+
+    if (codec) {
+        for (m = g_codec_map; m->codec_str != NULL; m++) {
+            if (m->codec == codec)
+                return m;
+        }
+    }
+    return NULL;
+}
+
+const gchar *
+string_from_codec(GstVaapiCodec codec)
+{
+    const CodecMap * const m = get_codec_map(codec);
+
+    return m ? m->codec_str : NULL;
+}
+
+GstCaps *
+caps_from_codec(GstVaapiCodec codec)
+{
+    const CodecMap * const m = get_codec_map(codec);
+
+    return m ? gst_caps_from_string(m->caps_str) : NULL;
+}
+
+GstVaapiCodec
+identify_codec_from_string(const gchar *codec_str)
+{
+    const CodecMap *m;
+
+    if (codec_str) {
+        for (m = g_codec_map; m->codec_str != NULL; m++) {
+            if (g_ascii_strcasecmp(m->codec_str, codec_str) == 0)
+                return m->codec;
+        }
+    }
+    return 0;
+}
+
+typedef struct {
+    GMappedFile *file;
+    guint8      *data;
+    guint        size;
+    guint        probability;
+    GstCaps     *caps;
+    GstTypeFind  type_find;
+} CodecIdentifier;
+
+static guint8 *
+codec_identifier_peek(gpointer data, gint64 offset, guint size)
+{
+    CodecIdentifier * const cip = data;
+
+    if (offset >= 0 && offset + size <= cip->size)
+        return cip->data + offset;
+    if (offset < 0 && ((gint)cip->size + offset) >= 0)
+        return &cip->data[cip->size + offset];
+    return NULL;
+}
+
+static void
+codec_identifier_suggest(gpointer data, guint probability, const GstCaps *caps)
+{
+    CodecIdentifier * const cip = data;
+
+    if (cip->probability < probability) {
+        cip->probability = probability;
+        gst_caps_replace(&cip->caps, (GstCaps *)caps);
+    }
+}
+
+static void
+codec_identifier_free(CodecIdentifier *cip)
+{
+    if (!cip)
+        return;
+
+    if (cip->file) {
+        g_mapped_file_unref(cip->file);
+        cip->file = NULL;
+    }
+    gst_caps_replace(&cip->caps, NULL);
+    g_slice_free(CodecIdentifier, cip);
+}
+
+static CodecIdentifier *
+codec_identifier_new(const gchar *filename)
+{
+    CodecIdentifier *cip;
+    GstTypeFind *tfp;
+
+    cip = g_slice_new0(CodecIdentifier);
+    if (!cip)
+        return NULL;
+
+    cip->file = g_mapped_file_new(filename, FALSE, NULL);
+    if (!cip->file)
+        goto error;
+
+    cip->size = g_mapped_file_get_length(cip->file);
+    cip->data = (guint8 *)g_mapped_file_get_contents(cip->file);
+    if (!cip->data)
+        goto error;
+
+    tfp = &cip->type_find;
+    tfp->peek = codec_identifier_peek;
+    tfp->suggest = codec_identifier_suggest;
+    tfp->data = cip;
+    return cip;
+
+error:
+    codec_identifier_free(cip);
+    return NULL;
+}
+
+GstVaapiCodec
+identify_codec(const gchar *filename)
+{
+    CodecIdentifier *cip;
+    GList *type_list, *l;
+    guint32 codec = 0;
+
+    cip = codec_identifier_new(filename);
+    if (!cip)
+        return 0;
+
+    type_list = gst_type_find_factory_get_list();
+    for (l = type_list; l != NULL; l = l->next) {
+        GstTypeFindFactory * const factory = GST_TYPE_FIND_FACTORY(l->data);
+        gst_type_find_factory_call_function(factory, &cip->type_find);
+    }
+    g_list_free(type_list);
+
+    if (cip->probability >= GST_TYPE_FIND_LIKELY)
+        codec = gst_vaapi_profile_get_codec(
+            gst_vaapi_profile_from_caps(cip->caps));
+
+    codec_identifier_free(cip);
+    return codec;
+}

tests/codec.h

@@ -0,0 +1,39 @@
+/*
+ *  codec.h - Codec utilities for the tests
+ *
+ *  Copyright (C) 2013 Intel Corporation
+ *
+ *  This library 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.
+ *
+ *  This library 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 this library; if not, write to the Free
+ *  Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ *  Boston, MA 02110-1301 USA
+ */
+
+#ifndef CODEC_H
+#define CODEC_H
+
+#include <gst/vaapi/gstvaapiprofile.h>
+
+const gchar *
+string_from_codec(GstVaapiCodec codec);
+
+GstCaps *
+caps_from_codec(GstVaapiCodec codec);
+
+GstVaapiCodec
+identify_codec_from_string(const gchar *codec_str);
+
+GstVaapiCodec
+identify_codec(const gchar *filename);
+
+#endif /* CODEC_H */