gstreamer/tests/codec.c

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/*
* codec.c - Codec utilities for the tests
*
* Copyright (C) 2013 Intel Corporation
* Author: Gwenole Beauchesne <gwenole.beauchesne@intel.com>
*
* 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 "gst/vaapi/sysdeps.h"
#include <gst/vaapi/gstvaapidisplay.h>
#include "codec.h"
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typedef struct
{
const gchar *codec_str;
GstVaapiCodec codec;
const gchar *caps_str;
} CodecMap;
static const CodecMap g_codec_map[] = {
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{"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=(string)WVC1"},
{NULL,}
};
static const CodecMap *
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get_codec_map (GstVaapiCodec codec)
{
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const CodecMap *m;
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if (codec) {
for (m = g_codec_map; m->codec_str != NULL; m++) {
if (m->codec == codec)
return m;
}
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}
return NULL;
}
const gchar *
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string_from_codec (GstVaapiCodec codec)
{
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const CodecMap *const m = get_codec_map (codec);
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return m ? m->codec_str : NULL;
}
GstCaps *
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caps_from_codec (GstVaapiCodec codec)
{
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const CodecMap *const m = get_codec_map (codec);
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return m ? gst_caps_from_string (m->caps_str) : NULL;
}
GstVaapiCodec
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identify_codec_from_string (const gchar * codec_str)
{
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const CodecMap *m;
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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;
}
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}
return 0;
}
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typedef struct
{
GMappedFile *file;
guint8 *data;
guint size;
guint probability;
GstCaps *caps;
GstTypeFind type_find;
} CodecIdentifier;
static const guint8 *
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codec_identifier_peek (gpointer data, gint64 offset, guint size)
{
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CodecIdentifier *const cip = data;
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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
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codec_identifier_suggest (gpointer data, guint probability, GstCaps * caps)
{
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CodecIdentifier *const cip = data;
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if (cip->probability < probability) {
cip->probability = probability;
gst_caps_replace (&cip->caps, caps);
}
}
static void
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codec_identifier_free (CodecIdentifier * cip)
{
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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 *
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codec_identifier_new (const gchar * filename)
{
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CodecIdentifier *cip;
GstTypeFind *tfp;
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cip = g_slice_new0 (CodecIdentifier);
if (!cip)
return NULL;
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cip->file = g_mapped_file_new (filename, FALSE, NULL);
if (!cip->file)
goto error;
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cip->size = g_mapped_file_get_length (cip->file);
cip->data = (guint8 *) g_mapped_file_get_contents (cip->file);
if (!cip->data)
goto error;
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tfp = &cip->type_find;
tfp->peek = codec_identifier_peek;
tfp->suggest = codec_identifier_suggest;
tfp->data = cip;
return cip;
error:
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codec_identifier_free (cip);
return NULL;
}
GstVaapiCodec
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identify_codec (const gchar * filename)
{
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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);
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if (cip->probability >= GST_TYPE_FIND_LIKELY)
codec =
gst_vaapi_profile_get_codec (gst_vaapi_profile_from_caps (cip->caps));
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codec_identifier_free (cip);
return codec;
}