gstreamer/gst/videoparsers/gstdiracparse.c

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/* GStreamer
* Copyright (C) 2010 David Schleef <ds@schleef.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/**
* SECTION:element-gstdiracparse
*
* The gstdiracparse element does FIXME stuff.
*
* <refsect2>
* <title>Example launch line</title>
* |[
* gst-launch -v fakesrc ! gstdiracparse ! FIXME ! fakesink
* ]|
* FIXME Describe what the pipeline does.
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst.h>
#include <gst/base/gstbytereader.h>
#include "gstdiracparse.h"
/* prototypes */
static void gst_dirac_parse_set_property (GObject * object,
guint property_id, const GValue * value, GParamSpec * pspec);
static void gst_dirac_parse_get_property (GObject * object,
guint property_id, GValue * value, GParamSpec * pspec);
static void gst_dirac_parse_dispose (GObject * object);
static void gst_dirac_parse_finalize (GObject * object);
static gboolean gst_dirac_parse_start (GstBaseParse * parse);
static gboolean gst_dirac_parse_stop (GstBaseParse * parse);
static gboolean gst_dirac_parse_set_sink_caps (GstBaseParse * parse,
GstCaps * caps);
static gboolean gst_dirac_parse_check_valid_frame (GstBaseParse * parse,
GstBaseParseFrame * frame, guint * framesize, gint * skipsize);
static GstFlowReturn gst_dirac_parse_parse_frame (GstBaseParse * parse,
GstBaseParseFrame * frame);
static gboolean gst_dirac_parse_convert (GstBaseParse * parse,
GstFormat src_format, gint64 src_value, GstFormat dest_format,
gint64 * dest_value);
static gboolean gst_dirac_parse_event (GstBaseParse * parse, GstEvent * event);
static gboolean gst_dirac_parse_src_event (GstBaseParse * parse,
GstEvent * event);
static GstFlowReturn gst_dirac_parse_pre_push_frame (GstBaseParse * parse,
GstBaseParseFrame * frame);
enum
{
PROP_0
};
/* pad templates */
static GstStaticPadTemplate gst_dirac_parse_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-dirac, parsed=(boolean)FALSE")
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);
static GstStaticPadTemplate gst_dirac_parse_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-dirac, parsed=(boolean)TRUE")
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);
/* class initialization */
GST_BOILERPLATE (GstDiracParse, gst_dirac_parse, GstBaseParse,
GST_TYPE_BASE_PARSE);
static void
gst_dirac_parse_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_dirac_parse_src_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_dirac_parse_sink_template));
gst_element_class_set_details_simple (element_class, "Dirac parser",
"Codec/Parser/Video", "Parses Dirac streams",
"David Schleef <ds@schleef.org>");
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}
static void
gst_dirac_parse_class_init (GstDiracParseClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GstBaseParseClass *base_parse_class = GST_BASE_PARSE_CLASS (klass);
gobject_class->set_property = gst_dirac_parse_set_property;
gobject_class->get_property = gst_dirac_parse_get_property;
gobject_class->dispose = gst_dirac_parse_dispose;
gobject_class->finalize = gst_dirac_parse_finalize;
base_parse_class->start = GST_DEBUG_FUNCPTR (gst_dirac_parse_start);
base_parse_class->stop = GST_DEBUG_FUNCPTR (gst_dirac_parse_stop);
base_parse_class->set_sink_caps =
GST_DEBUG_FUNCPTR (gst_dirac_parse_set_sink_caps);
base_parse_class->check_valid_frame =
GST_DEBUG_FUNCPTR (gst_dirac_parse_check_valid_frame);
base_parse_class->parse_frame =
GST_DEBUG_FUNCPTR (gst_dirac_parse_parse_frame);
base_parse_class->convert = GST_DEBUG_FUNCPTR (gst_dirac_parse_convert);
base_parse_class->event = GST_DEBUG_FUNCPTR (gst_dirac_parse_event);
base_parse_class->src_event = GST_DEBUG_FUNCPTR (gst_dirac_parse_src_event);
base_parse_class->pre_push_frame =
GST_DEBUG_FUNCPTR (gst_dirac_parse_pre_push_frame);
}
static void
gst_dirac_parse_init (GstDiracParse * diracparse,
GstDiracParseClass * diracparse_class)
{
gst_base_parse_set_min_frame_size (GST_BASE_PARSE (diracparse), 13);
}
void
gst_dirac_parse_set_property (GObject * object, guint property_id,
const GValue * value, GParamSpec * pspec)
{
g_return_if_fail (GST_IS_DIRAC_PARSE (object));
switch (property_id) {
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
void
gst_dirac_parse_get_property (GObject * object, guint property_id,
GValue * value, GParamSpec * pspec)
{
g_return_if_fail (GST_IS_DIRAC_PARSE (object));
switch (property_id) {
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
void
gst_dirac_parse_dispose (GObject * object)
{
g_return_if_fail (GST_IS_DIRAC_PARSE (object));
/* clean up as possible. may be called multiple times */
G_OBJECT_CLASS (parent_class)->dispose (object);
}
void
gst_dirac_parse_finalize (GObject * object)
{
g_return_if_fail (GST_IS_DIRAC_PARSE (object));
/* clean up object here */
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static gboolean
gst_dirac_parse_start (GstBaseParse * parse)
{
return TRUE;
}
static gboolean
gst_dirac_parse_stop (GstBaseParse * parse)
{
return TRUE;
}
static gboolean
gst_dirac_parse_set_sink_caps (GstBaseParse * parse, GstCaps * caps)
{
/* Called when sink caps are set */
return TRUE;
}
static gboolean
gst_dirac_parse_frame_header (GstDiracParse * diracparse,
GstBuffer * buffer, guint * framesize)
{
int next_header;
next_header = GST_READ_UINT32_BE (GST_BUFFER_DATA (buffer) + 5);
*framesize = next_header;
return TRUE;
}
static gboolean
gst_dirac_parse_check_valid_frame (GstBaseParse * parse,
GstBaseParseFrame * frame, guint * framesize, gint * skipsize)
{
GstByteReader reader = GST_BYTE_READER_INIT_FROM_BUFFER (frame->buffer);
GstDiracParse *diracparse = GST_DIRAC_PARSE (parse);
int off;
guint32 next_header;
gboolean lost_sync;
gboolean draining;
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if (G_UNLIKELY (GST_BUFFER_SIZE (frame->buffer) < 13))
return FALSE;
off = gst_byte_reader_masked_scan_uint32 (&reader, 0xffffffff,
0x42424344, 0, GST_BUFFER_SIZE (frame->buffer));
if (off < 0) {
*skipsize = GST_BUFFER_SIZE (frame->buffer) - 3;
return FALSE;
}
GST_LOG_OBJECT (parse, "possible sync at buffer offset %d", off);
if (off > 0) {
GST_ERROR ("skipping %d", off);
*skipsize = off;
return FALSE;
}
if (!gst_dirac_parse_frame_header (diracparse, frame->buffer, framesize)) {
GST_ERROR ("bad header");
*skipsize = 3;
return FALSE;
}
GST_LOG ("framesize %d", *framesize);
lost_sync = GST_BASE_PARSE_LOST_SYNC (frame);
draining = GST_BASE_PARSE_DRAINING (frame);
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if (lost_sync && !draining) {
guint32 next_sync_word = 0;
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next_header = GST_READ_UINT32_BE (GST_BUFFER_DATA (frame->buffer) + 5);
GST_LOG ("next header %d", next_header);
if (!gst_byte_reader_skip (&reader, next_header) ||
!gst_byte_reader_get_uint32_be (&reader, &next_sync_word)) {
gst_base_parse_set_min_frame_size (parse, next_header + 4);
*skipsize = 0;
return FALSE;
} else {
if (next_sync_word != 0x42424344) {
*skipsize = 3;
return FALSE;
} else {
gst_base_parse_set_min_frame_size (parse, next_header);
}
}
}
return TRUE;
}
static GstFlowReturn
gst_dirac_parse_parse_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
{
//GstDiracParse * diracparse = GST_DIRAC_PARSE (parse);
/* Called when processing incoming buffers. Function should parse
a checked frame. */
/* MUST implement */
if (GST_PAD_CAPS (GST_BASE_PARSE_SRC_PAD (parse)) == NULL) {
GstCaps *caps = gst_caps_new_simple ("video/x-dirac", NULL);
gst_buffer_set_caps (frame->buffer, caps);
gst_pad_set_caps (GST_BASE_PARSE_SRC_PAD (parse), caps);
gst_caps_unref (caps);
}
gst_base_parse_set_min_frame_size (parse, 13);
return GST_FLOW_OK;
}
static gboolean
gst_dirac_parse_convert (GstBaseParse * parse, GstFormat src_format,
gint64 src_value, GstFormat dest_format, gint64 * dest_value)
{
/* Convert between formats */
return FALSE;
}
static gboolean
gst_dirac_parse_event (GstBaseParse * parse, GstEvent * event)
{
/* Sink pad event handler */
return FALSE;
}
static gboolean
gst_dirac_parse_src_event (GstBaseParse * parse, GstEvent * event)
{
/* Src pad event handler */
return FALSE;
}
static GstFlowReturn
gst_dirac_parse_pre_push_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
{
return GST_FLOW_OK;
}