gstreamer/gst-libs/gst/video/gstbasevideocodec.c

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/* GStreamer
* Copyright (C) 2006 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
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/**
* SECTION:gstbasevideocodec
* @short_description: Base class for video codecs
* @see_also: #GstBaseVideoDecoder , #GstBaseVideoEncoder
*/
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/* FIXME 0.11: suppress warnings for deprecated API such as GStaticRecMutex
* with newer GLib versions (>= 2.31.0) */
#define GLIB_DISABLE_DEPRECATION_WARNINGS
#include "gstbasevideocodec.h"
#include <string.h>
#include <math.h>
GST_DEBUG_CATEGORY (basevideocodec_debug);
#define GST_CAT_DEFAULT basevideocodec_debug
/* GstBaseVideoCodec signals and args */
enum
{
LAST_SIGNAL
};
enum
{
ARG_0
};
static void gst_base_video_codec_finalize (GObject * object);
static GstStateChangeReturn gst_base_video_codec_change_state (GstElement *
element, GstStateChange transition);
GType
gst_video_frame_get_type (void)
{
static volatile gsize type = 0;
if (g_once_init_enter (&type)) {
GType _type;
_type = g_boxed_type_register_static ("GstVideoFrame",
(GBoxedCopyFunc) gst_video_frame_ref,
(GBoxedFreeFunc) gst_video_frame_unref);
g_once_init_leave (&type, _type);
}
return (GType) type;
}
GST_BOILERPLATE (GstBaseVideoCodec, gst_base_video_codec, GstElement,
GST_TYPE_ELEMENT);
static void
gst_base_video_codec_base_init (gpointer g_class)
{
GST_DEBUG_CATEGORY_INIT (basevideocodec_debug, "basevideocodec", 0,
"Base Video Codec");
}
static void
gst_base_video_codec_class_init (GstBaseVideoCodecClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *element_class;
gobject_class = G_OBJECT_CLASS (klass);
element_class = GST_ELEMENT_CLASS (klass);
gobject_class->finalize = gst_base_video_codec_finalize;
element_class->change_state = gst_base_video_codec_change_state;
}
static void
gst_base_video_codec_init (GstBaseVideoCodec * base_video_codec,
GstBaseVideoCodecClass * klass)
{
GstPadTemplate *pad_template;
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GST_DEBUG_OBJECT (base_video_codec, "gst_base_video_codec_init");
pad_template =
gst_element_class_get_pad_template (GST_ELEMENT_CLASS (klass), "sink");
g_return_if_fail (pad_template != NULL);
base_video_codec->sinkpad = gst_pad_new_from_template (pad_template, "sink");
gst_element_add_pad (GST_ELEMENT (base_video_codec),
base_video_codec->sinkpad);
pad_template =
gst_element_class_get_pad_template (GST_ELEMENT_CLASS (klass), "src");
g_return_if_fail (pad_template != NULL);
base_video_codec->srcpad = gst_pad_new_from_template (pad_template, "src");
gst_element_add_pad (GST_ELEMENT (base_video_codec),
base_video_codec->srcpad);
gst_segment_init (&base_video_codec->segment, GST_FORMAT_TIME);
g_static_rec_mutex_init (&base_video_codec->stream_lock);
}
static void
gst_base_video_codec_reset (GstBaseVideoCodec * base_video_codec)
{
GList *g;
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GST_DEBUG_OBJECT (base_video_codec, "reset");
GST_BASE_VIDEO_CODEC_STREAM_LOCK (base_video_codec);
for (g = base_video_codec->frames; g; g = g_list_next (g)) {
gst_video_frame_unref ((GstVideoFrame *) g->data);
}
g_list_free (base_video_codec->frames);
base_video_codec->frames = NULL;
base_video_codec->bytes = 0;
base_video_codec->time = 0;
gst_buffer_replace (&base_video_codec->state.codec_data, NULL);
gst_caps_replace (&base_video_codec->state.caps, NULL);
memset (&base_video_codec->state, 0, sizeof (GstVideoState));
base_video_codec->state.format = GST_VIDEO_FORMAT_UNKNOWN;
GST_BASE_VIDEO_CODEC_STREAM_UNLOCK (base_video_codec);
}
static void
gst_base_video_codec_finalize (GObject * object)
{
GstBaseVideoCodec *base_video_codec = GST_BASE_VIDEO_CODEC (object);
g_static_rec_mutex_free (&base_video_codec->stream_lock);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static GstStateChangeReturn
gst_base_video_codec_change_state (GstElement * element,
GstStateChange transition)
{
GstBaseVideoCodec *base_video_codec = GST_BASE_VIDEO_CODEC (element);
GstStateChangeReturn ret;
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
gst_base_video_codec_reset (base_video_codec);
break;
case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
break;
default:
break;
}
ret = parent_class->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
gst_base_video_codec_reset (base_video_codec);
break;
case GST_STATE_CHANGE_READY_TO_NULL:
break;
default:
break;
}
return ret;
}
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/**
* gst_base_video_codec_new_frame:
* @base_video_codec: a #GstBaseVideoCodec
*
* Create a new blank #GstVideoFrame.
*
* Returns: (transfer full): a new #GstVideoFrame
*/
GstVideoFrame *
gst_base_video_codec_new_frame (GstBaseVideoCodec * base_video_codec)
{
GstVideoFrame *frame;
frame = g_slice_new0 (GstVideoFrame);
frame->ref_count = 1;
GST_BASE_VIDEO_CODEC_STREAM_LOCK (base_video_codec);
frame->system_frame_number = base_video_codec->system_frame_number;
base_video_codec->system_frame_number++;
GST_BASE_VIDEO_CODEC_STREAM_UNLOCK (base_video_codec);
GST_LOG_OBJECT (base_video_codec, "Created new frame %p (sfn:%d)",
frame, frame->system_frame_number);
return frame;
}
static void
_gst_video_frame_free (GstVideoFrame * frame)
{
g_return_if_fail (frame != NULL);
if (frame->sink_buffer) {
gst_buffer_unref (frame->sink_buffer);
}
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if (frame->src_buffer) {
gst_buffer_unref (frame->src_buffer);
}
g_list_foreach (frame->events, (GFunc) gst_event_unref, NULL);
g_list_free (frame->events);
if (frame->coder_hook_destroy_notify && frame->coder_hook)
frame->coder_hook_destroy_notify (frame->coder_hook);
g_slice_free (GstVideoFrame, frame);
}
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/**
* gst_video_frame_ref:
* @frame: a #GstVideoFrame
*
* Increases the refcount of the given frame by one.
*
* Returns: @buf
*/
GstVideoFrame *
gst_video_frame_ref (GstVideoFrame * frame)
{
g_return_val_if_fail (frame != NULL, NULL);
g_atomic_int_inc (&frame->ref_count);
return frame;
}
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/**
* gst_video_frame_unref:
* @frame: a #GstVideoFrame
*
* Decreases the refcount of the frame. If the refcount reaches 0, the frame
* will be freed.
*/
void
gst_video_frame_unref (GstVideoFrame * frame)
{
g_return_if_fail (frame != NULL);
g_return_if_fail (frame->ref_count > 0);
if (g_atomic_int_dec_and_test (&frame->ref_count)) {
_gst_video_frame_free (frame);
}
}