gstreamer/subprojects/gst-plugins-good/ext/vpx/gstvp8dec.c

168 lines
5.4 KiB
C

/* VP8
* Copyright (C) 2006 David Schleef <ds@schleef.org>
* Copyright (C) 2008,2009,2010 Entropy Wave Inc
* Copyright (C) 2010-2012 Sebastian Dröge <sebastian.droege@collabora.co.uk>
*
* 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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
/**
* SECTION:element-vp8dec
* @title: vp8dec
* @see_also: vp8enc, matroskademux
*
* This element decodes VP8 streams into raw video.
* [VP8](http://www.webmproject.org) is a royalty-free video codec maintained by
* [Google](http://www.google.com/). It's the successor of On2 VP3, which was
* the base of the Theora video codec.
*
* ## Example pipeline
* |[
* gst-launch-1.0 -v filesrc location=videotestsrc.webm ! matroskademux ! vp8dec ! videoconvert ! videoscale ! autovideosink
* ]| This example pipeline will decode a WebM stream and decodes the VP8 video.
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#ifdef HAVE_VP8_DECODER
#include <string.h>
#include "gstvpxelements.h"
#include "gstvp8dec.h"
#include "gstvp8utils.h"
#include <gst/video/gstvideometa.h>
#include <gst/video/gstvideopool.h>
GST_DEBUG_CATEGORY_STATIC (gst_vp8dec_debug);
#define GST_CAT_DEFAULT gst_vp8dec_debug
#define VP8_DECODER_VIDEO_TAG "VP8 video"
static void gst_vp8_dec_set_default_format (GstVPXDec * dec, GstVideoFormat fmt,
int width, int height);
static void gst_vp8_dec_handle_resolution_change (GstVPXDec * dec,
vpx_image_t * img, GstVideoFormat fmt);
static gboolean gst_vp8_dec_get_needs_sync_point (GstVPXDec * dec);
static GstStaticPadTemplate gst_vp8_dec_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-vp8")
);
static GstStaticPadTemplate gst_vp8_dec_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE ("I420"))
);
#define parent_class gst_vp8_dec_parent_class
G_DEFINE_TYPE (GstVP8Dec, gst_vp8_dec, GST_TYPE_VPX_DEC);
GST_ELEMENT_REGISTER_DEFINE_WITH_CODE (vp8dec, "vp8dec", GST_RANK_PRIMARY,
gst_vp8_dec_get_type (), vpx_element_init (plugin));
static void
gst_vp8_dec_class_init (GstVP8DecClass * klass)
{
GstElementClass *element_class;
GstVPXDecClass *vpx_class;
element_class = GST_ELEMENT_CLASS (klass);
vpx_class = GST_VPX_DEC_CLASS (klass);
gst_element_class_add_static_pad_template (element_class,
&gst_vp8_dec_sink_template);
gst_element_class_add_static_pad_template (element_class,
&gst_vp8_dec_src_template);
gst_element_class_set_static_metadata (element_class,
"On2 VP8 Decoder",
"Codec/Decoder/Video",
"Decode VP8 video streams", "David Schleef <ds@entropywave.com>, "
"Sebastian Dröge <sebastian.droege@collabora.co.uk>");
vpx_class->video_codec_tag = VP8_DECODER_VIDEO_TAG;
vpx_class->codec_algo = &vpx_codec_vp8_dx_algo;
vpx_class->set_default_format =
GST_DEBUG_FUNCPTR (gst_vp8_dec_set_default_format);
vpx_class->handle_resolution_change =
GST_DEBUG_FUNCPTR (gst_vp8_dec_handle_resolution_change);
vpx_class->get_needs_sync_point =
GST_DEBUG_FUNCPTR (gst_vp8_dec_get_needs_sync_point);
GST_DEBUG_CATEGORY_INIT (gst_vp8dec_debug, "vp8dec", 0, "VP8 Decoder");
}
static void
gst_vp8_dec_init (GstVP8Dec * gst_vp8_dec)
{
GST_DEBUG_OBJECT (gst_vp8_dec, "gst_vp8_dec_init");
}
static void
gst_vp8_dec_set_default_format (GstVPXDec * dec, GstVideoFormat fmt, int width,
int height)
{
GstVPXDecClass *vpxclass = GST_VPX_DEC_GET_CLASS (dec);
g_assert (dec->output_state == NULL);
dec->output_state =
gst_video_decoder_set_output_state (GST_VIDEO_DECODER (dec),
GST_VIDEO_FORMAT_I420, width, height, dec->input_state);
gst_video_decoder_negotiate (GST_VIDEO_DECODER (dec));
vpxclass->send_tags (dec);
}
static void
gst_vp8_dec_handle_resolution_change (GstVPXDec * dec, vpx_image_t * img,
GstVideoFormat fmt)
{
GstVideoInfo *info;
GstVideoCodecState *new_output_state;
info = &dec->output_state->info;
if (GST_VIDEO_INFO_WIDTH (info) != img->d_w
|| GST_VIDEO_INFO_HEIGHT (info) != img->d_h) {
GST_DEBUG_OBJECT (dec,
"Changed output resolution was %d x %d now is got %u x %u (display %u x %u)",
GST_VIDEO_INFO_WIDTH (info), GST_VIDEO_INFO_HEIGHT (info), img->w,
img->h, img->d_w, img->d_h);
new_output_state =
gst_video_decoder_set_output_state (GST_VIDEO_DECODER (dec),
GST_VIDEO_FORMAT_I420, img->d_w, img->d_h, dec->output_state);
if (dec->output_state) {
gst_video_codec_state_unref (dec->output_state);
}
dec->output_state = new_output_state;
/* No need to call negotiate() here, it will be automatically called
* by allocate_output_frame()*/
}
}
static gboolean
gst_vp8_dec_get_needs_sync_point (GstVPXDec * dec)
{
return FALSE;
}
#endif /* HAVE_VP8_DECODER */