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158 lines
5.1 KiB
C
158 lines
5.1 KiB
C
/* VP8
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* Copyright (C) 2006 David Schleef <ds@schleef.org>
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* Copyright (C) 2008,2009,2010 Entropy Wave Inc
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* Copyright (C) 2010-2012 Sebastian Dröge <sebastian.droege@collabora.co.uk>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*
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*/
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/**
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* SECTION:element-vp8dec
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* @see_also: vp8enc, matroskademux
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*
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* This element decodes VP8 streams into raw video.
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* <ulink url="http://www.webmproject.org">VP8</ulink> is a royalty-free
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* video codec maintained by <ulink url="http://www.google.com/">Google
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* </ulink>. It's the successor of On2 VP3, which was the base of the
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* Theora video codec.
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*
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* <refsect2>
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* <title>Example pipeline</title>
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* |[
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* gst-launch-1.0 -v filesrc location=videotestsrc.webm ! matroskademux ! vp8dec ! videoconvert ! videoscale ! autovideosink
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* ]| This example pipeline will decode a WebM stream and decodes the VP8 video.
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* </refsect2>
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#ifdef HAVE_VP8_DECODER
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#include <string.h>
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#include "gstvp8dec.h"
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#include "gstvp8utils.h"
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#include <gst/video/gstvideometa.h>
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#include <gst/video/gstvideopool.h>
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GST_DEBUG_CATEGORY_STATIC (gst_vp8dec_debug);
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#define GST_CAT_DEFAULT gst_vp8dec_debug
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#define VP8_DECODER_VIDEO_TAG "VP8 video"
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static void gst_vp8_dec_set_default_format (GstVPXDec * dec, GstVideoFormat fmt,
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int width, int height);
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static void gst_vp8_dec_handle_resolution_change (GstVPXDec * dec,
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vpx_image_t * img, GstVideoFormat fmt);
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static GstStaticPadTemplate gst_vp8_dec_sink_template =
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GST_STATIC_PAD_TEMPLATE ("sink",
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GST_PAD_SINK,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("video/x-vp8")
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);
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static GstStaticPadTemplate gst_vp8_dec_src_template =
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GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE ("I420"))
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);
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#define parent_class gst_vp8_dec_parent_class
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G_DEFINE_TYPE (GstVP8Dec, gst_vp8_dec, GST_TYPE_VPX_DEC);
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static void
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gst_vp8_dec_class_init (GstVP8DecClass * klass)
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{
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GstElementClass *element_class;
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GstVPXDecClass *vpx_class;
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element_class = GST_ELEMENT_CLASS (klass);
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vpx_class = GST_VPX_DEC_CLASS (klass);
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&gst_vp8_dec_sink_template));
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&gst_vp8_dec_src_template));
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gst_element_class_set_static_metadata (element_class,
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"On2 VP8 Decoder",
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"Codec/Decoder/Video",
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"Decode VP8 video streams", "David Schleef <ds@entropywave.com>, "
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"Sebastian Dröge <sebastian.droege@collabora.co.uk>");
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vpx_class->video_codec_tag = VP8_DECODER_VIDEO_TAG;
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vpx_class->codec_algo = &vpx_codec_vp8_dx_algo;
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vpx_class->set_default_format =
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GST_DEBUG_FUNCPTR (gst_vp8_dec_set_default_format);
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vpx_class->handle_resolution_change =
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GST_DEBUG_FUNCPTR (gst_vp8_dec_handle_resolution_change);
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GST_DEBUG_CATEGORY_INIT (gst_vp8dec_debug, "vp8dec", 0, "VP8 Decoder");
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}
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static void
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gst_vp8_dec_init (GstVP8Dec * gst_vp8_dec)
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{
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GST_DEBUG_OBJECT (gst_vp8_dec, "gst_vp8_dec_init");
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}
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static void
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gst_vp8_dec_set_default_format (GstVPXDec * dec, GstVideoFormat fmt, int width,
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int height)
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{
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GstVPXDecClass *vpxclass = GST_VPX_DEC_GET_CLASS (dec);
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g_assert (dec->output_state == NULL);
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dec->output_state =
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gst_video_decoder_set_output_state (GST_VIDEO_DECODER (dec),
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GST_VIDEO_FORMAT_I420, width, height, dec->input_state);
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gst_video_decoder_negotiate (GST_VIDEO_DECODER (dec));
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vpxclass->send_tags (dec);
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}
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static void
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gst_vp8_dec_handle_resolution_change (GstVPXDec * dec, vpx_image_t * img,
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GstVideoFormat fmt)
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{
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GstVideoInfo *info;
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GstVideoCodecState *new_output_state;
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info = &dec->output_state->info;
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if (GST_VIDEO_INFO_WIDTH (info) != img->d_w
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|| GST_VIDEO_INFO_HEIGHT (info) != img->d_h) {
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GST_DEBUG_OBJECT (dec,
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"Changed output resolution was %d x %d now is got %u x %u (display %u x %u)",
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GST_VIDEO_INFO_WIDTH (info), GST_VIDEO_INFO_HEIGHT (info), img->w,
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img->h, img->d_w, img->d_h);
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new_output_state =
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gst_video_decoder_set_output_state (GST_VIDEO_DECODER (dec),
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GST_VIDEO_FORMAT_I420, img->d_w, img->d_h, dec->output_state);
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if (dec->output_state) {
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gst_video_codec_state_unref (dec->output_state);
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}
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dec->output_state = new_output_state;
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/* No need to call negotiate() here, it will be automatically called
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* by allocate_output_frame()*/
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}
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}
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#endif /* HAVE_VP8_DECODER */
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