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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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333 lines
8.7 KiB
C
333 lines
8.7 KiB
C
/* GStreamer
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* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
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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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* SECTION:element-smokedec
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* @title: smokedec
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*
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* Decodes images in smoke format.
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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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#include <string.h>
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/*#define DEBUG_ENABLED*/
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#include "gstsmokedec.h"
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#include <gst/video/video.h>
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GST_DEBUG_CATEGORY_STATIC (smokedec_debug);
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#define GST_CAT_DEFAULT smokedec_debug
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/* SmokeDec signals and args */
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enum
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{
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LAST_SIGNAL
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};
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enum
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{
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PROP_0
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};
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static void gst_smokedec_base_init (gpointer g_class);
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static void gst_smokedec_class_init (GstSmokeDec * klass);
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static void gst_smokedec_init (GstSmokeDec * smokedec);
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static void gst_smokedec_finalize (GObject * object);
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static GstStateChangeReturn
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gst_smokedec_change_state (GstElement * element, GstStateChange transition);
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static GstFlowReturn gst_smokedec_chain (GstPad * pad, GstBuffer * buf);
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static GstElementClass *parent_class = NULL;
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/*static guint gst_smokedec_signals[LAST_SIGNAL] = { 0 }; */
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GType
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gst_smokedec_get_type (void)
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{
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static GType smokedec_type = 0;
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if (!smokedec_type) {
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static const GTypeInfo smokedec_info = {
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sizeof (GstSmokeDecClass),
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gst_smokedec_base_init,
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NULL,
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(GClassInitFunc) gst_smokedec_class_init,
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NULL,
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NULL,
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sizeof (GstSmokeDec),
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0,
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(GInstanceInitFunc) gst_smokedec_init,
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};
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smokedec_type =
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g_type_register_static (GST_TYPE_ELEMENT, "GstSmokeDec", &smokedec_info,
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0);
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}
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return smokedec_type;
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}
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static GstStaticPadTemplate gst_smokedec_src_pad_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_YUV ("I420"))
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);
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static GstStaticPadTemplate gst_smokedec_sink_pad_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-smoke, "
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"width = (int) [ 16, 4096 ], "
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"height = (int) [ 16, 4096 ], " "framerate = (fraction) [ 0/1, MAX ]")
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);
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static void
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gst_smokedec_base_init (gpointer g_class)
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{
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GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
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gst_element_class_add_static_pad_template (element_class,
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&gst_smokedec_src_pad_template);
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gst_element_class_add_static_pad_template (element_class,
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&gst_smokedec_sink_pad_template);
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gst_element_class_set_static_metadata (element_class, "Smoke video decoder",
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"Codec/Decoder/Video", "Decode video from Smoke format",
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"Wim Taymans <wim@fluendo.com>");
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}
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static void
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gst_smokedec_class_init (GstSmokeDec * klass)
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{
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GObjectClass *gobject_class;
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GstElementClass *gstelement_class;
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gobject_class = (GObjectClass *) klass;
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gstelement_class = (GstElementClass *) klass;
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parent_class = g_type_class_peek_parent (klass);
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gobject_class->finalize = gst_smokedec_finalize;
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gstelement_class->change_state =
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GST_DEBUG_FUNCPTR (gst_smokedec_change_state);
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GST_DEBUG_CATEGORY_INIT (smokedec_debug, "smokedec", 0, "Smoke decoder");
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}
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static void
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gst_smokedec_init (GstSmokeDec * smokedec)
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{
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GST_DEBUG_OBJECT (smokedec, "gst_smokedec_init: initializing");
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/* create the sink and src pads */
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smokedec->sinkpad =
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gst_pad_new_from_static_template (&gst_smokedec_sink_pad_template,
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"sink");
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gst_pad_set_chain_function (smokedec->sinkpad, gst_smokedec_chain);
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gst_element_add_pad (GST_ELEMENT (smokedec), smokedec->sinkpad);
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smokedec->srcpad =
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gst_pad_new_from_static_template (&gst_smokedec_src_pad_template, "src");
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gst_pad_use_fixed_caps (smokedec->srcpad);
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gst_element_add_pad (GST_ELEMENT (smokedec), smokedec->srcpad);
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smokecodec_decode_new (&smokedec->info);
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}
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static void
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gst_smokedec_finalize (GObject * object)
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{
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GstSmokeDec *dec = GST_SMOKEDEC (object);
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smokecodec_info_free (dec->info);
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G_OBJECT_CLASS (parent_class)->finalize (object);
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}
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static GstFlowReturn
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gst_smokedec_chain (GstPad * pad, GstBuffer * buf)
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{
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GstSmokeDec *smokedec;
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guint8 *data, *outdata;
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gulong size, outsize;
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GstBuffer *outbuf;
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SmokeCodecFlags flags;
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GstClockTime time;
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guint width, height;
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guint fps_num, fps_denom;
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gint smokeret;
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GstFlowReturn ret;
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smokedec = GST_SMOKEDEC (gst_pad_get_parent (pad));
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data = GST_BUFFER_DATA (buf);
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size = GST_BUFFER_SIZE (buf);
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time = GST_BUFFER_TIMESTAMP (buf);
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if (size < 1)
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goto too_small;
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GST_LOG_OBJECT (smokedec, "got buffer of %lu bytes", size);
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/* have the ID packet. */
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if (data[0] == SMOKECODEC_TYPE_ID) {
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smokeret = smokecodec_parse_id (smokedec->info, data, size);
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if (smokeret != SMOKECODEC_OK)
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goto header_error;
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ret = GST_FLOW_OK;
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goto done;
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}
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/* now handle data packets */
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GST_DEBUG_OBJECT (smokedec, "reading header %08lx", *(gulong *) data);
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smokecodec_parse_header (smokedec->info, data, size, &flags, &width, &height,
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&fps_num, &fps_denom);
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if (smokedec->height != height || smokedec->width != width ||
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smokedec->fps_num != fps_num || smokedec->fps_denom != fps_denom) {
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GstCaps *caps;
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GST_DEBUG_OBJECT (smokedec, "parameter change: %dx%d @ %d/%dfps",
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width, height, fps_num, fps_denom);
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smokedec->height = height;
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smokedec->width = width;
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caps = gst_caps_new_simple ("video/x-raw-yuv",
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"format", GST_TYPE_FOURCC, GST_MAKE_FOURCC ('I', '4', '2', '0'),
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"width", G_TYPE_INT, width,
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"height", G_TYPE_INT, height,
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"framerate", GST_TYPE_FRACTION, fps_num, fps_denom, NULL);
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gst_pad_set_caps (smokedec->srcpad, caps);
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gst_caps_unref (caps);
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}
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if (smokedec->need_keyframe) {
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if (!(flags & SMOKECODEC_KEYFRAME))
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goto keyframe_skip;
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smokedec->need_keyframe = FALSE;
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}
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outsize = width * height + width * height / 2;
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outbuf = gst_buffer_new_and_alloc (outsize);
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outdata = GST_BUFFER_DATA (outbuf);
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GST_BUFFER_DURATION (outbuf) =
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gst_util_uint64_scale_int (GST_SECOND, fps_denom, fps_num);
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GST_BUFFER_OFFSET (outbuf) = GST_BUFFER_OFFSET (buf);
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gst_buffer_set_caps (outbuf, GST_PAD_CAPS (smokedec->srcpad));
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if (time == GST_CLOCK_TIME_NONE) {
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if (GST_BUFFER_OFFSET (buf) == -1) {
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time = smokedec->next_time;
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} else {
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time = GST_BUFFER_OFFSET (buf) * GST_BUFFER_DURATION (outbuf);
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}
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}
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GST_BUFFER_TIMESTAMP (outbuf) = time;
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if (time != -1)
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smokedec->next_time = time + GST_BUFFER_DURATION (outbuf);
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else
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smokedec->next_time = -1;
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smokeret = smokecodec_decode (smokedec->info, data, size, outdata);
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if (smokeret != SMOKECODEC_OK)
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goto decode_error;
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GST_DEBUG_OBJECT (smokedec, "gst_smokedec_chain: sending buffer");
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ret = gst_pad_push (smokedec->srcpad, outbuf);
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done:
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gst_buffer_unref (buf);
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gst_object_unref (smokedec);
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return ret;
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/* ERRORS */
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too_small:
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{
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GST_ELEMENT_ERROR (smokedec, STREAM, DECODE,
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(NULL), ("Input buffer too small"));
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ret = GST_FLOW_ERROR;
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goto done;
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}
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header_error:
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{
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GST_ELEMENT_ERROR (smokedec, STREAM, DECODE,
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(NULL), ("Could not parse smoke header, reason: %d", smokeret));
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ret = GST_FLOW_ERROR;
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goto done;
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}
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keyframe_skip:
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{
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GST_DEBUG_OBJECT (smokedec, "dropping buffer while waiting for keyframe");
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ret = GST_FLOW_OK;
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goto done;
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}
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decode_error:
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{
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GST_ELEMENT_ERROR (smokedec, STREAM, DECODE,
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(NULL), ("Could not decode smoke frame, reason: %d", smokeret));
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ret = GST_FLOW_ERROR;
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goto done;
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}
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}
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static GstStateChangeReturn
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gst_smokedec_change_state (GstElement * element, GstStateChange transition)
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{
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GstStateChangeReturn ret;
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GstSmokeDec *dec;
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dec = GST_SMOKEDEC (element);
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switch (transition) {
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case GST_STATE_CHANGE_READY_TO_PAUSED:
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/* reset the initial video state */
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dec->format = -1;
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dec->width = -1;
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dec->height = -1;
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dec->fps_num = -1;
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dec->fps_denom = -1;
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dec->next_time = 0;
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default:
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break;
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}
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ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
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if (ret != GST_STATE_CHANGE_SUCCESS)
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return ret;
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switch (transition) {
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case GST_STATE_CHANGE_PAUSED_TO_READY:
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break;
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default:
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break;
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}
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return ret;
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}
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