mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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1d5f318e0d
Original commit message from CVS: plugins part of license field patch
444 lines
12 KiB
C
444 lines
12 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., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/*#define DEBUG_ENABLED */
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#include <gstmpeg2subt.h>
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static void gst_mpeg2subt_class_init (GstMpeg2SubtClass *klass);
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static void gst_mpeg2subt_init (GstMpeg2Subt *mpeg2subt);
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static void gst_mpeg2subt_chain_video (GstPad *pad,GstBuffer *buf);
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static void gst_mpeg2subt_chain_subtitle (GstPad *pad,GstBuffer *buf);
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static void gst_mpeg2subt_merge_title (GstMpeg2Subt *mpeg2subt, GstBuffer *buf);
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static void gst_mpeg2subt_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec);
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static void gst_mpeg2subt_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec);
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/* elementfactory information */
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static GstElementDetails mpeg2subt_details = {
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"MPEG2 subtitle Decoder",
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"Codec/Video/Decoder",
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"LGPL",
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"Decodes and merges MPEG2 subtitles into a video frame",
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VERSION,
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"Samuel Hocevar <sam@via.ecp.fr>\n"
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"Michel Lespinasse <walken@via.ecp.fr>\n"
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"Wim Taymans <wim.taymans@chello.be>",
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"(C) 2000",
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};
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/* defined but not used
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static GstTypeDefinition mpeg2subtitledefinition = {
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"mpeg2subt_video/mpeg2ubtitle",
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"video/mpeg2subtitle",
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NULL,
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NULL,
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};
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*/
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/* GstMpeg2Subt signals and args */
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enum {
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/* FILL ME */
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LAST_SIGNAL
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};
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enum {
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ARG_0,
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ARG_SKIP,
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/* FILL ME */
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};
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static guchar yuv_color[16] = {
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0x99,
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0x00,
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0xFF,
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0x00,
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0x40,
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0x50,
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0x60,
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0x70,
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0x80,
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0x90,
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0xA0,
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0xB0,
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0xC0,
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0xD0,
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0xE0,
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0xF0
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};
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static GstElementClass *parent_class = NULL;
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/*static guint gst_mpeg2subt_signals[LAST_SIGNAL] = { 0 };*/
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GType
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gst_mpeg2subt_get_type (void)
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{
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static GType mpeg2subt_type = 0;
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if (!mpeg2subt_type) {
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static const GTypeInfo mpeg2subt_info = {
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sizeof(GstMpeg2SubtClass), NULL,
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NULL,
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(GClassInitFunc)gst_mpeg2subt_class_init,
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NULL,
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NULL,
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sizeof(GstMpeg2Subt),
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0,
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(GInstanceInitFunc)gst_mpeg2subt_init,
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};
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mpeg2subt_type = g_type_register_static(GST_TYPE_ELEMENT, "GstMpeg2Subt", &mpeg2subt_info, 0);
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}
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return mpeg2subt_type;
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}
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static void
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gst_mpeg2subt_class_init (GstMpeg2SubtClass *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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g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_SKIP,
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g_param_spec_int("skip","skip","skip",
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G_MININT,G_MAXINT,0,G_PARAM_READWRITE)); /* CHECKME */
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parent_class = g_type_class_ref(GST_TYPE_ELEMENT);
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gobject_class->set_property = gst_mpeg2subt_set_property;
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gobject_class->get_property = gst_mpeg2subt_get_property;
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}
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static void
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gst_mpeg2subt_init (GstMpeg2Subt *mpeg2subt)
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{
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mpeg2subt->videopad = gst_pad_new("video",GST_PAD_SINK);
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gst_element_add_pad(GST_ELEMENT(mpeg2subt),mpeg2subt->videopad);
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gst_pad_set_chain_function(mpeg2subt->videopad,gst_mpeg2subt_chain_video);
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mpeg2subt->subtitlepad = gst_pad_new("subtitle",GST_PAD_SINK);
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gst_element_add_pad(GST_ELEMENT(mpeg2subt),mpeg2subt->subtitlepad);
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gst_pad_set_chain_function(mpeg2subt->subtitlepad,gst_mpeg2subt_chain_subtitle);
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mpeg2subt->srcpad = gst_pad_new("src",GST_PAD_SRC);
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gst_element_add_pad(GST_ELEMENT(mpeg2subt),mpeg2subt->srcpad);
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mpeg2subt->partialbuf = NULL;
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mpeg2subt->have_title = FALSE;
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}
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static void
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gst_mpeg2subt_chain_video (GstPad *pad, GstBuffer *buf)
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{
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GstMpeg2Subt *mpeg2subt;
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guchar *data;
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glong size;
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g_return_if_fail(pad != NULL);
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g_return_if_fail(GST_IS_PAD(pad));
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g_return_if_fail(buf != NULL);
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mpeg2subt = GST_MPEG2SUBT (GST_OBJECT_PARENT (pad));
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data = GST_BUFFER_DATA(buf);
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size = GST_BUFFER_SIZE(buf);
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if (mpeg2subt->have_title && mpeg2subt->duration != 0) {
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gst_mpeg2subt_merge_title(mpeg2subt, buf);
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mpeg2subt->duration--;
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}
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gst_pad_push(mpeg2subt->srcpad, buf);
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}
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static void
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gst_mpeg2subt_parse_header (GstMpeg2Subt *mpeg2subt)
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{
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guchar *buffer = GST_BUFFER_DATA(mpeg2subt->partialbuf);
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guchar dummy;
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guint i;
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i = mpeg2subt->data_size + 4;
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while (i < mpeg2subt->packet_size)
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{
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dummy = buffer [i];
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switch (dummy)
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{
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case 0x01: /* null packet ? */
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i++;
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break;
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case 0x02: /* 02 ff (ff) is the end of the packet */
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i = mpeg2subt->packet_size;
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break;
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case 0x03: /* palette */
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mpeg2subt->color[0] = yuv_color[buffer [i+1] >> 4];
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mpeg2subt->color[1] = yuv_color[buffer [i+1] & 0xf];
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mpeg2subt->color[2] = yuv_color[buffer [i+2] >> 4];
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mpeg2subt->color[3] = yuv_color[buffer [i+2] & 0xf];
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mpeg2subt->color[4] = yuv_color[0xf];
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GST_DEBUG (0,"mpeg2subt: colors %d %d %d %d", mpeg2subt->color[0],mpeg2subt->color[1],mpeg2subt->color[2],mpeg2subt->color[3]);
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i += 3;
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break;
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case 0x04: /* transparency palette */
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mpeg2subt->trans[3] = buffer [i+1] >> 4;
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mpeg2subt->trans[2] = buffer [i+1] & 0xf;
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mpeg2subt->trans[1] = buffer [i+2] >> 4;
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mpeg2subt->trans[0] = buffer [i+2] & 0xf;
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GST_DEBUG (0,"mpeg2subt: transparency %d %d %d %d", mpeg2subt->trans[0],mpeg2subt->trans[1],mpeg2subt->trans[2],mpeg2subt->trans[3]);
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i += 3;
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break;
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case 0x05: /* image coordinates */
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mpeg2subt->width = 1 + ( ((buffer[i+2] & 0x0f) << 8) + buffer[i+3] )
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- ( (((unsigned int)buffer[i+1]) << 4) + (buffer[i+2] >> 4) );
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mpeg2subt->height = 1 + ( ((buffer[i+5] & 0x0f) << 8) + buffer[i+6] )
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- ( (((unsigned int)buffer[i+4]) << 4) + (buffer[i+5] >> 4) );
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i += 7;
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break;
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case 0x06: /* image 1 / image 2 offsets */
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mpeg2subt->offset[0] = (((unsigned int)buffer[i+1]) << 8) + buffer[i+2];
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mpeg2subt->offset[1] = (((unsigned int)buffer[i+3]) << 8) + buffer[i+4];
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i += 5;
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break;
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case 0xff: /* "ff xx yy zz uu" with 'zz uu' == start of control packet
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* xx and yy are the end time in 90th/sec
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*/
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mpeg2subt->duration = (((buffer[i+1] << 8) + buffer[i+2]) * 25)/90;
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GST_DEBUG (0,"duration %d", mpeg2subt->duration);
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if ( (buffer[i+3] != buffer[mpeg2subt->data_size+2])
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|| (buffer[i+4] != buffer[mpeg2subt->data_size+3]) )
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{
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g_print("mpeg2subt: invalid control header (%.2x%.2x != %.2x%.2x) !\n",
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buffer[i+3], buffer[i+4], buffer[mpeg2subt->data_size+2], buffer[mpeg2subt->data_size+3] );
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/* FIXME */
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/* exit(1); */
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}
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i += 5;
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break;
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default:
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g_print("mpeg2subt: invalid sequence in control header (%.2x) !\n", dummy);
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break;
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}
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}
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}
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static int
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get_nibble (guchar *buffer, gint *offset, gint id, gint *aligned)
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{
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static int next;
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if (*aligned)
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{
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next = buffer[offset[id]];
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offset[id]++;
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*aligned = 0;
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return next >> 4;
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}
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else
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{
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*aligned = 1;
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return next & 0xf;
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}
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}
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static void
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gst_mpeg2subt_merge_title (GstMpeg2Subt *mpeg2subt, GstBuffer *buf)
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{
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gint x=0, y=0;
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gint width = mpeg2subt->width;
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gint height = mpeg2subt->height;
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guchar *buffer = GST_BUFFER_DATA(mpeg2subt->partialbuf);
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guchar *target = GST_BUFFER_DATA(buf);
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gint id=0, aligned=1;
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gint offset[2];
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offset[0] = mpeg2subt->offset[0];
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offset[1] = mpeg2subt->offset[1];
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#define get_nibble() get_nibble (buffer, offset, id, &aligned)
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GST_DEBUG (0,"mpeg2subt: merging subtitle");
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while ((offset[1] < mpeg2subt->data_size + 2) && (y < height))
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{
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gint code;
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gint length, colorid;
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code = get_nibble();
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if (code >= 0x4) /* 4 .. f */
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{
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found_code:
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length = code >> 2;
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colorid = code & 3;
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while (length--)
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if (x++ < width) {
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if (mpeg2subt->trans[colorid] != 0x0) {
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*target++ = mpeg2subt->color[colorid];
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}
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else target++;
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}
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if (x >= width)
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{
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if (!aligned)
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get_nibble ();
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goto next_line;
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}
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continue;
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}
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code = (code << 4) + get_nibble();
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if (code >= 0x10) /* 1x .. 3x */
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goto found_code;
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code = (code << 4) + get_nibble();
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if (code >= 0x40) /* 04x .. 0fx */
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goto found_code;
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code = (code << 4) + get_nibble();
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if (code >= 0x100) /* 01xx .. 03xx */
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goto found_code;
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/* 00xx - should only happen for 00 00 */
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if (!aligned)
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code = (code << 4) + get_nibble(); /* 0 0x xx */
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if (code)
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{
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g_print("mpeg2subt: got unknown code 00%x (offset %x side %x, x=%d, y=%d)\n", code, mpeg2subt->offset[id], id, x, y);
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goto next_line;
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}
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next_line:
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/* aligned 00 00 */
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if (y < height) {
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target+=(width-x);
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x = 0;
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y++;
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id = 1 - id;
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}
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}
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}
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static void
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gst_mpeg2subt_chain_subtitle (GstPad *pad, GstBuffer *buf)
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{
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GstMpeg2Subt *mpeg2subt;
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guchar *data;
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glong size = 0;
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g_return_if_fail(pad != NULL);
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g_return_if_fail(GST_IS_PAD(pad));
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g_return_if_fail(buf != NULL);
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/* g_return_if_fail(GST_IS_BUFFER(buf)); */
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mpeg2subt = GST_MPEG2SUBT (GST_OBJECT_PARENT (pad));
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if (mpeg2subt->have_title) {
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gst_buffer_unref(mpeg2subt->partialbuf);
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mpeg2subt->partialbuf = NULL;
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mpeg2subt->have_title = FALSE;
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}
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GST_DEBUG (0,"presentation time %llu", GST_BUFFER_TIMESTAMP(buf));
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/* deal with partial frame from previous buffer */
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if (mpeg2subt->partialbuf) {
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mpeg2subt->partialbuf = gst_buffer_merge(mpeg2subt->partialbuf, buf);;
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/* and the one we received.. */
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gst_buffer_unref(buf);
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}
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else {
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mpeg2subt->partialbuf = buf;
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}
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data = GST_BUFFER_DATA(mpeg2subt->partialbuf);
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size = GST_BUFFER_SIZE(mpeg2subt->partialbuf);
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mpeg2subt->packet_size = GUINT16_FROM_BE(*(guint16 *)data);
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if (mpeg2subt->packet_size == size) {
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GST_DEBUG (0,"mpeg2subt: subtitle packet size %d, current size %ld", mpeg2subt->packet_size, size);
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mpeg2subt->data_size = GUINT16_FROM_BE(*(guint16 *)(data+2));
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gst_mpeg2subt_parse_header(mpeg2subt);
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mpeg2subt->have_title = TRUE;
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}
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}
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static void
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gst_mpeg2subt_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
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{
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GstMpeg2Subt *src;
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/* it's not null if we got it, but it might not be ours */
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g_return_if_fail(GST_IS_MPEG2SUBT(object));
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src = GST_MPEG2SUBT(object);
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switch (prop_id) {
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default:
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break;
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}
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}
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static void
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gst_mpeg2subt_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
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{
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GstMpeg2Subt *src;
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/* it's not null if we got it, but it might not be ours */
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g_return_if_fail(GST_IS_MPEG2SUBT(object));
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src = GST_MPEG2SUBT(object);
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switch (prop_id) {
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default:
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break;
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}
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}
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static gboolean
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plugin_init (GModule *module, GstPlugin *plugin)
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{
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GstElementFactory *factory;
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/* create an elementfactory for the mpeg2subt element */
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factory = gst_element_factory_new("mpeg2subt",GST_TYPE_MPEG2SUBT,
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&mpeg2subt_details);
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g_return_val_if_fail(factory != NULL, FALSE);
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gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));
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return TRUE;
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}
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GstPluginDesc plugin_desc = {
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GST_VERSION_MAJOR,
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GST_VERSION_MINOR,
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"mpeg2subt",
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plugin_init
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};
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