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dvbsuboverlay: implement display definition segment parsing

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This commit is contained in:
Janne Grunau 2010-12-11 17:10:25 +01:00 committed by Sebastian Dröge
parent 2f6f78caa3
commit 83a84ba230
2 changed files with 85 additions and 0 deletions
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57
gst/dvbsuboverlay/dvb-sub.c
View file

@ -189,6 +189,7 @@ struct _DvbSubPrivate
int display_list_size;
DVBSubRegionDisplay *display_list;
GString *pes_buffer;
DVBSubtitleWindow display_def;
};
#define DVB_SUB_GET_PRIVATE(obj) (G_TYPE_INSTANCE_GET_PRIVATE ((obj), DVB_TYPE_SUB, DvbSubPrivate))
@ -329,6 +330,12 @@ dvb_sub_init (DvbSub * self)
priv->object_list = NULL;
priv->page_time_out = 0; /* FIXME: Maybe 255 instead? */
priv->pes_buffer = g_string_new (NULL);
/* display/window information */
priv->display_def.version = -1;
priv->display_def.window_flag = 0;
priv->display_def.display_width = 720;
priv->display_def.display_height = 576;
}
static void
@ -1248,6 +1255,46 @@ _dvb_sub_parse_object_segment (DvbSub * dvb_sub, guint16 page_id, guint8 * buf,
}
}
static gint
_dvb_sub_parse_display_definition_segment (DvbSub * dvb_sub, guint8 * buf,
gint buf_size)
{
int dds_version, info_byte;
DvbSubPrivate *ctx = dvb_sub->private_data;
if (buf_size < 5)
return -1;
info_byte = *buf++;
dds_version = info_byte >> 4;
if (ctx->display_def.version == dds_version)
return 0; /* already have this display definition version */
ctx->display_def.version = dds_version;
ctx->display_def.display_width = GST_READ_UINT16_BE (buf) + 1;
buf += 2;
ctx->display_def.display_height = GST_READ_UINT16_BE (buf) + 1;
buf += 2;
ctx->display_def.window_flag = info_byte & 1 << 3;
if (buf_size >= 13 && ctx->display_def.window_flag) {
ctx->display_def.window_x = GST_READ_UINT16_BE (buf);
buf += 2;
ctx->display_def.window_y = GST_READ_UINT16_BE (buf);
buf += 2;
ctx->display_def.window_width =
GST_READ_UINT16_BE (buf) - ctx->display_def.window_x + 1;
buf += 2;
ctx->display_def.window_height =
GST_READ_UINT16_BE (buf) - ctx->display_def.window_y + 1;
buf += 2;
}
return 0;
}
static gint
_dvb_sub_parse_end_of_display_set (DvbSub * dvb_sub, guint16 page_id,
guint8 * buf, gint buf_size, guint64 pts)
@ -1286,6 +1333,9 @@ _dvb_sub_parse_end_of_display_set (DvbSub * dvb_sub, guint16 page_id,
i = 0;
/* copy subtitle display and window information */
sub->display_def = priv->display_def;
for (display = priv->display_list; display; display = display->next) {
region = get_region (dvb_sub, display->region_id);
rect = sub->rects[i];
@ -1405,6 +1455,7 @@ dvb_sub_new (void)
#define DVB_SUB_SEGMENT_REGION_COMPOSITION 0x11
#define DVB_SUB_SEGMENT_CLUT_DEFINITION 0x12
#define DVB_SUB_SEGMENT_OBJECT_DATA 0x13
#define DVB_SUB_SEGMENT_DISPLAY_DEFINITION 0x14
#define DVB_SUB_SEGMENT_END_OF_DISPLAY_SET 0x80
#define DVB_SUB_SEGMENT_STUFFING 0xFF
@ -1503,6 +1554,12 @@ dvb_sub_feed_with_pts (DvbSub * dvb_sub, guint64 pts, guint8 * data, gint len)
"Object data segment at buffer pos %u\n", pos);
_dvb_sub_parse_object_segment (dvb_sub, page_id, data + pos, segment_len); /* FIXME: Not sure about args */
break;
case DVB_SUB_SEGMENT_DISPLAY_DEFINITION:
dvb_log (DVB_LOG_PACKET, G_LOG_LEVEL_DEBUG,
"display definition segment at buffer pos %u\n", pos);
_dvb_sub_parse_display_definition_segment (dvb_sub, data + pos,
segment_len);
break;
case DVB_SUB_SEGMENT_END_OF_DISPLAY_SET:
dvb_log (DVB_LOG_PACKET, G_LOG_LEVEL_DEBUG,
"End of display set at buffer pos %u\n", pos);

28
gst/dvbsuboverlay/dvb-sub.h
View file

@ -93,6 +93,33 @@ typedef struct DVBSubtitleRect {
DVBSubtitlePicture pict;
} DVBSubtitleRect;
/**
* DVBSubtitleWindow
* @version: version
* @display_window_flag: window_* are valid
* @display_width: assumed width of display
* @display_height: assumed height of display
* @window_x: x coordinate of top left corner of the subtitle window
* @window_y: y coordinate of top left corner of the subtitle window
* @window_width: width of the subtitle window
* @window_height: height of the subtitle window
*
* A structure presenting display and window information
* display definition segment from ETSI EN 300 743 V1.3.1
*/
typedef struct DVBSubtitleWindow {
gint version;
gint window_flag;
gint display_width;
gint display_height;
gint window_x;
gint window_y;
gint window_width;
gint window_height;
} DVBSubtitleWindow;
/**
* DVBSubtitles:
* @num_rects: the number of #DVBSubtitleRect in @rects
@ -105,6 +132,7 @@ typedef struct DVBSubtitles {
guint8 page_time_out;
unsigned int num_rects;
DVBSubtitleRect **rects;
DVBSubtitleWindow display_def;
} DVBSubtitles;
/**