gstreamer/ext/teletextdec/gstteletextdec.c

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/*
* GStreamer
* Copyright (C) 2009 Sebastian Pölsterl <sebp@k-d-w.org>
* Copyright (C) 2010 Andoni Morales Alastruey <ylatuya@gmail.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301 USA
*/
/**
* SECTION:element-teletextdec
*
* Decode PES stream containing teletext information to RGBA stream
*
* <refsect2>
* <title>Example launch line</title>
* |[
* gst-launch -v -m filesrc location=recording.mpeg ! mpegtsdemux ! private/teletext ! teletextdec ! ffmpegcolorspace ! ximagesink
* ]|
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst.h>
#include <gst/video/video.h>
#include <string.h>
#include "gstteletextdec.h"
GST_DEBUG_CATEGORY_STATIC (gst_teletextdec_debug);
#define GST_CAT_DEFAULT gst_teletextdec_debug
#define SUBTITLES_PAGE 888
#define MAX_SLICES 32
#define DEFAULT_FONT_DESCRIPTION "verdana 12"
#define PANGO_TEMPLATE "<span font_desc=\"%s\" foreground=\"%s\"> %s \n</span>"
/* Filter signals and args */
enum
{
LAST_SIGNAL
};
enum
{
PROP_0,
PROP_PAGENO,
PROP_SUBNO,
PROP_SUBTITLES_MODE,
PROP_SUBS_TEMPLATE,
PROP_FONT_DESCRIPTION
};
enum
{
VBI_ERROR = -1,
VBI_SUCCESS = 0,
VBI_NEW_FRAME = 1
};
typedef enum
{
DATA_UNIT_EBU_TELETEXT_NON_SUBTITLE = 0x02,
DATA_UNIT_EBU_TELETEXT_SUBTITLE = 0x03,
DATA_UNIT_EBU_TELETEXT_INVERTED = 0x0C,
DATA_UNIT_ZVBI_WSS_CPR1204 = 0xB4,
DATA_UNIT_ZVBI_CLOSED_CAPTION_525 = 0xB5,
DATA_UNIT_ZVBI_MONOCHROME_SAMPLES_525 = 0xB6,
DATA_UNIT_VPS = 0xC3,
DATA_UNIT_WSS = 0xC4,
DATA_UNIT_CLOSED_CAPTION = 0xC5,
DATA_UNIT_MONOCHROME_SAMPLES = 0xC6,
DATA_UNIT_STUFFING = 0xFF,
} data_unit_id;
typedef struct
{
int pgno;
int subno;
} page_info;
typedef enum
{
SYSTEM_525 = 0,
SYSTEM_625
} systems;
/*
* ETS 300 706 Table 30: Colour Map
*/
static const gchar *default_color_map[40] = {
"#000000", "#FF0000", "#00FF00", "#FFFF00", "#0000FF",
"#FF00FF", "#00FFFF", "#FFFFFF", "#000000", "#770000",
"#007700", "#777700", "#000077", "#770077", "#007777",
"#777777", "#FF0055", "#FF7700", "#00FF77", "#FFFFBB",
"#00CCAA", "#550000", "#665522", "#CC7777", "#333333",
"#FF7777", "#77FF77", "#FFFF77", "#7777FF", "#FF77FF",
"#77FFFF", "#DDD0DD",
/* Private colors */
"#000000", "#FFAA99", "#44EE00", "#FFDD00", "#FFAA99",
"#FF00FF", "#00FFFF", "#EEEEEE"
};
static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS
("video/mpeg,mpegversion=2,systemstream=TRUE ; private/teletext")
);
static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS
(GST_VIDEO_CAPS_RGBA "; text/plain ; text/html ; text/x-pango-markup")
);
/* debug category for filtering log messages */
#define DEBUG_INIT(bla) \
GST_DEBUG_CATEGORY_INIT (gst_teletextdec_debug, "teletext", 0, "Teletext decoder");
GST_BOILERPLATE_FULL (GstTeletextDec, gst_teletextdec, GstElement,
GST_TYPE_ELEMENT, DEBUG_INIT);
static void gst_teletextdec_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_teletextdec_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void gst_teletextdec_finalize (GObject * object);
static GstStateChangeReturn gst_teletextdec_change_state (GstElement * element,
GstStateChange transition);
static GstFlowReturn gst_teletextdec_chain (GstPad * pad, GstBuffer * buf);
static gboolean gst_teletextdec_sink_setcaps (GstPad * pad, GstCaps * caps);
static gboolean gst_teletextdec_sink_event (GstPad * pad, GstEvent * event);
static GstPadLinkReturn gst_teletextdec_src_set_caps (GstPad * pad,
GstCaps * caps);
static vbi_bool gst_teletextdec_convert (vbi_dvb_demux * dx, gpointer user_data,
const vbi_sliced * sliced, guint n_lines, gint64 pts);
static void gst_teletextdec_event_handler (vbi_event * ev, void *user_data);
static GstFlowReturn gst_teletextdec_push_page (GstTeletextDec * teletext);
static GstFlowReturn gst_teletextdec_export_text_page (GstTeletextDec *
teletext, vbi_page * page, GstBuffer ** buf);
static GstFlowReturn gst_teletextdec_export_html_page (GstTeletextDec *
teletext, vbi_page * page, GstBuffer ** buf);
static GstFlowReturn gst_teletextdec_export_rgba_page (GstTeletextDec *
teletext, vbi_page * page, GstBuffer ** buf);
static GstFlowReturn gst_teletextdec_export_pango_page (GstTeletextDec *
teletext, vbi_page * page, GstBuffer ** buf);
static gboolean gst_teletextdec_push_preroll_buffer (GstTeletextDec * teletext);
static void gst_teletextdec_process_telx_buffer (GstTeletextDec * teletext,
GstBuffer * buf);
static void gst_teletextdec_process_pes_buffer (GstTeletextDec * teletext,
GstBuffer * buf);
static gboolean gst_teletextdec_extract_data_units (GstTeletextDec * teletext,
GstTeletextFrame * f, guint8 * packet, guint * offset, gint size);
static void gst_teletextdec_zvbi_init (GstTeletextDec * teletext);
static void gst_teletextdec_zvbi_clear (GstTeletextDec * teletext);
/* GObject vmethod implementations */
static void
gst_teletextdec_base_init (gpointer klass)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
gst_element_class_set_details_simple (element_class,
"Teletext decoder",
"Decoder",
"Decode PES or raw VBI stream containing teletext information to RGBA, HTML and text",
"Sebastian Pölsterl <sebp@k-d-w.org>, "
"Andoni Morales Alastruey <ylatuya@gmail.com>");
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&src_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&sink_template));
}
/* initialize the gstteletext's class */
static void
gst_teletextdec_class_init (GstTeletextDecClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = G_OBJECT_CLASS (klass);
gobject_class->set_property = gst_teletextdec_set_property;
gobject_class->get_property = gst_teletextdec_get_property;
gobject_class->finalize = gst_teletextdec_finalize;
gstelement_class = GST_ELEMENT_CLASS (klass);
gstelement_class->change_state =
GST_DEBUG_FUNCPTR (gst_teletextdec_change_state);
g_object_class_install_property (gobject_class, PROP_PAGENO,
g_param_spec_int ("page", "Page number",
"Number of page that should displayed",
100, 999, 100, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_SUBNO,
g_param_spec_int ("subpage", "Sub-page number",
"Number of sub-page that should displayed (-1 for all)",
-1, 0x99, -1, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_SUBTITLES_MODE,
g_param_spec_boolean ("subtitles-mode", "Enable subtitles mode",
"Enables subtitles mode for text output stripping the blank lines and "
"the teletext state lines", FALSE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_SUBS_TEMPLATE,
g_param_spec_string ("subtitles-template", "Subtitles output template",
"Output template used to print each one of the subtitles lines",
g_strescape ("%s\n", NULL),
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_FONT_DESCRIPTION,
g_param_spec_string ("font-description", "Pango font description",
"Font description used for the pango output.",
DEFAULT_FONT_DESCRIPTION,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
}
/* initialize the new element
* initialize instance structure
*/
static void
gst_teletextdec_init (GstTeletextDec * teletext, GstTeletextDecClass * klass)
{
/* Create sink pad */
teletext->sinkpad = gst_pad_new_from_static_template (&sink_template, "sink");
gst_pad_set_setcaps_function (teletext->sinkpad,
GST_DEBUG_FUNCPTR (gst_teletextdec_sink_setcaps));
gst_pad_set_chain_function (teletext->sinkpad,
GST_DEBUG_FUNCPTR (gst_teletextdec_chain));
gst_pad_set_event_function (teletext->sinkpad,
GST_DEBUG_FUNCPTR (gst_teletextdec_sink_event));
gst_element_add_pad (GST_ELEMENT (teletext), teletext->sinkpad);
/* Create src pad */
teletext->srcpad = gst_pad_new_from_static_template (&src_template, "src");
gst_pad_set_setcaps_function (teletext->srcpad,
GST_DEBUG_FUNCPTR (gst_teletextdec_src_set_caps));
gst_element_add_pad (GST_ELEMENT (teletext), teletext->srcpad);
teletext->demux = NULL;
teletext->decoder = NULL;
teletext->pageno = 0x100;
teletext->subno = -1;
teletext->subtitles_mode = FALSE;
teletext->subtitles_template = g_strescape ("%s\n", NULL);
teletext->font_description = g_strdup (DEFAULT_FONT_DESCRIPTION);
teletext->in_timestamp = GST_CLOCK_TIME_NONE;
teletext->in_duration = GST_CLOCK_TIME_NONE;
teletext->rate_numerator = 0;
teletext->rate_denominator = 1;
teletext->queue = NULL;
teletext->queue_lock = g_mutex_new ();
teletext->frame = g_new0 (GstTeletextFrame, 1);
teletext->frame->sliced_begin = g_new (vbi_sliced, MAX_SLICES);
teletext->last_ts = 0;
teletext->process_buf_func = NULL;
}
static void
gst_teletextdec_finalize (GObject * object)
{
GstTeletextDec *teletext = GST_TELETEXTDEC (object);
g_mutex_free (teletext->queue_lock);
g_free (teletext->frame);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gst_teletextdec_zvbi_init (GstTeletextDec * teletext)
{
g_return_if_fail (teletext != NULL);
GST_LOG_OBJECT (teletext, "Initializing structures");
teletext->decoder = vbi_decoder_new ();
vbi_event_handler_register (teletext->decoder,
VBI_EVENT_TTX_PAGE | VBI_EVENT_CAPTION,
gst_teletextdec_event_handler, teletext);
g_mutex_lock (teletext->queue_lock);
teletext->queue = g_queue_new ();
g_mutex_unlock (teletext->queue_lock);
}
static void
gst_teletextdec_zvbi_clear (GstTeletextDec * teletext)
{
g_return_if_fail (teletext != NULL);
GST_LOG_OBJECT (teletext, "Clearing structures");
if (teletext->demux != NULL) {
vbi_dvb_demux_delete (teletext->demux);
teletext->demux = NULL;
}
if (teletext->decoder != NULL) {
vbi_decoder_delete (teletext->decoder);
teletext->decoder = NULL;
}
if (teletext->frame != NULL) {
g_free (teletext->frame);
teletext->frame = NULL;
}
g_mutex_lock (teletext->queue_lock);
if (teletext->queue != NULL) {
g_queue_free (teletext->queue);
teletext->queue = NULL;
}
g_mutex_unlock (teletext->queue_lock);
teletext->in_timestamp = GST_CLOCK_TIME_NONE;
teletext->in_duration = GST_CLOCK_TIME_NONE;
teletext->pageno = 0x100;
teletext->subno = -1;
teletext->last_ts = 0;
}
static void
gst_teletextdec_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstTeletextDec *teletext = GST_TELETEXTDEC (object);
switch (prop_id) {
case PROP_PAGENO:
teletext->pageno = (gint) vbi_bin2bcd (g_value_get_int (value));
break;
case PROP_SUBNO:
teletext->subno = g_value_get_int (value);
break;
case PROP_SUBTITLES_MODE:
teletext->subtitles_mode = g_value_get_boolean (value);
break;
case PROP_SUBS_TEMPLATE:
teletext->subtitles_template = g_value_dup_string (value);
break;
case PROP_FONT_DESCRIPTION:
teletext->font_description = g_value_dup_string (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_teletextdec_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstTeletextDec *teletext = GST_TELETEXTDEC (object);
switch (prop_id) {
case PROP_PAGENO:
g_value_set_int (value, (gint) vbi_bcd2dec (teletext->pageno));
break;
case PROP_SUBNO:
g_value_set_int (value, teletext->subno);
break;
case PROP_SUBTITLES_MODE:
g_value_set_boolean (value, teletext->subtitles_mode);
break;
case PROP_SUBS_TEMPLATE:
g_value_set_string (value, teletext->subtitles_template);
break;
case PROP_FONT_DESCRIPTION:
g_value_set_string (value, teletext->font_description);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static gboolean
gst_teletextdec_sink_event (GstPad * pad, GstEvent * event)
{
gboolean ret;
GstTeletextDec *teletext = GST_TELETEXTDEC (gst_pad_get_parent (pad));
GST_DEBUG_OBJECT (teletext, "got event %s",
gst_event_type_get_name (GST_EVENT_TYPE (event)));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_NEWSEGMENT:
/* maybe save and/or update the current segment (e.g. for output
* clipping) or convert the event into one in a different format
* (e.g. BYTES to TIME) or drop it and set a flag to send a newsegment
* event in a different format later */
ret = gst_pad_push_event (teletext->srcpad, event);
break;
case GST_EVENT_EOS:
/* end-of-stream, we should close down all stream leftovers here */
gst_teletextdec_zvbi_clear (teletext);
ret = gst_pad_push_event (teletext->srcpad, event);
break;
case GST_EVENT_FLUSH_STOP:
gst_teletextdec_zvbi_clear (teletext);
gst_teletextdec_zvbi_init (teletext);
ret = gst_pad_push_event (teletext->srcpad, event);
break;
default:
ret = gst_pad_event_default (pad, event);
break;
}
gst_object_unref (teletext);
return ret;
}
static GstStateChangeReturn
gst_teletextdec_change_state (GstElement * element, GstStateChange transition)
{
GstStateChangeReturn ret;
GstTeletextDec *teletext;
teletext = GST_TELETEXTDEC (element);
switch (transition) {
case GST_STATE_CHANGE_READY_TO_PAUSED:
gst_teletextdec_zvbi_init (teletext);
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
if (ret != GST_STATE_CHANGE_SUCCESS)
return ret;
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_READY:
gst_teletextdec_zvbi_clear (teletext);
break;
default:
break;
}
return ret;
}
static gboolean
gst_teletextdec_sink_setcaps (GstPad * pad, GstCaps * caps)
{
GstTeletextDec *teletext = GST_TELETEXTDEC (gst_pad_get_parent (pad));
GstStructure *structure = gst_caps_get_structure (caps, 0);
const gchar *mimetype = gst_structure_get_name (structure);
GST_DEBUG_OBJECT (teletext, "%s:%s, caps=%" GST_PTR_FORMAT,
GST_DEBUG_PAD_NAME (pad), caps);
if (g_strcmp0 (mimetype, "private/teletext") == 0) {
teletext->process_buf_func = gst_teletextdec_process_telx_buffer;
goto accept_caps;
} else if (g_strcmp0 (mimetype, "video/mpeg") == 0) {
gint version;
gboolean is_systemstream;
if (!gst_structure_get_int (structure, "mpegversion", &version) ||
!gst_structure_get_boolean (structure, "systemstream",
&is_systemstream))
goto refuse_caps;
if (version != 2 || !is_systemstream)
goto refuse_caps;
teletext->process_buf_func = gst_teletextdec_process_pes_buffer;
teletext->demux = vbi_dvb_pes_demux_new (gst_teletextdec_convert, teletext);
goto accept_caps;
} else
goto refuse_caps;
accept_caps:
{
gst_object_unref (teletext);
return gst_teletextdec_push_preroll_buffer (teletext);
}
refuse_caps:
{
GST_ERROR_OBJECT (teletext,
"pad %s refused renegotiation to %" GST_PTR_FORMAT,
GST_PAD_NAME (pad), caps);
gst_object_unref (teletext);
return FALSE;
}
}
static gboolean
gst_teletextdec_src_set_caps (GstPad * pad, GstCaps * caps)
{
GstTeletextDec *teletext;
GstStructure *structure = NULL;
const gchar *mimetype;
GstPad *peer;
teletext = GST_TELETEXTDEC (gst_pad_get_parent (pad));
GST_DEBUG_OBJECT (teletext, "Linking teletext source pad");
if (gst_caps_is_empty (caps)) {
GST_ERROR_OBJECT (teletext,
"pad %s refused renegotiation to %" GST_PTR_FORMAT,
GST_PAD_NAME (pad), caps);
goto refuse_caps;
}
peer = gst_pad_get_peer (pad);
if (peer) {
gst_pad_set_caps (peer, caps);
gst_object_unref (peer);
}
structure = gst_caps_get_structure (caps, 0);
mimetype = gst_structure_get_name (structure);
if (g_strcmp0 (mimetype, "video/x-raw-rgb") == 0) {
teletext->output_format = GST_TELETEXTDEC_OUTPUT_FORMAT_RGBA;
GST_DEBUG_OBJECT (teletext, "Selected RGBA output format");
} else if (g_strcmp0 (mimetype, "text/html") == 0) {
teletext->output_format = GST_TELETEXTDEC_OUTPUT_FORMAT_HTML;
GST_DEBUG_OBJECT (teletext, "Selected HTML output format");
} else if (g_strcmp0 (mimetype, "text/plain") == 0) {
teletext->output_format = GST_TELETEXTDEC_OUTPUT_FORMAT_TEXT;
GST_DEBUG_OBJECT (teletext, "Selected text output format");
} else if (g_strcmp0 (mimetype, "text/x-pango-markup") == 0) {
teletext->output_format = GST_TELETEXTDEC_OUTPUT_FORMAT_PANGO;
GST_DEBUG_OBJECT (teletext, "Selected pango markup output format");
} else
goto refuse_caps;
gst_object_unref (teletext);
return TRUE;
refuse_caps:
{
gst_object_unref (teletext);
return FALSE;
}
}
static void
gst_teletextdec_reset_frame (GstTeletextDec * teletext)
{
teletext->frame->current_slice = teletext->frame->sliced_begin;
teletext->frame->sliced_end = teletext->frame->sliced_begin + MAX_SLICES;
teletext->frame->last_field = 0;
teletext->frame->last_field_line = 0;
teletext->frame->last_frame_line = 0;
}
static void
gst_teletextdec_process_pes_buffer (GstTeletextDec * teletext, GstBuffer * buf)
{
vbi_dvb_demux_feed (teletext->demux, GST_BUFFER_DATA (buf),
GST_BUFFER_SIZE (buf));
return;
}
static void
gst_teletextdec_process_telx_buffer (GstTeletextDec * teletext, GstBuffer * buf)
{
guint8 *data = GST_BUFFER_DATA (buf);
const gint size = GST_BUFFER_SIZE (buf);
guint offset = 0;
gint res;
teletext->in_timestamp = GST_BUFFER_TIMESTAMP (buf);
teletext->in_duration = GST_BUFFER_DURATION (buf);
if (teletext->frame == NULL) {
gst_teletextdec_reset_frame (teletext);
}
while (offset < size) {
res =
gst_teletextdec_extract_data_units (teletext, teletext->frame, data,
&offset, size);
if (res == VBI_NEW_FRAME) {
/* We have a new frame, it's time to feed the decoder */
vbi_sliced *s;
gint n_lines;
n_lines = teletext->frame->current_slice - teletext->frame->sliced_begin;
GST_LOG_OBJECT (teletext, "Completed frame, decoding new %d lines",
n_lines);
s = g_memdup (teletext->frame->sliced_begin,
n_lines * sizeof (vbi_sliced));
vbi_decode (teletext->decoder, s, n_lines, teletext->last_ts);
/* From vbi_decode():
* timestamp shall advance by 1/30 to 1/25 seconds whenever calling this
* function. Failure to do so will be interpreted as frame dropping, which
* starts a resynchronization cycle, eventually a channel switch may be assumed
* which resets even more decoder state. So even if a frame did not contain
* any useful data this function must be called, with lines set to zero.
*/
teletext->last_ts += 0.04;
g_free (s);
gst_teletextdec_reset_frame (teletext);
} else if (res == VBI_ERROR) {
gst_teletextdec_reset_frame (teletext);
return;
}
}
return;
}
static vbi_bool
gst_teletextdec_convert (vbi_dvb_demux * dx,
gpointer user_data, const vbi_sliced * sliced, guint n_lines, gint64 pts)
{
gdouble sample_time;
vbi_sliced *s;
GstTeletextDec *teletext = GST_TELETEXTDEC (user_data);
GST_DEBUG_OBJECT (teletext, "Converting %u lines to decode", n_lines);
sample_time = pts * (1 / 90000.0);
s = g_memdup (sliced, n_lines * sizeof (vbi_sliced));
vbi_decode (teletext->decoder, s, n_lines, sample_time);
g_free (s);
return GST_FLOW_OK;
}
static void
gst_teletextdec_event_handler (vbi_event * ev, void *user_data)
{
page_info *pi;
vbi_pgno pgno;
vbi_subno subno;
GstTeletextDec *teletext = GST_TELETEXTDEC (user_data);
switch (ev->type) {
case VBI_EVENT_TTX_PAGE:
pgno = ev->ev.ttx_page.pgno;
subno = ev->ev.ttx_page.subno;
if (pgno != teletext->pageno
|| (teletext->subno != -1 && subno != teletext->subno))
return;
GST_DEBUG_OBJECT (teletext, "Received teletext page %03d.%02d",
(gint) vbi_bcd2dec (pgno), (gint) vbi_bcd2dec (subno));
pi = g_new (page_info, 1);
pi->pgno = pgno;
pi->subno = subno;
g_mutex_lock (teletext->queue_lock);
g_queue_push_tail (teletext->queue, pi);
g_mutex_unlock (teletext->queue_lock);
break;
case VBI_EVENT_CAPTION:
/* TODO: Handle subtitles in caption teletext pages */
GST_DEBUG_OBJECT (teletext, "Received caption page. Not implemented");
break;
default:
break;
}
return;
}
/* this function does the actual processing
*/
static GstFlowReturn
gst_teletextdec_chain (GstPad * pad, GstBuffer * buf)
{
GstTeletextDec *teletext = GST_TELETEXTDEC (GST_PAD_PARENT (pad));
GstFlowReturn ret = GST_FLOW_OK;
teletext->in_timestamp = GST_BUFFER_TIMESTAMP (buf);
teletext->in_duration = GST_BUFFER_DURATION (buf);
teletext->process_buf_func (teletext, buf);
gst_buffer_unref (buf);
g_mutex_lock (teletext->queue_lock);
if (!g_queue_is_empty (teletext->queue)) {
ret = gst_teletextdec_push_page (teletext);
if (ret != GST_FLOW_OK) {
g_mutex_unlock (teletext->queue_lock);
goto error;
}
}
g_mutex_unlock (teletext->queue_lock);
return ret;
/* ERRORS */
error:
{
if (ret != GST_FLOW_OK && ret != GST_FLOW_NOT_LINKED
&& ret != GST_FLOW_WRONG_STATE) {
GST_ELEMENT_ERROR (teletext, STREAM, FAILED,
("Internal data stream error."), ("stream stopped, reason %s",
gst_flow_get_name (ret)));
return GST_FLOW_ERROR;
}
return ret;
}
}
static GstFlowReturn
gst_teletextdec_push_page (GstTeletextDec * teletext)
{
GstFlowReturn ret = GST_FLOW_OK;
GstBuffer *buf;
vbi_page page;
page_info *pi;
gint pgno, subno;
gboolean success;
pi = (page_info *) g_queue_pop_head (teletext->queue);
pgno = vbi_bcd2dec (pi->pgno);
subno = vbi_bcd2dec (pi->subno);
GST_INFO_OBJECT (teletext, "Fetching teletext page %03d.%02d", pgno, subno);
success = vbi_fetch_vt_page (teletext->decoder, &page, pi->pgno, pi->subno,
VBI_WST_LEVEL_3p5, 25, FALSE);
if (G_UNLIKELY (!success))
goto fetch_page_failed;
switch (teletext->output_format) {
case GST_TELETEXTDEC_OUTPUT_FORMAT_TEXT:
ret = gst_teletextdec_export_text_page (teletext, &page, &buf);
break;
case GST_TELETEXTDEC_OUTPUT_FORMAT_HTML:
ret = gst_teletextdec_export_html_page (teletext, &page, &buf);
break;
case GST_TELETEXTDEC_OUTPUT_FORMAT_RGBA:
ret = gst_teletextdec_export_rgba_page (teletext, &page, &buf);
break;
case GST_TELETEXTDEC_OUTPUT_FORMAT_PANGO:
ret = gst_teletextdec_export_pango_page (teletext, &page, &buf);
break;
default:
g_assert_not_reached ();
break;
}
vbi_unref_page (&page);
g_free (pi);
if (ret != GST_FLOW_OK)
goto alloc_failed;
GST_BUFFER_TIMESTAMP (buf) = teletext->in_timestamp;
GST_BUFFER_DURATION (buf) = teletext->in_duration;
GST_INFO_OBJECT (teletext, "Pushing buffer of size %d",
GST_BUFFER_SIZE (buf));
ret = gst_pad_push (teletext->srcpad, buf);
if (ret != GST_FLOW_OK)
goto push_failed;
return GST_FLOW_OK;
fetch_page_failed:
{
GST_ELEMENT_ERROR (teletext, RESOURCE, READ, (NULL), (NULL));
return GST_FLOW_ERROR;
}
alloc_failed:
{
GST_ERROR_OBJECT (teletext, "Error allocating output buffer, reason %s",
gst_flow_get_name (ret));
return ret;
}
push_failed:
{
GST_ERROR_OBJECT (teletext, "Pushing buffer failed, reason %s",
gst_flow_get_name (ret));
return ret;
}
}
static gchar **
gst_teletextdec_vbi_page_to_text_lines (GstTeletextDec * teletext,
guint start, guint stop, vbi_page * page)
{
const guint lines_count = stop - start + 1;
const guint line_length = page->columns;
gchar **lines;
gint i;
/* allocate a new NULL-terminated array of strings */
lines = (gchar **) g_malloc (sizeof (gchar *) * (lines_count + 1));
lines[lines_count] = g_strdup ('\0');
/* export each line in the range of the teletext page in text format */
for (i = start; i <= stop; i++) {
lines[i - start] = (gchar *) g_malloc (sizeof (gchar) * (line_length + 1));
vbi_print_page_region (page, lines[i - start], line_length + 1, "UTF-8",
TRUE, 0, 0, i, line_length, 1);
/* Add the null character */
lines[i - start][line_length] = '\0';
}
return lines;
}
static GstFlowReturn
gst_teletextdec_export_text_page (GstTeletextDec * teletext, vbi_page * page,
GstBuffer ** buf)
{
GstCaps *caps;
GstFlowReturn ret;
gchar *text;
guint size;
if (teletext->subtitles_mode) {
gchar **lines;
GString *subs;
guint i;
lines = gst_teletextdec_vbi_page_to_text_lines (teletext, 1, 23, page);
subs = g_string_new ("");
/* Strip white spaces and squash blank lines */
for (i = 0; i < 23; i++) {
g_strstrip (lines[i]);
if (g_strcmp0 (lines[i], ""))
g_string_append_printf (subs, teletext->subtitles_template, lines[i]);
}
/* if the page is blank and doesn't contain any line of text, just add a
* line break */
if (!g_strcmp0 (subs->str, ""))
g_string_append (subs, "\n");
text = subs->str;
size = subs->len + 1;
g_string_free (subs, FALSE);
g_strfreev (lines);
} else {
size = page->columns * page->rows;
text = g_malloc (size);
vbi_print_page (page, text, size, "UTF-8", FALSE, TRUE);
}
/* Allocate new buffer */
caps = gst_caps_new_simple ("text/plain", NULL);
ret = gst_pad_alloc_buffer (teletext->srcpad, GST_BUFFER_OFFSET_NONE,
size, caps, &(*buf));
if (G_LIKELY (ret == GST_FLOW_OK))
GST_BUFFER_DATA (*buf) = GST_BUFFER_MALLOCDATA (*buf) = (guint8 *) text;
else
gst_buffer_unref (*buf);
gst_caps_unref (caps);
return ret;
}
static GstFlowReturn
gst_teletextdec_export_html_page (GstTeletextDec * teletext, vbi_page * page,
GstBuffer ** buf)
{
GstCaps *caps;
GstFlowReturn ret;
gchar *html;
guint size;
vbi_export *ex;
gchar *err;
if (!(ex = vbi_export_new ("html", &err))) {
GST_ELEMENT_ERROR (teletext, LIBRARY, SETTINGS,
("Can't open the HTML export module: %s", err), (NULL));
g_free (err);
return GST_FLOW_ERROR;
}
/* export to NULL to get size of the memory needed to allocate the page */
size = vbi_export_mem (ex, NULL, 0, page);
if (size < 0)
return GST_FLOW_ERROR;
html = g_malloc (size);
vbi_export_mem (ex, html, size, page);
/* Allocate new buffer */
caps = gst_caps_new_simple ("text/html", NULL);
ret = gst_pad_alloc_buffer (teletext->srcpad, GST_BUFFER_OFFSET_NONE,
size, caps, &(*buf));
if (G_LIKELY (ret == GST_FLOW_OK))
GST_BUFFER_DATA (*buf) = GST_BUFFER_MALLOCDATA (*buf) = (guint8 *) html;
gst_caps_unref (caps);
return ret;
}
static GstFlowReturn
gst_teletextdec_export_rgba_page (GstTeletextDec * teletext, vbi_page * page,
GstBuffer ** buf)
{
guint size;
GstCaps *caps, *out_caps;
GstFlowReturn ret;
gint width, height;
GstPadTemplate *templ;
/* one character occupies 12 x 10 pixels */
width = page->columns * 12;
height = page->rows * 10;
caps = gst_caps_new_simple ("video/x-raw-rgb",
"width", G_TYPE_INT, width,
"height", G_TYPE_INT, height,
"framerate", GST_TYPE_FRACTION, teletext->rate_numerator,
teletext->rate_denominator, NULL);
templ = gst_static_pad_template_get (&src_template);
out_caps = gst_caps_intersect (caps, gst_pad_template_get_caps (templ));
gst_caps_unref (caps);
gst_object_unref (templ);
size = (guint) width *(guint) height *sizeof (vbi_rgba);
ret = gst_pad_alloc_buffer_and_set_caps (teletext->srcpad,
GST_BUFFER_OFFSET_NONE, size, out_caps, &(*buf));
if (ret == GST_FLOW_OK) {
GST_DEBUG_OBJECT (teletext, "Creating image with %d rows and %d cols",
page->rows, page->columns);
vbi_draw_vt_page (page, VBI_PIXFMT_RGBA32_LE,
(vbi_rgba *) GST_BUFFER_DATA (*buf), FALSE, TRUE);
}
gst_caps_unref (out_caps);
return ret;
}
static GstFlowReturn
gst_teletextdec_export_pango_page (GstTeletextDec * teletext, vbi_page * page,
GstBuffer ** buf)
{
vbi_char *acp;
const guint rows = page->rows;
gchar **colors;
gchar **lines;
GString *subs;
GstCaps *caps;
GstFlowReturn ret;
guint start, stop;
guint i, j;
colors = (gchar **) g_malloc (sizeof (gchar *) * (rows + 1));
colors[rows] = g_strdup ('\0');
/* parse all the lines and approximate it's foreground color using the first
* non null character */
for (acp = page->text, i = 0; i < page->rows; acp += page->columns, i++) {
for (j = 0; j < page->columns; j++) {
colors[i] = g_strdup (default_color_map[7]);
if (acp[j].unicode != 0x20) {
colors[i] = g_strdup (default_color_map[acp[j].foreground]);
break;
}
}
}
/* get an array of strings with each line of the telext page */
start = teletext->subtitles_mode ? 1 : 0;
stop = teletext->subtitles_mode ? rows - 2 : rows - 1;
lines = gst_teletextdec_vbi_page_to_text_lines (teletext, start, stop, page);
/* format each line in pango markup */
subs = g_string_new ("");
for (i = start; i <= stop; i++) {
g_string_append_printf (subs, PANGO_TEMPLATE,
teletext->font_description, colors[i], lines[i - start]);
}
/* Allocate new buffer */
caps = gst_caps_new_simple ("text/x-pango-markup", NULL);
ret = gst_pad_alloc_buffer (teletext->srcpad, GST_BUFFER_OFFSET_NONE,
subs->len + 1, caps, &(*buf));
if (G_LIKELY (ret == GST_FLOW_OK))
GST_BUFFER_DATA (*buf) = GST_BUFFER_MALLOCDATA (*buf) =
(guint8 *) subs->str;
else
gst_buffer_unref (*buf);
g_strfreev (lines);
g_strfreev (colors);
g_string_free (subs, FALSE);
gst_caps_unref (caps);
return ret;
}
static gboolean
gst_teletextdec_push_preroll_buffer (GstTeletextDec * teletext)
{
GstFlowReturn ret;
GstBuffer *buf;
gboolean res = TRUE;
GstStructure *structure;
const gchar *mimetype;
GstCaps *out_caps, *peer_caps, *pad_caps;
/* the stream is sparse, we send a dummy buffer for preroll */
peer_caps = gst_pad_peer_get_caps (teletext->srcpad);
pad_caps = gst_pad_get_caps (teletext->srcpad);
out_caps = gst_caps_intersect (pad_caps, peer_caps);
if (gst_caps_is_empty (out_caps)) {
res = FALSE;
goto beach;
}
gst_caps_truncate (out_caps);
structure = gst_caps_get_structure (out_caps, 0);
mimetype = gst_structure_get_name (structure);
if (g_strcmp0 (mimetype, "video/x-raw-rgb") == 0) {
/* omit preroll buffer for this format */
goto beach;
}
buf = gst_buffer_new_and_alloc (1);
2011-05-23 13:14:04 +00:00
GST_BUFFER_DATA (buf)[0] = 0;
gst_buffer_set_caps (buf, out_caps);
ret = gst_pad_push (teletext->srcpad, buf);
if (ret != GST_FLOW_OK)
res = FALSE;
beach:
{
gst_caps_unref (out_caps);
gst_caps_unref (pad_caps);
gst_caps_unref (peer_caps);
return res;
}
}
/* Converts the line_offset / field_parity byte of a VBI data unit. */
static void
gst_teletextdec_lofp_to_line (guint * field, guint * field_line,
guint * frame_line, guint lofp, systems system)
{
guint line_offset;
/* field_parity */
*field = !(lofp & (1 << 5));
line_offset = lofp & 31;
if (line_offset > 0) {
static const guint field_start[2][2] = {
{0, 263},
{0, 313},
};
*field_line = line_offset;
*frame_line = field_start[system][*field] + line_offset;
} else {
*field_line = 0;
*frame_line = 0;
}
}
static int
gst_teletextdec_line_address (GstTeletextDec * teletext,
GstTeletextFrame * frame, vbi_sliced ** spp, guint lofp, systems system)
{
guint field;
guint field_line;
guint frame_line;
if (G_UNLIKELY (frame->current_slice >= frame->sliced_end)) {
GST_LOG_OBJECT (teletext, "Out of sliced VBI buffer space (%d lines).",
(int) (frame->sliced_end - frame->sliced_begin));
return VBI_ERROR;
}
gst_teletextdec_lofp_to_line (&field, &field_line, &frame_line, lofp, system);
GST_LOG_OBJECT (teletext, "Line %u/%u=%u.", field, field_line, frame_line);
if (frame_line != 0) {
GST_LOG_OBJECT (teletext, "Last frame Line %u.", frame->last_frame_line);
if (frame_line <= frame->last_frame_line) {
GST_LOG_OBJECT (teletext, "New frame");
return VBI_NEW_FRAME;
}
/* new segment flag */
if (lofp < 0) {
GST_LOG_OBJECT (teletext, "New frame");
return VBI_NEW_FRAME;
}
frame->last_field = field;
frame->last_field_line = field_line;
frame->last_frame_line = frame_line;
*spp = frame->current_slice++;
(*spp)->line = frame_line;
} else {
/* Undefined line. */
return VBI_ERROR;
}
return VBI_SUCCESS;
}
static gboolean
gst_teletextdec_extract_data_units (GstTeletextDec * teletext,
GstTeletextFrame * f, guint8 * packet, guint * offset, gint size)
{
guint8 *data_unit;
guint i;
while (*offset < size) {
vbi_sliced *s = NULL;
gint data_unit_id, data_unit_length;
data_unit = packet + *offset;
data_unit_id = data_unit[0];
data_unit_length = data_unit[1];
GST_LOG_OBJECT (teletext, "vbi header %02x %02x %02x\n", data_unit[0],
data_unit[1], data_unit[2]);
switch (data_unit_id) {
case DATA_UNIT_STUFFING:
{
*offset += 2 + data_unit_length;
break;
}
case DATA_UNIT_EBU_TELETEXT_NON_SUBTITLE:
case DATA_UNIT_EBU_TELETEXT_SUBTITLE:
{
gint res;
if (G_UNLIKELY (data_unit_length != 1 + 1 + 42)) {
/* Skip this data unit */
GST_WARNING_OBJECT (teletext, "The data unit length is not 44 bytes");
*offset += 2 + data_unit_length;
break;
}
res =
gst_teletextdec_line_address (teletext, f, &s, data_unit[2],
SYSTEM_625);
if (G_UNLIKELY (res == VBI_ERROR)) {
/* Can't retrieve line address, skip this data unit */
GST_WARNING_OBJECT (teletext,
"Could not retrieve line address for this data unit");
return VBI_ERROR;
}
if (G_UNLIKELY (f->last_field_line > 0
&& (f->last_field_line - 7 >= 23 - 7))) {
GST_WARNING_OBJECT (teletext, "Bad line: %d", f->last_field_line - 7);
return VBI_ERROR;
}
if (res == VBI_NEW_FRAME) {
/* New frame */
return VBI_NEW_FRAME;
}
s->id = VBI_SLICED_TELETEXT_B;
for (i = 0; i < 42; i++)
s->data[i] = vbi_rev8 (data_unit[4 + i]);
*offset += 46;
break;
}
case DATA_UNIT_ZVBI_WSS_CPR1204:
case DATA_UNIT_ZVBI_CLOSED_CAPTION_525:
case DATA_UNIT_ZVBI_MONOCHROME_SAMPLES_525:
case DATA_UNIT_VPS:
case DATA_UNIT_WSS:
case DATA_UNIT_CLOSED_CAPTION:
case DATA_UNIT_MONOCHROME_SAMPLES:
{
/*Not supported yet */
*offset += 2 + data_unit_length;
break;
}
default:
{
/* corrupted stream, increase the offset by one until we sync */
GST_LOG_OBJECT (teletext, "Corrupted, increasing offset by one");
*offset += 1;
break;
}
}
}
return VBI_SUCCESS;
}