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gstreamer/sys/dxr3/dxr3videosink.c
Tim-Philipp Müller 9e1b75fda3 Fix FSF address 
https://bugzilla.gnome.org/show_bug.cgi?id=687520
2012-11-04 00:09:59 +00:00

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/* GStreamer
* Copyright (C) 2003 Martin Soto <martinsoto@users.sourceforge.net>
*
* dxr3videosink.c: Video sink for em8300 based cards.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <errno.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <linux/em8300.h>
#include <gst/gst-i18n-plugin.h>
#include <gst/gst.h>
#include "dxr3videosink.h"
#include "dxr3marshal.h"
#include "dxr3common.h"
/* Dxr3VideoSink signals and args */
enum
{
SIGNAL_FLUSHED,
LAST_SIGNAL
};
enum
{
ARG_0,
};
/* Possible states for the MPEG start code scanner. */
enum
{
SCAN_STATE_WAITING, /* Waiting for a code. */
SCAN_STATE_0, /* 0 seen. */
SCAN_STATE_00, /* 00 seen. */
SCAN_STATE_001 /* 001 seen. */
};
/* Possible states for the MPEG sequence parser. */
enum
{
PARSE_STATE_WAITING, /* Waiting for the start of a sequence. */
PARSE_STATE_START, /* Start of sequence seen. */
PARSE_STATE_PICTURE /* Picture start seen. */
};
/* Relevant mpeg start codes. */
#define START_CODE_PICTURE 0x00
#define START_CODE_SEQUENCE_HEADER 0xB3
#define START_CODE_SEQUENCE_END 0xB7
static GstStaticPadTemplate dxr3videosink_sink_factory =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/mpeg, "
"mpegversion = (int) { 1, 2 }, " "systemstream = (boolean) FALSE"
/* width/height/framerate omitted, we don't
* need a parsed stream */
)
);
static void dxr3videosink_class_init (Dxr3VideoSinkClass * klass);
static void dxr3videosink_base_init (Dxr3VideoSinkClass * klass);
static void dxr3videosink_init (Dxr3VideoSink * dxr3videosink);
static void dxr3videosink_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec);
static void dxr3videosink_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec);
static gboolean dxr3videosink_open (Dxr3VideoSink * sink);
static void dxr3videosink_close (Dxr3VideoSink * sink);
static gboolean dxr3videosink_set_clock (GstElement * element,
GstClock * clock);
static void dxr3videosink_reset_parser (Dxr3VideoSink * sink);
static int dxr3videosink_next_start_code (Dxr3VideoSink * sink);
static void dxr3videosink_discard_data (Dxr3VideoSink * sink, guint cut);
static void dxr3videosink_write_data (Dxr3VideoSink * sink, guint cut);
static void dxr3videosink_parse_data (Dxr3VideoSink * sink);
static gboolean dxr3videosink_handle_event (GstPad * pad, GstEvent * event);
static void dxr3videosink_chain (GstPad * pad, GstData * _data);
static GstStateChangeReturn dxr3videosink_change_state (GstElement * element,
GstStateChange transition);
/* static void dxr3videosink_wait (Dxr3VideoSink *sink, */
/* GstClockTime time); */
static int dxr3videosink_mvcommand (Dxr3VideoSink * sink, int command);
static void dxr3videosink_flushed (Dxr3VideoSink * sink);
static GstElementClass *parent_class = NULL;
static guint dxr3videosink_signals[LAST_SIGNAL] = { 0 };
extern GType
dxr3videosink_get_type (void)
{
static GType dxr3videosink_type = 0;
if (!dxr3videosink_type) {
static const GTypeInfo dxr3videosink_info = {
sizeof (Dxr3VideoSinkClass),
(GBaseInitFunc) dxr3videosink_base_init,
NULL,
(GClassInitFunc) dxr3videosink_class_init,
NULL,
NULL,
sizeof (Dxr3VideoSink),
0,
(GInstanceInitFunc) dxr3videosink_init,
};
dxr3videosink_type = g_type_register_static (GST_TYPE_ELEMENT,
"Dxr3VideoSink", &dxr3videosink_info, 0);
}
return dxr3videosink_type;
}
static void
dxr3videosink_base_init (Dxr3VideoSinkClass * klass)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&dxr3videosink_sink_factory));
gst_element_class_set_static_metadata (element_class,
"dxr3/Hollywood+ mpeg decoder board video element", "Sink/Video",
"Feeds MPEG2 video to Sigma Designs em8300 based boards",
"Martin Soto <martinsoto@users.sourceforge.net>");
}
static void
dxr3videosink_class_init (Dxr3VideoSinkClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
parent_class = g_type_class_peek_parent (klass);
dxr3videosink_signals[SIGNAL_FLUSHED] =
g_signal_new ("flushed", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (Dxr3VideoSinkClass, flushed),
NULL, NULL, dxr3_marshal_VOID__VOID, G_TYPE_NONE, 0);
klass->flushed = dxr3videosink_flushed;
gobject_class->set_property = dxr3videosink_set_property;
gobject_class->get_property = dxr3videosink_get_property;
gstelement_class->change_state = dxr3videosink_change_state;
gstelement_class->set_clock = dxr3videosink_set_clock;
}
static void
dxr3videosink_init (Dxr3VideoSink * sink)
{
GstPad *pad;
pad = gst_pad_new_from_static_template (&dxr3videosink_sink_factory, "sink");
gst_element_add_pad (GST_ELEMENT (sink), pad);
gst_pad_set_chain_function (pad, dxr3videosink_chain);
GST_OBJECT_FLAG_SET (GST_ELEMENT (sink), GST_ELEMENT_EVENT_AWARE);
sink->card_number = 0;
sink->video_filename = NULL;
sink->video_fd = -1;
sink->control_filename = NULL;
sink->control_fd = -1;
sink->clock = NULL;
sink->last_ts = GST_CLOCK_TIME_NONE;
sink->cur_buf = NULL;
dxr3videosink_reset_parser (sink);
}
static void
dxr3videosink_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
Dxr3VideoSink *sink;
sink = DXR3VIDEOSINK (object);
switch (prop_id) {
default:
break;
}
}
static void
dxr3videosink_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
Dxr3VideoSink *sink;
g_return_if_fail (GST_IS_DXR3VIDEOSINK (object));
sink = DXR3VIDEOSINK (object);
switch (prop_id) {
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static gboolean
dxr3videosink_open (Dxr3VideoSink * sink)
{
g_return_val_if_fail (!GST_OBJECT_FLAG_IS_SET (sink, DXR3VIDEOSINK_OPEN),
FALSE);
/* Compute the name of the video device file. */
sink->video_filename = g_strdup_printf ("/dev/em8300_mv-%d",
sink->card_number);
sink->video_fd = open (sink->video_filename, O_WRONLY);
if (sink->video_fd < 0) {
GST_ELEMENT_ERROR (sink, RESOURCE, OPEN_WRITE,
(_("Could not open video device \"%s\" for writing."),
sink->video_filename), GST_ERROR_SYSTEM);
return FALSE;
}
/* Open the control device. */
sink->control_filename = g_strdup_printf ("/dev/em8300-%d",
sink->card_number);
sink->control_fd = open (sink->control_filename, O_WRONLY);
if (sink->control_fd < 0) {
GST_ELEMENT_ERROR (sink, RESOURCE, OPEN_WRITE,
(_("Could not open control device \"%s\" for writing."),
sink->control_filename), GST_ERROR_SYSTEM);
return FALSE;
}
GST_OBJECT_FLAG_SET (sink, DXR3VIDEOSINK_OPEN);
return TRUE;
}
static void
dxr3videosink_close (Dxr3VideoSink * sink)
{
g_return_if_fail (GST_OBJECT_FLAG_IS_SET (sink, DXR3VIDEOSINK_OPEN));
if (close (sink->video_fd) != 0) {
GST_ELEMENT_ERROR (sink, RESOURCE, CLOSE,
(_("Could not close video device \"%s\"."), sink->video_filename),
GST_ERROR_SYSTEM);
return;
}
if (close (sink->control_fd) != 0) {
GST_ELEMENT_ERROR (sink, RESOURCE, CLOSE,
(_("Could not close control device \"%s\"."), sink->control_filename),
GST_ERROR_SYSTEM);
return;
}
GST_OBJECT_FLAG_UNSET (sink, DXR3VIDEOSINK_OPEN);
free (sink->video_filename);
sink->video_filename = NULL;
}
static gboolean
dxr3videosink_set_clock (GstElement * element, GstClock * clock)
{
Dxr3VideoSink *src = DXR3VIDEOSINK (element);
src->clock = clock;
return GST_ELEMENT_CLASS (parent_class)->set_clock (element, clock);
}
static void
dxr3videosink_reset_parser (Dxr3VideoSink * sink)
{
if (sink->cur_buf != NULL) {
gst_buffer_unref (sink->cur_buf);
sink->cur_buf = NULL;
}
sink->cur_ts = GST_CLOCK_TIME_NONE;
sink->scan_state = SCAN_STATE_WAITING;
sink->scan_pos = 0;
sink->parse_state = PARSE_STATE_WAITING;
}
static int
dxr3videosink_next_start_code (Dxr3VideoSink * sink)
{
guchar c;
g_return_val_if_fail (sink->cur_buf != NULL, -1);
while (sink->scan_pos < GST_BUFFER_SIZE (sink->cur_buf)) {
c = (GST_BUFFER_DATA (sink->cur_buf))[sink->scan_pos];
switch (sink->scan_state) {
case SCAN_STATE_WAITING:
if (c == 0x00) {
sink->scan_state = SCAN_STATE_0;
}
break;
case SCAN_STATE_0:
if (c == 0x00) {
sink->scan_state = SCAN_STATE_00;
} else {
sink->scan_state = SCAN_STATE_WAITING;
}
break;
case SCAN_STATE_00:
if (c == 0x01) {
sink->scan_state = SCAN_STATE_001;
} else if (c != 0x00) {
sink->scan_state = SCAN_STATE_WAITING;
}
break;
case SCAN_STATE_001:
sink->scan_pos++;
sink->scan_state = SCAN_STATE_WAITING;
return c;
}
sink->scan_pos++;
}
return -1;
}
static void
dxr3videosink_discard_data (Dxr3VideoSink * sink, guint cut)
{
GstBuffer *sub;
guint size;
g_return_if_fail (sink->cur_buf != NULL);
g_assert (cut <= sink->scan_pos);
size = sink->scan_pos - cut;
g_return_if_fail (size <= GST_BUFFER_SIZE (sink->cur_buf));
if (GST_BUFFER_SIZE (sink->cur_buf) == size) {
gst_buffer_unref (sink->cur_buf);
sink->cur_buf = NULL;
} else {
sub = gst_buffer_create_sub (sink->cur_buf, size,
GST_BUFFER_SIZE (sink->cur_buf)
- size);
gst_buffer_unref (sink->cur_buf);
sink->cur_buf = sub;
}
sink->scan_state = SCAN_STATE_WAITING;
sink->scan_pos = cut;
sink->cur_ts = GST_CLOCK_TIME_NONE;
}
static void
dxr3videosink_write_data (Dxr3VideoSink * sink, guint cut)
{
guint size, written;
guint8 *data;
g_return_if_fail (sink->cur_buf != NULL);
if (GST_OBJECT_FLAG_IS_SET (sink, DXR3VIDEOSINK_OPEN)) {
if (sink->cur_ts != GST_CLOCK_TIME_NONE) {
guint pts;
/* fprintf (stderr, "------ Video Time %.04f\n", */
/* (double) sink->cur_ts / GST_SECOND); */
pts = (guint) GSTTIME_TO_MPEGTIME (sink->cur_ts);
ioctl (sink->video_fd, EM8300_IOCTL_VIDEO_SETPTS, &pts);
sink->cur_ts = GST_CLOCK_TIME_NONE;
}
data = GST_BUFFER_DATA (sink->cur_buf);
size = sink->scan_pos - cut;
g_assert (size <= GST_BUFFER_SIZE (sink->cur_buf));
/* We should always write data that corresponds to whole MPEG
video sintactical elements. They should always start with an
MPEG start code. */
g_assert (size >= 4 && data[0] == 0 && data[1] == 0 && data[2] == 1);
while (size > 0) {
written = write (sink->video_fd, data, size);
if (written < 0) {
GST_ELEMENT_ERROR (sink, RESOURCE, WRITE,
(_("Could not write to device \"%s\"."), sink->video_filename),
GST_ERROR_SYSTEM);
break;
}
size = size - written;
data = data + written;
};
}
dxr3videosink_discard_data (sink, cut);
}
static void
dxr3videosink_parse_data (Dxr3VideoSink * sink)
{
int code;
/* Timestamp handling assumes that timestamps are associated to
sequence starts. This seems to be the case, at least for
DVDs. */
code = dxr3videosink_next_start_code (sink);
while (code >= 0) {
switch (sink->parse_state) {
case PARSE_STATE_WAITING:
if (code == START_CODE_SEQUENCE_HEADER) {
dxr3videosink_discard_data (sink, 4);
sink->parse_state = PARSE_STATE_START;
sink->cur_ts = sink->last_ts;
}
break;
case PARSE_STATE_START:
switch (code) {
case START_CODE_SEQUENCE_HEADER:
dxr3videosink_discard_data (sink, 4);
sink->cur_ts = sink->last_ts;
break;
case START_CODE_SEQUENCE_END:
dxr3videosink_discard_data (sink, 0);
sink->parse_state = PARSE_STATE_WAITING;
break;
case START_CODE_PICTURE:
sink->parse_state = PARSE_STATE_PICTURE;
break;
}
break;
case PARSE_STATE_PICTURE:
switch (code) {
case START_CODE_SEQUENCE_HEADER:
dxr3videosink_write_data (sink, 4);
sink->parse_state = PARSE_STATE_START;
sink->cur_ts = sink->last_ts;
break;
case START_CODE_SEQUENCE_END:
dxr3videosink_write_data (sink, 0);
sink->parse_state = PARSE_STATE_WAITING;
break;
case START_CODE_PICTURE:
dxr3videosink_write_data (sink, 4);
break;
}
break;
}
code = dxr3videosink_next_start_code (sink);
}
if (sink->parse_state == PARSE_STATE_WAITING) {
dxr3videosink_discard_data (sink, 0);
}
}
static gboolean
dxr3videosink_handle_event (GstPad * pad, GstEvent * event)
{
GstEventType type;
Dxr3VideoSink *sink;
sink = DXR3VIDEOSINK (gst_pad_get_parent (pad));
type = event ? GST_EVENT_TYPE (event) : GST_EVENT_UNKNOWN;
switch (type) {
case GST_EVENT_EMPTY:
//fprintf (stderr, "++++++ Video empty event\n");
{
/* FIXME: Handle this with a discontinuity or something. */
/* Write an MPEG2 sequence end code, to ensure that the card
actually displays the last picture. Apparently some DVDs are
encoded without proper sequence end codes. */
static guint8 sec[4] = { 0x00, 0x00, 0x01, 0xb7 };
if (sink->cur_buf != NULL) {
dxr3videosink_write_data (sink, 0);
}
write (sink->video_fd, &sec, 4);
}
break;
case GST_EVENT_DISCONTINUOUS:
//fprintf (stderr, "++++++ Video discont event\n");
{
gint64 time;
gboolean has_time;
unsigned cur_scr, mpeg_scr, diff;
has_time = gst_event_discont_get_value (event, GST_FORMAT_TIME, &time);
if (has_time) {
/* fprintf (stderr, "^^^^^^ Discontinuous event has time %.4f\n", */
/* (double) time / GST_SECOND); */
/* If the SCR in the card is way off, fix it. */
ioctl (sink->control_fd, EM8300_IOCTL_SCR_GET, &cur_scr);
mpeg_scr = MPEGTIME_TO_DXRTIME (GSTTIME_TO_MPEGTIME (time));
diff = cur_scr > mpeg_scr ? cur_scr - mpeg_scr : mpeg_scr - cur_scr;
if (diff > 1800) {
unsigned zero = 0;
/* fprintf (stderr, "====== Adjusting SCR from video\n"); */
ioctl (sink->control_fd, EM8300_IOCTL_SCR_SET, &zero);
ioctl (sink->control_fd, EM8300_IOCTL_SCR_SET, &mpeg_scr);
}
} else {
/* fprintf (stderr, "^^^^^^ Discontinuous event has no time\n"); */
}
}
break;
case GST_EVENT_FLUSH:
dxr3videosink_reset_parser (sink);
break;
default:
gst_pad_event_default (pad, event);
break;
}
return TRUE;
}
static void
dxr3videosink_chain (GstPad * pad, GstData * _data)
{
GstBuffer *buf = GST_BUFFER (_data);
Dxr3VideoSink *sink;
g_return_if_fail (pad != NULL);
g_return_if_fail (GST_IS_PAD (pad));
g_return_if_fail (buf != NULL);
sink = DXR3VIDEOSINK (gst_pad_get_parent (pad));
if (GST_IS_EVENT (buf)) {
dxr3videosink_handle_event (pad, GST_EVENT (buf));
return;
}
/* fprintf (stderr, "^^^^^^ Video block\n"); */
if (sink->cur_buf == NULL) {
sink->cur_buf = buf;
} else {
sink->cur_buf = gst_buffer_append (sink->cur_buf, buf);
}
sink->last_ts = GST_BUFFER_TIMESTAMP (buf);
dxr3videosink_parse_data (sink);
}
static GstStateChangeReturn
dxr3videosink_change_state (GstElement * element, GstStateChange transition)
{
g_return_val_if_fail (GST_IS_DXR3VIDEOSINK (element),
GST_STATE_CHANGE_FAILURE);
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
if (!GST_OBJECT_FLAG_IS_SET (element, DXR3VIDEOSINK_OPEN)) {
if (!dxr3videosink_open (DXR3VIDEOSINK (element))) {
return GST_STATE_CHANGE_FAILURE;
}
}
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
dxr3videosink_mvcommand (DXR3VIDEOSINK (element), MVCOMMAND_PAUSE);
break;
case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
dxr3videosink_mvcommand (DXR3VIDEOSINK (element), MVCOMMAND_START);
break;
case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
dxr3videosink_mvcommand (DXR3VIDEOSINK (element), MVCOMMAND_PAUSE);
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
dxr3videosink_mvcommand (DXR3VIDEOSINK (element), MVCOMMAND_STOP);
break;
case GST_STATE_CHANGE_READY_TO_NULL:
if (GST_OBJECT_FLAG_IS_SET (element, DXR3VIDEOSINK_OPEN)) {
dxr3videosink_close (DXR3VIDEOSINK (element));
}
break;
}
if (GST_ELEMENT_CLASS (parent_class)->change_state) {
return GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
}
return GST_STATE_CHANGE_SUCCESS;
}
#if 0
/**
* dxr3videosink_wait:
*
* Make the sink wait the specified amount of time.
*/
static void
dxr3videosink_wait (Dxr3VideoSink * sink, GstClockTime time)
{
GstClockID id;
GstClockTimeDiff jitter;
GstClockReturn ret;
GstClockTime current_time = gst_clock_get_time (sink->clock);
id = gst_clock_new_single_shot_id (sink->clock, current_time + time);
ret = gst_clock_id_wait (id, &jitter);
gst_clock_id_free (id);
}
#endif
/**
* dxr3videosink_mvcommand
*
* Send an MVCOMMAND to the card.
*/
static int
dxr3videosink_mvcommand (Dxr3VideoSink * sink, int command)
{
em8300_register_t regs;
regs.microcode_register = 1;
regs.reg = 0;
regs.val = command;
return ioctl (sink->control_fd, EM8300_IOCTL_WRITEREG, &regs);
}
/**
* dxr3videosink_flushed:
*
* Default do nothing implementation for the "flushed" signal. The
* "flushed" signal will be fired right after flushing the hardware
* queues due to a received flush event
*/
static void
dxr3videosink_flushed (Dxr3VideoSink * sink)
{
/* Do nothing. */
}
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