gstreamer/gst/mpegstream/gstmpegparse.c

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/* Gnome-Streamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
*
* 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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/*#define GST_DEBUG_ENABLED*/
#include "gstmpegparse.h"
/* elementfactory information */
static GstElementDetails mpeg_parse_details = {
"MPEG System Parser",
"Filter/Parser/System",
"Demultiplexes MPEG1 and MPEG2 System Streams",
VERSION,
"Erik Walthinsen <omega@cse.ogi.edu>\n"
"Wim Taymans <wim.taymans@chello.be>",
"(C) 1999",
};
#define CLASS(o) GST_MPEG_PARSE_CLASS (G_OBJECT_GET_CLASS (o))
/* GstMPEGParse signals and args */
enum {
/* FILL ME */
LAST_SIGNAL
};
enum {
ARG_0,
ARG_BIT_RATE,
ARG_MPEG2,
/* FILL ME */
};
GST_PADTEMPLATE_FACTORY (sink_factory,
"sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_CAPS_NEW (
"mpeg_parse_sink",
"video/mpeg",
"mpegversion", GST_PROPS_INT_RANGE (1, 2),
"systemstream", GST_PROPS_BOOLEAN (TRUE)
)
);
GST_PADTEMPLATE_FACTORY (src_factory,
"src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_CAPS_NEW (
"mpeg_parse_src",
"video/mpeg",
"mpegversion", GST_PROPS_INT_RANGE (1, 2),
"systemstream", GST_PROPS_BOOLEAN (TRUE),
"parsed", GST_PROPS_BOOLEAN (TRUE)
)
);
static void gst_mpeg_parse_class_init (GstMPEGParseClass *klass);
static void gst_mpeg_parse_init (GstMPEGParse *mpeg_parse);
static GstElementStateReturn
gst_mpeg_parse_change_state (GstElement *element);
static gboolean gst_mpeg_parse_parse_packhead (GstMPEGParse *mpeg_parse, GstBuffer *buffer);
static void gst_mpeg_parse_send_data (GstMPEGParse *mpeg_parse, GstData *data);
static void gst_mpeg_parse_loop (GstElement *element);
static void gst_mpeg_parse_get_property (GObject *object, guint prop_id,
GValue *value, GParamSpec *pspec);
static GstElementClass *parent_class = NULL;
/*static guint gst_mpeg_parse_signals[LAST_SIGNAL] = { 0 };*/
GType
gst_mpeg_parse_get_type (void)
{
static GType mpeg_parse_type = 0;
if (!mpeg_parse_type) {
static const GTypeInfo mpeg_parse_info = {
sizeof(GstMPEGParseClass), NULL,
NULL,
(GClassInitFunc)gst_mpeg_parse_class_init,
NULL,
NULL,
sizeof(GstMPEGParse),
0,
(GInstanceInitFunc)gst_mpeg_parse_init,
};
mpeg_parse_type = g_type_register_static(GST_TYPE_ELEMENT, "GstMPEGParse", &mpeg_parse_info, 0);
}
return mpeg_parse_type;
}
static void
gst_mpeg_parse_class_init (GstMPEGParseClass *klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass*)klass;
gstelement_class = (GstElementClass*)klass;
parent_class = g_type_class_ref(GST_TYPE_ELEMENT);
g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_BIT_RATE,
g_param_spec_uint("bit_rate","bit_rate","bit_rate",
0, G_MAXUINT, 0, G_PARAM_READABLE));
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_MPEG2,
g_param_spec_boolean ("mpeg2", "mpeg2", "is this an mpeg2 stream",
FALSE, G_PARAM_READABLE));
gobject_class->get_property = gst_mpeg_parse_get_property;
gstelement_class->change_state = gst_mpeg_parse_change_state;
klass->parse_packhead = gst_mpeg_parse_parse_packhead;
klass->parse_syshead = NULL;
klass->parse_packet = NULL;
klass->parse_pes = NULL;
klass->send_data = gst_mpeg_parse_send_data;
}
static void
gst_mpeg_parse_init (GstMPEGParse *mpeg_parse)
{
mpeg_parse->sinkpad = gst_pad_new_from_template(
GST_PADTEMPLATE_GET (sink_factory), "sink");
gst_element_add_pad(GST_ELEMENT(mpeg_parse),mpeg_parse->sinkpad);
gst_element_set_loop_function (GST_ELEMENT (mpeg_parse), gst_mpeg_parse_loop);
mpeg_parse->srcpad = gst_pad_new_from_template(
GST_PADTEMPLATE_GET (src_factory), "src");
gst_element_add_pad(GST_ELEMENT(mpeg_parse),mpeg_parse->srcpad);
/* initialize parser state */
mpeg_parse->packetize = NULL;
mpeg_parse->next_ts = 0;
/* zero counters (should be done at RUNNING?) */
mpeg_parse->bit_rate = 0;
GST_FLAG_SET (mpeg_parse, GST_ELEMENT_EVENT_AWARE);
}
static void
gst_mpeg_parse_send_data (GstMPEGParse *mpeg_parse, GstData *data)
{
if (GST_IS_EVENT (data)) {
gst_pad_event_default (mpeg_parse->sinkpad, GST_EVENT (data));
}
else {
guint64 size = GST_BUFFER_SIZE (data);
if (!GST_PAD_CAPS (mpeg_parse->srcpad)) {
gboolean mpeg2 = GST_MPEG_PACKETIZE_IS_MPEG2 (mpeg_parse->packetize);
gst_pad_try_set_caps (mpeg_parse->srcpad,
GST_CAPS_NEW (
"mpeg_parse_src",
"video/mpeg",
"mpegversion", GST_PROPS_INT (mpeg2 ? 2 : 1),
"systemstream", GST_PROPS_BOOLEAN (TRUE),
"parsed", GST_PROPS_BOOLEAN (TRUE)
));
}
GST_BUFFER_TIMESTAMP (data) = mpeg_parse->next_ts;
gst_pad_push (mpeg_parse->srcpad, GST_BUFFER (data));
mpeg_parse->next_ts += ((size * 1000000.0) / (mpeg_parse->bit_rate));
GST_DEBUG (0, "mpeg_parse: next_ts %lld\n", mpeg_parse->next_ts);
}
}
static gboolean
gst_mpeg_parse_parse_packhead (GstMPEGParse *mpeg_parse, GstBuffer *buffer)
{
guint8 *buf;
guint64 scr;
guint32 scr1, scr2;
guint32 new_rate;
GST_DEBUG (0, "mpeg_parse: in parse_packhead\n");
buf = GST_BUFFER_DATA (buffer);
buf += 4;
scr1 = GUINT32_FROM_BE (*(guint32*) buf);
scr2 = GUINT32_FROM_BE (*(guint32*) (buf+4));
if (GST_MPEG_PACKETIZE_IS_MPEG2 (mpeg_parse->packetize)) {
/* :2=01 ! scr:3 ! marker:1==1 ! scr:15 ! marker:1==1 ! scr:15 */
scr = (scr1 & 0x38000000) << 3;
scr |= (scr1 & 0x03fff800) << 4;
scr |= (scr1 & 0x000003ff) << 5;
scr |= (scr2 & 0xf8000000) >> 27;
buf += 6;
new_rate = (GUINT32_FROM_BE ((*(guint32 *) buf)) & 0xfffffc00) >> 10;
new_rate *= 133; /* FIXME trial and error */
}
else {
scr = (scr1 & 0x0e000000) << 5;
scr |= (scr1 & 0x00fffe00) << 6;
scr |= (scr1 & 0x000000ff) << 7;
scr |= (scr2 & 0xfe000000) >> 25;
buf += 5;
new_rate = (GUINT32_FROM_BE ((*(guint32 *) buf)) & 0x7ffffe00) >> 9;
new_rate *= 400;
}
GST_DEBUG (0, "mpeg_parse: SCR is %llu\n", scr);
mpeg_parse->next_ts = (scr*100)/9;
if (mpeg_parse->bit_rate != new_rate) {
mpeg_parse->bit_rate = new_rate;
gst_element_send_event (GST_ELEMENT (mpeg_parse),
gst_event_new_info ("bitrate", GST_PROPS_INT (new_rate), NULL));
}
GST_DEBUG (0, "mpeg_parse: stream is %1.3fMbs\n",
(mpeg_parse->bit_rate) / 1000000.0);
return TRUE;
}
static void
gst_mpeg_parse_loop (GstElement *element)
{
GstMPEGParse *mpeg_parse = GST_MPEG_PARSE (element);
GstData *data;
guint id;
gboolean mpeg2;
data = gst_mpeg_packetize_read (mpeg_parse->packetize);
id = GST_MPEG_PACKETIZE_ID (mpeg_parse->packetize);
mpeg2 = GST_MPEG_PACKETIZE_IS_MPEG2 (mpeg_parse->packetize);
if (GST_IS_BUFFER (data)) {
GstBuffer *buffer = GST_BUFFER (data);
GST_DEBUG (0, "mpeg2demux: have chunk 0x%02X\n", id);
switch (id) {
case 0xba:
if (CLASS (mpeg_parse)->parse_packhead) {
CLASS (mpeg_parse)->parse_packhead (mpeg_parse, buffer);
}
break;
case 0xbb:
if (CLASS (mpeg_parse)->parse_syshead) {
CLASS (mpeg_parse)->parse_syshead (mpeg_parse, buffer);
}
break;
default:
if (mpeg2 && ((id < 0xBD) || (id > 0xFE))) {
g_warning ("mpeg2demux: ******** unknown id 0x%02X", id);
}
else {
if (mpeg2) {
if (CLASS (mpeg_parse)->parse_pes) {
CLASS (mpeg_parse)->parse_pes (mpeg_parse, buffer);
}
}
else {
if (CLASS (mpeg_parse)->parse_packet) {
CLASS (mpeg_parse)->parse_packet (mpeg_parse, buffer);
}
}
}
}
}
if (CLASS (mpeg_parse)->send_data)
CLASS (mpeg_parse)->send_data (mpeg_parse, data);
}
static GstElementStateReturn
gst_mpeg_parse_change_state (GstElement *element)
{
GstMPEGParse *mpeg_parse = GST_MPEG_PARSE (element);
switch (GST_STATE_TRANSITION (element)) {
case GST_STATE_NULL_TO_READY:
if (!mpeg_parse->packetize) {
mpeg_parse->packetize = gst_mpeg_packetize_new (mpeg_parse->sinkpad, GST_MPEG_PACKETIZE_SYSTEM);
}
break;
case GST_STATE_READY_TO_NULL:
if (mpeg_parse->packetize) {
gst_mpeg_packetize_destroy (mpeg_parse->packetize);
mpeg_parse->packetize = NULL;
}
break;
default:
break;
}
GST_ELEMENT_CLASS (parent_class)->change_state (element);
return GST_STATE_SUCCESS;
}
static void
gst_mpeg_parse_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
{
GstMPEGParse *mpeg_parse;
/* it's not null if we got it, but it might not be ours */
mpeg_parse = GST_MPEG_PARSE(object);
switch (prop_id) {
case ARG_BIT_RATE:
g_value_set_uint (value, mpeg_parse->bit_rate);
break;
case ARG_MPEG2:
if (mpeg_parse->packetize)
g_value_set_boolean (value, GST_MPEG_PACKETIZE_IS_MPEG2 (mpeg_parse->packetize));
else
g_value_set_boolean (value, FALSE);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
gboolean
gst_mpeg_parse_plugin_init (GModule *module, GstPlugin *plugin)
{
GstElementFactory *factory;
/* this filter needs the bytestream package */
if (!gst_library_load("gstbytestream")) {
gst_info("mpeg_parse:: could not load support library: 'gstbytestream'\n");
return FALSE;
}
/* create an elementfactory for the mpeg_parse element */
factory = gst_elementfactory_new("mpegparse",GST_TYPE_MPEG_PARSE,
&mpeg_parse_details);
g_return_val_if_fail(factory != NULL, FALSE);
gst_elementfactory_add_padtemplate (factory, GST_PADTEMPLATE_GET (src_factory));
gst_elementfactory_add_padtemplate (factory, GST_PADTEMPLATE_GET (sink_factory));
gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));
return TRUE;
}