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gstreamer/gst/mpeg1videoparse/gstmp1videoparse.c
David Schleef bb23b9a3a2 Fix a bunch of endianness conversions that were done as long instead of int32. Should go into 0.6.1. 
Original commit message from CVS:

Fix a bunch of endianness conversions that were done as long instead of
int32.  Should go into 0.6.1.
2003-04-07 18:43:25 +00:00

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11 KiB
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/* GStreamer
* 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 "gstmp1videoparse.h"
/* Start codes. */
#define SEQ_START_CODE 0x000001b3
#define GOP_START_CODE 0x000001b8
#define PICTURE_START_CODE 0x00000100
#define SLICE_MIN_START_CODE 0x00000101
#define SLICE_MAX_START_CODE 0x000001af
#define EXT_START_CODE 0x000001b5
#define USER_START_CODE 0x000001b2
#define SEQUENCE_ERROR_CODE 0x000001b4
#define SEQ_END_CODE 0x000001b7
/* elementfactory information */
static GstElementDetails mp1videoparse_details = {
"MPEG 1 Video Parser",
"Codec/Parser",
"LGPL",
"Parses and frames MPEG 1 video streams, provides seek",
VERSION,
"Wim Taymans <wim.taymans@chello.be>",
"(C) 2000",
};
static GstPadTemplate*
src_factory (void)
{
return
gst_pad_template_new (
"src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
gst_caps_new (
"mp1videoparse_src",
"video/mpeg",
gst_props_new (
"mpegversion", GST_PROPS_INT (1),
"systemstream", GST_PROPS_BOOLEAN (FALSE),
"sliced", GST_PROPS_BOOLEAN (TRUE),
NULL)),
NULL);
}
static GstPadTemplate*
sink_factory (void)
{
return
gst_pad_template_new (
"sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
gst_caps_new (
"mp1videoparse_sink",
"video/mpeg",
gst_props_new (
"mpegversion", GST_PROPS_INT (1),
"systemstream", GST_PROPS_BOOLEAN (FALSE),
NULL)),
NULL);
}
/* Mp1VideoParse signals and args */
enum {
/* FILL ME */
LAST_SIGNAL
};
enum {
ARG_0,
/* FILL ME */
};
static void gst_mp1videoparse_class_init (Mp1VideoParseClass *klass);
static void gst_mp1videoparse_init (Mp1VideoParse *mp1videoparse);
static void gst_mp1videoparse_chain (GstPad *pad, GstBuffer *buf);
static void gst_mp1videoparse_real_chain (Mp1VideoParse *mp1videoparse, GstBuffer *buf, GstPad *outpad);
/* defined but not used
static void gst_mp1videoparse_flush (Mp1VideoParse *mp1videoparse);
*/
static GstPadTemplate *src_template, *sink_template;
static GstElementClass *parent_class = NULL;
/*static guint gst_mp1videoparse_signals[LAST_SIGNAL] = { 0 }; */
GType
mp1videoparse_get_type (void)
{
static GType mp1videoparse_type = 0;
if (!mp1videoparse_type) {
static const GTypeInfo mp1videoparse_info = {
sizeof(Mp1VideoParseClass), NULL,
NULL,
(GClassInitFunc)gst_mp1videoparse_class_init,
NULL,
NULL,
sizeof(Mp1VideoParse),
0,
(GInstanceInitFunc)gst_mp1videoparse_init,
};
mp1videoparse_type = g_type_register_static(GST_TYPE_ELEMENT, "Mp1VideoParse", &mp1videoparse_info, 0);
}
return mp1videoparse_type;
}
static void
gst_mp1videoparse_class_init (Mp1VideoParseClass *klass)
{
GstElementClass *gstelement_class;
gstelement_class = (GstElementClass*)klass;
parent_class = g_type_class_ref(GST_TYPE_ELEMENT);
}
static void
gst_mp1videoparse_init (Mp1VideoParse *mp1videoparse)
{
mp1videoparse->sinkpad = gst_pad_new_from_template (sink_template, "sink");
gst_element_add_pad(GST_ELEMENT(mp1videoparse),mp1videoparse->sinkpad);
gst_pad_set_chain_function(mp1videoparse->sinkpad,gst_mp1videoparse_chain);
mp1videoparse->srcpad = gst_pad_new_from_template (src_template, "src");
gst_element_add_pad(GST_ELEMENT(mp1videoparse),mp1videoparse->srcpad);
mp1videoparse->partialbuf = NULL;
mp1videoparse->need_resync = FALSE;
mp1videoparse->last_pts = 0;
mp1videoparse->picture_in_buffer = 0;
}
static gboolean
mp1videoparse_valid_sync (gulong head)
{
if (head == SEQ_START_CODE)
return TRUE;
if (head == GOP_START_CODE)
return TRUE;
if (head == PICTURE_START_CODE)
return TRUE;
if (head >= SLICE_MIN_START_CODE &&
head <= SLICE_MAX_START_CODE)
return TRUE;
if (head == USER_START_CODE)
return TRUE;
if (head == EXT_START_CODE)
return TRUE;
return FALSE;
}
static gint
mp1videoparse_find_next_gop (Mp1VideoParse *mp1videoparse, GstBuffer *buf)
{
guchar *data = GST_BUFFER_DATA(buf);
gulong size = GST_BUFFER_SIZE(buf);
gulong offset = 0;
gint sync_zeros = 0;
gboolean have_sync = FALSE;
while (offset < size) {
guchar byte = *(data+offset);
offset++;
if (byte == 0) {
sync_zeros++;
}
else if (byte == 1 && sync_zeros >=2 ) {
sync_zeros = 0;
have_sync = TRUE;
}
else if (have_sync) {
if (byte == (SEQ_START_CODE & 0xff) || byte == (GOP_START_CODE & 0xff)) return offset-4;
else {
sync_zeros = 0;
have_sync = FALSE;
}
}
else {
sync_zeros = 0;
}
}
return -1;
}
/* defined but not used
static void
gst_mp1videoparse_flush (Mp1VideoParse *mp1videoparse)
{
GST_DEBUG (0,"mp1videoparse: flushing");
if (mp1videoparse->partialbuf) {
gst_buffer_unref(mp1videoparse->partialbuf);
mp1videoparse->partialbuf= NULL;
}
mp1videoparse->need_resync = TRUE;
mp1videoparse->in_flush = TRUE;
mp1videoparse->picture_in_buffer = 0;
}
*/
static void
gst_mp1videoparse_chain (GstPad *pad,GstBuffer *buf)
{
Mp1VideoParse *mp1videoparse;
g_return_if_fail (pad != NULL);
g_return_if_fail (GST_IS_PAD (pad));
g_return_if_fail (buf != NULL);
mp1videoparse = GST_MP1VIDEOPARSE (GST_OBJECT_PARENT (pad));
gst_mp1videoparse_real_chain(mp1videoparse, buf, mp1videoparse->srcpad);
}
static void
gst_mp1videoparse_real_chain (Mp1VideoParse *mp1videoparse, GstBuffer *buf, GstPad *outpad)
{
guchar *data;
gulong size, offset = 0;
GstBuffer *outbuf;
gint sync_state;
gboolean have_sync;
guchar sync_byte;
guint32 head;
gint sync_pos;
guint64 time_stamp;
GstBuffer *temp;
/* g_return_if_fail(GST_IS_BUFFER(buf)); */
time_stamp = GST_BUFFER_TIMESTAMP(buf);
/* FIXME, handle events here */
/*
gst_mp1videoparse_flush(mp1videoparse);
*/
if (mp1videoparse->partialbuf) {
GstBuffer *merge;
offset = GST_BUFFER_SIZE(mp1videoparse->partialbuf);
merge = gst_buffer_merge(mp1videoparse->partialbuf, buf);
gst_buffer_unref(mp1videoparse->partialbuf);
gst_buffer_unref(buf);
mp1videoparse->partialbuf = merge;
}
else {
mp1videoparse->partialbuf = buf;
offset = 0;
}
data = GST_BUFFER_DATA(mp1videoparse->partialbuf);
size = GST_BUFFER_SIZE(mp1videoparse->partialbuf);
GST_DEBUG (0,"mp1videoparse: received buffer of %ld bytes %" G_GINT64_FORMAT,size, GST_BUFFER_TIMESTAMP(buf));
head = GUINT32_FROM_BE(*((guint32 *)data));
GST_DEBUG (0,"mp1videoparse: head is %08x", (unsigned int)head);
if (!mp1videoparse_valid_sync(head) || mp1videoparse->need_resync) {
sync_pos = mp1videoparse_find_next_gop(mp1videoparse, mp1videoparse->partialbuf);
if (sync_pos != -1) {
mp1videoparse->need_resync = FALSE;
GST_DEBUG (0,"mp1videoparse: found new gop at %d", sync_pos);
if (sync_pos != 0) {
temp = gst_buffer_create_sub(mp1videoparse->partialbuf, sync_pos, size-sync_pos);
g_assert(temp != NULL);
gst_buffer_unref(mp1videoparse->partialbuf);
mp1videoparse->partialbuf = temp;
data = GST_BUFFER_DATA(mp1videoparse->partialbuf);
size = GST_BUFFER_SIZE(mp1videoparse->partialbuf);
offset = 0;
}
}
else {
GST_DEBUG (0,"mp1videoparse: could not sync");
gst_buffer_unref(mp1videoparse->partialbuf);
mp1videoparse->partialbuf = NULL;
return;
}
}
if (mp1videoparse->picture_in_buffer == 1) {
mp1videoparse->last_pts = time_stamp;
}
sync_state = 0;
have_sync = FALSE;
GST_DEBUG (0,"mp1videoparse: searching sync");
while (offset < size-1) {
sync_byte = *(data + offset);
/*printf(" %d %02x\n", offset, sync_byte); */
if (sync_byte == 0) {
sync_state++;
}
else if ((sync_byte == 1) && (sync_state >=2)) {
GST_DEBUG (0,"mp1videoparse: code 0x000001%02x",data[offset+1]);
if (data[offset+1] == (PICTURE_START_CODE & 0xff)) {
mp1videoparse->picture_in_buffer++;
if (mp1videoparse->picture_in_buffer == 1) {
mp1videoparse->last_pts = time_stamp;
sync_state = 0;
}
else if (mp1videoparse->picture_in_buffer == 2) {
have_sync = TRUE;
break;
}
else {
GST_DEBUG (0,"mp1videoparse: %d in buffer", mp1videoparse->picture_in_buffer);
g_assert_not_reached();
}
}
else sync_state = 0;
}
/* something else... */
else sync_state = 0;
/* go down the buffer */
offset++;
}
if (have_sync) {
offset -= 2;
GST_DEBUG (0,"mp1videoparse: synced at %ld code 0x000001%02x",offset,data[offset+3]);
outbuf = gst_buffer_create_sub(mp1videoparse->partialbuf, 0, offset+4);
g_assert(outbuf != NULL);
GST_BUFFER_TIMESTAMP(outbuf) = mp1videoparse->last_pts;
if (mp1videoparse->in_flush) {
/* FIXME, send a flush event here */
mp1videoparse->in_flush = FALSE;
}
GST_DEBUG (0,"mp1videoparse: pushing %d bytes %" G_GUINT64_FORMAT, GST_BUFFER_SIZE(outbuf), GST_BUFFER_TIMESTAMP(outbuf));
gst_pad_push(outpad, outbuf);
GST_DEBUG (0,"mp1videoparse: pushing done");
mp1videoparse->picture_in_buffer = 0;
temp = gst_buffer_create_sub(mp1videoparse->partialbuf, offset, size-offset);
gst_buffer_unref(mp1videoparse->partialbuf);
mp1videoparse->partialbuf = temp;
}
else {
mp1videoparse->last_pts = time_stamp;
}
}
/* FIXME
static GstElementStateReturn
gst_mp1videoparse_change_state (GstElement *element)
{
Mp1VideoParse *mp1videoparse;
g_return_val_if_fail(GST_IS_MP1VIDEOPARSE(element),GST_STATE_FAILURE);
mp1videoparse = GST_MP1VIDEOPARSE(element);
GST_DEBUG (0,"mp1videoparse: state pending %d", GST_STATE_PENDING(element));
* if going down into NULL state, clear out buffers *
if (GST_STATE_PENDING(element) == GST_STATE_READY) {
gst_mp1videoparse_flush(mp1videoparse);
}
* if we haven't failed already, give the parent class a chance to ;-) *
if (GST_ELEMENT_CLASS(parent_class)->change_state)
return GST_ELEMENT_CLASS(parent_class)->change_state(element);
return GST_STATE_SUCCESS;
}
*/
static gboolean
plugin_init (GModule *module, GstPlugin *plugin)
{
GstElementFactory *factory;
/* create an elementfactory for the mp1videoparse element */
factory = gst_element_factory_new("mp1videoparse",GST_TYPE_MP1VIDEOPARSE,
&mp1videoparse_details);
g_return_val_if_fail(factory != NULL, FALSE);
src_template = src_factory ();
gst_element_factory_add_pad_template (factory, src_template);
sink_template = sink_factory ();
gst_element_factory_add_pad_template (factory, sink_template);
gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));
return TRUE;
}
GstPluginDesc plugin_desc = {
GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"mp1videoparse",
plugin_init
};
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