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gstreamer/gst/mpegstream/gstmpegparse.c
Wim Taymans 72f3cbcb7b Improved seeking and indexing 
Original commit message from CVS:
Improved seeking and indexing
2002-12-26 22:45:10 +00:00

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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 "gstmpegparse.h"
#include "gstmpegclock.h"
static GstFormat scr_format;
/* elementfactory information */
static GstElementDetails mpeg_parse_details = {
"MPEG System Parser",
"Codec/Parser",
"LGPL",
"Parses 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))
#define DEFAULT_MAX_DISCONT 10000
/* GstMPEGParse signals and args */
enum {
/* FILL ME */
LAST_SIGNAL
};
enum {
ARG_0,
ARG_BIT_RATE,
ARG_MPEG2,
ARG_SYNC,
ARG_MAX_DISCONT,
/* FILL ME */
};
GST_PAD_TEMPLATE_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_PAD_TEMPLATE_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 void gst_mpeg_parse_set_clock (GstElement *element, GstClock *clock);
static GstClock* gst_mpeg_parse_get_clock (GstElement *element);
static GstClockTime gst_mpeg_parse_get_time (GstClock *clock, gpointer data);
static gboolean gst_mpeg_parse_parse_packhead (GstMPEGParse *mpeg_parse, GstBuffer *buffer);
static void gst_mpeg_parse_send_data (GstMPEGParse *mpeg_parse, GstData *data, GstClockTime time);
static void gst_mpeg_parse_handle_discont (GstMPEGParse *mpeg_parse);
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 void gst_mpeg_parse_set_property (GObject *object, guint prop_id,
const GValue *value, GParamSpec *pspec);
static void gst_mpeg_parse_set_index (GstElement *element, GstIndex *index);
static GstIndex* gst_mpeg_parse_get_index (GstElement *element);
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("bitrate","bitrate","bitrate",
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));
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_SYNC,
g_param_spec_boolean ("sync", "Sync", "Synchronize on the stream SCR",
FALSE, G_PARAM_READWRITE));
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_MAX_DISCONT,
g_param_spec_int ("max_discont", "Max Discont", "The maximun allowed SCR discontinuity",
0, G_MAXINT, DEFAULT_MAX_DISCONT, G_PARAM_READWRITE));
gobject_class->get_property = gst_mpeg_parse_get_property;
gobject_class->set_property = gst_mpeg_parse_set_property;
gstelement_class->change_state = gst_mpeg_parse_change_state;
gstelement_class->get_clock = gst_mpeg_parse_get_clock;
gstelement_class->set_clock = gst_mpeg_parse_set_clock;
gstelement_class->get_index = gst_mpeg_parse_get_index;
gstelement_class->set_index = gst_mpeg_parse_set_index;
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;
klass->handle_discont = gst_mpeg_parse_handle_discont;
}
static void
gst_mpeg_parse_init (GstMPEGParse *mpeg_parse)
{
mpeg_parse->sinkpad = gst_pad_new_from_template(
GST_PAD_TEMPLATE_GET (sink_factory), "sink");
gst_element_add_pad(GST_ELEMENT(mpeg_parse),mpeg_parse->sinkpad);
gst_pad_set_formats_function (mpeg_parse->sinkpad, gst_mpeg_parse_get_src_formats);
gst_pad_set_convert_function (mpeg_parse->sinkpad, gst_mpeg_parse_convert_src);
mpeg_parse->srcpad = gst_pad_new_from_template(
GST_PAD_TEMPLATE_GET (src_factory), "src");
gst_element_add_pad(GST_ELEMENT(mpeg_parse),mpeg_parse->srcpad);
gst_pad_set_formats_function (mpeg_parse->srcpad, gst_mpeg_parse_get_src_formats);
gst_pad_set_convert_function (mpeg_parse->srcpad, gst_mpeg_parse_convert_src);
gst_pad_set_event_mask_function (mpeg_parse->srcpad, gst_mpeg_parse_get_src_event_masks);
gst_pad_set_event_function (mpeg_parse->srcpad, gst_mpeg_parse_handle_src_event);
gst_pad_set_query_type_function (mpeg_parse->srcpad, gst_mpeg_parse_get_src_query_types);
gst_pad_set_query_function (mpeg_parse->srcpad, gst_mpeg_parse_handle_src_query);
gst_element_set_loop_function (GST_ELEMENT (mpeg_parse), gst_mpeg_parse_loop);
mpeg_parse->packetize = NULL;
mpeg_parse->sync = FALSE;
mpeg_parse->max_discont = DEFAULT_MAX_DISCONT;
mpeg_parse->provided_clock = gst_mpeg_clock_new ("MPEGParseClock",
gst_mpeg_parse_get_time, mpeg_parse);
GST_FLAG_SET (mpeg_parse, GST_ELEMENT_EVENT_AWARE);
}
static GstClock*
gst_mpeg_parse_get_clock (GstElement *element)
{
/* GstMPEGParse *parse = GST_MPEG_PARSE (element); */
/* return parse->provided_clock; */
return NULL;
}
static void
gst_mpeg_parse_set_clock (GstElement *element, GstClock *clock)
{
GstMPEGParse *parse = GST_MPEG_PARSE (element);
parse->clock = clock;
}
static GstClockTime
gst_mpeg_parse_get_time (GstClock *clock, gpointer data)
{
GstMPEGParse *parse = GST_MPEG_PARSE (data);
return MPEGTIME_TO_GSTTIME (parse->current_scr);
}
static void
gst_mpeg_parse_send_data (GstMPEGParse *mpeg_parse, GstData *data, GstClockTime time)
{
if (GST_IS_EVENT (data)) {
GstEvent *event = GST_EVENT (data);
switch (GST_EVENT_TYPE (event)) {
default:
gst_pad_event_default (mpeg_parse->sinkpad, event);
break;
}
}
else {
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) = time;
GST_DEBUG (0, "current_scr %lld", time);
if (GST_PAD_IS_USABLE (mpeg_parse->srcpad))
gst_pad_push (mpeg_parse->srcpad, GST_BUFFER (data));
else
gst_data_unref (data);
}
}
static void
gst_mpeg_parse_handle_discont (GstMPEGParse *mpeg_parse)
{
GstEvent *event;
event = gst_event_new_discontinuous (FALSE, GST_FORMAT_TIME,
MPEGTIME_TO_GSTTIME (mpeg_parse->current_scr), NULL);
if (GST_PAD_IS_USABLE (mpeg_parse->srcpad))
gst_pad_push (mpeg_parse->srcpad, GST_BUFFER (event));
else
gst_event_unref (event);
}
static gboolean
gst_mpeg_parse_parse_packhead (GstMPEGParse *mpeg_parse, GstBuffer *buffer)
{
guint8 *buf;
guint64 scr, scr_adj, scr_orig;
guint32 scr1, scr2;
guint32 new_rate;
GST_DEBUG (0, "in parse_packhead");
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)) {
guint32 scr_ext;
/* :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;
scr_ext = (scr2 & 0x03fe0000) >> 17;
scr = (scr * 300 + scr_ext % 300) / 300;
GST_DEBUG (0, "%lld %d, %08x %08x %lld diff: %lld",
scr, scr_ext, scr1, scr2, mpeg_parse->bytes_since_scr,
scr - mpeg_parse->current_scr);
buf += 6;
new_rate = (GUINT32_FROM_BE ((*(guint32 *) buf)) & 0xfffffc00) >> 10;
}
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;
}
scr_orig = scr;
mpeg_parse->bytes_since_scr = 0;
scr_adj = scr + mpeg_parse->adjust;
if (mpeg_parse->next_scr == -1) {
mpeg_parse->next_scr = scr;
}
GST_DEBUG (0, "SCR is %llu (%llu) next: %lld (%lld) diff: %lld (%lld)",
scr,
MPEGTIME_TO_GSTTIME (scr),
mpeg_parse->next_scr,
MPEGTIME_TO_GSTTIME (mpeg_parse->next_scr),
scr - mpeg_parse->next_scr,
MPEGTIME_TO_GSTTIME (scr) -
MPEGTIME_TO_GSTTIME (mpeg_parse->next_scr));
if (ABS ((gint64)mpeg_parse->next_scr - (gint64)(scr_adj)) > mpeg_parse->max_discont) {
GST_DEBUG (0, "discontinuity detected; expected: %llu got: %llu real:%lld adjust:%lld",
mpeg_parse->next_scr, scr_adj, scr, mpeg_parse->adjust);
mpeg_parse->adjust = mpeg_parse->next_scr - scr;
scr = mpeg_parse->next_scr;
GST_DEBUG (0, "new adjust: %lld", mpeg_parse->adjust);
}
else {
scr = scr_adj;
}
if (mpeg_parse->index && GST_INDEX_IS_WRITABLE (mpeg_parse->index)) {
/* update index if any */
gst_index_add_association (mpeg_parse->index, mpeg_parse->index_id,
GST_ACCOCIATION_FLAG_KEY_UNIT,
GST_FORMAT_BYTES, GST_BUFFER_OFFSET (buffer),
GST_FORMAT_TIME, MPEGTIME_TO_GSTTIME (scr), 0);
}
mpeg_parse->current_scr = scr;
mpeg_parse->scr_pending = FALSE;
if (mpeg_parse->mux_rate != new_rate) {
mpeg_parse->mux_rate = new_rate;
g_object_notify (G_OBJECT (mpeg_parse), "bitrate");
GST_DEBUG (0, "stream is %1.3fMbs", (mpeg_parse->mux_rate * 400) / 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;
GstClockTime time;
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, "have chunk 0x%02X", 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 ("******** 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);
}
}
}
}
}
time = MPEGTIME_TO_GSTTIME (mpeg_parse->current_scr);
if (GST_IS_EVENT (data)) {
GstEvent *event = GST_EVENT (data);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_DISCONTINUOUS:
GST_DEBUG (GST_CAT_EVENT, "event: %d\n", GST_EVENT_TYPE (data));
mpeg_parse->discont_pending = TRUE;
mpeg_parse->packetize->resync = TRUE;
gst_event_unref (event);
return;
default:
break;
}
if (CLASS (mpeg_parse)->send_data)
CLASS (mpeg_parse)->send_data (mpeg_parse, data, time);
else
gst_event_unref (event);
}
else {
guint64 size;
/* we're not sending data as long as no new SCR was found */
if (mpeg_parse->discont_pending) {
if (!mpeg_parse->scr_pending) {
if (mpeg_parse->clock && mpeg_parse->sync) {
gst_clock_handle_discont (mpeg_parse->clock, MPEGTIME_TO_GSTTIME (mpeg_parse->current_scr));
}
if (CLASS (mpeg_parse)->handle_discont) {
CLASS (mpeg_parse)->handle_discont (mpeg_parse);
}
mpeg_parse->discont_pending = FALSE;
}
else {
GST_DEBUG (0, "waiting for SCR\n");
}
gst_buffer_unref (GST_BUFFER (data));
return;
}
size = GST_BUFFER_SIZE (data);
mpeg_parse->bytes_since_scr += size;
if (CLASS (mpeg_parse)->send_data)
CLASS (mpeg_parse)->send_data (mpeg_parse, data, time);
if (mpeg_parse->clock && mpeg_parse->sync && !mpeg_parse->discont_pending) {
GST_DEBUG (GST_CAT_CLOCK, "syncing mpegparse");
gst_element_clock_wait (GST_ELEMENT (mpeg_parse), mpeg_parse->clock, time, NULL);
}
if (mpeg_parse->current_scr != -1)
{
guint64 scr, bss, br;
scr = mpeg_parse->current_scr;
bss = mpeg_parse->bytes_since_scr;
br = mpeg_parse->mux_rate * 50;
if (br) {
if (GST_MPEG_PACKETIZE_IS_MPEG2 (mpeg_parse->packetize)) {
/*
* The mpeg spec says something like this, but that doesn't really work:
*
* mpeg_parse->next_scr = (scr * br + bss * 90000LL) / (90000LL + br);
*/
mpeg_parse->next_scr = scr + (bss * 90000LL) / br;
}
else {
/* we are interpolating the scr here */
mpeg_parse->next_scr = scr + (bss * 90000LL) / br;
}
}
else {
/* no bitrate known */
mpeg_parse->next_scr = scr;
}
GST_DEBUG (0, "size: %lld, total since SCR: %lld, next SCR: %lld",
size, bss, mpeg_parse->next_scr);
}
}
}
const GstFormat*
gst_mpeg_parse_get_src_formats (GstPad *pad)
{
static const GstFormat formats[] = {
GST_FORMAT_BYTES,
GST_FORMAT_TIME,
0
};
return formats;
}
gboolean
gst_mpeg_parse_convert_src (GstPad *pad, GstFormat src_format, gint64 src_value,
GstFormat *dest_format, gint64 *dest_value)
{
gboolean res = TRUE;
GstMPEGParse *mpeg_parse = GST_MPEG_PARSE (gst_pad_get_parent (pad));
switch (src_format) {
case GST_FORMAT_BYTES:
switch (*dest_format) {
case GST_FORMAT_DEFAULT:
*dest_format = GST_FORMAT_TIME;
case GST_FORMAT_TIME:
if (mpeg_parse->mux_rate == 0)
res = FALSE;
else
*dest_value = src_value * GST_SECOND / (mpeg_parse->mux_rate * 50);
break;
default:
res = FALSE;
}
break;
case GST_FORMAT_TIME:
switch (*dest_format) {
case GST_FORMAT_DEFAULT:
*dest_format = GST_FORMAT_BYTES;
case GST_FORMAT_BYTES:
*dest_value = mpeg_parse->mux_rate * 50 * src_value / GST_SECOND;
break;
default:
res = FALSE;
}
break;
default:
res = FALSE;
break;
}
return res;
}
const GstPadQueryType*
gst_mpeg_parse_get_src_query_types (GstPad *pad)
{
static const GstPadQueryType types[] = {
GST_PAD_QUERY_TOTAL,
GST_PAD_QUERY_POSITION,
0
};
return types;
}
gboolean
gst_mpeg_parse_handle_src_query (GstPad *pad, GstPadQueryType type,
GstFormat *format, gint64 *value)
{
gboolean res = TRUE;
GstMPEGParse *mpeg_parse = GST_MPEG_PARSE (gst_pad_get_parent (pad));
GstFormat src_format;
gint64 src_value;
switch (type) {
case GST_PAD_QUERY_TOTAL:
{
switch (*format) {
case GST_FORMAT_DEFAULT:
*format = GST_FORMAT_TIME;
/* fallthrough */
default:
src_format = GST_FORMAT_BYTES;
if (!gst_pad_query (GST_PAD_PEER (mpeg_parse->sinkpad),
GST_PAD_QUERY_TOTAL, &src_format, &src_value))
{
res = FALSE;
}
break;
}
break;
}
case GST_PAD_QUERY_POSITION:
{
switch (*format) {
case GST_FORMAT_DEFAULT:
*format = GST_FORMAT_TIME;
/* fallthrough */
default:
src_format = GST_FORMAT_TIME;
src_value = MPEGTIME_TO_GSTTIME (mpeg_parse->current_scr);
break;
}
break;
}
default:
res = FALSE;
break;
}
/* bring to requested format */
if (res)
res = gst_pad_convert (pad, src_format, src_value, format, value);
return res;
}
const GstEventMask*
gst_mpeg_parse_get_src_event_masks (GstPad *pad)
{
static const GstEventMask masks[] = {
{ GST_EVENT_SEEK, GST_SEEK_METHOD_SET | GST_SEEK_FLAG_FLUSH },
{ 0, }
};
return masks;
}
static gboolean
index_seek (GstPad *pad, GstEvent *event, guint64 *offset, gint64 *scr)
{
GstIndexEntry *entry;
GstMPEGParse *mpeg_parse = GST_MPEG_PARSE (gst_pad_get_parent (pad));
entry = gst_index_get_assoc_entry (mpeg_parse->index, mpeg_parse->index_id,
GST_INDEX_LOOKUP_BEFORE, 0,
GST_EVENT_SEEK_FORMAT (event),
GST_EVENT_SEEK_OFFSET (event));
if (!entry)
return FALSE;
if (gst_index_entry_assoc_map (entry, GST_FORMAT_BYTES, offset)) {
gint64 time;
if (gst_index_entry_assoc_map (entry, GST_FORMAT_TIME, &time)) {
*scr = GSTTIME_TO_MPEGTIME (time);
}
return TRUE;
}
return FALSE;
}
static gboolean
normal_seek (GstPad *pad, GstEvent *event, guint64 *offset, gint64 *scr)
{
gboolean res;
GstFormat format;
gint64 time;
/* bring offset to bytes */
format = GST_FORMAT_BYTES;
res = gst_pad_convert (pad,
GST_EVENT_SEEK_FORMAT (event),
GST_EVENT_SEEK_OFFSET (event),
&format,
offset);
/* bring offset to time */
format = GST_FORMAT_TIME;
res &= gst_pad_convert (pad,
GST_EVENT_SEEK_FORMAT (event),
GST_EVENT_SEEK_OFFSET (event),
&format,
&time);
/* convert to scr */
*scr = GSTTIME_TO_MPEGTIME (time);
return res;
}
gboolean
gst_mpeg_parse_handle_src_event (GstPad *pad, GstEvent *event)
{
gboolean res = FALSE;
GstMPEGParse *mpeg_parse = GST_MPEG_PARSE (gst_pad_get_parent (pad));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_SEEK:
{
guint64 desired_offset;
guint64 expected_scr;
/* first to to use the index if we have one */
if (mpeg_parse->index)
res = index_seek (pad, event, &desired_offset, &expected_scr);
/* nothing found, try fuzzy seek */
if (!res)
res = normal_seek (pad, event, &desired_offset, &expected_scr);
if (!res)
break;
GST_DEBUG (0, "sending seek to %lld", desired_offset);
if (gst_bytestream_seek (mpeg_parse->packetize->bs, desired_offset, GST_SEEK_METHOD_SET)) {
mpeg_parse->discont_pending = TRUE;
mpeg_parse->scr_pending = TRUE;
mpeg_parse->next_scr = expected_scr;
mpeg_parse->current_scr = -1;
mpeg_parse->adjust = 0;
res = TRUE;
}
break;
}
default:
break;
}
gst_event_unref (event);
return res;
}
static GstElementStateReturn
gst_mpeg_parse_change_state (GstElement *element)
{
GstMPEGParse *mpeg_parse = GST_MPEG_PARSE (element);
switch (GST_STATE_TRANSITION (element)) {
case GST_STATE_READY_TO_PAUSED:
if (!mpeg_parse->packetize) {
mpeg_parse->packetize = gst_mpeg_packetize_new (mpeg_parse->sinkpad, GST_MPEG_PACKETIZE_SYSTEM);
}
/* initialize parser state */
mpeg_parse->current_scr = 0;
mpeg_parse->bytes_since_scr = 0;
mpeg_parse->adjust = 0;
mpeg_parse->next_scr = 0;
/* zero counters (should be done at RUNNING?) */
mpeg_parse->mux_rate = 0;
mpeg_parse->discont_pending = FALSE;
mpeg_parse->scr_pending = FALSE;
break;
case GST_STATE_PAUSED_TO_READY:
if (mpeg_parse->packetize) {
gst_mpeg_packetize_destroy (mpeg_parse->packetize);
mpeg_parse->packetize = NULL;
}
break;
default:
break;
}
return GST_ELEMENT_CLASS (parent_class)->change_state (element);
}
static void
gst_mpeg_parse_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
{
GstMPEGParse *mpeg_parse;
mpeg_parse = GST_MPEG_PARSE(object);
switch (prop_id) {
case ARG_BIT_RATE:
g_value_set_uint (value, mpeg_parse->mux_rate * 400);
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;
case ARG_SYNC:
g_value_set_boolean (value, mpeg_parse->sync);
break;
case ARG_MAX_DISCONT:
g_value_set_int (value, mpeg_parse->max_discont);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_mpeg_parse_set_property (GObject *object, guint prop_id,
const GValue *value, GParamSpec *pspec)
{
GstMPEGParse *mpeg_parse;
mpeg_parse = GST_MPEG_PARSE (object);
switch (prop_id) {
case ARG_SYNC:
mpeg_parse->sync = g_value_get_boolean (value);
break;
case ARG_MAX_DISCONT:
mpeg_parse->max_discont = g_value_get_int (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_mpeg_parse_set_index (GstElement *element, GstIndex *index)
{
GstMPEGParse *mpeg_parse;
mpeg_parse = GST_MPEG_PARSE (element);
mpeg_parse->index = index;
gst_index_get_writer_id (index, GST_OBJECT (mpeg_parse->sinkpad),
&mpeg_parse->index_id);
gst_index_add_format (index, mpeg_parse->index_id, scr_format);
}
static GstIndex*
gst_mpeg_parse_get_index (GstElement *element)
{
GstMPEGParse *mpeg_parse;
mpeg_parse = GST_MPEG_PARSE (element);
return mpeg_parse->index;
}
gboolean
gst_mpeg_parse_plugin_init (GModule *module, GstPlugin *plugin)
{
GstElementFactory *factory;
/* this filter needs the bytestream package */
if (!gst_library_load ("gstbytestream"))
return FALSE;
/* create an elementfactory for the mpeg_parse element */
factory = gst_element_factory_new ("mpegparse", GST_TYPE_MPEG_PARSE,
&mpeg_parse_details);
g_return_val_if_fail(factory != NULL, FALSE);
scr_format = gst_format_register ("scr", "The MPEG system clock reference time");
gst_element_factory_add_pad_template (factory, GST_PAD_TEMPLATE_GET (src_factory));
gst_element_factory_add_pad_template (factory, GST_PAD_TEMPLATE_GET (sink_factory));
gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));
return TRUE;
}
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