mirrors/gstreamer
mirrors/gstreamer
1
1
Fork 0
mirror of https://gitlab.freedesktop.org/gstreamer/gstreamer.git synced 2024-11-14 05:12:09 +00:00
Code Issues 1 Projects Releases Wiki Activity
gstreamer/gst/mpegstream/gstmpegparse.c
Tim-Philipp Müller d26b52d5ce gst/mpegstream/gstmpegparse.c: Use our alignment-safe macros here too, since we can't assume that 
Original commit message from CVS:
* gst/mpegstream/gstmpegparse.c: (gst_mpeg_parse_parse_packhead):
Use our alignment-safe macros here too, since we can't assume that
GST_BUFFER_DATA is aligned (these are subbuffers we're dealing with
here).
2006-12-14 12:05:49 +00:00

1337 lines
39 KiB
C
Raw Blame History

/* 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstmpegparse.h"
#include "gstmpegclock.h"
static GstFormat scr_format;
GST_DEBUG_CATEGORY_STATIC (gstmpegparse_debug);
#define GST_CAT_DEFAULT (gstmpegparse_debug)
GST_DEBUG_CATEGORY_EXTERN (GST_CAT_SEEK);
#define MP_INVALID_SCR ((guint64)(-1))
#define MP_MUX_RATE_MULT 50
#define MP_MIN_VALID_BSS 8192
#define MP_MAX_VALID_BSS 16384
/*
* Hysteresis value to limit the
* total predicted time skipping about
*/
#define MP_SCR_RATE_HYST 0.08
/* elementfactory information */
static GstElementDetails mpeg_parse_details = {
"MPEG System Parser",
"Codec/Parser",
"Parses MPEG1 and MPEG2 System Streams",
"Erik Walthinsen <omega@cse.ogi.edu>\n" "Wim Taymans <wim.taymans@chello.be>"
};
#define CLASS(o) GST_MPEG_PARSE_CLASS (G_OBJECT_GET_CLASS (o))
#define DEFAULT_MAX_SCR_GAP 120000
/* GstMPEGParse signals and args */
enum
{
SIGNAL_REACHED_OFFSET,
LAST_SIGNAL
};
enum
{
ARG_0,
ARG_MAX_SCR_GAP,
ARG_BYTE_OFFSET,
ARG_TIME_OFFSET
/* FILL ME */
};
static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/mpeg, "
"mpegversion = (int) [ 1, 2 ], " "systemstream = (boolean) TRUE")
);
static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/mpeg, "
"mpegversion = (int) [ 1, 2 ], " "systemstream = (boolean) TRUE")
);
#define _do_init(bla) \
GST_DEBUG_CATEGORY_INIT (gstmpegparse_debug, "mpegparse", 0, \
"MPEG parser element");
GST_BOILERPLATE_FULL (GstMPEGParse, gst_mpeg_parse, GstElement,
GST_TYPE_ELEMENT, _do_init);
static void gst_mpeg_parse_class_init (GstMPEGParseClass * klass);
static GstStateChangeReturn gst_mpeg_parse_change_state (GstElement * element,
GstStateChange transition);
static gboolean gst_mpeg_parse_parse_packhead (GstMPEGParse * mpeg_parse,
GstBuffer * buffer);
static void gst_mpeg_parse_reset (GstMPEGParse * mpeg_parse);
static GstClockTime gst_mpeg_parse_adjust_ts (GstMPEGParse * mpeg_parse,
GstClockTime ts);
static GstFlowReturn gst_mpeg_parse_send_buffer (GstMPEGParse * mpeg_parse,
GstBuffer * buffer, GstClockTime time);
static gboolean gst_mpeg_parse_process_event (GstMPEGParse * mpeg_parse,
GstEvent * event);
static gboolean gst_mpeg_parse_send_event (GstMPEGParse * mpeg_parse,
GstEvent * event);
static void gst_mpeg_parse_pad_added (GstElement * element, GstPad * pad);
static gboolean gst_mpeg_parse_event (GstPad * pad, GstEvent * event);
static GstFlowReturn gst_mpeg_parse_chain (GstPad * pad, GstBuffer * buf);
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 guint gst_mpeg_parse_signals[LAST_SIGNAL] = { 0 };
static void
gst_mpeg_parse_base_init (gpointer klass)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
gst_element_class_set_details (element_class, &mpeg_parse_details);
}
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_peek_parent (klass);
gst_mpeg_parse_signals[SIGNAL_REACHED_OFFSET] =
g_signal_new ("reached-offset", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST, G_STRUCT_OFFSET (GstMPEGParseClass, reached_offset),
NULL, NULL, gst_marshal_VOID__VOID, G_TYPE_NONE, 0);
gobject_class->get_property = gst_mpeg_parse_get_property;
gobject_class->set_property = gst_mpeg_parse_set_property;
gstelement_class->pad_added = gst_mpeg_parse_pad_added;
gstelement_class->change_state = gst_mpeg_parse_change_state;
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->adjust_ts = gst_mpeg_parse_adjust_ts;
klass->send_buffer = gst_mpeg_parse_send_buffer;
klass->process_event = gst_mpeg_parse_process_event;
klass->send_event = gst_mpeg_parse_send_event;
/* FIXME: this is a hack. We add the pad templates here instead
* in the base_init function, since the derived class (mpegdemux)
* uses different pads. IMO, this is wrong. */
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&src_factory));
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&sink_factory));
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_MAX_SCR_GAP,
g_param_spec_int ("max_scr_gap", "Max SCR gap",
"Maximum allowed gap between expected and actual "
"SCR values. -1 means never adjust.", -1, G_MAXINT,
DEFAULT_MAX_SCR_GAP, G_PARAM_READWRITE));
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_BYTE_OFFSET,
g_param_spec_uint64 ("byte-offset", "Byte Offset",
"Emit reached-offset signal when the byte offset is reached.",
0, G_MAXUINT64, G_MAXUINT64, G_PARAM_READWRITE));
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_TIME_OFFSET,
g_param_spec_uint64 ("time-offset", "Time Offset",
"Time offset in the stream.",
0, G_MAXUINT64, G_MAXUINT64, G_PARAM_READABLE));
}
static void
gst_mpeg_parse_init (GstMPEGParse * mpeg_parse, GstMPEGParseClass * klass)
{
GstElementClass *gstelement_class;
GstPadTemplate *templ;
gstelement_class = GST_ELEMENT_GET_CLASS (mpeg_parse);
mpeg_parse->packetize = NULL;
mpeg_parse->max_scr_gap = DEFAULT_MAX_SCR_GAP;
mpeg_parse->byte_offset = G_MAXUINT64;
gst_mpeg_parse_reset (mpeg_parse);
templ = gst_element_class_get_pad_template (gstelement_class, "sink");
mpeg_parse->sinkpad = gst_pad_new_from_template (templ, "sink");
gst_element_add_pad (GST_ELEMENT (mpeg_parse), mpeg_parse->sinkpad);
if ((templ = gst_element_class_get_pad_template (gstelement_class, "src"))) {
mpeg_parse->srcpad = gst_pad_new_from_template (templ, "src");
gst_element_add_pad (GST_ELEMENT (mpeg_parse), mpeg_parse->srcpad);
gst_pad_set_event_function (mpeg_parse->srcpad,
GST_DEBUG_FUNCPTR (gst_mpeg_parse_handle_src_event));
gst_pad_set_query_type_function (mpeg_parse->srcpad,
GST_DEBUG_FUNCPTR (gst_mpeg_parse_get_src_query_types));
gst_pad_set_query_function (mpeg_parse->srcpad,
GST_DEBUG_FUNCPTR (gst_mpeg_parse_handle_src_query));
gst_pad_use_fixed_caps (mpeg_parse->srcpad);
}
gst_pad_set_event_function (mpeg_parse->sinkpad,
GST_DEBUG_FUNCPTR (gst_mpeg_parse_event));
gst_pad_set_chain_function (mpeg_parse->sinkpad,
GST_DEBUG_FUNCPTR (gst_mpeg_parse_chain));
}
#ifdef FIXME
static void
gst_mpeg_parse_update_streaminfo (GstMPEGParse * mpeg_parse)
{
GstProps *props;
GstPropsEntry *entry;
gboolean mpeg2 = GST_MPEG_PACKETIZE_IS_MPEG2 (mpeg_parse->packetize);
GstCaps *caps;
props = gst_props_empty_new ();
entry = gst_props_entry_new ("mpegversion", G_TYPE_INT (mpeg2 ? 2 : 1));
gst_props_add_entry (props, (GstPropsEntry *) entry);
entry =
gst_props_entry_new ("bitrate", G_TYPE_INT (mpeg_parse->mux_rate * 8));
gst_props_add_entry (props, (GstPropsEntry *) entry);
caps = gst_caps_new ("mpeg_streaminfo",
"application/x-gst-streaminfo", props);
gst_caps_replace_sink (&mpeg_parse->streaminfo, caps);
g_object_notify (G_OBJECT (mpeg_parse), "streaminfo");
}
#endif
static void
gst_mpeg_parse_reset (GstMPEGParse * mpeg_parse)
{
GST_DEBUG_OBJECT (mpeg_parse, "Resetting mpeg_parse");
mpeg_parse->first_scr = MP_INVALID_SCR;
mpeg_parse->first_scr_pos = 0;
mpeg_parse->last_scr = MP_INVALID_SCR;
mpeg_parse->last_scr_pos = 0;
mpeg_parse->scr_rate = 0;
mpeg_parse->avg_bitrate_time = 0;
mpeg_parse->avg_bitrate_bytes = 0;
mpeg_parse->mux_rate = 0;
mpeg_parse->current_scr = MP_INVALID_SCR;
mpeg_parse->next_scr = 0;
mpeg_parse->bytes_since_scr = 0;
mpeg_parse->current_ts = 0;
mpeg_parse->do_adjust = TRUE;
mpeg_parse->pending_newsegment = TRUE;
mpeg_parse->adjust = 0;
/* Initialize the current segment. */
GST_DEBUG_OBJECT (mpeg_parse, "Resetting current segment");
gst_segment_init (&mpeg_parse->current_segment, GST_FORMAT_TIME);
}
static GstClockTime
gst_mpeg_parse_adjust_ts (GstMPEGParse * mpeg_parse, GstClockTime ts)
{
if (!GST_CLOCK_TIME_IS_VALID (ts)) {
return GST_CLOCK_TIME_NONE;
}
if (mpeg_parse->do_adjust) {
/* Close the SCR gaps. */
return ts + MPEGTIME_TO_GSTTIME (mpeg_parse->adjust);
} else {
if (ts >= mpeg_parse->current_segment.start) {
return ts;
} else {
/* The timestamp lies outside the current segment. Return an
invalid timestamp instead. */
return GST_CLOCK_TIME_NONE;
}
}
}
static GstFlowReturn
gst_mpeg_parse_send_buffer (GstMPEGParse * mpeg_parse, GstBuffer * buffer,
GstClockTime time)
{
GstFlowReturn result = GST_FLOW_OK;
if (!GST_PAD_CAPS (mpeg_parse->srcpad)) {
gboolean mpeg2 = GST_MPEG_PACKETIZE_IS_MPEG2 (mpeg_parse->packetize);
GstCaps *caps;
caps = gst_caps_new_simple ("video/mpeg",
"mpegversion", G_TYPE_INT, (mpeg2 ? 2 : 1),
"systemstream", G_TYPE_BOOLEAN, TRUE,
"parsed", G_TYPE_BOOLEAN, TRUE, NULL);
if (!gst_pad_set_caps (mpeg_parse->srcpad, caps)) {
GST_ELEMENT_ERROR (GST_ELEMENT (mpeg_parse),
CORE, NEGOTIATION, (NULL), ("failed to set caps"));
gst_caps_unref (caps);
gst_buffer_unref (buffer);
return GST_FLOW_ERROR;
}
gst_caps_unref (caps);
}
GST_BUFFER_TIMESTAMP (buffer) = time;
GST_DEBUG_OBJECT (mpeg_parse, "current buffer time: %" GST_TIME_FORMAT,
GST_TIME_ARGS (time));
gst_buffer_set_caps (buffer, GST_PAD_CAPS (mpeg_parse->srcpad));
result = gst_pad_push (mpeg_parse->srcpad, buffer);
return result;
}
static gboolean
gst_mpeg_parse_process_event (GstMPEGParse * mpeg_parse, GstEvent * event)
{
gboolean ret = FALSE;
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_NEWSEGMENT:
{
gboolean update;
gdouble rate;
GstFormat format;
gint64 start, stop, time;
gst_event_parse_new_segment (event, &update, &rate, &format,
&start, &stop, &time);
if (format == GST_FORMAT_TIME && (GST_CLOCK_TIME_IS_VALID (time))) {
/* We are receiving segments from upstream. Don't try to adjust
SCR values. */
mpeg_parse->do_adjust = FALSE;
mpeg_parse->adjust = 0;
if (!update && mpeg_parse->current_segment.stop != -1) {
/* Close the current segment. */
if (CLASS (mpeg_parse)->send_event) {
CLASS (mpeg_parse)->send_event (mpeg_parse,
gst_event_new_new_segment (TRUE,
mpeg_parse->current_segment.rate,
GST_FORMAT_TIME,
mpeg_parse->current_segment.start,
mpeg_parse->current_segment.stop,
mpeg_parse->current_segment.time));
}
}
/* Update the current segment. */
GST_DEBUG_OBJECT (mpeg_parse,
"Updating current segment with newsegment");
gst_segment_set_newsegment (&mpeg_parse->current_segment,
update, rate, format, start, stop, time);
if (!update) {
/* Send a newsegment event for the new current segment. */
if (CLASS (mpeg_parse)->send_event) {
CLASS (mpeg_parse)->send_event (mpeg_parse,
gst_event_new_new_segment (FALSE, rate, GST_FORMAT_TIME,
start, -1, time));
}
}
}
mpeg_parse->packetize->resync = TRUE;
gst_event_unref (event);
ret = TRUE;
break;
}
case GST_EVENT_FLUSH_STOP:{
/* Forward the event. */
if (CLASS (mpeg_parse)->send_event) {
ret = CLASS (mpeg_parse)->send_event (mpeg_parse, event);
} else {
gst_event_unref (event);
}
/* Reset the internal fields. */
gst_mpeg_parse_reset (mpeg_parse);
gst_mpeg_packetize_flush_cache (mpeg_parse->packetize);
break;
}
case GST_EVENT_EOS:
GST_DEBUG_OBJECT (mpeg_parse, "EOS");
/* fall through to default handler */
default:
if (CLASS (mpeg_parse)->send_event) {
ret = CLASS (mpeg_parse)->send_event (mpeg_parse, event);
} else {
gst_event_unref (event);
}
break;
}
return ret;
}
static gboolean
gst_mpeg_parse_send_event (GstMPEGParse * mpeg_parse, GstEvent * event)
{
GstIterator *it;
gpointer pad;
gboolean ret = TRUE;
/* Send event to all source pads of this element. */
it = gst_element_iterate_src_pads (GST_ELEMENT (mpeg_parse));
while (TRUE) {
switch (gst_iterator_next (it, &pad)) {
case GST_ITERATOR_OK:
gst_event_ref (event);
gst_pad_push_event (GST_PAD (pad), event);
gst_object_unref (GST_OBJECT (pad));
break;
case GST_ITERATOR_RESYNC:
gst_iterator_resync (it);
break;
case GST_ITERATOR_DONE:
goto done;
case GST_ITERATOR_ERROR:
ret = FALSE;
goto done;
}
}
done:
gst_iterator_free (it);
gst_event_unref (event);
return ret;
}
static void
gst_mpeg_parse_pad_added (GstElement * element, GstPad * pad)
{
GstMPEGParse *mpeg_parse;
GstEvent *event;
if (GST_PAD_IS_SINK (pad)) {
return;
}
mpeg_parse = GST_MPEG_PARSE (element);
/* For each new added pad, send a newsegment event so it knows about
* the current time. This is required because MPEG allows any sort
* of order of packets, and new substreams can be found at any
* time. */
event = gst_event_new_new_segment (FALSE,
mpeg_parse->current_segment.rate,
GST_FORMAT_TIME, mpeg_parse->current_segment.start,
-1, mpeg_parse->current_segment.start);
gst_pad_push_event (pad, event);
}
static gboolean
gst_mpeg_parse_parse_packhead (GstMPEGParse * mpeg_parse, GstBuffer * buffer)
{
guint8 *buf;
guint64 prev_scr, scr, diff;
guint32 scr1, scr2;
guint32 new_rate;
guint64 offset;
buf = GST_BUFFER_DATA (buffer);
buf += 4;
scr1 = GST_READ_UINT32_BE (buf);
scr2 = GST_READ_UINT32_BE (buf + 4);
/* Extract the SCR and rate values from the header. */
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 = ((guint64) scr1 & 0x38000000) << 3;
scr |= ((guint64) scr1 & 0x03fff800) << 4;
scr |= ((guint64) scr1 & 0x000003ff) << 5;
scr |= ((guint64) scr2 & 0xf8000000) >> 27;
scr_ext = (scr2 & 0x03fe0000) >> 17;
scr = (scr * 300 + scr_ext % 300) / 300;
GST_LOG_OBJECT (mpeg_parse, "%" G_GINT64_FORMAT " %d, %08x %08x %"
G_GINT64_FORMAT " diff: %" G_GINT64_FORMAT,
scr, scr_ext, scr1, scr2, mpeg_parse->bytes_since_scr,
scr - mpeg_parse->current_scr);
buf += 6;
new_rate = (GST_READ_UINT32_BE (buf) & 0xfffffc00) >> 10;
} else {
scr = ((guint64) scr1 & 0x0e000000) << 5;
scr |= ((guint64) scr1 & 0x00fffe00) << 6;
scr |= ((guint64) scr1 & 0x000000ff) << 7;
scr |= ((guint64) scr2 & 0xfe000000) >> 25;
buf += 5;
/* we do this byte by byte because buf[3] might be outside of buf's
* memory space */
new_rate = ((gint32) buf[0] & 0x7f) << 15;
new_rate |= ((gint32) buf[1]) << 7;
new_rate |= buf[2] >> 1;
}
new_rate *= MP_MUX_RATE_MULT;
/* Deal with SCR overflow */
if (mpeg_parse->current_scr != MP_INVALID_SCR) {
guint32 diff;
diff = scr - mpeg_parse->current_scr;
if (diff < 4 * CLOCK_FREQ)
scr = mpeg_parse->current_scr + diff;
}
prev_scr = mpeg_parse->current_scr;
mpeg_parse->current_scr = scr;
if (mpeg_parse->do_adjust && mpeg_parse->pending_newsegment) {
/* Open a new segment. */
gst_segment_set_newsegment (&mpeg_parse->current_segment,
FALSE, 1.0, GST_FORMAT_TIME, MPEGTIME_TO_GSTTIME (scr), -1,
MPEGTIME_TO_GSTTIME (scr));
CLASS (mpeg_parse)->send_event (mpeg_parse,
gst_event_new_new_segment (FALSE, mpeg_parse->current_segment.rate,
GST_FORMAT_TIME, mpeg_parse->current_segment.start, -1,
mpeg_parse->current_segment.time));
mpeg_parse->pending_newsegment = FALSE;
/* The first SCR seen should not lead to timestamp adjustment. */
mpeg_parse->next_scr = scr;
}
if (mpeg_parse->next_scr == MP_INVALID_SCR) {
mpeg_parse->next_scr = mpeg_parse->current_scr;
}
/* Update the first SCR. */
if ((mpeg_parse->first_scr == MP_INVALID_SCR) ||
(mpeg_parse->current_scr < mpeg_parse->first_scr)) {
mpeg_parse->first_scr = mpeg_parse->current_scr;
mpeg_parse->first_scr_pos = gst_mpeg_packetize_tell (mpeg_parse->packetize);
}
/* Update the last SCR. */
if ((mpeg_parse->last_scr == MP_INVALID_SCR) ||
(mpeg_parse->current_scr > mpeg_parse->last_scr)) {
mpeg_parse->last_scr = mpeg_parse->current_scr;
mpeg_parse->last_scr_pos = gst_mpeg_packetize_tell (mpeg_parse->packetize);
}
GST_LOG_OBJECT (mpeg_parse,
"SCR is %" G_GUINT64_FORMAT
" (%" G_GUINT64_FORMAT ") next: %"
G_GINT64_FORMAT " (%" G_GINT64_FORMAT
") diff: %" G_GINT64_FORMAT " (%"
G_GINT64_FORMAT ")",
mpeg_parse->current_scr,
MPEGTIME_TO_GSTTIME (mpeg_parse->current_scr),
mpeg_parse->next_scr,
MPEGTIME_TO_GSTTIME (mpeg_parse->next_scr),
mpeg_parse->current_scr - mpeg_parse->next_scr,
MPEGTIME_TO_GSTTIME (mpeg_parse->current_scr) -
MPEGTIME_TO_GSTTIME (mpeg_parse->next_scr));
/* Watch out for integer overflows... */
if (mpeg_parse->next_scr > scr) {
diff = mpeg_parse->next_scr - scr;
} else {
diff = scr - mpeg_parse->next_scr;
}
if (mpeg_parse->do_adjust && diff > mpeg_parse->max_scr_gap) {
/* SCR gap found, fix the adjust value. */
GST_DEBUG_OBJECT (mpeg_parse, "SCR gap detected; expected: %"
G_GUINT64_FORMAT " got: %" G_GUINT64_FORMAT,
mpeg_parse->next_scr, mpeg_parse->current_scr);
mpeg_parse->adjust +=
(gint64) mpeg_parse->next_scr - (gint64) mpeg_parse->current_scr;
GST_DEBUG_OBJECT (mpeg_parse, "new adjust: %" G_GINT64_FORMAT,
mpeg_parse->adjust);
}
/* Update the current timestamp. */
mpeg_parse->current_ts = CLASS (mpeg_parse)->adjust_ts (mpeg_parse,
MPEGTIME_TO_GSTTIME (mpeg_parse->current_scr));
/* Check for the reached offset signal. */
offset = gst_mpeg_packetize_tell (mpeg_parse->packetize);
if (offset > mpeg_parse->byte_offset) {
/* we have reached the wanted offset so emit the signal. */
g_signal_emit (G_OBJECT (mpeg_parse),
gst_mpeg_parse_signals[SIGNAL_REACHED_OFFSET], 0);
}
/* Update index if any. */
if (mpeg_parse->index && GST_INDEX_IS_WRITABLE (mpeg_parse->index)) {
gst_index_add_association (mpeg_parse->index, mpeg_parse->index_id,
GST_ASSOCIATION_FLAG_KEY_UNIT,
GST_FORMAT_BYTES, GST_BUFFER_OFFSET (buffer),
GST_FORMAT_TIME, MPEGTIME_TO_GSTTIME (mpeg_parse->current_scr), 0);
}
/* Update the calculated average bitrate. */
if ((mpeg_parse->current_scr > prev_scr) && (diff < mpeg_parse->max_scr_gap)) {
mpeg_parse->avg_bitrate_time +=
MPEGTIME_TO_GSTTIME (mpeg_parse->current_scr - prev_scr);
mpeg_parse->avg_bitrate_bytes += mpeg_parse->bytes_since_scr;
}
/* Update the bitrate. */
if (mpeg_parse->mux_rate != new_rate) {
if (GST_MPEG_PACKETIZE_IS_MPEG2 (mpeg_parse->packetize)) {
mpeg_parse->mux_rate = new_rate;
} else if (mpeg_parse->avg_bitrate_bytes > MP_MIN_VALID_BSS) {
mpeg_parse->mux_rate =
GST_SECOND * mpeg_parse->avg_bitrate_bytes /
mpeg_parse->avg_bitrate_time;
}
//gst_mpeg_parse_update_streaminfo (mpeg_parse);
GST_LOG_OBJECT (mpeg_parse,
"stream current is %1.3fMbs, calculated over %1.3fkB",
(mpeg_parse->mux_rate * 8) / 1048576.0,
gst_guint64_to_gdouble (mpeg_parse->bytes_since_scr) / 1024.0);
}
if (mpeg_parse->avg_bitrate_bytes) {
GST_LOG_OBJECT (mpeg_parse,
"stream avg is %1.3fMbs, calculated over %1.3fkB",
gst_guint64_to_gdouble (mpeg_parse->avg_bitrate_bytes) * 8 * GST_SECOND
/ gst_guint64_to_gdouble (mpeg_parse->avg_bitrate_time) / 1048576.0,
gst_guint64_to_gdouble (mpeg_parse->avg_bitrate_bytes) / 1024.0);
}
/* Range-check the calculated average bitrate. */
if (mpeg_parse->avg_bitrate_bytes > MP_MAX_VALID_BSS) {
mpeg_parse->avg_bitrate_bytes = 0;
mpeg_parse->avg_bitrate_time = 0;
}
mpeg_parse->bytes_since_scr = 0;
return TRUE;
}
static gboolean
gst_mpeg_parse_event (GstPad * pad, GstEvent * event)
{
gboolean ret;
GstMPEGParse *mpeg_parse = GST_MPEG_PARSE (gst_pad_get_parent (pad));
ret = CLASS (mpeg_parse)->process_event (mpeg_parse, event);
gst_object_unref (mpeg_parse);
return ret;
}
static GstFlowReturn
gst_mpeg_parse_chain (GstPad * pad, GstBuffer * buffer)
{
GstMPEGParse *mpeg_parse = GST_MPEG_PARSE (GST_PAD_PARENT (pad));
GstFlowReturn result;
guint id;
gboolean mpeg2;
GstClockTime time;
guint64 size;
if (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT)) {
GST_DEBUG_OBJECT (mpeg_parse, "buffer with DISCONT flag set");
gst_mpeg_packetize_flush_cache (mpeg_parse->packetize);
}
gst_mpeg_packetize_put (mpeg_parse->packetize, buffer);
buffer = NULL;
do {
result = gst_mpeg_packetize_read (mpeg_parse->packetize, &buffer);
if (result == GST_FLOW_RESEND) {
/* there was not enough data in packetizer cache */
result = GST_FLOW_OK;
break;
}
if (result != GST_FLOW_OK)
break;
id = GST_MPEG_PACKETIZE_ID (mpeg_parse->packetize);
mpeg2 = GST_MPEG_PACKETIZE_IS_MPEG2 (mpeg_parse->packetize);
GST_LOG_OBJECT (mpeg_parse, "have chunk 0x%02X", id);
switch (id) {
case ISO11172_END_START_CODE:
break;
case PACK_START_CODE:
if (CLASS (mpeg_parse)->parse_packhead) {
CLASS (mpeg_parse)->parse_packhead (mpeg_parse, buffer);
}
break;
case SYS_HEADER_START_CODE:
if (CLASS (mpeg_parse)->parse_syshead) {
CLASS (mpeg_parse)->parse_syshead (mpeg_parse, buffer);
}
break;
default:
if (mpeg2 && ((id < 0xBD) || (id > 0xFE))) {
GST_ELEMENT_WARNING (GST_ELEMENT (mpeg_parse),
STREAM, DEMUX, (NULL), ("Unknown stream id 0x%02X", id));
} else {
if (mpeg2) {
if (CLASS (mpeg_parse)->parse_pes) {
result = CLASS (mpeg_parse)->parse_pes (mpeg_parse, buffer);
}
} else {
if (CLASS (mpeg_parse)->parse_packet) {
result = CLASS (mpeg_parse)->parse_packet (mpeg_parse, buffer);
}
}
}
}
/* Don't send data as long as no new SCR is found. */
if (mpeg_parse->current_scr == MP_INVALID_SCR) {
GST_DEBUG_OBJECT (mpeg_parse, "waiting for SCR");
gst_buffer_unref (buffer);
result = GST_FLOW_OK;
break;
}
/* Update the byte count. */
size = GST_BUFFER_SIZE (buffer);
mpeg_parse->bytes_since_scr += size;
/* Make sure the output pad has proper capabilities. */
if (!GST_PAD_CAPS (mpeg_parse->sinkpad)) {
gboolean mpeg2 = GST_MPEG_PACKETIZE_IS_MPEG2 (mpeg_parse->packetize);
if (!gst_pad_set_caps (mpeg_parse->sinkpad,
gst_caps_new_simple ("video/mpeg",
"mpegversion", G_TYPE_INT, (mpeg2 ? 2 : 1),
"systemstream", G_TYPE_BOOLEAN, TRUE,
"parsed", G_TYPE_BOOLEAN, TRUE, NULL)) < 0) {
GST_ELEMENT_ERROR (mpeg_parse, CORE, NEGOTIATION, (NULL), (NULL));
gst_buffer_unref (buffer);
result = GST_FLOW_ERROR;
break;
}
}
/* Send the buffer. */
g_return_val_if_fail (mpeg_parse->current_scr != MP_INVALID_SCR,
GST_FLOW_OK);
time = CLASS (mpeg_parse)->adjust_ts (mpeg_parse,
MPEGTIME_TO_GSTTIME (mpeg_parse->current_scr));
if (CLASS (mpeg_parse)->send_buffer)
result = CLASS (mpeg_parse)->send_buffer (mpeg_parse, buffer, time);
else
gst_buffer_unref (buffer);
buffer = NULL;
/* Calculate the expected next SCR. */
if (mpeg_parse->current_scr != MP_INVALID_SCR) {
guint64 scr, bss, br;
scr = mpeg_parse->current_scr;
bss = mpeg_parse->bytes_since_scr;
if (mpeg_parse->scr_rate != 0)
br = mpeg_parse->scr_rate;
else
br = mpeg_parse->mux_rate;
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 * CLOCK_FREQ) / (CLOCK_FREQ + br);
*/
mpeg_parse->next_scr = scr + (bss * CLOCK_FREQ) / br;
} else {
/* we are interpolating the scr here */
mpeg_parse->next_scr = scr + (bss * CLOCK_FREQ) / br;
}
} else {
/* no bitrate known */
mpeg_parse->next_scr = scr;
}
GST_LOG_OBJECT (mpeg_parse, "size: %" G_GINT64_FORMAT
", total since SCR: %" G_GINT64_FORMAT ", br: %" G_GINT64_FORMAT
", next SCR: %" G_GINT64_FORMAT, size, bss, br, mpeg_parse->next_scr);
}
} while (GST_FLOW_IS_SUCCESS (result));
if (result != GST_FLOW_OK) {
GST_DEBUG_OBJECT (mpeg_parse, "flow: %s", gst_flow_get_name (result));
}
return result;
}
const GstFormat *
gst_mpeg_parse_get_src_formats (GstPad * pad)
{
static const GstFormat formats[] = {
GST_FORMAT_BYTES,
GST_FORMAT_TIME,
0
};
return formats;
}
/*
* Return the bitrate to the nearest byte/sec
*/
static gboolean
gst_mpeg_parse_get_rate (GstMPEGParse * mpeg_parse, gint64 * rate)
{
GstFormat time_format = GST_FORMAT_TIME;
GstFormat bytes_format = GST_FORMAT_BYTES;
gint64 total_time = 0;
gint64 total_bytes = 0;
/* If upstream knows the total time and the total bytes,
* use those to compute an average byterate
*/
if (gst_pad_query_duration (GST_PAD_PEER (mpeg_parse->sinkpad),
&time_format, &total_time)
&&
gst_pad_query_duration (GST_PAD_PEER (mpeg_parse->sinkpad),
&bytes_format, &total_bytes)
&& total_time != 0 && total_bytes != 0) {
/* Use the funny calculation to avoid overflow of 64 bits */
*rate = ((total_bytes * GST_USECOND) / total_time) *
(GST_SECOND / GST_USECOND);
if (*rate > 0) {
return TRUE;
}
}
*rate = 0;
if ((mpeg_parse->first_scr != MP_INVALID_SCR) &&
(mpeg_parse->last_scr != MP_INVALID_SCR) &&
(mpeg_parse->last_scr_pos - mpeg_parse->first_scr_pos > MP_MIN_VALID_BSS)
&& (mpeg_parse->last_scr != mpeg_parse->first_scr)) {
*rate =
GST_SECOND * (mpeg_parse->last_scr_pos -
mpeg_parse->first_scr_pos) / MPEGTIME_TO_GSTTIME (mpeg_parse->last_scr -
mpeg_parse->first_scr);
}
if (*rate == 0 && mpeg_parse->avg_bitrate_time != 0
&& mpeg_parse->avg_bitrate_bytes > MP_MIN_VALID_BSS) {
*rate =
GST_SECOND * mpeg_parse->avg_bitrate_bytes /
mpeg_parse->avg_bitrate_time;
}
if (*rate != 0) {
/*
* check if we need to update scr_rate
*/
if ((mpeg_parse->scr_rate == 0) ||
((gst_guint64_to_gdouble (ABS (mpeg_parse->scr_rate -
*rate)) / gst_guint64_to_gdouble (mpeg_parse->scr_rate))
>= MP_SCR_RATE_HYST)) {
mpeg_parse->scr_rate = *rate;
return TRUE;
}
}
if (mpeg_parse->scr_rate != 0) {
*rate = mpeg_parse->scr_rate;
return TRUE;
}
if (mpeg_parse->mux_rate != 0) {
*rate = mpeg_parse->mux_rate;
return TRUE;
}
return FALSE;
}
static gboolean
gst_mpeg_parse_convert (GstMPEGParse * mpeg_parse, GstFormat src_format,
gint64 src_value, GstFormat * dest_format, gint64 * dest_value)
{
gboolean res = TRUE;
gint64 rate;
if (src_format == *dest_format) {
*dest_value = src_value;
return TRUE;
}
switch (src_format) {
case GST_FORMAT_BYTES:
switch (*dest_format) {
case GST_FORMAT_DEFAULT:
*dest_format = GST_FORMAT_TIME;
case GST_FORMAT_TIME:
if (!gst_mpeg_parse_get_rate (mpeg_parse, &rate)) {
res = FALSE;
} else {
*dest_value = GST_SECOND * src_value / rate;
}
break;
default:
res = FALSE;
break;
}
break;
case GST_FORMAT_TIME:
switch (*dest_format) {
case GST_FORMAT_DEFAULT:
*dest_format = GST_FORMAT_BYTES;
case GST_FORMAT_BYTES:
if (!gst_mpeg_parse_get_rate (mpeg_parse, &rate)) {
res = FALSE;
} else {
*dest_value = src_value * rate / GST_SECOND;
}
break;
case GST_FORMAT_TIME:
break;
default:
res = FALSE;
break;
}
break;
default:
res = FALSE;
break;
}
return res;
}
const GstQueryType *
gst_mpeg_parse_get_src_query_types (GstPad * pad)
{
static const GstQueryType types[] = {
GST_QUERY_DURATION,
GST_QUERY_POSITION,
GST_QUERY_CONVERT,
0
};
return types;
}
gboolean
gst_mpeg_parse_handle_src_query (GstPad * pad, GstQuery * query)
{
gboolean res = TRUE;
GstMPEGParse *mpeg_parse;
GstFormat src_format = GST_FORMAT_UNDEFINED, format;
gint64 src_value = 0, value = -1;
mpeg_parse = GST_MPEG_PARSE (gst_pad_get_parent (pad));
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_DURATION:{
gst_query_parse_duration (query, &format, NULL);
switch (format) {
case GST_FORMAT_DEFAULT:
format = GST_FORMAT_TIME;
/* fallthrough */
case GST_FORMAT_TIME:
/* Try asking upstream if it knows the time - a DVD might
know */
src_format = GST_FORMAT_TIME;
if (gst_pad_query_peer_duration (mpeg_parse->sinkpad,
&src_format, &src_value)) {
res = TRUE;
break;
}
/* Otherwise fallthrough */
default:
src_format = GST_FORMAT_BYTES;
if (!gst_pad_query_peer_duration (mpeg_parse->sinkpad,
&src_format, &src_value)) {
res = FALSE;
goto done;
}
break;
}
/* Convert the value to the desired format. */
if ((res = gst_mpeg_parse_convert (mpeg_parse, src_format, src_value,
&format, &value))) {
gst_query_set_duration (query, format, value);
}
break;
}
case GST_QUERY_POSITION:{
gint64 cur;
gst_query_parse_position (query, &format, NULL);
switch (format) {
case GST_FORMAT_DEFAULT:
format = GST_FORMAT_TIME;
/* Fallthrough. */
default:
src_format = GST_FORMAT_TIME;
if ((mpeg_parse->current_scr == MP_INVALID_SCR) ||
(mpeg_parse->first_scr == MP_INVALID_SCR)) {
res = FALSE;
goto done;
}
cur = (gint64) (mpeg_parse->current_scr) - mpeg_parse->first_scr;
src_value = MPEGTIME_TO_GSTTIME (MAX (0, cur));
break;
}
/* Convert the value to the desired format. */
if ((res = gst_mpeg_parse_convert (mpeg_parse, src_format, src_value,
&format, &value))) {
gst_query_set_position (query, format, value);
}
break;
}
case GST_QUERY_CONVERT:{
gst_query_parse_convert (query, &src_format, &src_value, &format, NULL);
if ((res = gst_mpeg_parse_convert (mpeg_parse, src_format, src_value,
&format, &value))) {
gst_query_set_convert (query, src_format, src_value, format, value);
}
break;
}
default:
res = gst_pad_query_default (pad, query);
break;
}
done:
gst_object_unref (mpeg_parse);
return res;
}
#ifdef FIXME
static gboolean
index_seek (GstPad * pad, GstEvent * event, gint64 * 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);
}
GST_CAT_DEBUG (GST_CAT_SEEK, "%s:%s index %s %" G_GINT64_FORMAT
" -> %" G_GINT64_FORMAT " bytes, scr=%" G_GINT64_FORMAT,
GST_DEBUG_PAD_NAME (pad),
gst_format_get_details (GST_EVENT_SEEK_FORMAT (event))->nick,
GST_EVENT_SEEK_OFFSET (event), *offset, *scr);
return TRUE;
}
return FALSE;
}
#endif
static GstEvent *
normal_seek (GstMPEGParse * mpeg_parse, GstPad * pad, GstEvent * event)
{
GstEvent *upstream = NULL;
gint64 offset;
GstFormat format, conv;
gint64 cur, stop;
gdouble rate;
GstSeekType cur_type, stop_type;
GstSeekFlags flags;
gint64 start_position, end_position;
gst_event_parse_seek (event, &rate, &format, &flags, &cur_type,
&cur, &stop_type, &stop);
offset = cur;
if (offset != -1) {
GST_LOG_OBJECT (mpeg_parse, "starting conversion of cur");
/* Bring the format to time on srcpad. */
conv = GST_FORMAT_TIME;
if (!gst_pad_query_convert (pad, format, offset, &conv, &start_position)) {
goto done;
}
/* And convert to bytes on sinkpad. */
conv = GST_FORMAT_BYTES;
if (!gst_pad_query_convert (mpeg_parse->sinkpad, GST_FORMAT_TIME,
start_position, &conv, &start_position)) {
goto done;
}
GST_INFO_OBJECT (mpeg_parse,
"Finished conversion of cur, BYTES cur : %lld", start_position);
} else {
start_position = -1;
}
offset = stop;
if (offset != -1) {
GST_INFO_OBJECT (mpeg_parse, "starting conversion of stop");
/* Bring the format to time on srcpad. */
conv = GST_FORMAT_TIME;
if (!gst_pad_query_convert (pad, format, offset, &conv, &end_position)) {
goto done;
}
/* And convert to bytes on sinkpad. */
conv = GST_FORMAT_BYTES;
if (!gst_pad_query_convert (mpeg_parse->sinkpad, GST_FORMAT_TIME,
end_position, &conv, &end_position)) {
goto done;
}
GST_INFO_OBJECT (mpeg_parse,
"Finished conversion of stop, BYTES stop : %lld", end_position);
} else {
end_position = -1;
}
upstream = gst_event_new_seek (rate, GST_FORMAT_BYTES, flags,
cur_type, start_position, stop_type, end_position);
done:
return upstream;
}
gboolean
gst_mpeg_parse_handle_src_event (GstPad * pad, GstEvent * event)
{
gboolean res = TRUE;
GstEvent *upstream = NULL;
GstMPEGParse *mpeg_parse = GST_MPEG_PARSE (gst_pad_get_parent (pad));
GST_LOG_OBJECT (mpeg_parse, "got %s event", GST_EVENT_TYPE_NAME (event));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_SEEK:
{
#ifdef FIXME
/* First try to use the index if we have one. */
if (mpeg_parse->index) {
res = index_seek (pad, event, &desired_offset, &expected_scr);
}
#endif
if (upstream == NULL) {
/* Nothing found, try fuzzy seek. */
upstream = normal_seek (mpeg_parse, pad, event);
}
if (!upstream) {
gst_event_unref (event);
res = FALSE;
goto done;
}
res = gst_pad_event_default (pad, upstream);
break;
}
case GST_EVENT_NAVIGATION:
/* Forward navigation events unchanged. */
res = gst_pad_push_event (mpeg_parse->sinkpad, event);
break;
default:
res = gst_pad_event_default (pad, event);
break;
}
done:
gst_object_unref (mpeg_parse);
return res;
}
static GstStateChangeReturn
gst_mpeg_parse_change_state (GstElement * element, GstStateChange transition)
{
GstMPEGParse *mpeg_parse = GST_MPEG_PARSE (element);
GstStateChangeReturn result = GST_STATE_CHANGE_FAILURE;
switch (transition) {
case GST_STATE_CHANGE_READY_TO_PAUSED:
if (!mpeg_parse->packetize) {
mpeg_parse->packetize =
gst_mpeg_packetize_new (GST_MPEG_PACKETIZE_SYSTEM);
}
/* Initialize parser state */
gst_mpeg_parse_reset (mpeg_parse);
break;
default:
break;
}
result = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_READY:
if (mpeg_parse->packetize) {
gst_mpeg_packetize_destroy (mpeg_parse->packetize);
mpeg_parse->packetize = NULL;
}
//gst_caps_replace (&mpeg_parse->streaminfo, NULL);
break;
default:
break;
}
return result;
}
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_MAX_SCR_GAP:
g_value_set_int (value, mpeg_parse->max_scr_gap);
break;
case ARG_BYTE_OFFSET:
g_value_set_uint64 (value, mpeg_parse->byte_offset);
break;
case ARG_TIME_OFFSET:
g_value_set_uint64 (value, mpeg_parse->current_ts);
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_MAX_SCR_GAP:
mpeg_parse->max_scr_gap = g_value_get_int (value);
break;
case ARG_BYTE_OFFSET:
mpeg_parse->byte_offset = g_value_get_uint64 (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 (GstPlugin * plugin)
{
scr_format =
gst_format_register ("scr", "The MPEG system clock reference time");
return gst_element_register (plugin, "mpegparse",
GST_RANK_NONE, GST_TYPE_MPEG_PARSE);
}
Reference in a new issue View git blame Copy permalink