gstreamer/gst/mpegtsdemux/mpegtsparse.c

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/*
* mpegtsparse.c -
* Copyright (C) 2007 Alessandro Decina
*
* Authors:
* Alessandro Decina <alessandro@nnva.org>
* Zaheer Abbas Merali <zaheerabbas at merali dot org>
*
* 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 <stdio.h>
#include <stdlib.h>
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#include <string.h>
#include "mpegtsbase.h"
#include "mpegtsparse.h"
#include "gstmpegdesc.h"
/* latency in mseconds */
#define TS_LATENCY 700
#define TABLE_ID_UNSET 0xFF
#define RUNNING_STATUS_RUNNING 4
GST_DEBUG_CATEGORY_STATIC (mpegts_parse_debug);
#define GST_CAT_DEFAULT mpegts_parse_debug
typedef struct _MpegTSParsePad MpegTSParsePad;
typedef struct
{
MpegTSBaseProgram program;
MpegTSParsePad *tspad;
} MpegTSParseProgram;
struct _MpegTSParsePad
{
GstPad *pad;
/* the program number that the peer wants on this pad */
gint program_number;
MpegTSParseProgram *program;
/* set to FALSE before a push and TRUE after */
gboolean pushed;
/* the return of the latest push */
GstFlowReturn flow_return;
};
static GstStaticPadTemplate src_template =
GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/mpegts, " "systemstream = (boolean) true ")
);
static GstStaticPadTemplate program_template =
GST_STATIC_PAD_TEMPLATE ("program_%u", GST_PAD_SRC,
GST_PAD_REQUEST,
GST_STATIC_CAPS ("video/mpegts, " "systemstream = (boolean) true ")
);
enum
{
ARG_0,
/* FILL ME */
};
static void
mpegts_parse_program_started (MpegTSBase * base, MpegTSBaseProgram * program);
static void
mpegts_parse_program_stopped (MpegTSBase * base, MpegTSBaseProgram * program);
static GstFlowReturn
mpegts_parse_push (MpegTSBase * base, MpegTSPacketizerPacket * packet,
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GstMpegTsSection * section);
static MpegTSParsePad *mpegts_parse_create_tspad (MpegTSParse2 * parse,
const gchar * name);
static void mpegts_parse_destroy_tspad (MpegTSParse2 * parse,
MpegTSParsePad * tspad);
static void mpegts_parse_pad_removed (GstElement * element, GstPad * pad);
static GstPad *mpegts_parse_request_new_pad (GstElement * element,
GstPadTemplate * templ, const gchar * name, const GstCaps * caps);
static void mpegts_parse_release_pad (GstElement * element, GstPad * pad);
static gboolean mpegts_parse_src_pad_query (GstPad * pad, GstObject * parent,
GstQuery * query);
static gboolean push_event (MpegTSBase * base, GstEvent * event);
#define mpegts_parse_parent_class parent_class
G_DEFINE_TYPE (MpegTSParse2, mpegts_parse, GST_TYPE_MPEGTS_BASE);
static void mpegts_parse_reset (MpegTSBase * base);
static GstFlowReturn mpegts_parse_input_done (MpegTSBase * base,
GstBuffer * buffer);
static void
mpegts_parse_class_init (MpegTSParse2Class * klass)
{
GstElementClass *element_class;
MpegTSBaseClass *ts_class;
element_class = GST_ELEMENT_CLASS (klass);
element_class->pad_removed = mpegts_parse_pad_removed;
element_class->request_new_pad = mpegts_parse_request_new_pad;
element_class->release_pad = mpegts_parse_release_pad;
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&src_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&program_template));
gst_element_class_set_static_metadata (element_class,
"MPEG transport stream parser", "Codec/Parser",
"Parses MPEG2 transport streams",
"Alessandro Decina <alessandro@nnva.org>, "
"Zaheer Abbas Merali <zaheerabbas at merali dot org>");
ts_class = GST_MPEGTS_BASE_CLASS (klass);
ts_class->push = GST_DEBUG_FUNCPTR (mpegts_parse_push);
ts_class->push_event = GST_DEBUG_FUNCPTR (push_event);
ts_class->program_started = GST_DEBUG_FUNCPTR (mpegts_parse_program_started);
ts_class->program_stopped = GST_DEBUG_FUNCPTR (mpegts_parse_program_stopped);
ts_class->reset = GST_DEBUG_FUNCPTR (mpegts_parse_reset);
ts_class->input_done = GST_DEBUG_FUNCPTR (mpegts_parse_input_done);
}
static void
mpegts_parse_init (MpegTSParse2 * parse)
{
MpegTSBase *base = (MpegTSBase *) parse;
base->program_size = sizeof (MpegTSParseProgram);
/* We will only need to handle data/section if we have request pads */
base->push_data = FALSE;
base->push_section = FALSE;
parse->srcpad = gst_pad_new_from_static_template (&src_template, "src");
parse->first = TRUE;
gst_element_add_pad (GST_ELEMENT (parse), parse->srcpad);
}
static void
mpegts_parse_reset (MpegTSBase * base)
{
/* Set the various know PIDs we are interested in */
/* CAT */
MPEGTS_BIT_SET (base->known_psi, 1);
/* NIT, ST */
MPEGTS_BIT_SET (base->known_psi, 0x10);
/* SDT, BAT, ST */
MPEGTS_BIT_SET (base->known_psi, 0x11);
/* EIT, ST, CIT (TS 102 323) */
MPEGTS_BIT_SET (base->known_psi, 0x12);
/* RST, ST */
MPEGTS_BIT_SET (base->known_psi, 0x13);
/* RNT (TS 102 323) */
MPEGTS_BIT_SET (base->known_psi, 0x16);
/* inband signalling */
MPEGTS_BIT_SET (base->known_psi, 0x1c);
/* measurement */
MPEGTS_BIT_SET (base->known_psi, 0x1d);
/* DIT */
MPEGTS_BIT_SET (base->known_psi, 0x1e);
/* SIT */
MPEGTS_BIT_SET (base->known_psi, 0x1f);
GST_MPEGTS_PARSE (base)->first = TRUE;
}
static void
prepare_src_pad (MpegTSBase * base, MpegTSParse2 * parse)
{
if (base->packetizer->packet_size) {
gchar *stream_id;
GstCaps *caps;
stream_id =
gst_pad_create_stream_id (parse->srcpad, GST_ELEMENT_CAST (base),
"multi-program");
gst_pad_push_event (parse->srcpad, gst_event_new_stream_start (stream_id));
g_free (stream_id);
caps = gst_caps_new_simple ("video/mpegts",
"systemstream", G_TYPE_BOOLEAN, TRUE,
"packetsize", G_TYPE_INT, base->packetizer->packet_size, NULL);
gst_pad_set_caps (parse->srcpad, caps);
gst_caps_unref (caps);
gst_pad_push_event (parse->srcpad, gst_event_new_segment (&base->segment));
parse->first = FALSE;
}
}
static gboolean
push_event (MpegTSBase * base, GstEvent * event)
{
MpegTSParse2 *parse = (MpegTSParse2 *) base;
GList *tmp;
if (G_UNLIKELY (parse->first)) {
/* We will send the segment when really starting */
if (G_UNLIKELY (GST_EVENT_TYPE (event) == GST_EVENT_SEGMENT)) {
gst_event_unref (event);
return TRUE;
}
prepare_src_pad (base, parse);
}
for (tmp = parse->srcpads; tmp; tmp = tmp->next) {
GstPad *pad = (GstPad *) tmp->data;
if (pad) {
gst_event_ref (event);
gst_pad_push_event (pad, event);
}
}
gst_pad_push_event (parse->srcpad, event);
return TRUE;
}
static MpegTSParsePad *
mpegts_parse_create_tspad (MpegTSParse2 * parse, const gchar * pad_name)
{
GstPad *pad;
MpegTSParsePad *tspad;
pad = gst_pad_new_from_static_template (&program_template, pad_name);
gst_pad_set_query_function (pad,
GST_DEBUG_FUNCPTR (mpegts_parse_src_pad_query));
/* create our wrapper */
tspad = g_new0 (MpegTSParsePad, 1);
tspad->pad = pad;
tspad->program_number = -1;
tspad->program = NULL;
tspad->pushed = FALSE;
tspad->flow_return = GST_FLOW_NOT_LINKED;
gst_pad_set_element_private (pad, tspad);
return tspad;
}
static void
mpegts_parse_destroy_tspad (MpegTSParse2 * parse, MpegTSParsePad * tspad)
{
/* free the wrapper */
g_free (tspad);
}
static void
mpegts_parse_pad_removed (GstElement * element, GstPad * pad)
{
MpegTSParsePad *tspad;
MpegTSBase *base = (MpegTSBase *) element;
MpegTSParse2 *parse = GST_MPEGTS_PARSE (element);
if (gst_pad_get_direction (pad) == GST_PAD_SINK)
return;
tspad = (MpegTSParsePad *) gst_pad_get_element_private (pad);
if (tspad) {
mpegts_parse_destroy_tspad (parse, tspad);
parse->srcpads = g_list_remove_all (parse->srcpads, pad);
}
if (parse->srcpads == NULL) {
base->push_data = FALSE;
base->push_section = FALSE;
}
if (GST_ELEMENT_CLASS (parent_class)->pad_removed)
GST_ELEMENT_CLASS (parent_class)->pad_removed (element, pad);
}
static GstPad *
mpegts_parse_request_new_pad (GstElement * element, GstPadTemplate * template,
const gchar * padname, const GstCaps * caps)
{
MpegTSBase *base = (MpegTSBase *) element;
MpegTSParse2 *parse;
MpegTSParsePad *tspad;
MpegTSParseProgram *parseprogram;
GstPad *pad;
gint program_num = -1;
gchar *stream_id;
g_return_val_if_fail (template != NULL, NULL);
g_return_val_if_fail (GST_IS_MPEGTS_PARSE (element), NULL);
g_return_val_if_fail (padname != NULL, NULL);
sscanf (padname + 8, "%d", &program_num);
GST_DEBUG_OBJECT (element, "padname:%s, program:%d", padname, program_num);
parse = GST_MPEGTS_PARSE (element);
tspad = mpegts_parse_create_tspad (parse, padname);
tspad->program_number = program_num;
/* Find if the program is already active */
parseprogram =
(MpegTSParseProgram *) mpegts_base_get_program (GST_MPEGTS_BASE (parse),
program_num);
if (parseprogram) {
tspad->program = parseprogram;
parseprogram->tspad = tspad;
}
pad = tspad->pad;
parse->srcpads = g_list_append (parse->srcpads, pad);
base->push_data = TRUE;
base->push_section = TRUE;
gst_pad_set_active (pad, TRUE);
stream_id = gst_pad_create_stream_id (pad, element, padname + 8);
gst_pad_push_event (pad, gst_event_new_stream_start (stream_id));
g_free (stream_id);
gst_element_add_pad (element, pad);
return pad;
}
static void
mpegts_parse_release_pad (GstElement * element, GstPad * pad)
{
gst_pad_set_active (pad, FALSE);
/* we do the cleanup in GstElement::pad-removed */
gst_element_remove_pad (element, pad);
}
static GstFlowReturn
mpegts_parse_tspad_push_section (MpegTSParse2 * parse, MpegTSParsePad * tspad,
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GstMpegTsSection * section, MpegTSPacketizerPacket * packet)
{
GstFlowReturn ret = GST_FLOW_OK;
gboolean to_push = TRUE;
if (tspad->program_number != -1) {
if (tspad->program) {
/* we push all sections to all pads except PMTs which we
* only push to pads meant to receive that program number */
if (section->table_id == 0x02) {
/* PMT */
if (section->subtable_extension != tspad->program_number)
to_push = FALSE;
}
} else {
/* there's a program filter on the pad but the PMT for the program has not
* been parsed yet, ignore the pad until we get a PMT */
to_push = FALSE;
}
}
GST_DEBUG_OBJECT (parse,
"pushing section: %d program number: %d table_id: %d", to_push,
tspad->program_number, section->table_id);
if (to_push) {
GstBuffer *buf =
gst_buffer_new_and_alloc (packet->data_end - packet->data_start);
gst_buffer_fill (buf, 0, packet->data_start,
packet->data_end - packet->data_start);
ret = gst_pad_push (tspad->pad, buf);
}
return ret;
}
static GstFlowReturn
mpegts_parse_tspad_push (MpegTSParse2 * parse, MpegTSParsePad * tspad,
MpegTSPacketizerPacket * packet)
{
GstFlowReturn ret = GST_FLOW_OK;
MpegTSBaseStream **pad_pids = NULL;
if (tspad->program_number != -1) {
if (tspad->program) {
MpegTSBaseProgram *bp = (MpegTSBaseProgram *) tspad->program;
pad_pids = bp->streams;
} else {
/* there's a program filter on the pad but the PMT for the program has not
* been parsed yet, ignore the pad until we get a PMT */
goto out;
}
}
if (pad_pids == NULL || pad_pids[packet->pid]) {
GstBuffer *buf =
gst_buffer_new_and_alloc (packet->data_end - packet->data_start);
gst_buffer_fill (buf, 0, packet->data_start,
packet->data_end - packet->data_start);
/* push if there's no filter or if the pid is in the filter */
ret = gst_pad_push (tspad->pad, buf);
}
out:
return ret;
}
static void
pad_clear_for_push (GstPad * pad, MpegTSParse2 * parse)
{
MpegTSParsePad *tspad = (MpegTSParsePad *) gst_pad_get_element_private (pad);
tspad->flow_return = GST_FLOW_NOT_LINKED;
tspad->pushed = FALSE;
}
static GstFlowReturn
mpegts_parse_push (MpegTSBase * base, MpegTSPacketizerPacket * packet,
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GstMpegTsSection * section)
{
MpegTSParse2 *parse = (MpegTSParse2 *) base;
guint32 pads_cookie;
gboolean done = FALSE;
GstPad *pad = NULL;
MpegTSParsePad *tspad;
GstFlowReturn ret;
GList *srcpads;
GST_OBJECT_LOCK (parse);
srcpads = parse->srcpads;
/* clear tspad->pushed on pads */
g_list_foreach (srcpads, (GFunc) pad_clear_for_push, parse);
if (srcpads)
ret = GST_FLOW_NOT_LINKED;
else
ret = GST_FLOW_OK;
/* Get cookie and source pads list */
pads_cookie = GST_ELEMENT_CAST (parse)->pads_cookie;
if (G_LIKELY (srcpads)) {
pad = GST_PAD_CAST (srcpads->data);
g_object_ref (pad);
}
GST_OBJECT_UNLOCK (parse);
while (pad && !done) {
tspad = gst_pad_get_element_private (pad);
if (G_LIKELY (!tspad->pushed)) {
if (section) {
tspad->flow_return =
mpegts_parse_tspad_push_section (parse, tspad, section, packet);
} else {
tspad->flow_return = mpegts_parse_tspad_push (parse, tspad, packet);
}
tspad->pushed = TRUE;
if (G_UNLIKELY (tspad->flow_return != GST_FLOW_OK
&& tspad->flow_return != GST_FLOW_NOT_LINKED)) {
/* return the error upstream */
ret = tspad->flow_return;
done = TRUE;
}
}
if (ret == GST_FLOW_NOT_LINKED)
ret = tspad->flow_return;
g_object_unref (pad);
if (G_UNLIKELY (!done)) {
GST_OBJECT_LOCK (parse);
if (G_UNLIKELY (pads_cookie != GST_ELEMENT_CAST (parse)->pads_cookie)) {
/* resync */
GST_DEBUG ("resync");
pads_cookie = GST_ELEMENT_CAST (parse)->pads_cookie;
srcpads = parse->srcpads;
} else {
GST_DEBUG ("getting next pad");
/* Get next pad */
srcpads = g_list_next (srcpads);
}
if (srcpads) {
pad = GST_PAD_CAST (srcpads->data);
g_object_ref (pad);
} else
done = TRUE;
GST_OBJECT_UNLOCK (parse);
}
}
return ret;
}
static GstFlowReturn
mpegts_parse_input_done (MpegTSBase * base, GstBuffer * buffer)
{
MpegTSParse2 *parse = GST_MPEGTS_PARSE (base);
if (G_UNLIKELY (parse->first))
prepare_src_pad (base, parse);
return gst_pad_push (parse->srcpad, buffer);
}
static MpegTSParsePad *
find_pad_for_program (MpegTSParse2 * parse, guint program_number)
{
GList *tmp;
for (tmp = parse->srcpads; tmp; tmp = tmp->next) {
MpegTSParsePad *tspad = gst_pad_get_element_private ((GstPad *) tmp->data);
if (tspad->program_number == program_number)
return tspad;
}
return NULL;
}
static void
mpegts_parse_program_started (MpegTSBase * base, MpegTSBaseProgram * program)
{
MpegTSParse2 *parse = GST_MPEGTS_PARSE (base);
MpegTSParseProgram *parseprogram = (MpegTSParseProgram *) program;
MpegTSParsePad *tspad;
/* If we have a request pad for that program, activate it */
tspad = find_pad_for_program (parse, program->program_number);
if (tspad) {
tspad->program = parseprogram;
parseprogram->tspad = tspad;
}
}
static void
mpegts_parse_program_stopped (MpegTSBase * base, MpegTSBaseProgram * program)
{
MpegTSParse2 *parse = GST_MPEGTS_PARSE (base);
MpegTSParseProgram *parseprogram = (MpegTSParseProgram *) program;
MpegTSParsePad *tspad;
/* If we have a request pad for that program, activate it */
tspad = find_pad_for_program (parse, program->program_number);
if (tspad) {
tspad->program = NULL;
parseprogram->tspad = NULL;
}
}
static gboolean
mpegts_parse_src_pad_query (GstPad * pad, GstObject * parent, GstQuery * query)
{
MpegTSParse2 *parse = GST_MPEGTS_PARSE (parent);
gboolean res;
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_LATENCY:
{
if ((res = gst_pad_peer_query (((MpegTSBase *) parse)->sinkpad, query))) {
gboolean is_live;
GstClockTime min_latency, max_latency;
gst_query_parse_latency (query, &is_live, &min_latency, &max_latency);
if (is_live) {
min_latency += TS_LATENCY * GST_MSECOND;
if (max_latency != GST_CLOCK_TIME_NONE)
max_latency += TS_LATENCY * GST_MSECOND;
}
gst_query_set_latency (query, is_live, min_latency, max_latency);
}
break;
}
default:
res = gst_pad_query_default (pad, parent, query);
}
return res;
}
gboolean
gst_mpegtsparse_plugin_init (GstPlugin * plugin)
{
GST_DEBUG_CATEGORY_INIT (mpegts_parse_debug, "tsparse", 0,
"MPEG transport stream parser");
return gst_element_register (plugin, "tsparse",
GST_RANK_NONE, GST_TYPE_MPEGTS_PARSE);
}