gstreamer/gst/mpegtsdemux/mpegtsparse.c

996 lines
30 KiB
C

/*
* 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>
#include <string.h>
#include "mpegtsbase.h"
#include "mpegtsparse.h"
#include "gstmpegdesc.h"
/* latency in mseconds is maximum 100 ms between PCR */
#define TS_LATENCY 100
#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
{
PROP_0,
PROP_SET_TIMESTAMPS,
PROP_SMOOTHING_LATENCY,
PROP_PCR_PID,
/* FILL ME */
};
static void mpegts_parse_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void mpegts_parse_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
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,
GstMpegtsSection * section);
static void mpegts_parse_inspect_packet (MpegTSBase * base,
MpegTSPacketizerPacket * packet);
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 GstFlowReturn
drain_pending_buffers (MpegTSParse2 * parse, gboolean drain_all);
static void
mpegts_parse_dispose (GObject * object)
{
MpegTSParse2 *parse = (MpegTSParse2 *) object;
gst_flow_combiner_free (parse->flowcombiner);
GST_CALL_PARENT (G_OBJECT_CLASS, dispose, (object));
}
static void
mpegts_parse_class_init (MpegTSParse2Class * klass)
{
GObjectClass *gobject_class = (GObjectClass *) (klass);
GstElementClass *element_class;
MpegTSBaseClass *ts_class;
gobject_class->set_property = mpegts_parse_set_property;
gobject_class->get_property = mpegts_parse_get_property;
gobject_class->dispose = mpegts_parse_dispose;
g_object_class_install_property (gobject_class, PROP_SET_TIMESTAMPS,
g_param_spec_boolean ("set-timestamps",
"Timestamp (or re-timestamp) the output stream",
"If set, timestamps will be set on the output buffers using "
"PCRs and smoothed over the smoothing-latency period", FALSE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_SMOOTHING_LATENCY,
g_param_spec_uint ("smoothing-latency", "Smoothing Latency",
"Additional latency in microseconds for smoothing jitter in input timestamps on live capture",
0, G_MAXUINT, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_PCR_PID,
g_param_spec_int ("pcr-pid", "PID containing PCR",
"Set the PID to use for PCR values (-1 for auto)",
-1, G_MAXINT, -1, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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_static_pad_template (element_class, &src_template);
gst_element_class_add_static_pad_template (element_class, &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);
ts_class->inspect_packet = GST_DEBUG_FUNCPTR (mpegts_parse_inspect_packet);
}
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->user_pcr_pid = parse->pcr_pid = -1;
parse->flowcombiner = gst_flow_combiner_new ();
parse->srcpad = gst_pad_new_from_static_template (&src_template, "src");
gst_flow_combiner_add_pad (parse->flowcombiner, parse->srcpad);
parse->first = TRUE;
gst_pad_set_query_function (parse->srcpad,
GST_DEBUG_FUNCPTR (mpegts_parse_src_pad_query));
gst_element_add_pad (GST_ELEMENT (parse), parse->srcpad);
parse->have_group_id = FALSE;
parse->group_id = G_MAXUINT;
}
static void
mpegts_parse_reset (MpegTSBase * base)
{
MpegTSParse2 *parse = (MpegTSParse2 *) 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);
parse->first = TRUE;
parse->have_group_id = FALSE;
parse->group_id = G_MAXUINT;
g_list_free_full (parse->pending_buffers, (GDestroyNotify) gst_buffer_unref);
parse->pending_buffers = NULL;
parse->current_pcr = GST_CLOCK_TIME_NONE;
parse->previous_pcr = GST_CLOCK_TIME_NONE;
parse->base_pcr = GST_CLOCK_TIME_NONE;
parse->bytes_since_pcr = 0;
parse->pcr_pid = parse->user_pcr_pid;
parse->ts_offset = 0;
}
static void
mpegts_parse_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
MpegTSParse2 *parse = (MpegTSParse2 *) object;
switch (prop_id) {
case PROP_SET_TIMESTAMPS:
parse->set_timestamps = g_value_get_boolean (value);
break;
case PROP_SMOOTHING_LATENCY:
parse->smoothing_latency = GST_USECOND * g_value_get_uint (value);
mpegts_packetizer_set_pcr_discont_threshold (GST_MPEGTS_BASE
(parse)->packetizer, parse->smoothing_latency);
break;
case PROP_PCR_PID:
parse->pcr_pid = parse->user_pcr_pid = g_value_get_int (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
}
}
static void
mpegts_parse_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
MpegTSParse2 *parse = (MpegTSParse2 *) object;
switch (prop_id) {
case PROP_SET_TIMESTAMPS:
g_value_set_boolean (value, parse->set_timestamps);
break;
case PROP_SMOOTHING_LATENCY:
g_value_set_uint (value, parse->smoothing_latency / GST_USECOND);
break;
case PROP_PCR_PID:
g_value_set_int (value, parse->pcr_pid);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
}
}
static gboolean
prepare_src_pad (MpegTSBase * base, MpegTSParse2 * parse)
{
GstEvent *event;
gchar *stream_id;
GstCaps *caps;
if (!parse->first)
return TRUE;
/* If there's no packet_size yet, we can't set caps yet */
if (G_UNLIKELY (base->packetizer->packet_size == 0))
return FALSE;
stream_id =
gst_pad_create_stream_id (parse->srcpad, GST_ELEMENT_CAST (base),
"multi-program");
event =
gst_pad_get_sticky_event (parse->parent.sinkpad, GST_EVENT_STREAM_START,
0);
if (event) {
if (gst_event_parse_group_id (event, &parse->group_id))
parse->have_group_id = TRUE;
else
parse->have_group_id = FALSE;
gst_event_unref (event);
} else if (!parse->have_group_id) {
parse->have_group_id = TRUE;
parse->group_id = gst_util_group_id_next ();
}
event = gst_event_new_stream_start (stream_id);
if (parse->have_group_id)
gst_event_set_group_id (event, parse->group_id);
gst_pad_push_event (parse->srcpad, event);
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);
/* If setting output timestamps, ensure that the output segment is TIME */
if (parse->set_timestamps == FALSE || base->segment.format == GST_FORMAT_TIME)
gst_pad_push_event (parse->srcpad, gst_event_new_segment (&base->segment));
else {
GstSegment seg;
gst_segment_init (&seg, GST_FORMAT_TIME);
GST_DEBUG_OBJECT (parse,
"Generating time output segment %" GST_SEGMENT_FORMAT, &seg);
gst_pad_push_event (parse->srcpad, gst_event_new_segment (&seg));
}
parse->first = FALSE;
return TRUE;
}
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);
}
if (G_UNLIKELY (GST_EVENT_TYPE (event) == GST_EVENT_EOS))
drain_pending_buffers (parse, TRUE);
if (G_UNLIKELY (GST_EVENT_TYPE (event) == GST_EVENT_SEGMENT))
parse->ts_offset = 0;
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);
gst_flow_combiner_add_pad (parse->flowcombiner, pad);
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;
GstEvent *event;
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);
event =
gst_pad_get_sticky_event (parse->parent.sinkpad, GST_EVENT_STREAM_START,
0);
if (event) {
if (gst_event_parse_group_id (event, &parse->group_id))
parse->have_group_id = TRUE;
else
parse->have_group_id = FALSE;
gst_event_unref (event);
} else if (!parse->have_group_id) {
parse->have_group_id = TRUE;
parse->group_id = gst_util_group_id_next ();
}
event = gst_event_new_stream_start (stream_id);
if (parse->have_group_id)
gst_event_set_group_id (event, parse->group_id);
gst_pad_push_event (pad, event);
g_free (stream_id);
gst_element_add_pad (element, pad);
return pad;
}
static void
mpegts_parse_release_pad (GstElement * element, GstPad * pad)
{
MpegTSParse2 *parse = (MpegTSParse2 *) element;
gst_pad_set_active (pad, FALSE);
/* we do the cleanup in GstElement::pad-removed */
gst_flow_combiner_remove_pad (parse->flowcombiner, pad);
gst_element_remove_pad (element, pad);
}
static GstFlowReturn
mpegts_parse_tspad_push_section (MpegTSParse2 * parse, MpegTSParsePad * tspad,
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 if (section->table_id != 0x00) {
/* 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.
* But we always allow PAT to go through */
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);
ret = gst_flow_combiner_update_flow (parse->flowcombiner, ret);
}
GST_LOG_OBJECT (parse, "Returning %s", gst_flow_get_name (ret));
return ret;
}
static GstFlowReturn
mpegts_parse_tspad_push (MpegTSParse2 * parse, MpegTSParsePad * tspad,
MpegTSPacketizerPacket * packet)
{
GstFlowReturn ret = GST_FLOW_OK;
MpegTSBaseProgram *bp = NULL;
if (tspad->program_number != -1) {
if (tspad->program)
bp = (MpegTSBaseProgram *) tspad->program;
else
bp = mpegts_base_get_program ((MpegTSBase *) parse,
tspad->program_number);
}
if (bp) {
if (packet->pid == bp->pmt_pid || bp->streams == NULL
|| bp->streams[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);
ret = gst_flow_combiner_update_flow (parse->flowcombiner, ret);
}
}
GST_DEBUG_OBJECT (parse, "Returning %s", gst_flow_get_name (ret));
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,
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 void
mpegts_parse_inspect_packet (MpegTSBase * base, MpegTSPacketizerPacket * packet)
{
MpegTSParse2 *parse = GST_MPEGTS_PARSE (base);
GST_LOG ("pid 0x%04x pusi:%d, afc:%d, cont:%d, payload:%p PCR %"
G_GUINT64_FORMAT, packet->pid, packet->payload_unit_start_indicator,
packet->scram_afc_cc & 0x30,
FLAGS_CONTINUITY_COUNTER (packet->scram_afc_cc), packet->payload,
packet->pcr);
/* Store the PCR if desired */
if (parse->current_pcr == GST_CLOCK_TIME_NONE &&
packet->afc_flags & MPEGTS_AFC_PCR_FLAG) {
/* Take this as the pcr_pid if set to auto-select */
if (parse->pcr_pid == -1)
parse->pcr_pid = packet->pid;
/* Check the PCR-PID matches the program we want for multiple programs */
if (parse->pcr_pid == packet->pid) {
parse->current_pcr = PCRTIME_TO_GSTTIME (packet->pcr);
if (parse->base_pcr == GST_CLOCK_TIME_NONE) {
parse->base_pcr = parse->current_pcr;
}
}
}
}
static GstClockTime
get_pending_timestamp_diff (MpegTSParse2 * parse)
{
GList *l;
GstClockTime first_ts, last_ts;
if (parse->pending_buffers == NULL)
return GST_CLOCK_TIME_NONE;
l = g_list_last (parse->pending_buffers);
first_ts = GST_BUFFER_PTS (l->data);
if (first_ts == GST_CLOCK_TIME_NONE)
return GST_CLOCK_TIME_NONE;
l = g_list_first (parse->pending_buffers);
last_ts = GST_BUFFER_PTS (l->data);
if (last_ts == GST_CLOCK_TIME_NONE)
return GST_CLOCK_TIME_NONE;
return last_ts - first_ts;
}
static GstFlowReturn
drain_pending_buffers (MpegTSParse2 * parse, gboolean drain_all)
{
MpegTSBase *base = (MpegTSBase *) (parse);
GstFlowReturn ret = GST_FLOW_OK;
GstClockTime start_ts;
GstClockTime pcr = GST_CLOCK_TIME_NONE;
GstClockTime pcr_diff = 0;
gsize pcr_bytes, bytes_since_pcr, pos;
GstBuffer *buffer;
GList *l, *end = NULL;
if (parse->pending_buffers == NULL)
return GST_FLOW_OK; /* Nothing to push */
/*
* There are 4 cases:
* 1 We get a buffer with no PCR -> it's the head of the list
* -> Do nothing, unless it's EOS
* 2 We get a buffer with a PCR, it's the first PCR we've seen, and belongs
* to the buffer at the head of the list
* -> Push any buffers in the list except the head,
* using a smoothing of their timestamps to land at the PCR
* -> store new PCR as the previous PCR, bytes_since_pcr = sizeof (buffer);
* 3 It's EOS (drain_all == TRUE, current_pcr == NONE)
* -> Push any buffers in the list using a smoothing of their timestamps
* starting at the previous PCR or first TS
* 4 We get a buffer with a PCR, and have a previous PCR
* -> If distance > smoothing_latency,
* output buffers except the last in the pending queue using
* piecewise-linear timestamps
* -> store new PCR as the previous PCR, bytes_since_pcr = sizeof (buffer);
*/
/* Case 1 */
if (!GST_CLOCK_TIME_IS_VALID (parse->current_pcr) && !drain_all)
return GST_FLOW_OK;
if (GST_CLOCK_TIME_IS_VALID (parse->current_pcr)) {
pcr = mpegts_packetizer_pts_to_ts (base->packetizer,
parse->current_pcr, parse->pcr_pid);
parse->current_pcr = GST_CLOCK_TIME_NONE;
}
/* The bytes of the last buffer are after the PCR */
buffer = GST_BUFFER (g_list_nth_data (parse->pending_buffers, 0));
bytes_since_pcr = gst_buffer_get_size (buffer);
pcr_bytes = parse->bytes_since_pcr - bytes_since_pcr;
if (!drain_all)
end = g_list_first (parse->pending_buffers);
/* Case 2 */
if (!GST_CLOCK_TIME_IS_VALID (parse->previous_pcr)) {
pcr_diff = get_pending_timestamp_diff (parse);
/* Calculate the start_ts that ends at the end timestamp */
start_ts = GST_CLOCK_TIME_NONE;
if (end) {
start_ts = GST_BUFFER_PTS (GST_BUFFER (end->data));
if (start_ts > pcr_diff)
start_ts -= pcr_diff;
}
} else if (drain_all) { /* Case 3 */
start_ts = parse->previous_pcr;
pcr_diff = get_pending_timestamp_diff (parse);
} else { /* Case 4 */
start_ts = parse->previous_pcr;
if (GST_CLOCK_TIME_IS_VALID (pcr) && pcr > start_ts)
pcr_diff = GST_CLOCK_DIFF (start_ts, pcr);
/* Make sure PCR observations are sufficiently far apart */
if (drain_all == FALSE && pcr_diff < parse->smoothing_latency)
return GST_FLOW_OK;
}
GST_INFO_OBJECT (parse, "Pushing buffers - startTS %" GST_TIME_FORMAT
" duration %" GST_TIME_FORMAT " %" G_GSIZE_FORMAT " bytes",
GST_TIME_ARGS (start_ts), GST_TIME_ARGS (pcr_diff), pcr_bytes);
/* Now, push buffers out pacing timestamps over pcr_diff time and pcr_bytes */
pos = 0;
l = g_list_last (parse->pending_buffers);
while (l != end) {
GList *p;
GstClockTime out_ts = start_ts;
buffer = gst_buffer_make_writable (GST_BUFFER (l->data));
if (out_ts != GST_CLOCK_TIME_NONE && pcr_diff != GST_CLOCK_TIME_NONE &&
pcr_bytes && pos)
out_ts += gst_util_uint64_scale (pcr_diff, pos, pcr_bytes);
pos += gst_buffer_get_size (buffer);
GST_DEBUG_OBJECT (parse,
"InputTS %" GST_TIME_FORMAT " out %" GST_TIME_FORMAT,
GST_TIME_ARGS (GST_BUFFER_PTS (buffer)), GST_TIME_ARGS (out_ts));
GST_BUFFER_PTS (buffer) = out_ts + parse->ts_offset;
GST_BUFFER_DTS (buffer) = out_ts + parse->ts_offset;
if (ret == GST_FLOW_OK) {
ret = gst_pad_push (parse->srcpad, buffer);
ret = gst_flow_combiner_update_flow (parse->flowcombiner, ret);
} else
gst_buffer_unref (buffer);
/* Free this list node and move to the next */
p = g_list_previous (l);
parse->pending_buffers = g_list_delete_link (parse->pending_buffers, l);
l = p;
}
parse->pending_buffers = end;
parse->bytes_since_pcr = bytes_since_pcr;
parse->previous_pcr = pcr;
return ret;
}
static GstFlowReturn
mpegts_parse_input_done (MpegTSBase * base, GstBuffer * buffer)
{
MpegTSParse2 *parse = GST_MPEGTS_PARSE (base);
GstFlowReturn ret = GST_FLOW_OK;
GST_LOG_OBJECT (parse, "Received buffer %" GST_PTR_FORMAT, buffer);
if (parse->current_pcr != GST_CLOCK_TIME_NONE) {
GST_DEBUG_OBJECT (parse,
"InputTS %" GST_TIME_FORMAT " PCR %" GST_TIME_FORMAT,
GST_TIME_ARGS (GST_BUFFER_PTS (buffer)),
GST_TIME_ARGS (mpegts_packetizer_pts_to_ts (base->packetizer,
parse->current_pcr, parse->pcr_pid)));
}
if (parse->set_timestamps || parse->first) {
parse->pending_buffers = g_list_prepend (parse->pending_buffers, buffer);
parse->bytes_since_pcr += gst_buffer_get_size (buffer);
buffer = NULL;
}
if (!prepare_src_pad (base, parse))
return GST_FLOW_OK;
if (parse->pending_buffers != NULL) {
/* Don't keep pending_buffers if not setting output timestamps */
gboolean drain_all = (parse->set_timestamps == FALSE);
ret = drain_pending_buffers (parse, drain_all);
if (ret != GST_FLOW_OK) {
if (buffer)
gst_buffer_unref (buffer);
return ret;
}
}
if (buffer != NULL) {
ret = gst_pad_push (parse->srcpad, buffer);
ret = gst_flow_combiner_update_flow (parse->flowcombiner, ret);
}
return ret;
}
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;
}
parse->pcr_pid = -1;
parse->ts_offset += parse->current_pcr - parse->base_pcr;
parse->base_pcr = GST_CLOCK_TIME_NONE;
}
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) {
GstClockTime extra_latency = TS_LATENCY * GST_MSECOND;
if (parse->set_timestamps) {
extra_latency = MAX (extra_latency, parse->smoothing_latency);
}
min_latency += extra_latency;
if (max_latency != GST_CLOCK_TIME_NONE)
max_latency += extra_latency;
}
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);
}