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gstreamer/gst/mpegtsparse/mpegtsparse.c
Zaheer Abbas Merali 8aea40af0b Move of mpegtsparse to mpegdemux 
Original commit message from CVS:
Move of mpegtsparse to mpegdemux
2008-10-08 15:22:12 +00:00

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/*
* mpegtsparse.c -
* Copyright (C) 2007 Alessandro Decina
*
* Authors:
* Alessandro Decina <alessandro@nnva.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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdlib.h>
#include "mpegtsparse.h"
#include "gstmpegdesc.h"
/* latency in mseconds */
#define TS_LATENCY 700
#define TABLE_ID_UNSET 0xFF
GST_DEBUG_CATEGORY_STATIC (mpegts_parse_debug);
#define GST_CAT_DEFAULT mpegts_parse_debug
typedef struct _MpegTSParsePad MpegTSParsePad;
typedef struct
{
guint16 pid;
guint8 stream_type;
} MpegTSParseStream;
typedef struct
{
gint program_number;
guint16 pmt_pid;
guint16 pcr_pid;
GstStructure *pmt_info;
GHashTable *streams;
gint patcount;
gint selected;
gboolean active;
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 GstElementDetails mpegts_parse_details =
GST_ELEMENT_DETAILS ("MPEG transport stream parser",
"Codec/Parser",
"Parses MPEG2 transport streams",
"Alessandro Decina <alessandro@nnva.org>");
static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/mpegts, " "systemstream = (boolean) true ")
);
static GstStaticPadTemplate src_template =
GST_STATIC_PAD_TEMPLATE ("src%d", GST_PAD_SRC,
GST_PAD_REQUEST,
GST_STATIC_CAPS ("video/mpegts, " "systemstream = (boolean) true ")
);
static GstStaticPadTemplate program_template =
GST_STATIC_PAD_TEMPLATE ("program_%d", GST_PAD_SRC,
GST_PAD_SOMETIMES,
GST_STATIC_CAPS ("video/mpegts, " "systemstream = (boolean) true ")
);
enum
{
ARG_0,
PROP_PROGRAM_NUMBERS,
/* 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_dispose (GObject * object);
static void mpegts_parse_finalize (GObject * object);
static MpegTSParsePad *mpegts_parse_create_tspad (MpegTSParse * parse,
const gchar * name);
static void mpegts_parse_destroy_tspad (MpegTSParse * parse,
MpegTSParsePad * tspad);
static GstPad *mpegts_parse_activate_program (MpegTSParse * parse,
MpegTSParseProgram * program);
static void mpegts_parse_free_program (MpegTSParseProgram * program);
static void mpegts_parse_free_stream (MpegTSParseStream * ptream);
static void mpegts_parse_reset_selected_programs (MpegTSParse * parse,
gchar * programs);
static void mpegts_parse_pad_removed (GstElement * element, GstPad * pad);
static GstPad *mpegts_parse_request_new_pad (GstElement * element,
GstPadTemplate * templ, const gchar * name);
static void mpegts_parse_release_pad (GstElement * element, GstPad * pad);
static GstFlowReturn mpegts_parse_chain (GstPad * pad, GstBuffer * buf);
static gboolean mpegts_parse_sink_event (GstPad * pad, GstEvent * event);
static GstStateChangeReturn mpegts_parse_change_state (GstElement * element,
GstStateChange transition);
static gboolean mpegts_parse_src_pad_query (GstPad * pad, GstQuery * query);
GST_BOILERPLATE (MpegTSParse, mpegts_parse, GstElement, GST_TYPE_ELEMENT);
static const guint32 crc_tab[256] = {
0x00000000, 0x04c11db7, 0x09823b6e, 0x0d4326d9, 0x130476dc, 0x17c56b6b,
0x1a864db2, 0x1e475005, 0x2608edb8, 0x22c9f00f, 0x2f8ad6d6, 0x2b4bcb61,
0x350c9b64, 0x31cd86d3, 0x3c8ea00a, 0x384fbdbd, 0x4c11db70, 0x48d0c6c7,
0x4593e01e, 0x4152fda9, 0x5f15adac, 0x5bd4b01b, 0x569796c2, 0x52568b75,
0x6a1936c8, 0x6ed82b7f, 0x639b0da6, 0x675a1011, 0x791d4014, 0x7ddc5da3,
0x709f7b7a, 0x745e66cd, 0x9823b6e0, 0x9ce2ab57, 0x91a18d8e, 0x95609039,
0x8b27c03c, 0x8fe6dd8b, 0x82a5fb52, 0x8664e6e5, 0xbe2b5b58, 0xbaea46ef,
0xb7a96036, 0xb3687d81, 0xad2f2d84, 0xa9ee3033, 0xa4ad16ea, 0xa06c0b5d,
0xd4326d90, 0xd0f37027, 0xddb056fe, 0xd9714b49, 0xc7361b4c, 0xc3f706fb,
0xceb42022, 0xca753d95, 0xf23a8028, 0xf6fb9d9f, 0xfbb8bb46, 0xff79a6f1,
0xe13ef6f4, 0xe5ffeb43, 0xe8bccd9a, 0xec7dd02d, 0x34867077, 0x30476dc0,
0x3d044b19, 0x39c556ae, 0x278206ab, 0x23431b1c, 0x2e003dc5, 0x2ac12072,
0x128e9dcf, 0x164f8078, 0x1b0ca6a1, 0x1fcdbb16, 0x018aeb13, 0x054bf6a4,
0x0808d07d, 0x0cc9cdca, 0x7897ab07, 0x7c56b6b0, 0x71159069, 0x75d48dde,
0x6b93dddb, 0x6f52c06c, 0x6211e6b5, 0x66d0fb02, 0x5e9f46bf, 0x5a5e5b08,
0x571d7dd1, 0x53dc6066, 0x4d9b3063, 0x495a2dd4, 0x44190b0d, 0x40d816ba,
0xaca5c697, 0xa864db20, 0xa527fdf9, 0xa1e6e04e, 0xbfa1b04b, 0xbb60adfc,
0xb6238b25, 0xb2e29692, 0x8aad2b2f, 0x8e6c3698, 0x832f1041, 0x87ee0df6,
0x99a95df3, 0x9d684044, 0x902b669d, 0x94ea7b2a, 0xe0b41de7, 0xe4750050,
0xe9362689, 0xedf73b3e, 0xf3b06b3b, 0xf771768c, 0xfa325055, 0xfef34de2,
0xc6bcf05f, 0xc27dede8, 0xcf3ecb31, 0xcbffd686, 0xd5b88683, 0xd1799b34,
0xdc3abded, 0xd8fba05a, 0x690ce0ee, 0x6dcdfd59, 0x608edb80, 0x644fc637,
0x7a089632, 0x7ec98b85, 0x738aad5c, 0x774bb0eb, 0x4f040d56, 0x4bc510e1,
0x46863638, 0x42472b8f, 0x5c007b8a, 0x58c1663d, 0x558240e4, 0x51435d53,
0x251d3b9e, 0x21dc2629, 0x2c9f00f0, 0x285e1d47, 0x36194d42, 0x32d850f5,
0x3f9b762c, 0x3b5a6b9b, 0x0315d626, 0x07d4cb91, 0x0a97ed48, 0x0e56f0ff,
0x1011a0fa, 0x14d0bd4d, 0x19939b94, 0x1d528623, 0xf12f560e, 0xf5ee4bb9,
0xf8ad6d60, 0xfc6c70d7, 0xe22b20d2, 0xe6ea3d65, 0xeba91bbc, 0xef68060b,
0xd727bbb6, 0xd3e6a601, 0xdea580d8, 0xda649d6f, 0xc423cd6a, 0xc0e2d0dd,
0xcda1f604, 0xc960ebb3, 0xbd3e8d7e, 0xb9ff90c9, 0xb4bcb610, 0xb07daba7,
0xae3afba2, 0xaafbe615, 0xa7b8c0cc, 0xa379dd7b, 0x9b3660c6, 0x9ff77d71,
0x92b45ba8, 0x9675461f, 0x8832161a, 0x8cf30bad, 0x81b02d74, 0x857130c3,
0x5d8a9099, 0x594b8d2e, 0x5408abf7, 0x50c9b640, 0x4e8ee645, 0x4a4ffbf2,
0x470cdd2b, 0x43cdc09c, 0x7b827d21, 0x7f436096, 0x7200464f, 0x76c15bf8,
0x68860bfd, 0x6c47164a, 0x61043093, 0x65c52d24, 0x119b4be9, 0x155a565e,
0x18197087, 0x1cd86d30, 0x029f3d35, 0x065e2082, 0x0b1d065b, 0x0fdc1bec,
0x3793a651, 0x3352bbe6, 0x3e119d3f, 0x3ad08088, 0x2497d08d, 0x2056cd3a,
0x2d15ebe3, 0x29d4f654, 0xc5a92679, 0xc1683bce, 0xcc2b1d17, 0xc8ea00a0,
0xd6ad50a5, 0xd26c4d12, 0xdf2f6bcb, 0xdbee767c, 0xe3a1cbc1, 0xe760d676,
0xea23f0af, 0xeee2ed18, 0xf0a5bd1d, 0xf464a0aa, 0xf9278673, 0xfde69bc4,
0x89b8fd09, 0x8d79e0be, 0x803ac667, 0x84fbdbd0, 0x9abc8bd5, 0x9e7d9662,
0x933eb0bb, 0x97ffad0c, 0xafb010b1, 0xab710d06, 0xa6322bdf, 0xa2f33668,
0xbcb4666d, 0xb8757bda, 0xb5365d03, 0xb1f740b4
};
/* relicenced to LGPL from fluendo ts demuxer */
static guint32
mpegts_parse_calc_crc32 (guint8 * data, guint datalen)
{
gint i;
guint32 crc = 0xffffffff;
for (i = 0; i < datalen; i++) {
crc = (crc << 8) ^ crc_tab[((crc >> 24) ^ *data++) & 0xff];
}
return crc;
}
static void
mpegts_parse_base_init (gpointer klass)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&sink_template));
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_details (element_class, &mpegts_parse_details);
}
static void
mpegts_parse_class_init (MpegTSParseClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *element_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;
element_class->change_state = mpegts_parse_change_state;
gobject_class = G_OBJECT_CLASS (klass);
gobject_class->set_property = mpegts_parse_set_property;
gobject_class->get_property = mpegts_parse_get_property;
gobject_class->dispose = mpegts_parse_dispose;
gobject_class->finalize = mpegts_parse_finalize;
g_object_class_install_property (gobject_class, PROP_PROGRAM_NUMBERS,
g_param_spec_string ("program-numbers",
"Program Numbers",
"Colon separated list of programs", "", G_PARAM_READWRITE));
}
static gboolean
foreach_psi_pid_remove (gpointer key, gpointer value, gpointer data)
{
return TRUE;
}
static void
mpegts_parse_reset (MpegTSParse * parse)
{
mpegts_packetizer_clear (parse->packetizer);
g_hash_table_foreach_remove (parse->psi_pids, foreach_psi_pid_remove, NULL);
/* PAT */
g_hash_table_insert (parse->psi_pids,
GINT_TO_POINTER (0), GINT_TO_POINTER (1));
/* pmt pids will be added and removed dynamically */
}
static void
mpegts_parse_init (MpegTSParse * parse, MpegTSParseClass * klass)
{
parse->sinkpad = gst_pad_new_from_static_template (&sink_template, "sink");
gst_pad_set_chain_function (parse->sinkpad, mpegts_parse_chain);
gst_pad_set_event_function (parse->sinkpad, mpegts_parse_sink_event);
gst_element_add_pad (GST_ELEMENT (parse), parse->sinkpad);
parse->disposed = FALSE;
parse->packetizer = mpegts_packetizer_new ();
parse->program_numbers = g_strdup ("");
parse->pads_to_add = NULL;
parse->programs = g_hash_table_new_full (g_direct_hash, g_direct_equal,
NULL, (GDestroyNotify) mpegts_parse_free_program);
parse->psi_pids = g_hash_table_new (g_direct_hash, g_direct_equal);
mpegts_parse_reset (parse);
}
static void
mpegts_parse_dispose (GObject * object)
{
MpegTSParse *parse = GST_MPEGTS_PARSE (object);
if (!parse->disposed) {
g_object_unref (parse->packetizer);
parse->disposed = TRUE;
}
if (G_OBJECT_CLASS (parent_class)->dispose)
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static void
mpegts_parse_finalize (GObject * object)
{
MpegTSParse *parse = GST_MPEGTS_PARSE (object);
g_free (parse->program_numbers);
if (parse->pat)
gst_structure_free (parse->pat);
g_hash_table_destroy (parse->programs);
g_hash_table_destroy (parse->psi_pids);
if (G_OBJECT_CLASS (parent_class)->finalize)
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
mpegts_parse_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
MpegTSParse *parse = GST_MPEGTS_PARSE (object);
switch (prop_id) {
case PROP_PROGRAM_NUMBERS:
mpegts_parse_reset_selected_programs (parse, g_value_dup_string (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)
{
MpegTSParse *parse = GST_MPEGTS_PARSE (object);
switch (prop_id) {
case PROP_PROGRAM_NUMBERS:
g_value_set_string (value, parse->program_numbers);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
}
}
static MpegTSParseProgram *
mpegts_parse_add_program (MpegTSParse * parse,
gint program_number, guint16 pmt_pid)
{
MpegTSParseProgram *program;
program = g_new0 (MpegTSParseProgram, 1);
program->program_number = program_number;
program->pmt_pid = pmt_pid;
program->pcr_pid = G_MAXUINT16;
program->streams = g_hash_table_new_full (g_direct_hash, g_direct_equal,
NULL, (GDestroyNotify) mpegts_parse_free_stream);
program->patcount = 1;
program->selected = 0;
program->active = FALSE;
g_hash_table_insert (parse->programs,
GINT_TO_POINTER (program_number), program);
return program;
}
static MpegTSParseProgram *
mpegts_parse_get_program (MpegTSParse * parse, gint program_number)
{
MpegTSParseProgram *program;
program = (MpegTSParseProgram *) g_hash_table_lookup (parse->programs,
GINT_TO_POINTER ((gint) program_number));
return program;
}
static GstPad *
mpegts_parse_activate_program (MpegTSParse * parse,
MpegTSParseProgram * program)
{
MpegTSParsePad *tspad;
gchar *pad_name;
pad_name = g_strdup_printf ("program_%d", program->program_number);
tspad = mpegts_parse_create_tspad (parse, pad_name);
tspad->program_number = program->program_number;
tspad->program = program;
program->tspad = tspad;
g_free (pad_name);
gst_pad_set_active (tspad->pad, TRUE);
program->active = TRUE;
return tspad->pad;
}
static GstPad *
mpegts_parse_deactivate_program (MpegTSParse * parse,
MpegTSParseProgram * program)
{
MpegTSParsePad *tspad;
tspad = program->tspad;
gst_pad_set_active (tspad->pad, FALSE);
program->active = FALSE;
/* tspad will be destroyed in GstElementClass::pad_removed */
return tspad->pad;
}
static void
mpegts_parse_free_program (MpegTSParseProgram * program)
{
if (program->pmt_info)
gst_structure_free (program->pmt_info);
g_hash_table_destroy (program->streams);
g_free (program);
}
static void
mpegts_parse_remove_program (MpegTSParse * parse, gint program_number)
{
g_hash_table_remove (parse->programs, GINT_TO_POINTER (program_number));
}
static void
mpegts_parse_sync_program_pads (MpegTSParse * parse,
GList * to_add, GList * to_remove)
{
GList *walk;
for (walk = to_remove; walk; walk = walk->next)
gst_element_remove_pad (GST_ELEMENT (parse), GST_PAD (walk->data));
for (walk = to_add; walk; walk = walk->next)
gst_element_add_pad (GST_ELEMENT (parse), GST_PAD (walk->data));
if (to_add)
g_list_free (to_add);
if (to_remove)
g_list_free (to_remove);
}
static MpegTSParseStream *
mpegts_parse_program_add_stream (MpegTSParse * parse,
MpegTSParseProgram * program, guint16 pid, guint8 stream_type)
{
MpegTSParseStream *stream;
stream = g_new0 (MpegTSParseStream, 1);
stream->pid = pid;
stream->stream_type = stream_type;
g_hash_table_insert (program->streams, GINT_TO_POINTER ((gint) pid), stream);
return stream;
}
static void
foreach_program_activate_or_deactivate (gpointer key, gpointer value,
gpointer data)
{
MpegTSParse *parse = GST_MPEGTS_PARSE (data);
MpegTSParseProgram *program = (MpegTSParseProgram *) value;
/* at this point selected programs have program->selected == 2,
* unselected programs thay may have to be deactivated have selected == 1 and
* unselected inactive programs have selected == 0 */
switch (--program->selected) {
case 1:
/* selected */
if (!program->active && program->pmt_pid != G_MAXUINT16)
parse->pads_to_add = g_list_append (parse->pads_to_add,
mpegts_parse_activate_program (parse, program));
break;
case 0:
/* unselected */
if (program->active)
parse->pads_to_remove = g_list_append (parse->pads_to_remove,
mpegts_parse_deactivate_program (parse, program));
break;
case -1:
/* was already unselected */
program->selected = 0;
break;
default:
g_return_if_reached ();
}
}
static void
mpegts_parse_reset_selected_programs (MpegTSParse * parse,
gchar * program_numbers)
{
GList *pads_to_add = NULL;
GList *pads_to_remove = NULL;
GST_OBJECT_LOCK (parse);
if (parse->program_numbers)
g_free (parse->program_numbers);
parse->program_numbers = program_numbers;
if (*parse->program_numbers != '\0') {
gint program_number;
MpegTSParseProgram *program;
gchar **progs, **walk;
progs = g_strsplit (parse->program_numbers, ":", 0);
walk = progs;
while (*walk != NULL) {
program_number = strtol (*walk, NULL, 0);
program = mpegts_parse_get_program (parse, program_number);
if (program == NULL)
/* create the program, it will get activated once we get a PMT for it */
program = mpegts_parse_add_program (parse, program_number, G_MAXUINT16);
program->selected = 2;
++walk;
}
g_strfreev (progs);
}
g_hash_table_foreach (parse->programs,
foreach_program_activate_or_deactivate, parse);
pads_to_add = parse->pads_to_add;
parse->pads_to_add = NULL;
pads_to_remove = parse->pads_to_remove;
parse->pads_to_remove = NULL;
GST_OBJECT_UNLOCK (parse);
mpegts_parse_sync_program_pads (parse, pads_to_add, pads_to_remove);
}
static void
mpegts_parse_free_stream (MpegTSParseStream * stream)
{
g_free (stream);
}
static void
mpegts_parse_program_remove_stream (MpegTSParse * parse,
MpegTSParseProgram * program, guint16 pid)
{
g_hash_table_remove (program->streams, GINT_TO_POINTER ((gint) pid));
}
static MpegTSParsePad *
mpegts_parse_create_tspad (MpegTSParse * 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 (MpegTSParse * parse, MpegTSParsePad * tspad)
{
/* free the wrapper */
g_free (tspad);
}
static void
mpegts_parse_pad_removed (GstElement * element, GstPad * pad)
{
MpegTSParsePad *tspad;
MpegTSParse *parse = GST_MPEGTS_PARSE (element);
if (gst_pad_get_direction (pad) == GST_PAD_SINK)
return;
tspad = (MpegTSParsePad *) gst_pad_get_element_private (pad);
mpegts_parse_destroy_tspad (parse, tspad);
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 * unused)
{
MpegTSParse *parse;
gchar *name;
GstPad *pad;
g_return_val_if_fail (template != NULL, NULL);
g_return_val_if_fail (GST_IS_MPEGTS_PARSE (element), NULL);
parse = GST_MPEGTS_PARSE (element);
GST_OBJECT_LOCK (element);
name = g_strdup_printf ("src%d", parse->req_pads++);
GST_OBJECT_UNLOCK (element);
pad = mpegts_parse_create_tspad (parse, name)->pad;
gst_pad_set_active (pad, TRUE);
gst_element_add_pad (element, pad);
return pad;
}
static void
mpegts_parse_release_pad (GstElement * element, GstPad * pad)
{
g_return_if_fail (GST_IS_MPEGTS_PARSE (element));
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 (MpegTSParse * parse, MpegTSParsePad * tspad,
MpegTSPacketizerSection * section, GstBuffer * buffer)
{
GstFlowReturn ret = GST_FLOW_NOT_LINKED;
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;
ret = GST_FLOW_OK;
}
}
GST_DEBUG_OBJECT (parse,
"pushing section: %d program number: %d table_id: %d", to_push,
tspad->program_number, section->table_id);
if (to_push) {
ret = gst_pad_push (tspad->pad, buffer);
} else {
gst_buffer_unref (buffer);
if (gst_pad_is_linked (tspad->pad))
ret = GST_FLOW_OK;
}
return ret;
}
static GstFlowReturn
mpegts_parse_tspad_push (MpegTSParse * parse, MpegTSParsePad * tspad,
guint16 pid, GstBuffer * buffer)
{
GstFlowReturn ret = GST_FLOW_NOT_LINKED;
GHashTable *pad_pids = NULL;
if (tspad->program_number != -1) {
if (tspad->program) {
pad_pids = tspad->program->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 */
gst_buffer_unref (buffer);
ret = GST_FLOW_OK;
goto out;
}
}
if (pad_pids == NULL ||
g_hash_table_lookup (pad_pids, GINT_TO_POINTER ((gint) pid)) != NULL) {
/* push if there's no filter or if the pid is in the filter */
ret = gst_pad_push (tspad->pad, buffer);
} else {
gst_buffer_unref (buffer);
if (gst_pad_is_linked (tspad->pad))
ret = GST_FLOW_OK;
}
out:
return ret;
}
static void
pad_clear_for_push (GstPad * pad, MpegTSParse * 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 (MpegTSParse * parse, MpegTSPacketizerPacket * packet,
MpegTSPacketizerSection * section)
{
GstIterator *iterator;
gboolean done = FALSE;
gpointer pad = NULL;
MpegTSParsePad *tspad;
guint16 pid;
GstBuffer *buffer;
GstFlowReturn ret;
GstCaps *caps;
pid = packet->pid;
buffer = packet->buffer;
/* we have the same caps on all the src pads */
caps = gst_static_pad_template_get_caps (&src_template);
gst_buffer_set_caps (buffer, caps);
gst_caps_unref (caps);
GST_OBJECT_LOCK (parse);
/* clear tspad->pushed on pads */
g_list_foreach (GST_ELEMENT_CAST (parse)->srcpads,
(GFunc) pad_clear_for_push, parse);
if (GST_ELEMENT_CAST (parse)->srcpads)
ret = GST_FLOW_NOT_LINKED;
else
ret = GST_FLOW_OK;
GST_OBJECT_UNLOCK (parse);
iterator = gst_element_iterate_src_pads (GST_ELEMENT_CAST (parse));
while (!done) {
switch (gst_iterator_next (iterator, &pad)) {
case GST_ITERATOR_OK:
tspad = gst_pad_get_element_private (GST_PAD (pad));
/* make sure to push only once if the iterator resyncs */
if (!tspad->pushed) {
/* ref the buffer as gst_pad_push takes a ref but we want to reuse the
* same buffer for next pushes */
gst_buffer_ref (buffer);
if (section) {
tspad->flow_return =
mpegts_parse_tspad_push_section (parse, tspad, section, buffer);
} else {
tspad->flow_return =
mpegts_parse_tspad_push (parse, tspad, pid, buffer);
}
tspad->pushed = TRUE;
if (GST_FLOW_IS_FATAL (tspad->flow_return)) {
/* return the error upstream */
ret = tspad->flow_return;
done = TRUE;
}
}
if (ret == GST_FLOW_NOT_LINKED)
ret = tspad->flow_return;
/* the iterator refs the pad */
g_object_unref (GST_PAD (pad));
break;
case GST_ITERATOR_RESYNC:
gst_iterator_resync (iterator);
break;
case GST_ITERATOR_DONE:
done = TRUE;
break;
default:
g_warning ("this should not be reached");
}
}
gst_iterator_free (iterator);
gst_buffer_unref (buffer);
packet->buffer = NULL;
return ret;
}
static gboolean
mpegts_parse_is_psi (MpegTSParse * parse, MpegTSPacketizerPacket * packet)
{
gboolean retval = FALSE;
guint8 table_id;
int i;
guint8 si_tables[] = { 0x00, 0x01, 0x02, 0x03, 0x40, 0x41, 0x42, 0x46, 0x4A,
0x4E, 0x4F, 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59,
0x5A, 0x5B, 0x5C, 0x5D, 0x5E, 0x5F, 0x60, 0x61, 0x62, 0x63, 0x64, 0x65,
0x66, 0x67, 0x68, 0x69, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F, 0x70, 0x71,
0x72, 0x73, 0x7E, 0x7F, TABLE_ID_UNSET
};
if (g_hash_table_lookup (parse->psi_pids,
GINT_TO_POINTER ((gint) packet->pid)) != NULL)
retval = TRUE;
if (!retval) {
if (packet->payload_unit_start_indicator) {
table_id = *(packet->data);
i = 0;
while (si_tables[i] != TABLE_ID_UNSET) {
if (si_tables[i] == table_id) {
GST_DEBUG_OBJECT (parse, "Packet has table id 0x%x", table_id);
retval = TRUE;
break;
}
i++;
}
} else {
MpegTSPacketizerStream *stream = (MpegTSPacketizerStream *)
g_hash_table_lookup (parse->packetizer->streams,
GINT_TO_POINTER ((gint) packet->pid));
if (stream) {
i = 0;
GST_DEBUG_OBJECT (parse, "section table id: 0x%x",
stream->section_table_id);
while (si_tables[i] != TABLE_ID_UNSET) {
if (si_tables[i] == stream->section_table_id) {
retval = TRUE;
break;
}
i++;
}
}
}
}
GST_DEBUG_OBJECT (parse, "Packet of pid 0x%x is psi: %d", packet->pid,
retval);
return retval;
}
static void
mpegts_parse_apply_pat (MpegTSParse * parse, GstStructure * pat_info)
{
const GValue *value;
GstStructure *old_pat;
GstStructure *program_info;
guint program_number;
guint pid;
MpegTSParseProgram *program;
gint i;
GList *pads_to_add = NULL;
GList *pads_to_remove = NULL;
const GValue *programs;
gchar *dbg;
old_pat = parse->pat;
parse->pat = pat_info;
dbg = gst_structure_to_string (pat_info);
GST_INFO_OBJECT (parse, "PAT %s", dbg);
g_free (dbg);
gst_element_post_message (GST_ELEMENT_CAST (parse),
gst_message_new_element (GST_OBJECT (parse),
gst_structure_copy (pat_info)));
GST_OBJECT_LOCK (parse);
programs = gst_structure_get_value (pat_info, "programs");
/* activate the new table */
for (i = 0; i < gst_value_list_get_size (programs); ++i) {
value = gst_value_list_get_value (programs, i);
program_info = g_value_get_boxed (value);
gst_structure_get_uint (program_info, "program-number", &program_number);
gst_structure_get_uint (program_info, "pid", &pid);
program = mpegts_parse_get_program (parse, program_number);
if (program) {
if (program->pmt_pid != pid) {
if (program->pmt_pid != G_MAXUINT16) {
/* pmt pid changed */
g_hash_table_remove (parse->psi_pids,
GINT_TO_POINTER ((gint) program->pmt_pid));
}
program->pmt_pid = pid;
g_hash_table_insert (parse->psi_pids,
GINT_TO_POINTER ((gint) pid), GINT_TO_POINTER (1));
}
program->patcount += 1;
} else {
g_hash_table_insert (parse->psi_pids,
GINT_TO_POINTER ((gint) pid), GINT_TO_POINTER (1));
program = mpegts_parse_add_program (parse, program_number, pid);
}
if (program->selected && !program->active)
parse->pads_to_add = g_list_append (parse->pads_to_add,
mpegts_parse_activate_program (parse, program));
}
if (old_pat) {
/* deactivate the old table */
programs = gst_structure_get_value (old_pat, "programs");
for (i = 0; i < gst_value_list_get_size (programs); ++i) {
value = gst_value_list_get_value (programs, i);
program_info = g_value_get_boxed (value);
gst_structure_get_uint (program_info, "program-number", &program_number);
gst_structure_get_uint (program_info, "pid", &pid);
program = mpegts_parse_get_program (parse, program_number);
if (program == NULL) {
GST_DEBUG_OBJECT (parse, "broken PAT, duplicated entry for program %d",
program_number);
continue;
}
if (--program->patcount > 0)
/* the program has been referenced by the new pat, keep it */
continue;
{
gchar *dbg = gst_structure_to_string (program_info);
GST_INFO_OBJECT (parse, "PAT removing program %s", dbg);
g_free (dbg);
}
if (program->active)
parse->pads_to_remove = g_list_append (parse->pads_to_remove,
mpegts_parse_deactivate_program (parse, program));
mpegts_parse_remove_program (parse, program_number);
g_hash_table_remove (parse->psi_pids, GINT_TO_POINTER ((gint) pid));
}
gst_structure_free (old_pat);
}
pads_to_add = parse->pads_to_add;
parse->pads_to_add = NULL;
pads_to_remove = parse->pads_to_remove;
parse->pads_to_remove = NULL;
GST_OBJECT_UNLOCK (parse);
mpegts_parse_sync_program_pads (parse, pads_to_add, pads_to_remove);
}
static void
mpegts_parse_apply_pmt (MpegTSParse * parse,
guint16 pmt_pid, GstStructure * pmt_info)
{
MpegTSParseProgram *program;
guint program_number;
guint pcr_pid;
guint pid;
guint stream_type;
GstStructure *stream;
gint i;
const GValue *old_streams;
const GValue *new_streams;
const GValue *value;
gst_structure_get_uint (pmt_info, "program-number", &program_number);
gst_structure_get_uint (pmt_info, "pcr-pid", &pcr_pid);
new_streams = gst_structure_get_value (pmt_info, "streams");
GST_OBJECT_LOCK (parse);
program = mpegts_parse_get_program (parse, program_number);
if (program) {
if (program->pmt_info) {
/* deactivate old pmt */
old_streams = gst_structure_get_value (program->pmt_info, "streams");
for (i = 0; i < gst_value_list_get_size (old_streams); ++i) {
value = gst_value_list_get_value (old_streams, i);
stream = g_value_get_boxed (value);
gst_structure_get_uint (stream, "pid", &pid);
gst_structure_get_uint (stream, "stream-type", &stream_type);
mpegts_parse_program_remove_stream (parse, program, (guint16) pid);
}
/* remove pcr stream */
mpegts_parse_program_remove_stream (parse, program, program->pcr_pid);
gst_structure_free (program->pmt_info);
}
} else {
/* no PAT?? */
g_hash_table_insert (parse->psi_pids,
GINT_TO_POINTER ((gint) pmt_pid), GINT_TO_POINTER (1));
program = mpegts_parse_add_program (parse, program_number, pid);
}
/* activate new pmt */
program->pmt_info = pmt_info;
program->pmt_pid = pmt_pid;
program->pcr_pid = pcr_pid;
mpegts_parse_program_add_stream (parse, program, (guint16) pcr_pid, -1);
for (i = 0; i < gst_value_list_get_size (new_streams); ++i) {
value = gst_value_list_get_value (new_streams, i);
stream = g_value_get_boxed (value);
gst_structure_get_uint (stream, "pid", &pid);
gst_structure_get_uint (stream, "stream-type", &stream_type);
mpegts_parse_program_add_stream (parse, program,
(guint16) pid, (guint8) stream_type);
}
GST_OBJECT_UNLOCK (parse);
{
gchar *dbg = gst_structure_to_string (pmt_info);
GST_DEBUG_OBJECT (parse, "new pmt %s", dbg);
g_free (dbg);
}
gst_element_post_message (GST_ELEMENT_CAST (parse),
gst_message_new_element (GST_OBJECT (parse),
gst_structure_copy (pmt_info)));
}
static void
mpegts_parse_apply_nit (MpegTSParse * parse,
guint16 pmt_pid, GstStructure * nit_info)
{
gst_element_post_message (GST_ELEMENT_CAST (parse),
gst_message_new_element (GST_OBJECT (parse),
gst_structure_copy (nit_info)));
}
static void
mpegts_parse_apply_sdt (MpegTSParse * parse,
guint16 pmt_pid, GstStructure * sdt_info)
{
gst_element_post_message (GST_ELEMENT_CAST (parse),
gst_message_new_element (GST_OBJECT (parse),
gst_structure_copy (sdt_info)));
}
static void
mpegts_parse_apply_eit (MpegTSParse * parse,
guint16 pmt_pid, GstStructure * eit_info)
{
gst_element_post_message (GST_ELEMENT_CAST (parse),
gst_message_new_element (GST_OBJECT (parse),
gst_structure_copy (eit_info)));
}
static gboolean
mpegts_parse_handle_psi (MpegTSParse * parse, MpegTSPacketizerSection * section)
{
gboolean res = TRUE;
GstStructure *structure = NULL;
if (mpegts_parse_calc_crc32 (GST_BUFFER_DATA (section->buffer),
GST_BUFFER_SIZE (section->buffer)) != 0) {
GST_WARNING_OBJECT (parse, "bad crc in psi pid 0x%x", section->pid);
return FALSE;
}
switch (section->table_id) {
case 0x00:
/* PAT */
structure = mpegts_packetizer_parse_pat (parse->packetizer, section);
if (structure)
mpegts_parse_apply_pat (parse, structure);
else
res = FALSE;
break;
case 0x02:
structure = mpegts_packetizer_parse_pmt (parse->packetizer, section);
if (structure)
mpegts_parse_apply_pmt (parse, section->pid, structure);
else
res = FALSE;
break;
case 0x40:
/* NIT, actual network */
case 0x41:
/* NIT, other network */
structure = mpegts_packetizer_parse_nit (parse->packetizer, section);
if (structure)
mpegts_parse_apply_nit (parse, section->pid, structure);
else
res = FALSE;
break;
case 0x42:
case 0x46:
structure = mpegts_packetizer_parse_sdt (parse->packetizer, section);
if (structure)
mpegts_parse_apply_sdt (parse, section->pid, structure);
else
res = FALSE;
break;
case 0x4E:
case 0x4F:
/* EIT, present/following */
case 0x50:
case 0x51:
case 0x52:
case 0x53:
case 0x54:
case 0x55:
case 0x56:
case 0x57:
case 0x58:
case 0x59:
case 0x5A:
case 0x5B:
case 0x5C:
case 0x5D:
case 0x5E:
case 0x5F:
case 0x60:
case 0x61:
case 0x62:
case 0x63:
case 0x64:
case 0x65:
case 0x66:
case 0x67:
case 0x68:
case 0x69:
case 0x6A:
case 0x6B:
case 0x6C:
case 0x6D:
case 0x6E:
case 0x6F:
/* EIT, schedule */
structure = mpegts_packetizer_parse_eit (parse->packetizer, section);
if (structure)
mpegts_parse_apply_eit (parse, section->pid, structure);
else
res = FALSE;
break;
default:
break;
}
if (structure)
gst_structure_free (structure);
return res;
}
static gboolean
mpegts_parse_sink_event (GstPad * pad, GstEvent * event)
{
gboolean res;
MpegTSParse *parse =
GST_MPEGTS_PARSE (gst_object_get_parent (GST_OBJECT (pad)));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_STOP:
mpegts_packetizer_clear (parse->packetizer);
res = gst_pad_event_default (pad, event);
break;
default:
res = gst_pad_event_default (pad, event);
}
gst_object_unref (parse);
return res;
}
static GstFlowReturn
mpegts_parse_chain (GstPad * pad, GstBuffer * buf)
{
GstFlowReturn res = GST_FLOW_OK;
MpegTSParse *parse;
gboolean parsed;
MpegTSPacketizer *packetizer;
MpegTSPacketizerPacket packet;
parse = GST_MPEGTS_PARSE (gst_object_get_parent (GST_OBJECT (pad)));
packetizer = parse->packetizer;
mpegts_packetizer_push (parse->packetizer, buf);
while (mpegts_packetizer_has_packets (parse->packetizer) &&
!GST_FLOW_IS_FATAL (res)) {
/* get the next packet */
parsed = mpegts_packetizer_next_packet (packetizer, &packet);
if (!parsed)
/* bad header, skip the packet */
goto next;
/* parse PSI data */
if (packet.payload != NULL && mpegts_parse_is_psi (parse, &packet)) {
MpegTSPacketizerSection section;
parsed = mpegts_packetizer_push_section (packetizer, &packet, &section);
if (!parsed)
/* bad section data */
goto next;
if (section.complete) {
/* section complete */
parsed = mpegts_parse_handle_psi (parse, &section);
gst_buffer_unref (section.buffer);
if (!parsed)
/* bad PSI table */
goto next;
}
/* we need to push section packet downstream */
res = mpegts_parse_push (parse, &packet, &section);
} else {
/* push the packet downstream */
res = mpegts_parse_push (parse, &packet, NULL);
}
next:
mpegts_packetizer_clear_packet (parse->packetizer, &packet);
}
gst_object_unref (parse);
return res;
}
static GstStateChangeReturn
mpegts_parse_change_state (GstElement * element, GstStateChange transition)
{
MpegTSParse *parse;
GstStateChangeReturn ret;
parse = GST_MPEGTS_PARSE (element);
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_READY:
mpegts_parse_reset (parse);
break;
default:
break;
}
return ret;
}
static gboolean
mpegts_parse_src_pad_query (GstPad * pad, GstQuery * query)
{
MpegTSParse *parse = GST_MPEGTS_PARSE (gst_pad_get_parent (pad));
gboolean res;
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_LATENCY:
{
if ((res = gst_pad_peer_query (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, query);
}
return res;
}
static gboolean
plugin_init (GstPlugin * plugin)
{
GST_DEBUG_CATEGORY_INIT (mpegts_parse_debug, "mpegtsparse", 0,
"MPEG transport stream parser");
mpegts_packetizer_init_debug ();
gst_mpegtsdesc_init_debug ();
return gst_element_register (plugin, "mpegtsparse",
GST_RANK_NONE, GST_TYPE_MPEGTS_PARSE);
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"mpegtsparse",
"MPEG-2 transport stream parser",
plugin_init, VERSION, GST_LICENSE, GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)
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