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gstreamer/gst/mpegtsdemux/mpegtsbase.c
Sebastian Dröge 4ca886c53b mpegtsbase: Call ::program_stopped after removing all streams 
Subclasses want to access the program while removing the streams
and will currently crash because of dereferencing NULL in some cases.
2013-04-10 16:19:00 +02:00

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/*
* mpegtsbase.c -
* Copyright (C) 2007 Alessandro Decina
* 2010 Edward Hervey
* Copyright (C) 2011, Hewlett-Packard Development Company, L.P.
* Author: Youness Alaoui <youness.alaoui@collabora.co.uk>, Collabora Ltd.
* Author: Sebastian Dröge <sebastian.droege@collabora.co.uk>, Collabora Ltd.
* Author: Edward Hervey <bilboed@bilboed.com>, Collabora Ltd.
*
* Authors:
* Alessandro Decina <alessandro@nnva.org>
* Zaheer Abbas Merali <zaheerabbas at merali dot org>
* Edward Hervey <edward.hervey@collabora.co.uk>
*
* 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
/* FIXME 0.11: suppress warnings for deprecated API such as GStaticRecMutex
* with newer GLib versions (>= 2.31.0) */
#define GLIB_DISABLE_DEPRECATION_WARNINGS
#include <stdlib.h>
#include <string.h>
#include <glib.h>
#include <gst/gst-i18n-plugin.h>
#include "mpegtsbase.h"
#include "gstmpegdesc.h"
/* latency in mseconds */
#define TS_LATENCY 700
#define RUNNING_STATUS_RUNNING 4
GST_DEBUG_CATEGORY_STATIC (mpegts_base_debug);
#define GST_CAT_DEFAULT mpegts_base_debug
static GQuark QUARK_PROGRAMS;
static GQuark QUARK_PROGRAM_NUMBER;
static GQuark QUARK_PID;
static GQuark QUARK_PCR_PID;
static GQuark QUARK_STREAMS;
static GQuark QUARK_STREAM_TYPE;
static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/mpegts, " "systemstream = (boolean) true ")
);
enum
{
ARG_0,
/* FILL ME */
};
static void mpegts_base_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void mpegts_base_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void mpegts_base_dispose (GObject * object);
static void mpegts_base_finalize (GObject * object);
static void mpegts_base_free_program (MpegTSBaseProgram * program);
static void mpegts_base_free_stream (MpegTSBaseStream * ptream);
static gboolean mpegts_base_sink_activate (GstPad * pad, GstObject * parent);
static gboolean mpegts_base_sink_activate_mode (GstPad * pad,
GstObject * parent, GstPadMode mode, gboolean active);
static GstFlowReturn mpegts_base_chain (GstPad * pad, GstObject * parent,
GstBuffer * buf);
static gboolean mpegts_base_sink_event (GstPad * pad, GstObject * parent,
GstEvent * event);
static GstStateChangeReturn mpegts_base_change_state (GstElement * element,
GstStateChange transition);
static void mpegts_base_get_tags_from_sdt (MpegTSBase * base,
GstStructure * sdt_info);
static void mpegts_base_get_tags_from_eit (MpegTSBase * base,
GstStructure * eit_info);
static gboolean
remove_each_program (gpointer key, MpegTSBaseProgram * program,
MpegTSBase * base);
static void
_extra_init (void)
{
QUARK_PROGRAMS = g_quark_from_string ("programs");
QUARK_PROGRAM_NUMBER = g_quark_from_string ("program-number");
QUARK_PID = g_quark_from_string ("pid");
QUARK_PCR_PID = g_quark_from_string ("pcr-pid");
QUARK_STREAMS = g_quark_from_string ("streams");
QUARK_STREAM_TYPE = g_quark_from_string ("stream-type");
}
#define mpegts_base_parent_class parent_class
G_DEFINE_TYPE_WITH_CODE (MpegTSBase, mpegts_base, GST_TYPE_ELEMENT,
_extra_init ());
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_base_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_base_class_init (MpegTSBaseClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *element_class;
element_class = GST_ELEMENT_CLASS (klass);
element_class->change_state = mpegts_base_change_state;
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&sink_template));
gobject_class = G_OBJECT_CLASS (klass);
gobject_class->set_property = mpegts_base_set_property;
gobject_class->get_property = mpegts_base_get_property;
gobject_class->dispose = mpegts_base_dispose;
gobject_class->finalize = mpegts_base_finalize;
}
static void
mpegts_base_reset (MpegTSBase * base)
{
MpegTSBaseClass *klass = GST_MPEGTS_BASE_GET_CLASS (base);
mpegts_packetizer_clear (base->packetizer);
memset (base->is_pes, 0, 1024);
memset (base->known_psi, 0, 1024);
/* Known PIDs : PAT, TSDT, IPMP CIT */
MPEGTS_BIT_SET (base->known_psi, 0);
MPEGTS_BIT_SET (base->known_psi, 2);
MPEGTS_BIT_SET (base->known_psi, 3);
/* TDT, TOT, ST */
MPEGTS_BIT_SET (base->known_psi, 0x14);
/* network synchronization */
MPEGTS_BIT_SET (base->known_psi, 0x15);
/* FIXME : Commenting the Following lines is to be in sync with the following
* commit
*
* 61a885613316ce7657c36a6cd215b43f9dc67b79
* mpegtsparse: don't free PAT structure which may still be needed later
*/
/* if (base->pat != NULL) */
/* gst_structure_free (base->pat); */
/* base->pat = NULL; */
/* pmt pids will be added and removed dynamically */
gst_segment_init (&base->segment, GST_FORMAT_UNDEFINED);
base->mode = BASE_MODE_STREAMING;
base->seen_pat = FALSE;
base->seek_offset = -1;
base->upstream_live = FALSE;
base->queried_latency = FALSE;
g_hash_table_foreach_remove (base->programs, (GHRFunc) remove_each_program,
base);
if (klass->reset)
klass->reset (base);
}
static void
mpegts_base_init (MpegTSBase * base)
{
base->sinkpad = gst_pad_new_from_static_template (&sink_template, "sink");
gst_pad_set_activate_function (base->sinkpad, mpegts_base_sink_activate);
gst_pad_set_activatemode_function (base->sinkpad,
mpegts_base_sink_activate_mode);
gst_pad_set_chain_function (base->sinkpad, mpegts_base_chain);
gst_pad_set_event_function (base->sinkpad, mpegts_base_sink_event);
gst_element_add_pad (GST_ELEMENT (base), base->sinkpad);
base->disposed = FALSE;
base->packetizer = mpegts_packetizer_new ();
base->programs = g_hash_table_new_full (g_direct_hash, g_direct_equal,
NULL, (GDestroyNotify) mpegts_base_free_program);
base->is_pes = g_new0 (guint8, 1024);
base->known_psi = g_new0 (guint8, 1024);
base->program_size = sizeof (MpegTSBaseProgram);
base->stream_size = sizeof (MpegTSBaseStream);
mpegts_base_reset (base);
}
static void
mpegts_base_dispose (GObject * object)
{
MpegTSBase *base = GST_MPEGTS_BASE (object);
if (!base->disposed) {
g_object_unref (base->packetizer);
base->disposed = TRUE;
g_free (base->known_psi);
g_free (base->is_pes);
}
if (G_OBJECT_CLASS (parent_class)->dispose)
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static void
mpegts_base_finalize (GObject * object)
{
MpegTSBase *base = GST_MPEGTS_BASE (object);
if (base->pat) {
gst_structure_free (base->pat);
base->pat = NULL;
}
g_hash_table_destroy (base->programs);
if (G_OBJECT_CLASS (parent_class)->finalize)
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
mpegts_base_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
/* MpegTSBase *base = GST_MPEGTS_BASE (object); */
switch (prop_id) {
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
}
}
static void
mpegts_base_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
/* MpegTSBase *base = GST_MPEGTS_BASE (object); */
switch (prop_id) {
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
}
}
/* returns NULL if no matching descriptor found *
* otherwise returns a descriptor that needs to *
* be freed */
guint8 *
mpegts_get_descriptor_from_stream (MpegTSBaseStream * stream, guint8 tag)
{
GValueArray *descriptors = NULL;
GstStructure *stream_info = stream->stream_info;
guint8 *retval = NULL;
int i;
if (!gst_structure_has_field_typed (stream_info, "descriptors",
G_TYPE_VALUE_ARRAY))
goto beach;
gst_structure_get (stream_info, "descriptors", G_TYPE_VALUE_ARRAY,
&descriptors, NULL);
for (i = 0; i < descriptors->n_values; i++) {
GValue *value = g_value_array_get_nth (descriptors, i);
GString *desc = g_value_dup_boxed (value);
if (DESC_TAG (desc->str) == tag) {
retval = (guint8 *) desc->str;
g_string_free (desc, FALSE);
break;
} else
g_string_free (desc, FALSE);
}
g_value_array_free (descriptors);
beach:
return retval;
}
typedef struct
{
gboolean res;
guint16 pid;
} PIDLookup;
static void
foreach_pid_in_program (gpointer key, MpegTSBaseProgram * program,
PIDLookup * lookup)
{
if (!program->active)
return;
if (program->streams[lookup->pid])
lookup->res = TRUE;
}
static gboolean
mpegts_pid_in_active_programs (MpegTSBase * base, guint16 pid)
{
PIDLookup lookup;
lookup.res = FALSE;
lookup.pid = pid;
g_hash_table_foreach (base->programs, (GHFunc) foreach_pid_in_program,
&lookup);
return lookup.res;
}
/* returns NULL if no matching descriptor found *
* otherwise returns a descriptor that needs to *
* be freed */
guint8 *
mpegts_get_descriptor_from_program (MpegTSBaseProgram * program, guint8 tag)
{
GValueArray *descriptors = NULL;
GstStructure *program_info;
guint8 *retval = NULL;
int i;
if (G_UNLIKELY (program == NULL))
goto beach;
program_info = program->pmt_info;
if (!gst_structure_has_field_typed (program_info, "descriptors",
G_TYPE_VALUE_ARRAY))
goto beach;
gst_structure_get (program_info, "descriptors", G_TYPE_VALUE_ARRAY,
&descriptors, NULL);
for (i = 0; i < descriptors->n_values; i++) {
GValue *value = g_value_array_get_nth (descriptors, i);
GString *desc = g_value_dup_boxed (value);
if (DESC_TAG (desc->str) == tag) {
retval = (guint8 *) desc->str;
g_string_free (desc, FALSE);
break;
} else
g_string_free (desc, FALSE);
}
g_value_array_free (descriptors);
beach:
return retval;
}
static MpegTSBaseProgram *
mpegts_base_new_program (MpegTSBase * base,
gint program_number, guint16 pmt_pid)
{
MpegTSBaseProgram *program;
GST_DEBUG_OBJECT (base, "program_number : %d, pmt_pid : %d",
program_number, pmt_pid);
program = g_malloc0 (base->program_size);
program->program_number = program_number;
program->pmt_pid = pmt_pid;
program->pcr_pid = G_MAXUINT16;
program->streams = g_new0 (MpegTSBaseStream *, 0x2000);
program->patcount = 0;
return program;
}
MpegTSBaseProgram *
mpegts_base_add_program (MpegTSBase * base,
gint program_number, guint16 pmt_pid)
{
MpegTSBaseProgram *program;
GST_DEBUG_OBJECT (base, "program_number : %d, pmt_pid : %d",
program_number, pmt_pid);
program = mpegts_base_new_program (base, program_number, pmt_pid);
/* Mark the PMT PID as being a known PSI PID */
MPEGTS_BIT_SET (base->known_psi, pmt_pid);
g_hash_table_insert (base->programs,
GINT_TO_POINTER (program_number), program);
return program;
}
MpegTSBaseProgram *
mpegts_base_get_program (MpegTSBase * base, gint program_number)
{
MpegTSBaseProgram *program;
program = (MpegTSBaseProgram *) g_hash_table_lookup (base->programs,
GINT_TO_POINTER ((gint) program_number));
return program;
}
static MpegTSBaseProgram *
mpegts_base_steal_program (MpegTSBase * base, gint program_number)
{
MpegTSBaseProgram *program;
program = (MpegTSBaseProgram *) g_hash_table_lookup (base->programs,
GINT_TO_POINTER ((gint) program_number));
if (program)
g_hash_table_steal (base->programs,
GINT_TO_POINTER ((gint) program_number));
return program;
}
static void
mpegts_base_free_program (MpegTSBaseProgram * program)
{
GList *tmp;
if (program->pmt_info)
gst_structure_free (program->pmt_info);
for (tmp = program->stream_list; tmp; tmp = tmp->next)
mpegts_base_free_stream ((MpegTSBaseStream *) tmp->data);
if (program->stream_list)
g_list_free (program->stream_list);
g_free (program->streams);
if (program->tags)
gst_tag_list_unref (program->tags);
g_free (program);
}
void
mpegts_base_remove_program (MpegTSBase * base, gint program_number)
{
GST_DEBUG_OBJECT (base, "program_number : %d", program_number);
g_hash_table_remove (base->programs, GINT_TO_POINTER (program_number));
}
static MpegTSBaseStream *
mpegts_base_program_add_stream (MpegTSBase * base,
MpegTSBaseProgram * program, guint16 pid, guint8 stream_type,
GstStructure * stream_info)
{
MpegTSBaseClass *klass = GST_MPEGTS_BASE_GET_CLASS (base);
MpegTSBaseStream *stream;
GST_DEBUG ("pid:0x%04x, stream_type:0x%03x, stream_info:%" GST_PTR_FORMAT,
pid, stream_type, stream_info);
if (G_UNLIKELY (program->streams[pid])) {
GST_WARNING ("Stream already present !");
return NULL;
}
stream = g_malloc0 (base->stream_size);
stream->pid = pid;
stream->stream_type = stream_type;
stream->stream_info = stream_info;
program->streams[pid] = stream;
program->stream_list = g_list_append (program->stream_list, stream);
if (klass->stream_added)
klass->stream_added (base, stream, program);
return stream;
}
static void
mpegts_base_free_stream (MpegTSBaseStream * stream)
{
g_free (stream);
}
void
mpegts_base_program_remove_stream (MpegTSBase * base,
MpegTSBaseProgram * program, guint16 pid)
{
MpegTSBaseClass *klass;
MpegTSBaseStream *stream = program->streams[pid];
GST_DEBUG ("pid:0x%04x", pid);
if (G_UNLIKELY (stream == NULL)) {
/* Can happen if the PCR PID is the same as a audio/video PID */
GST_DEBUG ("Stream already removed");
return;
}
klass = GST_MPEGTS_BASE_GET_CLASS (base);
/* If subclass needs it, inform it of the stream we are about to remove */
if (klass->stream_removed)
klass->stream_removed (base, stream);
program->stream_list = g_list_remove_all (program->stream_list, stream);
mpegts_base_free_stream (stream);
program->streams[pid] = NULL;
}
/* Return TRUE if programs are equal */
static gboolean
mpegts_base_is_same_program (MpegTSBase * base, MpegTSBaseProgram * oldprogram,
guint16 new_pmt_pid, GstStructure * new_pmt_info)
{
guint i, nbstreams;
guint pcr_pid;
guint pid;
guint stream_type;
GstStructure *stream;
MpegTSBaseStream *oldstream;
gboolean sawpcrpid = FALSE;
const GValue *new_streams;
const GValue *value;
if (oldprogram->pmt_pid != new_pmt_pid) {
GST_DEBUG ("Different pmt_pid (new:0x%04x, old:0x%04x)", new_pmt_pid,
oldprogram->pmt_pid);
return FALSE;
}
gst_structure_id_get (new_pmt_info, QUARK_PCR_PID, G_TYPE_UINT, &pcr_pid,
NULL);
if (oldprogram->pcr_pid != pcr_pid) {
GST_DEBUG ("Different pcr_pid (new:0x%04x, old:0x%04x)",
pcr_pid, oldprogram->pcr_pid);
return FALSE;
}
/* Check the streams */
new_streams = gst_structure_id_get_value (new_pmt_info, QUARK_STREAMS);
nbstreams = gst_value_list_get_size (new_streams);
for (i = 0; i < nbstreams; ++i) {
value = gst_value_list_get_value (new_streams, i);
stream = g_value_get_boxed (value);
gst_structure_id_get (stream, QUARK_PID, G_TYPE_UINT, &pid,
QUARK_STREAM_TYPE, G_TYPE_UINT, &stream_type, NULL);
oldstream = oldprogram->streams[pid];
if (!oldstream) {
GST_DEBUG ("New stream 0x%04x not present in old program", pid);
return FALSE;
}
if (oldstream->stream_type != stream_type) {
GST_DEBUG
("New stream 0x%04x has a different stream type (new:%d, old:%d)",
pid, stream_type, oldstream->stream_type);
return FALSE;
}
if (pid == oldprogram->pcr_pid)
sawpcrpid = TRUE;
}
/* If the pcr is not shared with an existing stream, we'll have one extra stream */
if (!sawpcrpid)
nbstreams += 1;
if (nbstreams != g_list_length (oldprogram->stream_list)) {
GST_DEBUG ("Different number of streams (new:%d, old:%d)",
nbstreams, g_list_length (oldprogram->stream_list));
return FALSE;
}
GST_DEBUG ("Programs are equal");
return TRUE;
}
static void
mpegts_base_deactivate_program (MpegTSBase * base, MpegTSBaseProgram * program)
{
gint i, nbstreams;
guint pid;
GstStructure *stream;
const GValue *streams;
const GValue *value;
MpegTSBaseClass *klass = GST_MPEGTS_BASE_GET_CLASS (base);
if (G_UNLIKELY (program->active == FALSE))
return;
GST_DEBUG_OBJECT (base, "Deactivating PMT");
program->active = FALSE;
if (program->pmt_info) {
streams = gst_structure_id_get_value (program->pmt_info, QUARK_STREAMS);
nbstreams = gst_value_list_get_size (streams);
for (i = 0; i < nbstreams; ++i) {
value = gst_value_list_get_value (streams, i);
stream = g_value_get_boxed (value);
gst_structure_id_get (stream, QUARK_PID, G_TYPE_UINT, &pid, NULL);
mpegts_base_program_remove_stream (base, program, (guint16) pid);
/* Only unset the is_pes bit if the PID isn't used in any other active
* program */
if (!mpegts_pid_in_active_programs (base, pid))
MPEGTS_BIT_UNSET (base->is_pes, pid);
}
/* remove pcr stream */
/* FIXME : This might actually be shared with another stream ? */
mpegts_base_program_remove_stream (base, program, program->pcr_pid);
if (!mpegts_pid_in_active_programs (base, program->pcr_pid))
MPEGTS_BIT_UNSET (base->is_pes, program->pcr_pid);
GST_DEBUG ("program stream_list is now %p", program->stream_list);
}
/* Inform subclasses we're deactivating this program */
if (klass->program_stopped)
klass->program_stopped (base, program);
}
static void
mpegts_base_activate_program (MpegTSBase * base, MpegTSBaseProgram * program,
guint16 pmt_pid, GstStructure * pmt_info, gboolean initial_program)
{
guint i, nbstreams;
guint pcr_pid;
guint pid;
guint stream_type;
GstStructure *stream;
const GValue *new_streams;
const GValue *value;
MpegTSBaseClass *klass;
if (G_UNLIKELY (program->active))
return;
GST_DEBUG ("Activating program %d", program->program_number);
gst_structure_id_get (pmt_info, QUARK_PCR_PID, G_TYPE_UINT, &pcr_pid, NULL);
/* activate new pmt */
if (program->pmt_info)
gst_structure_free (program->pmt_info);
program->pmt_info = pmt_info;
program->pmt_pid = pmt_pid;
program->pcr_pid = pcr_pid;
new_streams = gst_structure_id_get_value (pmt_info, QUARK_STREAMS);
nbstreams = gst_value_list_get_size (new_streams);
for (i = 0; i < nbstreams; ++i) {
value = gst_value_list_get_value (new_streams, i);
stream = g_value_get_boxed (value);
gst_structure_id_get (stream, QUARK_PID, G_TYPE_UINT, &pid,
QUARK_STREAM_TYPE, G_TYPE_UINT, &stream_type, NULL);
MPEGTS_BIT_SET (base->is_pes, pid);
mpegts_base_program_add_stream (base, program,
(guint16) pid, (guint8) stream_type, stream);
}
/* We add the PCR pid last. If that PID is already used by one of the media
* streams above, no new stream will be created */
mpegts_base_program_add_stream (base, program, (guint16) pcr_pid, -1, NULL);
MPEGTS_BIT_SET (base->is_pes, pcr_pid);
program->active = TRUE;
program->initial_program = initial_program;
klass = GST_MPEGTS_BASE_GET_CLASS (base);
if (klass->program_started != NULL)
klass->program_started (base, program);
GST_DEBUG_OBJECT (base, "new pmt %" GST_PTR_FORMAT, pmt_info);
}
static inline gboolean
mpegts_base_is_psi (MpegTSBase * base, MpegTSPacketizerPacket * packet)
{
gboolean retval = FALSE;
guint8 *data, table_id = TABLE_ID_UNSET, pointer;
int i;
static const 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, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A, 0x7E, 0x7F,
TABLE_ID_UNSET
};
/* check if it is a pes pid */
if (MPEGTS_BIT_IS_SET (base->is_pes, packet->pid))
goto invalid_pid;
/* check if it part of the PIDs we know contain PSI */
if (!MPEGTS_BIT_IS_SET (base->known_psi, packet->pid))
goto invalid_pid;
if (packet->payload_unit_start_indicator) {
data = packet->data;
pointer = *data++;
data += pointer;
/* 'pointer' value may be invalid on malformed packet
* so we need to avoid out of range */
if (!(data < packet->data_end)) {
GST_WARNING_OBJECT (base,
"Section pointer value exceeds packet size: 0x%x", pointer);
return FALSE;
}
table_id = *(packet->data);
} else {
MpegTSPacketizerStream *stream = (MpegTSPacketizerStream *)
base->packetizer->streams[packet->pid];
if (stream)
table_id = stream->section_table_id;
}
if (G_UNLIKELY (table_id == TABLE_ID_UNSET))
goto beach;
for (i = 0; si_tables[i] != TABLE_ID_UNSET; i++) {
if (G_UNLIKELY (si_tables[i] == table_id)) {
retval = TRUE;
break;
}
}
beach:
GST_DEBUG_OBJECT (base, "Packet of pid 0x%04x (table_id 0x%02x) is psi: %d",
packet->pid, table_id, retval);
return retval;
invalid_pid:
GST_LOG_OBJECT (base, "Packet of pid 0x%04x doesn't belong to a SI stream",
packet->pid);
return FALSE;
}
static void
mpegts_base_apply_pat (MpegTSBase * base, GstStructure * pat_info)
{
const GValue *value;
GstStructure *old_pat;
GstStructure *program_info;
guint program_number;
guint pid;
MpegTSBaseProgram *program;
gint i, nbprograms;
const GValue *programs;
GST_INFO_OBJECT (base, "PAT %" GST_PTR_FORMAT, pat_info);
/* Applying a new PAT does two things:
* * It adds the new programs to the list of programs this element handles
* and increments at the same time the number of times a program is referenced.
*
* * If there was a previously active PAT, It decrements the reference count
* of all program it used. If a program is no longer needed, it is removed.
*/
old_pat = base->pat;
base->pat = pat_info;
gst_element_post_message (GST_ELEMENT_CAST (base),
gst_message_new_element (GST_OBJECT (base),
gst_structure_copy (pat_info)));
GST_LOG ("Activating new Program Association Table");
/* activate the new table */
programs = gst_structure_id_get_value (pat_info, QUARK_PROGRAMS);
nbprograms = gst_value_list_get_size (programs);
for (i = 0; i < nbprograms; ++i) {
value = gst_value_list_get_value (programs, i);
program_info = g_value_get_boxed (value);
gst_structure_id_get (program_info, QUARK_PROGRAM_NUMBER, G_TYPE_UINT,
&program_number, QUARK_PID, G_TYPE_UINT, &pid, NULL);
program = mpegts_base_get_program (base, program_number);
if (program) {
/* IF the program already existed, just check if the PMT PID changed */
if (program->pmt_pid != pid) {
if (program->pmt_pid != G_MAXUINT16) {
/* pmt pid changed */
/* FIXME: when this happens it may still be pmt pid of another
* program, so setting to False may make it go through expensive
* path in is_psi unnecessarily */
MPEGTS_BIT_UNSET (base->known_psi, program->pmt_pid);
}
program->pmt_pid = pid;
MPEGTS_BIT_SET (base->known_psi, pid);
}
} else {
/* Create a new program */
program = mpegts_base_add_program (base, program_number, pid);
}
/* We mark this program as being referenced by one PAT */
program->patcount += 1;
}
if (old_pat) {
/* deactivate the old table */
GST_LOG ("Deactivating old Program Association Table");
programs = gst_structure_id_get_value (old_pat, QUARK_PROGRAMS);
nbprograms = gst_value_list_get_size (programs);
for (i = 0; i < nbprograms; ++i) {
value = gst_value_list_get_value (programs, i);
program_info = g_value_get_boxed (value);
gst_structure_id_get (program_info,
QUARK_PROGRAM_NUMBER, G_TYPE_UINT, &program_number,
QUARK_PID, G_TYPE_UINT, &pid, NULL);
program = mpegts_base_get_program (base, program_number);
if (G_UNLIKELY (program == NULL)) {
GST_DEBUG_OBJECT (base, "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;
GST_INFO_OBJECT (base, "PAT removing program %" GST_PTR_FORMAT,
program_info);
mpegts_base_deactivate_program (base, program);
mpegts_base_remove_program (base, program_number);
/* FIXME: when this happens it may still be pmt pid of another
* program, so setting to False may make it go through expensive
* path in is_psi unnecessarily */
MPEGTS_BIT_SET (base->known_psi, pid);
mpegts_packetizer_remove_stream (base->packetizer, pid);
}
gst_structure_free (old_pat);
}
}
static void
mpegts_base_apply_pmt (MpegTSBase * base,
guint16 pmt_pid, GstStructure * pmt_info)
{
MpegTSBaseProgram *program, *old_program;
guint program_number;
gboolean initial_program = TRUE;
/* FIXME : not so sure this is valid anymore */
if (G_UNLIKELY (base->seen_pat == FALSE)) {
GST_WARNING ("Got pmt without pat first. Returning");
/* remove the stream since we won't get another PMT otherwise */
mpegts_packetizer_remove_stream (base->packetizer, pmt_pid);
return;
}
gst_structure_id_get (pmt_info, QUARK_PROGRAM_NUMBER, G_TYPE_UINT,
&program_number, NULL);
GST_DEBUG ("Applying PMT (program_number:%d, pid:0x%04x)",
program_number, pmt_pid);
/* In order for stream switching to happen properly in decodebin(2),
* we need to first add the new pads (i.e. activate the new program)
* before removing the old ones (i.e. deactivating the old program)
*/
old_program = mpegts_base_get_program (base, program_number);
if (G_UNLIKELY (old_program == NULL))
goto no_program;
if (G_UNLIKELY (mpegts_base_is_same_program (base, old_program, pmt_pid,
pmt_info)))
goto same_program;
/* If the current program is active, this means we have a new program */
if (old_program->active) {
old_program = mpegts_base_steal_program (base, program_number);
program = mpegts_base_new_program (base, program_number, pmt_pid);
g_hash_table_insert (base->programs,
GINT_TO_POINTER (program_number), program);
/* Desactivate the old program */
mpegts_base_deactivate_program (base, old_program);
mpegts_base_free_program (old_program);
initial_program = FALSE;
} else
program = old_program;
/* activate program */
/* Ownership of pmt_info is given to the program */
mpegts_base_activate_program (base, program, pmt_pid, pmt_info,
initial_program);
gst_element_post_message (GST_ELEMENT_CAST (base),
gst_message_new_element (GST_OBJECT (base),
gst_structure_copy (pmt_info)));
return;
no_program:
{
GST_ERROR ("Attempted to apply a PMT on a program that wasn't created");
gst_structure_free (pmt_info);
return;
}
same_program:
{
GST_DEBUG ("Not applying identical program");
gst_structure_free (pmt_info);
return;
}
}
static void
mpegts_base_apply_cat (MpegTSBase * base, GstStructure * cat_info)
{
GST_DEBUG_OBJECT (base, "CAT %" GST_PTR_FORMAT, cat_info);
gst_element_post_message (GST_ELEMENT_CAST (base),
gst_message_new_element (GST_OBJECT (base), cat_info));
}
static void
mpegts_base_apply_nit (MpegTSBase * base,
guint16 pmt_pid, GstStructure * nit_info)
{
GST_DEBUG_OBJECT (base, "NIT %" GST_PTR_FORMAT, nit_info);
gst_element_post_message (GST_ELEMENT_CAST (base),
gst_message_new_element (GST_OBJECT (base), nit_info));
}
static void
mpegts_base_apply_sdt (MpegTSBase * base,
guint16 pmt_pid, GstStructure * sdt_info)
{
GST_DEBUG_OBJECT (base, "SDT %" GST_PTR_FORMAT, sdt_info);
mpegts_base_get_tags_from_sdt (base, sdt_info);
gst_element_post_message (GST_ELEMENT_CAST (base),
gst_message_new_element (GST_OBJECT (base), sdt_info));
}
static void
mpegts_base_apply_eit (MpegTSBase * base,
guint16 pmt_pid, GstStructure * eit_info)
{
GST_DEBUG_OBJECT (base, "EIT %" GST_PTR_FORMAT, eit_info);
mpegts_base_get_tags_from_eit (base, eit_info);
gst_element_post_message (GST_ELEMENT_CAST (base),
gst_message_new_element (GST_OBJECT (base), eit_info));
}
static void
mpegts_base_apply_tdt (MpegTSBase * base,
guint16 tdt_pid, GstStructure * tdt_info)
{
gst_element_post_message (GST_ELEMENT_CAST (base),
gst_message_new_element (GST_OBJECT (base),
gst_structure_copy (tdt_info)));
GST_MPEGTS_BASE_GET_CLASS (base)->push_event (base,
gst_event_new_custom (GST_EVENT_CUSTOM_DOWNSTREAM, tdt_info));
}
gboolean
mpegts_base_handle_psi (MpegTSBase * base, MpegTSPacketizerSection * section)
{
gboolean res = TRUE;
GstStructure *structure = NULL;
/* table ids 0x70 - 0x73 do not have a crc (EN 300 468) */
/* table ids 0x75 - 0x77 do not have a crc (TS 102 323) */
/* table id 0x7e does not have a crc (EN 300 468) */
/* table ids 0x80 - 0x8f do not have a crc (CA_message section ETR 289) */
if (G_LIKELY ((section->table_id < 0x70 || section->table_id > 0x73)
&& (section->table_id < 0x75 || section->table_id > 0x77)
&& (section->table_id < 0x80 || section->table_id > 0x8f)
&& (section->table_id != 0x7e))) {
if (G_UNLIKELY (mpegts_base_calc_crc32 (section->data,
section->section_length) != 0)) {
GST_WARNING_OBJECT (base, "bad crc in psi pid 0x%04x (table_id:0x%02x)",
section->pid, section->table_id);
return FALSE;
}
}
GST_DEBUG ("Handling PSI (pid: 0x%04x , table_id: 0x%02x)",
section->pid, section->table_id);
switch (section->table_id) {
case TABLE_ID_PROGRAM_ASSOCIATION:
/* PAT */
structure = mpegts_packetizer_parse_pat (base->packetizer, section);
if (G_LIKELY (structure)) {
mpegts_base_apply_pat (base, structure);
if (base->seen_pat == FALSE) {
base->seen_pat = TRUE;
GST_DEBUG ("First PAT offset: %" G_GUINT64_FORMAT, section->offset);
mpegts_packetizer_set_reference_offset (base->packetizer,
section->offset);
}
} else
res = FALSE;
break;
case TABLE_ID_CONDITIONAL_ACCESS:
/* CAT */
structure = mpegts_packetizer_parse_cat (base->packetizer, section);
if (structure)
mpegts_base_apply_cat (base, structure);
else
res = FALSE;
break;
case TABLE_ID_TS_PROGRAM_MAP:
/* PMT */
structure = mpegts_packetizer_parse_pmt (base->packetizer, section);
if (G_LIKELY (structure))
mpegts_base_apply_pmt (base, section->pid, structure);
else
res = FALSE;
break;
case TABLE_ID_NETWORK_INFORMATION_ACTUAL_NETWORK:
/* NIT, actual network */
case TABLE_ID_NETWORK_INFORMATION_OTHER_NETWORK:
/* NIT, other network */
structure = mpegts_packetizer_parse_nit (base->packetizer, section);
if (G_LIKELY (structure))
mpegts_base_apply_nit (base, section->pid, structure);
else
res = FALSE;
break;
case TABLE_ID_SERVICE_DESCRIPTION_ACTUAL_TS:
case TABLE_ID_SERVICE_DESCRIPTION_OTHER_TS:
structure = mpegts_packetizer_parse_sdt (base->packetizer, section);
if (G_LIKELY (structure))
mpegts_base_apply_sdt (base, 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 */
/* FIXME : Can take up to 50% of total mpeg-ts demuxing cpu usage ! */
structure = mpegts_packetizer_parse_eit (base->packetizer, section);
if (G_LIKELY (structure))
mpegts_base_apply_eit (base, section->pid, structure);
else
res = FALSE;
break;
case TABLE_ID_TIME_DATE:
/* TDT (Time and Date table) */
structure = mpegts_packetizer_parse_tdt (base->packetizer, section);
if (G_LIKELY (structure))
mpegts_base_apply_tdt (base, section->pid, structure);
else
res = FALSE;
break;
case TABLE_ID_TIME_OFFSET:
/* TOT (Time Offset table) */
structure = mpegts_packetizer_parse_tot (base->packetizer, section);
if (G_LIKELY (structure))
mpegts_base_apply_tdt (base, section->pid, structure);
else
res = FALSE;
break;
default:
GST_WARNING ("Unhandled or unknown section type (table_id 0x%02x)",
section->table_id);
break;
}
return res;
}
static void
mpegts_base_get_tags_from_sdt (MpegTSBase * base, GstStructure * sdt_info)
{
const GValue *services;
guint i;
services = gst_structure_get_value (sdt_info, "services");
for (i = 0; i < gst_value_list_get_size (services); i++) {
const GstStructure *service;
const gchar *sid_str;
gchar *tmp;
gint program_number;
MpegTSBaseProgram *program;
service = gst_value_get_structure (gst_value_list_get_value (services, i));
/* get program_number from structure name
* which looks like service-%d */
sid_str = gst_structure_get_name (service);
tmp = g_strstr_len (sid_str, -1, "-");
if (!tmp)
continue;
program_number = atoi (++tmp);
program = mpegts_base_get_program (base, program_number);
if (program && !program->tags) {
program->tags = gst_tag_list_new (GST_TAG_ARTIST,
gst_structure_get_string (service, "name"), NULL);
}
}
}
static void
mpegts_base_get_tags_from_eit (MpegTSBase * base, GstStructure * eit_info)
{
const GValue *events;
guint i;
guint program_number;
MpegTSBaseProgram *program;
gboolean present_following;
gst_structure_get_uint (eit_info, "service-id", &program_number);
program = mpegts_base_get_program (base, program_number);
gst_structure_get_boolean (eit_info, "present-following", &present_following);
if (program && present_following) {
events = gst_structure_get_value (eit_info, "events");
for (i = 0; i < gst_value_list_get_size (events); i++) {
const GstStructure *event;
const gchar *title;
guint status;
guint event_id;
guint duration;
event = gst_value_get_structure (gst_value_list_get_value (events, i));
title = gst_structure_get_string (event, "name");
gst_structure_get_uint (event, "event-id", &event_id);
gst_structure_get_uint (event, "running-status", &status);
if (title && event_id != program->event_id
&& status == RUNNING_STATUS_RUNNING) {
gst_structure_get_uint (event, "duration", &duration);
program->event_id = event_id;
program->tags = gst_tag_list_new (GST_TAG_TITLE,
title, GST_TAG_DURATION, duration * GST_SECOND, NULL);
}
}
}
}
static gboolean
remove_each_program (gpointer key, MpegTSBaseProgram * program,
MpegTSBase * base)
{
/* First deactivate it */
mpegts_base_deactivate_program (base, program);
return TRUE;
}
static gboolean
gst_mpegts_base_handle_eos (MpegTSBase * base)
{
g_hash_table_foreach_remove (base->programs, (GHRFunc) remove_each_program,
base);
/* finally remove */
return TRUE;
}
static inline void
mpegts_base_flush (MpegTSBase * base)
{
MpegTSBaseClass *klass = GST_MPEGTS_BASE_GET_CLASS (base);
/* Call implementation */
if (G_UNLIKELY (klass->flush == NULL))
GST_WARNING_OBJECT (base, "Class doesn't have a 'flush' implementation !");
else
klass->flush (base);
}
static gboolean
mpegts_base_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
{
gboolean res = TRUE;
MpegTSBase *base = GST_MPEGTS_BASE (parent);
GST_DEBUG_OBJECT (base, "Got event %s",
gst_event_type_get_name (GST_EVENT_TYPE (event)));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_SEGMENT:
gst_event_copy_segment (event, &base->segment);
/* Check if we need to switch PCR/PTS handling */
if (base->segment.format == GST_FORMAT_TIME) {
base->packetizer->calculate_offset = FALSE;
base->packetizer->calculate_skew = TRUE;
} else {
base->packetizer->calculate_offset = TRUE;
base->packetizer->calculate_skew = FALSE;
}
res = GST_MPEGTS_BASE_GET_CLASS (base)->push_event (base, event);
break;
case GST_EVENT_STREAM_START:
gst_event_unref (event);
break;
case GST_EVENT_EOS:
res = GST_MPEGTS_BASE_GET_CLASS (base)->push_event (base, event);
res = gst_mpegts_base_handle_eos (base);
break;
case GST_EVENT_CAPS:
/* FIXME, do something */
gst_event_unref (event);
break;
case GST_EVENT_FLUSH_STOP:
res = GST_MPEGTS_BASE_GET_CLASS (base)->push_event (base, event);
mpegts_packetizer_flush (base->packetizer);
mpegts_base_flush (base);
gst_segment_init (&base->segment, GST_FORMAT_UNDEFINED);
base->seen_pat = FALSE;
break;
/* Passthrough */
default:
res = GST_MPEGTS_BASE_GET_CLASS (base)->push_event (base, event);
}
return res;
}
static void
query_upstream_latency (MpegTSBase * base)
{
GstQuery *query;
query = gst_query_new_latency ();
if (gst_pad_peer_query (base->sinkpad, query)) {
gst_query_parse_latency (query, &base->upstream_live, NULL, NULL);
GST_DEBUG_OBJECT (base, "Upstream is %s",
base->upstream_live ? "LIVE" : "NOT LIVE");
} else
GST_WARNING_OBJECT (base, "Failed to query upstream latency");
gst_query_unref (query);
base->queried_latency = TRUE;
}
static inline GstFlowReturn
mpegts_base_push (MpegTSBase * base, MpegTSPacketizerPacket * packet,
MpegTSPacketizerSection * section)
{
MpegTSBaseClass *klass = GST_MPEGTS_BASE_GET_CLASS (base);
/* Call implementation */
if (G_UNLIKELY (klass->push == NULL)) {
GST_ERROR_OBJECT (base, "Class doesn't have a 'push' implementation !");
return GST_FLOW_ERROR;
}
return klass->push (base, packet, section);
}
static GstFlowReturn
mpegts_base_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
{
GstFlowReturn res = GST_FLOW_OK;
MpegTSBase *base;
gboolean based;
MpegTSPacketizerPacketReturn pret;
MpegTSPacketizer2 *packetizer;
MpegTSPacketizerPacket packet;
MpegTSBaseClass *klass;
base = GST_MPEGTS_BASE (parent);
klass = GST_MPEGTS_BASE_GET_CLASS (base);
packetizer = base->packetizer;
if (G_UNLIKELY (base->queried_latency == FALSE)) {
query_upstream_latency (base);
}
if (klass->input_done)
gst_buffer_ref (buf);
mpegts_packetizer_push (base->packetizer, buf);
while (res == GST_FLOW_OK) {
pret = mpegts_packetizer_next_packet (base->packetizer, &packet);
/* If we don't have enough data, return */
if (G_UNLIKELY (pret == PACKET_NEED_MORE))
break;
if (G_UNLIKELY (pret == PACKET_BAD)) {
/* bad header, skip the packet */
GST_DEBUG_OBJECT (base, "bad packet, skipping");
goto next;
}
/* FIXME : Handle the case where we have multiple sections in one
* packet !
* See bug #677443
*/
/* base PSI data */
if (packet.payload != NULL && mpegts_base_is_psi (base, &packet)) {
MpegTSPacketizerSection section;
based = mpegts_packetizer_push_section (packetizer, &packet, &section);
if (G_UNLIKELY (!based))
/* bad section data */
goto next;
if (G_LIKELY (section.complete)) {
/* section complete */
based = mpegts_base_handle_psi (base, &section);
if (G_UNLIKELY (!based)) {
/* bad PSI table */
goto next;
}
}
/* we need to push section packet downstream */
res = mpegts_base_push (base, &packet, &section);
} else if (MPEGTS_BIT_IS_SET (base->is_pes, packet.pid)) {
/* push the packet downstream */
res = mpegts_base_push (base, &packet, NULL);
}
next:
mpegts_packetizer_clear_packet (base->packetizer, &packet);
}
if (klass->input_done) {
if (res == GST_FLOW_OK)
res = klass->input_done (base, buf);
else
gst_buffer_unref (buf);
}
return res;
}
static GstFlowReturn
mpegts_base_scan (MpegTSBase * base)
{
GstFlowReturn ret = GST_FLOW_OK;
GstBuffer *buf = NULL;
guint i;
gboolean done = FALSE;
MpegTSPacketizerPacketReturn pret;
gint64 tmpval;
guint64 upstream_size, seek_pos;
GstFormat format;
guint initial_pcr_seen;
GST_DEBUG ("Scanning for initial sync point");
/* Find initial sync point and at least 5 PCR values */
for (i = 0; i < 10 && !done; i++) {
GST_DEBUG ("Grabbing %d => %d", i * 65536, 65536);
ret = gst_pad_pull_range (base->sinkpad, i * 65536, 65536, &buf);
if (G_UNLIKELY (ret != GST_FLOW_OK))
goto beach;
/* Push to packetizer */
mpegts_packetizer_push (base->packetizer, buf);
buf = NULL;
if (mpegts_packetizer_has_packets (base->packetizer)) {
if (base->seek_offset == -1) {
/* Mark the initial sync point and remember the packetsize */
base->seek_offset = base->packetizer->offset;
GST_DEBUG ("Sync point is now %" G_GUINT64_FORMAT, base->seek_offset);
base->packetsize = base->packetizer->packet_size;
}
while (1) {
/* Eat up all packets */
pret = mpegts_packetizer_process_next_packet (base->packetizer);
if (pret == PACKET_NEED_MORE)
break;
if (pret != PACKET_BAD &&
mpegts_packetizer_get_seen_pcr (base->packetizer) >= 5) {
GST_DEBUG ("Got enough initial PCR");
done = TRUE;
break;
}
}
}
}
initial_pcr_seen = mpegts_packetizer_get_seen_pcr (base->packetizer);
if (G_UNLIKELY (initial_pcr_seen == 0))
goto no_initial_pcr;
GST_DEBUG ("Seen %d initial PCR", initial_pcr_seen);
/* Now send data from the end */
mpegts_packetizer_clear (base->packetizer);
/* Get the size of upstream */
format = GST_FORMAT_BYTES;
if (!gst_pad_peer_query_duration (base->sinkpad, format, &tmpval))
goto beach;
upstream_size = tmpval;
done = FALSE;
/* Find last PCR value */
for (seek_pos = MAX (0, upstream_size - 655360);
seek_pos < upstream_size && !done; seek_pos += 65536) {
GST_DEBUG ("Grabbing %" G_GUINT64_FORMAT " => %d", seek_pos, 65536);
ret = gst_pad_pull_range (base->sinkpad, seek_pos, 65536, &buf);
if (G_UNLIKELY (ret != GST_FLOW_OK))
goto beach;
/* Push to packetizer */
mpegts_packetizer_push (base->packetizer, buf);
buf = NULL;
if (mpegts_packetizer_has_packets (base->packetizer)) {
while (1) {
/* Eat up all packets */
pret = mpegts_packetizer_process_next_packet (base->packetizer);
if (pret == PACKET_NEED_MORE)
break;
if (pret != PACKET_BAD &&
mpegts_packetizer_get_seen_pcr (base->packetizer) >
initial_pcr_seen) {
GST_DEBUG ("Got last PCR");
done = TRUE;
break;
}
}
}
}
beach:
mpegts_packetizer_clear (base->packetizer);
return ret;
no_initial_pcr:
mpegts_packetizer_clear (base->packetizer);
GST_WARNING_OBJECT (base, "Couldn't find any PCR within the first %d bytes",
10 * 65536);
return GST_FLOW_ERROR;
}
static void
mpegts_base_loop (MpegTSBase * base)
{
GstFlowReturn ret = GST_FLOW_ERROR;
switch (base->mode) {
case BASE_MODE_SCANNING:
/* Find first sync point */
ret = mpegts_base_scan (base);
if (G_UNLIKELY (ret != GST_FLOW_OK))
goto error;
base->mode = BASE_MODE_STREAMING;
GST_DEBUG ("Changing to Streaming");
break;
case BASE_MODE_SEEKING:
/* FIXME : unclear if we still need mode_seeking... */
base->mode = BASE_MODE_STREAMING;
break;
case BASE_MODE_STREAMING:
{
GstBuffer *buf = NULL;
GST_DEBUG ("Pulling data from %" G_GUINT64_FORMAT, base->seek_offset);
ret = gst_pad_pull_range (base->sinkpad, base->seek_offset,
100 * base->packetsize, &buf);
if (G_UNLIKELY (ret != GST_FLOW_OK))
goto error;
base->seek_offset += gst_buffer_get_size (buf);
ret = mpegts_base_chain (base->sinkpad, GST_OBJECT_CAST (base), buf);
if (G_UNLIKELY (ret != GST_FLOW_OK))
goto error;
}
break;
case BASE_MODE_PUSHING:
GST_WARNING ("wrong BASE_MODE_PUSHING mode in pull loop");
break;
}
return;
error:
{
const gchar *reason = gst_flow_get_name (ret);
GST_DEBUG_OBJECT (base, "Pausing task, reason %s", reason);
if (ret == GST_FLOW_EOS) {
GST_MPEGTS_BASE_GET_CLASS (base)->push_event (base, gst_event_new_eos ());
} else if (ret == GST_FLOW_NOT_LINKED || ret < GST_FLOW_EOS) {
GST_ELEMENT_ERROR (base, STREAM, FAILED,
(_("Internal data stream error.")),
("stream stopped, reason %s", reason));
GST_MPEGTS_BASE_GET_CLASS (base)->push_event (base, gst_event_new_eos ());
}
gst_pad_pause_task (base->sinkpad);
}
}
gboolean
mpegts_base_handle_seek_event (MpegTSBase * base, GstPad * pad,
GstEvent * event)
{
MpegTSBaseClass *klass = GST_MPEGTS_BASE_GET_CLASS (base);
GstFlowReturn ret = GST_FLOW_ERROR;
gdouble rate;
gboolean flush;
GstFormat format;
GstSeekFlags flags;
GstSeekType start_type, stop_type;
gint64 start, stop;
gst_event_parse_seek (event, &rate, &format, &flags, &start_type, &start,
&stop_type, &stop);
if (format != GST_FORMAT_TIME)
return FALSE;
if (base->mode == BASE_MODE_PUSHING) {
/* First try if upstream supports seeking in TIME format */
if (gst_pad_push_event (base->sinkpad, gst_event_ref (event))) {
GST_DEBUG ("upstream handled SEEK event");
return TRUE;
}
/* FIXME : Actually ... it is supported, we just need to convert
* the seek event to BYTES */
GST_ERROR ("seeking in push mode not supported");
goto push_mode;
}
GST_DEBUG ("seek event, rate: %f start: %" GST_TIME_FORMAT
" stop: %" GST_TIME_FORMAT, rate, GST_TIME_ARGS (start),
GST_TIME_ARGS (stop));
flush = flags & GST_SEEK_FLAG_FLUSH;
/* stop streaming, either by flushing or by pausing the task */
base->mode = BASE_MODE_SEEKING;
if (flush) {
GST_DEBUG_OBJECT (base, "sending flush start");
gst_pad_push_event (base->sinkpad, gst_event_new_flush_start ());
GST_MPEGTS_BASE_GET_CLASS (base)->push_event (base,
gst_event_new_flush_start ());
} else
gst_pad_pause_task (base->sinkpad);
/* wait for streaming to finish */
GST_PAD_STREAM_LOCK (base->sinkpad);
if (flush) {
/* send a FLUSH_STOP for the sinkpad, since we need data for seeking */
GST_DEBUG_OBJECT (base, "sending flush stop");
gst_pad_push_event (base->sinkpad, gst_event_new_flush_stop (TRUE));
/* And actually flush our pending data */
mpegts_base_flush (base);
mpegts_packetizer_flush (base->packetizer);
}
if (flags & (GST_SEEK_FLAG_SEGMENT | GST_SEEK_FLAG_SKIP)) {
GST_WARNING ("seek flags 0x%x are not supported", (int) flags);
goto done;
}
if (format == GST_FORMAT_TIME) {
/* If the subclass can seek, do that */
if (klass->seek) {
ret = klass->seek (base, event);
if (G_UNLIKELY (ret != GST_FLOW_OK)) {
GST_WARNING ("seeking failed %s", gst_flow_get_name (ret));
}
} else {
GST_WARNING ("subclass has no seek implementation");
}
}
if (flush) {
/* if we sent a FLUSH_START, we now send a FLUSH_STOP */
GST_DEBUG_OBJECT (base, "sending flush stop");
//gst_pad_push_event (base->sinkpad, gst_event_new_flush_stop ());
GST_MPEGTS_BASE_GET_CLASS (base)->push_event (base,
gst_event_new_flush_stop (TRUE));
}
//else
done:
gst_pad_start_task (base->sinkpad, (GstTaskFunction) mpegts_base_loop, base,
NULL);
push_mode:
GST_PAD_STREAM_UNLOCK (base->sinkpad);
return ret == GST_FLOW_OK;
}
static gboolean
mpegts_base_sink_activate (GstPad * sinkpad, GstObject * parent)
{
GstQuery *query;
gboolean pull_mode;
query = gst_query_new_scheduling ();
if (!gst_pad_peer_query (sinkpad, query)) {
gst_query_unref (query);
goto activate_push;
}
pull_mode = gst_query_has_scheduling_mode_with_flags (query,
GST_PAD_MODE_PULL, GST_SCHEDULING_FLAG_SEEKABLE);
gst_query_unref (query);
if (!pull_mode)
goto activate_push;
GST_DEBUG_OBJECT (sinkpad, "activating pull");
return gst_pad_activate_mode (sinkpad, GST_PAD_MODE_PULL, TRUE);
activate_push:
{
GST_DEBUG_OBJECT (sinkpad, "activating push");
return gst_pad_activate_mode (sinkpad, GST_PAD_MODE_PUSH, TRUE);
}
}
static gboolean
mpegts_base_sink_activate_mode (GstPad * pad, GstObject * parent,
GstPadMode mode, gboolean active)
{
gboolean res;
MpegTSBase *base = GST_MPEGTS_BASE (parent);
switch (mode) {
case GST_PAD_MODE_PUSH:
base->mode = BASE_MODE_PUSHING;
res = TRUE;
break;
case GST_PAD_MODE_PULL:
if (active) {
base->mode = BASE_MODE_SCANNING;
/* When working pull-based, we always use offsets for estimation */
base->packetizer->calculate_offset = TRUE;
base->packetizer->calculate_skew = FALSE;
res =
gst_pad_start_task (pad, (GstTaskFunction) mpegts_base_loop, base,
NULL);
} else
res = gst_pad_stop_task (pad);
break;
default:
res = FALSE;
break;
}
return res;
}
static GstStateChangeReturn
mpegts_base_change_state (GstElement * element, GstStateChange transition)
{
MpegTSBase *base;
GstStateChangeReturn ret;
base = GST_MPEGTS_BASE (element);
switch (transition) {
case GST_STATE_CHANGE_READY_TO_PAUSED:
mpegts_base_reset (base);
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_READY:
mpegts_base_reset (base);
if (base->mode != BASE_MODE_PUSHING)
base->mode = BASE_MODE_SCANNING;
break;
default:
break;
}
return ret;
}
gboolean
gst_mpegtsbase_plugin_init (GstPlugin * plugin)
{
GST_DEBUG_CATEGORY_INIT (mpegts_base_debug, "mpegtsbase", 0,
"MPEG transport stream base class");
gst_mpegtsdesc_init_debug ();
return TRUE;
}
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