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gstreamer/gst/mpegdemux/gstmpegtsdemux.c
Edward Hervey ddcd0e60b1 mpegtsdemux: Reset stream->last_time when flushing. 
This fixes naive seeking a tiny bit (by basically hinting at _data_cb
that it shouldn't expect the incoming buffers to be the ones just after
the previous ones).

Without this, seeking by more than 10mins forward would just end up in an
endless loop.
2009-09-11 15:18:58 +02:00

3222 lines
104 KiB
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/*
* This library is licensed under 2 different licenses and you
* can choose to use it under the terms of either one of them. The
* two licenses are the MPL 1.1 and the LGPL.
*
* MPL:
*
* The contents of this file are subject to the Mozilla Public License
* Version 1.1 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/.
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
* License for the specific language governing rights and limitations
* under the License.
*
* LGPL:
*
* 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.
*
* The Original Code is Fluendo MPEG Demuxer plugin.
*
* The Initial Developer of the Original Code is Fluendo, S.A.
* Portions created by Fluendo, S.L. are Copyright (C) 2005,2006,2007,2008,2009
* Fluendo, S.A. All Rights Reserved.
*
* Contributor(s): Wim Taymans <wim@fluendo.com>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <stdlib.h>
#include <liboil/liboil.h>
#include "gstmpegdefs.h"
#include "gstmpegtsdemux.h"
#include "flutspatinfo.h"
#include "flutspmtinfo.h"
GST_DEBUG_CATEGORY_STATIC (gstmpegtsdemux_debug);
#define GST_CAT_DEFAULT (gstmpegtsdemux_debug)
/* elementfactory information */
#ifndef __always_inline
#if (__GNUC__ > 3) || (__GNUC__ == 3 && __GNUC_MINOR__ >= 1)
#define __always_inline inline __attribute__((always_inline))
#else
#define __always_inline inline
#endif
#endif
#ifndef DISABLE_INLINE
#define FORCE_INLINE __always_inline
#else
#define FORCE_INLINE
#endif
static GstElementDetails mpegts_demux_details = {
"The Fluendo MPEG Transport stream demuxer",
"Codec/Demuxer",
"Demultiplexes MPEG2 Transport Streams",
"Wim Taymans <wim@fluendo.com>"
};
/* MPEG2Demux signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
#define DEFAULT_PROP_ES_PIDS ""
#define DEFAULT_PROP_CHECK_CRC TRUE
#define DEFAULT_PROP_PROGRAM_NUMBER -1
/* latency in mseconds */
#define TS_LATENCY 700
enum
{
PROP_0,
PROP_ES_PIDS,
PROP_CHECK_CRC,
PROP_PROGRAM_NUMBER,
PROP_PAT_INFO,
PROP_PMT_INFO,
};
#define GSTTIME_TO_BYTES(time) \
((time != -1) ? gst_util_uint64_scale (MAX(0,(gint64) ((time))), \
demux->bitrate, GST_SECOND) : -1)
#define BYTES_TO_GSTTIME(bytes) \
((bytes != -1) ? (gst_util_uint64_scale (bytes, GST_SECOND, \
demux->bitrate)) : -1)
#define VIDEO_CAPS \
GST_STATIC_CAPS (\
"video/mpeg, " \
"mpegversion = (int) { 1, 2, 4 }, " \
"systemstream = (boolean) FALSE; " \
"video/x-h264;" \
"video/x-dirac;" \
"video/x-wmv," \
"wmvversion = (int) 3, " \
"format = (fourcc) WVC1" \
)
#define AUDIO_CAPS \
GST_STATIC_CAPS ( \
"audio/mpeg, " \
"mpegversion = (int) { 1, 4 };" \
"audio/x-lpcm, " \
"width = (int) { 16, 20, 24 }, " \
"rate = (int) { 48000, 96000 }, " \
"channels = (int) [ 1, 8 ], " \
"dynamic_range = (int) [ 0, 255 ], " \
"emphasis = (boolean) { FALSE, TRUE }, " \
"mute = (boolean) { FALSE, TRUE }; " \
"audio/x-ac3; audio/x-eac3;" \
"audio/x-dts;" \
"audio/x-private-ts-lpcm" \
)
/* Can also use the subpicture pads for text subtitles? */
#define SUBPICTURE_CAPS \
GST_STATIC_CAPS ("subpicture/x-pgs; video/x-dvd-subpicture")
static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/mpegts")
);
static GstStaticPadTemplate video_template =
GST_STATIC_PAD_TEMPLATE ("video_%04x",
GST_PAD_SRC,
GST_PAD_SOMETIMES,
VIDEO_CAPS);
static GstStaticPadTemplate audio_template =
GST_STATIC_PAD_TEMPLATE ("audio_%04x",
GST_PAD_SRC,
GST_PAD_SOMETIMES,
AUDIO_CAPS);
static GstStaticPadTemplate subpicture_template =
GST_STATIC_PAD_TEMPLATE ("subpicture_%04x",
GST_PAD_SRC,
GST_PAD_SOMETIMES,
SUBPICTURE_CAPS);
static GstStaticPadTemplate private_template =
GST_STATIC_PAD_TEMPLATE ("private_%04x",
GST_PAD_SRC,
GST_PAD_SOMETIMES,
GST_STATIC_CAPS_ANY);
static void gst_mpegts_demux_base_init (GstMpegTSDemuxClass * klass);
static void gst_mpegts_demux_class_init (GstMpegTSDemuxClass * klass);
static void gst_mpegts_demux_init (GstMpegTSDemux * demux);
static void gst_mpegts_demux_finalize (GstMpegTSDemux * demux);
static void gst_mpegts_demux_reset (GstMpegTSDemux * demux);
//static void gst_mpegts_demux_remove_pads (GstMpegTSDemux * demux);
static void gst_mpegts_demux_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_mpegts_demux_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static gboolean gst_mpegts_demux_is_PMT (GstMpegTSDemux * demux, guint16 PID);
static gboolean gst_mpegts_demux_sink_event (GstPad * pad, GstEvent * event);
static gboolean gst_mpegts_demux_src_event (GstPad * pad, GstEvent * event);
static GstFlowReturn gst_mpegts_demux_chain (GstPad * pad, GstBuffer * buffer);
static gboolean gst_mpegts_demux_sink_setcaps (GstPad * pad, GstCaps * caps);
static GstClock *gst_mpegts_demux_provide_clock (GstElement * element);
static gboolean gst_mpegts_demux_src_pad_query (GstPad * pad, GstQuery * query);
static const GstQueryType *gst_mpegts_demux_src_pad_query_type (GstPad * pad);
static GstStateChangeReturn gst_mpegts_demux_change_state (GstElement * element,
GstStateChange transition);
static MpegTsPmtInfo *mpegts_demux_build_pmt_info (GstMpegTSDemux * demux,
guint16 pmt_pid);
static GstElementClass *parent_class = NULL;
/*static guint gst_mpegts_demux_signals[LAST_SIGNAL] = { 0 };*/
GType
gst_mpegts_demux_get_type (void)
{
static GType mpegts_demux_type = 0;
if (G_UNLIKELY (!mpegts_demux_type)) {
static const GTypeInfo mpegts_demux_info = {
sizeof (GstMpegTSDemuxClass),
(GBaseInitFunc) gst_mpegts_demux_base_init,
NULL,
(GClassInitFunc) gst_mpegts_demux_class_init,
NULL,
NULL,
sizeof (GstMpegTSDemux),
0,
(GInstanceInitFunc) gst_mpegts_demux_init,
};
mpegts_demux_type =
g_type_register_static (GST_TYPE_ELEMENT, "GstMpegTSDemux",
&mpegts_demux_info, 0);
GST_DEBUG_CATEGORY_INIT (gstmpegtsdemux_debug, "mpegtsdemux", 0,
"MPEG program stream demultiplexer element");
}
return mpegts_demux_type;
}
static void
gst_mpegts_demux_base_init (GstMpegTSDemuxClass * klass)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
klass->sink_template = gst_static_pad_template_get (&sink_template);
klass->video_template = gst_static_pad_template_get (&video_template);
klass->audio_template = gst_static_pad_template_get (&audio_template);
klass->subpicture_template =
gst_static_pad_template_get (&subpicture_template);
klass->private_template = gst_static_pad_template_get (&private_template);
gst_element_class_add_pad_template (element_class, klass->video_template);
gst_element_class_add_pad_template (element_class, klass->audio_template);
gst_element_class_add_pad_template (element_class,
klass->subpicture_template);
gst_element_class_add_pad_template (element_class, klass->private_template);
gst_element_class_add_pad_template (element_class, klass->sink_template);
gst_element_class_set_details (element_class, &mpegts_demux_details);
}
static void
gst_mpegts_demux_class_init (GstMpegTSDemuxClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
parent_class = g_type_class_peek_parent (klass);
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
gobject_class->finalize = (GObjectFinalizeFunc) gst_mpegts_demux_finalize;
gobject_class->set_property = gst_mpegts_demux_set_property;
gobject_class->get_property = gst_mpegts_demux_get_property;
g_object_class_install_property (gobject_class, PROP_ES_PIDS,
g_param_spec_string ("es-pids",
"Colon separated list of PIDs containing Elementary Streams",
"PIDs to treat as Elementary Streams in the absence of a PMT, "
"eg 0x10:0x11:0x20", DEFAULT_PROP_ES_PIDS, G_PARAM_READWRITE));
g_object_class_install_property (gobject_class, PROP_CHECK_CRC,
g_param_spec_boolean ("check-crc", "Check CRC",
"Enable CRC checking", DEFAULT_PROP_CHECK_CRC, G_PARAM_READWRITE));
g_object_class_install_property (gobject_class, PROP_PROGRAM_NUMBER,
g_param_spec_int ("program-number", "Program Number",
"Program number to demux for (-1 to ignore)", -1, G_MAXINT,
DEFAULT_PROP_PROGRAM_NUMBER, G_PARAM_READWRITE));
g_object_class_install_property (gobject_class, PROP_PAT_INFO,
g_param_spec_value_array ("pat-info",
"GValueArray containing GObjects with properties",
"Array of GObjects containing information from the TS PAT "
"about all programs listed in the current Program Association "
"Table (PAT)",
g_param_spec_object ("flu-pat-streaminfo", "FluPATStreamInfo",
"Fluendo TS Demuxer PAT Stream info object",
MPEGTS_TYPE_PAT_INFO, G_PARAM_READABLE), G_PARAM_READABLE));
g_object_class_install_property (gobject_class, PROP_PMT_INFO,
g_param_spec_object ("pmt-info",
"Information about the current program",
"GObject with properties containing information from the TS PMT "
"about the currently selected program and its streams",
MPEGTS_TYPE_PMT_INFO, G_PARAM_READABLE));
gstelement_class->change_state = gst_mpegts_demux_change_state;
gstelement_class->provide_clock = gst_mpegts_demux_provide_clock;
}
static void
gst_mpegts_demux_init (GstMpegTSDemux * demux)
{
GstMpegTSDemuxClass *klass = GST_MPEGTS_DEMUX_GET_CLASS (demux);
demux->streams =
g_malloc0 (sizeof (GstMpegTSStream *) * (MPEGTS_MAX_PID + 1));
demux->sinkpad = gst_pad_new_from_template (klass->sink_template, "sink");
gst_pad_set_chain_function (demux->sinkpad, gst_mpegts_demux_chain);
gst_pad_set_event_function (demux->sinkpad, gst_mpegts_demux_sink_event);
gst_pad_set_setcaps_function (demux->sinkpad, gst_mpegts_demux_sink_setcaps);
gst_element_add_pad (GST_ELEMENT (demux), demux->sinkpad);
demux->elementary_pids = NULL;
demux->nb_elementary_pids = 0;
demux->check_crc = DEFAULT_PROP_CHECK_CRC;
demux->program_number = DEFAULT_PROP_PROGRAM_NUMBER;
demux->sync_lut = NULL;
demux->sync_lut_len = 0;
demux->bitrate = -1;
demux->num_packets = 0;
demux->pcr[0] = -1;
demux->pcr[1] = -1;
demux->cache_duration = GST_CLOCK_TIME_NONE;
demux->base_pts = GST_CLOCK_TIME_NONE;
oil_init ();
}
static void
gst_mpegts_demux_finalize (GstMpegTSDemux * demux)
{
gst_mpegts_demux_reset (demux);
g_free (demux->streams);
G_OBJECT_CLASS (parent_class)->finalize (G_OBJECT (demux));
}
static void
gst_mpegts_demux_reset (GstMpegTSDemux * demux)
{
/* Clean up the streams and pads we allocated */
gint i;
for (i = 0; i < MPEGTS_MAX_PID + 1; i++) {
GstMpegTSStream *stream = demux->streams[i];
if (stream != NULL) {
if (stream->pad)
gst_element_remove_pad (GST_ELEMENT_CAST (demux), stream->pad);
if (stream->ES_info)
gst_mpeg_descriptor_free (stream->ES_info);
if (stream->PMT.entries)
g_array_free (stream->PMT.entries, TRUE);
if (stream->PMT.program_info)
gst_mpeg_descriptor_free (stream->PMT.program_info);
if (stream->PAT.entries)
g_array_free (stream->PAT.entries, TRUE);
switch (stream->PID_type) {
case PID_TYPE_ELEMENTARY:
gst_pes_filter_uninit (&stream->filter);
break;
case PID_TYPE_PROGRAM_ASSOCIATION:
case PID_TYPE_CONDITIONAL_ACCESS:
case PID_TYPE_PROGRAM_MAP:
gst_section_filter_uninit (&stream->section_filter);
break;
}
if (stream->pes_buffer) {
gst_buffer_unref (stream->pes_buffer);
stream->pes_buffer = NULL;
}
g_free (stream);
demux->streams[i] = NULL;
}
}
if (demux->clock) {
g_object_unref (demux->clock);
demux->clock = NULL;
}
}
#if 0
static void
gst_mpegts_demux_remove_pads (GstMpegTSDemux * demux)
{
/* remove pads we added in preparation for adding new ones */
/* FIXME: instead of walking all streams, we should retain a list only
* of streams that have added pads */
gint i;
if (demux->need_no_more_pads) {
gst_element_no_more_pads ((GstElement *) demux);
demux->need_no_more_pads = FALSE;
}
for (i = 0; i < MPEGTS_MAX_PID + 1; i++) {
GstMpegTSStream *stream = demux->streams[i];
if (stream != NULL) {
if (GST_IS_PAD (stream->pad)) {
gst_pad_push_event (stream->pad, gst_event_new_eos ());
gst_element_remove_pad (GST_ELEMENT_CAST (demux), stream->pad);
}
stream->pad = NULL;
if (stream->PID_type == PID_TYPE_ELEMENTARY)
gst_pes_filter_drain (&stream->filter);
}
}
}
#endif
static 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
};
/*This function fills the value of negotiated packetsize at sinkpad*/
static gboolean
gst_mpegts_demux_sink_setcaps (GstPad * pad, GstCaps * caps)
{
GstMpegTSDemux *demux = GST_MPEGTS_DEMUX (gst_pad_get_parent (pad));
GstStructure *structure = NULL;
structure = gst_caps_get_structure (caps, 0);
GST_DEBUG_OBJECT (demux, "setcaps called with %" GST_PTR_FORMAT, caps);
if (!gst_structure_get_int (structure, "packetsize", &demux->packetsize)) {
GST_DEBUG_OBJECT (demux, "packetsize parameter not found in sink caps");
}
gst_object_unref (demux);
return TRUE;
}
static FORCE_INLINE guint32
gst_mpegts_demux_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 FORCE_INLINE gboolean
gst_mpegts_is_dirac_stream (GstMpegTSStream * stream)
{
gboolean is_dirac = FALSE;
if (stream->stream_type != ST_VIDEO_DIRAC)
return FALSE;
if (stream->ES_info != NULL) {
guint8 *dirac_desc;
/* Check for a Registration Descriptor to confirm this is dirac */
dirac_desc = gst_mpeg_descriptor_find (stream->ES_info, DESC_REGISTRATION);
if (dirac_desc != NULL && DESC_LENGTH (dirac_desc) >= 4) {
if (DESC_REGISTRATION_format_identifier (dirac_desc) == 0x64726163) { /* 'drac' in hex */
is_dirac = TRUE;
}
} else {
/* Check for old mapping as originally specified too */
dirac_desc = gst_mpeg_descriptor_find (stream->ES_info,
DESC_DIRAC_TC_PRIVATE);
if (dirac_desc != NULL && DESC_LENGTH (dirac_desc) == 0)
is_dirac = TRUE;
}
}
return is_dirac;
}
static FORCE_INLINE gboolean
gst_mpegts_stream_is_video (GstMpegTSStream * stream)
{
switch (stream->stream_type) {
case ST_VIDEO_MPEG1:
case ST_VIDEO_MPEG2:
case ST_VIDEO_MPEG4:
case ST_VIDEO_H264:
return TRUE;
case ST_VIDEO_DIRAC:
return gst_mpegts_is_dirac_stream (stream);
}
return FALSE;
}
static gboolean
gst_mpegts_demux_is_reserved_PID (GstMpegTSDemux * demux, guint16 PID)
{
return (PID >= PID_RESERVED_FIRST) && (PID < PID_RESERVED_LAST);
}
/* This function assumes that provided PID never will be greater than
* MPEGTS_MAX_PID (13 bits), this is currently guaranteed as everywhere in
* the code recovered PID at maximum is 13 bits long.
*/
static FORCE_INLINE GstMpegTSStream *
gst_mpegts_demux_get_stream_for_PID (GstMpegTSDemux * demux, guint16 PID)
{
GstMpegTSStream *stream = NULL;
stream = demux->streams[PID];
if (G_UNLIKELY (stream == NULL)) {
stream = g_new0 (GstMpegTSStream, 1);
stream->demux = demux;
stream->PID = PID;
stream->pad = NULL;
stream->base_PCR = -1;
stream->last_PCR = -1;
stream->last_PCR_difference = -1;
stream->PMT.version_number = -1;
stream->PAT.version_number = -1;
stream->PMT_pid = MPEGTS_MAX_PID + 1;
stream->flags |= MPEGTS_STREAM_FLAG_STREAM_TYPE_UNKNOWN;
stream->pes_buffer_in_sync = FALSE;
switch (PID) {
/* check for fixed mapping */
case PID_PROGRAM_ASSOCIATION_TABLE:
stream->PID_type = PID_TYPE_PROGRAM_ASSOCIATION;
/* initialise section filter */
gst_section_filter_init (&stream->section_filter);
break;
case PID_CONDITIONAL_ACCESS_TABLE:
stream->PID_type = PID_TYPE_CONDITIONAL_ACCESS;
/* initialise section filter */
gst_section_filter_init (&stream->section_filter);
break;
case PID_NULL_PACKET:
stream->PID_type = PID_TYPE_NULL_PACKET;
break;
default:
/* mark reserved PIDs */
if (gst_mpegts_demux_is_reserved_PID (demux, PID)) {
stream->PID_type = PID_TYPE_RESERVED;
} else {
/* check if PMT found in PAT */
if (gst_mpegts_demux_is_PMT (demux, PID)) {
stream->PID_type = PID_TYPE_PROGRAM_MAP;
/* initialise section filter */
gst_section_filter_init (&stream->section_filter);
} else
stream->PID_type = PID_TYPE_UNKNOWN;
}
break;
}
GST_DEBUG_OBJECT (demux, "creating stream %p for PID 0x%04x, PID_type %d",
stream, PID, stream->PID_type);
demux->streams[PID] = stream;
}
return stream;
}
static gboolean
gst_mpegts_demux_fill_stream (GstMpegTSStream * stream, guint8 id,
guint8 stream_type)
{
GstPadTemplate *template;
gchar *name;
GstMpegTSDemuxClass *klass;
GstMpegTSDemux *demux;
GstCaps *caps;
if (stream->stream_type && stream->stream_type != stream_type)
goto wrong_type;
demux = stream->demux;
klass = GST_MPEGTS_DEMUX_GET_CLASS (demux);
name = NULL;
template = NULL;
caps = NULL;
switch (stream_type) {
case ST_VIDEO_MPEG1:
case ST_VIDEO_MPEG2:
template = klass->video_template;
name = g_strdup_printf ("video_%04x", stream->PID);
caps = gst_caps_new_simple ("video/mpeg",
"mpegversion", G_TYPE_INT, stream_type == ST_VIDEO_MPEG1 ? 1 : 2,
"systemstream", G_TYPE_BOOLEAN, FALSE, NULL);
break;
case ST_AUDIO_MPEG1:
case ST_AUDIO_MPEG2:
template = klass->audio_template;
name = g_strdup_printf ("audio_%04x", stream->PID);
caps = gst_caps_new_simple ("audio/mpeg",
"mpegversion", G_TYPE_INT, 1, NULL);
break;
case ST_PRIVATE_DATA:
/* check if there is an AC3 descriptor associated with this stream
* from the PMT */
if (gst_mpeg_descriptor_find (stream->ES_info, DESC_DVB_AC3)) {
template = klass->audio_template;
name = g_strdup_printf ("audio_%04x", stream->PID);
caps = gst_caps_new_simple ("audio/x-ac3", NULL);
} else if (gst_mpeg_descriptor_find (stream->ES_info, DESC_DVB_TELETEXT)) {
template = klass->private_template;
name = g_strdup_printf ("private_%04x", stream->PID);
caps = gst_caps_new_simple ("private/teletext", NULL);
}
break;
case ST_HDV_AUX_V:
template = klass->private_template;
name = g_strdup_printf ("private_%04x", stream->PID);
caps = gst_caps_new_simple ("hdv/aux-v", NULL);
break;
case ST_HDV_AUX_A:
template = klass->private_template;
name = g_strdup_printf ("private_%04x", stream->PID);
caps = gst_caps_new_simple ("hdv/aux-a", NULL);
break;
case ST_PRIVATE_SECTIONS:
case ST_MHEG:
case ST_DSMCC:
break;
case ST_AUDIO_AAC:
template = klass->audio_template;
name = g_strdup_printf ("audio_%04x", stream->PID);
caps = gst_caps_new_simple ("audio/mpeg",
"mpegversion", G_TYPE_INT, 4, NULL);
break;
case ST_VIDEO_MPEG4:
template = klass->video_template;
name = g_strdup_printf ("video_%04x", stream->PID);
caps = gst_caps_new_simple ("video/mpeg",
"mpegversion", G_TYPE_INT, 4,
"systemstream", G_TYPE_BOOLEAN, FALSE, NULL);
break;
case ST_VIDEO_H264:
template = klass->video_template;
name = g_strdup_printf ("video_%04x", stream->PID);
caps = gst_caps_new_simple ("video/x-h264", NULL);
break;
case ST_VIDEO_DIRAC:
if (gst_mpegts_is_dirac_stream (stream)) {
template = klass->video_template;
name = g_strdup_printf ("video_%04x", stream->PID);
caps = gst_caps_new_simple ("video/x-dirac", NULL);
}
break;
case ST_PRIVATE_EA: /* Try to detect a VC1 stream */
{
guint8 *desc = NULL;
if (stream->ES_info)
desc = gst_mpeg_descriptor_find (stream->ES_info, DESC_REGISTRATION);
if (!(desc && DESC_REGISTRATION_format_identifier (desc) == DRF_ID_VC1)) {
GST_WARNING ("0xea private stream type found but no descriptor "
"for VC1. Assuming plain VC1.");
}
template = klass->video_template;
name = g_strdup_printf ("video_%04x", stream->PID);
caps = gst_caps_new_simple ("video/x-wmv",
"wmvversion", G_TYPE_INT, 3,
"format", GST_TYPE_FOURCC, GST_MAKE_FOURCC ('W', 'V', 'C', '1'),
NULL);
break;
}
case ST_BD_AUDIO_AC3:
{
GstMpegTSStream *PMT_stream =
gst_mpegts_demux_get_stream_for_PID (stream->demux, stream->PMT_pid);
GstMPEGDescriptor *program_info = PMT_stream->PMT.program_info;
guint8 *desc = NULL;
if (program_info)
desc = gst_mpeg_descriptor_find (program_info, DESC_REGISTRATION);
if (desc && DESC_REGISTRATION_format_identifier (desc) == DRF_ID_HDMV) {
template = klass->audio_template;
name = g_strdup_printf ("audio_%04x", stream->PID);
caps = gst_caps_new_simple ("audio/x-eac3", NULL);
} else if (gst_mpeg_descriptor_find (stream->ES_info,
DESC_DVB_ENHANCED_AC3)) {
template = klass->audio_template;
name = g_strdup_printf ("audio_%04x", stream->PID);
caps = gst_caps_new_simple ("audio/x-eac3", NULL);
} else {
if (!gst_mpeg_descriptor_find (stream->ES_info, DESC_DVB_AC3)) {
GST_WARNING ("AC3 stream type found but no corresponding "
"descriptor to differentiate between AC3 and EAC3. "
"Assuming plain AC3.");
}
template = klass->audio_template;
name = g_strdup_printf ("audio_%04x", stream->PID);
caps = gst_caps_new_simple ("audio/x-ac3", NULL);
}
break;
}
case ST_BD_AUDIO_EAC3:
template = klass->audio_template;
name = g_strdup_printf ("audio_%04x", stream->PID);
caps = gst_caps_new_simple ("audio/x-eac3", NULL);
break;
case ST_PS_AUDIO_DTS:
template = klass->audio_template;
name = g_strdup_printf ("audio_%04x", stream->PID);
caps = gst_caps_new_simple ("audio/x-dts", NULL);
break;
case ST_PS_AUDIO_LPCM:
template = klass->audio_template;
name = g_strdup_printf ("audio_%04x", stream->PID);
caps = gst_caps_new_simple ("audio/x-lpcm", NULL);
break;
case ST_BD_AUDIO_LPCM:
template = klass->audio_template;
name = g_strdup_printf ("audio_%04x", stream->PID);
caps = gst_caps_new_simple ("audio/x-private-ts-lpcm", NULL);
break;
case ST_PS_DVD_SUBPICTURE:
template = klass->subpicture_template;
name = g_strdup_printf ("subpicture_%04x", stream->PID);
caps = gst_caps_new_simple ("video/x-dvd-subpicture", NULL);
break;
case ST_BD_PGS_SUBPICTURE:
template = klass->subpicture_template;
name = g_strdup_printf ("subpicture_%04x", stream->PID);
caps = gst_caps_new_simple ("subpicture/x-pgs", NULL);
break;
default:
break;
}
if (name == NULL || template == NULL || caps == NULL)
return FALSE;
stream->stream_type = stream_type;
stream->id = id;
GST_DEBUG ("creating new pad %s", name);
stream->pad = gst_pad_new_from_template (template, name);
gst_pad_use_fixed_caps (stream->pad);
gst_pad_set_caps (stream->pad, caps);
gst_caps_unref (caps);
gst_pad_set_query_function (stream->pad,
GST_DEBUG_FUNCPTR (gst_mpegts_demux_src_pad_query));
gst_pad_set_query_type_function (stream->pad,
GST_DEBUG_FUNCPTR (gst_mpegts_demux_src_pad_query_type));
gst_pad_set_event_function (stream->pad,
GST_DEBUG_FUNCPTR (gst_mpegts_demux_src_event));
g_free (name);
return TRUE;
wrong_type:
{
return FALSE;
}
}
static FORCE_INLINE gboolean
mpegts_is_elem_pid (GstMpegTSDemux * demux, guint16 PID)
{
int i;
/* check if it's in our partial ts pid list */
for (i = 0; i < demux->nb_elementary_pids; i++) {
if (demux->elementary_pids[i] == PID) {
return TRUE;
}
}
return FALSE;
}
static gboolean
gst_mpegts_demux_send_new_segment (GstMpegTSDemux * demux,
GstMpegTSStream * stream, gint64 pts)
{
GstMpegTSStream *PCR_stream;
GstMpegTSStream *PMT_stream;
GstClockTime time;
guint64 base_PCR;
/* for the reference start time we need to consult the PCR_PID of the
* current PMT */
if (demux->current_PMT == 0)
goto no_pmt;
PMT_stream = demux->streams[demux->current_PMT];
if (PMT_stream == NULL)
goto no_pmt_stream;
PCR_stream = demux->streams[PMT_stream->PMT.PCR_PID];
if (PCR_stream == NULL)
goto no_pcr_stream;
if (PCR_stream->base_PCR == -1) {
GST_DEBUG_OBJECT (demux, "no base PCR, using last PCR %" G_GUINT64_FORMAT,
PCR_stream->last_PCR);
PCR_stream->base_PCR = PCR_stream->last_PCR;
} else {
GST_DEBUG_OBJECT (demux, "using base PCR %" G_GUINT64_FORMAT,
PCR_stream->base_PCR);
}
if (PCR_stream->last_PCR == -1) {
GST_DEBUG_OBJECT (demux, "no last PCR, using PTS %" G_GUINT64_FORMAT, pts);
PCR_stream->base_PCR = pts;
PCR_stream->last_PCR = pts;
}
base_PCR = PCR_stream->base_PCR;
demux->base_pts = time = MPEGTIME_TO_GSTTIME (base_PCR);
GST_DEBUG_OBJECT (demux, "segment PTS to (%" G_GUINT64_FORMAT ") time: %"
G_GUINT64_FORMAT, base_PCR, time);
if (demux->clock && demux->clock_base == GST_CLOCK_TIME_NONE) {
demux->clock_base = gst_clock_get_time (demux->clock);
gst_clock_set_calibration (demux->clock,
gst_clock_get_internal_time (demux->clock), demux->clock_base, 1, 1);
}
gst_pad_push_event (stream->pad,
gst_event_new_new_segment (FALSE, 1.0, GST_FORMAT_TIME, time, -1, 0));
return TRUE;
/* ERRORS */
no_pmt:
{
/* check if it's in our partial ts pid list */
if (mpegts_is_elem_pid (demux, stream->PID)) {
GST_DEBUG_OBJECT (demux,
"Elementary PID, using pts %" G_GUINT64_FORMAT, pts);
time = MPEGTIME_TO_GSTTIME (pts) + stream->base_time;
GST_DEBUG_OBJECT (demux, "segment PTS to (%" G_GUINT64_FORMAT ") time: %"
G_GUINT64_FORMAT, pts, time);
gst_pad_push_event (stream->pad,
gst_event_new_new_segment (FALSE, 1.0, GST_FORMAT_TIME, time, -1, 0));
return TRUE;
}
}
no_pmt_stream:
{
GST_DEBUG_OBJECT (demux, "no PMT stream found");
return FALSE;
}
no_pcr_stream:
{
GST_DEBUG_OBJECT (demux, "no PCR stream found");
return FALSE;
}
}
static void
gst_mpegts_demux_send_tags_for_stream (GstMpegTSDemux * demux,
GstMpegTSStream * stream)
{
GstTagList *list = NULL;
if (stream->ES_info) {
guint8 *iso639_languages =
gst_mpeg_descriptor_find (stream->ES_info, DESC_ISO_639_LANGUAGE);
if (iso639_languages) {
if (DESC_ISO_639_LANGUAGE_codes_n (iso639_languages)) {
gchar lang_code[4];
gchar *language_n = (gchar *)
DESC_ISO_639_LANGUAGE_language_code_nth (iso639_languages, 0);
lang_code[0] = language_n[0];
lang_code[1] = language_n[1];
lang_code[2] = language_n[2];
lang_code[3] = 0;
if (!list)
list = gst_tag_list_new ();
gst_tag_list_add (list, GST_TAG_MERGE_REPLACE,
GST_TAG_LANGUAGE_CODE, lang_code, NULL);
}
}
}
if (list) {
GST_DEBUG_OBJECT (demux, "Sending tags %p for pad %s:%s",
list, GST_DEBUG_PAD_NAME (stream->pad));
gst_element_found_tags_for_pad (GST_ELEMENT (demux), stream->pad, list);
}
}
static GstFlowReturn
gst_mpegts_demux_combine_flows (GstMpegTSDemux * demux,
GstMpegTSStream * stream, GstFlowReturn ret)
{
gint i;
/* store the value */
stream->last_ret = ret;
/* if it's success we can return the value right away */
if (GST_FLOW_IS_SUCCESS (ret))
goto done;
/* any other error that is not-linked can be returned right
* away */
if (ret != GST_FLOW_NOT_LINKED)
goto done;
/* only return NOT_LINKED if all other pads returned NOT_LINKED */
for (i = 0; i < MPEGTS_MAX_PID + 1; i++) {
if (!(stream = demux->streams[i]))
continue;
/* some other return value (must be SUCCESS but we can return
* other values as well) */
ret = stream->last_ret;
if (ret != GST_FLOW_NOT_LINKED)
goto done;
}
/* if we get here, all other pads were unlinked and we return
* NOT_LINKED then */
done:
return ret;
}
static GstFlowReturn
gst_mpegts_demux_data_cb (GstPESFilter * filter, gboolean first,
GstBuffer * buffer, GstMpegTSStream * stream)
{
GstMpegTSDemux *demux;
GstFlowReturn ret;
GstPad *srcpad;
gint64 pts;
GstClockTime time;
demux = stream->demux;
srcpad = stream->pad;
GST_DEBUG_OBJECT (demux, "got data on PID 0x%04x", stream->PID);
if (first && filter->pts != -1) {
pts = filter->pts;
time = MPEGTIME_TO_GSTTIME (pts) + stream->base_time;
if ((stream->last_time > 0 && stream->last_time < time &&
time - stream->last_time > GST_SECOND * 60 * 10)
|| (stream->last_time > time
&& stream->last_time - time > GST_SECOND * 60 * 10)) {
/* check first to see if we're in middle of detecting a discont in PCR.
* if we are we're not sure what timestamp the buffer should have, best
* to drop. */
if (stream->PMT_pid <= MPEGTS_MAX_PID && demux->streams[stream->PMT_pid]
&& demux->streams[demux->streams[stream->PMT_pid]->PMT.PCR_PID]
&& demux->streams[demux->streams[stream->PMT_pid]->PMT.PCR_PID]->
discont_PCR) {
GST_WARNING_OBJECT (demux, "middle of discont, dropping");
goto bad_timestamp;
}
/* check for wraparounds */
else if (stream->last_time > 0 && time < stream->last_time &&
stream->last_time - time > MPEGTIME_TO_GSTTIME (G_MAXUINT32)) {
/* wrap around occurred */
if (stream->base_time + MPEGTIME_TO_GSTTIME ((guint64) (1) << 33) +
MPEGTIME_TO_GSTTIME (pts) >
stream->last_time + GST_SECOND * 60 * 10) {
GST_DEBUG_OBJECT (demux,
"looks like we have a corrupt packet because its pts is a lot lower than"
" the previous pts but not a wraparound");
goto bad_timestamp;
}
/* wraparound has occured but before we have detected in the pcr,
* so check we're actually getting pcr's...if we are, don't update
* the base time..just set the time and last_time correctly
*/
if (stream->PMT_pid <= MPEGTS_MAX_PID && demux->streams[stream->PMT_pid]
&& demux->streams[demux->streams[stream->PMT_pid]->PMT.PCR_PID]
&& demux->streams[demux->streams[stream->PMT_pid]->PMT.PCR_PID]->
last_PCR > 0) {
GST_DEBUG_OBJECT (demux, "timestamps wrapped before noticed in PCR");
time = MPEGTIME_TO_GSTTIME (pts) + stream->base_time +
MPEGTIME_TO_GSTTIME ((guint64) (1) << 33);
stream->last_time = time;
} else {
stream->base_time = stream->base_time +
MPEGTIME_TO_GSTTIME ((guint64) (1) << 33);
time = MPEGTIME_TO_GSTTIME (pts) + stream->base_time;
GST_DEBUG_OBJECT (demux,
"timestamps wrapped around, compensating with new base time: %"
GST_TIME_FORMAT "last time: %" GST_TIME_FORMAT " time: %"
GST_TIME_FORMAT, GST_TIME_ARGS (stream->base_time),
GST_TIME_ARGS (stream->last_time), GST_TIME_ARGS (time));
stream->last_time = time;
}
} else if (stream->last_time > 0 && time > stream->last_time &&
time - stream->last_time > MPEGTIME_TO_GSTTIME (G_MAXUINT32) &&
stream->base_time > 0) {
/* had a previous wrap around */
if (time - MPEGTIME_TO_GSTTIME ((guint64) (1) << 33) +
GST_SECOND * 60 * 10 < stream->last_time) {
GST_DEBUG_OBJECT (demux,
"looks like we have a corrupt packet because its pts is a lot higher than"
" the previous pts but not because of a wraparound or pcr discont");
goto bad_timestamp;
}
if (ABS ((time - MPEGTIME_TO_GSTTIME ((guint64) (1) << 33)) -
stream->last_time) < GST_SECOND) {
GST_DEBUG_OBJECT (demux,
"timestamps wrapped around earlier but we have an out of pts: %"
G_GUINT64_FORMAT ", as %" GST_TIME_FORMAT " translated to: %"
GST_TIME_FORMAT " and last_time of %" GST_TIME_FORMAT, pts,
GST_TIME_ARGS (time),
GST_TIME_ARGS (time - MPEGTIME_TO_GSTTIME ((guint64) (1) << 33)),
GST_TIME_ARGS (stream->last_time));
time = time - MPEGTIME_TO_GSTTIME ((guint64) (1) << 33);
} else {
GST_DEBUG_OBJECT (demux,
"timestamp may have wrapped around recently but not sure and pts"
" is very different, dropping it timestamp of this packet: %"
GST_TIME_FORMAT " compared to last timestamp: %" GST_TIME_FORMAT,
GST_TIME_ARGS (time -
MPEGTIME_TO_GSTTIME ((guint64) (1) << (33))),
GST_TIME_ARGS (stream->last_time));
goto bad_timestamp;
}
} else {
/* we must have a corrupt packet */
GST_WARNING_OBJECT (demux, "looks like we have a corrupt packet because"
" its timestamp is buggered timestamp: %" GST_TIME_FORMAT
" compared to" " last timestamp: %" GST_TIME_FORMAT,
GST_TIME_ARGS (time), GST_TIME_ARGS (stream->last_time));
goto bad_timestamp;
}
} else { /* do not set last_time if a packet with pts from before wrap
around arrived after the wrap around occured */
stream->last_time = time;
}
} else {
time = GST_CLOCK_TIME_NONE;
pts = -1;
}
GST_DEBUG_OBJECT (demux, "setting PTS to (%" G_GUINT64_FORMAT ") time: %"
GST_TIME_FORMAT " on buffer %p first buffer: %d base_time: %"
GST_TIME_FORMAT, pts, GST_TIME_ARGS (time), buffer, first,
GST_TIME_ARGS (stream->base_time));
GST_BUFFER_TIMESTAMP (buffer) = time;
/* check if we have a pad already */
if (srcpad == NULL) {
/* fill in the last bits of the stream */
/* if no stream type, then assume it based on the PES start code,
* needed for partial ts streams without PMT */
if (G_UNLIKELY (stream->flags & MPEGTS_STREAM_FLAG_STREAM_TYPE_UNKNOWN)) {
if ((filter->start_code & 0xFFFFFFF0) == PACKET_VIDEO_START_CODE) {
/* it is mpeg2 video */
stream->stream_type = ST_VIDEO_MPEG2;
stream->flags &= ~MPEGTS_STREAM_FLAG_STREAM_TYPE_UNKNOWN;
stream->flags |= MPEGTS_STREAM_FLAG_IS_VIDEO;
GST_DEBUG_OBJECT (demux, "Found stream 0x%04x without PMT with video "
"start_code. Treating as video", stream->PID);
} else if ((filter->start_code & 0xFFFFFFE0) == PACKET_AUDIO_START_CODE) {
/* it is mpeg audio */
stream->stream_type = ST_AUDIO_MPEG2;
stream->flags &= ~MPEGTS_STREAM_FLAG_STREAM_TYPE_UNKNOWN;
GST_DEBUG_OBJECT (demux, "Found stream 0x%04x without PMT with audio "
"start_code. Treating as audio", stream->PID);
} else {
GST_LOG_OBJECT (demux, "Stream start code on pid 0x%04x is: 0x%x",
stream->PID, filter->start_code);
}
}
if (!gst_mpegts_demux_fill_stream (stream, filter->id, stream->stream_type))
goto unknown_type;
GST_DEBUG_OBJECT (demux,
"New stream 0x%04x of type 0x%02x with caps %" GST_PTR_FORMAT,
stream->PID, stream->stream_type, GST_PAD_CAPS (stream->pad));
srcpad = stream->pad;
/* activate and add */
gst_pad_set_active (srcpad, TRUE);
gst_element_add_pad (GST_ELEMENT_CAST (demux), srcpad);
demux->need_no_more_pads = TRUE;
/* send new_segment */
gst_mpegts_demux_send_new_segment (demux, stream, pts);
/* send tags */
gst_mpegts_demux_send_tags_for_stream (demux, stream);
}
GST_DEBUG_OBJECT (srcpad, "pushing buffer");
gst_buffer_set_caps (buffer, GST_PAD_CAPS (srcpad));
ret = gst_pad_push (srcpad, buffer);
ret = gst_mpegts_demux_combine_flows (demux, stream, ret);
return ret;
/* ERROR */
unknown_type:
{
GST_DEBUG_OBJECT (demux, "got unknown stream id 0x%02x, type 0x%02x",
filter->id, stream->stream_type);
gst_buffer_unref (buffer);
return gst_mpegts_demux_combine_flows (demux, stream, GST_FLOW_NOT_LINKED);
}
bad_timestamp:
{
gst_buffer_unref (buffer);
return gst_mpegts_demux_combine_flows (demux, stream, GST_FLOW_OK);
}
}
static void
gst_mpegts_demux_resync_cb (GstPESFilter * filter, GstMpegTSStream * stream)
{
/* does nothing for now */
}
/*
* CA_section() {
* table_id 8 uimsbf == 0x01
* section_syntax_indicator 1 bslbf == 1
* '0' 1 bslbf == 0
* reserved 2 bslbf
* section_length 12 uimsbf == 00xxxxx...
* reserved 18 bslbf
* version_number 5 uimsbf
* current_next_indicator 1 bslbf
* section_number 8 uimsbf
* last_section_number 8 uimsbf
* for (i=0; i<N;i++) {
* descriptor()
* }
* CRC_32 32 rpchof
* }
*/
static FORCE_INLINE gboolean
gst_mpegts_stream_parse_cat (GstMpegTSStream * stream,
guint8 * data, guint datalen)
{
GstMpegTSDemux *demux;
demux = stream->demux;
GST_DEBUG_OBJECT (demux, "parsing CA section");
return TRUE;
}
static void
gst_mpegts_activate_pmt (GstMpegTSDemux * demux, GstMpegTSStream * stream)
{
GST_DEBUG_OBJECT (demux, "activating PMT 0x%08x", stream->PID);
/* gst_mpegts_demux_remove_pads (demux); */
demux->current_PMT = stream->PID;
/* PMT has been updated, signal the change */
if (demux->current_PMT == stream->PID)
g_object_notify ((GObject *) (demux), "pmt-info");
}
/*
* TS_program_map_section() {
* table_id 8 uimsbf == 0x02
* section_syntax_indicator 1 bslbf == 1
* '0' 1 bslbf == 0
* reserved 2 bslbf
* section_length 12 uimsbf == 00xxxxx...
* program_number 16 uimsbf
* reserved 2 bslbf
* version_number 5 uimsbf
* current_next_indicator 1 bslbf
* section_number 8 uimsbf
* last_section_number 8 uimsbf
* reserved 3 bslbf
* PCR_PID 13 uimsbf
* reserved 4 bslbf
* program_info_length 12 uimsbf == 00xxxxx...
* for (i=0; i<N; i++) {
* descriptor()
* }
* for (i=0;i<N1;i++) {
* stream_type 8 uimsbf
* reserved 3 bslbf
* elementary_PID 13 uimsnf
* reserved 4 bslbf
* ES_info_length 12 uimsbf == 00xxxxx...
* for (i=0; i<N2; i++) {
* descriptor()
* }
* }
* CRC_32 32 rpchof
* }
*/
static FORCE_INLINE gboolean
gst_mpegts_stream_parse_pmt (GstMpegTSStream * stream,
guint8 * data, guint datalen)
{
GstMpegTSDemux *demux;
gint entries;
guint32 CRC;
GstMpegTSPMT *PMT;
guint version_number;
guint8 current_next_indicator;
guint16 program_number;
demux = stream->demux;
if (G_UNLIKELY (*data++ != 0x02))
goto wrong_id;
if ((data[0] & 0xc0) != 0x80)
goto wrong_sync;
if ((data[0] & 0x0c) != 0x00)
goto wrong_seclen;
data += 2;
if (demux->check_crc)
if (G_UNLIKELY (gst_mpegts_demux_calc_crc32 (data - 3, datalen) != 0))
goto wrong_crc;
GST_LOG_OBJECT (demux, "PMT section_length: %d", datalen - 3);
PMT = &stream->PMT;
/* check if version number changed */
version_number = (data[2] & 0x3e) >> 1;
GST_LOG_OBJECT (demux, "PMT version_number: %d", version_number);
current_next_indicator = (data[2] & 0x01);
GST_LOG_OBJECT (demux, "PMT current_next_indicator %d",
current_next_indicator);
if (current_next_indicator == 0)
goto not_yet_applicable;
program_number = GST_READ_UINT16_BE (data);
if (demux->program_number != -1 && demux->program_number != program_number) {
goto wrong_program_number;
}
if (demux->program_number == -1) {
GST_INFO_OBJECT (demux, "No program number set, so using first parsed PMT"
"'s program number: %d", program_number);
demux->program_number = program_number;
}
if (version_number == PMT->version_number)
goto same_version;
PMT->version_number = version_number;
PMT->current_next_indicator = current_next_indicator;
stream->PMT.program_number = program_number;
data += 3;
GST_DEBUG_OBJECT (demux, "PMT program_number: %d", PMT->program_number);
PMT->section_number = *data++;
GST_DEBUG_OBJECT (demux, "PMT section_number: %d", PMT->section_number);
PMT->last_section_number = *data++;
GST_DEBUG_OBJECT (demux, "PMT last_section_number: %d",
PMT->last_section_number);
PMT->PCR_PID = GST_READ_UINT16_BE (data);
PMT->PCR_PID &= 0x1fff;
data += 2;
GST_DEBUG_OBJECT (demux, "PMT PCR_PID: 0x%04x", PMT->PCR_PID);
/* create or get stream, not much we can say about it except that when we get
* a data stream and we need a PCR, we can use the stream to get/store the
* base_PCR. */
gst_mpegts_demux_get_stream_for_PID (demux, PMT->PCR_PID);
if ((data[0] & 0x0c) != 0x00)
goto wrong_pilen;
PMT->program_info_length = GST_READ_UINT16_BE (data);
PMT->program_info_length &= 0x0fff;
/* FIXME: validate value of program_info_length */
data += 2;
/* FIXME: validate value of program_info_length, before using */
/* parse descriptor */
if (G_UNLIKELY (PMT->program_info))
gst_mpeg_descriptor_free (PMT->program_info);
PMT->program_info =
gst_mpeg_descriptor_parse (data, PMT->program_info_length);
/* skip descriptor */
data += PMT->program_info_length;
GST_DEBUG_OBJECT (demux, "PMT program_info_length: %d",
PMT->program_info_length);
entries = datalen - 3 - PMT->program_info_length - 9 - 4;
if (G_UNLIKELY (PMT->entries))
g_array_free (PMT->entries, TRUE);
PMT->entries = g_array_new (FALSE, TRUE, sizeof (GstMpegTSPMTEntry));
while (entries > 0) {
GstMpegTSPMTEntry entry;
GstMpegTSStream *ES_stream;
guint8 stream_type;
guint16 ES_info_length;
stream_type = *data++;
entry.PID = GST_READ_UINT16_BE (data);
entry.PID &= 0x1fff;
data += 2;
if ((data[0] & 0x0c) != 0x00)
goto wrong_esilen;
ES_info_length = GST_READ_UINT16_BE (data);
ES_info_length &= 0x0fff;
data += 2;
/* get/create elementary stream */
ES_stream = gst_mpegts_demux_get_stream_for_PID (demux, entry.PID);
/* check if PID unknown */
if (ES_stream->PID_type == PID_TYPE_UNKNOWN) {
/* set as elementary */
ES_stream->PID_type = PID_TYPE_ELEMENTARY;
/* set stream type */
/* hack for ITV HD (sid 10510, video pid 3401 */
if (program_number == 10510 && entry.PID == 3401 &&
stream_type == ST_PRIVATE_DATA)
stream_type = ST_VIDEO_H264;
ES_stream->stream_type = stream_type;
ES_stream->flags &= ~MPEGTS_STREAM_FLAG_STREAM_TYPE_UNKNOWN;
/* init base and last time */
ES_stream->base_time = 0;
ES_stream->last_time = 0;
/* parse descriptor */
ES_stream->ES_info = gst_mpeg_descriptor_parse (data, ES_info_length);
if (stream_type == ST_PRIVATE_SECTIONS) {
/* not really an ES, so use section filter not pes filter */
/* initialise section filter */
GstCaps *caps;
gst_section_filter_init (&ES_stream->section_filter);
ES_stream->PID_type = PID_TYPE_PRIVATE_SECTION;
ES_stream->pad = gst_pad_new_from_static_template (&private_template,
g_strdup_printf ("private_%04x", entry.PID));
gst_pad_set_active (ES_stream->pad, TRUE);
caps = gst_caps_new_simple ("application/x-mpegts-private-section",
NULL);
gst_pad_use_fixed_caps (ES_stream->pad);
gst_pad_set_caps (ES_stream->pad, caps);
gst_caps_unref (caps);
gst_element_add_pad (GST_ELEMENT_CAST (demux), ES_stream->pad);
} else {
/* Recognise video streams based on stream_type */
if (gst_mpegts_stream_is_video (ES_stream))
ES_stream->flags |= MPEGTS_STREAM_FLAG_IS_VIDEO;
/* set adaptor */
gst_pes_filter_init (&ES_stream->filter, NULL, NULL);
gst_pes_filter_set_callbacks (&ES_stream->filter,
(GstPESFilterData) gst_mpegts_demux_data_cb,
(GstPESFilterResync) gst_mpegts_demux_resync_cb, ES_stream);
if (ES_stream->flags & MPEGTS_STREAM_FLAG_IS_VIDEO)
ES_stream->filter.allow_unbounded = TRUE;
ES_stream->PMT_pid = stream->PID;
}
}
/* skip descriptor */
data += ES_info_length;
GST_DEBUG_OBJECT (demux,
" PMT stream_type: %02x, PID: 0x%04x (ES_info_len %d)", stream_type,
entry.PID, ES_info_length);
g_array_append_val (PMT->entries, entry);
entries -= 5 + ES_info_length;
}
CRC = GST_READ_UINT32_BE (data);
GST_DEBUG_OBJECT (demux, "PMT CRC: 0x%08x", CRC);
if (demux->program_number == -1) {
/* No program specified, take the first PMT */
if (demux->current_PMT == 0 || demux->current_PMT == stream->PID)
gst_mpegts_activate_pmt (demux, stream);
} else {
/* Program specified, activate this if it matches */
if (demux->program_number == PMT->program_number)
gst_mpegts_activate_pmt (demux, stream);
}
return TRUE;
/* ERRORS */
wrong_crc:
{
GST_DEBUG_OBJECT (demux, "wrong crc");
return FALSE;
}
same_version:
{
GST_DEBUG_OBJECT (demux, "same version as existing PMT");
return TRUE;
}
wrong_program_number:
{
GST_DEBUG_OBJECT (demux, "PMT is for program number we don't care about");
return TRUE;
}
not_yet_applicable:
{
GST_DEBUG_OBJECT (demux, "Ignoring PMT with current_next_indicator = 0");
return TRUE;
}
wrong_id:
{
GST_DEBUG_OBJECT (demux, "expected table_id == 0, got 0x%02x", data[0]);
return FALSE;
}
wrong_sync:
{
GST_DEBUG_OBJECT (demux, "expected sync 10, got %02x", data[0]);
return FALSE;
}
wrong_seclen:
{
GST_DEBUG_OBJECT (demux,
"first two bits of section length must be 0, got %02x", data[0]);
return FALSE;
}
wrong_pilen:
{
GST_DEBUG_OBJECT (demux,
"first two bits of program_info length must be 0, got %02x", data[0]);
return FALSE;
}
wrong_esilen:
{
GST_DEBUG_OBJECT (demux,
"first two bits of ES_info length must be 0, got %02x", data[0]);
g_array_free (stream->PMT.entries, TRUE);
stream->PMT.entries = NULL;
gst_mpeg_descriptor_free (stream->PMT.program_info);
stream->PMT.program_info = NULL;
return FALSE;
}
}
/*
* private_section() {
* table_id 8 uimsbf
* section_syntax_indicator 1 bslbf
* private_indicator 1 bslbf
* reserved 2 bslbf
* private_section_length 12 uimsbf
* if (section_syntax_indicator == '0') {
* for ( i=0;i<N;i++) {
* private_data_byte 8 bslbf
* }
* }
* else {
* table_id_extension 16 uimsbf
* reserved 2 bslbf
* version_number 5 uimsbf
* current_next_indicator 1 bslbf
* section_number 8 uimsbf
* last_section_number 8 uimsbf
* for ( i=0;i<private_section_length-9;i++) {
* private_data_byte 8 bslbf
* }
* CRC_32 32 rpchof
* }
* }
*/
static FORCE_INLINE gboolean
gst_mpegts_stream_parse_private_section (GstMpegTSStream * stream,
guint8 * data, guint datalen)
{
GstMpegTSDemux *demux;
GstBuffer *buffer;
demux = stream->demux;
if (demux->check_crc)
if (gst_mpegts_demux_calc_crc32 (data, datalen) != 0)
goto wrong_crc;
/* just dump this down the pad */
if (gst_pad_alloc_buffer (stream->pad, 0, datalen, NULL, &buffer) ==
GST_FLOW_OK) {
oil_memcpy (buffer->data, data, datalen);
gst_pad_push (stream->pad, buffer);
}
GST_DEBUG_OBJECT (demux, "parsing private section");
return TRUE;
wrong_crc:
{
GST_DEBUG_OBJECT (demux, "wrong crc");
return FALSE;
}
}
/*
* adaptation_field() {
* adaptation_field_length 8 uimsbf
* if(adaptation_field_length >0) {
* discontinuity_indicator 1 bslbf
* random_access_indicator 1 bslbf
* elementary_stream_priority_indicator 1 bslbf
* PCR_flag 1 bslbf
* OPCR_flag 1 bslbf
* splicing_point_flag 1 bslbf
* transport_private_data_flag 1 bslbf
* adaptation_field_extension_flag 1 bslbf
* if(PCR_flag == '1') {
* program_clock_reference_base 33 uimsbf
* reserved 6 bslbf
* program_clock_reference_extension 9 uimsbf
* }
* if(OPCR_flag == '1') {
* original_program_clock_reference_base 33 uimsbf
* reserved 6 bslbf
* original_program_clock_reference_extension 9 uimsbf
* }
* if (splicing_point_flag == '1') {
* splice_countdown 8 tcimsbf
* }
* if(transport_private_data_flag == '1') {
* transport_private_data_length 8 uimsbf
* for (i=0; i<transport_private_data_length;i++){
* private_data_byte 8 bslbf
* }
* }
* if (adaptation_field_extension_flag == '1' ) {
* adaptation_field_extension_length 8 uimsbf
* ltw_flag 1 bslbf
* piecewise_rate_flag 1 bslbf
* seamless_splice_flag 1 bslbf
* reserved 5 bslbf
* if (ltw_flag == '1') {
* ltw_valid_flag 1 bslbf
* ltw_offset 15 uimsbf
* }
* if (piecewise_rate_flag == '1') {
* reserved 2 bslbf
* piecewise_rate 22 uimsbf
* }
* if (seamless_splice_flag == '1'){
* splice_type 4 bslbf
* DTS_next_AU[32..30] 3 bslbf
* marker_bit 1 bslbf
* DTS_next_AU[29..15] 15 bslbf
* marker_bit 1 bslbf
* DTS_next_AU[14..0] 15 bslbf
* marker_bit 1 bslbf
* }
* for ( i=0;i<N;i++) {
* reserved 8 bslbf
* }
* }
* for (i=0;i<N;i++){
* stuffing_byte 8 bslbf
* }
* }
* }
*/
static FORCE_INLINE gboolean
gst_mpegts_demux_parse_adaptation_field (GstMpegTSStream * stream,
const guint8 * data, guint data_len, guint * consumed)
{
GstMpegTSDemux *demux;
guint8 length;
guint8 *data_end;
gint i;
GstMpegTSStream *pmt_stream;
demux = stream->demux;
data_end = ((guint8 *) data) + data_len;
length = *data++;
if (G_UNLIKELY (length > data_len))
goto wrong_length;
GST_DEBUG_OBJECT (demux, "parsing adaptation field, length %d", length);
if (length > 0) {
guint8 flags = *data++;
GST_LOG_OBJECT (demux, "flags 0x%02x", flags);
/* discontinuity flag */
if (flags & 0x80) {
GST_DEBUG_OBJECT (demux, "discontinuity flag set");
}
/* PCR_flag */
if (flags & 0x10) {
guint32 pcr1;
guint16 pcr2;
guint64 pcr, pcr_ext;
gboolean valid_pcr = TRUE;
pcr1 = GST_READ_UINT32_BE (data);
pcr2 = GST_READ_UINT16_BE (data + 4);
pcr = ((guint64) pcr1) << 1;
pcr |= (pcr2 & 0x8000) >> 15;
pcr_ext = (pcr2 & 0x01ff);
if (pcr_ext)
pcr = (pcr * 300 + pcr_ext % 300) / 300;
GST_DEBUG_OBJECT (demux,
"have PCR %" G_GUINT64_FORMAT "(%" GST_TIME_FORMAT ") on PID 0x%04x "
"and last pcr is %" G_GUINT64_FORMAT " (%" GST_TIME_FORMAT ")", pcr,
GST_TIME_ARGS (MPEGTIME_TO_GSTTIME (pcr)), stream->PID,
stream->last_PCR,
GST_TIME_ARGS (MPEGTIME_TO_GSTTIME (stream->last_PCR)));
/* pcr has been converted into units of 90Khz ticks
* so assume discont if last pcr was > 900000 (10 second) lower */
if (stream->last_PCR != -1 &&
(pcr - stream->last_PCR > 900000 || pcr < stream->last_PCR)) {
GstClockTimeDiff base_time_difference;
GST_DEBUG_OBJECT (demux,
"looks like we have a discont, this pcr should really be approx: %"
G_GUINT64_FORMAT, stream->last_PCR + stream->last_PCR_difference);
if (stream->discont_PCR == FALSE) {
if (pcr > stream->last_PCR) {
base_time_difference = -MPEGTIME_TO_GSTTIME ((pcr -
(stream->last_PCR + stream->last_PCR_difference)));
} else {
base_time_difference = MPEGTIME_TO_GSTTIME ((stream->last_PCR +
stream->last_PCR_difference) - pcr);
}
stream->discont_PCR = TRUE;
stream->discont_difference = base_time_difference;
valid_pcr = FALSE;
} else {
GstClockTimeDiff base_time_difference;
/* need to update all pmt streams in case this pcr is pcr
* for multiple programs */
int j;
gboolean *pmts_checked = (gboolean *) & demux->pmts_checked;
memset (pmts_checked, 0, sizeof (gboolean) * (MPEGTS_MAX_PID + 1));
for (j = 0; j < MPEGTS_MAX_PID + 1; j++) {
if (demux->streams[j]
&& demux->streams[j]->PMT_pid <= MPEGTS_MAX_PID) {
if (!pmts_checked[demux->streams[j]->PMT_pid]) {
/* check if this is correct pcr for pmt */
if (demux->streams[demux->streams[j]->PMT_pid] &&
stream->PID ==
demux->streams[demux->streams[j]->PMT_pid]->PMT.PCR_PID) {
/* checking the pcr discont is similar this second time
* if similar, update the es pids
* if not, assume it's a false discont due to corruption
* or other */
if (pcr > stream->last_PCR) {
base_time_difference = -MPEGTIME_TO_GSTTIME ((pcr -
(stream->last_PCR + stream->last_PCR_difference)));
} else {
base_time_difference =
MPEGTIME_TO_GSTTIME ((stream->last_PCR +
stream->last_PCR_difference) - pcr);
}
if ((base_time_difference - stream->discont_difference > 0 &&
base_time_difference - stream->discont_difference <
GST_SECOND * 10) ||
(stream->discont_difference - base_time_difference > 0 &&
stream->discont_difference - base_time_difference <
GST_SECOND * 10)) {
pmt_stream = demux->streams[demux->streams[j]->PMT_pid];
GST_DEBUG_OBJECT (demux, "Updating base_time on all es "
"pids belonging to PMT 0x%02x", stream->PMT_pid);
for (i = 0; i <= pmt_stream->PMT.entries->len; i++) {
GstMpegTSPMTEntry *cur_entry =
&g_array_index (pmt_stream->PMT.entries,
GstMpegTSPMTEntry, i);
GST_DEBUG_OBJECT (demux,
"Updating base time on " "pid 0x%02x by %"
G_GINT64_FORMAT, cur_entry->PID,
stream->discont_difference);
if (cur_entry->PID <= MPEGTS_MAX_PID
&& demux->streams[cur_entry->PID]) {
demux->streams[cur_entry->PID]->base_time +=
stream->discont_difference;
}
}
} else {
GST_DEBUG_OBJECT (demux, "last PCR discont looked to be "
"bogus: previous discont difference %" G_GINT64_FORMAT
" now %" G_GINT64_FORMAT, stream->discont_difference,
base_time_difference);
valid_pcr = FALSE;
}
}
}
pmts_checked[demux->streams[j]->PMT_pid] = TRUE;
}
}
stream->discont_PCR = FALSE;
stream->discont_difference = 0;
}
} else if (stream->last_PCR != -1) {
if (stream->discont_PCR) {
GST_DEBUG_OBJECT (demux, "last PCR discont looked to be bogus");
stream->discont_PCR = FALSE;
stream->discont_difference = 0;
}
stream->last_PCR_difference = pcr - stream->last_PCR;
}
GST_DEBUG_OBJECT (demux,
"valid pcr: %d last PCR difference: %" G_GUINT64_FORMAT, valid_pcr,
stream->last_PCR_difference);
if (valid_pcr) {
GstMpegTSStream *PMT_stream = demux->streams[demux->current_PMT];
if (PMT_stream && PMT_stream->PMT.PCR_PID == stream->PID) {
if (demux->pcr[0] == -1) {
GST_DEBUG ("RECORDING pcr[0]:%" G_GUINT64_FORMAT, pcr);
demux->pcr[0] = pcr;
demux->num_packets = 0;
} /* Considering a difference of 1 sec ie 90000 ticks */
else if (G_UNLIKELY (demux->pcr[1] == -1
&& ((pcr - demux->pcr[0]) >= 90000))) {
GST_DEBUG ("RECORDING pcr[1]:%" G_GUINT64_FORMAT, pcr);
demux->pcr[1] = pcr;
}
}
stream->last_PCR = pcr;
if (demux->clock && demux->clock_base != GST_CLOCK_TIME_NONE) {
gdouble r_squared;
GstMpegTSStream *PMT_stream;
/* for the reference start time we need to consult the PCR_PID of the
* current PMT */
PMT_stream = demux->streams[demux->current_PMT];
if (PMT_stream->PMT.PCR_PID == stream->PID) {
GST_LOG_OBJECT (demux,
"internal %" GST_TIME_FORMAT " observation %" GST_TIME_FORMAT
" pcr: %" G_GUINT64_FORMAT " base_pcr: %" G_GUINT64_FORMAT
"pid: %d",
GST_TIME_ARGS (gst_clock_get_internal_time (demux->clock)),
GST_TIME_ARGS (MPEGTIME_TO_GSTTIME (pcr) -
MPEGTIME_TO_GSTTIME (stream->base_PCR) + stream->base_time +
demux->clock_base), pcr, stream->base_PCR, stream->PID);
gst_clock_add_observation (demux->clock,
gst_clock_get_internal_time (demux->clock),
demux->clock_base + stream->base_time +
MPEGTIME_TO_GSTTIME (pcr) -
MPEGTIME_TO_GSTTIME (stream->base_PCR), &r_squared);
}
}
}
data += 6;
}
/* OPCR_flag */
if (flags & 0x08) {
guint32 opcr1;
guint16 opcr2;
guint64 opcr, opcr_ext;
opcr1 = GST_READ_UINT32_BE (data);
opcr2 = GST_READ_UINT16_BE (data + 4);
opcr = ((guint64) opcr1) << 1;
opcr |= (opcr2 & 0x8000) >> 15;
opcr_ext = (opcr2 & 0x01ff);
if (opcr_ext)
opcr = (opcr * 300 + opcr_ext % 300) / 300;
GST_DEBUG_OBJECT (demux, "have OPCR %" G_GUINT64_FORMAT " on PID 0x%04x",
opcr, stream->PID);
stream->last_OPCR = opcr;
data += 6;
}
/* splicing_point_flag */
if (flags & 0x04) {
guint8 splice_countdown;
splice_countdown = *data++;
GST_DEBUG_OBJECT (demux, "have splicing point, countdown %d",
splice_countdown);
}
/* transport_private_data_flag */
if (flags & 0x02) {
guint8 plength = *data++;
if (data + plength > data_end)
goto private_data_too_large;
GST_DEBUG_OBJECT (demux, "have private data, length: %d", plength);
data += plength;
}
/* adaptation_field_extension_flag */
if (flags & 0x01) {
GST_DEBUG_OBJECT (demux, "have field extension");
}
}
*consumed = length + 1;
return TRUE;
/* ERRORS */
wrong_length:
{
GST_DEBUG_OBJECT (demux, "length %d > %d", length, data_len);
return FALSE;
}
private_data_too_large:
{
GST_DEBUG_OBJECT (demux, "have too large a private data length");
return FALSE;
}
}
/*
* program_association_section() {
* table_id 8 uimsbf == 0x00
* section_syntax_indicator 1 bslbf == 1
* '0' 1 bslbf == 0
* reserved 2 bslbf
* section_length 12 uimsbf == 00xxxxx...
* transport_stream_id 16 uimsbf
* reserved 2 bslbf
* version_number 5 uimsbf
* current_next_indicator 1 bslbf
* section_number 8 uimsbf
* last_section_number 8 uimsbf
* for (i=0; i<N;i++) {
* program_number 16 uimsbf
* reserved 3 bslbf
* if(program_number == '0') {
* network_PID 13 uimsbf
* }
* else {
* program_map_PID 13 uimsbf
* }
* }
* CRC_32 32 rpchof
* }
*/
static FORCE_INLINE gboolean
gst_mpegts_stream_parse_pat (GstMpegTSStream * stream,
guint8 * data, guint datalen)
{
GstMpegTSDemux *demux;
gint entries;
guint32 CRC;
guint version_number;
guint8 current_next_indicator;
GstMpegTSPAT *PAT;
demux = stream->demux;
if (datalen < 8)
return FALSE;
if (*data++ != 0x00)
goto wrong_id;
if ((data[0] & 0xc0) != 0x80)
goto wrong_sync;
if (G_UNLIKELY ((data[0] & 0x0c) != 0x00))
goto wrong_seclen;
data += 2;
GST_DEBUG_OBJECT (demux, "PAT section_length: %d", datalen - 3);
if (demux->check_crc)
if (gst_mpegts_demux_calc_crc32 (data - 3, datalen) != 0)
goto wrong_crc;
PAT = &stream->PAT;
version_number = (data[2] & 0x3e) >> 1;
GST_DEBUG_OBJECT (demux, "PAT version_number: %d", version_number);
if (G_UNLIKELY (version_number == PAT->version_number))
goto same_version;
current_next_indicator = (data[2] & 0x01);
GST_DEBUG_OBJECT (demux, "PAT current_next_indicator %d",
current_next_indicator);
if (current_next_indicator == 0)
goto not_yet_applicable;
PAT->version_number = version_number;
PAT->current_next_indicator = current_next_indicator;
PAT->transport_stream_id = GST_READ_UINT16_BE (data);
data += 3;
GST_DEBUG_OBJECT (demux, "PAT stream_id: %d", PAT->transport_stream_id);
PAT->section_number = *data++;
PAT->last_section_number = *data++;
GST_DEBUG_OBJECT (demux, "PAT current_next_indicator: %d",
PAT->current_next_indicator);
GST_DEBUG_OBJECT (demux, "PAT section_number: %d", PAT->section_number);
GST_DEBUG_OBJECT (demux, "PAT last_section_number: %d",
PAT->last_section_number);
/* 5 bytes after section length and a 4 bytes CRC,
* the rest is 4 byte entries */
entries = (datalen - 3 - 9) / 4;
if (PAT->entries)
g_array_free (PAT->entries, TRUE);
PAT->entries =
g_array_sized_new (FALSE, TRUE, sizeof (GstMpegTSPATEntry), entries);
while (entries--) {
GstMpegTSPATEntry entry;
GstMpegTSStream *PMT_stream;
entry.program_number = GST_READ_UINT16_BE (data);
data += 2;
entry.PID = GST_READ_UINT16_BE (data);
entry.PID &= 0x1fff;
data += 2;
/* get/create stream for PMT */
PMT_stream = gst_mpegts_demux_get_stream_for_PID (demux, entry.PID);
if (PMT_stream->PID_type != PID_TYPE_PROGRAM_MAP) {
/* set as program map */
PMT_stream->PID_type = PID_TYPE_PROGRAM_MAP;
/* initialise section filter */
gst_section_filter_init (&PMT_stream->section_filter);
}
g_array_append_val (PAT->entries, entry);
GST_DEBUG_OBJECT (demux, " PAT program: %d, PID 0x%04x",
entry.program_number, entry.PID);
}
CRC = GST_READ_UINT32_BE (data);
GST_DEBUG_OBJECT (demux, "PAT CRC: 0x%08x", CRC);
/* PAT has been updated, signal the change */
g_object_notify ((GObject *) (demux), "pat-info");
return TRUE;
/* ERRORS */
wrong_crc:
{
GST_DEBUG_OBJECT (demux, "wrong crc");
return FALSE;
}
same_version:
{
GST_DEBUG_OBJECT (demux, "same version as existing PAT");
return TRUE;
}
not_yet_applicable:
{
GST_DEBUG_OBJECT (demux, "Ignoring PAT with current_next_indicator = 0");
return TRUE;
}
wrong_id:
{
GST_DEBUG_OBJECT (demux, "expected table_id == 0, got %02x", data[0]);
return FALSE;
}
wrong_sync:
{
GST_DEBUG_OBJECT (demux, "expected sync 10, got %02x", data[0]);
return FALSE;
}
wrong_seclen:
{
GST_DEBUG_OBJECT (demux,
"first two bits of section length must be 0, got %02x", data[0]);
return FALSE;
}
}
static gboolean
gst_mpegts_demux_is_PMT (GstMpegTSDemux * demux, guint16 PID)
{
GstMpegTSStream *stream;
GstMpegTSPAT *PAT;
gint i;
/* get the PAT */
stream = demux->streams[PID_PROGRAM_ASSOCIATION_TABLE];
if (stream == NULL || stream->PAT.entries == NULL)
return FALSE;
PAT = &stream->PAT;
for (i = 0; i < PAT->entries->len; i++) {
GstMpegTSPATEntry *entry;
entry = &g_array_index (PAT->entries, GstMpegTSPATEntry, i);
if (!entry)
continue;
if (entry->PID == PID)
return TRUE;
}
return FALSE;
}
static FORCE_INLINE GstFlowReturn
gst_mpegts_stream_pes_buffer_flush (GstMpegTSStream * stream, gboolean discard)
{
GstFlowReturn ret = GST_FLOW_OK;
if (stream->pes_buffer) {
if (discard) {
gst_buffer_unref (stream->pes_buffer);
stream->pes_buffer_in_sync = FALSE;
} else {
GST_BUFFER_SIZE (stream->pes_buffer) = stream->pes_buffer_used;
ret = gst_pes_filter_push (&stream->filter, stream->pes_buffer);
if (ret == GST_FLOW_LOST_SYNC)
stream->pes_buffer_in_sync = FALSE;
}
stream->pes_buffer = NULL;
}
return ret;
}
static FORCE_INLINE GstFlowReturn
gst_mpegts_stream_pes_buffer_push (GstMpegTSStream * stream,
const guint8 * in_data, guint in_size)
{
GstFlowReturn ret = GST_FLOW_OK;
guint8 *out_data;
if (G_UNLIKELY (stream->pes_buffer
&& stream->pes_buffer_used + in_size > stream->pes_buffer_size)) {
GST_DEBUG ("stream with PID 0x%04x have PES buffer full at %u bytes."
" Flushing and growing the buffer",
stream->PID, stream->pes_buffer_size);
stream->pes_buffer_overflow = TRUE;
if (stream->pes_buffer_size < (MPEGTS_MAX_PES_BUFFER_SIZE >> 1))
stream->pes_buffer_size <<= 1;
ret = gst_mpegts_stream_pes_buffer_flush (stream, FALSE);
if (ret == GST_FLOW_LOST_SYNC)
goto done;
}
if (G_UNLIKELY (!stream->pes_buffer)) {
/* set initial size of PES buffer */
if (G_UNLIKELY (stream->pes_buffer_size == 0))
stream->pes_buffer_size = MPEGTS_MIN_PES_BUFFER_SIZE;
stream->pes_buffer = gst_buffer_new_and_alloc (stream->pes_buffer_size);
stream->pes_buffer_used = 0;
}
out_data = GST_BUFFER_DATA (stream->pes_buffer) + stream->pes_buffer_used;
oil_memcpy (out_data, in_data, in_size);
stream->pes_buffer_used += in_size;
done:
return ret;
}
static FORCE_INLINE GstFlowReturn
gst_mpegts_demux_pes_buffer_flush (GstMpegTSDemux * demux, gboolean discard)
{
gint i;
GstFlowReturn ret = GST_FLOW_OK;
for (i = 0; i < MPEGTS_MAX_PID + 1; i++) {
GstMpegTSStream *stream = demux->streams[i];
if (stream && stream->pad) {
gst_mpegts_stream_pes_buffer_flush (stream, discard);
stream->pes_buffer_in_sync = FALSE;
}
}
return ret;
}
static FORCE_INLINE GstFlowReturn
gst_mpegts_demux_push_fragment (GstMpegTSStream * stream,
const guint8 * in_data, guint in_size)
{
GstFlowReturn ret;
GstBuffer *es_buf = gst_buffer_new_and_alloc (in_size);
oil_memcpy (GST_BUFFER_DATA (es_buf), in_data, in_size);
ret = gst_pes_filter_push (&stream->filter, es_buf);
/* If PES filter return ok then PES fragment buffering
* can be enabled */
if (ret == GST_FLOW_OK)
stream->pes_buffer_in_sync = TRUE;
else if (ret == GST_FLOW_LOST_SYNC)
stream->pes_buffer_in_sync = FALSE;
return ret;
}
/*
* transport_packet(){
* sync_byte 8 bslbf == 0x47
* transport_error_indicator 1 bslbf
* payload_unit_start_indicator 1 bslbf
* transport _priority 1 bslbf
* PID 13 uimsbf
* transport_scrambling_control 2 bslbf
* adaptation_field_control 2 bslbf
* continuity_counter 4 uimsbf
* if(adaptation_field_control=='10' || adaptation_field_control=='11'){
* adaptation_field()
* }
* if(adaptation_field_control=='01' || adaptation_field_control=='11') {
* for (i=0;i<N;i++){
* data_byte 8 bslbf
* }
* }
* }
*/
static FORCE_INLINE GstFlowReturn
gst_mpegts_demux_parse_stream (GstMpegTSDemux * demux, GstMpegTSStream * stream,
const guint8 * in_data, guint in_size)
{
GstFlowReturn ret;
gboolean transport_error_indicator;
gboolean payload_unit_start_indicator;
gboolean transport_priority;
guint16 PID;
guint8 transport_scrambling_control;
guint8 adaptation_field_control;
guint8 continuity_counter;
const guint8 *data = in_data;
guint datalen = in_size;
transport_error_indicator = (data[0] & 0x80) == 0x80;
payload_unit_start_indicator = (data[0] & 0x40) == 0x40;
transport_priority = (data[0] & 0x20) == 0x20;
PID = stream->PID;
transport_scrambling_control = (data[2] & 0xc0) >> 6;
adaptation_field_control = (data[2] & 0x30) >> 4;
continuity_counter = data[2] & 0x0f;
data += 3;
datalen -= 3;
GST_LOG_OBJECT (demux, "afc 0x%x, pusi %d, PID 0x%04x datalen %u",
adaptation_field_control, payload_unit_start_indicator, PID, datalen);
ret = GST_FLOW_OK;
/* packets with adaptation_field_control == 0 must be skipped */
if (adaptation_field_control == 0)
goto skip;
/* parse adaption field if any */
if (adaptation_field_control & 0x2) {
guint consumed;
if (!gst_mpegts_demux_parse_adaptation_field (stream, data,
datalen, &consumed))
goto done;
if (datalen <= consumed)
goto too_small;
data += consumed;
datalen -= consumed;
GST_LOG_OBJECT (demux, "consumed: %u datalen: %u", consumed, datalen);
}
/* If this packet has a payload, handle it */
if (adaptation_field_control & 0x1) {
GST_LOG_OBJECT (demux, "Packet payload %d bytes, PID 0x%04x", datalen, PID);
/* For unknown streams, check if the PID is in the partial PIDs
* list as an elementary stream and override the type if so
*/
if (G_UNLIKELY (stream->PID_type == PID_TYPE_UNKNOWN)) {
if (mpegts_is_elem_pid (demux, PID)) {
GST_DEBUG_OBJECT (demux,
"PID 0x%04x is an elementary stream in the PID list", PID);
stream->PID_type = PID_TYPE_ELEMENTARY;
stream->flags |= MPEGTS_STREAM_FLAG_STREAM_TYPE_UNKNOWN;
stream->base_time = 0;
stream->last_time = 0;
/* Clear any existing descriptor */
if (stream->ES_info) {
gst_mpeg_descriptor_free (stream->ES_info);
stream->ES_info = NULL;
}
/* Initialise our PES filter */
gst_pes_filter_init (&stream->filter, NULL, NULL);
gst_pes_filter_set_callbacks (&stream->filter,
(GstPESFilterData) gst_mpegts_demux_data_cb,
(GstPESFilterResync) gst_mpegts_demux_resync_cb, stream);
}
}
/* now parse based on the stream type */
switch (stream->PID_type) {
case PID_TYPE_PROGRAM_ASSOCIATION:
case PID_TYPE_CONDITIONAL_ACCESS:
case PID_TYPE_PROGRAM_MAP:
case PID_TYPE_PRIVATE_SECTION:
{
GstBuffer *sec_buf;
guint8 *section_data;
guint16 section_length;
guint8 pointer;
/* do stuff with our section */
if (payload_unit_start_indicator) {
pointer = *data++;
datalen -= 1;
if (pointer >= datalen) {
GST_DEBUG_OBJECT (demux, "pointer: 0x%02x too large", pointer);
return GST_FLOW_OK;
}
data += pointer;
datalen -= pointer;
}
/* FIXME: try to use data directly instead of creating a buffer and
pushing in into adapter at section filter */
sec_buf = gst_buffer_new_and_alloc (datalen);
oil_memcpy (GST_BUFFER_DATA (sec_buf), data, datalen);
if (gst_section_filter_push (&stream->section_filter,
payload_unit_start_indicator, continuity_counter, sec_buf)) {
GST_DEBUG_OBJECT (demux, "section finished");
/* section ready */
section_length = stream->section_filter.section_length;
section_data =
(guint8 *) gst_adapter_peek (stream->section_filter.adapter,
section_length + 3);
switch (stream->PID_type) {
case PID_TYPE_PROGRAM_ASSOCIATION:
gst_mpegts_stream_parse_pat (stream, section_data,
section_length + 3);
break;
case PID_TYPE_CONDITIONAL_ACCESS:
gst_mpegts_stream_parse_cat (stream, section_data,
section_length + 3);
break;
case PID_TYPE_PROGRAM_MAP:
gst_mpegts_stream_parse_pmt (stream, section_data,
section_length + 3);
break;
case PID_TYPE_PRIVATE_SECTION:
gst_mpegts_stream_parse_private_section (stream, section_data,
section_length + 3);
break;
}
gst_section_filter_clear (&stream->section_filter);
} else {
/* section still going, don't parse left */
GST_DEBUG_OBJECT (demux, "section still going for PID 0x%04x", PID);
}
break;
}
case PID_TYPE_NULL_PACKET:
GST_DEBUG_OBJECT (demux,
"skipping PID 0x%04x, type 0x%04x (NULL packet)", PID,
stream->PID_type);
break;
case PID_TYPE_UNKNOWN:
GST_DEBUG_OBJECT (demux, "skipping unknown PID 0x%04x, type 0x%04x",
PID, stream->PID_type);
break;
case PID_TYPE_ELEMENTARY:
{
if (payload_unit_start_indicator) {
GST_DEBUG_OBJECT (demux, "new PES start for PID 0x%04x, used %u"
"bytes of %u bytes in the PES buffer",
PID, stream->pes_buffer_used, stream->pes_buffer_size);
/* Flush buffered PES data */
gst_mpegts_stream_pes_buffer_flush (stream, FALSE);
gst_pes_filter_drain (&stream->filter);
/* Resize the buffer to half if no overflow detected and
* had been used less than half of it */
if (stream->pes_buffer_overflow == FALSE
&& stream->pes_buffer_used < (stream->pes_buffer_size >> 1)) {
stream->pes_buffer_size >>= 1;
if (stream->pes_buffer_size < MPEGTS_MIN_PES_BUFFER_SIZE)
stream->pes_buffer_size = MPEGTS_MIN_PES_BUFFER_SIZE;
GST_DEBUG_OBJECT (demux, "PES buffer size reduced to %u bytes",
stream->pes_buffer_size);
}
/* mark the stream not in sync to give a chance on PES filter to
* detect lost sync */
stream->pes_buffer_in_sync = FALSE;
stream->pes_buffer_overflow = FALSE;
}
GST_LOG_OBJECT (demux, "Elementary packet of size %u for PID 0x%04x",
datalen, PID);
if (datalen > 0) {
if (!stream->pes_buffer_in_sync) {
/* Push the first fragment to PES filter to have a chance to
* detect GST_FLOW_LOST_SYNC.
*/
GST_LOG_OBJECT (demux, "fragment directly pushed to PES filter");
ret = gst_mpegts_demux_push_fragment (stream, data, datalen);
} else {
/* Otherwhise we buffer the PES fragment */
ret = gst_mpegts_stream_pes_buffer_push (stream, data, datalen);
/* If sync is lost here is due a pes_buffer_flush and we can try
* to resync in the PES filter with the current fragment
*/
if (ret == GST_FLOW_LOST_SYNC) {
GST_LOG_OBJECT (demux, "resync, fragment pushed to PES filter");
ret = gst_mpegts_demux_push_fragment (stream, data, datalen);
}
}
break;
} else {
GST_WARNING_OBJECT (demux, "overflow of datalen: %u so skipping",
datalen);
return GST_FLOW_OK;
}
}
}
}
done:
return ret;
skip:
{
GST_DEBUG_OBJECT (demux, "skipping, adaptation_field_control == 0");
return GST_FLOW_OK;
}
too_small:
{
GST_DEBUG_OBJECT (demux, "skipping, adaptation_field consumed all data");
return GST_FLOW_OK;
}
}
static FORCE_INLINE GstFlowReturn
gst_mpegts_demux_parse_transport_packet (GstMpegTSDemux * demux,
const guint8 * data)
{
GstFlowReturn ret = GST_FLOW_OK;
guint16 PID;
GstMpegTSStream *stream;
/* skip sync byte */
data++;
/* get PID */
PID = ((data[0] & 0x1f) << 8) | data[1];
/* Skip NULL packets */
if (G_UNLIKELY (PID == 0x1fff))
goto beach;
/* get the stream. */
stream = gst_mpegts_demux_get_stream_for_PID (demux, PID);
/* parse the stream */
ret = gst_mpegts_demux_parse_stream (demux, stream, data,
MPEGTS_NORMAL_TS_PACKETSIZE - 1);
if (demux->pcr[1] != -1 && demux->bitrate == -1) {
guint64 bitrate;
GST_DEBUG_OBJECT (demux, "pcr[0]:%" G_GUINT64_FORMAT, demux->pcr[0]);
GST_DEBUG_OBJECT (demux, "pcr[1]:%" G_GUINT64_FORMAT, demux->pcr[1]);
GST_DEBUG_OBJECT (demux, "diff in time %" GST_TIME_FORMAT,
GST_TIME_ARGS (MPEGTIME_TO_GSTTIME (demux->pcr[1] - demux->pcr[0])));
GST_DEBUG_OBJECT (demux, "stream->last_PCR_difference: %" G_GUINT64_FORMAT
", demux->num_packets %" G_GUINT64_FORMAT,
demux->pcr[1] - demux->pcr[0], demux->num_packets);
bitrate = gst_util_uint64_scale (GST_SECOND,
MPEGTS_NORMAL_TS_PACKETSIZE * demux->num_packets,
MPEGTIME_TO_GSTTIME (demux->pcr[1] - demux->pcr[0]));
/* somehow... I doubt a bitrate below one packet per second is valid */
if (bitrate > MPEGTS_NORMAL_TS_PACKETSIZE - 1) {
demux->bitrate = bitrate;
GST_DEBUG_OBJECT (demux, "bitrate is %" G_GINT64_FORMAT
" bytes per second", demux->bitrate);
} else {
GST_WARNING_OBJECT (demux, "Couldn't compute valid bitrate, recomputing");
demux->pcr[0] = demux->pcr[1] = -1;
demux->num_packets = -1;
}
}
beach:
demux->num_packets++;
return ret;
/* ERRORS */
}
static gboolean
gst_mpegts_demux_handle_seek_push (GstMpegTSDemux * demux, GstEvent * event)
{
gboolean res = FALSE;
gdouble rate;
GstFormat format;
GstSeekFlags flags;
GstSeekType start_type, stop_type;
gint64 start, stop, bstart, bstop;
GstEvent *bevent;
gst_event_parse_seek (event, &rate, &format, &flags, &start_type, &start,
&stop_type, &stop);
GST_DEBUG_OBJECT (demux, "seek event, rate: %f start: %" GST_TIME_FORMAT
" stop: %" GST_TIME_FORMAT, rate, GST_TIME_ARGS (start),
GST_TIME_ARGS (stop));
if (format == GST_FORMAT_BYTES) {
GST_DEBUG_OBJECT (demux, "seek not supported on format %d", format);
goto beach;
}
GST_DEBUG_OBJECT (demux, "seek - trying directly upstream first");
/* first try original format seek */
res = gst_pad_push_event (demux->sinkpad, gst_event_ref (event));
if (res == TRUE)
goto beach;
GST_DEBUG_OBJECT (demux, "seek - no upstream");
if (format != GST_FORMAT_TIME) {
/* From here down, we only support time based seeks */
GST_DEBUG_OBJECT (demux, "seek not supported on format %d", format);
goto beach;
}
/* We need to convert to byte based seek and we need a scr_rate for that. */
if (demux->bitrate == -1) {
GST_DEBUG_OBJECT (demux, "seek not possible, no bitrate");
goto beach;
}
GST_DEBUG_OBJECT (demux, "try with bitrate");
bstart = GSTTIME_TO_BYTES (start);
bstop = GSTTIME_TO_BYTES (stop);
GST_DEBUG_OBJECT (demux, "in bytes bstart %" G_GINT64_FORMAT " bstop %"
G_GINT64_FORMAT, bstart, bstop);
bevent = gst_event_new_seek (rate, GST_FORMAT_BYTES, flags, start_type,
bstart, stop_type, bstop);
res = gst_pad_push_event (demux->sinkpad, bevent);
beach:
gst_event_unref (event);
return res;
}
static gboolean
gst_mpegts_demux_src_event (GstPad * pad, GstEvent * event)
{
GstMpegTSDemux *demux = GST_MPEGTS_DEMUX (gst_pad_get_parent (pad));
gboolean res = FALSE;
GST_DEBUG_OBJECT (demux, "got event %s",
gst_event_type_get_name (GST_EVENT_TYPE (event)));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_SEEK:
res = gst_mpegts_demux_handle_seek_push (demux, event);
break;
default:
res = gst_pad_push_event (demux->sinkpad, event);
break;
}
gst_object_unref (demux);
return res;
}
static void
gst_mpegts_demux_flush (GstMpegTSDemux * demux, gboolean discard)
{
gint i;
GstMpegTSStream *PCR_stream;
GstMpegTSStream *PMT_stream;
GST_DEBUG_OBJECT (demux, "flushing MPEG TS demuxer (discard %d)", discard);
/* Start by flushing internal buffers */
gst_mpegts_demux_pes_buffer_flush (demux, discard);
/* Clear adapter */
gst_adapter_clear (demux->adapter);
/* Try resetting the last_PCR value as we will have a discont */
if (demux->current_PMT == 0)
goto beach;
PMT_stream = demux->streams[demux->current_PMT];
if (PMT_stream == NULL)
goto beach;
PCR_stream = demux->streams[PMT_stream->PMT.PCR_PID];
if (PCR_stream == NULL)
goto beach;
PCR_stream->last_PCR = -1;
/* Reset last time of all streams */
for (i = 0; i < MPEGTS_MAX_PID + 1; i++) {
GstMpegTSStream *stream = demux->streams[i];
if (stream)
stream->last_time = 0;
}
beach:
return;
}
static gboolean
gst_mpegts_demux_send_event (GstMpegTSDemux * demux, GstEvent * event)
{
gint i;
gboolean have_stream = FALSE, res = TRUE;
for (i = 0; i < MPEGTS_MAX_PID + 1; i++) {
GstMpegTSStream *stream = demux->streams[i];
if (stream && stream->pad) {
res &= gst_pad_push_event (stream->pad, gst_event_ref (event));
have_stream = TRUE;
}
}
gst_event_unref (event);
return have_stream;
}
static gboolean
gst_mpegts_demux_sink_event (GstPad * pad, GstEvent * event)
{
GstMpegTSDemux *demux = GST_MPEGTS_DEMUX (gst_pad_get_parent (pad));
gboolean res = FALSE;
GST_DEBUG_OBJECT (demux, "got event %s",
gst_event_type_get_name (GST_EVENT_TYPE (event)));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_START:
res = gst_mpegts_demux_send_event (demux, event);
break;
case GST_EVENT_FLUSH_STOP:
gst_adapter_clear (demux->adapter);
gst_mpegts_demux_flush (demux, TRUE);
res = gst_mpegts_demux_send_event (demux, event);
break;
case GST_EVENT_EOS:
gst_mpegts_demux_flush (demux, FALSE);
/* Send the EOS event on each stream */
if (!(res = gst_mpegts_demux_send_event (demux, event))) {
/* we have no streams */
GST_ELEMENT_ERROR (demux, STREAM, TYPE_NOT_FOUND,
(NULL), ("No valid streams found at EOS"));
}
break;
case GST_EVENT_NEWSEGMENT:
{
gboolean update;
gdouble rate;
GstFormat format;
gint64 start, stop, time;
gst_event_parse_new_segment (event, &update, &rate, &format,
&start, &stop, &time);
gst_event_unref (event);
GST_INFO_OBJECT (demux, "received new segment: rate %g "
"format %d, start: %" G_GINT64_FORMAT ", stop: %" G_GINT64_FORMAT
", time: %" G_GINT64_FORMAT, rate, format, start, stop, time);
if (format == GST_FORMAT_BYTES && demux->bitrate != -1) {
gint64 tstart = 0, tstop = 0, pos = 0;
if (demux->base_pts != GST_CLOCK_TIME_NONE) {
tstart = tstop = demux->base_pts;
}
tstart += BYTES_TO_GSTTIME (start);
tstop += BYTES_TO_GSTTIME (stop);
pos = BYTES_TO_GSTTIME (time);
event = gst_event_new_new_segment (update, rate,
GST_FORMAT_TIME, tstart, tstop, pos);
GST_DEBUG_OBJECT (demux, "pushing time newsegment from %"
GST_TIME_FORMAT " to %" GST_TIME_FORMAT " pos %" GST_TIME_FORMAT,
GST_TIME_ARGS (tstart), GST_TIME_ARGS (tstop), GST_TIME_ARGS (pos));
res = gst_mpegts_demux_send_event (demux, event);
}
break;
}
default:
res = gst_mpegts_demux_send_event (demux, event);
break;
}
gst_object_unref (demux);
return res;
}
static gboolean
gst_mpegts_demux_provides_clock (GstElement * element)
{
GstMpegTSDemux *demux;
GstQuery *query;
gboolean is_live = FALSE;
GstPad *peer;
demux = GST_MPEGTS_DEMUX (element);
query = gst_query_new_latency ();
peer = gst_pad_get_peer (demux->sinkpad);
if (peer) {
if (gst_pad_query (peer, query))
gst_query_parse_latency (query, &is_live, NULL, NULL);
gst_object_unref (peer);
}
gst_query_unref (query);
return is_live;
}
static GstClock *
gst_mpegts_demux_provide_clock (GstElement * element)
{
GstMpegTSDemux *demux = GST_MPEGTS_DEMUX (element);
if (gst_mpegts_demux_provides_clock (element)) {
if (demux->clock == NULL) {
demux->clock = g_object_new (GST_TYPE_SYSTEM_CLOCK, "name",
"MpegTSClock", NULL);
demux->clock_base = GST_CLOCK_TIME_NONE;
}
return gst_object_ref (demux->clock);
}
return NULL;
}
static const GstQueryType *
gst_mpegts_demux_src_pad_query_type (GstPad * pad)
{
static const GstQueryType types[] = {
GST_QUERY_LATENCY,
GST_QUERY_DURATION,
GST_QUERY_SEEKING,
0
};
return types;
}
static gboolean
gst_mpegts_demux_src_pad_query (GstPad * pad, GstQuery * query)
{
GstMpegTSDemux *demux = GST_MPEGTS_DEMUX (gst_pad_get_parent (pad));
gboolean res = FALSE;
GstPad *peer;
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_LATENCY:
{
peer = gst_pad_get_peer (demux->sinkpad);
if (peer) {
res = gst_pad_query (peer, query);
if (res) {
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);
}
gst_object_unref (peer);
}
break;
}
case GST_QUERY_DURATION:
{
GstFormat format;
GstPad *peer;
gst_query_parse_duration (query, &format, NULL);
/* Try query upstream first */
peer = gst_pad_get_peer (demux->sinkpad);
if (peer) {
res = gst_pad_query (peer, query);
/* Try doing something with that query if it failed */
if (!res && format == GST_FORMAT_TIME && demux->bitrate != -1) {
/* Try using cache first */
if (GST_CLOCK_TIME_IS_VALID (demux->cache_duration)) {
GST_LOG_OBJECT (demux, "replying duration query from cache %"
GST_TIME_FORMAT, GST_TIME_ARGS (demux->cache_duration));
gst_query_set_duration (query, GST_FORMAT_TIME,
demux->cache_duration);
res = TRUE;
} else { /* Query upstream and approximate */
GstQuery *bquery = gst_query_new_duration (GST_FORMAT_BYTES);
gint64 duration = 0;
/* Query peer for duration in bytes */
res = gst_pad_query (peer, bquery);
if (res) {
/* Convert to time format */
gst_query_parse_duration (bquery, &format, &duration);
GST_DEBUG_OBJECT (demux, "query on peer pad reported bytes %"
G_GUINT64_FORMAT, duration);
demux->cache_duration = BYTES_TO_GSTTIME (duration);
GST_DEBUG_OBJECT (demux, "converted to time %" GST_TIME_FORMAT,
GST_TIME_ARGS (demux->cache_duration));
gst_query_set_duration (query, GST_FORMAT_TIME,
demux->cache_duration);
}
gst_query_unref (bquery);
}
} else {
GST_WARNING_OBJECT (demux, "unsupported query format or no bitrate "
"yet to approximate duration from bytes");
}
gst_object_unref (peer);
}
break;
}
case GST_QUERY_SEEKING:{
GstFormat fmt;
gst_query_parse_seeking (query, &fmt, NULL, NULL, NULL);
if (fmt == GST_FORMAT_BYTES) {
/* Seeking in BYTES format not supported at all */
gst_query_set_seeking (query, fmt, FALSE, -1, -1);
} else {
GstQuery *peerquery;
gboolean seekable;
/* Then ask upstream */
res = gst_pad_peer_query (demux->sinkpad, query);
if (res) {
/* If upstream can handle seeks we're done, if it
* can't we still have our TIME->BYTES conversion seek
*/
gst_query_parse_seeking (query, NULL, &seekable, NULL, NULL);
if (seekable || fmt != GST_FORMAT_TIME)
goto beach;
}
/* We can't say anything about seekability if we didn't
* have a second PCR yet because the bitrate is calculated
* from this
*/
if (demux->bitrate == -1 && demux->pcr[1] == -1)
goto beach;
/* We can seek if upstream supports BYTES seeks and we
* have a bitrate
*/
peerquery = gst_query_new_seeking (GST_FORMAT_BYTES);
res = gst_pad_peer_query (demux->sinkpad, peerquery);
if (!res || demux->bitrate == -1) {
gst_query_set_seeking (query, fmt, FALSE, -1, -1);
} else {
gst_query_parse_seeking (peerquery, NULL, &seekable, NULL, NULL);
if (seekable)
gst_query_set_seeking (query, GST_FORMAT_TIME, TRUE, 0, -1);
else
gst_query_set_seeking (query, fmt, FALSE, -1, -1);
}
gst_query_unref (peerquery);
res = TRUE;
}
break;
}
default:
res = gst_pad_query_default (pad, query);
break;
}
beach:
gst_object_unref (demux);
return res;
}
static FORCE_INLINE gint
is_mpegts_sync (const guint8 * in_data, const guint8 * end_data,
guint packetsize)
{
guint ret = 0;
if (G_LIKELY (IS_MPEGTS_SYNC (in_data)))
return 100;
if (in_data + packetsize < end_data - 5) {
if (G_LIKELY (IS_MPEGTS_SYNC (in_data + packetsize)))
ret += 50;
}
if (in_data[0] == 0x47) {
ret += 25;
if ((in_data[1] & 0x80) == 0x00)
ret += 10;
if ((in_data[3] & 0x10) == 0x10)
ret += 5;
}
return ret;
}
static inline void
gst_mpegts_demux_detect_packet_size (GstMpegTSDemux * demux, guint len)
{
guint i, packetsize;
for (i = 1; i < len; i++) {
packetsize = demux->sync_lut[i] - demux->sync_lut[i - 1];
if (packetsize == MPEGTS_NORMAL_TS_PACKETSIZE ||
packetsize == MPEGTS_M2TS_TS_PACKETSIZE ||
packetsize == MPEGTS_DVB_ASI_TS_PACKETSIZE ||
packetsize == MPEGTS_ATSC_TS_PACKETSIZE)
goto done;
else
packetsize = 0;
}
done:
demux->packetsize = (packetsize ? packetsize : MPEGTS_NORMAL_TS_PACKETSIZE);
GST_DEBUG_OBJECT (demux, "packet_size set to %d bytes", demux->packetsize);
}
static FORCE_INLINE guint
gst_mpegts_demux_sync_scan (GstMpegTSDemux * demux, const guint8 * in_data,
guint size, guint * flush)
{
guint sync_count = 0;
const guint8 *end_scan = in_data + size - demux->packetsize;
guint8 *ptr_data = (guint8 *) in_data;
guint packetsize =
(demux->packetsize ? demux->packetsize : MPEGTS_NORMAL_TS_PACKETSIZE);
/* Check if the LUT table is big enough */
if (G_UNLIKELY (demux->sync_lut_len < (size / packetsize))) {
demux->sync_lut_len = size / packetsize;
if (demux->sync_lut)
g_free (demux->sync_lut);
demux->sync_lut = g_new0 (guint8 *, demux->sync_lut_len);
GST_DEBUG_OBJECT (demux, "created sync LUT table with %u entries",
demux->sync_lut_len);
}
while (ptr_data <= end_scan && sync_count < demux->sync_lut_len) {
/* if sync code is found try to store it in the LUT */
guint chance = is_mpegts_sync (ptr_data, end_scan, packetsize);
if (G_LIKELY (chance > 50)) {
/* skip paketsize bytes and try find next */
guint8 *next_sync = ptr_data + packetsize;
if (next_sync < end_scan) {
demux->sync_lut[sync_count] = ptr_data;
sync_count++;
ptr_data += packetsize;
} else
goto done;
} else {
ptr_data++;
}
}
done:
if (G_UNLIKELY (!demux->packetsize))
gst_mpegts_demux_detect_packet_size (demux, sync_count);
*flush = ptr_data - in_data;
return sync_count;
}
static GstFlowReturn
gst_mpegts_demux_chain (GstPad * pad, GstBuffer * buffer)
{
GstMpegTSDemux *demux = GST_MPEGTS_DEMUX (gst_pad_get_parent (pad));
GstFlowReturn ret = GST_FLOW_OK;
const guint8 *data;
guint avail;
guint flush = 0;
gint i;
guint sync_count;
if (GST_BUFFER_IS_DISCONT (buffer)) {
gst_mpegts_demux_flush (demux, FALSE);
}
/* first push the new buffer into the adapter */
gst_adapter_push (demux->adapter, buffer);
/* check if there's enough data to parse a packet */
avail = gst_adapter_available (demux->adapter);
if (G_UNLIKELY (avail < demux->packetsize))
goto done;
/* recover all data from adapter */
data = gst_adapter_peek (demux->adapter, avail);
/* scan for sync codes */
sync_count = gst_mpegts_demux_sync_scan (demux, data, avail, &flush);
/* process all packets */
for (i = 0; i < sync_count; i++) {
ret = gst_mpegts_demux_parse_transport_packet (demux, demux->sync_lut[i]);
if (G_UNLIKELY (ret == GST_FLOW_LOST_SYNC
|| ret == GST_FLOW_NEED_MORE_DATA)) {
ret = GST_FLOW_OK;
continue;
}
if (G_UNLIKELY (ret != GST_FLOW_OK)) {
flush = demux->sync_lut[i] - data + demux->packetsize;
flush = MIN (avail, flush);
goto done;
}
}
done:
/* flush processed data */
if (flush) {
GST_DEBUG_OBJECT (demux, "flushing %d/%d", flush, avail);
gst_adapter_flush (demux->adapter, flush);
}
gst_object_unref (demux);
return ret;
}
static GstStateChangeReturn
gst_mpegts_demux_change_state (GstElement * element, GstStateChange transition)
{
GstMpegTSDemux *demux = GST_MPEGTS_DEMUX (element);
GstStateChangeReturn result;
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
demux->adapter = gst_adapter_new ();
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
break;
default:
break;
}
result = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_READY:
gst_mpegts_demux_reset (demux);
break;
case GST_STATE_CHANGE_READY_TO_NULL:
g_object_unref (demux->adapter);
if (demux->sync_lut)
g_free (demux->sync_lut);
demux->sync_lut = NULL;
demux->sync_lut_len = 0;
break;
default:
break;
}
return result;
}
static GValueArray *
mpegts_demux_build_pat_info (GstMpegTSDemux * demux)
{
GValueArray *vals = NULL;
GstMpegTSPAT *PAT;
gint i;
g_return_val_if_fail (demux->streams[0] != NULL, NULL);
g_return_val_if_fail (demux->streams[0]->PID_type ==
PID_TYPE_PROGRAM_ASSOCIATION, NULL);
PAT = &(demux->streams[0]->PAT);
vals = g_value_array_new (PAT->entries->len);
for (i = 0; i < PAT->entries->len; i++) {
GstMpegTSPATEntry *cur_entry =
&g_array_index (PAT->entries, GstMpegTSPATEntry, i);
GValue v = { 0, };
MpegTsPatInfo *info_obj;
info_obj = mpegts_pat_info_new (cur_entry->program_number, cur_entry->PID);
g_value_init (&v, G_TYPE_OBJECT);
g_value_take_object (&v, info_obj);
g_value_array_append (vals, &v);
}
return vals;
}
static MpegTsPmtInfo *
mpegts_demux_build_pmt_info (GstMpegTSDemux * demux, guint16 pmt_pid)
{
MpegTsPmtInfo *info_obj;
GstMpegTSPMT *PMT;
gint i;
g_return_val_if_fail (demux->streams[pmt_pid] != NULL, NULL);
g_return_val_if_fail (demux->streams[pmt_pid]->PID_type ==
PID_TYPE_PROGRAM_MAP, NULL);
PMT = &(demux->streams[pmt_pid]->PMT);
info_obj = mpegts_pmt_info_new (PMT->program_number, PMT->PCR_PID,
PMT->version_number);
for (i = 0; i < PMT->entries->len; i++) {
GstMpegTSStream *stream;
MpegTsPmtStreamInfo *stream_info;
GstMpegTSPMTEntry *cur_entry =
&g_array_index (PMT->entries, GstMpegTSPMTEntry, i);
stream = demux->streams[cur_entry->PID];
stream_info =
mpegts_pmt_stream_info_new (cur_entry->PID, stream->stream_type);
if (stream->ES_info) {
int i;
/* add languages */
guint8 *iso639_languages =
gst_mpeg_descriptor_find (stream->ES_info, DESC_ISO_639_LANGUAGE);
if (iso639_languages) {
for (i = 0; i < DESC_ISO_639_LANGUAGE_codes_n (iso639_languages); i++) {
gchar *language_n = (gchar *)
DESC_ISO_639_LANGUAGE_language_code_nth (iso639_languages, i);
mpegts_pmt_stream_info_add_language (stream_info,
g_strndup (language_n, 3));
}
}
for (i = 0; i < gst_mpeg_descriptor_n_desc (stream->ES_info); ++i) {
guint8 *desc = gst_mpeg_descriptor_nth (stream->ES_info, i);
/* add the whole descriptor, tag + length + DESC_LENGTH bytes */
mpegts_pmt_stream_info_add_descriptor (stream_info,
(gchar *) desc, 2 + DESC_LENGTH (desc));
}
}
mpegts_pmt_info_add_stream (info_obj, stream_info);
}
return info_obj;
}
static void
gst_mpegts_demux_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstMpegTSDemux *demux = GST_MPEGTS_DEMUX (object);
gchar **pids;
guint num_pids;
int i;
switch (prop_id) {
case PROP_ES_PIDS:
pids = g_strsplit (g_value_get_string (value), ":", -1);
num_pids = g_strv_length (pids);
if (num_pids > 0) {
demux->elementary_pids = g_new0 (guint16, num_pids);
demux->nb_elementary_pids = num_pids;
for (i = 0; i < num_pids; i++) {
demux->elementary_pids[i] = strtol (pids[i], NULL, 0);
GST_INFO ("partial TS ES pid %d", demux->elementary_pids[i]);
}
}
g_strfreev (pids);
break;
case PROP_CHECK_CRC:
demux->check_crc = g_value_get_boolean (value);
break;
case PROP_PROGRAM_NUMBER:
demux->program_number = g_value_get_int (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_mpegts_demux_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstMpegTSDemux *demux = GST_MPEGTS_DEMUX (object);
int i;
switch (prop_id) {
case PROP_ES_PIDS:
if (demux->nb_elementary_pids == 0) {
g_value_set_static_string (value, "");
} else {
gchar **ts_pids;
ts_pids = g_new0 (gchar *, demux->nb_elementary_pids + 1);
for (i = 0; i < demux->nb_elementary_pids; i++) {
ts_pids[i] = g_strdup_printf ("%d", demux->elementary_pids[i]);
}
g_value_set_string (value, g_strjoinv (":", ts_pids));
g_strfreev (ts_pids);
}
break;
case PROP_CHECK_CRC:
g_value_set_boolean (value, demux->check_crc);
break;
case PROP_PROGRAM_NUMBER:
g_value_set_int (value, demux->program_number);
break;
case PROP_PAT_INFO:
{
if (demux->streams[0] != NULL) {
g_value_take_boxed (value, mpegts_demux_build_pat_info (demux));
}
break;
}
case PROP_PMT_INFO:
{
if (demux->current_PMT != 0 && demux->streams[demux->current_PMT] != NULL) {
g_value_take_object (value, mpegts_demux_build_pmt_info (demux,
demux->current_PMT));
}
break;
}
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
gboolean
gst_mpegts_demux_plugin_init (GstPlugin * plugin)
{
if (!gst_element_register (plugin, "mpegtsdemux",
GST_RANK_PRIMARY, GST_TYPE_MPEGTS_DEMUX))
return FALSE;
return TRUE;
}
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