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gstreamer/gst/mpegtsdemux/tsdemux.c

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/*
* tsdemux.c
* Copyright (C) 2009 Zaheer Abbas Merali
* 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:
* 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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdlib.h>
#include <string.h>
#include <glib.h>
#include "mpegtsbase.h"
#include "tsdemux.h"
#include "gstmpegdesc.h"
#include "gstmpegdefs.h"
#include "mpegtspacketizer.h"
#include "payload_parsers.h"
#include "pesparse.h"
/*
* tsdemux
*
* See TODO for explanations on improvements needed
*/
/* latency in mseconds */
#define TS_LATENCY 700
#define TABLE_ID_UNSET 0xFF
/* Size of the pendingbuffers array. */
#define TS_MAX_PENDING_BUFFERS 256
#define PCR_WRAP_SIZE_128KBPS (((gint64)1490)*(1024*1024))
/* small PCR for wrap detection */
#define PCR_SMALL 17775000
/* maximal PCR time */
#define PCR_MAX_VALUE (((((guint64)1)<<33) * 300) + 298)
/* seek to SEEK_TIMESTAMP_OFFSET before the desired offset and search then
* either accurately or for the next timestamp
*/
#define SEEK_TIMESTAMP_OFFSET (1000 * GST_MSECOND)
GST_DEBUG_CATEGORY_STATIC (ts_demux_debug);
#define GST_CAT_DEFAULT ts_demux_debug
static GQuark QUARK_TSDEMUX;
static GQuark QUARK_PID;
static GQuark QUARK_PCR;
static GQuark QUARK_OPCR;
static GQuark QUARK_PTS;
static GQuark QUARK_DTS;
static GQuark QUARK_OFFSET;
typedef enum
{
PENDING_PACKET_EMPTY = 0, /* No pending packet/buffer
* Push incoming buffers to the array */
PENDING_PACKET_HEADER, /* PES header needs to be parsed
* Push incoming buffers to the array */
PENDING_PACKET_BUFFER, /* Currently filling up output buffer
* Push incoming buffers to the bufferlist */
PENDING_PACKET_DISCONT /* Discontinuity in incoming packets
* Drop all incoming buffers */
} PendingPacketState;
typedef struct _TSDemuxStream TSDemuxStream;
struct _TSDemuxStream
{
MpegTSBaseStream stream;
GstPad *pad;
/* the return of the latest push */
GstFlowReturn flow_return;
/* Output data */
PendingPacketState state;
/* Pending buffers array. */
/* These buffers are stored in this array until the PES header (if needed)
* is succesfully parsed. */
GstBuffer *pendingbuffers[TS_MAX_PENDING_BUFFERS];
guint8 nbpending;
/* Current data to be pushed out */
GstBufferList *current;
GstBufferListIterator *currentit;
GList *currentlist;
/* Current PTS for this stream */
GstClockTime pts;
};
#define VIDEO_CAPS \
GST_STATIC_CAPS (\
"video/mpeg, " \
"mpegversion = (int) { 1, 2, 4 }, " \
"systemstream = (boolean) FALSE; " \
"video/x-h264,stream-format=(string)byte-stream," \
"alignment=(string)nal;" \
"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 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);
enum
{
ARG_0,
PROP_PROGRAM_NUMBER,
PROP_EMIT_STATS,
/* FILL ME */
};
/* Pad functions */
static const GstQueryType *gst_ts_demux_srcpad_query_types (GstPad * pad);
static gboolean gst_ts_demux_srcpad_query (GstPad * pad, GstQuery * query);
/* mpegtsbase methods */
static void
gst_ts_demux_program_started (MpegTSBase * base, MpegTSBaseProgram * program);
static void gst_ts_demux_reset (MpegTSBase * base);
static GstFlowReturn
gst_ts_demux_push (MpegTSBase * base, MpegTSPacketizerPacket * packet,
MpegTSPacketizerSection * section);
static void gst_ts_demux_flush (MpegTSBase * base);
static void
gst_ts_demux_stream_added (MpegTSBase * base, MpegTSBaseStream * stream,
MpegTSBaseProgram * program);
static void
gst_ts_demux_stream_removed (MpegTSBase * base, MpegTSBaseStream * stream);
static GstFlowReturn gst_ts_demux_do_seek (MpegTSBase * base, GstEvent * event,
guint16 pid);
static GstFlowReturn find_pcr_packet (MpegTSBase * base, guint64 offset,
gint64 length, TSPcrOffset * pcroffset);
static GstFlowReturn find_timestamps (MpegTSBase * base, guint64 initoff,
guint64 * offset);
static void gst_ts_demux_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_ts_demux_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void gst_ts_demux_finalize (GObject * object);
static GstFlowReturn
process_pcr (MpegTSBase * base, guint64 initoff, TSPcrOffset * pcroffset,
guint numpcr, gboolean isinitial);
static void gst_ts_demux_flush_streams (GstTSDemux * tsdemux);
static GstFlowReturn
gst_ts_demux_push_pending_data (GstTSDemux * demux, TSDemuxStream * stream);
static gboolean push_event (MpegTSBase * base, GstEvent * event);
static void _extra_init (GType type);
GST_BOILERPLATE_FULL (GstTSDemux, gst_ts_demux, MpegTSBase,
GST_TYPE_MPEGTS_BASE, _extra_init);
static void
_extra_init (GType type)
{
QUARK_TSDEMUX = g_quark_from_string ("tsdemux");
QUARK_PID = g_quark_from_string ("pid");
QUARK_PCR = g_quark_from_string ("pcr");
QUARK_OPCR = g_quark_from_string ("opcr");
QUARK_PTS = g_quark_from_string ("pts");
QUARK_DTS = g_quark_from_string ("dts");
QUARK_OFFSET = g_quark_from_string ("offset");
}
static void
gst_ts_demux_base_init (gpointer klass)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&video_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&audio_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&subpicture_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&private_template));
gst_element_class_set_details_simple (element_class,
"MPEG transport stream demuxer",
"Codec/Demuxer",
"Demuxes MPEG2 transport streams",
"Zaheer Abbas Merali <zaheerabbas at merali dot org>\n"
"Edward Hervey <edward.hervey@collabora.co.uk>");
}
static void
gst_ts_demux_class_init (GstTSDemuxClass * klass)
{
GObjectClass *gobject_class;
MpegTSBaseClass *ts_class;
gobject_class = G_OBJECT_CLASS (klass);
gobject_class->set_property = gst_ts_demux_set_property;
gobject_class->get_property = gst_ts_demux_get_property;
gobject_class->finalize = gst_ts_demux_finalize;
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,
-1, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_EMIT_STATS,
g_param_spec_boolean ("emit-stats", "Emit statistics",
"Emit messages for every pcr/opcr/pts/dts", FALSE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
ts_class = GST_MPEGTS_BASE_CLASS (klass);
ts_class->reset = GST_DEBUG_FUNCPTR (gst_ts_demux_reset);
ts_class->push = GST_DEBUG_FUNCPTR (gst_ts_demux_push);
ts_class->push_event = GST_DEBUG_FUNCPTR (push_event);
ts_class->program_started = GST_DEBUG_FUNCPTR (gst_ts_demux_program_started);
ts_class->stream_added = gst_ts_demux_stream_added;
ts_class->stream_removed = gst_ts_demux_stream_removed;
ts_class->find_timestamps = GST_DEBUG_FUNCPTR (find_timestamps);
ts_class->seek = GST_DEBUG_FUNCPTR (gst_ts_demux_do_seek);
ts_class->flush = GST_DEBUG_FUNCPTR (gst_ts_demux_flush);
}
static void
gst_ts_demux_init (GstTSDemux * demux, GstTSDemuxClass * klass)
{
demux->need_newsegment = TRUE;
demux->program_number = -1;
demux->duration = GST_CLOCK_TIME_NONE;
GST_MPEGTS_BASE (demux)->stream_size = sizeof (TSDemuxStream);
gst_segment_init (&demux->segment, GST_FORMAT_TIME);
demux->first_pcr = (TSPcrOffset) {
GST_CLOCK_TIME_NONE, 0, 0};
demux->cur_pcr = (TSPcrOffset) {
0};
demux->last_pcr = (TSPcrOffset) {
0};
}
static void
gst_ts_demux_reset (MpegTSBase * base)
{
GstTSDemux *demux = (GstTSDemux *) base;
if (demux->index) {
g_array_free (demux->index, TRUE);
demux->index = NULL;
}
demux->index_size = 0;
demux->need_newsegment = TRUE;
demux->program_number = -1;
demux->duration = GST_CLOCK_TIME_NONE;
gst_segment_init (&demux->segment, GST_FORMAT_TIME);
demux->first_pcr = (TSPcrOffset) {
GST_CLOCK_TIME_NONE, 0, 0};
demux->cur_pcr = (TSPcrOffset) {
0};
demux->last_pcr = (TSPcrOffset) {
0};
}
static void
gst_ts_demux_finalize (GObject * object)
{
if (G_OBJECT_CLASS (parent_class)->finalize)
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gst_ts_demux_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstTSDemux *demux = GST_TS_DEMUX (object);
switch (prop_id) {
case PROP_PROGRAM_NUMBER:
/* FIXME: do something if program is switched as opposed to set at
* beginning */
demux->program_number = g_value_get_int (value);
break;
case PROP_EMIT_STATS:
demux->emit_statistics = g_value_get_boolean (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
}
}
static void
gst_ts_demux_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstTSDemux *demux = GST_TS_DEMUX (object);
switch (prop_id) {
case PROP_PROGRAM_NUMBER:
g_value_set_int (value, demux->program_number);
break;
case PROP_EMIT_STATS:
g_value_set_boolean (value, demux->emit_statistics);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
}
}
static const GstQueryType *
gst_ts_demux_srcpad_query_types (GstPad * pad)
{
static const GstQueryType query_types[] = {
GST_QUERY_DURATION,
GST_QUERY_SEEKING,
0
};
return query_types;
}
static gboolean
gst_ts_demux_srcpad_query (GstPad * pad, GstQuery * query)
{
gboolean res = TRUE;
GstFormat format;
GstTSDemux *demux;
MpegTSBase *base;
demux = GST_TS_DEMUX (gst_pad_get_parent (pad));
base = GST_MPEGTS_BASE (demux);
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_DURATION:
GST_DEBUG ("query duration");
gst_query_parse_duration (query, &format, NULL);
if (format == GST_FORMAT_TIME) {
if (!gst_pad_peer_query (base->sinkpad, query))
gst_query_set_duration (query, GST_FORMAT_TIME,
demux->segment.duration);
} else {
GST_DEBUG_OBJECT (demux, "only query duration on TIME is supported");
res = FALSE;
}
break;
case GST_QUERY_SEEKING:
GST_DEBUG ("query seeking");
gst_query_parse_seeking (query, &format, NULL, NULL, NULL);
if (format == GST_FORMAT_TIME) {
gboolean seekable = FALSE;
if (gst_pad_peer_query (base->sinkpad, query))
gst_query_parse_seeking (query, NULL, &seekable, NULL, NULL);
/* If upstream is not seekable in TIME format we use
* our own values here */
if (!seekable)
gst_query_set_seeking (query, GST_FORMAT_TIME,
demux->parent.mode != BASE_MODE_PUSHING, 0,
demux->segment.duration);
} else {
GST_DEBUG_OBJECT (demux, "only TIME is supported for query seeking");
res = FALSE;
}
break;
default:
res = gst_pad_query_default (pad, query);
}
gst_object_unref (demux);
return res;
}
static inline GstClockTime
calculate_gsttime (TSPcrOffset * start, guint64 pcr)
{
GstClockTime time = start->gsttime;
if (start->pcr > pcr)
time += PCRTIME_TO_GSTTIME (PCR_MAX_VALUE - start->pcr) +
PCRTIME_TO_GSTTIME (pcr);
else
time += PCRTIME_TO_GSTTIME (pcr - start->pcr);
return time;
}
static GstFlowReturn
gst_ts_demux_parse_pes_header_pts (GstTSDemux * demux,
MpegTSPacketizerPacket * packet, guint64 * time)
{
PESHeader header;
gint offset = 0;
if (mpegts_parse_pes_header (packet->payload,
packet->data_end - packet->payload, &header, &offset))
return GST_FLOW_ERROR;
*time = header.PTS;
return GST_FLOW_OK;
}
/* performs a accurate/key_unit seek */
static GstFlowReturn
gst_ts_demux_perform_auxiliary_seek (MpegTSBase * base, GstClockTime seektime,
TSPcrOffset * pcroffset, gint64 length, gint16 pid, GstSeekFlags flags,
payload_parse_keyframe auxiliary_seek_fn)
{
GstTSDemux *demux = (GstTSDemux *) base;
GstFlowReturn res = GST_FLOW_ERROR;
gboolean done = FALSE;
gboolean found_keyframe = FALSE, found_accurate = FALSE, need_more = TRUE;
GstBuffer *buf;
MpegTSPacketizerPacket packet;
MpegTSPacketizerPacketReturn pret;
gint64 offset = pcroffset->offset;
gint64 scan_offset = MIN (length, 50 * MPEGTS_MAX_PACKETSIZE);
guint32 state = 0xffffffff;
TSPcrOffset key_pos = { 0 };
GST_DEBUG ("auxiliary seek for %" GST_TIME_FORMAT " from offset: %"
G_GINT64_FORMAT " in %" G_GINT64_FORMAT " bytes for PID: %d "
"%s %s", GST_TIME_ARGS (seektime), pcroffset->offset, length, pid,
(flags & GST_SEEK_FLAG_ACCURATE) ? "accurate" : "",
(flags & GST_SEEK_FLAG_KEY_UNIT) ? "key_unit" : "");
mpegts_packetizer_flush (base->packetizer);
if (base->packetizer->packet_size == MPEGTS_M2TS_PACKETSIZE)
offset -= 4;
while (!done && scan_offset <= length) {
res =
gst_pad_pull_range (base->sinkpad, offset + scan_offset,
50 * MPEGTS_MAX_PACKETSIZE, &buf);
if (res != GST_FLOW_OK)
goto beach;
mpegts_packetizer_push (base->packetizer, buf);
while ((!done)
&& ((pret =
mpegts_packetizer_next_packet (base->packetizer,
&packet)) != PACKET_NEED_MORE)) {
if (G_UNLIKELY (pret == PACKET_BAD))
/* bad header, skip the packet */
goto next;
if (packet.payload_unit_start_indicator)
GST_DEBUG ("found packet for PID: %d with pcr: %" GST_TIME_FORMAT
" at offset: %" G_GINT64_FORMAT, packet.pid,
GST_TIME_ARGS (packet.pcr), packet.offset);
if (packet.payload != NULL && packet.pid == pid) {
if (packet.payload_unit_start_indicator) {
guint64 pts = 0;
GstFlowReturn ok =
gst_ts_demux_parse_pes_header_pts (demux, &packet, &pts);
if (ok == GST_FLOW_OK) {
GstClockTime time = calculate_gsttime (pcroffset, pts * 300);
GST_DEBUG ("packet has PTS: %" GST_TIME_FORMAT,
GST_TIME_ARGS (time));
if (time <= seektime) {
pcroffset->gsttime = time;
pcroffset->pcr = packet.pcr;
pcroffset->offset = packet.offset;
} else
found_accurate = TRUE;
} else
goto next;
/* reset state for new packet */
state = 0xffffffff;
need_more = TRUE;
}
if (auxiliary_seek_fn) {
if (need_more) {
if (auxiliary_seek_fn (&state, &packet, &need_more)) {
found_keyframe = TRUE;
key_pos = *pcroffset;
GST_DEBUG ("found keyframe: time: %" GST_TIME_FORMAT " pcr: %"
GST_TIME_FORMAT " offset %" G_GINT64_FORMAT,
GST_TIME_ARGS (pcroffset->gsttime),
GST_TIME_ARGS (pcroffset->pcr), pcroffset->offset);
}
}
} else {
/* if we don't have a payload parsing function
* every frame is a keyframe */
found_keyframe = TRUE;
}
}
if (flags & GST_SEEK_FLAG_ACCURATE)
done = found_accurate && found_keyframe;
else
done = found_keyframe;
if (done)
*pcroffset = key_pos;
next:
mpegts_packetizer_clear_packet (base->packetizer, &packet);
}
scan_offset += 50 * MPEGTS_MAX_PACKETSIZE;
}
beach:
if (done)
res = GST_FLOW_OK;
else if (GST_FLOW_OK == res)
res = GST_FLOW_CUSTOM_ERROR_1;
mpegts_packetizer_flush (base->packetizer);
return res;
}
static gint
TSPcrOffset_find (gconstpointer a, gconstpointer b, gpointer user_data)
{
/* GST_INFO ("a: %" GST_TIME_FORMAT " offset: %" G_GINT64_FORMAT, */
/* GST_TIME_ARGS (((TSPcrOffset *) a)->gsttime), ((TSPcrOffset *) a)->offset); */
/* GST_INFO ("b: %" GST_TIME_FORMAT " offset: %" G_GINT64_FORMAT, */
/* GST_TIME_ARGS (((TSPcrOffset *) b)->gsttime), ((TSPcrOffset *) b)->offset); */
if (((TSPcrOffset *) a)->gsttime < ((TSPcrOffset *) b)->gsttime)
return -1;
else if (((TSPcrOffset *) a)->gsttime > ((TSPcrOffset *) b)->gsttime)
return 1;
else
return 0;
}
static GstFlowReturn
gst_ts_demux_perform_seek (MpegTSBase * base, GstSegment * segment, guint16 pid)
{
GstTSDemux *demux = (GstTSDemux *) base;
GstFlowReturn res = GST_FLOW_ERROR;
int max_loop_cnt, loop_cnt = 0;
gint64 seekpos = 0;
gint64 time_diff;
GstClockTime seektime;
TSPcrOffset seekpcroffset, pcr_start, pcr_stop, *tmp;
max_loop_cnt = (segment->flags & GST_SEEK_FLAG_ACCURATE) ? 25 : 10;
seektime =
MAX (0,
segment->last_stop - SEEK_TIMESTAMP_OFFSET) + demux->first_pcr.gsttime;
seekpcroffset.gsttime = seektime;
GST_DEBUG ("seeking to %" GST_TIME_FORMAT, GST_TIME_ARGS (seektime));
gst_ts_demux_flush_streams (demux);
if (G_UNLIKELY (!demux->index)) {
GST_ERROR ("no index");
goto done;
}
/* get the first index entry before the seek position */
tmp = gst_util_array_binary_search (demux->index->data, demux->index_size,
sizeof (*tmp), TSPcrOffset_find, GST_SEARCH_MODE_BEFORE, &seekpcroffset,
NULL);
if (G_UNLIKELY (!tmp)) {
GST_ERROR ("value not found");
goto done;
}
pcr_start = *tmp;
pcr_stop = *(++tmp);
if (G_UNLIKELY (!pcr_stop.offset)) {
GST_ERROR ("invalid entry");
goto done;
}
/* check if the last recorded pcr can be used */
if (pcr_start.offset < demux->cur_pcr.offset
&& demux->cur_pcr.offset < pcr_stop.offset) {
demux->cur_pcr.gsttime = calculate_gsttime (&pcr_start, demux->cur_pcr.pcr);
if (demux->cur_pcr.gsttime < seekpcroffset.gsttime)
pcr_start = demux->cur_pcr;
else
pcr_stop = demux->cur_pcr;
}
GST_DEBUG ("start %" GST_TIME_FORMAT " offset: %" G_GINT64_FORMAT,
GST_TIME_ARGS (pcr_start.gsttime), pcr_start.offset);
GST_DEBUG ("stop %" GST_TIME_FORMAT " offset: %" G_GINT64_FORMAT,
GST_TIME_ARGS (pcr_stop.gsttime), pcr_stop.offset);
time_diff = seektime - pcr_start.gsttime;
seekpcroffset = pcr_start;
GST_DEBUG ("cur %" GST_TIME_FORMAT " offset: %" G_GINT64_FORMAT
" time diff: %" G_GINT64_FORMAT,
GST_TIME_ARGS (demux->cur_pcr.gsttime), demux->cur_pcr.offset, time_diff);
/* seek loop */
while (loop_cnt++ < max_loop_cnt && (time_diff > SEEK_TIMESTAMP_OFFSET >> 1)
&& (pcr_stop.gsttime - pcr_start.gsttime > SEEK_TIMESTAMP_OFFSET)) {
gint64 duration = pcr_stop.gsttime - pcr_start.gsttime;
gint64 size = pcr_stop.offset - pcr_start.offset;
if (loop_cnt & 1)
seekpos = pcr_start.offset + (size >> 1);
else
seekpos =
pcr_start.offset + size * ((double) (seektime -
pcr_start.gsttime) / duration);
/* look a litle bit behind */
seekpos =
MAX (pcr_start.offset + 188, seekpos - 55 * MPEGTS_MAX_PACKETSIZE);
GST_DEBUG ("looking for time: %" GST_TIME_FORMAT " .. %" GST_TIME_FORMAT
" .. %" GST_TIME_FORMAT,
GST_TIME_ARGS (pcr_start.gsttime),
GST_TIME_ARGS (seektime), GST_TIME_ARGS (pcr_stop.gsttime));
GST_DEBUG ("looking in bytes: %" G_GINT64_FORMAT " .. %" G_GINT64_FORMAT
" .. %" G_GINT64_FORMAT, pcr_start.offset, seekpos, pcr_stop.offset);
res =
find_pcr_packet (&demux->parent, seekpos, 4000 * MPEGTS_MAX_PACKETSIZE,
&seekpcroffset);
if (G_UNLIKELY (res == GST_FLOW_UNEXPECTED)) {
seekpos =
MAX ((gint64) pcr_start.offset,
seekpos - 2000 * MPEGTS_MAX_PACKETSIZE) + 188;
res =
find_pcr_packet (&demux->parent, seekpos,
8000 * MPEGTS_MAX_PACKETSIZE, &seekpcroffset);
}
if (G_UNLIKELY (res != GST_FLOW_OK)) {
GST_WARNING ("seeking failed %s", gst_flow_get_name (res));
goto done;
}
seekpcroffset.gsttime = calculate_gsttime (&pcr_start, seekpcroffset.pcr);
/* validate */
if (G_UNLIKELY ((seekpcroffset.gsttime < pcr_start.gsttime) ||
(seekpcroffset.gsttime > pcr_stop.gsttime))) {
GST_ERROR ("Unexpected timestamp found, seeking failed! %"
GST_TIME_FORMAT, GST_TIME_ARGS (seekpcroffset.gsttime));
res = GST_FLOW_ERROR;
goto done;
}
if (seekpcroffset.gsttime > seektime) {
pcr_stop = seekpcroffset;
} else {
pcr_start = seekpcroffset;
}
time_diff = seektime - pcr_start.gsttime;
GST_DEBUG ("seeking: %" GST_TIME_FORMAT " found: %" GST_TIME_FORMAT
" diff = %" G_GINT64_FORMAT, GST_TIME_ARGS (seektime),
GST_TIME_ARGS (seekpcroffset.gsttime), time_diff);
}
GST_DEBUG ("seeking finished after %d loops", loop_cnt);
/* use correct seek position for the auxiliary search */
seektime += SEEK_TIMESTAMP_OFFSET;
{
payload_parse_keyframe keyframe_seek = NULL;
MpegTSBaseProgram *program = demux->program;
guint64 avg_bitrate, length;
if (program->streams[pid]) {
switch (program->streams[pid]->stream_type) {
case ST_VIDEO_MPEG1:
case ST_VIDEO_MPEG2:
keyframe_seek = gst_tsdemux_has_mpeg2_keyframe;
break;
case ST_VIDEO_H264:
keyframe_seek = gst_tsdemux_has_h264_keyframe;
break;
case ST_VIDEO_MPEG4:
case ST_VIDEO_DIRAC:
GST_WARNING ("no payload parser for stream 0x%04x type: 0x%02x", pid,
program->streams[pid]->stream_type);
break;
}
} else
GST_WARNING ("no stream info for PID: 0x%04x", pid);
avg_bitrate =
(pcr_stop.offset -
pcr_start.offset) * 1000 * GST_MSECOND / (pcr_stop.gsttime -
pcr_start.gsttime);
seekpcroffset = pcr_start;
/* search in 2500ms for a keyframe */
length =
MIN (demux->last_pcr.offset - pcr_start.offset,
(avg_bitrate * 25) / 10);
res =
gst_ts_demux_perform_auxiliary_seek (base, seektime, &seekpcroffset,
length, pid, segment->flags, keyframe_seek);
if (res == GST_FLOW_CUSTOM_ERROR_1) {
GST_ERROR ("no keyframe found in %" G_GUINT64_FORMAT
" bytes starting from %" G_GUINT64_FORMAT, length,
seekpcroffset.offset);
res = GST_FLOW_ERROR;
}
if (res != GST_FLOW_OK)
goto done;
}
/* update seektime to the actual timestamp of the found keyframe */
if (segment->flags & GST_SEEK_FLAG_KEY_UNIT)
seektime = seekpcroffset.gsttime;
seektime -= demux->first_pcr.gsttime;
segment->last_stop = seektime;
segment->time = seektime;
/* we stop at the end */
if (segment->stop == -1)
segment->stop = demux->first_pcr.gsttime + segment->duration;
demux->need_newsegment = TRUE;
demux->parent.seek_offset = seekpcroffset.offset;
GST_DEBUG ("seeked to postion:%" GST_TIME_FORMAT, GST_TIME_ARGS (seektime));
res = GST_FLOW_OK;
done:
return res;
}
static GstFlowReturn
gst_ts_demux_do_seek (MpegTSBase * base, GstEvent * event, guint16 pid)
{
GstTSDemux *demux = (GstTSDemux *) base;
GstFlowReturn res = GST_FLOW_ERROR;
gdouble rate;
GstFormat format;
GstSeekFlags flags;
GstSeekType start_type, stop_type;
gint64 start, stop;
GstSegment seeksegment;
gboolean update;
gst_event_parse_seek (event, &rate, &format, &flags, &start_type, &start,
&stop_type, &stop);
if (format != GST_FORMAT_TIME) {
goto done;
}
GST_DEBUG ("seek event, rate: %f start: %" GST_TIME_FORMAT
" stop: %" GST_TIME_FORMAT, rate, GST_TIME_ARGS (start),
GST_TIME_ARGS (stop));
if (flags & (GST_SEEK_FLAG_SEGMENT | GST_SEEK_FLAG_SKIP)) {
GST_WARNING ("seek flags 0x%x are not supported", (int) flags);
goto done;
}
/* copy segment, we need this because we still need the old
* segment when we close the current segment. */
memcpy (&seeksegment, &demux->segment, sizeof (GstSegment));
/* configure the segment with the seek variables */
GST_DEBUG_OBJECT (demux, "configuring seek");
GST_DEBUG ("seeksegment: start: %" GST_TIME_FORMAT " stop: %"
GST_TIME_FORMAT " time: %" GST_TIME_FORMAT " accum: %" GST_TIME_FORMAT
" last_stop: %" GST_TIME_FORMAT " duration: %" GST_TIME_FORMAT,
GST_TIME_ARGS (seeksegment.start), GST_TIME_ARGS (seeksegment.stop),
GST_TIME_ARGS (seeksegment.time), GST_TIME_ARGS (seeksegment.accum),
GST_TIME_ARGS (seeksegment.last_stop),
GST_TIME_ARGS (seeksegment.duration));
gst_segment_set_seek (&seeksegment, rate, format, flags, start_type, start,
stop_type, stop, &update);
GST_DEBUG ("seeksegment: start: %" GST_TIME_FORMAT " stop: %"
GST_TIME_FORMAT " time: %" GST_TIME_FORMAT " accum: %" GST_TIME_FORMAT
" last_stop: %" GST_TIME_FORMAT " duration: %" GST_TIME_FORMAT,
GST_TIME_ARGS (seeksegment.start), GST_TIME_ARGS (seeksegment.stop),
GST_TIME_ARGS (seeksegment.time), GST_TIME_ARGS (seeksegment.accum),
GST_TIME_ARGS (seeksegment.last_stop),
GST_TIME_ARGS (seeksegment.duration));
res = gst_ts_demux_perform_seek (base, &seeksegment, pid);
if (G_UNLIKELY (res != GST_FLOW_OK)) {
GST_WARNING ("seeking failed %s", gst_flow_get_name (res));
goto done;
}
/* commit the new segment */
memcpy (&demux->segment, &seeksegment, sizeof (GstSegment));
if (demux->segment.flags & GST_SEEK_FLAG_SEGMENT) {
gst_element_post_message (GST_ELEMENT_CAST (demux),
gst_message_new_segment_start (GST_OBJECT_CAST (demux),
demux->segment.format, demux->segment.last_stop));
}
done:
return res;
}
static gboolean
gst_ts_demux_srcpad_event (GstPad * pad, GstEvent * event)
{
gboolean res = TRUE;
GstTSDemux *demux = GST_TS_DEMUX (gst_pad_get_parent (pad));
GST_DEBUG_OBJECT (pad, "Got event %s",
gst_event_type_get_name (GST_EVENT_TYPE (event)));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_SEEK:
res = mpegts_base_handle_seek_event ((MpegTSBase *) demux, pad, event);
if (!res)
GST_WARNING ("seeking failed");
gst_event_unref (event);
break;
default:
res = gst_pad_event_default (pad, event);
}
gst_object_unref (demux);
return res;
}
static gboolean
push_event (MpegTSBase * base, GstEvent * event)
{
GstTSDemux *demux = (GstTSDemux *) base;
GList *tmp;
if (G_UNLIKELY (demux->program == NULL))
return FALSE;
for (tmp = demux->program->stream_list; tmp; tmp = tmp->next) {
TSDemuxStream *stream = (TSDemuxStream *) tmp->data;
if (stream->pad) {
gst_event_ref (event);
gst_pad_push_event (stream->pad, event);
}
}
return TRUE;
}
static GstFlowReturn
tsdemux_combine_flows (GstTSDemux * demux, TSDemuxStream * stream,
GstFlowReturn ret)
{
GList *tmp;
/* Store the value */
stream->flow_return = ret;
/* 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 (tmp = demux->program->stream_list; tmp; tmp = tmp->next) {
stream = (TSDemuxStream *) tmp->data;
if (stream->pad) {
ret = stream->flow_return;
/* some other return value (must be SUCCESS but we can return
* other values as well) */
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 GstPad *
create_pad_for_stream (MpegTSBase * base, MpegTSBaseStream * bstream,
MpegTSBaseProgram * program)
{
TSDemuxStream *stream = (TSDemuxStream *) bstream;
gchar *name = NULL;
GstCaps *caps = NULL;
GstPadTemplate *template = NULL;
guint8 *desc = NULL;
GstPad *pad = NULL;
GST_LOG ("Attempting to create pad for stream 0x%04x with stream_type %d",
bstream->pid, bstream->stream_type);
switch (bstream->stream_type) {
case ST_VIDEO_MPEG1:
case ST_VIDEO_MPEG2:
GST_LOG ("mpeg video");
template = gst_static_pad_template_get (&video_template);
name = g_strdup_printf ("video_%04x", bstream->pid);
caps = gst_caps_new_simple ("video/mpeg",
"mpegversion", G_TYPE_INT,
bstream->stream_type == ST_VIDEO_MPEG1 ? 1 : 2, "systemstream",
G_TYPE_BOOLEAN, FALSE, NULL);
break;
case ST_AUDIO_MPEG1:
case ST_AUDIO_MPEG2:
GST_LOG ("mpeg audio");
template = gst_static_pad_template_get (&audio_template);
name = g_strdup_printf ("audio_%04x", bstream->pid);
caps =
gst_caps_new_simple ("audio/mpeg", "mpegversion", G_TYPE_INT, 1,
NULL);
break;
case ST_PRIVATE_DATA:
GST_LOG ("private data");
desc =
mpegts_get_descriptor_from_stream ((MpegTSBaseStream *) stream,
DESC_DVB_AC3);
if (desc) {
GST_LOG ("ac3 audio");
template = gst_static_pad_template_get (&audio_template);
name = g_strdup_printf ("audio_%04x", bstream->pid);
caps = gst_caps_new_simple ("audio/x-ac3", NULL);
g_free (desc);
break;
}
desc =
mpegts_get_descriptor_from_stream ((MpegTSBaseStream *) stream,
DESC_DVB_ENHANCED_AC3);
if (desc) {
GST_LOG ("ac3 audio");
template = gst_static_pad_template_get (&audio_template);
name = g_strdup_printf ("audio_%04x", bstream->pid);
caps = gst_caps_new_simple ("audio/x-eac3", NULL);
g_free (desc);
break;
}
desc =
mpegts_get_descriptor_from_stream ((MpegTSBaseStream *) stream,
DESC_DVB_TELETEXT);
if (desc) {
GST_LOG ("teletext");
template = gst_static_pad_template_get (&private_template);
name = g_strdup_printf ("private_%04x", bstream->pid);
caps = gst_caps_new_simple ("private/teletext", NULL);
g_free (desc);
break;
}
desc =
mpegts_get_descriptor_from_stream ((MpegTSBaseStream *) stream,
DESC_DVB_SUBTITLING);
if (desc) {
GST_LOG ("subtitling");
template = gst_static_pad_template_get (&private_template);
name = g_strdup_printf ("private_%04x", bstream->pid);
caps = gst_caps_new_simple ("subpicture/x-dvb", NULL);
g_free (desc);
}
/* hack for itv hd (sid 10510, video pid 3401 */
if (program->program_number == 10510 && bstream->pid == 3401) {
template = gst_static_pad_template_get (&video_template);
name = g_strdup_printf ("video_%04x", bstream->pid);
caps = gst_caps_new_simple ("video/x-h264",
"stream-format", G_TYPE_STRING, "byte-stream",
"alignment", G_TYPE_STRING, "nal", NULL);
}
break;
case ST_HDV_AUX_V:
/* We don't expose those streams since they're only helper streams */
/* template = gst_static_pad_template_get (&private_template); */
/* name = g_strdup_printf ("private_%04x", bstream->pid); */
/* caps = gst_caps_new_simple ("hdv/aux-v", NULL); */
break;
case ST_HDV_AUX_A:
/* We don't expose those streams since they're only helper streams */
/* template = gst_static_pad_template_get (&private_template); */
/* name = g_strdup_printf ("private_%04x", bstream->pid); */
/* caps = gst_caps_new_simple ("hdv/aux-a", NULL); */
break;
case ST_PRIVATE_SECTIONS:
case ST_MHEG:
case ST_DSMCC:
case ST_DSMCC_A:
case ST_DSMCC_B:
case ST_DSMCC_C:
case ST_DSMCC_D:
MPEGTS_BIT_UNSET (base->is_pes, bstream->pid);
break;
case ST_AUDIO_AAC:
template = gst_static_pad_template_get (&audio_template);
name = g_strdup_printf ("audio_%04x", bstream->pid);
caps = gst_caps_new_simple ("audio/mpeg",
"mpegversion", G_TYPE_INT, 4, NULL);
break;
case ST_VIDEO_MPEG4:
template = gst_static_pad_template_get (&video_template);
name = g_strdup_printf ("video_%04x", bstream->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 = gst_static_pad_template_get (&video_template);
name = g_strdup_printf ("video_%04x", bstream->pid);
caps = gst_caps_new_simple ("video/x-h264",
"stream-format", G_TYPE_STRING, "byte-stream",
"alignment", G_TYPE_STRING, "nal", NULL);
break;
case ST_VIDEO_DIRAC:
desc =
mpegts_get_descriptor_from_stream ((MpegTSBaseStream *) stream,
DESC_REGISTRATION);
if (desc) {
if (DESC_LENGTH (desc) >= 4) {
if (DESC_REGISTRATION_format_identifier (desc) == 0x64726163) {
GST_LOG ("dirac");
/* dirac in hex */
template = gst_static_pad_template_get (&video_template);
name = g_strdup_printf ("video_%04x", bstream->pid);
caps = gst_caps_new_simple ("video/x-dirac", NULL);
}
}
g_free (desc);
}
break;
case ST_PRIVATE_EA: /* Try to detect a VC1 stream */
{
desc =
mpegts_get_descriptor_from_stream ((MpegTSBaseStream *) stream,
DESC_REGISTRATION);
if (desc) {
if (DESC_LENGTH (desc) >= 4) {
if (DESC_REGISTRATION_format_identifier (desc) == DRF_ID_VC1) {
GST_WARNING ("0xea private stream type found but no descriptor "
"for VC1. Assuming plain VC1.");
template = gst_static_pad_template_get (&video_template);
name = g_strdup_printf ("video_%04x", bstream->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);
}
}
g_free (desc);
}
break;
}
case ST_BD_AUDIO_AC3:
{
/* REGISTRATION DRF_ID_HDMV */
desc = mpegts_get_descriptor_from_program (program, DESC_REGISTRATION);
if (desc) {
if (DESC_REGISTRATION_format_identifier (desc) == DRF_ID_HDMV) {
template = gst_static_pad_template_get (&audio_template);
name = g_strdup_printf ("audio_%04x", bstream->pid);
caps = gst_caps_new_simple ("audio/x-eac3", NULL);
}
g_free (desc);
}
if (template)
break;
/* DVB_ENHANCED_AC3 */
desc =
mpegts_get_descriptor_from_stream ((MpegTSBaseStream *) stream,
DESC_DVB_ENHANCED_AC3);
if (desc) {
template = gst_static_pad_template_get (&audio_template);
name = g_strdup_printf ("audio_%04x", bstream->pid);
caps = gst_caps_new_simple ("audio/x-eac3", NULL);
g_free (desc);
break;
}
/* DVB_AC3 */
desc =
mpegts_get_descriptor_from_stream ((MpegTSBaseStream *) stream,
DESC_DVB_AC3);
if (!desc)
GST_WARNING ("AC3 stream type found but no corresponding "
"descriptor to differentiate between AC3 and EAC3. "
"Assuming plain AC3.");
else
g_free (desc);
template = gst_static_pad_template_get (&audio_template);
name = g_strdup_printf ("audio_%04x", bstream->pid);
caps = gst_caps_new_simple ("audio/x-ac3", NULL);
break;
}
case ST_BD_AUDIO_EAC3:
template = gst_static_pad_template_get (&audio_template);
name = g_strdup_printf ("audio_%04x", bstream->pid);
caps = gst_caps_new_simple ("audio/x-eac3", NULL);
break;
case ST_PS_AUDIO_DTS:
template = gst_static_pad_template_get (&audio_template);
name = g_strdup_printf ("audio_%04x", bstream->pid);
caps = gst_caps_new_simple ("audio/x-dts", NULL);
break;
case ST_PS_AUDIO_LPCM:
template = gst_static_pad_template_get (&audio_template);
name = g_strdup_printf ("audio_%04x", bstream->pid);
caps = gst_caps_new_simple ("audio/x-lpcm", NULL);
break;
case ST_BD_AUDIO_LPCM:
template = gst_static_pad_template_get (&audio_template);
name = g_strdup_printf ("audio_%04x", bstream->pid);
caps = gst_caps_new_simple ("audio/x-private-ts-lpcm", NULL);
break;
case ST_PS_DVD_SUBPICTURE:
template = gst_static_pad_template_get (&subpicture_template);
name = g_strdup_printf ("subpicture_%04x", bstream->pid);
caps = gst_caps_new_simple ("video/x-dvd-subpicture", NULL);
break;
case ST_BD_PGS_SUBPICTURE:
template = gst_static_pad_template_get (&subpicture_template);
name = g_strdup_printf ("subpicture_%04x", bstream->pid);
caps = gst_caps_new_simple ("subpicture/x-pgs", NULL);
break;
default:
GST_WARNING ("Non-media stream (stream_type:0x%x). Not creating pad",
bstream->stream_type);
break;
}
if (template && name && caps) {
GST_LOG ("stream:%p creating pad with name %s and caps %s", stream, name,
gst_caps_to_string (caps));
pad = gst_pad_new_from_template (template, name);
gst_pad_use_fixed_caps (pad);
gst_pad_set_caps (pad, caps);
gst_pad_set_query_type_function (pad, gst_ts_demux_srcpad_query_types);
gst_pad_set_query_function (pad, gst_ts_demux_srcpad_query);
gst_pad_set_event_function (pad, gst_ts_demux_srcpad_event);
gst_caps_unref (caps);
}
g_free (name);
return pad;
}
static void
gst_ts_demux_stream_added (MpegTSBase * base, MpegTSBaseStream * bstream,
MpegTSBaseProgram * program)
{
TSDemuxStream *stream = (TSDemuxStream *) bstream;
if (!stream->pad) {
/* Create the pad */
if (bstream->stream_type != 0xff)
stream->pad = create_pad_for_stream (base, bstream, program);
stream->pts = GST_CLOCK_TIME_NONE;
}
stream->flow_return = GST_FLOW_OK;
}
static void
gst_ts_demux_stream_removed (MpegTSBase * base, MpegTSBaseStream * bstream)
{
GstTSDemux *demux = GST_TS_DEMUX (base);
TSDemuxStream *stream = (TSDemuxStream *) bstream;
if (stream->pad) {
if (gst_pad_is_active (stream->pad)) {
gboolean need_newsegment = demux->need_newsegment;
/* We must not send the newsegment when flushing the pending data
on the removed stream. We should only push it when the newly added
stream finishes parsing its PTS */
demux->need_newsegment = FALSE;
/* Flush out all data */
GST_DEBUG_OBJECT (stream->pad, "Flushing out pending data");
gst_ts_demux_push_pending_data ((GstTSDemux *) base, stream);
demux->need_newsegment = need_newsegment;
GST_DEBUG_OBJECT (stream->pad, "Pushing out EOS");
gst_pad_push_event (stream->pad, gst_event_new_eos ());
GST_DEBUG_OBJECT (stream->pad, "Deactivating and removing pad");
gst_pad_set_active (stream->pad, FALSE);
gst_element_remove_pad (GST_ELEMENT_CAST (base), stream->pad);
}
stream->pad = NULL;
}
stream->flow_return = GST_FLOW_NOT_LINKED;
}
static void
activate_pad_for_stream (GstTSDemux * tsdemux, TSDemuxStream * stream)
{
if (stream->pad) {
GST_DEBUG_OBJECT (tsdemux, "Activating pad %s:%s for stream %p",
GST_DEBUG_PAD_NAME (stream->pad), stream);
gst_pad_set_active (stream->pad, TRUE);
gst_element_add_pad ((GstElement *) tsdemux, stream->pad);
GST_DEBUG_OBJECT (stream->pad, "done adding pad");
} else
GST_WARNING_OBJECT (tsdemux,
"stream %p (pid 0x%04x, type:0x%03x) has no pad", stream,
((MpegTSBaseStream *) stream)->pid,
((MpegTSBaseStream *) stream)->stream_type);
}
static void
gst_ts_demux_stream_flush (TSDemuxStream * stream)
{
gint i;
stream->pts = GST_CLOCK_TIME_NONE;
for (i = 0; i < stream->nbpending; i++)
gst_buffer_unref (stream->pendingbuffers[i]);
memset (stream->pendingbuffers, 0, TS_MAX_PENDING_BUFFERS);
stream->nbpending = 0;
stream->current = NULL;
}
static void
gst_ts_demux_flush_streams (GstTSDemux * demux)
{
g_list_foreach (demux->program->stream_list,
(GFunc) gst_ts_demux_stream_flush, NULL);
}
static void
gst_ts_demux_program_started (MpegTSBase * base, MpegTSBaseProgram * program)
{
GstTSDemux *demux = GST_TS_DEMUX (base);
GST_DEBUG ("Current program %d, new program %d",
demux->program_number, program->program_number);
if (demux->program_number == -1 ||
demux->program_number == program->program_number) {
GList *tmp;
GST_LOG ("program %d started", program->program_number);
demux->program_number = program->program_number;
demux->program = program;
/* Activate all stream pads, pads will already have been created */
if (base->mode != BASE_MODE_SCANNING) {
for (tmp = program->stream_list; tmp; tmp = tmp->next)
activate_pad_for_stream (demux, (TSDemuxStream *) tmp->data);
gst_element_no_more_pads ((GstElement *) demux);
}
/* Inform scanner we have got our program */
demux->current_program_number = program->program_number;
demux->need_newsegment = TRUE;
}
}
static gboolean
process_section (MpegTSBase * base)
{
GstTSDemux *demux = GST_TS_DEMUX (base);
gboolean based;
gboolean done = FALSE;
MpegTSPacketizerPacket packet;
MpegTSPacketizerPacketReturn pret;
while ((!done)
&& ((pret =
mpegts_packetizer_next_packet (base->packetizer,
&packet)) != PACKET_NEED_MORE)) {
if (G_UNLIKELY (pret == PACKET_BAD))
/* bad header, skip the packet */
goto next;
/* base PSI data */
if (packet.payload != NULL && mpegts_base_is_psi (base, &packet)) {
MpegTSPacketizerSection section;
based =
mpegts_packetizer_push_section (base->packetizer, &packet, &section);
if (G_UNLIKELY (!based))
/* bad section data */
goto next;
if (G_LIKELY (section.complete)) {
/* section complete */
GST_DEBUG ("Section Complete");
based = mpegts_base_handle_psi (base, &section);
gst_buffer_unref (section.buffer);
if (G_UNLIKELY (!based))
/* bad PSI table */
goto next;
}
if (demux->program != NULL) {
GST_DEBUG ("Got Program");
done = TRUE;
}
}
next:
mpegts_packetizer_clear_packet (base->packetizer, &packet);
}
return done;
}
static gboolean
process_pes (MpegTSBase * base, TSPcrOffset * pcroffset)
{
gboolean based, done = FALSE;
MpegTSPacketizerPacket packet;
MpegTSPacketizerPacketReturn pret;
GstTSDemux *demux = GST_TS_DEMUX (base);
guint16 pcr_pid = 0;
while ((!done)
&& ((pret =
mpegts_packetizer_next_packet (base->packetizer,
&packet)) != PACKET_NEED_MORE)) {
if (G_UNLIKELY (pret == PACKET_BAD))
/* bad header, skip the packet */
goto next;
if (demux->program != NULL) {
pcr_pid = demux->program->pcr_pid;
}
/* base PSI data */
if (packet.payload != NULL && mpegts_base_is_psi (base, &packet)) {
MpegTSPacketizerSection section;
based =
mpegts_packetizer_push_section (base->packetizer, &packet, &section);
if (G_UNLIKELY (!based))
/* bad section data */
goto next;
if (G_LIKELY (section.complete)) {
/* section complete */
GST_DEBUG ("Section Complete");
based = mpegts_base_handle_psi (base, &section);
gst_buffer_unref (section.buffer);
if (G_UNLIKELY (!based))
/* bad PSI table */
goto next;
}
}
if (packet.pid == pcr_pid && (packet.adaptation_field_control & 0x02)
&& (packet.afc_flags & MPEGTS_AFC_PCR_FLAG)) {
GST_DEBUG ("PCR[0x%x]: %" G_GINT64_FORMAT, packet.pid, packet.pcr);
pcroffset->pcr = packet.pcr;
pcroffset->offset = packet.offset;
done = TRUE;
}
next:
mpegts_packetizer_clear_packet (base->packetizer, &packet);
}
return done;
}
static GstFlowReturn
find_pcr_packet (MpegTSBase * base, guint64 offset, gint64 length,
TSPcrOffset * pcroffset)
{
GstFlowReturn ret = GST_FLOW_OK;
GstTSDemux *demux = GST_TS_DEMUX (base);
MpegTSBaseProgram *program;
GstBuffer *buf;
gboolean done = FALSE;
guint64 scan_offset = 0;
GST_DEBUG ("Scanning for PCR between:%" G_GINT64_FORMAT
" and the end:%" G_GINT64_FORMAT, offset, offset + length);
/* Get the program */
program = demux->program;
if (G_UNLIKELY (program == NULL))
return GST_FLOW_ERROR;
mpegts_packetizer_flush (base->packetizer);
if (offset >= 4 && base->packetizer->packet_size == MPEGTS_M2TS_PACKETSIZE)
offset -= 4;
while (!done && scan_offset < length) {
ret =
gst_pad_pull_range (base->sinkpad, offset + scan_offset,
50 * MPEGTS_MAX_PACKETSIZE, &buf);
if (ret != GST_FLOW_OK)
goto beach;
mpegts_packetizer_push (base->packetizer, buf);
done = process_pes (base, pcroffset);
scan_offset += 50 * MPEGTS_MAX_PACKETSIZE;
}
if (!done || scan_offset >= length) {
GST_WARNING ("No PCR found!");
ret = GST_FLOW_ERROR;
goto beach;
}
beach:
mpegts_packetizer_flush (base->packetizer);
return ret;
}
static gboolean
verify_timestamps (MpegTSBase * base, TSPcrOffset * first, TSPcrOffset * last)
{
GstTSDemux *demux = GST_TS_DEMUX (base);
guint64 length = 4000 * MPEGTS_MAX_PACKETSIZE;
guint64 offset = PCR_WRAP_SIZE_128KBPS;
demux->index =
g_array_sized_new (TRUE, TRUE, sizeof (*first),
2 + 1 + ((last->offset - first->offset) / PCR_WRAP_SIZE_128KBPS));
first->gsttime = PCRTIME_TO_GSTTIME (first->pcr);
demux->index = g_array_append_val (demux->index, *first);
demux->index_size++;
demux->first_pcr = *first;
demux->index_pcr = *first;
GST_DEBUG ("first time: %" GST_TIME_FORMAT " pcr: %" GST_TIME_FORMAT
" offset: %" G_GINT64_FORMAT
" last pcr: %" GST_TIME_FORMAT " offset: %" G_GINT64_FORMAT,
GST_TIME_ARGS (first->gsttime),
GST_TIME_ARGS (PCRTIME_TO_GSTTIME (first->pcr)), first->offset,
GST_TIME_ARGS (PCRTIME_TO_GSTTIME (last->pcr)), last->offset);
while (offset + length < last->offset) {
TSPcrOffset half;
GstFlowReturn ret;
gint tries = 0;
retry:
ret = find_pcr_packet (base, offset, length, &half);
if (G_UNLIKELY (ret != GST_FLOW_OK)) {
GST_WARNING ("no pcr found, retrying");
if (tries++ < 3) {
offset += length;
length *= 2;
goto retry;
}
return FALSE;
}
half.gsttime = calculate_gsttime (first, half.pcr);
GST_DEBUG ("add half time: %" GST_TIME_FORMAT " pcr: %" GST_TIME_FORMAT
" offset: %" G_GINT64_FORMAT,
GST_TIME_ARGS (half.gsttime),
GST_TIME_ARGS (PCRTIME_TO_GSTTIME (half.pcr)), half.offset);
demux->index = g_array_append_val (demux->index, half);
demux->index_size++;
length = 4000 * MPEGTS_MAX_PACKETSIZE;
offset += PCR_WRAP_SIZE_128KBPS;
*first = half;
}
last->gsttime = calculate_gsttime (first, last->pcr);
GST_DEBUG ("add last time: %" GST_TIME_FORMAT " pcr: %" GST_TIME_FORMAT
" offset: %" G_GINT64_FORMAT,
GST_TIME_ARGS (last->gsttime),
GST_TIME_ARGS (PCRTIME_TO_GSTTIME (last->pcr)), last->offset);
demux->index = g_array_append_val (demux->index, *last);
demux->index_size++;
demux->last_pcr = *last;
return TRUE;
}
static GstFlowReturn
find_timestamps (MpegTSBase * base, guint64 initoff, guint64 * offset)
{
GstFlowReturn ret = GST_FLOW_OK;
GstBuffer *buf;
gboolean done = FALSE;
GstFormat format = GST_FORMAT_BYTES;
gint64 total_bytes;
guint64 scan_offset;
guint i = 0;
TSPcrOffset initial, final;
GstTSDemux *demux = GST_TS_DEMUX (base);
GST_DEBUG ("Scanning for timestamps");
/* Flush what remained from before */
mpegts_packetizer_clear (base->packetizer);
/* Start scanning from know PAT offset */
while (!done) {
ret =
gst_pad_pull_range (base->sinkpad, i * 50 * MPEGTS_MAX_PACKETSIZE,
50 * MPEGTS_MAX_PACKETSIZE, &buf);
if (ret != GST_FLOW_OK)
goto beach;
mpegts_packetizer_push (base->packetizer, buf);
done = process_section (base);
i++;
}
mpegts_packetizer_clear (base->packetizer);
done = FALSE;
i = 1;
*offset = base->seek_offset;
/* Search for the first PCRs */
ret = process_pcr (base, base->first_pat_offset, &initial, 10, TRUE);
if (ret != GST_FLOW_OK && ret != GST_FLOW_UNEXPECTED) {
GST_WARNING ("Problem getting initial PCRs");
goto beach;
}
mpegts_packetizer_clear (base->packetizer);
/* Remove current program so we ensure looking for a PAT when scanning the
* for the final PCR */
gst_structure_free (base->pat);
base->pat = NULL;
mpegts_base_remove_program (base, demux->current_program_number);
demux->program = NULL;
/* Find end position */
if (G_UNLIKELY (!gst_pad_query_peer_duration (base->sinkpad, &format,
&total_bytes) || format != GST_FORMAT_BYTES)) {
GST_WARNING_OBJECT (base, "Couldn't get upstream size in bytes");
ret = GST_FLOW_ERROR;
mpegts_packetizer_clear (base->packetizer);
return ret;
}
GST_DEBUG ("Upstream is %" G_GINT64_FORMAT " bytes", total_bytes);
/* Let's start scanning 4000 packets from the end */
scan_offset = MAX (188, total_bytes - 4000 * MPEGTS_MAX_PACKETSIZE);
GST_DEBUG ("Scanning for last sync point between:%" G_GINT64_FORMAT
" and the end:%" G_GINT64_FORMAT, scan_offset, total_bytes);
while ((!done) && (scan_offset < total_bytes)) {
ret =
gst_pad_pull_range (base->sinkpad,
scan_offset, 50 * MPEGTS_MAX_PACKETSIZE, &buf);
if (ret != GST_FLOW_OK)
goto beach;
mpegts_packetizer_push (base->packetizer, buf);
done = process_section (base);
scan_offset += 50 * MPEGTS_MAX_PACKETSIZE;
}
mpegts_packetizer_clear (base->packetizer);
GST_DEBUG ("Searching PCR");
ret =
process_pcr (base, scan_offset - 50 * MPEGTS_MAX_PACKETSIZE, &final, 10,
FALSE);
if (ret != GST_FLOW_OK) {
GST_DEBUG ("Problem getting last PCRs");
goto beach;
}
verify_timestamps (base, &initial, &final);
gst_segment_set_duration (&demux->segment, GST_FORMAT_TIME,
demux->last_pcr.gsttime - demux->first_pcr.gsttime);
demux->duration = demux->last_pcr.gsttime - demux->first_pcr.gsttime;
GST_DEBUG ("Done, duration:%" GST_TIME_FORMAT,
GST_TIME_ARGS (demux->duration));
beach:
mpegts_packetizer_clear (base->packetizer);
/* Remove current program */
if (base->pat) {
gst_structure_free (base->pat);
base->pat = NULL;
}
mpegts_base_remove_program (base, demux->current_program_number);
demux->program = NULL;
return ret;
}
static GstFlowReturn
process_pcr (MpegTSBase * base, guint64 initoff, TSPcrOffset * pcroffset,
guint numpcr, gboolean isinitial)
{
GstTSDemux *demux = GST_TS_DEMUX (base);
GstFlowReturn ret = GST_FLOW_OK;
MpegTSBaseProgram *program;
GstBuffer *buf;
guint nbpcr, i = 0;
guint32 pcrmask, pcrpattern;
guint64 pcrs[50];
guint64 pcroffs[50];
GstByteReader br;
GST_DEBUG ("initoff:%" G_GUINT64_FORMAT ", numpcr:%d, isinitial:%d",
initoff, numpcr, isinitial);
/* Get the program */
program = demux->program;
if (G_UNLIKELY (program == NULL))
return GST_FLOW_ERROR;
/* First find the first X PCR */
nbpcr = 0;
/* Mask/pattern is PID:PCR_PID, AFC&0x02 */
/* sync_byte (0x47) : 8bits => 0xff
* transport_error_indicator : 1bit ACTIVATE
* payload_unit_start_indicator : 1bit IGNORE
* transport_priority : 1bit IGNORE
* PID : 13bit => 0x9f 0xff
* transport_scrambling_control : 2bit
* adaptation_field_control : 2bit
* continuity_counter : 4bit => 0x30
*/
pcrmask = 0xff9fff20;
pcrpattern = 0x47000020 | ((program->pcr_pid & 0x1fff) << 8);
for (i = 0; (i < 20) && (nbpcr < numpcr); i++) {
guint offset, size;
ret =
gst_pad_pull_range (base->sinkpad,
initoff + i * 500 * base->packetsize, 500 * base->packetsize, &buf);
if (G_UNLIKELY (ret != GST_FLOW_OK))
goto beach;
gst_byte_reader_init_from_buffer (&br, buf);
offset = 0;
size = GST_BUFFER_SIZE (buf);
resync:
offset = gst_byte_reader_masked_scan_uint32 (&br, 0xff000000, 0x47000000,
0, base->packetsize);
if (offset == -1)
continue;
while ((nbpcr < numpcr) && (size >= base->packetsize)) {
guint32 header = GST_READ_UINT32_BE (br.data + offset);
if ((header >> 24) != 0x47)
goto resync;
if ((header & pcrmask) != pcrpattern) {
/* Move offset forward by 1 packet */
size -= base->packetsize;
offset += base->packetsize;
continue;
}
/* Potential PCR */
/* GST_DEBUG ("offset %" G_GUINT64_FORMAT, GST_BUFFER_OFFSET (buf) + offset);
GST_MEMDUMP ("something", GST_BUFFER_DATA (buf) + offset, 16);*/
if ((*(br.data + offset + 5)) & MPEGTS_AFC_PCR_FLAG) {
guint64 lpcr = mpegts_packetizer_compute_pcr (br.data + offset + 6);
GST_INFO ("Found PCR %" G_GUINT64_FORMAT " %" GST_TIME_FORMAT
" at offset %" G_GUINT64_FORMAT, lpcr,
GST_TIME_ARGS (PCRTIME_TO_GSTTIME (lpcr)),
GST_BUFFER_OFFSET (buf) + offset);
pcrs[nbpcr] = lpcr;
pcroffs[nbpcr] = GST_BUFFER_OFFSET (buf) + offset;
/* Safeguard against bogus PCR (by detecting if it's the same as the
* previous one or wheter the difference with the previous one is
* greater than 10mins */
if (nbpcr > 1) {
if (pcrs[nbpcr] == pcrs[nbpcr - 1]) {
GST_WARNING ("Found same PCR at different offset");
} else if (pcrs[nbpcr] < pcrs[nbpcr - 1]) {
GST_WARNING ("Found PCR wraparound");
nbpcr += 1;
} else if ((pcrs[nbpcr] - pcrs[nbpcr - 1]) >
(guint64) 10 * 60 * 27000000) {
GST_WARNING ("PCR differs with previous PCR by more than 10 mins");
} else
nbpcr += 1;
} else
nbpcr += 1;
}
/* Move offset forward by 1 packet */
size -= base->packetsize;
offset += base->packetsize;
}
}
beach:
GST_DEBUG ("Found %d PCR", nbpcr);
if (nbpcr) {
if (isinitial) {
pcroffset->pcr = pcrs[0];
pcroffset->offset = pcroffs[0];
} else {
pcroffset->pcr = pcrs[nbpcr - 1];
pcroffset->offset = pcroffs[nbpcr - 1];
}
if (nbpcr > 1) {
GST_DEBUG ("pcrdiff:%" GST_TIME_FORMAT " offsetdiff %" G_GUINT64_FORMAT,
GST_TIME_ARGS (PCRTIME_TO_GSTTIME (pcrs[nbpcr - 1] - pcrs[0])),
pcroffs[nbpcr - 1] - pcroffs[0]);
GST_DEBUG ("Estimated bitrate %" G_GUINT64_FORMAT,
gst_util_uint64_scale (GST_SECOND, pcroffs[nbpcr - 1] - pcroffs[0],
PCRTIME_TO_GSTTIME (pcrs[nbpcr - 1] - pcrs[0])));
GST_DEBUG ("Average PCR interval %" G_GUINT64_FORMAT,
(pcroffs[nbpcr - 1] - pcroffs[0]) / nbpcr);
}
}
/* Swallow any errors if it happened during the end scanning */
if (!isinitial)
ret = GST_FLOW_OK;
return ret;
}
static inline void
gst_ts_demux_record_pcr (GstTSDemux * demux, TSDemuxStream * stream,
guint64 pcr, guint64 offset)
{
MpegTSBaseStream *bs = (MpegTSBaseStream *) stream;
GST_LOG ("pid 0x%04x pcr:%" GST_TIME_FORMAT " at offset %"
G_GUINT64_FORMAT, bs->pid,
GST_TIME_ARGS (PCRTIME_TO_GSTTIME (pcr)), offset);
if (G_LIKELY (bs->pid == demux->program->pcr_pid)) {
demux->cur_pcr.gsttime = GST_CLOCK_TIME_NONE;
demux->cur_pcr.offset = offset;
demux->cur_pcr.pcr = pcr;
/* set first_pcr in push mode */
if (G_UNLIKELY (!demux->first_pcr.gsttime == GST_CLOCK_TIME_NONE)) {
demux->first_pcr.gsttime = PCRTIME_TO_GSTTIME (pcr);
demux->first_pcr.offset = offset;
demux->first_pcr.pcr = pcr;
}
}
if (G_UNLIKELY (demux->emit_statistics)) {
GstStructure *st;
st = gst_structure_id_empty_new (QUARK_TSDEMUX);
gst_structure_id_set (st,
QUARK_PID, G_TYPE_UINT, bs->pid,
QUARK_OFFSET, G_TYPE_UINT64, offset, QUARK_PCR, G_TYPE_UINT64, pcr,
NULL);
gst_element_post_message (GST_ELEMENT_CAST (demux),
gst_message_new_element (GST_OBJECT (demux), st));
}
}
static inline void
gst_ts_demux_record_opcr (GstTSDemux * demux, TSDemuxStream * stream,
guint64 opcr, guint64 offset)
{
MpegTSBaseStream *bs = (MpegTSBaseStream *) stream;
GST_LOG ("pid 0x%04x opcr:%" GST_TIME_FORMAT " at offset %"
G_GUINT64_FORMAT, bs->pid,
GST_TIME_ARGS (PCRTIME_TO_GSTTIME (opcr)), offset);
if (G_UNLIKELY (demux->emit_statistics)) {
GstStructure *st;
st = gst_structure_id_empty_new (QUARK_TSDEMUX);
gst_structure_id_set (st,
QUARK_PID, G_TYPE_UINT, bs->pid,
QUARK_OFFSET, G_TYPE_UINT64, offset,
QUARK_OPCR, G_TYPE_UINT64, opcr, NULL);
gst_element_post_message (GST_ELEMENT_CAST (demux),
gst_message_new_element (GST_OBJECT (demux), st));
}
}
static inline void
gst_ts_demux_record_pts (GstTSDemux * demux, TSDemuxStream * stream,
guint64 pts, guint64 offset)
{
MpegTSBaseStream *bs = (MpegTSBaseStream *) stream;
GST_LOG ("pid 0x%04x pts:%" GST_TIME_FORMAT " at offset %"
G_GUINT64_FORMAT, bs->pid,
GST_TIME_ARGS (MPEGTIME_TO_GSTTIME (pts)), offset);
if (G_UNLIKELY (demux->emit_statistics)) {
GstStructure *st;
st = gst_structure_id_empty_new (QUARK_TSDEMUX);
gst_structure_id_set (st,
QUARK_PID, G_TYPE_UINT, bs->pid,
QUARK_OFFSET, G_TYPE_UINT64, offset, QUARK_PTS, G_TYPE_UINT64, pts,
NULL);
gst_element_post_message (GST_ELEMENT_CAST (demux),
gst_message_new_element (GST_OBJECT (demux), st));
}
}
static inline void
gst_ts_demux_record_dts (GstTSDemux * demux, TSDemuxStream * stream,
guint64 dts, guint64 offset)
{
MpegTSBaseStream *bs = (MpegTSBaseStream *) stream;
GST_LOG ("pid 0x%04x dts:%" GST_TIME_FORMAT " at offset %"
G_GUINT64_FORMAT, bs->pid,
GST_TIME_ARGS (MPEGTIME_TO_GSTTIME (dts)), offset);
if (G_UNLIKELY (demux->emit_statistics)) {
GstStructure *st;
st = gst_structure_id_empty_new (QUARK_TSDEMUX);
gst_structure_id_set (st,
QUARK_PID, G_TYPE_UINT, bs->pid,
QUARK_OFFSET, G_TYPE_UINT64, offset, QUARK_DTS, G_TYPE_UINT64, dts,
NULL);
gst_element_post_message (GST_ELEMENT_CAST (demux),
gst_message_new_element (GST_OBJECT (demux), st));
}
}
static inline GstClockTime
calc_gsttime_from_pts (TSPcrOffset * start, guint64 pts)
{
GstClockTime time = start->gsttime - PCRTIME_TO_GSTTIME (start->pcr);
if (start->pcr > pts * 300)
time += PCRTIME_TO_GSTTIME (PCR_MAX_VALUE) + MPEGTIME_TO_GSTTIME (pts);
else
time += MPEGTIME_TO_GSTTIME (pts);
return time;
}
#if 0
static gint
TSPcrOffset_find_offset (gconstpointer a, gconstpointer b, gpointer user_data)
{
if (((TSPcrOffset *) a)->offset < ((TSPcrOffset *) b)->offset)
return -1;
else if (((TSPcrOffset *) a)->offset > ((TSPcrOffset *) b)->offset)
return 1;
else
return 0;
}
#endif
static GstFlowReturn
gst_ts_demux_parse_pes_header (GstTSDemux * demux, TSDemuxStream * stream)
{
MpegTSBase *base = (MpegTSBase *) demux;
PESHeader header;
GstFlowReturn res = GST_FLOW_OK;
gint offset = 0;
guint8 *data;
guint32 length;
guint64 bufferoffset;
GstClockTime time;
PESParsingResult parseres;
data = GST_BUFFER_DATA (stream->pendingbuffers[0]);
length = GST_BUFFER_SIZE (stream->pendingbuffers[0]);
bufferoffset = GST_BUFFER_OFFSET (stream->pendingbuffers[0]);
GST_MEMDUMP ("Header buffer", data, MIN (length, 32));
parseres = mpegts_parse_pes_header (data, length, &header, &offset);
if (G_UNLIKELY (parseres == PES_PARSING_NEED_MORE))
goto discont;
if (G_UNLIKELY (parseres == PES_PARSING_BAD)) {
GST_WARNING ("Error parsing PES header. pid: 0x%x stream_type: 0x%x",
stream->stream.pid, stream->stream.stream_type);
goto discont;
}
if (header.PTS != -1) {
gst_ts_demux_record_pts (demux, stream, header.PTS, bufferoffset);
#if 0
/* WTH IS THIS ??? */
if (demux->index_pcr.offset + PCR_WRAP_SIZE_128KBPS + 1000 * 128 < offset
|| (demux->index_pcr.offset > offset)) {
/* find next entry */
TSPcrOffset *next;
demux->index_pcr.offset = offset;
next = gst_util_array_binary_search (demux->index->data,
demux->index_size, sizeof (*next), TSPcrOffset_find_offset,
GST_SEARCH_MODE_BEFORE, &demux->index_pcr, NULL);
if (next) {
GST_INFO ("new index_pcr %" GST_TIME_FORMAT " offset: %"
G_GINT64_FORMAT, GST_TIME_ARGS (next->gsttime), next->offset);
demux->index_pcr = *next;
}
}
time = calc_gsttime_from_pts (&demux->index_pcr, pts);
#endif
stream->pts = time = MPEGTIME_TO_GSTTIME (header.PTS);
GST_DEBUG_OBJECT (base, "stream PTS %" GST_TIME_FORMAT,
GST_TIME_ARGS (stream->pts));
/* safe default if insufficient upstream info */
if (G_UNLIKELY (!GST_CLOCK_TIME_IS_VALID (base->in_gap) &&
GST_CLOCK_TIME_IS_VALID (base->first_buf_ts) &&
base->mode == BASE_MODE_PUSHING &&
base->segment.format == GST_FORMAT_TIME)) {
/* Find the earliest current PTS we're going to push */
GstClockTime firstpts = GST_CLOCK_TIME_NONE;
GList *tmp;
for (tmp = demux->program->stream_list; tmp; tmp = tmp->next) {
TSDemuxStream *pstream = (TSDemuxStream *) tmp->data;
if (!GST_CLOCK_TIME_IS_VALID (firstpts) || pstream->pts < firstpts)
firstpts = pstream->pts;
}
base->in_gap = base->first_buf_ts - firstpts;
GST_DEBUG_OBJECT (base, "upstream segment start %" GST_TIME_FORMAT
", first buffer timestamp: %" GST_TIME_FORMAT
", first PTS: %" GST_TIME_FORMAT
", interpolation gap: %" GST_TIME_FORMAT,
GST_TIME_ARGS (base->segment.start),
GST_TIME_ARGS (base->first_buf_ts), GST_TIME_ARGS (firstpts),
GST_TIME_ARGS (base->in_gap));
}
if (!GST_CLOCK_TIME_IS_VALID (base->in_gap))
base->in_gap = 0;
GST_BUFFER_TIMESTAMP (stream->pendingbuffers[0]) = time + base->in_gap;
}
if (header.DTS != -1)
gst_ts_demux_record_dts (demux, stream, header.DTS, bufferoffset);
/* Remove PES headers */
GST_DEBUG ("Moving data forward by %d bytes", header.header_size);
GST_BUFFER_DATA (stream->pendingbuffers[0]) += header.header_size;
GST_BUFFER_SIZE (stream->pendingbuffers[0]) -= header.header_size;
/* FIXME : responsible for switching to PENDING_PACKET_BUFFER and
* creating the bufferlist */
if (1) {
/* Append to the buffer list */
if (G_UNLIKELY (stream->current == NULL)) {
guint8 i;
/* Create a new bufferlist */
stream->current = gst_buffer_list_new ();
stream->currentit = gst_buffer_list_iterate (stream->current);
stream->currentlist = NULL;
gst_buffer_list_iterator_add_group (stream->currentit);
/* Push pending buffers into the list */
for (i = stream->nbpending; i; i--)
stream->currentlist =
g_list_prepend (stream->currentlist, stream->pendingbuffers[i - 1]);
memset (stream->pendingbuffers, 0, TS_MAX_PENDING_BUFFERS);
stream->nbpending = 0;
}
stream->state = PENDING_PACKET_BUFFER;
}
return res;
discont:
stream->state = PENDING_PACKET_DISCONT;
return res;
}
/* ONLY CALL THIS:
* * WITH packet->payload != NULL
* * WITH pending/current flushed out if beginning of new PES packet
*/
static inline void
gst_ts_demux_queue_data (GstTSDemux * demux, TSDemuxStream * stream,
MpegTSPacketizerPacket * packet)
{
GstBuffer *buf;
GST_DEBUG ("state:%d", stream->state);
buf = packet->buffer;
/* HACK : Instead of creating a new buffer, we just modify the data/size
* of the buffer to point to the payload */
GST_BUFFER_DATA (buf) = packet->payload;
GST_BUFFER_SIZE (buf) = packet->data_end - packet->payload;
if (stream->state == PENDING_PACKET_EMPTY) {
if (G_UNLIKELY (!packet->payload_unit_start_indicator)) {
stream->state = PENDING_PACKET_DISCONT;
GST_WARNING ("Didn't get the first packet of this PES");
} else {
GST_LOG ("EMPTY=>HEADER");
stream->state = PENDING_PACKET_HEADER;
if (stream->pad) {
GST_DEBUG ("Setting pad caps on buffer %p", buf);
gst_buffer_set_caps (buf, GST_PAD_CAPS (stream->pad));
}
}
}
if (stream->state == PENDING_PACKET_HEADER) {
GST_LOG ("HEADER: appending data to array");
/* Append to the array */
stream->pendingbuffers[stream->nbpending++] = buf;
/* parse the header */
gst_ts_demux_parse_pes_header (demux, stream);
} else if (stream->state == PENDING_PACKET_BUFFER) {
GST_LOG ("BUFFER: appending data to bufferlist");
stream->currentlist = g_list_prepend (stream->currentlist, buf);
}
return;
}
static void
calculate_and_push_newsegment (GstTSDemux * demux, TSDemuxStream * stream)
{
MpegTSBase *base = (MpegTSBase *) demux;
GstEvent *newsegmentevent;
gint64 start, stop, position;
GstClockTime firstpts = GST_CLOCK_TIME_NONE;
GList *tmp;
GST_DEBUG ("Creating new newsegment for stream %p", stream);
/* Outgoing newsegment values
* start : The first/start PTS
* stop : The last PTS (or -1)
* position : The stream time corresponding to start
*
* Except for live mode with incoming GST_TIME_FORMAT newsegment where
* it is the same values as that incoming newsegment (and we convert the
* PTS to that remote clock).
*/
for (tmp = demux->program->stream_list; tmp; tmp = tmp->next) {
TSDemuxStream *pstream = (TSDemuxStream *) tmp->data;
if (!GST_CLOCK_TIME_IS_VALID (firstpts) || pstream->pts < firstpts)
firstpts = pstream->pts;
}
if (base->mode == BASE_MODE_PUSHING) {
/* FIXME : We're just ignore the upstream format for the time being */
/* FIXME : We should use base->segment.format and a upstream latency query
* to decide if we need to use live values or not */
GST_DEBUG ("push-based. base Segment start:%" GST_TIME_FORMAT " duration:%"
GST_TIME_FORMAT ", time:%" GST_TIME_FORMAT,
GST_TIME_ARGS (base->segment.start),
GST_TIME_ARGS (base->segment.duration),
GST_TIME_ARGS (base->segment.time));
GST_DEBUG ("push-based. demux Segment start:%" GST_TIME_FORMAT " duration:%"
GST_TIME_FORMAT ", time:%" GST_TIME_FORMAT,
GST_TIME_ARGS (demux->segment.start),
GST_TIME_ARGS (demux->segment.duration),
GST_TIME_ARGS (demux->segment.time));
GST_DEBUG ("stream pts: %" GST_TIME_FORMAT " first pts: %" GST_TIME_FORMAT,
GST_TIME_ARGS (stream->pts), GST_TIME_ARGS (firstpts));
start = base->segment.start;
stop = base->segment.stop;
/* Shift the start depending on our position in the stream */
start += firstpts + base->in_gap - base->first_buf_ts;
position = start;
} else {
/* pull mode */
GST_DEBUG ("pull-based. Segment start:%" GST_TIME_FORMAT " duration:%"
GST_TIME_FORMAT ", time:%" GST_TIME_FORMAT,
GST_TIME_ARGS (demux->segment.start),
GST_TIME_ARGS (demux->segment.duration),
GST_TIME_ARGS (demux->segment.time));
GST_DEBUG ("firstpcr gsttime : %" GST_TIME_FORMAT,
GST_TIME_ARGS (demux->first_pcr.gsttime));
/* FIXME : This is not entirely correct. We should be using the PTS time
* realm and not the PCR one. Doesn't matter *too* much if PTS/PCR values
* aren't too far apart, but still. */
start = demux->first_pcr.gsttime + demux->segment.start;
stop = demux->first_pcr.gsttime + demux->segment.duration;
position = demux->segment.time;
}
GST_DEBUG ("new segment: start: %" GST_TIME_FORMAT " stop: %"
GST_TIME_FORMAT " time: %" GST_TIME_FORMAT, GST_TIME_ARGS (start),
GST_TIME_ARGS (stop), GST_TIME_ARGS (position));
newsegmentevent =
gst_event_new_new_segment (FALSE, 1.0, GST_FORMAT_TIME, start, stop,
position);
push_event ((MpegTSBase *) demux, newsegmentevent);
demux->need_newsegment = FALSE;
}
static GstFlowReturn
gst_ts_demux_push_pending_data (GstTSDemux * demux, TSDemuxStream * stream)
{
GstFlowReturn res = GST_FLOW_OK;
MpegTSBaseStream *bs = (MpegTSBaseStream *) stream;
GST_DEBUG ("stream:%p, pid:0x%04x stream_type:%d state:%d pad:%s:%s",
stream, bs->pid, bs->stream_type, stream->state,
GST_DEBUG_PAD_NAME (stream->pad));
if (G_UNLIKELY (stream->current == NULL)) {
GST_LOG ("stream->current == NULL");
goto beach;
}
if (G_UNLIKELY (stream->state == PENDING_PACKET_EMPTY)) {
GST_LOG ("EMPTY: returning");
goto beach;
}
if (G_UNLIKELY (stream->state != PENDING_PACKET_BUFFER))
goto beach;
if (G_UNLIKELY (stream->pad == NULL)) {
g_list_foreach (stream->currentlist, (GFunc) gst_buffer_unref, NULL);
g_list_free (stream->currentlist);
gst_buffer_list_iterator_free (stream->currentit);
gst_buffer_list_unref (stream->current);
goto beach;
}
if (G_UNLIKELY (demux->need_newsegment))
calculate_and_push_newsegment (demux, stream);
/* We have a confirmed buffer, let's push it out */
GST_LOG ("Putting pending data into GstBufferList");
stream->currentlist = g_list_reverse (stream->currentlist);
gst_buffer_list_iterator_add_list (stream->currentit, stream->currentlist);
gst_buffer_list_iterator_free (stream->currentit);
GST_DEBUG_OBJECT (stream->pad,
"Pushing buffer list with timestamp: %" GST_TIME_FORMAT,
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (gst_buffer_list_get
(stream->current, 0, 0))));
res = gst_pad_push_list (stream->pad, stream->current);
GST_DEBUG_OBJECT (stream->pad, "Returned %s", gst_flow_get_name (res));
res = tsdemux_combine_flows (demux, stream, res);
GST_DEBUG_OBJECT (stream->pad, "combined %s", gst_flow_get_name (res));
beach:
/* Reset everything */
GST_LOG ("Resetting to EMPTY");
stream->state = PENDING_PACKET_EMPTY;
memset (stream->pendingbuffers, 0, TS_MAX_PENDING_BUFFERS);
stream->nbpending = 0;
stream->current = NULL;
return res;
}
static GstFlowReturn
gst_ts_demux_handle_packet (GstTSDemux * demux, TSDemuxStream * stream,
MpegTSPacketizerPacket * packet, MpegTSPacketizerSection * section)
{
GstFlowReturn res = GST_FLOW_OK;
GST_DEBUG ("buffer:%p, data:%p", GST_BUFFER_DATA (packet->buffer),
packet->data);
GST_LOG ("pid 0x%04x pusi:%d, afc:%d, cont:%d, payload:%p",
packet->pid,
packet->payload_unit_start_indicator,
packet->adaptation_field_control,
packet->continuity_counter, packet->payload);
if (section) {
GST_DEBUG ("section complete:%d, buffer size %d",
section->complete, GST_BUFFER_SIZE (section->buffer));
gst_buffer_unref (packet->buffer);
return res;
}
if (G_UNLIKELY (packet->payload_unit_start_indicator))
/* Flush previous data */
res = gst_ts_demux_push_pending_data (demux, stream);
if (packet->adaptation_field_control & 0x2) {
if (packet->afc_flags & MPEGTS_AFC_PCR_FLAG)
gst_ts_demux_record_pcr (demux, stream, packet->pcr,
GST_BUFFER_OFFSET (packet->buffer));
if (packet->afc_flags & MPEGTS_AFC_OPCR_FLAG)
gst_ts_demux_record_opcr (demux, stream, packet->opcr,
GST_BUFFER_OFFSET (packet->buffer));
}
if (packet->payload)
gst_ts_demux_queue_data (demux, stream, packet);
else
gst_buffer_unref (packet->buffer);
return res;
}
static void
gst_ts_demux_flush (MpegTSBase * base)
{
GstTSDemux *demux = GST_TS_DEMUX_CAST (base);
demux->need_newsegment = TRUE;
gst_ts_demux_flush_streams (demux);
}
static GstFlowReturn
gst_ts_demux_push (MpegTSBase * base, MpegTSPacketizerPacket * packet,
MpegTSPacketizerSection * section)
{
GstTSDemux *demux = GST_TS_DEMUX_CAST (base);
TSDemuxStream *stream = NULL;
GstFlowReturn res = GST_FLOW_OK;
if (G_LIKELY (demux->program)) {
stream = (TSDemuxStream *) demux->program->streams[packet->pid];
if (stream) {
res = gst_ts_demux_handle_packet (demux, stream, packet, section);
} else if (packet->buffer)
gst_buffer_unref (packet->buffer);
} else {
if (packet->buffer)
gst_buffer_unref (packet->buffer);
}
return res;
}
gboolean
gst_ts_demux_plugin_init (GstPlugin * plugin)
{
GST_DEBUG_CATEGORY_INIT (ts_demux_debug, "tsdemux", 0,
"MPEG transport stream demuxer");
init_pes_parser ();
return gst_element_register (plugin, "tsdemux",
GST_RANK_SECONDARY, GST_TYPE_TS_DEMUX);
}
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