mirrors/gstreamer
mirrors/gstreamer
1
1
Fork 0
mirror of https://gitlab.freedesktop.org/gstreamer/gstreamer.git synced 2024-12-18 14:26:43 +00:00
Code Issues 1 Projects Releases Wiki Activity
gstreamer/gst/mpegstream/gstmpegdemux.c
Andy Wingo 06989d4c52 a hack to work around intltool's brokenness a current check for mpeg2dec details->klass reorganizations an element br... 
Original commit message from CVS:
* a hack to work around intltool's brokenness
* a current check for mpeg2dec
* details->klass reorganizations
* an element browser that uses details->klass
* separated cdxa parse out from the avi directory
2002-04-20 21:42:51 +00:00

831 lines
25 KiB
C
Raw Blame History

/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
*
* 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.
*/
/*#define GST_DEBUG_ENABLED*/
#include <gstmpegdemux.h>
/* elementfactory information */
static GstElementDetails mpeg_demux_details = {
"MPEG Demuxer",
"Codec/Demuxer",
"Demultiplexes MPEG1 and MPEG2 System Streams",
VERSION,
"Erik Walthinsen <omega@cse.ogi.edu>\n"
"Wim Taymans <wim.taymans@chello.be>",
"(C) 1999",
};
/* MPEG2Demux signals and args */
enum {
/* FILL ME */
LAST_SIGNAL
};
enum {
ARG_0,
ARG_BIT_RATE,
ARG_MPEG2,
/* FILL ME */
};
GST_PAD_TEMPLATE_FACTORY (sink_factory,
"sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_CAPS_NEW (
"mpeg_demux_sink",
"video/mpeg",
"mpegversion", GST_PROPS_INT_RANGE (1, 2),
"systemstream", GST_PROPS_BOOLEAN (TRUE)
)
);
GST_PAD_TEMPLATE_FACTORY (audio_factory,
"audio_%02d",
GST_PAD_SRC,
GST_PAD_SOMETIMES,
GST_CAPS_NEW (
"mpeg_demux_audio",
"audio/mp3",
NULL
)
);
GST_PAD_TEMPLATE_FACTORY (video_mpeg1_factory,
"video_%02d",
GST_PAD_SRC,
GST_PAD_SOMETIMES,
GST_CAPS_NEW (
"mpeg_demux_video_mpeg1",
"video/mpeg",
"mpegversion", GST_PROPS_INT (1),
"systemstream", GST_PROPS_BOOLEAN (FALSE)
)
);
GST_PAD_TEMPLATE_FACTORY (video_mpeg2_factory,
"video_%02d",
GST_PAD_SRC,
GST_PAD_SOMETIMES,
GST_CAPS_NEW (
"mpeg_demux_video_mpeg2",
"video/mpeg",
"mpegversion", GST_PROPS_INT (2),
"systemstream", GST_PROPS_BOOLEAN (FALSE)
)
);
GST_PAD_TEMPLATE_FACTORY (private1_factory,
"private_stream_1_%02d",
GST_PAD_SRC,
GST_PAD_SOMETIMES,
GST_CAPS_NEW (
"mpeg_demux_private1",
"audio/a52",
NULL
)
);
GST_PAD_TEMPLATE_FACTORY (private2_factory,
"private_stream_2",
GST_PAD_SRC,
GST_PAD_SOMETIMES,
GST_CAPS_NEW (
"mpeg_demux_private2",
"unknown/unknown",
NULL
)
);
GST_PAD_TEMPLATE_FACTORY (subtitle_factory,
"subtitle_stream_%d",
GST_PAD_SRC,
GST_PAD_SOMETIMES,
GST_CAPS_NEW (
"mpeg_demux_subtitle",
"video/mpeg",
NULL
)
);
static void gst_mpeg_demux_class_init (GstMPEGDemuxClass *klass);
static void gst_mpeg_demux_init (GstMPEGDemux *mpeg_demux);
static gboolean gst_mpeg_demux_parse_packhead (GstMPEGParse *mpeg_parse, GstBuffer *buffer);
static gboolean gst_mpeg_demux_parse_syshead (GstMPEGParse *mpeg_parse, GstBuffer *buffer);
static gboolean gst_mpeg_demux_parse_packet (GstMPEGParse *mpeg_parse, GstBuffer *buffer);
static gboolean gst_mpeg_demux_parse_pes (GstMPEGParse *mpeg_parse, GstBuffer *buffer);
static void gst_mpeg_demux_send_data (GstMPEGParse *mpeg_parse, GstData *data);
static GstElementStateReturn
gst_mpeg_demux_change_state (GstElement *element);
static GstMPEGParseClass *parent_class = NULL;
/*static guint gst_mpeg_demux_signals[LAST_SIGNAL] = { 0 };*/
GType
mpeg_demux_get_type (void)
{
static GType mpeg_demux_type = 0;
if (!mpeg_demux_type) {
static const GTypeInfo mpeg_demux_info = {
sizeof(GstMPEGDemuxClass),
NULL,
NULL,
(GClassInitFunc)gst_mpeg_demux_class_init,
NULL,
NULL,
sizeof(GstMPEGDemux),
0,
(GInstanceInitFunc)gst_mpeg_demux_init,
};
mpeg_demux_type = g_type_register_static(GST_TYPE_MPEG_PARSE, "GstMPEGDemux", &mpeg_demux_info, 0);
}
return mpeg_demux_type;
}
static void
gst_mpeg_demux_class_init (GstMPEGDemuxClass *klass)
{
GstMPEGParseClass *mpeg_parse_class;
GstElementClass *gstelement_class;
parent_class = g_type_class_ref (GST_TYPE_MPEG_PARSE);
mpeg_parse_class = (GstMPEGParseClass *) klass;
gstelement_class = (GstElementClass *) klass;
gstelement_class->change_state = gst_mpeg_demux_change_state;
mpeg_parse_class->parse_packhead = gst_mpeg_demux_parse_packhead;
mpeg_parse_class->parse_syshead = gst_mpeg_demux_parse_syshead;
mpeg_parse_class->parse_packet = gst_mpeg_demux_parse_packet;
mpeg_parse_class->parse_pes = gst_mpeg_demux_parse_pes;
mpeg_parse_class->send_data = gst_mpeg_demux_send_data;
}
static void
gst_mpeg_demux_init (GstMPEGDemux *mpeg_demux)
{
gint i;
GstMPEGParse *mpeg_parse = GST_MPEG_PARSE (mpeg_demux);
gst_element_remove_pad (GST_ELEMENT (mpeg_parse), mpeg_parse->sinkpad);
mpeg_parse->sinkpad = gst_pad_new_from_template(
GST_PAD_TEMPLATE_GET (sink_factory), "sink");
gst_element_add_pad (GST_ELEMENT (mpeg_parse), mpeg_parse->sinkpad);
gst_element_remove_pad (GST_ELEMENT (mpeg_parse), mpeg_parse->srcpad);
/* i think everything is already zero'd, but oh well*/
for (i=0;i<NUM_PRIVATE_1_PADS;i++) {
mpeg_demux->private_1_pad[i] = NULL;
mpeg_demux->private_1_offset[i] = 0;
}
for (i=0;i<NUM_SUBTITLE_PADS;i++) {
mpeg_demux->subtitle_pad[i] = NULL;
mpeg_demux->subtitle_offset[i] = 0;
}
mpeg_demux->private_2_pad = NULL;
mpeg_demux->private_2_offset = 0;
for (i=0;i<NUM_VIDEO_PADS;i++) {
mpeg_demux->video_pad[i] = NULL;
mpeg_demux->video_offset[i] = 0;
mpeg_demux->video_PTS[i] = 0;
}
for (i=0;i<NUM_AUDIO_PADS;i++) {
mpeg_demux->audio_pad[i] = NULL;
mpeg_demux->audio_offset[i] = 0;
mpeg_demux->audio_PTS[i] = 0;
}
GST_FLAG_SET (mpeg_demux, GST_ELEMENT_EVENT_AWARE);
}
static void
gst_mpeg_demux_send_data (GstMPEGParse *mpeg_parse, GstData *data)
{
if (GST_IS_BUFFER (data)) {
gst_buffer_unref (GST_BUFFER (data));
}
else {
GstEvent *event = GST_EVENT (data);
gst_pad_event_default (mpeg_parse->sinkpad, event);
}
}
static gboolean
gst_mpeg_demux_parse_packhead (GstMPEGParse *mpeg_parse, GstBuffer *buffer)
{
guint8 *buf;
parent_class->parse_packhead (mpeg_parse, buffer);
GST_DEBUG (0, "mpeg_demux: in parse_packhead");
buf = GST_BUFFER_DATA (buffer);
/* do something usefull here */
return TRUE;
}
static gboolean
gst_mpeg_demux_parse_syshead (GstMPEGParse *mpeg_parse, GstBuffer *buffer)
{
GstMPEGDemux *mpeg_demux = GST_MPEG_DEMUX (mpeg_parse);
guint16 header_length;
guchar *buf;
GST_DEBUG (0, "mpeg_demux: in parse_syshead");
buf = GST_BUFFER_DATA (buffer);
buf += 4;
header_length = GUINT16_FROM_BE (*(guint16 *) buf);
GST_DEBUG (0, "mpeg_demux: header_length %d", header_length);
buf += 2;
/* marker:1==1 ! rate_bound:22 | marker:1==1*/
buf += 3;
/* audio_bound:6==1 ! fixed:1 | constrained:1*/
buf += 1;
/* audio_lock:1 | video_lock:1 | marker:1==1 | video_bound:5 */
buf += 1;
/* apacket_rate_restriction:1 | reserved:7==0x7F */
buf += 1;
if (!GST_MPEG_PARSE_IS_MPEG2 (mpeg_demux)) {
gint stream_count = (header_length - 6) / 3;
gint i, j=0;
GST_DEBUG (0, "mpeg_demux::parse_syshead: number of streams=%d ",
stream_count);
for (i = 0; i < stream_count; i++) {
gint stream_num;
guint8 stream_id;
gboolean STD_buffer_bound_scale;
guint16 STD_buffer_size_bound;
guint32 buf_byte_size_bound;
gchar *name = NULL;
GstPad **outpad = NULL;
GstPadTemplate *newtemp = NULL;
stream_id = *buf++;
if (!(stream_id & 0x80)) {
GST_DEBUG (0, "mpeg_demux::parse_syshead: error in system header length");
return FALSE;
}
/* check marker bits */
if ((*buf & 0xC0) != 0xC0) {
GST_DEBUG (0,
"mpeg_demux::parse_syshead: expecting placeholder bit values '11' after stream id\n");
return FALSE;
}
STD_buffer_bound_scale = *buf & 0x20;
STD_buffer_size_bound = (*buf++ & 0x1F) << 8;
STD_buffer_size_bound |= *buf++;
if (STD_buffer_bound_scale == 0) {
buf_byte_size_bound = STD_buffer_size_bound * 128;
}
else {
buf_byte_size_bound = STD_buffer_size_bound * 1024;
}
/* private_stream_1 */
if (stream_id == 0xBD) {
name = NULL;
outpad = NULL;
}
/* private_stream_2 */
else if (stream_id == 0xBF) {
name = g_strdup_printf ("private_stream_2");
stream_num = 0;
outpad = &mpeg_demux->private_2_pad;
newtemp = GST_PAD_TEMPLATE_GET (private2_factory);
}
/* Audio */
else if ((stream_id >= 0xC0) && (stream_id <= 0xDF)) {
name = g_strdup_printf ("audio_%02d", stream_id & 0x1F);
stream_num = stream_id & 0x1F;
outpad = &mpeg_demux->audio_pad[stream_num];
newtemp = GST_PAD_TEMPLATE_GET (audio_factory);
}
/* Video */
else if ((stream_id >= 0xE0) && (stream_id <= 0xEF)) {
name = g_strdup_printf ("video_%02d", stream_id & 0x0F);
stream_num = stream_id & 0x0F;
outpad = &mpeg_demux->video_pad[stream_num];
if (!GST_MPEG_PARSE_IS_MPEG2 (mpeg_demux)) {
newtemp = GST_PAD_TEMPLATE_GET (video_mpeg1_factory);
}
else {
newtemp = GST_PAD_TEMPLATE_GET (video_mpeg2_factory);
}
}
GST_DEBUG (0, "mpeg_demux::parse_syshead: stream ID 0x%02X (%s)", stream_id, name);
GST_DEBUG (0, "mpeg_demux::parse_syshead: STD_buffer_bound_scale %d", STD_buffer_bound_scale);
GST_DEBUG (0, "mpeg_demux::parse_syshead: STD_buffer_size_bound %d or %d bytes",
STD_buffer_size_bound, buf_byte_size_bound);
/* create the pad and add it to self if it does not yet exist
* this should trigger the NEW_PAD signal, which should be caught by
* the app and used to attach to desired streams.
*/
if (outpad && *outpad == NULL) {
*outpad = gst_pad_new_from_template (newtemp, name);
gst_pad_try_set_caps (*outpad, gst_pad_get_pad_template_caps (*outpad));
gst_element_add_pad (GST_ELEMENT (mpeg_demux), (*outpad));
}
else {
/* we won't be needing this. */
if (name)
g_free (name);
}
mpeg_demux->STD_buffer_info[j].stream_id = stream_id;
mpeg_demux->STD_buffer_info[j].STD_buffer_bound_scale =
STD_buffer_bound_scale;
mpeg_demux->STD_buffer_info[j].STD_buffer_size_bound =
STD_buffer_size_bound;
j++;
}
}
return TRUE;
}
static gboolean
gst_mpeg_demux_parse_packet (GstMPEGParse *mpeg_parse, GstBuffer *buffer)
{
GstMPEGDemux *mpeg_demux = GST_MPEG_DEMUX (mpeg_parse);
guint8 id;
guint16 headerlen;
guint16 packet_length;
gboolean STD_buffer_bound_scale;
guint16 STD_buffer_size_bound;
guint64 dts;
guint8 ps_id_code;
gint64 pts = -1;
guint16 datalen;
gulong outoffset = 0; /* wrong XXX FIXME */
GstPad **outpad = NULL;
GstBuffer *outbuf;
guint8 *buf, *basebuf;
GST_DEBUG (0,"mpeg_demux::parse_packet: in parse_packet");
basebuf = buf = GST_BUFFER_DATA (buffer);
id = *(buf+3);
buf += 4;
/* start parsing */
packet_length = GUINT16_FROM_BE (*((guint16 *)buf));
GST_DEBUG (0,"mpeg_demux: got packet_length %d", packet_length);
headerlen = 2;
buf += 2;
/* loop through looping for stuffing bits, STD, PTS, DTS, etc */
do {
guint8 bits = *buf++;
/* stuffing bytes */
switch (bits & 0xC0) {
case 0xC0:
if (bits == 0xff) {
GST_DEBUG (0,"mpeg_demux::parse_packet: have stuffing byte");
} else {
GST_DEBUG (0,"mpeg_demux::parse_packet: expected stuffing byte");
}
headerlen++;
break;
case 0x40:
GST_DEBUG (0,"mpeg_demux::parse_packet: have STD");
STD_buffer_bound_scale = bits & 0x20;
STD_buffer_size_bound = (bits & 0x1F) << 8;
STD_buffer_size_bound |= *buf++;
headerlen += 2;
break;
case 0x00:
switch (bits & 0x30) {
case 0x20:
/* pts:3 ! 1 ! pts:15 ! 1 | pts:15 ! 1 */
pts = (bits & 0x0E) << 29;
pts |= *buf++ << 22;
pts |= (*buf++ & 0xFE) << 14;
pts |= *buf++ << 7;
pts |= (*buf++ & 0xFE) >> 1;
GST_DEBUG (0,"mpeg_demux::parse_packet: PTS = %llu", pts);
headerlen += 5;
goto done;
case 0x30:
/* pts:3 ! 1 ! pts:15 ! 1 | pts:15 ! 1 */
pts = (bits & 0x0E) << 29;
pts |= *buf++ << 22;
pts |= (*buf++ & 0xFE) << 14;
pts |= *buf++ << 7;
pts |= (*buf++ & 0xFE) >> 1;
/* sync:4 ! pts:3 ! 1 ! pts:15 ! 1 | pts:15 ! 1 */
dts = (*buf++ & 0x0E) << 29;
dts |= *buf++ << 22;
dts |= (*buf++ & 0xFE) << 14;
dts |= *buf++ << 7;
dts |= (*buf++ & 0xFE) >> 1;
GST_DEBUG (0,"mpeg_demux::parse_packet: PTS = %llu, DTS = %llu", pts, dts);
headerlen += 10;
goto done;
case 0x00:
GST_DEBUG (0,"mpeg_demux::parse_packet: have no pts/dts");
GST_DEBUG (0,"mpeg_demux::parse_packet: got trailer bits %x", (bits & 0x0f));
if ((bits & 0x0f) != 0xf) {
GST_DEBUG (0,"mpeg_demux::parse_packet: not a valid packet time sequence");
return FALSE;
}
headerlen++;
default:
goto done;
}
default:
goto done;
}
} while (1);
GST_DEBUG (0,"mpeg_demux::parse_packet: done with header loop");
done:
/* calculate the amount of real data in this packet */
datalen = packet_length - headerlen+2;
GST_DEBUG (0,"mpeg_demux::parse_packet: headerlen is %d, datalen is %d",
headerlen,datalen);
/* private_stream_1 */
if (id == 0xBD) {
/* first find the track code */
ps_id_code = *(basebuf + headerlen);
/* make sure it's valid */
if ((ps_id_code >= 0x80) && (ps_id_code <= 0x87)) {
GST_DEBUG (0,"mpeg_demux::parse_packet: 0x%02X: we have a private_stream_1 (AC3) packet, track %d",
id, ps_id_code - 0x80);
outpad = &mpeg_demux->private_1_pad[ps_id_code - 0x80];
/* scrap first 4 bytes (so-called "mystery AC3 tag") */
headerlen += 4;
datalen -= 4;
}
/* private_stream_1 */
} else if (id == 0xBF) {
GST_DEBUG (0,"mpeg_demux::parse_packet: 0x%02X: we have a private_stream_2 packet", id);
outpad = &mpeg_demux->private_2_pad;
/* audio */
} else if ((id >= 0xC0) && (id <= 0xDF)) {
GST_DEBUG (0,"mpeg_demux::parse_packet: 0x%02X: we have an audio packet", id);
outpad = &mpeg_demux->audio_pad[id & 0x1F];
outoffset = mpeg_demux->audio_offset[id & 0x1F];
mpeg_demux->audio_offset[id & 0x1F] += datalen;
/* video */
} else if ((id >= 0xE0) && (id <= 0xEF)) {
GST_DEBUG (0,"mpeg_demux::parse_packet: 0x%02X: we have a video packet", id);
outpad = &mpeg_demux->video_pad[id & 0x0F];
outoffset = mpeg_demux->video_offset[id & 0x1F];
mpeg_demux->video_offset[id & 0x1F] += datalen;
if (pts == -1)
pts = mpeg_demux->video_PTS[id & 0x1F];
else
mpeg_demux->video_PTS[id & 0x1F] = pts;
}
/* if we don't know what it is, bail */
if (outpad == NULL) {
GST_DEBUG (0,"mpeg_demux::parse_packet: unknown packet id 0x%02X !!", id);
/* return total number of bytes */
return FALSE;
}
/* FIXME, this should be done in parse_syshead */
if ((*outpad) == NULL) {
GST_DEBUG (0,"mpeg_demux::parse_packet: unexpected packet id 0x%02X!!", id);
/* return total number of bytes */
return FALSE;
}
/* create the buffer and send it off to the Other Side */
if (GST_PAD_IS_CONNECTED(*outpad) && datalen > 0) {
/* if this is part of the buffer, create a subbuffer */
GST_DEBUG (0,"mpeg_demux::parse_packet: creating subbuffer len %d", datalen);
outbuf = gst_buffer_create_sub (buffer, headerlen+4, datalen);
GST_BUFFER_OFFSET (outbuf) = outoffset;
if (pts != -1) {
GST_BUFFER_TIMESTAMP (outbuf) = (pts * 100LL)/9LL;
}
else {
GST_BUFFER_TIMESTAMP (outbuf) = -1LL;
}
GST_DEBUG (0,"mpeg_demux::parse_packet: pushing buffer of len %d id %d, ts %lld",
datalen, id, GST_BUFFER_TIMESTAMP (outbuf));
gst_pad_push ((*outpad), outbuf);
}
return TRUE;
}
static gboolean
gst_mpeg_demux_parse_pes (GstMPEGParse *mpeg_parse, GstBuffer *buffer)
{
GstMPEGDemux *mpeg_demux = GST_MPEG_DEMUX (mpeg_parse);
guint8 id;
gint64 pts = -1;
guint16 packet_length;
guint8 header_data_length = 0;
guint16 datalen;
gulong outoffset = 0; /* wrong XXX FIXME */
guint16 headerlen;
guint8 ps_id_code = 0x80;
GstPad **outpad = NULL;
GstBuffer *outbuf;
GstPadTemplate *newtemp = NULL;
guint8 *buf, *basebuf;
GST_DEBUG (0,"mpeg_demux: in parse_pes");
basebuf = buf = GST_BUFFER_DATA (buffer);
id = *(buf+3);
buf += 4;
/* start parsing */
packet_length = GUINT16_FROM_BE (*((guint16 *)buf));
GST_DEBUG (0,"mpeg_demux: got packet_length %d", packet_length);
buf += 2;
/* we don't operate on: program_stream_map, padding_stream, */
/* private_stream_2, ECM, EMM, or program_stream_directory */
if ((id != 0xBC) && (id != 0xBE) && (id != 0xBF) && (id != 0xF0) &&
(id != 0xF1) && (id != 0xFF))
{
guchar flags1 = *buf++;
guchar flags2 = *buf++;
if ((flags1 & 0xC0) != 0x80) {
return FALSE;
}
header_data_length = *buf++;
GST_DEBUG (0,"mpeg_demux: header_data_length is %d",header_data_length);
/* check for PTS */
if ((flags2 & 0x80)) {
/*if ((flags2 & 0x80) && id == 0xe0) { */
pts = (*buf++ & 0x0E) << 29;
pts |= *buf++ << 22;
pts |= (*buf++ & 0xFE) << 14;
pts |= *buf++ << 7;
pts |= (*buf++ & 0xFE) >> 1;
GST_DEBUG (0, "mpeg_demux::parse_packet: %x PTS = %llu", id, (pts*1000000LL)/90000LL);
}
if ((flags2 & 0x40)) {
GST_DEBUG (0, "mpeg_demux::parse_packet: %x DTS foundu", id);
buf += 5;
}
if ((flags2 & 0x20)) {
GST_DEBUG (0, "mpeg_demux::parse_packet: %x ESCR foundu", id);
buf += 6;
}
if ((flags2 & 0x10)) {
guint32 es_rate;
es_rate = (*buf++ & 0x07) << 14;
es_rate |= (*buf++ ) << 7;
es_rate |= (*buf++ & 0xFE) >> 1;
GST_DEBUG (0, "mpeg_demux::parse_packet: %x ES Rate foundu", id);
}
/* FIXME: lots of PES parsing missing here... */
}
/* calculate the amount of real data in this PES packet */
/* constant is 2 bytes packet_length, 2 bytes of bits, 1 byte header len */
headerlen = 5 + header_data_length;
/* constant is 2 bytes of bits, 1 byte header len */
datalen = packet_length - (3 + header_data_length);
GST_DEBUG (0,"mpeg_demux: headerlen is %d, datalen is %d",
headerlen, datalen);
/* private_stream_1 */
if (id == 0xBD) {
/* first find the track code */
ps_id_code = *(basebuf + headerlen + 4);
/* make sure it's valid */
if ((ps_id_code >= 0x80) && (ps_id_code <= 0x87)) {
GST_DEBUG (0,"mpeg_demux: we have a private_stream_1 (AC3) packet, track %d",
ps_id_code - 0x80);
outpad = &mpeg_demux->private_1_pad[ps_id_code - 0x80];
/* scrap first 4 bytes (so-called "mystery AC3 tag") */
headerlen += 4;
datalen -= 4;
outoffset = mpeg_demux->private_1_offset[ps_id_code - 0x80];
mpeg_demux->private_1_offset[ps_id_code - 0x80] += datalen;
}
else if ((ps_id_code >= 0x20) && (ps_id_code <= 0x2f)) {
GST_DEBUG (0,"mpeg_demux: we have a subtitle_stream packet, track %d",
ps_id_code - 0x20);
outpad = &mpeg_demux->subtitle_pad[ps_id_code - 0x20];
headerlen += 1;
datalen -= 1;
outoffset = mpeg_demux->subtitle_offset[ps_id_code - 0x20];
mpeg_demux->subtitle_offset[ps_id_code - 0x20] += datalen;
}
/* private_stream_1 */
} else if (id == 0xBF) {
GST_DEBUG (0,"mpeg_demux: we have a private_stream_2 packet");
outpad = &mpeg_demux->private_2_pad;
outoffset = mpeg_demux->private_2_offset;
mpeg_demux->private_2_offset += datalen;
/* audio */
} else if ((id >= 0xC0) && (id <= 0xDF)) {
GST_DEBUG (0,"mpeg_demux: we have an audio packet");
outpad = &mpeg_demux->audio_pad[id - 0xC0];
outoffset = mpeg_demux->audio_offset[id & 0x1F];
mpeg_demux->audio_offset[id & 0x1F] += datalen;
if (pts == -1)
pts = mpeg_demux->audio_PTS[id & 0x1F];
else
mpeg_demux->audio_PTS[id & 0x1F] = pts;
/* video */
} else if ((id >= 0xE0) && (id <= 0xEF)) {
GST_DEBUG (0,"mpeg_demux: we have a video packet");
outpad = &mpeg_demux->video_pad[id - 0xE0];
outoffset = mpeg_demux->video_offset[id & 0x0F];
mpeg_demux->video_offset[id & 0x0F] += datalen;
if (pts == -1)
pts = mpeg_demux->video_PTS[id & 0x1F];
else
mpeg_demux->video_PTS[id & 0x1F] = pts;
}
/* if we don't know what it is, bail */
if (outpad == NULL)
return TRUE;
/* create the pad and add it if we don't already have one. */
/* this should trigger the NEW_PAD signal, which should be caught by */
/* the app and used to attach to desired streams. */
if ((*outpad) == NULL) {
gchar *name = NULL;
/* we have to name the stream approriately */
if (id == 0xBD) {
if (ps_id_code >= 0x80 && ps_id_code <= 0x87) {
name = g_strdup_printf("private_stream_1.%d",ps_id_code - 0x80);
newtemp = GST_PAD_TEMPLATE_GET (private1_factory);
}
else if (ps_id_code >= 0x20 && ps_id_code <= 0x2f) {
name = g_strdup_printf("subtitle_stream_%d",ps_id_code - 0x20);
newtemp = GST_PAD_TEMPLATE_GET (subtitle_factory);
}
else {
name = g_strdup_printf("unknown_stream_%d",ps_id_code);
}
}
else if (id == 0xBF) {
name = g_strdup ("private_stream_2");
newtemp = GST_PAD_TEMPLATE_GET (private2_factory);
}
else if ((id >= 0xC0) && (id <= 0xDF)) {
name = g_strdup_printf("audio_%02d",id - 0xC0);
newtemp = GST_PAD_TEMPLATE_GET (audio_factory);
}
else if ((id >= 0xE0) && (id <= 0xEF)) {
name = g_strdup_printf("video_%02d",id - 0xE0);
newtemp = GST_PAD_TEMPLATE_GET (video_mpeg2_factory);
}
else {
name = g_strdup_printf("unknown");
}
if (newtemp) {
/* create the pad and add it to self */
(*outpad) = gst_pad_new_from_template (newtemp, name);
gst_pad_try_set_caps ((*outpad), gst_pad_get_pad_template_caps (*outpad));
gst_element_add_pad(GST_ELEMENT(mpeg_demux),(*outpad));
}
else {
g_warning ("mpeg_demux: cannot create pad %s, no template for %02x", name, id);
}
if (name)
g_free (name);
}
/* create the buffer and send it off to the Other Side */
if (GST_PAD_IS_CONNECTED(*outpad)) {
/* if this is part of the buffer, create a subbuffer */
GST_DEBUG (0,"mpeg_demux: creating subbuffer len %d", datalen);
outbuf = gst_buffer_create_sub (buffer, headerlen+4, datalen);
GST_BUFFER_OFFSET(outbuf) = outoffset;
GST_BUFFER_TIMESTAMP(outbuf) = (pts*100LL)/9LL;
gst_pad_push((*outpad),outbuf);
}
/* return total number of bytes */
return TRUE;
}
static GstElementStateReturn
gst_mpeg_demux_change_state (GstElement *element)
{
GstMPEGDemux *mpeg_demux = GST_MPEG_DEMUX (element);
gint i;
switch (GST_STATE_TRANSITION (element)) {
case GST_STATE_READY_TO_PAUSED:
break;
case GST_STATE_PAUSED_TO_READY:
for (i=0;i<NUM_VIDEO_PADS;i++) {
mpeg_demux->video_offset[i] = 0;
mpeg_demux->video_PTS[i] = 0;
}
for (i=0;i<NUM_AUDIO_PADS;i++) {
mpeg_demux->audio_offset[i] = 0;
mpeg_demux->audio_PTS[i] = 0;
}
break;
case GST_STATE_READY_TO_NULL:
break;
default:
break;
}
return GST_ELEMENT_CLASS (parent_class)->change_state (element);
}
gboolean
gst_mpeg_demux_plugin_init (GModule *module, GstPlugin *plugin)
{
GstElementFactory *factory;
/* this filter needs the bytestream package */
if (!gst_library_load ("gstbytestream")) {
gst_info ("mpeg_demux:: could not load support library: 'gstbytestream'\n");
return FALSE;
}
/* create an elementfactory for the mpeg_demux element */
factory = gst_element_factory_new ("mpegdemux", GST_TYPE_MPEG_DEMUX,
&mpeg_demux_details);
g_return_val_if_fail (factory != NULL, FALSE);
gst_element_factory_add_pad_template (factory, GST_PAD_TEMPLATE_GET (sink_factory));
gst_element_factory_add_pad_template (factory, GST_PAD_TEMPLATE_GET (video_mpeg1_factory));
gst_element_factory_add_pad_template (factory, GST_PAD_TEMPLATE_GET (video_mpeg2_factory));
gst_element_factory_add_pad_template (factory, GST_PAD_TEMPLATE_GET (private1_factory));
gst_element_factory_add_pad_template (factory, GST_PAD_TEMPLATE_GET (private2_factory));
gst_element_factory_add_pad_template (factory, GST_PAD_TEMPLATE_GET (subtitle_factory));
gst_element_factory_add_pad_template (factory, GST_PAD_TEMPLATE_GET (audio_factory));
gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));
return TRUE;
}
Reference in a new issue View git blame Copy permalink