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gstreamer/gst/mpegstream/gstmpegdemux.c
Wim Taymans 1ac9874937 - update OFFSET field 
Original commit message from CVS:
- update OFFSET field
- flush unkown codes
- small cleanups
2003-05-24 10:17:50 +00:00

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/* 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",
"LGPL",
"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/x-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 (pcm_factory,
"pcm_stream_%02d",
GST_PAD_SRC,
GST_PAD_SOMETIMES,
GST_CAPS_NEW (
"mpeg_demux_pcm",
"audio/raw",
"format", GST_PROPS_STRING ("int"),
"law", GST_PROPS_INT (0),
"endianness", GST_PROPS_INT (G_BIG_ENDIAN),
"signed", GST_PROPS_BOOLEAN (TRUE),
"width", GST_PROPS_LIST (
GST_PROPS_INT (16),
GST_PROPS_INT (20),
GST_PROPS_INT (24)
),
"depth", GST_PROPS_LIST (
GST_PROPS_INT (16),
GST_PROPS_INT (20),
GST_PROPS_INT (24)
),
"rate", GST_PROPS_LIST (
GST_PROPS_INT (48000),
GST_PROPS_INT (96000)
),
"channels", GST_PROPS_INT_RANGE (1, 8)
)
);
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, GstClockTime time);
static void gst_mpeg_demux_lpcm_set_caps (GstPad *pad, guint8 sample_info);
static void gst_mpeg_demux_dvd_audio_clear (GstMPEGDemux *mpeg_demux, int channel);
static void gst_mpeg_demux_handle_discont (GstMPEGParse *mpeg_parse);
static gboolean gst_mpeg_demux_handle_src_event (GstPad *pad, GstEvent *event);
const GstFormat* gst_mpeg_demux_get_src_formats (GstPad *pad);
static void gst_mpeg_demux_set_index (GstElement *element, GstIndex *index);
static GstIndex* gst_mpeg_demux_get_index (GstElement *element);
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;
gstelement_class->set_index = gst_mpeg_demux_set_index;
gstelement_class->get_index = gst_mpeg_demux_get_index;
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;
mpeg_parse_class->handle_discont = gst_mpeg_demux_handle_discont;
}
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_STREAMS;i++) {
mpeg_demux->private_1_stream[i] = NULL;
}
for (i=0;i<NUM_PCM_STREAMS;i++) {
mpeg_demux->pcm_stream[i] = NULL;
}
for (i=0;i<NUM_SUBTITLE_STREAMS;i++) {
mpeg_demux->subtitle_stream[i] = NULL;
}
mpeg_demux->private_2_stream = NULL;
for (i=0;i<NUM_VIDEO_STREAMS;i++) {
mpeg_demux->video_stream[i] = NULL;
}
for (i=0;i<NUM_AUDIO_STREAMS;i++) {
mpeg_demux->audio_stream[i] = NULL;
}
GST_FLAG_SET (mpeg_demux, GST_ELEMENT_EVENT_AWARE);
}
static GstMPEGStream*
gst_mpeg_demux_new_stream (void)
{
GstMPEGStream *stream;
stream = g_new0 (GstMPEGStream, 1);
return stream;
}
static void
gst_mpeg_demux_send_data (GstMPEGParse *mpeg_parse, GstData *data, GstClockTime time)
{
/* GstMPEGDemux *mpeg_demux = GST_MPEG_DEMUX (mpeg_parse); */
if (GST_IS_BUFFER (data)) {
gst_buffer_unref (GST_BUFFER (data));
}
else {
GstEvent *event = GST_EVENT (data);
switch (GST_EVENT_TYPE (event)) {
default:
gst_pad_event_default (mpeg_parse->sinkpad, event);
break;
}
}
}
static void
gst_mpeg_demux_handle_discont (GstMPEGParse *mpeg_parse)
{
GstMPEGDemux *mpeg_demux = GST_MPEG_DEMUX (mpeg_parse);
gint64 current_time = MPEGTIME_TO_GSTTIME (mpeg_parse->current_scr);
gint i;
GST_DEBUG (GST_CAT_EVENT, "discont %" G_GUINT64_FORMAT "\n", current_time);
for (i=0;i<NUM_VIDEO_STREAMS;i++) {
if (mpeg_demux->video_stream[i] &&
GST_PAD_IS_USABLE (mpeg_demux->video_stream[i]->pad))
{
GstEvent *discont;
discont = gst_event_new_discontinuous (FALSE, GST_FORMAT_TIME,
current_time, NULL);
gst_pad_push (mpeg_demux->video_stream[i]->pad, GST_BUFFER (discont));
}
if (mpeg_demux->audio_stream[i] &&
GST_PAD_IS_USABLE (mpeg_demux->audio_stream[i]->pad))
{
GstEvent *discont;
discont = gst_event_new_discontinuous (FALSE, GST_FORMAT_TIME,
current_time, NULL);
gst_pad_push (mpeg_demux->audio_stream[i]->pad, GST_BUFFER (discont));
}
}
}
static gboolean
gst_mpeg_demux_parse_packhead (GstMPEGParse *mpeg_parse, GstBuffer *buffer)
{
guint8 *buf;
parent_class->parse_packhead (mpeg_parse, buffer);
GST_DEBUG (0, "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, "in parse_syshead");
buf = GST_BUFFER_DATA (buffer);
buf += 4;
header_length = GUINT16_FROM_BE (*(guint16 *) buf);
GST_DEBUG (0, "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, "number of streams=%d ",
stream_count);
for (i = 0; i < stream_count; i++) {
guint8 stream_id;
gboolean STD_buffer_bound_scale;
guint16 STD_buffer_size_bound;
guint32 buf_byte_size_bound;
gchar *name = NULL;
GstMPEGStream **outstream = NULL;
GstPadTemplate *newtemp = NULL;
stream_id = *buf++;
if (!(stream_id & 0x80)) {
GST_DEBUG (0, "error in system header length");
return FALSE;
}
/* check marker bits */
if ((*buf & 0xC0) != 0xC0) {
GST_DEBUG (0, "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;
}
if (stream_id == 0xBD) {
/* private_stream_1 */
name = NULL;
outstream = NULL;
} else if (stream_id == 0xBF) {
/* private_stream_2 */
name = g_strdup_printf ("private_stream_2");
outstream = &mpeg_demux->private_2_stream;
newtemp = GST_PAD_TEMPLATE_GET (private2_factory);
} else if (stream_id >= 0xC0 && stream_id < 0xE0) {
/* Audio */
name = g_strdup_printf ("audio_%02d", stream_id & 0x1F);
outstream = &mpeg_demux->audio_stream[stream_id & 0x1F];
newtemp = GST_PAD_TEMPLATE_GET (audio_factory);
} else if (stream_id >= 0xE0 && stream_id < 0xF0) {
/* Video */
name = g_strdup_printf ("video_%02d", stream_id & 0x0F);
outstream = &mpeg_demux->video_stream[stream_id & 0x0F];
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);
}
} else {
GST_DEBUG (0, "unkown stream id %d", stream_id);
}
GST_DEBUG (0, "stream ID 0x%02X (%s)", stream_id, name);
GST_DEBUG (0, "STD_buffer_bound_scale %d", STD_buffer_bound_scale);
GST_DEBUG (0, "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 (outstream && *outstream == NULL) {
GstPad **outpad;
GstCaps *caps;
*outstream = gst_mpeg_demux_new_stream ();
outpad = &((*outstream)->pad);
*outpad = gst_pad_new_from_template (newtemp, name);
caps = gst_pad_template_get_caps (newtemp);
gst_pad_try_set_caps (*outpad, caps);
gst_caps_unref (caps);
gst_pad_set_formats_function (*outpad, gst_mpeg_demux_get_src_formats);
gst_pad_set_convert_function (*outpad, gst_mpeg_parse_convert_src);
gst_pad_set_event_mask_function (*outpad, gst_mpeg_parse_get_src_event_masks);
gst_pad_set_event_function (*outpad, gst_mpeg_demux_handle_src_event);
gst_pad_set_query_type_function (*outpad, gst_mpeg_parse_get_src_query_types);
gst_pad_set_query_function (*outpad, gst_mpeg_parse_handle_src_query);
gst_element_add_pad (GST_ELEMENT (mpeg_demux), (*outpad));
gst_pad_set_element_private (*outpad, *outstream);
(*outstream)->size_bound = buf_byte_size_bound;
mpeg_demux->total_size_bound += buf_byte_size_bound;
if (mpeg_demux->index) {
gst_index_get_writer_id (mpeg_demux->index, GST_OBJECT (*outpad),
&(*outstream)->index_id);
}
if (GST_PAD_IS_USABLE (*outpad)) {
GstEvent *event;
gint64 time;
time = mpeg_parse->current_scr;
event = gst_event_new_discontinuous (FALSE, GST_FORMAT_TIME,
MPEGTIME_TO_GSTTIME (time), NULL);
gst_pad_push (*outpad, GST_BUFFER (event));
}
}
else {
/* we won't be needing this. */
if (name)
g_free (name);
}
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;
GstMPEGStream **outstream = NULL;
GstPad *outpad = NULL;
GstBuffer *outbuf;
guint8 *buf, *basebuf;
gint64 timestamp;
GST_DEBUG (0, "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, "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, "have stuffing byte");
} else {
GST_DEBUG (0, "expected stuffing byte");
}
headerlen++;
break;
case 0x40:
GST_DEBUG (0, "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, "PTS = %" G_GUINT64_FORMAT, 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, "PTS = %" G_GUINT64_FORMAT ", DTS = %" G_GUINT64_FORMAT, pts, dts);
headerlen += 10;
goto done;
case 0x00:
GST_DEBUG (0, "have no pts/dts");
GST_DEBUG (0, "got trailer bits %x", (bits & 0x0f));
if ((bits & 0x0f) != 0xf) {
GST_DEBUG (0, "not a valid packet time sequence");
return FALSE;
}
headerlen++;
default:
goto done;
}
default:
goto done;
}
} while (1);
GST_DEBUG (0, "done with header loop");
done:
/* calculate the amount of real data in this packet */
datalen = packet_length - headerlen+2;
GST_DEBUG (0, "headerlen is %d, datalen is %d",
headerlen,datalen);
if (id == 0xBD) {
/* private_stream_1 */
/* first find the track code */
ps_id_code = *(basebuf + headerlen);
if (ps_id_code >= 0x80 && ps_id_code <= 0x87) {
/* make sure it's valid */
GST_DEBUG (0, "0x%02X: we have a private_stream_1 (AC3) packet, track %d",
id, ps_id_code - 0x80);
outstream = &mpeg_demux->private_1_stream[ps_id_code - 0x80];
/* scrap first 4 bytes (so-called "mystery AC3 tag") */
headerlen += 4;
datalen -= 4;
}
} else if (id == 0xBF) {
/* private_stream_2 */
GST_DEBUG (0, "0x%02X: we have a private_stream_2 packet", id);
outstream = &mpeg_demux->private_2_stream;
} else if (id >= 0xC0 && id <= 0xDF) {
/* audio */
GST_DEBUG (0, "0x%02X: we have an audio packet", id);
outstream = &mpeg_demux->audio_stream[id & 0x1F];
} else if (id >= 0xE0 && id <= 0xEF) {
/* video */
GST_DEBUG (0, "0x%02X: we have a video packet", id);
outstream = &mpeg_demux->video_stream[id & 0x0F];
}
/* if we don't know what it is, bail */
if (outstream == NULL) {
GST_DEBUG (0, "unknown packet id 0x%02X !!", id);
return FALSE;
}
outpad = (*outstream)->pad;
/* the pad should have been created in parse_syshead */
if (outpad == NULL) {
GST_DEBUG (0, "unexpected packet id 0x%02X!!", id);
return FALSE;
}
/* attach pts, if any */
if (pts != -1) {
pts += mpeg_parse->adjust;
timestamp = MPEGTIME_TO_GSTTIME (pts);
if (mpeg_demux->index) {
gst_index_add_association (mpeg_demux->index,
(*outstream)->index_id, 0,
GST_FORMAT_BYTES, GST_BUFFER_OFFSET (buffer),
GST_FORMAT_TIME, timestamp,
0);
}
}
else {
timestamp = GST_CLOCK_TIME_NONE;
}
/* create the buffer and send it off to the Other Side */
if (GST_PAD_IS_LINKED (outpad) && datalen > 0) {
GST_DEBUG (0, "creating subbuffer len %d", datalen);
/* if this is part of the buffer, create a subbuffer */
outbuf = gst_buffer_create_sub (buffer, headerlen + 4, datalen);
GST_BUFFER_TIMESTAMP (outbuf) = timestamp;
GST_BUFFER_OFFSET (outbuf) = GST_BUFFER_OFFSET (buffer) + headerlen + 4;
GST_DEBUG (0, "pushing buffer of len %d id %d, ts %" G_GINT64_FORMAT,
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;
guint16 headerlen;
guint8 ps_id_code = 0x80;
GstMPEGStream **outstream = NULL;
GstPad **outpad = NULL;
GstBuffer *outbuf;
GstPadTemplate *newtemp = NULL;
guint8 *buf, *basebuf;
GST_DEBUG (0, "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, "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, "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, "%x PTS = %" G_GUINT64_FORMAT,
id, MPEGTIME_TO_GSTTIME (pts));
}
if ((flags2 & 0x40)) {
GST_DEBUG (0, "%x DTS found", id);
buf += 5;
}
if ((flags2 & 0x20)) {
GST_DEBUG (0, "%x ESCR found", 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, "%x ES Rate found", 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, "headerlen is %d, datalen is %d",
headerlen, datalen);
if (id == 0xBD) {
/* private_stream_1 */
/* first find the track code */
ps_id_code = *(basebuf + headerlen + 4);
if (ps_id_code >= 0x80 && ps_id_code <= 0x87) {
GST_DEBUG (0, "we have a private_stream_1 (AC3) packet, track %d",
ps_id_code - 0x80);
outstream = &mpeg_demux->private_1_stream[ps_id_code - 0x80];
/* scrap first 4 bytes (so-called "mystery AC3 tag") */
headerlen += 4;
datalen -= 4;
} else if (ps_id_code >= 0xA0 && ps_id_code <= 0xA7) {
GST_DEBUG (0, "we have a pcm_stream packet, track %d",
ps_id_code - 0xA0);
outstream = &mpeg_demux->pcm_stream[ps_id_code - 0xA0];
/* Check for changes in the sample format. */
if (*outstream != NULL &&
basebuf[headerlen + 9] !=
mpeg_demux->lpcm_sample_info[ps_id_code - 0xA0]) {
/* Change the pad caps.*/
gst_mpeg_demux_lpcm_set_caps((*outstream)->pad, basebuf[headerlen + 9]);
}
/* Store the sample info. */
mpeg_demux->lpcm_sample_info[ps_id_code - 0xA0] =
basebuf[headerlen + 9];
/* Get rid of the LPCM header. */
headerlen += 7;
datalen -= 7;
} else if (ps_id_code >= 0x20 && ps_id_code <= 0x2F) {
GST_DEBUG (0, "we have a subtitle_stream packet, track %d",
ps_id_code - 0x20);
outstream = &mpeg_demux->subtitle_stream[ps_id_code - 0x20];
headerlen += 1;
datalen -= 1;
} else {
GST_DEBUG (0, "0x%02X: unkonwn id %x",
id, ps_id_code);
}
} else if (id == 0xBF) {
/* private_stream_2 */
GST_DEBUG (0, "we have a private_stream_2 packet");
outstream = &mpeg_demux->private_2_stream;
} else if (id >= 0xC0 && id <= 0xDF) {
/* audio */
GST_DEBUG (0, "we have an audio packet");
outstream = &mpeg_demux->audio_stream[id - 0xC0];
} else if (id >= 0xE0 && id <= 0xEF) {
/* video */
GST_DEBUG (0, "we have a video packet");
outstream = &mpeg_demux->video_stream[id - 0xE0];
} else {
GST_DEBUG (0, "we have a unkown packet");
}
/* if we don't know what it is, bail */
if (outstream == 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 ((*outstream) == NULL) {
gchar *name = NULL;
/* we have to name the stream approriately */
if (id == 0xBD) {
/* private_stream_1 */
if (ps_id_code >= 0x80 && ps_id_code <= 0x87) {
/* Erase any DVD audio pads. */
gst_mpeg_demux_dvd_audio_clear (mpeg_demux, ps_id_code - 0x80);
name = g_strdup_printf ("private_stream_1_%d",ps_id_code - 0x80);
newtemp = GST_PAD_TEMPLATE_GET (private1_factory);
} else if (ps_id_code >= 0xA0 && ps_id_code <= 0xA7) {
/* Erase any DVD audio pads. */
gst_mpeg_demux_dvd_audio_clear (mpeg_demux, ps_id_code - 0xA0);
name = g_strdup_printf ("pcm_stream_%d", ps_id_code - 0xA0);
newtemp = GST_PAD_TEMPLATE_GET (pcm_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) {
/* private_stream_2 */
name = g_strdup ("private_stream_2");
newtemp = GST_PAD_TEMPLATE_GET (private2_factory);
} else if (id >= 0xC0 && id <= 0xDF) {
/* audio */
name = g_strdup_printf ("audio_%02d", id - 0xC0);
newtemp = GST_PAD_TEMPLATE_GET (audio_factory);
} else if (id >= 0xE0 && id <= 0xEF) {
/* video */
name = g_strdup_printf ("video_%02d", id - 0xE0);
newtemp = GST_PAD_TEMPLATE_GET (video_mpeg2_factory);
} else {
/* unkown */
name = g_strdup_printf ("unknown");
}
if (newtemp) {
GstCaps *caps;
*outstream = gst_mpeg_demux_new_stream ();
outpad = &((*outstream)->pad);
/* create the pad and add it to self */
*outpad = gst_pad_new_from_template (newtemp, name);
if (ps_id_code < 0xA0 || ps_id_code > 0xA7) {
caps = gst_pad_template_get_caps (newtemp);
gst_pad_try_set_caps (*outpad, caps);
gst_caps_unref (caps);
}
else {
gst_mpeg_demux_lpcm_set_caps(*outpad,
mpeg_demux->lpcm_sample_info[ps_id_code
- 0xA0]);
}
gst_pad_set_formats_function (*outpad, gst_mpeg_demux_get_src_formats);
gst_pad_set_convert_function (*outpad, gst_mpeg_parse_convert_src);
gst_pad_set_event_mask_function (*outpad, gst_mpeg_parse_get_src_event_masks);
gst_pad_set_event_function (*outpad, gst_mpeg_demux_handle_src_event);
gst_pad_set_query_type_function (*outpad, gst_mpeg_parse_get_src_query_types);
gst_pad_set_query_function (*outpad, gst_mpeg_parse_handle_src_query);
gst_element_add_pad(GST_ELEMENT(mpeg_demux), *outpad);
gst_pad_set_element_private (*outpad, *outstream);
if (mpeg_demux->index) {
gst_index_get_writer_id (mpeg_demux->index, GST_OBJECT (*outpad),
&(*outstream)->index_id);
}
}
else {
g_warning ("cannot create pad %s, no template for %02x", name, id);
}
if (name)
g_free (name);
}
if (*outstream) {
gint64 timestamp;
outpad = &((*outstream)->pad);
/* attach pts, if any */
if (pts != -1) {
pts += mpeg_parse->adjust;
timestamp = MPEGTIME_TO_GSTTIME (pts);
if (mpeg_demux->index) {
gst_index_add_association (mpeg_demux->index,
(*outstream)->index_id, 0,
GST_FORMAT_BYTES, GST_BUFFER_OFFSET (buffer),
GST_FORMAT_TIME, timestamp,
0);
}
}
else {
timestamp = GST_CLOCK_TIME_NONE;
}
/* create the buffer and send it off to the Other Side */
if (*outpad && GST_PAD_IS_USABLE(*outpad)) {
/* if this is part of the buffer, create a subbuffer */
GST_DEBUG (0,"creating subbuffer len %d", datalen);
outbuf = gst_buffer_create_sub (buffer, headerlen+4, datalen);
GST_BUFFER_TIMESTAMP (outbuf) = timestamp;
GST_BUFFER_OFFSET (outbuf) = GST_BUFFER_OFFSET (buffer) + headerlen + 4;
gst_pad_push(*outpad,outbuf);
}
}
return TRUE;
}
/**
* Set the capabilities of the given pad based on the provided LPCM
* sample information.
*/
static void
gst_mpeg_demux_lpcm_set_caps (GstPad *pad, guint8 sample_info)
{
gint width, rate, channels;
GstCaps *caps;
/* Determine the sample width. */
switch (sample_info & 0xC0) {
case 0x80:
width = 24;
break;
case 0x40:
width = 20;
break;
default:
width = 16;
break;
}
/* Determine the rate. */
if (sample_info & 0x10) {
rate = 96000;
}
else {
rate = 48000;
}
/* Determine the number of channels. */
channels = (sample_info & 0x7) + 1;
caps = GST_CAPS_NEW (
"mpeg_demux_pcm",
"audio/raw",
"format", GST_PROPS_STRING ("int"),
"law", GST_PROPS_INT (0),
"endianness", GST_PROPS_INT (G_BIG_ENDIAN),
"signed", GST_PROPS_BOOLEAN (TRUE),
"width", GST_PROPS_INT (width),
"depth", GST_PROPS_INT (width),
"rate", GST_PROPS_INT (rate),
"channels", GST_PROPS_INT (channels)
);
gst_pad_try_set_caps (pad, caps);
}
/**
* Erase the DVD audio pad (if any) associated to the given channel.
*/
static void
gst_mpeg_demux_dvd_audio_clear (GstMPEGDemux *mpeg_demux, int channel)
{
GstMPEGStream **stream = NULL;
if (mpeg_demux->private_1_stream[channel] != NULL) {
stream = &mpeg_demux->private_1_stream[channel];
}
else if (mpeg_demux->pcm_stream[channel] != NULL) {
stream = &mpeg_demux->pcm_stream[channel];
}
if (stream == NULL) {
return;
}
gst_pad_unlink ((*stream)->pad, gst_pad_get_peer((*stream)->pad));
gst_element_remove_pad (GST_ELEMENT (mpeg_demux), (*stream)->pad);
g_free (*stream);
*stream = NULL;
}
const GstFormat*
gst_mpeg_demux_get_src_formats (GstPad *pad)
{
static const GstFormat formats[] = {
GST_FORMAT_TIME, /* we prefer seeking on time */
GST_FORMAT_BYTES,
0
};
return formats;
}
static gboolean
index_seek (GstPad *pad, GstEvent *event, gint64 *offset)
{
GstIndexEntry *entry;
GstMPEGDemux *mpeg_demux = GST_MPEG_DEMUX (gst_pad_get_parent (pad));
GstMPEGStream *stream = gst_pad_get_element_private (pad);
entry = gst_index_get_assoc_entry (mpeg_demux->index, stream->index_id,
GST_INDEX_LOOKUP_BEFORE, 0,
GST_EVENT_SEEK_FORMAT (event),
GST_EVENT_SEEK_OFFSET (event));
if (!entry)
return FALSE;
if (gst_index_entry_assoc_map (entry, GST_FORMAT_BYTES, offset)) {
return TRUE;
}
return FALSE;
}
static gboolean
normal_seek (GstPad *pad, GstEvent *event, gint64 *offset)
{
gboolean res = FALSE;
gint64 adjust;
GstFormat format;
GstMPEGDemux *mpeg_demux = GST_MPEG_DEMUX (gst_pad_get_parent (pad));
format = GST_EVENT_SEEK_FORMAT (event);
res = gst_pad_convert (pad, GST_FORMAT_BYTES, mpeg_demux->total_size_bound,
&format, &adjust);
GST_DEBUG (0, "seek adjusted from %" G_GINT64_FORMAT " bytes to %" G_GINT64_FORMAT "\n", mpeg_demux->total_size_bound, adjust);
if (res)
*offset = MAX (GST_EVENT_SEEK_OFFSET (event) - adjust, 0);
return res;
}
static gboolean
gst_mpeg_demux_handle_src_event (GstPad *pad, GstEvent *event)
{
gboolean res = FALSE;
GstMPEGDemux *mpeg_demux = GST_MPEG_DEMUX (gst_pad_get_parent (pad));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_SEEK:
{
guint64 desired_offset;
if (mpeg_demux->index)
res = index_seek (pad, event, &desired_offset);
if (!res)
res = normal_seek (pad, event, &desired_offset);
if (res) {
GstEvent *new_event;
new_event = gst_event_new_seek (GST_EVENT_SEEK_TYPE (event), desired_offset);
gst_event_unref (event);
res = gst_mpeg_parse_handle_src_event (pad, new_event);
}
break;
}
default:
break;
}
return res;
}
static GstElementStateReturn
gst_mpeg_demux_change_state (GstElement *element)
{
/* GstMPEGDemux *mpeg_demux = GST_MPEG_DEMUX (element); */
switch (GST_STATE_TRANSITION (element)) {
case GST_STATE_READY_TO_PAUSED:
break;
case GST_STATE_PAUSED_TO_READY:
break;
case GST_STATE_READY_TO_NULL:
break;
default:
break;
}
return GST_ELEMENT_CLASS (parent_class)->change_state (element);
}
static void
gst_mpeg_demux_set_index (GstElement *element, GstIndex *index)
{
GstMPEGDemux *mpeg_demux;
GST_ELEMENT_CLASS (parent_class)->set_index (element, index);
mpeg_demux = GST_MPEG_DEMUX (element);
mpeg_demux->index = index;
}
static GstIndex*
gst_mpeg_demux_get_index (GstElement *element)
{
GstMPEGDemux *mpeg_demux;
mpeg_demux = GST_MPEG_DEMUX (element);
return mpeg_demux->index;
}
gboolean
gst_mpeg_demux_plugin_init (GModule *module, GstPlugin *plugin)
{
GstElementFactory *factory;
/* this filter needs the bytestream package */
if (!gst_library_load ("gstbytestream"))
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_set_rank (factory, GST_ELEMENT_RANK_PRIMARY);
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 (pcm_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;
}
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