static gboolean
do_seek (App * app)
{
gint64 in_pos, out_pos;
gfloat rate = 1.0;
GstFormat fmt = GST_FORMAT_TIME;
GstSeekFlags flags = 0;
int ret;
if (app->current_segment >= app->segment_count) {
GST_WARNING ("seek segment not found!");
return FALSE;
}
GST_INFO ("do_seek...");
flags |= GST_SEEK_FLAG_FLUSH;
// flags |= GST_SEEK_FLAG_ACCURATE;
flags |= GST_SEEK_FLAG_KEY_UNIT;
flags |= GST_SEEK_FLAG_SEGMENT;
gst_element_query_position ((app->pipeline), &fmt, &in_pos);
GST_DEBUG ("do_seek::initial gst_element_query_position = %lld ms",
in_pos / 1000000);
in_pos =
MPEGTIME_TO_GSTTIME (app->seek_segments[app->current_segment].in_pts);
GST_DEBUG ("do_seek::in_time for segment %i = %lld ms", app->current_segment,
in_pos / 1000000);
out_pos = -1;
// MPEGTIME_TO_GSTTIME (app->seek_segments[app->current_segment].out_pts);
GST_DEBUG ("do_seek::out_time for segment %i = %lld ms", app->current_segment,
out_pos / 1000000);
ret = gst_element_seek ((app->pipeline), rate, GST_FORMAT_TIME, flags,
GST_SEEK_TYPE_SET, in_pos, GST_SEEK_TYPE_SET, out_pos);
gst_element_query_position ((app->pipeline), &fmt, &in_pos);
GST_DEBUG
("do_seek::seek command returned %i. new gst_element_query_position = %lld ms",
ret, in_pos / 1000000);
if (ret)
app->current_segment++;
return ret;
}
static GstFlowReturn
gst_mpeg_demux_parse_pes (GstMPEGParse * mpeg_parse, GstBuffer * buffer)
{
GstMPEGDemux *mpeg_demux = GST_MPEG_DEMUX (mpeg_parse);
guint8 id;
guint16 packet_length;
guint8 header_data_length = 0;
guint16 datalen;
guint16 headerlen;
GstClockTime timestamp;
GstFlowReturn ret = GST_FLOW_OK;
GstMPEGStream *outstream = NULL;
guint8 *buf;
buf = GST_BUFFER_DATA (buffer);
id = *(buf + 3);
buf += 4;
/* start parsing */
packet_length = GST_READ_UINT16_BE (buf);
GST_DEBUG_OBJECT (mpeg_demux, "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_OBJECT (mpeg_demux, "header_data_length: %d", header_data_length);
/* check for PTS */
if ((flags2 & 0x80)) {
gint64 pts;
pts = ((guint64) (*buf++ & 0x0E)) << 29;
pts |= ((guint64) * buf++) << 22;
pts |= ((guint64) (*buf++ & 0xFE)) << 14;
pts |= ((guint64) * buf++) << 7;
pts |= ((guint64) (*buf++ & 0xFE)) >> 1;
/* Check for pts overflow */
if (mpeg_demux->last_pts != -1) {
gint32 diff = pts - mpeg_demux->last_pts;
if (diff > -4 * CLOCK_FREQ && diff < 4 * CLOCK_FREQ)
pts = mpeg_demux->last_pts + diff;
}
mpeg_demux->last_pts = pts;
timestamp = PARSE_CLASS (mpeg_parse)->adjust_ts (mpeg_parse,
MPEGTIME_TO_GSTTIME (pts));
GST_DEBUG_OBJECT (mpeg_demux,
"0x%02x (% " G_GINT64_FORMAT ") PTS = %" G_GUINT64_FORMAT, id, pts,
MPEGTIME_TO_GSTTIME (pts));
} else {
static GstFlowReturn
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;
gint64 pts = -1;
guint16 datalen;
GstMPEGStream *outstream = NULL;
guint8 *buf, *basebuf;
gint64 timestamp;
GstFlowReturn ret = GST_FLOW_OK;
basebuf = buf = GST_BUFFER_DATA (buffer);
id = *(buf + 3);
buf += 4;
/* start parsing */
packet_length = GST_READ_UINT16_BE (buf);
GST_DEBUG_OBJECT (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_OBJECT (mpeg_demux, "have stuffing byte");
} else {
GST_DEBUG_OBJECT (mpeg_demux, "expected stuffing byte");
}
headerlen++;
break;
case 0x40:
GST_DEBUG_OBJECT (mpeg_demux, "have STD");
STD_buffer_bound_scale = bits & 0x20;
STD_buffer_size_bound = ((guint16) (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 = ((guint64) (bits & 0x0E)) << 29;
pts |= ((guint64) (*buf++)) << 22;
pts |= ((guint64) (*buf++ & 0xFE)) << 14;
pts |= ((guint64) (*buf++)) << 7;
pts |= ((guint64) (*buf++ & 0xFE)) >> 1;
GST_DEBUG_OBJECT (mpeg_demux, "PTS = %" G_GUINT64_FORMAT, pts);
headerlen += 5;
goto done;
case 0x30:
/* pts:3 ! 1 ! pts:15 ! 1 | pts:15 ! 1 */
pts = ((guint64) (bits & 0x0E)) << 29;
pts |= ((guint64) (*buf++)) << 22;
pts |= ((guint64) (*buf++ & 0xFE)) << 14;
pts |= ((guint64) (*buf++)) << 7;
pts |= ((guint64) (*buf++ & 0xFE)) >> 1;
/* sync:4 ! pts:3 ! 1 ! pts:15 ! 1 | pts:15 ! 1 */
dts = ((guint64) (*buf++ & 0x0E)) << 29;
dts |= ((guint64) * buf++) << 22;
dts |= ((guint64) (*buf++ & 0xFE)) << 14;
dts |= ((guint64) * buf++) << 7;
dts |= ((guint64) (*buf++ & 0xFE)) >> 1;
GST_DEBUG_OBJECT (mpeg_demux, "PTS = %" G_GUINT64_FORMAT
", DTS = %" G_GUINT64_FORMAT, pts, dts);
headerlen += 10;
goto done;
case 0x00:
GST_DEBUG_OBJECT (mpeg_demux, "have no pts/dts");
GST_DEBUG_OBJECT (mpeg_demux, "got trailer bits %x", (bits & 0x0f));
if ((bits & 0x0f) != 0xf) {
GST_DEBUG_OBJECT (mpeg_demux, "not a valid packet time sequence");
return FALSE;
}
headerlen++;
default:
goto done;
}
default:
goto done;
}
} while (1);
GST_DEBUG_OBJECT (mpeg_demux, "done with header loop");
done:
/* calculate the amount of real data in this packet */
datalen = packet_length - headerlen + 2;
GST_DEBUG_OBJECT (mpeg_demux, "headerlen is %d, datalen is %d",
headerlen, datalen);
if (pts != -1) {
/* Check for pts overflow */
if (mpeg_demux->last_pts != -1) {
gint32 diff = pts - mpeg_demux->last_pts;
if (diff > -4 * CLOCK_FREQ && diff < 4 * CLOCK_FREQ)
pts = mpeg_demux->last_pts + diff;
}
mpeg_demux->last_pts = pts;
timestamp = PARSE_CLASS (mpeg_parse)->adjust_ts (mpeg_parse,
MPEGTIME_TO_GSTTIME (pts));
/* this apparently happens for some input were headers are
* rewritten to make time start at zero... */
if ((gint64) timestamp < 0)
timestamp = 0;
} else {
timestamp = GST_CLOCK_TIME_NONE;
}
if (id == 0xBD) {
/* Private stream 1. */
GST_DEBUG_OBJECT (mpeg_demux, "we have a private 1 packet");
ret = CLASS (mpeg_demux)->process_private (mpeg_demux, buffer, 0, timestamp,
headerlen, datalen);
} else if (id == 0xBF) {
/* Private stream 2. */
GST_DEBUG_OBJECT (mpeg_demux, "we have a private 2 packet");
ret = CLASS (mpeg_demux)->process_private (mpeg_demux, buffer, 1, timestamp,
headerlen, datalen);
} else if (id >= 0xC0 && id <= 0xDF) {
/* Audio. */
GST_DEBUG_OBJECT (mpeg_demux, "we have an audio packet");
outstream = CLASS (mpeg_demux)->get_audio_stream (mpeg_demux,
id - 0xC0, GST_MPEG_DEMUX_AUDIO_MPEG, NULL);
ret = CLASS (mpeg_demux)->send_subbuffer (mpeg_demux, outstream, buffer,
timestamp, headerlen + 4, datalen);
} else if (id >= 0xE0 && id <= 0xEF) {
/* Video. */
gint mpeg_version = !GST_MPEG_PARSE_IS_MPEG2 (mpeg_demux) ? 1 : 2;
GST_DEBUG_OBJECT (mpeg_demux, "we have a video packet");
outstream = CLASS (mpeg_demux)->get_video_stream (mpeg_demux,
id - 0xE0, GST_MPEG_DEMUX_VIDEO_MPEG, &mpeg_version);
ret = CLASS (mpeg_demux)->send_subbuffer (mpeg_demux, outstream, buffer,
timestamp, headerlen + 4, datalen);
} else if (id == 0xBE) {
/* padding stream */
GST_DEBUG_OBJECT (mpeg_demux, "we have a padding packet");
} else {
GST_WARNING_OBJECT (mpeg_demux, "unknown stream id 0x%02x", id);
}
return ret;
}
