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oggdemux: clean up fishead/fisbone parsing

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Remove some redundant code for parsing fishead streams. Actually use the data we
parsed (mostly start_time).
This commit is contained in:
Wim Taymans 2010-03-01 13:50:32 +01:00
parent f96caa17b3
commit 97319a6276
4 changed files with 103 additions and 84 deletions
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102
ext/ogg/gstoggdemux.c
View file

@ -373,75 +373,6 @@ gst_ogg_pad_reset (GstOggPad * pad)
pad->is_eos = FALSE;
}
/* called when the skeleton fishead is found. Caller ensures the packet is
* precisely the correct size; we don't re-check this here. */
static void
gst_ogg_pad_parse_skeleton_fishead (GstOggPad * pad, ogg_packet * packet)
{
GstOggDemux *ogg = pad->ogg;
guint8 *data = packet->packet;
guint16 major, minor;
gint64 prestime_n, prestime_d;
gint64 basetime_n, basetime_d;
/* skip "fishead\0" */
major = GST_READ_UINT16_LE (data + 8);
minor = GST_READ_UINT16_LE (data + 10);
prestime_n = (gint64) GST_READ_UINT64_LE (data + 12);
prestime_d = (gint64) GST_READ_UINT64_LE (data + 20);
basetime_n = (gint64) GST_READ_UINT64_LE (data + 28);
basetime_d = (gint64) GST_READ_UINT64_LE (data + 36);
ogg->basetime = gst_util_uint64_scale (GST_SECOND, basetime_n, basetime_d);
ogg->prestime = gst_util_uint64_scale (GST_SECOND, prestime_n, prestime_d);
ogg->have_fishead = TRUE;
pad->map.is_skeleton = TRUE;
pad->start_time = GST_CLOCK_TIME_NONE;
GST_INFO_OBJECT (ogg, "skeleton fishead parsed (basetime: %"
GST_TIME_FORMAT ", prestime: %" GST_TIME_FORMAT ")",
GST_TIME_ARGS (ogg->basetime), GST_TIME_ARGS (ogg->prestime));
}
/* function called when a skeleton fisbone is found. Caller ensures that
* the packet length is sufficient */
static void
gst_ogg_pad_parse_skeleton_fisbone (GstOggPad * pad, ogg_packet * packet)
{
GstOggPad *fisbone_pad;
gint64 start_granule;
guint32 serialno;
guint8 *data = packet->packet;
serialno = GST_READ_UINT32_LE (data + 12);
fisbone_pad = gst_ogg_chain_get_stream (pad->chain, serialno);
if (fisbone_pad) {
if (fisbone_pad->map.have_fisbone)
/* already parsed */
return;
fisbone_pad->map.have_fisbone = TRUE;
fisbone_pad->map.granulerate_n = GST_READ_UINT64_LE (data + 20);
fisbone_pad->map.granulerate_d = GST_READ_UINT64_LE (data + 28);
start_granule = GST_READ_UINT64_LE (data + 36);
fisbone_pad->map.preroll = GST_READ_UINT32_LE (data + 44);
fisbone_pad->map.granuleshift = GST_READ_UINT8 (data + 48);
GST_INFO_OBJECT (pad->ogg, "skeleton fisbone parsed "
"(serialno: %08x start time: %" GST_TIME_FORMAT
" granulerate_n: %d granulerate_d: %d "
" preroll: %" G_GUINT32_FORMAT " granuleshift: %d)",
serialno, GST_TIME_ARGS (fisbone_pad->start_time),
fisbone_pad->map.granulerate_n, fisbone_pad->map.granulerate_d,
fisbone_pad->map.preroll, fisbone_pad->map.granuleshift);
} else {
GST_WARNING_OBJECT (pad->ogg,
"found skeleton fisbone for an unknown stream %" G_GUINT32_FORMAT,
serialno);
}
}
/* queue data, basically takes the packet, puts it in a buffer and store the
* buffer in the queued list. */
static GstFlowReturn
@ -751,14 +682,16 @@ gst_ogg_pad_submit_packet (GstOggPad * pad, ogg_packet * packet)
pad->map.serialno);
if (!pad->have_type) {
if (!ogg->have_fishead && packet->bytes == SKELETON_FISHEAD_SIZE &&
!memcmp (packet->packet, "fishead\0", 8)) {
gst_ogg_pad_parse_skeleton_fishead (pad, packet);
}
pad->have_type = gst_ogg_stream_setup_map (&pad->map, packet);
if (!pad->have_type) {
pad->map.caps = gst_caps_new_simple ("application/x-unknown", NULL);
}
if (pad->map.is_skeleton) {
GST_DEBUG_OBJECT (ogg, "we have a fishead");
/* copy values over to global ogg level */
ogg->basetime = pad->map.basetime;
ogg->prestime = pad->map.prestime;
}
if (pad->map.caps) {
gst_pad_set_caps (GST_PAD (pad), pad->map.caps);
} else {
@ -766,9 +699,24 @@ gst_ogg_pad_submit_packet (GstOggPad * pad, ogg_packet * packet)
}
}
if (ogg->have_fishead && packet->bytes >= SKELETON_FISBONE_MIN_SIZE &&
!memcmp (packet->packet, "fisbone\0", 8)) {
gst_ogg_pad_parse_skeleton_fisbone (pad, packet);
if (pad->map.is_skeleton) {
guint32 serialno;
GstOggPad *fisbone_pad;
/* try to parse the serialno first */
if (gst_ogg_map_parse_fisbone (&pad->map, packet->packet, packet->bytes,
&serialno)) {
fisbone_pad = gst_ogg_chain_get_stream (pad->chain, serialno);
if (fisbone_pad) {
/* parse the remainder of the fisbone in the pad with the serialno */
gst_ogg_map_add_fisbone (&fisbone_pad->map, packet->packet,
packet->bytes, &fisbone_pad->start_time);
} else {
GST_WARNING_OBJECT (pad->ogg,
"found skeleton fisbone for an unknown stream %" G_GUINT32_FORMAT,
serialno);
}
}
}
granule = gst_ogg_stream_granulepos_to_granule (&pad->map,
@ -3415,7 +3363,6 @@ gst_ogg_demux_change_state (GstElement * element, GstStateChange transition)
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
ogg->basetime = 0;
ogg->have_fishead = FALSE;
ogg_sync_init (&ogg->sync);
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
@ -3441,7 +3388,6 @@ gst_ogg_demux_change_state (GstElement * element, GstStateChange transition)
GST_OBJECT_LOCK (ogg);
ogg->running = FALSE;
ogg->segment_running = FALSE;
ogg->have_fishead = FALSE;
GST_OBJECT_UNLOCK (ogg);
break;
case GST_STATE_CHANGE_READY_TO_NULL:

1
ext/ogg/gstoggdemux.h
View file

@ -160,7 +160,6 @@ struct _GstOggDemux
GstEvent *newsegment; /* pending newsegment to be sent from _loop */
/* annodex stuff */
gboolean have_fishead;
gint64 basetime;
gint64 prestime;

75
ext/ogg/gstoggstream.c
View file

@ -689,7 +689,6 @@ setup_fishead_mapper (GstOggStream * pad, ogg_packet * packet)
guint8 *data;
gint64 prestime_n, prestime_d;
gint64 basetime_n, basetime_d;
gint64 basetime;
data = packet->packet;
@ -706,18 +705,84 @@ setup_fishead_mapper (GstOggStream * pad, ogg_packet * packet)
/* FIXME: we don't use basetime anywhere in the demuxer! */
if (basetime_d != 0)
basetime = gst_util_uint64_scale (GST_SECOND, basetime_n, basetime_d);
pad->basetime = gst_util_uint64_scale (GST_SECOND, basetime_n, basetime_d);
else
basetime = -1;
pad->basetime = -1;
GST_INFO ("skeleton fishead parsed (basetime: %" GST_TIME_FORMAT ")",
GST_TIME_ARGS (basetime));
if (prestime_d != 0)
pad->prestime = gst_util_uint64_scale (GST_SECOND, prestime_n, prestime_d);
else
pad->prestime = -1;
GST_INFO ("skeleton fishead parsed (basetime: %" GST_TIME_FORMAT
", prestime: %" GST_TIME_FORMAT ")", GST_TIME_ARGS (pad->basetime),
GST_TIME_ARGS (pad->prestime));
pad->is_skeleton = TRUE;
return TRUE;
}
gboolean
gst_ogg_map_parse_fisbone (GstOggStream * pad, const guint8 * data, guint size,
guint32 * serialno)
{
if (size < SKELETON_FISBONE_MIN_SIZE) {
GST_WARNING ("small fisbone packet of size %d, ignoring", size);
return FALSE;
}
if (memcmp (data, "fisbone\0", 8) != 0) {
GST_WARNING ("unknown skeleton packet %10.10s", data);
return FALSE;
}
if (pad->have_fisbone) {
GST_DEBUG ("already have fisbone, ignoring second one");
return FALSE;
}
if (serialno)
*serialno = GST_READ_UINT32_LE (data + 12);
return TRUE;
}
gboolean
gst_ogg_map_add_fisbone (GstOggStream * pad,
const guint8 * data, guint size, GstClockTime * p_start_time)
{
GstClockTime start_time;
gint64 start_granule;
/* skip "fisbone\0" + headers offset + serialno + num headers */
data += 8 + 4 + 4 + 4;
pad->have_fisbone = TRUE;
/* we just overwrite whatever was set before by the format-specific setup */
pad->granulerate_n = GST_READ_UINT64_LE (data);
pad->granulerate_d = GST_READ_UINT64_LE (data + 8);
start_granule = GST_READ_UINT64_LE (data + 16);
pad->preroll = GST_READ_UINT32_LE (data + 24);
pad->granuleshift = GST_READ_UINT8 (data + 28);
start_time = granulepos_to_granule_default (pad, start_granule);
GST_INFO ("skeleton fisbone parsed "
"(start time: %" GST_TIME_FORMAT
" granulerate_n: %d granulerate_d: %d "
" preroll: %" G_GUINT32_FORMAT " granuleshift: %d)",
GST_TIME_ARGS (start_time),
pad->granulerate_n, pad->granulerate_d, pad->preroll, pad->granuleshift);
if (p_start_time)
*p_start_time = start_time;
return TRUE;
}
/* Do we need these for something?
* ogm->hdr.size = GST_READ_UINT32_LE (&data[13]);
* ogm->hdr.time_unit = GST_READ_UINT64_LE (&data[17]);

9
ext/ogg/gstoggstream.h
View file

@ -71,6 +71,10 @@ struct _GstOggStream
/* OGM stuff */
gboolean is_ogm;
gboolean is_ogm_text;
/* fishead stuff */
gint64 prestime;
gint64 basetime;
};
@ -90,6 +94,11 @@ gboolean gst_ogg_stream_granulepos_is_key_frame (GstOggStream *pad,
gboolean gst_ogg_stream_packet_is_header (GstOggStream *pad, ogg_packet *packet);
gint64 gst_ogg_stream_get_packet_duration (GstOggStream * pad, ogg_packet *packet);
gboolean gst_ogg_map_parse_fisbone (GstOggStream * pad, const guint8 * data, guint size,
guint32 * serialno);
gboolean gst_ogg_map_add_fisbone (GstOggStream * pad, const guint8 * data, guint size,
GstClockTime * p_start_time);
G_END_DECLS