Buffers would always start with timestamp 0 and we'd start streaming
from the first buffer, but live streams always start streaming from
the last fragment - 3 fragments in the playlist, which makes its
timestamp, as returned by get_next_fragment, be whatever position
they had in the playlist. This makes sure the position correctly
reports the position of the buffer in the playlist, and added a shifting
variable to allow seeking in the middle of fragments.
In some networks, especiall in 3G, a fragment download or playlist
update may fail. We allow for up to 3 consecutive failures, while using
the rfc's specs for retry delays before considering that there was an
error on the stream.
If we know that our camera source element produces buffers at the same
resolution and appropriate colourspace for the output, we don't need any
of the generic conversion elements in encodebin. This reduces caps
negotiation overheads among other things.
Fixes interesting race conditions that cause crashes in decodebin2
because pads are added/removed from child elements although they
should be in READY state already.
We should stop the update thread in PAUSED state and avoid fetching
new fragments when the queue is not empty. The queue should always be
empty since we push data into a queue. Also, in totem, if we seek and
pause the stream while it's buffering, then the state will stay playing
for some reason, so it's best not to continue fetching fragments forever.
This is to ensure that we reset the accumulate segment on the sinks
so if we start with audio only then switch to audio+video, then both
sinks will have the same segments and will be synchronized.
If we cancel the fetch and call the stop_fetcher, which holds the lock,
when it sets the fetcher's state to NULL, it might send an error
on the bus. In that case, we must ignore it, otherwise it will try
to take the lock and will block forever.
When caching fragments, if we set the current playlist to main, then
it will always think it's a live stream (no endlist in it) so it will
force the redownload of the main playlist after every seek, which is
unnecessary. Also, it causes a race condition where a seek migh happen
during that redownload, and we'll think we're trying to seek a live pipeline.
Reduce the viewfinder queue limits to only allow it to store
one buffer, preventing the queue from holding old buffers for
too long. This also avoids showing slightly outdated frames on
the viewfinder when the source has already produced new ones
and improves the buffer recycling rate, important for sources
that use bufferpools.
first pause the task, then stop all fetchers, then stop the update thread
then pause the task again, since it might have been restarted by
another thread in the meantime
The reason is to let rtpdtmfmux drop buffers during the inter digit interval,
this way, there will be more silence around the DTMF tones so IVFs will have
a better chance recognizing them.
When removing the current program, it will get freed by the
hash table removal callback, so ensure we clear our pointer
to it.
Fixes a crash later on in gst_ts_demux_push trying to access it.
https://bugzilla.gnome.org/show_bug.cgi?id=656927
http://dvd.sourceforge.net/spu_notes does not mention that high bits
are to be masked, and not clearing them makes a sample work, where
clearing them yielded left > right.
History does not shed any light, as tracing this code's origin shows
the same bitmasks being there in 2007 when it was imported.
https://bugzilla.gnome.org/show_bug.cgi?id=620119
The task function uses GST_TASK_WAIT which does a g_cond_wait giving it
the GST_OBJECT_GET_LOCK of the task. The mutex gets locked when
g_cond_wait returns, so if we don't lock/unlock it, it will
stay locked forever, preventing the task from ever finishing.
We shouldn't lock the task object lock, so let's remove the GST_TASK_WAIT
and make the task pause instead if there are no buffers in the queue.
When a program is changed, stream_added is called which sets the
need_newsegment to TRUE, then stream_removed is called, which calls
the flush_pending_data, which checks for the newsegment and causes
it to send a new-segment.
We must not send the newsegment when flushing the pending data on the
removed stream. We should only push it when flushing data on the newly
added streams (after they finish parsing their PTS header)
If a program/stream is changed, then a newsegment is sent which must
not be the same as the base segment since it happens later. We must
shift the start position by the time elapsed since the newsegment
and the current PTS of the stream
By using a separate variable, first it allows us to sort the lists
of alternates but keep the pointer on the first occurence in the main
playlist (to respect the spec of starting with the bitrate specified
first in the main playlist). It also avoid playing with the lists variable
which should be used to store the list of playlists and not as a pointer
to the current one.
Also fixes a memleak with the g_list_foreach freeing the lists, if it wasn't
pointing to the first element of the list.
Basesrc derived classes send an eos when they change state
from paused to ready and that breaks video recordings on camerabin2
as it makes the whole audio branch pads flushing.
Prevent it by using a pad probe that only allows the eos to pass
when it is caused by a stop-capture action.
Capsfilters are created on the constructor and their properties can
be set/get from camerabin2's set/get_property functions. The user with
a broken setup would cause assertions when trying to set/get the
capture caps of this camerabin2.
A proper missing-plugin message will be posted when the user tries to
set camerabin2 to READY state.
GET_BITS is a macro for gst_bit_reader_get_bits_uint32, which cannot
read more than 32 bits and will fail in this case where it is called
to read 79 bits. Since we want to skip those bits, gst_bit_reader_skip
is more appropriate in this case.
Adds a property to add a custom GstElement to the audio
branch of the pipeline. This allows the user to do custom audio
processing/analysis when recording videos.
Use macros to simplyfy the shading code. Those will ease to add support for
other colorspaces in the future. Add more variants for the shading (left,right,
horiz-in, vert-out, vert-in).
camrabin2 connects a viewfinderbin on "vfsrc". viewfinderbin is made of:
vfbin-csp ! vfbin-videoscale ! videosink.
we should either remove csp/videoscale from wrappercamerabinsrc (as
done in this patch) or we should get rid of viewfinderbin altogether.
The use of this method was removed in:
commit 539f10f4d9
basecamerasrc: More cleanup
The code from wrappercamerabinsrc is from v4l2camerasrc but is unused:
get_allowed_input_caps is not called anywhere.
The audio source inside camerabin2 is put to READY and back to
PLAYING when starting capture, causing the pipeline to lose its
clock. As camerabin2 isn't put to PAUSED->PLAYING again during
this, a new clock isn't selected for elements.
A flags property has been added to encodebin to toggle whether the
conversion elements (ffmpegcolorspace, videoscale, audioconvert,
audioresample, audiorate) are created and linked into the appropriate
branches of encodebin.
Not including these elements avoids some slow caps negotiation and
allows the first buffers to flow through encodebin much more quickly.
However, it imposes that the uncompressed input is appropriate for the
target profile and elements selected to meet that profile.
If we bring the audio source up to the PAUSED state before emitting the
start-capture signal to the camera source, when subequently taking the
audio source to the PLAYING state, it will begin capture more quickly.
Since camerabin2 has switched to encodebin and encodebin has its own
queues and conversion elements, those preceding encodebin are no longer
necessary and as such can be removed.
Previously hlsdemux wasn't sending out any newsegment.
Here we push a GST_FORMAT_TIME newsegment, and whenever possible we
try to indicate the proper start time.
This allows downstream elements to relay the start/time values properly
to the sinks, allowing better stream switching.
The program_stopped vmethod was called before stream_removed vmethod
was being called. Since we only did stream-related operations in there,
we just remove the program_stopped vmethod and do everything in the
stream_removed one.
Also, make sure we flush out all pending data before sending EOS.
stream_type is stored as guint inside the GstStructure but was retreived
using valist with a pointer to guint16. This would cause stack gardening
when code is compiled without optimisation (e.g. in -O0 the compiler wont
pad the stack to optimise out required mask).
https://bugzilla.gnome.org/show_bug.cgi?id=655540
When switching bitrates, we might end up switching to a different
media-type (like from aac to/from mpeg-ts).
For this switch to behave properly in decodebin2, this patch adds:
* dynamic source pads (which will be added/removed whenever a stream
media type changes
* re-checking the fragment media type whenever we switch to a different
playlist
gstpcapparse.c: In function 'gst_pcap_parse_chain':
gstpcapparse.c:381:6: error: 'eth_type' may be used uninitialized in this function [-Werror=uninitialized]
gstpcapparse.c:354:11: note: 'eth_type' was declared here
The current code is not checking for ethernet type, as it's supposed to,
but link layer device type and it's hard-coded to only accept dumps from
ethernet (ARPHRD_ETHER; 1). We don't care where the dump was fetched
from (wlan, 3G, etc.)
What we care about is the that the ethernet type is IP (ETHERNET_IP;
0x800), which is clearly field 14:
http://www.tcpdump.org/pcap3_man.html
And do a bit of cleanup.
Signed-off-by: Felipe Contreras <felipe.contreras@nokia.com>
We first activate new streams before shutting down old ones.
We emit no-more-pads after we add new streams and emit EOS before
removing old ones.
Also cleanup/refactor a bit more of the code accordingly
Using a NULL string for location means that the application
doesn't want the image to be encoded, but wants to receive
the preview image. (Only works for image captures)
Useful for application that want the capture in memory only, like
displaying to the user before it choses to encode or take another
picture in avatar capturing scenarios.
https://bugzilla.gnome.org/show_bug.cgi?id=641918
We in fact get the size of the header (including stuffing bytes), therefore
use that instead of trying to skip 0xff bytes ourselves since some media
streams do start with 0xff (like mpeg audio's initial 0xfff).
That is, output timestamps can then either be the absolute capture time,
or the relative capture time (w.r.t. to first output buffer), or the relative
capture time incremented by some offset.
In mpegtsmux_choose_best_stream () call if the gst_collect_pads_pop () call
returns no buffer (NULL), the plugin SegFaults in the gst_buffer_unref call.
To fix this we check if a valid buffer is returned before calling
gst_buffer_unref ().
Fixes bug #654416.
Appears to be utterly incapable of parsing and decoding TTA streams.
Hasn't been updated to do TTA2. If you want this element to work,
fix the bloody thing. The gst-ffmpeg decoder works fine.
Also fixed an obvious endianness issue along the way.
Fixes: #652924
The default for tagsetters is to use merge keep mode, so tags
would never be replaced and all captures would have the same tags.
This commit watches all elements added into encodebin and sets
all tagsetters to merge replace mode
Using serialized custom events for switching image capture saving
location makes camerabin2 save each capture correctly to the location
that was set during the moment start-capture was called, and not
the moment the filesink was writing to disk.
This prevents captures to be overwriten by racyness among start-capture
and setting location for images.
We only need to change the state of the filesink to switch its
saving location. This might still cause some problems of dropping
captured buffers, but it is better than changing the state of
the whole branch.
buffer timestamps are converted to GstClockTime to cover pcr/pts wraps.
multiple pcr/pts wraps are handled with an index which ensures at most
a single pcr wraparound between two entries.
the last seen pcr is recorded to have a nearby index point for short seeks
resuming playback might be delayed if the postion is not a keyframe
TODO: replace manual packet scanning and parsing in the initial duration estimation
The incoming data has already been scanned in mpeg_packetizer_add_buf.
We can therefore stop scanning for picture data as soon as we've parsed
the header. Makes mpegvideoparse 2 times faster.
https://bugzilla.gnome.org/show_bug.cgi?id=648933
Camerabin2 allows setting a filter for image, video or viewfinder, but
not one filter for all three at the same time. I added a filter to
wrappercamerabinsrc to allow setting a global filter when using this
source.
https://bugzilla.gnome.org/show_bug.cgi?id=649822
Seriously faster. Algorithm is nearly the same as bilinear, which
given the speed of this code, should be considered the baseline of
quality. Speed appears to be limited by memory bandwidth, so I
didn't bother trying to make it any faster.
This element allows you to get information about buffers with bus messages. It
provides the same kind of information as identity does through a notify signal
on a string property, but in a more programmer-friendly way.
... by defaulting to allow splitting packetized input and having
negotiation with downstream deciding whether or not this applies.
Also enable pass-through parsing mode if input and output format
(stream-format and alignment) match.
API: GstH264Parse:split-packetized (removed)
Fixes#650228.
Rather than assert'ing in such case, emit warning if the length of a NAL unit
is less than expected 2 and discard it.
Based on patch by Benjamin M. Schwartz <bens@alum.mit.edu>
Fixes#650416.
