It does not change anything for the existing filters and makes
better code fatrorization when future code will use the utility
functions.

Unlike av_frame_is_writable(), it uses the link's alloc callback,
making direct rendering possible.

The code comes from ff_filter_frame_framed(), moved with mostly
trivial changes.

Also introduce libavfilter/filters.h for all functions needed
to implement filters.

av_buffersink_get_frame_rate() did already exist; its argument becomes const.

The names are only used for technical output and debugging.
Make them similar to C identifiers for easier quick reading
of debug dumps.

start_number option starts the playlist sequence number
(#EXT-X-MEDIA-SEQUENCE) from the specified number. Unless hls_flags
single_file is set, it also specifies starting sequence numbers of
segment and subtitle filenames. Sometimes it is usefull to have unique
starting numbers at each run, but currently it is only achiveable by
setting this parameter manually.
This patch enables to specify start_number source parameter by
introducing hls_start_number_source with 3 possible values:
generic/epoch/datetime. This ensures to set start sequence number
automatically for practically unique numbers. Generic option is the
default and this is the curent behaviour: start_number option value
specifies the start sequence number. (start_number default value is 0)
If hls_start_number_source is set to epoch, then the start number will
be the seconds since epoch (1970-01-01 00:00:00). If set to datetime,
then the start sequence number will be based on the current date/time
value as YYYYmmddHHMMSS. e.g. 20161231235659.
Hls speficication allows 64 bit integers as sequence numbers. This patch
also changes some code where only 32 bit integer values were handled
correctly.
Reviewed-by: Moritz Barsnick <barsnick@gmx.net>
Signed-off-by: Bela Bodecs <bodecsb@vivanet.hu>
Signed-off-by: Steven Liu <lq@chinaffmpeg.org>

Signed-off-by: James Almer <jamrial@gmail.com>

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Reason: For some cases, such as 2 or more graphics cards existing, the
default command line may fail because ffmpeg does not open the correct
device node:
    ffmpeg -hwaccel qsv -c:v h264_qsv -i test.264 -c:v h264_qsv out.264
Let user choose the proper one by running like below:
    ffmpeg -hwaccel qsv -qsv_device /dev/dri/renderD128 -c:v h264_qsv \
-i test.264 -c:v h264_qsv out.264
Signed-off-by: ChaoX A Liu <chaox.a.liu@gmail.com>
Signed-off-by: Huang, Zhengxu <zhengxu.maxwell@gmail.com>
Signed-off-by: Andrew, Zhang <huazh407@gmail.com>
Signed-off-by: Mark Thompson <sw@jkqxz.net>

Fixes ticket #6072.

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>

This decoder can decode all existing SpeedHQ formats (SHQ0–5, 7, and 9),
including correct decoding of the alpha channel.

1080p is decoded in 142 fps on one core of my i7-4600U (2.1 GHz Haswell),
about evenly split between bitstream reader and IDCT. There is currently
no attempt at slice or frame threading, even though the format trivially
supports both.

NewTek very helpfully provided a full set of SHQ samples, as well as
source code for an SHQ2 encoder (not included) and assistance with
understanding some details of the format.

Allows more codecs than mpeg12video to make use of it.

Mainly useful for supporting decoding of headerless files.
Signed-off-by: Paul B Mahol <onemda@gmail.com>

Signed-off-by: Paul B Mahol <onemda@gmail.com>

CID: 1324298
add a label when error goto the label to release resource
Signed-off-by: Steven Liu <lq@chinaffmpeg.org>

Fixes ticket #6044

Based on patch by Carl Eugen Hoyos

This is what gimp, ImageMagick and FreeImage do and what the
Adobe Photoshop file format specification suggests.
Fixes a sample from ticket #6045.

Reviewed-by: Martin Vignali

when the segments largest duration value is look like 4.000000, the
EXT-X-TARGETDURATION value should equ 4.
it's wrong when hlsenc use ceil, so fix it.
Signed-off-by: Steven Liu <lq@chinaffmpeg.org>

 problem

fix ticket: #6067

Tested-by: Pero
Signed-off-by: Steven Liu <lq@chinaffmpeg.org>