lavc: add teletext decoder using libzvbi
Based on a patch by Wolfram Gloger <wmglo@dent.med.uni-muenchen.de>. http://lists.ffmpeg.org/pipermail/ffmpeg-devel/2012-December/136677.html The original patch was rebased by Tudor SUCIU <tudor.suciu@gmail.com>. Lots of additional features and fixes are made by me. Fixes ticket #2086. Changes since last version: - change default page to all pages Signed-off-by: Marton Balint <cus@passwd.hu> Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Marton Balint
Michael Niedermayer
parent
cf94299448
commit
b339dccbba
8 changed files with 537 additions and 1 deletions
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@ -15,6 +15,7 @@ version <next>
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data read from an input file
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data read from an input file
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- incomplete Voxware MetaSound decoder
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- incomplete Voxware MetaSound decoder
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- read EXIF metadata from JPEG
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- read EXIF metadata from JPEG
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- DVB teletext decoder
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version 2.0:
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version 2.0:
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6
configure
vendored
6
configure
vendored
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@ -242,6 +242,7 @@ External library support:
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--enable-libxvid enable Xvid encoding via xvidcore,
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--enable-libxvid enable Xvid encoding via xvidcore,
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native MPEG-4/Xvid encoder exists [no]
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native MPEG-4/Xvid encoder exists [no]
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--enable-libzmq enable message passing via libzmq [no]
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--enable-libzmq enable message passing via libzmq [no]
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--enable-libzvbi enable teletext support via libzvbi [no]
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--enable-openal enable OpenAL 1.1 capture support [no]
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--enable-openal enable OpenAL 1.1 capture support [no]
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--enable-opencl enable OpenCL code
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--enable-opencl enable OpenCL code
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--enable-openssl enable openssl [no]
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--enable-openssl enable openssl [no]
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@ -1205,6 +1206,7 @@ EXTERNAL_LIBRARY_LIST="
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libxavs
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libxavs
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libxvid
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libxvid
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libzmq
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libzmq
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libzvbi
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openal
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openal
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opencl
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opencl
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openssl
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openssl
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@ -2044,6 +2046,7 @@ libxavs_encoder_deps="libxavs"
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libxvid_encoder_deps="libxvid"
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libxvid_encoder_deps="libxvid"
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libutvideo_decoder_deps="libutvideo"
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libutvideo_decoder_deps="libutvideo"
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libutvideo_encoder_deps="libutvideo"
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libutvideo_encoder_deps="libutvideo"
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libzvbi_teletext_decoder_deps="libzvbi"
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# demuxers / muxers
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# demuxers / muxers
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ac3_demuxer_select="ac3_parser"
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ac3_demuxer_select="ac3_parser"
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@ -3767,6 +3770,7 @@ die_license_disabled gpl libvidstab
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die_license_disabled gpl libx264
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die_license_disabled gpl libx264
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die_license_disabled gpl libxavs
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die_license_disabled gpl libxavs
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die_license_disabled gpl libxvid
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die_license_disabled gpl libxvid
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die_license_disabled gpl libzvbi
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die_license_disabled gpl x11grab
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die_license_disabled gpl x11grab
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die_license_disabled nonfree libaacplus
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die_license_disabled nonfree libaacplus
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@ -4245,6 +4249,7 @@ enabled libx264 && require libx264 x264.h x264_encoder_encode -lx264 &
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enabled libxavs && require libxavs xavs.h xavs_encoder_encode -lxavs
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enabled libxavs && require libxavs xavs.h xavs_encoder_encode -lxavs
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enabled libxvid && require libxvid xvid.h xvid_global -lxvidcore
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enabled libxvid && require libxvid xvid.h xvid_global -lxvidcore
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enabled libzmq && require_pkg_config libzmq zmq.h zmq_ctx_new
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enabled libzmq && require_pkg_config libzmq zmq.h zmq_ctx_new
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enabled libzvbi && require libzvbi libzvbi.h vbi_decoder_new -lzvbi
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enabled openal && { { for al_libs in "${OPENAL_LIBS}" "-lopenal" "-lOpenAL32"; do
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enabled openal && { { for al_libs in "${OPENAL_LIBS}" "-lopenal" "-lOpenAL32"; do
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check_lib 'AL/al.h' alGetError "${al_libs}" && break; done } ||
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check_lib 'AL/al.h' alGetError "${al_libs}" && break; done } ||
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die "ERROR: openal not found"; } &&
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die "ERROR: openal not found"; } &&
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@ -4635,6 +4640,7 @@ echo "threading support ${thread_type-no}"
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echo "safe bitstream reader ${safe_bitstream_reader-no}"
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echo "safe bitstream reader ${safe_bitstream_reader-no}"
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echo "SDL support ${sdl-no}"
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echo "SDL support ${sdl-no}"
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echo "opencl enabled ${opencl-no}"
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echo "opencl enabled ${opencl-no}"
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echo "libzvbi enabled ${libzvbi-no}"
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echo "texi2html enabled ${texi2html-no}"
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echo "texi2html enabled ${texi2html-no}"
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echo "perl enabled ${perl-no}"
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echo "perl enabled ${perl-no}"
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echo "pod2man enabled ${pod2man-no}"
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echo "pod2man enabled ${pod2man-no}"
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@ -158,4 +158,45 @@ ee450d, 101010, eaeaea, 0ce60b, ec14ed, ebff0b, 0d617a, 7b7b7b, d1d1d1,
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7b2a0e, 0d950c, 0f007b, cf0dec, cfa80c, 7c127b}.
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7b2a0e, 0d950c, 0f007b, cf0dec, cfa80c, 7c127b}.
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@end table
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@end table
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@section libzvbi-teletext
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Libzvbi allows libavcodec to decode DVB teletext pages and DVB teletext
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subtitles. Requires the presence of the libzvbi headers and library during
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configuration. You need to explicitly configure the build with
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@code{--enable-libzvbi}.
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@subsection Options
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@table @option
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@item txt_page
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List of teletext page numbers to decode. You may use the special * string to
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match all pages. Pages that do not match the specified list are dropped.
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Default value is *.
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@item txt_chop_top
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Discards the top teletext line. Default value is 1.
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@item txt_format
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Specifies the format of the decoded subtitles. The teletext decoder is capable
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of decoding the teletext pages to bitmaps or to simple text, you should use
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"bitmap" for teletext pages, because certain graphics and colors cannot be
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expressed in simple text. You might use "text" for teletext based subtitles if
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your application can handle simple text based subtitles. Default value is
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bitmap.
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@item txt_left
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X offset of generated bitmaps, default is 0.
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@item txt_top
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Y offset of generated bitmaps, default is 0.
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@item txt_chop_spaces
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Chops leading and trailing spaces and removes empty lines from the generated
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text. This option is useful for teletext based subtitles where empty spaces may
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be present at the start or at the end of the lines or empty lines may be
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present between the subtitle lines because of double-sized teletext charactes.
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Default value is 1.
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@item txt_duration
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Sets the display duration of the decoded teletext pages or subtitles in
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miliseconds. Default value is 30000 which is 30 seconds.
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@item txt_transparent
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Force transparent background of the generated teletext bitmaps. Default value
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is 0 which means an opaque (black) background.
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@end table
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@c man end SUBTILES DECODERS
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@c man end SUBTILES DECODERS
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@ -133,6 +133,20 @@ Go to @url{https://github.com/dekkers/libilbc} and follow the instructions for
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installing the library. Then pass @code{--enable-libilbc} to configure to
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installing the library. Then pass @code{--enable-libilbc} to configure to
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enable it.
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enable it.
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@section libzvbi
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libzvbi is a VBI decoding library which can be used by FFmpeg to decode DVB
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teletext pages and DVB teletext subtitles.
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Go to @url{http://sourceforge.net/projects/zapping/} and follow the instructions for
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installing the library. Then pass @code{--enable-libzvbi} to configure to
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enable it.
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@float NOTE
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libzvbi is licensed under the GNU General Public License Version 2 or later
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(see @url{http://www.gnu.org/licenses/old-licenses/gpl-2.0.html} for details),
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you must upgrade FFmpeg's license to GPL in order to use it.
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@end float
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@chapter Supported File Formats, Codecs or Features
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@chapter Supported File Formats, Codecs or Features
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@ -947,6 +961,7 @@ performance on systems without hardware floating point support).
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@item 3GPP Timed Text @tab @tab @tab X @tab X
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@item 3GPP Timed Text @tab @tab @tab X @tab X
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@item AQTitle @tab @tab X @tab @tab X
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@item AQTitle @tab @tab X @tab @tab X
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@item DVB @tab X @tab X @tab X @tab X
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@item DVB @tab X @tab X @tab X @tab X
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@item DVB teletext @tab @tab X @tab @tab E
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@item DVD @tab X @tab X @tab X @tab X
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@item DVD @tab X @tab X @tab X @tab X
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@item JACOsub @tab X @tab X @tab @tab X
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@item JACOsub @tab X @tab X @tab @tab X
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@item MicroDVD @tab X @tab X @tab @tab X
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@item MicroDVD @tab X @tab X @tab @tab X
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@ -969,6 +984,8 @@ performance on systems without hardware floating point support).
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@code{X} means that the feature is supported.
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@code{X} means that the feature is supported.
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@code{E} means that support is provided through an external library.
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@section Network Protocols
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@section Network Protocols
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@multitable @columnfractions .4 .1
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@multitable @columnfractions .4 .1
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@ -727,6 +727,7 @@ OBJS-$(CONFIG_LIBWAVPACK_ENCODER) += libwavpackenc.o
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OBJS-$(CONFIG_LIBX264_ENCODER) += libx264.o
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OBJS-$(CONFIG_LIBX264_ENCODER) += libx264.o
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OBJS-$(CONFIG_LIBXAVS_ENCODER) += libxavs.o
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OBJS-$(CONFIG_LIBXAVS_ENCODER) += libxavs.o
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OBJS-$(CONFIG_LIBXVID_ENCODER) += libxvid.o
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OBJS-$(CONFIG_LIBXVID_ENCODER) += libxvid.o
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OBJS-$(CONFIG_LIBZVBI_TELETEXT_DECODER) += libzvbi-teletextdec.o
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# parsers
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# parsers
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OBJS-$(CONFIG_AAC_PARSER) += aac_parser.o aac_ac3_parser.o \
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OBJS-$(CONFIG_AAC_PARSER) += aac_parser.o aac_ac3_parser.o \
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@ -505,6 +505,7 @@ void avcodec_register_all(void)
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REGISTER_ENCODER(LIBX264RGB, libx264rgb);
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REGISTER_ENCODER(LIBX264RGB, libx264rgb);
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REGISTER_ENCODER(LIBXAVS, libxavs);
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REGISTER_ENCODER(LIBXAVS, libxavs);
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REGISTER_ENCODER(LIBXVID, libxvid);
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REGISTER_ENCODER(LIBXVID, libxvid);
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REGISTER_DECODER(LIBZVBI_TELETEXT, libzvbi_teletext);
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REGISTER_ENCODER(LIBAACPLUS, libaacplus);
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REGISTER_ENCODER(LIBAACPLUS, libaacplus);
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/* text */
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/* text */
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469
libavcodec/libzvbi-teletextdec.c
Normal file
469
libavcodec/libzvbi-teletextdec.c
Normal file
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@ -0,0 +1,469 @@
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/*
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* Teletext decoding for ffmpeg
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* Copyright (c) 2005-2010, 2012 Wolfram Gloger
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* Copyright (c) 2013 Marton Balint
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "avcodec.h"
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#include "libavutil/opt.h"
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#include "libavutil/intreadwrite.h"
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#include <libzvbi.h>
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#define TEXT_MAXSZ (25 * (56 + 1) * 4 + 2)
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#define VBI_NB_COLORS 40
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#define RGBA(r,g,b,a) (((a) << 24) | ((r) << 16) | ((g) << 8) | (b))
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#define VBI_R(rgba) (((rgba) >> 0) & 0xFF)
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#define VBI_G(rgba) (((rgba) >> 8) & 0xFF)
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#define VBI_B(rgba) (((rgba) >> 16) & 0xFF)
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#define VBI_A(rgba) (((rgba) >> 24) & 0xFF)
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/* main data structure */
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typedef struct TeletextContext
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{
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AVClass *class;
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char *pgno;
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int x_offset;
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int y_offset;
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char *format;
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int format_id; /* 0 = bitmap, 1 = text */
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int chop_top;
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int sub_duration; /* in msec */
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int transparent_bg;
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int chop_spaces;
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int lines_processed;
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AVSubtitleRect *sub_rect;
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vbi_decoder * vbi;
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vbi_dvb_demux * dx;
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#ifdef DEBUG
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vbi_export * ex;
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#endif
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/* Don't even _think_ about making sliced stack-local! */
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vbi_sliced sliced[64];
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} TeletextContext;
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/************************************************************************/
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static int
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chop_spaces_utf8(const unsigned char* t, int len)
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{
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t += len;
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while (len > 0) {
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if (*--t != ' ' || (len-1 > 0 && *(t-1) & 0x80))
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break;
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--len;
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}
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return len;
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}
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// draw a page as text
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static int
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gen_sub_text(TeletextContext *ctx, vbi_page *page, int chop_top)
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{
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AVSubtitleRect *sub_rect = ctx->sub_rect;
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char *text;
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const char *in;
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char *out;
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char *vbi_text = av_malloc(TEXT_MAXSZ);
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int sz;
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if (!vbi_text)
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return AVERROR(ENOMEM);
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sz = vbi_print_page_region(page, vbi_text, TEXT_MAXSZ-1, "UTF-8",
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/*table mode*/ TRUE, FALSE,
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0, chop_top,
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page->columns, page->rows-chop_top);
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if (sz <= 0) {
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av_log(ctx, AV_LOG_ERROR, "vbi_print error\n");
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av_free(vbi_text);
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return AVERROR_EXTERNAL;
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}
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vbi_text[sz] = '\0';
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in = vbi_text;
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out = text = av_malloc(TEXT_MAXSZ);
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if (!text) {
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av_free(vbi_text);
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return AVERROR(ENOMEM);
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}
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if (ctx->chop_spaces) {
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for (;;) {
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int nl, sz;
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// skip leading spaces and newlines
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in += strspn(in, " \n");
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// compute end of row
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for (nl = 0; in[nl]; ++nl)
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if (in[nl] == '\n' && (nl==0 || !(in[nl-1] & 0x80)))
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break;
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if (!in[nl])
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break;
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// skip trailing spaces
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sz = chop_spaces_utf8(in, nl);
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memcpy(out, in, sz);
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out += sz;
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*out++ = '\n';
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in += nl;
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}
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} else {
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strcpy(text, vbi_text);
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out += sz;
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*out++ = '\n';
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}
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av_free(vbi_text);
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*out = '\0';
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if (out > text) {
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sub_rect->type = SUBTITLE_TEXT;
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sub_rect->text = text;
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av_log(ctx, AV_LOG_DEBUG, "subtext:%s:txetbus\n", text);
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} else {
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sub_rect->type = SUBTITLE_NONE;
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av_free(text);
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}
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return 0;
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}
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static void
|
||||||
|
fix_transparency(TeletextContext *ctx, vbi_page *page, int chop_top, uint8_t transparent_color, int resx, int resy)
|
||||||
|
{
|
||||||
|
AVSubtitleRect *sub_rect = ctx->sub_rect;
|
||||||
|
int iy;
|
||||||
|
|
||||||
|
// Hack for transparency, inspired by VLC code...
|
||||||
|
for (iy = 0; iy < resy; iy++) {
|
||||||
|
uint8_t *pixel = sub_rect->pict.data[0] + iy * sub_rect->pict.linesize[0];
|
||||||
|
vbi_char *vc = page->text + (iy / 10 + chop_top) * page->columns;
|
||||||
|
vbi_char *vcnext = vc + page->columns;
|
||||||
|
for (; vc < vcnext; vc++) {
|
||||||
|
uint8_t *pixelnext = pixel + 12;
|
||||||
|
switch (vc->opacity) {
|
||||||
|
case VBI_TRANSPARENT_SPACE:
|
||||||
|
memset(pixel, transparent_color, 12);
|
||||||
|
break;
|
||||||
|
case VBI_OPAQUE:
|
||||||
|
case VBI_SEMI_TRANSPARENT:
|
||||||
|
if (!ctx->transparent_bg)
|
||||||
|
break;
|
||||||
|
case VBI_TRANSPARENT_FULL:
|
||||||
|
for(; pixel < pixelnext; pixel++)
|
||||||
|
if (*pixel == vc->background)
|
||||||
|
*pixel = transparent_color;
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
pixel = pixelnext;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
// draw a page as bitmap
|
||||||
|
static int
|
||||||
|
gen_sub_bitmap(TeletextContext *ctx, vbi_page *page, int chop_top)
|
||||||
|
{
|
||||||
|
AVSubtitleRect *sub_rect = ctx->sub_rect;
|
||||||
|
int resx = page->columns * 12;
|
||||||
|
int resy = (page->rows - chop_top) * 10;
|
||||||
|
uint8_t ci, cmax = 0;
|
||||||
|
int ret;
|
||||||
|
vbi_char *vc = page->text + (chop_top * page->columns);
|
||||||
|
vbi_char *vcend = page->text + (page->rows * page->columns);
|
||||||
|
|
||||||
|
for (; vc < vcend; vc++) {
|
||||||
|
if (vc->opacity != VBI_TRANSPARENT_SPACE) {
|
||||||
|
cmax = VBI_NB_COLORS;
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
if (cmax == 0) {
|
||||||
|
av_log(ctx, AV_LOG_DEBUG, "dropping empty page %3x\n", page->pgno);
|
||||||
|
sub_rect->type = SUBTITLE_NONE;
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
if ((ret = avpicture_alloc(&sub_rect->pict, AV_PIX_FMT_PAL8, resx, resy)) < 0)
|
||||||
|
return ret;
|
||||||
|
// Yes, we want to allocate the palette on our own because AVSubtitle works this way
|
||||||
|
sub_rect->pict.data[1] = NULL;
|
||||||
|
|
||||||
|
vbi_draw_vt_page_region(page, VBI_PIXFMT_PAL8,
|
||||||
|
sub_rect->pict.data[0], sub_rect->pict.linesize[0],
|
||||||
|
0, chop_top, page->columns, page->rows - chop_top,
|
||||||
|
/*reveal*/ 1, /*flash*/ 1);
|
||||||
|
|
||||||
|
fix_transparency(ctx, page, chop_top, cmax, resx, resy);
|
||||||
|
sub_rect->x = ctx->x_offset;
|
||||||
|
sub_rect->y = ctx->y_offset;
|
||||||
|
sub_rect->w = resx;
|
||||||
|
sub_rect->h = resy;
|
||||||
|
sub_rect->nb_colors = (int)cmax + 1;
|
||||||
|
sub_rect->pict.data[1] = av_mallocz(AVPALETTE_SIZE);
|
||||||
|
if (!sub_rect->pict.data[1]) {
|
||||||
|
av_freep(&sub_rect->pict.data[0]);
|
||||||
|
return AVERROR(ENOMEM);
|
||||||
|
}
|
||||||
|
for (ci = 0; ci < cmax; ci++) {
|
||||||
|
int r, g, b, a;
|
||||||
|
|
||||||
|
r = VBI_R(page->color_map[ci]);
|
||||||
|
g = VBI_G(page->color_map[ci]);
|
||||||
|
b = VBI_B(page->color_map[ci]);
|
||||||
|
a = VBI_A(page->color_map[ci]);
|
||||||
|
((uint32_t *)sub_rect->pict.data[1])[ci] = RGBA(r, g, b, a);
|
||||||
|
#ifdef DEBUG
|
||||||
|
av_log(ctx, AV_LOG_DEBUG, "palette %0x\n",
|
||||||
|
((uint32_t *)sub_rect->pict.data[1])[ci]);
|
||||||
|
#endif
|
||||||
|
}
|
||||||
|
((uint32_t *)sub_rect->pict.data[1])[cmax] = RGBA(0, 0, 0, 0);
|
||||||
|
sub_rect->type = SUBTITLE_BITMAP;
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
static void
|
||||||
|
handler(vbi_event *ev, void *user_data)
|
||||||
|
{
|
||||||
|
TeletextContext *ctx = user_data;
|
||||||
|
vbi_page page;
|
||||||
|
int res;
|
||||||
|
char pgno_str[12];
|
||||||
|
vbi_subno subno;
|
||||||
|
vbi_page_type vpt;
|
||||||
|
int chop_top;
|
||||||
|
char *lang;
|
||||||
|
|
||||||
|
snprintf(pgno_str, sizeof pgno_str, "%03x", ev->ev.ttx_page.pgno);
|
||||||
|
av_log(ctx, AV_LOG_DEBUG, "decoded page %s.%02x\n",
|
||||||
|
pgno_str, ev->ev.ttx_page.subno & 0xFF);
|
||||||
|
|
||||||
|
if (strcmp(ctx->pgno, "*") && !strstr(ctx->pgno, pgno_str))
|
||||||
|
return;
|
||||||
|
|
||||||
|
/* Fetch the page. */
|
||||||
|
res = vbi_fetch_vt_page(ctx->vbi, &page,
|
||||||
|
ev->ev.ttx_page.pgno,
|
||||||
|
ev->ev.ttx_page.subno,
|
||||||
|
VBI_WST_LEVEL_3p5, 25, TRUE);
|
||||||
|
|
||||||
|
if (!res)
|
||||||
|
return;
|
||||||
|
|
||||||
|
#ifdef DEBUG
|
||||||
|
fprintf(stderr, "\nSaving res=%d dy0=%d dy1=%d...\n",
|
||||||
|
res, page.dirty.y0, page.dirty.y1);
|
||||||
|
fflush(stderr);
|
||||||
|
|
||||||
|
if (!vbi_export_stdio(ctx->ex, stderr, &page))
|
||||||
|
fprintf(stderr, "failed: %s\n", vbi_export_errstr(ctx->ex));
|
||||||
|
#endif
|
||||||
|
|
||||||
|
vpt = vbi_classify_page(ctx->vbi, ev->ev.ttx_page.pgno, &subno, &lang);
|
||||||
|
chop_top = ctx->chop_top ||
|
||||||
|
((page.rows > 1) && (vpt == VBI_SUBTITLE_PAGE));
|
||||||
|
|
||||||
|
av_log(ctx, AV_LOG_DEBUG, "%d x %d page chop:%d\n",
|
||||||
|
page.columns, page.rows, chop_top);
|
||||||
|
|
||||||
|
if (!ctx->sub_rect) {
|
||||||
|
ctx->sub_rect = av_mallocz(sizeof(*ctx->sub_rect));
|
||||||
|
if (ctx->sub_rect) {
|
||||||
|
res = (ctx->format_id == 0) ?
|
||||||
|
gen_sub_bitmap(ctx, &page, chop_top) :
|
||||||
|
gen_sub_text (ctx, &page, chop_top);
|
||||||
|
if (res)
|
||||||
|
av_freep(&ctx->sub_rect);
|
||||||
|
}
|
||||||
|
} else {
|
||||||
|
// FIXME: Multiple teletext pages in a single packet, some kind of buffering should be done instead of dropping the page...
|
||||||
|
av_log(ctx, AV_LOG_WARNING, "Missed page %s.%02x.\n", pgno_str, ev->ev.ttx_page.subno & 0xFF);
|
||||||
|
}
|
||||||
|
|
||||||
|
vbi_unref_page(&page);
|
||||||
|
}
|
||||||
|
|
||||||
|
static int
|
||||||
|
teletext_decode_frame(AVCodecContext *avctx,
|
||||||
|
void *data, int *data_size,
|
||||||
|
AVPacket *pkt)
|
||||||
|
{
|
||||||
|
TeletextContext *ctx = avctx->priv_data;
|
||||||
|
AVSubtitle *sub = data;
|
||||||
|
const uint8_t *buf = pkt->data;
|
||||||
|
unsigned int left = pkt->size;
|
||||||
|
uint8_t pesheader[45] = {0x00, 0x00, 0x01, 0xbd, 0x00, 0x00, 0x85, 0x80, 0x24, 0x21, 0x00, 0x01, 0x00, 0x01};
|
||||||
|
int pesheader_size = sizeof(pesheader);
|
||||||
|
const uint8_t *pesheader_buf = pesheader;
|
||||||
|
|
||||||
|
if (!ctx->vbi) {
|
||||||
|
if (!(ctx->vbi = vbi_decoder_new()))
|
||||||
|
return AVERROR(ENOMEM);
|
||||||
|
if (!vbi_event_handler_add(ctx->vbi, VBI_EVENT_TTX_PAGE, handler, ctx)) {
|
||||||
|
vbi_decoder_delete(ctx->vbi);
|
||||||
|
ctx->vbi = NULL;
|
||||||
|
return AVERROR(ENOMEM);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
if (!ctx->dx && (!(ctx->dx = vbi_dvb_pes_demux_new (/* callback */ NULL, NULL))))
|
||||||
|
return AVERROR(ENOMEM);
|
||||||
|
|
||||||
|
// We allow unreasonably big packets, even if the standard only allows a max size of 1472
|
||||||
|
if ((pesheader_size + left) < 184 || (pesheader_size + left) > 65504 || (pesheader_size + left) % 184 != 0)
|
||||||
|
return AVERROR_INVALIDDATA;
|
||||||
|
|
||||||
|
memset(pesheader + 14, 0xff, pesheader_size - 14);
|
||||||
|
AV_WB16(pesheader + 4, left + pesheader_size - 6);
|
||||||
|
|
||||||
|
/* PTS is deliberately left as 0 in the PES header, otherwise libzvbi uses
|
||||||
|
* it to detect dropped frames. Unforunatey the guessed packet PTS values
|
||||||
|
* (see mpegts demuxer) are not accurate enough to pass that test. */
|
||||||
|
vbi_dvb_demux_cor(ctx->dx, ctx->sliced, 64, NULL, &pesheader_buf, &pesheader_size);
|
||||||
|
|
||||||
|
while (left > 0) {
|
||||||
|
int64_t pts = 0;
|
||||||
|
unsigned int lines = vbi_dvb_demux_cor(ctx->dx, ctx->sliced, 64, &pts, &buf, &left);
|
||||||
|
#ifdef DEBUG
|
||||||
|
av_log(avctx, AV_LOG_DEBUG,
|
||||||
|
"ctx=%p buf_size=%d left=%u lines=%u pts=%f pkt_pts=%f\n",
|
||||||
|
ctx, pkt->size, left, lines, (double)pts/90000.0, (double)pkt->pts/90000.0);
|
||||||
|
#endif
|
||||||
|
if (lines > 0) {
|
||||||
|
#ifdef DEBUGx
|
||||||
|
int i;
|
||||||
|
for(i=0; i<lines; ++i)
|
||||||
|
av_log(avctx, AV_LOG_DEBUG,
|
||||||
|
"lines=%d id=%x\n", i, ctx->sliced[i].id);
|
||||||
|
#endif
|
||||||
|
vbi_decode(ctx->vbi, ctx->sliced, lines, (double)pts/90000.0);
|
||||||
|
ctx->lines_processed += lines;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
// is there a subtitle to pass?
|
||||||
|
if (ctx->sub_rect) {
|
||||||
|
sub->format = (ctx->sub_rect->type == SUBTITLE_TEXT ? 1: 0);
|
||||||
|
sub->start_display_time = 0;
|
||||||
|
sub->end_display_time = ctx->sub_duration;
|
||||||
|
sub->num_rects = 0;
|
||||||
|
|
||||||
|
if (ctx->sub_rect->type != SUBTITLE_NONE) {
|
||||||
|
sub->rects = av_malloc(sizeof(*sub->rects) * 1);
|
||||||
|
if (sub->rects) {
|
||||||
|
sub->num_rects = 1;
|
||||||
|
sub->rects[0] = ctx->sub_rect;
|
||||||
|
}
|
||||||
|
} else {
|
||||||
|
av_log(avctx, AV_LOG_DEBUG, "sending empty sub\n");
|
||||||
|
sub->rects = NULL;
|
||||||
|
}
|
||||||
|
if (!sub->rects) // no rect was passed
|
||||||
|
av_free(ctx->sub_rect);
|
||||||
|
ctx->sub_rect = NULL;
|
||||||
|
|
||||||
|
*data_size = 1;
|
||||||
|
} else
|
||||||
|
*data_size = 0;
|
||||||
|
|
||||||
|
return pkt->size;
|
||||||
|
}
|
||||||
|
|
||||||
|
static int teletext_init_decoder(AVCodecContext *avctx)
|
||||||
|
{
|
||||||
|
TeletextContext *ctx = avctx->priv_data;
|
||||||
|
unsigned int maj, min, rev;
|
||||||
|
|
||||||
|
vbi_version(&maj, &min, &rev);
|
||||||
|
if (!(maj > 0 || min > 2 || min == 2 && rev >= 26)) {
|
||||||
|
av_log(avctx, AV_LOG_ERROR, "decoder needs zvbi version >= 0.2.26.\n");
|
||||||
|
return AVERROR_EXTERNAL;
|
||||||
|
}
|
||||||
|
|
||||||
|
ctx->dx = NULL;
|
||||||
|
ctx->vbi = NULL;
|
||||||
|
ctx->sub_rect = NULL;
|
||||||
|
if (!strcmp(ctx->format, "bitmap")) {
|
||||||
|
ctx->format_id = 0;
|
||||||
|
} else if (!strcmp(ctx->format, "text")) {
|
||||||
|
ctx->format_id = 1;
|
||||||
|
} else {
|
||||||
|
av_log(avctx, AV_LOG_ERROR, "unkown format %s\n", ctx->format);
|
||||||
|
return AVERROR_OPTION_NOT_FOUND;
|
||||||
|
}
|
||||||
|
|
||||||
|
#ifdef DEBUG
|
||||||
|
{
|
||||||
|
char *t;
|
||||||
|
ctx->ex = vbi_export_new("text", &t);
|
||||||
|
}
|
||||||
|
#endif
|
||||||
|
av_log(avctx, AV_LOG_VERBOSE, "page filter: %s\n", ctx->pgno);
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
static int teletext_close_decoder(AVCodecContext *avctx)
|
||||||
|
{
|
||||||
|
TeletextContext *ctx = avctx->priv_data;
|
||||||
|
|
||||||
|
#ifdef DEBUG
|
||||||
|
av_log(avctx, AV_LOG_DEBUG, "lines_total=%u\n", ctx->lines_processed);
|
||||||
|
#endif
|
||||||
|
|
||||||
|
vbi_dvb_demux_delete(ctx->dx);
|
||||||
|
vbi_decoder_delete(ctx->vbi);
|
||||||
|
ctx->dx = NULL;
|
||||||
|
ctx->vbi = NULL;
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
static void teletext_flush(AVCodecContext *avctx)
|
||||||
|
{
|
||||||
|
teletext_close_decoder(avctx);
|
||||||
|
}
|
||||||
|
|
||||||
|
#define OFFSET(x) offsetof(TeletextContext, x)
|
||||||
|
#define SD AV_OPT_FLAG_SUBTITLE_PARAM | AV_OPT_FLAG_DECODING_PARAM
|
||||||
|
static const AVOption options[] = {
|
||||||
|
{"txt_page", "list of teletext page numbers to decode, * is all", OFFSET(pgno), AV_OPT_TYPE_STRING, {.str = "*"}, 0, 0, SD},
|
||||||
|
{"txt_chop_top", "discards the top teletext line", OFFSET(chop_top), AV_OPT_TYPE_INT, {.i64 = 1}, 0, 1, SD},
|
||||||
|
{"txt_format", "format of the subtitles (bitmap or text)", OFFSET(format), AV_OPT_TYPE_STRING, {.str = "bitmap"}, 0, 0, SD},
|
||||||
|
{"txt_left", "x offset of generated bitmaps", OFFSET(x_offset), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 65535, SD},
|
||||||
|
{"txt_top", "y offset of generated bitmaps", OFFSET(y_offset), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 65535, SD},
|
||||||
|
{"txt_chop_spaces", "chops leading and trailing spaces from text", OFFSET(chop_spaces), AV_OPT_TYPE_INT, {.i64 = 1}, 0, 1, SD},
|
||||||
|
{"txt_duration", "display duration of teletext pages in msecs", OFFSET(sub_duration), AV_OPT_TYPE_INT, {.i64 = 30000}, 0, 86400000, SD},
|
||||||
|
{"txt_transparent", "force transparent background of the teletext", OFFSET(transparent_bg), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, SD},
|
||||||
|
{ NULL },
|
||||||
|
};
|
||||||
|
|
||||||
|
static const AVClass teletext_class = {
|
||||||
|
.class_name = "libzvbi_teletextdec",
|
||||||
|
.item_name = av_default_item_name,
|
||||||
|
.option = options,
|
||||||
|
.version = LIBAVUTIL_VERSION_INT,
|
||||||
|
};
|
||||||
|
|
||||||
|
AVCodec ff_libzvbi_teletext_decoder = {
|
||||||
|
.name = "libzvbi_teletextdec",
|
||||||
|
.type = AVMEDIA_TYPE_SUBTITLE,
|
||||||
|
.id = CODEC_ID_DVB_TELETEXT,
|
||||||
|
.priv_data_size = sizeof(TeletextContext),
|
||||||
|
.init = teletext_init_decoder,
|
||||||
|
.close = teletext_close_decoder,
|
||||||
|
.decode = teletext_decode_frame,
|
||||||
|
.flush = teletext_flush,
|
||||||
|
.long_name = NULL_IF_CONFIG_SMALL("Libzvbi DVB teletext decoder"),
|
||||||
|
.priv_class= &teletext_class,
|
||||||
|
};
|
||||||
|
|
@ -29,7 +29,7 @@
|
||||||
#include "libavutil/avutil.h"
|
#include "libavutil/avutil.h"
|
||||||
|
|
||||||
#define LIBAVCODEC_VERSION_MAJOR 55
|
#define LIBAVCODEC_VERSION_MAJOR 55
|
||||||
#define LIBAVCODEC_VERSION_MINOR 30
|
#define LIBAVCODEC_VERSION_MINOR 31
|
||||||
#define LIBAVCODEC_VERSION_MICRO 100
|
#define LIBAVCODEC_VERSION_MICRO 100
|
||||||
|
|
||||||
#define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
|
#define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
|
||||||
|
|
|
||||||
Loading…
Add table
Add a link
Reference in a new issue