0dceefc5fa
Merge commit '9e500efdbe0deeff1602500ebc229a0a6b6bb1a2'
...
* commit '9e500efdbe0deeff1602500ebc229a0a6b6bb1a2':
Add av_image_check_sar() and use it to validate SAR
Conflicts:
libavcodec/dpx.c
libavcodec/dvdec.c
libavcodec/ffv1dec.c
libavcodec/utils.c
libavutil/version.h
Merged-by: Michael Niedermayer <michaelni@gmx.at>
2014-06-20 22:20:28 +02:00
9e500efdbe
Add av_image_check_sar() and use it to validate SAR
2014-06-20 10:39:33 -04:00
cc86158173
avcodec/ffv1dec: use av_malloc_array()
...
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2014-05-03 20:08:18 +02:00
fb0c9d41d6
avutil: remove timer.h include from internal.h
...
Added libavutil/timer.h include to all files with {START,STOP}_TIMER.
2014-01-25 21:50:20 +01:00
0e575c24d6
ffv1.4: use 2 coefficients for calculating the Y plane in the RCT
...
0-0.7% improved compression
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2013-12-10 03:16:58 +01:00
7854d2d251
avcodec/ffv1: support adjusting the g vs r + b coefficient in the RCT
...
about 1% better compression
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2013-12-09 00:37:38 +01:00
be1e6e7503
Merge remote-tracking branch 'qatar/master'
...
* qatar/master:
mpegvideo_enc: use the AVFrame API properly.
ffv1: use the AVFrame API properly.
jpegls: use the AVFrame API properly.
huffyuv: use the AVFrame API properly.
Conflicts:
libavcodec/ffv1.c
libavcodec/ffv1.h
libavcodec/ffv1dec.c
libavcodec/ffv1enc.c
Changes to ffv1 are more redone than merged due to them being based on
an ancient codebase and a good part of that having being done already
as well.
Merged-by: Michael Niedermayer <michaelni@gmx.at>
2013-11-17 13:55:50 +01:00
a6064b12b4
ffv1: use the AVFrame API properly.
2013-11-16 17:50:51 +01:00
a90905db2e
ffv1: Assume bitdepth 0 means 8bit
...
CC: libav-stable@libav.org
Reported-by: debian/726189
2013-10-15 23:58:20 +02:00
ee77140afa
Merge commit 'b2bed9325dbd6be0da1d91ffed3f513c40274fd2'
...
* commit 'b2bed9325dbd6be0da1d91ffed3f513c40274fd2':
cosmetics: Group .name and .long_name together in codec/format declarations
Conflicts:
libavcodec/8svx.c
libavcodec/alac.c
libavcodec/cljr.c
libavcodec/dnxhddec.c
libavcodec/dnxhdenc.c
libavcodec/dpxenc.c
libavcodec/dvdec.c
libavcodec/dvdsubdec.c
libavcodec/dvdsubenc.c
libavcodec/ffv1dec.c
libavcodec/flacdec.c
libavcodec/flvdec.c
libavcodec/fraps.c
libavcodec/frwu.c
libavcodec/g726.c
libavcodec/gif.c
libavcodec/gifdec.c
libavcodec/h261dec.c
libavcodec/h263dec.c
libavcodec/iff.c
libavcodec/imc.c
libavcodec/libopencore-amr.c
libavcodec/libopenjpegdec.c
libavcodec/libopenjpegenc.c
libavcodec/libspeexenc.c
libavcodec/libvo-amrwbenc.c
libavcodec/libvorbisenc.c
libavcodec/libvpxenc.c
libavcodec/libx264.c
libavcodec/libxavs.c
libavcodec/libxvid.c
libavcodec/ljpegenc.c
libavcodec/mjpegbdec.c
libavcodec/mjpegdec.c
libavcodec/mpeg12dec.c
libavcodec/mpeg4videodec.c
libavcodec/msmpeg4dec.c
libavcodec/pgssubdec.c
libavcodec/pngdec.c
libavcodec/pngenc.c
libavcodec/proresdec_lgpl.c
libavcodec/proresenc_kostya.c
libavcodec/ra144enc.c
libavcodec/rawdec.c
libavcodec/rv10.c
libavcodec/sp5xdec.c
libavcodec/takdec.c
libavcodec/tta.c
libavcodec/v210dec.c
libavcodec/vp6.c
libavcodec/wavpack.c
libavcodec/xbmenc.c
libavcodec/yop.c
Merged-by: Michael Niedermayer <michaelni@gmx.at>
2013-10-04 12:34:23 +02:00
b2bed9325d
cosmetics: Group .name and .long_name together in codec/format declarations
2013-10-03 23:32:01 +02:00
547c2f002a
Make decoding alpha optional for some codecs.
...
For codecs where decoding of a whole plane can simply
be skipped, we should offer applications to not decode
alpha for better performance (ca. 30% less CPU usage
and 40% reduced memory bandwidth).
It also means applications do not need to implement support
(even if it is rather simple) for YUVA formats in order to be
able to play these files.
Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>
2013-09-22 16:20:54 +02:00
d1a16564a2
avcodec/ffv1: YUVA(444,422,420) 9, 10 and 16 bit support
...
Signed-off-by: Paul B Mahol <onemda@gmail.com>
2013-09-09 19:49:37 +00:00
a27227d401
avcodec/ffv1dec: fix format detection
...
Fixes crash with carefuly designed files.
Signed-off-by: Paul B Mahol <onemda@gmail.com>
2013-09-09 19:49:01 +00:00
8393b80b7d
avcodec/ffv1dec: Support decoding planes as raw PCM in 1.4
...
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2013-09-09 20:19:28 +02:00
21dc3a3cc2
avcodec/ffv1dec: reorganize thread init/update
...
This moves some allocations to init, reducing possible failure modes in update.
Always copies from the previous context instead of just during init
Fixes Ticket2923
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2013-09-01 23:22:06 +02:00
c72cca5a44
avcodec/ffv1dec: move initial_states init to init_thread_copy()
...
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2013-09-01 23:22:06 +02:00
b05cd1ea7e
ffv1dec: Check bits_per_raw_sample and colorspace for equality in ver 0/1 headers
...
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2013-08-30 13:53:58 +02:00
547d690d67
ffv1dec: check that global parameters dont change in version 0/1
...
Such changes are not allowed nor supported
Fixes Ticket2906
Found-by: ami_stuff
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2013-08-30 05:27:51 +02:00
20b965a1a4
avcodec/ffv1dec: check global header version
...
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2013-08-30 03:43:49 +02:00
d9b0b54a5f
ffv1: rename minor to micro version
...
the version is 1.3.4 which makes 4 micro and not minor
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2013-08-20 03:30:36 +02:00
2c1a215ddb
ffv1: update years in header
...
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2013-08-17 01:43:30 +02:00
c387c45e83
ffv1: fix plane_count at version 1.4
...
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2013-08-15 13:03:53 +02:00
8ec6188263
ffv1dec: support printing information about the global header
...
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2013-08-15 12:58:48 +02:00
ae4c912bce
Forward interlaced field information from mov to ffv1 decoder.
...
Only read the information for old ffv1, level/version 3 saves
the information in the bitstream.
Fixes a part of ticket #2190 .
Signed-off-by: Carl Eugen Hoyos <cehoyos@ag.or.at>
2013-08-02 23:31:40 +02:00
61d900fd0d
lavc: add ONLY_IF_THREADS_ENABLED where it is missing
...
Signed-off-by: Paul B Mahol <onemda@gmail.com>
2013-06-06 20:17:36 +00:00
a3264b4ba1
ffv1dec: defuse membomb
...
Fixes Ticket2589
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2013-05-19 13:56:13 +02:00
e6c4ac7b5f
pixdesc: rename PIX_FMT_* flags to AV_PIX_FMT_FLAG_*
2013-05-15 07:46:51 +02:00
a0c0900e47
ffv1dec: Support frame threading with gop > 1
...
This is about 20-30% faster than slice threading
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2013-05-11 20:17:45 +02:00
69cfe63a43
ffv1: Switch to ThreadFrame
...
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2013-05-11 20:16:49 +02:00
570d63eef3
lavu: add FF_CEIL_RSHIFT and use it in various places.
2013-05-09 16:59:42 +02:00
d4868a960b
ffv1dec: remove redundant error message.
...
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2013-04-27 16:36:05 +02:00
ff0b4c08ca
ffv1dec: add code to support frame threading with gop=1 ffv1
...
CODEC_CAP_FRAME_THREADS is not added yet because that would
unconditionally enable it, breaking gop>1 files.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2013-04-27 16:20:42 +02:00
1a392fc550
ffv1: Store a flag in the global header that indicates if all frames are keyframes
...
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2013-04-27 16:17:29 +02:00
aa96439fae
lavc: remove unused put_bits.h headers
...
Signed-off-by: Paul B Mahol <onemda@gmail.com>
2013-04-24 23:17:09 +00:00
1ec94b0f06
lavc: factorize ff_{thread_,re,}get_buffer error messages.
...
Coccinelle profile used:
@@
expression r, ctx, f, loglevel, str, flags;
@@
-if ((r = ff_get_buffer(ctx, f, flags)) < 0) {
- av_log(ctx, loglevel, str);
- return r;
-}
+if ((r = ff_get_buffer(ctx, f, flags)) < 0)
+ return r;
@@
expression r, ctx, f, loglevel, str;
@@
-if ((r = ff_reget_buffer(ctx, f)) < 0) {
- av_log(ctx, loglevel, str);
- return r;
-}
+if ((r = ff_reget_buffer(ctx, f)) < 0)
+ return r;
@@
expression r, ctx, f, loglevel, str, flags;
@@
-if ((r = ff_thread_get_buffer(ctx, f, flags)) < 0) {
- av_log(ctx, loglevel, str);
- return r;
-}
+if ((r = ff_thread_get_buffer(ctx, f, flags)) < 0)
+ return r;
...along with some manual patches for the remaining ones.
2013-03-13 19:00:10 +01:00
80e9e63c94
Merge commit '759001c534287a96dc96d1e274665feb7059145d'
...
* commit '759001c534287a96dc96d1e274665feb7059145d':
lavc decoders: work with refcounted frames.
Anton Khirnov (1):
lavc decoders: work with refcounted frames.
Clément Bœsch (47):
lavc/ansi: reset file
lavc/ansi: re-do refcounted frame changes from Anton
fraps: reset file
lavc/fraps: switch to refcounted frames
gifdec: reset file
lavc/gifdec: switch to refcounted frames
dsicinav: resolve conflicts
smc: resolve conflicts
zmbv: resolve conflicts
rpza: resolve conflicts
vble: resolve conflicts
xxan: resolve conflicts
targa: resolve conflicts
vmnc: resolve conflicts
utvideodec: resolve conflicts
tscc: resolve conflicts
ulti: resolve conflicts
ffv1dec: resolve conflicts
dnxhddec: resolve conflicts
v210dec: resolve conflicts
vp3: resolve conflicts
vcr1: resolve conflicts
v210x: resolve conflicts
wavpack: resolve conflicts
pngdec: fix compilation
roqvideodec: resolve conflicts
pictordec: resolve conflicts
mdec: resolve conflicts
tiertexseqv: resolve conflicts
smacker: resolve conflicts
vb: resolve conflicts
vqavideo: resolve conflicts
xl: resolve conflicts
tmv: resolve conflicts
vmdav: resolve conflicts
truemotion1: resolve conflicts
truemotion2: resolve conflicts
lcldec: fix compilation
libcelt_dec: fix compilation
qdrw: fix compilation
r210dec: fix compilation
rl2: fix compilation
wnv1: fix compilation
yop: fix compilation
tiff: resolve conflicts
interplayvideo: fix compilation
qpeg: resolve conflicts (FIXME/TESTME).
Hendrik Leppkes (33):
012v: convert to refcounted frames
8bps: fix compilation
8svx: resolve conflicts
4xm: resolve conflicts
aasc: resolve conflicts
bfi: fix compilation
aura: fix compilation
alsdec: resolve conflicts
avrndec: convert to refcounted frames
avuidec: convert to refcounted frames
bintext: convert to refcounted frames
cavsdec: resolve conflicts
brender_pix: convert to refcounted frames
cinepak: resolve conflicts
cinepak: avoid using AVFrame struct directly in private context
cljr: fix compilation
cpia: convert to refcounted frames
cscd: resolve conflicts
iff: resolve conflicts and do proper conversion to refcounted frames
4xm: fix reference frame handling
cyuv: fix compilation
dxa: fix compilation
eacmv: fix compilation
eamad: fix compilation
eatgv: fix compilation
escape124: remove unused variable.
escape130: convert to refcounted frames
evrcdec: convert to refcounted frames
exr: convert to refcounted frames
mvcdec: convert to refcounted frames
paf: properly free the frame data on decode close
sgirle: convert to refcounted frames
lavfi/moviesrc: use refcounted frames
Michael Niedermayer (56):
Merge commit '759001c534287a96dc96d1e274665feb7059145d'
resolve conflicts in headers
motion_est: resolve conflict
mpeg4videodec: fix conflicts
dpcm conflict fix
dpx: fix conflicts
indeo3: resolve confilcts
kmvc: resolve conflicts
kmvc: resolve conflicts
h264: resolve conflicts
utils: resolve conflicts
rawdec: resolve conflcits
mpegvideo: resolve conflicts
svq1enc: resolve conflicts
mpegvideo: dont clear data, fix assertion failure on fate vsynth1 with threads
pthreads: resolve conflicts
frame_thread_encoder: simple compilefix not yet tested
snow: update to buffer refs
crytsalhd: fix compile
dirac: switch to new API
sonic: update to new API
svq1: resolve conflict, update to new API
ffwavesynth: update to new buffer API
g729: update to new API
indeo5: fix compile
j2kdec: update to new buffer API
linopencore-amr: fix compile
libvorbisdec: update to new API
loco: fix compile
paf: update to new API
proresdec: update to new API
vp56: update to new api / resolve conflicts
xface: convert to refcounted frames
xan: fix compile&fate
v408: update to ref counted buffers
v308: update to ref counted buffers
yuv4dec: update to ref counted buffers
y41p: update to ref counted frames
xbm: update to refcounted frames
targa_y216: update to refcounted buffers
qpeg: fix fate/crash
cdxl: fix fate
tscc: fix reget buffer useage
targa_y216dec: fix style
msmpeg4: fix fate
h264: ref_picture() copy fields that have been lost too
update_frame_pool: use channel field
h264: Put code that prevents deadlocks back
mpegvideo: dont allow last == current
wmalossless: fix buffer ref messup
ff_alloc_picture: free tables in case of dimension mismatches
h264: fix null pointer dereference and assertion failure
frame_thread_encoder: update to bufrefs
ec: fix used arrays
snowdec: fix off by 1 error in dimensions check
h264: disallow single unpaired fields as references of frames
Paul B Mahol (2):
lavc/vima: convert to refcounted frames
sanm: convert to refcounted frames
Conflicts:
libavcodec/4xm.c
libavcodec/8bps.c
libavcodec/8svx.c
libavcodec/aasc.c
libavcodec/alsdec.c
libavcodec/anm.c
libavcodec/ansi.c
libavcodec/avs.c
libavcodec/bethsoftvideo.c
libavcodec/bfi.c
libavcodec/c93.c
libavcodec/cavsdec.c
libavcodec/cdgraphics.c
libavcodec/cinepak.c
libavcodec/cljr.c
libavcodec/cscd.c
libavcodec/dnxhddec.c
libavcodec/dpcm.c
libavcodec/dpx.c
libavcodec/dsicinav.c
libavcodec/dvdec.c
libavcodec/dxa.c
libavcodec/eacmv.c
libavcodec/eamad.c
libavcodec/eatgq.c
libavcodec/eatgv.c
libavcodec/eatqi.c
libavcodec/error_resilience.c
libavcodec/escape124.c
libavcodec/ffv1.h
libavcodec/ffv1dec.c
libavcodec/flicvideo.c
libavcodec/fraps.c
libavcodec/frwu.c
libavcodec/g723_1.c
libavcodec/gifdec.c
libavcodec/h264.c
libavcodec/h264.h
libavcodec/h264_direct.c
libavcodec/h264_loopfilter.c
libavcodec/h264_refs.c
libavcodec/huffyuvdec.c
libavcodec/idcinvideo.c
libavcodec/iff.c
libavcodec/indeo2.c
libavcodec/indeo3.c
libavcodec/internal.h
libavcodec/interplayvideo.c
libavcodec/ivi_common.c
libavcodec/jvdec.c
libavcodec/kgv1dec.c
libavcodec/kmvc.c
libavcodec/lagarith.c
libavcodec/libopenjpegdec.c
libavcodec/mdec.c
libavcodec/mimic.c
libavcodec/mjpegbdec.c
libavcodec/mjpegdec.c
libavcodec/mmvideo.c
libavcodec/motion_est.c
libavcodec/motionpixels.c
libavcodec/mpc7.c
libavcodec/mpeg12.c
libavcodec/mpeg4videodec.c
libavcodec/mpegvideo.c
libavcodec/mpegvideo.h
libavcodec/msrle.c
libavcodec/msvideo1.c
libavcodec/nuv.c
libavcodec/options_table.h
libavcodec/pcx.c
libavcodec/pictordec.c
libavcodec/pngdec.c
libavcodec/pnmdec.c
libavcodec/pthread.c
libavcodec/qpeg.c
libavcodec/qtrle.c
libavcodec/r210dec.c
libavcodec/rawdec.c
libavcodec/roqvideodec.c
libavcodec/rpza.c
libavcodec/smacker.c
libavcodec/smc.c
libavcodec/svq1dec.c
libavcodec/svq1enc.c
libavcodec/targa.c
libavcodec/tiertexseqv.c
libavcodec/tiff.c
libavcodec/tmv.c
libavcodec/truemotion1.c
libavcodec/truemotion2.c
libavcodec/tscc.c
libavcodec/ulti.c
libavcodec/utils.c
libavcodec/utvideodec.c
libavcodec/v210dec.c
libavcodec/v210x.c
libavcodec/vb.c
libavcodec/vble.c
libavcodec/vcr1.c
libavcodec/vmdav.c
libavcodec/vmnc.c
libavcodec/vp3.c
libavcodec/vp56.c
libavcodec/vp56.h
libavcodec/vp6.c
libavcodec/vqavideo.c
libavcodec/wavpack.c
libavcodec/xl.c
libavcodec/xxan.c
libavcodec/zmbv.c
Merged-by: Michael Niedermayer <michaelni@gmx.at>
2013-03-12 03:23:28 +01:00
d243896987
ffv1: fix calculating slice dimensions for version 2
...
It got broken in 0f13cd3187
2013-03-08 08:10:02 +01:00
759001c534
lavc decoders: work with refcounted frames.
2013-03-08 07:38:30 +01:00
a984efd104
Merge commit 'c242bbd8b6939507a1a6fb64101b0553d92d303f'
...
* commit 'c242bbd8b6939507a1a6fb64101b0553d92d303f':
Remove unnecessary dsputil.h #includes
Conflicts:
libavcodec/ffv1.c
libavcodec/h261dec.c
libavcodec/h261enc.c
libavcodec/h264pred.c
libavcodec/lpc.h
libavcodec/mjpegdec.c
libavcodec/rectangle.h
libavcodec/x86/idct_sse2_xvid.c
Merged-by: Michael Niedermayer <michaelni@gmx.at>
2013-02-26 13:05:10 +01:00
c242bbd8b6
Remove unnecessary dsputil.h #includes
2013-02-26 00:51:34 +01:00
d27edc038a
Merge commit '511cf612ac979f536fd65e14603a87ca5ad435f3'
...
* commit '511cf612ac979f536fd65e14603a87ca5ad435f3':
miscellaneous typo fixes
Conflicts:
libavcodec/4xm.c
libavcodec/lagarith.c
libavcodec/parser.c
libavcodec/ratecontrol.c
libavcodec/shorten.c
libavcodec/vda_h264.c
libavformat/dvenc.c
libavformat/wtv.c
tools/patcheck
Merged-by: Michael Niedermayer <michaelni@gmx.at>
2012-12-21 17:32:52 +01:00
511cf612ac
miscellaneous typo fixes
2012-12-21 00:18:34 +01:00
fc1152de41
Merge commit 'df9b9567518f2840d79a4a96b447ebe1aa326408'
...
* commit 'df9b9567518f2840d79a4a96b447ebe1aa326408':
lavc: fix decode_frame() third parameter semantics for video decoders
Conflicts:
libavcodec/cscd.c
libavcodec/eamad.c
libavcodec/ffv1dec.c
libavcodec/gifdec.c
libavcodec/h264.c
libavcodec/iff.c
libavcodec/mjpegdec.c
libavcodec/pcx.c
libavcodec/vp56.c
Merged-by: Michael Niedermayer <michaelni@gmx.at>
2012-12-05 17:20:19 +01:00
874c5b02c4
Merge commit '594d4d5df3c70404168701dd5c90b7e6e5587793'
...
* commit '594d4d5df3c70404168701dd5c90b7e6e5587793':
lavc: add a wrapper for AVCodecContext.get_buffer().
Conflicts:
libavcodec/4xm.c
libavcodec/8svx.c
libavcodec/bmv.c
libavcodec/cljr.c
libavcodec/cscd.c
libavcodec/dnxhddec.c
libavcodec/dpcm.c
libavcodec/dpx.c
libavcodec/eacmv.c
libavcodec/eamad.c
libavcodec/frwu.c
libavcodec/g723_1.c
libavcodec/gifdec.c
libavcodec/idcinvideo.c
libavcodec/iff.c
libavcodec/indeo3.c
libavcodec/internal.h
libavcodec/interplayvideo.c
libavcodec/kmvc.c
libavcodec/mpc7.c
libavcodec/mpegaudiodec.c
libavcodec/pcx.c
libavcodec/pngdec.c
libavcodec/pnmdec.c
libavcodec/rl2.c
libavcodec/snow.c
libavcodec/targa.c
libavcodec/tscc.c
libavcodec/txd.c
libavcodec/utils.c
libavcodec/v210dec.c
libavcodec/vb.c
libavcodec/vmdav.c
libavcodec/vp56.c
libavcodec/vqavideo.c
libavcodec/wavpack.c
libavcodec/wnv1.c
libavcodec/xl.c
libavcodec/yop.c
Merged-by: Michael Niedermayer <michaelni@gmx.at>
2012-12-05 15:18:12 +01:00
df9b956751
lavc: fix decode_frame() third parameter semantics for video decoders
...
It's got_frame, not data size
2012-12-04 21:45:36 +01:00
594d4d5df3
lavc: add a wrapper for AVCodecContext.get_buffer().
...
It will be useful in the upcoming transition to refcounted AVFrames.
2012-12-04 21:41:59 +01:00
0560b28f12
ffv1dec: remove incorrect assert()
...
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2012-11-23 02:42:00 +01:00
fdfbb793c3
ffv1dec: propagate return code from ffv1_common_init()
...
Fixes Ticket1824
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2012-11-07 13:27:01 +01:00
dd11615bbc
ffv1dec: more completely check slice count
...
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2012-11-07 13:26:37 +01:00
Michael Niedermayer
Justin Ruggles
Janne Grunau
Anton Khirnov
Luca Barbato
Diego Biurrun
Reimar Döffinger
Paul B Mahol
Tim.Nicholson
Clément Bœsch