Justin Ruggles [Tue, 10 Jan 2012 13:48:23 +0000 (08:48 -0500)]
ipmovie: fix pts for CODEC_ID_INTERPLAY_DPCM
frame sample count calculation was incorrect
Justin Ruggles [Tue, 10 Jan 2012 14:24:21 +0000 (09:24 -0500)]
sierravmd: fix audio pts
The duration of the first packet was being calculated incorrectly, leading to
an incorrect timestamp offset.
Aneesh Dogra [Tue, 10 Jan 2012 18:08:03 +0000 (23:38 +0530)]
bethsoftvideo: Use bytestream2 functions to prevent buffer overreads.
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
Paul B Mahol [Tue, 10 Jan 2012 16:06:02 +0000 (16:06 +0000)]
bmpenc: support for PIX_FMT_RGB444
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
Ronald S. Bultje [Sun, 20 Nov 2011 23:54:15 +0000 (15:54 -0800)]
swscale: fix crash in fast_bilinear code when compiled with -mred-zone.
Additional comments from Måns Rullgard have been integrated
by Reinhard Tartler.
Signed-off-by: Reinhard Tartler <siretart@tauware.de>
Oka Motofumi [Tue, 10 Jan 2012 14:39:04 +0000 (06:39 -0800)]
swscale: specify register type.
Fixes a compilation failure on win64.
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
Janne Grunau [Mon, 9 Jan 2012 01:06:59 +0000 (02:06 +0100)]
rv34: use get_bits_left()
It is not necessary to store the bit stream length in a RV34DecContext
field.
Anton Khirnov [Mon, 2 Jan 2012 14:02:46 +0000 (15:02 +0100)]
avconv: reinitialize the filtergraph on resolution change.
This is a hopefully temporary solution until lavfi can properly deal
with resolution changes.
Anton Khirnov [Tue, 3 Jan 2012 10:18:00 +0000 (11:18 +0100)]
vsrc_buffer: error on changing frame parameters.
Anton Khirnov [Tue, 10 Jan 2012 08:13:32 +0000 (09:13 +0100)]
avconv: fix -copyinkf.
This option only applies to streamcopy, but is currently processed only
when encoding.
Martin Storsjö [Tue, 10 Jan 2012 14:37:40 +0000 (16:37 +0200)]
fate: Update file checksums after the mov muxer change in
a78dbada55d6
Signed-off-by: Martin Storsjö <martin@martin.st>
Martin Storsjö [Mon, 9 Jan 2012 16:35:01 +0000 (18:35 +0200)]
movenc: Don't store a nonzero creation time if nothing was set by the caller
If the creation time is stored in the file as a zero, the
mov demuxer skips exporting the creation time. Currently,
files muxed without a creation time get demuxed with a
Jan 1st 1970 creation timestamp.
Signed-off-by: Martin Storsjö <martin@martin.st>
Paul B Mahol [Mon, 9 Jan 2012 23:37:24 +0000 (23:37 +0000)]
bmpdec: support for rgb444 with bitfields compression
Do not display garbage for invalid/unsupported bitfields values.
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
Paul B Mahol [Tue, 10 Jan 2012 02:54:34 +0000 (02:54 +0000)]
rgb2rgb: allow conversion for <15 bpp
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
Luca Barbato [Sun, 8 Jan 2012 16:49:43 +0000 (17:49 +0100)]
doc: fix stray reference to FFmpeg
Luca Barbato [Sat, 7 Jan 2012 09:59:35 +0000 (10:59 +0100)]
v4l2: use C99 struct initializer
Remove some unneeded memsets.
Luca Barbato [Thu, 5 Jan 2012 11:17:45 +0000 (12:17 +0100)]
v4l2: poll the file descriptor
Instead of busy waiting use poll();
Luca Barbato [Wed, 4 Jan 2012 14:06:10 +0000 (15:06 +0100)]
v4l2: support compressed formats
Let pass the codec name to -pixel_format and introduce -input_format.
Laurentiu Ion [Tue, 10 Jan 2012 01:21:17 +0000 (03:21 +0200)]
kmvc: Use bytestream2 functions to prevent buffer overreads.
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
Gaurav Narula [Thu, 29 Dec 2011 21:20:22 +0000 (02:50 +0530)]
fate: Add tests for more AAC features.
al15_44 uses independent coupling.
al18_44 uses PNS (perceptual noise substitution).
am05_44 uses main prediction and independent coupling.
Signed-off-by: Alex Converse <alex.converse@gmail.com>
Alex Converse [Fri, 6 Jan 2012 22:49:11 +0000 (14:49 -0800)]
aacps: Add missing newline in error message.
Alex Converse [Fri, 6 Jan 2012 02:39:20 +0000 (18:39 -0800)]
fate: Add tests for vc1/wmapro in ism.
Alex Converse [Sat, 7 Jan 2012 01:23:49 +0000 (17:23 -0800)]
aacdec: Add a fate test for 5.1 channel SBR.
Alex Converse [Sat, 7 Jan 2012 01:22:45 +0000 (17:22 -0800)]
aacdec: Turn off PS for multichannel files that use PCE based configs.
Fixes al_sbr_cm_48_5.1.mp4.
Diego Biurrun [Sat, 7 Jan 2012 19:27:31 +0000 (20:27 +0100)]
cabac: remove put_cabac_u/ueg from cabac-test.
The functions are not used in any part of Libav, therefore testing them in the
cabac-test is unnecessary. Since this makes them unused, remove the functions.
Paul B Mahol [Mon, 9 Jan 2012 01:24:33 +0000 (01:24 +0000)]
swscale: RGB4444 and BGR444 input
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
Mike Melanson [Sun, 8 Jan 2012 03:59:07 +0000 (19:59 -0800)]
FATE: add test for xWMA demuxer.
(Does not attempt to decode percetual audio data inside.)
Code coverage: libavformat/xwma.c: 3% -> 75%
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
Mike Melanson [Sun, 8 Jan 2012 03:59:08 +0000 (19:59 -0800)]
FATE: add test for SMJPEG demuxer and associated IMA ADPCM audio decoder.
(Don't attempt to decode JPEG data.)
Code coverage: libavformat/smjpeg.c: 0% -> 69%
libavcodec/adpcm.c: 0% -> 10% (fresh run); 92.4% -> 93% following a FATE run
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
Vitor Sessak [Thu, 5 Jan 2012 19:26:33 +0000 (20:26 +0100)]
mpegaudiodec: optimized iMDCT transform
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
Vitor Sessak [Wed, 4 Jan 2012 20:43:47 +0000 (21:43 +0100)]
mpegaudiodec: change imdct window arrangment for better pointer alignment
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
Vitor Sessak [Wed, 4 Jan 2012 20:32:47 +0000 (21:32 +0100)]
mpegaudiodec: move imdct and windowing function to mpegaudiodsp
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
Vitor Sessak [Tue, 3 Jan 2012 20:40:57 +0000 (21:40 +0100)]
mpegaudiodec: interleave iMDCT buffer to simplify future SIMD implementations
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
Ronald S. Bultje [Mon, 9 Jan 2012 00:37:43 +0000 (16:37 -0800)]
swscale: convert yuy2/uyvy/nv12/nv21ToY/UV from inline asm to yasm.
Also implement SSE2/AVX variants.
Mike Melanson [Sun, 8 Jan 2012 03:59:09 +0000 (19:59 -0800)]
FATE: test to exercise WTV demuxer.
Does not attempt to decode perceptual codecs inside.
Code coverage: libavformat/wtv.c: 0% -> 71%
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
Daniel Huang [Sun, 8 Jan 2012 19:14:37 +0000 (13:14 -0600)]
mjpegdec: K&R formatting cosmetics
Signed-off-by: Diego Biurrun <diego@biurrun.de>
Diego Biurrun [Tue, 3 Jan 2012 11:20:59 +0000 (12:20 +0100)]
swscale: K&R formatting cosmetics for code examples
Diego Biurrun [Fri, 30 Dec 2011 17:37:16 +0000 (18:37 +0100)]
swscale: K&R reformatting cosmetics for header files
Mike Melanson [Sun, 8 Jan 2012 03:59:06 +0000 (19:59 -0800)]
FATE test: cvid-grayscale; ensures that the grayscale Cinepak variant is exercised.
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
Aneesh Dogra [Sun, 8 Jan 2012 19:57:58 +0000 (01:27 +0530)]
bfi: Use bytestream2 functions to prevent buffer overreads.
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
Laurentiu Ion [Sun, 8 Jan 2012 21:05:37 +0000 (23:05 +0200)]
dpcm: Fix invalid writes
Fixes bug: #152
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
Aneesh Dogra [Sun, 8 Jan 2012 19:19:46 +0000 (00:49 +0530)]
utvideo: frame multithreading.
>> time ./avconv -i file.avi -f null -
Before : real 0m7.784s
After : real 0m3.662s
Tested on a Intel Core i3 Processor (2 cores, 4 threads).
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
Chris Evans [Thu, 5 Jan 2012 20:25:41 +0000 (21:25 +0100)]
vorbis: An additional defense in the Vorbis codec.
Fixes Bug: #190
Chromium Bug: #100543
Related to CVE-2011-3893
Signed-off-by: Reinhard Tartler <siretart@tauware.de>
Reinhard Tartler [Thu, 5 Jan 2012 20:40:18 +0000 (21:40 +0100)]
vorbisdec: Fix decoding bug with channel handling
Fixes Bug: #191
Chromium Bug: #101458
CVE-2011-3895
Signed-off-by: Reinhard Tartler <siretart@tauware.de>
Diego Biurrun [Sat, 7 Jan 2012 19:46:09 +0000 (20:46 +0100)]
cabac: Move code only used within the CABAC test program into the test program.
Diego Biurrun [Sat, 7 Jan 2012 17:37:28 +0000 (18:37 +0100)]
vp56: Drop unnecessary cabac.h #include.
Diego Biurrun [Sat, 7 Jan 2012 20:36:31 +0000 (21:36 +0100)]
h264-test: Initialize AVCodecContext.av_class.
This fixes a segfault on startup.
Also remove a commented-out and completely unused variable.
Diego Biurrun [Sat, 7 Jan 2012 18:17:15 +0000 (19:17 +0100)]
build: Skip compiling network.h and rtsp.h if networking is not enabled.
rtsp.h relies on network.h and the latter conditionally defines fallback OS
structures that rely on configure tests, which are only run if networking
is enabled.
Diego Biurrun [Sat, 7 Jan 2012 18:07:42 +0000 (19:07 +0100)]
cosmetics: drop some pointless parentheses
Andrey Utkin [Sat, 7 Jan 2012 20:38:00 +0000 (22:38 +0200)]
Disable annoying warning without changing behavior
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
Diego Biurrun [Fri, 30 Dec 2011 22:14:14 +0000 (23:14 +0100)]
faq: Solutions for common problems with sample paths when running FATE.
Justin Ruggles [Sat, 7 Jan 2012 16:25:04 +0000 (11:25 -0500)]
avcodec: attempt to clarify the CODEC_CAP_DELAY documentation
Justin Ruggles [Sat, 31 Dec 2011 00:35:45 +0000 (19:35 -0500)]
avcodec: fix avcodec_encode_audio() documentation.
the previous documentation indicated how many bytes are read from the input,
not how many samples are read.
Mike Melanson [Sat, 7 Jan 2012 17:29:35 +0000 (09:29 -0800)]
FATE: xmv-demux test; exercise the XMV demuxer without decoding the perceptual codecs inside.
Code coverage:
libavformat/xmv.c: 3% -> 91%
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
Paul B Mahol [Sat, 7 Jan 2012 17:31:31 +0000 (17:31 +0000)]
vqf: recognize more metadata chunks
Do not create tags for non-char chunks.
Create readable tag for DSIZ chunk.
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
Mike Melanson [Sat, 7 Jan 2012 17:29:32 +0000 (09:29 -0800)]
FATE test: BMV demuxer and associated video and audio decoders.
Code coverage:
libavcodec/bmv.c: 0% -> 75%
libavformat/bmv.c: 0% -> 85%
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
Mike Melanson [Sat, 7 Jan 2012 17:29:34 +0000 (09:29 -0800)]
FATE: indeo4 video decoder test.
Code coverage:
libavcodec/indeo4.c: 0% -> 78%
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
Mike Melanson [Sat, 7 Jan 2012 17:29:33 +0000 (09:29 -0800)]
FATE: update xxan-wc4 test to a sample with more code coverage.
The previous sample used for this test only contained type 0 frames.
Replace it with a sample that also features type 1 frames.
Code coverage:
libavcodec/xxan.c: 72% -> 89%
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
Mike Melanson [Sat, 7 Jan 2012 17:29:30 +0000 (09:29 -0800)]
Change the recent h264_mp4toannexb bitstream filter test to output to an elementary stream rather than a program stream.
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
Justin Ruggles [Fri, 6 Jan 2012 21:01:07 +0000 (16:01 -0500)]
g722enc: validate AVCodecContext.trellis
Justin Ruggles [Fri, 6 Jan 2012 20:32:44 +0000 (15:32 -0500)]
g722enc: set frame_size, and also handle an odd number of input samples
The fate reference is updated because the previous test skipped a sample in
each encode() call due each input frame having an odd number of samples.
Justin Ruggles [Fri, 6 Jan 2012 04:34:09 +0000 (23:34 -0500)]
g722enc: split encoding into separate functions for trellis vs. no trellis
Vitor Sessak [Tue, 3 Jan 2012 20:25:59 +0000 (21:25 +0100)]
mpegaudiodec: Use clearer pointer math
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
Michael Niedermayer [Fri, 6 Jan 2012 16:34:22 +0000 (17:34 +0100)]
tta: Fix returned error code at EOF
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Signed-off-by: Justin Ruggles <justin.ruggles@gmail.com>
Michael Niedermayer [Fri, 6 Jan 2012 16:30:05 +0000 (17:30 +0100)]
tta: fix off be 1 error in the end detection.
Fixes use of uninitialized values.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Signed-off-by: Justin Ruggles <justin.ruggles@gmail.com>
Justin Ruggles [Fri, 6 Jan 2012 23:14:24 +0000 (18:14 -0500)]
tta: fix 24-bit decoding.
Decode to the correct output buffer.
Paul B Mahol [Fri, 6 Jan 2012 01:09:06 +0000 (03:09 +0200)]
ipmovie: Add param change side data if the video dimensions have changed
Signed-off-by: Martin Storsjö <martin@martin.st>
Paul B Mahol [Fri, 6 Jan 2012 01:07:31 +0000 (03:07 +0200)]
interplayvideo: Handle changed video dimensions on the fly
Signed-off-by: Martin Storsjö <martin@martin.st>
Martin Storsjö [Fri, 6 Jan 2012 01:06:25 +0000 (03:06 +0200)]
libavcodec: Handle param change side data in avcodec_decode_video2, too
Also call avcodec_set_dimensions on dimension param change packets.
Signed-off-by: Martin Storsjö <martin@martin.st>
Martin Storsjö [Fri, 6 Jan 2012 01:05:27 +0000 (03:05 +0200)]
libavcodec: Move apply_param_change up above avcodec_decode_video2
This is in preparation to calling it from avcodec_decode_video2.
Signed-off-by: Martin Storsjö <martin@martin.st>
Janne Grunau [Fri, 6 Jan 2012 00:21:36 +0000 (01:21 +0100)]
indeo3: check motion vectors for validity
Fixes null pointer dereferences in fuzzed files found by Oana Stratulat.
Signed-off-by: Janne Grunau <janne-libav@jannau.net>
Michael Niedermayer [Tue, 20 Dec 2011 21:06:35 +0000 (22:06 +0100)]
indeo5: Fix null pointer dereference.
Bug found by: Oana Stratulat
Signed-off-by: Janne Grunau <janne-libav@jannau.net>
Janne Grunau [Thu, 5 Jan 2012 21:12:35 +0000 (22:12 +0100)]
electronicarts: check bytes per sample for validity
Prevents division by zero.
Laurentiu Ion [Fri, 6 Jan 2012 18:42:00 +0000 (20:42 +0200)]
flicvideo: fix invalid reads
Prevent invalid reads using bytestream2 functions.
Fixes bug #126.
Signed-off-by: Justin Ruggles <justin.ruggles@gmail.com>
Chris Evans [Thu, 5 Jan 2012 20:25:41 +0000 (21:25 +0100)]
vorbis: Avoid some out-of-bounds reads
Fixes Bug: #190
Chromium Bug: #100543
Related to CVE-2011-3893
Signed-off-by: Reinhard Tartler <siretart@tauware.de>
Paul B Mahol [Fri, 6 Jan 2012 17:18:07 +0000 (17:18 +0000)]
vqf: add more known extensions
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
Diego Biurrun [Tue, 27 Dec 2011 10:37:31 +0000 (11:37 +0100)]
cabac: remove unused function renorm_cabac_decoder
Diego Biurrun [Fri, 6 Jan 2012 00:34:16 +0000 (01:34 +0100)]
h264: Only use symbols from the SVQ3 decoder under proper conditionals.
Fixes --disable-everything --enable-decoder=h264 --disable-optimizations.
Justin Ruggles [Thu, 22 Dec 2011 03:32:04 +0000 (22:32 -0500)]
add bytestream2_tell() and bytestream2_seek() functions
Janne Grunau [Thu, 5 Jan 2012 23:17:37 +0000 (00:17 +0100)]
parsers: initialize MpegEncContext.slice_context_count to 1
The mpeg4 video, H264 and VC-1 parser hold (directly or indirectly)
a MpegEncContext in their private context. Since they do not call the
common mpegvideo init function slice_context_count has explicitly set
to 1.
Prevents a null pointer dereference in the h264 parser and fixes
bug 193.
Anssi Hannula [Fri, 30 Dec 2011 20:48:18 +0000 (22:48 +0200)]
spdifenc: use special alignment for DTS-HD length_code
Align IEC 61937 length_code for DTS-HD so that
(length_code & 0xf) == 0x8. This is reportedly needed with some
receivers.
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
Janne Grunau [Thu, 5 Jan 2012 20:57:22 +0000 (21:57 +0100)]
ipmovie: do not read audio packets before the codec is known
Prevents a division by zero.
Janne Grunau [Thu, 5 Jan 2012 20:28:03 +0000 (21:28 +0100)]
truemotion2: check size before GetBitContext initialisation
Prevents null ptr derefence for negative sizes.
Martin Storsjö [Fri, 30 Dec 2011 09:43:10 +0000 (11:43 +0200)]
avio: Only do implicit network initialization for network protocols
The implicit network initialization is set to be removed in the
future, but is kept for compatibility. By not doing the implicit
initialization for non-network protocols, we avoid the warning
about avformat_network_init() not being called for these, where
it really doesn't make much sense.
Signed-off-by: Martin Storsjö <martin@martin.st>
Martin Storsjö [Fri, 30 Dec 2011 09:38:05 +0000 (11:38 +0200)]
avio: Add an URLProtocol flag for indicating that a protocol uses network
This definition is in two files, since the definitions will move
to the private header at the next bump.
Signed-off-by: Martin Storsjö <martin@martin.st>
Janne Grunau [Thu, 5 Jan 2012 19:50:55 +0000 (20:50 +0100)]
adpcm: ADPCM Electronic Arts has always two channels
Chris Evans [Thu, 5 Jan 2012 20:19:30 +0000 (21:19 +0100)]
matroskadec: Fix a bug where a pointer was cached to an array that might later move due to a realloc()
Fixes bug #190
Chromium bug #100492
related to CVE-2011-3893
Signed-off-by: Reinhard Tartler <siretart@tauware.de>
Alex Converse [Thu, 5 Jan 2012 19:14:23 +0000 (11:14 -0800)]
fate: Add missing reference file from
9b4767e4.
Alex Converse [Thu, 5 Jan 2012 01:42:15 +0000 (17:42 -0800)]
mov: Support MOV_CH_LAYOUT_USE_DESCRIPTIONS for labeled descriptions.
Aneesh Dogra [Wed, 4 Jan 2012 19:58:21 +0000 (01:28 +0530)]
4xm: Prevent buffer overreads.
4xm decoder while decoding i2 frames can overread the buffer if proper checks
are not made.
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
Janne Grunau [Thu, 5 Jan 2012 02:47:21 +0000 (03:47 +0100)]
mjpegdec: parse RSTn to prevent skipping other data in mjpeg_decode_scan
Check explicitly if enough bits are left to prevent an infinite loop
when the bitstream buffer is not followed by zero-padding.
Based on patches by Michael Niedermayer <michaelni@gmx.at>.
Janne Grunau [Tue, 3 Jan 2012 12:56:42 +0000 (13:56 +0100)]
vp3: add fate test for non-zero last coefficient
Janne Grunau [Tue, 3 Jan 2012 12:38:01 +0000 (13:38 +0100)]
vp3: fix streams with non-zero last coefficient
Fixes a regression introduced in
8b94df0f2047e972.
Ronald S. Bultje [Thu, 5 Jan 2012 03:48:02 +0000 (19:48 -0800)]
swscale: remove unused U/V arguments from yuv2rgb_write().
Also document the function somewhat.
Diego Biurrun [Tue, 3 Jan 2012 13:52:02 +0000 (14:52 +0100)]
timer: K&R formatting cosmetics
Anton Khirnov [Thu, 5 Jan 2012 09:16:41 +0000 (10:16 +0100)]
lavf: cosmetics, reformat av_read_frame().
Anton Khirnov [Thu, 5 Jan 2012 09:14:07 +0000 (10:14 +0100)]
lavf: refactor av_read_frame() to make it easier to understand.
Oana Stratulat [Wed, 4 Jan 2012 23:08:05 +0000 (01:08 +0200)]
Report an error if pitch_lag is zero in AMR-NB decoder.
This fixes an infinite loop in the decoder on specially
crafted files, and fixes bug 151.
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
Ronald S. Bultje [Thu, 5 Jan 2012 05:27:31 +0000 (21:27 -0800)]
Revert "4xm: Prevent buffer overreads."
This reverts commit
295a7c0238e84b0ffa8f21ed938d45f51f54a4cd. The
patch breaks decoding of regular files (e.g. fate-4xm-2).
Aneesh Dogra [Wed, 4 Jan 2012 19:58:21 +0000 (01:28 +0530)]
4xm: Prevent buffer overreads.
4xm decoder while decoding i2 frames can overread the buffer if proper checks
are not made.
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
Aneesh Dogra [Wed, 4 Jan 2012 18:40:01 +0000 (00:10 +0530)]
4xm: pass the correct remaining buffer size to decode_i2_frame().
frame_size is the number of bytes left in the packet, so if we are passing
buf-4 we can safely read frame_size+4 bytes.
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>