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Anssi Hannula [Fri, 21 Jan 2011 22:58:55 +0000 (22:58 +0000)]
dca: add profile names
Signed-off-by: Mans Rullgard <mans@mansr.com>
Justin Ruggles [Fri, 21 Jan 2011 21:59:19 +0000 (21:59 +0000)]
iir: Change dst param to float* in ff_iir_filter_flt().
Signed-off-by: Mans Rullgard <mans@mansr.com>
Anssi Hannula [Fri, 21 Jan 2011 20:00:40 +0000 (20:00 +0000)]
dca: consider a stream with XXCh/X96 in ExSS as DTS-HD HRA
DTS-HD HRA streams do not always have an XBR extension in the extension
substream. Instead they can have only XXCh and X96 extensions in
there and still be considered DTS-HD HRA.
This is also confirmed with Onkyo TX-SR607 receiver which recognizes
such a stream as HiRes Audio.
Signed-off-by: Mans Rullgard <mans@mansr.com>
Anton Khirnov [Fri, 21 Jan 2011 18:18:09 +0000 (18:18 +0000)]
mp3enc: add support for writing UTF-16 tags
Also it gets rid of some mysterious magic numbers in code.
Signed-off-by: Mans Rullgard <mans@mansr.com>
Mans Rullgard [Fri, 21 Jan 2011 21:35:08 +0000 (21:35 +0000)]
Fix libavformat version extraction in configure
This fixes shared library builds broken by
50196a982bf7c8be9b41053fa0975473c217e709
Signed-off-by: Mans Rullgard <mans@mansr.com>
Mans Rullgard [Fri, 21 Jan 2011 19:58:23 +0000 (19:58 +0000)]
configure: better test for mktemp
Some variants of mktemp require a template, so provide one when
checking for the command. We already supply a template in the
subsequent uses of mktemp.
Thanks to Michael Kostylev.
Signed-off-by: Mans Rullgard <mans@mansr.com>
Mans Rullgard [Fri, 21 Jan 2011 19:05:07 +0000 (19:05 +0000)]
configure: simplify exit traps
This does the same thing and also fixes the trapping in
some (possibly broken) shells.
Suggested by Michael Kostylev.
Signed-off-by: Mans Rullgard <mans@mansr.com>
Anton Khirnov [Fri, 21 Jan 2011 19:18:08 +0000 (19:18 +0000)]
lavf: move ff_put_str16_nolen from asf to avio and rename it
It will be useful in the mp3 muxer.
Signed-off-by: Mans Rullgard <mans@mansr.com>
Anton Khirnov [Fri, 21 Jan 2011 19:18:07 +0000 (19:18 +0000)]
avio: add av_put_str and deprecate put_strz in favor of it
Signed-off-by: Mans Rullgard <mans@mansr.com>
Justin Ruggles [Fri, 21 Jan 2011 00:12:18 +0000 (00:12 +0000)]
cosmetics related to LPC changes.
Signed-off-by: Mans Rullgard <mans@mansr.com>
Justin Ruggles [Fri, 21 Jan 2011 00:12:03 +0000 (00:12 +0000)]
Separate window function from autocorrelation.
Signed-off-by: Mans Rullgard <mans@mansr.com>
Justin Ruggles [Fri, 21 Jan 2011 00:11:44 +0000 (00:11 +0000)]
Move lpc_compute_autocorr() from DSPContext to a new struct LPCContext.
Signed-off-by: Mans Rullgard <mans@mansr.com>
Anton Khirnov [Fri, 21 Jan 2011 19:18:06 +0000 (19:18 +0000)]
lavf: move the version macros to a new header
Signed-off-by: Mans Rullgard <mans@mansr.com>
Anton Khirnov [Wed, 19 Jan 2011 09:13:25 +0000 (10:13 +0100)]
id3v2: use an enum for encodings instead of magic numbers.
Signed-off-by: Mans Rullgard <mans@mansr.com>
Mans Rullgard [Fri, 21 Jan 2011 18:12:17 +0000 (18:12 +0000)]
Make demuxers auto-select parsers they need
This makes configure --disable-everything --enable-demuxer=foo
work as expected.
Signed-off-by: Mans Rullgard <mans@mansr.com>
Mans Rullgard [Thu, 20 Jan 2011 02:04:19 +0000 (02:04 +0000)]
Makefile: simplify setting of some variables
Signed-off-by: Mans Rullgard <mans@mansr.com>
Anton Khirnov [Fri, 21 Jan 2011 13:53:46 +0000 (13:53 +0000)]
Split mp3 demuxer and muxer into separate files.
Signed-off-by: Mans Rullgard <mans@mansr.com>
Mans Rullgard [Fri, 21 Jan 2011 00:09:31 +0000 (00:09 +0000)]
dca: pretty-print some tables
Signed-off-by: Mans Rullgard <mans@mansr.com>
Justin Ruggles [Thu, 20 Jan 2011 21:59:23 +0000 (21:59 +0000)]
iir: change filter type if/else to a switch.
Simplifies error handling and makes it easier to add additional filter types.
Signed-off-by: Mans Rullgard <mans@mansr.com>
Justin Ruggles [Thu, 20 Jan 2011 21:26:47 +0000 (21:26 +0000)]
Add biquad high-pass and low-pass IIR filters.
Signed-off-by: Mans Rullgard <mans@mansr.com>
Ronald S. Bultje [Thu, 20 Jan 2011 22:24:19 +0000 (17:24 -0500)]
Ronald S. Bultje [Thu, 20 Jan 2011 19:00:34 +0000 (14:00 -0500)]
Set gray (128) U/V planes for chroma-less samples. Fixes two fate samples
when played with -flags emu_edge.
Justin Ruggles [Thu, 20 Jan 2011 19:06:15 +0000 (19:06 +0000)]
Split out Butterworth filter coeff init to a separate function.
Signed-off-by: Mans Rullgard <mans@mansr.com>
Justin Ruggles [Thu, 20 Jan 2011 18:28:17 +0000 (18:28 +0000)]
cosmetics: vertical alignment and line wrap
Signed-off-by: Mans Rullgard <mans@mansr.com>
Justin Ruggles [Thu, 20 Jan 2011 18:28:16 +0000 (18:28 +0000)]
Add memory allocation failure checks to ff_iir_filter_init_coeffs().
Signed-off-by: Mans Rullgard <mans@mansr.com>
Mans Rullgard [Thu, 20 Jan 2011 17:52:13 +0000 (17:52 +0000)]
Make PNG test depend on PNG codec
Signed-off-by: Mans Rullgard <mans@mansr.com>
Justin Ruggles [Thu, 20 Jan 2011 17:04:58 +0000 (17:04 +0000)]
cosmetics: wrap long line
Signed-off-by: Mans Rullgard <mans@mansr.com>
Justin Ruggles [Thu, 20 Jan 2011 17:24:06 +0000 (17:24 +0000)]
Add function ff_iir_filter_flt() to accept floating-point input and output.
Signed-off-by: Mans Rullgard <mans@mansr.com>
Janne Grunau [Thu, 20 Jan 2011 14:03:47 +0000 (15:03 +0100)]
mpegtsenc: prefer metadata keyed with "service_name"
title metadata is only used as fallback if no service_name is available.
Signed-off-by: Janne Grunau <janne-ffmpeg@jannau.net>
Georgi Chorbadzhiyski [Thu, 20 Jan 2011 13:24:53 +0000 (15:24 +0200)]
Set service_provider and service_name in mpegts demuxer
Set service_provider and service_name in mpegts demuxer, previously
name and provider_name were set but since the muxer uses service_provider
and service_name use them.
Signed-off-by: Mans Rullgard <mans@mansr.com>
Anton Khirnov [Thu, 20 Jan 2011 08:06:58 +0000 (09:06 +0100)]
id3v2: don't overwrite existing tags
Apparently some broken taggers prepend a new ID3v2 tag leaving the
existing one intact. Our parser currently reads all tags and overwrites
existing values with supposedly outdated ones.
fixes issue2419
Signed-off-by: Mans Rullgard <mans@mansr.com>
Anton Khirnov [Thu, 20 Jan 2011 08:35:59 +0000 (08:35 +0000)]
id3v2: convert metadata after all the tags were read
Signed-off-by: Mans Rullgard <mans@mansr.com>
Anton Khirnov [Thu, 20 Jan 2011 08:35:58 +0000 (08:35 +0000)]
id3v2: make ff_id3v2_parse static
Signed-off-by: Mans Rullgard <mans@mansr.com>
Georgi Chorbadzhiyski [Thu, 20 Jan 2011 08:04:45 +0000 (10:04 +0200)]
libavcodec minor version is > 99 so fix the formating
libavcodec minor version is > 99 so when printing the library versions
the output is a little bit broken:
libavutil 50. 36. 0 / 50.36. 0
libavcore 0. 16. 1 / 0.16. 1
libavcodec 52.108. 0 / 52.108. 0
libavformat 52. 94. 0 / 52.94. 0
libavdevice 52. 2. 3 / 52. 2. 3
libavfilter 1. 74. 0 / 1.74. 0
libswscale 0. 12. 0 / 0.12. 0
Change the formating to look like this:
libavutil 50. 36. 0 / 50. 36. 0
libavcore 0. 16. 1 / 0. 16. 1
libavcodec 52.108. 0 / 52.108. 0
libavformat 52. 94. 0 / 52. 94. 0
libavdevice 52. 2. 3 / 52. 2. 3
libavfilter 1. 74. 0 / 1. 74. 0
libswscale 0. 12. 0 / 0. 12. 0
Signed-off-by: Mans Rullgard <mans@mansr.com>
Georgi Chorbadzhiyski [Thu, 20 Jan 2011 07:26:40 +0000 (09:26 +0200)]
Add service_provider and service_name metadata
This patch adds support in mpegts muxer for using service_provider and
service_name metadata to set service_provider_name and service_name
fields in SDT.
Example usage:
ffmpeg -i file.ts -f mpegts -re -acodec copy -vcodec copy -f mpegts \
-metadata service_provider="Some provider" \
-metadata service_name="Some Channel" \
"udp://239.0.70.2:5000?pkt_size=1316&ttl=1"
Signed-off-by: Mans Rullgard <mans@mansr.com>
Ronald S. Bultje [Thu, 20 Jan 2011 01:30:18 +0000 (20:30 -0500)]
Fix horizontal/horizontal_up 8x8l intra prediction x86/simd functions.
The original functions did not work correctly for edge pixels, e.g.
when CODEC_FLAG_EMU_EDGE is set, leading to corrupt output in e.g. VLC.
Based on a patch by Daniel Kang <daniel d kang gmail com>.
Signed-off-by: Ronald S. Bultje <rsbultje gmail com>
Justin Ruggles [Wed, 19 Jan 2011 20:02:05 +0000 (20:02 +0000)]
Fix use of sstep/dstep in ff_iir_filter().
Signed-off-by: Mans Rullgard <mans@mansr.com>
Justin Ruggles [Tue, 18 Jan 2011 17:58:49 +0000 (17:58 +0000)]
Add regression test for stereo s16le in voc.
Signed-off-by: Mans Rullgard <mans@mansr.com>
Mans Rullgard [Wed, 6 Oct 2010 23:44:52 +0000 (00:44 +0100)]
configure: fix mktemp test and fallback function
Mans Rullgard [Sun, 16 Jan 2011 18:42:36 +0000 (18:42 +0000)]
ARM: improve VFP ABI check
Recent gcc versions define __ARM_PCS or __ARM_PCS_VFP to indicate the
VFP ABI in use, and ARM RVCT defines __SOFTFP__ when using this ABI.
If none of these are defined, check $cross_prefix and $cc for the
substring "hardfloat", and finally fall back to a linker test. This
gives the correct result in most configurations.
Mans Rullgard [Sun, 16 Jan 2011 12:50:49 +0000 (12:50 +0000)]
armcc: suppress warning about hardfp compatibility
Mans Rullgard [Sat, 15 Jan 2011 14:55:08 +0000 (14:55 +0000)]
armcc: suppress 'assignment in condition' warning
Mans Rullgard [Sun, 16 Jan 2011 12:27:37 +0000 (12:27 +0000)]
fate: simplify vp8 rules
Mans Rullgard [Sat, 15 Jan 2011 22:34:49 +0000 (22:34 +0000)]
a64enc: make PixelFormat arrays const
Mans Rullgard [Sat, 15 Jan 2011 22:09:35 +0000 (22:09 +0000)]
Replace ASMALIGN() with .p2align
This macro has unconditionally used .p2align for a long time and
serves no useful purpose.
Mans Rullgard [Fri, 25 Jun 2010 01:37:22 +0000 (02:37 +0100)]
x86: remove VLA in ac3_downmix_sse
Mans Rullgard [Thu, 7 Oct 2010 12:54:10 +0000 (13:54 +0100)]
regtest: add openssl to md5 alternatives
Mans Rullgard [Wed, 6 Oct 2010 14:54:35 +0000 (15:54 +0100)]
configure: make $TMPE executable
This is required on systems where the linker does not change
the permissions of an existing output file.
Mans Rullgard [Sat, 15 Jan 2011 15:09:26 +0000 (15:09 +0000)]
cpu-test: include stdio.h only for test prog
Mans Rullgard [Fri, 15 Oct 2010 10:31:58 +0000 (11:31 +0100)]
Use -Bsymbolic for shared libs only, not executables
Some linkers fail if this flag is used when creating an executable file.
Since the flag is meaningful only for shared libraries, dropping it from
the main link flags is correct.
Mans Rullgard [Mon, 18 Oct 2010 20:42:26 +0000 (21:42 +0100)]
Use INFINITY and NAN macros instead of 1/0 and 0/0
Mans Rullgard [Wed, 6 Oct 2010 14:36:58 +0000 (15:36 +0100)]
Fix quoting in version.sh
Mans Rullgard [Thu, 7 Oct 2010 02:11:55 +0000 (03:11 +0100)]
avfilter: remove stray semicolon
Mans Rullgard [Sun, 16 Jan 2011 19:23:00 +0000 (19:23 +0000)]
Update git-howto with ffmpeg.org URLs
Janne Grunau [Tue, 18 Jan 2011 19:44:24 +0000 (20:44 +0100)]
consolidate .gitignore patters into a single file
Signed-off-by: Janne Grunau <janne-ffmpeg@jannau.net>
Jason Garrett-Glaser [Tue, 18 Jan 2011 19:16:05 +0000 (11:16 -0800)]
Deprecate CREDITS
It's useless now that we've switched to git.
Jason Garrett-Glaser [Tue, 18 Jan 2011 19:05:51 +0000 (11:05 -0800)]
Initial MAINTAINERS update
Per http://lists.mplayerhq.hu/pipermail/ffmpeg-devel/2011-January/103440.html.
Justin Ruggles [Tue, 18 Jan 2011 17:25:44 +0000 (12:25 -0500)]
Revise check for codec id in voc demuxer.
This fixes demuxing of packets that do not contain a codec tag and come before the codec_id has been set.
Justin Ruggles [Tue, 18 Jan 2011 12:38:50 +0000 (07:38 -0500)]
Fix bug in voc demuxer that was introduced in SVN r26309.
Fixes issue 2560.
Justin Ruggles [Tue, 18 Jan 2011 16:40:13 +0000 (11:40 -0500)]
cosmetics: reindent
Daniel Kang [Tue, 18 Jan 2011 16:30:33 +0000 (11:30 -0500)]
Add check for changing number of channels in DCA.
Fixes issue 2505.
Michael Niedermayer [Tue, 18 Jan 2011 15:02:15 +0000 (16:02 +0100)]
Update threshold to detect real timebase for stream copy.
This may fix a bug where quicktime files use 1/600 timebase.
Reimar Döffinger [Tue, 18 Jan 2011 06:59:49 +0000 (07:59 +0100)]
Missing parts of IVF muxer support.
Michael Niedermayer [Mon, 17 Jan 2011 20:38:56 +0000 (21:38 +0100)]
Feed the filter chain with the sample aspect ratio from the muxer or codec layer
like it has been done prior libavfilter.
Anssi Hannula [Mon, 17 Jan 2011 21:51:11 +0000 (23:51 +0200)]
Add my GPG fingerprint to MAINTAINERS
Stefano Sabatini [Sun, 16 Jan 2011 17:17:00 +0000 (18:17 +0100)]
Merge two if (got_picture) {} blocks in ffplay.c:get_video_frame().
Janne Grunau [Mon, 17 Jan 2011 21:13:50 +0000 (22:13 +0100)]
update av_log_missing_feature() to git
Signed-off-by: Janne Grunau <janne-ffmpeg@jannau.net>
Lou Logan [Mon, 17 Jan 2011 20:44:19 +0000 (11:44 -0900)]
Change SVN to Git in configure
Changes "version from SVN" to "version from Git".
Signed-off-by: Janne Grunau <janne-ffmpeg@jannau.net>
Stefano Sabatini [Sun, 16 Jan 2011 17:11:34 +0000 (18:11 +0100)]
Remove outcommented fossil code.
Reimar Döffinger [Mon, 17 Jan 2011 20:16:41 +0000 (21:16 +0100)]
Explain how to set up user name/email correctly for git.
Reimar Döffinger [Mon, 17 Jan 2011 20:11:51 +0000 (21:11 +0100)]
Add muxer for IVF format.
John Wimer [Mon, 17 Jan 2011 15:00:17 +0000 (16:00 +0100)]
prevent integer overflow in calculating duration
Signed-off-by: Martin Storsjö <martin@martin.st>
Janne Grunau [Mon, 17 Jan 2011 14:49:11 +0000 (15:49 +0100)]
convert svn:ignore properties to .gitignore files
Signed-off-by: Janne Grunau <janne-ffmpeg@jannau.net>
Janne Grunau [Mon, 17 Jan 2011 10:28:59 +0000 (11:28 +0100)]
Add instructions how to check out a specific svn revision with git
Signed-off-by: Janne Grunau <janne-ffmpeg@jannau.net>
Janne Grunau [Mon, 17 Jan 2011 10:02:53 +0000 (10:02 +0000)]
rewrite git-howto for the no merge policy
Originally committed as revision 26400 to svn://svn.ffmpeg.org/ffmpeg/trunk
Carl Eugen Hoyos [Mon, 17 Jan 2011 09:17:19 +0000 (09:17 +0000)]
Fix date and revision for lavc 52.104.
Originally committed as revision 26399 to svn://svn.ffmpeg.org/ffmpeg/trunk
Alexander Strange [Mon, 17 Jan 2011 08:36:13 +0000 (08:36 +0000)]
VP3: remove an unnecessary static variable
Originally committed as revision 26398 to svn://svn.ffmpeg.org/ffmpeg/trunk
Michael Niedermayer [Sun, 16 Jan 2011 22:08:34 +0000 (22:08 +0000)]
Allocate last picture for 4xm pfrm if its not allocated.
Fixes segfault and issue2527
Originally committed as revision 26397 to svn://svn.ffmpeg.org/ffmpeg/trunk
Alex Converse [Sun, 16 Jan 2011 20:16:01 +0000 (20:16 +0000)]
Fix two typos in git howto.
Originally committed as revision 26396 to svn://svn.ffmpeg.org/ffmpeg/trunk
Stefano Sabatini [Sun, 16 Jan 2011 20:11:46 +0000 (20:11 +0000)]
Make config_props() return AVERROR(EINVAL) rather than 1 in case of
failed SWScaleContext initialization.
Fix issue2546.
Originally committed as revision 26395 to svn://svn.ffmpeg.org/ffmpeg/trunk
Ramiro Polla [Sun, 16 Jan 2011 18:34:09 +0000 (18:34 +0000)]
use git describe for naming version in pure git clones
Patch by: Ramiro Polla <ramiro <DOT> polla gmail <DOT> com>
Originally committed as revision 26394 to svn://svn.ffmpeg.org/ffmpeg/trunk
Janne Grunau [Sun, 16 Jan 2011 18:29:08 +0000 (18:29 +0000)]
fix typo in git howto section heading
spotted by ubitux on irc
Originally committed as revision 26393 to svn://svn.ffmpeg.org/ffmpeg/trunk
Michael Niedermayer [Sun, 16 Jan 2011 18:22:29 +0000 (18:22 +0000)]
Check 4xm headers for validity. This should avoid 1/0.
Originally committed as revision 26392 to svn://svn.ffmpeg.org/ffmpeg/trunk
Janne Grunau [Sun, 16 Jan 2011 18:20:06 +0000 (18:20 +0000)]
Add section how to find a svn changeset with git commands
Originally committed as revision 26391 to svn://svn.ffmpeg.org/ffmpeg/trunk
Stefano Sabatini [Sun, 16 Jan 2011 17:26:00 +0000 (17:26 +0000)]
Fix weird indent in get_video_frame().
Originally committed as revision 26390 to svn://svn.ffmpeg.org/ffmpeg/trunk
Anton Khirnov [Sun, 16 Jan 2011 17:16:48 +0000 (17:16 +0000)]
Add git-howto.
mostly written by Luca.
Originally committed as revision 26389 to svn://svn.ffmpeg.org/ffmpeg/trunk
Sascha Sommer [Sun, 16 Jan 2011 16:39:53 +0000 (16:39 +0000)]
support decoding of files that contain the number
of vector coded coefficients in their bitstream
fixes issue 2536
Originally committed as revision 26388 to svn://svn.ffmpeg.org/ffmpeg/trunk
Stefano Sabatini [Sun, 16 Jan 2011 13:04:56 +0000 (13:04 +0000)]
In ffmpeg.texi, prefer @itemize lists over text formatted "*" lists.
Originally committed as revision 26387 to svn://svn.ffmpeg.org/ffmpeg/trunk
Carl Eugen Hoyos [Sun, 16 Jan 2011 12:45:59 +0000 (12:45 +0000)]
Values >4 for lowres corrupt output.
Originally committed as revision 26386 to svn://svn.ffmpeg.org/ffmpeg/trunk
Stefano Sabatini [Sun, 16 Jan 2011 12:45:42 +0000 (12:45 +0000)]
Reformat documentation for -vsync @var{parameter}.
Make use of "@table @option" for showing the valid values for the
option.
Originally committed as revision 26385 to svn://svn.ffmpeg.org/ffmpeg/trunk
Carl Eugen Hoyos [Sun, 16 Jan 2011 12:42:43 +0000 (12:42 +0000)]
Since lowres == crop for bmp, remove it to avoid confusion.
Originally committed as revision 26384 to svn://svn.ffmpeg.org/ffmpeg/trunk
Ronald S. Bultje [Sun, 16 Jan 2011 03:20:03 +0000 (03:20 +0000)]
Fix fate breakage in r26382.
Originally committed as revision 26383 to svn://svn.ffmpeg.org/ffmpeg/trunk
Baptiste Coudurier [Sun, 16 Jan 2011 02:47:25 +0000 (02:47 +0000)]
Remove useless free, fix warning:
libavfilter/defaults.c: In function 'avfilter_default_get_audio_buffer':
libavfilter/defaults.c:129: warning: 'buf' is used uninitialized in this function
Originally committed as revision 26382 to svn://svn.ffmpeg.org/ffmpeg/trunk
Ronald S. Bultje [Sat, 15 Jan 2011 22:00:44 +0000 (22:00 +0000)]
Fix overflow in pred16x16_plane x86 simd code. Fixes issue 2547.
Originally committed as revision 26381 to svn://svn.ffmpeg.org/ffmpeg/trunk
Stefano Sabatini [Sat, 15 Jan 2011 20:43:01 +0000 (20:43 +0000)]
Include libavcore/audioconvert.h, required for
av_get_channel_layout_string() in ff_dprintf_link.
Fix compilation.
Originally committed as revision 26380 to svn://svn.ffmpeg.org/ffmpeg/trunk
Stefano Sabatini [Sat, 15 Jan 2011 20:02:03 +0000 (20:02 +0000)]
Reindent.
Originally committed as revision 26379 to svn://svn.ffmpeg.org/ffmpeg/trunk
Stefano Sabatini [Sat, 15 Jan 2011 19:58:29 +0000 (19:58 +0000)]
Make ff_dprintf_link() print meaningful information for audio links.
Originally committed as revision 26378 to svn://svn.ffmpeg.org/ffmpeg/trunk
Jason Garrett-Glaser [Sat, 15 Jan 2011 18:14:36 +0000 (18:14 +0000)]
Remove evil timers that snuck their way into r26375.
Originally committed as revision 26377 to svn://svn.ffmpeg.org/ffmpeg/trunk
Jason Garrett-Glaser [Sat, 15 Jan 2011 18:13:40 +0000 (18:13 +0000)]
Fix r26375 on non-x86.
Originally committed as revision 26376 to svn://svn.ffmpeg.org/ffmpeg/trunk
Jason Garrett-Glaser [Sat, 15 Jan 2011 17:52:48 +0000 (17:52 +0000)]
H.264: Partially inline CABAC residual decoding
Improves CABAC performance about ~1.2%.
Trick originates from x264 and has also been used in ffvp8. It's useful because
coded block flags are usually zero, so it helps to have the early termination
inlined into the main function.
Originally committed as revision 26375 to svn://svn.ffmpeg.org/ffmpeg/trunk