On Tue, Sep 23, 2014 at 03:11:58PM +0200, Michael Niedermayer wrote:
> On Tue, Sep 23, 2014 at 01:33:30PM +0200, Benoit Fouet wrote:
> > Hi,
> >
> > ----- Mail original -----
> > > Hi,
> > >
> > > ----- Mail original -----
> > > > On Tue, Sep 23, 2014 at 10:19:17AM +0200, Benoit Fouet wrote:
> > >
> > > > > Here is a patch to illustrate this...
> > > >
> > > > this looks better but:
> > > >
> > > >
> > > > [...]
> > > > > - ff_put_bmp_header(pb, enc, ff_codec_bmp_tags, 0,
> > > > > 0);
> > > > > + if (keep_height) {
> > > > > + enc->extradata_size -= 9;
> > > > > + if (!enc->extradata_size)
> > > > > + av_freep(&enc->extradata);
> > > > > + }
> > > >
> > > > what if extradata is stored in 2 files, the 2nd muxer would no
> > > > longer
> > > > see it
> > > > also the muxer shouldnt change the encoders/demuxer extradata
> > > >
> > > > and cant all this logic be put in ff_put_bmp_header() ?
> > > > might even be simpler
> > > >
> > >
> > > Do you mean that ff_put_bmp_header() would check for the BottomUp
> > > presence and not negate height in this case, and also only write the
> > > palette in the stream?
> > >
> >
> > Patch attached, just in case this is what you meant...
>
> > riffenc.c | 6 ++++--
> > 1 file changed, 4 insertions(+), 2 deletions(-)
> > d3a93efc5680ad2340086a61ba3d59749f67e770
> > 0001-avformat-riffenc-extend-ff_put_bmp_header-to-be-able.patch
> > From b8c8f07555769215af7a10c48e7a479f783a7c49 Mon Sep 17 00:00:00 2001
> > From: Benoit Fouet <benoit.fo...@free.fr>
> > Date: Tue, 23 Sep 2014 10:07:10 +0200
> > Subject: [PATCH] avformat/riffenc: extend ff_put_bmp_header to be able to
> > force height to not be changed.
> >
> > When stream copying, height shouldn't be changed when writing the
> > BITMAPINFOHEADER header if the BottomUp information is present in the
> > extradata.
> > ---
> > libavformat/riffenc.c | 6 ++++--
> > 1 file changed, 4 insertions(+), 2 deletions(-)
> >
> > diff --git a/libavformat/riffenc.c b/libavformat/riffenc.c
> > index ef4d399..f1a2274 100644
> > --- a/libavformat/riffenc.c
> > +++ b/libavformat/riffenc.c
> > @@ -209,11 +209,13 @@ int ff_put_wav_header(AVIOContext *pb, AVCodecContext
> > *enc, int flags)
> > void ff_put_bmp_header(AVIOContext *pb, AVCodecContext *enc,
> > const AVCodecTag *tags, int for_asf, int
> > ignore_extradata)
> > {
> > + int keep_height = enc->extradata_size >= 9 &&
> > + !memcmp(enc->extradata + enc->extradata_size - 9,
> > "BottomUp", 9);
> > /* size */
> > avio_wl32(pb, 40 + (ignore_extradata ? 0 : enc->extradata_size));
> > avio_wl32(pb, enc->width);
> > //We always store RGB TopDown
> > - avio_wl32(pb, enc->codec_tag ? enc->height : -enc->height);
> > + avio_wl32(pb, enc->codec_tag || keep_height ? enc->height :
> > -enc->height);
> > /* planes */
> > avio_wl16(pb, 1);
> > /* depth */
>
> > @@ -227,7 +229,7 @@ void ff_put_bmp_header(AVIOContext *pb, AVCodecContext
> > *enc,
> > avio_wl32(pb, 0);
> >
> > if (!ignore_extradata) {
> > - avio_write(pb, enc->extradata, enc->extradata_size);
> > + avio_write(pb, enc->extradata, keep_height ? enc->extradata_size :
> > enc->extradata_size - 9);
>
> this corrupts the stored extradata and breaks fatefixed and applied thanks [...] -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB Those who are best at talking, realize last or never when they are wrong.
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