[FFmpeg-devel] Patch: file_seek() should not support AVSEEK_SIZE

avcoder ffmpeg
Mon Jan 4 13:46:29 CET 2010

On Mon, Jan 4, 2010 at 8:12 PM, Michael Niedermayer <michaelni at gmx.at>wrote:

> On Mon, Jan 04, 2010 at 11:14:51AM +0800, avcoder wrote:
> > Dear:
> >
> > file_seek() should ignore AVSEEK_SIZE operation
> what is calling it with that?

It is just a hack for HTTP--like protocol to act as a shortcut of getting
the file size,
url_fsize() alway passes AVSEEK_SIZE as whence to obtain file size:

int64_t url_fsize(ByteIOContext *s)
    int64_t size;

        return AVERROR(EINVAL);

    if (!s->seek)
        return AVERROR(EPIPE);
    size = s->seek(s->opaque, 0, AVSEEK_SIZE);
        if ((size = s->seek(s->opaque, -1, SEEK_END)) < 0)
            return size;
        s->seek(s->opaque, s->pos, SEEK_SET);
    return size;

> and we cant list all int values that it should ignore
I agree, but  AVSEEK_SIZE is not a valid value for lseek(...)

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