On Wed, Apr 3, 2019 at 10:42 PM Marton Balint <c...@passwd.hu> wrote:
>
> Signed-off-by: Marton Balint <c...@passwd.hu>
> ---
> doc/protocols.texi | 9 +++++++++
> libavformat/file.c | 5 +++++
> 2 files changed, 14 insertions(+)
>
> diff --git a/doc/protocols.texi b/doc/protocols.texi
> index e1caa049a5..34967ff5e2 100644
> --- a/doc/protocols.texi
> +++ b/doc/protocols.texi
> @@ -199,6 +199,15 @@ If set to 1, the protocol will retry reading at the end
> of the file, allowing
> reading files that still are being written. In order for this to terminate,
> you either need to use the rw_timeout option, or use the interrupt callback
> (for API users).
> +
> +@item seekable
> +Controls if seekability is advertised on the file. 1 means seekable, 0 means
> +non-seekable, -1 means auto (seekable for normal files, non-seekable for
> named
> +pipes).
> +
> +Many demuxers handle seekable and non-seekable resources differently,
> +overriding this might speed up opening certain files at the cost of losing
> some
> +features (e.g. accurate seeking).
> @end table
>
> @section ftp
> diff --git a/libavformat/file.c b/libavformat/file.c
> index e613b91010..e46596fed1 100644
> --- a/libavformat/file.c
> +++ b/libavformat/file.c
> @@ -73,6 +73,7 @@ typedef struct FileContext {
> int trunc;
> int blocksize;
> int follow;
> + int seekable;
> #if HAVE_DIRENT_H
> DIR *dir;
> #endif
> @@ -82,6 +83,7 @@ static const AVOption file_options[] = {
> { "truncate", "truncate existing files on write", offsetof(FileContext,
> trunc), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, AV_OPT_FLAG_ENCODING_PARAM },
> { "blocksize", "set I/O operation maximum block size",
> offsetof(FileContext, blocksize), AV_OPT_TYPE_INT, { .i64 = INT_MAX }, 1,
> INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
> { "follow", "Follow a file as it is being written",
> offsetof(FileContext, follow), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1,
> AV_OPT_FLAG_DECODING_PARAM },
> + { "seekable", "Sets if the file is seekable", offsetof(FileContext,
> seekable), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 1, AV_OPT_FLAG_DECODING_PARAM
> | AV_OPT_FLAG_ENCODING_PARAM },
> { NULL }
> };
>
> @@ -238,6 +240,9 @@ static int file_open(URLContext *h, const char *filename,
> int flags)
> if (!h->is_streamed && flags & AVIO_FLAG_WRITE)
> h->min_packet_size = h->max_packet_size = 262144;
>
> + if (c->seekable >= 0)
> + h->is_streamed = !c->seekable;
> +
You should probably not let a user enable seeking if the resource
doesn't allow it.
- Hendrik
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