On Mon, Aug 03, 2015 at 10:32:02AM +0000, Carl Eugen Hoyos wrote: > Paul B Mahol <onemda <at> gmail.com> writes: > > > > Attached patch fixes ticket #4747 for me, > > > > I don't know how to detect that the wave > > > atom contains no frma / alac atom... > > > > And that is mentioned because? > > The file from ticket #4747 does not contain an > alac atom which is required for alac decoding. > Instead it contains the necessary data in the > wave atom (where you normally would find the > alac atom). To distinguish, it would be > necessary to look "into" the wave atom to know > if it contains an alac atom or not. > > I meanwhile found that the mpeg demuxer > sometimes seeks eight bytes back which I will > probably copy. The alternative, iiuc, would be > to copy the whole wave atom into a buffer and > call mov_read_default() from the wave_read() > function with that buffer. > But this should not be necessary if somebody > can confirm that it is ok to seek back x bytes > in a demuxer.
it is safe if ffio_ensure_seekback() is used with appropriate arguments before these x bytes are read (or the stream is seekable or ...) [...] -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB No snowflake in an avalanche ever feels responsible. -- Voltaire
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