[FFmpeg-devel] [PATCH] avcodec/avcodec: Correct and make consistent AVERROR() in comments
michael at niedermayer.cc
Mon Mar 27 02:30:06 EEST 2017
On Sun, Mar 26, 2017 at 05:19:59PM -0400, Ronald S. Bultje wrote:
> On Sun, Mar 26, 2017 at 3:17 PM, Michael Niedermayer <michael at niedermayer.cc
> > wrote:
> > Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> > ---
> > libavcodec/avcodec.h | 8 ++++----
> > 1 file changed, 4 insertions(+), 4 deletions(-)
> > diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
> > index af327ff9ad..4f3303366f 100644
> > --- a/libavcodec/avcodec.h
> > +++ b/libavcodec/avcodec.h
> > @@ -153,7 +153,7 @@
> > * Unlike with the old video decoding API, multiple frames might result
> > from
> > * a packet. For audio, splitting the input packet into frames by
> > partially
> > * decoding packets becomes transparent to the API user. You never need
> > to
> > - * feed an AVPacket to the API twice (unless it is rejected with EAGAIN
> > - then
> > + * feed an AVPacket to the API twice (unless it is rejected with
> > AVERROR(EAGAIN) - then
> > * no data was read from the packet).
> > * Additionally, sending a flush/draining packet is required only once.
> > * - avcodec_encode_video2()/avcodec_encode_audio2():
> > @@ -169,10 +169,10 @@
> > * Some codecs might require using the new API; using the old API will
> > return
> > * an error when calling it. All codecs support the new API.
> > *
> > - * A codec is not allowed to return EAGAIN for both sending and
> > receiving. This
> > + * A codec is not allowed to return AVERROR(EAGAIN) for both sending and
> > receiving. This
> > * would be an invalid state, which could put the codec user into an
> > endless
> > * loop. The API has no concept of time either: it cannot happen that
> > trying to
> > - * do avcodec_send_packet() results in EAGAIN, but a repeated call 1
> > second
> > + * do avcodec_send_packet() results in AVERROR(EAGAIN), but a repeated
> > call 1 second
> > * later accepts the packet (with no other receive/flush API calls
> > involved).
> > * The API is a strict state machine, and the passage of time is not
> > supposed
> > * to influence it. Some timing-dependent behavior might still be deemed
> > @@ -181,7 +181,7 @@
> > * avoided that the current state is "unstable" and can "flip-flop"
> > between
> > * the send/receive APIs allowing progress. For example, it's not allowed
> > that
> > * the codec randomly decides that it actually wants to consume a packet
> > now
> > - * instead of returning a frame, after it just returned EAGAIN on an
> > + * instead of returning a frame, after it just returned AVERROR(EAGAIN)
> > on an
> > * avcodec_send_packet() call.
> > * @}
> > */
> > --
> > 2.11.0
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"Used only once" - "Some unspecified defect prevented a second use"
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