[FFmpeg-devel] [PATCH] pthread: Allow thread_count==0

[Måns Rullgård]

Takashi Mochizuki <mochi at da2.so-net.ne.jp> writes:

> Some codec like libx264 uses thread_count==0 as Automatic mode.
>
> But, "Frame-based multithreading framework using pthreads" 
>  (commit: 37b00b47cbeecd66bb34c5c7c534d016d6e8da24)
> does not allow thread_count==0.
>
> Here is a tiny patch.
>
> Takashi Mochizuki
>
> //
>
> ---
>  libavcodec/pthread.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/libavcodec/pthread.c b/libavcodec/pthread.c
> index 0e033d3..6b989ac 100644
> --- a/libavcodec/pthread.c
> +++ b/libavcodec/pthread.c
> @@ -877,7 +877,7 @@ int ff_thread_init(AVCodecContext *avctx, int thread_count)
>          return -1;
>      }
>
> -    avctx->thread_count = FFMAX(1, thread_count);
> +    avctx->thread_count = FFMAX(0, thread_count);

I'm pretty sure this has come up before, and that there was some reason
for things being as they are.  I don't remember the details without
digging in the archives.

-- 
M?ns Rullg?rd
mans at mansr.com