| Message ID | 20230725213838.199190-2-mailingradian@gmail.com |
|---|---|
| State | New |
| Headers | show |
| Series | [FFmpeg-devel,v2] avcodec/v4l2_context: suppress POLLERR when buffers are uninitialized | expand |
| Context | Check | Description |
|---|---|---|
| yinshiyou/make_loongarch64 | success | Make finished |
| yinshiyou/make_fate_loongarch64 | success | Make fate finished |
| andriy/make_x86 | success | Make finished |
| andriy/make_fate_x86 | success | Make fate finished |
On Tue, 25 Jul 2023, Richard Acayan wrote: > A POLLERR occurs when libavcodec attempts to dequeue output buffers > before enqueuing capture buffers. This could happen to an application > deciding to send the first coded packet. Suppress these POLLERRs when > the buffers are uninitialized. Will apply, thanks. Marton > > See https://trac.ffmpeg.org/ticket/9957 for the original bug report. > > Signed-off-by: Richard Acayan <mailingradian@gmail.com> > --- > Changes since v1 (20230718220017.3336-1-mailingradian@gmail.com): > - stopped emitting POLLERR logs for this case (thanks to feedback from > Marton Balint) > > libavcodec/v4l2_context.c | 8 ++++++-- > 1 file changed, 6 insertions(+), 2 deletions(-) > > diff --git a/libavcodec/v4l2_context.c b/libavcodec/v4l2_context.c > index a40be94690..f20f713e1d 100644 > --- a/libavcodec/v4l2_context.c > +++ b/libavcodec/v4l2_context.c > @@ -325,9 +325,13 @@ start: > > /* 0. handle errors */ > if (pfd.revents & POLLERR) { > - /* if we are trying to get free buffers but none have been queued yet > - no need to raise a warning */ > + /* if we are trying to get free buffers but none have been queued yet, > + * or if no buffers have been allocated yet, no need to raise a warning > + */ > if (timeout == 0) { > + if (!ctx->buffers) > + return NULL; > + > for (i = 0; i < ctx->num_buffers; i++) { > if (ctx->buffers[i].status != V4L2BUF_AVAILABLE) > av_log(logger(ctx), AV_LOG_WARNING, "%s POLLERR\n", ctx->name); > -- > 2.41.0 > > _______________________________________________ > ffmpeg-devel mailing list > ffmpeg-devel@ffmpeg.org > https://ffmpeg.org/mailman/listinfo/ffmpeg-devel > > To unsubscribe, visit link above, or email > ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe". >
diff --git a/libavcodec/v4l2_context.c b/libavcodec/v4l2_context.c index a40be94690..f20f713e1d 100644 --- a/libavcodec/v4l2_context.c +++ b/libavcodec/v4l2_context.c @@ -325,9 +325,13 @@ start: /* 0. handle errors */ if (pfd.revents & POLLERR) { - /* if we are trying to get free buffers but none have been queued yet - no need to raise a warning */ + /* if we are trying to get free buffers but none have been queued yet, + * or if no buffers have been allocated yet, no need to raise a warning + */ if (timeout == 0) { + if (!ctx->buffers) + return NULL; + for (i = 0; i < ctx->num_buffers; i++) { if (ctx->buffers[i].status != V4L2BUF_AVAILABLE) av_log(logger(ctx), AV_LOG_WARNING, "%s POLLERR\n", ctx->name);
A POLLERR occurs when libavcodec attempts to dequeue output buffers before enqueuing capture buffers. This could happen to an application deciding to send the first coded packet. Suppress these POLLERRs when the buffers are uninitialized. See https://trac.ffmpeg.org/ticket/9957 for the original bug report. Signed-off-by: Richard Acayan <mailingradian@gmail.com> --- Changes since v1 (20230718220017.3336-1-mailingradian@gmail.com): - stopped emitting POLLERR logs for this case (thanks to feedback from Marton Balint) libavcodec/v4l2_context.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)