The following patch will make snd_pcm_poll_descriptors_revents() return the correct value when used on a jack plugin device. The current version returns POLLIN regardless of capture or playback.
--- pcm_jack_orig.c 2011-12-29 16:42:07.000000000 +0100 +++ pcm_jack.c 2011-12-29 16:51:18.000000000 +0100 @@ -77,17 +77,18 @@ return 0; }
-static int snd_pcm_jack_poll_revents(snd_pcm_ioplug_t *io ATTRIBUTE_UNUSED, +static int snd_pcm_jack_poll_revents(snd_pcm_ioplug_t *io, struct pollfd *pfds, unsigned int nfds, unsigned short *revents) { static char buf[1];
assert(pfds && nfds == 1 && revents); - read(pfds[0].fd, buf, 1); - - *revents = pfds[0].revents; + *revents = pfds[0].revents & ~(POLLIN | POLLOUT); + if (pfds[0].revents & POLLIN) { + *revents |= (io->stream == SND_PCM_STREAM_PLAYBACK) ? POLLOUT : POLLIN; + } return 0; }
Ciao,