/*** This file is part of PulseAudio. Copyright 2004-2006 Lennart Poettering Copyright 2006 Pierre Ossman for Cendio AB PulseAudio is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. PulseAudio is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with PulseAudio; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. ***/ #ifdef HAVE_CONFIG_H #include #endif #include #include #include #include #include #include #include #include #include #include #include #include #include "alsa-util.h" #ifdef HAVE_HAL #include "hal-util.h" #endif struct pa_alsa_fdlist { unsigned num_fds; struct pollfd *fds; /* This is a temporary buffer used to avoid lots of mallocs */ struct pollfd *work_fds; snd_mixer_t *mixer; pa_mainloop_api *m; pa_defer_event *defer; pa_io_event **ios; pa_bool_t polled; void (*cb)(void *userdata); void *userdata; }; static void io_cb(pa_mainloop_api*a, pa_io_event* e, int fd, pa_io_event_flags_t events, void *userdata) { struct pa_alsa_fdlist *fdl = userdata; int err; unsigned i; unsigned short revents; pa_assert(a); pa_assert(fdl); pa_assert(fdl->mixer); pa_assert(fdl->fds); pa_assert(fdl->work_fds); if (fdl->polled) return; fdl->polled = TRUE; memcpy(fdl->work_fds, fdl->fds, sizeof(struct pollfd) * fdl->num_fds); for (i = 0; i < fdl->num_fds; i++) { if (e == fdl->ios[i]) { if (events & PA_IO_EVENT_INPUT) fdl->work_fds[i].revents |= POLLIN; if (events & PA_IO_EVENT_OUTPUT) fdl->work_fds[i].revents |= POLLOUT; if (events & PA_IO_EVENT_ERROR) fdl->work_fds[i].revents |= POLLERR; if (events & PA_IO_EVENT_HANGUP) fdl->work_fds[i].revents |= POLLHUP; break; } } pa_assert(i != fdl->num_fds); if ((err = snd_mixer_poll_descriptors_revents(fdl->mixer, fdl->work_fds, fdl->num_fds, &revents)) < 0) { pa_log_error("Unable to get poll revent: %s", snd_strerror(err)); return; } a->defer_enable(fdl->defer, 1); if (revents) snd_mixer_handle_events(fdl->mixer); } static void defer_cb(pa_mainloop_api*a, pa_defer_event* e, void *userdata) { struct pa_alsa_fdlist *fdl = userdata; unsigned num_fds, i; int err; struct pollfd *temp; pa_assert(a); pa_assert(fdl); pa_assert(fdl->mixer); a->defer_enable(fdl->defer, 0); num_fds = (unsigned) snd_mixer_poll_descriptors_count(fdl->mixer); if (num_fds != fdl->num_fds) { if (fdl->fds) pa_xfree(fdl->fds); if (fdl->work_fds) pa_xfree(fdl->work_fds); fdl->fds = pa_xnew0(struct pollfd, num_fds); fdl->work_fds = pa_xnew(struct pollfd, num_fds); } memset(fdl->work_fds, 0, sizeof(struct pollfd) * num_fds); if ((err = snd_mixer_poll_descriptors(fdl->mixer, fdl->work_fds, num_fds)) < 0) { pa_log_error("Unable to get poll descriptors: %s", snd_strerror(err)); return; } fdl->polled = FALSE; if (memcmp(fdl->fds, fdl->work_fds, sizeof(struct pollfd) * num_fds) == 0) return; if (fdl->ios) { for (i = 0; i < fdl->num_fds; i++) a->io_free(fdl->ios[i]); if (num_fds != fdl->num_fds) { pa_xfree(fdl->ios); fdl->ios = NULL; } } if (!fdl->ios) fdl->ios = pa_xnew(pa_io_event*, num_fds); /* Swap pointers */ temp = fdl->work_fds; fdl->work_fds = fdl->fds; fdl->fds = temp; fdl->num_fds = num_fds; for (i = 0;i < num_fds;i++) fdl->ios[i] = a->io_new(a, fdl->fds[i].fd, ((fdl->fds[i].events & POLLIN) ? PA_IO_EVENT_INPUT : 0) | ((fdl->fds[i].events & POLLOUT) ? PA_IO_EVENT_OUTPUT : 0), io_cb, fdl); } struct pa_alsa_fdlist *pa_alsa_fdlist_new(void) { struct pa_alsa_fdlist *fdl; fdl = pa_xnew0(struct pa_alsa_fdlist, 1); fdl->num_fds = 0; fdl->fds = NULL; fdl->work_fds = NULL; fdl->mixer = NULL; fdl->m = NULL; fdl->defer = NULL; fdl->ios = NULL; fdl->polled = FALSE; return fdl; } void pa_alsa_fdlist_free(struct pa_alsa_fdlist *fdl) { pa_assert(fdl); if (fdl->defer) { pa_assert(fdl->m); fdl->m->defer_free(fdl->defer); } if (fdl->ios) { unsigned i; pa_assert(fdl->m); for (i = 0; i < fdl->num_fds; i++) fdl->m->io_free(fdl->ios[i]); pa_xfree(fdl->ios); } if (fdl->fds) pa_xfree(fdl->fds); if (fdl->work_fds) pa_xfree(fdl->work_fds); pa_xfree(fdl); } int pa_alsa_fdlist_set_mixer(struct pa_alsa_fdlist *fdl, snd_mixer_t *mixer_handle, pa_mainloop_api* m) { pa_assert(fdl); pa_assert(mixer_handle); pa_assert(m); pa_assert(!fdl->m); fdl->mixer = mixer_handle; fdl->m = m; fdl->defer = m->defer_new(m, defer_cb, fdl); return 0; } static int set_format(snd_pcm_t *pcm_handle, snd_pcm_hw_params_t *hwparams, pa_sample_format_t *f) { static const snd_pcm_format_t format_trans[] = { [PA_SAMPLE_U8] = SND_PCM_FORMAT_U8, [PA_SAMPLE_ALAW] = SND_PCM_FORMAT_A_LAW, [PA_SAMPLE_ULAW] = SND_PCM_FORMAT_MU_LAW, [PA_SAMPLE_S16LE] = SND_PCM_FORMAT_S16_LE, [PA_SAMPLE_S16BE] = SND_PCM_FORMAT_S16_BE, [PA_SAMPLE_FLOAT32LE] = SND_PCM_FORMAT_FLOAT_LE, [PA_SAMPLE_FLOAT32BE] = SND_PCM_FORMAT_FLOAT_BE, [PA_SAMPLE_S32LE] = SND_PCM_FORMAT_S32_LE, [PA_SAMPLE_S32BE] = SND_PCM_FORMAT_S32_BE, [PA_SAMPLE_S24LE] = SND_PCM_FORMAT_S24_3LE, [PA_SAMPLE_S24BE] = SND_PCM_FORMAT_S24_3BE, [PA_SAMPLE_S24_32LE] = SND_PCM_FORMAT_S24_LE, [PA_SAMPLE_S24_32BE] = SND_PCM_FORMAT_S24_BE, }; static const pa_sample_format_t try_order[] = { PA_SAMPLE_FLOAT32NE, PA_SAMPLE_FLOAT32RE, PA_SAMPLE_S32NE, PA_SAMPLE_S32RE, PA_SAMPLE_S24_32NE, PA_SAMPLE_S24_32RE, PA_SAMPLE_S24NE, PA_SAMPLE_S24RE, PA_SAMPLE_S16NE, PA_SAMPLE_S16RE, PA_SAMPLE_ALAW, PA_SAMPLE_ULAW, PA_SAMPLE_U8, PA_SAMPLE_INVALID }; int i, ret; pa_assert(pcm_handle); pa_assert(f); if ((ret = snd_pcm_hw_params_set_format(pcm_handle, hwparams, format_trans[*f])) >= 0) return ret; if (*f == PA_SAMPLE_FLOAT32BE) *f = PA_SAMPLE_FLOAT32LE; else if (*f == PA_SAMPLE_FLOAT32LE) *f = PA_SAMPLE_FLOAT32BE; else if (*f == PA_SAMPLE_S24BE) *f = PA_SAMPLE_S24LE; else if (*f == PA_SAMPLE_S24LE) *f = PA_SAMPLE_S24BE; else if (*f == PA_SAMPLE_S24_32BE) *f = PA_SAMPLE_S24_32LE; else if (*f == PA_SAMPLE_S24_32LE) *f = PA_SAMPLE_S24_32BE; else if (*f == PA_SAMPLE_S16BE) *f = PA_SAMPLE_S16LE; else if (*f == PA_SAMPLE_S16LE) *f = PA_SAMPLE_S16BE; else if (*f == PA_SAMPLE_S32BE) *f = PA_SAMPLE_S32LE; else if (*f == PA_SAMPLE_S32LE) *f = PA_SAMPLE_S32BE; else goto try_auto; if ((ret = snd_pcm_hw_params_set_format(pcm_handle, hwparams, format_trans[*f])) >= 0) return ret; try_auto: for (i = 0; try_order[i] != PA_SAMPLE_INVALID; i++) { *f = try_order[i]; if ((ret = snd_pcm_hw_params_set_format(pcm_handle, hwparams, format_trans[*f])) >= 0) return ret; } return -1; } /* Set the hardware parameters of the given ALSA device. Returns the * selected fragment settings in *period and *period_size */ int pa_alsa_set_hw_params( snd_pcm_t *pcm_handle, pa_sample_spec *ss, uint32_t *periods, snd_pcm_uframes_t *period_size, snd_pcm_uframes_t tsched_size, pa_bool_t *use_mmap, pa_bool_t *use_tsched, pa_bool_t require_exact_channel_number) { int ret = -1; snd_pcm_uframes_t _period_size = period_size ? *period_size : 0; unsigned int _periods = periods ? *periods : 0; snd_pcm_uframes_t buffer_size; unsigned int r = ss->rate; unsigned int c = ss->channels; pa_sample_format_t f = ss->format; snd_pcm_hw_params_t *hwparams; pa_bool_t _use_mmap = use_mmap && *use_mmap; pa_bool_t _use_tsched = use_tsched && *use_tsched; int dir; pa_assert(pcm_handle); pa_assert(ss); snd_pcm_hw_params_alloca(&hwparams); if ((ret = snd_pcm_hw_params_any(pcm_handle, hwparams)) < 0) goto finish; if ((ret = snd_pcm_hw_params_set_rate_resample(pcm_handle, hwparams, 0)) < 0) goto finish; if (_use_mmap) { if (snd_pcm_hw_params_set_access(pcm_handle, hwparams, SND_PCM_ACCESS_MMAP_INTERLEAVED) < 0) { /* mmap() didn't work, fall back to interleaved */ if ((ret = snd_pcm_hw_params_set_access(pcm_handle, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED)) < 0) goto finish; _use_mmap = FALSE; } } else if ((ret = snd_pcm_hw_params_set_access(pcm_handle, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED)) < 0) goto finish; if (!_use_mmap) _use_tsched = FALSE; if ((ret = set_format(pcm_handle, hwparams, &f)) < 0) goto finish; if ((ret = snd_pcm_hw_params_set_rate_near(pcm_handle, hwparams, &r, NULL)) < 0) goto finish; if (require_exact_channel_number) { if ((ret = snd_pcm_hw_params_set_channels(pcm_handle, hwparams, c)) < 0) goto finish; } else { if ((ret = snd_pcm_hw_params_set_channels_near(pcm_handle, hwparams, &c)) < 0) goto finish; } if ((ret = snd_pcm_hw_params_set_periods_integer(pcm_handle, hwparams)) < 0) goto finish; if (_period_size && tsched_size && _periods) { /* Adjust the buffer sizes, if we didn't get the rate we were asking for */ _period_size = (snd_pcm_uframes_t) (((uint64_t) _period_size * r) / ss->rate); tsched_size = (snd_pcm_uframes_t) (((uint64_t) tsched_size * r) / ss->rate); if (_use_tsched) { _period_size = tsched_size; _periods = 1; pa_assert_se(snd_pcm_hw_params_get_buffer_size_max(hwparams, &buffer_size) == 0); pa_log_debug("Maximum hw buffer size is %u ms", (unsigned) buffer_size * 1000 / r); } buffer_size = _periods * _period_size; if (_periods > 0) { /* First we pass 0 as direction to get exactly what we asked * for. That this is necessary is presumably a bug in ALSA */ dir = 0; if ((ret = snd_pcm_hw_params_set_periods_near(pcm_handle, hwparams, &_periods, &dir)) < 0) { dir = 1; if ((ret = snd_pcm_hw_params_set_periods_near(pcm_handle, hwparams, &_periods, &dir)) < 0) { dir = -1; if ((ret = snd_pcm_hw_params_set_periods_near(pcm_handle, hwparams, &_periods, &dir)) < 0) goto finish; } } } if (_period_size > 0) if ((ret = snd_pcm_hw_params_set_buffer_size_near(pcm_handle, hwparams, &buffer_size)) < 0) goto finish; } if ((ret = snd_pcm_hw_params(pcm_handle, hwparams)) < 0) goto finish; if (ss->rate != r) pa_log_info("Device %s doesn't support %u Hz, changed to %u Hz.", snd_pcm_name(pcm_handle), ss->rate, r); if (ss->channels != c) pa_log_info("Device %s doesn't support %u channels, changed to %u.", snd_pcm_name(pcm_handle), ss->channels, c); if (ss->format != f) pa_log_info("Device %s doesn't support sample format %s, changed to %s.", snd_pcm_name(pcm_handle), pa_sample_format_to_string(ss->format), pa_sample_format_to_string(f)); if ((ret = snd_pcm_prepare(pcm_handle)) < 0) goto finish; if ((ret = snd_pcm_hw_params_get_period_size(hwparams, &_period_size, &dir)) < 0 || (ret = snd_pcm_hw_params_get_periods(hwparams, &_periods, &dir)) < 0) goto finish; /* If the sample rate deviates too much, we need to resample */ if (r < ss->rate*.95 || r > ss->rate*1.05) ss->rate = r; ss->channels = (uint8_t) c; ss->format = f; pa_assert(_periods > 0); pa_assert(_period_size > 0); if (periods) *periods = _periods; if (period_size) *period_size = _period_size; if (use_mmap) *use_mmap = _use_mmap; if (use_tsched) *use_tsched = _use_tsched; ret = 0; snd_pcm_nonblock(pcm_handle, 1); finish: return ret; } int pa_alsa_set_sw_params(snd_pcm_t *pcm, snd_pcm_uframes_t avail_min) { snd_pcm_sw_params_t *swparams; int err; pa_assert(pcm); snd_pcm_sw_params_alloca(&swparams); if ((err = snd_pcm_sw_params_current(pcm, swparams) < 0)) { pa_log_warn("Unable to determine current swparams: %s\n", snd_strerror(err)); return err; } if ((err = snd_pcm_sw_params_set_stop_threshold(pcm, swparams, (snd_pcm_uframes_t) -1)) < 0) { pa_log_warn("Unable to set stop threshold: %s\n", snd_strerror(err)); return err; } if ((err = snd_pcm_sw_params_set_start_threshold(pcm, swparams, (snd_pcm_uframes_t) -1)) < 0) { pa_log_warn("Unable to set start threshold: %s\n", snd_strerror(err)); return err; } if ((err = snd_pcm_sw_params_set_avail_min(pcm, swparams, avail_min)) < 0) { pa_log_error("snd_pcm_sw_params_set_avail_min() failed: %s", snd_strerror(err)); return err; } if ((err = snd_pcm_sw_params(pcm, swparams)) < 0) { pa_log_warn("Unable to set sw params: %s\n", snd_strerror(err)); return err; } return 0; } static const struct pa_alsa_profile_info device_table[] = { {{ 1, { PA_CHANNEL_POSITION_MONO }}, "hw", "Analog Mono", "analog-mono", 1 }, {{ 2, { PA_CHANNEL_POSITION_LEFT, PA_CHANNEL_POSITION_RIGHT }}, "front", "Analog Stereo", "analog-stereo", 10 }, {{ 2, { PA_CHANNEL_POSITION_LEFT, PA_CHANNEL_POSITION_RIGHT }}, "iec958", "IEC958 Digital Stereo", "iec958-stereo", 5 }, {{ 2, { PA_CHANNEL_POSITION_LEFT, PA_CHANNEL_POSITION_RIGHT }}, "hdmi", "HDMI Digital Stereo", "hdmi-stereo", 4 }, {{ 4, { PA_CHANNEL_POSITION_FRONT_LEFT, PA_CHANNEL_POSITION_FRONT_RIGHT, PA_CHANNEL_POSITION_REAR_LEFT, PA_CHANNEL_POSITION_REAR_RIGHT }}, "surround40", "Analog Surround 4.0", "analog-surround-40", 7 }, {{ 4, { PA_CHANNEL_POSITION_FRONT_LEFT, PA_CHANNEL_POSITION_FRONT_RIGHT, PA_CHANNEL_POSITION_REAR_LEFT, PA_CHANNEL_POSITION_REAR_RIGHT }}, "a52", "IEC958/AC3 Digital Surround 4.0", "iec958-ac3-surround-40", 2 }, {{ 5, { PA_CHANNEL_POSITION_FRONT_LEFT, PA_CHANNEL_POSITION_FRONT_RIGHT, PA_CHANNEL_POSITION_REAR_LEFT, PA_CHANNEL_POSITION_REAR_RIGHT, PA_CHANNEL_POSITION_LFE }}, "surround41", "Analog Surround 4.1", "analog-surround-41", 7 }, {{ 5, { PA_CHANNEL_POSITION_FRONT_LEFT, PA_CHANNEL_POSITION_FRONT_RIGHT, PA_CHANNEL_POSITION_REAR_LEFT, PA_CHANNEL_POSITION_REAR_RIGHT, PA_CHANNEL_POSITION_CENTER }}, "surround50", "Analog Surround 5.0", "analog-surround-50", 7 }, {{ 6, { PA_CHANNEL_POSITION_FRONT_LEFT, PA_CHANNEL_POSITION_FRONT_RIGHT, PA_CHANNEL_POSITION_REAR_LEFT, PA_CHANNEL_POSITION_REAR_RIGHT, PA_CHANNEL_POSITION_CENTER, PA_CHANNEL_POSITION_LFE }}, "surround51", "Analog Surround 5.1", "analog-surround-51", 8 }, {{ 6, { PA_CHANNEL_POSITION_FRONT_LEFT, PA_CHANNEL_POSITION_FRONT_CENTER, PA_CHANNEL_POSITION_FRONT_RIGHT, PA_CHANNEL_POSITION_REAR_LEFT, PA_CHANNEL_POSITION_REAR_RIGHT, PA_CHANNEL_POSITION_LFE}}, "a52", "IEC958/AC3 Digital Surround 5.1", "iec958-ac3-surround-51", 3 }, {{ 8, { PA_CHANNEL_POSITION_FRONT_LEFT, PA_CHANNEL_POSITION_FRONT_RIGHT, PA_CHANNEL_POSITION_REAR_LEFT, PA_CHANNEL_POSITION_REAR_RIGHT, PA_CHANNEL_POSITION_CENTER, PA_CHANNEL_POSITION_LFE, PA_CHANNEL_POSITION_SIDE_LEFT, PA_CHANNEL_POSITION_SIDE_RIGHT }}, "surround71", "Analog Surround 7.1", "analog-surround-71", 7 }, {{ 0, { 0 }}, NULL, NULL, NULL, 0 } }; snd_pcm_t *pa_alsa_open_by_device_id_auto( const char *dev_id, char **dev, pa_sample_spec *ss, pa_channel_map* map, int mode, uint32_t *nfrags, snd_pcm_uframes_t *period_size, snd_pcm_uframes_t tsched_size, pa_bool_t *use_mmap, pa_bool_t *use_tsched, const pa_alsa_profile_info **profile) { int i; int direction = 1; char *d; snd_pcm_t *pcm_handle; pa_assert(dev_id); pa_assert(dev); pa_assert(ss); pa_assert(map); pa_assert(nfrags); pa_assert(period_size); /* First we try to find a device string with a superset of the * requested channel map and open it without the plug: prefix. We * iterate through our device table from top to bottom and take * the first that matches. If we didn't find a working device that * way, we iterate backwards, and check all devices that do not * provide a superset of the requested channel map.*/ i = 0; for (;;) { if ((direction > 0) == pa_channel_map_superset(&device_table[i].map, map)) { pa_sample_spec try_ss; pa_log_debug("Checking for %s (%s)", device_table[i].name, device_table[i].alsa_name); d = pa_sprintf_malloc("%s:%s", device_table[i].alsa_name, dev_id); try_ss.channels = device_table[i].map.channels; try_ss.rate = ss->rate; try_ss.format = ss->format; pcm_handle = pa_alsa_open_by_device_string( d, dev, &try_ss, map, mode, nfrags, period_size, tsched_size, use_mmap, use_tsched, TRUE); pa_xfree(d); if (pcm_handle) { *ss = try_ss; *map = device_table[i].map; pa_assert(map->channels == ss->channels); if (profile) *profile = &device_table[i]; return pcm_handle; } } if (direction > 0) { if (!device_table[i+1].alsa_name) { /* OK, so we are at the end of our list. Let's turn * back. */ direction = -1; } else { /* We are not at the end of the list, so let's simply * try the next entry */ i++; } } if (direction < 0) { if (device_table[i+1].alsa_name && device_table[i].map.channels == device_table[i+1].map.channels) { /* OK, the next entry has the same number of channels, * let's try it */ i++; } else { /* Hmm, so the next entry does not have the same * number of channels, so let's go backwards until we * find the next entry with a differnt number of * channels */ for (i--; i >= 0; i--) if (device_table[i].map.channels != device_table[i+1].map.channels) break; /* Hmm, there is no entry with a different number of * entries, then we're done */ if (i < 0) break; /* OK, now lets find go back as long as we have the same number of channels */ for (; i > 0; i--) if (device_table[i].map.channels != device_table[i-1].map.channels) break; } } } /* OK, we didn't find any good device, so let's try the raw plughw: stuff */ d = pa_sprintf_malloc("hw:%s", dev_id); pa_log_debug("Trying %s as last resort...", d); pcm_handle = pa_alsa_open_by_device_string(d, dev, ss, map, mode, nfrags, period_size, tsched_size, use_mmap, use_tsched, FALSE); pa_xfree(d); if (pcm_handle && profile) *profile = NULL; return pcm_handle; } snd_pcm_t *pa_alsa_open_by_device_id_profile( const char *dev_id, char **dev, pa_sample_spec *ss, pa_channel_map* map, int mode, uint32_t *nfrags, snd_pcm_uframes_t *period_size, snd_pcm_uframes_t tsched_size, pa_bool_t *use_mmap, pa_bool_t *use_tsched, const pa_alsa_profile_info *profile) { char *d; snd_pcm_t *pcm_handle; pa_sample_spec try_ss; pa_assert(dev_id); pa_assert(dev); pa_assert(ss); pa_assert(map); pa_assert(nfrags); pa_assert(period_size); pa_assert(profile); d = pa_sprintf_malloc("%s:%s", profile->alsa_name, dev_id); try_ss.channels = profile->map.channels; try_ss.rate = ss->rate; try_ss.format = ss->format; pcm_handle = pa_alsa_open_by_device_string( d, dev, &try_ss, map, mode, nfrags, period_size, tsched_size, use_mmap, use_tsched, TRUE); pa_xfree(d); if (!pcm_handle) return NULL; *ss = try_ss; *map = profile->map; pa_assert(map->channels == ss->channels); return pcm_handle; } snd_pcm_t *pa_alsa_open_by_device_string( const char *device, char **dev, pa_sample_spec *ss, pa_channel_map* map, int mode, uint32_t *nfrags, snd_pcm_uframes_t *period_size, snd_pcm_uframes_t tsched_size, pa_bool_t *use_mmap, pa_bool_t *use_tsched, pa_bool_t require_exact_channel_number) { int err; char *d; snd_pcm_t *pcm_handle; pa_bool_t reformat = FALSE; pa_assert(device); pa_assert(ss); pa_assert(map); d = pa_xstrdup(device); for (;;) { pa_log_debug("Trying %s %s SND_PCM_NO_AUTO_FORMAT ...", d, reformat ? "without" : "with"); /* We don't pass SND_PCM_NONBLOCK here, since alsa-lib <= * 1.0.17a would then ignore the SND_PCM_NO_xxx flags. Instead * we enable nonblock mode afterwards via * snd_pcm_nonblock(). Also see * http://mailman.alsa-project.org/pipermail/alsa-devel/2008-August/010258.html */ if ((err = snd_pcm_open(&pcm_handle, d, mode, /*SND_PCM_NONBLOCK|*/ SND_PCM_NO_AUTO_RESAMPLE| SND_PCM_NO_AUTO_CHANNELS| (reformat ? 0 : SND_PCM_NO_AUTO_FORMAT))) < 0) { pa_log_info("Error opening PCM device %s: %s", d, snd_strerror(err)); goto fail; } if ((err = pa_alsa_set_hw_params(pcm_handle, ss, nfrags, period_size, tsched_size, use_mmap, use_tsched, require_exact_channel_number)) < 0) { if (!reformat) { reformat = TRUE; snd_pcm_close(pcm_handle); continue; } /* Hmm, some hw is very exotic, so we retry with plug, if without it didn't work */ if (!pa_startswith(d, "plug:") && !pa_startswith(d, "plughw:")) { char *t; t = pa_sprintf_malloc("plug:%s", d); pa_xfree(d); d = t; reformat = FALSE; snd_pcm_close(pcm_handle); continue; } pa_log_info("Failed to set hardware parameters on %s: %s", d, snd_strerror(err)); snd_pcm_close(pcm_handle); goto fail; } if (dev) *dev = d; else pa_xfree(d); if (ss->channels != map->channels) pa_channel_map_init_extend(map, ss->channels, PA_CHANNEL_MAP_ALSA); return pcm_handle; } fail: pa_xfree(d); return NULL; } int pa_alsa_probe_profiles( const char *dev_id, const pa_sample_spec *ss, void (*cb)(const pa_alsa_profile_info *sink, const pa_alsa_profile_info *source, void *userdata), void *userdata) { const pa_alsa_profile_info *i; pa_assert(dev_id); pa_assert(ss); pa_assert(cb); /* We try each combination of playback/capture. We also try to * open only for capture resp. only for sink. Don't get confused * by the trailing entry in device_table we use for this! */ for (i = device_table; i < device_table + PA_ELEMENTSOF(device_table); i++) { const pa_alsa_profile_info *j; snd_pcm_t *pcm_i = NULL; if (i->alsa_name) { char *id; pa_sample_spec try_ss; pa_channel_map try_map; pa_log_debug("Checking for playback on %s (%s)", i->name, i->alsa_name); id = pa_sprintf_malloc("%s:%s", i->alsa_name, dev_id); try_ss = *ss; try_ss.channels = i->map.channels; try_map = i->map; pcm_i = pa_alsa_open_by_device_string( id, NULL, &try_ss, &try_map, SND_PCM_STREAM_PLAYBACK, NULL, NULL, 0, NULL, NULL, TRUE); pa_xfree(id); if (!pcm_i) continue; } for (j = device_table; j < device_table + PA_ELEMENTSOF(device_table); j++) { snd_pcm_t *pcm_j = NULL; if (j->alsa_name) { char *jd; pa_sample_spec try_ss; pa_channel_map try_map; pa_log_debug("Checking for capture on %s (%s)", j->name, j->alsa_name); jd = pa_sprintf_malloc("%s:%s", j->alsa_name, dev_id); try_ss = *ss; try_ss.channels = j->map.channels; try_map = j->map; pcm_j = pa_alsa_open_by_device_string( jd, NULL, &try_ss, &try_map, SND_PCM_STREAM_CAPTURE, NULL, NULL, 0, NULL, NULL, TRUE); pa_xfree(jd); if (!pcm_j) continue; } if (pcm_j) snd_pcm_close(pcm_j); if (i->alsa_name || j->alsa_name) cb(i->alsa_name ? i : NULL, j->alsa_name ? j : NULL, userdata); } if (pcm_i) snd_pcm_close(pcm_i); } return TRUE; } int pa_alsa_prepare_mixer(snd_mixer_t *mixer, const char *dev) { int err; pa_assert(mixer); pa_assert(dev); if ((err = snd_mixer_attach(mixer, dev)) < 0) { pa_log_info("Unable to attach to mixer %s: %s", dev, snd_strerror(err)); return -1; } if ((err = snd_mixer_selem_register(mixer, NULL, NULL)) < 0) { pa_log_warn("Unable to register mixer: %s", snd_strerror(err)); return -1; } if ((err = snd_mixer_load(mixer)) < 0) { pa_log_warn("Unable to load mixer: %s", snd_strerror(err)); return -1; } pa_log_info("Successfully attached to mixer '%s'", dev); return 0; } static pa_bool_t elem_has_volume(snd_mixer_elem_t *elem, pa_bool_t playback) { pa_assert(elem); if (playback && snd_mixer_selem_has_playback_volume(elem)) return TRUE; if (!playback && snd_mixer_selem_has_capture_volume(elem)) return TRUE; return FALSE; } static pa_bool_t elem_has_switch(snd_mixer_elem_t *elem, pa_bool_t playback) { pa_assert(elem); if (playback && snd_mixer_selem_has_playback_switch(elem)) return TRUE; if (!playback && snd_mixer_selem_has_capture_switch(elem)) return TRUE; return FALSE; } snd_mixer_elem_t *pa_alsa_find_elem(snd_mixer_t *mixer, const char *name, const char *fallback, pa_bool_t playback) { snd_mixer_elem_t *elem = NULL, *fallback_elem = NULL; snd_mixer_selem_id_t *sid = NULL; snd_mixer_selem_id_alloca(&sid); pa_assert(mixer); pa_assert(name); snd_mixer_selem_id_set_name(sid, name); if ((elem = snd_mixer_find_selem(mixer, sid))) { if (elem_has_volume(elem, playback) && elem_has_switch(elem, playback)) goto success; if (!elem_has_volume(elem, playback) && !elem_has_switch(elem, playback)) elem = NULL; } pa_log_info("Cannot find mixer control \"%s\" or mixer control is no combination of switch/volume.", snd_mixer_selem_id_get_name(sid)); if (fallback) { snd_mixer_selem_id_set_name(sid, fallback); if ((fallback_elem = snd_mixer_find_selem(mixer, sid))) { if (elem_has_volume(fallback_elem, playback) && elem_has_switch(fallback_elem, playback)) { elem = fallback_elem; goto success; } if (!elem_has_volume(fallback_elem, playback) && !elem_has_switch(fallback_elem, playback)) fallback_elem = NULL; } pa_log_warn("Cannot find fallback mixer control \"%s\" or mixer control is no combination of switch/volume.", snd_mixer_selem_id_get_name(sid)); } if (elem && fallback_elem) { /* Hmm, so we have both elements, but neither has both mute * and volume. Let's prefer the one with the volume */ if (elem_has_volume(elem, playback)) goto success; if (elem_has_volume(fallback_elem, playback)) { elem = fallback_elem; goto success; } } if (!elem && fallback_elem) elem = fallback_elem; success: if (elem) pa_log_info("Using mixer control \"%s\".", snd_mixer_selem_id_get_name(sid)); return elem; } int pa_alsa_find_mixer_and_elem( snd_pcm_t *pcm, snd_mixer_t **_m, snd_mixer_elem_t **_e) { int err; snd_mixer_t *m; snd_mixer_elem_t *e; pa_bool_t found = FALSE; const char *dev; pa_assert(pcm); pa_assert(_m); pa_assert(_e); if ((err = snd_mixer_open(&m, 0)) < 0) { pa_log("Error opening mixer: %s", snd_strerror(err)); return -1; } /* First, try by name */ if ((dev = snd_pcm_name(pcm))) if (pa_alsa_prepare_mixer(m, dev) >= 0) found = TRUE; /* Then, try by card index */ if (!found) { snd_pcm_info_t* info; snd_pcm_info_alloca(&info); if (snd_pcm_info(pcm, info) >= 0) { char *md; int card_idx; if ((card_idx = snd_pcm_info_get_card(info)) >= 0) { md = pa_sprintf_malloc("hw:%i", card_idx); if (!dev || !pa_streq(dev, md)) if (pa_alsa_prepare_mixer(m, md) >= 0) found = TRUE; pa_xfree(md); } } } if (!found) { snd_mixer_close(m); return -1; } switch (snd_pcm_stream(pcm)) { case SND_PCM_STREAM_PLAYBACK: e = pa_alsa_find_elem(m, "Master", "PCM", TRUE); break; case SND_PCM_STREAM_CAPTURE: e = pa_alsa_find_elem(m, "Capture", "Mic", FALSE); break; default: pa_assert_not_reached(); } if (!e) { snd_mixer_close(m); return -1; } pa_assert(e && m); *_m = m; *_e = e; return 0; } static const snd_mixer_selem_channel_id_t alsa_channel_ids[PA_CHANNEL_POSITION_MAX] = { [PA_CHANNEL_POSITION_MONO] = SND_MIXER_SCHN_MONO, /* The ALSA name is just an alias! */ [PA_CHANNEL_POSITION_FRONT_CENTER] = SND_MIXER_SCHN_FRONT_CENTER, [PA_CHANNEL_POSITION_FRONT_LEFT] = SND_MIXER_SCHN_FRONT_LEFT, [PA_CHANNEL_POSITION_FRONT_RIGHT] = SND_MIXER_SCHN_FRONT_RIGHT, [PA_CHANNEL_POSITION_REAR_CENTER] = SND_MIXER_SCHN_REAR_CENTER, [PA_CHANNEL_POSITION_REAR_LEFT] = SND_MIXER_SCHN_REAR_LEFT, [PA_CHANNEL_POSITION_REAR_RIGHT] = SND_MIXER_SCHN_REAR_RIGHT, [PA_CHANNEL_POSITION_LFE] = SND_MIXER_SCHN_WOOFER, [PA_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER] = SND_MIXER_SCHN_UNKNOWN, [PA_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER] = SND_MIXER_SCHN_UNKNOWN, [PA_CHANNEL_POSITION_SIDE_LEFT] = SND_MIXER_SCHN_SIDE_LEFT, [PA_CHANNEL_POSITION_SIDE_RIGHT] = SND_MIXER_SCHN_SIDE_RIGHT, [PA_CHANNEL_POSITION_AUX0] = SND_MIXER_SCHN_UNKNOWN, [PA_CHANNEL_POSITION_AUX1] = SND_MIXER_SCHN_UNKNOWN, [PA_CHANNEL_POSITION_AUX2] = SND_MIXER_SCHN_UNKNOWN, [PA_CHANNEL_POSITION_AUX3] = SND_MIXER_SCHN_UNKNOWN, [PA_CHANNEL_POSITION_AUX4] = SND_MIXER_SCHN_UNKNOWN, [PA_CHANNEL_POSITION_AUX5] = SND_MIXER_SCHN_UNKNOWN, [PA_CHANNEL_POSITION_AUX6] = SND_MIXER_SCHN_UNKNOWN, [PA_CHANNEL_POSITION_AUX7] = SND_MIXER_SCHN_UNKNOWN, [PA_CHANNEL_POSITION_AUX8] = SND_MIXER_SCHN_UNKNOWN, [PA_CHANNEL_POSITION_AUX9] = SND_MIXER_SCHN_UNKNOWN, [PA_CHANNEL_POSITION_AUX10] = SND_MIXER_SCHN_UNKNOWN, [PA_CHANNEL_POSITION_AUX11] = SND_MIXER_SCHN_UNKNOWN, [PA_CHANNEL_POSITION_AUX12] = SND_MIXER_SCHN_UNKNOWN, [PA_CHANNEL_POSITION_AUX13] = SND_MIXER_SCHN_UNKNOWN, [PA_CHANNEL_POSITION_AUX14] = SND_MIXER_SCHN_UNKNOWN, [PA_CHANNEL_POSITION_AUX15] = SND_MIXER_SCHN_UNKNOWN, [PA_CHANNEL_POSITION_AUX16] = SND_MIXER_SCHN_UNKNOWN, [PA_CHANNEL_POSITION_AUX17] = SND_MIXER_SCHN_UNKNOWN, [PA_CHANNEL_POSITION_AUX18] = SND_MIXER_SCHN_UNKNOWN, [PA_CHANNEL_POSITION_AUX19] = SND_MIXER_SCHN_UNKNOWN, [PA_CHANNEL_POSITION_AUX20] = SND_MIXER_SCHN_UNKNOWN, [PA_CHANNEL_POSITION_AUX21] = SND_MIXER_SCHN_UNKNOWN, [PA_CHANNEL_POSITION_AUX22] = SND_MIXER_SCHN_UNKNOWN, [PA_CHANNEL_POSITION_AUX23] = SND_MIXER_SCHN_UNKNOWN, [PA_CHANNEL_POSITION_AUX24] = SND_MIXER_SCHN_UNKNOWN, [PA_CHANNEL_POSITION_AUX25] = SND_MIXER_SCHN_UNKNOWN, [PA_CHANNEL_POSITION_AUX26] = SND_MIXER_SCHN_UNKNOWN, [PA_CHANNEL_POSITION_AUX27] = SND_MIXER_SCHN_UNKNOWN, [PA_CHANNEL_POSITION_AUX28] = SND_MIXER_SCHN_UNKNOWN, [PA_CHANNEL_POSITION_AUX29] = SND_MIXER_SCHN_UNKNOWN, [PA_CHANNEL_POSITION_AUX30] = SND_MIXER_SCHN_UNKNOWN, [PA_CHANNEL_POSITION_AUX31] = SND_MIXER_SCHN_UNKNOWN, [PA_CHANNEL_POSITION_TOP_CENTER] = SND_MIXER_SCHN_UNKNOWN, [PA_CHANNEL_POSITION_TOP_FRONT_CENTER] = SND_MIXER_SCHN_UNKNOWN, [PA_CHANNEL_POSITION_TOP_FRONT_LEFT] = SND_MIXER_SCHN_UNKNOWN, [PA_CHANNEL_POSITION_TOP_FRONT_RIGHT] = SND_MIXER_SCHN_UNKNOWN, [PA_CHANNEL_POSITION_TOP_REAR_CENTER] = SND_MIXER_SCHN_UNKNOWN, [PA_CHANNEL_POSITION_TOP_REAR_LEFT] = SND_MIXER_SCHN_UNKNOWN, [PA_CHANNEL_POSITION_TOP_REAR_RIGHT] = SND_MIXER_SCHN_UNKNOWN }; int pa_alsa_calc_mixer_map(snd_mixer_elem_t *elem, const pa_channel_map *channel_map, snd_mixer_selem_channel_id_t mixer_map[], pa_bool_t playback) { unsigned i; pa_bool_t alsa_channel_used[SND_MIXER_SCHN_LAST]; pa_bool_t mono_used = FALSE; pa_assert(elem); pa_assert(channel_map); pa_assert(mixer_map); memset(&alsa_channel_used, 0, sizeof(alsa_channel_used)); if (channel_map->channels > 1 && ((playback && snd_mixer_selem_has_playback_volume_joined(elem)) || (!playback && snd_mixer_selem_has_capture_volume_joined(elem)))) { pa_log_info("ALSA device lacks independant volume controls for each channel."); return -1; } for (i = 0; i < channel_map->channels; i++) { snd_mixer_selem_channel_id_t id; pa_bool_t is_mono; is_mono = channel_map->map[i] == PA_CHANNEL_POSITION_MONO; id = alsa_channel_ids[channel_map->map[i]]; if (!is_mono && id == SND_MIXER_SCHN_UNKNOWN) { pa_log_info("Configured channel map contains channel '%s' that is unknown to the ALSA mixer.", pa_channel_position_to_string(channel_map->map[i])); return -1; } if ((is_mono && mono_used) || (!is_mono && alsa_channel_used[id])) { pa_log_info("Channel map has duplicate channel '%s', falling back to software volume control.", pa_channel_position_to_string(channel_map->map[i])); return -1; } if ((playback && (!snd_mixer_selem_has_playback_channel(elem, id) || (is_mono && !snd_mixer_selem_is_playback_mono(elem)))) || (!playback && (!snd_mixer_selem_has_capture_channel(elem, id) || (is_mono && !snd_mixer_selem_is_capture_mono(elem))))) { pa_log_info("ALSA device lacks separate volumes control for channel '%s'", pa_channel_position_to_string(channel_map->map[i])); return -1; } if (is_mono) { mixer_map[i] = SND_MIXER_SCHN_MONO; mono_used = TRUE; } else { mixer_map[i] = id; alsa_channel_used[id] = TRUE; } } pa_log_info("All %u channels can be mapped to mixer channels.", channel_map->channels); return 0; } void pa_alsa_dump(snd_pcm_t *pcm) { int err; snd_output_t *out; pa_assert(pcm); pa_assert_se(snd_output_buffer_open(&out) == 0); if ((err = snd_pcm_dump(pcm, out)) < 0) pa_log_debug("snd_pcm_dump(): %s", snd_strerror(err)); else { char *s = NULL; snd_output_buffer_string(out, &s); pa_log_debug("snd_pcm_dump():\n%s", pa_strnull(s)); } pa_assert_se(snd_output_close(out) == 0); } void pa_alsa_dump_status(snd_pcm_t *pcm) { int err; snd_output_t *out; snd_pcm_status_t *status; pa_assert(pcm); snd_pcm_status_alloca(&status); pa_assert_se(snd_output_buffer_open(&out) == 0); pa_assert_se(snd_pcm_status(pcm, status) == 0); if ((err = snd_pcm_status_dump(status, out)) < 0) pa_log_debug("snd_pcm_dump(): %s", snd_strerror(err)); else { char *s = NULL; snd_output_buffer_string(out, &s); pa_log_debug("snd_pcm_dump():\n%s", pa_strnull(s)); } pa_assert_se(snd_output_close(out) == 0); } static void alsa_error_handler(const char *file, int line, const char *function, int err, const char *fmt,...) { va_list ap; char *alsa_file; alsa_file = pa_sprintf_malloc("(alsa-lib)%s", file); va_start(ap, fmt); pa_log_levelv_meta(PA_LOG_INFO, alsa_file, line, function, fmt, ap); va_end(ap); pa_xfree(alsa_file); } static pa_atomic_t n_error_handler_installed = PA_ATOMIC_INIT(0); void pa_alsa_redirect_errors_inc(void) { /* This is not really thread safe, but we do our best */ if (pa_atomic_inc(&n_error_handler_installed) == 0) snd_lib_error_set_handler(alsa_error_handler); } void pa_alsa_redirect_errors_dec(void) { int r; pa_assert_se((r = pa_atomic_dec(&n_error_handler_installed)) >= 1); if (r == 1) snd_lib_error_set_handler(NULL); } void pa_alsa_init_proplist_card(pa_core *c, pa_proplist *p, int card) { char *cn, *lcn, *dn; pa_assert(p); pa_assert(card >= 0); pa_proplist_setf(p, "alsa.card", "%i", card); if (snd_card_get_name(card, &cn) >= 0) { pa_proplist_sets(p, "alsa.card_name", cn); free(cn); } if (snd_card_get_longname(card, &lcn) >= 0) { pa_proplist_sets(p, "alsa.long_card_name", lcn); free(lcn); } if ((dn = pa_alsa_get_driver_name(card))) { pa_proplist_sets(p, "alsa.driver_name", dn); pa_xfree(dn); } #ifdef HAVE_HAL pa_hal_get_info(c, p, card); #endif } void pa_alsa_init_proplist_pcm_info(pa_core *c, pa_proplist *p, snd_pcm_info_t *pcm_info) { static const char * const alsa_class_table[SND_PCM_CLASS_LAST+1] = { [SND_PCM_CLASS_GENERIC] = "generic", [SND_PCM_CLASS_MULTI] = "multi", [SND_PCM_CLASS_MODEM] = "modem", [SND_PCM_CLASS_DIGITIZER] = "digitizer" }; static const char * const class_table[SND_PCM_CLASS_LAST+1] = { [SND_PCM_CLASS_GENERIC] = "sound", [SND_PCM_CLASS_MULTI] = NULL, [SND_PCM_CLASS_MODEM] = "modem", [SND_PCM_CLASS_DIGITIZER] = NULL }; static const char * const alsa_subclass_table[SND_PCM_SUBCLASS_LAST+1] = { [SND_PCM_SUBCLASS_GENERIC_MIX] = "generic-mix", [SND_PCM_SUBCLASS_MULTI_MIX] = "multi-mix" }; snd_pcm_class_t class; snd_pcm_subclass_t subclass; const char *n, *id, *sdn, *cn; int card; pa_assert(p); pa_assert(pcm_info); pa_proplist_sets(p, PA_PROP_DEVICE_API, "alsa"); class = snd_pcm_info_get_class(pcm_info); if (class <= SND_PCM_CLASS_LAST) { if (class_table[class]) pa_proplist_sets(p, PA_PROP_DEVICE_CLASS, class_table[class]); if (alsa_class_table[class]) pa_proplist_sets(p, "alsa.class", alsa_class_table[class]); } subclass = snd_pcm_info_get_subclass(pcm_info); if (subclass <= SND_PCM_SUBCLASS_LAST) if (alsa_subclass_table[subclass]) pa_proplist_sets(p, "alsa.subclass", alsa_subclass_table[subclass]); if ((n = snd_pcm_info_get_name(pcm_info))) pa_proplist_sets(p, "alsa.name", n); if ((id = snd_pcm_info_get_id(pcm_info))) pa_proplist_sets(p, "alsa.id", id); pa_proplist_setf(p, "alsa.subdevice", "%u", snd_pcm_info_get_subdevice(pcm_info)); if ((sdn = snd_pcm_info_get_subdevice_name(pcm_info))) pa_proplist_sets(p, "alsa.subdevice_name", sdn); pa_proplist_setf(p, "alsa.device", "%u", snd_pcm_info_get_device(pcm_info)); if ((card = snd_pcm_info_get_card(pcm_info)) >= 0) { pa_alsa_init_proplist_card(c, p, card); cn = pa_proplist_gets(p, "alsa.card_name"); } if (cn && n) pa_proplist_setf(p, PA_PROP_DEVICE_DESCRIPTION, "%s - %s", cn, n); else if (cn) pa_proplist_sets(p, PA_PROP_DEVICE_DESCRIPTION, cn); else if (n) pa_proplist_sets(p, PA_PROP_DEVICE_DESCRIPTION, n); } void pa_alsa_init_proplist_pcm(pa_core *c, pa_proplist *p, snd_pcm_t *pcm) { snd_pcm_hw_params_t *hwparams; snd_pcm_info_t *info; int bits, err; snd_pcm_hw_params_alloca(&hwparams); snd_pcm_info_alloca(&info); if ((err = snd_pcm_hw_params_current(pcm, hwparams)) < 0) pa_log_warn("Error fetching hardware parameter info: %s", snd_strerror(err)); else { if ((bits = snd_pcm_hw_params_get_sbits(hwparams)) >= 0) pa_proplist_setf(p, "alsa.resolution_bits", "%i", bits); } if ((err = snd_pcm_info(pcm, info)) < 0) pa_log_warn("Error fetching PCM info: %s", snd_strerror(err)); else pa_alsa_init_proplist_pcm_info(c, p, info); } int pa_alsa_recover_from_poll(snd_pcm_t *pcm, int revents) { snd_pcm_state_t state; int err; pa_assert(pcm); if (revents & POLLERR) pa_log_debug("Got POLLERR from ALSA"); if (revents & POLLNVAL) pa_log_warn("Got POLLNVAL from ALSA"); if (revents & POLLHUP) pa_log_warn("Got POLLHUP from ALSA"); if (revents & POLLPRI) pa_log_warn("Got POLLPRI from ALSA"); if (revents & POLLIN) pa_log_debug("Got POLLIN from ALSA"); if (revents & POLLOUT) pa_log_debug("Got POLLOUT from ALSA"); state = snd_pcm_state(pcm); pa_log_debug("PCM state is %s", snd_pcm_state_name(state)); /* Try to recover from this error */ switch (state) { case SND_PCM_STATE_XRUN: if ((err = snd_pcm_recover(pcm, -EPIPE, 1)) != 0) { pa_log_warn("Could not recover from POLLERR|POLLNVAL|POLLHUP and XRUN: %s", snd_strerror(err)); return -1; } break; case SND_PCM_STATE_SUSPENDED: if ((err = snd_pcm_recover(pcm, -ESTRPIPE, 1)) != 0) { pa_log_warn("Could not recover from POLLERR|POLLNVAL|POLLHUP and SUSPENDED: %s", snd_strerror(err)); return -1; } break; default: snd_pcm_drop(pcm); if ((err = snd_pcm_prepare(pcm)) < 0) { pa_log_warn("Could not recover from POLLERR|POLLNVAL|POLLHUP with snd_pcm_prepare(): %s", snd_strerror(err)); return -1; } break; } return 0; } pa_rtpoll_item* pa_alsa_build_pollfd(snd_pcm_t *pcm, pa_rtpoll *rtpoll) { int n, err; struct pollfd *pollfd; pa_rtpoll_item *item; pa_assert(pcm); if ((n = snd_pcm_poll_descriptors_count(pcm)) < 0) { pa_log("snd_pcm_poll_descriptors_count() failed: %s", snd_strerror(n)); return NULL; } item = pa_rtpoll_item_new(rtpoll, PA_RTPOLL_NEVER, (unsigned) n); pollfd = pa_rtpoll_item_get_pollfd(item, NULL); if ((err = snd_pcm_poll_descriptors(pcm, pollfd, (unsigned) n)) < 0) { pa_log("snd_pcm_poll_descriptors() failed: %s", snd_strerror(err)); pa_rtpoll_item_free(item); return NULL; } return item; } snd_pcm_sframes_t pa_alsa_safe_avail_update(snd_pcm_t *pcm, size_t hwbuf_size, const pa_sample_spec *ss) { snd_pcm_sframes_t n; size_t k; pa_assert(pcm); pa_assert(hwbuf_size > 0); pa_assert(ss); /* Some ALSA driver expose weird bugs, let's inform the user about * what is going on */ n = snd_pcm_avail_update(pcm); if (n <= 0) return n; k = (size_t) n * pa_frame_size(ss); if (k >= hwbuf_size * 3 || k >= pa_bytes_per_second(ss)*10) pa_log("snd_pcm_avail_update() returned a value that is exceptionally large: %lu bytes (%lu ms). " "Most likely this is an ALSA driver bug. Please report this issue to the ALSA developers.", (unsigned long) k, (unsigned long) (pa_bytes_to_usec(k, ss) / PA_USEC_PER_MSEC)); return n; } int pa_alsa_safe_mmap_begin(snd_pcm_t *pcm, const snd_pcm_channel_area_t **areas, snd_pcm_uframes_t *offset, snd_pcm_uframes_t *frames, size_t hwbuf_size, const pa_sample_spec *ss) { int r; snd_pcm_uframes_t before; size_t k; pa_assert(pcm); pa_assert(areas); pa_assert(offset); pa_assert(frames); pa_assert(hwbuf_size > 0); pa_assert(ss); before = *frames; r = snd_pcm_mmap_begin(pcm, areas, offset, frames); if (r < 0) return r; k = (size_t) *frames * pa_frame_size(ss); if (*frames > before || k >= hwbuf_size * 3 || k >= pa_bytes_per_second(ss)*10) pa_log("snd_pcm_mmap_begin() returned a value that is exceptionally large: %lu bytes (%lu ms). " "Most likely this is an ALSA driver bug. Please report this issue to the ALSA developers.", (unsigned long) k, (unsigned long) (pa_bytes_to_usec(k, ss) / PA_USEC_PER_MSEC)); return r; } char *pa_alsa_get_driver_name(int card) { char *t, *m, *n; pa_assert(card >= 0); t = pa_sprintf_malloc("/sys/class/sound/card%i/device/driver/module", card); m = pa_readlink(t); pa_xfree(t); if (!m) return NULL; n = pa_xstrdup(pa_path_get_filename(m)); pa_xfree(m); return n; }