/*** 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 "alsa-util.h" 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, }; static const pa_sample_format_t try_order[] = { PA_SAMPLE_FLOAT32NE, PA_SAMPLE_FLOAT32RE, PA_SAMPLE_S32NE, PA_SAMPLE_S32RE, 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_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; unsigned int _periods = *periods; 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); pa_assert(periods); pa_assert(period_size); 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 ((ret = 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; /* 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 (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 (_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 ((ret = snd_pcm_hw_params_set_periods_integer(pcm_handle, hwparams)) < 0) goto finish; 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_warn("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_warn("Device %s doesn't support %u channels, changed to %u.", snd_pcm_name(pcm_handle), ss->channels, c); if (ss->format != f) pa_log_warn("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); *periods = _periods; *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; } struct device_info { pa_channel_map map; const char *name; }; static const struct device_info device_table[] = { {{ 2, { PA_CHANNEL_POSITION_LEFT, PA_CHANNEL_POSITION_RIGHT } }, "front" }, {{ 4, { PA_CHANNEL_POSITION_FRONT_LEFT, PA_CHANNEL_POSITION_FRONT_RIGHT, PA_CHANNEL_POSITION_REAR_LEFT, PA_CHANNEL_POSITION_REAR_RIGHT }}, "surround40" }, {{ 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" }, {{ 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" }, {{ 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" }, {{ 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" }, {{ 0, { 0 }}, NULL } }; static pa_bool_t channel_map_superset(const pa_channel_map *a, const pa_channel_map *b) { pa_bool_t in_a[PA_CHANNEL_POSITION_MAX]; unsigned i; pa_assert(a); pa_assert(b); memset(in_a, 0, sizeof(in_a)); for (i = 0; i < a->channels; i++) in_a[a->map[i]] = TRUE; for (i = 0; i < b->channels; i++) if (!in_a[b->map[i]]) return FALSE; return TRUE; } snd_pcm_t *pa_alsa_open_by_device_id( 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) { int i; int direction = 1; int err; 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.*/ for (i = 0;; i += direction) { pa_sample_spec try_ss; if (i < 0) { pa_assert(direction == -1); /* OK, so we iterated backwards, and now are at the * beginning of our list. */ break; } else if (!device_table[i].name) { pa_assert(direction == 1); /* OK, so we are at the end of our list. at iterated * forwards. */ i--; direction = -1; } if ((direction > 0) == !channel_map_superset(&device_table[i].map, map)) continue; d = pa_sprintf_malloc("%s:%s", device_table[i].name, dev_id); for (;;) { pa_log_debug("Trying %s...", d); /* 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| SND_PCM_NO_AUTO_FORMAT)) < 0) { pa_log_info("Couldn't open PCM device %s: %s", d, snd_strerror(err)); break; } try_ss.channels = device_table[i].map.channels; try_ss.rate = ss->rate; try_ss.format = ss->format; if ((err = pa_alsa_set_hw_params(pcm_handle, &try_ss, nfrags, period_size, tsched_size, use_mmap, use_tsched, TRUE)) < 0) { if (!pa_startswith(d, "plug:") && !pa_startswith(d, "plughw:")) { char *t; t = pa_sprintf_malloc("plug:%s", d); pa_xfree(d); d = t; snd_pcm_close(pcm_handle); continue; } pa_log_info("PCM device %s refused our hw parameters: %s", d, snd_strerror(err)); snd_pcm_close(pcm_handle); break; } *ss = try_ss; *map = device_table[i].map; pa_assert(map->channels == ss->channels); *dev = d; return pcm_handle; } pa_xfree(d); } /* 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); pa_xfree(d); 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) { int err; char *d; snd_pcm_t *pcm_handle; pa_assert(device); pa_assert(dev); pa_assert(ss); pa_assert(map); pa_assert(nfrags); pa_assert(period_size); d = pa_xstrdup(device); for (;;) { pa_log_debug("Trying %s...", d); /* 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| SND_PCM_NO_AUTO_FORMAT)) < 0) { pa_log("Error opening PCM device %s: %s", d, snd_strerror(err)); pa_xfree(d); return NULL; } if ((err = pa_alsa_set_hw_params(pcm_handle, ss, nfrags, period_size, tsched_size, use_mmap, use_tsched, FALSE)) < 0) { /* 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; snd_pcm_close(pcm_handle); continue; } pa_log("Failed to set hardware parameters on %s: %s", d, snd_strerror(err)); pa_xfree(d); snd_pcm_close(pcm_handle); return NULL; } *dev = d; if (ss->channels != map->channels) pa_channel_map_init_extend(map, ss->channels, PA_CHANNEL_MAP_ALSA); return pcm_handle; } } 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; } snd_mixer_elem_t *pa_alsa_find_elem(snd_mixer_t *mixer, const char *name, const char *fallback) { snd_mixer_elem_t *elem; 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))) { pa_log_info("Cannot find mixer control \"%s\".", snd_mixer_selem_id_get_name(sid)); if (fallback) { snd_mixer_selem_id_set_name(sid, fallback); if (!(elem = snd_mixer_find_selem(mixer, sid))) pa_log_warn("Cannot find fallback mixer control \"%s\".", snd_mixer_selem_id_get_name(sid)); } } if (elem) pa_log_info("Using mixer control \"%s\".", snd_mixer_selem_id_get_name(sid)); return elem; } 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(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; char *cn = NULL, *lcn = NULL; 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_proplist_setf(p, "alsa.card", "%i", card); if (snd_card_get_name(card, &cn) >= 0) pa_proplist_sets(p, "alsa.card_name", cn); if (snd_card_get_longname(card, &lcn) >= 0) pa_proplist_sets(p, "alsa.long_card_name", lcn); } 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); free(lcn); free(cn); } 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_warn("Got POLLERR from ALSA"); if (revents & POLLNVAL) pa_log_warn("Got POLLNVAL from ALSA"); if (revents & POLLHUP) pa_log_warn("Got POLLHUP from ALSA"); state = snd_pcm_state(pcm); pa_log_warn("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; }