/* $Id$ */ /*** 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 "alsa-util.h" struct pa_alsa_fdlist { int 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; int polled; void (*cb)(void *userdata); void *userdata; }; static void io_cb(pa_mainloop_api*a, pa_io_event* e, PA_GCC_UNUSED int fd, pa_io_event_flags_t events, void *userdata) { struct pa_alsa_fdlist *fdl = userdata; int err, 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 = 1; 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_GCC_UNUSED pa_defer_event* e, void *userdata) { struct pa_alsa_fdlist *fdl = userdata; int num_fds, i, err; struct pollfd *temp; pa_assert(a); pa_assert(fdl); pa_assert(fdl->mixer); a->defer_enable(fdl->defer, 0); num_fds = snd_mixer_poll_descriptors_count(fdl->mixer); pa_assert(num_fds > 0); 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 = 0; 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 = 0; 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) { int 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, pa_bool_t *use_mmap, pa_bool_t require_exact_channel_number) { int ret = -1; 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_assert(pcm_handle); pa_assert(ss); pa_assert(periods); pa_assert(period_size); snd_pcm_hw_params_alloca(&hwparams); buffer_size = *periods * *period_size; 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 ((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 ((*period_size > 0 && (ret = snd_pcm_hw_params_set_period_size_near(pcm_handle, hwparams, period_size, NULL)) < 0) || (*periods > 0 && (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_buffer_size(hwparams, &buffer_size)) < 0 || (ret = snd_pcm_hw_params_get_period_size(hwparams, period_size, NULL)) < 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 = c; ss->format = f; pa_assert(buffer_size > 0); pa_assert(*period_size > 0); *periods = buffer_size / *period_size; pa_assert(*periods > 0); if (use_mmap) *use_mmap = _use_mmap; ret = 0; finish: return ret; } int pa_alsa_set_sw_params(snd_pcm_t *pcm) { 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(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, pa_bool_t *use_mmap) { 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); pa_log_debug("Trying %s...", d); if ((err = snd_pcm_open(&pcm_handle, d, mode, SND_PCM_NONBLOCK)) < 0) { pa_log_info("Couldn't open PCM device %s: %s", d, snd_strerror(err)); pa_xfree(d); continue; } 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, use_mmap, TRUE)) < 0) { pa_log_info("PCM device %s refused our hw parameters: %s", d, snd_strerror(err)); pa_xfree(d); snd_pcm_close(pcm_handle); continue; } *ss = try_ss; *map = device_table[i].map; pa_assert(map->channels == ss->channels); *dev = d; return pcm_handle; } /* OK, we didn't find any good device, so let's try the raw hw: 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, use_mmap); 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, pa_bool_t *use_mmap) { 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 (;;) { if ((err = snd_pcm_open(&pcm_handle, d, mode, SND_PCM_NONBLOCK)) < 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, use_mmap, FALSE)) < 0) { if (err == -EPERM) { /* Hmm, some hw is very exotic, so we retry with plug, if without it didn't work */ if (pa_startswith(d, "hw:")) { char *t = pa_sprintf_malloc("plughw:%s", d+3); pa_log_debug("Opening the device as '%s' didn't work, retrying with '%s'.", d, t); 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_auto(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, falling back to software volume control."); 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. Falling back to software volume control.", 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', failling 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', falling back to software volume control.", 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. Using hardware volume control.", channel_map->channels); return 0; }