/*** This file is part of PulseAudio. Copyright 2004-2009 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 2.1 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, see . ***/ #ifdef HAVE_CONFIG_H #include #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "alsa-util.h" #include "alsa-mixer.h" #ifdef HAVE_UDEV #include #endif 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 }; unsigned i; int ret; pa_assert(pcm_handle); pa_assert(hwparams); pa_assert(f); if ((ret = snd_pcm_hw_params_set_format(pcm_handle, hwparams, format_trans[*f])) >= 0) return ret; pa_log_debug("snd_pcm_hw_params_set_format(%s) failed: %s", snd_pcm_format_description(format_trans[*f]), pa_alsa_strerror(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; pa_log_debug("snd_pcm_hw_params_set_format(%s) failed: %s", snd_pcm_format_description(format_trans[*f]), pa_alsa_strerror(ret)); try_auto: for (i = 0; i < PA_ELEMENTSOF(try_order); i++) { *f = try_order[i]; if ((ret = snd_pcm_hw_params_set_format(pcm_handle, hwparams, format_trans[*f])) >= 0) return ret; pa_log_debug("snd_pcm_hw_params_set_format(%s) failed: %s", snd_pcm_format_description(format_trans[*f]), pa_alsa_strerror(ret)); } return -1; } static int set_period_size(snd_pcm_t *pcm_handle, snd_pcm_hw_params_t *hwparams, snd_pcm_uframes_t size) { snd_pcm_uframes_t s; int d, ret; pa_assert(pcm_handle); pa_assert(hwparams); s = size; d = 0; if (snd_pcm_hw_params_set_period_size_near(pcm_handle, hwparams, &s, &d) < 0) { s = size; d = -1; if (snd_pcm_hw_params_set_period_size_near(pcm_handle, hwparams, &s, &d) < 0) { s = size; d = 1; if ((ret = snd_pcm_hw_params_set_period_size_near(pcm_handle, hwparams, &s, &d)) < 0) { pa_log_info("snd_pcm_hw_params_set_period_size_near() failed: %s", pa_alsa_strerror(ret)); return ret; } } } return 0; } static int set_buffer_size(snd_pcm_t *pcm_handle, snd_pcm_hw_params_t *hwparams, snd_pcm_uframes_t size) { int ret; pa_assert(pcm_handle); pa_assert(hwparams); if ((ret = snd_pcm_hw_params_set_buffer_size_near(pcm_handle, hwparams, &size)) < 0) { pa_log_info("snd_pcm_hw_params_set_buffer_size_near() failed: %s", pa_alsa_strerror(ret)); return ret; } return 0; } static void check_access(snd_pcm_t *pcm_handle, snd_pcm_hw_params_t *hwparams, bool use_mmap) { if ((use_mmap && !snd_pcm_hw_params_test_access(pcm_handle, hwparams, SND_PCM_ACCESS_MMAP_INTERLEAVED)) || !snd_pcm_hw_params_test_access(pcm_handle, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED)) pa_log_error("Weird, PCM claims to support interleaved access, but snd_pcm_hw_params_set_access() failed."); if ((use_mmap && !snd_pcm_hw_params_test_access(pcm_handle, hwparams, SND_PCM_ACCESS_MMAP_NONINTERLEAVED)) || !snd_pcm_hw_params_test_access(pcm_handle, hwparams, SND_PCM_ACCESS_RW_NONINTERLEAVED)) pa_log_debug("PCM seems to support non-interleaved access, but PA doesn't."); else if (use_mmap && !snd_pcm_hw_params_test_access(pcm_handle, hwparams, SND_PCM_ACCESS_MMAP_COMPLEX)) { pa_log_debug("PCM seems to support mmapped complex access, but PA doesn't."); } } /* Set the hardware parameters of the given ALSA device. Returns the * selected fragment settings in *buffer_size and *period_size. Determine * whether mmap and tsched mode can be enabled. */ int pa_alsa_set_hw_params( snd_pcm_t *pcm_handle, pa_sample_spec *ss, snd_pcm_uframes_t *period_size, snd_pcm_uframes_t *buffer_size, snd_pcm_uframes_t tsched_size, bool *use_mmap, bool *use_tsched, bool require_exact_channel_number) { int ret = -1; snd_pcm_hw_params_t *hwparams, *hwparams_copy; int dir; snd_pcm_uframes_t _period_size = period_size ? *period_size : 0; snd_pcm_uframes_t _buffer_size = buffer_size ? *buffer_size : 0; bool _use_mmap = use_mmap && *use_mmap; bool _use_tsched = use_tsched && *use_tsched; pa_sample_spec _ss = *ss; pa_assert(pcm_handle); pa_assert(ss); snd_pcm_hw_params_alloca(&hwparams); snd_pcm_hw_params_alloca(&hwparams_copy); if ((ret = snd_pcm_hw_params_any(pcm_handle, hwparams)) < 0) { pa_log_debug("snd_pcm_hw_params_any() failed: %s", pa_alsa_strerror(ret)); goto finish; } if ((ret = snd_pcm_hw_params_set_rate_resample(pcm_handle, hwparams, 0)) < 0) { pa_log_debug("snd_pcm_hw_params_set_rate_resample() failed: %s", pa_alsa_strerror(ret)); 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) { pa_log_debug("snd_pcm_hw_params_set_access() failed: %s", pa_alsa_strerror(ret)); check_access(pcm_handle, hwparams, true); goto finish; } _use_mmap = false; } } else if ((ret = snd_pcm_hw_params_set_access(pcm_handle, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED)) < 0) { pa_log_debug("snd_pcm_hw_params_set_access() failed: %s", pa_alsa_strerror(ret)); check_access(pcm_handle, hwparams, false); goto finish; } if (!_use_mmap) _use_tsched = false; if (!pa_alsa_pcm_is_hw(pcm_handle)) _use_tsched = false; /* The PCM pointer is only updated with period granularity */ if (snd_pcm_hw_params_is_batch(hwparams)) { bool is_usb = false; const char *id; snd_pcm_info_t* pcm_info; snd_pcm_info_alloca(&pcm_info); if (snd_pcm_info(pcm_handle, pcm_info) == 0 && (id = snd_pcm_info_get_id(pcm_info))) { /* This horrible hack makes sure we don't disable tsched on USB * devices, which have a low enough transfer size for timer-based * scheduling to work. This can go away when the ALSA API supprots * querying the block transfer size. */ if (pa_streq(id, "USB Audio")) is_usb = true; } if (!is_usb) { pa_log_info("Disabling tsched mode since BATCH flag is set"); _use_tsched = false; } } #if (SND_LIB_VERSION >= ((1<<16)|(0<<8)|24)) /* API additions in 1.0.24 */ if (_use_tsched) { /* try to disable period wakeups if hardware can do so */ if (snd_pcm_hw_params_can_disable_period_wakeup(hwparams)) { if ((ret = snd_pcm_hw_params_set_period_wakeup(pcm_handle, hwparams, false)) < 0) /* don't bail, keep going with default mode with period wakeups */ pa_log_debug("snd_pcm_hw_params_set_period_wakeup() failed: %s", pa_alsa_strerror(ret)); else pa_log_info("Trying to disable ALSA period wakeups, using timers only"); } else pa_log_info("Cannot disable ALSA period wakeups"); } #endif if ((ret = set_format(pcm_handle, hwparams, &_ss.format)) < 0) goto finish; if ((ret = snd_pcm_hw_params_set_rate_near(pcm_handle, hwparams, &_ss.rate, NULL)) < 0) { pa_log_debug("snd_pcm_hw_params_set_rate_near() failed: %s", pa_alsa_strerror(ret)); goto finish; } /* We ignore very small sampling rate deviations */ if (_ss.rate >= ss->rate*.95 && _ss.rate <= ss->rate*1.05) _ss.rate = ss->rate; if (require_exact_channel_number) { if ((ret = snd_pcm_hw_params_set_channels(pcm_handle, hwparams, _ss.channels)) < 0) { pa_log_debug("snd_pcm_hw_params_set_channels(%u) failed: %s", _ss.channels, pa_alsa_strerror(ret)); goto finish; } } else { unsigned int c = _ss.channels; if ((ret = snd_pcm_hw_params_set_channels_near(pcm_handle, hwparams, &c)) < 0) { pa_log_debug("snd_pcm_hw_params_set_channels_near(%u) failed: %s", _ss.channels, pa_alsa_strerror(ret)); goto finish; } _ss.channels = c; } if (_use_tsched && tsched_size > 0) { _buffer_size = (snd_pcm_uframes_t) (((uint64_t) tsched_size * _ss.rate) / ss->rate); _period_size = _buffer_size; } else { _period_size = (snd_pcm_uframes_t) (((uint64_t) _period_size * _ss.rate) / ss->rate); _buffer_size = (snd_pcm_uframes_t) (((uint64_t) _buffer_size * _ss.rate) / ss->rate); } if (_buffer_size > 0 || _period_size > 0) { snd_pcm_uframes_t max_frames = 0; if ((ret = snd_pcm_hw_params_get_buffer_size_max(hwparams, &max_frames)) < 0) pa_log_warn("snd_pcm_hw_params_get_buffer_size_max() failed: %s", pa_alsa_strerror(ret)); else pa_log_debug("Maximum hw buffer size is %lu ms", (long unsigned) (max_frames * PA_MSEC_PER_SEC / _ss.rate)); /* Some ALSA drivers really don't like if we set the buffer * size first and the number of periods second (which would * make a lot more sense to me). So, try a few combinations * before we give up. */ if (_buffer_size > 0 && _period_size > 0) { snd_pcm_hw_params_copy(hwparams_copy, hwparams); /* First try: set buffer size first, followed by period size */ if (set_buffer_size(pcm_handle, hwparams_copy, _buffer_size) >= 0 && set_period_size(pcm_handle, hwparams_copy, _period_size) >= 0 && snd_pcm_hw_params(pcm_handle, hwparams_copy) >= 0) { pa_log_debug("Set buffer size first (to %lu samples), period size second (to %lu samples).", (unsigned long) _buffer_size, (unsigned long) _period_size); goto success; } snd_pcm_hw_params_copy(hwparams_copy, hwparams); /* Second try: set period size first, followed by buffer size */ if (set_period_size(pcm_handle, hwparams_copy, _period_size) >= 0 && set_buffer_size(pcm_handle, hwparams_copy, _buffer_size) >= 0 && snd_pcm_hw_params(pcm_handle, hwparams_copy) >= 0) { pa_log_debug("Set period size first (to %lu samples), buffer size second (to %lu samples).", (unsigned long) _period_size, (unsigned long) _buffer_size); goto success; } } if (_buffer_size > 0) { snd_pcm_hw_params_copy(hwparams_copy, hwparams); /* Third try: set only buffer size */ if (set_buffer_size(pcm_handle, hwparams_copy, _buffer_size) >= 0 && snd_pcm_hw_params(pcm_handle, hwparams_copy) >= 0) { pa_log_debug("Set only buffer size (to %lu samples).", (unsigned long) _buffer_size); goto success; } } if (_period_size > 0) { snd_pcm_hw_params_copy(hwparams_copy, hwparams); /* Fourth try: set only period size */ if (set_period_size(pcm_handle, hwparams_copy, _period_size) >= 0 && snd_pcm_hw_params(pcm_handle, hwparams_copy) >= 0) { pa_log_debug("Set only period size (to %lu samples).", (unsigned long) _period_size); goto success; } } } pa_log_debug("Set neither period nor buffer size."); /* Last chance, set nothing */ if ((ret = snd_pcm_hw_params(pcm_handle, hwparams)) < 0) { pa_log_info("snd_pcm_hw_params failed: %s", pa_alsa_strerror(ret)); goto finish; } success: if (ss->rate != _ss.rate) pa_log_info("Device %s doesn't support %u Hz, changed to %u Hz.", snd_pcm_name(pcm_handle), ss->rate, _ss.rate); if (ss->channels != _ss.channels) pa_log_info("Device %s doesn't support %u channels, changed to %u.", snd_pcm_name(pcm_handle), ss->channels, _ss.channels); if (ss->format != _ss.format) 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(_ss.format)); if ((ret = snd_pcm_hw_params_current(pcm_handle, hwparams)) < 0) { pa_log_info("snd_pcm_hw_params_current() failed: %s", pa_alsa_strerror(ret)); goto finish; } if ((ret = snd_pcm_hw_params_get_period_size(hwparams, &_period_size, &dir)) < 0 || (ret = snd_pcm_hw_params_get_buffer_size(hwparams, &_buffer_size)) < 0) { pa_log_info("snd_pcm_hw_params_get_{period|buffer}_size() failed: %s", pa_alsa_strerror(ret)); goto finish; } #if (SND_LIB_VERSION >= ((1<<16)|(0<<8)|24)) /* API additions in 1.0.24 */ if (_use_tsched) { unsigned int no_wakeup; /* see if period wakeups were disabled */ snd_pcm_hw_params_get_period_wakeup(pcm_handle, hwparams, &no_wakeup); if (no_wakeup == 0) pa_log_info("ALSA period wakeups disabled"); else pa_log_info("ALSA period wakeups were not disabled"); } #endif ss->rate = _ss.rate; ss->channels = _ss.channels; ss->format = _ss.format; pa_assert(_period_size > 0); pa_assert(_buffer_size > 0); if (buffer_size) *buffer_size = _buffer_size; if (period_size) *period_size = _period_size; if (use_mmap) *use_mmap = _use_mmap; if (use_tsched) *use_tsched = _use_tsched; ret = 0; finish: return ret; } int pa_alsa_set_sw_params(snd_pcm_t *pcm, snd_pcm_uframes_t avail_min, bool period_event) { snd_pcm_sw_params_t *swparams; snd_pcm_uframes_t boundary; 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", pa_alsa_strerror(err)); return err; } if ((err = snd_pcm_sw_params_set_period_event(pcm, swparams, period_event)) < 0) { pa_log_warn("Unable to disable period event: %s", pa_alsa_strerror(err)); return err; } if ((err = snd_pcm_sw_params_set_tstamp_mode(pcm, swparams, SND_PCM_TSTAMP_ENABLE)) < 0) { pa_log_warn("Unable to enable time stamping: %s", pa_alsa_strerror(err)); return err; } if ((err = snd_pcm_sw_params_get_boundary(swparams, &boundary)) < 0) { pa_log_warn("Unable to get boundary: %s", pa_alsa_strerror(err)); return err; } if ((err = snd_pcm_sw_params_set_stop_threshold(pcm, swparams, boundary)) < 0) { pa_log_warn("Unable to set stop threshold: %s", pa_alsa_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", pa_alsa_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", pa_alsa_strerror(err)); return err; } if ((err = snd_pcm_sw_params(pcm, swparams)) < 0) { pa_log_warn("Unable to set sw params: %s", pa_alsa_strerror(err)); return err; } return 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, snd_pcm_uframes_t *period_size, snd_pcm_uframes_t *buffer_size, snd_pcm_uframes_t tsched_size, bool *use_mmap, bool *use_tsched, pa_alsa_profile_set *ps, pa_alsa_mapping **mapping) { char *d; snd_pcm_t *pcm_handle; void *state; pa_alsa_mapping *m; pa_assert(dev_id); pa_assert(dev); pa_assert(ss); pa_assert(map); pa_assert(ps); /* First we try to find a device string with a superset of the * requested channel map. 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.*/ PA_HASHMAP_FOREACH(m, ps->mappings, state) { if (!pa_channel_map_superset(&m->channel_map, map)) continue; pa_log_debug("Checking for superset %s (%s)", m->name, m->device_strings[0]); pcm_handle = pa_alsa_open_by_device_id_mapping( dev_id, dev, ss, map, mode, period_size, buffer_size, tsched_size, use_mmap, use_tsched, m); if (pcm_handle) { if (mapping) *mapping = m; return pcm_handle; } } PA_HASHMAP_FOREACH_BACKWARDS(m, ps->mappings, state) { if (pa_channel_map_superset(&m->channel_map, map)) continue; pa_log_debug("Checking for subset %s (%s)", m->name, m->device_strings[0]); pcm_handle = pa_alsa_open_by_device_id_mapping( dev_id, dev, ss, map, mode, period_size, buffer_size, tsched_size, use_mmap, use_tsched, m); if (pcm_handle) { if (mapping) *mapping = m; 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, period_size, buffer_size, tsched_size, use_mmap, use_tsched, false); pa_xfree(d); if (pcm_handle && mapping) *mapping = NULL; return pcm_handle; } snd_pcm_t *pa_alsa_open_by_device_id_mapping( const char *dev_id, char **dev, pa_sample_spec *ss, pa_channel_map* map, int mode, snd_pcm_uframes_t *period_size, snd_pcm_uframes_t *buffer_size, snd_pcm_uframes_t tsched_size, bool *use_mmap, bool *use_tsched, pa_alsa_mapping *m) { snd_pcm_t *pcm_handle; pa_sample_spec try_ss; pa_channel_map try_map; pa_assert(dev_id); pa_assert(dev); pa_assert(ss); pa_assert(map); pa_assert(m); try_ss.channels = m->channel_map.channels; try_ss.rate = ss->rate; try_ss.format = ss->format; try_map = m->channel_map; pcm_handle = pa_alsa_open_by_template( m->device_strings, dev_id, dev, &try_ss, &try_map, mode, period_size, buffer_size, tsched_size, use_mmap, use_tsched, pa_channel_map_valid(&m->channel_map) /* Query the channel count if we don't know what we want */); if (!pcm_handle) return NULL; *ss = try_ss; *map = try_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, snd_pcm_uframes_t *period_size, snd_pcm_uframes_t *buffer_size, snd_pcm_uframes_t tsched_size, bool *use_mmap, bool *use_tsched, bool require_exact_channel_number) { int err; char *d; snd_pcm_t *pcm_handle; bool 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"); 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, pa_alsa_strerror(err)); goto fail; } pa_log_debug("Managed to open %s", d); if ((err = pa_alsa_set_hw_params( pcm_handle, ss, period_size, buffer_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, pa_alsa_strerror(err)); snd_pcm_close(pcm_handle); goto fail; } if (ss->channels > PA_CHANNELS_MAX) { pa_log("Device %s has %u channels, but PulseAudio supports only %u channels. Unable to use the device.", d, ss->channels, PA_CHANNELS_MAX); 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; } snd_pcm_t *pa_alsa_open_by_template( char **template, const char *dev_id, char **dev, pa_sample_spec *ss, pa_channel_map* map, int mode, snd_pcm_uframes_t *period_size, snd_pcm_uframes_t *buffer_size, snd_pcm_uframes_t tsched_size, bool *use_mmap, bool *use_tsched, bool require_exact_channel_number) { snd_pcm_t *pcm_handle; char **i; for (i = template; *i; i++) { char *d; d = pa_replace(*i, "%f", dev_id); pcm_handle = pa_alsa_open_by_device_string( d, dev, ss, map, mode, period_size, buffer_size, tsched_size, use_mmap, use_tsched, require_exact_channel_number); pa_xfree(d); if (pcm_handle) return pcm_handle; } return NULL; } void pa_alsa_dump(pa_log_level_t level, 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_logl(level, "snd_pcm_dump(): %s", pa_alsa_strerror(err)); else { char *s = NULL; snd_output_buffer_string(out, &s); pa_logl(level, "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; char *s = NULL; pa_assert(pcm); snd_pcm_status_alloca(&status); if ((err = snd_output_buffer_open(&out)) < 0) { pa_log_debug("snd_output_buffer_open() failed: %s", pa_cstrerror(err)); return; } if ((err = snd_pcm_status(pcm, status)) < 0) { pa_log_debug("snd_pcm_status() failed: %s", pa_cstrerror(err)); goto finish; } if ((err = snd_pcm_status_dump(status, out)) < 0) { pa_log_debug("snd_pcm_status_dump(): %s", pa_alsa_strerror(err)); goto finish; } snd_output_buffer_string(out, &s); pa_log_debug("snd_pcm_status_dump():\n%s", pa_strnull(s)); finish: snd_output_close(out); } 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_refcnt_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_refcnt_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); snd_config_update_free_global(); } } bool pa_alsa_init_description(pa_proplist *p, pa_card *card) { const char *d, *k; pa_assert(p); if (pa_device_init_description(p, card)) return true; if (!(d = pa_proplist_gets(p, "alsa.card_name"))) d = pa_proplist_gets(p, "alsa.name"); if (!d) return false; k = pa_proplist_gets(p, PA_PROP_DEVICE_PROFILE_DESCRIPTION); if (d && k) pa_proplist_setf(p, PA_PROP_DEVICE_DESCRIPTION, "%s %s", d, k); else if (d) pa_proplist_sets(p, PA_PROP_DEVICE_DESCRIPTION, d); return false; } 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", pa_strip(cn)); free(cn); } if (snd_card_get_longname(card, &lcn) >= 0) { pa_proplist_sets(p, "alsa.long_card_name", pa_strip(lcn)); free(lcn); } if ((dn = pa_alsa_get_driver_name(card))) { pa_proplist_sets(p, "alsa.driver_name", dn); pa_xfree(dn); } #ifdef HAVE_UDEV pa_udev_get_info(card, p); #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; int card; pa_assert(p); pa_assert(pcm_info); pa_proplist_sets(p, PA_PROP_DEVICE_API, "alsa"); if ((class = snd_pcm_info_get_class(pcm_info)) <= 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]); } if ((subclass = snd_pcm_info_get_subclass(pcm_info)) <= 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))) { char *t = pa_xstrdup(n); pa_proplist_sets(p, "alsa.name", pa_strip(t)); pa_xfree(t); } 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); } 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", pa_alsa_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", pa_alsa_strerror(err)); else pa_alsa_init_proplist_pcm_info(c, p, info); } void pa_alsa_init_proplist_ctl(pa_proplist *p, const char *name) { int err; snd_ctl_t *ctl; snd_ctl_card_info_t *info; const char *t; pa_assert(p); snd_ctl_card_info_alloca(&info); if ((err = snd_ctl_open(&ctl, name, 0)) < 0) { pa_log_warn("Error opening low-level control device '%s': %s", name, snd_strerror(err)); return; } if ((err = snd_ctl_card_info(ctl, info)) < 0) { pa_log_warn("Control device %s card info: %s", name, snd_strerror(err)); snd_ctl_close(ctl); return; } if ((t = snd_ctl_card_info_get_mixername(info)) && *t) pa_proplist_sets(p, "alsa.mixer_name", t); if ((t = snd_ctl_card_info_get_components(info)) && *t) pa_proplist_sets(p, "alsa.components", t); snd_ctl_close(ctl); } int pa_alsa_recover_from_poll(snd_pcm_t *pcm, int revents) { snd_pcm_state_t state; snd_pcm_hw_params_t *hwparams; 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_DISCONNECTED: /* Do not try to recover */ pa_log_info("Device disconnected."); return -1; 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", pa_alsa_strerror(err)); return -1; } break; case SND_PCM_STATE_SUSPENDED: snd_pcm_hw_params_alloca(&hwparams); if ((err = snd_pcm_hw_params_any(pcm, hwparams)) < 0) { pa_log_debug("snd_pcm_hw_params_any() failed: %s", pa_alsa_strerror(err)); return -1; } if (snd_pcm_hw_params_can_resume(hwparams)) { /* Retry resume 3 times before giving up, then fallback to restarting the stream. */ for (int i = 0; i < 3; i++) { if ((err = snd_pcm_resume(pcm)) == 0) return 0; if (err != -EAGAIN) break; pa_msleep(25); } pa_log_warn("Could not recover alsa device from SUSPENDED state, trying to restart PCM"); } /* Fall through */ default: snd_pcm_drop(pcm); return 1; } 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", pa_alsa_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", pa_alsa_strerror(err)); pa_rtpoll_item_free(item); return NULL; } return item; } snd_pcm_sframes_t pa_alsa_safe_avail(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(pcm); if (n <= 0) return n; k = (size_t) n * pa_frame_size(ss); if (PA_UNLIKELY(k >= hwbuf_size * 5 || k >= pa_bytes_per_second(ss)*10)) { PA_ONCE_BEGIN { char *dn = pa_alsa_get_driver_name_by_pcm(pcm); pa_log_debug(ngettext("snd_pcm_avail() returned a value that is exceptionally large: %lu byte (%lu ms).\n" "Most likely this is a bug in the ALSA driver '%s'. Please report this issue to the ALSA developers.", "snd_pcm_avail() returned a value that is exceptionally large: %lu bytes (%lu ms).\n" "Most likely this is a bug in the ALSA driver '%s'. Please report this issue to the ALSA developers.", (unsigned long) k), (unsigned long) k, (unsigned long) (pa_bytes_to_usec(k, ss) / PA_USEC_PER_MSEC), pa_strnull(dn)); pa_xfree(dn); pa_alsa_dump(PA_LOG_DEBUG, pcm); } PA_ONCE_END; /* Mhmm, let's try not to fail completely */ n = (snd_pcm_sframes_t) (hwbuf_size / pa_frame_size(ss)); } return n; } int pa_alsa_safe_delay(snd_pcm_t *pcm, snd_pcm_status_t *status, snd_pcm_sframes_t *delay, size_t hwbuf_size, const pa_sample_spec *ss, bool capture) { ssize_t k; size_t abs_k; int err; snd_pcm_sframes_t avail = 0; #if (SND_LIB_VERSION >= ((1<<16)|(1<<8)|0)) /* API additions in 1.1.0 */ snd_pcm_audio_tstamp_config_t tstamp_config; #endif pa_assert(pcm); pa_assert(delay); pa_assert(hwbuf_size > 0); pa_assert(ss); /* Some ALSA driver expose weird bugs, let's inform the user about * what is going on. We're going to get both the avail and delay values so * that we can compare and check them for capture. * This is done with snd_pcm_status() which provides * avail, delay and timestamp values in a single kernel call to improve * timer-based scheduling */ #if (SND_LIB_VERSION >= ((1<<16)|(1<<8)|0)) /* API additions in 1.1.0 */ /* The time stamp configuration needs to be set so that the * ALSA code will use the internal delay reported by the driver. * The time stamp configuration was introduced in alsa version 1.1.0. */ tstamp_config.type_requested = 1; /* ALSA default time stamp type */ tstamp_config.report_delay = 1; snd_pcm_status_set_audio_htstamp_config(status, &tstamp_config); #endif if ((err = snd_pcm_status(pcm, status)) < 0) return err; avail = snd_pcm_status_get_avail(status); *delay = snd_pcm_status_get_delay(status); k = (ssize_t) *delay * (ssize_t) pa_frame_size(ss); abs_k = k >= 0 ? (size_t) k : (size_t) -k; if (PA_UNLIKELY(abs_k >= hwbuf_size * 5 || abs_k >= pa_bytes_per_second(ss)*10)) { PA_ONCE_BEGIN { char *dn = pa_alsa_get_driver_name_by_pcm(pcm); pa_log_debug(ngettext("snd_pcm_delay() returned a value that is exceptionally large: %li byte (%s%lu ms).\n" "Most likely this is a bug in the ALSA driver '%s'. Please report this issue to the ALSA developers.", "snd_pcm_delay() returned a value that is exceptionally large: %li bytes (%s%lu ms).\n" "Most likely this is a bug in the ALSA driver '%s'. Please report this issue to the ALSA developers.", (signed long) k), (signed long) k, k < 0 ? "-" : "", (unsigned long) (pa_bytes_to_usec(abs_k, ss) / PA_USEC_PER_MSEC), pa_strnull(dn)); pa_xfree(dn); pa_alsa_dump(PA_LOG_DEBUG, pcm); } PA_ONCE_END; /* Mhmm, let's try not to fail completely */ if (k < 0) *delay = -(snd_pcm_sframes_t) (hwbuf_size / pa_frame_size(ss)); else *delay = (snd_pcm_sframes_t) (hwbuf_size / pa_frame_size(ss)); } if (capture) { abs_k = (size_t) avail * pa_frame_size(ss); if (PA_UNLIKELY(abs_k >= hwbuf_size * 5 || abs_k >= pa_bytes_per_second(ss)*10)) { PA_ONCE_BEGIN { char *dn = pa_alsa_get_driver_name_by_pcm(pcm); pa_log_debug(ngettext("snd_pcm_avail() returned a value that is exceptionally large: %lu byte (%lu ms).\n" "Most likely this is a bug in the ALSA driver '%s'. Please report this issue to the ALSA developers.", "snd_pcm_avail() returned a value that is exceptionally large: %lu bytes (%lu ms).\n" "Most likely this is a bug in the ALSA driver '%s'. Please report this issue to the ALSA developers.", (unsigned long) k), (unsigned long) k, (unsigned long) (pa_bytes_to_usec(k, ss) / PA_USEC_PER_MSEC), pa_strnull(dn)); pa_xfree(dn); pa_alsa_dump(PA_LOG_DEBUG, pcm); } PA_ONCE_END; /* Mhmm, let's try not to fail completely */ avail = (snd_pcm_sframes_t) (hwbuf_size / pa_frame_size(ss)); } if (PA_UNLIKELY(*delay < avail)) { PA_ONCE_BEGIN { char *dn = pa_alsa_get_driver_name_by_pcm(pcm); pa_log(_("snd_pcm_avail_delay() returned strange values: delay %lu is less than avail %lu.\n" "Most likely this is a bug in the ALSA driver '%s'. Please report this issue to the ALSA developers."), (unsigned long) *delay, (unsigned long) avail, pa_strnull(dn)); pa_xfree(dn); pa_alsa_dump(PA_LOG_ERROR, pcm); } PA_ONCE_END; /* try to fixup */ *delay = avail; } } return 0; } 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 (PA_UNLIKELY(*frames > before || k >= hwbuf_size * 3 || k >= pa_bytes_per_second(ss)*10)) PA_ONCE_BEGIN { char *dn = pa_alsa_get_driver_name_by_pcm(pcm); pa_log_debug(ngettext("snd_pcm_mmap_begin() returned a value that is exceptionally large: %lu byte (%lu ms).\n" "Most likely this is a bug in the ALSA driver '%s'. Please report this issue to the ALSA developers.", "snd_pcm_mmap_begin() returned a value that is exceptionally large: %lu bytes (%lu ms).\n" "Most likely this is a bug in the ALSA driver '%s'. Please report this issue to the ALSA developers.", (unsigned long) k), (unsigned long) k, (unsigned long) (pa_bytes_to_usec(k, ss) / PA_USEC_PER_MSEC), pa_strnull(dn)); pa_xfree(dn); pa_alsa_dump(PA_LOG_DEBUG, pcm); } PA_ONCE_END; 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; } char *pa_alsa_get_driver_name_by_pcm(snd_pcm_t *pcm) { int card; snd_pcm_info_t* info; snd_pcm_info_alloca(&info); pa_assert(pcm); if (snd_pcm_info(pcm, info) < 0) return NULL; if ((card = snd_pcm_info_get_card(info)) < 0) return NULL; return pa_alsa_get_driver_name(card); } char *pa_alsa_get_reserve_name(const char *device) { const char *t; int i; pa_assert(device); if ((t = strchr(device, ':'))) device = t+1; if ((i = snd_card_get_index(device)) < 0) { int32_t k; if (pa_atoi(device, &k) < 0) return NULL; i = (int) k; } return pa_sprintf_malloc("Audio%i", i); } unsigned int *pa_alsa_get_supported_rates(snd_pcm_t *pcm, unsigned int fallback_rate) { static unsigned int all_rates[] = { 8000, 11025, 12000, 16000, 22050, 24000, 32000, 44100, 48000, 64000, 88200, 96000, 128000, 176400, 192000, 384000 }; bool supported[PA_ELEMENTSOF(all_rates)] = { false, }; snd_pcm_hw_params_t *hwparams; unsigned int i, j, n, *rates = NULL; int ret; snd_pcm_hw_params_alloca(&hwparams); if ((ret = snd_pcm_hw_params_any(pcm, hwparams)) < 0) { pa_log_debug("snd_pcm_hw_params_any() failed: %s", pa_alsa_strerror(ret)); return NULL; } for (i = 0, n = 0; i < PA_ELEMENTSOF(all_rates); i++) { if (snd_pcm_hw_params_test_rate(pcm, hwparams, all_rates[i], 0) == 0) { supported[i] = true; n++; } } if (n > 0) { rates = pa_xnew(unsigned int, n + 1); for (i = 0, j = 0; i < PA_ELEMENTSOF(all_rates); i++) { if (supported[i]) rates[j++] = all_rates[i]; } rates[j] = 0; } else { rates = pa_xnew(unsigned int, 2); rates[0] = fallback_rate; if ((ret = snd_pcm_hw_params_set_rate_near(pcm, hwparams, &rates[0], NULL)) < 0) { pa_log_debug("snd_pcm_hw_params_set_rate_near() failed: %s", pa_alsa_strerror(ret)); pa_xfree(rates); return NULL; } rates[1] = 0; } return rates; } pa_sample_format_t *pa_alsa_get_supported_formats(snd_pcm_t *pcm, pa_sample_format_t fallback_format) { static const snd_pcm_format_t format_trans_to_pa[] = { [SND_PCM_FORMAT_U8] = PA_SAMPLE_U8, [SND_PCM_FORMAT_A_LAW] = PA_SAMPLE_ALAW, [SND_PCM_FORMAT_MU_LAW] = PA_SAMPLE_ULAW, [SND_PCM_FORMAT_S16_LE] = PA_SAMPLE_S16LE, [SND_PCM_FORMAT_S16_BE] = PA_SAMPLE_S16BE, [SND_PCM_FORMAT_FLOAT_LE] = PA_SAMPLE_FLOAT32LE, [SND_PCM_FORMAT_FLOAT_BE] = PA_SAMPLE_FLOAT32BE, [SND_PCM_FORMAT_S32_LE] = PA_SAMPLE_S32LE, [SND_PCM_FORMAT_S32_BE] = PA_SAMPLE_S32BE, [SND_PCM_FORMAT_S24_3LE] = PA_SAMPLE_S24LE, [SND_PCM_FORMAT_S24_3BE] = PA_SAMPLE_S24BE, [SND_PCM_FORMAT_S24_LE] = PA_SAMPLE_S24_32LE, [SND_PCM_FORMAT_S24_BE] = PA_SAMPLE_S24_32BE, }; static const snd_pcm_format_t all_formats[] = { SND_PCM_FORMAT_U8, SND_PCM_FORMAT_A_LAW, SND_PCM_FORMAT_MU_LAW, SND_PCM_FORMAT_S16_LE, SND_PCM_FORMAT_S16_BE, SND_PCM_FORMAT_FLOAT_LE, SND_PCM_FORMAT_FLOAT_BE, SND_PCM_FORMAT_S32_LE, SND_PCM_FORMAT_S32_BE, SND_PCM_FORMAT_S24_3LE, SND_PCM_FORMAT_S24_3BE, SND_PCM_FORMAT_S24_LE, SND_PCM_FORMAT_S24_BE, }; bool supported[PA_ELEMENTSOF(all_formats)] = { false, }; snd_pcm_hw_params_t *hwparams; unsigned int i, j, n; pa_sample_format_t *formats = NULL; int ret; snd_pcm_hw_params_alloca(&hwparams); if ((ret = snd_pcm_hw_params_any(pcm, hwparams)) < 0) { pa_log_debug("snd_pcm_hw_params_any() failed: %s", pa_alsa_strerror(ret)); return NULL; } for (i = 0, n = 0; i < PA_ELEMENTSOF(all_formats); i++) { if (snd_pcm_hw_params_test_format(pcm, hwparams, all_formats[i]) == 0) { supported[i] = true; n++; } } if (n > 0) { formats = pa_xnew(pa_sample_format_t, n + 1); for (i = 0, j = 0; i < PA_ELEMENTSOF(all_formats); i++) { if (supported[i]) formats[j++] = format_trans_to_pa[all_formats[i]]; } formats[j] = PA_SAMPLE_MAX; } else { formats = pa_xnew(pa_sample_format_t, 2); formats[0] = fallback_format; if ((ret = snd_pcm_hw_params_set_format(pcm, hwparams, format_trans_to_pa[formats[0]])) < 0) { pa_log_debug("snd_pcm_hw_params_set_format() failed: %s", pa_alsa_strerror(ret)); pa_xfree(formats); return NULL; } formats[1] = PA_SAMPLE_MAX; } return formats; } bool pa_alsa_pcm_is_hw(snd_pcm_t *pcm) { snd_pcm_info_t* info; snd_pcm_info_alloca(&info); pa_assert(pcm); if (snd_pcm_info(pcm, info) < 0) return false; return snd_pcm_info_get_card(info) >= 0; } bool pa_alsa_pcm_is_modem(snd_pcm_t *pcm) { snd_pcm_info_t* info; snd_pcm_info_alloca(&info); pa_assert(pcm); if (snd_pcm_info(pcm, info) < 0) return false; return snd_pcm_info_get_class(info) == SND_PCM_CLASS_MODEM; } PA_STATIC_TLS_DECLARE(cstrerror, pa_xfree); const char* pa_alsa_strerror(int errnum) { const char *original = NULL; char *translated, *t; char errbuf[128]; if ((t = PA_STATIC_TLS_GET(cstrerror))) pa_xfree(t); original = snd_strerror(errnum); if (!original) { pa_snprintf(errbuf, sizeof(errbuf), "Unknown error %i", errnum); original = errbuf; } if (!(translated = pa_locale_to_utf8(original))) { pa_log_warn("Unable to convert error string to locale, filtering."); translated = pa_utf8_filter(original); } PA_STATIC_TLS_SET(cstrerror, translated); return translated; } bool pa_alsa_may_tsched(bool want) { if (!want) return false; if (!pa_rtclock_hrtimer()) { /* We cannot depend on being woken up in time when the timers are inaccurate, so let's fallback to classic IO based playback then. */ pa_log_notice("Disabling timer-based scheduling because high-resolution timers are not available from the kernel."); return false; } if (pa_running_in_vm()) { /* We cannot depend on being woken up when we ask for in a VM, * so let's fallback to classic IO based playback then. */ pa_log_notice("Disabling timer-based scheduling because running inside a VM."); return false; } return true; } #define SND_MIXER_ELEM_PULSEAUDIO (SND_MIXER_ELEM_LAST + 10) static snd_mixer_elem_t *pa_alsa_mixer_find(snd_mixer_t *mixer, snd_ctl_elem_iface_t iface, const char *name, unsigned int index, unsigned int device) { snd_mixer_elem_t *elem; for (elem = snd_mixer_first_elem(mixer); elem; elem = snd_mixer_elem_next(elem)) { snd_hctl_elem_t *helem; if (snd_mixer_elem_get_type(elem) != SND_MIXER_ELEM_PULSEAUDIO) continue; helem = snd_mixer_elem_get_private(elem); if (snd_hctl_elem_get_interface(helem) != iface) continue; if (!pa_streq(snd_hctl_elem_get_name(helem), name)) continue; if (snd_hctl_elem_get_index(helem) != index) continue; if (snd_hctl_elem_get_device(helem) != device) continue; return elem; } return NULL; } snd_mixer_elem_t *pa_alsa_mixer_find_card(snd_mixer_t *mixer, const char *name, unsigned int device) { return pa_alsa_mixer_find(mixer, SND_CTL_ELEM_IFACE_CARD, name, 0, device); } snd_mixer_elem_t *pa_alsa_mixer_find_pcm(snd_mixer_t *mixer, const char *name, unsigned int device) { return pa_alsa_mixer_find(mixer, SND_CTL_ELEM_IFACE_PCM, name, 0, device); } static int mixer_class_compare(const snd_mixer_elem_t *c1, const snd_mixer_elem_t *c2) { /* Dummy compare function */ return c1 == c2 ? 0 : (c1 > c2 ? 1 : -1); } static int mixer_class_event(snd_mixer_class_t *class, unsigned int mask, snd_hctl_elem_t *helem, snd_mixer_elem_t *melem) { int err; const char *name = snd_hctl_elem_get_name(helem); if (mask & SND_CTL_EVENT_MASK_ADD) { snd_ctl_elem_iface_t iface = snd_hctl_elem_get_interface(helem); if (iface == SND_CTL_ELEM_IFACE_CARD || iface == SND_CTL_ELEM_IFACE_PCM) { snd_mixer_elem_t *new_melem; /* Put the hctl pointer as our private data - it will be useful for callbacks */ if ((err = snd_mixer_elem_new(&new_melem, SND_MIXER_ELEM_PULSEAUDIO, 0, helem, NULL)) < 0) { pa_log_warn("snd_mixer_elem_new failed: %s", pa_alsa_strerror(err)); return 0; } if ((err = snd_mixer_elem_attach(new_melem, helem)) < 0) { pa_log_warn("snd_mixer_elem_attach failed: %s", pa_alsa_strerror(err)); snd_mixer_elem_free(melem); return 0; } if ((err = snd_mixer_elem_add(new_melem, class)) < 0) { pa_log_warn("snd_mixer_elem_add failed: %s", pa_alsa_strerror(err)); return 0; } } } else if (mask & SND_CTL_EVENT_MASK_VALUE) { snd_mixer_elem_value(melem); /* Calls the element callback */ return 0; } else pa_log_info("Got an unknown mixer class event for %s: mask 0x%x", name, mask); return 0; } static int prepare_mixer(snd_mixer_t *mixer, const char *dev) { int err; snd_mixer_class_t *class; 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, pa_alsa_strerror(err)); return -1; } if (snd_mixer_class_malloc(&class)) { pa_log_info("Failed to allocate mixer class for %s", dev); return -1; } snd_mixer_class_set_event(class, mixer_class_event); snd_mixer_class_set_compare(class, mixer_class_compare); if ((err = snd_mixer_class_register(class, mixer)) < 0) { pa_log_info("Unable register mixer class for %s: %s", dev, pa_alsa_strerror(err)); snd_mixer_class_free(class); return -1; } /* From here on, the mixer class is deallocated by alsa on snd_mixer_close/free. */ if ((err = snd_mixer_selem_register(mixer, NULL, NULL)) < 0) { pa_log_warn("Unable to register mixer: %s", pa_alsa_strerror(err)); return -1; } if ((err = snd_mixer_load(mixer)) < 0) { pa_log_warn("Unable to load mixer: %s", pa_alsa_strerror(err)); return -1; } pa_log_info("Successfully attached to mixer '%s'", dev); return 0; } snd_mixer_t *pa_alsa_open_mixer(pa_hashmap *mixers, int alsa_card_index, bool probe) { char *md = pa_sprintf_malloc("hw:%i", alsa_card_index); snd_mixer_t *m = pa_alsa_open_mixer_by_name(mixers, md, probe); pa_xfree(md); return m; } snd_mixer_t *pa_alsa_open_mixer_by_name(pa_hashmap *mixers, const char *dev, bool probe) { int err; snd_mixer_t *m; pa_alsa_mixer *pm; char *dev2; void *state; pa_assert(mixers); pa_assert(dev); pm = pa_hashmap_get(mixers, dev); /* The quick card number/index lookup (hw:#) * We already know the card number/index, thus use the mixer * from the cache at first. */ if (!pm && pa_strneq(dev, "hw:", 3)) { const char *s = dev + 3; int card_index; while (*s && *s >= '0' && *s <= '9') s++; if (*s == '\0' && pa_atoi(dev + 3, &card_index) >= 0) { PA_HASHMAP_FOREACH_KV(dev2, pm, mixers, state) { if (pm->card_index == card_index) { dev = dev2; pm = pa_hashmap_get(mixers, dev); break; } } } } if (pm) { if (!probe) pm->used_for_probe_only = false; return pm->mixer_handle; } if ((err = snd_mixer_open(&m, 0)) < 0) { pa_log("Error opening mixer: %s", pa_alsa_strerror(err)); return NULL; } if (prepare_mixer(m, dev) >= 0) { pm = pa_xnew0(pa_alsa_mixer, 1); if (pm) { snd_hctl_t *hctl; pm->card_index = -1; /* determine the ALSA card number (index) and store it to card_index */ err = snd_mixer_get_hctl(m, dev, &hctl); if (err >= 0) { snd_ctl_card_info_t *info; snd_ctl_card_info_alloca(&info); err = snd_ctl_card_info(snd_hctl_ctl(hctl), info); if (err >= 0) pm->card_index = snd_ctl_card_info_get_card(info); } pm->used_for_probe_only = probe; pm->mixer_handle = m; pa_hashmap_put(mixers, pa_xstrdup(dev), pm); return m; } } snd_mixer_close(m); return NULL; } snd_mixer_t *pa_alsa_open_mixer_for_pcm(pa_hashmap *mixers, snd_pcm_t *pcm, bool probe) { snd_pcm_info_t* info; snd_pcm_info_alloca(&info); pa_assert(pcm); if (snd_pcm_info(pcm, info) >= 0) { int card_idx; if ((card_idx = snd_pcm_info_get_card(info)) >= 0) return pa_alsa_open_mixer(mixers, card_idx, probe); } return NULL; } void pa_alsa_mixer_set_fdlist(pa_hashmap *mixers, snd_mixer_t *mixer_handle, pa_mainloop_api *ml) { pa_alsa_mixer *pm; void *state; PA_HASHMAP_FOREACH(pm, mixers, state) if (pm->mixer_handle == mixer_handle) { pm->used_for_probe_only = false; if (!pm->fdl) { pm->fdl = pa_alsa_fdlist_new(); if (pm->fdl) pa_alsa_fdlist_set_handle(pm->fdl, pm->mixer_handle, NULL, ml); } } } void pa_alsa_mixer_free(pa_alsa_mixer *mixer) { if (mixer->fdl) pa_alsa_fdlist_free(mixer->fdl); if (mixer->mixer_handle) snd_mixer_close(mixer->mixer_handle); pa_xfree(mixer); } int pa_alsa_get_hdmi_eld(snd_hctl_elem_t *elem, pa_hdmi_eld *eld) { /* The ELD format is specific to HDA Intel sound cards and defined in the HDA specification: http://www.intel.com/content/www/us/en/standards/high-definition-audio-specification.html */ int err; snd_ctl_elem_info_t *info; snd_ctl_elem_value_t *value; uint8_t *elddata; unsigned int eldsize, mnl; unsigned int device; pa_assert(eld != NULL); pa_assert(elem != NULL); /* Does it have any contents? */ snd_ctl_elem_info_alloca(&info); snd_ctl_elem_value_alloca(&value); if ((err = snd_hctl_elem_info(elem, info)) < 0 || (err = snd_hctl_elem_read(elem, value)) < 0) { pa_log_warn("Accessing ELD control failed with error %s", snd_strerror(err)); return -1; } device = snd_hctl_elem_get_device(elem); eldsize = snd_ctl_elem_info_get_count(info); elddata = (unsigned char *) snd_ctl_elem_value_get_bytes(value); if (elddata == NULL || eldsize == 0) { pa_log_debug("ELD info empty (for device=%d)", device); return -1; } if (eldsize < 20 || eldsize > 256) { pa_log_debug("ELD info has wrong size (for device=%d)", device); return -1; } /* Try to fetch monitor name */ mnl = elddata[4] & 0x1f; if (mnl == 0 || mnl > 16 || 20 + mnl > eldsize) { pa_log_debug("No monitor name in ELD info (for device=%d)", device); mnl = 0; } memcpy(eld->monitor_name, &elddata[20], mnl); eld->monitor_name[mnl] = '\0'; if (mnl) pa_log_debug("Monitor name in ELD info is '%s' (for device=%d)", eld->monitor_name, device); return 0; }