From e205b25d65ccb380fa158711e24d55b6de5d9bc1 Mon Sep 17 00:00:00 2001 From: Pierre Ossman Date: Thu, 16 Feb 2006 19:19:58 +0000 Subject: Reorganised the source tree. We now have src/ with a couple of subdirs: * daemon/ - Contains the files specific to the polypaudio daemon. * modules/ - All loadable modules. * polyp/ - Files that are part of the public, application interface or are only used in libpolyp. * polypcore/ - All other shared files. * tests/ - Test programs. * utils/ - Utility programs. git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@487 fefdeb5f-60dc-0310-8127-8f9354f1896f --- src/modules/module-alsa-source.c | 278 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 278 insertions(+) create mode 100644 src/modules/module-alsa-source.c (limited to 'src/modules/module-alsa-source.c') diff --git a/src/modules/module-alsa-source.c b/src/modules/module-alsa-source.c new file mode 100644 index 00000000..f03e51ad --- /dev/null +++ b/src/modules/module-alsa-source.c @@ -0,0 +1,278 @@ +/* $Id$ */ + +/*** + This file is part of polypaudio. + + polypaudio 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. + + polypaudio 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 polypaudio; 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 + +#ifdef HAVE_SYS_POLL_H +#include +#else +#include "poll.h" +#endif + +#include + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "module-alsa-source-symdef.h" + +PA_MODULE_AUTHOR("Lennart Poettering") +PA_MODULE_DESCRIPTION("ALSA Source") +PA_MODULE_VERSION(PACKAGE_VERSION) +PA_MODULE_USAGE("source_name= device= format= channels= rate= fragments= fragment_size=") + +struct userdata { + snd_pcm_t *pcm_handle; + pa_source *source; + pa_io_event **io_events; + unsigned n_io_events; + + size_t frame_size, fragment_size; + pa_memchunk memchunk; + pa_module *module; +}; + +static const char* const valid_modargs[] = { + "device", + "source_name", + "channels", + "rate", + "format", + "fragments", + "fragment_size", + NULL +}; + +#define DEFAULT_SOURCE_NAME "alsa_input" +#define DEFAULT_DEVICE "hw:0,0" + +static void update_usage(struct userdata *u) { + pa_module_set_used(u->module, + (u->source ? pa_idxset_size(u->source->outputs) : 0)); +} + +static void xrun_recovery(struct userdata *u) { + assert(u); + + pa_log(__FILE__": *** ALSA-XRUN (capture) ***\n"); + + if (snd_pcm_prepare(u->pcm_handle) < 0) + pa_log(__FILE__": snd_pcm_prepare() failed\n"); +} + +static void do_read(struct userdata *u) { + assert(u); + + update_usage(u); + + for (;;) { + pa_memchunk post_memchunk; + snd_pcm_sframes_t frames; + size_t l; + + if (!u->memchunk.memblock) { + u->memchunk.memblock = pa_memblock_new(u->memchunk.length = u->fragment_size, u->source->core->memblock_stat); + u->memchunk.index = 0; + } + + assert(u->memchunk.memblock && u->memchunk.memblock->data && u->memchunk.length && u->memchunk.memblock->length && (u->memchunk.length % u->frame_size) == 0); + + if ((frames = snd_pcm_readi(u->pcm_handle, (uint8_t*) u->memchunk.memblock->data + u->memchunk.index, u->memchunk.length / u->frame_size)) < 0) { + if (frames == -EAGAIN) + return; + + if (frames == -EPIPE) { + xrun_recovery(u); + continue; + } + + pa_log(__FILE__": snd_pcm_readi() failed: %s\n", strerror(-frames)); + return; + } + + l = frames * u->frame_size; + + post_memchunk = u->memchunk; + post_memchunk.length = l; + + pa_source_post(u->source, &post_memchunk); + + u->memchunk.index += l; + u->memchunk.length -= l; + + if (u->memchunk.length == 0) { + pa_memblock_unref(u->memchunk.memblock); + u->memchunk.memblock = NULL; + u->memchunk.index = u->memchunk.length = 0; + } + + break; + } +} + +static void io_callback(pa_mainloop_api*a, pa_io_event *e, PA_GCC_UNUSED int fd, PA_GCC_UNUSED pa_io_event_flags_t f, void *userdata) { + struct userdata *u = userdata; + assert(u && a && e); + + if (snd_pcm_state(u->pcm_handle) == SND_PCM_STATE_XRUN) + xrun_recovery(u); + + do_read(u); +} + +static pa_usec_t source_get_latency_cb(pa_source *s) { + struct userdata *u = s->userdata; + snd_pcm_sframes_t frames; + assert(s && u && u->source); + + if (snd_pcm_delay(u->pcm_handle, &frames) < 0) { + pa_log(__FILE__": failed to get delay\n"); + s->get_latency = NULL; + return 0; + } + + return pa_bytes_to_usec(frames * u->frame_size, &s->sample_spec); +} + +int pa__init(pa_core *c, pa_module*m) { + pa_modargs *ma = NULL; + int ret = -1; + struct userdata *u = NULL; + const char *dev; + pa_sample_spec ss; + unsigned periods, fragsize; + snd_pcm_uframes_t period_size; + size_t frame_size; + int err; + + if (!(ma = pa_modargs_new(m->argument, valid_modargs))) { + pa_log(__FILE__": failed to parse module arguments\n"); + goto fail; + } + + ss = c->default_sample_spec; + if (pa_modargs_get_sample_spec(ma, &ss) < 0) { + pa_log(__FILE__": failed to parse sample specification\n"); + goto fail; + } + frame_size = pa_frame_size(&ss); + + periods = 12; + fragsize = 1024; + if (pa_modargs_get_value_u32(ma, "fragments", &periods) < 0 || pa_modargs_get_value_u32(ma, "fragment_size", &fragsize) < 0) { + pa_log(__FILE__": failed to parse buffer metrics\n"); + goto fail; + } + period_size = fragsize; + + u = pa_xmalloc0(sizeof(struct userdata)); + m->userdata = u; + u->module = m; + + snd_config_update_free_global(); + if ((err = snd_pcm_open(&u->pcm_handle, dev = pa_modargs_get_value(ma, "device", DEFAULT_DEVICE), SND_PCM_STREAM_CAPTURE, SND_PCM_NONBLOCK)) < 0) { + pa_log(__FILE__": Error opening PCM device %s: %s\n", dev, snd_strerror(err)); + goto fail; + } + + if ((err = pa_alsa_set_hw_params(u->pcm_handle, &ss, &periods, &period_size)) < 0) { + pa_log(__FILE__": Failed to set hardware parameters: %s\n", snd_strerror(err)); + goto fail; + } + + u->source = pa_source_new(c, __FILE__, pa_modargs_get_value(ma, "source_name", DEFAULT_SOURCE_NAME), 0, &ss, NULL); + assert(u->source); + + u->source->userdata = u; + u->source->get_latency = source_get_latency_cb; + pa_source_set_owner(u->source, m); + u->source->description = pa_sprintf_malloc("Advanced Linux Sound Architecture PCM on '%s'", dev); + + if (pa_create_io_events(u->pcm_handle, c->mainloop, &u->io_events, &u->n_io_events, io_callback, u) < 0) { + pa_log(__FILE__": failed to obtain file descriptors\n"); + goto fail; + } + + u->frame_size = frame_size; + u->fragment_size = period_size; + + pa_log(__FILE__": using %u fragments of size %u bytes.\n", periods, u->fragment_size); + + u->memchunk.memblock = NULL; + u->memchunk.index = u->memchunk.length = 0; + + snd_pcm_start(u->pcm_handle); + + ret = 0; + +finish: + if (ma) + pa_modargs_free(ma); + + return ret; + +fail: + + if (u) + pa__done(c, m); + + goto finish; +} + +void pa__done(pa_core *c, pa_module*m) { + struct userdata *u; + assert(c && m); + + if (!(u = m->userdata)) + return; + + if (u->source) { + pa_source_disconnect(u->source); + pa_source_unref(u->source); + } + + if (u->io_events) + pa_free_io_events(c->mainloop, u->io_events, u->n_io_events); + + if (u->pcm_handle) { + snd_pcm_drop(u->pcm_handle); + snd_pcm_close(u->pcm_handle); + } + + if (u->memchunk.memblock) + pa_memblock_unref(u->memchunk.memblock); + + pa_xfree(u); +} + -- cgit