Establishes pcm i/o for the snd_usb_us122l module.
Needs below section to be a part of ~/.asoundrc: # The usb_stream plugin configuration pcm.!usb_stream { @args [ CARD ] @args.CARD { type string default "0" }
type usb_stream
card $CARD }
Example loop command: $ ARGS="-MDusb_stream:2 -fS24_3LE -r44100 -c2 --period-size=640" ; arecord $ARGS | aplay $ARGS
Signed-off-by: Karsten Wiese fzu@wemgehoertderstaat.de
---
diff -NpurX /home/ka/diff_exc alsa-plugins-1.0.15/configure.in alsa-plugins-1.0.15+usb_stream/configure.in --- alsa-plugins-1.0.15/configure.in 2008-03-22 18:43:36.000000000 +0100 +++ alsa-plugins-1.0.15+usb_stream/configure.in 2008-03-16 18:07:17.000000000 +0100 @@ -111,6 +111,7 @@ AC_OUTPUT([ rate-lavc/Makefile maemo/Makefile doc/Makefile + usb_stream/Makefile ])
dnl Show the build conditions diff -NpurX /home/ka/diff_exc alsa-plugins-1.0.15/Makefile.am alsa-plugins-1.0.15+usb_stream/Makefile.am --- alsa-plugins-1.0.15/Makefile.am 2008-03-22 18:43:00.000000000 +0100 +++ alsa-plugins-1.0.15+usb_stream/Makefile.am 2008-03-12 00:55:25.000000000 +0100 @@ -18,7 +18,7 @@ if HAVE_PPH PPHDIR = pph endif
-SUBDIRS = oss mix $(PPHDIR) $(JACKDIR) $(PULSEDIR) $(SAMPLERATEDIR) $(A52DIR) $(LAVCRATEDIR) $(MAEMODIR) doc +SUBDIRS = oss mix $(PPHDIR) $(JACKDIR) $(PULSEDIR) $(SAMPLERATEDIR) $(A52DIR) $(LAVCRATEDIR) $(MAEMODIR) usb_stream doc EXTRA_DIST = hgcompile version COPYING.GPL AUTOMAKE_OPTIONS = foreign
diff -NpurX /home/ka/diff_exc alsa-plugins-1.0.15/usb_stream/Makefile.am alsa-plugins-1.0.15+usb_stream/usb_stream/Makefile.am --- alsa-plugins-1.0.15/usb_stream/Makefile.am 1970-01-01 01:00:00.000000000 +0100 +++ alsa-plugins-1.0.15+usb_stream/usb_stream/Makefile.am 2008-03-07 23:23:59.000000000 +0100 @@ -0,0 +1,9 @@ +asound_module_pcm_usb_stream_LTLIBRARIES = libasound_module_pcm_usb_stream.la + +asound_module_pcm_usb_streamdir = @ALSA_PLUGIN_DIR@ + +AM_CFLAGS = -Wall -g @ALSA_CFLAGS@ +AM_LDFLAGS = -module -avoid-version -export-dynamic + +libasound_module_pcm_usb_stream_la_SOURCES = pcm_usb_stream.c +libasound_module_pcm_usb_stream_la_LIBADD = @ALSA_LIBS@ diff -NpurX /home/ka/diff_exc alsa-plugins-1.0.15/usb_stream/pcm_usb_stream.c alsa-plugins-1.0.15+usb_stream/usb_stream/pcm_usb_stream.c --- alsa-plugins-1.0.15/usb_stream/pcm_usb_stream.c 1970-01-01 01:00:00.000000000 +0100 +++ alsa-plugins-1.0.15+usb_stream/usb_stream/pcm_usb_stream.c 2008-05-18 12:06:07.000000000 +0200 @@ -0,0 +1,485 @@ +/* + * PCM - USB_STREAM plugin + * + * Copyright (c) 2008 by Karsten Wiese fzu@wemgehoertderstaat.de + * + * This library 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. + * + * This program 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 Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <byteswap.h> +#define _GNU_SOURCE +#include <sys/mman.h> +#include <sys/shm.h> +#include <sys/ioctl.h> +#include <sys/types.h> +#include <sys/socket.h> +#include <pthread.h> + +#include <alsa/asoundlib.h> +#include <alsa/pcm_external.h> +#include <alsa/hwdep.h> + +// FIXME: better way needed to include the kernel's sound/usb/usx2y/usb_stream.h +#include "/lib/modules/2.6.25.4/source/sound/usb/usx2y/usb_stream.h" + +#define DEBUG +#ifdef DEBUG +#define DBG(f, ...) \ + fprintf(stderr, "%s:%i %i "f"\n", __FUNCTION__, __LINE__, getpid(), ## __VA_ARGS__); +#else +#define DBG(f, ...) +#endif + +#ifdef VDEBUG +#define VDBG(f, ...) \ + fprintf(stderr, "%s:%i %i "f"\n", __FUNCTION__, __LINE__, getpid(), ## __VA_ARGS__); +#else +#define VDBG(f, ...) +#endif + +#define LCARD 32 +struct user_usb_stream { + char card[LCARD]; + unsigned use; + struct usb_stream *s; + void *write_area; + struct user_usb_stream *next; +}; + +typedef struct { + snd_pcm_ioplug_t io; + + snd_hwdep_t *hwdep; + struct user_usb_stream *uus; + + struct pollfd pfd; + + unsigned int num_ports; + unsigned periods_start; + unsigned periods_done; + + unsigned channels; +} snd_pcm_us_t; + +static struct user_usb_stream *uus; +static pthread_mutex_t uus_mutex = PTHREAD_MUTEX_INITIALIZER; + +struct user_usb_stream *get_uus(const char *card) +{ + pthread_mutex_lock(&uus_mutex); + + struct user_usb_stream **l_uus = &uus, + *r_uus = NULL; + while (*l_uus) { + if (strcmp((*l_uus)->card, card) == 0) { + r_uus = *l_uus; + r_uus->use++; + goto unlock; + } + l_uus = &(*l_uus)->next; + } + r_uus = calloc(1, sizeof(*r_uus)); + if (r_uus) { + r_uus->use = 1; + strcpy(r_uus->card, card); + *l_uus = r_uus; + } + +unlock: + pthread_mutex_unlock(&uus_mutex); + return r_uus; +} + +static void uus_free(snd_pcm_us_t *us) +{ + if (!us->uus) + return; + + pthread_mutex_lock(&uus_mutex); + us->uus->use--; + if (!us->uus->use) { + struct user_usb_stream **n_uus = &uus, + *p_uus; + while (us->uus != *n_uus) { + p_uus = *n_uus; + n_uus = &p_uus->next; + } + *n_uus = us->uus->next; + if (us->uus->s) { + munmap(us->uus->write_area, us->uus->s->write_size); + munmap(us->uus->s, us->uus->s->read_size); + } + free(us->uus); + } + pthread_mutex_unlock(&uus_mutex); +} + +static void us_free(snd_pcm_us_t *us) +{ + uus_free(us); + free(us); +} + +static int snd_pcm_us_close(snd_pcm_ioplug_t *io) +{ + snd_pcm_us_t *us = io->private_data; + snd_hwdep_close(us->hwdep); + us_free(us); + return 0; +} + +static snd_pcm_sframes_t snd_pcm_us_pointer(snd_pcm_ioplug_t *io) +{ + snd_pcm_us_t *us = io->private_data; + struct usb_stream *s = us->uus->s; + snd_pcm_sframes_t hw_pointer; + + switch (io->state) { + case SND_PCM_STATE_RUNNING: + VDBG("%u %u", s->periods_done, us->periods_done); + if (s->periods_done - us->periods_done <= 1) + hw_pointer = + (s->periods_done - us->periods_start) & 1 ? + io->period_size : 0; + else + hw_pointer = -EPIPE; + + break; + case SND_PCM_STATE_XRUN: + hw_pointer = -EPIPE; + break; + default: + hw_pointer = 0; + break; + } + VDBG("%li", hw_pointer); + return hw_pointer; +} + +static int snd_pcm_us_prepare(snd_pcm_ioplug_t *io) +{ + struct usb_stream_config us_cfg; + snd_pcm_us_t *us = io->private_data; + struct user_usb_stream *uus = us->uus; + int ioctl_result, err; + + VDBG(""); + + us_cfg.version = USB_STREAM_INTERFACE_VERSION; + us_cfg.frame_size = 6; + us_cfg.sample_rate = io->rate; + us_cfg.period_frames = io->period_size; + + ioctl_result = snd_hwdep_ioctl(us->hwdep, SNDRV_USB_STREAM_IOCTL_SET_PARAMS, &us_cfg); + if (ioctl_result < 0) { + perror("Couldn't configure usb_stream\n"); + return ioctl_result; + } + + if (ioctl_result && uus && uus->s) { + err = munmap(uus->write_area, uus->s->write_size); + if (err < 0) + return -errno; + err = munmap(uus->s, uus->s->read_size); + if (err < 0) + return -errno; + uus->s = NULL; + } + + if (!uus->s) { + uus->s = mmap(NULL, sizeof(struct usb_stream), + PROT_READ, + MAP_SHARED, us->pfd.fd, + 0); + if (MAP_FAILED == uus->s) { + perror("ALSA/USX2Y: mmap"); + return -errno; + } + + VDBG("%p %lx %i", uus->s, uus->s, uus->s->read_size); + + if (memcmp(&uus->s->cfg, &us_cfg, sizeof(us_cfg))) { + perror("usb_stream Configuration error usb_stream\n"); + return -EIO; + } + + + uus->s = mremap(uus->s, sizeof(struct usb_stream), uus->s->read_size, MREMAP_MAYMOVE); + if (MAP_FAILED == uus->s) { + perror("ALSA/USX2Y: mmap"); + return -EPERM; + } + + VDBG("%p %lx %i", uus->s, uus->s, uus->s->read_size); + + uus->write_area = mmap(NULL, uus->s->write_size, + PROT_READ|PROT_WRITE, + MAP_SHARED, us->pfd.fd, + (uus->s->read_size + 4095) & ~4095); + if (MAP_FAILED == uus->write_area) { + perror("ALSA/USX2Y: mmap"); + return -1; + } + VDBG("%p %i", uus->write_area, uus->s->write_size); + } + + if (uus->s->state != usb_stream_ready) + return -EIO; + + if (poll(&us->pfd, 1, 500000) < 0) + return -errno; + + return 0; +} + +static int snd_pcm_us_start(snd_pcm_ioplug_t *io) +{ + snd_pcm_us_t *us = io->private_data; + VDBG("%u", us->uus->s->periods_done); + + us->periods_start = us->periods_done = us->uus->s->periods_done; + + return 0; +} + +static int snd_pcm_us_stop(snd_pcm_ioplug_t *io) +{ + snd_pcm_us_t *us = io->private_data; + VDBG("%u", us->uus->s->periods_done); + + if (io->stream == SND_PCM_STREAM_PLAYBACK) + memset(us->uus->write_area, 0, us->uus->s->write_size); + + return 0; +} + +static snd_pcm_sframes_t snd_pcm_us_write(snd_pcm_ioplug_t *io, + const snd_pcm_channel_area_t *areas, + snd_pcm_uframes_t offset, + snd_pcm_uframes_t size) +{ + void *playback_addr; + snd_pcm_us_t *us = io->private_data; + struct user_usb_stream *uus = us->uus; + struct usb_stream *s = uus->s; + unsigned bytes; + void *src = areas->addr + offset * s->cfg.frame_size; + + VDBG("%li %li %i %i", offset, size, areas->first, areas->step); + + playback_addr = uus->write_area + s->outpacket[0].offset; + memcpy(playback_addr, src, s->outpacket[0].length); + bytes = size * s->cfg.frame_size; + if (bytes > s->outpacket[0].length) { + playback_addr = uus->write_area + s->outpacket[1].offset; + memcpy(playback_addr, src + s->outpacket[0].length, + bytes - s->outpacket[0].length); + } + us->periods_done++; + return size; +} + +static int usb_stream_read(struct user_usb_stream *uus, void *to, unsigned bytes) +{ + struct usb_stream *s = uus->s; + int p = s->inpacket_split, l = 0; + void *i = (void *)s + s->inpacket[p].offset + s->inpacket_split_at; + int il = s->inpacket[p].length - s->inpacket_split_at; + + do { + if (l + il > s->period_size) + il = s->period_size - l; + memcpy(to + l, i, il); + l += il; + if (l >= s->period_size) + break; + + p = (p + 1) % s->inpackets; + i = (void *)s + s->inpacket[p].offset; + il = s->inpacket[p].length; + } while (p != s->inpacket_split); + + return l; +} + +static snd_pcm_sframes_t snd_pcm_us_read(snd_pcm_ioplug_t *io, + const snd_pcm_channel_area_t *areas, + snd_pcm_uframes_t offset, + snd_pcm_uframes_t size) +{ + snd_pcm_us_t *us = io->private_data; + unsigned frame_size = us->uus->s->cfg.frame_size; + void *to = areas->addr + offset * frame_size; + snd_pcm_uframes_t red; + + if (size) { + if (size != us->uus->s->cfg.period_frames) { + SNDERR("usb_stream plugin only supports period_size" + " long reads, sorry"); + return -EINVAL; + } + if (us->uus->s->periods_done - us->periods_done == 1) { + red = usb_stream_read(us->uus, to, size * frame_size) / + frame_size; + us->periods_done++; + return red; + } + } else + if (io->state == SND_PCM_STATE_XRUN) + return -EPIPE; + return 0; +} + +static snd_pcm_ioplug_callback_t us_playback_callback = { + .close = snd_pcm_us_close, + .start = snd_pcm_us_start, + .stop = snd_pcm_us_stop, + .transfer = snd_pcm_us_write, + .pointer = snd_pcm_us_pointer, + .prepare = snd_pcm_us_prepare, +}; +static snd_pcm_ioplug_callback_t us_capture_callback = { + .close = snd_pcm_us_close, + .start = snd_pcm_us_start, + .stop = snd_pcm_us_stop, + .transfer = snd_pcm_us_read, + .pointer = snd_pcm_us_pointer, + .prepare = snd_pcm_us_prepare, +}; + +#define ARRAY_SIZE(ary) (sizeof(ary)/sizeof(ary[0])) + +static int us_set_hw_constraint(snd_pcm_us_t *us) +{ + unsigned access_list[] = { + SND_PCM_ACCESS_MMAP_INTERLEAVED, + }; + unsigned format_list[] = { + SND_PCM_FORMAT_S24_3LE, + }; + + int err; + + if ((err = snd_pcm_ioplug_set_param_list(&us->io, SND_PCM_IOPLUG_HW_ACCESS, + ARRAY_SIZE(access_list), access_list)) < 0 || + (err = snd_pcm_ioplug_set_param_list(&us->io, SND_PCM_IOPLUG_HW_FORMAT, + ARRAY_SIZE(format_list), format_list)) < 0 || + (err = snd_pcm_ioplug_set_param_minmax(&us->io, SND_PCM_IOPLUG_HW_CHANNELS, + us->channels, us->channels)) < 0 || + (err = snd_pcm_ioplug_set_param_minmax(&us->io, SND_PCM_IOPLUG_HW_RATE, + 44100, 96000)) < 0 || + (err = snd_pcm_ioplug_set_param_minmax(&us->io, SND_PCM_IOPLUG_HW_PERIOD_BYTES, + 128, 64*4096)) < 0 || + (err = snd_pcm_ioplug_set_param_minmax(&us->io, SND_PCM_IOPLUG_HW_PERIODS, + 2, 2)) < 0) + return err; + + return 0; +} + +static int snd_pcm_us_open(snd_pcm_t **pcmp, const char *name, + const char *card, + snd_pcm_stream_t stream, int mode) +{ + snd_pcm_us_t *us; + int err; + char us_name[32]; + + if (strlen(card) >= LCARD) + return -EINVAL; + + assert(pcmp); + us = calloc(1, sizeof(*us)); + if (!us) + return -ENOMEM; + + if (snprintf(us_name, sizeof(us_name), "hw:%s", card) + >= (int)sizeof(us_name)) { + fprintf(stderr, "%s: WARNING: USB_STREAM client name '%s' truncated to %d characters, might not be unique\n", + __func__, us_name, (int)strlen(us_name)); + } + VDBG("%i %s", stream, us_name); + us->uus = get_uus(card); + if (!us->uus) + return -ENOMEM; + err = snd_hwdep_open(&us->hwdep, us_name, O_RDWR); + if (err < 0) { + us_free(us); + return err; + } + snd_hwdep_poll_descriptors(us->hwdep, &us->pfd, 1); + + us->channels = 2; + + us->io.version = SND_PCM_IOPLUG_VERSION; + us->io.name = "ALSA <-> USB_STREAM PCM I/O Plugin"; + us->io.callback = stream == SND_PCM_STREAM_PLAYBACK ? + &us_playback_callback : &us_capture_callback; + us->io.private_data = us; + us->io.mmap_rw = 0; + us->io.poll_fd = us->pfd.fd; + us->io.poll_events = stream == SND_PCM_STREAM_PLAYBACK ? POLLOUT : POLLIN; + + err = snd_pcm_ioplug_create(&us->io, name, stream, mode); + if (err < 0) { + us_free(us); + return err; + } + + err = us_set_hw_constraint(us); + if (err < 0) { + snd_pcm_ioplug_delete(&us->io); + return err; + } + + VDBG(""); + *pcmp = us->io.pcm; + + return 0; +} + + +SND_PCM_PLUGIN_DEFINE_FUNC(usb_stream) +{ + snd_config_iterator_t i, next; + const char *card; + int err; + + snd_config_for_each(i, next, conf) { + snd_config_t *n = snd_config_iterator_entry(i); + const char *id; + if (snd_config_get_id(n, &id) < 0) + continue; + + if (strcmp(id, "comment") == 0 || strcmp(id, "type") == 0) + continue; + if (strcmp(id, "card") == 0) { + if (snd_config_get_type(n) != SND_CONFIG_TYPE_STRING) { + SNDERR("Invalid type for %s", id); + return -EINVAL; + } + snd_config_get_string(n, &card); + continue; + } + SNDERR("Unknown field %s", id); + return -EINVAL; + } + + err = snd_pcm_us_open(pcmp, name, card, stream, mode); + + return err; +} + +SND_PCM_PLUGIN_SYMBOL(usb_stream);