--- /dev/null
+/*
+ * PCM - Null plugin
+ * Copyright (c) 2000 by Abramo Bagnara <abramo@alsa-project.org>
+ *
+ *
+ * This library is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Library General Public License as
+ * published by the Free Software Foundation; either version 2 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 Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#include <byteswap.h>
+#include <limits.h>
+#include "pcm_local.h"
+#include "pcm_plugin.h"
+
+typedef struct {
+ snd_pcm_setup_t setup;
+ snd_timestamp_t trigger_time;
+ int state;
+ size_t appl_ptr;
+ size_t hw_ptr;
+ int poll_fd;
+} snd_pcm_null_t;
+
+static int snd_pcm_null_close(snd_pcm_t *pcm)
+{
+ snd_pcm_null_t *null = pcm->private;
+ close(null->poll_fd);
+ free(null);
+ return 0;
+}
+
+static int snd_pcm_null_nonblock(snd_pcm_t *pcm ATTRIBUTE_UNUSED, int nonblock ATTRIBUTE_UNUSED)
+{
+ return 0;
+}
+
+static int snd_pcm_null_async(snd_pcm_t *pcm ATTRIBUTE_UNUSED, int sig ATTRIBUTE_UNUSED, pid_t pid ATTRIBUTE_UNUSED)
+{
+ return -ENOSYS;
+}
+
+static int snd_pcm_null_info(snd_pcm_t *pcm ATTRIBUTE_UNUSED, snd_pcm_info_t * info)
+{
+ memset(info, 0, sizeof(*info));
+ /* FIXME */
+ return 0;
+}
+
+static int snd_pcm_null_channel_info(snd_pcm_t *pcm ATTRIBUTE_UNUSED, snd_pcm_channel_info_t * info)
+{
+ int channel = info->channel;
+ memset(info, 0, sizeof(*info));
+ info->channel = channel;
+ return 0;
+}
+
+static int snd_pcm_null_channel_params(snd_pcm_t *pcm ATTRIBUTE_UNUSED, snd_pcm_channel_params_t * params ATTRIBUTE_UNUSED)
+{
+ return 0;
+}
+
+static int snd_pcm_null_channel_setup(snd_pcm_t *pcm ATTRIBUTE_UNUSED, snd_pcm_channel_setup_t * setup)
+{
+ int channel = setup->channel;
+ memset(setup, 0, sizeof(*setup));
+ setup->channel = channel;
+ return 0;
+}
+
+static int snd_pcm_null_status(snd_pcm_t *pcm, snd_pcm_status_t * status)
+{
+ snd_pcm_null_t *null = pcm->private;
+ memset(status, 0, sizeof(*status));
+ status->state = null->state;
+ status->trigger_time = null->trigger_time;
+ gettimeofday(&status->tstamp, 0);
+ status->avail = pcm->setup.buffer_size;
+ status->avail_max = status->avail;
+ return 0;
+}
+
+static int snd_pcm_null_state(snd_pcm_t *pcm)
+{
+ snd_pcm_null_t *null = pcm->private;
+ return null->state;
+}
+
+static int snd_pcm_null_delay(snd_pcm_t *pcm ATTRIBUTE_UNUSED, ssize_t *delayp)
+{
+ *delayp = 0;
+ return 0;
+}
+
+static int snd_pcm_null_prepare(snd_pcm_t *pcm)
+{
+ snd_pcm_null_t *null = pcm->private;
+ null->state = SND_PCM_STATE_PREPARED;
+ null->appl_ptr = 0;
+ null->hw_ptr = 0;
+ return 0;
+}
+
+static int snd_pcm_null_start(snd_pcm_t *pcm)
+{
+ snd_pcm_null_t *null = pcm->private;
+ assert(null->state == SND_PCM_STATE_PREPARED);
+ null->state = SND_PCM_STATE_RUNNING;
+ if (pcm->stream == SND_PCM_STREAM_CAPTURE)
+ snd_pcm_mmap_appl_forward(pcm, pcm->setup.buffer_size);
+ return 0;
+}
+
+static int snd_pcm_null_drop(snd_pcm_t *pcm)
+{
+ snd_pcm_null_t *null = pcm->private;
+ assert(null->state != SND_PCM_STATE_OPEN);
+ null->state = SND_PCM_STATE_SETUP;
+ return 0;
+}
+
+static int snd_pcm_null_drain(snd_pcm_t *pcm)
+{
+ snd_pcm_null_t *null = pcm->private;
+ assert(null->state != SND_PCM_STATE_OPEN);
+ null->state = SND_PCM_STATE_SETUP;
+ return 0;
+}
+
+static int snd_pcm_null_pause(snd_pcm_t *pcm, int enable)
+{
+ snd_pcm_null_t *null = pcm->private;
+ if (enable) {
+ if (null->state != SND_PCM_STATE_RUNNING)
+ return -EBADFD;
+ } else if (null->state != SND_PCM_STATE_PAUSED)
+ return -EBADFD;
+ null->state = SND_PCM_STATE_PAUSED;
+ return 0;
+}
+
+static ssize_t snd_pcm_null_rewind(snd_pcm_t *pcm, size_t frames)
+{
+ snd_pcm_null_t *null = pcm->private;
+ switch (null->state) {
+ case SND_PCM_STATE_PREPARED:
+ case SND_PCM_STATE_RUNNING:
+ snd_pcm_mmap_appl_backward(pcm, frames);
+ snd_pcm_mmap_hw_backward(pcm, frames);
+ return frames;
+ default:
+ return -EBADFD;
+ }
+}
+
+static ssize_t snd_pcm_null_fwd(snd_pcm_t *pcm, size_t size)
+{
+ snd_pcm_null_t *null = pcm->private;
+ switch (null->state) {
+ case SND_PCM_STATE_PREPARED:
+ case SND_PCM_STATE_RUNNING:
+ snd_pcm_mmap_appl_forward(pcm, size);
+ snd_pcm_mmap_hw_forward(pcm, size);
+ return size;
+ default:
+ return -EBADFD;
+ }
+}
+
+static ssize_t snd_pcm_null_writei(snd_pcm_t *pcm, const void *buffer ATTRIBUTE_UNUSED, size_t size)
+{
+ snd_pcm_null_t *null = pcm->private;
+ if (null->state == SND_PCM_STATE_PREPARED &&
+ pcm->setup.start_mode != SND_PCM_START_EXPLICIT) {
+ null->state = SND_PCM_STATE_RUNNING;
+ }
+ return snd_pcm_null_fwd(pcm, size);
+}
+
+static ssize_t snd_pcm_null_writen(snd_pcm_t *pcm, void **bufs ATTRIBUTE_UNUSED, size_t size)
+{
+ snd_pcm_null_t *null = pcm->private;
+ if (null->state == SND_PCM_STATE_PREPARED &&
+ pcm->setup.start_mode != SND_PCM_START_EXPLICIT) {
+ null->state = SND_PCM_STATE_RUNNING;
+ }
+ return snd_pcm_null_fwd(pcm, size);
+}
+
+static ssize_t snd_pcm_null_readi(snd_pcm_t *pcm, void *buffer ATTRIBUTE_UNUSED, size_t size)
+{
+ snd_pcm_null_t *null = pcm->private;
+ if (null->state == SND_PCM_STATE_PREPARED &&
+ pcm->setup.start_mode != SND_PCM_START_EXPLICIT) {
+ null->state = SND_PCM_STATE_RUNNING;
+ snd_pcm_mmap_hw_forward(pcm, pcm->setup.buffer_size);
+ }
+ return snd_pcm_null_fwd(pcm, size);
+}
+
+static ssize_t snd_pcm_null_readn(snd_pcm_t *pcm, void **bufs ATTRIBUTE_UNUSED, size_t size)
+{
+ snd_pcm_null_t *null = pcm->private;
+ if (null->state == SND_PCM_STATE_PREPARED &&
+ pcm->setup.start_mode != SND_PCM_START_EXPLICIT) {
+ null->state = SND_PCM_STATE_RUNNING;
+ snd_pcm_mmap_hw_forward(pcm, pcm->setup.buffer_size);
+ }
+ return snd_pcm_null_fwd(pcm, size);
+}
+
+static ssize_t snd_pcm_null_mmap_forward(snd_pcm_t *pcm, size_t size)
+{
+ return snd_pcm_null_fwd(pcm, size);
+}
+
+static ssize_t snd_pcm_null_avail_update(snd_pcm_t *pcm)
+{
+ return pcm->setup.buffer_size;
+}
+
+static int snd_pcm_null_set_avail_min(snd_pcm_t *pcm, size_t frames)
+{
+ pcm->setup.buffer_size = frames;
+ return 0;
+}
+
+static int snd_pcm_null_mmap(snd_pcm_t *pcm)
+{
+ snd_pcm_mmap_info_t *i;
+ int err;
+ i = calloc(1, sizeof(*i));
+ if (!i)
+ return -ENOMEM;
+ err = snd_pcm_alloc_user_mmap(pcm, i);
+ if (err < 0) {
+ free(i);
+ return err;
+ }
+ pcm->mmap_info = i;
+ pcm->mmap_info_count = 1;
+ return 0;
+}
+
+static int snd_pcm_null_munmap(snd_pcm_t *pcm)
+{
+ int err = snd_pcm_free_mmap(pcm, pcm->mmap_info);
+ if (err < 0)
+ return err;
+ free(pcm->mmap_info);
+ pcm->mmap_info_count = 0;
+ pcm->mmap_info = 0;
+ return 0;
+}
+
+static int snd_pcm_null_params_info(snd_pcm_t *pcm ATTRIBUTE_UNUSED, snd_pcm_params_info_t * info)
+{
+ int sizes = ((info->req_mask & SND_PCM_PARAMS_SFMT) &&
+ (info->req_mask & SND_PCM_PARAMS_CHANNELS));
+ info->flags = SND_PCM_INFO_MMAP | SND_PCM_INFO_MMAP_VALID |
+ SND_PCM_INFO_INTERLEAVED | SND_PCM_INFO_NONINTERLEAVED |
+ SND_PCM_INFO_PAUSE;
+ info->formats = ~0;
+ info->rates = SND_PCM_RATE_CONTINUOUS | SND_PCM_RATE_8000_192000;
+ info->min_rate = 4000;
+ info->max_rate = 192000;
+ info->min_channels = 1;
+ info->max_channels = 32;
+ info->min_fragments = 1;
+ info->max_fragments = 1024 * 1024;
+ if (sizes) {
+ info->buffer_size = 1024 * 1024;
+ info->min_fragment_size = 1;
+ info->max_fragment_size = 1024 * 1024;
+ info->fragment_align = 1;
+ }
+ return 0;
+}
+
+static int snd_pcm_null_params(snd_pcm_t *pcm, snd_pcm_params_t * params)
+{
+ snd_pcm_null_t *null = pcm->private;
+ snd_pcm_setup_t *s = &null->setup;
+ int w = snd_pcm_format_width(s->format.sfmt);
+ if (w < 0) {
+ params->fail_mask = SND_PCM_PARAMS_SFMT;
+ return -EINVAL;
+ }
+ s->msbits = w;
+ s->format = params->format;
+ s->start_mode = params->start_mode;
+ s->ready_mode = params->ready_mode;
+ s->avail_min = params->avail_min;
+ s->xfer_mode = params->xfer_mode;
+ s->xfer_min = params->xfer_min;
+ s->xfer_align = params->xfer_align;
+ s->xrun_mode = params->xrun_mode;
+ s->mmap_shape = params->mmap_shape;
+ s->frag_size = params->frag_size;
+ s->frags = s->buffer_size / s->frag_size;
+ if (s->frags < 1)
+ s->frags = 1;
+ s->buffer_size = s->frag_size * s->frags;
+ s->boundary = LONG_MAX - LONG_MAX % s->buffer_size;
+ s->time = params->time;
+ s->rate_master = s->format.rate;
+ s->rate_divisor = 1;
+ s->mmap_bytes = 0;
+ s->fifo_size = 1;
+ return 0;
+}
+
+static int snd_pcm_null_setup(snd_pcm_t *pcm, snd_pcm_setup_t * setup)
+{
+ snd_pcm_null_t *null = pcm->private;
+ *setup = null->setup;
+ return 0;
+}
+
+static void snd_pcm_null_dump(snd_pcm_t *pcm, FILE *fp)
+{
+ fprintf(fp, "Null PCM\n");
+ if (pcm->valid_setup) {
+ fprintf(fp, "Its setup is:\n");
+ snd_pcm_dump_setup(pcm, fp);
+ }
+}
+
+snd_pcm_ops_t snd_pcm_null_ops = {
+ close: snd_pcm_null_close,
+ info: snd_pcm_null_info,
+ params_info: snd_pcm_null_params_info,
+ params: snd_pcm_null_params,
+ setup: snd_pcm_null_setup,
+ channel_info: snd_pcm_null_channel_info,
+ channel_params: snd_pcm_null_channel_params,
+ channel_setup: snd_pcm_null_channel_setup,
+ dump: snd_pcm_null_dump,
+ nonblock: snd_pcm_null_nonblock,
+ async: snd_pcm_null_async,
+ mmap: snd_pcm_null_mmap,
+ munmap: snd_pcm_null_munmap,
+};
+
+snd_pcm_fast_ops_t snd_pcm_null_fast_ops = {
+ status: snd_pcm_null_status,
+ state: snd_pcm_null_state,
+ delay: snd_pcm_null_delay,
+ prepare: snd_pcm_null_prepare,
+ start: snd_pcm_null_start,
+ drop: snd_pcm_null_drop,
+ drain: snd_pcm_null_drain,
+ pause: snd_pcm_null_pause,
+ rewind: snd_pcm_null_rewind,
+ writei: snd_pcm_null_writei,
+ writen: snd_pcm_null_writen,
+ readi: snd_pcm_null_readi,
+ readn: snd_pcm_null_readn,
+ avail_update: snd_pcm_null_avail_update,
+ mmap_forward: snd_pcm_null_mmap_forward,
+ set_avail_min: snd_pcm_null_set_avail_min,
+};
+
+int snd_pcm_null_open(snd_pcm_t **pcmp, char *name, int stream, int mode)
+{
+ snd_pcm_t *pcm;
+ snd_pcm_null_t *null;
+ int fd;
+ assert(pcmp);
+ if (stream == SND_PCM_STREAM_PLAYBACK) {
+ fd = open("/dev/null", O_WRONLY);
+ if (fd < 0) {
+ SYSERR("Cannot open /dev/null");
+ return -errno;
+ }
+ } else {
+ fd = open("/dev/full", O_RDONLY);
+ if (fd < 0) {
+ SYSERR("Cannot open /dev/full");
+ return -errno;
+ }
+ }
+ null = calloc(1, sizeof(snd_pcm_null_t));
+ if (!null) {
+ close(fd);
+ return -ENOMEM;
+ }
+ null->poll_fd = fd;
+ null->state = SND_PCM_STATE_OPEN;
+
+ pcm = calloc(1, sizeof(snd_pcm_t));
+ if (!pcm) {
+ close(fd);
+ free(null);
+ return -ENOMEM;
+ }
+ if (name)
+ pcm->name = strdup(name);
+ pcm->type = SND_PCM_TYPE_NULL;
+ pcm->stream = stream;
+ pcm->mode = mode;
+ pcm->ops = &snd_pcm_null_ops;
+ pcm->op_arg = pcm;
+ pcm->fast_ops = &snd_pcm_null_fast_ops;
+ pcm->fast_op_arg = pcm;
+ pcm->private = null;
+ pcm->poll_fd = fd;
+ pcm->hw_ptr = &null->hw_ptr;
+ pcm->appl_ptr = &null->appl_ptr;
+ *pcmp = pcm;
+
+ return 0;
+}
+
+int _snd_pcm_null_open(snd_pcm_t **pcmp, char *name,
+ snd_config_t *conf,
+ int stream, int mode)
+{
+ snd_config_iterator_t i;
+ snd_config_foreach(i, conf) {
+ snd_config_t *n = snd_config_entry(i);
+ if (strcmp(n->id, "comment") == 0)
+ continue;
+ if (strcmp(n->id, "type") == 0)
+ continue;
+ if (strcmp(n->id, "stream") == 0)
+ continue;
+ return -EINVAL;
+ }
+ return snd_pcm_null_open(pcmp, name, stream, mode);
+}
git://git.alsa-project.org / alsa-lib.git / commitdiff