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-rw-r--r--HAL-afb/HAL-plugin/HalPlugPcm.c430
1 files changed, 430 insertions, 0 deletions
diff --git a/HAL-afb/HAL-plugin/HalPlugPcm.c b/HAL-afb/HAL-plugin/HalPlugPcm.c
new file mode 100644
index 0000000..d43b44c
--- /dev/null
+++ b/HAL-afb/HAL-plugin/HalPlugPcm.c
@@ -0,0 +1,430 @@
+/*
+ * ALSA <-> OSS PCM I/O plugin
+ *
+ * Copyright (c) 2005 by Takashi Iwai <tiwai@suse.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 <stdio.h>
+#include <sys/ioctl.h>
+#include <alsa/asoundlib.h>
+#include <alsa/pcm_external.h>
+#include <linux/soundcard.h>
+
+typedef struct snd_pcm_oss {
+ snd_pcm_ioplug_t io;
+ char *device;
+ int fd;
+ int fragment_set;
+ int caps;
+ int format;
+ unsigned int period_shift;
+ unsigned int periods;
+ unsigned int frame_bytes;
+} snd_pcm_oss_t;
+
+static snd_pcm_sframes_t oss_write(snd_pcm_ioplug_t *io,
+ const snd_pcm_channel_area_t *areas,
+ snd_pcm_uframes_t offset,
+ snd_pcm_uframes_t size)
+{
+ snd_pcm_oss_t *oss = io->private_data;
+ const char *buf;
+ ssize_t result;
+
+ /* we handle only an interleaved buffer */
+ buf = (char *)areas->addr + (areas->first + areas->step * offset) / 8;
+ size *= oss->frame_bytes;
+ result = write(oss->fd, buf, size);
+ if (result <= 0)
+ return result;
+ return result / oss->frame_bytes;
+}
+
+static snd_pcm_sframes_t oss_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_oss_t *oss = io->private_data;
+ char *buf;
+ ssize_t result;
+
+ /* we handle only an interleaved buffer */
+ buf = (char *)areas->addr + (areas->first + areas->step * offset) / 8;
+ size *= oss->frame_bytes;
+ result = read(oss->fd, buf, size);
+ if (result <= 0)
+ return result;
+ return result / oss->frame_bytes;
+}
+
+static snd_pcm_sframes_t oss_pointer(snd_pcm_ioplug_t *io)
+{
+ snd_pcm_oss_t *oss = io->private_data;
+ struct count_info info;
+ int ptr;
+
+ if (ioctl(oss->fd, io->stream == SND_PCM_STREAM_PLAYBACK ?
+ SNDCTL_DSP_GETOPTR : SNDCTL_DSP_GETIPTR, &info) < 0) {
+ fprintf(stderr, "*** OSS: oss_pointer error\n");
+ return 0;
+ }
+ ptr = snd_pcm_bytes_to_frames(io->pcm, info.ptr);
+ return ptr;
+}
+
+static int oss_start(snd_pcm_ioplug_t *io)
+{
+ snd_pcm_oss_t *oss = io->private_data;
+ int tmp = io->stream == SND_PCM_STREAM_PLAYBACK ?
+ PCM_ENABLE_OUTPUT : PCM_ENABLE_INPUT;
+
+ if (ioctl(oss->fd, SNDCTL_DSP_SETTRIGGER, &tmp) < 0) {
+ fprintf(stderr, "*** OSS: trigger failed\n");
+ if (io->stream == SND_PCM_STREAM_CAPTURE)
+ /* fake read to trigger */
+ read(oss->fd, &tmp, 0);
+ }
+ return 0;
+}
+
+static int oss_stop(snd_pcm_ioplug_t *io)
+{
+ snd_pcm_oss_t *oss = io->private_data;
+ int tmp = 0;
+
+ ioctl(oss->fd, SNDCTL_DSP_SETTRIGGER, &tmp);
+ return 0;
+}
+
+static int oss_drain(snd_pcm_ioplug_t *io)
+{
+ snd_pcm_oss_t *oss = io->private_data;
+
+ if (io->stream == SND_PCM_STREAM_PLAYBACK)
+ ioctl(oss->fd, SNDCTL_DSP_SYNC);
+ return 0;
+}
+
+static int oss_prepare(snd_pcm_ioplug_t *io)
+{
+ snd_pcm_oss_t *oss = io->private_data;
+ int tmp;
+
+ ioctl(oss->fd, SNDCTL_DSP_RESET);
+
+ tmp = io->channels;
+ if (ioctl(oss->fd, SNDCTL_DSP_CHANNELS, &tmp) < 0) {
+ perror("SNDCTL_DSP_CHANNELS");
+ return -EINVAL;
+ }
+ tmp = oss->format;
+ if (ioctl(oss->fd, SNDCTL_DSP_SETFMT, &tmp) < 0) {
+ perror("SNDCTL_DSP_SETFMT");
+ return -EINVAL;
+ }
+ tmp = io->rate;
+ if (ioctl(oss->fd, SNDCTL_DSP_SPEED, &tmp) < 0 ||
+ tmp > io->rate * 1.01 || tmp < io->rate * 0.99) {
+ perror("SNDCTL_DSP_SPEED");
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static int oss_hw_params(snd_pcm_ioplug_t *io,
+ snd_pcm_hw_params_t *params ATTRIBUTE_UNUSED)
+{
+ snd_pcm_oss_t *oss = io->private_data;
+ int i, tmp, err;
+ unsigned int period_bytes;
+ long oflags, flags;
+
+ oss->frame_bytes = (snd_pcm_format_physical_width(io->format) * io->channels) / 8;
+ switch (io->format) {
+ case SND_PCM_FORMAT_U8:
+ oss->format = AFMT_U8;
+ break;
+ case SND_PCM_FORMAT_S16_LE:
+ oss->format = AFMT_S16_LE;
+ break;
+ case SND_PCM_FORMAT_S16_BE:
+ oss->format = AFMT_S16_BE;
+ break;
+ default:
+ fprintf(stderr, "*** OSS: unsupported format %s\n", snd_pcm_format_name(io->format));
+ return -EINVAL;
+ }
+ period_bytes = io->period_size * oss->frame_bytes;
+ oss->period_shift = 0;
+ for (i = 31; i >= 4; i--) {
+ if (period_bytes & (1U << i)) {
+ oss->period_shift = i;
+ break;
+ }
+ }
+ if (! oss->period_shift) {
+ fprintf(stderr, "*** OSS: invalid period size %d\n", (int)io->period_size);
+ return -EINVAL;
+ }
+ oss->periods = io->buffer_size / io->period_size;
+
+ _retry:
+ tmp = oss->period_shift | (oss->periods << 16);
+ if (ioctl(oss->fd, SNDCTL_DSP_SETFRAGMENT, &tmp) < 0) {
+ if (! oss->fragment_set) {
+ perror("SNDCTL_DSP_SETFRAGMENT");
+ fprintf(stderr, "*** period shift = %d, periods = %d\n", oss->period_shift, oss->periods);
+ return -EINVAL;
+ }
+ /* OSS has no proper way to reinitialize the fragments */
+ /* try to reopen the device */
+ close(oss->fd);
+ oss->fd = open(oss->device, io->stream == SND_PCM_STREAM_PLAYBACK ?
+ O_WRONLY : O_RDONLY);
+ if (oss->fd < 0) {
+ err = -errno;
+ SNDERR("Cannot reopen the device %s", oss->device);
+ return err;
+ }
+ io->poll_fd = oss->fd;
+ io->poll_events = io->stream == SND_PCM_STREAM_PLAYBACK ?
+ POLLOUT : POLLIN;
+ snd_pcm_ioplug_reinit_status(io);
+ oss->fragment_set = 0;
+ goto _retry;
+ }
+ oss->fragment_set = 1;
+
+ if ((flags = fcntl(oss->fd, F_GETFL)) < 0) {
+ err = -errno;
+ perror("F_GETFL");
+ } else {
+ oflags = flags;
+ if (io->nonblock)
+ flags |= O_NONBLOCK;
+ else
+ flags &= ~O_NONBLOCK;
+ if (flags != oflags &&
+ fcntl(oss->fd, F_SETFL, flags) < 0) {
+ err = -errno;
+ perror("F_SETFL");
+ }
+ }
+
+ return 0;
+}
+
+#define ARRAY_SIZE(ary) (sizeof(ary)/sizeof(ary[0]))
+
+static int oss_hw_constraint(snd_pcm_oss_t *oss)
+{
+ snd_pcm_ioplug_t *io = &oss->io;
+ static const snd_pcm_access_t access_list[] = {
+ SND_PCM_ACCESS_RW_INTERLEAVED,
+ SND_PCM_ACCESS_MMAP_INTERLEAVED
+ };
+ unsigned int nformats;
+ unsigned int format[5];
+ unsigned int nchannels;
+ unsigned int channel[6];
+ /* period and buffer bytes must be power of two */
+ static const unsigned int bytes_list[] = {
+ 1U<<8, 1U<<9, 1U<<10, 1U<<11, 1U<<12, 1U<<13, 1U<<14, 1U<<15,
+ 1U<<16, 1U<<17, 1U<<18, 1U<<19, 1U<<20, 1U<<21, 1U<<22, 1U<<23
+ };
+ int i, err, tmp;
+
+ /* check trigger */
+ oss->caps = 0;
+ if (ioctl(oss->fd, SNDCTL_DSP_GETCAPS, &oss->caps) >= 0) {
+ if (! (oss->caps & DSP_CAP_TRIGGER))
+ fprintf(stderr, "*** OSS: trigger is not supported!\n");
+ }
+
+ /* access type - interleaved only */
+ if ((err = snd_pcm_ioplug_set_param_list(io, SND_PCM_IOPLUG_HW_ACCESS,
+ ARRAY_SIZE(access_list), access_list)) < 0)
+ return err;
+
+ /* supported formats */
+ tmp = 0;
+ ioctl(oss->fd, SNDCTL_DSP_GETFMTS, &tmp);
+ nformats = 0;
+ if (tmp & AFMT_U8)
+ format[nformats++] = SND_PCM_FORMAT_U8;
+ if (tmp & AFMT_S16_LE)
+ format[nformats++] = SND_PCM_FORMAT_S16_LE;
+ if (tmp & AFMT_S16_BE)
+ format[nformats++] = SND_PCM_FORMAT_S16_BE;
+ if (tmp & AFMT_MU_LAW)
+ format[nformats++] = SND_PCM_FORMAT_MU_LAW;
+ if (! nformats)
+ format[nformats++] = SND_PCM_FORMAT_S16;
+ if ((err = snd_pcm_ioplug_set_param_list(io, SND_PCM_IOPLUG_HW_FORMAT,
+ nformats, format)) < 0)
+ return err;
+
+ /* supported channels */
+ nchannels = 0;
+ for (i = 0; i < 6; i++) {
+ tmp = i + 1;
+ if (ioctl(oss->fd, SNDCTL_DSP_CHANNELS, &tmp) >= 0)
+ channel[nchannels++] = tmp;
+ }
+ if (! nchannels) /* assume 2ch stereo */
+ err = snd_pcm_ioplug_set_param_minmax(io, SND_PCM_IOPLUG_HW_CHANNELS,
+ 2, 2);
+ else
+ err = snd_pcm_ioplug_set_param_list(io, SND_PCM_IOPLUG_HW_CHANNELS,
+ nchannels, channel);
+ if (err < 0)
+ return err;
+
+ /* supported rates */
+ /* FIXME: should query? */
+ err = snd_pcm_ioplug_set_param_minmax(io, SND_PCM_IOPLUG_HW_RATE, 8000, 480000);
+ if (err < 0)
+ return err;
+
+ /* period size (in power of two) */
+ err = snd_pcm_ioplug_set_param_list(io, SND_PCM_IOPLUG_HW_PERIOD_BYTES,
+ ARRAY_SIZE(bytes_list), bytes_list);
+ if (err < 0)
+ return err;
+ /* periods */
+ err = snd_pcm_ioplug_set_param_minmax(io, SND_PCM_IOPLUG_HW_PERIODS, 2, 1024);
+ if (err < 0)
+ return err;
+ /* buffer size (in power of two) */
+ err = snd_pcm_ioplug_set_param_list(io, SND_PCM_IOPLUG_HW_BUFFER_BYTES,
+ ARRAY_SIZE(bytes_list), bytes_list);
+ if (err < 0)
+ return err;
+
+ return 0;
+}
+
+
+static int oss_close(snd_pcm_ioplug_t *io)
+{
+ snd_pcm_oss_t *oss = io->private_data;
+
+ close(oss->fd);
+ free(oss->device);
+ free(oss);
+ return 0;
+}
+
+static const snd_pcm_ioplug_callback_t oss_playback_callback = {
+ .start = oss_start,
+ .stop = oss_stop,
+ .transfer = oss_write,
+ .pointer = oss_pointer,
+ .close = oss_close,
+ .hw_params = oss_hw_params,
+ .prepare = oss_prepare,
+ .drain = oss_drain,
+};
+
+static const snd_pcm_ioplug_callback_t oss_capture_callback = {
+ .start = oss_start,
+ .stop = oss_stop,
+ .transfer = oss_read,
+ .pointer = oss_pointer,
+ .close = oss_close,
+ .hw_params = oss_hw_params,
+ .prepare = oss_prepare,
+ .drain = oss_drain,
+};
+
+
+SND_PCM_PLUGIN_DEFINE_FUNC(oss)
+{
+ snd_config_iterator_t i, next;
+ const char *device = "/dev/dsp";
+ int err;
+ snd_pcm_oss_t *oss;
+
+ 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 || strcmp(id, "hint") == 0)
+ continue;
+ if (strcmp(id, "device") == 0) {
+ if (snd_config_get_string(n, &device) < 0) {
+ SNDERR("Invalid type for %s", id);
+ return -EINVAL;
+ }
+ continue;
+ }
+ SNDERR("Unknown field %s", id);
+ return -EINVAL;
+ }
+
+ oss = calloc(1, sizeof(*oss));
+ if (! oss) {
+ SNDERR("cannot allocate");
+ return -ENOMEM;
+ }
+
+ oss->device = strdup(device);
+ if (oss->device == NULL) {
+ SNDERR("cannot allocate");
+ free(oss);
+ return -ENOMEM;
+ }
+ oss->fd = open(device, stream == SND_PCM_STREAM_PLAYBACK ?
+ O_WRONLY : O_RDONLY);
+ if (oss->fd < 0) {
+ err = -errno;
+ SNDERR("Cannot open device %s", device);
+ goto error;
+ }
+
+ oss->io.version = SND_PCM_IOPLUG_VERSION;
+ oss->io.name = "ALSA <-> OSS PCM I/O Plugin";
+ oss->io.poll_fd = oss->fd;
+ oss->io.poll_events = stream == SND_PCM_STREAM_PLAYBACK ? POLLOUT : POLLIN;
+ oss->io.mmap_rw = 0;
+ oss->io.callback = stream == SND_PCM_STREAM_PLAYBACK ?
+ &oss_playback_callback : &oss_capture_callback;
+ oss->io.private_data = oss;
+
+ err = snd_pcm_ioplug_create(&oss->io, name, stream, mode);
+ if (err < 0)
+ goto error;
+
+ if ((err = oss_hw_constraint(oss)) < 0) {
+ snd_pcm_ioplug_delete(&oss->io);
+ return err;
+ }
+
+ *pcmp = oss->io.pcm;
+ return 0;
+
+ error:
+ if (oss->fd >= 0)
+ close(oss->fd);
+ free(oss->device);
+ free(oss);
+ return err;
+}
+
+SND_PCM_PLUGIN_SYMBOL(oss);