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authorfulup <fulup.arfoll@iot.bzh>2017-07-05 22:31:54 +0200
committerfulup <fulup.arfoll@iot.bzh>2017-07-05 22:31:54 +0200
commit3d5816a07c22dd6c655a60000fb0f175d613e484 (patch)
treee96ebc4d7fc38c79d2aae61fde0f5789f4219c9c /HAL-afb/HAL-plugin/HalPlugPcm.c
parent85a4c0a1e0f666505cf2a2922c12e78b3c83c062 (diff)
Added a POC for ALSA/HAL plugin
Diffstat (limited to 'HAL-afb/HAL-plugin/HalPlugPcm.c')
-rw-r--r--HAL-afb/HAL-plugin/HalPlugPcm.c430
1 files changed, 0 insertions, 430 deletions
diff --git a/HAL-afb/HAL-plugin/HalPlugPcm.c b/HAL-afb/HAL-plugin/HalPlugPcm.c
deleted file mode 100644
index d43b44c..0000000
--- a/HAL-afb/HAL-plugin/HalPlugPcm.c
+++ /dev/null
@@ -1,430 +0,0 @@
-/*
- * 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);