From 3d5816a07c22dd6c655a60000fb0f175d613e484 Mon Sep 17 00:00:00 2001 From: fulup Date: Wed, 5 Jul 2017 22:31:54 +0200 Subject: Added a POC for ALSA/HAL plugin --- HAL-afb/HAL-plugin/HalPlugPcm.c | 430 ---------------------------------------- 1 file changed, 430 deletions(-) delete mode 100644 HAL-afb/HAL-plugin/HalPlugPcm.c (limited to 'HAL-afb/HAL-plugin/HalPlugPcm.c') 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 - * - * 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 -#include -#include -#include -#include - -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); -- cgit 1.2.3-korg