Added a POC for ALSA/HAL plugin

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);