Merged pcmplug branch.

src/pcm/pcm_file.c

@@ -0,0 +1,447 @@
+/*
+ *  PCM - File 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 "pcm_local.h"
+#include "pcm_plugin.h"
+
+typedef struct {
+	snd_pcm_t *slave;
+	int close_slave;
+	char *fname;
+	int fd;
+} snd_pcm_file_t;
+
+static int snd_pcm_file_close(snd_pcm_t *pcm)
+{
+	snd_pcm_file_t *file = pcm->private;
+	int err = 0;
+	if (file->close_slave)
+		err = snd_pcm_close(file->slave);
+	if (file->fname) {
+		free(file->fname);
+		close(file->fd);
+	}
+	free(file);
+	return 0;
+}
+
+static int snd_pcm_file_nonblock(snd_pcm_t *pcm, int nonblock)
+{
+	snd_pcm_file_t *file = pcm->private;
+	return snd_pcm_nonblock(file->slave, nonblock);
+}
+
+static int snd_pcm_file_info(snd_pcm_t *pcm, snd_pcm_info_t * info)
+{
+	snd_pcm_file_t *file = pcm->private;
+	return snd_pcm_info(file->slave, info);
+}
+
+static int snd_pcm_file_channel_info(snd_pcm_t *pcm, snd_pcm_channel_info_t * info)
+{
+	snd_pcm_file_t *file = pcm->private;
+	return snd_pcm_channel_info(file->slave, info);
+}
+
+static int snd_pcm_file_channel_params(snd_pcm_t *pcm, snd_pcm_channel_params_t * params)
+{
+	snd_pcm_file_t *file = pcm->private;
+	return snd_pcm_channel_params(file->slave, params);
+}
+
+static int snd_pcm_file_channel_setup(snd_pcm_t *pcm, snd_pcm_channel_setup_t * setup)
+{
+	snd_pcm_file_t *file = pcm->private;
+	return snd_pcm_channel_setup(file->slave, setup);
+}
+
+static int snd_pcm_file_status(snd_pcm_t *pcm, snd_pcm_status_t * status)
+{
+	snd_pcm_file_t *file = pcm->private;
+	return snd_pcm_status(file->slave, status);
+}
+
+static int snd_pcm_file_state(snd_pcm_t *pcm)
+{
+	snd_pcm_file_t *file = pcm->private;
+	return snd_pcm_state(file->slave);
+}
+
+static int snd_pcm_file_delay(snd_pcm_t *pcm, ssize_t *delayp)
+{
+	snd_pcm_file_t *file = pcm->private;
+	return snd_pcm_delay(file->slave, delayp);
+}
+
+static int snd_pcm_file_prepare(snd_pcm_t *pcm)
+{
+	snd_pcm_file_t *file = pcm->private;
+	return snd_pcm_prepare(file->slave);
+}
+
+static int snd_pcm_file_start(snd_pcm_t *pcm)
+{
+	snd_pcm_file_t *file = pcm->private;
+	return snd_pcm_start(file->slave);
+}
+
+static int snd_pcm_file_stop(snd_pcm_t *pcm)
+{
+	snd_pcm_file_t *file = pcm->private;
+	return snd_pcm_stop(file->slave);
+}
+
+static int snd_pcm_file_flush(snd_pcm_t *pcm)
+{
+	snd_pcm_file_t *file = pcm->private;
+	return snd_pcm_flush(file->slave);
+}
+
+static int snd_pcm_file_pause(snd_pcm_t *pcm, int enable)
+{
+	snd_pcm_file_t *file = pcm->private;
+	return snd_pcm_pause(file->slave, enable);
+}
+
+static ssize_t snd_pcm_file_appl_ptr(snd_pcm_t *pcm, off_t offset)
+{
+	snd_pcm_file_t *file = pcm->private;
+	return snd_pcm_appl_ptr(file->slave, offset);
+}
+
+static void snd_pcm_file_write_areas(snd_pcm_t *pcm, 
+				     snd_pcm_channel_area_t *areas,
+				     size_t offset, size_t frames)
+{
+	snd_pcm_file_t *file = pcm->private;
+	size_t bytes = snd_pcm_frames_to_bytes(pcm, frames);
+	char buf[bytes];
+	size_t channels = pcm->setup.format.channels;
+	snd_pcm_channel_area_t buf_areas[channels];
+	size_t channel;
+	ssize_t r;
+	for (channel = 0; channel < channels; ++channel) {
+		snd_pcm_channel_area_t *a = &buf_areas[channel];
+		a->addr = buf;
+		a->first = pcm->bits_per_sample * channel;
+		a->step = pcm->bits_per_frame;
+	}
+	snd_pcm_areas_copy(areas, offset, buf_areas, 0, 
+			   channels, frames, pcm->setup.format.sfmt);
+	r = write(file->fd, buf, bytes);
+	assert(r == (ssize_t)bytes);
+}
+
+static ssize_t snd_pcm_file_writei(snd_pcm_t *pcm, const void *buffer, size_t size)
+{
+	snd_pcm_file_t *file = pcm->private;
+	ssize_t n = snd_pcm_writei(file->slave, buffer, size);
+	if (n > 0) {
+		size_t bytes = snd_pcm_frames_to_bytes(pcm, n);
+		ssize_t r = write(file->fd, buffer, bytes);
+		assert(r == (ssize_t)bytes);
+	}
+	return n;
+}
+
+static ssize_t snd_pcm_file_writen(snd_pcm_t *pcm, void **bufs, size_t size)
+{
+	snd_pcm_file_t *file = pcm->private;
+	snd_pcm_channel_area_t areas[pcm->setup.format.channels];
+	ssize_t n = snd_pcm_writen(file->slave, bufs, size);
+	if (n > 0) {
+		snd_pcm_areas_from_bufs(pcm, areas, bufs);
+		snd_pcm_file_write_areas(pcm, areas, 0, n);
+	}
+	return n;
+}
+
+static ssize_t snd_pcm_file_readi(snd_pcm_t *pcm, void *buffer, size_t size)
+{
+	snd_pcm_file_t *file = pcm->private;
+	ssize_t n = snd_pcm_readi(file->slave, buffer, size);
+	if (n > 0) {
+		size_t bytes = snd_pcm_frames_to_bytes(pcm, n);
+		ssize_t r = write(file->fd, buffer, bytes);
+		assert(r == (ssize_t)bytes);
+	}
+	return n;
+}
+
+static ssize_t snd_pcm_file_readn(snd_pcm_t *pcm, void **bufs, size_t size)
+{
+	snd_pcm_file_t *file = pcm->private;
+	snd_pcm_channel_area_t areas[pcm->setup.format.channels];
+	ssize_t n = snd_pcm_writen(file->slave, bufs, size);
+	if (n > 0) {
+		snd_pcm_areas_from_bufs(pcm, areas, bufs);
+		snd_pcm_file_write_areas(pcm, areas, 0, n);
+	}
+	return n;
+}
+
+static ssize_t snd_pcm_file_mmap_forward(snd_pcm_t *pcm, size_t size)
+{
+	snd_pcm_file_t *file = pcm->private;
+	size_t ofs = pcm->mmap_control->appl_ptr % pcm->setup.buffer_size;
+	ssize_t n = snd_pcm_mmap_forward(file->slave, size);
+	size_t xfer = 0;
+	if (n <= 0)
+		return n;
+	while (xfer < (size_t)n) {
+		size_t frames = size - xfer;
+		size_t cont = pcm->setup.buffer_size - ofs;
+		if (cont < frames)
+			frames = cont;
+		snd_pcm_file_write_areas(pcm, pcm->mmap_areas, ofs, frames);
+		ofs += frames;
+		if (ofs == pcm->setup.buffer_size)
+			ofs = 0;
+		xfer += frames;
+	}
+	return n;
+}
+
+static ssize_t snd_pcm_file_avail_update(snd_pcm_t *pcm)
+{
+	snd_pcm_file_t *file = pcm->private;
+	return snd_pcm_avail_update(file->slave);
+}
+
+static int snd_pcm_file_mmap_status(snd_pcm_t *pcm)
+{
+	snd_pcm_file_t *file = pcm->private;
+	return snd_pcm_mmap_status(file->slave, &pcm->mmap_status);
+}
+
+static int snd_pcm_file_mmap_control(snd_pcm_t *pcm)
+{
+	snd_pcm_file_t *file = pcm->private;
+	return snd_pcm_mmap_control(file->slave, &pcm->mmap_control);
+}
+
+static int snd_pcm_file_mmap_data(snd_pcm_t *pcm)
+{
+	snd_pcm_file_t *file = pcm->private;
+	return snd_pcm_mmap_data(file->slave, &pcm->mmap_data);
+}
+
+static int snd_pcm_file_munmap_status(snd_pcm_t *pcm)
+{
+	snd_pcm_file_t *file = pcm->private;
+	return snd_pcm_munmap_status(file->slave);
+}
+
+static int snd_pcm_file_munmap_control(snd_pcm_t *pcm)
+{
+	snd_pcm_file_t *file = pcm->private;
+	return snd_pcm_munmap_control(file->slave);
+}
+
+static int snd_pcm_file_munmap_data(snd_pcm_t *pcm)
+{
+	snd_pcm_file_t *file = pcm->private;
+	return snd_pcm_munmap_data(file->slave);
+}
+
+static int snd_pcm_file_poll_descriptor(snd_pcm_t *pcm)
+{
+	snd_pcm_file_t *file = pcm->private;
+	return snd_pcm_poll_descriptor(file->slave);
+}
+
+static int snd_pcm_file_channels_mask(snd_pcm_t *pcm, bitset_t *cmask)
+{
+	snd_pcm_file_t *file = pcm->private;
+	return snd_pcm_channels_mask(file->slave, cmask);
+}
+
+static int snd_pcm_file_params_info(snd_pcm_t *pcm, snd_pcm_params_info_t * info)
+{
+	snd_pcm_file_t *file = pcm->private;
+	return snd_pcm_params_info(file->slave, info);
+}
+
+static int snd_pcm_file_params(snd_pcm_t *pcm, snd_pcm_params_t * params)
+{
+	snd_pcm_file_t *file = pcm->private;
+	return snd_pcm_params(file->slave, params);
+}
+
+static int snd_pcm_file_setup(snd_pcm_t *pcm, snd_pcm_setup_t * setup)
+{
+	snd_pcm_file_t *file = pcm->private;
+	return snd_pcm_setup(file->slave, setup);
+}
+
+static void snd_pcm_file_dump(snd_pcm_t *pcm, FILE *fp)
+{
+	snd_pcm_file_t *file = pcm->private;
+	if (file->fname)
+		fprintf(fp, "File PCM (file=%s)\n", file->fname);
+	else
+		fprintf(fp, "File PCM (fd=%d)\n", file->fd);
+	if (pcm->valid_setup) {
+		fprintf(fp, "Its setup is:\n");
+		snd_pcm_dump_setup(pcm, fp);
+	}
+	fprintf(fp, "Slave: ");
+	snd_pcm_dump(file->slave, fp);
+}
+
+struct snd_pcm_ops snd_pcm_file_ops = {
+	close: snd_pcm_file_close,
+	info: snd_pcm_file_info,
+	params_info: snd_pcm_file_params_info,
+	params: snd_pcm_file_params,
+	setup: snd_pcm_file_setup,
+	channel_info: snd_pcm_file_channel_info,
+	channel_params: snd_pcm_file_channel_params,
+	channel_setup: snd_pcm_file_channel_setup,
+	dump: snd_pcm_file_dump,
+	nonblock: snd_pcm_file_nonblock,
+	mmap_status: snd_pcm_file_mmap_status,
+	mmap_control: snd_pcm_file_mmap_control,
+	mmap_data: snd_pcm_file_mmap_data,
+	munmap_status: snd_pcm_file_munmap_status,
+	munmap_control: snd_pcm_file_munmap_control,
+	munmap_data: snd_pcm_file_munmap_data,
+};
+
+struct snd_pcm_fast_ops snd_pcm_file_fast_ops = {
+	status: snd_pcm_file_status,
+	state: snd_pcm_file_state,
+	delay: snd_pcm_file_delay,
+	prepare: snd_pcm_file_prepare,
+	start: snd_pcm_file_start,
+	stop: snd_pcm_file_stop,
+	flush: snd_pcm_file_flush,
+	pause: snd_pcm_file_pause,
+	appl_ptr: snd_pcm_file_appl_ptr,
+	writei: snd_pcm_file_writei,
+	writen: snd_pcm_file_writen,
+	readi: snd_pcm_file_readi,
+	readn: snd_pcm_file_readn,
+	poll_descriptor: snd_pcm_file_poll_descriptor,
+	channels_mask: snd_pcm_file_channels_mask,
+	avail_update: snd_pcm_file_avail_update,
+	mmap_forward: snd_pcm_file_mmap_forward,
+};
+
+int snd_pcm_file_open(snd_pcm_t **handlep, char *fname, int fd, snd_pcm_t *slave, int close_slave)
+{
+	snd_pcm_t *handle;
+	snd_pcm_file_t *file;
+	int err;
+	assert(handlep && slave);
+	if (fname) {
+		fd = open(fname, O_WRONLY|O_CREAT, 0666);
+		if (fd < 0)
+			return -errno;
+	}
+	file = calloc(1, sizeof(snd_pcm_file_t));
+	if (!file) {
+		return -ENOMEM;
+	}
+	file->fname = fname;
+	file->fd = fd;
+	file->slave = slave;
+	file->close_slave = close_slave;
+
+	handle = calloc(1, sizeof(snd_pcm_t));
+	if (!handle) {
+		free(file);
+		return -ENOMEM;
+	}
+	handle->type = SND_PCM_TYPE_FILE;
+	handle->stream = slave->stream;
+	handle->ops = &snd_pcm_file_ops;
+	handle->op_arg = handle;
+	handle->fast_ops = &snd_pcm_file_fast_ops;
+	handle->fast_op_arg = handle;
+	handle->mode = slave->mode;
+	handle->private = file;
+	err = snd_pcm_init(handle);
+	if (err < 0) {
+		snd_pcm_close(handle);
+		return err;
+	}
+	*handlep = handle;
+
+	return 0;
+}
+
+int _snd_pcm_file_open(snd_pcm_t **pcmp, char *name,
+		       snd_config_t *conf, 
+		       int stream, int mode)
+{
+	snd_config_iterator_t i;
+	char *sname = NULL;
+	int err;
+	snd_pcm_t *spcm;
+	char *fname = NULL;
+	long fd = -1;
+	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;
+		if (strcmp(n->id, "sname") == 0) {
+			err = snd_config_string_get(n, &sname);
+			if (err < 0)
+				return -EINVAL;
+			continue;
+		}
+		if (strcmp(n->id, "file") == 0) {
+			err = snd_config_string_get(n, &fname);
+			if (err < 0) {
+				err = snd_config_integer_get(n, &fd);
+				if (err < 0)
+					return -EINVAL;
+			}
+			continue;
+		}
+		return -EINVAL;
+	}
+	if (!sname || (!fname && fd < 0))
+		return -EINVAL;
+	if (fname) {
+		fname = strdup(fname);
+		if (!fname)
+			return -ENOMEM;
+	}
+	/* This is needed cause snd_config_update may destroy config */
+	sname = strdup(sname);
+	if (!sname)
+		return  -ENOMEM;
+	err = snd_pcm_open(&spcm, sname, stream, mode);
+	free(sname);
+	if (err < 0)
+		return err;
+	err = snd_pcm_file_open(pcmp, fname, fd, spcm, 1);
+	if (err < 0)
+		snd_pcm_close(spcm);
+	return err;
+}