+/**
+ * \file pcm/pcm_alaw.c
+ * \ingroup PCM_Plugins
+ * \brief PCM A-Law Conversion Plugin Interface
+ * \author Abramo Bagnara <abramo@alsa-project.org>
+ * \date 2000-2001
+ */
/*
* PCM - A-Law conversion
* 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
+ * 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 Library General Public License for more details.
+ * GNU Lesser General Public License for more details.
*
- * You should have received a copy of the GNU Library General Public
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
-#include <byteswap.h>
+#include "bswap.h"
#include "pcm_local.h"
#include "pcm_plugin.h"
-typedef void (*alaw_f)(snd_pcm_channel_area_t *src_areas,
- size_t src_offset,
- snd_pcm_channel_area_t *dst_areas,
- size_t dst_offset,
- size_t frames, size_t channels, int getputidx);
+#include "plugin_ops.h"
+
+#ifndef PIC
+/* entry for static linking */
+const char *_snd_module_pcm_alaw = "";
+#endif
+
+#ifndef DOC_HIDDEN
+
+typedef void (*alaw_f)(const snd_pcm_channel_area_t *dst_areas,
+ snd_pcm_uframes_t dst_offset,
+ const snd_pcm_channel_area_t *src_areas,
+ snd_pcm_uframes_t src_offset,
+ unsigned int channels, snd_pcm_uframes_t frames,
+ unsigned int getputidx);
typedef struct {
/* This field need to be the first */
snd_pcm_plugin_t plug;
- int getput_idx;
+ unsigned int getput_idx;
alaw_f func;
- int sformat;
- int cformat;
- int cxfer_mode, cmmap_shape;
+ snd_pcm_format_t sformat;
} snd_pcm_alaw_t;
+#endif
+
static inline int val_seg(int val)
{
int r = 1;
return ((a_val & 0x80) ? t : -t);
}
-static void alaw_decode(snd_pcm_channel_area_t *src_areas,
- size_t src_offset,
- snd_pcm_channel_area_t *dst_areas,
- size_t dst_offset,
- size_t frames, size_t channels, int putidx)
+#ifndef DOC_HIDDEN
+
+void snd_pcm_alaw_decode(const snd_pcm_channel_area_t *dst_areas,
+ snd_pcm_uframes_t dst_offset,
+ const snd_pcm_channel_area_t *src_areas,
+ snd_pcm_uframes_t src_offset,
+ unsigned int channels, snd_pcm_uframes_t frames,
+ unsigned int putidx)
{
#define PUT16_LABELS
#include "plugin_ops.h"
#undef PUT16_LABELS
void *put = put16_labels[putidx];
- size_t channel;
+ unsigned int channel;
for (channel = 0; channel < channels; ++channel) {
- char *src;
+ const unsigned char *src;
char *dst;
int src_step, dst_step;
- size_t frames1;
- snd_pcm_channel_area_t *src_area = &src_areas[channel];
- snd_pcm_channel_area_t *dst_area = &dst_areas[channel];
-#if 0
- if (!src_area->enabled) {
- if (dst_area->wanted)
- snd_pcm_area_silence(&dst_areas[channel], dst_offset, frames, dst_sfmt);
- dst_area->enabled = 0;
- continue;
- }
- dst_area->enabled = 1;
-#endif
+ snd_pcm_uframes_t frames1;
+ const snd_pcm_channel_area_t *src_area = &src_areas[channel];
+ const snd_pcm_channel_area_t *dst_area = &dst_areas[channel];
src = snd_pcm_channel_area_addr(src_area, src_offset);
dst = snd_pcm_channel_area_addr(dst_area, dst_offset);
src_step = snd_pcm_channel_area_step(src_area);
}
}
-static void alaw_encode(snd_pcm_channel_area_t *src_areas,
- size_t src_offset,
- snd_pcm_channel_area_t *dst_areas,
- size_t dst_offset,
- size_t frames, size_t channels, int getidx)
+void snd_pcm_alaw_encode(const snd_pcm_channel_area_t *dst_areas,
+ snd_pcm_uframes_t dst_offset,
+ const snd_pcm_channel_area_t *src_areas,
+ snd_pcm_uframes_t src_offset,
+ unsigned int channels, snd_pcm_uframes_t frames,
+ unsigned int getidx)
{
#define GET16_LABELS
#include "plugin_ops.h"
#undef GET16_LABELS
void *get = get16_labels[getidx];
- size_t channel;
+ unsigned int channel;
int16_t sample = 0;
for (channel = 0; channel < channels; ++channel) {
- char *src;
+ const char *src;
char *dst;
int src_step, dst_step;
- size_t frames1;
- snd_pcm_channel_area_t *src_area = &src_areas[channel];
- snd_pcm_channel_area_t *dst_area = &dst_areas[channel];
-#if 0
- if (!src_area->enabled) {
- if (dst_area->wanted)
- snd_pcm_area_silence(&dst_area->area, 0, frames, dst_sfmt);
- dst_area->enabled = 0;
- continue;
- }
- dst_area->enabled = 1;
-#endif
+ snd_pcm_uframes_t frames1;
+ const snd_pcm_channel_area_t *src_area = &src_areas[channel];
+ const snd_pcm_channel_area_t *dst_area = &dst_areas[channel];
src = snd_pcm_channel_area_addr(src_area, src_offset);
dst = snd_pcm_channel_area_addr(dst_area, dst_offset);
src_step = snd_pcm_channel_area_step(src_area);
}
}
-static int snd_pcm_alaw_params_info(snd_pcm_t *pcm, snd_pcm_params_info_t * info)
+#endif /* DOC_HIDDEN */
+
+static int snd_pcm_alaw_hw_refine_cprepare(snd_pcm_t *pcm, snd_pcm_hw_params_t *params)
{
- snd_pcm_alaw_t *alaw = pcm->private;
- unsigned int req_mask = info->req_mask;
- unsigned int sfmt = info->req.format.sfmt;
+ snd_pcm_alaw_t *alaw = pcm->private_data;
int err;
- if (req_mask & SND_PCM_PARAMS_SFMT) {
- if (alaw->sformat == SND_PCM_SFMT_A_LAW ?
- !snd_pcm_format_linear(sfmt) :
- sfmt != SND_PCM_SFMT_A_LAW) {
- info->req.fail_mask = SND_PCM_PARAMS_SFMT;
- info->req.fail_reason = SND_PCM_PARAMS_FAIL_INVAL;
- return -EINVAL;
- }
+ snd_pcm_access_mask_t access_mask = { SND_PCM_ACCBIT_SHM };
+ err = _snd_pcm_hw_param_set_mask(params, SND_PCM_HW_PARAM_ACCESS,
+ &access_mask);
+ if (err < 0)
+ return err;
+ if (alaw->sformat == SND_PCM_FORMAT_A_LAW) {
+ snd_pcm_format_mask_t format_mask = { SND_PCM_FMTBIT_LINEAR };
+ err = _snd_pcm_hw_param_set_mask(params, SND_PCM_HW_PARAM_FORMAT,
+ &format_mask);
+ } else {
+ err = _snd_pcm_hw_params_set_format(params,
+ SND_PCM_FORMAT_A_LAW);
}
- info->req_mask |= SND_PCM_PARAMS_SFMT;
- info->req_mask &= ~(SND_PCM_PARAMS_MMAP_SHAPE |
- SND_PCM_PARAMS_XFER_MODE);
- info->req.format.sfmt = alaw->sformat;
- err = snd_pcm_params_info(alaw->plug.slave, info);
- info->req_mask = req_mask;
- info->req.format.sfmt = sfmt;
if (err < 0)
return err;
- if (req_mask & SND_PCM_PARAMS_SFMT)
- info->formats = 1 << sfmt;
- else
- info->formats = alaw->sformat == SND_PCM_SFMT_A_LAW ?
- SND_PCM_LINEAR_FORMATS : 1 << SND_PCM_SFMT_A_LAW;
- info->flags &= ~(SND_PCM_INFO_MMAP | SND_PCM_INFO_MMAP_VALID);
- info->flags |= SND_PCM_INFO_INTERLEAVED | SND_PCM_INFO_NONINTERLEAVED;
- return err;
+ err = _snd_pcm_hw_params_set_subformat(params, SND_PCM_SUBFORMAT_STD);
+ if (err < 0)
+ return err;
+ params->info &= ~(SND_PCM_INFO_MMAP | SND_PCM_INFO_MMAP_VALID);
+ return 0;
}
-static int snd_pcm_alaw_params(snd_pcm_t *pcm, snd_pcm_params_t * params)
+static int snd_pcm_alaw_hw_refine_sprepare(snd_pcm_t *pcm, snd_pcm_hw_params_t *sparams)
+{
+ snd_pcm_alaw_t *alaw = pcm->private_data;
+ snd_pcm_access_mask_t saccess_mask = { SND_PCM_ACCBIT_MMAP };
+ _snd_pcm_hw_params_any(sparams);
+ _snd_pcm_hw_param_set_mask(sparams, SND_PCM_HW_PARAM_ACCESS,
+ &saccess_mask);
+ _snd_pcm_hw_params_set_format(sparams, alaw->sformat);
+ _snd_pcm_hw_params_set_subformat(sparams, SND_PCM_SUBFORMAT_STD);
+ return 0;
+}
+
+static int snd_pcm_alaw_hw_refine_schange(snd_pcm_t *pcm ATTRIBUTE_UNUSED, snd_pcm_hw_params_t *params,
+ snd_pcm_hw_params_t *sparams)
{
- snd_pcm_alaw_t *alaw = pcm->private;
- snd_pcm_t *slave = alaw->plug.slave;
int err;
- if (alaw->sformat == SND_PCM_SFMT_A_LAW ?
- !snd_pcm_format_linear(params->format.sfmt) :
- params->format.sfmt != SND_PCM_SFMT_A_LAW) {
- params->fail_mask = SND_PCM_PARAMS_SFMT;
- params->fail_reason = SND_PCM_PARAMS_FAIL_INVAL;
- return -EINVAL;
- }
- alaw->cformat = params->format.sfmt;
- alaw->cxfer_mode = params->xfer_mode;
- alaw->cmmap_shape = params->mmap_shape;
- params->format.sfmt = alaw->sformat;
- params->xfer_mode = SND_PCM_XFER_UNSPECIFIED;
- params->mmap_shape = SND_PCM_MMAP_UNSPECIFIED;
- err = snd_pcm_params_mmap(slave, params);
- params->format.sfmt = alaw->cformat;
- params->xfer_mode = alaw->cxfer_mode;
- params->mmap_shape = alaw->cmmap_shape;
- return err;
+ unsigned int links = (SND_PCM_HW_PARBIT_CHANNELS |
+ SND_PCM_HW_PARBIT_RATE |
+ SND_PCM_HW_PARBIT_PERIOD_SIZE |
+ SND_PCM_HW_PARBIT_BUFFER_SIZE |
+ SND_PCM_HW_PARBIT_PERIODS |
+ SND_PCM_HW_PARBIT_PERIOD_TIME |
+ SND_PCM_HW_PARBIT_BUFFER_TIME |
+ SND_PCM_HW_PARBIT_TICK_TIME);
+ err = _snd_pcm_hw_params_refine(sparams, links, params);
+ if (err < 0)
+ return err;
+ return 0;
+}
+
+static int snd_pcm_alaw_hw_refine_cchange(snd_pcm_t *pcm ATTRIBUTE_UNUSED, snd_pcm_hw_params_t *params,
+ snd_pcm_hw_params_t *sparams)
+{
+ int err;
+ unsigned int links = (SND_PCM_HW_PARBIT_CHANNELS |
+ SND_PCM_HW_PARBIT_RATE |
+ SND_PCM_HW_PARBIT_PERIOD_SIZE |
+ SND_PCM_HW_PARBIT_BUFFER_SIZE |
+ SND_PCM_HW_PARBIT_PERIODS |
+ SND_PCM_HW_PARBIT_PERIOD_TIME |
+ SND_PCM_HW_PARBIT_BUFFER_TIME |
+ SND_PCM_HW_PARBIT_TICK_TIME);
+ err = _snd_pcm_hw_params_refine(params, links, sparams);
+ if (err < 0)
+ return err;
+ return 0;
+}
+
+static int snd_pcm_alaw_hw_refine(snd_pcm_t *pcm, snd_pcm_hw_params_t *params)
+{
+ return snd_pcm_hw_refine_slave(pcm, params,
+ snd_pcm_alaw_hw_refine_cprepare,
+ snd_pcm_alaw_hw_refine_cchange,
+ snd_pcm_alaw_hw_refine_sprepare,
+ snd_pcm_alaw_hw_refine_schange,
+ snd_pcm_generic_hw_refine);
}
-static int snd_pcm_alaw_setup(snd_pcm_t *pcm, snd_pcm_setup_t * setup)
+static int snd_pcm_alaw_hw_params(snd_pcm_t *pcm, snd_pcm_hw_params_t * params)
{
- snd_pcm_alaw_t *alaw = pcm->private;
- int err = snd_pcm_setup(alaw->plug.slave, setup);
+ snd_pcm_alaw_t *alaw = pcm->private_data;
+ snd_pcm_format_t format;
+ int err = snd_pcm_hw_params_slave(pcm, params,
+ snd_pcm_alaw_hw_refine_cchange,
+ snd_pcm_alaw_hw_refine_sprepare,
+ snd_pcm_alaw_hw_refine_schange,
+ snd_pcm_generic_hw_params);
if (err < 0)
return err;
- assert(alaw->sformat == setup->format.sfmt);
- if (alaw->cxfer_mode == SND_PCM_XFER_UNSPECIFIED)
- setup->xfer_mode = SND_PCM_XFER_NONINTERLEAVED;
- else
- setup->xfer_mode = alaw->cxfer_mode;
- if (alaw->cmmap_shape == SND_PCM_MMAP_UNSPECIFIED)
- setup->mmap_shape = SND_PCM_MMAP_NONINTERLEAVED;
- else
- setup->mmap_shape = alaw->cmmap_shape;
- setup->format.sfmt = alaw->cformat;
- setup->mmap_bytes = 0;
+
+ err = INTERNAL(snd_pcm_hw_params_get_format)(params, &format);
+ if (err < 0)
+ return err;
+
if (pcm->stream == SND_PCM_STREAM_PLAYBACK) {
- if (alaw->sformat == SND_PCM_SFMT_A_LAW) {
- alaw->getput_idx = get_index(alaw->cformat, SND_PCM_SFMT_S16);
- alaw->func = alaw_encode;
+ if (alaw->sformat == SND_PCM_FORMAT_A_LAW) {
+ alaw->getput_idx = snd_pcm_linear_get_index(format, SND_PCM_FORMAT_S16);
+ alaw->func = snd_pcm_alaw_encode;
} else {
- alaw->getput_idx = put_index(SND_PCM_SFMT_S16, alaw->sformat);
- alaw->func = alaw_decode;
+ alaw->getput_idx = snd_pcm_linear_put_index(SND_PCM_FORMAT_S16, alaw->sformat);
+ alaw->func = snd_pcm_alaw_decode;
}
} else {
- if (alaw->sformat == SND_PCM_SFMT_A_LAW) {
- alaw->getput_idx = put_index(SND_PCM_SFMT_S16, alaw->cformat);
- alaw->func = alaw_decode;
+ if (alaw->sformat == SND_PCM_FORMAT_A_LAW) {
+ alaw->getput_idx = snd_pcm_linear_put_index(SND_PCM_FORMAT_S16, format);
+ alaw->func = snd_pcm_alaw_decode;
} else {
- alaw->getput_idx = get_index(alaw->sformat, SND_PCM_SFMT_S16);
- alaw->func = alaw_encode;
+ alaw->getput_idx = snd_pcm_linear_get_index(alaw->sformat, SND_PCM_FORMAT_S16);
+ alaw->func = snd_pcm_alaw_encode;
}
}
return 0;
}
-static ssize_t snd_pcm_alaw_write_areas(snd_pcm_t *pcm,
- snd_pcm_channel_area_t *areas,
- size_t offset,
- size_t size,
- size_t *slave_sizep)
+static snd_pcm_uframes_t
+snd_pcm_alaw_write_areas(snd_pcm_t *pcm,
+ const snd_pcm_channel_area_t *areas,
+ snd_pcm_uframes_t offset,
+ snd_pcm_uframes_t size,
+ const snd_pcm_channel_area_t *slave_areas,
+ snd_pcm_uframes_t slave_offset,
+ snd_pcm_uframes_t *slave_sizep)
{
- snd_pcm_alaw_t *alaw = pcm->private;
- snd_pcm_t *slave = alaw->plug.slave;
- size_t xfer = 0;
- ssize_t err = 0;
- if (slave_sizep && *slave_sizep < size)
+ snd_pcm_alaw_t *alaw = pcm->private_data;
+ if (size > *slave_sizep)
size = *slave_sizep;
- assert(size > 0);
- while (xfer < size) {
- size_t frames = snd_pcm_mmap_playback_xfer(slave, size - xfer);
- alaw->func(areas, offset,
- snd_pcm_mmap_areas(slave), snd_pcm_mmap_offset(slave),
- frames, pcm->setup.format.channels,
- alaw->getput_idx);
- err = snd_pcm_mmap_forward(slave, frames);
- if (err < 0)
- break;
- assert((size_t)err == frames);
- offset += err;
- xfer += err;
- snd_pcm_mmap_hw_forward(pcm, err);
- }
- if (xfer > 0) {
- if (slave_sizep)
- *slave_sizep = xfer;
- return xfer;
- }
- return err;
+ alaw->func(slave_areas, slave_offset,
+ areas, offset,
+ pcm->channels, size,
+ alaw->getput_idx);
+ *slave_sizep = size;
+ return size;
}
-static ssize_t snd_pcm_alaw_read_areas(snd_pcm_t *pcm,
- snd_pcm_channel_area_t *areas,
- size_t offset,
- size_t size,
- size_t *slave_sizep)
+static snd_pcm_uframes_t
+snd_pcm_alaw_read_areas(snd_pcm_t *pcm,
+ const snd_pcm_channel_area_t *areas,
+ snd_pcm_uframes_t offset,
+ snd_pcm_uframes_t size,
+ const snd_pcm_channel_area_t *slave_areas,
+ snd_pcm_uframes_t slave_offset,
+ snd_pcm_uframes_t *slave_sizep)
{
- snd_pcm_alaw_t *alaw = pcm->private;
- snd_pcm_t *slave = alaw->plug.slave;
- size_t xfer = 0;
- ssize_t err = 0;
- if (slave_sizep && *slave_sizep < size)
+ snd_pcm_alaw_t *alaw = pcm->private_data;
+ if (size > *slave_sizep)
size = *slave_sizep;
- assert(size > 0);
- while (xfer < size) {
- size_t frames = snd_pcm_mmap_capture_xfer(slave, size - xfer);
- alaw->func(snd_pcm_mmap_areas(slave), snd_pcm_mmap_offset(slave),
- areas, offset,
- frames, pcm->setup.format.channels,
- alaw->getput_idx);
- err = snd_pcm_mmap_forward(slave, frames);
- if (err < 0)
- break;
- assert((size_t)err == frames);
- offset += err;
- xfer += err;
- snd_pcm_mmap_hw_forward(pcm, err);
- }
- if (xfer > 0) {
- if (slave_sizep)
- *slave_sizep = xfer;
- return xfer;
- }
- return err;
+ alaw->func(areas, offset,
+ slave_areas, slave_offset,
+ pcm->channels, size,
+ alaw->getput_idx);
+ *slave_sizep = size;
+ return size;
}
-static void snd_pcm_alaw_dump(snd_pcm_t *pcm, FILE *fp)
+static void snd_pcm_alaw_dump(snd_pcm_t *pcm, snd_output_t *out)
{
- snd_pcm_alaw_t *alaw = pcm->private;
- fprintf(fp, "A-Law conversion PCM (%s)\n",
+ snd_pcm_alaw_t *alaw = pcm->private_data;
+ snd_output_printf(out, "A-Law conversion PCM (%s)\n",
snd_pcm_format_name(alaw->sformat));
- if (pcm->valid_setup) {
- fprintf(fp, "Its setup is:\n");
- snd_pcm_dump_setup(pcm, fp);
+ if (pcm->setup) {
+ snd_output_printf(out, "Its setup is:\n");
+ snd_pcm_dump_setup(pcm, out);
}
- fprintf(fp, "Slave: ");
- snd_pcm_dump(alaw->plug.slave, fp);
+ snd_output_printf(out, "Slave: ");
+ snd_pcm_dump(alaw->plug.gen.slave, out);
}
-snd_pcm_ops_t snd_pcm_alaw_ops = {
- close: snd_pcm_plugin_close,
- info: snd_pcm_plugin_info,
- params_info: snd_pcm_alaw_params_info,
- params: snd_pcm_alaw_params,
- setup: snd_pcm_alaw_setup,
- channel_info: snd_pcm_plugin_channel_info,
- channel_params: snd_pcm_plugin_channel_params,
- channel_setup: snd_pcm_plugin_channel_setup,
- dump: snd_pcm_alaw_dump,
- nonblock: snd_pcm_plugin_nonblock,
- async: snd_pcm_plugin_async,
- mmap: snd_pcm_plugin_mmap,
- munmap: snd_pcm_plugin_munmap,
+static const snd_pcm_ops_t snd_pcm_alaw_ops = {
+ .close = snd_pcm_generic_close,
+ .info = snd_pcm_generic_info,
+ .hw_refine = snd_pcm_alaw_hw_refine,
+ .hw_params = snd_pcm_alaw_hw_params,
+ .hw_free = snd_pcm_generic_hw_free,
+ .sw_params = snd_pcm_generic_sw_params,
+ .channel_info = snd_pcm_generic_channel_info,
+ .dump = snd_pcm_alaw_dump,
+ .nonblock = snd_pcm_generic_nonblock,
+ .async = snd_pcm_generic_async,
+ .mmap = snd_pcm_generic_mmap,
+ .munmap = snd_pcm_generic_munmap,
+ .query_chmaps = snd_pcm_generic_query_chmaps,
+ .get_chmap = snd_pcm_generic_get_chmap,
+ .set_chmap = snd_pcm_generic_set_chmap,
};
-int snd_pcm_alaw_open(snd_pcm_t **pcmp, char *name, int sformat, snd_pcm_t *slave, int close_slave)
+/**
+ * \brief Creates a new A-Law conversion PCM
+ * \param pcmp Returns created PCM handle
+ * \param name Name of PCM
+ * \param sformat Slave (destination) format
+ * \param slave Slave PCM handle
+ * \param close_slave When set, the slave PCM handle is closed with copy PCM
+ * \retval zero on success otherwise a negative error code
+ * \warning Using of this function might be dangerous in the sense
+ * of compatibility reasons. The prototype might be freely
+ * changed in future.
+ */
+int snd_pcm_alaw_open(snd_pcm_t **pcmp, const char *name, snd_pcm_format_t sformat, snd_pcm_t *slave, int close_slave)
{
snd_pcm_t *pcm;
snd_pcm_alaw_t *alaw;
+ int err;
assert(pcmp && slave);
if (snd_pcm_format_linear(sformat) != 1 &&
- sformat != SND_PCM_SFMT_A_LAW)
+ sformat != SND_PCM_FORMAT_A_LAW)
return -EINVAL;
alaw = calloc(1, sizeof(snd_pcm_alaw_t));
if (!alaw) {
return -ENOMEM;
}
+ snd_pcm_plugin_init(&alaw->plug);
alaw->sformat = sformat;
alaw->plug.read = snd_pcm_alaw_read_areas;
alaw->plug.write = snd_pcm_alaw_write_areas;
- alaw->plug.slave = slave;
- alaw->plug.close_slave = close_slave;
+ alaw->plug.undo_read = snd_pcm_plugin_undo_read_generic;
+ alaw->plug.undo_write = snd_pcm_plugin_undo_write_generic;
+ alaw->plug.gen.slave = slave;
+ alaw->plug.gen.close_slave = close_slave;
- pcm = calloc(1, sizeof(snd_pcm_t));
- if (!pcm) {
+ err = snd_pcm_new(&pcm, SND_PCM_TYPE_ALAW, name, slave->stream, slave->mode);
+ if (err < 0) {
free(alaw);
- return -ENOMEM;
+ return err;
}
- if (name)
- pcm->name = strdup(name);
- pcm->type = SND_PCM_TYPE_ALAW;
- pcm->stream = slave->stream;
- pcm->mode = slave->mode;
pcm->ops = &snd_pcm_alaw_ops;
- pcm->op_arg = pcm;
pcm->fast_ops = &snd_pcm_plugin_fast_ops;
- pcm->fast_op_arg = pcm;
- pcm->private = alaw;
+ pcm->private_data = alaw;
pcm->poll_fd = slave->poll_fd;
- pcm->hw_ptr = &alaw->plug.hw_ptr;
- pcm->appl_ptr = &alaw->plug.appl_ptr;
+ pcm->poll_events = slave->poll_events;
+ pcm->tstamp_type = slave->tstamp_type;
+ snd_pcm_set_hw_ptr(pcm, &alaw->plug.hw_ptr, -1, 0);
+ snd_pcm_set_appl_ptr(pcm, &alaw->plug.appl_ptr, -1, 0);
*pcmp = pcm;
return 0;
}
-int _snd_pcm_alaw_open(snd_pcm_t **pcmp, char *name,
- snd_config_t *conf,
- int stream, int mode)
+/*! \page pcm_plugins
+
+\section pcm_plugins_alaw Plugin: A-Law
+
+This plugin converts A-Law samples to linear or linear to A-Law samples
+from master A-Law conversion PCM to given slave PCM. The channel count,
+format and rate must match for both of them.
+
+\code
+pcm.name {
+ type alaw # A-Law conversion PCM
+ slave STR # Slave name
+ # or
+ slave { # Slave definition
+ pcm STR # Slave PCM name
+ # or
+ pcm { } # Slave PCM definition
+ format STR # Slave format
+ }
+}
+\endcode
+
+\subsection pcm_plugins_alaw_funcref Function reference
+
+<UL>
+ <LI>snd_pcm_alaw_open()
+ <LI>_snd_pcm_alaw_open()
+</UL>
+
+*/
+
+/**
+ * \brief Creates a new A-Law conversion PCM
+ * \param pcmp Returns created PCM handle
+ * \param name Name of PCM
+ * \param root Root configuration node
+ * \param conf Configuration node with copy PCM description
+ * \param stream Stream type
+ * \param mode Stream mode
+ * \retval zero on success otherwise a negative error code
+ * \warning Using of this function might be dangerous in the sense
+ * of compatibility reasons. The prototype might be freely
+ * changed in future.
+ */
+int _snd_pcm_alaw_open(snd_pcm_t **pcmp, const char *name,
+ snd_config_t *root, snd_config_t *conf,
+ snd_pcm_stream_t stream, int mode)
{
- snd_config_iterator_t i;
- char *sname = NULL;
+ snd_config_iterator_t i, next;
int err;
snd_pcm_t *spcm;
- int sformat = -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)
+ snd_config_t *slave = NULL, *sconf;
+ snd_pcm_format_t sformat;
+ 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(n->id, "sname") == 0) {
- err = snd_config_string_get(n, &sname);
- if (err < 0)
- return -EINVAL;
+ if (snd_pcm_conf_generic_id(id))
continue;
- }
- if (strcmp(n->id, "sformat") == 0) {
- char *f;
- err = snd_config_string_get(n, &f);
- if (err < 0)
- return -EINVAL;
- sformat = snd_pcm_format_value(f);
- if (sformat < 0)
- return -EINVAL;
- if (snd_pcm_format_linear(sformat) != 1 &&
- sformat != SND_PCM_SFMT_A_LAW)
- return -EINVAL;
+ if (strcmp(id, "slave") == 0) {
+ slave = n;
continue;
}
+ SNDERR("Unknown field %s", id);
return -EINVAL;
}
- if (!sname || !sformat)
+ if (!slave) {
+ SNDERR("slave is not defined");
return -EINVAL;
- /* 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);
+ }
+ err = snd_pcm_slave_conf(root, slave, &sconf, 1,
+ SND_PCM_HW_PARAM_FORMAT, SCONF_MANDATORY, &sformat);
+ if (err < 0)
+ return err;
+ if (snd_pcm_format_linear(sformat) != 1 &&
+ sformat != SND_PCM_FORMAT_A_LAW) {
+ snd_config_delete(sconf);
+ SNDERR("invalid slave format");
+ return -EINVAL;
+ }
+ err = snd_pcm_open_slave(&spcm, root, sconf, stream, mode, conf);
+ snd_config_delete(sconf);
if (err < 0)
return err;
err = snd_pcm_alaw_open(pcmp, name, sformat, spcm, 1);
snd_pcm_close(spcm);
return err;
}
-
-
+#ifndef DOC_HIDDEN
+SND_DLSYM_BUILD_VERSION(_snd_pcm_alaw_open, SND_PCM_DLSYM_VERSION);
+#endif
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