/**
* \file pcm/pcm_iec958.c
* \ingroup PCM_Plugins
* \brief PCM IEC958 Subframe Conversion Plugin Interface
* \author Takashi Iwai <tiwai@suse.de>
* \date 2004
*/
/*
* PCM - IEC958 Subframe Conversion Plugin
* Copyright (c) 2004 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#include "bswap.h"
#include "pcm_local.h"
#include "pcm_plugin.h"
#include "plugin_ops.h"
#ifndef PIC
/* entry for static linking */
const char *_snd_module_pcm_iec958 = "";
#endif
/*
*/
#ifndef DOC_HIDDEN
typedef struct snd_pcm_iec958 snd_pcm_iec958_t;
typedef void (*iec958_f)(snd_pcm_iec958_t *iec,
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);
struct snd_pcm_iec958 {
/* This field need to be the first */
snd_pcm_plugin_t plug;
unsigned int getput_idx;
iec958_f func;
snd_pcm_format_t sformat;
snd_pcm_format_t format;
unsigned int counter;
unsigned char status[24];
unsigned int byteswap;
unsigned char preamble[3]; /* B/M/W or Z/X/Y */
snd_pcm_fast_ops_t fops;
int hdmi_mode;
};
enum { PREAMBLE_Z, PREAMBLE_X, PREAMBLE_Y };
#endif /* DOC_HIDDEN */
/*
* Determine parity for time slots 4 upto 30
* to be sure that bit 4 upt 31 will carry
* an even number of ones and zeros.
*/
static unsigned int iec958_parity(unsigned int data)
{
unsigned int parity;
int bit;
data >>= 4; /* start from bit 4 */
parity = 0;
for (bit = 4; bit <= 30; bit++) {
if (data & 1)
parity++;
data >>= 1;
}
return (parity & 1);
}
/*
* Compose 32bit IEC958 subframe, two sub frames
* build one frame with two channels.
*
* bit 0-3 = preamble
* 4-7 = AUX (=0)
* 8-27 = data (12-27 for 16bit, 8-27 for 20bit, and 24bit without AUX)
* 28 = validity (0 for valid data, else 'in error')
* 29 = user data (0)
* 30 = channel status (24 bytes for 192 frames)
* 31 = parity
*/
static inline uint32_t iec958_subframe(snd_pcm_iec958_t *iec, uint32_t data, int channel)
{
unsigned int byte = iec->counter >> 3;
unsigned int mask = 1 << (iec->counter - (byte << 3));
/* bit 4-27 */
data >>= 4;
data &= ~0xf;
/* set IEC status bits (up to 192 bits) */
if (iec->status[byte] & mask)
data |= 0x40000000;
if (iec958_parity(data)) /* parity bit 4-30 */
data |= 0x80000000;
/* Preamble */
if (channel)
data |= iec->preamble[PREAMBLE_Y]; /* odd sub frame, 'Y' */
else if (! iec->counter)
data |= iec->preamble[PREAMBLE_Z]; /* Block start, 'Z' */
else
data |= iec->preamble[PREAMBLE_X]; /* even sub frame, 'X' */
if (iec->byteswap)
data = bswap_32(data);
return data;
}
static inline int32_t iec958_to_s32(snd_pcm_iec958_t *iec, uint32_t data)
{
if (iec->byteswap)
data = bswap_32(data);
data &= ~0xf;
data <<= 4;
return (int32_t)data;
}
#ifndef DOC_HIDDEN
static void snd_pcm_iec958_decode(snd_pcm_iec958_t *iec,
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)
{
#define PUT32_LABELS
#include "plugin_ops.h"
#undef PUT32_LABELS
void *put = put32_labels[iec->getput_idx];
unsigned int channel;
for (channel = 0; channel < channels; ++channel) {
const uint32_t *src;
char *dst;
int src_step, dst_step;
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) / sizeof(uint32_t);
dst_step = snd_pcm_channel_area_step(dst_area);
frames1 = frames;
while (frames1-- > 0) {
int32_t sample = iec958_to_s32(iec, *src);
goto *put;
#define PUT32_END after
#include "plugin_ops.h"
#undef PUT32_END
after:
src += src_step;
dst += dst_step;
}
}
}
static void snd_pcm_iec958_encode(snd_pcm_iec958_t *iec,
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)
{
#define GET32_LABELS
#include "plugin_ops.h"
#undef GET32_LABELS
void *get = get32_labels[iec->getput_idx];
unsigned int channel;
int32_t sample = 0;
int counter = iec->counter;
int single_stream = iec->hdmi_mode &&
(iec->status[0] & IEC958_AES0_NONAUDIO) &&
(channels == 8);
int counter_step = single_stream ? ((channels + 1) >> 1) : 1;
for (channel = 0; channel < channels; ++channel) {
const char *src;
uint32_t *dst;
int src_step, dst_step;
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);
dst_step = snd_pcm_channel_area_step(dst_area) / sizeof(uint32_t);
frames1 = frames;
if (single_stream)
iec->counter = (counter + (channel >> 1)) % 192;
else
iec->counter = counter;
while (frames1-- > 0) {
goto *get;
#define GET32_END after
#include "plugin_ops.h"
#undef GET32_END
after:
sample = iec958_subframe(iec, sample, channel);
// fprintf(stderr, "%d:%08x\n", frames1, sample);
*dst = sample;
src += src_step;
dst += dst_step;
iec->counter += counter_step;
iec->counter %= 192;
}
if (single_stream) /* set counter to ch0 value for next iteration */
iec->counter = (counter + frames * counter_step) % 192;
}
}
#endif /* DOC_HIDDEN */
static int snd_pcm_iec958_hw_refine_cprepare(snd_pcm_t *pcm, snd_pcm_hw_params_t *params)
{
snd_pcm_iec958_t *iec = pcm->private_data;
int err;
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 (iec->sformat == SND_PCM_FORMAT_IEC958_SUBFRAME_LE ||
iec->sformat == SND_PCM_FORMAT_IEC958_SUBFRAME_BE) {
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 {
snd_pcm_format_mask_t format_mask = {
{ (1U << SND_PCM_FORMAT_IEC958_SUBFRAME_LE) |
(1U << SND_PCM_FORMAT_IEC958_SUBFRAME_BE) }
};
err = _snd_pcm_hw_param_set_mask(params, SND_PCM_HW_PARAM_FORMAT,
&format_mask);
}
if (err < 0)
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_iec958_hw_refine_sprepare(snd_pcm_t *pcm, snd_pcm_hw_params_t *sparams)
{
snd_pcm_iec958_t *iec = 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, iec->sformat);
_snd_pcm_hw_params_set_subformat(sparams, SND_PCM_SUBFORMAT_STD);
return 0;
}
static int snd_pcm_iec958_hw_refine_schange(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(sparams, links, params);
if (err < 0)
return err;
return 0;
}
static int snd_pcm_iec958_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_iec958_hw_refine(snd_pcm_t *pcm, snd_pcm_hw_params_t *params)
{
return snd_pcm_hw_refine_slave(pcm, params,
snd_pcm_iec958_hw_refine_cprepare,
snd_pcm_iec958_hw_refine_cchange,
snd_pcm_iec958_hw_refine_sprepare,
snd_pcm_iec958_hw_refine_schange,
snd_pcm_generic_hw_refine);
}
static int snd_pcm_iec958_hw_params(snd_pcm_t *pcm, snd_pcm_hw_params_t * params)
{
snd_pcm_iec958_t *iec = pcm->private_data;
snd_pcm_format_t format;
int err = snd_pcm_hw_params_slave(pcm, params,
snd_pcm_iec958_hw_refine_cchange,
snd_pcm_iec958_hw_refine_sprepare,
snd_pcm_iec958_hw_refine_schange,
snd_pcm_generic_hw_params);
if (err < 0)
return err;
err = INTERNAL(snd_pcm_hw_params_get_format)(params, &format);
if (err < 0)
return err;
iec->format = format;
if (pcm->stream == SND_PCM_STREAM_PLAYBACK) {
if (iec->sformat == SND_PCM_FORMAT_IEC958_SUBFRAME_LE ||
iec->sformat == SND_PCM_FORMAT_IEC958_SUBFRAME_BE) {
iec->getput_idx = snd_pcm_linear_get_index(format, SND_PCM_FORMAT_S32);
iec->func = snd_pcm_iec958_encode;
iec->byteswap = iec->sformat != SND_PCM_FORMAT_IEC958_SUBFRAME;
} else {
iec->getput_idx = snd_pcm_linear_put_index(SND_PCM_FORMAT_S32, iec->sformat);
iec->func = snd_pcm_iec958_decode;
iec->byteswap = format != SND_PCM_FORMAT_IEC958_SUBFRAME;
}
} else {
if (iec->sformat == SND_PCM_FORMAT_IEC958_SUBFRAME_LE ||
iec->sformat == SND_PCM_FORMAT_IEC958_SUBFRAME_BE) {
iec->getput_idx = snd_pcm_linear_put_index(SND_PCM_FORMAT_S32, format);
iec->func = snd_pcm_iec958_decode;
iec->byteswap = iec->sformat != SND_PCM_FORMAT_IEC958_SUBFRAME;
} else {
iec->getput_idx = snd_pcm_linear_get_index(iec->sformat, SND_PCM_FORMAT_S32);
iec->func = snd_pcm_iec958_encode;
iec->byteswap = format != SND_PCM_FORMAT_IEC958_SUBFRAME;
}
}
if ((iec->status[0] & IEC958_AES0_PROFESSIONAL) == 0) {
if ((iec->status[3] & IEC958_AES3_CON_FS) == IEC958_AES3_CON_FS_NOTID) {
unsigned int rate = 0;
unsigned char fs;
err = INTERNAL(snd_pcm_hw_params_get_rate)(params, &rate, 0);
if (err < 0)
rate = 0;
switch (rate) {
case 22050:
fs = IEC958_AES3_CON_FS_22050;
break;
case 24000:
fs = IEC958_AES3_CON_FS_24000;
break;
case 32000:
fs = IEC958_AES3_CON_FS_32000;
break;
case 44100:
fs = IEC958_AES3_CON_FS_44100;
break;
case 48000:
fs = IEC958_AES3_CON_FS_48000;
break;
case 88200:
fs = IEC958_AES3_CON_FS_88200;
break;
case 96000:
fs = IEC958_AES3_CON_FS_96000;
break;
case 176400:
fs = IEC958_AES3_CON_FS_176400;
break;
case 192000:
fs = IEC958_AES3_CON_FS_192000;
break;
case 768000:
fs = IEC958_AES3_CON_FS_768000;
break;
default:
fs = IEC958_AES3_CON_FS_NOTID;
break;
}
iec->status[3] &= ~IEC958_AES3_CON_FS;
iec->status[3] |= fs;
}
if ((iec->status[4] & IEC958_AES4_CON_WORDLEN) == IEC958_AES4_CON_WORDLEN_NOTID) {
unsigned char ws;
switch (snd_pcm_format_width(format)) {
case 16:
ws = IEC958_AES4_CON_WORDLEN_20_16;
break;
case 18:
ws = IEC958_AES4_CON_WORDLEN_22_18;
break;
case 20:
ws = IEC958_AES4_CON_WORDLEN_20_16 | IEC958_AES4_CON_MAX_WORDLEN_24;
break;
case 24:
case 32: /* Assume 24-bit width for 32-bit samples. */
ws = IEC958_AES4_CON_WORDLEN_24_20 | IEC958_AES4_CON_MAX_WORDLEN_24;
break;
default:
ws = IEC958_AES4_CON_WORDLEN_NOTID;
break;
}
iec->status[4] &= ~(IEC958_AES4_CON_MAX_WORDLEN_24 | IEC958_AES4_CON_WORDLEN);
iec->status[4] |= ws;
}
}
return 0;
}
static snd_pcm_uframes_t
snd_pcm_iec958_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_iec958_t *iec = pcm->private_data;
if (size > *slave_sizep)
size = *slave_sizep;
iec->func(iec, slave_areas, slave_offset,
areas, offset,
pcm->channels, size);
*slave_sizep = size;
return size;
}
static snd_pcm_uframes_t
snd_pcm_iec958_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_iec958_t *iec = pcm->private_data;
if (size > *slave_sizep)
size = *slave_sizep;
iec->func(iec, areas, offset,
slave_areas, slave_offset,
pcm->channels, size);
*slave_sizep = size;
return size;
}
static int snd_pcm_iec958_init(snd_pcm_t *pcm)
{
snd_pcm_iec958_t *iec = pcm->private_data;
iec->counter = 0;
return 0;
}
static void snd_pcm_iec958_dump(snd_pcm_t *pcm, snd_output_t *out)
{
snd_pcm_iec958_t *iec = pcm->private_data;
snd_output_printf(out, "IEC958 subframe conversion PCM (%s)\n",
snd_pcm_format_name(iec->sformat));
if (pcm->setup) {
snd_output_printf(out, "Its setup is:\n");
snd_pcm_dump_setup(pcm, out);
}
snd_output_printf(out, "Slave: ");
snd_pcm_dump(iec->plug.gen.slave, out);
}
static snd_pcm_sframes_t snd_pcm_iec958_rewind(snd_pcm_t *pcm, snd_pcm_uframes_t frames)
{
unsigned int counter_decrement;
snd_pcm_iec958_t *iec = pcm->private_data;
snd_pcm_sframes_t result = snd_pcm_plugin_rewind(pcm, frames);
if (result <= 0)
return result;
counter_decrement = result % 192;
iec->counter += 192 - counter_decrement;
iec->counter %= 192;
return result;
}
static snd_pcm_sframes_t snd_pcm_iec958_forward(snd_pcm_t *pcm, snd_pcm_uframes_t frames)
{
unsigned int counter_increment;
snd_pcm_iec958_t *iec = pcm->private_data;
snd_pcm_sframes_t result = snd_pcm_plugin_rewind(pcm, frames);
if (result <= 0)
return result;
counter_increment = result % 192;
iec->counter += counter_increment;
iec->counter %= 192;
return result;
}
static const snd_pcm_ops_t snd_pcm_iec958_ops = {
.close = snd_pcm_generic_close,
.info = snd_pcm_generic_info,
.hw_refine = snd_pcm_iec958_hw_refine,
.hw_params = snd_pcm_iec958_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_iec958_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,
};
/**
* \brief Creates a new IEC958 subframe 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
* \param status_bits The IEC958 status bits
* \param preamble_vals The preamble byte values
* \param hdmi_mode When set, enable HDMI compliant formatting
* \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_iec958_open(snd_pcm_t **pcmp, const char *name, snd_pcm_format_t sformat,
snd_pcm_t *slave, int close_slave,
const unsigned char *status_bits,
const unsigned char *preamble_vals,
int hdmi_mode)
{
snd_pcm_t *pcm;
snd_pcm_iec958_t *iec;
int err;
static const unsigned char default_status_bits[] = {
IEC958_AES0_CON_EMPHASIS_NONE,
IEC958_AES1_CON_ORIGINAL | IEC958_AES1_CON_PCM_CODER,
0,
IEC958_AES3_CON_FS_NOTID, /* will be set in hwparams */
IEC958_AES4_CON_WORDLEN_NOTID /* will be set in hwparams */
};
assert(pcmp && slave);
if (snd_pcm_format_linear(sformat) != 1 &&
sformat != SND_PCM_FORMAT_IEC958_SUBFRAME_LE &&
sformat != SND_PCM_FORMAT_IEC958_SUBFRAME_BE)
return -EINVAL;
iec = calloc(1, sizeof(snd_pcm_iec958_t));
if (!iec) {
return -ENOMEM;
}
snd_pcm_plugin_init(&iec->plug);
iec->sformat = sformat;
iec->plug.read = snd_pcm_iec958_read_areas;
iec->plug.write = snd_pcm_iec958_write_areas;
iec->plug.init = snd_pcm_iec958_init;
iec->plug.undo_read = snd_pcm_plugin_undo_read_generic;
iec->plug.undo_write = snd_pcm_plugin_undo_write_generic;
iec->plug.gen.slave = slave;
iec->plug.gen.close_slave = close_slave;
if (status_bits)
memcpy(iec->status, status_bits, sizeof(iec->status));
else
memcpy(iec->status, default_status_bits, sizeof(default_status_bits));
memcpy(iec->preamble, preamble_vals, 3);
iec->hdmi_mode = hdmi_mode;
err = snd_pcm_new(&pcm, SND_PCM_TYPE_IEC958, name, slave->stream, slave->mode);
if (err < 0) {
free(iec);
return err;
}
pcm->ops = &snd_pcm_iec958_ops;
iec->fops = snd_pcm_plugin_fast_ops;
iec->fops.rewind = snd_pcm_iec958_rewind;
iec->fops.forward = snd_pcm_iec958_forward;
pcm->fast_ops = &iec->fops;
pcm->private_data = iec;
pcm->poll_fd = slave->poll_fd;
pcm->poll_events = slave->poll_events;
pcm->tstamp_type = slave->tstamp_type;
snd_pcm_set_hw_ptr(pcm, &iec->plug.hw_ptr, -1, 0);
snd_pcm_set_appl_ptr(pcm, &iec->plug.appl_ptr, -1, 0);
*pcmp = pcm;
return 0;
}
/*! \page pcm_plugins
\section pcm_plugins_iec958 Plugin: IEC958
This plugin converts 32bit IEC958 subframe samples to linear, or linear to
32bit IEC958 subframe samples.
\code
pcm.name {
type iec958 # IEC958 subframe conversion PCM
slave STR # Slave name
# or
slave { # Slave definition
pcm STR # Slave PCM name
# or
pcm { } # Slave PCM definition
}
[status status-bytes] # IEC958 status bits (given in byte array)
# IEC958 preamble bits definitions
# B/M/W or Z/X/Y, B = block start, M = even subframe, W = odd subframe
# As default, Z = 0x08, Y = 0x04, X = 0x02
[preamble.z or preamble.b val]
[preamble.x or preamble.m val]
[preamble.y or preamble.w val]
[hdmi_mode true]
}
\endcode
When <code>hdmi_mode</code> is true, 8-channel compressed data is
formatted as 4 contiguous frames of a single IEC958 stream as required
by the HDMI HBR specification.
\subsection pcm_plugins_iec958_funcref Function reference
<UL>
<LI>snd_pcm_iec958_open()
<LI>_snd_pcm_iec958_open()
</UL>
*/
/**
* \brief Creates a new IEC958 subframe 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_iec958_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, next;
int err;
snd_pcm_t *spcm;
snd_config_t *slave = NULL, *sconf;
snd_config_t *status = NULL, *preamble = NULL;
snd_pcm_format_t sformat;
unsigned char status_bits[24];
unsigned char preamble_vals[3] = {
0x08, 0x02, 0x04 /* Z, X, Y */
};
int hdmi_mode = 0;
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 (snd_pcm_conf_generic_id(id))
continue;
if (strcmp(id, "slave") == 0) {
slave = n;
continue;
}
if (strcmp(id, "status") == 0) {
if (snd_config_get_type(n) != SND_CONFIG_TYPE_COMPOUND) {
SNDERR("Invalid type for %s", id);
return -EINVAL;
}
status = n;
continue;
}
if (strcmp(id, "preamble") == 0) {
if (snd_config_get_type(n) != SND_CONFIG_TYPE_COMPOUND) {
SNDERR("Invalid type for %s", id);
return -EINVAL;
}
preamble = n;
continue;
}
if (strcmp(id, "hdmi_mode") == 0) {
err = snd_config_get_bool(n);
if (err < 0)
continue;
hdmi_mode = err;
continue;
}
SNDERR("Unknown field %s", id);
return -EINVAL;
}
memset(status_bits, 0, sizeof(status_bits));
if (status) {
snd_config_iterator_t i, inext;
int bytes = 0;
snd_config_for_each(i, inext, status) {
long val;
snd_config_t *n = snd_config_iterator_entry(i);
if (snd_config_get_type(n) != SND_CONFIG_TYPE_INTEGER) {
SNDERR("invalid IEC958 status bits");
return -EINVAL;
}
err = snd_config_get_integer(n, &val);
if (err < 0) {
SNDERR("invalid IEC958 status bits");
return err;
}
status_bits[bytes] = val;
bytes++;
if (bytes >= (int)sizeof(status_bits))
break;
}
// fprintf(stderr, "STATUS bits: %02x %02x %02x %02x\n", status_bits[0], status_bits[1], status_bits[2], status_bits[3]);
}
if (preamble) {
snd_config_iterator_t i, inext;
snd_config_for_each(i, inext, preamble) {
long val;
snd_config_t *n = snd_config_iterator_entry(i);
const char *id;
int idx;
if (snd_config_get_id(n, &id) < 0)
continue;
if (strcmp(id, "b") == 0 || strcmp(id, "z") == 0)
idx = PREAMBLE_Z;
else if (strcmp(id, "m") == 0 || strcmp(id, "x") == 0)
idx = PREAMBLE_X;
else if (strcmp(id, "w") == 0 || strcmp(id, "y") == 0)
idx = PREAMBLE_Y;
else {
SNDERR("invalid IEC958 preamble type %s", id);
return -EINVAL;
}
err = snd_config_get_integer(n, &val);
if (err < 0) {
SNDERR("invalid IEC958 preamble value");
return err;
}
preamble_vals[idx] = val;
}
}
if (!slave) {
SNDERR("slave is not defined");
return -EINVAL;
}
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_IEC958_SUBFRAME_LE &&
sformat != SND_PCM_FORMAT_IEC958_SUBFRAME_BE) {
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_iec958_open(pcmp, name, sformat, spcm, 1,
status ? status_bits : NULL,
preamble_vals, hdmi_mode);
if (err < 0)
snd_pcm_close(spcm);
return err;
}
#ifndef DOC_HIDDEN
SND_DLSYM_BUILD_VERSION(_snd_pcm_iec958_open, SND_PCM_DLSYM_VERSION);
#endif