// SPDX-License-Identifier: GPL-2.0-only
/*
* PCM DRM helpers
*/
#include <linux/export.h>
#include <linux/types.h>
#include <sound/asoundef.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/pcm_iec958.h>
/**
* snd_pcm_create_iec958_consumer_default - create default consumer format IEC958 channel status
* @cs: channel status buffer, at least four bytes
* @len: length of channel status buffer
*
* Create the consumer format channel status data in @cs of maximum size
* @len. When relevant, the configuration-dependant bits will be set as
* unspecified.
*
* Drivers should then call einter snd_pcm_fill_iec958_consumer() or
* snd_pcm_fill_iec958_consumer_hw_params() to replace these unspecified
* bits by their actual values.
*
* Drivers may wish to tweak the contents of the buffer after creation.
*
* Returns: length of buffer, or negative error code if something failed.
*/
int snd_pcm_create_iec958_consumer_default(u8 *cs, size_t len)
{
if (len < 4)
return -EINVAL;
memset(cs, 0, len);
cs[0] = IEC958_AES0_CON_NOT_COPYRIGHT | IEC958_AES0_CON_EMPHASIS_NONE;
cs[1] = IEC958_AES1_CON_GENERAL;
cs[2] = IEC958_AES2_CON_SOURCE_UNSPEC | IEC958_AES2_CON_CHANNEL_UNSPEC;
cs[3] = IEC958_AES3_CON_CLOCK_1000PPM | IEC958_AES3_CON_FS_NOTID;
if (len > 4)
cs[4] = IEC958_AES4_CON_WORDLEN_NOTID;
return len;
}
EXPORT_SYMBOL_GPL(snd_pcm_create_iec958_consumer_default);
static int fill_iec958_consumer(uint rate, uint sample_width,
u8 *cs, size_t len)
{
if (len < 4)
return -EINVAL;
if ((cs[3] & IEC958_AES3_CON_FS) == IEC958_AES3_CON_FS_NOTID) {
unsigned int fs;
switch (rate) {
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;
default:
return -EINVAL;
}
cs[3] &= ~IEC958_AES3_CON_FS;
cs[3] |= fs;
}
if (len > 4 &&
(cs[4] & IEC958_AES4_CON_WORDLEN) == IEC958_AES4_CON_WORDLEN_NOTID) {
unsigned int ws;
switch (sample_width) {
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:
return -EINVAL;
}
cs[4] &= ~IEC958_AES4_CON_WORDLEN;
cs[4] |= ws;
}
return len;
}
/**
* snd_pcm_fill_iec958_consumer - Fill consumer format IEC958 channel status
* @runtime: pcm runtime structure with ->rate filled in
* @cs: channel status buffer, at least four bytes
* @len: length of channel status buffer
*
* Fill the unspecified bits in an IEC958 status bits array using the
* parameters of the PCM runtime @runtime.
*
* Drivers may wish to tweak the contents of the buffer after its been
* filled.
*
* Returns: length of buffer, or negative error code if something failed.
*/
int snd_pcm_fill_iec958_consumer(struct snd_pcm_runtime *runtime,
u8 *cs, size_t len)
{
return fill_iec958_consumer(runtime->rate,
snd_pcm_format_width(runtime->format),
cs, len);
}
EXPORT_SYMBOL_GPL(snd_pcm_fill_iec958_consumer);
/**
* snd_pcm_fill_iec958_consumer_hw_params - Fill consumer format IEC958 channel status
* @params: the hw_params instance for extracting rate and sample format
* @cs: channel status buffer, at least four bytes
* @len: length of channel status buffer
*
* Fill the unspecified bits in an IEC958 status bits array using the
* parameters of the PCM hardware parameters @params.
*
* Drivers may wish to tweak the contents of the buffer after its been
* filled..
*
* Returns: length of buffer, or negative error code if something failed.
*/
int snd_pcm_fill_iec958_consumer_hw_params(struct snd_pcm_hw_params *params,
u8 *cs, size_t len)
{
return fill_iec958_consumer(params_rate(params), params_width(params), cs, len);
}
EXPORT_SYMBOL_GPL(snd_pcm_fill_iec958_consumer_hw_params);
/**
* snd_pcm_create_iec958_consumer - create consumer format IEC958 channel status
* @runtime: pcm runtime structure with ->rate filled in
* @cs: channel status buffer, at least four bytes
* @len: length of channel status buffer
*
* Create the consumer format channel status data in @cs of maximum size
* @len corresponding to the parameters of the PCM runtime @runtime.
*
* Drivers may wish to tweak the contents of the buffer after creation.
*
* Returns: length of buffer, or negative error code if something failed.
*/
int snd_pcm_create_iec958_consumer(struct snd_pcm_runtime *runtime, u8 *cs,
size_t len)
{
int ret;
ret = snd_pcm_create_iec958_consumer_default(cs, len);
if (ret < 0)
return ret;
return snd_pcm_fill_iec958_consumer(runtime, cs, len);
}
EXPORT_SYMBOL(snd_pcm_create_iec958_consumer);
/**
* snd_pcm_create_iec958_consumer_hw_params - create IEC958 channel status
* @params: the hw_params instance for extracting rate and sample format
* @cs: channel status buffer, at least four bytes
* @len: length of channel status buffer
*
* Create the consumer format channel status data in @cs of maximum size
* @len corresponding to the parameters of the PCM runtime @runtime.
*
* Drivers may wish to tweak the contents of the buffer after creation.
*
* Returns: length of buffer, or negative error code if something failed.
*/
int snd_pcm_create_iec958_consumer_hw_params(struct snd_pcm_hw_params *params,
u8 *cs, size_t len)
{
int ret;
ret = snd_pcm_create_iec958_consumer_default(cs, len);
if (ret < 0)
return ret;
return fill_iec958_consumer(params_rate(params), params_width(params), cs, len);
}
EXPORT_SYMBOL(snd_pcm_create_iec958_consumer_hw_params);
Codebase Browser
linux