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Release 4.13 sound/core/pcm_iec958.c

Directory: sound/core
/*
 *  PCM DRM helpers
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License version 2 as
 *   published by the Free Software Foundation.
 */
#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>


static int create_iec958_consumer(uint rate, uint sample_width, u8 *cs, size_t len) { unsigned int fs, ws; if (len < 4) return -EINVAL; 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; } if (len > 4) { 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; } } 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 | fs; if (len > 4) cs[4] = ws; return len; }

Contributors

PersonTokensPropCommitsCommitProp
Russell King20894.55%133.33%
Jyri Sarha125.45%266.67%
Total220100.00%3100.00%

/** * 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) { return create_iec958_consumer(runtime->rate, snd_pcm_format_width(runtime->format), cs, len); }

Contributors

PersonTokensPropCommitsCommitProp
Jyri Sarha36100.00%1100.00%
Total36100.00%1100.00%

EXPORT_SYMBOL(snd_pcm_create_iec958_consumer); /** * snd_pcm_create_iec958_consumer_hw_params - create IEC958 channel status * @hw_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) { return create_iec958_consumer(params_rate(params), params_width(params), cs, len); }

Contributors

PersonTokensPropCommitsCommitProp
Jyri Sarha35100.00%1100.00%
Total35100.00%1100.00%

EXPORT_SYMBOL(snd_pcm_create_iec958_consumer_hw_params);

Overall Contributors

PersonTokensPropCommitsCommitProp
Russell King22870.81%133.33%
Jyri Sarha9429.19%266.67%
Total322100.00%3100.00%
Directory: sound/core
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