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- #include <linux/export.h>
- #include <linux/types.h>
- #include <sound/asoundef.h>
- #include <sound/pcm.h>
- #include <sound/pcm_iec958.h>
- int snd_pcm_create_iec958_consumer(struct snd_pcm_runtime *runtime, u8 *cs,
- size_t len)
- {
- unsigned int fs, ws;
- if (len < 4)
- return -EINVAL;
- switch (runtime->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 (snd_pcm_format_width(runtime->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:
- 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;
- }
- EXPORT_SYMBOL(snd_pcm_create_iec958_consumer);
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