diff options
Diffstat (limited to 'sound/firewire/amdtp.h')
| -rw-r--r-- | sound/firewire/amdtp.h | 24 |
1 files changed, 22 insertions, 2 deletions
diff --git a/sound/firewire/amdtp.h b/sound/firewire/amdtp.h index 4823c08196ac..e6e8926275b0 100644 --- a/sound/firewire/amdtp.h +++ b/sound/firewire/amdtp.h @@ -23,7 +23,7 @@ * corresponds to the end of event in the packet. Out of IEC 61883. * @CIP_WRONG_DBS: Only for in-stream. The value of dbs is wrong in in-packets. * The value of data_block_quadlets is used instead of reported value. - * @SKIP_DBC_ZERO_CHECK: Only for in-stream. Packets with zero in dbc is + * @CIP_SKIP_DBC_ZERO_CHECK: Only for in-stream. Packets with zero in dbc is * skipped for detecting discontinuity. * @CIP_SKIP_INIT_DBC_CHECK: Only for in-stream. The value of dbc in first * packet is not continuous from an initial value. @@ -43,7 +43,27 @@ enum cip_flags { }; /** - * enum cip_sfc - a stream's sample rate + * enum cip_sfc - supported Sampling Frequency Codes (SFCs) + * @CIP_SFC_32000: 32,000 data blocks + * @CIP_SFC_44100: 44,100 data blocks + * @CIP_SFC_48000: 48,000 data blocks + * @CIP_SFC_88200: 88,200 data blocks + * @CIP_SFC_96000: 96,000 data blocks + * @CIP_SFC_176400: 176,400 data blocks + * @CIP_SFC_192000: 192,000 data blocks + * @CIP_SFC_COUNT: the number of supported SFCs + * + * These values are used to show nominal Sampling Frequency Code in + * Format Dependent Field (FDF) of AMDTP packet header. In IEC 61883-6:2002, + * this code means the number of events per second. Actually the code + * represents the number of data blocks transferred per second in an AMDTP + * stream. + * + * In IEC 61883-6:2005, some extensions were added to support more types of + * data such as 'One Bit LInear Audio', therefore the meaning of SFC became + * different depending on the types. + * + * Currently our implementation is compatible with IEC 61883-6:2002. */ enum cip_sfc { CIP_SFC_32000 = 0, |