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#ifndef _OSMO_AMR_H_
#define _OSMO_AMR_H_
/* As defined by RFC3267: Adaptive Multi-Rate (AMR) */
/*
* +----------------+-------------------+----------------
* | payload header | table of contents | speech data ...
* +----------------+-------------------+----------------
*/
/*
* 4.4. Octet-aligned Mode:
*
* 4.4.1. The Payload Header:
*
* 0 1 2 3 4 5 6 7
* +-+-+-+-+-+-+-+-+
* | CMR |X X X X|
* +-+-+-+-+-+-+-+-+
*
* According to: 3GPP TS 26.201 "AMR Wideband speech codec; Frame Structure",
* version 5.0.0 (2001-03), 3rd Generation Partnership Project (3GPP):
*
* Possible Frame type / CMR values:
*
* 0-8 for AMR-WB (from 6.60 kbit/s to 23.85 kbit/s)
* 9 (SID) confort noise.
* 10-13 future use.
* 14 means lost speech frame (only available for AMR-WB)
* 15 means no data
*
* 4.4.2. The table of contents:
*
* 0 1 2 3 4 5 6 7
* +-+-+-+-+-+-+-+-+
* |F| FT |Q|X X|
* +-+-+-+-+-+-+-+-+
*
* X means padding.
*/
struct amr_hdr {
#if __BYTE_ORDER == __BIG_ENDIAN
/* Payload Header */
uint8_t cmr:4, /* Codec Mode Request */
pad1:4;
/* Table of Contents */
uint8_t f:1, /* followed by another speech frame? */
ft:4, /* coding mode */
q:1, /* OK (not damaged) at origin? */
pad2:2;
#elif __BYTE_ORDER == __LITTLE_ENDIAN
/* Payload Header */
uint8_t pad1:4,
cmr:4;
/* Table of Contents */
uint8_t pad2:2,
q:1,
ft:4,
f:1;
#endif
};
static inline void *osmo_amr_get_payload(struct amr_hdr *amrh)
{
return (uint8_t *)amrh + sizeof(struct amr_hdr);
}
#define AMR_FT_0 0 /* 4.75 */
#define AMR_FT_1 1 /* 5.15 */
#define AMR_FT_2 2 /* 5.90 */
#define AMR_FT_3 3 /* 6.70 */
#define AMR_FT_4 4 /* 7.40 */
#define AMR_FT_5 5 /* 7.95 */
#define AMR_FT_6 6 /* 10.2 */
#define AMR_FT_7 7 /* 12.2 */
#define AMR_FT_SID 8 /* SID */
#define AMR_FT_MAX 9
int osmo_amr_ft_valid(uint8_t amr_ft);
size_t osmo_amr_bytes(uint8_t amr_cmr);
#endif
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