FreeCalypso > hg > gsm-codec-lib
view libtwamr/ietf_out.c @ 480:332397bc80aa
doc/AMR-library-API: document public const data items
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sun, 19 May 2024 23:18:17 +0000 |
parents | ebe499058c63 |
children |
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/* * The function implemented in this module is responsible for turning * struct amr_param_frame (encoder output) into an RFC 4867 payload. */ #include <stdint.h> #include "tw_amr.h" #include "typedef.h" #include "namespace.h" #include "cnst.h" #include "int_defs.h" #include "if1_func.h" static const uint8_t total_bytes_per_ft[9] = {13, 14, 16, 18, 20, 21, 27, 32, 6}; static const uint8_t first_octet_per_ft[9] = {0x04, 0x0C, 0x14, 0x1C, 0x24, 0x2C, 0x34, 0x3C, 0x44}; unsigned amr_frame_to_ietf(const struct amr_param_frame *frame, uint8_t *bytes) { Word16 serial[MAX_SERIAL_SIZE]; Word16 sti; enum Mode ft; switch (frame->type) { case TX_SPEECH_GOOD: ft = frame->mode; break; case TX_SID_FIRST: ft = MRDTX; sti = 0; break; case TX_SID_UPDATE: ft = MRDTX; sti = 1; break; case TX_NO_DATA: default: bytes[0] = 0x7C; return 1; } Prm2bits(ft, frame->param, serial); bytes[0] = first_octet_per_ft[ft]; if1_pack_bytes(ft, serial, bytes + 1); if (ft == MRDTX) { if (sti) bytes[5] |= 0x10; if (frame->mode & 1) bytes[5] |= 0x08; if (frame->mode & 2) bytes[5] |= 0x04; if (frame->mode & 4) bytes[5] |= 0x02; } return total_bytes_per_ft[ft]; }