FreeCalypso > hg > gsm-codec-lib
view libgsmefr/dec_rtp_in.c @ 549:d9f6b3125259
document TW-TS-005 utilities
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sat, 05 Oct 2024 00:58:01 +0000 |
parents | f2d0f2f15d5f |
children |
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/* * This module implements a wrapper around the main processing functions * of our full decoder, handling RTP input per TW-TS-001. */ #include <stdint.h> #include "gsm_efr.h" int EFR_decode_rtp(struct EFR_decoder_state *st, const uint8_t *rtp_pl, unsigned rtp_pl_len, int16_t *pcm) { switch (rtp_pl_len) { case 0: /* BFI-no-data, but not an invalid RTP input per se */ EFR_decode_bfi_nodata(st, 0, pcm); return 0; case 1: if ((rtp_pl[0] & 0xF6) != 0xE6) goto bad_rtp_input; /* TW-TS-001 No_Data frame */ EFR_decode_bfi_nodata(st, rtp_pl[0] & 1, pcm); return 0; case EFR_RTP_FRAME_LEN: if ((rtp_pl[0] & 0xF0) != 0xC0) goto bad_rtp_input; /* basic RTP format */ EFR_decode_frame(st, rtp_pl, 0, 0, pcm); return 0; case EFR_RTP_FRAME_LEN+1: if ((rtp_pl[0] & 0xF4) != 0xE0) goto bad_rtp_input; if ((rtp_pl[1] & 0xF0) != 0xC0) goto bad_rtp_input; /* extended RTP format (TW-TS-001) */ EFR_decode_frame(st, rtp_pl + 1, (rtp_pl[0] & 2) >> 1, rtp_pl[0] & 1, pcm); return 0; default: bad_rtp_input: /* * Treat it like BFI-no-data, and tell the caller * that we received an invalid RTP payload. */ EFR_decode_bfi_nodata(st, 0, pcm); return -1; } }