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comparison libgsmfr2/full_dec_wrap.c @ 528:f681fb758041

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libgsmfr2: add gsmfr_fulldec_rtp_in()
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 19 Sep 2024 07:52:17 +0000
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527:f3246d109e2d 528:f681fb758041
1 /*
2 * This module implements a wrapper around the main processing functions
3 * of our full decoder, handling RTP input per TW-TS-001.
4 */
5
6 #include <stdint.h>
7 #include "tw_gsmfr.h"
8
9 int gsmfr_fulldec_rtp_in(struct gsmfr_fulldec_state *st, const uint8_t *rtp_pl,
10 unsigned rtp_pl_len, int16_t *pcm)
11 {
12 switch (rtp_pl_len) {
13 case 0:
14 /* BFI-no-data, but not an invalid RTP input per se */
15 gsmfr_fulldec_bfi(st, 0, pcm);
16 return 0;
17 case 1:
18 if ((rtp_pl[0] & 0xF6) != 0xE6)
19 goto bad_rtp_input;
20 /* TW-TS-001 No_Data frame */
21 gsmfr_fulldec_bfi(st, rtp_pl[0] & 1, pcm);
22 return 0;
23 case GSMFR_RTP_FRAME_LEN:
24 if ((rtp_pl[0] & 0xF0) != 0xD0)
25 goto bad_rtp_input;
26 /* basic RTP format */
27 gsmfr_fulldec_good_frame(st, rtp_pl, pcm);
28 return 0;
29 case GSMFR_RTP_FRAME_LEN+1:
30 if ((rtp_pl[0] & 0xF4) != 0xE0)
31 goto bad_rtp_input;
32 if ((rtp_pl[1] & 0xF0) != 0xD0)
33 goto bad_rtp_input;
34 /* extended RTP format (TW-TS-001) */
35 if (rtp_pl[0] & 0x02)
36 gsmfr_fulldec_bfi_bits(st, rtp_pl + 1, rtp_pl[0] & 1,
37 pcm);
38 else
39 gsmfr_fulldec_good_frame(st, rtp_pl + 1, pcm);
40 return 0;
41 default:
42 bad_rtp_input:
43 /*
44 * Treat it like BFI-no-data, and tell the caller
45 * that we received an invalid RTP payload.
46 */
47 gsmfr_fulldec_bfi(st, 0, pcm);
48 return -1;
49 }
50 }