FreeCalypso > hg > gsm-codec-lib
changeset 512:4f0ab833bec0
libgsmhr1: add parameter validation function
| author | Mychaela Falconia <falcon@freecalypso.org> |
|---|---|
| date | Sun, 25 Aug 2024 18:42:27 +0000 |
| parents | a5d61331b675 |
| children | 03a40ac2e931 |
| files | libgsmhr1/Makefile libgsmhr1/paramval_common.c libgsmhr1/tw_gsmhr.h |
| diffstat | 3 files changed, 98 insertions(+), 2 deletions(-) [+] |
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--- a/libgsmhr1/Makefile Sun Aug 25 02:50:43 2024 +0000 +++ b/libgsmhr1/Makefile Sun Aug 25 18:42:27 2024 +0000 @@ -1,6 +1,6 @@ OBJS= dhf_packed.o dhf_params.o enc_out_order.o mathdp31.o mathhalf.o \ - pack_frame.o rtp_in.o rtp_in_direct.o sid_detect.o sid_reset.o sp_rom.o\ - twts002_in.o twts002_out.o unpack_frame.o + pack_frame.o paramval_common.o rtp_in.o rtp_in_direct.o sid_detect.o \ + sid_reset.o sp_rom.o twts002_in.o twts002_out.o unpack_frame.o HDRS= enc_out_order.h mathdp31.h mathhalf.h namespace.h sp_rom.h tw_gsmhr.h \ typedefs.h LIB= libgsmhr1.a
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/libgsmhr1/paramval_common.c Sun Aug 25 18:42:27 2024 +0000 @@ -0,0 +1,90 @@ +/* + * The function implemented in this module examines an array of 18 codec + * parameters in the int16_t representation used in this library, and checks + * if the unused upper bits of each int16_t word are cleared as they should be. + * This function, or higher-level wrappers around it, should be used when + * reading from ETSI-format *.cod and *.dec files, to guard against reading + * garbage or wrong endian. + */ + +#include <stdint.h> +#include "tw_gsmhr.h" + +int gsmhr_check_common_params(const int16_t *params) +{ + /* common parameters for all modes */ + if (params[0] & 0xFFE0) + return -1; + if (params[1] & 0xF800) + return -1; + if (params[2] & 0xFE00) + return -1; + if (params[3] & 0xFF00) + return -1; + if (params[4] & 0xFFFE) + return -1; + if (params[5] & 0xFFFC) + return -1; + if (params[5]) { + /* voiced modes */ + /* subframe 1 */ + if (params[6] & 0xFF00) + return -1; + if (params[7] & 0xFE00) + return -1; + if (params[8] & 0xFFE0) + return -1; + /* subframe 2 */ + if (params[9] & 0xFFF0) + return -1; + if (params[10] & 0xFE00) + return -1; + if (params[11] & 0xFFE0) + return -1; + /* subframe 3 */ + if (params[12] & 0xFFF0) + return -1; + if (params[13] & 0xFE00) + return -1; + if (params[14] & 0xFFE0) + return -1; + /* subframe 4 */ + if (params[15] & 0xFFF0) + return -1; + if (params[16] & 0xFE00) + return -1; + if (params[17] & 0xFFE0) + return -1; + } else { + /* unvoiced mode */ + /* subframe 1 */ + if (params[6] & 0xFF80) + return -1; + if (params[7] & 0xFF80) + return -1; + if (params[8] & 0xFFE0) + return -1; + /* subframe 2 */ + if (params[9] & 0xFF80) + return -1; + if (params[10] & 0xFF80) + return -1; + if (params[11] & 0xFFE0) + return -1; + /* subframe 3 */ + if (params[12] & 0xFF80) + return -1; + if (params[13] & 0xFF80) + return -1; + if (params[14] & 0xFFE0) + return -1; + /* subframe 4 */ + if (params[15] & 0xFF80) + return -1; + if (params[16] & 0xFF80) + return -1; + if (params[17] & 0xFFE0) + return -1; + } + return 0; +}
--- a/libgsmhr1/tw_gsmhr.h Sun Aug 25 02:50:43 2024 +0000 +++ b/libgsmhr1/tw_gsmhr.h Sun Aug 25 18:42:27 2024 +0000 @@ -51,6 +51,12 @@ int gsmhr_rtp_in_direct(const uint8_t *rtp_in, unsigned rtp_in_len, int16_t *param); +/* reading parameter arrays from files: validation functions */ + +int gsmhr_check_common_params(const int16_t *params); +int gsmhr_check_encoder_params(const int16_t *params); +int gsmhr_check_decoder_params(const int16_t *params); + /* perfect SID detection and regeneration */ int gsmhr_ts101318_is_perfect_sid(const uint8_t *payload);