coding: implement TCH/F9.6, TCH/[FH]4.8, TCH/H2.4, TCH/F14.4
Implement all CSD specific channel modes, except TCH/F2.4. All of
these modes are more or less similar to each other. The TCH/F2.4
is more similar to TCH/FS and slightly more complicated.
FACCH/F and FACCH/H will be implemented in a follow-up change.
Change-Id: Ib482817b5f6a4e3c7299f6e0b3841143b60fc93d
Related: OS#1572
diff --git a/tests/coding/coding_test.c b/tests/coding/coding_test.c
index 8a0506a..a13dc4c 100644
--- a/tests/coding/coding_test.c
+++ b/tests/coding/coding_test.c
@@ -489,6 +489,92 @@
uint8_t test_speech_efr[31];
uint8_t test_speech_hr[14];
+struct csd_test_case {
+ const char *name;
+ unsigned int num_bits;
+ int (*enc_fn)(ubit_t *out, const ubit_t *in);
+ int (*dec_fn)(ubit_t *out, const sbit_t *in, int *ne, int *nb);
+};
+
+static const struct csd_test_case csd_tests[] = {
+ {
+ .name = "TCH/F9.6",
+ .num_bits = 4 * 60,
+ .enc_fn = &gsm0503_tch_fr96_encode,
+ .dec_fn = &gsm0503_tch_fr96_decode,
+ },
+ {
+ .name = "TCH/F4.8",
+ .num_bits = 2 * 60,
+ .enc_fn = &gsm0503_tch_fr48_encode,
+ .dec_fn = &gsm0503_tch_fr48_decode,
+ },
+ {
+ .name = "TCH/H4.8",
+ .num_bits = 4 * 60,
+ .enc_fn = &gsm0503_tch_hr48_encode,
+ .dec_fn = &gsm0503_tch_hr48_decode,
+ },
+ {
+ .name = "TCH/H2.4",
+ .num_bits = 2 * 72,
+ .enc_fn = &gsm0503_tch_hr24_encode,
+ .dec_fn = &gsm0503_tch_hr24_decode,
+ },
+ {
+ .name = "TCH/F14.4",
+ .num_bits = 290,
+ .enc_fn = &gsm0503_tch_fr144_encode,
+ .dec_fn = &gsm0503_tch_fr144_decode,
+ },
+};
+
+static void test_csd(const struct csd_test_case *tc)
+{
+ const uint8_t patterns[] = { 0x00, 0xaa, 0xff };
+ ubit_t bursts_u[116 * (22 + 8)] = { 0 };
+ sbit_t bursts_s[116 * (22 + 8)] = { 0 };
+ ubit_t data[512];
+ int rc;
+
+ /* Encode three data blocks, each block filled-in with a pattern */
+ for (unsigned int i = 0; i < ARRAY_SIZE(patterns); i++) {
+ for (unsigned int j = 0; j < tc->num_bits; j++)
+ data[j] = (patterns[i] & (1 << (j % 8))) != 0;
+
+ rc = tc->enc_fn(&bursts_u[i * 4 * 116], &data[0]);
+ CHECK_RC_OR_RET(rc == 0, "encoding");
+ }
+
+ /* TODO: test FACCH stealing */
+
+ /* Prepare soft-bits */
+ osmo_ubit2sbit(&bursts_s[0], &bursts_u[0], sizeof(bursts_s));
+
+ /* Decode the soft-bits, print decoded blocks */
+ for (unsigned int i = 0; i < ARRAY_SIZE(patterns); i++) {
+ int n_errors, n_bits_total;
+
+ rc = tc->dec_fn(&data[0], &bursts_s[i * 4 * 116],
+ &n_errors, &n_bits_total);
+ CHECK_RC_OR_RET(rc == tc->num_bits, "decoding");
+
+ printf("%s(%s): block #%u (pattern 0x%02x): n_errors=%d / n_bits_total=%d\n",
+ __func__, tc->name, i, patterns[i], n_errors, n_bits_total);
+
+ for (unsigned int j = 0; j < tc->num_bits; j++) {
+ if (j && j % 64 == 0)
+ printf("\n");
+ else if (j && j % 8 == 0)
+ printf(" ");
+ printf("%c", data[j] ? '1' : '0');
+ }
+ printf("\n");
+ }
+
+ printf("\n");
+}
+
int main(int argc, char **argv)
{
int i, len_l2, len_mb;
@@ -549,6 +635,10 @@
}
}
+ printf("\nTesting CSD functions:\n");
+ for (i = 0; i < ARRAY_SIZE(csd_tests); i++)
+ test_csd(&csd_tests[i]);
+
printf("Success\n");
return 0;