Here is a list of all documented files with brief descriptions:

spandsp-sim
spandsp
g1050.h
line_model.h
line_models.h
rfc2198_sim.h
test_utils.h
spandsp-sim.h
test_utils.c
src
msvc
sys
time.h
config.h
inttypes.h
spandsp.h
tgmath.h
unistd.h
spandsp
private
ademco_contactid.h
adsi.h
agc_float.h
async.h
at_interpreter.h
awgn.h
bell_r2_mf.h
bert.h
bitstream.h
data_modems.h
dtmf.h
echo.h
fax.h
fax_modems.h
fsk.h
g711.h
g722.h
g726.h
godard.h
gsm0610.h
hdlc.h
ima_adpcm.h
image_translate.h
logging.h
lpc10.h
modem_connect_tones.h
modem_echo.h
noise.h
oki_adpcm.h
playout.h
plc.h
power_meter.h
queue.h
schedule.h
sig_tone.h
silence_gen.h
sprt.h
ssl_fax.h
super_tone_rx.h
super_tone_tx.h
swept_tone.h
t30.h
t30_dis_dtc_dcs_bits.h
t31.h
t38_core.h
t38_gateway.h
t38_non_ecm_buffer.h
t38_terminal.h
t42.h
t43.h
t4_rx.h
t4_t6_decode.h
t4_t6_encode.h
t4_tx.h
t81_t82_arith_coding.h
t85.h
time_scale.h
timezone.h
tone_detect.h
tone_generate.h
v150_1.h
v150_1_sse.h
v17rx.h
v17tx.h
v18.h
v22bis.h
v27ter_rx.h
v27ter_tx.h
v29rx.h
v29tx.h
v32bis.h
v34.h
v42.h
v42bis.h
v8.h
v80.h
ademco_contactid.h
adsi.h
agc_float.h
alloc.h
arctan2.h
async.h
at_interpreter.h
awgn.h
bell_r2_mf.h
bert.h
biquad.h
bit_operations.h
bitstream.h
complex.h
complex_filters.h
complex_vector_float.h
complex_vector_int.h
crc.h
data_modems.h
dc_restore.h
dds.h
dtmf.h
echo.h
expose.h
fast_convert.h
fax.h
fax_modems.h
fir.h
fsk.h
g168models.h
g711.h
g722.h
g726.h
godard.h
gsm0610.h
hdlc.h
ima_adpcm.h
image_translate.h
logging.h
lpc10.h
math_fixed.h
modem_connect_tones.h
modem_echo.h
noise.h
oki_adpcm.h
playout.h
plc.h
power_meter.h
queue.h
saturated.h
schedule.h
sig_tone.h
silence_gen.h
sprt.h
ssl_fax.h
stdbool.h
super_tone_rx.h
super_tone_tx.h
swept_tone.h
t30.h
t30_api.h
t30_fcf.h
t30_logging.h
t31.h
t35.h
t38_core.h
t38_gateway.h
t38_non_ecm_buffer.h
t38_terminal.h
t42.h
t43.h
t4_rx.h
t4_t6_decode.h
t4_t6_encode.h
t4_tx.h
t81_t82_arith_coding.h
t85.h
telephony.h
time_scale.h
timezone.h
timing.h
tone_detect.h
tone_generate.h
unaligned.h
v150_1.h
v150_1_sse.h
v17rx.h
v17tx.h
v18.h
v22bis.h
v27ter_rx.h
v27ter_tx.h
v29rx.h
v29tx.h
v32bis.h
v34.h
v42.h
v42bis.h
v8.h
v80.h
vector_float.h
vector_int.h
version.h
ademco_contactid.c
adsi.c
agc_float.c
alloc.c
async.c
at_interpreter.c
at_interpreter_dictionary.h
awgn.c
bell_r2_mf.c
bit_operations.c
bitstream.c
cielab_luts.h
complex_vector_float.c
complex_vector_int.c
config.h
crc.c
data_modems.c
dds_float.c
dds_int.c
dtmf.c
echo.c
fax.c
fax_modems.c
faxfont.h
filter_tools.h
floating_fudge.h
fsk.c
g711.c
g722.c
g726.c
godard.c
gsm0610_decode.c
gsm0610_encode.c
gsm0610_local.h
gsm0610_long_term.c
gsm0610_lpc.c
gsm0610_preprocess.c
gsm0610_rpe.c
gsm0610_short_term.c
hdlc.c
ima_adpcm.c
image_translate.c
logging.c
lpc10_encdecs.h
make_cielab_luts.c
math_fixed.c
math_fixed_tables.h
mmx_sse_decs.h
modem_connect_tones.c
modem_echo.c
noise.c
oki_adpcm.c
plc.c
power_meter.c
queue.c
sig_tone.c
silence_gen.c
spandsp.h
ssl_fax.c
super_tone_rx.c
super_tone_tx.c
swept_tone.c
t30.c
t30_api.c
t30_local.h
t30_logging.c
t31.c
t35.c
t38_core.c
t38_gateway.c
t38_non_ecm_buffer.c
t38_terminal.c
t42.c
t42_t43_local.h
t43.c
t43_gray_code_tables.h
t4_rx.c
t4_t6_decode.c
t4_t6_decode_states.h
t4_t6_encode.c
t4_tx.c
t81_t82_arith_coding.c
t85_decode.c
t85_encode.c
testcpuid.c
time_scale.c
timezone.c
tone_detect.c
tone_generate.c
v150_1_local.h
v17_v32bis_rx_constellation_maps.h
v17_v32bis_rx_godard.h
v17_v32bis_rx_rrc.h
v17_v32bis_tx_constellation_maps.h
v17_v32bis_tx_rrc.h
v17rx.c
v17tx.c
v18.c
v22bis_rx.c
v22bis_rx_1200_rrc.h
v22bis_rx_2400_rrc.h
v22bis_tx.c
v22bis_tx_rrc.h
v27ter_rx.c
v27ter_rx_2400_rrc.h
v27ter_rx_4800_rrc.h
v27ter_tx.c
v27ter_tx_2400_rrc.h
v27ter_tx_4800_rrc.h
v29rx.c
v29rx_godard.h
v29rx_rrc.h
v29tx.c
v29tx_constellation_maps.h
v29tx_rrc.h
v32bis.c
v34_convolutional_coders.h
v34_local.h
v34_logging.c
v34_probe_signals.h
v34_shell_map.h
v34_superconstellation_map.h
v34_tables.h
v34_tx_pre_emphasis_filters.h
v34rx.c
v34tx.c
v42.c
v42bis.c
v8.c
v80.c
vector_float.c
vector_int.c
test-data
etsi
fax
generate_etsi_300_242_pages.c
itu
fax
generate_dithered_tif.c
generate_sized_pages.c
generate_striped_pages.c
tests
alloc_tests.c
async_tests.c
at_interpreter_tests.c
bell_mf_rx_tests.c
bell_mf_tx_tests.c
bert_tests.c
crc_tests.c
data_modems_tests.c
dds_tests.c
dtmf_tx_tests.c
dummy_modems_tests.c
echo_monitor.h
fax_tester.c
fax_tester.h
fax_tests.c
fax_utils.h
g722_tests.c
g726_tests.c
gsm0610_tests.c
hdlc_tests.c
ima_adpcm_tests.c
image_translate_tests.c
line_model_monitor.h
lpc10_tests.c
math_fixed_tests.c
media_monitor.h
modem_monitor.h
oki_adpcm_tests.c
pcap_parse.h
pseudo_terminals.h
r2_mf_rx_tests.c
r2_mf_tx_tests.c
sig_tone_tests.c
socket_dgram_harness.h
socket_harness.h
sprt_decode.c
sprt_tests.c
super_tone_rx_tests.c
super_tone_tx_tests.c
swept_tone_tests.c
t31_tests.c
t35_tests.c
t38_core_tests.c
t38_decode.c
t38_non_ecm_buffer_tests.c
t42_tests.c
t43_tests.c
t4_t6_tests.c
t4_tests.c
t81_t82_arith_coding_tests.c
t85_tests.c
tsb85_tests.c
udptl.h
v150_1_sse_tests.c
v150_1_tests.c
tools
ae.h
meteor-engine.c
meteor-engine.h
meteor.c