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

[detail level 1234]

► 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
async.h
at_interpreter.h
awgn.h
bell_r2_mf.h
bert.h
bitstream.h
dtmf.h
echo.h
fax.h
fax_modems.h
fsk.h
g711.h
g722.h
g726.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
queue.h
schedule.h
sig_tone.h
silence_gen.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
t4_rx.h
t4_t6_decode.h
t4_t6_encode.h
t4_tx.h
time_scale.h
timezone.h
tone_detect.h
tone_generate.h
v17rx.h
v17tx.h
v18.h
v22bis.h
v27ter_rx.h
v27ter_tx.h
v29rx.h
v29tx.h
v42.h
v42bis.h
v8.h
ademco_contactid.h
adsi.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
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
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
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
t4_rx.h
t4_t6_decode.h
t4_t6_encode.h
t4_tx.h
telephony.h
time_scale.h
timezone.h
timing.h
tone_detect.h
tone_generate.h
v17rx.h
v17tx.h
v18.h
v22bis.h
v27ter_rx.h
v27ter_tx.h
v29rx.h
v29tx.h
v42.h
v42bis.h
v8.h
vector_float.h
vector_int.h
version.h
ademco_contactid.c
adsi.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
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
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
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
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
t4_rx.c
t4_t6_decode_states.h
t4_tx.c
testcpuid.c
time_scale.c
timezone.c
tone_detect.c
tone_generate.c
v17_v32bis_rx_constellation_maps.h
v17_v32bis_rx_fixed_rrc.h
v17_v32bis_rx_floating_rrc.h
v17_v32bis_tx_constellation_maps.h
v17_v32bis_tx_fixed_rrc.h
v17_v32bis_tx_floating_rrc.h
v17rx.c
v17tx.c
v18.c
v22bis_rx.c
v22bis_rx_1200_fixed_rrc.h
v22bis_rx_1200_floating_rrc.h
v22bis_rx_2400_fixed_rrc.h
v22bis_rx_2400_floating_rrc.h
v22bis_tx.c
v22bis_tx_fixed_rrc.h
v22bis_tx_floating_rrc.h
v27ter_rx.c
v27ter_rx_2400_fixed_rrc.h
v27ter_rx_2400_floating_rrc.h
v27ter_rx_4800_fixed_rrc.h
v27ter_rx_4800_floating_rrc.h
v27ter_tx.c
v27ter_tx_2400_fixed_rrc.h
v27ter_tx_2400_floating_rrc.h
v27ter_tx_4800_fixed_rrc.h
v27ter_tx_4800_floating_rrc.h
v29rx.c
v29rx_fixed_rrc.h
v29rx_floating_rrc.h
v29tx.c
v29tx_constellation_maps.h
v29tx_fixed_rrc.h
v29tx_floating_rrc.h
v42.c
v42bis.c
v8.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
async_tests.c
at_interpreter_tests.c
bell_mf_rx_tests.c
bell_mf_tx_tests.c
bert_tests.c
crc_tests.c
dds_tests.c
dtmf_tx_tests.c
echo_monitor.h
fax_tester.c
fax_tester.h
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
r2_mf_rx_tests.c
r2_mf_tx_tests.c
sig_tone_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_gateway_tests.c
t38_gateway_to_terminal_tests.c
t38_non_ecm_buffer_tests.c
t38_terminal_tests.c
t38_terminal_to_gateway_tests.c
t4_tests.c
tsb85_tests.c
udptl.h