Here is a list of all files with brief descriptions:

[detail level 12345678]

src
include
ipc
channel_map.h
compress_params.h
control.h	IPC control commands
dai-amd.h
dai-imx.h
dai-intel.h	IPC definitions
dai-mediatek.h
dai.h	IPC DAI definitions
debug.h
header-intel-cavs.h	IPC command header for Intel cAVS platforms
header.h	IPC command header
info.h	IPC definitions
pm.h	IPC definitions
probe.h
probe_dma_frame.h
stream.h	IPC definitions for streams
topology.h	IPC definitions
trace.h	IPC definitions
xtensa.h	IPC definitions
kernel
abi.h	ABI definitions
ext_manifest.h
header.h	Non IPC command header
mailbox.h	FW Regs API definition
tokens.h
sof
audio
cadence
aac_dec
xa_aac_dec_api.h
mp3_dec
xa_mp3_dec_api.h
mp3_enc
xa_mp3_enc_api.h
src_pp
xa_src_pp_api.h
vorbis_dec
xa_vorbis_dec_api.h
xa_apicmd_standards.h
xa_error_standards.h
xa_memory_standards.h
xa_type_def.h
coefficients
fft
twiddle_16.h
twiddle_3072_32.h
twiddle_32.h
pdm_decim
pdm_decim_fir.h
pdm_decim_int32_02_4323_5100_010_095.h
pdm_decim_int32_02_4375_5100_010_095.h
pdm_decim_int32_03_4375_5100_010_095.h
pdm_decim_int32_04_4318_5100_010_095.h
pdm_decim_int32_05_4325_5100_010_095.h
pdm_decim_int32_06_4172_5100_010_095.h
pdm_decim_int32_08_4156_5301_010_090.h
pdm_decim_int32_10_4156_5345_010_090.h
pdm_decim_int32_12_4156_5345_010_090.h
pdm_decim_table.h
volume
windows_fade.h
compress_other
pcm_dec
xa_pcm_dec_api.h
igo_nr
igo_lib.h
igo_nr_comp.h
mfcc
mfcc_comp.h
mfcc_vad.h	Voice Activity Detection based on Mel spectrum energy
module_adapter
iadk
utilities
array.h
adsp_stddef.h
api_version.h
fixed_array.h
iadk_module_adapter.h
module_initial_settings.h
module_initial_settings_concrete.h
processing_module_factory_interface.h
processing_module_interface.h
processing_module_prerequisites.h
system_agent.h
system_agent_interface.h
system_error.h
system_service.h
library
native_system_agent.h
native_system_service.h
userspace_proxy.h
userspace_proxy_user.h
module
cadence.h
generic.h
module_interface.h
modules.h
nxp
eap
eap_lib_defines.h
EAP_Parameter_presets.h
rtnr
rtklib
include
RTK_MA_API.h
rtnr.h
smart_amp
smart_amp.h
audio_buffer.h
audio_stream.h	Audio Stream API definition
buffer.h
channel_map.h
component.h	Component API definition
component_ext.h	Component API for Infrastructure
data_blob.h
format.h
format_generic.h
format_hifi3.h
intel_uaol.h
ipc-config.h
kpb.h
mic_privacy_manager.h
pcm_converter.h	PCM converter header file
pipeline-trace.h
pipeline.h
ring_buffer.h
selector.h	Channel selector component header file
sink_api.h
sink_source_utils.h
source_api.h
stream.h
debug
gdb
gdb.h
ringbuffer.h
telemetry
performance_monitor.h
telemetry.h
backtrace.h
debug.h
drivers
acp_dai_dma.h
afe-dai.h
afe-drv.h
afe-memif.h
afe-sgen.h
cache_attr.h
dmic.h
dw-dma.h
edma.h
esai.h
gpio.h
hda-dma.h
hda.h
interrupt-map.h
iomux.h
micfil.h
mu.h
pmc.h
sai.h
sdma.h
spi.h
ssp.h
ipc
common.h
driver.h
ipc_reply.h
msg.h
notification_pool.h
schedule.h
topology.h
lib
agent.h
ams.h
ams_msg.h
cpu-clk-manager.h	CPU clk manager definition
dai-legacy.h
dai-zephyr.h	DAI Drivers definition
fast-get.h
mailbox.h
notifier.h
perf_cnt.h	Simple performance counters
uuid.h
vregion.h
watchdog.h
math
a_law.h
auditory.h
cordic.h
dct.h
decibels.h
exp_fcn.h
fft.h
fir_config.h
fir_generic.h
fir_hifi2ep.h
fir_hifi3.h
icomplex16.h
icomplex32.h
iir_df1.h
iir_df1_generic.h
iir_df1_hifi3.h
iir_df2t.h
iir_df2t_generic.h
iir_df2t_hifi3.h
log.h
lut_trig.h
matrix.h
mu_law.h
numbers.h
power.h
sqrt.h
trig.h
window.h
probe
probe.h
samples
audio
kwd_nn
kwd_nn_config.h
kwd_nn_preprocess.h
kwd_nn_process.h
detect_test.h
kwd_nn_detect_test.h
smart_amp_test.h
schedule
dp_schedule.h
edf_schedule.h
ll_schedule.h
ll_schedule_domain.h
schedule.h
twb_schedule.h
trace
dma-trace.h
trace-boot.h
trace-soflogger.h
trace.h
auth_api_iface.h
boot_test.h
coherent.h
common.h
fw-ready-metadata.h
lib_manager.h
list.h
llext_manager.h
objpool.h
platform.h	Platform API definition
tlv.h
ut.h
user
abi_dbg.h	ABI definitions for debug interfaces accessed by user space apps
audio_feature.h
debug_stream.h
debug_stream_slot.h
debug_stream_text_msg.h
debug_stream_thread_info.h
eq.h
fir.h
igo_nr.h
kpb.h
mfcc.h
rtnr.h
selector.h
smart_amp.h
sound_dose.h
tone.h
trace.h
xtos
include
rtos
bit.h
interrupt.h
string_macro.h
sof
compiler_attributes.h
zephyr
include
rtos
alloc.h
atomic.h
bit.h
cache.h
clk.h
idc.h	IDC header file
init.h
interrupt.h
kernel.h
mutex.h
panic.h
sof.h
spinlock.h
string.h
string_macro.h
symbol.h
task.h
timer.h
userspace_helper.h
wait.h
sof
lib
cpu.h	CPU header file
dai.h
dma-legacy.h
dma.h
io.h
memory.h
mm_heap.h
pm_runtime.h
regions_mm.h
sof_dma.h
vpage.h
trace
preproc.h
trace.h
compiler_attributes.h
compiler_info.h
init.h