[advancemame-users] Sound Issue after upgrading AdvanceMame

[Tim Reagant]

I am migrating my arcade cabinet from AdvanceMame v0.78.1 to v1.4.

Everything is working except the sound on Pac-Man and Galaga. They used
to work fine on v0.78.1.

When I run them with v1.4, the sound is out of sync and distorted. It
makes a stuttering, ticking sound. If I change the mode from the video
menu and reset the game, the sound will work. So I am not sure, but I
suspect it may involve a timing issue with the 224x288 modeline. I am
using the same modelines I used under v0.78.1. I use display_adjust
xclock if that makes a difference.

Anyone run into this before and know what I could do so I can run the
games at their native resolution with sound working?

[Tim Reagant]

Some further information.

Log file indicates a possible sound buffer underflow:

Warning message comes from advance/osd/video.c in function osd2_frame:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
if (context->config.internalresample_flag) {
sample_recount = sample_count - latency_diff;

/* lower limit of number of samples */
sample_limit = sample_count / 32;
if (sample_limit < 16)
sample_limit = 16;

/* correction for a generic sound buffer underflow. */
/* generally happen that the DMA buffer underflow, */
/* reporting a fill state instead of an empty one. */
if (sample_recount < sample_limit) {
--> log_std(("WARNING:emu:video: too small sound samples %d
adjusted to %d\n", sample_recount, sample_limit));
sample_recount = sample_limit;
}

/* ask always at the core to use the nominal sample rate */
latency_diff = 0;
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Warnings from the log file:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
sound:vsync: soundb_vsync_volume(volume:0)
sound:vsync: w_set_master_volume(0)
WARNING:emu:video: too small sound samples -115 adjusted to 24
WARNING:emu:video: too small sound samples -115 adjusted to 24
WARNING:emu:video: too small sound samples -115 adjusted to 24
WARNING:emu:video: too small sound samples -115 adjusted to 24
WARNING:emu:video: too small sound samples -115 adjusted to 24
WARNING:emu:video: too small sound samples -209 adjusted to 24
WARNING:emu:video: too small sound samples -209 adjusted to 24
WARNING:emu:video: too small sound samples -209 adjusted to 24
WARNING:emu:video: too small sound samples -209 adjusted to 24
WARNING:emu:video: too small sound samples -209 adjusted to 24
WARNING:emu:video: too small sound samples -212 adjusted to 24
WARNING:emu:video: too small sound samples -212 adjusted to 24
WARNING:emu:video: too small sound samples -212 adjusted to 24
WARNING:emu:video: too small sound samples -212 adjusted to 24

etc, etc.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Sound system init section from the log file:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
osd: osd_start_audio_stream(sample_rate:44100, stereo_flag:1)
osd: osd2_sound_init(sample_rate:44100, stereo_flag:1)
sound:vsync: soundb_vsync_init(id:3, rate:44100, stereo:1, buffer_time:0.3)
sound:vsync: w_sound_device_init(3, 44100)
wss:error VIA686: no compatble device found.
Intel_ICH: Intel ICH4 integrated AC97 audio found.
Intel_ICH: PCI BASE0 at I/O B800
Intel_ICH: PCI BASE1 at I/O B400
sound:vsync: rate 48000
sound:vsync: device Intel ICH4 integrated AC97 audio
sound: select driver vsync
emu:sound: dft sample 1024, size 1024
sound:vsync: soundb_vsync_start(silence_time:0.05)
sound:vsync: soundb_vsync_volume(volume:1)
sound:vsync: w_set_master_volume(255)
osd: osd_start_audio_stream return 48000 rate
glue: sound samples for frame 792
Namco: freq fractional bits = 16: internal freq = 192000, output freq =
192000
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~