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mii_emu
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speaker: Allow disabling audio, not just muting 

Allow turning off the audio output (ie not initialize it). Also removed
the debug file descriptor global

Signed-off-by: Michel Pollet <buserror@gmail.com>
This commit is contained in:
Michel Pollet 2023-10-28 06:16:56 +01:00
parent cb17359921
commit 2f30c4986c
2 changed files with 17 additions and 12 deletions
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27
src/mii_speaker.c
View File

@ -90,7 +90,8 @@ mii_speaker_init(
s->mii = mii;
s->fsize = MII_SPEAKER_FRAME_SIZE;
#ifdef HAS_ALSA
_alsa_init(s); // this can/will change fsize
if (!s->off)
_alsa_init(s); // this can/will change fsize
#endif
s->vol_multiplier = 0.2;
s->sample = 0x8000;
@ -132,7 +133,8 @@ mii_speaker_click(
(s->mii->cycles - f->start) > (2 * s->fsize * s->clk_per_sample)) {
// printf("Restarting playback\n");
#ifdef HAS_ALSA
snd_pcm_prepare(s->alsa_pcm);
if (s->alsa_pcm)
snd_pcm_prepare(s->alsa_pcm);
#endif
f->start = s->mii->cycles - (s->clk_per_sample * 8);
f->fill = 0;
@ -166,7 +168,6 @@ mii_speaker_click(
f->audio[sample_index] = s->sample * s->vol_multiplier;
}
int g_mii_audio_record_fd = -1;
// Check to see if there's a new frame to send, send it
void
@ -186,15 +187,17 @@ mii_speaker_run(
s->fplay = (s->fplay + 1) % MII_SPEAKER_FRAME_COUNT;
f = &s->frame[s->fplaying];
if (!s->muted) {
#ifdef HAS_ALSA
int pcm;
if (g_mii_audio_record_fd != -1)
write(g_mii_audio_record_fd, f->audio,
if (s->debug_fd != -1)
write(s->debug_fd, f->audio,
f->fill * sizeof(s->frame[0].audio[0]));
if ((pcm = snd_pcm_writei(s->alsa_pcm,
f->audio, f->fill)) == -EPIPE) {
printf("%s Underrun.\n", __func__);
snd_pcm_recover(s->alsa_pcm, pcm, 1);
#ifdef HAS_ALSA
if (s->alsa_pcm) {
int pcm;
if ((pcm = snd_pcm_writei(s->alsa_pcm,
f->audio, f->fill)) == -EPIPE) {
printf("%s Underrun.\n", __func__);
snd_pcm_recover(s->alsa_pcm, pcm, 1);
}
}
#endif
}
@ -223,4 +226,4 @@ mii_speaker_volume(
s->volume = volume;
// printf("audio: speaker volume set to %.3f (%.4f)\n", volume, mul);
}
}

2
src/mii_speaker.h
View File

@ -24,8 +24,10 @@ typedef struct mii_audio_frame_t {
typedef struct mii_speaker_t {
struct mii_t * mii;
int debug_fd; // if > 0, dump audio to this fd
void * alsa_pcm; // alsa pcm handle
bool muted; // if true, don't play anything
bool off; // if true, don't even initialize (alsa)
float volume; // volume, 0.0 to 10.0
float vol_multiplier; // sample multiplier, 0.0 to 1.0
float cpu_speed; // CPU speed in MHz, to calculate clk_per_sample