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apu: Add mixbin beep tone for debugging

This commit is contained in:
Jannik Vogel 2019-02-11 20:05:40 +01:00 committed by mborgerson
parent f2901a24d4
commit c5962e0920
1 changed files with 19 additions and 0 deletions
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19
hw/xbox/mcpx_apu.c
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@ -24,6 +24,7 @@
#include "hw/pci/pci.h"
#include "cpu.h"
#include "hw/xbox/dsp/dsp.h"
#include <math.h>
#define NUM_SAMPLES_PER_FRAME 32
#define NUM_MIXBINS 32
@ -187,6 +188,9 @@ static const struct {
# define MCPX_DPRINTF(format, ...) do { } while (0)
#endif
/* More debug functionality */
#define GENERATE_MIXBIN_BEEP 0
typedef struct MCPXAPUState {
PCIDevice dev;
@ -855,6 +859,21 @@ static void se_frame(void *opaque)
}
}
#if GENERATE_MIXBIN_BEEP
/* Inject some audio to the mixbin for debugging.
* Signal is 1500 Hz sine wave, phase shifted by mixbin number. */
for (mixbin = 0; mixbin < NUM_MIXBINS; mixbin++) {
for (sample = 0; sample < NUM_SAMPLES_PER_FRAME; sample++) {
/* Avoid multiple of 1.0 / NUM_SAMPLES_PER_FRAME for phase shift,
* or waves cancel out */
float offset = sample / (float)NUM_SAMPLES_PER_FRAME -
mixbin / (float)(NUM_SAMPLES_PER_FRAME + 1);
float wave = sinf(offset * M_PI * 2.0f);
mixbins[mixbin][sample] += wave * 0x3FFFFF;
}
}
#endif
/* Write VP results to the GP DSP MIXBUF */
for (mixbin = 0; mixbin < NUM_MIXBINS; mixbin++) {
for (sample = 0; sample < NUM_SAMPLES_PER_FRAME; sample++) {