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Support SDL audio devices that require float32 samples.

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Fixes missing audio when playing on Windows with SDL 2.0.7, which started
using WASAPI, which demands floating point audio.
This commit is contained in:
Ryan C. Gordon 2018-04-13 14:05:12 -04:00
parent 3377f9981a
commit 4f8c7c2f2f
5 changed files with 26 additions and 4 deletions
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3
code/client/cl_avi.c
View file

@ -368,6 +368,9 @@ qboolean CL_OpenAVIForWriting( const char *fileName )
afd.a.rate = dma.speed;
afd.a.format = WAV_FORMAT_PCM;
afd.a.channels = dma.channels;
/* !!! FIXME: if CL_WriteAVIAudioFrame() is ever called from somewhere other
!!! FIXME: than S_TransferStereo16(), we will need to handle/convert
!!! FIXME: float32 samples for AVI writing. */
afd.a.bits = dma.samplebits;
afd.a.sampleSize = ( afd.a.bits / 8 ) * afd.a.channels;

2
code/client/snd_dma.c
View file

@ -100,7 +100,7 @@ void S_Base_SoundInfo(void) {
} else {
Com_Printf("%5d stereo\n", dma.channels - 1);
Com_Printf("%5d samples\n", dma.samples);
Com_Printf("%5d samplebits\n", dma.samplebits);
Com_Printf("%5d samplebits (%s)\n", dma.samplebits, dma.isfloat ? "float" : "int");
Com_Printf("%5d submission_chunk\n", dma.submission_chunk);
Com_Printf("%5d speed\n", dma.speed);
Com_Printf("%p dma buffer\n", dma.buffer);

1
code/client/snd_local.h
View file

@ -67,6 +67,7 @@ typedef struct {
int samples; // mono samples in buffer
int submission_chunk; // don't mix less than this #
int samplebits;
int isfloat;
int speed;
byte *buffer;
} dma_t;

17
code/client/snd_mix.c
View file

@ -184,7 +184,22 @@ void S_TransferPaintBuffer(int endtime)
out_idx = s_paintedtime * dma.channels & out_mask;
step = 3 - dma.channels;
if (dma.samplebits == 16)
if ((dma.isfloat) && (dma.samplebits == 32))
{
float *out = (float *) pbuf;
while (count--)
{
val = *p >> 8;
p+= step;
if (val > 0x7fff)
val = 0x7fff;
else if (val < -32767) /* clamp to one less than max to make division max out at -1.0f. */
val = -32767;
out[out_idx] = ((float) val) / 32767.0f;
out_idx = (out_idx + 1) & out_mask;
}
}
else if (dma.samplebits == 16)
{
short *out = (short *) pbuf;
while (count--)

7
code/sdl/sdl_snd.c
View file

@ -96,7 +96,9 @@ static struct
{ AUDIO_U16LSB, "AUDIO_U16LSB" },
{ AUDIO_S16LSB, "AUDIO_S16LSB" },
{ AUDIO_U16MSB, "AUDIO_U16MSB" },
{ AUDIO_S16MSB, "AUDIO_S16MSB" }
{ AUDIO_S16MSB, "AUDIO_S16MSB" },
{ AUDIO_F32LSB, "AUDIO_F32LSB" },
{ AUDIO_F32MSB, "AUDIO_F32MSB" }
};
static int formatToStringTableSize = ARRAY_LEN( formatToStringTable );
@ -228,7 +230,8 @@ qboolean SNDDMA_Init(void)
}
dmapos = 0;
dma.samplebits = obtained.format & 0xFF; // first byte of format is bits.
dma.samplebits = SDL_AUDIO_BITSIZE(obtained.format);
dma.isfloat = SDL_AUDIO_ISFLOAT(obtained.format);
dma.channels = obtained.channels;
dma.samples = tmp;
dma.submission_chunk = 1;