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audio: add float sample endianness converters

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Commit ed2a4a7941 ("audio: proper support for float samples in
mixeng") added support for float audio samples. As there were no
audio frontend devices with float support at that time, the code
was limited to native endian float samples.

When nobody was paying attention, an audio device that supports
floating point samples crept in with commit eb9ad377bb
("virtio-sound: handle control messages and streams").

Add code for the audio subsystem to convert float samples to the
correct endianness.

The type punning code was taken from the PipeWire project.

Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Volker Rümelin <vr_qemu@t-online.de>
Message-Id: <20250515054429.7385-7-vr_qemu@t-online.de>
This commit is contained in:
Volker Rümelin 2025-05-15 07:44:29 +02:00 • committed by Marc-André Lureau
parent 9ddb7c85c9
commit 5d978c5da7
4 changed files with 82 additions and 14 deletions
Download patch file Download diff file Expand all files Collapse all files

3
audio/audio.c
View file

@ -1892,7 +1892,8 @@ CaptureVoiceOut *AUD_add_capture(
cap->buf = g_malloc0_n(hw->mix_buf.size, hw->info.bytes_per_frame);
if (hw->info.is_float) {
hw->clip = mixeng_clip_float[hw->info.nchannels == 2];
hw->clip = mixeng_clip_float[hw->info.nchannels == 2]
[hw->info.swap_endianness];
} else {
hw->clip = mixeng_clip
[hw->info.nchannels == 2]

12
audio/audio_template.h
View file

@ -174,9 +174,11 @@ static int glue (audio_pcm_sw_init_, TYPE) (
if (sw->info.is_float) {
#ifdef DAC
sw->conv = mixeng_conv_float[sw->info.nchannels == 2];
sw->conv = mixeng_conv_float[sw->info.nchannels == 2]
[sw->info.swap_endianness];
#else
sw->clip = mixeng_clip_float[sw->info.nchannels == 2];
sw->clip = mixeng_clip_float[sw->info.nchannels == 2]
[sw->info.swap_endianness];
#endif
} else {
#ifdef DAC
@ -303,9 +305,11 @@ static HW *glue(audio_pcm_hw_add_new_, TYPE)(AudioState *s,
if (hw->info.is_float) {
#ifdef DAC
hw->clip = mixeng_clip_float[hw->info.nchannels == 2];
hw->clip = mixeng_clip_float[hw->info.nchannels == 2]
[hw->info.swap_endianness];
#else
hw->conv = mixeng_conv_float[hw->info.nchannels == 2];
hw->conv = mixeng_conv_float[hw->info.nchannels == 2]
[hw->info.swap_endianness];
#endif
} else {
#ifdef DAC

75
audio/mixeng.c
View file

@ -283,6 +283,11 @@ static const float float_scale_reciprocal = 1.f / ((int64_t)INT32_MAX + 1);
#endif
#endif
#define F32_TO_F32S(v) \
bswap32((union { uint32_t i; float f; }){ .f = (v) }.i)
#define F32S_TO_F32(v) \
((union { uint32_t i; float f; }){ .i = bswap32(v) }.f)
static void conv_natural_float_to_mono(struct st_sample *dst, const void *src,
int samples)
{
@ -294,6 +299,17 @@ static void conv_natural_float_to_mono(struct st_sample *dst, const void *src,
}
}
static void conv_swap_float_to_mono(struct st_sample *dst, const void *src,
int samples)
{
const uint32_t *in_f32s = src;
while (samples--) {
dst->r = dst->l = CONV_NATURAL_FLOAT(F32S_TO_F32(*in_f32s++));
dst++;
}
}
static void conv_natural_float_to_stereo(struct st_sample *dst, const void *src,
int samples)
{
@ -306,9 +322,27 @@ static void conv_natural_float_to_stereo(struct st_sample *dst, const void *src,
}
}
t_sample *mixeng_conv_float[2] = {
conv_natural_float_to_mono,
conv_natural_float_to_stereo,
static void conv_swap_float_to_stereo(struct st_sample *dst, const void *src,
int samples)
{
const uint32_t *in_f32s = src;
while (samples--) {
dst->l = CONV_NATURAL_FLOAT(F32S_TO_F32(*in_f32s++));
dst->r = CONV_NATURAL_FLOAT(F32S_TO_F32(*in_f32s++));
dst++;
}
}
t_sample *mixeng_conv_float[2][2] = {
{
conv_natural_float_to_mono,
conv_swap_float_to_mono,
},
{
conv_natural_float_to_stereo,
conv_swap_float_to_stereo,
}
};
static void clip_natural_float_from_mono(void *dst, const struct st_sample *src,
@ -322,6 +356,17 @@ static void clip_natural_float_from_mono(void *dst, const struct st_sample *src,
}
}
static void clip_swap_float_from_mono(void *dst, const struct st_sample *src,
int samples)
{
uint32_t *out_f32s = dst;
while (samples--) {
*out_f32s++ = F32_TO_F32S(CLIP_NATURAL_FLOAT(src->l + src->r));
src++;
}
}
static void clip_natural_float_from_stereo(
void *dst, const struct st_sample *src, int samples)
{
@ -334,9 +379,27 @@ static void clip_natural_float_from_stereo(
}
}
f_sample *mixeng_clip_float[2] = {
clip_natural_float_from_mono,
clip_natural_float_from_stereo,
static void clip_swap_float_from_stereo(
void *dst, const struct st_sample *src, int samples)
{
uint32_t *out_f32s = dst;
while (samples--) {
*out_f32s++ = F32_TO_F32S(CLIP_NATURAL_FLOAT(src->l));
*out_f32s++ = F32_TO_F32S(CLIP_NATURAL_FLOAT(src->r));
src++;
}
}
f_sample *mixeng_clip_float[2][2] = {
{
clip_natural_float_from_mono,
clip_swap_float_from_mono,
},
{
clip_natural_float_from_stereo,
clip_swap_float_from_stereo,
}
};
void audio_sample_to_uint64(const void *samples, int pos,

6
audio/mixeng.h
View file

@ -42,9 +42,9 @@ typedef void (f_sample) (void *dst, const struct st_sample *src, int samples);
extern t_sample *mixeng_conv[2][2][2][3];
extern f_sample *mixeng_clip[2][2][2][3];
/* indices: [stereo] */
extern t_sample *mixeng_conv_float[2];
extern f_sample *mixeng_clip_float[2];
/* indices: [stereo][swap endianness] */
extern t_sample *mixeng_conv_float[2][2];
extern f_sample *mixeng_clip_float[2][2];
void *st_rate_start (int inrate, int outrate);
void st_rate_flow(void *opaque, st_sample *ibuf, st_sample *obuf,