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Enhanced bitmasks in PCM - added support for more formats by Takashi and me

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This commit is contained in:
Jaroslav Kysela 2002-06-26 02:04:11 +00:00
parent 84730c976f
commit 16b3bf447c
14 changed files with 893 additions and 162 deletions
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96
src/pcm/pcm_plug.c
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@ -145,6 +145,39 @@ static snd_pcm_format_t linear_preferred_formats[] = {
SND_PCM_FORMAT_S24_LE,
SND_PCM_FORMAT_U24_LE,
#endif
#ifdef SND_LITTLE_ENDIAN
SND_PCM_FORMAT_S24_3LE,
SND_PCM_FORMAT_U24_3LE,
SND_PCM_FORMAT_S24_3BE,
SND_PCM_FORMAT_U24_3BE,
#else
SND_PCM_FORMAT_S24_3BE,
SND_PCM_FORMAT_U24_3BE,
SND_PCM_FORMAT_S24_3LE,
SND_PCM_FORMAT_U24_3LE,
#endif
#ifdef SND_LITTLE_ENDIAN
SND_PCM_FORMAT_S20_3LE,
SND_PCM_FORMAT_U20_3LE,
SND_PCM_FORMAT_S20_3BE,
SND_PCM_FORMAT_U20_3BE,
#else
SND_PCM_FORMAT_S20_3BE,
SND_PCM_FORMAT_U20_3BE,
SND_PCM_FORMAT_S20_3LE,
SND_PCM_FORMAT_U20_3LE,
#endif
#ifdef SND_LITTLE_ENDIAN
SND_PCM_FORMAT_S18_3LE,
SND_PCM_FORMAT_U18_3LE,
SND_PCM_FORMAT_S18_3BE,
SND_PCM_FORMAT_U18_3BE,
#else
SND_PCM_FORMAT_S18_3BE,
SND_PCM_FORMAT_U18_3BE,
SND_PCM_FORMAT_S18_3LE,
SND_PCM_FORMAT_U18_3LE,
#endif
};
static snd_pcm_format_t nonlinear_preferred_formats[] = {
@ -167,9 +200,39 @@ static snd_pcm_format_t float_preferred_formats[] = {
#endif
};
static char linear_format_widths[32] = {
0, 0, 0, 0, 0, 0, 0, 1,
0, 0, 0, 0, 0, 0, 0, 1,
0, 1, 0, 1, 0, 0, 0, 1,
0, 0, 0, 0, 0, 0, 0, 1,
};
static int check_linear_format(const snd_pcm_format_mask_t *format_mask, int wid, int sgn, int ed)
{
int e, s;
if (! linear_format_widths[wid - 1])
return SND_PCM_FORMAT_UNKNOWN;
for (e = 0; e < 2; e++) {
for (s = 0; s < 2; s++) {
int pw = ((wid + 7) / 8) * 8;
for (; pw <= 32; pw += 8) {
snd_pcm_format_t f;
f = snd_pcm_build_linear_format(wid, pw, sgn, ed);
if (f != SND_PCM_FORMAT_UNKNOWN &&
snd_pcm_format_mask_test(format_mask, f))
return f;
}
sgn = !sgn;
}
ed = !ed;
}
return SND_PCM_FORMAT_UNKNOWN;
}
static snd_pcm_format_t snd_pcm_plug_slave_format(snd_pcm_format_t format, const snd_pcm_format_mask_t *format_mask)
{
int w, u, e, wid, w1, dw;
int w, w1, u, e;
snd_pcm_format_t f;
snd_pcm_format_mask_t lin = { SND_PCM_FMTBIT_LINEAR };
snd_pcm_format_mask_t fl = { SND_PCM_FMTBIT_FLOAT };
if (snd_pcm_format_mask_test(format_mask, format))
@ -228,28 +291,15 @@ static snd_pcm_format_t snd_pcm_plug_slave_format(snd_pcm_format_t format, const
u = snd_pcm_format_unsigned(format);
e = snd_pcm_format_big_endian(format);
}
w1 = w;
dw = 8;
for (wid = 0; wid < 4; ++wid) {
int end, e1 = e;
for (end = 0; end < 2; ++end) {
int sgn, u1 = u;
for (sgn = 0; sgn < 2; ++sgn) {
snd_pcm_format_t f;
f = snd_pcm_build_linear_format(w1, u1, e1);
assert(f != SND_PCM_FORMAT_UNKNOWN);
if (snd_pcm_format_mask_test(format_mask, f))
return f;
u1 = !u1;
}
e1 = !e1;
}
if (w1 < 32)
w1 += dw;
else {
w1 = w - 8;
dw = -8;
}
for (w1 = w; w1 <= 32; w1++) {
f = check_linear_format(format_mask, w1, u, e);
if (f != SND_PCM_FORMAT_UNKNOWN)
return f;
}
for (w1 = w - 1; w1 > 0; w1--) {
f = check_linear_format(format_mask, w1, u, e);
if (f != SND_PCM_FORMAT_UNKNOWN)
return f;
}
return SND_PCM_FORMAT_UNKNOWN;
}