The hardware can deal with primes up to 7 and power-of-two multiples thereof; the limitation is reflected by the possible buffer sizes.
Note that setting the voice mask will not allow more than 16 channels even on Sound Blaster Audigy anymore, as 32 seems a bit excessive (the code overall appears to think so, just not in this case).
Signed-off-by: Oswald Buddenhagen oswald.buddenhagen@gmx.de --- sound/pci/emu10k1/emupcm.c | 27 +++++++++++++++++++-------- 1 file changed, 19 insertions(+), 8 deletions(-)
diff --git a/sound/pci/emu10k1/emupcm.c b/sound/pci/emu10k1/emupcm.c index fd3fc96c08e9..ac10b53525fd 100644 --- a/sound/pci/emu10k1/emupcm.c +++ b/sound/pci/emu10k1/emupcm.c @@ -122,6 +122,17 @@ static int snd_emu10k1_pcm_channel_alloc(struct snd_emu10k1_pcm *epcm, return 0; }
+// Primes 2-7 and 2^n multiples thereof, up to 16. +static const unsigned int efx_capture_channels[] = { + 1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 16 +}; + +static const struct snd_pcm_hw_constraint_list hw_constraints_efx_capture_channels = { + .count = ARRAY_SIZE(efx_capture_channels), + .list = efx_capture_channels, + .mask = 0 +}; + static const unsigned int capture_buffer_sizes[31] = { 384, 448, 512, 640, 384*2, 448*2, 512*2, 640*2, @@ -1216,7 +1227,7 @@ static int snd_emu10k1_capture_efx_open(struct snd_pcm_substream *substream) struct snd_emu10k1_pcm *epcm; struct snd_pcm_runtime *runtime = substream->runtime; int nefx = emu->audigy ? 64 : 32; - int idx; + int idx, err;
epcm = kzalloc(sizeof(*epcm), GFP_KERNEL); if (epcm == NULL) @@ -1302,6 +1313,12 @@ static int snd_emu10k1_capture_efx_open(struct snd_pcm_substream *substream) epcm->capture_cr_val = emu->efx_voices_mask[0]; epcm->capture_cr_val2 = emu->efx_voices_mask[1]; spin_unlock_irq(&emu->reg_lock); + err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, + &hw_constraints_efx_capture_channels); + if (err < 0) { + kfree(epcm); + return err; + } snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, &hw_constraints_capture_buffer_sizes); emu->capture_efx_interrupt = snd_emu10k1_pcm_efx_interrupt; @@ -1466,22 +1483,16 @@ static int snd_emu10k1_pcm_efx_voices_mask_put(struct snd_kcontrol *kcontrol, st struct snd_emu10k1 *emu = snd_kcontrol_chip(kcontrol); unsigned int nval[2], bits; int nefx = emu->audigy ? 64 : 32; - int nefxb = emu->audigy ? 7 : 6; int change, idx; nval[0] = nval[1] = 0; for (idx = 0, bits = 0; idx < nefx; idx++) if (ucontrol->value.integer.value[idx]) { nval[idx / 32] |= 1 << (idx % 32); bits++; }
- // Check that the number of requested channels is a power of two - // not bigger than the number of available channels. - for (idx = 0; idx < nefxb; idx++) - if (1 << idx == bits) - break; - if (idx >= nefxb) + if (bits == 9 || bits == 11 || bits == 13 || bits == 15 || bits > 16) return -EINVAL;
spin_lock_irq(&emu->reg_lock);