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Added automatic ttable expansion

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This commit is contained in:
Jaroslav Kysela 2001-08-21 08:59:07 +00:00
parent 79531a4eb0
commit b11ed04ea0
1 changed files with 19 additions and 12 deletions
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31
src/pcm/pcm_plug.c
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@ -235,7 +235,6 @@ static int snd_pcm_plug_change_channels(snd_pcm_t *pcm, snd_pcm_t **new, snd_pcm
snd_pcm_plug_t *plug = pcm->private_data;
unsigned int tt_ssize, tt_cused, tt_sused;
snd_pcm_route_ttable_entry_t *ttable;
enum snd_pcm_plug_route_policy rpolicy;
int err;
assert(snd_pcm_format_linear(slv->format));
if (clt->channels == slv->channels)
@ -243,23 +242,31 @@ static int snd_pcm_plug_change_channels(snd_pcm_t *pcm, snd_pcm_t **new, snd_pcm
if (clt->rate != slv->rate &&
clt->channels > slv->channels)
return 0;
ttable = plug->ttable;
if (ttable) {
tt_ssize = plug->tt_ssize;
tt_cused = plug->tt_cused;
tt_sused = plug->tt_sused;
} else {
unsigned int k;
unsigned int c = 0, s = 0;
int n;
tt_ssize = slv->channels;
tt_cused = clt->channels;
tt_sused = slv->channels;
ttable = alloca(tt_cused * tt_sused * sizeof(*ttable));
if (plug->ttable) { /* expand or shrink table */
unsigned int c = 0, s = 0;
for (c = 0; c < tt_cused; c++) {
for (s = 0; s < tt_sused; s++) {
snd_pcm_route_ttable_entry_t v;
if (c >= plug->tt_cused)
v = 0;
else if (s >= plug->tt_sused)
v = 0;
else
v = plug->ttable[c * plug->tt_ssize + s];
ttable[c * tt_ssize + s] = v;
}
}
} else {
unsigned int k;
unsigned int c = 0, s = 0;
enum snd_pcm_plug_route_policy rpolicy = plug->route_policy;
int n;
for (k = 0; k < tt_cused * tt_sused; ++k)
ttable[k] = 0;
rpolicy = plug->route_policy;
if (rpolicy == PLUG_ROUTE_POLICY_DEFAULT) {
rpolicy = PLUG_ROUTE_POLICY_COPY;
if (pcm->stream == SND_PCM_STREAM_CAPTURE && clt->channels == 1)