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PCM: Add string conversion helper functions for chmap

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Added a few helper functions between chmap and string.
  snd_pcm_chmap_type_name() -- a string of the given chmap type
  snd_pcm_chmap_name() -- a string of the given channel position
  snd_pcm_chmap_print() -- print channel map on the given buffer
  snd_pcm_chmap_from_string() -- get a channel position from string
  snd_pcm_parse_string() -- parse the whole channel map from string

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2012-09-10 18:07:36 +02:00
parent 6950a1030c
commit b4c64e815a
3 changed files with 160 additions and 57 deletions
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69
test/chmap.c
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@ -21,62 +21,11 @@ static void usage(void)
" -r rate Sample rate\n");
}
static const char * const chname[] = {
"Unknown",
"FL", "FR", "RL", "RR", "FC", "LFE", "SL", "SR", "RC",
"FLC", "FRC", "RLC", "RRC", "FLW", "FRW", "FLH",
"FCH", "FRH", "TC",
"N/A",
};
#define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0]))
static void print_channels(const snd_pcm_chmap_t *map)
{
unsigned int i;
printf(" ");
for (i = 0; i < map->channels; i++) {
unsigned int c = map->pos[i];
unsigned int p = c & SND_CHMAP_POSITION_MASK;
if (c & SND_CHMAP_DRIVER_SPEC)
printf(" %d", p);
else if (p >= ARRAY_SIZE(chname))
printf(" Ch%d", p);
else
printf(" %s", chname[p]);
if (c & SND_CHMAP_PHASE_INVERSE)
printf("[INV]");
}
printf("\n");
}
static int to_channel(const char *name)
{
unsigned int i;
if (isdigit(*name))
return atoi(name);
for (i = 0; i < ARRAY_SIZE(chname); i++)
if (!strcmp(chname[i], name))
return i;
return SND_CHMAP_UNKNOWN;
}
static const char *chmap_type(int type)
{
switch (type) {
case SND_CHMAP_NONE:
return "None";
case SND_CHMAP_FIXED:
return "Fixed";
case SND_CHMAP_VAR:
return "Variable";
case SND_CHMAP_PAIRED:
return "Paired";
default:
return "Unknown";
}
char tmp[128];
if (snd_pcm_chmap_print(map, sizeof(tmp), tmp) > 0)
printf(" %s\n", tmp);
}
static int query_chmaps(snd_pcm_t *pcm)
@ -89,7 +38,9 @@ static int query_chmaps(snd_pcm_t *pcm)
return 1;
}
for (p = maps; (v = *p) != NULL; p++) {
printf("Type = %s, Channels = %d\n", chmap_type(v->type), v->map.channels);
printf("Type = %s, Channels = %d\n",
snd_pcm_chmap_type_name(v->type),
v->map.channels);
print_channels(&v->map);
}
snd_pcm_free_chmaps(maps);
@ -173,8 +124,12 @@ static int set_chmap(snd_pcm_t *pcm, int format, int channels, int rate,
return 1;
}
map->channels = channels;
for (i = 0; i < channels; i++)
map->pos[i] = to_channel(arg[i]);
for (i = 0; i < channels; i++) {
int val = snd_pcm_chmap_from_string(arg[i]);
if (val < 0)
val = SND_CHMAP_UNKNOWN;
map->pos[i] = val;
}
if (snd_pcm_set_chmap(pcm, map) < 0) {
printf("Cannot set chmap\n");
return 1;