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tagstruct: Add pa_tagstruct_put/get_direction()

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This will be used for dealing with node directions. Someone might ask
what's the point of adding functions for serializing just one byte;
the point is the validation in pa_tagstruct_get_direction(). It's nice
to be able to assume that the function will return a valid direction,
instead of an arbitrary 8-bit value.
This commit is contained in:
Tanu Kaskinen 2013-07-03 14:09:18 +03:00
parent dd2b54282a
commit 9e598bfec5
2 changed files with 37 additions and 0 deletions
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33
src/pulsecore/tagstruct.c
View file

@ -304,6 +304,15 @@ void pa_tagstruct_put_format_info(pa_tagstruct *t, pa_format_info *f) {
pa_tagstruct_put_proplist(t, f->plist);
}
void pa_tagstruct_put_direction(pa_tagstruct *t, pa_direction_t direction) {
pa_assert(t);
extend(t, 2);
t->data[t->length++] = PA_TAG_DIRECTION;
t->data[t->length++] = (uint8_t) direction;
}
int pa_tagstruct_gets(pa_tagstruct*t, const char **s) {
int error = 0;
size_t n;
@ -677,6 +686,30 @@ fail:
return -1;
}
int pa_tagstruct_get_direction(pa_tagstruct *t, pa_direction_t *direction) {
uint8_t u;
uint8_t mask = PA_DIRECTION_OUTPUT | PA_DIRECTION_INPUT;
pa_assert(t);
pa_assert(direction);
if (t->rindex + 2 > t->length)
return -1;
if (t->data[t->rindex] != PA_TAG_DIRECTION)
return -1;
u = t->data[t->rindex + 1];
if (!(u & mask) || (u & ~mask))
return -1;
*direction = (pa_direction_t) u;
t->rindex += 2;
return 0;
}
void pa_tagstruct_put(pa_tagstruct *t, ...) {
va_list va;
pa_assert(t);

4
src/pulsecore/tagstruct.h
View file

@ -26,6 +26,7 @@
#include <sys/types.h>
#include <sys/time.h>
#include <pulse/def.h>
#include <pulse/sample.h>
#include <pulse/format.h>
#include <pulse/channelmap.h>
@ -60,6 +61,7 @@ enum {
PA_TAG_PROPLIST = 'P',
PA_TAG_VOLUME = 'V',
PA_TAG_FORMAT_INFO = 'f',
PA_TAG_DIRECTION = 'd',
};
pa_tagstruct *pa_tagstruct_new(const uint8_t* data, size_t length);
@ -86,6 +88,7 @@ void pa_tagstruct_put_cvolume(pa_tagstruct *t, const pa_cvolume *cvolume);
void pa_tagstruct_put_proplist(pa_tagstruct *t, pa_proplist *p);
void pa_tagstruct_put_volume(pa_tagstruct *t, pa_volume_t volume);
void pa_tagstruct_put_format_info(pa_tagstruct *t, pa_format_info *f);
void pa_tagstruct_put_direction(pa_tagstruct *t, pa_direction_t direction);
int pa_tagstruct_get(pa_tagstruct *t, ...);
@ -104,5 +107,6 @@ int pa_tagstruct_get_cvolume(pa_tagstruct *t, pa_cvolume *v);
int pa_tagstruct_get_proplist(pa_tagstruct *t, pa_proplist *p);
int pa_tagstruct_get_volume(pa_tagstruct *t, pa_volume_t *v);
int pa_tagstruct_get_format_info(pa_tagstruct *t, pa_format_info *f);
int pa_tagstruct_get_direction(pa_tagstruct *t, pa_direction_t *direction);
#endif