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Avoid zero-length copies

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Return early if there is nothing to read/write.
This commit is contained in:
Romain Vimont
2024-05-30 15:49:07 +02:00
parent 09e8c20168
commit fd9498e07c
1 changed files with 6 additions and 0 deletions
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6
app/src/util/audiobuf.c
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@@ -46,6 +46,9 @@ sc_audiobuf_read(struct sc_audiobuf *buf, void *to_, uint32_t samples_count) {
uint32_t head = atomic_load_explicit(&buf->head, memory_order_acquire); uint32_t head = atomic_load_explicit(&buf->head, memory_order_acquire);
uint32_t can_read = (buf->alloc_size + head - tail) % buf->alloc_size; uint32_t can_read = (buf->alloc_size + head - tail) % buf->alloc_size;
if (!can_read) {
return 0;
}
if (samples_count > can_read) { if (samples_count > can_read) {
samples_count = can_read; samples_count = can_read;
} }
@@ -86,6 +89,9 @@ sc_audiobuf_write(struct sc_audiobuf *buf, const void *from_,
uint32_t tail = atomic_load_explicit(&buf->tail, memory_order_acquire); uint32_t tail = atomic_load_explicit(&buf->tail, memory_order_acquire);
uint32_t can_write = (buf->alloc_size + tail - head - 1) % buf->alloc_size; uint32_t can_write = (buf->alloc_size + tail - head - 1) % buf->alloc_size;
if (!can_write) {
return 0;
}
if (samples_count > can_write) { if (samples_count > can_write) {
samples_count = can_write; samples_count = can_write;
} }