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modules: implement mixing in combine stream

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When the combine-stream module is used as a source and the input streams
are overlapping, mix the samples instead of overwriting the previous
samples.

See #3710
This commit is contained in:
Wim Taymans 2024-08-26 15:59:38 +02:00
parent b46673b475
commit fc3d7cf7c7
1 changed files with 45 additions and 2 deletions
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47
src/modules/module-combine-stream.c
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@ -391,6 +391,40 @@ static void ringbuffer_memcpy(struct ringbuffer *r, void *dst, void *src, uint32
}
}
static void mix_f32(float *dst, float *src, uint32_t size)
{
uint32_t i, s = size / sizeof(float);
for (i = 0; i < s; i++)
dst[i] += src[i];
}
static void ringbuffer_mix(struct ringbuffer *r, void *dst, void *src, uint32_t size)
{
uint32_t avail;
avail = SPA_MIN(size, r->size);
/* buf to dst */
if (dst && avail > 0) {
uint32_t l0 = SPA_MIN(avail, r->size - r->idx), l1 = avail - l0;
mix_f32(dst, SPA_PTROFF(r->buf, r->idx, void), l0);
if (SPA_UNLIKELY(l1 > 0))
mix_f32(SPA_PTROFF(dst, l0, void), r->buf, l1);
dst = SPA_PTROFF(dst, avail, void);
}
/* src to dst */
if (size > avail) {
if (dst)
mix_f32(dst, src, size - avail);
src = SPA_PTROFF(src, size - avail, void);
}
/* src to buf */
if (avail > 0) {
spa_ringbuffer_write_data(NULL, r->buf, r->size, r->idx, src, avail);
r->idx = (r->idx + avail) % r->size;
}
}
static void ringbuffer_copy(struct ringbuffer *dst, struct ringbuffer *src)
{
uint32_t l0, l1;
@ -1172,11 +1206,14 @@ static void combine_output_process(void *d)
struct pw_buffer *in, *out;
struct stream *s;
bool delay_changed = false;
bool mix[SPA_AUDIO_MAX_CHANNELS];
if ((out = pw_stream_dequeue_buffer(impl->combine)) == NULL) {
pw_log_debug("%p: out of output buffers: %m", impl);
return;
}
for (uint32_t i = 0; i < out->buffer->n_datas; i++)
mix[i] = false;
spa_list_for_each(s, &impl->streams, link) {
uint32_t j;
@ -1220,8 +1257,14 @@ static void combine_output_process(void *d)
size = SPA_MIN(ds->chunk->size, ds->maxsize - offs);
size = SPA_MIN(size, dd->maxsize);
ringbuffer_memcpy(&s->delay[j],
dd->data, SPA_PTROFF(ds->data, offs, void), size);
if (mix[remap]) {
ringbuffer_mix(&s->delay[j],
dd->data, SPA_PTROFF(ds->data, offs, void), size);
} else {
ringbuffer_memcpy(&s->delay[j],
dd->data, SPA_PTROFF(ds->data, offs, void), size);
mix[remap] = true;
}
outsize = SPA_MAX(outsize, size);
stride = SPA_MAX(stride, ds->chunk->stride);