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buffer: add EMPTY chunk flag

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Add an EMPTY chunk flag to mark a piece of memory as 'empty'. For audio
this means silence.
Use the empty flag to avoid mixing 0 samples.
Set the empty flag in output buffers on audioconvert.
This commit is contained in:
Wim Taymans 2022-06-24 11:09:01 +02:00
parent 71f3c759f4
commit f2dee23085
4 changed files with 18 additions and 5 deletions
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8
spa/plugins/audiomixer/mixer-dsp.c
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@ -744,8 +744,10 @@ static int impl_node_process(void *object)
i, inio, outio, inio->status, inio->buffer_id,
offs, size);
datas[n_buffers] = SPA_PTROFF(bd->data, offs, void);
buffers[n_buffers++] = inb;
if (!SPA_FLAG_IS_SET(bd->chunk->flags, SPA_CHUNK_FLAG_EMPTY)) {
datas[n_buffers] = SPA_PTROFF(bd->data, offs, void);
buffers[n_buffers++] = inb;
}
inio->status = SPA_STATUS_NEED_DATA;
}
@ -759,6 +761,7 @@ static int impl_node_process(void *object)
*outb->buffer = *buffers[0]->buffer;
} else {
struct spa_data *d = outb->buf.datas;
*outb->buffer = outb->buf;
maxsize = SPA_MIN(maxsize, d[0].maxsize);
@ -766,6 +769,7 @@ static int impl_node_process(void *object)
d[0].chunk->offset = 0;
d[0].chunk->size = maxsize;
d[0].chunk->stride = sizeof(float);
SPA_FLAG_UPDATE(d[0].chunk->flags, SPA_CHUNK_FLAG_EMPTY, n_buffers == 0);
spa_log_trace_fp(this->log, "%p: %d mix %d", this, n_buffers, maxsize);