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v4l2: detect driver reusing buffers

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Some drivers seem to only use 2 buffers when asked for 16 buffers. We
can see this because the buffer is already queued. In this case, just
use the 2 buffers.

See #294
This commit is contained in:
Wim Taymans 2020-09-29 12:33:14 +02:00
parent 2df10d1a40
commit ed1ee3f164
1 changed files with 12 additions and 5 deletions
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17
spa/plugins/v4l2/v4l2-utils.c
View file

@ -1407,13 +1407,13 @@ mmap_init(struct impl *this,
spa_log_debug(this->log, "v4l2: got %d buffers", reqbuf.count);
n_buffers = reqbuf.count;
if (reqbuf.count < 2) {
if (n_buffers < 2) {
spa_log_error(this->log, "v4l2: '%s' can't allocate enough buffers (%d)",
this->props.device, reqbuf.count);
this->props.device, n_buffers);
return -ENOMEM;
}
for (i = 0; i < reqbuf.count; i++) {
for (i = 0; i < n_buffers; i++) {
struct buffer *b;
struct spa_data *d;
@ -1438,6 +1438,13 @@ mmap_init(struct impl *this,
return -errno;
}
if (b->v4l2_buffer.flags & V4L2_BUF_FLAG_QUEUED) {
/* some drivers can give us an already queued buffer. */
spa_log_warn(this->log, "v4l2: buffer %d was already queued", i);
n_buffers = i;
break;
}
d = buffers[i]->datas;
d[0].mapoffset = 0;
d[0].maxsize = b->v4l2_buffer.length;
@ -1479,10 +1486,10 @@ fallback:
}
spa_v4l2_buffer_recycle(this, i);
}
spa_log_info(this->log, "v4l2: have %u buffers using %s", reqbuf.count,
spa_log_info(this->log, "v4l2: have %u buffers using %s", n_buffers,
port->have_expbuf ? "EXPBUF" : "MMAP");
port->n_buffers = reqbuf.count;
port->n_buffers = n_buffers;
return 0;
}