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v4l2: probe EXPBUF and disable alloc_buffer flag

Browse source 
After we set the format, probe if we can do EXPBUF and enable/disable
the ALLOC_BUFFERS flag on the port.

This should gracefully handle the case where EXPBUF is not available.

Fixes #3821
This commit is contained in:
Wim Taymans 2024-01-29 16:37:16 +01:00
parent 18b112bcfe
commit c690aedc89
2 changed files with 46 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

4
spa/plugins/v4l2/v4l2-source.c
View file

@ -71,6 +71,7 @@ struct port {
struct impl *impl;
bool alloc_buffers;
bool probed_expbuf;
bool have_expbuf;
bool next_fmtdesc;
@ -1020,8 +1021,7 @@ impl_init(const struct spa_handle_factory *factory,
port->info.params = port->params;
port->info.n_params = N_PORT_PARAMS;
port->alloc_buffers = true;
port->have_expbuf = true;
port->probed_expbuf = false;
port->have_query_ext_ctrl = true;
port->dev.log = this->log;
port->dev.fd = -1;

44
spa/plugins/v4l2/v4l2-utils.c
View file

@ -867,6 +867,48 @@ do_enum_fmt:
return res;
}
static int probe_expbuf(struct impl *this)
{
struct port *port = &this->out_ports[0];
struct spa_v4l2_device *dev = &port->dev;
struct v4l2_requestbuffers reqbuf;
struct v4l2_exportbuffer expbuf;
if (port->probed_expbuf)
return 0;
port->probed_expbuf = true;
spa_zero(reqbuf);
reqbuf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
reqbuf.memory = V4L2_MEMORY_MMAP;
reqbuf.count = 2;
if (xioctl(dev->fd, VIDIOC_REQBUFS, &reqbuf) < 0) {
spa_log_error(this->log, "'%s' VIDIOC_REQBUFS: %m", this->props.device);
return -errno;
}
spa_zero(expbuf);
expbuf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
expbuf.index = 0;
expbuf.flags = O_CLOEXEC | O_RDONLY;
if (xioctl(dev->fd, VIDIOC_EXPBUF, &expbuf) < 0) {
spa_log_info(this->log, "'%s' EXPBUF not supported: %m", this->props.device);
port->have_expbuf = false;
port->alloc_buffers = false;
} else {
port->have_expbuf = true;
port->alloc_buffers = true;
}
reqbuf.count = 0;
if (xioctl(dev->fd, VIDIOC_REQBUFS, &reqbuf) < 0) {
spa_log_error(this->log, "'%s' VIDIOC_REQBUFS: %m", this->props.device);
return -errno;
}
return 0;
}
static int spa_v4l2_set_format(struct impl *this, struct spa_video_info *format, uint32_t flags)
{
struct port *port = &this->out_ports[0];
@ -973,6 +1015,8 @@ static int spa_v4l2_set_format(struct impl *this, struct spa_video_info *format,
port->rate.denom = framerate->num = streamparm.parm.capture.timeperframe.denominator;
port->rate.num = framerate->denom = streamparm.parm.capture.timeperframe.numerator;
probe_expbuf(this);
port->fmt = fmt;
port->info.change_mask |= SPA_PORT_CHANGE_MASK_FLAGS | SPA_PORT_CHANGE_MASK_RATE;
port->info.flags = (port->alloc_buffers ? SPA_PORT_FLAG_CAN_ALLOC_BUFFERS : 0) |