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v4l2: don't mmap when the buffer has data already

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When the buffer has data (but no fd), don't mmap the buffer but simply
use the data pointer directly.

This makes v4l2 work with inlined buffer memory.
This commit is contained in:
Wim Taymans 2022-11-07 11:52:02 +01:00
parent 6bae31e519
commit 6cffabd09d
1 changed files with 15 additions and 3 deletions
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14
pipewire-v4l2/src/pipewire-v4l2.c
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@ -1290,6 +1290,7 @@ static void on_stream_param_changed(void *data, uint32_t id, const struct spa_po
SPA_PARAM_BUFFERS_stride, SPA_POD_CHOICE_RANGE_Int(stride, 0, INT_MAX),
SPA_PARAM_BUFFERS_dataType, SPA_POD_CHOICE_FLAGS_Int((1<<SPA_DATA_MemFd)));
pw_stream_update_params(file->stream, params, n_params);
}
@ -2133,7 +2134,10 @@ static void *v4l2_mmap(void *addr, size_t length, int prot,
if (!SPA_FLAG_IS_SET(data->flags, SPA_DATA_FLAG_WRITABLE))
prot &= ~PROT_WRITE;
if (data->data == NULL)
res = globals.old_fops.mmap(addr, range.size, prot, flags, data->fd, range.offset);
else
res = data->data;
add_file_map(file, res);
add_buffer_map(file, res, id);
@ -2153,7 +2157,9 @@ static int v4l2_munmap(void *addr, size_t length)
{
int res;
struct buffer_map *bmap;
struct buffer *buf;
struct file *file;
struct spa_data *data;
if ((file = remove_file_map(addr)) == NULL)
return globals.old_fops.munmap(addr, length);
@ -2165,12 +2171,18 @@ static int v4l2_munmap(void *addr, size_t length)
res = -EINVAL;
goto exit_unlock;
}
buf = &file->buffers[bmap->id];
data = &buf->buf->buffer->datas[0];
if (data->data == NULL)
res = globals.old_fops.munmap(addr, length);
else
res = 0;
pw_log_info("addr:%p length:%zu -> %d (%s)", addr, length,
res, strerror(res < 0 ? errno : 0));
file->buffers[bmap->id].v4l2.flags &= ~V4L2_BUF_FLAG_MAPPED;
buf->v4l2.flags &= ~V4L2_BUF_FLAG_MAPPED;
remove_buffer_map(file, bmap);
exit_unlock: