From 5da9cbfb8785bd8c91dc9320e404294857919f47 Mon Sep 17 00:00:00 2001
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From: "vicent.chi" <vicent.chi@rock-chips.com>
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Date: Thu, 31 Oct 2019 11:46:12 +0800
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Subject: [PATCH 4/8] libv4l: add V4L2_MEMORY_DMABUF memory support
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Signed-off-by: vicent.chi <vicent.chi@rock-chips.com>
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---
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lib/libv4l2/libv4l2-priv.h | 1 +
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lib/libv4l2/libv4l2.c | 23 +++++++++++++++++++++--
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2 files changed, 22 insertions(+), 2 deletions(-)
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diff --git a/lib/libv4l2/libv4l2-priv.h b/lib/libv4l2/libv4l2-priv.h
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index 1924c91f..30dd1bc3 100644
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--- a/lib/libv4l2/libv4l2-priv.h
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+++ b/lib/libv4l2/libv4l2-priv.h
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@@ -104,6 +104,7 @@ struct v4l2_dev_info {
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void *plugin_library;
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void *dev_ops_priv;
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const struct libv4l_dev_ops *dev_ops;
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+ int has_dmabuf_memory;
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};
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/* From v4l2-plugin.c */
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diff --git a/lib/libv4l2/libv4l2.c b/lib/libv4l2/libv4l2.c
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index 0c02bec3..0b178889 100644
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--- a/lib/libv4l2/libv4l2.c
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+++ b/lib/libv4l2/libv4l2.c
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@@ -543,7 +543,7 @@ static int v4l2_deactivate_read_stream(int index)
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static int v4l2_needs_conversion(int index)
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{
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- if (devices[index].convert == NULL)
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+ if (devices[index].convert == NULL || devices[index].has_dmabuf_memory)
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return 0;
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return v4lconvert_needs_conversion(devices[index].convert,
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@@ -1305,12 +1305,18 @@ no_capture_request:
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struct v4l2_requestbuffers *req = arg;
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/* IMPROVEME (maybe?) add support for userptr's? */
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- if (req->memory != V4L2_MEMORY_MMAP) {
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+ if (req->memory != V4L2_MEMORY_MMAP && req->memory != V4L2_MEMORY_DMABUF) {
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errno = EINVAL;
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result = -1;
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break;
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}
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+ if (req->memory == V4L2_MEMORY_DMABUF) {
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+ devices[index].has_dmabuf_memory = 1;
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+ V4L2_LOG("memory type is V4L2_MEMORY_DMABUF, "
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+ "buf conversion and mmap emulation are disabled\n");
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+ }
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+
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result = v4l2_check_buffer_change_ok(index);
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if (result)
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break;
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@@ -1563,6 +1569,14 @@ ssize_t v4l2_read(int fd, void *dest, size_t n)
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goto leave;
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}
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+ if (!(devices[index].flags & V4L2_USE_READ_FOR_READ) &&
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+ devices[index].has_dmabuf_memory) {
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+ V4L2_PERROR("memory type is V4L2_MEMORY_DMABUF, "
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+ "no support v4l2 read\n");
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+ errno = EINVAL;
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+ return -1;
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+ }
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+
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/* Since we need to do conversion try to use mmap (streaming) mode under
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the hood as that safes a memcpy for each frame read.
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@@ -1627,6 +1641,7 @@ void *v4l2_mmap(void *start, size_t length, int prot, int flags, int fd,
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void *result;
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index = v4l2_get_index(fd);
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+
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if (index != -1 && devices[index].dev_ops->mmap) {
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pthread_mutex_lock(&devices[index].stream_lock);
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result = devices[index].dev_ops->mmap(
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@@ -1637,6 +1652,10 @@ void *v4l2_mmap(void *start, size_t length, int prot, int flags, int fd,
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return result;
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}
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+ if (index != -1 && devices[index].has_dmabuf_memory) {
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+ return (void *)SYS_MMAP(start, length, prot, flags, fd, offset);
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+ }
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+
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if (index == -1 ||
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/* Check if the mmap data matches our answer to QUERY_BUF. If it doesn't,
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let the kernel handle it (to allow for mmap-based non capture use) */
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--
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2.20.1
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