1From cbd7ca7fb4c71bb6e2a763433140ae5ca386839c Mon Sep 17 00:00:00 2001 2From: Jeffy Chen <jeffy.chen@rock-chips.com> 3Date: Sun, 28 Apr 2019 15:31:53 +0800 4Subject: [PATCH 1/7] libv4l2: Support mmap() to libv4l-plugin 5 6Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com> 7--- 8 lib/include/libv4l-plugin.h | 2 ++ 9 lib/libv4l2/libv4l2.c | 10 ++++++++++ 10 2 files changed, 12 insertions(+) 11 12diff --git a/lib/include/libv4l-plugin.h b/lib/include/libv4l-plugin.h 13index 23b2dfb..acb0a54 100644 14--- a/lib/include/libv4l-plugin.h 15+++ b/lib/include/libv4l-plugin.h 16@@ -32,6 +32,8 @@ struct libv4l_dev_ops { 17 int (*ioctl)(void *dev_ops_priv, int fd, unsigned long int request, void *arg); 18 ssize_t (*read)(void *dev_ops_priv, int fd, void *buffer, size_t n); 19 ssize_t (*write)(void *dev_ops_priv, int fd, const void *buffer, size_t n); 20+ void * (*mmap)(void *dev_ops_priv, void *start, size_t length, int prot, 21+ int flags, int fd, int64_t offset); 22 /* For future plugin API extension, plugins implementing the current API 23 must set these all to NULL, as future versions may check for these */ 24 void (*reserved1)(void); 25diff --git a/lib/libv4l2/libv4l2.c b/lib/libv4l2/libv4l2.c 26index 9ebf8c1..0c02bec 100644 27--- a/lib/libv4l2/libv4l2.c 28+++ b/lib/libv4l2/libv4l2.c 29@@ -1627,6 +1627,16 @@ void *v4l2_mmap(void *start, size_t length, int prot, int flags, int fd, 30 void *result; 31 32 index = v4l2_get_index(fd); 33+ if (index != -1 && devices[index].dev_ops->mmap) { 34+ pthread_mutex_lock(&devices[index].stream_lock); 35+ result = devices[index].dev_ops->mmap( 36+ devices[index].dev_ops_priv, start, 37+ length, prot, flags, fd, offset); 38+ 39+ pthread_mutex_unlock(&devices[index].stream_lock); 40+ return result; 41+ } 42+ 43 if (index == -1 || 44 /* Check if the mmap data matches our answer to QUERY_BUF. If it doesn't, 45 let the kernel handle it (to allow for mmap-based non capture use) */ 46-- 472.20.1 48 49