From 3d4c64e8617dbc9a430f57190302ad8c81276b3c Mon Sep 17 00:00:00 2001
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From: Jeffy Chen <jeffy.chen@rock-chips.com>
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Date: Sun, 28 Apr 2019 15:31:53 +0800
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Subject: [PATCH 2/8] libv4l2: Support mmap() to libv4l-plugin
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Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
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---
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lib/include/libv4l-plugin.h | 2 ++
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lib/libv4l2/libv4l2.c | 10 ++++++++++
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2 files changed, 12 insertions(+)
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diff --git a/lib/include/libv4l-plugin.h b/lib/include/libv4l-plugin.h
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index 23b2dfb1..acb0a546 100644
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--- a/lib/include/libv4l-plugin.h
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+++ b/lib/include/libv4l-plugin.h
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@@ -32,6 +32,8 @@ struct libv4l_dev_ops {
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int (*ioctl)(void *dev_ops_priv, int fd, unsigned long int request, void *arg);
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ssize_t (*read)(void *dev_ops_priv, int fd, void *buffer, size_t n);
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ssize_t (*write)(void *dev_ops_priv, int fd, const void *buffer, size_t n);
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+ void * (*mmap)(void *dev_ops_priv, void *start, size_t length, int prot,
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+ int flags, int fd, int64_t offset);
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/* For future plugin API extension, plugins implementing the current API
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must set these all to NULL, as future versions may check for these */
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void (*reserved1)(void);
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diff --git a/lib/libv4l2/libv4l2.c b/lib/libv4l2/libv4l2.c
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index 9ebf8c18..0c02bec3 100644
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--- a/lib/libv4l2/libv4l2.c
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+++ b/lib/libv4l2/libv4l2.c
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@@ -1627,6 +1627,16 @@ 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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+ 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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+ devices[index].dev_ops_priv, start,
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+ length, prot, flags, fd, offset);
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+
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+ pthread_mutex_unlock(&devices[index].stream_lock);
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+ return result;
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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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