12 Nov 2021, 09:36 by ming.q...@nxp.com:
> Signed-off-by: Ming Qian <ming.q...@nxp.com>
> ---
> libavcodec/v4l2_buffers.c | 14 ++++++++++++++
> libavcodec/v4l2_buffers.h | 1 +
> libavcodec/v4l2_context.c | 4 ++++
> 3 files changed, 19 insertions(+)
>
> diff --git a/libavcodec/v4l2_buffers.c b/libavcodec/v4l2_buffers.c
> index 4b2679eb3814..efa42f4c58ea 100644
> --- a/libavcodec/v4l2_buffers.c
> +++ b/libavcodec/v4l2_buffers.c
> @@ -21,6 +21,9 @@
> * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
> USA
> */
>
> +#ifndef _GNU_SOURCE
> +#define _GNU_SOURCE
> +#endif
> #include <linux/videodev2.h>
> #include <sys/ioctl.h>
> #include <sys/mman.h>
> @@ -267,6 +270,8 @@ static int v4l2_buf_to_bufref(V4L2Buffer *in, int plane,
> AVBufferRef **buf)
> if (!*buf)
> return AVERROR(ENOMEM);
>
> + if (in->plane_info[plane].dmafd >= 0)
> + av_buffer_set_dma_buf(*buf, in->plane_info[plane].dmafd);
> ret = v4l2_buf_increase_ref(in);
> if (ret)
> av_buffer_unref(buf);
> @@ -494,6 +499,7 @@ int ff_v4l2_buffer_avpkt_to_buf(const AVPacket *pkt,
> V4L2Buffer *out)
> int ff_v4l2_buffer_initialize(V4L2Buffer* avbuf, int index)
> {
> V4L2Context *ctx = avbuf->context;
> + struct v4l2_exportbuffer exp;
> int ret, i;
>
> avbuf->buf.memory = V4L2_MEMORY_MMAP;
> @@ -539,6 +545,14 @@ int ff_v4l2_buffer_initialize(V4L2Buffer* avbuf, int
> index)
>
> if (avbuf->plane_info[i].mm_addr == MAP_FAILED)
> return AVERROR(ENOMEM);
> +
> + exp.type = ctx->type;
> + exp.index = avbuf->buf.index;
> + exp.plane = i;
> + exp.fd = -1;
> + exp.flags = O_CLOEXEC | O_RDWR;
> + ioctl(buf_to_m2mctx(avbuf)->fd, VIDIOC_EXPBUF, &exp);
> + avbuf->plane_info[i].dmafd = exp.fd;
> }
>
> avbuf->status = V4L2BUF_AVAILABLE;
> diff --git a/libavcodec/v4l2_buffers.h b/libavcodec/v4l2_buffers.h
> index 3d2ff1b9a5d7..74550544e0eb 100644
> --- a/libavcodec/v4l2_buffers.h
> +++ b/libavcodec/v4l2_buffers.h
> @@ -55,6 +55,7 @@ typedef struct V4L2Buffer {
> int bytesperline;
> void * mm_addr;
> size_t length;
> + int dmafd;
> } plane_info[VIDEO_MAX_PLANES];
>
> int num_planes;
> diff --git a/libavcodec/v4l2_context.c b/libavcodec/v4l2_context.c
> index b08f0015c2e5..f0406194293d 100644
> --- a/libavcodec/v4l2_context.c
> +++ b/libavcodec/v4l2_context.c
> @@ -453,6 +453,10 @@ static int v4l2_release_buffers(V4L2Context* ctx)
> if (p->mm_addr && p->length)
> if (munmap(p->mm_addr, p->length) < 0)
> av_log(logger(ctx), AV_LOG_ERROR, "%s unmap plane (%s))\n", ctx->name,
> av_err2str(AVERROR(errno)));
> + if (p->dmafd >= 0) {
> + close(p->dmafd);
> + p->dmafd = -1;
> + }
> }
> }
>
We already have a standard structure for representing DRM frames,
it's AV_PIX_FMT_DRM_PRIME, which encapsulates a AVDRMFrameDescriptor,
which contains DRM fds for every plane, and layer description.
I think there may have been an old patch which did this, but I don't remember.
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