> -----Original Message----- > From: ffmpeg-devel [mailto:ffmpeg-devel-boun...@ffmpeg.org] On Behalf Of > Lynne > Sent: Friday, November 12, 2021 4:50 PM > To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org> > Subject: [EXT] Re: [FFmpeg-devel] [PATCH v1 2/2] avcodec/v4l2_buffer: export > v4l2 buffer dma-buf > > Caution: EXT Email > > 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.
Thanks for your information, I'll check it > _______________________________________________ > ffmpeg-devel mailing list > ffmpeg-devel@ffmpeg.org > https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fffmpeg. > org%2Fmailman%2Flistinfo%2Fffmpeg-devel&data=04%7C01%7Cming.qi > an%40nxp.com%7Caf21432e4cff441f393f08d9a5b97e57%7C686ea1d3bc2b4 > c6fa92cd99c5c301635%7C0%7C1%7C637723038369699316%7CUnknown%7 > CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiL > CJXVCI6Mn0%3D%7C3000&sdata=%2ByZOR2mWn1oTwn5xwkWFkbpb3 > bovbbEpXmH0T1D36%2FY%3D&reserved=0 > > To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org > with subject "unsubscribe". _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
