drivers/media/platform/samsung/s5p-mfc/s5p_mfc_dec.c

Source file repositories/reference/linux-study-clean/drivers/media/platform/samsung/s5p-mfc/s5p_mfc_dec.c

File Facts

System
Linux kernel
Corpus path
drivers/media/platform/samsung/s5p-mfc/s5p_mfc_dec.c
Extension
.c
Size
35573 bytes
Lines
1257
Domain
Driver Families
Bucket
drivers/media
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

if (!fmt) {
			mfc_err("Unsupported format for source.\n");
			return -EINVAL;
		}
		if (fmt->codec_mode == S5P_FIMV_CODEC_NONE) {
			mfc_err("Unknown codec\n");
			return -EINVAL;
		}
		if ((dev->variant->version_bit & fmt->versions) == 0) {
			mfc_err("Unsupported format by this MFC version.\n");
			return -EINVAL;
		}
	} else if (f->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) {
		fmt = find_format(f, MFC_FMT_RAW);
		if (!fmt) {
			mfc_err("Unsupported format for destination.\n");
			return -EINVAL;
		}
		if ((dev->variant->version_bit & fmt->versions) == 0) {
			mfc_err("Unsupported format by this MFC version.\n");
			return -EINVAL;
		}
	}

	return 0;
}

/* Set format */
static int vidioc_s_fmt(struct file *file, void *priv, struct v4l2_format *f)
{
	struct s5p_mfc_dev *dev = video_drvdata(file);
	struct s5p_mfc_ctx *ctx = file_to_ctx(file);
	int ret = 0;
	struct v4l2_pix_format_mplane *pix_mp;
	const struct s5p_mfc_buf_size *buf_size = dev->variant->buf_size;

	mfc_debug_enter();
	ret = vidioc_try_fmt(file, priv, f);
	pix_mp = &f->fmt.pix_mp;
	if (ret)
		return ret;
	if (vb2_is_streaming(&ctx->vq_src) || vb2_is_streaming(&ctx->vq_dst)) {
		v4l2_err(&dev->v4l2_dev, "%s queue busy\n", __func__);
		ret = -EBUSY;
		goto out;
	}
	if (f->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) {
		/* dst_fmt is validated by call to vidioc_try_fmt */
		ctx->dst_fmt = find_format(f, MFC_FMT_RAW);
		ret = 0;
		goto out;
	} else if (f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) {
		/* src_fmt is validated by call to vidioc_try_fmt */
		ctx->src_fmt = find_format(f, MFC_FMT_DEC);
		ctx->codec_mode = ctx->src_fmt->codec_mode;
		mfc_debug(2, "The codec number is: %d\n", ctx->codec_mode);
		pix_mp->height = 0;
		pix_mp->width = 0;
		if (pix_mp->plane_fmt[0].sizeimage == 0)
			pix_mp->plane_fmt[0].sizeimage = ctx->dec_src_buf_size =
								DEF_CPB_SIZE;
		else if (pix_mp->plane_fmt[0].sizeimage > buf_size->cpb)
			ctx->dec_src_buf_size = buf_size->cpb;
		else
			ctx->dec_src_buf_size = pix_mp->plane_fmt[0].sizeimage;
		pix_mp->plane_fmt[0].bytesperline = 0;
		ctx->state = MFCINST_INIT;
		ret = 0;
		goto out;
	} else {
		mfc_err("Wrong type error for S_FMT : %d", f->type);
		ret = -EINVAL;
		goto out;
	}

out:
	mfc_debug_leave();
	return ret;
}

static int reqbufs_output(struct s5p_mfc_dev *dev, struct s5p_mfc_ctx *ctx,
				struct v4l2_requestbuffers *reqbufs)
{
	int ret = 0;

	s5p_mfc_clock_on(dev);

	if (reqbufs->count == 0) {
		mfc_debug(2, "Freeing buffers\n");
		ret = vb2_reqbufs(&ctx->vq_src, reqbufs);

Annotation

Implementation Notes