[PATCH v2 6/6] media: vicodec: Add support for resolution change event.

[Dafna Hirschfeld <dafna3@gmail.com>]

If the the queues are not streaming then the first resolution
change is handled in the buf_queue callback.
The following resolution change events are handled in job_ready.

Signed-off-by: Dafna Hirschfeld <dafna3@gmail.com>
---
 drivers/media/platform/vicodec/vicodec-core.c | 381 ++++++++++++++----
 1 file changed, 304 insertions(+), 77 deletions(-)

diff --git a/drivers/media/platform/vicodec/vicodec-core.c b/drivers/media/platform/vicodec/vicodec-core.c
index c97300344fbd..44f2ed59f4a3 100644
--- a/drivers/media/platform/vicodec/vicodec-core.c
+++ b/drivers/media/platform/vicodec/vicodec-core.c
@@ -129,6 +129,8 @@ struct vicodec_ctx {
 	u32			comp_frame_size;
 	bool			comp_has_frame;
 	bool			comp_has_next_frame;
+	bool			first_source_change_sent;
+	bool			source_changed;
 };
 
 static inline struct vicodec_ctx *file2ctx(struct file *file)
@@ -322,6 +324,107 @@ static void job_remove_src_buf(struct vicodec_ctx *ctx, u32 state)
 	spin_unlock(ctx->lock);
 }
 
+static const struct v4l2_fwht_pixfmt_info *info_from_header(struct fwht_cframe_hdr p_hdr)
+{
+	unsigned int flags = ntohl(p_hdr.flags);
+	unsigned int width_div = (flags & FWHT_FL_CHROMA_FULL_WIDTH) ? 1 : 2;
+	unsigned int height_div = (flags & FWHT_FL_CHROMA_FULL_HEIGHT) ? 1 : 2;
+	unsigned int components_num = 3;
+	unsigned int pixenc = 0;
+	unsigned int version = ntohl(p_hdr.version);
+
+	if (version == FWHT_VERSION) {
+		components_num = 1 + ((flags & FWHT_FL_COMPONENTS_NUM_MSK) >>
+				FWHT_FL_COMPONENTS_NUM_OFFSET);
+		pixenc = (flags & FWHT_FL_PIXENC_MSK);
+	}
+	return v4l2_fwht_default_fmt(width_div, height_div, version,
+				     components_num, pixenc, 0);
+}
+
+static bool is_header_valid(struct fwht_cframe_hdr p_hdr)
+{
+	const struct v4l2_fwht_pixfmt_info *info;
+	unsigned int w = ntohl(p_hdr.width);
+	unsigned int h = ntohl(p_hdr.height);
+	unsigned int version = ntohl(p_hdr.version);
+	unsigned int flags = ntohl(p_hdr.flags);
+
+	if (p_hdr.magic1 != FWHT_MAGIC1 || p_hdr.magic2 != FWHT_MAGIC2)
+		return false;
+
+	if (!version || version > FWHT_VERSION)
+		return false;
+
+	if (w < MIN_WIDTH || w > MAX_WIDTH || h < MIN_HEIGHT || h > MAX_HEIGHT)
+		return false;
+
+	if (version == FWHT_VERSION) {
+		unsigned int components_num = 1 +
+			((flags & FWHT_FL_COMPONENTS_NUM_MSK) >>
+			FWHT_FL_COMPONENTS_NUM_OFFSET);
+		unsigned int pixenc = flags & FWHT_FL_PIXENC_MSK;
+
+		if (components_num == 0 || components_num > 4 || pixenc == BIT(19))
+			return false;
+	}
+
+	info = info_from_header(p_hdr);
+	if (!info)
+		return false;
+	return true;
+}
+
+static void update_capture_data_from_header(struct vicodec_ctx *ctx)
+{
+	struct vicodec_q_data *q_dst = get_q_data(ctx,
+						  V4L2_BUF_TYPE_VIDEO_CAPTURE);
+	struct fwht_cframe_hdr p_hdr = ctx->state.header;
+	const struct v4l2_fwht_pixfmt_info *info = info_from_header(p_hdr);
+	unsigned int flags = ntohl(p_hdr.flags);
+	unsigned int hdr_width_div = (flags & FWHT_FL_CHROMA_FULL_WIDTH) ? 1 : 2;
+	unsigned int hdr_height_div = (flags & FWHT_FL_CHROMA_FULL_HEIGHT) ? 1 : 2;
+
+	q_dst->info = info;
+	q_dst->visible_width = ntohl(p_hdr.width);
+	q_dst->visible_height = ntohl(p_hdr.height);
+	q_dst->coded_width = vic_round_dim(q_dst->visible_width, hdr_width_div);
+	q_dst->coded_height = vic_round_dim(q_dst->visible_height,
+					    hdr_height_div);
+
+	q_dst->sizeimage = q_dst->coded_width * q_dst->coded_height *
+		q_dst->info->sizeimage_mult / q_dst->info->sizeimage_div;
+	ctx->state.colorspace = ntohl(p_hdr.colorspace);
+
+	ctx->state.xfer_func = ntohl(p_hdr.xfer_func);
+	ctx->state.ycbcr_enc = ntohl(p_hdr.ycbcr_enc);
+	ctx->state.quantization = ntohl(p_hdr.quantization);
+}
+
+static void set_last_buffer(struct vb2_v4l2_buffer *dst_buf,
+			    struct vb2_v4l2_buffer *src_buf,
+			    struct vicodec_ctx *ctx)
+{
+	struct vicodec_q_data *q_dst = get_q_data(ctx,
+						  V4L2_BUF_TYPE_VIDEO_CAPTURE);
+
+	vb2_set_plane_payload(&dst_buf->vb2_buf, 0, 0);
+	dst_buf->sequence = q_dst->sequence++;
+	dst_buf->vb2_buf.timestamp = src_buf->vb2_buf.timestamp;
+
+	if (src_buf->flags & V4L2_BUF_FLAG_TIMECODE)
+		dst_buf->timecode = src_buf->timecode;
+	dst_buf->field = src_buf->field;
+	dst_buf->flags |= src_buf->flags &
+		(V4L2_BUF_FLAG_TIMECODE |
+		 V4L2_BUF_FLAG_KEYFRAME |
+		 V4L2_BUF_FLAG_PFRAME |
+		 V4L2_BUF_FLAG_BFRAME |
+		 V4L2_BUF_FLAG_TSTAMP_SRC_MASK);
+	dst_buf->flags |= V4L2_BUF_FLAG_LAST;
+	v4l2_m2m_buf_done(dst_buf, VB2_BUF_STATE_DONE);
+}
+
 static int job_ready(void *priv)
 {
 	static const u8 magic[] = {
@@ -333,7 +436,15 @@ static int job_ready(void *priv)
 	u8 *p;
 	u32 sz;
 	u32 state;
-
+	struct vicodec_q_data *q_dst = get_q_data(ctx,
+						  V4L2_BUF_TYPE_VIDEO_CAPTURE);
+	unsigned int flags;
+	unsigned int hdr_width_div;
+	unsigned int hdr_height_div;
+	unsigned int max_to_copy;
+
+	if (ctx->source_changed)
+		return 0;
 	if (ctx->is_enc || ctx->comp_has_frame)
 		return 1;
 
@@ -358,11 +469,17 @@ static int job_ready(void *priv)
 
 	ctx->comp_frame_size = ntohl(ctx->state.header.size);
 
-	if (ctx->comp_frame_size > ctx->comp_max_size)
-		ctx->comp_frame_size = ctx->comp_max_size;
+	/*
+	 * The current scanned frame might be the first frame of a new
+	 * resolution so its size might be larger than ctx->comp_max_size.
+	 * In that case it is copied up to the current buffer capacity and
+	 * the copy will continue after allocating new large enough buffer
+	 * when restreaming
+	 */
+	max_to_copy = min(ctx->comp_frame_size, ctx->comp_max_size);
 
-	if (ctx->comp_size < ctx->comp_frame_size) {
-		u32 copy = ctx->comp_frame_size - ctx->comp_size;
+	if (ctx->comp_size < max_to_copy) {
+		u32 copy = max_to_copy - ctx->comp_size;
 
 		if (copy > p_src + sz - p)
 			copy = p_src + sz - p;
@@ -371,15 +488,16 @@ static int job_ready(void *priv)
 		       p, copy);
 		p += copy;
 		ctx->comp_size += copy;
-		if (ctx->comp_size < ctx->comp_frame_size) {
+		if (ctx->comp_size < max_to_copy) {
 			job_remove_src_buf(ctx, state);
 			goto restart;
 		}
 	}
 	ctx->cur_buf_offset = p - p_src;
-	ctx->comp_has_frame = true;
+	if (ctx->comp_size == ctx->comp_frame_size)
+		ctx->comp_has_frame = true;
 	ctx->comp_has_next_frame = false;
-	if (sz - ctx->cur_buf_offset >= sizeof(struct fwht_cframe_hdr)) {
+	if (ctx->comp_has_frame && sz - ctx->cur_buf_offset >= sizeof(struct fwht_cframe_hdr)) {
 		struct fwht_cframe_hdr *p_hdr = (struct fwht_cframe_hdr *)p;
 		u32 frame_size = ntohl(p_hdr->size);
 		u32 remaining = sz - ctx->cur_buf_offset - sizeof(*p_hdr);
@@ -387,6 +505,36 @@ static int job_ready(void *priv)
 		if (!memcmp(p, magic, sizeof(magic)))
 			ctx->comp_has_next_frame = remaining >= frame_size;
 	}
+	/*
+	 * if the header is invalid the device_run will just drop the frame
+	 * with an error
+	 */
+	if (!is_header_valid(ctx->state.header) && ctx->comp_has_frame)
+		return 1;
+	flags = ntohl(ctx->state.header.flags);
+	hdr_width_div = (flags & FWHT_FL_CHROMA_FULL_WIDTH) ? 1 : 2;
+	hdr_height_div = (flags & FWHT_FL_CHROMA_FULL_HEIGHT) ? 1 : 2;
+
+	if (ntohl(ctx->state.header.width) != q_dst->visible_width ||
+	    ntohl(ctx->state.header.height) != q_dst->visible_height ||
+	    !q_dst->info ||
+	    hdr_width_div != q_dst->info->width_div ||
+	    hdr_height_div != q_dst->info->height_div) {
+		static const struct v4l2_event rs_event = {
+			.type = V4L2_EVENT_SOURCE_CHANGE,
+			.u.src_change.changes = V4L2_EVENT_SRC_CH_RESOLUTION,
+		};
+
+		struct vb2_v4l2_buffer *dst_buf =
+			v4l2_m2m_dst_buf_remove(ctx->fh.m2m_ctx);
+
+		update_capture_data_from_header(ctx);
+		ctx->first_source_change_sent = true;
+		v4l2_event_queue_fh(&ctx->fh, &rs_event);
+		set_last_buffer(dst_buf, src_buf, ctx);
+		ctx->source_changed = true;
+		return 0;
+	}
 	return 1;
 }
 
@@ -426,7 +574,7 @@ static int enum_fmt(struct v4l2_fmtdesc *f, struct vicodec_ctx *ctx, bool is_out
 	if (is_uncomp) {
 		const struct v4l2_fwht_pixfmt_info *info = get_q_data(ctx, f->type)->info;
 
-		if (ctx->is_enc)
+		if (!info || ctx->is_enc)
 			info = v4l2_fwht_get_pixfmt(f->index);
 		else
 			info = v4l2_fwht_default_fmt(info->width_div,
@@ -477,6 +625,9 @@ static int vidioc_g_fmt(struct vicodec_ctx *ctx, struct v4l2_format *f)
 	q_data = get_q_data(ctx, f->type);
 	info = q_data->info;
 
+	if (!info)
+		info = v4l2_fwht_get_pixfmt(0);
+
 	switch (f->type) {
 	case V4L2_BUF_TYPE_VIDEO_CAPTURE:
 	case V4L2_BUF_TYPE_VIDEO_OUTPUT:
@@ -950,6 +1101,7 @@ static int vicodec_subscribe_event(struct v4l2_fh *fh,
 {
 	switch (sub->type) {
 	case V4L2_EVENT_EOS:
+	case V4L2_EVENT_SOURCE_CHANGE:
 		return v4l2_event_subscribe(fh, sub, 0, NULL);
 	default:
 		return v4l2_ctrl_subscribe_event(fh, sub);
@@ -1058,7 +1210,64 @@ static void vicodec_buf_queue(struct vb2_buffer *vb)
 {
 	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
 	struct vicodec_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
+	unsigned int sz = vb2_get_plane_payload(&vbuf->vb2_buf, 0);
+	u8 *p_src = vb2_plane_vaddr(&vbuf->vb2_buf, 0);
+	u8 *p = p_src;
+	struct vb2_queue *vq_out = v4l2_m2m_get_vq(ctx->fh.m2m_ctx,
+						   V4L2_BUF_TYPE_VIDEO_OUTPUT);
+	struct vb2_queue *vq_cap = v4l2_m2m_get_vq(ctx->fh.m2m_ctx,
+						   V4L2_BUF_TYPE_VIDEO_CAPTURE);
+
+	/* buf_queue handles only the first source change event */
+	if (ctx->first_source_change_sent) {
+		v4l2_m2m_buf_queue(ctx->fh.m2m_ctx, vbuf);
+		return;
+	}
+	/*
+	 * if both queues are streaming, the source change event is
+	 * handled in job_ready
+	 */
+	if (vb2_is_streaming(vq_cap) && vb2_is_streaming(vq_out)) {
+		v4l2_m2m_buf_queue(ctx->fh.m2m_ctx, vbuf);
+		return;
+	}
+
+	if (!ctx->is_enc && V4L2_TYPE_IS_OUTPUT(vb->vb2_queue->type)) {
+		bool header_valid = false;
+		static const struct v4l2_event rs_event = {
+			.type = V4L2_EVENT_SOURCE_CHANGE,
+			.u.src_change.changes = V4L2_EVENT_SRC_CH_RESOLUTION,
+		};
+
+		do {
+			enum vb2_buffer_state state = get_next_header(ctx, p_src, sz,
+								      (u8 *)&ctx->state.header,
+								      &p);
+
+			if (ctx->header_size < sizeof(struct fwht_cframe_hdr)) {
+				v4l2_m2m_buf_done(vbuf, state);
+				return;
+			}
+			header_valid = is_header_valid(ctx->state.header);
+			/*
+			 * p points right after the end of the header in the
+			 * buffer. If the header is invalid we set p to point
+			 * to the next byte after the start of the header
+			 */
+			if (!header_valid) {
+				p = p - sizeof(struct fwht_cframe_hdr) + 1;
+				ctx->header_size = 0;
+				ctx->comp_magic_cnt = 0;
+			}
+
+		} while (!header_valid);
+		if (p < p_src + sz)
+			ctx->cur_buf_offset = p - p_src;
 
+		update_capture_data_from_header(ctx);
+		ctx->first_source_change_sent = true;
+		v4l2_event_queue_fh(&ctx->fh, &rs_event);
+	}
 	v4l2_m2m_buf_queue(ctx->fh.m2m_ctx, vbuf);
 }
 
@@ -1087,73 +1296,80 @@ static int vicodec_start_streaming(struct vb2_queue *q,
 	struct vicodec_q_data *q_data = get_q_data(ctx, q->type);
 	struct v4l2_fwht_state *state = &ctx->state;
 	const struct v4l2_fwht_pixfmt_info *info = q_data->info;
-	unsigned int size = q_data->coded_width * q_data->coded_height;
-	unsigned int chroma_div = info->width_div * info->height_div;
-	unsigned int total_planes_size;
 
-	/*
-	 * we don't know ahead how many components are in the encoding type
-	 * V4L2_PIX_FMT_FWHT, so we will allocate space for 4 planes.
-	 */
-	if (info->id == V4L2_PIX_FMT_FWHT || info->components_num == 4)
-		total_planes_size = 2 * size + 2 * (size / chroma_div);
-	else if (info->components_num == 3)
-		total_planes_size = size + 2 * (size / chroma_div);
-	else
-		total_planes_size = size;
+	if (!info)
+		return -EINVAL;
 
 	q_data->sequence = 0;
 
-	if (!V4L2_TYPE_IS_OUTPUT(q->type)) {
-		if (!ctx->is_enc) {
-			state->visible_width = q_data->visible_width;
-			state->visible_height = q_data->visible_height;
-			state->coded_width = q_data->coded_width;
-			state->coded_height = q_data->coded_height;
-			state->stride = q_data->coded_width * info->bytesperline_mult;
+	ctx->last_src_buf = NULL;
+	ctx->last_dst_buf = NULL;
+	state->gop_cnt = 0;
+
+	if ((!V4L2_TYPE_IS_OUTPUT(q->type) && !ctx->is_enc) ||
+	    (V4L2_TYPE_IS_OUTPUT(q->type) && ctx->is_enc)) {
+		unsigned int size = q_data->coded_width * q_data->coded_height;
+		unsigned int chroma_div = info->width_div * info->height_div;
+		unsigned int total_planes_size;
+		u8 *new_comp_frame;
+
+		if (!info || info->id == V4L2_PIX_FMT_FWHT) {
+			vicodec_return_bufs(q, VB2_BUF_STATE_QUEUED);
+			return -EINVAL;
 		}
-		return 0;
-	}
+		if (info->components_num == 4)
+			total_planes_size = 2 * size + 2 * (size / chroma_div);
+		else if (info->components_num == 3)
+			total_planes_size = size + 2 * (size / chroma_div);
+		else
+			total_planes_size = size;
 
-	if (ctx->is_enc) {
 		state->visible_width = q_data->visible_width;
 		state->visible_height = q_data->visible_height;
 		state->coded_width = q_data->coded_width;
 		state->coded_height = q_data->coded_height;
 		state->stride = q_data->coded_width * info->bytesperline_mult;
-	}
-	state->ref_frame.luma = kvmalloc(total_planes_size, GFP_KERNEL);
-	ctx->comp_max_size = total_planes_size;
-	state->compressed_frame = kvmalloc(ctx->comp_max_size, GFP_KERNEL);
-	if (!state->ref_frame.luma || !state->compressed_frame) {
-		kvfree(state->ref_frame.luma);
-		kvfree(state->compressed_frame);
-		vicodec_return_bufs(q, VB2_BUF_STATE_QUEUED);
-		return -ENOMEM;
-	}
-	if (info->id == V4L2_PIX_FMT_FWHT || info->components_num >= 3) {
-		state->ref_frame.cb = state->ref_frame.luma + size;
-		state->ref_frame.cr = state->ref_frame.cb + size / chroma_div;
-	} else {
-		state->ref_frame.cb = NULL;
-		state->ref_frame.cr = NULL;
-	}
 
-	if (info->id == V4L2_PIX_FMT_FWHT || info->components_num == 4)
-		state->ref_frame.alpha =
-			state->ref_frame.cr + size / chroma_div;
-	else
-		state->ref_frame.alpha = NULL;
+		state->ref_frame.luma = kvmalloc(total_planes_size, GFP_KERNEL);
+		ctx->comp_max_size = total_planes_size;
+		new_comp_frame = kvmalloc(ctx->comp_max_size, GFP_KERNEL);
 
-	ctx->last_src_buf = NULL;
-	ctx->last_dst_buf = NULL;
-	state->gop_cnt = 0;
-	ctx->cur_buf_offset = 0;
-	ctx->comp_size = 0;
-	ctx->header_size = 0;
-	ctx->comp_magic_cnt = 0;
-	ctx->comp_has_frame = false;
+		if (!state->ref_frame.luma || !new_comp_frame) {
+			kvfree(state->ref_frame.luma);
+			kvfree(new_comp_frame);
+			vicodec_return_bufs(q, VB2_BUF_STATE_QUEUED);
+			return -ENOMEM;
+		}
+		/*
+		 * if state->compressed_frame was already allocated then
+		 * it contain data of the first frame of the new resolution
+		 */
+		if (state->compressed_frame) {
+			if (ctx->comp_size > ctx->comp_max_size) {
+				ctx->comp_size = ctx->comp_max_size;
+				ctx->comp_frame_size = ctx->comp_max_size;
+			}
+			memcpy(new_comp_frame,
+			       state->compressed_frame, ctx->comp_size);
+		}
+
+		kvfree(state->compressed_frame);
+		state->compressed_frame = new_comp_frame;
+
+		if (info->components_num >= 3) {
+			state->ref_frame.cb = state->ref_frame.luma + size;
+			state->ref_frame.cr = state->ref_frame.cb + size / chroma_div;
+		} else {
+			state->ref_frame.cb = NULL;
+			state->ref_frame.cr = NULL;
+		}
 
+		if (info->components_num == 4)
+			state->ref_frame.alpha =
+				state->ref_frame.cr + size / chroma_div;
+		else
+			state->ref_frame.alpha = NULL;
+	}
 	return 0;
 }
 
@@ -1163,11 +1379,21 @@ static void vicodec_stop_streaming(struct vb2_queue *q)
 
 	vicodec_return_bufs(q, VB2_BUF_STATE_ERROR);
 
-	if (!V4L2_TYPE_IS_OUTPUT(q->type))
-		return;
-
-	kvfree(ctx->state.ref_frame.luma);
-	kvfree(ctx->state.compressed_frame);
+	if ((!V4L2_TYPE_IS_OUTPUT(q->type) && !ctx->is_enc) ||
+	    (V4L2_TYPE_IS_OUTPUT(q->type) && ctx->is_enc)) {
+		kvfree(ctx->state.ref_frame.luma);
+		ctx->source_changed = false;
+	}
+	if (V4L2_TYPE_IS_OUTPUT(q->type) && !ctx->is_enc) {
+		ctx->cur_buf_offset = 0;
+		ctx->comp_max_size = 0;
+		ctx->comp_size = 0;
+		ctx->header_size = 0;
+		ctx->comp_magic_cnt = 0;
+		ctx->comp_frame_size = 0;
+		ctx->comp_has_frame = 0;
+		ctx->comp_has_next_frame = 0;
+	}
 }
 
 static const struct vb2_ops vicodec_qops = {
@@ -1319,16 +1545,17 @@ static int vicodec_open(struct file *file)
 	else
 		ctx->q_data[V4L2_M2M_SRC].sizeimage =
 			size + sizeof(struct fwht_cframe_hdr);
-	ctx->q_data[V4L2_M2M_DST] = ctx->q_data[V4L2_M2M_SRC];
-	ctx->q_data[V4L2_M2M_DST].info =
-		ctx->is_enc ? &pixfmt_fwht : v4l2_fwht_get_pixfmt(0);
-	size = 1280 * 720 * ctx->q_data[V4L2_M2M_DST].info->sizeimage_mult /
-		ctx->q_data[V4L2_M2M_DST].info->sizeimage_div;
-	if (ctx->is_enc)
-		ctx->q_data[V4L2_M2M_DST].sizeimage =
-			size + sizeof(struct fwht_cframe_hdr);
-	else
-		ctx->q_data[V4L2_M2M_DST].sizeimage = size;
+	if (ctx->is_enc) {
+		ctx->q_data[V4L2_M2M_DST] = ctx->q_data[V4L2_M2M_SRC];
+		ctx->q_data[V4L2_M2M_DST].info = &pixfmt_fwht;
+		ctx->q_data[V4L2_M2M_DST].sizeimage = 1280 * 720 *
+			ctx->q_data[V4L2_M2M_DST].info->sizeimage_mult /
+			ctx->q_data[V4L2_M2M_DST].info->sizeimage_div +
+			sizeof(struct fwht_cframe_hdr);
+	} else {
+		ctx->q_data[V4L2_M2M_DST].info = NULL;
+	}
+
 	ctx->state.colorspace = V4L2_COLORSPACE_REC709;
 
 	if (ctx->is_enc) {
-- 
2.17.1