V4L/DVB (10445): cx18: Process Raw VBI on a whole frame basis; fix VBI buffer size

The cx23418 appears to send Raw VBI buffers with a PTS on a per frame
basis, not per field, so process Raw VBI on a whole frame basis and reduce
some complexity.  Fix VBI buffer size computation to handle a whole
frame of Raw VBI for a 625 line system, which is the worst case and will
work for 525 lines systems as well.
Signed-off-by: Andy Walls <awalls@radix.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/cx18/cx18-driver.c

@@ -448,34 +448,38 @@ static void cx18_process_options(struct cx18 *cx)
 	cx->stream_buf_size[CX18_ENC_STREAM_TYPE_MPG] = enc_mpg_bufsize;
 	cx->stream_buf_size[CX18_ENC_STREAM_TYPE_IDX] = enc_idx_bufsize;
 	cx->stream_buf_size[CX18_ENC_STREAM_TYPE_YUV] = enc_yuv_bufsize;
-	cx->stream_buf_size[CX18_ENC_STREAM_TYPE_VBI] = 0; /* computed later */
+	cx->stream_buf_size[CX18_ENC_STREAM_TYPE_VBI] = vbi_active_samples * 36;
 	cx->stream_buf_size[CX18_ENC_STREAM_TYPE_PCM] = enc_pcm_bufsize;
 	cx->stream_buf_size[CX18_ENC_STREAM_TYPE_RAD] = 0; /* control no data */
 
-	/* Except for VBI ensure stream_buffers & stream_buf_size are valid */
+	/* Ensure stream_buffers & stream_buf_size are valid */
 	for (i = 0; i < CX18_MAX_STREAMS; i++) {
-		/* User said to use 0 buffers */
-		if (cx->stream_buffers[i] == 0) {
-			cx->options.megabytes[i] = 0;
-			cx->stream_buf_size[i] = 0;
-			continue;
-		}
-		/* User said to use 0 MB total */
-		if (cx->options.megabytes[i] <= 0) {
+		if (cx->stream_buffers[i] == 0 ||     /* User said 0 buffers */
+		    cx->options.megabytes[i] <= 0 ||  /* User said 0 MB total */
+		    cx->stream_buf_size[i] <= 0) {    /* User said buf size 0 */
 			cx->options.megabytes[i] = 0;
 			cx->stream_buffers[i] = 0;
 			cx->stream_buf_size[i] = 0;
 			continue;
 		}
-		/* VBI is computed later or user said buffer has size 0 */
-		if (cx->stream_buf_size[i] <= 0) {
-			if (i != CX18_ENC_STREAM_TYPE_VBI) {
-				cx->options.megabytes[i] = 0;
-				cx->stream_buffers[i] = 0;
-				cx->stream_buf_size[i] = 0;
+		/*
+		 * VBI is a special case where the stream_buf_size is fixed
+		 * and already in bytes
+		 */
+		if (i == CX18_ENC_STREAM_TYPE_VBI) {
+			if (cx->stream_buffers[i] < 0) {
+				cx->stream_buffers[i] =
+					cx->options.megabytes[i] * 1024 * 1024
+					/ cx->stream_buf_size[i];
+			} else {
+				/* N.B. This might round down to 0 */
+				cx->options.megabytes[i] =
+					cx->stream_buffers[i]
+					* cx->stream_buf_size[i]/(1024 * 1024);
 			}
 			continue;
 		}
+		/* All other streams have stream_buf_size in kB at this point */
 		if (cx->stream_buffers[i] < 0) {
 			cx->stream_buffers[i] = cx->options.megabytes[i] * 1024
 						/ cx->stream_buf_size[i];
@@ -732,7 +736,6 @@ static int __devinit cx18_probe(struct pci_dev *pci_dev,
 {
 	int retval = 0;
 	int i;
-	int vbi_buf_size;
 	u32 devtype;
 	struct cx18 *cx;
 
@@ -888,23 +891,6 @@ static int __devinit cx18_probe(struct pci_dev *pci_dev,
 	}
 	cx->params.video_gop_size = cx->is_60hz ? 15 : 12;
 
-	/*
-	 * FIXME: setting the buffer size based on the tuner standard is
-	 * suboptimal, as the CVBS and SVideo inputs could use a different std
-	 * and the buffer could end up being too small in that case.
-	 */
-	vbi_buf_size = vbi_active_samples * (cx->is_60hz ? 24 : 36) / 2;
-	cx->stream_buf_size[CX18_ENC_STREAM_TYPE_VBI] = vbi_buf_size;
-
-	if (cx->stream_buffers[CX18_ENC_STREAM_TYPE_VBI] < 0)
-		cx->stream_buffers[CX18_ENC_STREAM_TYPE_VBI] =
-		   cx->options.megabytes[CX18_ENC_STREAM_TYPE_VBI] * 1024 * 1024
-		   / vbi_buf_size;
-	else
-		cx->options.megabytes[CX18_ENC_STREAM_TYPE_VBI] =
-		     cx->stream_buffers[CX18_ENC_STREAM_TYPE_VBI] * vbi_buf_size
-		     / (1024 * 1024);
-
 	if (cx->options.radio > 0)
 		cx->v4l2_cap |= V4L2_CAP_RADIO;
 

drivers/media/video/cx18/cx18-vbi.c

@@ -103,12 +103,11 @@ static void copy_vbi_data(struct cx18 *cx, int lines, u32 pts_stamp)
 }
 
 /* Compress raw VBI format, removes leading SAV codes and surplus space
-   after the field.
-   Returns new compressed size. */
+   after the frame.  Returns new compressed size. */
 static u32 compress_raw_buf(struct cx18 *cx, u8 *buf, u32 size)
 {
 	u32 line_size = vbi_active_samples;
-	u32 lines = cx->vbi.count;
+	u32 lines = cx->vbi.count * 2;
 	u8 sav1 = raw_vbi_sav_rp[0];
 	u8 sav2 = raw_vbi_sav_rp[1];
 	u8 *q = buf;
@@ -195,30 +194,26 @@ void cx18_process_vbi_data(struct cx18 *cx, struct cx18_buffer *buf,
 		u8 type;
 
 		/*
-		 * We've set up to get a field's worth of VBI data at a time.
-		 * Skip 12 bytes of header prefixing the first field or the
-		 * last 12 bytes in the last VBI line from the first field that
-		 * prefixes the second field.
+		 * We've set up to get a frame's worth of VBI data at a time.
+		 * Skip 12 bytes of header prefixing the first field.
 		 */
 		size -= 12;
 		memcpy(p, &buf->buf[12], size);
 		type = p[3];
 
-		/* Extrapolate the last 12 bytes of the field's last line */
+		/* Extrapolate the last 12 bytes of the frame's last line */
 		memset(&p[size], (int) p[size - 1], 12);
+		size += 12;
 
 		size = buf->bytesused = compress_raw_buf(cx, p, size);
 
-		if (type == raw_vbi_sav_rp[1]) {
 		/*
 		 * Hack needed for compatibility with old VBI software.
-			 * Write the frame # at the end of the last line of the
-			 * second field
+		 * Write the frame # at the last 4 bytes of the frame
 		 */
 		p += size - 4;
 		memcpy(p, &cx->vbi.frame, 4);
 		cx->vbi.frame++;
-		}
 		return;
 	}