From 466df46484aced005fa41706f87e18eaa86918ad Mon Sep 17 00:00:00 2001 From: Andy Walls Date: Sat, 7 Feb 2009 15:47:28 -0300 Subject: 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 Signed-off-by: Mauro Carvalho Chehab --- drivers/media/video/cx18/cx18-driver.c | 54 +++++++++++++--------------------- 1 file changed, 20 insertions(+), 34 deletions(-) (limited to 'drivers/media/video/cx18/cx18-driver.c') diff --git a/drivers/media/video/cx18/cx18-driver.c b/drivers/media/video/cx18/cx18-driver.c index 842ce636e45c..3cf8ddb633b4 100644 --- a/drivers/media/video/cx18/cx18-driver.c +++ b/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; -- cgit v1.2.3