From 0455eebfbd6c286552f9d98bdc6614dfbdd63682 Mon Sep 17 00:00:00 2001 From: Frank Schaefer Date: Sun, 25 Nov 2012 06:37:34 -0300 Subject: [PATCH] [media] em28xx: fix capture type setting in em28xx_urb_data_copy_vbi() MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Set capture type to 1 (video start) when the video frame start header is detected. This bug didn't cause any trouble, because this type of header is never received in vbi mode. Fix it, because we want to use this function with disabled vbi in the future. Also start with capture type -1 to avoid processing of corrupted/incomplete frame data which is usually received at streaming start (especially when USB bulk transfers are used). Signed-off-by: Frank Schäfer Signed-off-by: Mauro Carvalho Chehab --- drivers/media/usb/em28xx/em28xx-video.c | 26 ++++++++++---------------- drivers/media/usb/em28xx/em28xx.h | 2 +- 2 files changed, 11 insertions(+), 17 deletions(-) diff --git a/drivers/media/usb/em28xx/em28xx-video.c b/drivers/media/usb/em28xx/em28xx-video.c index da31fd495466..d4f230002747 100644 --- a/drivers/media/usb/em28xx/em28xx-video.c +++ b/drivers/media/usb/em28xx/em28xx-video.c @@ -593,7 +593,7 @@ static inline int em28xx_urb_data_copy_vbi(struct em28xx *dev, struct urb *urb) dev->capture_type = 0; dev->vbi_read = 0; em28xx_isocdbg("VBI START HEADER!!!\n"); - dev->cur_field = p[2]; + dev->top_field = !(p[2] & 1); p += 4; len -= 4; } else if (p[0] == 0x88 && p[1] == 0x88 && @@ -603,6 +603,8 @@ static inline int em28xx_urb_data_copy_vbi(struct em28xx *dev, struct urb *urb) len -= 4; } else if (p[0] == 0x22 && p[1] == 0x5a) { /* start video */ + dev->capture_type = 1; + dev->top_field = !(p[2] & 1); p += 4; len -= 4; } @@ -619,8 +621,7 @@ static inline int em28xx_urb_data_copy_vbi(struct em28xx *dev, struct urb *urb) em28xx_isocdbg("dev->vbi_read > vbi_size\n"); } else if ((dev->vbi_read + len) < vbi_size) { /* This entire frame is VBI data */ - if (dev->vbi_read == 0 && - (!(dev->cur_field & 1))) { + if (dev->vbi_read == 0 && dev->top_field) { /* Brand new frame */ if (vbi_buf != NULL) vbi_buffer_filled(dev, @@ -636,12 +637,8 @@ static inline int em28xx_urb_data_copy_vbi(struct em28xx *dev, struct urb *urb) if (dev->vbi_read == 0) { vbi_dma_q->pos = 0; - if (vbi_buf != NULL) { - if (dev->cur_field & 1) - vbi_buf->top_field = 0; - else - vbi_buf->top_field = 1; - } + if (vbi_buf != NULL) + vbi_buf->top_field = dev->top_field; } dev->vbi_read += len; @@ -662,7 +659,7 @@ static inline int em28xx_urb_data_copy_vbi(struct em28xx *dev, struct urb *urb) if (dev->capture_type == 1) { dev->capture_type = 2; - if (dev->progressive || !(dev->cur_field & 1)) { + if (dev->progressive || dev->top_field) { if (buf != NULL) buffer_filled(dev, dma_q, buf); get_next_buf(dma_q, &buf); @@ -671,12 +668,8 @@ static inline int em28xx_urb_data_copy_vbi(struct em28xx *dev, struct urb *urb) else outp = videobuf_to_vmalloc(&buf->vb); } - if (buf != NULL) { - if (dev->cur_field & 1) - buf->top_field = 0; - else - buf->top_field = 1; - } + if (buf != NULL) + buf->top_field = dev->top_field; dma_q->pos = 0; } @@ -774,6 +767,7 @@ buffer_prepare(struct videobuf_queue *vq, struct videobuf_buffer *vb, urb_init = 1; if (urb_init) { + dev->capture_type = -1; if (em28xx_vbi_supported(dev) == 1) rc = em28xx_init_usb_xfer(dev, EM28XX_ANALOG_MODE, dev->analog_xfer_bulk, diff --git a/drivers/media/usb/em28xx/em28xx.h b/drivers/media/usb/em28xx/em28xx.h index aa413bd76dec..09df56a4570c 100644 --- a/drivers/media/usb/em28xx/em28xx.h +++ b/drivers/media/usb/em28xx/em28xx.h @@ -563,7 +563,7 @@ struct em28xx { /* vbi related state tracking */ int capture_type; int vbi_read; - unsigned char cur_field; + unsigned char top_field:1; unsigned int vbi_width; unsigned int vbi_height; /* lines per field */ -- 2.11.0