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-rw-r--r--drivers/media/video/gspca/sonixb.c160
1 files changed, 106 insertions, 54 deletions
diff --git a/drivers/media/video/gspca/sonixb.c b/drivers/media/video/gspca/sonixb.c
index bfbd8c17d28b..f47a82902fa3 100644
--- a/drivers/media/video/gspca/sonixb.c
+++ b/drivers/media/video/gspca/sonixb.c
@@ -56,6 +56,8 @@ struct sd {
int prev_avg_lum;
int exp_too_low_cnt;
int exp_too_high_cnt;
+ int header_read;
+ u8 header[12]; /* Header without sof marker */
unsigned short exposure;
unsigned char gain;
@@ -1177,13 +1179,10 @@ static void sd_stopN(struct gspca_dev *gspca_dev)
sd_init(gspca_dev);
}
-static void sd_pkt_scan(struct gspca_dev *gspca_dev,
- u8 *data, /* isoc packet */
- int len) /* iso packet length */
+static u8* find_sof(struct gspca_dev *gspca_dev, u8 *data, int len)
{
- int i;
struct sd *sd = (struct sd *) gspca_dev;
- struct cam *cam = &gspca_dev->cam;
+ int i, header_size = (sd->bridge == BRIDGE_103) ? 18 : 12;
/* frames start with:
* ff ff 00 c4 c4 96 synchro
@@ -1194,58 +1193,84 @@ static void sd_pkt_scan(struct gspca_dev *gspca_dev,
* ll mm brightness sum outside auto exposure
* (xx xx xx xx xx) audio values for snc103
*/
- if (len > 6 && len < 24) {
- for (i = 0; i < len - 6; i++) {
- if (data[0 + i] == 0xff
- && data[1 + i] == 0xff
- && data[2 + i] == 0x00
- && data[3 + i] == 0xc4
- && data[4 + i] == 0xc4
- && data[5 + i] == 0x96) { /* start of frame */
- int lum = -1;
- int pkt_type = LAST_PACKET;
- int fr_h_sz = (sd->bridge == BRIDGE_103) ?
- 18 : 12;
-
- if (len - i < fr_h_sz) {
- PDEBUG(D_STREAM, "packet too short to"
- " get avg brightness");
- } else if (sd->bridge == BRIDGE_103) {
- lum = data[i + 9] +
- (data[i + 10] << 8);
- } else {
- lum = data[i + 8] + (data[i + 9] << 8);
- }
- /* When exposure changes midway a frame we
- get a lum of 0 in this case drop 2 frames
- as the frames directly after an exposure
- change have an unstable image. Sometimes lum
- *really* is 0 (cam used in low light with
- low exposure setting), so do not drop frames
- if the previous lum was 0 too. */
- if (lum == 0 && sd->prev_avg_lum != 0) {
- lum = -1;
- sd->frames_to_drop = 2;
- sd->prev_avg_lum = 0;
- } else
- sd->prev_avg_lum = lum;
- atomic_set(&sd->avg_lum, lum);
-
- if (sd->frames_to_drop) {
- sd->frames_to_drop--;
- pkt_type = DISCARD_PACKET;
- }
-
- gspca_frame_add(gspca_dev, pkt_type,
- NULL, 0);
- data += i + fr_h_sz;
- len -= i + fr_h_sz;
- gspca_frame_add(gspca_dev, FIRST_PACKET,
- data, len);
- return;
+ for (i = 0; i < len; i++) {
+ switch (sd->header_read) {
+ case 0:
+ if (data[i] == 0xff)
+ sd->header_read++;
+ break;
+ case 1:
+ if (data[i] == 0xff)
+ sd->header_read++;
+ else
+ sd->header_read = 0;
+ break;
+ case 2:
+ if (data[i] == 0x00)
+ sd->header_read++;
+ else if (data[i] != 0xff)
+ sd->header_read = 0;
+ break;
+ case 3:
+ if (data[i] == 0xc4)
+ sd->header_read++;
+ else if (data[i] == 0xff)
+ sd->header_read = 1;
+ else
+ sd->header_read = 0;
+ break;
+ case 4:
+ if (data[i] == 0xc4)
+ sd->header_read++;
+ else if (data[i] == 0xff)
+ sd->header_read = 1;
+ else
+ sd->header_read = 0;
+ break;
+ case 5:
+ if (data[i] == 0x96)
+ sd->header_read++;
+ else if (data[i] == 0xff)
+ sd->header_read = 1;
+ else
+ sd->header_read = 0;
+ break;
+ default:
+ sd->header[sd->header_read - 6] = data[i];
+ sd->header_read++;
+ if (sd->header_read == header_size) {
+ sd->header_read = 0;
+ return data + i + 1;
}
}
}
+ return NULL;
+}
+
+static void sd_pkt_scan(struct gspca_dev *gspca_dev,
+ u8 *data, /* isoc packet */
+ int len) /* iso packet length */
+{
+ int fr_h_sz = 0, lum_offset = 0, len_after_sof = 0;
+ struct sd *sd = (struct sd *) gspca_dev;
+ struct cam *cam = &gspca_dev->cam;
+ u8 *sof;
+
+ sof = find_sof(gspca_dev, data, len);
+ if (sof) {
+ if (sd->bridge == BRIDGE_103) {
+ fr_h_sz = 18;
+ lum_offset = 3;
+ } else {
+ fr_h_sz = 12;
+ lum_offset = 2;
+ }
+
+ len_after_sof = len - (sof - data);
+ len = (sof - data) - fr_h_sz;
+ if (len < 0)
+ len = 0;
+ }
if (cam->cam_mode[gspca_dev->curr_mode].priv & MODE_RAW) {
/* In raw mode we sometimes get some garbage after the frame
@@ -1259,6 +1284,33 @@ static void sd_pkt_scan(struct gspca_dev *gspca_dev,
}
gspca_frame_add(gspca_dev, INTER_PACKET, data, len);
+
+ if (sof) {
+ int lum = sd->header[lum_offset] +
+ (sd->header[lum_offset + 1] << 8);
+
+ /* When exposure changes midway a frame we
+ get a lum of 0 in this case drop 2 frames
+ as the frames directly after an exposure
+ change have an unstable image. Sometimes lum
+ *really* is 0 (cam used in low light with
+ low exposure setting), so do not drop frames
+ if the previous lum was 0 too. */
+ if (lum == 0 && sd->prev_avg_lum != 0) {
+ lum = -1;
+ sd->frames_to_drop = 2;
+ sd->prev_avg_lum = 0;
+ } else
+ sd->prev_avg_lum = lum;
+ atomic_set(&sd->avg_lum, lum);
+
+ if (sd->frames_to_drop)
+ sd->frames_to_drop--;
+ else
+ gspca_frame_add(gspca_dev, LAST_PACKET, NULL, 0);
+
+ gspca_frame_add(gspca_dev, FIRST_PACKET, sof, len_after_sof);
+ }
}
static int sd_setbrightness(struct gspca_dev *gspca_dev, __s32 val)