diff options
Diffstat (limited to 'drivers/media/video/gspca/sonixj.c')
| -rw-r--r-- | drivers/media/video/gspca/sonixj.c | 62 |
1 files changed, 38 insertions, 24 deletions
diff --git a/drivers/media/video/gspca/sonixj.c b/drivers/media/video/gspca/sonixj.c index 3c699ac..72f830a 100644 --- a/drivers/media/video/gspca/sonixj.c +++ b/drivers/media/video/gspca/sonixj.c @@ -2820,38 +2820,52 @@ static void sd_pkt_scan(struct gspca_dev *gspca_dev, struct sd *sd = (struct sd *) gspca_dev; int sof, avg_lum; - sof = len - 64; - if (sof >= 0 && data[sof] == 0xff && data[sof + 1] == 0xd9) { - - /* end of frame */ - gspca_frame_add(gspca_dev, LAST_PACKET, - data, sof + 2); - if (sd->ag_cnt < 0) - return; + /* the image ends on a 64 bytes block starting with + * ff d9 ff ff 00 c4 c4 96 + * and followed by various information including luminosity */ + /* this block may be splitted between two packets */ + /* a new image always starts in a new packet */ + switch (gspca_dev->last_packet_type) { + case DISCARD_PACKET: /* restart image building */ + sof = len - 64; + if (sof >= 0 && data[sof] == 0xff && data[sof + 1] == 0xd9) + gspca_frame_add(gspca_dev, LAST_PACKET, NULL, 0); + return; + case LAST_PACKET: /* put the JPEG 422 header */ + gspca_frame_add(gspca_dev, FIRST_PACKET, + sd->jpeg_hdr, JPEG_HDR_SZ); + break; + } + gspca_frame_add(gspca_dev, INTER_PACKET, data, len); + + data = gspca_dev->image; + if (data == NULL) + return; + sof = gspca_dev->image_len - 64; + if (data[sof] != 0xff + || data[sof + 1] != 0xd9) + return; + + /* end of image found - remove the trailing data */ + gspca_dev->image_len = sof + 2; + gspca_frame_add(gspca_dev, LAST_PACKET, NULL, 0); + if (sd->ag_cnt < 0) + return; /* w1 w2 w3 */ /* w4 w5 w6 */ /* w7 w8 */ /* w4 */ - avg_lum = ((data[sof + 29] << 8) | data[sof + 30]) >> 6; + avg_lum = ((data[sof + 29] << 8) | data[sof + 30]) >> 6; /* w6 */ - avg_lum += ((data[sof + 33] << 8) | data[sof + 34]) >> 6; + avg_lum += ((data[sof + 33] << 8) | data[sof + 34]) >> 6; /* w2 */ - avg_lum += ((data[sof + 25] << 8) | data[sof + 26]) >> 6; + avg_lum += ((data[sof + 25] << 8) | data[sof + 26]) >> 6; /* w8 */ - avg_lum += ((data[sof + 37] << 8) | data[sof + 38]) >> 6; + avg_lum += ((data[sof + 37] << 8) | data[sof + 38]) >> 6; /* w5 */ - avg_lum += ((data[sof + 31] << 8) | data[sof + 32]) >> 4; - avg_lum >>= 4; - atomic_set(&sd->avg_lum, avg_lum); - return; - } - if (gspca_dev->last_packet_type == LAST_PACKET) { - - /* put the JPEG 422 header */ - gspca_frame_add(gspca_dev, FIRST_PACKET, - sd->jpeg_hdr, JPEG_HDR_SZ); - } - gspca_frame_add(gspca_dev, INTER_PACKET, data, len); + avg_lum += ((data[sof + 31] << 8) | data[sof + 32]) >> 4; + avg_lum >>= 4; + atomic_set(&sd->avg_lum, avg_lum); } static int sd_setbrightness(struct gspca_dev *gspca_dev, __s32 val) |