diff options
Diffstat (limited to 'drivers/media/video/gspca/sonixb.c')
| -rw-r--r-- | drivers/media/video/gspca/sonixb.c | 160 |
1 files changed, 106 insertions, 54 deletions
diff --git a/drivers/media/video/gspca/sonixb.c b/drivers/media/video/gspca/sonixb.c index bfbd8c1..f47a829 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) |