From b96cfc33e74f5ee5a206b2d43bf0bc3898c5a572 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Jean-Fran=C3=A7ois=20Moine?= Date: Thu, 10 Feb 2011 07:38:58 -0300 Subject: [PATCH] [media] gspca - sonixj: Update the JPEG quality for best image transfer MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit During image capture, the filling rate of the isoc packets is computed. It is then used by a work queue to update the current JPEG quality. Tested-by: Franck Bourdonnec Signed-off-by: Jean-François Moine Signed-off-by: Mauro Carvalho Chehab --- drivers/media/video/gspca/sonixj.c | 109 +++++++++++++++++++++++------ 1 file changed, 86 insertions(+), 23 deletions(-) diff --git a/drivers/media/video/gspca/sonixj.c b/drivers/media/video/gspca/sonixj.c index d465022b8022..2bfb8df9168b 100644 --- a/drivers/media/video/gspca/sonixj.c +++ b/drivers/media/video/gspca/sonixj.c @@ -57,12 +57,18 @@ struct sd { atomic_t avg_lum; u32 exposure; + struct work_struct work; + struct workqueue_struct *work_thread; + + u32 pktsz; /* (used by pkt_scan) */ + u16 npkt; + u8 nchg; s8 short_mark; u8 quality; /* image quality */ -#define QUALITY_MIN 60 -#define QUALITY_MAX 95 -#define QUALITY_DEF 80 +#define QUALITY_MIN 25 +#define QUALITY_MAX 90 +#define QUALITY_DEF 70 u8 reg01; u8 reg17; @@ -100,6 +106,8 @@ enum sensors { SENSOR_SP80708, }; +static void qual_upd(struct work_struct *work); + /* device flags */ #define F_PDN_INV 0x01 /* inverse pin S_PWR_DN / sn_xxx tables */ #define F_ILLUM 0x02 /* presence of illuminator */ @@ -1786,6 +1794,8 @@ static int sd_config(struct gspca_dev *gspca_dev, sd->ag_cnt = -1; sd->quality = QUALITY_DEF; + INIT_WORK(&sd->work, qual_upd); + return 0; } @@ -2297,6 +2307,19 @@ static void setjpegqual(struct gspca_dev *gspca_dev) reg_w1(gspca_dev, 0x18, sd->reg18); } +/* JPEG quality update */ +/* This function is executed from a work queue. */ +static void qual_upd(struct work_struct *work) +{ + struct sd *sd = container_of(work, struct sd, work); + struct gspca_dev *gspca_dev = &sd->gspca_dev; + + mutex_lock(&gspca_dev->usb_lock); + PDEBUG(D_STREAM, "qual_upd %d%%", sd->quality); + setjpegqual(gspca_dev); + mutex_unlock(&gspca_dev->usb_lock); +} + /* -- start the camera -- */ static int sd_start(struct gspca_dev *gspca_dev) { @@ -2610,6 +2633,11 @@ static int sd_start(struct gspca_dev *gspca_dev) setcolors(gspca_dev); setautogain(gspca_dev); setfreq(gspca_dev); + + sd->pktsz = sd->npkt = 0; + sd->nchg = sd->short_mark = 0; + sd->work_thread = create_singlethread_workqueue(MODULE_NAME); + return gspca_dev->usb_err; } @@ -2686,6 +2714,20 @@ static void sd_stopN(struct gspca_dev *gspca_dev) /* reg_w1(gspca_dev, 0xf1, 0x01); */ } +/* called on streamoff with alt==0 and on disconnect */ +/* the usb_lock is held at entry - restore on exit */ +static void sd_stop0(struct gspca_dev *gspca_dev) +{ + struct sd *sd = (struct sd *) gspca_dev; + + if (sd->work_thread != NULL) { + mutex_unlock(&gspca_dev->usb_lock); + destroy_workqueue(sd->work_thread); + mutex_lock(&gspca_dev->usb_lock); + sd->work_thread = NULL; + } +} + static void do_autogain(struct gspca_dev *gspca_dev) { struct sd *sd = (struct sd *) gspca_dev; @@ -2778,7 +2820,7 @@ static void sd_pkt_scan(struct gspca_dev *gspca_dev, int len) /* iso packet length */ { struct sd *sd = (struct sd *) gspca_dev; - int i; + int i, new_qual; /* * A frame ends on the marker @@ -2818,6 +2860,10 @@ static void sd_pkt_scan(struct gspca_dev *gspca_dev, data += i; } + /* count the packets and their size */ + sd->npkt++; + sd->pktsz += len; + /* search backwards if there is a marker in the packet */ for (i = len - 1; --i >= 0; ) { if (data[i] != 0xff) { @@ -2843,27 +2889,60 @@ static void sd_pkt_scan(struct gspca_dev *gspca_dev, return; /* marker found */ - /* if some error, discard the frame */ + /* if some error, discard the frame and decrease the quality */ marker_found: + new_qual = 0; if (i > 2) { if (data[i - 2] != 0xff || data[i - 1] != 0xd9) { gspca_dev->last_packet_type = DISCARD_PACKET; + new_qual = -3; } } else if (i + 6 < len) { if (data[i + 6] & 0x08) { gspca_dev->last_packet_type = DISCARD_PACKET; + new_qual = -5; } } gspca_frame_add(gspca_dev, LAST_PACKET, data, i); + /* compute the filling rate and a new JPEG quality */ + if (new_qual == 0) { + int r; + + r = (sd->pktsz * 100) / + (sd->npkt * + gspca_dev->urb[0]->iso_frame_desc[0].length); + if (r >= 85) + new_qual = -3; + else if (r < 75) + new_qual = 2; + } + if (new_qual != 0) { + sd->nchg += new_qual; + if (sd->nchg < -6 || sd->nchg >= 12) { + sd->nchg = 0; + new_qual += sd->quality; + if (new_qual < QUALITY_MIN) + new_qual = QUALITY_MIN; + else if (new_qual > QUALITY_MAX) + new_qual = QUALITY_MAX; + if (new_qual != sd->quality) { + sd->quality = new_qual; + queue_work(sd->work_thread, &sd->work); + } + } + } else { + sd->nchg = 0; + } + sd->pktsz = sd->npkt = 0; + /* if the marker is smaller than 62 bytes, * memorize the number of bytes to skip in the next packet */ if (i + 62 > len) { /* no more usable data */ sd->short_mark = i + 62 - len; return; } - if (sd->ag_cnt >= 0) set_lum(sd, data + i); @@ -2878,22 +2957,6 @@ marker_found: } } -static int sd_set_jcomp(struct gspca_dev *gspca_dev, - struct v4l2_jpegcompression *jcomp) -{ - struct sd *sd = (struct sd *) gspca_dev; - - if (jcomp->quality < QUALITY_MIN) - sd->quality = QUALITY_MIN; - else if (jcomp->quality > QUALITY_MAX) - sd->quality = QUALITY_MAX; - else - sd->quality = jcomp->quality; - if (gspca_dev->streaming) - setjpegqual(gspca_dev); - return 0; -} - static int sd_get_jcomp(struct gspca_dev *gspca_dev, struct v4l2_jpegcompression *jcomp) { @@ -2955,10 +3018,10 @@ static const struct sd_desc sd_desc = { .init = sd_init, .start = sd_start, .stopN = sd_stopN, + .stop0 = sd_stop0, .pkt_scan = sd_pkt_scan, .dq_callback = do_autogain, .get_jcomp = sd_get_jcomp, - .set_jcomp = sd_set_jcomp, .querymenu = sd_querymenu, #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE) .int_pkt_scan = sd_int_pkt_scan, -- 2.20.1