diff options
-rw-r--r-- | drivers/media/video/gspca/coarse_expo_autogain.h | 116 | ||||
-rw-r--r-- | drivers/media/video/gspca/gspca.c | 2 | ||||
-rw-r--r-- | drivers/media/video/gspca/sonixb.c | 113 |
3 files changed, 193 insertions, 38 deletions
diff --git a/drivers/media/video/gspca/coarse_expo_autogain.h b/drivers/media/video/gspca/coarse_expo_autogain.h new file mode 100644 index 0000000..1cb9d94 --- /dev/null +++ b/drivers/media/video/gspca/coarse_expo_autogain.h @@ -0,0 +1,116 @@ +/* + * Auto gain algorithm for camera's with a coarse exposure control + * + * Copyright (C) 2010 Hans de Goede <hdegoede@redhat.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +/* Autogain + exposure algorithm for cameras with a coarse exposure control + (usually this means we can only control the clockdiv to change exposure) + As changing the clockdiv so that the fps drops from 30 to 15 fps for + example, will lead to a huge exposure change (it effectively doubles), + this algorithm normally tries to only adjust the gain (between 40 and + 80 %) and if that does not help, only then changes exposure. This leads + to a much more stable image then using the knee algorithm which at + certain points of the knee graph will only try to adjust exposure, + which leads to oscilating as one exposure step is huge. + + Note this assumes that the sd struct for the cam in question has + exp_too_high_cnt and exp_too_high_cnt int members for use by this function. + + Returns 0 if no changes were made, 1 if the gain and or exposure settings + where changed. */ +static int gspca_coarse_grained_expo_autogain(struct gspca_dev *gspca_dev, + int avg_lum, int desired_avg_lum, int deadzone) +{ + int i, steps, gain, orig_gain, exposure, orig_exposure; + int gain_low, gain_high; + const struct ctrl *gain_ctrl = NULL; + const struct ctrl *exposure_ctrl = NULL; + struct sd *sd = (struct sd *) gspca_dev; + int retval = 0; + + for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) { + if (gspca_dev->ctrl_dis & (1 << i)) + continue; + if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_GAIN) + gain_ctrl = &gspca_dev->sd_desc->ctrls[i]; + if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_EXPOSURE) + exposure_ctrl = &gspca_dev->sd_desc->ctrls[i]; + } + if (!gain_ctrl || !exposure_ctrl) { + PDEBUG(D_ERR, "Error: gspca_coarse_grained_expo_autogain " + "called on cam without gain or exposure"); + return 0; + } + + if (gain_ctrl->get(gspca_dev, &gain) || + exposure_ctrl->get(gspca_dev, &exposure)) + return 0; + + orig_gain = gain; + orig_exposure = exposure; + gain_low = + (gain_ctrl->qctrl.maximum - gain_ctrl->qctrl.minimum) / 5 * 2; + gain_low += gain_ctrl->qctrl.minimum; + gain_high = + (gain_ctrl->qctrl.maximum - gain_ctrl->qctrl.minimum) / 5 * 4; + gain_high += gain_ctrl->qctrl.minimum; + + /* If we are of a multiple of deadzone, do multiple steps to reach the + desired lumination fast (with the risc of a slight overshoot) */ + steps = (desired_avg_lum - avg_lum) / deadzone; + + PDEBUG(D_FRAM, "autogain: lum: %d, desired: %d, steps: %d", + avg_lum, desired_avg_lum, steps); + + if ((gain + steps) > gain_high && + sd->exposure < exposure_ctrl->qctrl.maximum) { + gain = gain_high; + sd->exp_too_low_cnt++; + } else if ((gain + steps) < gain_low && + sd->exposure > exposure_ctrl->qctrl.minimum) { + gain = gain_low; + sd->exp_too_high_cnt++; + } else { + gain += steps; + if (gain > gain_ctrl->qctrl.maximum) + gain = gain_ctrl->qctrl.maximum; + else if (gain < gain_ctrl->qctrl.minimum) + gain = gain_ctrl->qctrl.minimum; + sd->exp_too_high_cnt = 0; + sd->exp_too_low_cnt = 0; + } + + if (sd->exp_too_high_cnt > 3) { + exposure--; + sd->exp_too_high_cnt = 0; + } else if (sd->exp_too_low_cnt > 3) { + exposure++; + sd->exp_too_low_cnt = 0; + } + + if (gain != orig_gain) { + gain_ctrl->set(gspca_dev, gain); + retval = 1; + } + if (exposure != orig_exposure) { + exposure_ctrl->set(gspca_dev, exposure); + retval = 1; + } + + return retval; +} diff --git a/drivers/media/video/gspca/gspca.c b/drivers/media/video/gspca/gspca.c index 96a7769..2c662ed 100644 --- a/drivers/media/video/gspca/gspca.c +++ b/drivers/media/video/gspca/gspca.c @@ -2417,6 +2417,8 @@ int gspca_auto_gain_n_exposure(struct gspca_dev *gspca_dev, int avg_lum, int retval = 0; for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) { + if (gspca_dev->ctrl_dis & (1 << i)) + continue; if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_GAIN) gain_ctrl = &gspca_dev->sd_desc->ctrls[i]; if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_EXPOSURE) diff --git a/drivers/media/video/gspca/sonixb.c b/drivers/media/video/gspca/sonixb.c index 4356423..dc2d88c 100644 --- a/drivers/media/video/gspca/sonixb.c +++ b/drivers/media/video/gspca/sonixb.c @@ -54,9 +54,11 @@ struct sd { struct gspca_dev gspca_dev; /* !! must be the first item */ atomic_t avg_lum; int prev_avg_lum; + int exp_too_low_cnt; + int exp_too_high_cnt; + unsigned short exposure; unsigned char gain; - unsigned char exposure; unsigned char brightness; unsigned char autogain; unsigned char autogain_ignore_frames; @@ -97,13 +99,15 @@ struct sensor_data { /* sensor_data flags */ #define F_GAIN 0x01 /* has gain */ #define F_SIF 0x02 /* sif or vga */ +#define F_COARSE_EXPO 0x04 /* exposure control is coarse */ /* priv field of struct v4l2_pix_format flags (do not use low nibble!) */ #define MODE_RAW 0x10 /* raw bayer mode */ #define MODE_REDUCED_SIF 0x20 /* vga mode (320x240 / 160x120) on sif cam */ /* ctrl_dis helper macros */ -#define NO_EXPO ((1 << EXPOSURE_IDX) | (1 << AUTOGAIN_IDX)) +#define NO_EXPO ((1 << EXPOSURE_IDX) | (1 << COARSE_EXPOSURE_IDX) | \ + (1 << AUTOGAIN_IDX)) #define NO_FREQ (1 << FREQ_IDX) #define NO_BRIGHTNESS (1 << BRIGHTNESS_IDX) @@ -129,11 +133,10 @@ struct sensor_data { } /* We calculate the autogain at the end of the transfer of a frame, at this - moment a frame with the old settings is being transmitted, and a frame is - being captured with the old settings. So if we adjust the autogain we must - ignore atleast the 2 next frames for the new settings to come into effect - before doing any other adjustments */ -#define AUTOGAIN_IGNORE_FRAMES 3 + moment a frame with the old settings is being captured and transmitted. So + if we adjust the gain or exposure we must ignore atleast the next frame for + the new settings to come into effect before doing any other adjustments. */ +#define AUTOGAIN_IGNORE_FRAMES 1 /* V4L2 controls supported by the driver */ static int sd_setbrightness(struct gspca_dev *gspca_dev, __s32 val); @@ -185,10 +188,10 @@ static const struct ctrl sd_ctrls[] = { .id = V4L2_CID_EXPOSURE, .type = V4L2_CTRL_TYPE_INTEGER, .name = "Exposure", -#define EXPOSURE_DEF 16 /* 32 ms / 30 fps */ -#define EXPOSURE_KNEE 50 /* 100 ms / 10 fps */ +#define EXPOSURE_DEF 33 /* 33 ms / 30 fps */ +#define EXPOSURE_KNEE 100 /* 100 ms / 10 fps */ .minimum = 0, - .maximum = 255, + .maximum = 511, .step = 1, .default_value = EXPOSURE_DEF, .flags = 0, @@ -196,7 +199,23 @@ static const struct ctrl sd_ctrls[] = { .set = sd_setexposure, .get = sd_getexposure, }, -#define AUTOGAIN_IDX 3 +#define COARSE_EXPOSURE_IDX 3 + { + { + .id = V4L2_CID_EXPOSURE, + .type = V4L2_CTRL_TYPE_INTEGER, + .name = "Exposure", +#define COARSE_EXPOSURE_DEF 2 /* 30 fps */ + .minimum = 2, + .maximum = 15, + .step = 1, + .default_value = COARSE_EXPOSURE_DEF, + .flags = 0, + }, + .set = sd_setexposure, + .get = sd_getexposure, + }, +#define AUTOGAIN_IDX 4 { { .id = V4L2_CID_AUTOGAIN, @@ -212,7 +231,7 @@ static const struct ctrl sd_ctrls[] = { .set = sd_setautogain, .get = sd_getautogain, }, -#define FREQ_IDX 4 +#define FREQ_IDX 5 { { .id = V4L2_CID_POWER_LINE_FREQUENCY, @@ -507,10 +526,10 @@ SENS(initPas106, NULL, pas106_sensor_init, NULL, NULL, F_SIF, NO_EXPO|NO_FREQ, 0), SENS(initPas202, initPas202, pas202_sensor_init, NULL, NULL, 0, NO_EXPO|NO_FREQ, 0), -SENS(initTas5110c, NULL, tas5110_sensor_init, NULL, NULL, F_GAIN|F_SIF, - NO_BRIGHTNESS|NO_FREQ, 0), -SENS(initTas5110d, NULL, tas5110_sensor_init, NULL, NULL, F_GAIN|F_SIF, - NO_BRIGHTNESS|NO_FREQ, 0), +SENS(initTas5110c, NULL, tas5110_sensor_init, NULL, NULL, + F_GAIN|F_SIF|F_COARSE_EXPO, NO_BRIGHTNESS|NO_FREQ, 0), +SENS(initTas5110d, NULL, tas5110_sensor_init, NULL, NULL, + F_GAIN|F_SIF|F_COARSE_EXPO, NO_BRIGHTNESS|NO_FREQ, 0), SENS(initTas5130, NULL, tas5130_sensor_init, NULL, NULL, 0, NO_EXPO|NO_FREQ, 0), }; @@ -721,16 +740,10 @@ static void setexposure(struct gspca_dev *gspca_dev) switch (sd->sensor) { case SENSOR_TAS5110C: case SENSOR_TAS5110D: { - __u8 reg; - /* register 19's high nibble contains the sn9c10x clock divider The high nibble configures the no fps according to the formula: 60 / high_nibble. With a maximum of 30 fps */ - reg = 120 * sd->exposure / 1000; - if (reg < 2) - reg = 2; - else if (reg > 15) - reg = 15; + __u8 reg = sd->exposure; reg = (reg << 4) | 0x0b; reg_w(gspca_dev, 0x19, ®, 1); break; @@ -766,7 +779,7 @@ static void setexposure(struct gspca_dev *gspca_dev) } else reg10_max = 0x41; - reg11 = (60 * sd->exposure + 999) / 1000; + reg11 = (30 * sd->exposure + 999) / 1000; if (reg11 < 1) reg11 = 1; else if (reg11 > 16) @@ -778,8 +791,8 @@ static void setexposure(struct gspca_dev *gspca_dev) reg11 = 3; /* frame exposure time in ms = 1000 * reg11 / 30 -> - reg10 = sd->exposure * 2 * reg10_max / (1000 * reg11 / 30) */ - reg10 = (sd->exposure * 60 * reg10_max) / (1000 * reg11); + reg10 = sd->exposure * reg10_max / (1000 * reg11 / 30) */ + reg10 = (sd->exposure * 30 * reg10_max) / (1000 * reg11); /* Don't allow this to get below 10 when using autogain, the steps become very large (relatively) when below 10 causing @@ -839,30 +852,43 @@ static void setfreq(struct gspca_dev *gspca_dev) } } +#include "coarse_expo_autogain.h" + static void do_autogain(struct gspca_dev *gspca_dev) { - int deadzone, desired_avg_lum; + int deadzone, desired_avg_lum, result; struct sd *sd = (struct sd *) gspca_dev; int avg_lum = atomic_read(&sd->avg_lum); - if (avg_lum == -1) + if (avg_lum == -1 || !sd->autogain) + return; + + if (sd->autogain_ignore_frames > 0) { + sd->autogain_ignore_frames--; return; + } /* SIF / VGA sensors have a different autoexposure area and thus different avg_lum values for the same picture brightness */ if (sensor_data[sd->sensor].flags & F_SIF) { - deadzone = 1000; - desired_avg_lum = 7000; + deadzone = 500; + /* SIF sensors tend to overexpose, so keep this small */ + desired_avg_lum = 5000; } else { - deadzone = 3000; + deadzone = 1500; desired_avg_lum = 23000; } - if (sd->autogain_ignore_frames > 0) - sd->autogain_ignore_frames--; - else if (gspca_auto_gain_n_exposure(gspca_dev, avg_lum, - sd->brightness * desired_avg_lum / 127, - deadzone, GAIN_KNEE, EXPOSURE_KNEE)) { + if (sensor_data[sd->sensor].flags & F_COARSE_EXPO) + result = gspca_coarse_grained_expo_autogain(gspca_dev, avg_lum, + sd->brightness * desired_avg_lum / 127, + deadzone); + else + result = gspca_auto_gain_n_exposure(gspca_dev, avg_lum, + sd->brightness * desired_avg_lum / 127, + deadzone, GAIN_KNEE, EXPOSURE_KNEE); + + if (result) { PDEBUG(D_FRAM, "autogain: gain changed: gain: %d expo: %d", (int)sd->gain, (int)sd->exposure); sd->autogain_ignore_frames = AUTOGAIN_IGNORE_FRAMES; @@ -897,7 +923,13 @@ static int sd_config(struct gspca_dev *gspca_dev, sd->brightness = BRIGHTNESS_DEF; sd->gain = GAIN_DEF; - sd->exposure = EXPOSURE_DEF; + if (sensor_data[sd->sensor].flags & F_COARSE_EXPO) { + sd->exposure = COARSE_EXPOSURE_DEF; + gspca_dev->ctrl_dis |= (1 << EXPOSURE_IDX); + } else { + sd->exposure = EXPOSURE_DEF; + gspca_dev->ctrl_dis |= (1 << COARSE_EXPOSURE_IDX); + } if (gspca_dev->ctrl_dis & (1 << AUTOGAIN_IDX)) sd->autogain = 0; /* Disable do_autogain callback */ else @@ -1001,6 +1033,8 @@ static int sd_start(struct gspca_dev *gspca_dev) sd->frames_to_drop = 0; sd->autogain_ignore_frames = 0; + sd->exp_too_high_cnt = 0; + sd->exp_too_low_cnt = 0; atomic_set(&sd->avg_lum, -1); return 0; } @@ -1159,11 +1193,14 @@ static int sd_setautogain(struct gspca_dev *gspca_dev, __s32 val) struct sd *sd = (struct sd *) gspca_dev; sd->autogain = val; + sd->exp_too_high_cnt = 0; + sd->exp_too_low_cnt = 0; + /* when switching to autogain set defaults to make sure we are on a valid point of the autogain gain / exposure knee graph, and give this change time to take effect before doing autogain. */ - if (sd->autogain) { + if (sd->autogain && !(sensor_data[sd->sensor].flags & F_COARSE_EXPO)) { sd->exposure = EXPOSURE_DEF; sd->gain = GAIN_DEF; if (gspca_dev->streaming) { |