diff options
| -rw-r--r-- | drivers/media/platform/coda/coda-common.c | 102 | ||||
| -rw-r--r-- | drivers/media/platform/coda/coda_regs.h | 4 |
2 files changed, 106 insertions, 0 deletions
diff --git a/drivers/media/platform/coda/coda-common.c b/drivers/media/platform/coda/coda-common.c index 24737f1..a7cab14 100644 --- a/drivers/media/platform/coda/coda-common.c +++ b/drivers/media/platform/coda/coda-common.c @@ -15,6 +15,7 @@ #include <linux/debugfs.h> #include <linux/delay.h> #include <linux/firmware.h> +#include <linux/gcd.h> #include <linux/genalloc.h> #include <linux/interrupt.h> #include <linux/io.h> @@ -770,6 +771,104 @@ static int coda_decoder_cmd(struct file *file, void *fh, return 0; } +static int coda_g_parm(struct file *file, void *fh, struct v4l2_streamparm *a) +{ + struct coda_ctx *ctx = fh_to_ctx(fh); + struct v4l2_fract *tpf; + + if (a->type != V4L2_BUF_TYPE_VIDEO_OUTPUT) + return -EINVAL; + + a->parm.output.capability = V4L2_CAP_TIMEPERFRAME; + tpf = &a->parm.output.timeperframe; + tpf->denominator = ctx->params.framerate & CODA_FRATE_RES_MASK; + tpf->numerator = 1 + (ctx->params.framerate >> + CODA_FRATE_DIV_OFFSET); + + return 0; +} + +/* + * Approximate timeperframe v4l2_fract with values that can be written + * into the 16-bit CODA_FRATE_DIV and CODA_FRATE_RES fields. + */ +static void coda_approximate_timeperframe(struct v4l2_fract *timeperframe) +{ + struct v4l2_fract s = *timeperframe; + struct v4l2_fract f0; + struct v4l2_fract f1 = { 1, 0 }; + struct v4l2_fract f2 = { 0, 1 }; + unsigned int i, div, s_denominator; + + /* Lower bound is 1/65535 */ + if (s.numerator == 0 || s.denominator / s.numerator > 65535) { + timeperframe->numerator = 1; + timeperframe->denominator = 65535; + return; + } + + /* Upper bound is 65536/1, map everything above to infinity */ + if (s.denominator == 0 || s.numerator / s.denominator > 65536) { + timeperframe->numerator = 1; + timeperframe->denominator = 0; + return; + } + + /* Reduce fraction to lowest terms */ + div = gcd(s.numerator, s.denominator); + if (div > 1) { + s.numerator /= div; + s.denominator /= div; + } + + if (s.numerator <= 65536 && s.denominator < 65536) { + *timeperframe = s; + return; + } + + /* Find successive convergents from continued fraction expansion */ + while (f2.numerator <= 65536 && f2.denominator < 65536) { + f0 = f1; + f1 = f2; + + /* Stop when f2 exactly equals timeperframe */ + if (s.numerator == 0) + break; + + i = s.denominator / s.numerator; + + f2.numerator = f0.numerator + i * f1.numerator; + f2.denominator = f0.denominator + i * f2.denominator; + + s_denominator = s.numerator; + s.numerator = s.denominator % s.numerator; + s.denominator = s_denominator; + } + + *timeperframe = f1; +} + +static uint32_t coda_timeperframe_to_frate(struct v4l2_fract *timeperframe) +{ + return ((timeperframe->numerator - 1) << CODA_FRATE_DIV_OFFSET) | + timeperframe->denominator; +} + +static int coda_s_parm(struct file *file, void *fh, struct v4l2_streamparm *a) +{ + struct coda_ctx *ctx = fh_to_ctx(fh); + struct v4l2_fract *tpf; + + if (a->type != V4L2_BUF_TYPE_VIDEO_OUTPUT) + return -EINVAL; + + tpf = &a->parm.output.timeperframe; + coda_approximate_timeperframe(tpf); + ctx->params.framerate = coda_timeperframe_to_frate(tpf); + + return 0; +} + static int coda_subscribe_event(struct v4l2_fh *fh, const struct v4l2_event_subscription *sub) { @@ -810,6 +909,9 @@ static const struct v4l2_ioctl_ops coda_ioctl_ops = { .vidioc_try_decoder_cmd = coda_try_decoder_cmd, .vidioc_decoder_cmd = coda_decoder_cmd, + .vidioc_g_parm = coda_g_parm, + .vidioc_s_parm = coda_s_parm, + .vidioc_subscribe_event = coda_subscribe_event, .vidioc_unsubscribe_event = v4l2_event_unsubscribe, }; diff --git a/drivers/media/platform/coda/coda_regs.h b/drivers/media/platform/coda/coda_regs.h index 7d02624..00e4f51 100644 --- a/drivers/media/platform/coda/coda_regs.h +++ b/drivers/media/platform/coda/coda_regs.h @@ -263,6 +263,10 @@ #define CODADX6_PICHEIGHT_MASK 0x3ff #define CODA7_PICHEIGHT_MASK 0xffff #define CODA_CMD_ENC_SEQ_SRC_F_RATE 0x194 +#define CODA_FRATE_RES_OFFSET 0 +#define CODA_FRATE_RES_MASK 0xffff +#define CODA_FRATE_DIV_OFFSET 16 +#define CODA_FRATE_DIV_MASK 0xffff #define CODA_CMD_ENC_SEQ_MP4_PARA 0x198 #define CODA_MP4PARAM_VERID_OFFSET 6 #define CODA_MP4PARAM_VERID_MASK 0x01 |
