The allegro dvt codec adjust the encoding speed according to a
configured frame rate. Furthermore, the frame rate is written into the
coded stream.
Ensure that the coded video data has the correct frame rate by
implementing s_parm for setting the frame rate from user space.
Signed-off-by: Michael Tretter <m.tretter@xxxxxxxxxxxxxx>
---
.../staging/media/allegro-dvt/allegro-core.c | 60 +++++++++++++++++--
1 file changed, 55 insertions(+), 5 deletions(-)
diff --git a/drivers/staging/media/allegro-dvt/allegro-core.c b/drivers/staging/media/allegro-dvt/allegro-core.c
index 71ed3abc61f0..3ecc38047436 100644
--- a/drivers/staging/media/allegro-dvt/allegro-core.c
+++ b/drivers/staging/media/allegro-dvt/allegro-core.c
@@ -7,6 +7,7 @@
#include <linux/bits.h>
#include <linux/firmware.h>
+#include <linux/gcd.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/kernel.h>
@@ -41,6 +42,8 @@
#define ALLEGRO_HEIGHT_DEFAULT 1080
#define ALLEGRO_HEIGHT_MAX 2160
+#define ALLEGRO_FRAMERATE_DEFAULT (struct v4l2_fract) { 30, 1 };
+
#define ALLEGRO_GOP_SIZE_DEFAULT 25
#define ALLEGRO_GOP_SIZE_MAX 1000
@@ -177,6 +180,7 @@ struct allegro_channel {
unsigned int width;
unsigned int height;
unsigned int stride;
+ struct v4l2_fract framerate;
enum v4l2_colorspace colorspace;
enum v4l2_ycbcr_encoding ycbcr_enc;
@@ -1123,8 +1127,9 @@ static int allegro_mcu_send_create_channel(struct allegro_dev *dev,
(channel->cpb_size * 90000) / (channel->bitrate_peak / 1000 / BITS_PER_BYTE);
/* Shall be ]0;cpb_size in 90 kHz units]. Use maximum value. */
msg.initial_rem_delay = msg.cpb_size;
- msg.framerate = 25;
- msg.clk_ratio = 1000;
+ msg.framerate = DIV_ROUND_UP(channel->framerate.numerator,
+ channel->framerate.denominator);
+ msg.clk_ratio = channel->framerate.denominator == 1001 ? 1001 : 1000;
msg.target_bitrate = channel->bitrate;
msg.max_bitrate = channel->bitrate_peak;
msg.initial_qp = 25;
@@ -1433,9 +1438,11 @@ static ssize_t allegro_h264_write_sps(struct allegro_channel *channel,
sps->vui.chroma_loc_info_present_flag = 1;
sps->vui.chroma_sample_loc_type_top_field = 0;
sps->vui.chroma_sample_loc_type_bottom_field = 0;
+
sps->vui.timing_info_present_flag = 1;
- sps->vui.num_units_in_tick = 1;
- sps->vui.time_scale = 50;
+ sps->vui.num_units_in_tick = channel->framerate.denominator;
+ sps->vui.time_scale = 2 * channel->framerate.numerator;
+
sps->vui.fixed_frame_rate_flag = 1;
sps->vui.nal_hrd_parameters_present_flag = 0;
sps->vui.vcl_hrd_parameters_present_flag = 1;
@@ -2100,7 +2107,8 @@ static int allegro_create_channel(struct allegro_channel *channel)
v4l2_dbg(1, debug, &dev->v4l2_dev,
"user %d: creating channel (%4.4s, %dx%d@%d)\n",
channel->user_id,
- (char *)&channel->codec, channel->width, channel->height, 25);
+ (char *)&channel->codec, channel->width, channel->height,
+ DIV_ROUND_UP(channel->framerate.numerator, channel->framerate.denominator));
min_level = select_minimum_h264_level(channel->width, channel->height);
if (channel->level < min_level) {
@@ -2146,6 +2154,7 @@ static void allegro_set_default_params(struct allegro_channel *channel)
channel->width = ALLEGRO_WIDTH_DEFAULT;
channel->height = ALLEGRO_HEIGHT_DEFAULT;
channel->stride = round_up(channel->width, 32);
+ channel->framerate = ALLEGRO_FRAMERATE_DEFAULT;
channel->colorspace = V4L2_COLORSPACE_REC709;
channel->ycbcr_enc = V4L2_YCBCR_ENC_DEFAULT;
@@ -2736,6 +2745,44 @@ static int allegro_ioctl_streamon(struct file *file, void *priv,
return v4l2_m2m_streamon(file, fh->m2m_ctx, type);
}
+static int allegro_g_parm(struct file *file, void *fh, struct v4l2_streamparm *a)
+{
+ struct allegro_channel *channel = fh_to_channel(fh);
+ struct v4l2_fract *timeperframe;
+
+ if (a->type != V4L2_BUF_TYPE_VIDEO_OUTPUT)
+ return -EINVAL;
+
+ a->parm.output.capability = V4L2_CAP_TIMEPERFRAME;
+ timeperframe = &a->parm.output.timeperframe;
+ timeperframe->numerator = channel->framerate.denominator;
+ timeperframe->denominator = channel->framerate.numerator;
+
+ return 0;
+}
+
+static int allegro_s_parm(struct file *file, void *fh, struct v4l2_streamparm *a)
+{
+ struct allegro_channel *channel = fh_to_channel(fh);
+ struct v4l2_fract *timeperframe;
+ int div;
+
+ if (a->type != V4L2_BUF_TYPE_VIDEO_OUTPUT)
+ return -EINVAL;
+
+ a->parm.output.capability = V4L2_CAP_TIMEPERFRAME;
+ timeperframe = &a->parm.output.timeperframe;
+
+ if (timeperframe->numerator == 0 || timeperframe->denominator == 0)
+ return allegro_g_parm(file, fh, a);
+
+ div = gcd(timeperframe->denominator, timeperframe->numerator);
+ channel->framerate.numerator = timeperframe->denominator / div;
+ channel->framerate.denominator = timeperframe->numerator / div;
+
+ return 0;
+}
+
static int allegro_subscribe_event(struct v4l2_fh *fh,
const struct v4l2_event_subscription *sub)
{
@@ -2774,6 +2821,9 @@ static const struct v4l2_ioctl_ops allegro_ioctl_ops = {
.vidioc_encoder_cmd = allegro_encoder_cmd,
.vidioc_enum_framesizes = allegro_enum_framesizes,
+ .vidioc_g_parm = allegro_g_parm,
+ .vidioc_s_parm = allegro_s_parm,
+
.vidioc_subscribe_event = allegro_subscribe_event,
.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
};
--
2.20.1
