--- /dev/null
+/*
+ * vivid-kthread-out.h - video/vbi output thread support functions.
+ *
+ * Copyright 2014 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
+ *
+ * This program is free software; you may redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/font.h>
+#include <linux/mutex.h>
+#include <linux/videodev2.h>
+#include <linux/kthread.h>
+#include <linux/freezer.h>
+#include <linux/random.h>
+#include <linux/v4l2-dv-timings.h>
+#include <asm/div64.h>
+#include <media/videobuf2-vmalloc.h>
+#include <media/v4l2-dv-timings.h>
+#include <media/v4l2-ioctl.h>
+#include <media/v4l2-fh.h>
+#include <media/v4l2-event.h>
+
+#include "vivid-core.h"
+#include "vivid-vid-common.h"
+#include "vivid-vid-cap.h"
+#include "vivid-vid-out.h"
+#include "vivid-radio-common.h"
+#include "vivid-radio-rx.h"
+#include "vivid-radio-tx.h"
+#include "vivid-sdr-cap.h"
+#include "vivid-vbi-cap.h"
+#include "vivid-vbi-out.h"
+#include "vivid-osd.h"
+#include "vivid-ctrls.h"
+#include "vivid-kthread-out.h"
+
+static void vivid_thread_vid_out_tick(struct vivid_dev *dev)
+{
+ struct vivid_buffer *vid_out_buf = NULL;
+ struct vivid_buffer *vbi_out_buf = NULL;
+
+ dprintk(dev, 1, "Video Output Thread Tick\n");
+
+ /* Drop a certain percentage of buffers. */
+ if (dev->perc_dropped_buffers &&
+ prandom_u32_max(100) < dev->perc_dropped_buffers)
+ return;
+
+ spin_lock(&dev->slock);
+ /*
+ * Only dequeue buffer if there is at least one more pending.
+ * This makes video loopback possible.
+ */
+ if (!list_empty(&dev->vid_out_active) &&
+ !list_is_singular(&dev->vid_out_active)) {
+ vid_out_buf = list_entry(dev->vid_out_active.next,
+ struct vivid_buffer, list);
+ list_del(&vid_out_buf->list);
+ }
+ if (!list_empty(&dev->vbi_out_active) &&
+ (dev->field_out != V4L2_FIELD_ALTERNATE ||
+ (dev->vbi_out_seq_count & 1))) {
+ vbi_out_buf = list_entry(dev->vbi_out_active.next,
+ struct vivid_buffer, list);
+ list_del(&vbi_out_buf->list);
+ }
+ spin_unlock(&dev->slock);
+
+ if (!vid_out_buf && !vbi_out_buf)
+ return;
+
+ if (vid_out_buf) {
+ vid_out_buf->vb.v4l2_buf.sequence = dev->vid_out_seq_count;
+ if (dev->field_out == V4L2_FIELD_ALTERNATE) {
+ /*
+ * The sequence counter counts frames, not fields. So divide
+ * by two.
+ */
+ vid_out_buf->vb.v4l2_buf.sequence /= 2;
+ }
+ v4l2_get_timestamp(&vid_out_buf->vb.v4l2_buf.timestamp);
+ vid_out_buf->vb.v4l2_buf.timestamp.tv_sec += dev->time_wrap_offset;
+ vb2_buffer_done(&vid_out_buf->vb, dev->dqbuf_error ?
+ VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
+ dprintk(dev, 2, "vid_out buffer %d done\n",
+ vid_out_buf->vb.v4l2_buf.index);
+ }
+
+ if (vbi_out_buf) {
+ if (dev->stream_sliced_vbi_out)
+ vivid_sliced_vbi_out_process(dev, vbi_out_buf);
+
+ vbi_out_buf->vb.v4l2_buf.sequence = dev->vbi_out_seq_count;
+ v4l2_get_timestamp(&vbi_out_buf->vb.v4l2_buf.timestamp);
+ vbi_out_buf->vb.v4l2_buf.timestamp.tv_sec += dev->time_wrap_offset;
+ vb2_buffer_done(&vbi_out_buf->vb, dev->dqbuf_error ?
+ VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
+ dprintk(dev, 2, "vbi_out buffer %d done\n",
+ vbi_out_buf->vb.v4l2_buf.index);
+ }
+ dev->dqbuf_error = false;
+}
+
+static int vivid_thread_vid_out(void *data)
+{
+ struct vivid_dev *dev = data;
+ u64 numerators_since_start;
+ u64 buffers_since_start;
+ u64 next_jiffies_since_start;
+ unsigned long jiffies_since_start;
+ unsigned long cur_jiffies;
+ unsigned wait_jiffies;
+ unsigned numerator;
+ unsigned denominator;
+
+ dprintk(dev, 1, "Video Output Thread Start\n");
+
+ set_freezable();
+
+ /* Resets frame counters */
+ dev->out_seq_offset = 0;
+ if (dev->seq_wrap)
+ dev->out_seq_count = 0xffffff80U;
+ dev->jiffies_vid_out = jiffies;
+ dev->vid_out_seq_start = dev->vbi_out_seq_start = 0;
+ dev->out_seq_resync = false;
+
+ for (;;) {
+ try_to_freeze();
+ if (kthread_should_stop())
+ break;
+
+ mutex_lock(&dev->mutex);
+ cur_jiffies = jiffies;
+ if (dev->out_seq_resync) {
+ dev->jiffies_vid_out = cur_jiffies;
+ dev->out_seq_offset = dev->out_seq_count + 1;
+ dev->out_seq_count = 0;
+ dev->out_seq_resync = false;
+ }
+ numerator = dev->timeperframe_vid_out.numerator;
+ denominator = dev->timeperframe_vid_out.denominator;
+
+ if (dev->field_out == V4L2_FIELD_ALTERNATE)
+ denominator *= 2;
+
+ /* Calculate the number of jiffies since we started streaming */
+ jiffies_since_start = cur_jiffies - dev->jiffies_vid_out;
+ /* Get the number of buffers streamed since the start */
+ buffers_since_start = (u64)jiffies_since_start * denominator +
+ (HZ * numerator) / 2;
+ do_div(buffers_since_start, HZ * numerator);
+
+ /*
+ * After more than 0xf0000000 (rounded down to a multiple of
+ * 'jiffies-per-day' to ease jiffies_to_msecs calculation)
+ * jiffies have passed since we started streaming reset the
+ * counters and keep track of the sequence offset.
+ */
+ if (jiffies_since_start > JIFFIES_RESYNC) {
+ dev->jiffies_vid_out = cur_jiffies;
+ dev->out_seq_offset = buffers_since_start;
+ buffers_since_start = 0;
+ }
+ dev->out_seq_count = buffers_since_start + dev->out_seq_offset;
+ dev->vid_out_seq_count = dev->out_seq_count - dev->vid_out_seq_start;
+ dev->vbi_out_seq_count = dev->out_seq_count - dev->vbi_out_seq_start;
+
+ vivid_thread_vid_out_tick(dev);
+ mutex_unlock(&dev->mutex);
+
+ /*
+ * Calculate the number of 'numerators' streamed since we started,
+ * not including the current buffer.
+ */
+ numerators_since_start = buffers_since_start * numerator;
+
+ /* And the number of jiffies since we started */
+ jiffies_since_start = jiffies - dev->jiffies_vid_out;
+
+ /* Increase by the 'numerator' of one buffer */
+ numerators_since_start += numerator;
+ /*
+ * Calculate when that next buffer is supposed to start
+ * in jiffies since we started streaming.
+ */
+ next_jiffies_since_start = numerators_since_start * HZ +
+ denominator / 2;
+ do_div(next_jiffies_since_start, denominator);
+ /* If it is in the past, then just schedule asap */
+ if (next_jiffies_since_start < jiffies_since_start)
+ next_jiffies_since_start = jiffies_since_start;
+
+ wait_jiffies = next_jiffies_since_start - jiffies_since_start;
+ schedule_timeout_interruptible(wait_jiffies ? wait_jiffies : 1);
+ }
+ dprintk(dev, 1, "Video Output Thread End\n");
+ return 0;
+}
+
+static void vivid_grab_controls(struct vivid_dev *dev, bool grab)
+{
+ v4l2_ctrl_grab(dev->ctrl_has_crop_out, grab);
+ v4l2_ctrl_grab(dev->ctrl_has_compose_out, grab);
+ v4l2_ctrl_grab(dev->ctrl_has_scaler_out, grab);
+ v4l2_ctrl_grab(dev->ctrl_tx_mode, grab);
+ v4l2_ctrl_grab(dev->ctrl_tx_rgb_range, grab);
+}
+
+int vivid_start_generating_vid_out(struct vivid_dev *dev, bool *pstreaming)
+{
+ dprintk(dev, 1, "%s\n", __func__);
+
+ if (dev->kthread_vid_out) {
+ u32 seq_count = dev->out_seq_count + dev->seq_wrap * 128;
+
+ if (pstreaming == &dev->vid_out_streaming)
+ dev->vid_out_seq_start = seq_count;
+ else
+ dev->vbi_out_seq_start = seq_count;
+ *pstreaming = true;
+ return 0;
+ }
+
+ /* Resets frame counters */
+ dev->jiffies_vid_out = jiffies;
+ dev->vid_out_seq_start = dev->seq_wrap * 128;
+ dev->vbi_out_seq_start = dev->seq_wrap * 128;
+
+ dev->kthread_vid_out = kthread_run(vivid_thread_vid_out, dev,
+ "%s-vid-out", dev->v4l2_dev.name);
+
+ if (IS_ERR(dev->kthread_vid_out)) {
+ v4l2_err(&dev->v4l2_dev, "kernel_thread() failed\n");
+ return PTR_ERR(dev->kthread_vid_out);
+ }
+ *pstreaming = true;
+ vivid_grab_controls(dev, true);
+
+ dprintk(dev, 1, "returning from %s\n", __func__);
+ return 0;
+}
+
+void vivid_stop_generating_vid_out(struct vivid_dev *dev, bool *pstreaming)
+{
+ dprintk(dev, 1, "%s\n", __func__);
+
+ if (dev->kthread_vid_out == NULL)
+ return;
+
+ *pstreaming = false;
+ if (pstreaming == &dev->vid_out_streaming) {
+ /* Release all active buffers */
+ while (!list_empty(&dev->vid_out_active)) {
+ struct vivid_buffer *buf;
+
+ buf = list_entry(dev->vid_out_active.next,
+ struct vivid_buffer, list);
+ list_del(&buf->list);
+ vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR);
+ dprintk(dev, 2, "vid_out buffer %d done\n",
+ buf->vb.v4l2_buf.index);
+ }
+ }
+
+ if (pstreaming == &dev->vbi_out_streaming) {
+ while (!list_empty(&dev->vbi_out_active)) {
+ struct vivid_buffer *buf;
+
+ buf = list_entry(dev->vbi_out_active.next,
+ struct vivid_buffer, list);
+ list_del(&buf->list);
+ vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR);
+ dprintk(dev, 2, "vbi_out buffer %d done\n",
+ buf->vb.v4l2_buf.index);
+ }
+ }
+
+ if (dev->vid_out_streaming || dev->vbi_out_streaming)
+ return;
+
+ /* shutdown control thread */
+ vivid_grab_controls(dev, false);
+ mutex_unlock(&dev->mutex);
+ kthread_stop(dev->kthread_vid_out);
+ dev->kthread_vid_out = NULL;
+ mutex_lock(&dev->mutex);
+}
Code Review / kvmfornfv.git / blobdiff