299 lines
8.4 KiB
C
299 lines
8.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* vivid-kthread-out.h - video/vbi output thread support functions.
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*
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* Copyright 2014 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
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*/
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/font.h>
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#include <linux/mutex.h>
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#include <linux/videodev2.h>
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#include <linux/kthread.h>
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#include <linux/freezer.h>
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#include <linux/random.h>
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#include <linux/v4l2-dv-timings.h>
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#include <asm/div64.h>
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#include <media/videobuf2-vmalloc.h>
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#include <media/v4l2-dv-timings.h>
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#include <media/v4l2-ioctl.h>
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#include <media/v4l2-fh.h>
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#include <media/v4l2-event.h>
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#include "vivid-core.h"
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#include "vivid-vid-common.h"
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#include "vivid-vid-cap.h"
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#include "vivid-vid-out.h"
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#include "vivid-radio-common.h"
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#include "vivid-radio-rx.h"
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#include "vivid-radio-tx.h"
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#include "vivid-sdr-cap.h"
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#include "vivid-vbi-cap.h"
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#include "vivid-vbi-out.h"
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#include "vivid-osd.h"
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#include "vivid-ctrls.h"
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#include "vivid-kthread-out.h"
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static void vivid_thread_vid_out_tick(struct vivid_dev *dev)
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{
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struct vivid_buffer *vid_out_buf = NULL;
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struct vivid_buffer *vbi_out_buf = NULL;
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dprintk(dev, 1, "Video Output Thread Tick\n");
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/* Drop a certain percentage of buffers. */
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if (dev->perc_dropped_buffers &&
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prandom_u32_max(100) < dev->perc_dropped_buffers)
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return;
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spin_lock(&dev->slock);
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/*
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* Only dequeue buffer if there is at least one more pending.
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* This makes video loopback possible.
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*/
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if (!list_empty(&dev->vid_out_active) &&
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!list_is_singular(&dev->vid_out_active)) {
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vid_out_buf = list_entry(dev->vid_out_active.next,
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struct vivid_buffer, list);
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list_del(&vid_out_buf->list);
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}
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if (!list_empty(&dev->vbi_out_active) &&
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(dev->field_out != V4L2_FIELD_ALTERNATE ||
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(dev->vbi_out_seq_count & 1))) {
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vbi_out_buf = list_entry(dev->vbi_out_active.next,
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struct vivid_buffer, list);
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list_del(&vbi_out_buf->list);
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}
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spin_unlock(&dev->slock);
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if (!vid_out_buf && !vbi_out_buf)
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return;
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if (vid_out_buf) {
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vid_out_buf->vb.sequence = dev->vid_out_seq_count;
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if (dev->field_out == V4L2_FIELD_ALTERNATE) {
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/*
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* The sequence counter counts frames, not fields.
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* So divide by two.
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*/
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vid_out_buf->vb.sequence /= 2;
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}
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vid_out_buf->vb.vb2_buf.timestamp =
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ktime_get_ns() + dev->time_wrap_offset;
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vb2_buffer_done(&vid_out_buf->vb.vb2_buf, dev->dqbuf_error ?
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VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
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dprintk(dev, 2, "vid_out buffer %d done\n",
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vid_out_buf->vb.vb2_buf.index);
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}
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if (vbi_out_buf) {
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if (dev->stream_sliced_vbi_out)
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vivid_sliced_vbi_out_process(dev, vbi_out_buf);
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vbi_out_buf->vb.sequence = dev->vbi_out_seq_count;
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vbi_out_buf->vb.vb2_buf.timestamp =
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ktime_get_ns() + dev->time_wrap_offset;
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vb2_buffer_done(&vbi_out_buf->vb.vb2_buf, dev->dqbuf_error ?
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VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
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dprintk(dev, 2, "vbi_out buffer %d done\n",
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vbi_out_buf->vb.vb2_buf.index);
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}
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dev->dqbuf_error = false;
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}
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static int vivid_thread_vid_out(void *data)
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{
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struct vivid_dev *dev = data;
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u64 numerators_since_start;
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u64 buffers_since_start;
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u64 next_jiffies_since_start;
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unsigned long jiffies_since_start;
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unsigned long cur_jiffies;
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unsigned wait_jiffies;
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unsigned numerator;
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unsigned denominator;
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dprintk(dev, 1, "Video Output Thread Start\n");
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set_freezable();
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/* Resets frame counters */
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dev->out_seq_offset = 0;
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if (dev->seq_wrap)
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dev->out_seq_count = 0xffffff80U;
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dev->jiffies_vid_out = jiffies;
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dev->vid_out_seq_start = dev->vbi_out_seq_start = 0;
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dev->out_seq_resync = false;
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for (;;) {
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try_to_freeze();
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if (kthread_should_stop())
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break;
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if (!mutex_trylock(&dev->mutex)) {
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schedule_timeout_uninterruptible(1);
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continue;
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}
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cur_jiffies = jiffies;
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if (dev->out_seq_resync) {
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dev->jiffies_vid_out = cur_jiffies;
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dev->out_seq_offset = dev->out_seq_count + 1;
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dev->out_seq_count = 0;
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dev->out_seq_resync = false;
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}
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numerator = dev->timeperframe_vid_out.numerator;
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denominator = dev->timeperframe_vid_out.denominator;
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if (dev->field_out == V4L2_FIELD_ALTERNATE)
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denominator *= 2;
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/* Calculate the number of jiffies since we started streaming */
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jiffies_since_start = cur_jiffies - dev->jiffies_vid_out;
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/* Get the number of buffers streamed since the start */
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buffers_since_start = (u64)jiffies_since_start * denominator +
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(HZ * numerator) / 2;
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do_div(buffers_since_start, HZ * numerator);
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/*
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* After more than 0xf0000000 (rounded down to a multiple of
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* 'jiffies-per-day' to ease jiffies_to_msecs calculation)
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* jiffies have passed since we started streaming reset the
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* counters and keep track of the sequence offset.
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*/
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if (jiffies_since_start > JIFFIES_RESYNC) {
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dev->jiffies_vid_out = cur_jiffies;
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dev->out_seq_offset = buffers_since_start;
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buffers_since_start = 0;
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}
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dev->out_seq_count = buffers_since_start + dev->out_seq_offset;
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dev->vid_out_seq_count = dev->out_seq_count - dev->vid_out_seq_start;
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dev->vbi_out_seq_count = dev->out_seq_count - dev->vbi_out_seq_start;
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vivid_thread_vid_out_tick(dev);
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mutex_unlock(&dev->mutex);
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/*
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* Calculate the number of 'numerators' streamed since we started,
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* not including the current buffer.
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*/
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numerators_since_start = buffers_since_start * numerator;
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/* And the number of jiffies since we started */
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jiffies_since_start = jiffies - dev->jiffies_vid_out;
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/* Increase by the 'numerator' of one buffer */
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numerators_since_start += numerator;
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/*
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* Calculate when that next buffer is supposed to start
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* in jiffies since we started streaming.
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*/
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next_jiffies_since_start = numerators_since_start * HZ +
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denominator / 2;
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do_div(next_jiffies_since_start, denominator);
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/* If it is in the past, then just schedule asap */
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if (next_jiffies_since_start < jiffies_since_start)
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next_jiffies_since_start = jiffies_since_start;
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wait_jiffies = next_jiffies_since_start - jiffies_since_start;
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schedule_timeout_interruptible(wait_jiffies ? wait_jiffies : 1);
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}
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dprintk(dev, 1, "Video Output Thread End\n");
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return 0;
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}
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static void vivid_grab_controls(struct vivid_dev *dev, bool grab)
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{
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v4l2_ctrl_grab(dev->ctrl_has_crop_out, grab);
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v4l2_ctrl_grab(dev->ctrl_has_compose_out, grab);
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v4l2_ctrl_grab(dev->ctrl_has_scaler_out, grab);
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v4l2_ctrl_grab(dev->ctrl_tx_mode, grab);
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v4l2_ctrl_grab(dev->ctrl_tx_rgb_range, grab);
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}
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int vivid_start_generating_vid_out(struct vivid_dev *dev, bool *pstreaming)
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{
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dprintk(dev, 1, "%s\n", __func__);
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if (dev->kthread_vid_out) {
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u32 seq_count = dev->out_seq_count + dev->seq_wrap * 128;
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if (pstreaming == &dev->vid_out_streaming)
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dev->vid_out_seq_start = seq_count;
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else
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dev->vbi_out_seq_start = seq_count;
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*pstreaming = true;
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return 0;
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}
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/* Resets frame counters */
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dev->jiffies_vid_out = jiffies;
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dev->vid_out_seq_start = dev->seq_wrap * 128;
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dev->vbi_out_seq_start = dev->seq_wrap * 128;
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dev->kthread_vid_out = kthread_run(vivid_thread_vid_out, dev,
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"%s-vid-out", dev->v4l2_dev.name);
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if (IS_ERR(dev->kthread_vid_out)) {
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int err = PTR_ERR(dev->kthread_vid_out);
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dev->kthread_vid_out = NULL;
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v4l2_err(&dev->v4l2_dev, "kernel_thread() failed\n");
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return err;
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}
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*pstreaming = true;
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vivid_grab_controls(dev, true);
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dprintk(dev, 1, "returning from %s\n", __func__);
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return 0;
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}
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void vivid_stop_generating_vid_out(struct vivid_dev *dev, bool *pstreaming)
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{
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dprintk(dev, 1, "%s\n", __func__);
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if (dev->kthread_vid_out == NULL)
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return;
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*pstreaming = false;
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if (pstreaming == &dev->vid_out_streaming) {
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/* Release all active buffers */
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while (!list_empty(&dev->vid_out_active)) {
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struct vivid_buffer *buf;
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buf = list_entry(dev->vid_out_active.next,
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struct vivid_buffer, list);
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list_del(&buf->list);
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vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
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dprintk(dev, 2, "vid_out buffer %d done\n",
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buf->vb.vb2_buf.index);
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}
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}
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if (pstreaming == &dev->vbi_out_streaming) {
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while (!list_empty(&dev->vbi_out_active)) {
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struct vivid_buffer *buf;
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buf = list_entry(dev->vbi_out_active.next,
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struct vivid_buffer, list);
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list_del(&buf->list);
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vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
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dprintk(dev, 2, "vbi_out buffer %d done\n",
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buf->vb.vb2_buf.index);
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}
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}
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if (dev->vid_out_streaming || dev->vbi_out_streaming)
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return;
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/* shutdown control thread */
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vivid_grab_controls(dev, false);
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kthread_stop(dev->kthread_vid_out);
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dev->kthread_vid_out = NULL;
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}
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