aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/media/platform/vivid/vivid-kthread-out.c
blob: d9f36ccd7efb6446357e6dc115b03bdc553b9247 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
/*
 * 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);
}

Privacy Policy