1 /*
2 * vivid-kthread-out.h - video/vbi output thread support functions.
3 *
4 * Copyright 2014 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
5 *
6 * This program is free software; you may redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; version 2 of the License.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
11 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
12 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
13 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
14 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
15 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
16 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
17 * SOFTWARE.
18 */
19
20 #include <linux/module.h>
21 #include <linux/errno.h>
22 #include <linux/kernel.h>
23 #include <linux/init.h>
24 #include <linux/sched.h>
25 #include <linux/slab.h>
26 #include <linux/font.h>
27 #include <linux/mutex.h>
28 #include <linux/videodev2.h>
29 #include <linux/kthread.h>
30 #include <linux/freezer.h>
31 #include <linux/random.h>
32 #include <linux/v4l2-dv-timings.h>
33 #include <asm/div64.h>
34 #include <media/videobuf2-vmalloc.h>
35 #include <media/v4l2-dv-timings.h>
36 #include <media/v4l2-ioctl.h>
37 #include <media/v4l2-fh.h>
38 #include <media/v4l2-event.h>
39
40 #include "vivid-core.h"
41 #include "vivid-vid-common.h"
42 #include "vivid-vid-cap.h"
43 #include "vivid-vid-out.h"
44 #include "vivid-radio-common.h"
45 #include "vivid-radio-rx.h"
46 #include "vivid-radio-tx.h"
47 #include "vivid-sdr-cap.h"
48 #include "vivid-vbi-cap.h"
49 #include "vivid-vbi-out.h"
50 #include "vivid-osd.h"
51 #include "vivid-ctrls.h"
52 #include "vivid-kthread-out.h"
53
vivid_thread_vid_out_tick(struct vivid_dev * dev)54 static void vivid_thread_vid_out_tick(struct vivid_dev *dev)
55 {
56 struct vivid_buffer *vid_out_buf = NULL;
57 struct vivid_buffer *vbi_out_buf = NULL;
58
59 dprintk(dev, 1, "Video Output Thread Tick\n");
60
61 /* Drop a certain percentage of buffers. */
62 if (dev->perc_dropped_buffers &&
63 prandom_u32_max(100) < dev->perc_dropped_buffers)
64 return;
65
66 spin_lock(&dev->slock);
67 /*
68 * Only dequeue buffer if there is at least one more pending.
69 * This makes video loopback possible.
70 */
71 if (!list_empty(&dev->vid_out_active) &&
72 !list_is_singular(&dev->vid_out_active)) {
73 vid_out_buf = list_entry(dev->vid_out_active.next,
74 struct vivid_buffer, list);
75 list_del(&vid_out_buf->list);
76 }
77 if (!list_empty(&dev->vbi_out_active) &&
78 (dev->field_out != V4L2_FIELD_ALTERNATE ||
79 (dev->vbi_out_seq_count & 1))) {
80 vbi_out_buf = list_entry(dev->vbi_out_active.next,
81 struct vivid_buffer, list);
82 list_del(&vbi_out_buf->list);
83 }
84 spin_unlock(&dev->slock);
85
86 if (!vid_out_buf && !vbi_out_buf)
87 return;
88
89 if (vid_out_buf) {
90 vid_out_buf->vb.sequence = dev->vid_out_seq_count;
91 if (dev->field_out == V4L2_FIELD_ALTERNATE) {
92 /*
93 * The sequence counter counts frames, not fields.
94 * So divide by two.
95 */
96 vid_out_buf->vb.sequence /= 2;
97 }
98 v4l2_get_timestamp(&vid_out_buf->vb.timestamp);
99 vid_out_buf->vb.timestamp.tv_sec += dev->time_wrap_offset;
100 vb2_buffer_done(&vid_out_buf->vb.vb2_buf, dev->dqbuf_error ?
101 VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
102 dprintk(dev, 2, "vid_out buffer %d done\n",
103 vid_out_buf->vb.vb2_buf.index);
104 }
105
106 if (vbi_out_buf) {
107 if (dev->stream_sliced_vbi_out)
108 vivid_sliced_vbi_out_process(dev, vbi_out_buf);
109
110 vbi_out_buf->vb.sequence = dev->vbi_out_seq_count;
111 v4l2_get_timestamp(&vbi_out_buf->vb.timestamp);
112 vbi_out_buf->vb.timestamp.tv_sec += dev->time_wrap_offset;
113 vb2_buffer_done(&vbi_out_buf->vb.vb2_buf, dev->dqbuf_error ?
114 VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
115 dprintk(dev, 2, "vbi_out buffer %d done\n",
116 vbi_out_buf->vb.vb2_buf.index);
117 }
118 dev->dqbuf_error = false;
119 }
120
vivid_thread_vid_out(void * data)121 static int vivid_thread_vid_out(void *data)
122 {
123 struct vivid_dev *dev = data;
124 u64 numerators_since_start;
125 u64 buffers_since_start;
126 u64 next_jiffies_since_start;
127 unsigned long jiffies_since_start;
128 unsigned long cur_jiffies;
129 unsigned wait_jiffies;
130 unsigned numerator;
131 unsigned denominator;
132
133 dprintk(dev, 1, "Video Output Thread Start\n");
134
135 set_freezable();
136
137 /* Resets frame counters */
138 dev->out_seq_offset = 0;
139 if (dev->seq_wrap)
140 dev->out_seq_count = 0xffffff80U;
141 dev->jiffies_vid_out = jiffies;
142 dev->vid_out_seq_start = dev->vbi_out_seq_start = 0;
143 dev->out_seq_resync = false;
144
145 for (;;) {
146 try_to_freeze();
147 if (kthread_should_stop())
148 break;
149
150 if (!mutex_trylock(&dev->mutex)) {
151 schedule_timeout_uninterruptible(1);
152 continue;
153 }
154
155 cur_jiffies = jiffies;
156 if (dev->out_seq_resync) {
157 dev->jiffies_vid_out = cur_jiffies;
158 dev->out_seq_offset = dev->out_seq_count + 1;
159 dev->out_seq_count = 0;
160 dev->out_seq_resync = false;
161 }
162 numerator = dev->timeperframe_vid_out.numerator;
163 denominator = dev->timeperframe_vid_out.denominator;
164
165 if (dev->field_out == V4L2_FIELD_ALTERNATE)
166 denominator *= 2;
167
168 /* Calculate the number of jiffies since we started streaming */
169 jiffies_since_start = cur_jiffies - dev->jiffies_vid_out;
170 /* Get the number of buffers streamed since the start */
171 buffers_since_start = (u64)jiffies_since_start * denominator +
172 (HZ * numerator) / 2;
173 do_div(buffers_since_start, HZ * numerator);
174
175 /*
176 * After more than 0xf0000000 (rounded down to a multiple of
177 * 'jiffies-per-day' to ease jiffies_to_msecs calculation)
178 * jiffies have passed since we started streaming reset the
179 * counters and keep track of the sequence offset.
180 */
181 if (jiffies_since_start > JIFFIES_RESYNC) {
182 dev->jiffies_vid_out = cur_jiffies;
183 dev->out_seq_offset = buffers_since_start;
184 buffers_since_start = 0;
185 }
186 dev->out_seq_count = buffers_since_start + dev->out_seq_offset;
187 dev->vid_out_seq_count = dev->out_seq_count - dev->vid_out_seq_start;
188 dev->vbi_out_seq_count = dev->out_seq_count - dev->vbi_out_seq_start;
189
190 vivid_thread_vid_out_tick(dev);
191 mutex_unlock(&dev->mutex);
192
193 /*
194 * Calculate the number of 'numerators' streamed since we started,
195 * not including the current buffer.
196 */
197 numerators_since_start = buffers_since_start * numerator;
198
199 /* And the number of jiffies since we started */
200 jiffies_since_start = jiffies - dev->jiffies_vid_out;
201
202 /* Increase by the 'numerator' of one buffer */
203 numerators_since_start += numerator;
204 /*
205 * Calculate when that next buffer is supposed to start
206 * in jiffies since we started streaming.
207 */
208 next_jiffies_since_start = numerators_since_start * HZ +
209 denominator / 2;
210 do_div(next_jiffies_since_start, denominator);
211 /* If it is in the past, then just schedule asap */
212 if (next_jiffies_since_start < jiffies_since_start)
213 next_jiffies_since_start = jiffies_since_start;
214
215 wait_jiffies = next_jiffies_since_start - jiffies_since_start;
216 schedule_timeout_interruptible(wait_jiffies ? wait_jiffies : 1);
217 }
218 dprintk(dev, 1, "Video Output Thread End\n");
219 return 0;
220 }
221
vivid_grab_controls(struct vivid_dev * dev,bool grab)222 static void vivid_grab_controls(struct vivid_dev *dev, bool grab)
223 {
224 v4l2_ctrl_grab(dev->ctrl_has_crop_out, grab);
225 v4l2_ctrl_grab(dev->ctrl_has_compose_out, grab);
226 v4l2_ctrl_grab(dev->ctrl_has_scaler_out, grab);
227 v4l2_ctrl_grab(dev->ctrl_tx_mode, grab);
228 v4l2_ctrl_grab(dev->ctrl_tx_rgb_range, grab);
229 }
230
vivid_start_generating_vid_out(struct vivid_dev * dev,bool * pstreaming)231 int vivid_start_generating_vid_out(struct vivid_dev *dev, bool *pstreaming)
232 {
233 dprintk(dev, 1, "%s\n", __func__);
234
235 if (dev->kthread_vid_out) {
236 u32 seq_count = dev->out_seq_count + dev->seq_wrap * 128;
237
238 if (pstreaming == &dev->vid_out_streaming)
239 dev->vid_out_seq_start = seq_count;
240 else
241 dev->vbi_out_seq_start = seq_count;
242 *pstreaming = true;
243 return 0;
244 }
245
246 /* Resets frame counters */
247 dev->jiffies_vid_out = jiffies;
248 dev->vid_out_seq_start = dev->seq_wrap * 128;
249 dev->vbi_out_seq_start = dev->seq_wrap * 128;
250
251 dev->kthread_vid_out = kthread_run(vivid_thread_vid_out, dev,
252 "%s-vid-out", dev->v4l2_dev.name);
253
254 if (IS_ERR(dev->kthread_vid_out)) {
255 int err = PTR_ERR(dev->kthread_vid_out);
256
257 dev->kthread_vid_out = NULL;
258 v4l2_err(&dev->v4l2_dev, "kernel_thread() failed\n");
259 return err;
260 }
261 *pstreaming = true;
262 vivid_grab_controls(dev, true);
263
264 dprintk(dev, 1, "returning from %s\n", __func__);
265 return 0;
266 }
267
vivid_stop_generating_vid_out(struct vivid_dev * dev,bool * pstreaming)268 void vivid_stop_generating_vid_out(struct vivid_dev *dev, bool *pstreaming)
269 {
270 dprintk(dev, 1, "%s\n", __func__);
271
272 if (dev->kthread_vid_out == NULL)
273 return;
274
275 *pstreaming = false;
276 if (pstreaming == &dev->vid_out_streaming) {
277 /* Release all active buffers */
278 while (!list_empty(&dev->vid_out_active)) {
279 struct vivid_buffer *buf;
280
281 buf = list_entry(dev->vid_out_active.next,
282 struct vivid_buffer, list);
283 list_del(&buf->list);
284 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
285 dprintk(dev, 2, "vid_out buffer %d done\n",
286 buf->vb.vb2_buf.index);
287 }
288 }
289
290 if (pstreaming == &dev->vbi_out_streaming) {
291 while (!list_empty(&dev->vbi_out_active)) {
292 struct vivid_buffer *buf;
293
294 buf = list_entry(dev->vbi_out_active.next,
295 struct vivid_buffer, list);
296 list_del(&buf->list);
297 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
298 dprintk(dev, 2, "vbi_out buffer %d done\n",
299 buf->vb.vb2_buf.index);
300 }
301 }
302
303 if (dev->vid_out_streaming || dev->vbi_out_streaming)
304 return;
305
306 /* shutdown control thread */
307 vivid_grab_controls(dev, false);
308 kthread_stop(dev->kthread_vid_out);
309 dev->kthread_vid_out = NULL;
310 }
311