Hans Verkuil | 3f682ff | 2014-08-25 08:00:20 -0300 | [diff] [blame] | 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" |
Mauro Carvalho Chehab | 96ec7d2 | 2014-09-02 17:57:34 -0300 | [diff] [blame] | 52 | #include "vivid-kthread-out.h" |
Hans Verkuil | 3f682ff | 2014-08-25 08:00:20 -0300 | [diff] [blame] | 53 | |
| 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.v4l2_buf.sequence = dev->vid_out_seq_count; |
| 91 | if (dev->field_out == V4L2_FIELD_ALTERNATE) { |
| 92 | /* |
| 93 | * The sequence counter counts frames, not fields. So divide |
| 94 | * by two. |
| 95 | */ |
| 96 | vid_out_buf->vb.v4l2_buf.sequence /= 2; |
| 97 | } |
| 98 | v4l2_get_timestamp(&vid_out_buf->vb.v4l2_buf.timestamp); |
| 99 | vid_out_buf->vb.v4l2_buf.timestamp.tv_sec += dev->time_wrap_offset; |
| 100 | vb2_buffer_done(&vid_out_buf->vb, 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.v4l2_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.v4l2_buf.sequence = dev->vbi_out_seq_count; |
| 111 | v4l2_get_timestamp(&vbi_out_buf->vb.v4l2_buf.timestamp); |
| 112 | vbi_out_buf->vb.v4l2_buf.timestamp.tv_sec += dev->time_wrap_offset; |
| 113 | vb2_buffer_done(&vbi_out_buf->vb, 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.v4l2_buf.index); |
| 117 | } |
| 118 | dev->dqbuf_error = false; |
| 119 | } |
| 120 | |
| 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 | mutex_lock(&dev->mutex); |
| 151 | cur_jiffies = jiffies; |
| 152 | if (dev->out_seq_resync) { |
| 153 | dev->jiffies_vid_out = cur_jiffies; |
| 154 | dev->out_seq_offset = dev->out_seq_count + 1; |
| 155 | dev->out_seq_count = 0; |
| 156 | dev->out_seq_resync = false; |
| 157 | } |
| 158 | numerator = dev->timeperframe_vid_out.numerator; |
| 159 | denominator = dev->timeperframe_vid_out.denominator; |
| 160 | |
| 161 | if (dev->field_out == V4L2_FIELD_ALTERNATE) |
| 162 | denominator *= 2; |
| 163 | |
| 164 | /* Calculate the number of jiffies since we started streaming */ |
| 165 | jiffies_since_start = cur_jiffies - dev->jiffies_vid_out; |
| 166 | /* Get the number of buffers streamed since the start */ |
| 167 | buffers_since_start = (u64)jiffies_since_start * denominator + |
| 168 | (HZ * numerator) / 2; |
| 169 | do_div(buffers_since_start, HZ * numerator); |
| 170 | |
| 171 | /* |
| 172 | * After more than 0xf0000000 (rounded down to a multiple of |
| 173 | * 'jiffies-per-day' to ease jiffies_to_msecs calculation) |
| 174 | * jiffies have passed since we started streaming reset the |
| 175 | * counters and keep track of the sequence offset. |
| 176 | */ |
| 177 | if (jiffies_since_start > JIFFIES_RESYNC) { |
| 178 | dev->jiffies_vid_out = cur_jiffies; |
| 179 | dev->out_seq_offset = buffers_since_start; |
| 180 | buffers_since_start = 0; |
| 181 | } |
| 182 | dev->out_seq_count = buffers_since_start + dev->out_seq_offset; |
| 183 | dev->vid_out_seq_count = dev->out_seq_count - dev->vid_out_seq_start; |
| 184 | dev->vbi_out_seq_count = dev->out_seq_count - dev->vbi_out_seq_start; |
| 185 | |
| 186 | vivid_thread_vid_out_tick(dev); |
| 187 | mutex_unlock(&dev->mutex); |
| 188 | |
| 189 | /* |
| 190 | * Calculate the number of 'numerators' streamed since we started, |
| 191 | * not including the current buffer. |
| 192 | */ |
| 193 | numerators_since_start = buffers_since_start * numerator; |
| 194 | |
| 195 | /* And the number of jiffies since we started */ |
| 196 | jiffies_since_start = jiffies - dev->jiffies_vid_out; |
| 197 | |
| 198 | /* Increase by the 'numerator' of one buffer */ |
| 199 | numerators_since_start += numerator; |
| 200 | /* |
| 201 | * Calculate when that next buffer is supposed to start |
| 202 | * in jiffies since we started streaming. |
| 203 | */ |
| 204 | next_jiffies_since_start = numerators_since_start * HZ + |
| 205 | denominator / 2; |
| 206 | do_div(next_jiffies_since_start, denominator); |
| 207 | /* If it is in the past, then just schedule asap */ |
| 208 | if (next_jiffies_since_start < jiffies_since_start) |
| 209 | next_jiffies_since_start = jiffies_since_start; |
| 210 | |
| 211 | wait_jiffies = next_jiffies_since_start - jiffies_since_start; |
| 212 | schedule_timeout_interruptible(wait_jiffies ? wait_jiffies : 1); |
| 213 | } |
| 214 | dprintk(dev, 1, "Video Output Thread End\n"); |
| 215 | return 0; |
| 216 | } |
| 217 | |
| 218 | static void vivid_grab_controls(struct vivid_dev *dev, bool grab) |
| 219 | { |
| 220 | v4l2_ctrl_grab(dev->ctrl_has_crop_out, grab); |
| 221 | v4l2_ctrl_grab(dev->ctrl_has_compose_out, grab); |
| 222 | v4l2_ctrl_grab(dev->ctrl_has_scaler_out, grab); |
| 223 | v4l2_ctrl_grab(dev->ctrl_tx_mode, grab); |
| 224 | v4l2_ctrl_grab(dev->ctrl_tx_rgb_range, grab); |
| 225 | } |
| 226 | |
| 227 | int vivid_start_generating_vid_out(struct vivid_dev *dev, bool *pstreaming) |
| 228 | { |
| 229 | dprintk(dev, 1, "%s\n", __func__); |
| 230 | |
| 231 | if (dev->kthread_vid_out) { |
| 232 | u32 seq_count = dev->out_seq_count + dev->seq_wrap * 128; |
| 233 | |
| 234 | if (pstreaming == &dev->vid_out_streaming) |
| 235 | dev->vid_out_seq_start = seq_count; |
| 236 | else |
| 237 | dev->vbi_out_seq_start = seq_count; |
| 238 | *pstreaming = true; |
| 239 | return 0; |
| 240 | } |
| 241 | |
| 242 | /* Resets frame counters */ |
| 243 | dev->jiffies_vid_out = jiffies; |
| 244 | dev->vid_out_seq_start = dev->seq_wrap * 128; |
| 245 | dev->vbi_out_seq_start = dev->seq_wrap * 128; |
| 246 | |
| 247 | dev->kthread_vid_out = kthread_run(vivid_thread_vid_out, dev, |
| 248 | "%s-vid-out", dev->v4l2_dev.name); |
| 249 | |
| 250 | if (IS_ERR(dev->kthread_vid_out)) { |
| 251 | v4l2_err(&dev->v4l2_dev, "kernel_thread() failed\n"); |
| 252 | return PTR_ERR(dev->kthread_vid_out); |
| 253 | } |
| 254 | *pstreaming = true; |
| 255 | vivid_grab_controls(dev, true); |
| 256 | |
| 257 | dprintk(dev, 1, "returning from %s\n", __func__); |
| 258 | return 0; |
| 259 | } |
| 260 | |
| 261 | void vivid_stop_generating_vid_out(struct vivid_dev *dev, bool *pstreaming) |
| 262 | { |
| 263 | dprintk(dev, 1, "%s\n", __func__); |
| 264 | |
| 265 | if (dev->kthread_vid_out == NULL) |
| 266 | return; |
| 267 | |
| 268 | *pstreaming = false; |
| 269 | if (pstreaming == &dev->vid_out_streaming) { |
| 270 | /* Release all active buffers */ |
| 271 | while (!list_empty(&dev->vid_out_active)) { |
| 272 | struct vivid_buffer *buf; |
| 273 | |
| 274 | buf = list_entry(dev->vid_out_active.next, |
| 275 | struct vivid_buffer, list); |
| 276 | list_del(&buf->list); |
| 277 | vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR); |
| 278 | dprintk(dev, 2, "vid_out buffer %d done\n", |
| 279 | buf->vb.v4l2_buf.index); |
| 280 | } |
| 281 | } |
| 282 | |
| 283 | if (pstreaming == &dev->vbi_out_streaming) { |
| 284 | while (!list_empty(&dev->vbi_out_active)) { |
| 285 | struct vivid_buffer *buf; |
| 286 | |
| 287 | buf = list_entry(dev->vbi_out_active.next, |
| 288 | struct vivid_buffer, list); |
| 289 | list_del(&buf->list); |
| 290 | vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR); |
| 291 | dprintk(dev, 2, "vbi_out buffer %d done\n", |
| 292 | buf->vb.v4l2_buf.index); |
| 293 | } |
| 294 | } |
| 295 | |
| 296 | if (dev->vid_out_streaming || dev->vbi_out_streaming) |
| 297 | return; |
| 298 | |
| 299 | /* shutdown control thread */ |
| 300 | vivid_grab_controls(dev, false); |
| 301 | mutex_unlock(&dev->mutex); |
| 302 | kthread_stop(dev->kthread_vid_out); |
| 303 | dev->kthread_vid_out = NULL; |
| 304 | mutex_lock(&dev->mutex); |
| 305 | } |