demux.c 19.9 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11
/*****************************************************************************
 * demux.c : V4L2 raw video demux module for vlc
 *****************************************************************************
 * Copyright (C) 2002-2011 the VideoLAN team
 *
 * Authors: Benjamin Pracht <bigben at videolan dot org>
 *          Richard Hosking <richard at hovis dot net>
 *          Antoine Cellerier <dionoea at videolan d.t org>
 *          Dennis Lou <dlou99 at yahoo dot com>
 *
 * This program is free software; you can redistribute it and/or modify
Rémi Denis-Courmont's avatar
Rémi Denis-Courmont committed
12 13
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or
14 15 16 17 18
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
Rémi Denis-Courmont's avatar
Rémi Denis-Courmont committed
19
 * GNU Lesser General Public License for more details.
20
 *
Rémi Denis-Courmont's avatar
Rémi Denis-Courmont committed
21 22 23
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
24 25 26 27 28 29
 *****************************************************************************/

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

30
#include <math.h>
31
#include <errno.h>
32
#include <assert.h>
33
#include <fcntl.h>
34
#include <sys/ioctl.h>
Rémi Denis-Courmont's avatar
Rémi Denis-Courmont committed
35
#include <sys/mman.h>
36 37
#include <poll.h>

38
#include <vlc_common.h>
39 40 41
#include <vlc_demux.h>
#include <vlc_fs.h>

42 43
#include "v4l2.h"

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
/* TODO: remove this, use callbacks */
typedef enum {
    IO_METHOD_READ=1,
    IO_METHOD_MMAP,
} io_method;

struct demux_sys_t
{
    int fd;
    vlc_thread_t thread;

    /* Video */
    io_method io;

    struct buffer_t *bufv;
    union
    {
        uint32_t bufc;
        uint32_t blocksize;
    };
    uint32_t block_flags;

    es_out_id_t *es;
    vlc_v4l2_ctrl_t *controls;
};

70 71
static void *StreamThread (void *);
static void *ReadThread (void *);
72
static int DemuxControl( demux_t *, int, va_list );
73
static int InitVideo (demux_t *, int);
74 75 76 77

int DemuxOpen( vlc_object_t *obj )
{
    demux_t *demux = (demux_t *)obj;
78

79 80 81 82 83 84
    demux_sys_t *sys = calloc( 1, sizeof( demux_sys_t ) );
    if( unlikely(sys == NULL) )
        return VLC_ENOMEM;
    demux->p_sys = sys;

    ParseMRL( obj, demux->psz_location );
85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107

    char *path = var_InheritString (obj, CFG_PREFIX"dev");
    if (unlikely(path == NULL))
        goto error; /* probably OOM */
    msg_Dbg (obj, "opening device '%s'", path);

    int rawfd = vlc_open (path, O_RDWR);
    if (rawfd == -1)
    {
        msg_Err (obj, "cannot open device '%s': %m", path);
        free (path);
        goto error;
    }
    free (path);

    int fd = v4l2_fd_open (rawfd, 0);
    if (fd == -1)
    {
        msg_Warn (obj, "cannot initialize user-space library: %m");
        /* fallback to direct kernel mode anyway */
        fd = rawfd;
    }

108
    if (InitVideo (demux, fd))
109
    {
110 111
        v4l2_close (fd);
        goto error;
112 113
    }

114
    sys->fd = fd;
115
    sys->controls = ControlsInit (VLC_OBJECT(demux), fd);
116
    demux->pf_demux = NULL;
117 118 119 120 121
    demux->pf_control = DemuxControl;
    demux->info.i_update = 0;
    demux->info.i_title = 0;
    demux->info.i_seekpoint = 0;
    return VLC_SUCCESS;
122 123 124
error:
    free (sys);
    return VLC_EGENERIC;
125 126
}

127
typedef struct
128
{
129 130 131 132 133 134 135
    uint32_t v4l2;
    vlc_fourcc_t vlc;
    uint32_t red;
    uint32_t green;
    uint32_t blue;
} vlc_v4l2_fmt_t;

136 137
/* NOTE: Currently vlc_v4l2_fmt_rank() assumes format are sorted in order of
 * decreasing preference. */
138
static const vlc_v4l2_fmt_t v4l2_fmts[] =
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
    /* Planar YUV 4:2:0 */
    { V4L2_PIX_FMT_YUV420,   VLC_CODEC_I420, 0, 0, 0 },
    { V4L2_PIX_FMT_YVU420,   VLC_CODEC_YV12, 0, 0, 0 },
    { V4L2_PIX_FMT_YUV422P,  VLC_CODEC_I422, 0, 0, 0 },
    /* Packed YUV 4:2:2 */
    { V4L2_PIX_FMT_YUYV,     VLC_CODEC_YUYV, 0, 0, 0 },
    { V4L2_PIX_FMT_UYVY,     VLC_CODEC_UYVY, 0, 0, 0 },
    { V4L2_PIX_FMT_YVYU,     VLC_CODEC_YVYU, 0, 0, 0 },
    { V4L2_PIX_FMT_VYUY,     VLC_CODEC_VYUY, 0, 0, 0 },

    { V4L2_PIX_FMT_YUV411P,  VLC_CODEC_I411, 0, 0, 0 },

    { V4L2_PIX_FMT_YUV410,   VLC_CODEC_I410, 0, 0, 0 },
//  { V4L2_PIX_FMT_YVU410     },

//  { V4L2_PIX_FMT_NV24,      },
//  { V4L2_PIX_FMT_NV42,      },
//  { V4L2_PIX_FMT_NV16,     VLC_CODEC_NV16, 0, 0, 0 },
//  { V4L2_PIX_FMT_NV61,     VLC_CODEC_NV61, 0, 0, 0 },
    { V4L2_PIX_FMT_NV12,     VLC_CODEC_NV12, 0, 0, 0 },
    { V4L2_PIX_FMT_NV21,     VLC_CODEC_NV21, 0, 0, 0 },

    /* V4L2-documented but VLC-unsupported misc. YUV formats */
//  { V4L2_PIX_FMT_Y41P       },
//  { V4L2_PIX_FMT_NV12MT,    },
//  { V4L2_PIX_FMT_M420,      },

    /* Packed RGB */
#ifdef WORDS_BIGENDIAN
    { V4L2_PIX_FMT_RGB32,    VLC_CODEC_RGB32,   0xFF00, 0xFF0000, 0xFF000000 },
    { V4L2_PIX_FMT_BGR32,    VLC_CODEC_RGB32, 0xFF000000, 0xFF0000,   0xFF00 },
    { V4L2_PIX_FMT_RGB24,    VLC_CODEC_RGB24,   0xFF0000, 0x00FF00, 0x0000FF },
    { V4L2_PIX_FMT_BGR24,    VLC_CODEC_RGB24,   0x0000FF, 0x00FF00, 0xFF0000 },
//  { V4L2_PIX_FMT_BGR666,    },
//  { V4L2_PIX_FMT_RGB565,    },
    { V4L2_PIX_FMT_RGB565X,  VLC_CODEC_RGB16,     0x001F,   0x07E0,   0xF800 },
//  { V4L2_PIX_FMT_RGB555,    },
    { V4L2_PIX_FMT_RGB555X,  VLC_CODEC_RGB15,     0x001F,   0x03E0,   0x7C00 },
//  { V4L2_PIX_FMT_RGB444,   VLC_CODEC_RGB12,     0x000F,   0xF000,   0x0F00 },
#else
    { V4L2_PIX_FMT_RGB32,    VLC_CODEC_RGB32,   0x0000FF, 0x00FF00, 0xFF0000 },
    { V4L2_PIX_FMT_BGR32,    VLC_CODEC_RGB32,   0xFF0000, 0x00FF00, 0x0000FF },
    { V4L2_PIX_FMT_RGB24,    VLC_CODEC_RGB24,   0x0000FF, 0x00FF00, 0xFF0000 },
    { V4L2_PIX_FMT_BGR24,    VLC_CODEC_RGB24,   0xFF0000, 0x00FF00, 0x0000FF },
//  { V4L2_PIX_FMT_BGR666,    },
    { V4L2_PIX_FMT_RGB565,   VLC_CODEC_RGB16,     0x001F,   0x07E0,   0xF800 },
//  { V4L2_PIX_FMT_RGB565X,   },
    { V4L2_PIX_FMT_RGB555,   VLC_CODEC_RGB15,     0x001F,   0x03E0,   0x7C00 },
//  { V4L2_PIX_FMT_RGB555X,   },
//  { V4L2_PIX_FMT_RGB444,   VLC_CODEC_RGB12,     0x0F00,   0x00F0,   0x000F },
#endif
//  { V4L2_PIX_FMT_RGB332,   VLC_CODEC_RGB8,        0xC0,     0x38,     0x07 },

    /* Bayer (sub-sampled RGB). Not supported. */
//  { V4L2_PIX_FMT_SBGGR16,  }
//  { V4L2_PIX_FMT_SRGGB12,  }
//  { V4L2_PIX_FMT_SGRBG12,  }
//  { V4L2_PIX_FMT_SGBRG12,  }
//  { V4L2_PIX_FMT_SBGGR12,  }
//  { V4L2_PIX_FMT_SRGGB10,  }
//  { V4L2_PIX_FMT_SGRBG10,  }
//  { V4L2_PIX_FMT_SGBRG10,  }
//  { V4L2_PIX_FMT_SBGGR10,  }
//  { V4L2_PIX_FMT_SBGGR8,   }
//  { V4L2_PIX_FMT_SGBRG8,   }
//  { V4L2_PIX_FMT_SGRBG8,   }
//  { V4L2_PIX_FMT_SRGGB8,   }
207 208

    /* Compressed data types */
209
    { V4L2_PIX_FMT_JPEG,   VLC_CODEC_MJPG, 0, 0, 0 },
210
#ifdef V4L2_PIX_FMT_H264
211 212 213 214 215 216 217 218 219 220
    { V4L2_PIX_FMT_H264,   VLC_CODEC_H264, 0, 0, 0 },
    /* FIXME: fill p_extra for avc1... */
//  { V4L2_PIX_FMT_H264_NO_SC, VLC_FOURCC('a','v','c','1'), 0, 0, 0 }
    { V4L2_PIX_FMT_MPEG4,  VLC_CODEC_MP4V, 0, 0, 0 },
    { V4L2_PIX_FMT_XVID,   VLC_CODEC_MP4V, 0, 0, 0 },
    { V4L2_PIX_FMT_H263,   VLC_CODEC_H263, 0, 0, 0 },
    { V4L2_PIX_FMT_MPEG2,  VLC_CODEC_MPGV, 0, 0, 0 },
    { V4L2_PIX_FMT_MPEG1,  VLC_CODEC_MPGV, 0, 0, 0 },
    { V4L2_PIX_FMT_VC1_ANNEX_G, VLC_CODEC_VC1, 0, 0, 0 },
    { V4L2_PIX_FMT_VC1_ANNEX_L, VLC_CODEC_VC1, 0, 0, 0 },
221
#endif
222 223 224
    //V4L2_PIX_FMT_MPEG -> use access

    /* Reserved formats */
225
    { V4L2_PIX_FMT_MJPEG,   VLC_CODEC_MJPG, 0, 0, 0 },
226 227 228 229 230 231 232 233
    //V4L2_PIX_FMT_DV -> use access

    /* Grey scale */
//  { V4L2_PIX_FMT_Y16,       },
//  { V4L2_PIX_FMT_Y12,       },
//  { V4L2_PIX_FMT_Y10,       },
//  { V4L2_PIX_FMT_Y10BPACK,  },
    { V4L2_PIX_FMT_GREY,     VLC_CODEC_GREY, 0, 0, 0 },
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
static const vlc_v4l2_fmt_t *vlc_from_v4l2_fourcc (uint32_t fourcc)
{
     for (size_t i = 0; i < sizeof (v4l2_fmts) / sizeof (v4l2_fmts[0]); i++)
         if (v4l2_fmts[i].v4l2 == fourcc)
             return v4l2_fmts + i;
     return NULL;
}

static size_t vlc_v4l2_fmt_rank (const vlc_v4l2_fmt_t *fmt)
{
    if (fmt == NULL)
        return SIZE_MAX;

    ptrdiff_t d = fmt - v4l2_fmts;
    assert (d >= 0);
    assert (d < (ptrdiff_t)(sizeof (v4l2_fmts) / sizeof (v4l2_fmts[0])));
    return d;
}

static vlc_fourcc_t var_InheritFourCC (vlc_object_t *obj, const char *varname)
{
    char *str = var_InheritString (obj, varname);
    if (str == NULL)
        return 0;

    vlc_fourcc_t fourcc = vlc_fourcc_GetCodecFromString (VIDEO_ES, str);
    if (fourcc == 0)
        msg_Err (obj, "invalid codec %s", str);
    free (str);
    return fourcc;
}
#define var_InheritFourCC(o, v) var_InheritFourCC(VLC_OBJECT(o), v)

269 270 271 272 273 274 275 276 277 278 279 280 281 282
static void GetAR (int fd, unsigned *restrict num, unsigned *restrict den)
{
    struct v4l2_cropcap cropcap = { .type = V4L2_BUF_TYPE_VIDEO_CAPTURE };

    /* TODO: get CROPCAP only once (see ResetCrop()). */
    if (v4l2_ioctl (fd, VIDIOC_CROPCAP, &cropcap) < 0)
    {
        *num = *den = 1;
        return;
    }
    *num = cropcap.pixelaspect.numerator;
    *den = cropcap.pixelaspect.denominator;
}

283 284 285 286 287 288 289 290 291 292 293 294 295 296 297
static int InitVideo (demux_t *demux, int fd)
{
    demux_sys_t *sys = demux->p_sys;

    /* Get device capabilites */
    struct v4l2_capability cap;
    if (v4l2_ioctl (fd, VIDIOC_QUERYCAP, &cap) < 0)
    {
        msg_Err (demux, "cannot get device capabilities: %m");
        return -1;
    }

    msg_Dbg (demux, "device %s using driver %s (version %u.%u.%u) on %s",
            cap.card, cap.driver, (cap.version >> 16) & 0xFF,
            (cap.version >> 8) & 0xFF, cap.version & 0xFF, cap.bus_info);
298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314

    uint32_t caps;
#ifdef V4L2_CAP_DEVICE_CAPS
    if (cap.capabilities & V4L2_CAP_DEVICE_CAPS)
    {
        msg_Dbg (demux, " with capabilities 0x%08"PRIX32" "
                 "(overall 0x%08"PRIX32")", cap.device_caps, cap.capabilities);
        caps = cap.device_caps;
    }
    else
#endif
    {
        msg_Dbg (demux, " with unknown capabilities  "
                 "(overall 0x%08"PRIX32")", cap.capabilities);
        caps = cap.capabilities;
    }
    if (!(caps & V4L2_CAP_VIDEO_CAPTURE))
315 316 317 318 319 320 321 322
    {
        msg_Err (demux, "not a video capture device");
        return -1;
    }

    if (SetupInput (VLC_OBJECT(demux), fd))
        return -1;

323 324 325 326
    /* Picture format negotiation */
    const vlc_v4l2_fmt_t *selected = NULL;
    vlc_fourcc_t reqfourcc = var_InheritFourCC (demux, CFG_PREFIX"chroma");
    bool native = false;
327

328 329 330 331 332
    for (struct v4l2_fmtdesc codec = { .type = V4L2_BUF_TYPE_VIDEO_CAPTURE };
         v4l2_ioctl (fd, VIDIOC_ENUM_FMT, &codec) >= 0;
         codec.index++)
    {   /* Enumerate available chromas */
        const vlc_v4l2_fmt_t *dsc = vlc_from_v4l2_fourcc (codec.pixelformat);
333

334 335 336 337 338 339
        msg_Dbg (demux, " %s %s format %4.4s (%4.4s): %s",
              (codec.flags & V4L2_FMT_FLAG_EMULATED) ? "emulates" : "supports",
              (codec.flags & V4L2_FMT_FLAG_COMPRESSED) ? "compressed" : "raw",
                 (char *)&codec.pixelformat,
                 (dsc != NULL) ? (const char *)&dsc->vlc : "N.A.",
                 codec.description);
340

341 342
        if (dsc == NULL)
            continue; /* ignore VLC-unsupported codec */
343

344 345 346 347 348 349 350
        if (dsc->vlc == reqfourcc)
        {
            msg_Dbg (demux, "  matches the requested format");
            selected = dsc;
            break; /* always select the requested format if found */
        }

351 352 353 354
        if (codec.flags & V4L2_FMT_FLAG_EMULATED)
        {
            if (native)
                continue; /* ignore emulated format if possible */
355
        }
356 357
        else
            native = true;
358

359 360
        if (vlc_v4l2_fmt_rank (dsc) > vlc_v4l2_fmt_rank (selected))
            continue; /* ignore if rank is worse */
361

362
        selected = dsc;
363
    }
364 365

    if (selected == NULL)
366
    {
367 368
        msg_Err (demux, "cannot negotiate supported video format");
        return -1;
369
    }
370 371
    msg_Dbg (demux, "selected format %4.4s (%4.4s)",
             (const char *)&selected->v4l2, (const char *)&selected->vlc);
372

373 374 375 376
    /* Find best resolution and frame rate available */
    struct v4l2_format fmt;
    struct v4l2_streamparm parm;
    if (SetupFormat (demux, fd, selected->v4l2, &fmt, &parm))
377
        return -1;
378

379
#if 0
380 381 382 383 384 385
    uint32_t width = var_InheritInteger (demux, CFG_PREFIX"width");
    if (width != (uint32_t)-1)
        fmt.fmt.pix.width = width; /* override width */
    uint32_t height = var_InheritInteger (demux, CFG_PREFIX"height");
    if (height != (uint32_t)-1)
        fmt.fmt.pix.height = height; /* override height */
386
#endif
387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405

    /* Print extra info */
    msg_Dbg (demux, "%d bytes maximum for complete image",
             fmt.fmt.pix.sizeimage);
    /* Check interlacing */
    switch (fmt.fmt.pix.field)
    {
        case V4L2_FIELD_NONE:
            msg_Dbg (demux, "Interlacing setting: progressive");
            break;
        case V4L2_FIELD_TOP:
            msg_Dbg (demux, "Interlacing setting: top field only");
            break;
        case V4L2_FIELD_BOTTOM:
            msg_Dbg (demux, "Interlacing setting: bottom field only");
            break;
        case V4L2_FIELD_INTERLACED:
            msg_Dbg (demux, "Interlacing setting: interleaved");
            /*if (NTSC)
406
                sys->block_flags = BLOCK_FLAG_BOTTOM_FIELD_FIRST;
407
            else*/
408
                sys->block_flags = BLOCK_FLAG_TOP_FIELD_FIRST;
409 410 411 412 413 414 415 416 417
            break;
        case V4L2_FIELD_SEQ_TB:
            msg_Dbg (demux, "Interlacing setting: sequential top bottom (TODO)");
            break;
        case V4L2_FIELD_SEQ_BT:
            msg_Dbg (demux, "Interlacing setting: sequential bottom top (TODO)");
            break;
        case V4L2_FIELD_ALTERNATE:
            msg_Dbg (demux, "Interlacing setting: alternate fields (TODO)");
418
            fmt.fmt.pix.height *= 2;
419 420 421
            break;
        case V4L2_FIELD_INTERLACED_TB:
            msg_Dbg (demux, "Interlacing setting: interleaved top bottom");
422
            sys->block_flags = BLOCK_FLAG_TOP_FIELD_FIRST;
423 424 425
            break;
        case V4L2_FIELD_INTERLACED_BT:
            msg_Dbg (demux, "Interlacing setting: interleaved bottom top");
426
            sys->block_flags = BLOCK_FLAG_BOTTOM_FIELD_FIRST;
427 428 429 430 431 432 433
            break;
        default:
            msg_Warn (demux, "Interlacing setting: unknown type (%d)",
                      fmt.fmt.pix.field);
            break;
    }

434
    /* Declare our unique elementary (video) stream */
435
    es_format_t es_fmt;
436

437 438 439 440
    es_format_Init (&es_fmt, VIDEO_ES, selected->vlc);
    es_fmt.video.i_rmask = selected->red;
    es_fmt.video.i_gmask = selected->green;
    es_fmt.video.i_bmask = selected->blue;
441 442 443 444
    es_fmt.video.i_width = fmt.fmt.pix.width;
    es_fmt.video.i_height = fmt.fmt.pix.height;
    es_fmt.video.i_frame_rate = parm.parm.capture.timeperframe.denominator;
    es_fmt.video.i_frame_rate_base = parm.parm.capture.timeperframe.numerator;
445
    GetAR (fd, &es_fmt.video.i_sar_num, &es_fmt.video.i_sar_den);
446

447
    msg_Dbg (demux, "added new video ES %4.4s %ux%u", (char *)&es_fmt.i_codec,
448 449 450
             es_fmt.video.i_width, es_fmt.video.i_height);
    msg_Dbg (demux, " frame rate: %u/%u", es_fmt.video.i_frame_rate,
             es_fmt.video.i_frame_rate_base);
451 452
    msg_Dbg (demux, " aspect ratio: %u/%u", es_fmt.video.i_sar_num,
             es_fmt.video.i_sar_den);
453
    sys->es = es_out_Add (demux->out, &es_fmt);
454 455

    /* Init I/O method */
456 457
    void *(*entry) (void *);
    if (caps & V4L2_CAP_STREAMING)
458
    {
459 460
        sys->bufv = InitMmap (VLC_OBJECT(demux), fd, &sys->bufc);
        if (sys->bufv == NULL)
461
            return -1;
462
        for (uint32_t i = 0; i < sys->bufc; i++)
463 464 465 466 467 468 469 470 471 472 473 474 475 476
        {
            struct v4l2_buffer buf = {
                .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
                .memory = V4L2_MEMORY_MMAP,
                .index = i,
            };

            if (v4l2_ioctl (fd, VIDIOC_QBUF, &buf) < 0)
            {
                msg_Err (demux, "cannot queue buffer: %m");
                return -1;
            }
        }

477
        enum v4l2_buf_type buf_type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
478 479 480 481 482 483
        if (v4l2_ioctl (fd, VIDIOC_STREAMON, &buf_type) < 0)
        {
            msg_Err (demux, "cannot start streaming: %m");
            return -1;
        }

484 485 486 487 488 489 490 491 492 493 494 495 496
        sys->io = IO_METHOD_MMAP;
        entry = StreamThread;
    }
    else if (caps & V4L2_CAP_READWRITE)
    {
        sys->blocksize = fmt.fmt.pix.sizeimage;
        sys->io = IO_METHOD_READ;
        entry = ReadThread;
    }
    else
    {
        msg_Err (demux, "no supported I/O method");
        return -1;
497 498
    }

499 500
    if (vlc_clone (&sys->thread, entry, demux, VLC_THREAD_PRIORITY_INPUT))
        return -1;
501 502 503
    return 0;
}

504 505 506 507
void DemuxClose( vlc_object_t *obj )
{
    demux_t *demux = (demux_t *)obj;
    demux_sys_t *sys = demux->p_sys;
508
    int fd = sys->fd;
509

510 511 512
    vlc_cancel (sys->thread);
    vlc_join (sys->thread, NULL);

513 514 515 516 517 518 519 520 521 522 523
    /* Stop video capture */
    switch( sys->io )
    {
        case IO_METHOD_READ:
            /* Nothing to do */
            break;

        case IO_METHOD_MMAP:
        {
            /* NOTE: Some buggy drivers hang if buffers are not unmapped before
             * streamoff */
524
            for (uint32_t i = 0; i < sys->bufc; i++)
525 526 527
            {
                struct v4l2_buffer buf = {
                    .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
528
                    .memory = V4L2_MEMORY_MMAP,
529
                };
530 531
                v4l2_ioctl (fd, VIDIOC_DQBUF, &buf);
                v4l2_munmap (sys->bufv[i].start, sys->bufv[i].length);
532 533
            }
            enum v4l2_buf_type buf_type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
534
            v4l2_ioctl (fd, VIDIOC_STREAMOFF, &buf_type);
535
            free (sys->bufv);
536 537 538 539
            break;
        }
    }

540
    ControlsDeinit( obj, sys->controls );
541 542 543 544
    v4l2_close( fd );
    free( sys );
}

545 546 547 548
static void *StreamThread (void *data)
{
    demux_t *demux = data;
    demux_sys_t *sys = demux->p_sys;
549
    int fd = sys->fd;
550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565
    struct pollfd ufd[1];

    ufd[0].fd = fd;
    ufd[0].events = POLLIN | POLLPRI;

    for (;;)
    {
        /* Wait for data */
        if (poll (ufd, 1, -1) == -1)
        {
           if (errno != EINTR)
               msg_Err (demux, "poll error: %m");
           continue;
        }

        int canc = vlc_savecancel ();
566
        block_t *block = GrabVideo (VLC_OBJECT(demux), fd, sys->bufv);
567 568 569
        if (block != NULL)
        {
            block->i_pts = block->i_dts = mdate ();
570
            block->i_flags |= sys->block_flags;
571
            es_out_Control (demux->out, ES_OUT_SET_PCR, block->i_pts);
572
            es_out_Send (demux->out, sys->es, block);
573 574 575 576 577 578 579 580 581 582 583
        }
        vlc_restorecancel (canc);
    }

    assert (0);
}

static void *ReadThread (void *data)
{
    demux_t *demux = data;
    demux_sys_t *sys = demux->p_sys;
584
    int fd = sys->fd;
585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607
    struct pollfd ufd[1];

    ufd[0].fd = fd;
    ufd[0].events = POLLIN | POLLPRI;

    for (;;)
    {
        /* Wait for data */
        if (poll (ufd, 1, -1) == -1)
        {
           if (errno != EINTR)
               msg_Err (demux, "poll error: %m");
           continue;
        }

        block_t *block = block_Alloc (sys->blocksize);
        if (unlikely(block == NULL))
        {
            msg_Err (demux, "read error: %m");
            v4l2_read (fd, NULL, 0); /* discard frame */
            continue;
        }
        block->i_pts = block->i_dts = mdate ();
608
        block->i_flags |= sys->block_flags;
609 610 611 612 613 614 615

        int canc = vlc_savecancel ();
        ssize_t val = v4l2_read (fd, block->p_buffer, block->i_buffer);
        if (val != -1)
        {
            block->i_buffer = val;
            es_out_Control (demux->out, ES_OUT_SET_PCR, block->i_pts);
616
            es_out_Send (demux->out, sys->es, block);
617 618 619 620 621 622 623 624
        }
        else
            block_Release (block);
        vlc_restorecancel (canc);
    }
    assert (0);
}

625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651
static int DemuxControl( demux_t *demux, int query, va_list args )
{
    switch( query )
    {
        /* Special for access_demux */
        case DEMUX_CAN_PAUSE:
        case DEMUX_CAN_SEEK:
        case DEMUX_CAN_CONTROL_PACE:
            *va_arg( args, bool * ) = false;
            return VLC_SUCCESS;

        case DEMUX_GET_PTS_DELAY:
            *va_arg(args,int64_t *) = INT64_C(1000)
                * var_InheritInteger( demux, "live-caching" );
            return VLC_SUCCESS;

        case DEMUX_GET_TIME:
            *va_arg( args, int64_t * ) = mdate();
            return VLC_SUCCESS;

        /* TODO implement others */
        default:
            return VLC_EGENERIC;
    }

    return VLC_EGENERIC;
}