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libavdevice/v4l2.c

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00001 /*
00002  * Video4Linux2 grab interface
00003  * Copyright (c) 2000,2001 Fabrice Bellard
00004  * Copyright (c) 2006 Luca Abeni
00005  *
00006  * Part of this file is based on the V4L2 video capture example
00007  * (http://v4l2spec.bytesex.org/v4l2spec/capture.c)
00008  *
00009  * Thanks to Michael Niedermayer for providing the mapping between
00010  * V4L2_PIX_FMT_* and PIX_FMT_*
00011  *
00012  *
00013  * This file is part of FFmpeg.
00014  *
00015  * FFmpeg is free software; you can redistribute it and/or
00016  * modify it under the terms of the GNU Lesser General Public
00017  * License as published by the Free Software Foundation; either
00018  * version 2.1 of the License, or (at your option) any later version.
00019  *
00020  * FFmpeg is distributed in the hope that it will be useful,
00021  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00022  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00023  * Lesser General Public License for more details.
00024  *
00025  * You should have received a copy of the GNU Lesser General Public
00026  * License along with FFmpeg; if not, write to the Free Software
00027  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00028  */
00029 
00030 #undef __STRICT_ANSI__ //workaround due to broken kernel headers
00031 #include "config.h"
00032 #include "libavformat/avformat.h"
00033 #include <unistd.h>
00034 #include <fcntl.h>
00035 #include <sys/ioctl.h>
00036 #include <sys/mman.h>
00037 #include <sys/time.h>
00038 #if HAVE_SYS_VIDEOIO_H
00039 #include <sys/videoio.h>
00040 #else
00041 #include <asm/types.h>
00042 #include <linux/videodev2.h>
00043 #endif
00044 #include <time.h>
00045 #include <strings.h>
00046 
00047 static const int desired_video_buffers = 256;
00048 
00049 enum io_method {
00050     io_read,
00051     io_mmap,
00052     io_userptr
00053 };
00054 
00055 struct video_data {
00056     int fd;
00057     int frame_format; /* V4L2_PIX_FMT_* */
00058     enum io_method io_method;
00059     int width, height;
00060     int frame_size;
00061     int top_field_first;
00062 
00063     int buffers;
00064     void **buf_start;
00065     unsigned int *buf_len;
00066 };
00067 
00068 struct buff_data {
00069     int index;
00070     int fd;
00071 };
00072 
00073 struct fmt_map {
00074     enum PixelFormat ff_fmt;
00075     int32_t v4l2_fmt;
00076 };
00077 
00078 static struct fmt_map fmt_conversion_table[] = {
00079     {
00080         .ff_fmt = PIX_FMT_YUV420P,
00081         .v4l2_fmt = V4L2_PIX_FMT_YUV420,
00082     },
00083     {
00084         .ff_fmt = PIX_FMT_YUV422P,
00085         .v4l2_fmt = V4L2_PIX_FMT_YUV422P,
00086     },
00087     {
00088         .ff_fmt = PIX_FMT_YUYV422,
00089         .v4l2_fmt = V4L2_PIX_FMT_YUYV,
00090     },
00091     {
00092         .ff_fmt = PIX_FMT_UYVY422,
00093         .v4l2_fmt = V4L2_PIX_FMT_UYVY,
00094     },
00095     {
00096         .ff_fmt = PIX_FMT_YUV411P,
00097         .v4l2_fmt = V4L2_PIX_FMT_YUV411P,
00098     },
00099     {
00100         .ff_fmt = PIX_FMT_YUV410P,
00101         .v4l2_fmt = V4L2_PIX_FMT_YUV410,
00102     },
00103     {
00104         .ff_fmt = PIX_FMT_RGB555,
00105         .v4l2_fmt = V4L2_PIX_FMT_RGB555,
00106     },
00107     {
00108         .ff_fmt = PIX_FMT_RGB565,
00109         .v4l2_fmt = V4L2_PIX_FMT_RGB565,
00110     },
00111     {
00112         .ff_fmt = PIX_FMT_BGR24,
00113         .v4l2_fmt = V4L2_PIX_FMT_BGR24,
00114     },
00115     {
00116         .ff_fmt = PIX_FMT_RGB24,
00117         .v4l2_fmt = V4L2_PIX_FMT_RGB24,
00118     },
00119     {
00120         .ff_fmt = PIX_FMT_BGRA,
00121         .v4l2_fmt = V4L2_PIX_FMT_BGR32,
00122     },
00123     {
00124         .ff_fmt = PIX_FMT_GRAY8,
00125         .v4l2_fmt = V4L2_PIX_FMT_GREY,
00126     },
00127 };
00128 
00129 static int device_open(AVFormatContext *ctx, uint32_t *capabilities)
00130 {
00131     struct v4l2_capability cap;
00132     int fd;
00133     int res;
00134     int flags = O_RDWR;
00135 
00136     if (ctx->flags & AVFMT_FLAG_NONBLOCK) {
00137         flags |= O_NONBLOCK;
00138     }
00139     fd = open(ctx->filename, flags, 0);
00140     if (fd < 0) {
00141         av_log(ctx, AV_LOG_ERROR, "Cannot open video device %s : %s\n",
00142                  ctx->filename, strerror(errno));
00143 
00144         return -1;
00145     }
00146 
00147     res = ioctl(fd, VIDIOC_QUERYCAP, &cap);
00148     // ENOIOCTLCMD definition only availble on __KERNEL__
00149     if (res < 0 && errno == 515)
00150     {
00151         av_log(ctx, AV_LOG_ERROR, "QUERYCAP not implemented, probably V4L device but not supporting V4L2\n");
00152         close(fd);
00153 
00154         return -1;
00155     }
00156     if (res < 0) {
00157         av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYCAP): %s\n",
00158                  strerror(errno));
00159         close(fd);
00160 
00161         return -1;
00162     }
00163     if ((cap.capabilities & V4L2_CAP_VIDEO_CAPTURE) == 0) {
00164         av_log(ctx, AV_LOG_ERROR, "Not a video capture device\n");
00165         close(fd);
00166 
00167         return -1;
00168     }
00169     *capabilities = cap.capabilities;
00170 
00171     return fd;
00172 }
00173 
00174 static int device_init(AVFormatContext *ctx, int *width, int *height, int pix_fmt)
00175 {
00176     struct video_data *s = ctx->priv_data;
00177     int fd = s->fd;
00178     struct v4l2_format fmt;
00179     int res;
00180 
00181     memset(&fmt, 0, sizeof(struct v4l2_format));
00182     fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
00183     fmt.fmt.pix.width = *width;
00184     fmt.fmt.pix.height = *height;
00185     fmt.fmt.pix.pixelformat = pix_fmt;
00186     fmt.fmt.pix.field = V4L2_FIELD_INTERLACED;
00187     res = ioctl(fd, VIDIOC_S_FMT, &fmt);
00188     if ((*width != fmt.fmt.pix.width) || (*height != fmt.fmt.pix.height)) {
00189         av_log(ctx, AV_LOG_INFO, "The V4L2 driver changed the video from %dx%d to %dx%d\n", *width, *height, fmt.fmt.pix.width, fmt.fmt.pix.height);
00190         *width = fmt.fmt.pix.width;
00191         *height = fmt.fmt.pix.height;
00192     }
00193 
00194     if (pix_fmt != fmt.fmt.pix.pixelformat) {
00195         av_log(ctx, AV_LOG_DEBUG, "The V4L2 driver changed the pixel format from 0x%08X to 0x%08X\n", pix_fmt, fmt.fmt.pix.pixelformat);
00196         res = -1;
00197     }
00198 
00199     return res;
00200 }
00201 
00202 static int first_field(int fd)
00203 {
00204     int res;
00205     v4l2_std_id std;
00206 
00207     res = ioctl(fd, VIDIOC_G_STD, &std);
00208     if (res < 0) {
00209         return 0;
00210     }
00211     if (std & V4L2_STD_NTSC) {
00212         return 0;
00213     }
00214 
00215     return 1;
00216 }
00217 
00218 static uint32_t fmt_ff2v4l(enum PixelFormat pix_fmt)
00219 {
00220     int i;
00221 
00222     for (i = 0; i < FF_ARRAY_ELEMS(fmt_conversion_table); i++) {
00223         if (fmt_conversion_table[i].ff_fmt == pix_fmt) {
00224             return fmt_conversion_table[i].v4l2_fmt;
00225         }
00226     }
00227 
00228     return 0;
00229 }
00230 
00231 static enum PixelFormat fmt_v4l2ff(uint32_t pix_fmt)
00232 {
00233     int i;
00234 
00235     for (i = 0; i < FF_ARRAY_ELEMS(fmt_conversion_table); i++) {
00236         if (fmt_conversion_table[i].v4l2_fmt == pix_fmt) {
00237             return fmt_conversion_table[i].ff_fmt;
00238         }
00239     }
00240 
00241     return PIX_FMT_NONE;
00242 }
00243 
00244 static int mmap_init(AVFormatContext *ctx)
00245 {
00246     struct video_data *s = ctx->priv_data;
00247     struct v4l2_requestbuffers req;
00248     int i, res;
00249 
00250     memset(&req, 0, sizeof(struct v4l2_requestbuffers));
00251     req.count = desired_video_buffers;
00252     req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
00253     req.memory = V4L2_MEMORY_MMAP;
00254     res = ioctl (s->fd, VIDIOC_REQBUFS, &req);
00255     if (res < 0) {
00256         if (errno == EINVAL) {
00257             av_log(ctx, AV_LOG_ERROR, "Device does not support mmap\n");
00258         } else {
00259             av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_REQBUFS)\n");
00260         }
00261 
00262         return -1;
00263     }
00264 
00265     if (req.count < 2) {
00266         av_log(ctx, AV_LOG_ERROR, "Insufficient buffer memory\n");
00267 
00268         return -1;
00269     }
00270     s->buffers = req.count;
00271     s->buf_start = av_malloc(sizeof(void *) * s->buffers);
00272     if (s->buf_start == NULL) {
00273         av_log(ctx, AV_LOG_ERROR, "Cannot allocate buffer pointers\n");
00274 
00275         return -1;
00276     }
00277     s->buf_len = av_malloc(sizeof(unsigned int) * s->buffers);
00278     if (s->buf_len == NULL) {
00279         av_log(ctx, AV_LOG_ERROR, "Cannot allocate buffer sizes\n");
00280         av_free(s->buf_start);
00281 
00282         return -1;
00283     }
00284 
00285     for (i = 0; i < req.count; i++) {
00286         struct v4l2_buffer buf;
00287 
00288         memset(&buf, 0, sizeof(struct v4l2_buffer));
00289         buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
00290         buf.memory = V4L2_MEMORY_MMAP;
00291         buf.index = i;
00292         res = ioctl (s->fd, VIDIOC_QUERYBUF, &buf);
00293         if (res < 0) {
00294             av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYBUF)\n");
00295 
00296             return -1;
00297         }
00298 
00299         s->buf_len[i] = buf.length;
00300         if (s->buf_len[i] < s->frame_size) {
00301             av_log(ctx, AV_LOG_ERROR, "Buffer len [%d] = %d != %d\n", i, s->buf_len[i], s->frame_size);
00302 
00303             return -1;
00304         }
00305         s->buf_start[i] = mmap (NULL, buf.length,
00306                         PROT_READ | PROT_WRITE, MAP_SHARED, s->fd, buf.m.offset);
00307         if (s->buf_start[i] == MAP_FAILED) {
00308             av_log(ctx, AV_LOG_ERROR, "mmap: %s\n", strerror(errno));
00309 
00310             return -1;
00311         }
00312     }
00313 
00314     return 0;
00315 }
00316 
00317 static int read_init(AVFormatContext *ctx)
00318 {
00319     return -1;
00320 }
00321 
00322 static void mmap_release_buffer(AVPacket *pkt)
00323 {
00324     struct v4l2_buffer buf;
00325     int res, fd;
00326     struct buff_data *buf_descriptor = pkt->priv;
00327 
00328     if (pkt->data == NULL) {
00329          return;
00330     }
00331 
00332     memset(&buf, 0, sizeof(struct v4l2_buffer));
00333     buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
00334     buf.memory = V4L2_MEMORY_MMAP;
00335     buf.index = buf_descriptor->index;
00336     fd = buf_descriptor->fd;
00337     av_free(buf_descriptor);
00338 
00339     res = ioctl (fd, VIDIOC_QBUF, &buf);
00340     if (res < 0) {
00341         av_log(NULL, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF)\n");
00342     }
00343     pkt->data = NULL;
00344     pkt->size = 0;
00345 }
00346 
00347 static int mmap_read_frame(AVFormatContext *ctx, AVPacket *pkt)
00348 {
00349     struct video_data *s = ctx->priv_data;
00350     struct v4l2_buffer buf;
00351     struct buff_data *buf_descriptor;
00352     int res;
00353 
00354     memset(&buf, 0, sizeof(struct v4l2_buffer));
00355     buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
00356     buf.memory = V4L2_MEMORY_MMAP;
00357 
00358     /* FIXME: Some special treatment might be needed in case of loss of signal... */
00359     while ((res = ioctl(s->fd, VIDIOC_DQBUF, &buf)) < 0 && (errno == EINTR));
00360     if (res < 0) {
00361         if (errno == EAGAIN) {
00362             pkt->size = 0;
00363 
00364             return AVERROR(EAGAIN);
00365         }
00366         av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_DQBUF): %s\n", strerror(errno));
00367 
00368         return -1;
00369     }
00370     assert (buf.index < s->buffers);
00371     if (buf.bytesused != s->frame_size) {
00372         av_log(ctx, AV_LOG_ERROR, "The v4l2 frame is %d bytes, but %d bytes are expected\n", buf.bytesused, s->frame_size);
00373 
00374         return -1;
00375     }
00376 
00377     /* Image is at s->buff_start[buf.index] */
00378     pkt->data= s->buf_start[buf.index];
00379     pkt->size = buf.bytesused;
00380     pkt->pts = buf.timestamp.tv_sec * INT64_C(1000000) + buf.timestamp.tv_usec;
00381     pkt->destruct = mmap_release_buffer;
00382     buf_descriptor = av_malloc(sizeof(struct buff_data));
00383     if (buf_descriptor == NULL) {
00384         /* Something went wrong... Since av_malloc() failed, we cannot even
00385          * allocate a buffer for memcopying into it
00386          */
00387         av_log(ctx, AV_LOG_ERROR, "Failed to allocate a buffer descriptor\n");
00388         res = ioctl (s->fd, VIDIOC_QBUF, &buf);
00389 
00390         return -1;
00391     }
00392     buf_descriptor->fd = s->fd;
00393     buf_descriptor->index = buf.index;
00394     pkt->priv = buf_descriptor;
00395 
00396     return s->buf_len[buf.index];
00397 }
00398 
00399 static int read_frame(AVFormatContext *ctx, AVPacket *pkt)
00400 {
00401     return -1;
00402 }
00403 
00404 static int mmap_start(AVFormatContext *ctx)
00405 {
00406     struct video_data *s = ctx->priv_data;
00407     enum v4l2_buf_type type;
00408     int i, res;
00409 
00410     for (i = 0; i < s->buffers; i++) {
00411         struct v4l2_buffer buf;
00412 
00413         memset(&buf, 0, sizeof(struct v4l2_buffer));
00414         buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
00415         buf.memory = V4L2_MEMORY_MMAP;
00416         buf.index  = i;
00417 
00418         res = ioctl (s->fd, VIDIOC_QBUF, &buf);
00419         if (res < 0) {
00420             av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF): %s\n", strerror(errno));
00421 
00422             return -1;
00423         }
00424     }
00425 
00426     type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
00427     res = ioctl (s->fd, VIDIOC_STREAMON, &type);
00428     if (res < 0) {
00429         av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_STREAMON): %s\n", strerror(errno));
00430 
00431         return -1;
00432     }
00433 
00434     return 0;
00435 }
00436 
00437 static void mmap_close(struct video_data *s)
00438 {
00439     enum v4l2_buf_type type;
00440     int i;
00441 
00442     type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
00443     /* We do not check for the result, because we could
00444      * not do anything about it anyway...
00445      */
00446     ioctl(s->fd, VIDIOC_STREAMOFF, &type);
00447     for (i = 0; i < s->buffers; i++) {
00448         munmap(s->buf_start[i], s->buf_len[i]);
00449     }
00450     av_free(s->buf_start);
00451     av_free(s->buf_len);
00452 }
00453 
00454 static int v4l2_set_parameters( AVFormatContext *s1, AVFormatParameters *ap )
00455 {
00456     struct video_data *s = s1->priv_data;
00457     struct v4l2_input input;
00458     struct v4l2_standard standard;
00459     int i;
00460 
00461     if(ap->channel>=0) {
00462         /* set tv video input */
00463         memset (&input, 0, sizeof (input));
00464         input.index = ap->channel;
00465         if(ioctl (s->fd, VIDIOC_ENUMINPUT, &input) < 0) {
00466             av_log(s1, AV_LOG_ERROR, "The V4L2 driver ioctl enum input failed:\n");
00467             return AVERROR(EIO);
00468         }
00469 
00470         av_log(s1, AV_LOG_DEBUG, "The V4L2 driver set input_id: %d, input: %s\n",
00471                ap->channel, input.name);
00472         if(ioctl (s->fd, VIDIOC_S_INPUT, &input.index) < 0 ) {
00473             av_log(s1, AV_LOG_ERROR, "The V4L2 driver ioctl set input(%d) failed\n",
00474                    ap->channel);
00475             return AVERROR(EIO);
00476         }
00477     }
00478 
00479     if(ap->standard) {
00480         av_log(s1, AV_LOG_DEBUG, "The V4L2 driver set standard: %s\n",
00481                ap->standard );
00482         /* set tv standard */
00483         memset (&standard, 0, sizeof (standard));
00484         for(i=0;;i++) {
00485             standard.index = i;
00486             if (ioctl(s->fd, VIDIOC_ENUMSTD, &standard) < 0) {
00487                 av_log(s1, AV_LOG_ERROR, "The V4L2 driver ioctl set standard(%s) failed\n",
00488                        ap->standard);
00489                 return AVERROR(EIO);
00490             }
00491 
00492             if(!strcasecmp(standard.name, ap->standard)) {
00493                 break;
00494             }
00495         }
00496 
00497         av_log(s1, AV_LOG_DEBUG, "The V4L2 driver set standard: %s, id: %"PRIu64"\n",
00498                ap->standard, (uint64_t)standard.id);
00499         if (ioctl(s->fd, VIDIOC_S_STD, &standard.id) < 0) {
00500             av_log(s1, AV_LOG_ERROR, "The V4L2 driver ioctl set standard(%s) failed\n",
00501                    ap->standard);
00502             return AVERROR(EIO);
00503         }
00504     }
00505 
00506     return 0;
00507 }
00508 
00509 static int v4l2_read_header(AVFormatContext *s1, AVFormatParameters *ap)
00510 {
00511     struct video_data *s = s1->priv_data;
00512     AVStream *st;
00513     int width, height;
00514     int res;
00515     uint32_t desired_format, capabilities;
00516 
00517     if (ap->width <= 0 || ap->height <= 0) {
00518         av_log(s1, AV_LOG_ERROR, "Wrong size (%dx%d)\n", ap->width, ap->height);
00519         return -1;
00520     }
00521 
00522     width = ap->width;
00523     height = ap->height;
00524 
00525     if(avcodec_check_dimensions(s1, ap->width, ap->height) < 0)
00526         return -1;
00527 
00528     st = av_new_stream(s1, 0);
00529     if (!st) {
00530         return AVERROR(ENOMEM);
00531     }
00532     av_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */
00533 
00534     s->width = width;
00535     s->height = height;
00536 
00537     capabilities = 0;
00538     s->fd = device_open(s1, &capabilities);
00539     if (s->fd < 0) {
00540         return AVERROR(EIO);
00541     }
00542     av_log(s1, AV_LOG_INFO, "[%d]Capabilities: %x\n", s->fd, capabilities);
00543 
00544     desired_format = fmt_ff2v4l(ap->pix_fmt);
00545     if (desired_format == 0 || (device_init(s1, &width, &height, desired_format) < 0)) {
00546         int i, done;
00547 
00548         done = 0; i = 0;
00549         while (!done) {
00550             desired_format = fmt_conversion_table[i].v4l2_fmt;
00551             if (device_init(s1, &width, &height, desired_format) < 0) {
00552                 desired_format = 0;
00553                 i++;
00554             } else {
00555                done = 1;
00556             }
00557             if (i == FF_ARRAY_ELEMS(fmt_conversion_table)) {
00558                done = 1;
00559             }
00560         }
00561     }
00562     if (desired_format == 0) {
00563         av_log(s1, AV_LOG_ERROR, "Cannot find a proper format.\n");
00564         close(s->fd);
00565 
00566         return AVERROR(EIO);
00567     }
00568     s->frame_format = desired_format;
00569 
00570     if( v4l2_set_parameters( s1, ap ) < 0 )
00571         return AVERROR(EIO);
00572 
00573     st->codec->pix_fmt = fmt_v4l2ff(desired_format);
00574     s->frame_size = avpicture_get_size(st->codec->pix_fmt, width, height);
00575     if (capabilities & V4L2_CAP_STREAMING) {
00576         s->io_method = io_mmap;
00577         res = mmap_init(s1);
00578         if (res == 0) {
00579             res = mmap_start(s1);
00580         }
00581     } else {
00582         s->io_method = io_read;
00583         res = read_init(s1);
00584     }
00585     if (res < 0) {
00586         close(s->fd);
00587 
00588         return AVERROR(EIO);
00589     }
00590     s->top_field_first = first_field(s->fd);
00591 
00592     st->codec->codec_type = CODEC_TYPE_VIDEO;
00593     st->codec->codec_id = CODEC_ID_RAWVIDEO;
00594     st->codec->width = width;
00595     st->codec->height = height;
00596     st->codec->time_base.den = ap->time_base.den;
00597     st->codec->time_base.num = ap->time_base.num;
00598     st->codec->bit_rate = s->frame_size * 1/av_q2d(st->codec->time_base) * 8;
00599 
00600     return 0;
00601 }
00602 
00603 static int v4l2_read_packet(AVFormatContext *s1, AVPacket *pkt)
00604 {
00605     struct video_data *s = s1->priv_data;
00606     int res;
00607 
00608     if (s->io_method == io_mmap) {
00609         av_init_packet(pkt);
00610         res = mmap_read_frame(s1, pkt);
00611     } else if (s->io_method == io_read) {
00612         if (av_new_packet(pkt, s->frame_size) < 0)
00613             return AVERROR(EIO);
00614 
00615         res = read_frame(s1, pkt);
00616     } else {
00617         return AVERROR(EIO);
00618     }
00619     if (res < 0) {
00620         return res;
00621     }
00622 
00623     if (s1->streams[0]->codec->coded_frame) {
00624         s1->streams[0]->codec->coded_frame->interlaced_frame = 1;
00625         s1->streams[0]->codec->coded_frame->top_field_first = s->top_field_first;
00626     }
00627 
00628     return s->frame_size;
00629 }
00630 
00631 static int v4l2_read_close(AVFormatContext *s1)
00632 {
00633     struct video_data *s = s1->priv_data;
00634 
00635     if (s->io_method == io_mmap) {
00636         mmap_close(s);
00637     }
00638 
00639     close(s->fd);
00640     return 0;
00641 }
00642 
00643 AVInputFormat v4l2_demuxer = {
00644     "video4linux2",
00645     NULL_IF_CONFIG_SMALL("Video4Linux2 device grab"),
00646     sizeof(struct video_data),
00647     NULL,
00648     v4l2_read_header,
00649     v4l2_read_packet,
00650     v4l2_read_close,
00651     .flags = AVFMT_NOFILE,
00652 };

Generated on Sat Feb 16 2013 09:23:14 for ffmpeg by  doxygen 1.7.1