LCOV - code coverage report
Current view: top level - src/libavdevice - dv1394.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 0 79 0.0 %
Date: 2017-01-19 23:52:33 Functions: 0 5 0.0 %

          Line data    Source code
       1             : /*
       2             :  * Linux DV1394 interface
       3             :  * Copyright (c) 2003 Max Krasnyansky <maxk@qualcomm.com>
       4             :  *
       5             :  * This file is part of FFmpeg.
       6             :  *
       7             :  * FFmpeg is free software; you can redistribute it and/or
       8             :  * modify it under the terms of the GNU Lesser General Public
       9             :  * License as published by the Free Software Foundation; either
      10             :  * version 2.1 of the License, or (at your option) any later version.
      11             :  *
      12             :  * FFmpeg is distributed in the hope that it will be useful,
      13             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      14             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      15             :  * Lesser General Public License for more details.
      16             :  *
      17             :  * You should have received a copy of the GNU Lesser General Public
      18             :  * License along with FFmpeg; if not, write to the Free Software
      19             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      20             :  */
      21             : 
      22             : #include "config.h"
      23             : #include <unistd.h>
      24             : #include <fcntl.h>
      25             : #include <errno.h>
      26             : #include <poll.h>
      27             : #include <sys/ioctl.h>
      28             : #include <sys/mman.h>
      29             : 
      30             : #include "libavutil/internal.h"
      31             : #include "libavutil/log.h"
      32             : #include "libavutil/opt.h"
      33             : #include "avdevice.h"
      34             : #include "libavformat/dv.h"
      35             : #include "dv1394.h"
      36             : 
      37             : struct dv1394_data {
      38             :     AVClass *class;
      39             :     int fd;
      40             :     int channel;
      41             :     int format;
      42             : 
      43             :     uint8_t *ring; /* Ring buffer */
      44             :     int index;  /* Current frame index */
      45             :     int avail;  /* Number of frames available for reading */
      46             :     int done;   /* Number of completed frames */
      47             : 
      48             :     DVDemuxContext* dv_demux; /* Generic DV muxing/demuxing context */
      49             : };
      50             : 
      51             : /*
      52             :  * The trick here is to kludge around well known problem with kernel Ooopsing
      53             :  * when you try to capture PAL on a device node configure for NTSC. That's
      54             :  * why we have to configure the device node for PAL, and then read only NTSC
      55             :  * amount of data.
      56             :  */
      57           0 : static int dv1394_reset(struct dv1394_data *dv)
      58             : {
      59             :     struct dv1394_init init;
      60             : 
      61           0 :     init.channel     = dv->channel;
      62           0 :     init.api_version = DV1394_API_VERSION;
      63           0 :     init.n_frames    = DV1394_RING_FRAMES;
      64           0 :     init.format      = DV1394_PAL;
      65             : 
      66           0 :     if (ioctl(dv->fd, DV1394_INIT, &init) < 0)
      67           0 :         return -1;
      68             : 
      69           0 :     dv->avail  = dv->done = 0;
      70           0 :     return 0;
      71             : }
      72             : 
      73           0 : static int dv1394_start(struct dv1394_data *dv)
      74             : {
      75             :     /* Tell DV1394 driver to enable receiver */
      76           0 :     if (ioctl(dv->fd, DV1394_START_RECEIVE, 0) < 0) {
      77           0 :         av_log(NULL, AV_LOG_ERROR, "Failed to start receiver: %s\n", strerror(errno));
      78           0 :         return -1;
      79             :     }
      80           0 :     return 0;
      81             : }
      82             : 
      83           0 : static int dv1394_read_header(AVFormatContext * context)
      84             : {
      85           0 :     struct dv1394_data *dv = context->priv_data;
      86             : 
      87           0 :     dv->dv_demux = avpriv_dv_init_demux(context);
      88           0 :     if (!dv->dv_demux)
      89           0 :         goto failed;
      90             : 
      91             :     /* Open and initialize DV1394 device */
      92           0 :     dv->fd = avpriv_open(context->filename, O_RDONLY);
      93           0 :     if (dv->fd < 0) {
      94           0 :         av_log(context, AV_LOG_ERROR, "Failed to open DV interface: %s\n", strerror(errno));
      95           0 :         goto failed;
      96             :     }
      97             : 
      98           0 :     if (dv1394_reset(dv) < 0) {
      99           0 :         av_log(context, AV_LOG_ERROR, "Failed to initialize DV interface: %s\n", strerror(errno));
     100           0 :         goto failed;
     101             :     }
     102             : 
     103           0 :     dv->ring = mmap(NULL, DV1394_PAL_FRAME_SIZE * DV1394_RING_FRAMES,
     104             :                     PROT_READ, MAP_PRIVATE, dv->fd, 0);
     105           0 :     if (dv->ring == MAP_FAILED) {
     106           0 :         av_log(context, AV_LOG_ERROR, "Failed to mmap DV ring buffer: %s\n", strerror(errno));
     107           0 :         goto failed;
     108             :     }
     109             : 
     110           0 :     if (dv1394_start(dv) < 0)
     111           0 :         goto failed;
     112             : 
     113           0 :     return 0;
     114             : 
     115             : failed:
     116           0 :     close(dv->fd);
     117           0 :     return AVERROR(EIO);
     118             : }
     119             : 
     120           0 : static int dv1394_read_packet(AVFormatContext *context, AVPacket *pkt)
     121             : {
     122           0 :     struct dv1394_data *dv = context->priv_data;
     123             :     int size;
     124             : 
     125           0 :     size = avpriv_dv_get_packet(dv->dv_demux, pkt);
     126           0 :     if (size > 0)
     127           0 :         return size;
     128             : 
     129           0 :     if (!dv->avail) {
     130             :         struct dv1394_status s;
     131             :         struct pollfd p;
     132             : 
     133           0 :         if (dv->done) {
     134             :             /* Request more frames */
     135           0 :             if (ioctl(dv->fd, DV1394_RECEIVE_FRAMES, dv->done) < 0) {
     136             :                 /* This usually means that ring buffer overflowed.
     137             :                  * We have to reset :(.
     138             :                  */
     139             : 
     140           0 :                 av_log(context, AV_LOG_ERROR, "DV1394: Ring buffer overflow. Resetting ..\n");
     141             : 
     142           0 :                 dv1394_reset(dv);
     143           0 :                 dv1394_start(dv);
     144             :             }
     145           0 :             dv->done = 0;
     146             :         }
     147             : 
     148             :         /* Wait until more frames are available */
     149             : restart_poll:
     150           0 :         p.fd = dv->fd;
     151           0 :         p.events = POLLIN | POLLERR | POLLHUP;
     152           0 :         if (poll(&p, 1, -1) < 0) {
     153           0 :             if (errno == EAGAIN || errno == EINTR)
     154             :                 goto restart_poll;
     155           0 :             av_log(context, AV_LOG_ERROR, "Poll failed: %s\n", strerror(errno));
     156           0 :             return AVERROR(EIO);
     157             :         }
     158             : 
     159           0 :         if (ioctl(dv->fd, DV1394_GET_STATUS, &s) < 0) {
     160           0 :             av_log(context, AV_LOG_ERROR, "Failed to get status: %s\n", strerror(errno));
     161           0 :             return AVERROR(EIO);
     162             :         }
     163           0 :         av_log(context, AV_LOG_TRACE, "DV1394: status\n"
     164             :                 "\tactive_frame\t%d\n"
     165             :                 "\tfirst_clear_frame\t%d\n"
     166             :                 "\tn_clear_frames\t%d\n"
     167             :                 "\tdropped_frames\t%d\n",
     168             :                 s.active_frame, s.first_clear_frame,
     169             :                 s.n_clear_frames, s.dropped_frames);
     170             : 
     171           0 :         dv->avail = s.n_clear_frames;
     172           0 :         dv->index = s.first_clear_frame;
     173           0 :         dv->done  = 0;
     174             : 
     175           0 :         if (s.dropped_frames) {
     176           0 :             av_log(context, AV_LOG_ERROR, "DV1394: Frame drop detected (%d). Resetting ..\n",
     177             :                     s.dropped_frames);
     178             : 
     179           0 :             dv1394_reset(dv);
     180           0 :             dv1394_start(dv);
     181             :         }
     182             :     }
     183             : 
     184           0 :     av_log(context, AV_LOG_TRACE, "index %d, avail %d, done %d\n", dv->index, dv->avail,
     185             :             dv->done);
     186             : 
     187           0 :     size = avpriv_dv_produce_packet(dv->dv_demux, pkt,
     188           0 :                              dv->ring + (dv->index * DV1394_PAL_FRAME_SIZE),
     189             :                              DV1394_PAL_FRAME_SIZE, -1);
     190           0 :     dv->index = (dv->index + 1) % DV1394_RING_FRAMES;
     191           0 :     dv->done++; dv->avail--;
     192             : 
     193           0 :     return size;
     194             : }
     195             : 
     196           0 : static int dv1394_close(AVFormatContext * context)
     197             : {
     198           0 :     struct dv1394_data *dv = context->priv_data;
     199             : 
     200             :     /* Shutdown DV1394 receiver */
     201           0 :     if (ioctl(dv->fd, DV1394_SHUTDOWN, 0) < 0)
     202           0 :         av_log(context, AV_LOG_ERROR, "Failed to shutdown DV1394: %s\n", strerror(errno));
     203             : 
     204             :     /* Unmap ring buffer */
     205           0 :     if (munmap(dv->ring, DV1394_NTSC_FRAME_SIZE * DV1394_RING_FRAMES) < 0)
     206           0 :         av_log(context, AV_LOG_ERROR, "Failed to munmap DV1394 ring buffer: %s\n", strerror(errno));
     207             : 
     208           0 :     close(dv->fd);
     209           0 :     av_freep(&dv->dv_demux);
     210             : 
     211           0 :     return 0;
     212             : }
     213             : 
     214             : static const AVOption options[] = {
     215             :     { "standard", "", offsetof(struct dv1394_data, format), AV_OPT_TYPE_INT, {.i64 = DV1394_NTSC}, DV1394_NTSC, DV1394_PAL, AV_OPT_FLAG_DECODING_PARAM, "standard" },
     216             :     { "PAL",      "", 0, AV_OPT_TYPE_CONST, {.i64 = DV1394_PAL},   0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
     217             :     { "NTSC",     "", 0, AV_OPT_TYPE_CONST, {.i64 = DV1394_NTSC},  0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
     218             :     { "channel",  "", offsetof(struct dv1394_data, channel), AV_OPT_TYPE_INT, {.i64 = DV1394_DEFAULT_CHANNEL}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
     219             :     { NULL },
     220             : };
     221             : 
     222             : static const AVClass dv1394_class = {
     223             :     .class_name = "DV1394 indev",
     224             :     .item_name  = av_default_item_name,
     225             :     .option     = options,
     226             :     .version    = LIBAVUTIL_VERSION_INT,
     227             :     .category   = AV_CLASS_CATEGORY_DEVICE_VIDEO_INPUT,
     228             : };
     229             : 
     230             : AVInputFormat ff_dv1394_demuxer = {
     231             :     .name           = "dv1394",
     232             :     .long_name      = NULL_IF_CONFIG_SMALL("DV1394 A/V grab"),
     233             :     .priv_data_size = sizeof(struct dv1394_data),
     234             :     .read_header    = dv1394_read_header,
     235             :     .read_packet    = dv1394_read_packet,
     236             :     .read_close     = dv1394_close,
     237             :     .flags          = AVFMT_NOFILE,
     238             :     .priv_class     = &dv1394_class,
     239             : };

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