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 37struct 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 */ 57static int dv1394_reset(struct dv1394_data *dv) 58{ 59 struct dv1394_init init; 60 61 init.channel = dv->channel; 62 init.api_version = DV1394_API_VERSION; 63 init.n_frames = DV1394_RING_FRAMES; 64 init.format = DV1394_PAL; 65 66 if (ioctl(dv->fd, DV1394_INIT, &init) < 0) 67 return -1; 68 69 dv->avail = dv->done = 0; 70 return 0; 71} 72 73static int dv1394_start(struct dv1394_data *dv) 74{ 75 /* Tell DV1394 driver to enable receiver */ 76 if (ioctl(dv->fd, DV1394_START_RECEIVE, 0) < 0) { 77 av_log(NULL, AV_LOG_ERROR, "Failed to start receiver: %s\n", strerror(errno)); 78 return -1; 79 } 80 return 0; 81} 82 83static int dv1394_read_header(AVFormatContext * context) 84{ 85 struct dv1394_data *dv = context->priv_data; 86 87 dv->dv_demux = avpriv_dv_init_demux(context); 88 if (!dv->dv_demux) 89 goto failed; 90 91 /* Open and initialize DV1394 device */ 92 dv->fd = avpriv_open(context->filename, O_RDONLY); 93 if (dv->fd < 0) { 94 av_log(context, AV_LOG_ERROR, "Failed to open DV interface: %s\n", strerror(errno)); 95 goto failed; 96 } 97 98 if (dv1394_reset(dv) < 0) { 99 av_log(context, AV_LOG_ERROR, "Failed to initialize DV interface: %s\n", strerror(errno)); 100 goto failed; 101 } 102 103 dv->ring = mmap(NULL, DV1394_PAL_FRAME_SIZE * DV1394_RING_FRAMES, 104 PROT_READ, MAP_PRIVATE, dv->fd, 0); 105 if (dv->ring == MAP_FAILED) { 106 av_log(context, AV_LOG_ERROR, "Failed to mmap DV ring buffer: %s\n", strerror(errno)); 107 goto failed; 108 } 109 110 if (dv1394_start(dv) < 0) 111 goto failed; 112 113 return 0; 114 115failed: 116 close(dv->fd); 117 return AVERROR(EIO); 118} 119 120static int dv1394_read_packet(AVFormatContext *context, AVPacket *pkt) 121{ 122 struct dv1394_data *dv = context->priv_data; 123 int size; 124 125 size = avpriv_dv_get_packet(dv->dv_demux, pkt); 126 if (size > 0) 127 return size; 128 129 if (!dv->avail) { 130 struct dv1394_status s; 131 struct pollfd p; 132 133 if (dv->done) { 134 /* Request more frames */ 135 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 av_log(context, AV_LOG_ERROR, "DV1394: Ring buffer overflow. Reseting ..\n"); 141 142 dv1394_reset(dv); 143 dv1394_start(dv); 144 } 145 dv->done = 0; 146 } 147 148 /* Wait until more frames are available */ 149restart_poll: 150 p.fd = dv->fd; 151 p.events = POLLIN | POLLERR | POLLHUP; 152 if (poll(&p, 1, -1) < 0) { 153 if (errno == EAGAIN || errno == EINTR) 154 goto restart_poll; 155 av_log(context, AV_LOG_ERROR, "Poll failed: %s\n", strerror(errno)); 156 return AVERROR(EIO); 157 } 158 159 if (ioctl(dv->fd, DV1394_GET_STATUS, &s) < 0) { 160 av_log(context, AV_LOG_ERROR, "Failed to get status: %s\n", strerror(errno)); 161 return AVERROR(EIO); 162 } 163 av_dlog(context, "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 dv->avail = s.n_clear_frames; 172 dv->index = s.first_clear_frame; 173 dv->done = 0; 174 175 if (s.dropped_frames) { 176 av_log(context, AV_LOG_ERROR, "DV1394: Frame drop detected (%d). Reseting ..\n", 177 s.dropped_frames); 178 179 dv1394_reset(dv); 180 dv1394_start(dv); 181 } 182 } 183 184 av_dlog(context, "index %d, avail %d, done %d\n", dv->index, dv->avail, 185 dv->done); 186 187 size = avpriv_dv_produce_packet(dv->dv_demux, pkt, 188 dv->ring + (dv->index * DV1394_PAL_FRAME_SIZE), 189 DV1394_PAL_FRAME_SIZE, -1); 190 dv->index = (dv->index + 1) % DV1394_RING_FRAMES; 191 dv->done++; dv->avail--; 192 193 return size; 194} 195 196static int dv1394_close(AVFormatContext * context) 197{ 198 struct dv1394_data *dv = context->priv_data; 199 200 /* Shutdown DV1394 receiver */ 201 if (ioctl(dv->fd, DV1394_SHUTDOWN, 0) < 0) 202 av_log(context, AV_LOG_ERROR, "Failed to shutdown DV1394: %s\n", strerror(errno)); 203 204 /* Unmap ring buffer */ 205 if (munmap(dv->ring, DV1394_NTSC_FRAME_SIZE * DV1394_RING_FRAMES) < 0) 206 av_log(context, AV_LOG_ERROR, "Failed to munmap DV1394 ring buffer: %s\n", strerror(errno)); 207 208 close(dv->fd); 209 av_free(dv->dv_demux); 210 211 return 0; 212} 213 214static 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 222static 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 230AVInputFormat 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}; 240