| 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 | static 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 | |
| 73 | static 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 | |
| 83 | static 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 | |
| 115 | failed: |
| 116 | close(dv->fd); |
| 117 | return AVERROR(EIO); |
| 118 | } |
| 119 | |
| 120 | static 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 */ |
| 149 | restart_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 | |
| 196 | static 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 | |
| 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 | }; |