blob: c3483010fa0dcbf57c8de2d278829ce48e6f72d4
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. Resetting ..\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_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 | 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). Resetting ..\n", |
177 | s.dropped_frames); |
178 | |
179 | dv1394_reset(dv); |
180 | dv1394_start(dv); |
181 | } |
182 | } |
183 | |
184 | av_log(context, AV_LOG_TRACE, "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_freep(&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 | }; |
240 |