Imported Debian version 2.5.2~trusty
[deb_ffmpeg.git] / ffmpeg / libavdevice / dv1394.c
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 };