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[libav.git] / libavdevice / dv1394.c
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1/*
2 * Linux DV1394 interface
3 * Copyright (c) 2003 Max Krasnyansky <maxk@qualcomm.com>
4 *
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5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
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8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
b78e7197 10 * version 2.1 of the License, or (at your option) any later version.
8aa3ee32 11 *
b78e7197 12 * FFmpeg is distributed in the hope that it will be useful,
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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
b78e7197 18 * License along with FFmpeg; if not, write to the Free Software
5509bffa 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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20 */
21
b0067549 22#include "config.h"
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23#include <unistd.h>
24#include <fcntl.h>
6fa5a56c 25#include <errno.h>
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26#include <sys/ioctl.h>
27#include <sys/mman.h>
28#include <sys/poll.h>
29#include <sys/time.h>
30#include <time.h>
31
245976da 32#include "libavformat/avformat.h"
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33
34#undef DV1394_DEBUG
35
245976da 36#include "libavformat/dv.h"
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37#include "dv1394.h"
38
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39struct dv1394_data {
40 int fd;
41 int channel;
1501987b 42 int format;
8aa3ee32 43
4abc0971 44 uint8_t *ring; /* Ring buffer */
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45 int index; /* Current frame index */
46 int avail; /* Number of frames available for reading */
47 int done; /* Number of completed frames */
1501987b 48
ddaae6a9 49 DVDemuxContext* dv_demux; /* Generic DV muxing/demuxing context */
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50};
51
115329f1 52/*
1fbe1a61 53 * The trick here is to kludge around well known problem with kernel Ooopsing
115329f1 54 * when you try to capture PAL on a device node configure for NTSC. That's
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55 * why we have to configure the device node for PAL, and then read only NTSC
56 * amount of data.
57 */
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58static int dv1394_reset(struct dv1394_data *dv)
59{
60 struct dv1394_init init;
61
1501987b 62 init.channel = dv->channel;
8aa3ee32 63 init.api_version = DV1394_API_VERSION;
1501987b 64 init.n_frames = DV1394_RING_FRAMES;
1fbe1a61 65 init.format = DV1394_PAL;
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66
67 if (ioctl(dv->fd, DV1394_INIT, &init) < 0)
68 return -1;
69
6fa5a56c 70 dv->avail = dv->done = 0;
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71 return 0;
72}
73
74static int dv1394_start(struct dv1394_data *dv)
75{
76 /* Tell DV1394 driver to enable receiver */
77 if (ioctl(dv->fd, DV1394_START_RECEIVE, 0) < 0) {
9f74582c 78 av_log(NULL, AV_LOG_ERROR, "Failed to start receiver: %s\n", strerror(errno));
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79 return -1;
80 }
81 return 0;
82}
83
84static int dv1394_read_header(AVFormatContext * context, AVFormatParameters * ap)
85{
86 struct dv1394_data *dv = context->priv_data;
8aa3ee32 87
ddaae6a9 88 dv->dv_demux = dv_init_demux(context);
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89 if (!dv->dv_demux)
90 goto failed;
8aa3ee32 91
e3ee3283 92 if (ap->standard && !strcasecmp(ap->standard, "pal"))
bb270c08 93 dv->format = DV1394_PAL;
e3ee3283 94 else
bb270c08 95 dv->format = DV1394_NTSC;
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96
97 if (ap->channel)
98 dv->channel = ap->channel;
99 else
100 dv->channel = DV1394_DEFAULT_CHANNEL;
8aa3ee32 101
8aa3ee32 102 /* Open and initialize DV1394 device */
cc58300e 103 dv->fd = open(context->filename, O_RDONLY);
8aa3ee32 104 if (dv->fd < 0) {
9f74582c 105 av_log(context, AV_LOG_ERROR, "Failed to open DV interface: %s\n", strerror(errno));
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106 goto failed;
107 }
108
109 if (dv1394_reset(dv) < 0) {
9f74582c 110 av_log(context, AV_LOG_ERROR, "Failed to initialize DV interface: %s\n", strerror(errno));
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111 goto failed;
112 }
113
1fbe1a61 114 dv->ring = mmap(NULL, DV1394_PAL_FRAME_SIZE * DV1394_RING_FRAMES,
8aa3ee32 115 PROT_READ, MAP_PRIVATE, dv->fd, 0);
1fbe1a61 116 if (dv->ring == MAP_FAILED) {
9f74582c 117 av_log(context, AV_LOG_ERROR, "Failed to mmap DV ring buffer: %s\n", strerror(errno));
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118 goto failed;
119 }
120
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121 if (dv1394_start(dv) < 0)
122 goto failed;
123
124 return 0;
125
126failed:
127 close(dv->fd);
6f3e0b21 128 return AVERROR(EIO);
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129}
130
1501987b 131static int dv1394_read_packet(AVFormatContext *context, AVPacket *pkt)
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132{
133 struct dv1394_data *dv = context->priv_data;
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134 int size;
135
136 size = dv_get_packet(dv->dv_demux, pkt);
137 if (size > 0)
8066e59f 138 return size;
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139
140 if (!dv->avail) {
141 struct dv1394_status s;
142 struct pollfd p;
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143
144 if (dv->done) {
145 /* Request more frames */
146 if (ioctl(dv->fd, DV1394_RECEIVE_FRAMES, dv->done) < 0) {
147 /* This usually means that ring buffer overflowed.
148 * We have to reset :(.
149 */
115329f1 150
bc874dae 151 av_log(context, AV_LOG_ERROR, "DV1394: Ring buffer overflow. Reseting ..\n");
115329f1 152
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153 dv1394_reset(dv);
154 dv1394_start(dv);
155 }
156 dv->done = 0;
157 }
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158
159 /* Wait until more frames are available */
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160restart_poll:
161 p.fd = dv->fd;
162 p.events = POLLIN | POLLERR | POLLHUP;
8aa3ee32 163 if (poll(&p, 1, -1) < 0) {
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164 if (errno == EAGAIN || errno == EINTR)
165 goto restart_poll;
9f74582c 166 av_log(context, AV_LOG_ERROR, "Poll failed: %s\n", strerror(errno));
6f3e0b21 167 return AVERROR(EIO);
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168 }
169
170 if (ioctl(dv->fd, DV1394_GET_STATUS, &s) < 0) {
9f74582c 171 av_log(context, AV_LOG_ERROR, "Failed to get status: %s\n", strerror(errno));
6f3e0b21 172 return AVERROR(EIO);
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173 }
174#ifdef DV1394_DEBUG
6c953a6a 175 av_log(context, AV_LOG_DEBUG, "DV1394: status\n"
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176 "\tactive_frame\t%d\n"
177 "\tfirst_clear_frame\t%d\n"
178 "\tn_clear_frames\t%d\n"
179 "\tdropped_frames\t%d\n",
180 s.active_frame, s.first_clear_frame,
181 s.n_clear_frames, s.dropped_frames);
182#endif
183
184 dv->avail = s.n_clear_frames;
185 dv->index = s.first_clear_frame;
6fa5a56c 186 dv->done = 0;
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187
188 if (s.dropped_frames) {
bc874dae 189 av_log(context, AV_LOG_ERROR, "DV1394: Frame drop detected (%d). Reseting ..\n",
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190 s.dropped_frames);
191
192 dv1394_reset(dv);
193 dv1394_start(dv);
194 }
195 }
196
8aa3ee32 197#ifdef DV1394_DEBUG
6c953a6a 198 av_log(context, AV_LOG_DEBUG, "index %d, avail %d, done %d\n", dv->index, dv->avail,
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199 dv->done);
200#endif
201
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202 size = dv_produce_packet(dv->dv_demux, pkt,
203 dv->ring + (dv->index * DV1394_PAL_FRAME_SIZE),
bb270c08 204 DV1394_PAL_FRAME_SIZE);
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205 dv->index = (dv->index + 1) % DV1394_RING_FRAMES;
206 dv->done++; dv->avail--;
115329f1 207
7458ccbb 208 return size;
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209}
210
211static int dv1394_close(AVFormatContext * context)
212{
213 struct dv1394_data *dv = context->priv_data;
214
215 /* Shutdown DV1394 receiver */
216 if (ioctl(dv->fd, DV1394_SHUTDOWN, 0) < 0)
9f74582c 217 av_log(context, AV_LOG_ERROR, "Failed to shutdown DV1394: %s\n", strerror(errno));
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218
219 /* Unmap ring buffer */
220 if (munmap(dv->ring, DV1394_NTSC_FRAME_SIZE * DV1394_RING_FRAMES) < 0)
9f74582c 221 av_log(context, AV_LOG_ERROR, "Failed to munmap DV1394 ring buffer: %s\n", strerror(errno));
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222
223 close(dv->fd);
7458ccbb 224 av_free(dv->dv_demux);
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225
226 return 0;
227}
228
ff70e601 229AVInputFormat dv1394_demuxer = {
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230 .name = "dv1394",
231 .long_name = "dv1394 A/V grab",
232 .priv_data_size = sizeof(struct dv1394_data),
233 .read_header = dv1394_read_header,
234 .read_packet = dv1394_read_packet,
235 .read_close = dv1394_close,
236 .flags = AVFMT_NOFILE
237};