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