Make avpicture_fill() directly call av_fill_image_linesizes() and
[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>
29a717ae 26#include <poll.h>
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27#include <sys/ioctl.h>
28#include <sys/mman.h>
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29#include <sys/time.h>
30#include <time.h>
ea452b54 31#include <strings.h>
8aa3ee32 32
245976da 33#include "libavformat/avformat.h"
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34
35#undef DV1394_DEBUG
36
245976da 37#include "libavformat/dv.h"
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38#include "dv1394.h"
39
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40struct dv1394_data {
41 int fd;
42 int channel;
1501987b 43 int format;
8aa3ee32 44
4abc0971 45 uint8_t *ring; /* Ring buffer */
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46 int index; /* Current frame index */
47 int avail; /* Number of frames available for reading */
48 int done; /* Number of completed frames */
1501987b 49
ddaae6a9 50 DVDemuxContext* dv_demux; /* Generic DV muxing/demuxing context */
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51};
52
115329f1 53/*
1fbe1a61 54 * The trick here is to kludge around well known problem with kernel Ooopsing
115329f1 55 * when you try to capture PAL on a device node configure for NTSC. That's
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56 * why we have to configure the device node for PAL, and then read only NTSC
57 * amount of data.
58 */
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59static int dv1394_reset(struct dv1394_data *dv)
60{
61 struct dv1394_init init;
62
1501987b 63 init.channel = dv->channel;
8aa3ee32 64 init.api_version = DV1394_API_VERSION;
1501987b 65 init.n_frames = DV1394_RING_FRAMES;
1fbe1a61 66 init.format = DV1394_PAL;
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67
68 if (ioctl(dv->fd, DV1394_INIT, &init) < 0)
69 return -1;
70
6fa5a56c 71 dv->avail = dv->done = 0;
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72 return 0;
73}
74
75static int dv1394_start(struct dv1394_data *dv)
76{
77 /* Tell DV1394 driver to enable receiver */
78 if (ioctl(dv->fd, DV1394_START_RECEIVE, 0) < 0) {
9f74582c 79 av_log(NULL, AV_LOG_ERROR, "Failed to start receiver: %s\n", strerror(errno));
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80 return -1;
81 }
82 return 0;
83}
84
85static int dv1394_read_header(AVFormatContext * context, AVFormatParameters * ap)
86{
87 struct dv1394_data *dv = context->priv_data;
8aa3ee32 88
ddaae6a9 89 dv->dv_demux = dv_init_demux(context);
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90 if (!dv->dv_demux)
91 goto failed;
8aa3ee32 92
e3ee3283 93 if (ap->standard && !strcasecmp(ap->standard, "pal"))
bb270c08 94 dv->format = DV1394_PAL;
e3ee3283 95 else
bb270c08 96 dv->format = DV1394_NTSC;
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97
98 if (ap->channel)
99 dv->channel = ap->channel;
100 else
101 dv->channel = DV1394_DEFAULT_CHANNEL;
8aa3ee32 102
8aa3ee32 103 /* Open and initialize DV1394 device */
cc58300e 104 dv->fd = open(context->filename, O_RDONLY);
8aa3ee32 105 if (dv->fd < 0) {
9f74582c 106 av_log(context, AV_LOG_ERROR, "Failed to open DV interface: %s\n", strerror(errno));
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107 goto failed;
108 }
109
110 if (dv1394_reset(dv) < 0) {
9f74582c 111 av_log(context, AV_LOG_ERROR, "Failed to initialize DV interface: %s\n", strerror(errno));
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112 goto failed;
113 }
114
1fbe1a61 115 dv->ring = mmap(NULL, DV1394_PAL_FRAME_SIZE * DV1394_RING_FRAMES,
8aa3ee32 116 PROT_READ, MAP_PRIVATE, dv->fd, 0);
1fbe1a61 117 if (dv->ring == MAP_FAILED) {
9f74582c 118 av_log(context, AV_LOG_ERROR, "Failed to mmap DV ring buffer: %s\n", strerror(errno));
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119 goto failed;
120 }
121
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122 if (dv1394_start(dv) < 0)
123 goto failed;
124
125 return 0;
126
127failed:
128 close(dv->fd);
6f3e0b21 129 return AVERROR(EIO);
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130}
131
1501987b 132static int dv1394_read_packet(AVFormatContext *context, AVPacket *pkt)
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133{
134 struct dv1394_data *dv = context->priv_data;
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135 int size;
136
137 size = dv_get_packet(dv->dv_demux, pkt);
138 if (size > 0)
8066e59f 139 return size;
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140
141 if (!dv->avail) {
142 struct dv1394_status s;
143 struct pollfd p;
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144
145 if (dv->done) {
146 /* Request more frames */
147 if (ioctl(dv->fd, DV1394_RECEIVE_FRAMES, dv->done) < 0) {
148 /* This usually means that ring buffer overflowed.
149 * We have to reset :(.
150 */
115329f1 151
bc874dae 152 av_log(context, AV_LOG_ERROR, "DV1394: Ring buffer overflow. Reseting ..\n");
115329f1 153
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154 dv1394_reset(dv);
155 dv1394_start(dv);
156 }
157 dv->done = 0;
158 }
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159
160 /* Wait until more frames are available */
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161restart_poll:
162 p.fd = dv->fd;
163 p.events = POLLIN | POLLERR | POLLHUP;
8aa3ee32 164 if (poll(&p, 1, -1) < 0) {
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165 if (errno == EAGAIN || errno == EINTR)
166 goto restart_poll;
9f74582c 167 av_log(context, AV_LOG_ERROR, "Poll failed: %s\n", strerror(errno));
6f3e0b21 168 return AVERROR(EIO);
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169 }
170
171 if (ioctl(dv->fd, DV1394_GET_STATUS, &s) < 0) {
9f74582c 172 av_log(context, AV_LOG_ERROR, "Failed to get status: %s\n", strerror(errno));
6f3e0b21 173 return AVERROR(EIO);
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174 }
175#ifdef DV1394_DEBUG
6c953a6a 176 av_log(context, AV_LOG_DEBUG, "DV1394: status\n"
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177 "\tactive_frame\t%d\n"
178 "\tfirst_clear_frame\t%d\n"
179 "\tn_clear_frames\t%d\n"
180 "\tdropped_frames\t%d\n",
181 s.active_frame, s.first_clear_frame,
182 s.n_clear_frames, s.dropped_frames);
183#endif
184
185 dv->avail = s.n_clear_frames;
186 dv->index = s.first_clear_frame;
6fa5a56c 187 dv->done = 0;
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188
189 if (s.dropped_frames) {
bc874dae 190 av_log(context, AV_LOG_ERROR, "DV1394: Frame drop detected (%d). Reseting ..\n",
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191 s.dropped_frames);
192
193 dv1394_reset(dv);
194 dv1394_start(dv);
195 }
196 }
197
8aa3ee32 198#ifdef DV1394_DEBUG
6c953a6a 199 av_log(context, AV_LOG_DEBUG, "index %d, avail %d, done %d\n", dv->index, dv->avail,
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200 dv->done);
201#endif
202
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203 size = dv_produce_packet(dv->dv_demux, pkt,
204 dv->ring + (dv->index * DV1394_PAL_FRAME_SIZE),
bb270c08 205 DV1394_PAL_FRAME_SIZE);
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206 dv->index = (dv->index + 1) % DV1394_RING_FRAMES;
207 dv->done++; dv->avail--;
115329f1 208
7458ccbb 209 return size;
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210}
211
212static int dv1394_close(AVFormatContext * context)
213{
214 struct dv1394_data *dv = context->priv_data;
215
216 /* Shutdown DV1394 receiver */
217 if (ioctl(dv->fd, DV1394_SHUTDOWN, 0) < 0)
9f74582c 218 av_log(context, AV_LOG_ERROR, "Failed to shutdown DV1394: %s\n", strerror(errno));
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219
220 /* Unmap ring buffer */
221 if (munmap(dv->ring, DV1394_NTSC_FRAME_SIZE * DV1394_RING_FRAMES) < 0)
9f74582c 222 av_log(context, AV_LOG_ERROR, "Failed to munmap DV1394 ring buffer: %s\n", strerror(errno));
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223
224 close(dv->fd);
7458ccbb 225 av_free(dv->dv_demux);
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226
227 return 0;
228}
229
ff70e601 230AVInputFormat dv1394_demuxer = {
8aa3ee32 231 .name = "dv1394",
bde15e74 232 .long_name = NULL_IF_CONFIG_SMALL("DV1394 A/V grab"),
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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};