Add log_level_offset to AVCodecContext.
[libav.git] / 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 #include <sys/time.h>
30 #include <time.h>
31 #include <strings.h>
32
33 #include "libavformat/avformat.h"
34
35 #undef DV1394_DEBUG
36
37 #include "libavformat/dv.h"
38 #include "dv1394.h"
39
40 struct dv1394_data {
41 int fd;
42 int channel;
43 int format;
44
45 uint8_t *ring; /* Ring buffer */
46 int index; /* Current frame index */
47 int avail; /* Number of frames available for reading */
48 int done; /* Number of completed frames */
49
50 DVDemuxContext* dv_demux; /* Generic DV muxing/demuxing context */
51 };
52
53 /*
54 * The trick here is to kludge around well known problem with kernel Ooopsing
55 * when you try to capture PAL on a device node configure for NTSC. That's
56 * why we have to configure the device node for PAL, and then read only NTSC
57 * amount of data.
58 */
59 static int dv1394_reset(struct dv1394_data *dv)
60 {
61 struct dv1394_init init;
62
63 init.channel = dv->channel;
64 init.api_version = DV1394_API_VERSION;
65 init.n_frames = DV1394_RING_FRAMES;
66 init.format = DV1394_PAL;
67
68 if (ioctl(dv->fd, DV1394_INIT, &init) < 0)
69 return -1;
70
71 dv->avail = dv->done = 0;
72 return 0;
73 }
74
75 static 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) {
79 av_log(NULL, AV_LOG_ERROR, "Failed to start receiver: %s\n", strerror(errno));
80 return -1;
81 }
82 return 0;
83 }
84
85 static int dv1394_read_header(AVFormatContext * context, AVFormatParameters * ap)
86 {
87 struct dv1394_data *dv = context->priv_data;
88
89 dv->dv_demux = dv_init_demux(context);
90 if (!dv->dv_demux)
91 goto failed;
92
93 if (ap->standard && !strcasecmp(ap->standard, "pal"))
94 dv->format = DV1394_PAL;
95 else
96 dv->format = DV1394_NTSC;
97
98 if (ap->channel)
99 dv->channel = ap->channel;
100 else
101 dv->channel = DV1394_DEFAULT_CHANNEL;
102
103 /* Open and initialize DV1394 device */
104 dv->fd = open(context->filename, O_RDONLY);
105 if (dv->fd < 0) {
106 av_log(context, AV_LOG_ERROR, "Failed to open DV interface: %s\n", strerror(errno));
107 goto failed;
108 }
109
110 if (dv1394_reset(dv) < 0) {
111 av_log(context, AV_LOG_ERROR, "Failed to initialize DV interface: %s\n", strerror(errno));
112 goto failed;
113 }
114
115 dv->ring = mmap(NULL, DV1394_PAL_FRAME_SIZE * DV1394_RING_FRAMES,
116 PROT_READ, MAP_PRIVATE, dv->fd, 0);
117 if (dv->ring == MAP_FAILED) {
118 av_log(context, AV_LOG_ERROR, "Failed to mmap DV ring buffer: %s\n", strerror(errno));
119 goto failed;
120 }
121
122 if (dv1394_start(dv) < 0)
123 goto failed;
124
125 return 0;
126
127 failed:
128 close(dv->fd);
129 return AVERROR(EIO);
130 }
131
132 static int dv1394_read_packet(AVFormatContext *context, AVPacket *pkt)
133 {
134 struct dv1394_data *dv = context->priv_data;
135 int size;
136
137 size = dv_get_packet(dv->dv_demux, pkt);
138 if (size > 0)
139 return size;
140
141 if (!dv->avail) {
142 struct dv1394_status s;
143 struct pollfd p;
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 */
151
152 av_log(context, AV_LOG_ERROR, "DV1394: Ring buffer overflow. Reseting ..\n");
153
154 dv1394_reset(dv);
155 dv1394_start(dv);
156 }
157 dv->done = 0;
158 }
159
160 /* Wait until more frames are available */
161 restart_poll:
162 p.fd = dv->fd;
163 p.events = POLLIN | POLLERR | POLLHUP;
164 if (poll(&p, 1, -1) < 0) {
165 if (errno == EAGAIN || errno == EINTR)
166 goto restart_poll;
167 av_log(context, AV_LOG_ERROR, "Poll failed: %s\n", strerror(errno));
168 return AVERROR(EIO);
169 }
170
171 if (ioctl(dv->fd, DV1394_GET_STATUS, &s) < 0) {
172 av_log(context, AV_LOG_ERROR, "Failed to get status: %s\n", strerror(errno));
173 return AVERROR(EIO);
174 }
175 #ifdef DV1394_DEBUG
176 av_log(context, AV_LOG_DEBUG, "DV1394: status\n"
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;
187 dv->done = 0;
188
189 if (s.dropped_frames) {
190 av_log(context, AV_LOG_ERROR, "DV1394: Frame drop detected (%d). Reseting ..\n",
191 s.dropped_frames);
192
193 dv1394_reset(dv);
194 dv1394_start(dv);
195 }
196 }
197
198 #ifdef DV1394_DEBUG
199 av_log(context, AV_LOG_DEBUG, "index %d, avail %d, done %d\n", dv->index, dv->avail,
200 dv->done);
201 #endif
202
203 size = dv_produce_packet(dv->dv_demux, pkt,
204 dv->ring + (dv->index * DV1394_PAL_FRAME_SIZE),
205 DV1394_PAL_FRAME_SIZE);
206 dv->index = (dv->index + 1) % DV1394_RING_FRAMES;
207 dv->done++; dv->avail--;
208
209 return size;
210 }
211
212 static 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)
218 av_log(context, AV_LOG_ERROR, "Failed to shutdown DV1394: %s\n", strerror(errno));
219
220 /* Unmap ring buffer */
221 if (munmap(dv->ring, DV1394_NTSC_FRAME_SIZE * DV1394_RING_FRAMES) < 0)
222 av_log(context, AV_LOG_ERROR, "Failed to munmap DV1394 ring buffer: %s\n", strerror(errno));
223
224 close(dv->fd);
225 av_free(dv->dv_demux);
226
227 return 0;
228 }
229
230 AVInputFormat 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 };