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Rev | Author | Line No. | Line |
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4349 | Serge | 1 | /* |
2 | * Linux DV1394 interface |
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3 | * Copyright (c) 2003 Max Krasnyansky |
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4 | * |
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5 | * This file is part of FFmpeg. |
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6 | * |
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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 |
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9 | * License as published by the Free Software Foundation; either |
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10 | * version 2.1 of the License, or (at your option) any later version. |
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11 | * |
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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 |
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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15 | * Lesser General Public License for more details. |
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16 | * |
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17 | * You should have received a copy of the GNU Lesser General Public |
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18 | * License along with FFmpeg; if not, write to the Free Software |
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19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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20 | */ |
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21 | |||
22 | #include "config.h" |
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23 | #include |
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24 | #include |
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25 | #include |
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26 | #include |
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27 | #include |
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28 | #include |
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29 | |||
30 | #include "libavutil/internal.h" |
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31 | #include "libavutil/log.h" |
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32 | #include "libavutil/opt.h" |
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33 | #include "avdevice.h" |
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34 | #include "libavformat/dv.h" |
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35 | #include "dv1394.h" |
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36 | |||
37 | struct dv1394_data { |
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38 | AVClass *class; |
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39 | int fd; |
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40 | int channel; |
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41 | int format; |
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42 | |||
43 | uint8_t *ring; /* Ring buffer */ |
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44 | int index; /* Current frame index */ |
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45 | int avail; /* Number of frames available for reading */ |
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46 | int done; /* Number of completed frames */ |
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47 | |||
48 | DVDemuxContext* dv_demux; /* Generic DV muxing/demuxing context */ |
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49 | }; |
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50 | |||
51 | /* |
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52 | * The trick here is to kludge around well known problem with kernel Ooopsing |
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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 |
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55 | * amount of data. |
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56 | */ |
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57 | static int dv1394_reset(struct dv1394_data *dv) |
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58 | { |
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59 | struct dv1394_init init; |
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60 | |||
61 | init.channel = dv->channel; |
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62 | init.api_version = DV1394_API_VERSION; |
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63 | init.n_frames = DV1394_RING_FRAMES; |
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64 | init.format = DV1394_PAL; |
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65 | |||
66 | if (ioctl(dv->fd, DV1394_INIT, &init) < 0) |
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67 | return -1; |
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68 | |||
69 | dv->avail = dv->done = 0; |
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70 | return 0; |
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71 | } |
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72 | |||
73 | static int dv1394_start(struct dv1394_data *dv) |
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74 | { |
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75 | /* Tell DV1394 driver to enable receiver */ |
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76 | if (ioctl(dv->fd, DV1394_START_RECEIVE, 0) < 0) { |
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77 | av_log(NULL, AV_LOG_ERROR, "Failed to start receiver: %s\n", strerror(errno)); |
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78 | return -1; |
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79 | } |
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80 | return 0; |
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81 | } |
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82 | |||
83 | static int dv1394_read_header(AVFormatContext * context) |
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84 | { |
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85 | struct dv1394_data *dv = context->priv_data; |
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86 | |||
87 | dv->dv_demux = avpriv_dv_init_demux(context); |
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88 | if (!dv->dv_demux) |
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89 | goto failed; |
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90 | |||
91 | /* Open and initialize DV1394 device */ |
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92 | dv->fd = avpriv_open(context->filename, O_RDONLY); |
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93 | if (dv->fd < 0) { |
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94 | av_log(context, AV_LOG_ERROR, "Failed to open DV interface: %s\n", strerror(errno)); |
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95 | goto failed; |
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96 | } |
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97 | |||
98 | if (dv1394_reset(dv) < 0) { |
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99 | av_log(context, AV_LOG_ERROR, "Failed to initialize DV interface: %s\n", strerror(errno)); |
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100 | goto failed; |
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101 | } |
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102 | |||
103 | dv->ring = mmap(NULL, DV1394_PAL_FRAME_SIZE * DV1394_RING_FRAMES, |
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104 | PROT_READ, MAP_PRIVATE, dv->fd, 0); |
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105 | if (dv->ring == MAP_FAILED) { |
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106 | av_log(context, AV_LOG_ERROR, "Failed to mmap DV ring buffer: %s\n", strerror(errno)); |
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107 | goto failed; |
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108 | } |
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109 | |||
110 | if (dv1394_start(dv) < 0) |
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111 | goto failed; |
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112 | |||
113 | return 0; |
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114 | |||
115 | failed: |
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116 | close(dv->fd); |
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117 | return AVERROR(EIO); |
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118 | } |
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119 | |||
120 | static int dv1394_read_packet(AVFormatContext *context, AVPacket *pkt) |
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121 | { |
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122 | struct dv1394_data *dv = context->priv_data; |
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123 | int size; |
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124 | |||
125 | size = avpriv_dv_get_packet(dv->dv_demux, pkt); |
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126 | if (size > 0) |
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127 | return size; |
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128 | |||
129 | if (!dv->avail) { |
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130 | struct dv1394_status s; |
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131 | struct pollfd p; |
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132 | |||
133 | if (dv->done) { |
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134 | /* Request more frames */ |
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135 | if (ioctl(dv->fd, DV1394_RECEIVE_FRAMES, dv->done) < 0) { |
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136 | /* This usually means that ring buffer overflowed. |
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137 | * We have to reset :(. |
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138 | */ |
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139 | |||
140 | av_log(context, AV_LOG_ERROR, "DV1394: Ring buffer overflow. Reseting ..\n"); |
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141 | |||
142 | dv1394_reset(dv); |
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143 | dv1394_start(dv); |
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144 | } |
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145 | dv->done = 0; |
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146 | } |
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147 | |||
148 | /* Wait until more frames are available */ |
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149 | restart_poll: |
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150 | p.fd = dv->fd; |
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151 | p.events = POLLIN | POLLERR | POLLHUP; |
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152 | if (poll(&p, 1, -1) < 0) { |
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153 | if (errno == EAGAIN || errno == EINTR) |
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154 | goto restart_poll; |
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155 | av_log(context, AV_LOG_ERROR, "Poll failed: %s\n", strerror(errno)); |
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156 | return AVERROR(EIO); |
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157 | } |
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158 | |||
159 | if (ioctl(dv->fd, DV1394_GET_STATUS, &s) < 0) { |
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160 | av_log(context, AV_LOG_ERROR, "Failed to get status: %s\n", strerror(errno)); |
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161 | return AVERROR(EIO); |
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162 | } |
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163 | av_dlog(context, "DV1394: status\n" |
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164 | "\tactive_frame\t%d\n" |
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165 | "\tfirst_clear_frame\t%d\n" |
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166 | "\tn_clear_frames\t%d\n" |
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167 | "\tdropped_frames\t%d\n", |
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168 | s.active_frame, s.first_clear_frame, |
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169 | s.n_clear_frames, s.dropped_frames); |
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170 | |||
171 | dv->avail = s.n_clear_frames; |
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172 | dv->index = s.first_clear_frame; |
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173 | dv->done = 0; |
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174 | |||
175 | if (s.dropped_frames) { |
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176 | av_log(context, AV_LOG_ERROR, "DV1394: Frame drop detected (%d). Reseting ..\n", |
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177 | s.dropped_frames); |
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178 | |||
179 | dv1394_reset(dv); |
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180 | dv1394_start(dv); |
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181 | } |
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182 | } |
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183 | |||
184 | av_dlog(context, "index %d, avail %d, done %d\n", dv->index, dv->avail, |
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185 | dv->done); |
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186 | |||
187 | size = avpriv_dv_produce_packet(dv->dv_demux, pkt, |
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188 | dv->ring + (dv->index * DV1394_PAL_FRAME_SIZE), |
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189 | DV1394_PAL_FRAME_SIZE, -1); |
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190 | dv->index = (dv->index + 1) % DV1394_RING_FRAMES; |
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191 | dv->done++; dv->avail--; |
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192 | |||
193 | return size; |
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194 | } |
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195 | |||
196 | static int dv1394_close(AVFormatContext * context) |
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197 | { |
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198 | struct dv1394_data *dv = context->priv_data; |
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199 | |||
200 | /* Shutdown DV1394 receiver */ |
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201 | if (ioctl(dv->fd, DV1394_SHUTDOWN, 0) < 0) |
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202 | av_log(context, AV_LOG_ERROR, "Failed to shutdown DV1394: %s\n", strerror(errno)); |
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203 | |||
204 | /* Unmap ring buffer */ |
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205 | if (munmap(dv->ring, DV1394_NTSC_FRAME_SIZE * DV1394_RING_FRAMES) < 0) |
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206 | av_log(context, AV_LOG_ERROR, "Failed to munmap DV1394 ring buffer: %s\n", strerror(errno)); |
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207 | |||
208 | close(dv->fd); |
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209 | av_free(dv->dv_demux); |
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210 | |||
211 | return 0; |
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212 | } |
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213 | |||
214 | static const AVOption options[] = { |
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215 | { "standard", "", offsetof(struct dv1394_data, format), AV_OPT_TYPE_INT, {.i64 = DV1394_NTSC}, DV1394_NTSC, DV1394_PAL, AV_OPT_FLAG_DECODING_PARAM, "standard" }, |
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216 | { "PAL", "", 0, AV_OPT_TYPE_CONST, {.i64 = DV1394_PAL}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" }, |
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217 | { "NTSC", "", 0, AV_OPT_TYPE_CONST, {.i64 = DV1394_NTSC}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" }, |
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218 | { "channel", "", offsetof(struct dv1394_data, channel), AV_OPT_TYPE_INT, {.i64 = DV1394_DEFAULT_CHANNEL}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM }, |
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219 | { NULL }, |
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220 | }; |
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221 | |||
222 | static const AVClass dv1394_class = { |
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223 | .class_name = "DV1394 indev", |
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224 | .item_name = av_default_item_name, |
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225 | .option = options, |
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226 | .version = LIBAVUTIL_VERSION_INT, |
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227 | }; |
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228 | |||
229 | AVInputFormat ff_dv1394_demuxer = { |
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230 | .name = "dv1394", |
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231 | .long_name = NULL_IF_CONFIG_SMALL("DV1394 A/V grab"), |
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232 | .priv_data_size = sizeof(struct dv1394_data), |
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233 | .read_header = dv1394_read_header, |
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234 | .read_packet = dv1394_read_packet, |
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235 | .read_close = dv1394_close, |
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236 | .flags = AVFMT_NOFILE, |
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237 | .priv_class = &dv1394_class, |
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238 | };>>>>>>>>>> |