blob: d6c3c65da49c7a66261112260f469560072d0bcd
1 | /* |
2 | * Copyright (c) 2013 Stefano Sabatini |
3 | * |
4 | * This file is part of FFmpeg. |
5 | * |
6 | * FFmpeg is free software; you can redistribute it and/or |
7 | * modify it under the terms of the GNU Lesser General Public |
8 | * License as published by the Free Software Foundation; either |
9 | * version 2.1 of the License, or (at your option) any later version. |
10 | * |
11 | * FFmpeg is distributed in the hope that it will be useful, |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
14 | * Lesser General Public License for more details. |
15 | * |
16 | * You should have received a copy of the GNU Lesser General Public |
17 | * License along with FFmpeg; if not, write to the Free Software |
18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
19 | */ |
20 | |
21 | /** |
22 | * @file |
23 | * receive commands through libzeromq and broker them to filters |
24 | */ |
25 | |
26 | #include <zmq.h> |
27 | #include "libavutil/avstring.h" |
28 | #include "libavutil/bprint.h" |
29 | #include "libavutil/opt.h" |
30 | #include "avfilter.h" |
31 | #include "internal.h" |
32 | #include "avfiltergraph.h" |
33 | #include "audio.h" |
34 | #include "video.h" |
35 | |
36 | typedef struct { |
37 | const AVClass *class; |
38 | void *zmq; |
39 | void *responder; |
40 | char *bind_address; |
41 | int command_count; |
42 | } ZMQContext; |
43 | |
44 | #define OFFSET(x) offsetof(ZMQContext, x) |
45 | #define FLAGS AV_OPT_FLAG_FILTERING_PARAM | AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_VIDEO_PARAM |
46 | static const AVOption options[] = { |
47 | { "bind_address", "set bind address", OFFSET(bind_address), AV_OPT_TYPE_STRING, {.str = "tcp://*:5555"}, 0, 0, FLAGS }, |
48 | { "b", "set bind address", OFFSET(bind_address), AV_OPT_TYPE_STRING, {.str = "tcp://*:5555"}, 0, 0, FLAGS }, |
49 | { NULL } |
50 | }; |
51 | |
52 | static av_cold int init(AVFilterContext *ctx) |
53 | { |
54 | ZMQContext *zmq = ctx->priv; |
55 | |
56 | zmq->zmq = zmq_ctx_new(); |
57 | if (!zmq->zmq) { |
58 | av_log(ctx, AV_LOG_ERROR, |
59 | "Could not create ZMQ context: %s\n", zmq_strerror(errno)); |
60 | return AVERROR_EXTERNAL; |
61 | } |
62 | |
63 | zmq->responder = zmq_socket(zmq->zmq, ZMQ_REP); |
64 | if (!zmq->responder) { |
65 | av_log(ctx, AV_LOG_ERROR, |
66 | "Could not create ZMQ socket: %s\n", zmq_strerror(errno)); |
67 | return AVERROR_EXTERNAL; |
68 | } |
69 | |
70 | if (zmq_bind(zmq->responder, zmq->bind_address) == -1) { |
71 | av_log(ctx, AV_LOG_ERROR, |
72 | "Could not bind ZMQ socket to address '%s': %s\n", |
73 | zmq->bind_address, zmq_strerror(errno)); |
74 | return AVERROR_EXTERNAL; |
75 | } |
76 | |
77 | zmq->command_count = -1; |
78 | return 0; |
79 | } |
80 | |
81 | static void av_cold uninit(AVFilterContext *ctx) |
82 | { |
83 | ZMQContext *zmq = ctx->priv; |
84 | |
85 | zmq_close(zmq->responder); |
86 | zmq_ctx_destroy(zmq->zmq); |
87 | } |
88 | |
89 | typedef struct { |
90 | char *target, *command, *arg; |
91 | } Command; |
92 | |
93 | #define SPACES " \f\t\n\r" |
94 | |
95 | static int parse_command(Command *cmd, const char *command_str, void *log_ctx) |
96 | { |
97 | const char **buf = &command_str; |
98 | |
99 | cmd->target = av_get_token(buf, SPACES); |
100 | if (!cmd->target || !cmd->target[0]) { |
101 | av_log(log_ctx, AV_LOG_ERROR, |
102 | "No target specified in command '%s'\n", command_str); |
103 | return AVERROR(EINVAL); |
104 | } |
105 | |
106 | cmd->command = av_get_token(buf, SPACES); |
107 | if (!cmd->command || !cmd->command[0]) { |
108 | av_log(log_ctx, AV_LOG_ERROR, |
109 | "No command specified in command '%s'\n", command_str); |
110 | return AVERROR(EINVAL); |
111 | } |
112 | |
113 | cmd->arg = av_get_token(buf, SPACES); |
114 | return 0; |
115 | } |
116 | |
117 | static int recv_msg(AVFilterContext *ctx, char **buf, int *buf_size) |
118 | { |
119 | ZMQContext *zmq = ctx->priv; |
120 | zmq_msg_t msg; |
121 | int ret = 0; |
122 | |
123 | if (zmq_msg_init(&msg) == -1) { |
124 | av_log(ctx, AV_LOG_WARNING, |
125 | "Could not initialize receive message: %s\n", zmq_strerror(errno)); |
126 | return AVERROR_EXTERNAL; |
127 | } |
128 | |
129 | if (zmq_msg_recv(&msg, zmq->responder, ZMQ_DONTWAIT) == -1) { |
130 | if (errno != EAGAIN) |
131 | av_log(ctx, AV_LOG_WARNING, |
132 | "Could not receive message: %s\n", zmq_strerror(errno)); |
133 | ret = AVERROR_EXTERNAL; |
134 | goto end; |
135 | } |
136 | |
137 | *buf_size = zmq_msg_size(&msg) + 1; |
138 | *buf = av_malloc(*buf_size); |
139 | if (!*buf) { |
140 | ret = AVERROR(ENOMEM); |
141 | goto end; |
142 | } |
143 | memcpy(*buf, zmq_msg_data(&msg), *buf_size); |
144 | (*buf)[*buf_size-1] = 0; |
145 | |
146 | end: |
147 | zmq_msg_close(&msg); |
148 | return ret; |
149 | } |
150 | |
151 | static int filter_frame(AVFilterLink *inlink, AVFrame *ref) |
152 | { |
153 | AVFilterContext *ctx = inlink->dst; |
154 | ZMQContext *zmq = ctx->priv; |
155 | |
156 | while (1) { |
157 | char cmd_buf[1024]; |
158 | char *recv_buf, *send_buf; |
159 | int recv_buf_size; |
160 | Command cmd = {0}; |
161 | int ret; |
162 | |
163 | /* receive command */ |
164 | if (recv_msg(ctx, &recv_buf, &recv_buf_size) < 0) |
165 | break; |
166 | zmq->command_count++; |
167 | |
168 | /* parse command */ |
169 | if (parse_command(&cmd, recv_buf, ctx) < 0) { |
170 | av_log(ctx, AV_LOG_ERROR, "Could not parse command #%d\n", zmq->command_count); |
171 | goto end; |
172 | } |
173 | |
174 | /* process command */ |
175 | av_log(ctx, AV_LOG_VERBOSE, |
176 | "Processing command #%d target:%s command:%s arg:%s\n", |
177 | zmq->command_count, cmd.target, cmd.command, cmd.arg); |
178 | ret = avfilter_graph_send_command(inlink->graph, |
179 | cmd.target, cmd.command, cmd.arg, |
180 | cmd_buf, sizeof(cmd_buf), |
181 | AVFILTER_CMD_FLAG_ONE); |
182 | send_buf = av_asprintf("%d %s%s%s", |
183 | -ret, av_err2str(ret), cmd_buf[0] ? "\n" : "", cmd_buf); |
184 | if (!send_buf) { |
185 | ret = AVERROR(ENOMEM); |
186 | goto end; |
187 | } |
188 | av_log(ctx, AV_LOG_VERBOSE, |
189 | "Sending command reply for command #%d:\n%s\n", |
190 | zmq->command_count, send_buf); |
191 | if (zmq_send(zmq->responder, send_buf, strlen(send_buf), 0) == -1) |
192 | av_log(ctx, AV_LOG_ERROR, "Failed to send reply for command #%d: %s\n", |
193 | zmq->command_count, zmq_strerror(ret)); |
194 | |
195 | end: |
196 | av_freep(&send_buf); |
197 | av_freep(&recv_buf); |
198 | recv_buf_size = 0; |
199 | av_freep(&cmd.target); |
200 | av_freep(&cmd.command); |
201 | av_freep(&cmd.arg); |
202 | } |
203 | |
204 | return ff_filter_frame(ctx->outputs[0], ref); |
205 | } |
206 | |
207 | #if CONFIG_ZMQ_FILTER |
208 | |
209 | #define zmq_options options |
210 | AVFILTER_DEFINE_CLASS(zmq); |
211 | |
212 | static const AVFilterPad zmq_inputs[] = { |
213 | { |
214 | .name = "default", |
215 | .type = AVMEDIA_TYPE_VIDEO, |
216 | .filter_frame = filter_frame, |
217 | }, |
218 | { NULL } |
219 | }; |
220 | |
221 | static const AVFilterPad zmq_outputs[] = { |
222 | { |
223 | .name = "default", |
224 | .type = AVMEDIA_TYPE_VIDEO, |
225 | }, |
226 | { NULL } |
227 | }; |
228 | |
229 | AVFilter ff_vf_zmq = { |
230 | .name = "zmq", |
231 | .description = NULL_IF_CONFIG_SMALL("Receive commands through ZMQ and broker them to filters."), |
232 | .init = init, |
233 | .uninit = uninit, |
234 | .priv_size = sizeof(ZMQContext), |
235 | .inputs = zmq_inputs, |
236 | .outputs = zmq_outputs, |
237 | .priv_class = &zmq_class, |
238 | }; |
239 | |
240 | #endif |
241 | |
242 | #if CONFIG_AZMQ_FILTER |
243 | |
244 | #define azmq_options options |
245 | AVFILTER_DEFINE_CLASS(azmq); |
246 | |
247 | static const AVFilterPad azmq_inputs[] = { |
248 | { |
249 | .name = "default", |
250 | .type = AVMEDIA_TYPE_AUDIO, |
251 | .filter_frame = filter_frame, |
252 | }, |
253 | { NULL } |
254 | }; |
255 | |
256 | static const AVFilterPad azmq_outputs[] = { |
257 | { |
258 | .name = "default", |
259 | .type = AVMEDIA_TYPE_AUDIO, |
260 | }, |
261 | { NULL } |
262 | }; |
263 | |
264 | AVFilter ff_af_azmq = { |
265 | .name = "azmq", |
266 | .description = NULL_IF_CONFIG_SMALL("Receive commands through ZMQ and broker them to filters."), |
267 | .init = init, |
268 | .uninit = uninit, |
269 | .priv_size = sizeof(ZMQContext), |
270 | .inputs = azmq_inputs, |
271 | .outputs = azmq_outputs, |
272 | .priv_class = &azmq_class, |
273 | }; |
274 | |
275 | #endif |
276 |