| 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 |