lavfi: add zmq filters

1 files changed, 276 insertions, 0 deletions

diff --git a/libavfilter/f_zmq.c b/libavfilter/f_zmq.c
new file mode 100644
index 0000000000..547e1a3798
--- /dev/null
+++ b/libavfilter/f_zmq.c
@@ -0,0 +1,276 @@
+/*
+ * Copyright (c) 2013 Stefano Sabatini
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * receive commands through libzeromq and broker them to filters
+ */
+
+#include <zmq.h>
+#include "libavutil/avstring.h"
+#include "libavutil/bprint.h"
+#include "libavutil/opt.h"
+#include "avfilter.h"
+#include "internal.h"
+#include "avfiltergraph.h"
+#include "audio.h"
+#include "video.h"
+
+typedef struct {
+    const AVClass *class;
+    void *zmq;
+    void *responder;
+    char *bind_address;
+    int command_count;
+} ZMQContext;
+
+#define OFFSET(x) offsetof(ZMQContext, x)
+#define FLAGS AV_OPT_FLAG_FILTERING_PARAM | AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_VIDEO_PARAM
+static const AVOption options[] = {
+    { "bind_address", "set bind address", OFFSET(bind_address), AV_OPT_TYPE_STRING, {.str = "tcp://*:5555"}, 0, 0, FLAGS },
+    { "b",            "set bind address", OFFSET(bind_address), AV_OPT_TYPE_STRING, {.str = "tcp://*:5555"}, 0, 0, FLAGS },
+    { NULL }
+};
+
+static av_cold int init(AVFilterContext *ctx)
+{
+    ZMQContext *zmq = ctx->priv;
+
+    zmq->zmq = zmq_ctx_new();
+    if (!zmq->zmq) {
+        av_log(ctx, AV_LOG_ERROR,
+               "Could not create ZMQ context: %s\n", zmq_strerror(errno));
+        return AVERROR_EXTERNAL;
+    }
+
+    zmq->responder = zmq_socket(zmq->zmq, ZMQ_REP);
+    if (!zmq->responder) {
+        av_log(ctx, AV_LOG_ERROR,
+               "Could not create ZMQ socket: %s\n", zmq_strerror(errno));
+        return AVERROR_EXTERNAL;
+    }
+
+    if (zmq_bind(zmq->responder, zmq->bind_address) == -1) {
+        av_log(ctx, AV_LOG_ERROR,
+               "Could not bind ZMQ socket to address '%s': %s\n",
+               zmq->bind_address, zmq_strerror(errno));
+        return AVERROR_EXTERNAL;
+    }
+
+    zmq->command_count = -1;
+    return 0;
+}
+
+static void av_cold uninit(AVFilterContext *ctx)
+{
+    ZMQContext *zmq = ctx->priv;
+
+    zmq_close(zmq->responder);
+    zmq_ctx_destroy(zmq->zmq);
+}
+
+typedef struct {
+    char *target, *command, *arg;
+} Command;
+
+#define SPACES " \f\t\n\r"
+
+static int parse_command(Command *cmd, const char *command_str, void *log_ctx)
+{
+    const char **buf = &command_str;
+
+    cmd->target = av_get_token(buf, SPACES);
+    if (!cmd->target || !cmd->target[0]) {
+        av_log(log_ctx, AV_LOG_ERROR,
+               "No target specified in command '%s'\n", command_str);
+        return AVERROR(EINVAL);
+    }
+
+    cmd->command = av_get_token(buf, SPACES);
+    if (!cmd->command || !cmd->command[0]) {
+        av_log(log_ctx, AV_LOG_ERROR,
+               "No command specified in command '%s'\n", command_str);
+        return AVERROR(EINVAL);
+    }
+
+    cmd->arg = av_get_token(buf, SPACES);
+    return 0;
+}
+
+static int recv_msg(AVFilterContext *ctx, char **buf, int *buf_size)
+{
+    ZMQContext *zmq = ctx->priv;
+    zmq_msg_t msg;
+    int ret = 0;
+
+    if (zmq_msg_init(&msg) == -1) {
+        av_log(ctx, AV_LOG_WARNING,
+               "Could not initialize receive message: %s\n", zmq_strerror(errno));
+        return AVERROR_EXTERNAL;
+    }
+
+    if (zmq_msg_recv(&msg, zmq->responder, ZMQ_DONTWAIT) == -1) {
+        if (errno != EAGAIN)
+            av_log(ctx, AV_LOG_WARNING,
+                   "Could not receive message: %s\n", zmq_strerror(errno));
+        ret = AVERROR_EXTERNAL;
+        goto end;
+    }
+
+    *buf_size = zmq_msg_size(&msg) + 1;
+    *buf = av_malloc(*buf_size);
+    if (!*buf) {
+        ret = AVERROR(ENOMEM);
+        goto end;
+    }
+    memcpy(*buf, zmq_msg_data(&msg), *buf_size);
+    (*buf)[*buf_size-1] = 0;
+
+end:
+    zmq_msg_close(&msg);
+    return ret;
+}
+
+static int filter_frame(AVFilterLink *inlink, AVFrame *ref)
+{
+    AVFilterContext *ctx = inlink->dst;
+    ZMQContext *zmq = ctx->priv;
+
+    while (1) {
+        char cmd_buf[1024];
+        char *recv_buf, *send_buf;
+        int recv_buf_size;
+        Command cmd = {0};
+        int ret;
+
+        /* receive command */
+        if (recv_msg(ctx, &recv_buf, &recv_buf_size) < 0)
+            break;
+        zmq->command_count++;
+
+        /* parse command */
+        if (parse_command(&cmd, recv_buf, ctx) < 0) {
+            av_log(ctx, AV_LOG_ERROR, "Could not parse command #%d\n", zmq->command_count);
+            goto end;
+        }
+
+        /* process command */
+        av_log(ctx, AV_LOG_VERBOSE,
+               "Processing command #%d target:%s command:%s arg:%s\n",
+               zmq->command_count, cmd.target, cmd.command, cmd.arg);
+        ret = avfilter_graph_send_command(inlink->graph,
+                                          cmd.target, cmd.command, cmd.arg,
+                                          cmd_buf, sizeof(cmd_buf),
+                                          AVFILTER_CMD_FLAG_ONE);
+        send_buf = av_asprintf("%d %s%s%s",
+                               -ret, av_err2str(ret), cmd_buf[0] ? "\n" : "", cmd_buf);
+        if (!send_buf) {
+            ret = AVERROR(ENOMEM);
+            goto end;
+        }
+        av_log(ctx, AV_LOG_VERBOSE,
+               "Sending command reply for command #%d:\n%s\n",
+               zmq->command_count, send_buf);
+        if (zmq_send(zmq->responder, send_buf, strlen(send_buf), 0) == -1)
+            av_log(ctx, AV_LOG_ERROR, "Failed to send reply for command #%d: %s\n",
+                   zmq->command_count, zmq_strerror(ret));
+
+    end:
+        av_freep(&send_buf);
+        av_freep(&recv_buf);
+        recv_buf_size = 0;
+        av_freep(&cmd.target);
+        av_freep(&cmd.command);
+        av_freep(&cmd.arg);
+    }
+
+    return ff_filter_frame(ctx->outputs[0], ref);
+}
+
+#if CONFIG_ZMQ_FILTER
+
+#define zmq_options options
+AVFILTER_DEFINE_CLASS(zmq);
+
+static const AVFilterPad zmq_inputs[] = {
+    {
+        .name             = "default",
+        .type             = AVMEDIA_TYPE_VIDEO,
+        .filter_frame     = filter_frame,
+    },
+    { NULL }
+};
+
+static const AVFilterPad zmq_outputs[] = {
+    {
+        .name = "default",
+        .type = AVMEDIA_TYPE_VIDEO,
+    },
+    { NULL }
+};
+
+AVFilter avfilter_vf_zmq = {
+    .name        = "zmq",
+    .description = NULL_IF_CONFIG_SMALL("Receive commands through ZMQ and broker them to filters."),
+    .init        = init,
+    .uninit      = uninit,
+    .priv_size   = sizeof(ZMQContext),
+    .inputs      = zmq_inputs,
+    .outputs     = zmq_outputs,
+    .priv_class  = &zmq_class,
+};
+
+#endif
+
+#if CONFIG_AZMQ_FILTER
+
+#define azmq_options options
+AVFILTER_DEFINE_CLASS(azmq);
+
+static const AVFilterPad azmq_inputs[] = {
+    {
+        .name             = "default",
+        .type             = AVMEDIA_TYPE_AUDIO,
+        .get_audio_buffer = ff_null_get_audio_buffer,
+        .filter_frame     = filter_frame,
+    },
+    { NULL }
+};
+
+static const AVFilterPad azmq_outputs[] = {
+    {
+        .name = "default",
+        .type = AVMEDIA_TYPE_AUDIO,
+    },
+    { NULL }
+};
+
+AVFilter avfilter_af_azmq = {
+    .name        = "azmq",
+    .description = NULL_IF_CONFIG_SMALL("Receive commands through ZMQ and broker them to filters."),
+    .init        = init,
+    .uninit      = uninit,
+    .priv_size   = sizeof(ZMQContext),
+    .inputs      = azmq_inputs,
+    .outputs     = azmq_outputs,
+    .priv_class  = &azmq_class,
+};
+
+#endif