libavformat: add librist protocol

This work is sponsored by Open Broadcast Systems.

Signed-off-by: Paul B Mahol <onemda@gmail.com>

1 files changed, 236 insertions, 0 deletions

diff --git a/libavformat/librist.c b/libavformat/librist.c
new file mode 100644
index 0000000000..789cefda36
--- /dev/null
+++ b/libavformat/librist.c
@@ -0,0 +1,236 @@
+/*
+ * 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
+ * Reliable Internet Streaming Transport protocol
+ */
+
+#include "libavutil/avassert.h"
+#include "libavutil/opt.h"
+#include "libavutil/parseutils.h"
+#include "libavutil/time.h"
+
+#include "avformat.h"
+#include "internal.h"
+#include "network.h"
+#include "os_support.h"
+#include "url.h"
+
+#include <librist/librist.h>
+
+typedef struct RISTContext {
+    const AVClass *class;
+
+    int queue_count;
+    int profile;
+    int buffer_size;
+    int log_level;
+    int encryption;
+    char *secret;
+
+    struct rist_logging_settings logging_settings;
+    struct rist_peer_config peer_config;
+
+    struct rist_peer *peer;
+    struct rist_ctx *ctx;
+} RISTContext;
+
+#define D AV_OPT_FLAG_DECODING_PARAM
+#define E AV_OPT_FLAG_ENCODING_PARAM
+#define OFFSET(x) offsetof(RISTContext, x)
+static const AVOption librist_options[] = {
+    { "rist_profile","set profile",     OFFSET(profile),     AV_OPT_TYPE_INT,   {.i64=RIST_PROFILE_MAIN},     0, 2, .flags = D|E, "profile" },
+    { "simple",      NULL,              0,                   AV_OPT_TYPE_CONST, {.i64=RIST_PROFILE_SIMPLE},   0, 0, .flags = D|E, "profile" },
+    { "main",        NULL,              0,                   AV_OPT_TYPE_CONST, {.i64=RIST_PROFILE_MAIN},     0, 0, .flags = D|E, "profile" },
+    { "advanced",    NULL,              0,                   AV_OPT_TYPE_CONST, {.i64=RIST_PROFILE_ADVANCED}, 0, 0, .flags = D|E, "profile" },
+    { "buffer_size", "set buffer_size", OFFSET(buffer_size), AV_OPT_TYPE_INT,   {.i64=0},                     0, INT_MAX, .flags = D|E },
+    { "log_level",   "set loglevel",    OFFSET(log_level),   AV_OPT_TYPE_INT,   {.i64=-1},                   -1, INT_MAX, .flags = D|E },
+    { "secret", "set encryption secret",OFFSET(secret),      AV_OPT_TYPE_STRING,{.str=NULL},                  0, 0,       .flags = D|E },
+    { "encryption","set encryption type",OFFSET(encryption), AV_OPT_TYPE_INT   ,{.i64=0},                     0, INT_MAX, .flags = D|E },
+    { NULL }
+};
+
+static int risterr2ret(int err)
+{
+    switch (err) {
+    case RIST_ERR_MALLOC:
+        return AVERROR(ENOMEM);
+    default:
+        return AVERROR_EXTERNAL;
+    }
+}
+
+static int log_cb(void *arg, enum rist_log_level log_level, const char *msg)
+{
+    int level;
+
+    switch (log_level) {
+    case RIST_LOG_ERROR:    level = AV_LOG_ERROR;   break;
+    case RIST_LOG_WARN:     level = AV_LOG_WARNING; break;
+    case RIST_LOG_NOTICE:   level = AV_LOG_VERBOSE; break;
+    case RIST_LOG_INFO:     level = AV_LOG_INFO;    break;
+    case RIST_LOG_DEBUG:    level = AV_LOG_DEBUG;   break;
+    case RIST_LOG_DISABLE:  level = AV_LOG_QUIET;   break;
+    case RIST_LOG_SIMULATE: level = AV_LOG_TRACE;   break;
+    default: level = AV_LOG_PANIC;
+    }
+
+    av_log(arg, level, "%s", msg);
+
+    return 0;
+}
+
+static int librist_close(URLContext *h)
+{
+    RISTContext *s = h->priv_data;
+    int ret = 0;
+
+    s->peer = NULL;
+
+    if (s->ctx)
+        ret = rist_destroy(s->ctx);
+    s->ctx = NULL;
+
+    return risterr2ret(ret);
+}
+
+static int librist_open(URLContext *h, const char *uri, int flags)
+{
+    RISTContext *s = h->priv_data;
+    struct rist_logging_settings *logging_settings = &s->logging_settings;
+    struct rist_peer_config *peer_config = &s->peer_config;
+    int ret;
+
+    if ((flags & AVIO_FLAG_READ_WRITE) == AVIO_FLAG_READ_WRITE)
+        return AVERROR(EINVAL);
+
+    ret = rist_logging_set(&logging_settings, s->log_level, log_cb, h, NULL, NULL);
+    if (ret < 0)
+        return risterr2ret(ret);
+
+    if (flags & AVIO_FLAG_WRITE)
+        ret = rist_sender_create(&s->ctx, s->profile, 0, logging_settings);
+    if (ret < 0)
+        goto err;
+
+    if (flags & AVIO_FLAG_READ)
+        ret = rist_receiver_create(&s->ctx, s->profile, logging_settings);
+    if (ret < 0)
+        goto err;
+
+    ret = rist_peer_config_defaults_set(peer_config);
+    if (ret < 0)
+        goto err;
+
+    ret = rist_parse_address(uri, (const struct rist_peer_config **)&peer_config);
+    if (ret < 0)
+        goto err;
+
+    if (((s->encryption == 128 || s->encryption == 256) && !s->secret) ||
+        ((peer_config->key_size == 128 || peer_config->key_size == 256) && !peer_config->secret[0])) {
+        av_log(h, AV_LOG_ERROR, "secret is mandatory if encryption is enabled\n");
+        librist_close(h);
+        return AVERROR(EINVAL);
+    }
+
+    if (s->secret && peer_config->secret[0] == 0)
+        av_strlcpy(peer_config->secret, s->secret, FFMIN(RIST_MAX_STRING_SHORT - 1, strlen(s->secret)));
+
+    if (s->secret && (s->encryption == 128 || s->encryption == 256))
+        peer_config->key_size = s->encryption;
+
+    if (s->buffer_size) {
+        peer_config->recovery_length_min = s->buffer_size;
+        peer_config->recovery_length_max = s->buffer_size;
+    }
+
+    ret = rist_peer_create(s->ctx, &s->peer, &s->peer_config);
+    if (ret < 0)
+        goto err;
+
+    ret = rist_start(s->ctx);
+    if (ret < 0)
+        goto err;
+
+    h->max_packet_size = 9968;
+
+    return 0;
+
+err:
+    librist_close(h);
+
+    return risterr2ret(ret);
+}
+
+static int librist_read(URLContext *h, uint8_t *buf, int size)
+{
+    RISTContext *s = h->priv_data;
+    const struct rist_data_block *data_block;
+    int ret;
+
+    ret = rist_receiver_data_read(s->ctx, &data_block, s->queue_count <= 0 ? POLLING_TIME : 0);
+    if (ret < 0)
+        return risterr2ret(ret);
+
+    if (ret == 0 || data_block->payload_len <= 0)
+        return 0;
+
+    s->queue_count = ret - 1;
+    size = data_block->payload_len;
+
+    memcpy(buf, data_block->payload, size);
+    rist_receiver_data_block_free((struct rist_data_block**)&data_block);
+
+    return size;
+}
+
+static int librist_write(URLContext *h, const uint8_t *buf, int size)
+{
+    RISTContext *s = h->priv_data;
+    struct rist_data_block data_block = { 0 };
+    int ret;
+
+    data_block.ts_ntp = 0;
+    data_block.payload = buf;
+    data_block.payload_len = size;
+
+    ret = rist_sender_data_write(s->ctx, &data_block);
+    if (ret < 0)
+        return risterr2ret(ret);
+
+    return ret;
+}
+
+static const AVClass librist_class = {
+    .class_name = "librist",
+    .item_name  = av_default_item_name,
+    .option     = librist_options,
+    .version    = LIBAVUTIL_VERSION_INT,
+};
+
+const URLProtocol ff_librist_protocol = {
+    .name                = "rist",
+    .url_open            = librist_open,
+    .url_read            = librist_read,
+    .url_write           = librist_write,
+    .url_close           = librist_close,
+    .priv_data_size      = sizeof(RISTContext),
+    .flags               = URL_PROTOCOL_FLAG_NETWORK,
+    .priv_data_class     = &librist_class,
+};