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ffmpeg/libavformat/librist.c

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/*
* 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/avstring.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>
#include <librist/version.h>
// RIST_MAX_PACKET_SIZE - 28 minimum protocol overhead
#define MAX_PAYLOAD_SIZE (10000-28)
#define FIFO_SIZE_DEFAULT 8192
typedef struct RISTContext {
const AVClass *class;
int profile;
int buffer_size;
int packet_size;
int log_level;
int encryption;
int fifo_size;
int overrun_nonfatal;
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, .unit = "profile" },
{ "simple", NULL, 0, AV_OPT_TYPE_CONST, {.i64=RIST_PROFILE_SIMPLE}, 0, 0, .flags = D|E, .unit = "profile" },
{ "main", NULL, 0, AV_OPT_TYPE_CONST, {.i64=RIST_PROFILE_MAIN}, 0, 0, .flags = D|E, .unit = "profile" },
{ "advanced", NULL, 0, AV_OPT_TYPE_CONST, {.i64=RIST_PROFILE_ADVANCED}, 0, 0, .flags = D|E, .unit = "profile" },
{ "buffer_size", "set buffer_size in ms", OFFSET(buffer_size), AV_OPT_TYPE_INT, {.i64=0}, 0, 30000, .flags = D|E },
{ "fifo_size", "set fifo buffer size, must be a power of 2", OFFSET(fifo_size), AV_OPT_TYPE_INT, {.i64=FIFO_SIZE_DEFAULT}, 32, 262144, .flags = D|E },
{ "overrun_nonfatal", "survive in case of receiving fifo buffer overrun", OFFSET(overrun_nonfatal), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, D },
{ "pkt_size", "set packet size", OFFSET(packet_size), AV_OPT_TYPE_INT, {.i64=1316}, 1, MAX_PAYLOAD_SIZE, .flags = D|E },
{ "log_level", "set loglevel", OFFSET(log_level), AV_OPT_TYPE_INT, {.i64=RIST_LOG_INFO}, -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_INFO; break;
case RIST_LOG_INFO: level = AV_LOG_VERBOSE; break;
case RIST_LOG_DEBUG: level = AV_LOG_DEBUG; break;
case RIST_LOG_DISABLE: level = AV_LOG_QUIET; break;
default: level = AV_LOG_WARNING;
}
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);
s->logging_settings = (struct rist_logging_settings)LOGGING_SETTINGS_INITIALIZER;
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) {
h->max_packet_size = s->packet_size;
ret = rist_sender_create(&s->ctx, s->profile, 0, logging_settings);
}
if (ret < 0)
goto err;
if (flags & AVIO_FLAG_READ) {
h->max_packet_size = MAX_PAYLOAD_SIZE;
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_address2(uri, &peer_config);
if (ret < 0)
goto err;
if (flags & AVIO_FLAG_READ) {
ret = rist_receiver_set_output_fifo_size(s->ctx, s->fifo_size);
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, RIST_MAX_STRING_SHORT);
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;
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;
int ret;
struct rist_data_block *data_block;
ret = rist_receiver_data_read2(s->ctx, &data_block, POLLING_TIME);
if (ret < 0)
return risterr2ret(ret);
if (ret == 0)
return AVERROR(EAGAIN);
if (data_block->payload_len > MAX_PAYLOAD_SIZE) {
rist_receiver_data_block_free2(&data_block);
return AVERROR_EXTERNAL;
}
if (data_block->flags & RIST_DATA_FLAGS_OVERFLOW) {
if (!s->overrun_nonfatal) {
av_log(h, AV_LOG_ERROR, "Fifo buffer overrun. "
"To avoid, increase fifo_size option. "
"To survive in such case, use overrun_nonfatal option\n");
size = AVERROR(EIO);
goto out_free;
}
}
size = data_block->payload_len;
memcpy(buf, data_block->payload, size);
out_free:
rist_receiver_data_block_free2(&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,
};
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