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/*
* Icecast protocol for Libav
* Copyright (c) 2014 Marvin Scholz
*
* This file is part of Libav.
*
* Libav 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.
*
* Libav 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 Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/avstring.h"
#include "libavutil/opt.h"
#include "avformat.h"
#include "network.h"
typedef struct IcecastContext {
const AVClass *class;
URLContext *hd;
int send_started;
char *user;
// Options
char *content_type;
char *description;
char *genre;
int legacy_icecast;
char *name;
char *pass;
int public;
char *url;
char *user_agent;
} IcecastContext;
#define DEFAULT_ICE_USER "source"
#define NOT_EMPTY(s) (s && s[0])
#define OFFSET(x) offsetof(IcecastContext, x)
#define E AV_OPT_FLAG_ENCODING_PARAM
static const AVOption options[] = {
{ "ice_genre", "set stream genre", OFFSET(genre), AV_OPT_TYPE_STRING, { 0 }, 0, 0, E },
{ "ice_name", "set stream description", OFFSET(name), AV_OPT_TYPE_STRING, { 0 }, 0, 0, E },
{ "ice_description", "set stream description", OFFSET(description), AV_OPT_TYPE_STRING, { 0 }, 0, 0, E },
{ "ice_url", "set stream website", OFFSET(url), AV_OPT_TYPE_STRING, { 0 }, 0, 0, E },
{ "ice_public", "set if stream is public", OFFSET(public), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, E },
{ "user_agent", "override User-Agent header", OFFSET(user_agent), AV_OPT_TYPE_STRING, { 0 }, 0, 0, E },
{ "password", "set password", OFFSET(pass), AV_OPT_TYPE_STRING, { 0 }, 0, 0, E },
{ "content_type", "set content-type, MUST be set if not audio/mpeg", OFFSET(content_type), AV_OPT_TYPE_STRING, { 0 }, 0, 0, E },
{ "legacy_icecast", "use legacy SOURCE method, for Icecast < v2.4", OFFSET(legacy_icecast), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, E },
{ NULL }
};
static char *cat_header(char buf[], const char key[], const char value[])
{
if (NOT_EMPTY(value)) {
int len = strlen(key) + strlen(value) + 5;
int is_first = !buf;
char *tmp = NULL;
if (buf)
len += strlen(buf);
if (!(tmp = av_realloc(buf, len))) {
av_freep(&buf);
return NULL;
} else {
buf = tmp;
}
if (is_first)
*buf = '\0';
av_strlcatf(buf, len, "%s: %s\r\n", key, value);
}
return buf;
}
static int icecast_close(URLContext *h)
{
IcecastContext *s = h->priv_data;
if (s->hd)
ffurl_close(s->hd);
return 0;
}
static int icecast_open(URLContext *h, const char *uri, int flags)
{
IcecastContext *s = h->priv_data;
// Dict to set options that we pass to the HTTP protocol
AVDictionary *opt_dict = NULL;
// URI part variables
char h_url[1024], host[1024], auth[1024], path[1024];
char *headers = NULL, *user = NULL;
int port, ret;
if (flags & AVIO_FLAG_READ)
return AVERROR(ENOSYS);
// Build header strings
headers = cat_header(headers, "Ice-Name", s->name);
headers = cat_header(headers, "Ice-Description", s->description);
headers = cat_header(headers, "Ice-URL", s->url);
headers = cat_header(headers, "Ice-Genre", s->genre);
headers = cat_header(headers, "Ice-Public", s->public ? "1" : "0");
if (!headers) {
ret = AVERROR(ENOMEM);
goto cleanup;
}
// Set options
av_dict_set(&opt_dict, "method", s->legacy_icecast ? "SOURCE" : "PUT", 0);
av_dict_set(&opt_dict, "auth_type", "basic", 0);
av_dict_set(&opt_dict, "headers", headers, 0);
av_dict_set(&opt_dict, "chunked_post", "0", 0);
av_dict_set(&opt_dict, "send_expect_100", s->legacy_icecast ? "0" : "1", 0);
if (NOT_EMPTY(s->content_type))
av_dict_set(&opt_dict, "content_type", s->content_type, 0);
else
av_dict_set(&opt_dict, "content_type", "audio/mpeg", 0);
if (NOT_EMPTY(s->user_agent))
av_dict_set(&opt_dict, "user_agent", s->user_agent, 0);
// Parse URI
av_url_split(NULL, 0, auth, sizeof(auth), host, sizeof(host),
&port, path, sizeof(path), uri);
// Check for auth data in URI
if (auth[0]) {
char *sep = strchr(auth,':');
if (sep) {
*sep = 0;
sep++;
if (s->pass) {
av_free(s->pass);
av_log(h, AV_LOG_WARNING, "Overwriting -password <pass> with URI password!\n");
}
if (!(s->pass = av_strdup(sep))) {
ret = AVERROR(ENOMEM);
goto cleanup;
}
}
if (!(user = av_strdup(auth))) {
ret = AVERROR(ENOMEM);
goto cleanup;
}
}
// Build new authstring
snprintf(auth, sizeof(auth),
"%s:%s",
user ? user : DEFAULT_ICE_USER,
s->pass ? s->pass : "");
// Check for mountpoint (path)
if (!path[0] || strcmp(path, "/") == 0) {
av_log(h, AV_LOG_ERROR, "No mountpoint (path) specified!\n");
ret = AVERROR(EIO);
goto cleanup;
}
// Build new URI for passing to http protocol
ff_url_join(h_url, sizeof(h_url), "http", auth, host, port, "%s", path);
// Finally open http proto handler
ret = ffurl_open(&s->hd, h_url, AVIO_FLAG_READ_WRITE, NULL, &opt_dict,
h->protocols);
cleanup:
// Free variables
av_freep(&user);
av_freep(&headers);
av_dict_free(&opt_dict);
return ret;
}
static int icecast_write(URLContext *h, const uint8_t *buf, int size)
{
IcecastContext *s = h->priv_data;
if (!s->send_started) {
s->send_started = 1;
if (!s->content_type && size >= 8) {
static const uint8_t oggs[4] = { 0x4F, 0x67, 0x67, 0x53 };
static const uint8_t webm[4] = { 0x1A, 0x45, 0xDF, 0xA3 };
static const uint8_t opus[8] = { 0x4F, 0x70, 0x75, 0x73, 0x48, 0x65, 0x61, 0x64 };
if (memcmp(buf, oggs, sizeof(oggs)) == 0) {
av_log(h, AV_LOG_WARNING, "Streaming Ogg but appropriate content type NOT set!\n");
av_log(h, AV_LOG_WARNING, "Set it with -content_type application/ogg\n");
} else if (memcmp(buf, opus, sizeof(opus)) == 0) {
av_log(h, AV_LOG_WARNING, "Streaming Opus but appropriate content type NOT set!\n");
av_log(h, AV_LOG_WARNING, "Set it with -content_type audio/ogg\n");
} else if (memcmp(buf, webm, sizeof(webm)) == 0) {
av_log(h, AV_LOG_WARNING, "Streaming WebM but appropriate content type NOT set!\n");
av_log(h, AV_LOG_WARNING, "Set it with -content_type video/webm\n");
} else {
av_log(h, AV_LOG_WARNING, "It seems you are streaming an unsupported format.\n");
av_log(h, AV_LOG_WARNING, "It might work, but is not officially supported in Icecast!\n");
}
}
}
return ffurl_write(s->hd, buf, size);
}
static const AVClass icecast_context_class = {
.class_name = "icecast",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
const URLProtocol ff_icecast_protocol = {
.name = "icecast",
.url_open = icecast_open,
.url_write = icecast_write,
.url_close = icecast_close,
.priv_data_size = sizeof(IcecastContext),
.priv_data_class = &icecast_context_class,
.flags = URL_PROTOCOL_FLAG_NETWORK,
};
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