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eb9244f202
Icecast is basically a convenience wrapper around the HTTP protocol. Signed-off-by: Martin Storsjö <martin@martin.st>
229 lines
7.6 KiB
C
229 lines
7.6 KiB
C
/*
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* Icecast protocol for Libav
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* Copyright (c) 2014 Marvin Scholz
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/avstring.h"
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#include "libavutil/opt.h"
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#include "avformat.h"
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#include "network.h"
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typedef struct IcecastContext {
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const AVClass *class;
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URLContext *hd;
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int send_started;
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char *user;
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// Options
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char *content_type;
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char *description;
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char *genre;
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int legacy_icecast;
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char *name;
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char *pass;
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int public;
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char *url;
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char *user_agent;
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} IcecastContext;
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#define DEFAULT_ICE_USER "source"
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#define NOT_EMPTY(s) (s && s[0])
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#define OFFSET(x) offsetof(IcecastContext, x)
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#define E AV_OPT_FLAG_ENCODING_PARAM
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static const AVOption options[] = {
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{ "ice_genre", "set stream genre", OFFSET(genre), AV_OPT_TYPE_STRING, { 0 }, 0, 0, E },
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{ "ice_name", "set stream description", OFFSET(name), AV_OPT_TYPE_STRING, { 0 }, 0, 0, E },
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{ "ice_description", "set stream description", OFFSET(description), AV_OPT_TYPE_STRING, { 0 }, 0, 0, E },
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{ "ice_url", "set stream website", OFFSET(url), AV_OPT_TYPE_STRING, { 0 }, 0, 0, E },
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{ "ice_public", "set if stream is public", OFFSET(public), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, E },
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{ "user_agent", "override User-Agent header", OFFSET(user_agent), AV_OPT_TYPE_STRING, { 0 }, 0, 0, E },
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{ "password", "set password", OFFSET(pass), AV_OPT_TYPE_STRING, { 0 }, 0, 0, E },
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{ "content_type", "set content-type, MUST be set if not audio/mpeg", OFFSET(content_type), AV_OPT_TYPE_STRING, { 0 }, 0, 0, E },
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{ "legacy_icecast", "use legacy SOURCE method, for Icecast < v2.4", OFFSET(legacy_icecast), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, E },
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{ NULL }
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};
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static char *cat_header(char buf[], const char key[], const char value[])
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{
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if (NOT_EMPTY(value)) {
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int len = strlen(key) + strlen(value) + 5;
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int is_first = !buf;
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char *tmp = NULL;
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if (buf)
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len += strlen(buf);
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if (!(tmp = av_realloc(buf, len))) {
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av_freep(&buf);
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return NULL;
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} else {
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buf = tmp;
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}
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if (is_first)
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*buf = '\0';
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av_strlcatf(buf, len, "%s: %s\r\n", key, value);
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}
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return buf;
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}
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static int icecast_close(URLContext *h)
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{
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IcecastContext *s = h->priv_data;
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if (s->hd)
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ffurl_close(s->hd);
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return 0;
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}
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static int icecast_open(URLContext *h, const char *uri, int flags)
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{
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IcecastContext *s = h->priv_data;
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// Dict to set options that we pass to the HTTP protocol
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AVDictionary *opt_dict = NULL;
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// URI part variables
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char h_url[1024], host[1024], auth[1024], path[1024];
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char *headers = NULL, *user = NULL;
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int port, ret;
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if (flags & AVIO_FLAG_READ)
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return AVERROR(ENOSYS);
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// Build header strings
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headers = cat_header(headers, "Ice-Name", s->name);
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headers = cat_header(headers, "Ice-Description", s->description);
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headers = cat_header(headers, "Ice-URL", s->url);
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headers = cat_header(headers, "Ice-Genre", s->genre);
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headers = cat_header(headers, "Ice-Public", s->public ? "1" : "0");
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if (!headers) {
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ret = AVERROR(ENOMEM);
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goto cleanup;
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}
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// Set options
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av_dict_set(&opt_dict, "method", s->legacy_icecast ? "SOURCE" : "PUT", 0);
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av_dict_set(&opt_dict, "auth_type", "basic", 0);
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av_dict_set(&opt_dict, "headers", headers, 0);
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if (NOT_EMPTY(s->content_type))
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av_dict_set(&opt_dict, "content_type", s->content_type, 0);
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if (NOT_EMPTY(s->user_agent))
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av_dict_set(&opt_dict, "user_agent", s->user_agent, 0);
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// Parse URI
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av_url_split(NULL, 0, auth, sizeof(auth), host, sizeof(host),
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&port, path, sizeof(path), uri);
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// Check for auth data in URI
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if (auth[0]) {
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char *sep = strchr(auth,':');
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if (sep) {
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*sep = 0;
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sep++;
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if (s->pass) {
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av_free(s->pass);
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av_log(h, AV_LOG_WARNING, "Overwriting -password <pass> with URI password!\n");
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}
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if (!(s->pass = av_strdup(sep))) {
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ret = AVERROR(ENOMEM);
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goto cleanup;
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}
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}
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if (!(user = av_strdup(auth))) {
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ret = AVERROR(ENOMEM);
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goto cleanup;
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}
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}
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// Build new authstring
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snprintf(auth, sizeof(auth),
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"%s:%s",
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user ? user : DEFAULT_ICE_USER,
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s->pass ? s->pass : "");
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// Check for mountpoint (path)
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if (!path[0] || strcmp(path, "/") == 0) {
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av_log(h, AV_LOG_ERROR, "No mountpoint (path) specified!\n");
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ret = AVERROR(EIO);
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goto cleanup;
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}
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// Build new URI for passing to http protocol
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ff_url_join(h_url, sizeof(h_url), "http", auth, host, port, "%s", path);
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// Finally open http proto handler
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ret = ffurl_open(&s->hd, h_url, AVIO_FLAG_READ_WRITE, NULL, &opt_dict);
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cleanup:
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// Free variables
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av_freep(&user);
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av_freep(&headers);
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av_dict_free(&opt_dict);
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return ret;
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}
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static int icecast_write(URLContext *h, const uint8_t *buf, int size)
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{
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IcecastContext *s = h->priv_data;
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if (!s->send_started) {
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s->send_started = 1;
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if (!s->content_type && size >= 8) {
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static const uint8_t oggs[4] = { 0x4F, 0x67, 0x67, 0x53 };
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static const uint8_t webm[4] = { 0x1A, 0x45, 0xDF, 0xA3 };
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static const uint8_t opus[8] = { 0x4F, 0x70, 0x75, 0x73, 0x48, 0x65, 0x61, 0x64 };
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if (memcmp(buf, oggs, sizeof(oggs)) == 0) {
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av_log(h, AV_LOG_WARNING, "Streaming Ogg but appropriate content type NOT set!\n");
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av_log(h, AV_LOG_WARNING, "Set it with -content_type application/ogg\n");
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} else if (memcmp(buf, opus, sizeof(opus)) == 0) {
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av_log(h, AV_LOG_WARNING, "Streaming Opus but appropriate content type NOT set!\n");
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av_log(h, AV_LOG_WARNING, "Set it with -content_type audio/ogg\n");
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} else if (memcmp(buf, webm, sizeof(webm)) == 0) {
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av_log(h, AV_LOG_WARNING, "Streaming WebM but appropriate content type NOT set!\n");
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av_log(h, AV_LOG_WARNING, "Set it with -content_type video/webm\n");
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} else {
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av_log(h, AV_LOG_WARNING, "It seems you are streaming an unsupported format.\n");
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av_log(h, AV_LOG_WARNING, "It might work, but is not officially supported in Icecast!\n");
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}
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}
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}
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return ffurl_write(s->hd, buf, size);
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}
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static const AVClass icecast_context_class = {
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.class_name = "icecast",
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.item_name = av_default_item_name,
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.option = options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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URLProtocol ff_icecast_protocol = {
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.name = "icecast",
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.url_open = icecast_open,
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.url_write = icecast_write,
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.url_close = icecast_close,
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.priv_data_size = sizeof(IcecastContext),
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.priv_data_class = &icecast_context_class,
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.flags = URL_PROTOCOL_FLAG_NETWORK,
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};
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