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  1. /*
  2.  * Icecast protocol for FFmpeg
  3.  * Copyright (c) 2014 Marvin Scholz
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22.  
  23. #include "libavutil/avstring.h"
  24. #include "libavutil/bprint.h"
  25. #include "libavutil/opt.h"
  26.  
  27. #include "avformat.h"
  28. #include "network.h"
  29.  
  30.  
  31. typedef struct IcecastContext {
  32.     const AVClass *class;
  33.     URLContext *hd;
  34.     int send_started;
  35.     char *user;
  36.     // Options
  37.     char *content_type;
  38.     char *description;
  39.     char *genre;
  40.     int legacy_icecast;
  41.     char *name;
  42.     char *pass;
  43.     int public;
  44.     char *url;
  45.     char *user_agent;
  46. } IcecastContext;
  47.  
  48. #define DEFAULT_ICE_USER "source"
  49.  
  50. #define NOT_EMPTY(s) (s && s[0])
  51.  
  52. #define OFFSET(x) offsetof(IcecastContext, x)
  53. #define E AV_OPT_FLAG_ENCODING_PARAM
  54.  
  55. static const AVOption options[] = {
  56.     { "ice_genre", "set stream genre", OFFSET(genre), AV_OPT_TYPE_STRING, { 0 }, 0, 0, E },
  57.     { "ice_name", "set stream description", OFFSET(name), AV_OPT_TYPE_STRING, { 0 }, 0, 0, E },
  58.     { "ice_description", "set stream description", OFFSET(description), AV_OPT_TYPE_STRING, { 0 }, 0, 0, E },
  59.     { "ice_url", "set stream website", OFFSET(url), AV_OPT_TYPE_STRING, { 0 }, 0, 0, E },
  60.     { "ice_public", "set if stream is public", OFFSET(public), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, E },
  61.     { "user_agent", "override User-Agent header", OFFSET(user_agent), AV_OPT_TYPE_STRING, { 0 }, 0, 0, E },
  62.     { "password", "set password", OFFSET(pass), AV_OPT_TYPE_STRING, { 0 }, 0, 0, E },
  63.     { "content_type", "set content-type, MUST be set if not audio/mpeg", OFFSET(content_type), AV_OPT_TYPE_STRING, { 0 }, 0, 0, E },
  64.     { "legacy_icecast", "use legacy SOURCE method, for Icecast < v2.4", OFFSET(legacy_icecast), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, E },
  65.     { NULL }
  66. };
  67.  
  68.  
  69. static void cat_header(AVBPrint *bp, const char key[], const char value[])
  70. {
  71.     if (NOT_EMPTY(value))
  72.         av_bprintf(bp, "%s: %s\r\n", key, value);
  73. }
  74.  
  75. static int icecast_close(URLContext *h)
  76. {
  77.     IcecastContext *s = h->priv_data;
  78.     if (s->hd)
  79.         ffurl_close(s->hd);
  80.     return 0;
  81. }
  82.  
  83. static int icecast_open(URLContext *h, const char *uri, int flags)
  84. {
  85.     IcecastContext *s = h->priv_data;
  86.  
  87.     // Dict to set options that we pass to the HTTP protocol
  88.     AVDictionary *opt_dict = NULL;
  89.  
  90.     // URI part variables
  91.     char h_url[1024], host[1024], auth[1024], path[1024];
  92.     char *headers = NULL, *user = NULL;
  93.     int port, ret;
  94.     AVBPrint bp;
  95.  
  96.     if (flags & AVIO_FLAG_READ)
  97.         return AVERROR(ENOSYS);
  98.  
  99.     av_bprint_init(&bp, 0, 1);
  100.  
  101.     // Build header strings
  102.     cat_header(&bp, "Ice-Name", s->name);
  103.     cat_header(&bp, "Ice-Description", s->description);
  104.     cat_header(&bp, "Ice-URL", s->url);
  105.     cat_header(&bp, "Ice-Genre", s->genre);
  106.     cat_header(&bp, "Ice-Public", s->public ? "1" : "0");
  107.     if (!av_bprint_is_complete(&bp)) {
  108.         ret = AVERROR(ENOMEM);
  109.         goto cleanup;
  110.     }
  111.     av_bprint_finalize(&bp, &headers);
  112.  
  113.     // Set options
  114.     av_dict_set(&opt_dict, "method", s->legacy_icecast ? "SOURCE" : "PUT", 0);
  115.     av_dict_set(&opt_dict, "auth_type", "basic", 0);
  116.     av_dict_set(&opt_dict, "headers", headers, 0);
  117.     av_dict_set(&opt_dict, "chunked_post", "0", 0);
  118.     av_dict_set(&opt_dict, "send_expect_100", s->legacy_icecast ? "0" : "1", 0);
  119.     if (NOT_EMPTY(s->content_type))
  120.         av_dict_set(&opt_dict, "content_type", s->content_type, 0);
  121.     else
  122.         av_dict_set(&opt_dict, "content_type", "audio/mpeg", 0);
  123.     if (NOT_EMPTY(s->user_agent))
  124.         av_dict_set(&opt_dict, "user_agent", s->user_agent, 0);
  125.  
  126.     // Parse URI
  127.     av_url_split(NULL, 0, auth, sizeof(auth), host, sizeof(host),
  128.                  &port, path, sizeof(path), uri);
  129.  
  130.     // Check for auth data in URI
  131.     if (auth[0]) {
  132.         char *sep = strchr(auth, ':');
  133.         if (sep) {
  134.             *sep = 0;
  135.             sep++;
  136.             if (s->pass) {
  137.                 av_free(s->pass);
  138.                 av_log(h, AV_LOG_WARNING, "Overwriting -password <pass> with URI password!\n");
  139.             }
  140.             if (!(s->pass = av_strdup(sep))) {
  141.                 ret = AVERROR(ENOMEM);
  142.                 goto cleanup;
  143.             }
  144.         }
  145.         if (!(user = av_strdup(auth))) {
  146.             ret = AVERROR(ENOMEM);
  147.             goto cleanup;
  148.         }
  149.     }
  150.  
  151.     // Build new authstring
  152.     snprintf(auth, sizeof(auth),
  153.              "%s:%s",
  154.              user ? user : DEFAULT_ICE_USER,
  155.              s->pass ? s->pass : "");
  156.  
  157.     // Check for mountpoint (path)
  158.     if (!path[0] || strcmp(path, "/") == 0) {
  159.         av_log(h, AV_LOG_ERROR, "No mountpoint (path) specified!\n");
  160.         ret = AVERROR(EIO);
  161.         goto cleanup;
  162.     }
  163.  
  164.     // Build new URI for passing to http protocol
  165.     ff_url_join(h_url, sizeof(h_url), "http", auth, host, port, "%s", path);
  166.     // Finally open http proto handler
  167.     ret = ffurl_open(&s->hd, h_url, AVIO_FLAG_READ_WRITE, NULL, &opt_dict);
  168.  
  169. cleanup:
  170.     av_freep(&user);
  171.     av_freep(&headers);
  172.     av_dict_free(&opt_dict);
  173.  
  174.     return ret;
  175. }
  176.  
  177. static int icecast_write(URLContext *h, const uint8_t *buf, int size)
  178. {
  179.     IcecastContext *s = h->priv_data;
  180.     if (!s->send_started) {
  181.         s->send_started = 1;
  182.         if (!s->content_type && size >= 8) {
  183.             static const uint8_t oggs[4] = { 0x4F, 0x67, 0x67, 0x53 };
  184.             static const uint8_t webm[4] = { 0x1A, 0x45, 0xDF, 0xA3 };
  185.             static const uint8_t opus[8] = { 0x4F, 0x70, 0x75, 0x73, 0x48, 0x65, 0x61, 0x64 };
  186.             if (memcmp(buf, oggs, sizeof(oggs)) == 0) {
  187.                 av_log(h, AV_LOG_WARNING, "Streaming Ogg but appropriate content type NOT set!\n");
  188.                 av_log(h, AV_LOG_WARNING, "Set it with -content_type application/ogg\n");
  189.             } else if (memcmp(buf, opus, sizeof(opus)) == 0) {
  190.                 av_log(h, AV_LOG_WARNING, "Streaming Opus but appropriate content type NOT set!\n");
  191.                 av_log(h, AV_LOG_WARNING, "Set it with -content_type audio/ogg\n");
  192.             } else if (memcmp(buf, webm, sizeof(webm)) == 0) {
  193.                 av_log(h, AV_LOG_WARNING, "Streaming WebM but appropriate content type NOT set!\n");
  194.                 av_log(h, AV_LOG_WARNING, "Set it with -content_type video/webm\n");
  195.             } else {
  196.                 av_log(h, AV_LOG_WARNING, "It seems you are streaming an unsupported format.\n");
  197.                 av_log(h, AV_LOG_WARNING, "It might work, but is not officially supported in Icecast!\n");
  198.             }
  199.         }
  200.     }
  201.     return ffurl_write(s->hd, buf, size);
  202. }
  203.  
  204. static const AVClass icecast_context_class = {
  205.     .class_name     = "icecast",
  206.     .item_name      = av_default_item_name,
  207.     .option         = options,
  208.     .version        = LIBAVUTIL_VERSION_INT,
  209. };
  210.  
  211. URLProtocol ff_icecast_protocol = {
  212.     .name            = "icecast",
  213.     .url_open        = icecast_open,
  214.     .url_write       = icecast_write,
  215.     .url_close       = icecast_close,
  216.     .priv_data_size  = sizeof(IcecastContext),
  217.     .priv_data_class = &icecast_context_class,
  218.     .flags           = URL_PROTOCOL_FLAG_NETWORK,
  219. };
  220.