format_mp3.c 11.5 KB
Newer Older
1
/* -*- c-basic-offset: 4; -*- */
Michael Smith's avatar
Michael Smith committed
2 3
/* format_mp3.c
**
Michael Smith's avatar
Michael Smith committed
4
** format plugin for mp3
Michael Smith's avatar
Michael Smith committed
5 6 7
**
*/

8 9 10 11
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

Michael Smith's avatar
Michael Smith committed
12 13 14
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
Karl Heyes's avatar
Karl Heyes committed
15 16 17
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif
Michael Smith's avatar
Michael Smith committed
18

brendan's avatar
brendan committed
19 20 21 22
#ifdef HAVE_ALLOCA_H
#include <alloca.h>
#endif

Michael Smith's avatar
Michael Smith committed
23
#include "refbuf.h"
Michael Smith's avatar
Michael Smith committed
24 25
#include "source.h"
#include "client.h"
Michael Smith's avatar
Michael Smith committed
26 27 28

#include "stats.h"
#include "format.h"
Michael Smith's avatar
Michael Smith committed
29 30 31 32 33 34
#include "httpp/httpp.h"

#include "logging.h"

#include "format_mp3.h"

Ed "oddsock" Zaleski's avatar
Ed "oddsock" Zaleski committed
35 36 37
#ifdef WIN32
#define strcasecmp stricmp
#define strncasecmp strnicmp
Ed "oddsock" Zaleski's avatar
Ed "oddsock" Zaleski committed
38
#define alloca _alloca
Ed "oddsock" Zaleski's avatar
Ed "oddsock" Zaleski committed
39 40
#endif

Michael Smith's avatar
Michael Smith committed
41 42
#define CATMODULE "format-mp3"

43 44 45
/* Note that this seems to be 8192 in shoutcast - perhaps we want to be the
 * same for compability with crappy clients?
 */
Michael Smith's avatar
Michael Smith committed
46
#define ICY_METADATA_INTERVAL 16000
Michael Smith's avatar
Michael Smith committed
47

48 49 50 51
static void format_mp3_free_plugin(format_plugin_t *self);
static int format_mp3_get_buffer(format_plugin_t *self, char *data, 
        unsigned long len, refbuf_t **buffer);
static refbuf_queue_t *format_mp3_get_predata(format_plugin_t *self);
Michael Smith's avatar
Michael Smith committed
52 53 54 55 56 57 58 59
static void *format_mp3_create_client_data(format_plugin_t *self,
        source_t *source, client_t *client);
static int format_mp3_write_buf_to_client(format_plugin_t *self,
        client_t *client, unsigned char *buf, int len);
static void format_mp3_send_headers(format_plugin_t *self, 
        source_t *source, client_t *client);

typedef struct {
Michael Smith's avatar
Michael Smith committed
60
   int use_metadata;
Michael Smith's avatar
Michael Smith committed
61 62
   int interval;
   int offset;
Michael Smith's avatar
Michael Smith committed
63 64
   int metadata_age;
   int metadata_offset;
Michael Smith's avatar
Michael Smith committed
65
} mp3_client_data;
Ed "oddsock" Zaleski's avatar
Ed "oddsock" Zaleski committed
66

67
format_plugin_t *format_mp3_get_plugin(http_parser_t *parser)
Michael Smith's avatar
Michael Smith committed
68
{
69
    char *metadata;
70
    format_plugin_t *plugin;
Michael Smith's avatar
Michael Smith committed
71
    mp3_state *state = calloc(1, sizeof(mp3_state));
Michael Smith's avatar
Michael Smith committed
72

73
    plugin = (format_plugin_t *)malloc(sizeof(format_plugin_t));
Michael Smith's avatar
Michael Smith committed
74

75 76 77 78
    plugin->type = FORMAT_TYPE_MP3;
    plugin->has_predata = 0;
    plugin->get_buffer = format_mp3_get_buffer;
    plugin->get_predata = format_mp3_get_predata;
Michael Smith's avatar
Michael Smith committed
79
    plugin->write_buf_to_client = format_mp3_write_buf_to_client;
80
    plugin->create_client_data = format_mp3_create_client_data;
Michael Smith's avatar
Michael Smith committed
81
    plugin->client_send_headers = format_mp3_send_headers;
82
    plugin->free_plugin = format_mp3_free_plugin;
83
    plugin->format_description = "MP3 audio";
Michael Smith's avatar
Michael Smith committed
84

85
    plugin->_state = state;
Michael Smith's avatar
Michael Smith committed
86

Michael Smith's avatar
Michael Smith committed
87 88
    state->metadata_age = 0;
    state->metadata = strdup("");
Michael Smith's avatar
Michael Smith committed
89
    thread_mutex_create(&(state->lock));
Michael Smith's avatar
Michael Smith committed
90

91 92 93 94
    metadata = httpp_getvar(parser, "icy-metaint");
    if(metadata)
        state->inline_metadata_interval = atoi(metadata);

95
    return plugin;
Michael Smith's avatar
Michael Smith committed
96 97
}

Michael Smith's avatar
Michael Smith committed
98 99 100 101 102 103 104 105 106
static int send_metadata(client_t *client, mp3_client_data *client_state,
        mp3_state *source_state)
{
    int send_metadata;
    int len_byte;
    int len;
    unsigned char *buf;
    int ret;
    int source_age;
107 108
    char    *fullmetadata = NULL;
    int    fullmetadata_size = 0;
Michael Smith's avatar
Michael Smith committed
109 110 111 112 113 114 115 116

    thread_mutex_lock(&(source_state->lock));
    if(source_state->metadata == NULL) {
        /* Shouldn't be possible */
        thread_mutex_unlock(&(source_state->lock));
        return 0;
    }

117 118 119 120 121 122 123
    if(source_state->metadata_raw) {
        fullmetadata_size = strlen(source_state->metadata);
        fullmetadata = source_state->metadata;
    }
    else {
        fullmetadata_size = strlen(source_state->metadata) + 
            strlen("StreamTitle='';StreamUrl=''") + 1;
124

125
        fullmetadata = alloca(fullmetadata_size);
126

127 128 129
        sprintf(fullmetadata, "StreamTitle='%s';StreamUrl=''", 
                source_state->metadata);
    }
130

Michael Smith's avatar
Michael Smith committed
131
    source_age = source_state->metadata_age;
Michael Smith's avatar
Michael Smith committed
132 133
    send_metadata = source_age != client_state->metadata_age;

134 135
    if(send_metadata && strlen(fullmetadata) > 0)
        len_byte = strlen(fullmetadata)/16 + 1 - 
Michael Smith's avatar
Michael Smith committed
136 137 138
            client_state->metadata_offset;
    else
        len_byte = 0;
Michael Smith's avatar
Michael Smith committed
139 140 141 142 143 144 145
    len = 1 + len_byte*16;
    buf = alloca(len);

    memset(buf, 0, len);

    buf[0] = len_byte;

146
    if (len > 1) {
147
        strncpy(buf+1, fullmetadata + client_state->metadata_offset, len-2);
148
    }
Michael Smith's avatar
Michael Smith committed
149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165

    thread_mutex_unlock(&(source_state->lock));

    ret = sock_write_bytes(client->con->sock, buf, len);

    if(ret > 0 && ret < len) {
        client_state->metadata_offset += ret;
    }
    else if(ret == len) {
        client_state->metadata_age = source_age;
        client_state->offset = 0;
        client_state->metadata_offset = 0;
    }

    return ret;
}

Michael Smith's avatar
Michael Smith committed
166 167 168 169
static int format_mp3_write_buf_to_client(format_plugin_t *self, 
    client_t *client, unsigned char *buf, int len) 
{
    int ret;
Michael Smith's avatar
Michael Smith committed
170
    
171 172
    if(((mp3_state *)self->_state)->metadata && 
            ((mp3_client_data *)(client->format_data))->use_metadata)
Michael Smith's avatar
Michael Smith committed
173 174 175
    {
        mp3_client_data *state = client->format_data;
        int max = state->interval - state->offset;
Michael Smith's avatar
Michael Smith committed
176

Michael Smith's avatar
Michael Smith committed
177 178 179 180 181 182 183 184 185 186 187
        if(len == 0) /* Shouldn't happen */
            return 0;

        if(max > len)
            max = len;

        if(max > 0) {
            ret = sock_write_bytes(client->con->sock, buf, max);
            if(ret > 0)
                state->offset += ret;
        }
188
        else {
Michael Smith's avatar
Michael Smith committed
189
            ret = send_metadata(client, state, self->_state);
190 191 192 193
            if(ret > 0)
                client->con->sent_bytes += ret;
            ret = 0;
        }
194

Michael Smith's avatar
Michael Smith committed
195 196 197 198
    }
    else {
        ret = sock_write_bytes(client->con->sock, buf, len);
    }
Michael Smith's avatar
Michael Smith committed
199 200

    if(ret < 0) {
201
        if(sock_recoverable(sock_error())) {
Michael Smith's avatar
Michael Smith committed
202 203 204 205 206 207 208 209 210 211 212
            DEBUG1("Client had recoverable error %ld", ret);
            ret = 0;
        }
    }
    else
        client->con->sent_bytes += ret;

    return ret;
}

static void format_mp3_free_plugin(format_plugin_t *self)
Michael Smith's avatar
Michael Smith committed
213
{
214
    /* free the plugin instance */
Michael Smith's avatar
Michael Smith committed
215 216
    mp3_state *state = self->_state;
    thread_mutex_destroy(&(state->lock));
Michael Smith's avatar
Michael Smith committed
217 218

    free(state->metadata);
Michael Smith's avatar
Michael Smith committed
219
    free(state);
220
    free(self);
Michael Smith's avatar
Michael Smith committed
221 222
}

Michael Smith's avatar
Michael Smith committed
223 224
static int format_mp3_get_buffer(format_plugin_t *self, char *data, 
    unsigned long len, refbuf_t **buffer)
Michael Smith's avatar
Michael Smith committed
225
{
226
    refbuf_t *refbuf;
227 228
    mp3_state *state = self->_state;

229 230 231 232
    /* Set this to NULL in case it doesn't get set to a valid buffer later */
    *buffer = NULL;

    if(!data)
Michael Smith's avatar
Michael Smith committed
233
        return 0;
234

235
    if(state->inline_metadata_interval) {
236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271
        /* Source is sending metadata, handle it... */

        while(len > 0) {
            int to_read = state->inline_metadata_interval - state->offset;
            if(to_read > 0) {
                refbuf_t *old_refbuf = *buffer;

                if(to_read > len)
                    to_read = len;

                if(old_refbuf) {
                    refbuf = refbuf_new(to_read + old_refbuf->len);
                    memcpy(refbuf->data, old_refbuf->data, old_refbuf->len);
                    memcpy(refbuf->data+old_refbuf->len, data, to_read);

                    refbuf_release(old_refbuf);
                }
                else {
                    refbuf = refbuf_new(to_read);
                    memcpy(refbuf->data, data, to_read);
                }

                *buffer = refbuf;

                state->offset += to_read;
                data += to_read;
                len -= to_read;
            }
            else if(!state->metadata_length) {
                /* Next up is the metadata byte... */
                unsigned char byte = data[0];
                data++;
                len--;

                /* According to the "spec"... this byte * 16 */
                state->metadata_length = byte * 16;
272

273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297
                if(state->metadata_length) {
                    state->metadata_buffer = 
                        calloc(state->metadata_length + 1, 1);

                    /* Ensure we have a null-terminator even if the source
                     * stream is invalid.
                     */
                    state->metadata_buffer[state->metadata_length] = 0;
                }
                else {
                    state->offset = 0;
                }

                state->metadata_offset = 0;
            }
            else {
                /* Metadata to read! */
                int readable = state->metadata_length - state->metadata_offset;

                if(readable > len)
                    readable = len;

                memcpy(state->metadata_buffer + state->metadata_offset, 
                        data, readable);

298 299
                state->metadata_offset += readable;

300 301 302 303 304 305 306 307 308 309 310 311 312 313 314
                data += readable;
                len -= readable;

                if(state->metadata_offset == state->metadata_length)
                {
                    if(state->metadata_length)
                    {
                        thread_mutex_lock(&(state->lock));
                        free(state->metadata);
                        state->metadata = state->metadata_buffer;
                        state->metadata_buffer = NULL;
                        state->metadata_age++;
                        state->metadata_raw = 1;
                        thread_mutex_unlock(&(state->lock));
                    }
315 316 317

                    state->offset = 0;
                    state->metadata_length = 0;
318 319 320 321 322 323 324 325
                }
            }
        }

        /* Either we got a buffer above (in which case it can be used), or
         * we set *buffer to NULL in the prologue, so the return value is
         * correct anyway...
         */
326 327 328
        return 0;
    }
    else {
329
        /* Simple case - no metadata, just dump data directly to a buffer */
330
        refbuf = refbuf_new(len);
Michael Smith's avatar
Michael Smith committed
331

332
        memcpy(refbuf->data, data, len);
Michael Smith's avatar
Michael Smith committed
333

334
        *buffer = refbuf;
335
        return 0;
336
    }
Michael Smith's avatar
Michael Smith committed
337 338
}

Michael Smith's avatar
Michael Smith committed
339
static refbuf_queue_t *format_mp3_get_predata(format_plugin_t *self)
Michael Smith's avatar
Michael Smith committed
340 341 342 343
{
    return NULL;
}

Michael Smith's avatar
Michael Smith committed
344 345 346 347 348 349 350 351 352
static void *format_mp3_create_client_data(format_plugin_t *self, 
        source_t *source, client_t *client) 
{
    mp3_client_data *data = calloc(1,sizeof(mp3_client_data));
    char *metadata;

    data->interval = ICY_METADATA_INTERVAL;
    data->offset = 0;

353
    metadata = httpp_getvar(client->parser, "icy-metadata");
Michael Smith's avatar
Michael Smith committed
354
    if(metadata)
Michael Smith's avatar
Michael Smith committed
355
        data->use_metadata = atoi(metadata)>0?1:0;
Michael Smith's avatar
Michael Smith committed
356 357

    return data;
358
}
Michael Smith's avatar
Michael Smith committed
359

Michael Smith's avatar
Michael Smith committed
360 361 362
static void format_mp3_send_headers(format_plugin_t *self,
        source_t *source, client_t *client)
{
363 364
    http_var_t *var;
    avl_node *node;
Michael Smith's avatar
Michael Smith committed
365 366 367
    int bytes;
    
    client->respcode = 200;
Michael Smith's avatar
Michael Smith committed
368
    /* TODO: This may need to be ICY/1.0 for shoutcast-compatibility? */
Michael Smith's avatar
Michael Smith committed
369 370 371 372 373 374 375
    bytes = sock_write(client->con->sock, 
            "HTTP/1.0 200 OK\r\n" 
            "Content-Type: %s\r\n", 
            format_get_mimetype(source->format->type));

    if(bytes > 0) client->con->sent_bytes += bytes;

376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403
    /* iterate through source http headers and send to client */
    avl_tree_rlock(source->parser->vars);
    node = avl_get_first(source->parser->vars);
    while (node) {
        var = (http_var_t *)node->key;
	if (!strcasecmp(var->name, "ice-audio-info")) {
	    /* convert ice-audio-info to icy-br */
	    char *brfield;
	    unsigned int bitrate;

	    brfield = strstr(var->value, "bitrate=");
	    if (brfield && sscanf(var->value, "bitrate=%u", &bitrate)) {
		bytes = sock_write(client->con->sock, "icy-br:%u\r\n", bitrate);
		if (bytes > 0)
		    client->con->sent_bytes += bytes;
	    }
	} else if (strcasecmp(var->name, "ice-password") &&
	    strcasecmp(var->name, "icy-metaint") &&
	    (!strncasecmp("ice-", var->name, 4) ||
	     !strncasecmp("icy-", var->name, 4))) {
	    bytes = sock_write(client->con->sock, "icy%s:%s\r\n",
			       var->name + 3, var->value);
            if (bytes > 0)
		client->con->sent_bytes += bytes;
        }
        node = avl_get_next(node);
    }
    avl_tree_unlock(source->parser->vars);
Michael Smith's avatar
Michael Smith committed
404

Michael Smith's avatar
Michael Smith committed
405
    if(((mp3_client_data *)(client->format_data))->use_metadata) {
406
        int bytes = sock_write(client->con->sock, "icy-metaint:%d\r\n", 
Michael Smith's avatar
Michael Smith committed
407 408 409 410
                ICY_METADATA_INTERVAL);
        if(bytes > 0)
            client->con->sent_bytes += bytes;
    }
411 412 413 414 415

    bytes = sock_write(client->con->sock,
		       "Server: %s\r\n", ICECAST_VERSION_STRING);
    if (bytes > 0)
	client->con->sent_bytes += bytes;
Michael Smith's avatar
Michael Smith committed
416 417
}