format_mp3.c 5.75 KB
Newer Older
Michael Smith's avatar
Michael Smith committed
1
2
/* format_mp3.c
**
Michael Smith's avatar
Michael Smith committed
3
** format plugin for mp3
Michael Smith's avatar
Michael Smith committed
4
5
6
7
8
9
10
11
**
*/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "refbuf.h"
Michael Smith's avatar
Michael Smith committed
12
13
#include "source.h"
#include "client.h"
Michael Smith's avatar
Michael Smith committed
14
15
16

#include "stats.h"
#include "format.h"
Michael Smith's avatar
Michael Smith committed
17
18
19
20
21
22
23
24
25
26
#include "httpp/httpp.h"

#include "log.h"
#include "logging.h"

#include "format_mp3.h"

#define CATMODULE "format-mp3"

#define ICY_METADATA_INTERVAL 16000
Michael Smith's avatar
Michael Smith committed
27

28
29
30
31
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
32
33
34
35
36
37
38
39
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
40
   int use_metadata;
Michael Smith's avatar
Michael Smith committed
41
42
   int interval;
   int offset;
Michael Smith's avatar
Michael Smith committed
43
44
   int metadata_age;
   int metadata_offset;
Michael Smith's avatar
Michael Smith committed
45
} mp3_client_data;
Michael Smith's avatar
Michael Smith committed
46
47
48
49

format_plugin_t *format_mp3_get_plugin(void)
{
	format_plugin_t *plugin;
Michael Smith's avatar
Michael Smith committed
50
    mp3_state *state = calloc(1, sizeof(mp3_state));
Michael Smith's avatar
Michael Smith committed
51
52
53
54
55
56
57

	plugin = (format_plugin_t *)malloc(sizeof(format_plugin_t));

	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
58
    plugin->write_buf_to_client = format_mp3_write_buf_to_client;
59
    plugin->create_client_data = format_mp3_create_client_data;
Michael Smith's avatar
Michael Smith committed
60
    plugin->client_send_headers = format_mp3_send_headers;
Michael Smith's avatar
Michael Smith committed
61
	plugin->free_plugin = format_mp3_free_plugin;
62
    plugin->format_description = "MP3 audio";
Michael Smith's avatar
Michael Smith committed
63

Michael Smith's avatar
Michael Smith committed
64
65
	plugin->_state = state;

Michael Smith's avatar
Michael Smith committed
66
67
    state->metadata_age = 0;
    state->metadata = strdup("");
Michael Smith's avatar
Michael Smith committed
68
    thread_mutex_create(&(state->lock));
Michael Smith's avatar
Michael Smith committed
69
70
71
72

	return plugin;
}

Michael Smith's avatar
Michael Smith committed
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
/* TODO: need locking around source_state->metadata!! */

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;

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

    source_age = source_state->metadata_age;
Michael Smith's avatar
Michael Smith committed
93
94
95
96
97
98
99
    send_metadata = source_age != client_state->metadata_age;

    if(send_metadata && strlen(source_state->metadata) > 0)
        len_byte = strlen(source_state->metadata)/16 + 1 - 
            client_state->metadata_offset;
    else
        len_byte = 0;
Michael Smith's avatar
Michael Smith committed
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
    len = 1 + len_byte*16;
    buf = alloca(len);

    memset(buf, 0, len);

    buf[0] = len_byte;

    strncpy(buf+1, source_state->metadata + client_state->metadata_offset, 
            len-2);

    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
126
127
128
129
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
130
131
132
133
134
    
    if(((mp3_state *)self->_state)->metadata) 
    {
        mp3_client_data *state = client->format_data;
        int max = state->interval - state->offset;
Michael Smith's avatar
Michael Smith committed
135

Michael Smith's avatar
Michael Smith committed
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
        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;
        }
        else
            ret = send_metadata(client, state, self->_state);
    }
    else {
        ret = sock_write_bytes(client->con->sock, buf, len);
    }
Michael Smith's avatar
Michael Smith committed
153
154
155
156
157
158
159
160
161
162
163
164
165
166

    if(ret < 0) {
        if(sock_recoverable(ret)) {
            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
167
168
{
	/* free the plugin instance */
Michael Smith's avatar
Michael Smith committed
169
170
    mp3_state *state = self->_state;
    thread_mutex_destroy(&(state->lock));
Michael Smith's avatar
Michael Smith committed
171
172

    free(state->metadata);
Michael Smith's avatar
Michael Smith committed
173
    free(state);
Michael Smith's avatar
Michael Smith committed
174
175
176
	free(self);
}

Michael Smith's avatar
Michael Smith committed
177
178
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
179
180
181
182
183
184
185
186
187
188
189
190
191
192
{
	refbuf_t *refbuf;
    if(!data) {
        *buffer = NULL;
        return 0;
    }
    refbuf = refbuf_new(len);

    memcpy(refbuf->data, data, len);

    *buffer = refbuf;
	return 0;
}

Michael Smith's avatar
Michael Smith committed
193
static refbuf_queue_t *format_mp3_get_predata(format_plugin_t *self)
Michael Smith's avatar
Michael Smith committed
194
195
196
197
{
    return NULL;
}

Michael Smith's avatar
Michael Smith committed
198
199
200
201
202
203
204
205
206
207
208
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;

    metadata = httpp_getvar(source->parser, "icy-metadata");
    if(metadata)
Michael Smith's avatar
Michael Smith committed
209
        data->use_metadata = atoi(metadata)>0?1:0;
Michael Smith's avatar
Michael Smith committed
210
211

    return data;
212
}
Michael Smith's avatar
Michael Smith committed
213

Michael Smith's avatar
Michael Smith committed
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
static void format_mp3_send_headers(format_plugin_t *self,
        source_t *source, client_t *client)
{
    int bytes;
    
    client->respcode = 200;
    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;

    format_send_general_headers(self, source, client);

Michael Smith's avatar
Michael Smith committed
229
    if(((mp3_client_data *)(client->format_data))->use_metadata) {
Michael Smith's avatar
Michael Smith committed
230
231
232
233
234
235
236
237
238
        int bytes = sock_write(client->con->sock, "icy-metaint: %d\r\n", 
                ICY_METADATA_INTERVAL);
        if(bytes > 0)
            client->con->sent_bytes += bytes;
    }
}



Michael Smith's avatar
Michael Smith committed
239