aboutsummaryrefslogtreecommitdiffstats
path: root/src/output/shout_mp3.c
blob: 86d39fc666adebf8f55ff08e4bc7733655e13387 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
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
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
/* the Music Player Daemon (MPD)
 * Copyright (C) 2003-2007 by Warren Dukes (warren.dukes@gmail.com)
 * This project's homepage is: http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include "shout_plugin.h"

#include <lame/lame.h>

#include <assert.h>
#include <stdlib.h>

struct lame_data {
	lame_global_flags *gfp;
};


static int shout_mp3_encoder_init(struct shout_data *sd)
{
	struct lame_data *ld = g_new(struct lame_data, 1);

	sd->encoder_data = ld;

	return 0;
}

static int shout_mp3_encoder_clear_encoder(struct shout_data *sd)
{
	struct lame_data *ld = (struct lame_data *)sd->encoder_data;
	struct shout_buffer *buf = &sd->buf;
	int ret;

	if ((ret = lame_encode_flush(ld->gfp, buf->data + buf->len,
				     buf->len)) < 0)
		g_warning("error flushing lame buffers\n");

	lame_close(ld->gfp);
	ld->gfp = NULL;

	return (ret > 0);
}

static void shout_mp3_encoder_finish(struct shout_data *sd)
{
	struct lame_data *ld = (struct lame_data *)sd->encoder_data;

	assert(ld->gfp == NULL);

	g_free(ld);
}

static int shout_mp3_encoder_init_encoder(struct shout_data *sd)
{
	struct lame_data *ld = (struct lame_data *)sd->encoder_data;

	if (NULL == (ld->gfp = lame_init())) {
		g_warning("error initializing lame encoder for shout\n");
		return -1;
	}

	if (sd->quality >= -1.0) {
		if (0 != lame_set_VBR(ld->gfp, vbr_rh)) {
			g_warning("error setting lame VBR mode\n");
			return -1;
		}
		if (0 != lame_set_VBR_q(ld->gfp, sd->quality)) {
			g_warning("error setting lame VBR quality\n");
			return -1;
		}
	} else {
		if (0 != lame_set_brate(ld->gfp, sd->bitrate)) {
			g_warning("error setting lame bitrate\n");
			return -1;
		}
	}

	if (0 != lame_set_num_channels(ld->gfp,
				       sd->audio_format.channels)) {
		g_warning("error setting lame num channels\n");
		return -1;
	}

	if (0 != lame_set_in_samplerate(ld->gfp,
					sd->audio_format.sample_rate)) {
		g_warning("error setting lame sample rate\n");
		return -1;
	}

	if (0 > lame_init_params(ld->gfp))
		g_error("error initializing lame params\n");

	return 0;
}

static int shout_mp3_encoder_send_metadata(struct shout_data *sd,
					   char * song, size_t size)
{
	char artist[size];
	char title[size];
	int i;
	const struct tag *tag = sd->tag;

	strncpy(artist, "", size);
	strncpy(title, "", size);

	for (i = 0; i < tag->numOfItems; i++) {
		switch (tag->items[i]->type) {
		case TAG_ITEM_ARTIST:
			strncpy(artist, tag->items[i]->value, size);
			break;
		case TAG_ITEM_TITLE:
			strncpy(title, tag->items[i]->value, size);
			break;

		default:
			break;
		}
	}
	snprintf(song, size, "%s - %s", title, artist);

	return 1;
}

static int shout_mp3_encoder_encode(struct shout_data *sd,
				    const char * chunk, size_t len)
{
	const int16_t *src = (const int16_t*)chunk;
	unsigned int i;
	float *left, *right;
	struct shout_buffer *buf = &(sd->buf);
	unsigned int samples;
	int bytes = audio_format_sample_size(&sd->audio_format);
	struct lame_data *ld = (struct lame_data *)sd->encoder_data;
	int bytes_out;

	samples = len / (bytes * sd->audio_format.channels);
	left = g_malloc(sizeof(left[0]) * samples);
	if (sd->audio_format.channels > 1)
		right = g_malloc(sizeof(left[0]) * samples);
	else
		right = left;

	/* this is for only 16-bit audio */

	for (i = 0; i < samples; i++) {
		left[i] = src[0];
		if (right != left)
			right[i] = src[1];
		src += sd->audio_format.channels;
	}

	bytes_out = lame_encode_buffer_float(ld->gfp, left, right,
					     samples, buf->data,
					     sizeof(buf->data) - buf->len);

	g_free(left);
	if (right != left)
		g_free(right);

	if (0 > bytes_out) {
		g_warning("error encoding lame buffer for shout\n");
		lame_close(ld->gfp);
		ld->gfp = NULL;
		return -1;
	} else
		buf->len = bytes_out; /* signed to unsigned conversion */

	return 0;
}

const struct shout_encoder_plugin shout_mp3_encoder = {
	"mp3",
	SHOUT_FORMAT_MP3,

	shout_mp3_encoder_clear_encoder,
	shout_mp3_encoder_encode,
	shout_mp3_encoder_finish,
	shout_mp3_encoder_init,
	shout_mp3_encoder_init_encoder,
	shout_mp3_encoder_send_metadata,
};