1 /*
2  * Copyright (c) 2022 Omar Polo <op@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include <sys/types.h>
18 #include <sys/queue.h>
19 #include <sys/uio.h>
20 
21 #include <err.h>
22 #include <event.h>
23 #include <inttypes.h>
24 #include <limits.h>
25 #include <stdio.h>
26 #include <stdlib.h>
27 #include <stdint.h>
28 #include <imsg.h>
29 
30 #include <FLAC/stream_decoder.h>
31 
32 #include "amused.h"
33 #include "log.h"
34 
35 static FLAC__StreamDecoderWriteStatus
36 writecb(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame,
37     const int32_t * const *buffer, void *data)
38 {
39 	static uint8_t buf[BUFSIZ];
40 	int i;
41 	size_t len;
42 
43 	for (i = 0, len = 0; i < frame->header.blocksize; ++i) {
44 		if (len+4 >= sizeof(buf)) {
45 			if (!play(buf, len))
46 				goto quit;
47 		}
48 
49 		buf[len++] = buffer[0][i] & 0xff;
50 		buf[len++] = (buffer[0][i] >> 8) & 0xff;
51 
52 		buf[len++] = buffer[1][i] & 0xff;
53 		buf[len++] = (buffer[1][i] >> 8) & 0xff;
54 	}
55 
56 	if (len != 0 && !play(buf, len))
57 		goto quit;
58 
59 	return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
60 quit:
61 	return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
62 }
63 
64 static void
65 metacb(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *meta,
66     void *d)
67 {
68 	uint32_t sample_rate;
69 	int channels;
70 
71 	if (meta->type == FLAC__METADATA_TYPE_STREAMINFO) {
72 		sample_rate = meta->data.stream_info.sample_rate;
73 		channels = meta->data.stream_info.channels;
74 
75 		if (player_setup(16, sample_rate, channels) == -1)
76 			err(1, "player_setrate");
77 	}
78 }
79 
80 static void
81 errcb(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status,
82     void *data)
83 {
84 	log_warnx("flac error: %s", FLAC__StreamDecoderErrorStatusString[status]);
85 }
86 
87 int
88 play_flac(int fd)
89 {
90 	FILE *f;
91 	int s, ok = 1;
92 	const char *state;
93 	FLAC__StreamDecoder *decoder = NULL;
94 	FLAC__StreamDecoderInitStatus init_status;
95 
96 	if ((f = fdopen(fd, "r")) == NULL)
97 		err(1, "fdopen");
98 
99 	decoder = FLAC__stream_decoder_new();
100 	if (decoder == NULL)
101 		err(1, "flac stream decoder");
102 
103 	FLAC__stream_decoder_set_md5_checking(decoder, 1);
104 
105 	init_status = FLAC__stream_decoder_init_FILE(decoder, f, writecb,
106 	    metacb, errcb, NULL);
107 	if (init_status != FLAC__STREAM_DECODER_INIT_STATUS_OK)
108 		errx(1, "flac decoder: %s",
109 		    FLAC__StreamDecoderInitStatusString[init_status]);
110 
111 	ok = FLAC__stream_decoder_process_until_end_of_stream(decoder);
112 	s = FLAC__stream_decoder_get_state(decoder);
113 
114 	FLAC__stream_decoder_delete(decoder);
115 	fclose(f);
116 
117 	if (!ok && s != FLAC__STREAM_DECODER_ABORTED) {
118 		state = FLAC__StreamDecoderStateString[s];
119 		log_warnx("decoding failed; state: %s", state);
120 		return 1;
121 	}
122 	if (!ok)
123 		return -1;
124 	return 0;
125 }