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 <sndio.h>
26 #include <stdio.h>
27 #include <stdlib.h>
28 #include <stdint.h>
29 #include <imsg.h>
30 
31 #include <FLAC/stream_decoder.h>
32 
33 #include "amused.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 	if (player_shouldstop())
44 		return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
45 
46 	for (i = 0, len = 0; i < frame->header.blocksize; ++i) {
47 		if (len+4 >= sizeof(buf)) {
48 			sio_write(hdl, buf, len);
49 			len = 0;
50 		}
51 
52 		buf[len++] = buffer[0][i] & 0xff;
53 		buf[len++] = (buffer[0][i] >> 8) & 0xff;
54 
55 		buf[len++] = buffer[1][i] & 0xff;
56 		buf[len++] = (buffer[1][i] >> 8) & 0xff;
57 	}
58 
59 	if (len != 0)
60 		sio_write(hdl, buf, len);
61 
62 	return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
63 }
64 
65 static void
66 metacb(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *meta,
67     void *d)
68 {
69 	uint32_t sample_rate;
70 	int channels;
71 
72 	if (meta->type == FLAC__METADATA_TYPE_STREAMINFO) {
73 		sample_rate = meta->data.stream_info.sample_rate;
74 		channels = meta->data.stream_info.channels;
75 
76 		printf("sample rate: %d\n", sample_rate);
77 		printf("channels: %d\n", meta->data.stream_info.channels);
78 		printf("bps: %d\n", meta->data.stream_info.bits_per_sample);
79 		printf("total samples: %"PRIu64"\n", meta->data.stream_info.total_samples);
80 
81 		if (player_setup(sample_rate, channels) == -1)
82 			err(1, "player_setrate");
83 	}
84 }
85 
86 static void
87 errcb(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status,
88     void *data)
89 {
90 	warnx("error: %s", FLAC__StreamDecoderErrorStatusString[status]);
91 }
92 
93 void
94 play_flac(int fd)
95 {
96 	FILE *f;
97 	int ok = 1;
98 	FLAC__StreamDecoder *decoder = NULL;
99 	FLAC__StreamDecoderInitStatus init_status;
100 
101 	if ((f = fdopen(fd, "r")) == NULL)
102 		err(1, "fdopen");
103 
104 	decoder = FLAC__stream_decoder_new();
105 	if (decoder == NULL)
106 		err(1, "flac stream decoder");
107 
108 	FLAC__stream_decoder_set_md5_checking(decoder, 1);
109 
110 	init_status = FLAC__stream_decoder_init_FILE(decoder, f, writecb,
111 	    metacb, errcb, NULL);
112 	if (init_status != FLAC__STREAM_DECODER_INIT_STATUS_OK)
113 		errx(1, "flac decoder: %s",
114 		    FLAC__StreamDecoderInitStatusString[init_status]);
115 
116 	ok = FLAC__stream_decoder_process_until_end_of_stream(decoder);
117 	warnx("decoding %s", ok ? "succeeded" : "failed");
118 	warnx("state: %s",
119 	    FLAC__StreamDecoderStateString[FLAC__stream_decoder_get_state(decoder)]);
120 
121 	FLAC__stream_decoder_delete(decoder);
122 }