2 * Copyright (c) 2022 Omar Polo <op@openbsd.org>
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.
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.
19 #include <sys/types.h>
20 #include <sys/queue.h>
37 struct mad_stream mad_stream;
38 struct mad_frame mad_frame;
39 struct mad_synth mad_synth;
48 input(void *d, struct mad_stream *stream)
50 struct buffer *buffer = d;
52 if (buffer->length == 0)
55 printf("decode time! start=%p, len=%zu\n", buffer->start, buffer->length);
56 mad_stream_buffer(stream, buffer->start, buffer->length);
58 buffer->sample_rate = 0;
59 return MAD_FLOW_CONTINUE;
62 /* scale a mad sample to 16 bits */
64 scale(mad_fixed_t sample)
67 sample += (1L << (MAD_F_FRACBITS - 16));
70 if (sample >= MAD_F_ONE)
71 sample = MAD_F_ONE - 1;
72 else if (sample < -MAD_F_ONE)
76 return sample >> (MAD_F_FRACBITS + 1 - 16);
80 output(void *data, const struct mad_header *header, struct mad_pcm *pcm)
82 static uint8_t buf[BUFSIZ];
84 struct buffer *buffer = data;
87 const mad_fixed_t *leftch, *rightch;
89 if (player_shouldstop())
92 nsamples = pcm->length;
93 leftch = pcm->samples[0];
94 rightch = pcm->samples[1];
96 if (buffer->sample_rate != pcm->samplerate) {
97 buffer->sample_rate = pcm->samplerate;
98 if (player_setrate(pcm->samplerate) == -1)
99 err(1, "player_setrate");
102 if (pcm->channels != 2) {
103 printf("mono not supported!\n");
104 return MAD_FLOW_STOP;
107 for (i = 0, len = 0; i < nsamples; ++i) {
108 if (len+4 >= sizeof(buf)) {
109 sio_write(hdl, buf, len);
110 /* fwrite(buf, 1, len, stdout); */
114 sample = scale(*leftch++);
115 buf[len++] = sample & 0xff;
116 buf[len++] = (sample >> 8) & 0xff;
118 sample = scale(*rightch++);
119 buf[len++] = sample & 0xff;
120 buf[len++] = (sample >> 8) & 0xff;
124 /* fwrite(buf, 1, len, stdout); */
125 sio_write(hdl, buf, len);
127 return MAD_FLOW_CONTINUE;
131 error(void *d, struct mad_stream *stream, struct mad_frame *frame)
133 struct buffer *buffer = d;
135 warnx("decoding error 0x%04x (%s) at byte offset %zu",
136 stream->error, mad_stream_errorstr(stream),
137 stream->this_frame - (const unsigned char *)buffer->start);
139 return MAD_FLOW_CONTINUE;
143 decode(void *m, size_t len)
145 struct buffer buffer;
146 struct mad_decoder decoder;
149 /* initialize our private message structure; */
153 /* configure input, output and error functions */
154 mad_decoder_init(&decoder, &buffer, input, 0 /* header */,
155 0 /* filter */, output, error, 0 /* message */);
158 result = mad_decoder_run(&decoder, MAD_DECODER_MODE_SYNC);
160 /* release the decoder */
161 mad_decoder_finish(&decoder);
172 if (fstat(fd, &stat) == -1)
174 warnx("file size %lld", stat.st_size);
176 m = mmap(NULL, stat.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
180 decode(m, stat.st_size);
181 munmap(m, stat.st_size);