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>
36 struct mad_stream mad_stream;
37 struct mad_frame mad_frame;
38 struct mad_synth mad_synth;
47 input(void *d, struct mad_stream *stream)
49 struct buffer *buffer = d;
51 if (buffer->length == 0)
54 printf("decode time! start=%p, len=%zu\n", buffer->start, buffer->length);
55 mad_stream_buffer(stream, buffer->start, buffer->length);
57 buffer->sample_rate = 0;
58 return MAD_FLOW_CONTINUE;
61 /* scale a mad sample to 16 bits */
63 scale(mad_fixed_t sample)
66 sample += (1L << (MAD_F_FRACBITS - 16));
69 if (sample >= MAD_F_ONE)
70 sample = MAD_F_ONE - 1;
71 else if (sample < -MAD_F_ONE)
75 return sample >> (MAD_F_FRACBITS + 1 - 16);
79 output(void *data, const struct mad_header *header, struct mad_pcm *pcm)
81 static uint8_t buf[BUFSIZ];
83 struct buffer *buffer = data;
86 const mad_fixed_t *leftch, *rightch;
88 if (player_shouldstop())
91 nsamples = pcm->length;
92 leftch = pcm->samples[0];
93 rightch = pcm->samples[1];
95 if (buffer->sample_rate != pcm->samplerate) {
96 buffer->sample_rate = pcm->samplerate;
97 if (player_setrate(pcm->samplerate) == -1)
98 err(1, "player_setrate");
101 if (pcm->channels != 2) {
102 printf("mono not supported!\n");
103 return MAD_FLOW_STOP;
106 for (i = 0, len = 0; i < nsamples; ++i) {
107 if (len+4 >= sizeof(buf)) {
108 sio_write(hdl, buf, len);
109 /* fwrite(buf, 1, len, stdout); */
113 sample = scale(*leftch++);
114 buf[len++] = sample & 0xff;
115 buf[len++] = (sample >> 8) & 0xff;
117 sample = scale(*rightch++);
118 buf[len++] = sample & 0xff;
119 buf[len++] = (sample >> 8) & 0xff;
123 /* fwrite(buf, 1, len, stdout); */
124 sio_write(hdl, buf, len);
126 return MAD_FLOW_CONTINUE;
130 error(void *d, struct mad_stream *stream, struct mad_frame *frame)
132 struct buffer *buffer = d;
134 warnx("decoding error 0x%04x (%s) at byte offset %zu",
135 stream->error, mad_stream_errorstr(stream),
136 stream->this_frame - (const unsigned char *)buffer->start);
138 return MAD_FLOW_CONTINUE;
142 decode(void *m, size_t len)
144 struct buffer buffer;
145 struct mad_decoder decoder;
148 /* initialize our private message structure; */
152 /* configure input, output and error functions */
153 mad_decoder_init(&decoder, &buffer, input, 0 /* header */,
154 0 /* filter */, output, error, 0 /* message */);
157 result = mad_decoder_run(&decoder, MAD_DECODER_MODE_SYNC);
159 /* release the decoder */
160 mad_decoder_finish(&decoder);
171 if (fstat(fd, &stat) == -1)
173 warnx("file size %lld", stat.st_size);
175 m = mmap(NULL, stat.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
179 decode(m, stat.st_size);
180 munmap(m, stat.st_size);