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8d399b30 RK |
1 | /* |
2 | * This file is part of DisOrder | |
8a886602 | 3 | * Copyright (C) 2007-2011 Richard Kettlewell |
8d399b30 RK |
4 | * |
5 | * This program is free software: you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation, either version 3 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
17 | */ | |
1a164e63 | 18 | /** @file server/decode-flac.c |
8d399b30 RK |
19 | * @brief General-purpose decoder for use by speaker process |
20 | */ | |
21 | #include "decode.h" | |
22 | #include <FLAC/stream_decoder.h> | |
23 | ||
24 | /** @brief Metadata callback for FLAC decoder | |
25 | * | |
26 | * This is a no-op here. | |
27 | */ | |
28 | static void flac_metadata(const FLAC__StreamDecoder attribute((unused)) *decoder, | |
29 | const FLAC__StreamMetadata attribute((unused)) *metadata, | |
30 | void attribute((unused)) *client_data) { | |
31 | } | |
32 | ||
33 | /** @brief Error callback for FLAC decoder */ | |
34 | static void flac_error(const FLAC__StreamDecoder attribute((unused)) *decoder, | |
35 | FLAC__StreamDecoderErrorStatus status, | |
36 | void attribute((unused)) *client_data) { | |
37 | disorder_fatal(0, "error decoding %s: %s", path, | |
38 | FLAC__StreamDecoderErrorStatusString[status]); | |
39 | } | |
40 | ||
41 | /** @brief Write callback for FLAC decoder */ | |
42 | static FLAC__StreamDecoderWriteStatus flac_write | |
43 | (const FLAC__StreamDecoder attribute((unused)) *decoder, | |
44 | const FLAC__Frame *frame, | |
45 | const FLAC__int32 *const buffer[], | |
46 | void attribute((unused)) *client_data) { | |
47 | size_t n, c; | |
48 | ||
49 | output_header(frame->header.sample_rate, | |
50 | frame->header.channels, | |
51 | frame->header.bits_per_sample, | |
52 | (frame->header.channels * frame->header.blocksize | |
53 | * frame->header.bits_per_sample) / 8, | |
54 | ENDIAN_BIG); | |
55 | for(n = 0; n < frame->header.blocksize; ++n) { | |
56 | for(c = 0; c < frame->header.channels; ++c) { | |
57 | switch(frame->header.bits_per_sample) { | |
58 | case 8: output_8(buffer[c][n]); break; | |
59 | case 16: output_16(buffer[c][n]); break; | |
60 | case 24: output_24(buffer[c][n]); break; | |
61 | case 32: output_32(buffer[c][n]); break; | |
62 | } | |
63 | } | |
64 | } | |
65 | return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE; | |
66 | } | |
67 | ||
68 | static FLAC__StreamDecoderReadStatus flac_read(const FLAC__StreamDecoder attribute((unused)) *decoder, | |
69 | FLAC__byte buffer[], | |
70 | size_t *bytes, | |
71 | void *client_data) { | |
72 | struct hreader *flacinput = client_data; | |
73 | int n = hreader_read(flacinput, buffer, *bytes); | |
74 | if(n == 0) { | |
75 | *bytes = 0; | |
76 | return FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM; | |
77 | } | |
78 | if(n < 0) { | |
79 | *bytes = 0; | |
80 | return FLAC__STREAM_DECODER_READ_STATUS_ABORT; | |
81 | } | |
82 | *bytes = n; | |
83 | return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE; | |
84 | } | |
85 | ||
86 | static FLAC__StreamDecoderSeekStatus flac_seek(const FLAC__StreamDecoder attribute((unused)) *decoder, | |
87 | FLAC__uint64 absolute_byte_offset, | |
88 | void *client_data) { | |
89 | struct hreader *flacinput = client_data; | |
90 | if(hreader_seek(flacinput, absolute_byte_offset, SEEK_SET) < 0) | |
91 | return FLAC__STREAM_DECODER_SEEK_STATUS_ERROR; | |
92 | else | |
93 | return FLAC__STREAM_DECODER_SEEK_STATUS_OK; | |
94 | } | |
95 | ||
96 | static FLAC__StreamDecoderTellStatus flac_tell(const FLAC__StreamDecoder attribute((unused)) *decoder, | |
97 | FLAC__uint64 *absolute_byte_offset, | |
98 | void *client_data) { | |
99 | struct hreader *flacinput = client_data; | |
100 | off_t offset = hreader_seek(flacinput, 0, SEEK_CUR); | |
101 | if(offset < 0) | |
102 | return FLAC__STREAM_DECODER_TELL_STATUS_ERROR; | |
103 | *absolute_byte_offset = offset; | |
104 | return FLAC__STREAM_DECODER_TELL_STATUS_OK; | |
105 | } | |
106 | ||
107 | static FLAC__StreamDecoderLengthStatus flac_length(const FLAC__StreamDecoder attribute((unused)) *decoder, | |
108 | FLAC__uint64 *stream_length, | |
109 | void *client_data) { | |
110 | struct hreader *flacinput = client_data; | |
111 | *stream_length = hreader_size(flacinput); | |
112 | return FLAC__STREAM_DECODER_LENGTH_STATUS_OK; | |
113 | } | |
114 | ||
115 | static FLAC__bool flac_eof(const FLAC__StreamDecoder attribute((unused)) *decoder, | |
116 | void *client_data) { | |
117 | struct hreader *flacinput = client_data; | |
118 | return hreader_eof(flacinput); | |
119 | } | |
120 | ||
121 | /** @brief FLAC file decoder */ | |
122 | void decode_flac(void) { | |
123 | FLAC__StreamDecoder *sd = FLAC__stream_decoder_new(); | |
124 | FLAC__StreamDecoderInitStatus is; | |
125 | struct hreader flacinput[1]; | |
126 | ||
127 | if (!sd) | |
128 | disorder_fatal(0, "FLAC__stream_decoder_new failed"); | |
129 | if(hreader_init(path, flacinput)) | |
130 | disorder_fatal(errno, "error opening %s", path); | |
131 | ||
132 | if((is = FLAC__stream_decoder_init_stream(sd, | |
133 | flac_read, | |
134 | flac_seek, | |
135 | flac_tell, | |
136 | flac_length, | |
137 | flac_eof, | |
138 | flac_write, flac_metadata, | |
139 | flac_error, | |
140 | flacinput))) | |
141 | disorder_fatal(0, "FLAC__stream_decoder_init_stream %s: %s", | |
142 | path, FLAC__StreamDecoderInitStatusString[is]); | |
143 | ||
144 | FLAC__stream_decoder_process_until_end_of_stream(sd); | |
145 | FLAC__stream_decoder_finish(sd); | |
146 | FLAC__stream_decoder_delete(sd); | |
147 | } | |
148 | ||
149 | /* | |
150 | Local Variables: | |
151 | c-basic-offset:2 | |
152 | comment-column:40 | |
153 | fill-column:79 | |
154 | indent-tabs-mode:nil | |
155 | End: | |
156 | */ |