| 1 | /* |
| 2 | * This file is part of DisOrder |
| 3 | * Copyright (C) 2007-2011 Richard Kettlewell |
| 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 | */ |
| 18 | /** @file server/decode-ogg.c |
| 19 | * @brief General-purpose decoder for use by speaker process |
| 20 | */ |
| 21 | #include "decode.h" |
| 22 | |
| 23 | #include <vorbis/vorbisfile.h> |
| 24 | |
| 25 | static size_t ogg_read_func(void *ptr, size_t size, size_t nmemb, void *datasource) { |
| 26 | struct hreader *h = datasource; |
| 27 | |
| 28 | int n = hreader_read(h, ptr, size * nmemb); |
| 29 | if(n < 0) n = 0; |
| 30 | return n / size; |
| 31 | } |
| 32 | |
| 33 | static int ogg_seek_func(void *datasource, ogg_int64_t offset, int whence) { |
| 34 | struct hreader *h = datasource; |
| 35 | |
| 36 | return hreader_seek(h, offset, whence) < 0 ? -1 : 0; |
| 37 | } |
| 38 | |
| 39 | static int ogg_close_func(void attribute((unused)) *datasource) { |
| 40 | return 0; |
| 41 | } |
| 42 | |
| 43 | static long ogg_tell_func(void *datasource) { |
| 44 | struct hreader *h = datasource; |
| 45 | |
| 46 | return hreader_seek(h, 0, SEEK_CUR); |
| 47 | } |
| 48 | |
| 49 | static const ov_callbacks ogg_callbacks = { |
| 50 | ogg_read_func, |
| 51 | ogg_seek_func, |
| 52 | ogg_close_func, |
| 53 | ogg_tell_func, |
| 54 | }; |
| 55 | |
| 56 | /** @brief OGG decoder */ |
| 57 | void decode_ogg(void) { |
| 58 | struct hreader ogginput[1]; |
| 59 | OggVorbis_File vf[1]; |
| 60 | int err; |
| 61 | long n; |
| 62 | int bitstream; |
| 63 | vorbis_info *vi; |
| 64 | |
| 65 | hreader_init(path, ogginput); |
| 66 | /* There doesn't seem to be any standard function for mapping the error codes |
| 67 | * to strings l-( */ |
| 68 | if((err = ov_open_callbacks(ogginput, vf, 0/*initial*/, 0/*ibytes*/, |
| 69 | ogg_callbacks))) |
| 70 | disorder_fatal(0, "ov_open_callbacks %s: %d", path, err); |
| 71 | if(!(vi = ov_info(vf, 0/*link*/))) |
| 72 | disorder_fatal(0, "ov_info %s: failed", path); |
| 73 | while((n = ov_read(vf, input_buffer, sizeof input_buffer, 1/*bigendianp*/, |
| 74 | 2/*bytes/word*/, 1/*signed*/, &bitstream))) { |
| 75 | if(n < 0) |
| 76 | disorder_fatal(0, "ov_read %s: %ld", path, n); |
| 77 | if(bitstream > 0) |
| 78 | disorder_fatal(0, "only single-bitstream ogg files are supported"); |
| 79 | output_header(vi->rate, vi->channels, 16/*bits*/, n, ENDIAN_BIG); |
| 80 | if(fwrite(input_buffer, 1, n, outputfp) < (size_t)n) |
| 81 | disorder_fatal(errno, "decoding %s: writing sample data", path); |
| 82 | } |
| 83 | } |
| 84 | |
| 85 | /* |
| 86 | Local Variables: |
| 87 | c-basic-offset:2 |
| 88 | comment-column:40 |
| 89 | fill-column:79 |
| 90 | indent-tabs-mode:nil |
| 91 | End: |
| 92 | */ |