| 1 | /* |
| 2 | * This file is part of DisOrder |
| 3 | * Copyright (C) 2007-2010 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.c |
| 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 | */ |