| 1 | /* |
| 2 | * This file is part of DisOrder. |
| 3 | * Copyright (C) 2004, 2005, 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 plugins/tracklength-flac.c |
| 19 | * @brief Compute track lengths for FLAC files |
| 20 | */ |
| 21 | #include "tracklength.h" |
| 22 | #include <FLAC/stream_decoder.h> |
| 23 | |
| 24 | /* libFLAC's "simplified" interface is rather heavyweight... */ |
| 25 | |
| 26 | /** @brief State used when computing FLAC file length */ |
| 27 | struct flac_state { |
| 28 | /** @brief Duration or -1 */ |
| 29 | long duration; |
| 30 | |
| 31 | /** @brief File being analyzed */ |
| 32 | const char *path; |
| 33 | }; |
| 34 | |
| 35 | static void flac_metadata(const FLAC__StreamDecoder attribute((unused)) *decoder, |
| 36 | const FLAC__StreamMetadata *metadata, |
| 37 | void *client_data) { |
| 38 | struct flac_state *const state = client_data; |
| 39 | const FLAC__StreamMetadata_StreamInfo *const stream_info |
| 40 | = &metadata->data.stream_info; |
| 41 | |
| 42 | if(metadata->type == FLAC__METADATA_TYPE_STREAMINFO) |
| 43 | /* FLAC uses 0 to mean unknown and conveniently so do we */ |
| 44 | state->duration = (stream_info->total_samples |
| 45 | + stream_info->sample_rate - 1) |
| 46 | / stream_info->sample_rate; |
| 47 | } |
| 48 | |
| 49 | static void flac_error(const FLAC__StreamDecoder attribute((unused)) *decoder, |
| 50 | FLAC__StreamDecoderErrorStatus status, |
| 51 | void *client_data) { |
| 52 | const struct flac_state *const state = client_data; |
| 53 | |
| 54 | disorder_error(0, "error decoding %s: %s", state->path, |
| 55 | FLAC__StreamDecoderErrorStatusString[status]); |
| 56 | } |
| 57 | |
| 58 | static FLAC__StreamDecoderWriteStatus flac_write |
| 59 | (const FLAC__StreamDecoder attribute((unused)) *decoder, |
| 60 | const FLAC__Frame attribute((unused)) *frame, |
| 61 | const FLAC__int32 attribute((unused)) *const buffer_[], |
| 62 | void attribute((unused)) *client_data) { |
| 63 | const struct flac_state *const state = client_data; |
| 64 | |
| 65 | if(state->duration >= 0) |
| 66 | return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT; |
| 67 | else |
| 68 | return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE; |
| 69 | } |
| 70 | |
| 71 | long tl_flac(const char *path) { |
| 72 | FLAC__StreamDecoder *sd = 0; |
| 73 | FLAC__StreamDecoderInitStatus is; |
| 74 | struct flac_state state[1]; |
| 75 | |
| 76 | state->duration = -1; /* error */ |
| 77 | state->path = path; |
| 78 | if(!(sd = FLAC__stream_decoder_new())) { |
| 79 | disorder_error(0, "FLAC__stream_decoder_new failed"); |
| 80 | goto fail; |
| 81 | } |
| 82 | if((is = FLAC__stream_decoder_init_file(sd, path, flac_write, flac_metadata, |
| 83 | flac_error, state))) { |
| 84 | disorder_error(0, "FLAC__stream_decoder_init_file %s: %s", |
| 85 | path, FLAC__StreamDecoderInitStatusString[is]); |
| 86 | goto fail; |
| 87 | } |
| 88 | FLAC__stream_decoder_process_until_end_of_metadata(sd); |
| 89 | fail: |
| 90 | if(sd) |
| 91 | FLAC__stream_decoder_delete(sd); |
| 92 | return state->duration; |
| 93 | } |
| 94 | |
| 95 | /* |
| 96 | Local Variables: |
| 97 | c-basic-offset:2 |
| 98 | comment-column:40 |
| 99 | fill-column:79 |
| 100 | End: |
| 101 | */ |