1/* metaflac - Command-line FLAC metadata editor 2 * Copyright (C) 2001,2002,2003,2004,2005,2006,2007 Josh Coalson 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License 6 * as published by the Free Software Foundation; either version 2 7 * of the License, or (at your option) any later version. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write to the Free Software 16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 17 */ 18 19#if HAVE_CONFIG_H 20# include <config.h> 21#endif 22 23#include "utils.h" 24#include "FLAC/assert.h" 25#include "FLAC/stream_decoder.h" 26#include "FLAC/metadata.h" 27#include "share/grabbag.h" 28#include "operations_shorthand.h" 29 30static FLAC__bool populate_seekpoint_values(const char *filename, FLAC__StreamMetadata *block, FLAC__bool *needs_write); 31 32FLAC__bool do_shorthand_operation__add_seekpoints(const char *filename, FLAC__Metadata_Chain *chain, const char *specification, FLAC__bool *needs_write) 33{ 34 FLAC__bool ok = true, found_seektable_block = false; 35 FLAC__StreamMetadata *block = 0; 36 FLAC__Metadata_Iterator *iterator = FLAC__metadata_iterator_new(); 37 FLAC__uint64 total_samples = 0; 38 unsigned sample_rate = 0; 39 40 if(0 == iterator) 41 die("out of memory allocating iterator"); 42 43 FLAC__metadata_iterator_init(iterator, chain); 44 45 do { 46 block = FLAC__metadata_iterator_get_block(iterator); 47 if(block->type == FLAC__METADATA_TYPE_STREAMINFO) { 48 sample_rate = block->data.stream_info.sample_rate; 49 total_samples = block->data.stream_info.total_samples; 50 } 51 else if(block->type == FLAC__METADATA_TYPE_SEEKTABLE) 52 found_seektable_block = true; 53 } while(!found_seektable_block && FLAC__metadata_iterator_next(iterator)); 54 55 if(total_samples == 0) { 56 fprintf(stderr, "%s: ERROR: cannot add seekpoints because STREAMINFO block does not specify total_samples\n", filename); 57 return false; 58 } 59 60 if(!found_seektable_block) { 61 /* create a new block */ 62 block = FLAC__metadata_object_new(FLAC__METADATA_TYPE_SEEKTABLE); 63 if(0 == block) 64 die("out of memory allocating SEEKTABLE block"); 65 while(FLAC__metadata_iterator_prev(iterator)) 66 ; 67 if(!FLAC__metadata_iterator_insert_block_after(iterator, block)) { 68 print_error_with_chain_status(chain, "%s: ERROR: adding new SEEKTABLE block to metadata", filename); 69 FLAC__metadata_object_delete(block); 70 return false; 71 } 72 /* iterator is left pointing to new block */ 73 FLAC__ASSERT(FLAC__metadata_iterator_get_block(iterator) == block); 74 } 75 76 FLAC__metadata_iterator_delete(iterator); 77 78 FLAC__ASSERT(0 != block); 79 FLAC__ASSERT(block->type == FLAC__METADATA_TYPE_SEEKTABLE); 80 81 if(!grabbag__seektable_convert_specification_to_template(specification, /*only_explicit_placeholders=*/false, total_samples, sample_rate, block, /*spec_has_real_points=*/0)) { 82 fprintf(stderr, "%s: ERROR (internal) preparing seektable with seekpoints\n", filename); 83 return false; 84 } 85 86 ok = populate_seekpoint_values(filename, block, needs_write); 87 88 if(ok) 89 (void) FLAC__format_seektable_sort(&block->data.seek_table); 90 91 return ok; 92} 93 94/* 95 * local routines 96 */ 97 98typedef struct { 99 FLAC__StreamMetadata_SeekTable *seektable_template; 100 FLAC__uint64 samples_written; 101 FLAC__uint64 audio_offset, last_offset; 102 unsigned first_seekpoint_to_check; 103 FLAC__bool error_occurred; 104 FLAC__StreamDecoderErrorStatus error_status; 105} ClientData; 106 107static FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data) 108{ 109 ClientData *cd = (ClientData*)client_data; 110 111 (void)buffer; 112 FLAC__ASSERT(0 != cd); 113 114 if(!cd->error_occurred) { 115 const unsigned blocksize = frame->header.blocksize; 116 const FLAC__uint64 frame_first_sample = cd->samples_written; 117 const FLAC__uint64 frame_last_sample = frame_first_sample + (FLAC__uint64)blocksize - 1; 118 FLAC__uint64 test_sample; 119 unsigned i; 120 for(i = cd->first_seekpoint_to_check; i < cd->seektable_template->num_points; i++) { 121 test_sample = cd->seektable_template->points[i].sample_number; 122 if(test_sample > frame_last_sample) { 123 break; 124 } 125 else if(test_sample >= frame_first_sample) { 126 cd->seektable_template->points[i].sample_number = frame_first_sample; 127 cd->seektable_template->points[i].stream_offset = cd->last_offset - cd->audio_offset; 128 cd->seektable_template->points[i].frame_samples = blocksize; 129 cd->first_seekpoint_to_check++; 130 /* DO NOT: "break;" and here's why: 131 * The seektable template may contain more than one target 132 * sample for any given frame; we will keep looping, generating 133 * duplicate seekpoints for them, and we'll clean it up later, 134 * just before writing the seektable back to the metadata. 135 */ 136 } 137 else { 138 cd->first_seekpoint_to_check++; 139 } 140 } 141 cd->samples_written += blocksize; 142 if(!FLAC__stream_decoder_get_decode_position(decoder, &cd->last_offset)) 143 return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT; 144 return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE; 145 } 146 else 147 return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT; 148} 149 150static void error_callback_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data) 151{ 152 ClientData *cd = (ClientData*)client_data; 153 154 (void)decoder; 155 FLAC__ASSERT(0 != cd); 156 157 if(!cd->error_occurred) { /* don't let multiple errors overwrite the first one */ 158 cd->error_occurred = true; 159 cd->error_status = status; 160 } 161} 162 163FLAC__bool populate_seekpoint_values(const char *filename, FLAC__StreamMetadata *block, FLAC__bool *needs_write) 164{ 165 FLAC__StreamDecoder *decoder; 166 ClientData client_data; 167 FLAC__bool ok = true; 168 169 FLAC__ASSERT(0 != block); 170 FLAC__ASSERT(block->type == FLAC__METADATA_TYPE_SEEKTABLE); 171 172 client_data.seektable_template = &block->data.seek_table; 173 client_data.samples_written = 0; 174 /* client_data.audio_offset must be determined later */ 175 client_data.first_seekpoint_to_check = 0; 176 client_data.error_occurred = false; 177 178 decoder = FLAC__stream_decoder_new(); 179 180 if(0 == decoder) { 181 fprintf(stderr, "%s: ERROR (--add-seekpoint) creating the decoder instance\n", filename); 182 return false; 183 } 184 185 FLAC__stream_decoder_set_md5_checking(decoder, false); 186 FLAC__stream_decoder_set_metadata_ignore_all(decoder); 187 188 if(FLAC__stream_decoder_init_file(decoder, filename, write_callback_, /*metadata_callback=*/0, error_callback_, &client_data) != FLAC__STREAM_DECODER_INIT_STATUS_OK) { 189 fprintf(stderr, "%s: ERROR (--add-seekpoint) initializing the decoder instance (%s)\n", filename, FLAC__stream_decoder_get_resolved_state_string(decoder)); 190 ok = false; 191 } 192 193 if(ok && !FLAC__stream_decoder_process_until_end_of_metadata(decoder)) { 194 fprintf(stderr, "%s: ERROR (--add-seekpoint) decoding file (%s)\n", filename, FLAC__stream_decoder_get_resolved_state_string(decoder)); 195 ok = false; 196 } 197 198 if(ok && !FLAC__stream_decoder_get_decode_position(decoder, &client_data.audio_offset)) { 199 fprintf(stderr, "%s: ERROR (--add-seekpoint) decoding file\n", filename); 200 ok = false; 201 } 202 client_data.last_offset = client_data.audio_offset; 203 204 if(ok && !FLAC__stream_decoder_process_until_end_of_stream(decoder)) { 205 fprintf(stderr, "%s: ERROR (--add-seekpoint) decoding file (%s)\n", filename, FLAC__stream_decoder_get_resolved_state_string(decoder)); 206 ok = false; 207 } 208 209 if(ok && client_data.error_occurred) { 210 fprintf(stderr, "%s: ERROR (--add-seekpoint) decoding file (%u:%s)\n", filename, (unsigned)client_data.error_status, FLAC__StreamDecoderErrorStatusString[client_data.error_status]); 211 ok = false; 212 } 213 214 *needs_write = true; 215 FLAC__stream_decoder_delete(decoder); 216 return ok; 217} 218