1 /* metaflac - Command-line FLAC metadata editor
2 * Copyright (C) 2001,2002,2003,2004,2005,2006,2007 Josh Coalson
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.
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.
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.
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"
30 static FLAC__bool populate_seekpoint_values(const char *filename, FLAC__StreamMetadata *block, FLAC__bool *needs_write);
32 FLAC__bool do_shorthand_operation__add_seekpoints(const char *filename, FLAC__Metadata_Chain *chain, const char *specification, FLAC__bool *needs_write)
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;
41 die("out of memory allocating iterator");
43 FLAC__metadata_iterator_init(iterator, chain);
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;
51 else if(block->type == FLAC__METADATA_TYPE_SEEKTABLE)
52 found_seektable_block = true;
53 } while(!found_seektable_block && FLAC__metadata_iterator_next(iterator));
55 if(total_samples == 0) {
56 fprintf(stderr, "%s: ERROR: cannot add seekpoints because STREAMINFO block does not specify total_samples\n", filename);
60 if(!found_seektable_block) {
61 /* create a new block */
62 block = FLAC__metadata_object_new(FLAC__METADATA_TYPE_SEEKTABLE);
64 die("out of memory allocating SEEKTABLE block");
65 while(FLAC__metadata_iterator_prev(iterator))
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);
72 /* iterator is left pointing to new block */
73 FLAC__ASSERT(FLAC__metadata_iterator_get_block(iterator) == block);
76 FLAC__metadata_iterator_delete(iterator);
78 FLAC__ASSERT(0 != block);
79 FLAC__ASSERT(block->type == FLAC__METADATA_TYPE_SEEKTABLE);
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);
86 ok = populate_seekpoint_values(filename, block, needs_write);
89 (void) FLAC__format_seektable_sort(&block->data.seek_table);
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;
107 static FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data)
109 ClientData *cd = (ClientData*)client_data;
112 FLAC__ASSERT(0 != cd);
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;
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) {
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.
138 cd->first_seekpoint_to_check++;
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;
147 return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
150 static void error_callback_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data)
152 ClientData *cd = (ClientData*)client_data;
155 FLAC__ASSERT(0 != cd);
157 if(!cd->error_occurred) { /* don't let multiple errors overwrite the first one */
158 cd->error_occurred = true;
159 cd->error_status = status;
163 FLAC__bool populate_seekpoint_values(const char *filename, FLAC__StreamMetadata *block, FLAC__bool *needs_write)
165 FLAC__StreamDecoder *decoder;
166 ClientData client_data;
167 FLAC__bool ok = true;
169 FLAC__ASSERT(0 != block);
170 FLAC__ASSERT(block->type == FLAC__METADATA_TYPE_SEEKTABLE);
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;
178 decoder = FLAC__stream_decoder_new();
181 fprintf(stderr, "%s: ERROR (--add-seekpoint) creating the decoder instance\n", filename);
185 FLAC__stream_decoder_set_md5_checking(decoder, false);
186 FLAC__stream_decoder_set_metadata_ignore_all(decoder);
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));
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));
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);
202 client_data.last_offset = client_data.audio_offset;
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));
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]);
215 FLAC__stream_decoder_delete(decoder);