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/* metaflac - Command-line FLAC metadata editor
* Copyright (C) 2001-2009 Josh Coalson
* Copyright (C) 2011-2023 Xiph.Org Foundation
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include "utils.h"
#include "FLAC/assert.h"
#include "FLAC/stream_decoder.h"
#include "FLAC/metadata.h"
#include "share/grabbag.h"
#include "operations_shorthand.h"
static FLAC__bool populate_seekpoint_values(const char *filename, FLAC__StreamMetadata *block, FLAC__bool *needs_write);
FLAC__bool do_shorthand_operation__add_seekpoints(const char *filename, FLAC__Metadata_Chain *chain, const char *specification, FLAC__bool *needs_write)
{
FLAC__bool ok = true, found_seektable_block = false;
FLAC__StreamMetadata *block = 0;
FLAC__Metadata_Iterator *iterator = FLAC__metadata_iterator_new();
FLAC__uint64 total_samples = 0;
unsigned sample_rate = 0;
if(0 == iterator)
die("out of memory allocating iterator");
FLAC__metadata_iterator_init(iterator, chain);
do {
block = FLAC__metadata_iterator_get_block(iterator);
if(block->type == FLAC__METADATA_TYPE_STREAMINFO) {
sample_rate = block->data.stream_info.sample_rate;
total_samples = block->data.stream_info.total_samples;
}
else if(block->type == FLAC__METADATA_TYPE_SEEKTABLE)
found_seektable_block = true;
} while(!found_seektable_block && FLAC__metadata_iterator_next(iterator));
if(total_samples == 0) {
flac_fprintf(stderr, "%s: ERROR: cannot add seekpoints because STREAMINFO block does not specify total_samples\n", filename);
FLAC__metadata_iterator_delete(iterator);
return false;
}
if(!found_seektable_block) {
/* create a new block */
block = FLAC__metadata_object_new(FLAC__METADATA_TYPE_SEEKTABLE);
if(0 == block)
die("out of memory allocating SEEKTABLE block");
while(FLAC__metadata_iterator_prev(iterator))
;
if(!FLAC__metadata_iterator_insert_block_after(iterator, block)) {
print_error_with_chain_status(chain, "%s: ERROR: adding new SEEKTABLE block to metadata", filename);
FLAC__metadata_object_delete(block);
FLAC__metadata_iterator_delete(iterator);
return false;
}
/* iterator is left pointing to new block */
FLAC__ASSERT(FLAC__metadata_iterator_get_block(iterator) == block);
}
FLAC__metadata_iterator_delete(iterator);
FLAC__ASSERT(0 != block);
FLAC__ASSERT(block->type == FLAC__METADATA_TYPE_SEEKTABLE);
if(!grabbag__seektable_convert_specification_to_template(specification, /*only_explicit_placeholders=*/false, total_samples, sample_rate, block, /*spec_has_real_points=*/0)) {
flac_fprintf(stderr, "%s: ERROR (internal) preparing seektable with seekpoints\n", filename);
return false;
}
ok = populate_seekpoint_values(filename, block, needs_write);
if(ok)
(void) FLAC__format_seektable_sort(&block->data.seek_table);
return ok;
}
/*
* local routines
*/
typedef struct {
FLAC__StreamMetadata_SeekTable *seektable_template;
FLAC__uint64 samples_written;
FLAC__uint64 audio_offset, last_offset;
unsigned first_seekpoint_to_check;
FLAC__bool error_occurred;
FLAC__StreamDecoderErrorStatus error_status;
} ClientData;
static FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data)
{
ClientData *cd = (ClientData*)client_data;
(void)buffer;
FLAC__ASSERT(0 != cd);
if(!cd->error_occurred) {
const unsigned blocksize = frame->header.blocksize;
const FLAC__uint64 frame_first_sample = cd->samples_written;
const FLAC__uint64 frame_last_sample = frame_first_sample + (FLAC__uint64)blocksize - 1;
FLAC__uint64 test_sample;
unsigned i;
for(i = cd->first_seekpoint_to_check; i < cd->seektable_template->num_points; i++) {
test_sample = cd->seektable_template->points[i].sample_number;
if(test_sample > frame_last_sample) {
break;
}
else if(test_sample >= frame_first_sample) {
cd->seektable_template->points[i].sample_number = frame_first_sample;
cd->seektable_template->points[i].stream_offset = cd->last_offset - cd->audio_offset;
cd->seektable_template->points[i].frame_samples = blocksize;
cd->first_seekpoint_to_check++;
/* DO NOT: "break;" and here's why:
* The seektable template may contain more than one target
* sample for any given frame; we will keep looping, generating
* duplicate seekpoints for them, and we'll clean it up later,
* just before writing the seektable back to the metadata.
*/
}
else {
cd->first_seekpoint_to_check++;
}
}
cd->samples_written += blocksize;
if(!FLAC__stream_decoder_get_decode_position(decoder, &cd->last_offset))
return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
}
else
return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
}
static void error_callback_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data)
{
ClientData *cd = (ClientData*)client_data;
(void)decoder;
FLAC__ASSERT(0 != cd);
if(!cd->error_occurred) { /* don't let multiple errors overwrite the first one */
cd->error_occurred = true;
cd->error_status = status;
}
}
FLAC__bool populate_seekpoint_values(const char *filename, FLAC__StreamMetadata *block, FLAC__bool *needs_write)
{
FLAC__StreamDecoder *decoder;
ClientData client_data;
FLAC__bool ok = true;
FLAC__ASSERT(0 != block);
FLAC__ASSERT(block->type == FLAC__METADATA_TYPE_SEEKTABLE);
client_data.seektable_template = &block->data.seek_table;
client_data.samples_written = 0;
/* client_data.audio_offset must be determined later */
client_data.first_seekpoint_to_check = 0;
client_data.error_occurred = false;
decoder = FLAC__stream_decoder_new();
if(0 == decoder) {
flac_fprintf(stderr, "%s: ERROR (--add-seekpoint) creating the decoder instance\n", filename);
return false;
}
FLAC__stream_decoder_set_md5_checking(decoder, false);
FLAC__stream_decoder_set_metadata_ignore_all(decoder);
if(FLAC__stream_decoder_init_file(decoder, filename, write_callback_, /*metadata_callback=*/0, error_callback_, &client_data) != FLAC__STREAM_DECODER_INIT_STATUS_OK) {
flac_fprintf(stderr, "%s: ERROR (--add-seekpoint) initializing the decoder instance (%s)\n", filename, FLAC__stream_decoder_get_resolved_state_string(decoder));
ok = false;
}
if(ok && !FLAC__stream_decoder_process_until_end_of_metadata(decoder)) {
flac_fprintf(stderr, "%s: ERROR (--add-seekpoint) decoding file (%s)\n", filename, FLAC__stream_decoder_get_resolved_state_string(decoder));
ok = false;
}
if(ok && !FLAC__stream_decoder_get_decode_position(decoder, &client_data.audio_offset)) {
flac_fprintf(stderr, "%s: ERROR (--add-seekpoint) decoding file\n", filename);
ok = false;
}
client_data.last_offset = client_data.audio_offset;
if(ok && !FLAC__stream_decoder_process_until_end_of_stream(decoder)) {
flac_fprintf(stderr, "%s: ERROR (--add-seekpoint) decoding file (%s)\n", filename, FLAC__stream_decoder_get_resolved_state_string(decoder));
ok = false;
}
if(ok && client_data.error_occurred) {
flac_fprintf(stderr, "%s: ERROR (--add-seekpoint) decoding file (%u:%s)\n", filename, (unsigned)client_data.error_status, FLAC__StreamDecoderErrorStatusString[client_data.error_status]);
ok = false;
}
*needs_write = true;
FLAC__stream_decoder_delete(decoder);
return ok;
}
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