| /* metaflac - Command-line FLAC metadata editor |
| * Copyright (C) 2001-2009 Josh Coalson |
| * Copyright (C) 2011-2016 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); |
| 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); |
| 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; |
| } |