diff options
Diffstat (limited to 'plugins/shn/seek.c')
| -rw-r--r-- | plugins/shn/seek.c | 274 |
1 files changed, 274 insertions, 0 deletions
diff --git a/plugins/shn/seek.c b/plugins/shn/seek.c new file mode 100644 index 00000000..a0eb3af4 --- /dev/null +++ b/plugins/shn/seek.c @@ -0,0 +1,274 @@ +/* seek.c - functions related to real-time seeking + * Copyright (C) 2000-2007 Jason Jordan <shnutils@freeshell.org> + * + * 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + */ + +/* + * $Id: seek.c,v 1.18 2007/03/23 05:49:48 jason Exp $ + */ + +#include <stdlib.h> +#include "shorten.h" +#include "shn.h" + +#define ID3V1_TAG_SIZE 128 + +shn_seek_entry *shn_seek_entry_search(shn_seek_entry *table,ulong goal,ulong min,ulong max,ulong resolution) +{ + ulong med = (min + max) / 2; + shn_seek_entry *middle = table + med; + ulong sample = shn_uchar_to_ulong_le(middle->data); + + shn_debug("Examining seek table entry %lu with sample %lu (min/max = %lu/%lu, goal sample is %lu, resolution is %lu samples)",med,sample,min,max,goal,resolution); + + if (goal < sample) + return shn_seek_entry_search(table,goal,min,med-1,resolution); + if (goal > sample + resolution) + return shn_seek_entry_search(table,goal,med+1,max,resolution); + return middle; +} + +int load_separate_seek_table_generic(char *filename,shn_file *this_shn) +{ + FILE *f; + slong seek_table_len; + + shn_debug("Looking for seek table in separate file: '%s'",filename); + + if (!(f=fopen(filename,"rb"))) + { + return 0; + } + + fseek(f,0,SEEK_END); + seek_table_len = (slong)ftell(f) - SEEK_HEADER_SIZE; + fseek(f,0,SEEK_SET); + + if (fread((void *)this_shn->seek_header.data,1,SEEK_HEADER_SIZE,f) == SEEK_HEADER_SIZE) + { + this_shn->seek_header.version = (slong)shn_uchar_to_ulong_le(this_shn->seek_header.data+4); + this_shn->seek_header.shnFileSize = shn_uchar_to_ulong_le(this_shn->seek_header.data+8); + if (memcmp(this_shn->seek_header.data,SEEK_HEADER_SIGNATURE,strlen(SEEK_HEADER_SIGNATURE)) == 0) + { + if (this_shn->seek_header.shnFileSize != this_shn->wave_header.actual_size) + { + shn_debug("warning: Seek table expected .shn file size %lu differs from actual .shn file size %lu - seek table might not belong to this file", + this_shn->seek_header.shnFileSize,this_shn->wave_header.actual_size); + } + + if ((this_shn->seek_table = malloc(seek_table_len))) + { + if (fread((void *)this_shn->seek_table,1,seek_table_len,f) == seek_table_len) + { + shn_debug("Successfully loaded seek table in separate file: '%s'",filename); + + this_shn->vars.seek_table_entries = seek_table_len / SEEK_ENTRY_SIZE; + + if (this_shn->vars.seek_table_entries > 1) + this_shn->vars.seek_resolution = shn_uchar_to_ulong_le(this_shn->seek_table->data+SEEK_ENTRY_SIZE); + else + this_shn->vars.seek_resolution = SEEK_RESOLUTION; + + fclose(f); + + return 1; + } + } + } + } + + fclose(f); + return 0; +} + +int load_appended_seek_table(shn_file *this_shn,const char *filename,long bytes_from_end) +{ + switch (bytes_from_end) + { + case 0: + shn_debug("Looking for seek table appended to file: '%s'",filename); + break; + case ID3V1_TAG_SIZE: + shn_debug("Looking for seek table hidden behind an ID3v1 tag at the end of file: '%s'",filename); + break; + default: + shn_debug("Looking for seek table located %ld bytes from the end of file: '%s'",bytes_from_end,filename); + break; + } + + deadbeef->fseek(this_shn->vars.fd,-(SEEK_TRAILER_SIZE+bytes_from_end),SEEK_END); + if (deadbeef->fread((void *)this_shn->seek_trailer.data,1,SEEK_TRAILER_SIZE,this_shn->vars.fd) == SEEK_TRAILER_SIZE) + { + this_shn->seek_trailer.seekTableSize = shn_uchar_to_ulong_le(this_shn->seek_trailer.data); + if (memcmp(this_shn->seek_trailer.data+4,SEEK_TRAILER_SIGNATURE,strlen(SEEK_TRAILER_SIGNATURE)) == 0) + { + deadbeef->fseek(this_shn->vars.fd,-(this_shn->seek_trailer.seekTableSize+bytes_from_end),SEEK_END); + this_shn->seek_trailer.seekTableSize -= (SEEK_HEADER_SIZE + SEEK_TRAILER_SIZE); + if (deadbeef->fread((void *)this_shn->seek_header.data,1,SEEK_HEADER_SIZE,this_shn->vars.fd) == SEEK_HEADER_SIZE) + { + this_shn->seek_header.version = (slong)shn_uchar_to_ulong_le(this_shn->seek_header.data+4); + this_shn->seek_header.shnFileSize = shn_uchar_to_ulong_le(this_shn->seek_header.data+8); + if ((this_shn->seek_table = malloc(this_shn->seek_trailer.seekTableSize))) + { + if (deadbeef->fread((void *)this_shn->seek_table,1,this_shn->seek_trailer.seekTableSize,this_shn->vars.fd) == this_shn->seek_trailer.seekTableSize) + { + shn_debug("Successfully loaded seek table appended to file: '%s'",filename); + + this_shn->vars.seek_table_entries = this_shn->seek_trailer.seekTableSize / SEEK_ENTRY_SIZE; + + if (this_shn->vars.seek_table_entries > 1) + this_shn->vars.seek_resolution = shn_uchar_to_ulong_le(this_shn->seek_table->data+SEEK_ENTRY_SIZE); + else + this_shn->vars.seek_resolution = SEEK_RESOLUTION; + + return 1; + } + } + } + } + } + + return 0; +} + +int load_separate_seek_table_samedir(shn_file *this_shn,const char *filename) +{ + char *altfilename,*basefile,*basedir; + + if (!(basefile = shn_get_base_filename(filename))) + { + return 0; + } + + if (!(basedir = shn_get_base_directory(filename))) + { + free(basefile); + return 0; + } + + if (!(altfilename = malloc(strlen(basedir)+strlen(basefile)+sizeof(SEEK_SUFFIX)+3))) + { + shn_debug("Could not allocate memory for same dir filename"); + free(basefile); + free(basedir); + return 0; + } + + sprintf(altfilename,"%s/%s.%s",basedir,basefile,SEEK_SUFFIX); + + free(basefile); + free(basedir); + + if (load_separate_seek_table_generic(altfilename,this_shn)) + { + free(altfilename); + return 1; + } + + free(altfilename); + return 0; +} + +int load_separate_seek_table_relative(shn_file *this_shn,const char *filename) +{ + char *altfilename,*basefile,*basedir; + + if (0 == strcmp(shn_cfg.relative_seek_tables_path,"")) + return 0; + + if (!(basefile = shn_get_base_filename(filename))) + { + return 0; + } + + if (!(basedir = shn_get_base_directory(filename))) + { + free(basefile); + return 0; + } + + if (!(altfilename = malloc(strlen(basedir)+strlen(shn_cfg.relative_seek_tables_path)+strlen(basefile)+sizeof(SEEK_SUFFIX)+4))) + { + shn_debug("Could not allocate memory for absolute filename"); + free(basefile); + free(basedir); + return 0; + } + + sprintf(altfilename,"%s/%s/%s.%s",basedir,shn_cfg.relative_seek_tables_path,basefile,SEEK_SUFFIX); + + free(basefile); + free(basedir); + + if (load_separate_seek_table_generic(altfilename,this_shn)) + { + free(altfilename); + return 1; + } + + free(altfilename); + return 0; +} + +int load_separate_seek_table_absolute(shn_file *this_shn,const char *filename) +{ + char *altfilename,*basefile; + + if (!(basefile = shn_get_base_filename(filename))) + { + return 0; + } + + if (!(altfilename = malloc(strlen(shn_cfg.seek_tables_path)+strlen(basefile)+sizeof(SEEK_SUFFIX)+3))) + { + shn_debug("Could not allocate memory for same dir filename"); + free(basefile); + return 0; + } + + sprintf(altfilename,"%s/%s.%s",shn_cfg.seek_tables_path,basefile,SEEK_SUFFIX); + + free(basefile); + + if (load_separate_seek_table_generic(altfilename,this_shn)) + { + free(altfilename); + return 1; + } + + free(altfilename); + return 0; +} + +void shn_load_seek_table(shn_file *this_shn,const char *filename) +{ + if (load_appended_seek_table(this_shn,filename,0)) + return; + + if (load_appended_seek_table(this_shn,filename,ID3V1_TAG_SIZE)) + return; + + if (load_separate_seek_table_samedir(this_shn,filename)) + return; + + if (load_separate_seek_table_relative(this_shn,filename)) + return; + + if (load_separate_seek_table_absolute(this_shn,filename)) + return; + + shn_debug("Could not find any seek tables"); +} |