cadb3627fc
librbcodec users must provide these two files when the library is built. rbcodecconfig.h provides configuration #defines and basic types, and will be included by public librbcodec headers, so it must not conflict with the user's code. rbcodecplatform.h provides various OS functions, and will only be included by source files and private headers. This system is intended to provide maximum flexibility for use on embedded systems, where no operating system headers are included. Unix systems can just copy rbcodecconfig-example.h and rbcodecplatform-unix.h with minimal changes. Change-Id: I350a2274d173da391fd1ca00c4202e9760d91def Reviewed-on: http://gerrit.rockbox.org/143 Reviewed-by: Nils Wallménius <nils@rockbox.org> Tested-by: Nils Wallménius <nils@rockbox.org>
148 lines
3.9 KiB
C
148 lines
3.9 KiB
C
#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include <inttypes.h>
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#include "platform.h"
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#include "metadata.h"
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#include "metadata_common.h"
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#include "metadata_parsers.h"
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#include "rbunicode.h"
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/* Taken from blargg's Game_Music_Emu library */
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typedef unsigned char byte;
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/* AY file header */
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enum { header_size = 0x14 };
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struct header_t
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{
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byte tag[8];
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byte vers;
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byte player;
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byte unused[2];
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byte author[2];
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byte comment[2];
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byte max_track;
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byte first_track;
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byte track_info[2];
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};
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struct file_t {
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struct header_t const* header;
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byte const* tracks;
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byte const* end; /* end of file data */
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};
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static int get_be16( const void *a )
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{
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return get_short_be( (void*) a );
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}
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/* Given pointer to 2-byte offset of data, returns pointer to data, or NULL if
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* offset is 0 or there is less than min_size bytes of data available. */
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static byte const* get_data( struct file_t const* file, byte const ptr [], int min_size )
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{
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int offset = (int16_t) get_be16( ptr );
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int pos = ptr - (byte const*) file->header;
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int size = file->end - (byte const*) file->header;
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int limit = size - min_size;
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if ( limit < 0 || !offset || (unsigned) (pos + offset) > (unsigned) limit )
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return NULL;
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return ptr + offset;
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}
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static const char *parse_header( byte const in [], int size, struct file_t* out )
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{
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if ( size < header_size )
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return "wrong file type";
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out->header = (struct header_t const*) in;
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out->end = in + size;
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struct header_t const* h = (struct header_t const*) in;
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if ( memcmp( h->tag, "ZXAYEMUL", 8 ) )
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return "wrong file type";
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out->tracks = get_data( out, h->track_info, (h->max_track + 1) * 4 );
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if ( !out->tracks )
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return "missing track data";
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return 0;
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}
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static void copy_ay_fields( struct file_t const* file, struct mp3entry* id3, int track )
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{
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int track_count = file->header->max_track + 1;
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/* calculate track length based on number of subtracks */
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if (track_count > 1) {
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id3->length = file->header->max_track * 1000;
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} else {
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byte const* track_info = get_data( file, file->tracks + track * 4 + 2, 6 );
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if (track_info)
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id3->length = get_be16( track_info + 4 ) * (1000 / 50); /* frames to msec */
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else id3->length = 120 * 1000;
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}
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if ( id3->length <= 0 )
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id3->length = 120 * 1000; /* 2 minutes */
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/* If meta info was found in the m3u skip next step */
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if (id3->title && id3->title[0]) return;
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/* If file has more than one track will
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use file name as title */
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char * tmp;
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if (track_count <= 1) {
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tmp = (char *) get_data( file, file->tracks + track * 4, 1 );
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if ( tmp ) id3->title = tmp;
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}
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/* Author */
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tmp = (char *) get_data( file, file->header->author, 1 );
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if (tmp) id3->artist = tmp;
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/* Comment */
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tmp = (char *) get_data( file, file->header->comment, 1 );
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if (tmp) id3->comment = tmp;
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}
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static bool parse_ay_header(int fd, struct mp3entry *id3)
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{
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/* Use the trackname part of the id3 structure as a temporary buffer */
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unsigned char* buf = (unsigned char *)id3->id3v2buf;
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struct file_t file;
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int read_bytes;
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lseek(fd, 0, SEEK_SET);
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if ((read_bytes = read(fd, buf, ID3V2_BUF_SIZE)) < header_size)
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return false;
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buf [ID3V2_BUF_SIZE] = '\0';
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if ( parse_header( buf, read_bytes, &file ) )
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return false;
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copy_ay_fields( &file, id3, 0 );
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return true;
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}
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bool get_ay_metadata(int fd, struct mp3entry* id3)
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{
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char ay_type[8];
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if ((lseek(fd, 0, SEEK_SET) < 0) ||
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read(fd, ay_type, 8) < 8)
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return false;
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id3->vbr = false;
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id3->filesize = filesize(fd);
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id3->bitrate = 706;
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id3->frequency = 44100;
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/* Make sure this is a ZX Ay file */
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if (memcmp( ay_type, "ZXAYEMUL", 8 ) != 0)
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return false;
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return parse_ay_header(fd, id3);
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}
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