1+ /*
2+ * Allegro5 MP3 reader.
3+ * Requires MiniMP3 from https://github.com/lieff/minimp3
4+ * author: Mark Watkin (pmprog) 2019
5+ */
6+
7+
8+ #include "allegro5/allegro.h"
9+ #include "allegro5/allegro_acodec.h"
10+ #include "allegro5/allegro_audio.h"
11+ #include "allegro5/internal/aintern.h"
12+ #include "allegro5/internal/aintern_audio.h"
13+ #include "allegro5/internal/aintern_exitfunc.h"
14+ #include "allegro5/internal/aintern_system.h"
15+ #include "acodec.h"
16+ #include "helper.h"
17+
18+ #define MINIMP3_IMPLEMENTATION
19+ #include <minimp3.h>
20+ #include <minimp3_ex.h>
21+
22+ ALLEGRO_DEBUG_CHANNEL ("acodec" )
23+
24+ static bool mp3_libinit = false;
25+ static mp3dec_t mp3d ;
26+
27+ void mp3_initminimp3 ();
28+
29+ ALLEGRO_SAMPLE * _al_load_mp3 (const char * filename )
30+ {
31+ ALLEGRO_FILE * f ;
32+ ALLEGRO_SAMPLE * spl ;
33+ ASSERT (filename );
34+
35+ f = al_fopen (filename , "rb" );
36+ if (!f )
37+ return NULL ;
38+
39+ spl = _al_load_mp3_f (f );
40+
41+ al_fclose (f );
42+
43+ return spl ;
44+ }
45+
46+ ALLEGRO_SAMPLE * _al_load_mp3_f (ALLEGRO_FILE * f )
47+ {
48+ mp3_initminimp3 (); // Make sure library is initialised
49+
50+ mp3dec_file_info_t info ;
51+ ALLEGRO_SAMPLE * spl = NULL ;
52+
53+ // Read our file size
54+ int64_t filesize = al_fsize (f );
55+ if (filesize == -1 )
56+ return NULL ;
57+
58+ // Allocate buffer and read all the file
59+ size_t fsize = (size_t )al_fsize (f );
60+ uint8_t * mp3data = (uint8_t * )al_malloc (fsize );
61+ size_t readbytes = al_fread (f , mp3data , fsize );
62+ if (readbytes != fsize )
63+ {
64+ al_free (mp3data );
65+ return NULL ;
66+ }
67+
68+ // Decode the file contents, and copy to a new buffer
69+ mp3dec_load_buf (& mp3d , mp3data , filesize , & info , NULL , NULL );
70+ uint8_t * pcmdata = (uint8_t * )al_malloc (info .samples * sizeof (int16_t ));
71+ memcpy (pcmdata , info .buffer , info .samples * sizeof (int16_t ));
72+
73+ // Free file copy, and buffer (which is copied to pcmdata
74+ al_free (mp3data );
75+ al_free (info .buffer );
76+
77+ // Create sample from info variable
78+ spl = al_create_sample (pcmdata , info .samples , info .hz , _al_word_size_to_depth_conf (2 ), _al_count_to_channel_conf (info .channels ), true);
79+
80+ return spl ;
81+ }
82+
83+ ALLEGRO_AUDIO_STREAM * _al_load_mp3_audio_stream (const char * filename , size_t buffer_count , unsigned int samples )
84+ {
85+ ALLEGRO_FILE * f ;
86+ ALLEGRO_AUDIO_STREAM * stream ;
87+ ASSERT (filename );
88+
89+ f = al_fopen (filename , "rb" );
90+ if (!f )
91+ return NULL ;
92+
93+ stream = _al_load_mp3_audio_stream_f (f , buffer_count , samples );
94+ if (!stream ) {
95+ al_fclose (f );
96+ }
97+
98+ return stream ;
99+ }
100+
101+ ALLEGRO_AUDIO_STREAM * _al_load_mp3_audio_stream_f (ALLEGRO_FILE * f , size_t buffer_count , unsigned int samples )
102+ {
103+ mp3_initminimp3 (); // Make sure library is initialised
104+ return NULL ;
105+ }
106+
107+ void mp3_initminimp3 ()
108+ {
109+ if (!mp3_libinit )
110+ {
111+ mp3dec_init (& mp3d );
112+ mp3_libinit = true;
113+ }
114+ }
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