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comparison decoders/mp3.c @ 46:6e13fcc178da

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No longer grabs non-MP3 streams. Added init() and quit() methods.
author Ryan C. Gordon <icculus@icculus.org>
date Sat, 22 Sep 2001 14:41:10 +0000
parents d9e84e857569
children 6df2f69e037e
comparison
equal deleted inserted replaced
45:f7a792fdf7a4 46:6e13fcc178da
44 #if (!defined SOUND_SUPPORTS_MP3) 44 #if (!defined SOUND_SUPPORTS_MP3)
45 #error SOUND_SUPPORTS_MP3 must be defined. 45 #error SOUND_SUPPORTS_MP3 must be defined.
46 #endif 46 #endif
47 47
48 48
49 static int MP3_init(void);
50 static void MP3_quit(void);
49 static int MP3_open(Sound_Sample *sample, const char *ext); 51 static int MP3_open(Sound_Sample *sample, const char *ext);
50 static void MP3_close(Sound_Sample *sample); 52 static void MP3_close(Sound_Sample *sample);
51 static Uint32 MP3_read(Sound_Sample *sample); 53 static Uint32 MP3_read(Sound_Sample *sample);
52 54
53 const Sound_DecoderFunctions __Sound_DecoderFunctions_MP3 = 55 const Sound_DecoderFunctions __Sound_DecoderFunctions_MP3 =
57 "MPEG-1 Layer 3 audio through SMPEG", 59 "MPEG-1 Layer 3 audio through SMPEG",
58 "Ryan C. Gordon <icculus@clutteredmind.org>", 60 "Ryan C. Gordon <icculus@clutteredmind.org>",
59 "http://www.icculus.org/SDL_sound/" 61 "http://www.icculus.org/SDL_sound/"
60 }, 62 },
61 63
62 MP3_open, /* open() method */ 64 MP3_init, /* init() method */
63 MP3_close, /* close() method */ 65 MP3_quit, /* quit() method */
64 MP3_read /* read() method */ 66 MP3_open, /* open() method */
67 MP3_close, /* close() method */
68 MP3_read /* read() method */
65 }; 69 };
70
71
72 static int MP3_init(void)
73 {
74 return(1); /* always succeeds. */
75 } /* MP3_init */
76
77
78 static void MP3_quit(void)
79 {
80 /* it's a no-op. */
81 } /* MP3_quit */
82
66 83
67 static __inline__ void output_version(void) 84 static __inline__ void output_version(void)
68 { 85 {
69 static int first_time = 1; 86 static int first_time = 1;
70 87
84 SMPEG *smpeg; 101 SMPEG *smpeg;
85 SMPEG_Info smpeg_info; 102 SMPEG_Info smpeg_info;
86 SDL_AudioSpec spec; 103 SDL_AudioSpec spec;
87 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; 104 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
88 SDL_RWops *refCounter; 105 SDL_RWops *refCounter;
106 Uint8 mp3_magic[2];
89 107
90 output_version(); 108 output_version();
109
110 /*
111 * SMPEG appears to be far too greedy about what it accepts as input.
112 * This test was adapted from SDL_mixer.
113 */
114 if (SDL_RWread(internal->rw, mp3_magic, sizeof (mp3_magic), 1) != 1)
115 {
116 Sound_SetError("MP3: Could not read MP3 magic.");
117 return(0);
118 }
119 if (mp3_magic[0] != 0xFF || (mp3_magic[1] & 0xF0) != 0xF0)
120 {
121 Sound_SetError("MP3: Not an MP3 stream.");
122 return(0);
123 }
124 SDL_RWseek(internal->rw, -sizeof (mp3_magic), SEEK_CUR);
91 125
92 refCounter = RWops_RWRefCounter_new(internal->rw); 126 refCounter = RWops_RWRefCounter_new(internal->rw);
93 if (refCounter == NULL) 127 if (refCounter == NULL)
94 { 128 {
95 _D(("MP3: Failed to create reference counting RWops.\n")); 129 _D(("MP3: Failed to create reference counting RWops.\n"));