diff options
Diffstat (limited to 'apps/codecs/libgme/resampler.h')
-rw-r--r-- | apps/codecs/libgme/resampler.h | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/apps/codecs/libgme/resampler.h b/apps/codecs/libgme/resampler.h new file mode 100644 index 0000000000..f5e8c55119 --- /dev/null +++ b/apps/codecs/libgme/resampler.h | |||
@@ -0,0 +1,68 @@ | |||
1 | // Combination of Downsampler and Blip_Buffer mixing. Used by Sega FM emulators. | ||
2 | |||
3 | // Game_Music_Emu 0.5.5 | ||
4 | #ifndef RESAMPLER_H | ||
5 | #define RESAMPLER_H | ||
6 | |||
7 | #include "blargg_config.h" | ||
8 | #include "multi_buffer.h" | ||
9 | |||
10 | typedef short dsample_t; | ||
11 | |||
12 | enum { stereo = 2 }; | ||
13 | enum { max_buf_size = 3960 }; | ||
14 | enum { max_resampler_size = 5942 }; | ||
15 | enum { write_offset = 8 * stereo }; | ||
16 | enum { gain_bits = 14 }; | ||
17 | |||
18 | struct Resampler { | ||
19 | int (*callback)( void*, blip_time_t, int, dsample_t* ); | ||
20 | void* callback_data; | ||
21 | |||
22 | dsample_t sample_buf [max_buf_size]; | ||
23 | int sample_buf_size; | ||
24 | int oversamples_per_frame; | ||
25 | int buf_pos; | ||
26 | int resampler_size; | ||
27 | int gain_; | ||
28 | |||
29 | // Internal resampler | ||
30 | dsample_t buf [max_resampler_size]; | ||
31 | int buffer_size; | ||
32 | |||
33 | int write_pos; | ||
34 | double rate_; | ||
35 | |||
36 | int pos; | ||
37 | int step; | ||
38 | }; | ||
39 | |||
40 | static inline void Resampler_init( struct Resampler* this ) | ||
41 | { | ||
42 | this->pos = 0; | ||
43 | this->write_pos = 0; | ||
44 | this->rate_ = 0; | ||
45 | } | ||
46 | |||
47 | blargg_err_t Resampler_reset( struct Resampler* this, int max_pairs ); | ||
48 | void Resampler_resize( struct Resampler* this, int pairs_per_frame ); | ||
49 | |||
50 | void Resampler_play( struct Resampler* this, long count, dsample_t* out, struct Stereo_Buffer* ) ICODE_ATTR; | ||
51 | |||
52 | static inline void Resampler_set_callback(struct Resampler* this, int (*func)( void*, blip_time_t, int, dsample_t* ), void* user_data ) | ||
53 | { | ||
54 | this->callback = func; | ||
55 | this->callback_data = user_data; | ||
56 | } | ||
57 | |||
58 | blargg_err_t Resampler_setup( struct Resampler* this, double oversample, double rolloff, double gain ); | ||
59 | |||
60 | static inline void Resampler_clear( struct Resampler* this ) | ||
61 | { | ||
62 | this->buf_pos = this->sample_buf_size; | ||
63 | |||
64 | this->pos = 0; | ||
65 | this->write_pos = 0; | ||
66 | } | ||
67 | |||
68 | #endif | ||