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00022 #include <glib.h>
00023
00024 #include "audio.h"
00025
00026 #define FROM_INT_LOOP(NAME, TYPE, SWAP, OFFSET, RANGE) \
00027 static void NAME (const TYPE * in, gfloat * out, gint samples) \
00028 { \
00029 const TYPE * end = in + samples; \
00030 while (in < end) \
00031 * out ++ = (TYPE) (SWAP (* in ++) - OFFSET) / (gdouble) RANGE; \
00032 }
00033
00034 #define TO_INT_LOOP(NAME, TYPE, SWAP, OFFSET, RANGE) \
00035 static void NAME (const gfloat * in, TYPE * out, gint samples) \
00036 { \
00037 const gfloat * end = in + samples; \
00038 while (in < end) \
00039 { \
00040 gdouble f = * in ++; \
00041 * out ++ = SWAP (OFFSET + (TYPE) (CLAMP (f, -1, 1) * (gdouble) RANGE)); \
00042 } \
00043 }
00044
00045 static inline gint8 noop8 (gint8 i) {return i;}
00046 static inline gint16 noop16 (gint16 i) {return i;}
00047 static inline gint32 noop32 (gint32 i) {return i;}
00048
00049 FROM_INT_LOOP (from_s8, gint8, noop8, 0x00, 0x7f)
00050 FROM_INT_LOOP (from_u8, gint8, noop8, 0x80, 0x7f)
00051 FROM_INT_LOOP (from_s16, gint16, noop16, 0x0000, 0x7fff)
00052 FROM_INT_LOOP (from_u16, gint16, noop16, 0x8000, 0x7fff)
00053 FROM_INT_LOOP (from_s24, gint32, noop32, 0x000000, 0x7fffff)
00054 FROM_INT_LOOP (from_u24, gint32, noop32, 0x800000, 0x7fffff)
00055 FROM_INT_LOOP (from_s32, gint32, noop32, 0x00000000, 0x7fffffff)
00056 FROM_INT_LOOP (from_u32, gint32, noop32, 0x80000000, 0x7fffffff)
00057
00058 TO_INT_LOOP (to_s8, gint8, noop8, 0x00, 0x7f)
00059 TO_INT_LOOP (to_u8, gint8, noop8, 0x80, 0x7f)
00060 TO_INT_LOOP (to_s16, gint16, noop16, 0x0000, 0x7fff)
00061 TO_INT_LOOP (to_u16, gint16, noop16, 0x8000, 0x7fff)
00062 TO_INT_LOOP (to_s24, gint32, noop32, 0x000000, 0x7fffff)
00063 TO_INT_LOOP (to_u24, gint32, noop32, 0x800000, 0x7fffff)
00064 TO_INT_LOOP (to_s32, gint32, noop32, 0x00000000, 0x7fffffff)
00065 TO_INT_LOOP (to_u32, gint32, noop32, 0x80000000, 0x7fffffff)
00066
00067 static inline gint16 swap16 (gint16 i) {return GUINT16_SWAP_LE_BE (i);}
00068 static inline gint32 swap32 (gint32 i) {return GUINT32_SWAP_LE_BE (i);}
00069
00070 FROM_INT_LOOP (from_s16_swap, gint16, swap16, 0x0000, 0x7fff)
00071 FROM_INT_LOOP (from_u16_swap, gint16, swap16, 0x8000, 0x7fff)
00072 FROM_INT_LOOP (from_s24_swap, gint32, swap32, 0x000000, 0x7fffff)
00073 FROM_INT_LOOP (from_u24_swap, gint32, swap32, 0x800000, 0x7fffff)
00074 FROM_INT_LOOP (from_s32_swap, gint32, swap32, 0x00000000, 0x7fffffff)
00075 FROM_INT_LOOP (from_u32_swap, gint32, swap32, 0x80000000, 0x7fffffff)
00076
00077 TO_INT_LOOP (to_s16_swap, gint16, swap16, 0x0000, 0x7fff)
00078 TO_INT_LOOP (to_u16_swap, gint16, swap16, 0x8000, 0x7fff)
00079 TO_INT_LOOP (to_s24_swap, gint32, swap32, 0x000000, 0x7fffff)
00080 TO_INT_LOOP (to_u24_swap, gint32, swap32, 0x800000, 0x7fffff)
00081 TO_INT_LOOP (to_s32_swap, gint32, swap32, 0x00000000, 0x7fffffff)
00082 TO_INT_LOOP (to_u32_swap, gint32, swap32, 0x80000000, 0x7fffffff)
00083
00084 typedef void (* FromFunc) (const void * in, gfloat * out, gint samples);
00085 typedef void (* ToFunc) (const gfloat * in, void * out, gint samples);
00086
00087 struct
00088 {
00089 gint format;
00090 FromFunc from;
00091 ToFunc to;
00092 }
00093 convert_table [] =
00094 {
00095 {FMT_S8, (FromFunc) from_s8, (ToFunc) to_s8},
00096 {FMT_U8, (FromFunc) from_u8, (ToFunc) to_u8},
00097
00098 #if G_BYTE_ORDER == G_LITTLE_ENDIAN
00099 {FMT_S16_LE, (FromFunc) from_s16, (ToFunc) to_s16},
00100 {FMT_U16_LE, (FromFunc) from_u16, (ToFunc) to_u16},
00101 {FMT_S24_LE, (FromFunc) from_s24, (ToFunc) to_s24},
00102 {FMT_U24_LE, (FromFunc) from_u24, (ToFunc) to_u24},
00103 {FMT_S32_LE, (FromFunc) from_s32, (ToFunc) to_s32},
00104 {FMT_U32_LE, (FromFunc) from_u32, (ToFunc) to_u32},
00105
00106 {FMT_S16_BE, (FromFunc) from_s16_swap, (ToFunc) to_s16_swap},
00107 {FMT_U16_BE, (FromFunc) from_u16_swap, (ToFunc) to_u16_swap},
00108 {FMT_S24_BE, (FromFunc) from_s24_swap, (ToFunc) to_s24_swap},
00109 {FMT_U24_BE, (FromFunc) from_u24_swap, (ToFunc) to_u24_swap},
00110 {FMT_S32_BE, (FromFunc) from_s32_swap, (ToFunc) to_s32_swap},
00111 {FMT_U32_BE, (FromFunc) from_u32_swap, (ToFunc) to_u32_swap},
00112 #else
00113 {FMT_S16_BE, (FromFunc) from_s16, (ToFunc) to_s16},
00114 {FMT_U16_BE, (FromFunc) from_u16, (ToFunc) to_u16},
00115 {FMT_S24_BE, (FromFunc) from_s24, (ToFunc) to_s24},
00116 {FMT_U24_BE, (FromFunc) from_u24, (ToFunc) to_u24},
00117 {FMT_S32_BE, (FromFunc) from_s32, (ToFunc) to_s32},
00118 {FMT_U32_BE, (FromFunc) from_u32, (ToFunc) to_u32},
00119
00120 {FMT_S16_LE, (FromFunc) from_s16_swap, (ToFunc) to_s16_swap},
00121 {FMT_U16_LE, (FromFunc) from_u16_swap, (ToFunc) to_u16_swap},
00122 {FMT_S24_LE, (FromFunc) from_s24_swap, (ToFunc) to_s24_swap},
00123 {FMT_U24_LE, (FromFunc) from_u24_swap, (ToFunc) to_u24_swap},
00124 {FMT_S32_LE, (FromFunc) from_s32_swap, (ToFunc) to_s32_swap},
00125 {FMT_U32_LE, (FromFunc) from_u32_swap, (ToFunc) to_u32_swap},
00126 #endif
00127 };
00128
00129 void audio_from_int (const void * in, gint format, gfloat * out, gint samples)
00130 {
00131 gint entry;
00132
00133 for (entry = 0; entry < G_N_ELEMENTS (convert_table); entry ++)
00134 {
00135 if (convert_table[entry].format == format)
00136 {
00137 convert_table[entry].from (in, out, samples);
00138 return;
00139 }
00140 }
00141 }
00142
00143 void audio_to_int (const gfloat * in, void * out, gint format, gint samples)
00144 {
00145 gint entry;
00146
00147 for (entry = 0; entry < G_N_ELEMENTS (convert_table); entry ++)
00148 {
00149 if (convert_table[entry].format == format)
00150 {
00151 convert_table[entry].to (in, out, samples);
00152 return;
00153 }
00154 }
00155 }
00156
00157 void audio_amplify (gfloat * data, gint channels, gint frames, gfloat * factors)
00158 {
00159 gfloat * end = data + channels * frames;
00160 gint channel;
00161
00162 while (data < end)
00163 {
00164 for (channel = 0; channel < channels; channel ++)
00165 {
00166 * data = * data * factors[channel];
00167 data ++;
00168 }
00169 }
00170 }