diff options
Diffstat (limited to 'gst/mve/mveaudioenc.c')
| -rw-r--r-- | gst/mve/mveaudioenc.c | 121 |
1 files changed, 77 insertions, 44 deletions
diff --git a/gst/mve/mveaudioenc.c b/gst/mve/mveaudioenc.c index 47c0a3bd..e3cf9377 100644 --- a/gst/mve/mveaudioenc.c +++ b/gst/mve/mveaudioenc.c @@ -20,37 +20,55 @@ */ #include <math.h> +#include <stdlib.h> #include <gst/gst.h> -static const gint32 dec_table[256] = - {
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
16, 17, 18, 19, - 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
32, 33, 34, 35, 36, 37, - 38, 39, 40, 41, 42, 43, 47, 51, 56, 61,
66, 72, 79, 86, 94, 102, 112, - 122, 133, 145, 158, 173, 189, 206, 225, 245,
267, 292, 318, 348, 379, - 414, 452, 493, 538, 587, 640, 699, 763, 832, 908, 991,
1081, 1180, 1288, +static const gint32 dec_table[256] = { + 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, + 16, 17, 18, 19, + 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, + 32, 33, 34, 35, 36, 37, + 38, 39, 40, 41, 42, 43, 47, 51, 56, 61, + 66, 72, 79, 86, 94, 102, 112, + 122, 133, 145, 158, 173, 189, 206, 225, 245, + 267, 292, 318, 348, 379, + 414, 452, 493, 538, 587, 640, 699, 763, 832, 908, 991, + 1081, 1180, 1288, 1405, 1534, 1673, 1826, 1993, 2175, 2373, 2590, 2826, 3084, 3365, 3672, - 4008,
4373, 4772, 5208, 5683, 6202, 6767, 7385, 8059, 8794, 9597, 10472, - 11428, 12471, 13609, 14851, 16206,
17685, 19298, 21060, 22981, 25078, + 4008, + 4373, 4772, 5208, 5683, 6202, 6767, 7385, 8059, 8794, 9597, 10472, + 11428, 12471, 13609, 14851, 16206, + 17685, 19298, 21060, 22981, 25078, 27367, 29864, 32589, 35563, 38808, 42350, 46214, 50431, 55033, 60055, - 65535,
1, -65535, -60055, -55033, -50431, -46214, -42350, -38808, -35563, - -32589, -29864, -27367, -25078, -22981, -21060, -19298,
-17685, -16206, + 65535, + 1, -65535, -60055, -55033, -50431, -46214, -42350, -38808, -35563, + -32589, -29864, -27367, -25078, -22981, -21060, -19298, + -17685, -16206, -14851, -13609, -12471, -11428, -10472, -9597, -8794, -8059, -7385, -6767, - -6202, -5683, -5208, -4772,
-4373, -4008, -3672, -3365, -3084, -2826, + -6202, -5683, -5208, -4772, + -4373, -4008, -3672, -3365, -3084, -2826, -2590, -2373, -2175, -1993, -1826, -1673, -1534, -1405, -1288, -1180, -
-1081, -991, -908, -832, -763, -699, -640, -587, -538, -493, -452, -414, - -379, -348, -318, -292,
-267, -245, -225, -206, -189, -173, -158, -145, - -133, -122, -112, -102, -94, -86, -79, -72,
-66, -61, -56, -51, -47, -43, - -42, -41, -40, -39, -38, -37, -36, -35, -34, -33,
-32, -31, -30, -29, - -28, -27, -26, -25, -24, -23, -22, -21, -20, -19, -18, -17,
-16, -15, - -14, -13, -12, -11, -10, -9, -8, -7, -6, -5, -4, -3, -2, -1
+ + -1081, -991, -908, -832, -763, -699, -640, -587, -538, -493, -452, -414, + -379, -348, -318, -292, + -267, -245, -225, -206, -189, -173, -158, -145, + -133, -122, -112, -102, -94, -86, -79, -72, + -66, -61, -56, -51, -47, -43, + -42, -41, -40, -39, -38, -37, -36, -35, -34, -33, + -32, -31, -30, -29, + -28, -27, -26, -25, -24, -23, -22, -21, -20, -19, -18, -17, + -16, -15, + -14, -13, -12, -11, -10, -9, -8, -7, -6, -5, -4, -3, -2, -1 }; -
-/* This value could be non-optimal. Without knowledge of the value
- distribution in the real signal, the actual optimum cannot be evaluated.
- Should be somewhere between 11.458 and 11.542. */
+ + +/* This value could be non-optimal. Without knowledge of the value + distribution in the real signal, the actual optimum cannot be evaluated. + Should be somewhere between 11.458 and 11.542. */ static const gdouble DPCM_SCALE = 11.5131; -
static gint8 + +static gint8 mve_enc_delta (guint n) { if (n < 44) @@ -81,40 +99,55 @@ mve_compress_audio (guint8 * dest, const guint8 * src, guint16 len, src += 2; delta = s - prev[cur_chan]; -
if (delta >= 0) -
v = mve_enc_delta (delta); -
+ + if (delta >= 0) + + v = mve_enc_delta (delta); + else -
v = 256 - mve_enc_delta (-delta); -
real_res = dec_table[v] + prev[cur_chan]; -
if (real_res < -32768 || real_res > 32767) { -
- /* correct overflow */
- /* GST_DEBUG ("co:%d + %d = %d -> new v:%d, dec_table:%d will be %d", - prev[cur_chan], dec_table[v], real_res, - v, dec_table[v], prev[cur_chan]+dec_table[v]); */ - if (s > 0) { -
if (real_res > 32767) + + v = 256 - mve_enc_delta (-delta); + + + real_res = dec_table[v] + prev[cur_chan]; + + if (real_res < -32768 || real_res > 32767) { + + /* correct overflow */ + /* GST_DEBUG ("co:%d + %d = %d -> new v:%d, dec_table:%d will be %d", + prev[cur_chan], dec_table[v], real_res, + v, dec_table[v], prev[cur_chan]+dec_table[v]); */ + if (s > 0) { + + if (real_res > 32767) --v; -
} else { -
if (real_res < -32768) + + } else { + + if (real_res < -32768) ++v; -
} + + } real_res = dec_table[v] + prev[cur_chan]; -
} + + } if (G_UNLIKELY (abs (real_res - s) > 32767)) { GST_ERROR ("sign loss left unfixed in audio stream, deviation:%d", real_res - s); return -1; } -
*dest++ = v; -
--len; - /* use previous output instead of input. That way output will not go too far from input. */
- prev[cur_chan] += dec_table[v]; + + + *dest++ = v; + + --len; + /* use previous output instead of input. That way output will not go too far from input. */ + prev[cur_chan] += dec_table[v]; cur_chan = channels - 1 - cur_chan; -
} + + } return 0; } |