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| author | Laurent Glayal <spglegle@yahoo.fr> | 2007-09-25 16:05:29 +0000 |
|---|---|---|
| committer | Tim-Philipp Müller <tim@centricular.net> | 2007-09-25 16:05:29 +0000 |
| commit | 89dee84fd7c848abdbb335f255fa0ca092b92bea (patch) | |
| tree | 28513fdb7d830111b63a01c91a1a0562a4463cc5 /gst/law/alaw-decode.c | |
| parent | 46333092307654c2856dd8d6ed1ba2bc94e94566 (diff) | |
| download | gstreamer-plugins-good-89dee84fd7c848abdbb335f255fa0ca092b92bea.tar.gz | |
gst/law/: Use static tables for A-Law decoding and encoding; this makes
Original commit message from CVS:
Based on patch by: Laurent Glayal <spglegle yahoo fr>
* gst/law/alaw-decode.c:
* gst/law/alaw-encode.c:
Use static tables for A-Law decoding and encoding; this makes
A-Law decoding and encoding less CPU-intensive, but increases
the binary size a bit. Leaving old code around for now,
selectable by a define in the code. Fixes #435435.
Diffstat (limited to 'gst/law/alaw-decode.c')
| -rw-r--r-- | gst/law/alaw-decode.c | 57 |
1 files changed, 52 insertions, 5 deletions
diff --git a/gst/law/alaw-decode.c b/gst/law/alaw-decode.c index 43d127d56..4e24102da 100644 --- a/gst/law/alaw-decode.c +++ b/gst/law/alaw-decode.c @@ -51,11 +51,56 @@ static GstElementClass *parent_class = NULL; /*static guint gst_stereo_signals[LAST_SIGNAL] = { 0 }; */ -/* - * alaw_to_s16() - Convert an A-law value to 16-bit linear PCM - * - */ -static gint +/* some day we might have defines in gstconfig.h that tell us about the + * desired cpu/memory/binary size trade-offs */ +#define GST_ALAW_DEC_USE_TABLE + +#ifdef GST_ALAW_DEC_USE_TABLE + +static const gint alaw_to_s16_table[256] = { + -5504, -5248, -6016, -5760, -4480, -4224, -4992, -4736, + -7552, -7296, -8064, -7808, -6528, -6272, -7040, -6784, + -2752, -2624, -3008, -2880, -2240, -2112, -2496, -2368, + -3776, -3648, -4032, -3904, -3264, -3136, -3520, -3392, + -22016, -20992, -24064, -23040, -17920, -16896, -19968, -18944, + -30208, -29184, -32256, -31232, -26112, -25088, -28160, -27136, + -11008, -10496, -12032, -11520, -8960, -8448, -9984, -9472, + -15104, -14592, -16128, -15616, -13056, -12544, -14080, -13568, + -344, -328, -376, -360, -280, -264, -312, -296, + -472, -456, -504, -488, -408, -392, -440, -424, + -88, -72, -120, -104, -24, -8, -56, -40, + -216, -200, -248, -232, -152, -136, -184, -168, + -1376, -1312, -1504, -1440, -1120, -1056, -1248, -1184, + -1888, -1824, -2016, -1952, -1632, -1568, -1760, -1696, + -688, -656, -752, -720, -560, -528, -624, -592, + -944, -912, -1008, -976, -816, -784, -880, -848, + 5504, 5248, 6016, 5760, 4480, 4224, 4992, 4736, + 7552, 7296, 8064, 7808, 6528, 6272, 7040, 6784, + 2752, 2624, 3008, 2880, 2240, 2112, 2496, 2368, + 3776, 3648, 4032, 3904, 3264, 3136, 3520, 3392, + 22016, 20992, 24064, 23040, 17920, 16896, 19968, 18944, + 30208, 29184, 32256, 31232, 26112, 25088, 28160, 27136, + 11008, 10496, 12032, 11520, 8960, 8448, 9984, 9472, + 15104, 14592, 16128, 15616, 13056, 12544, 14080, 13568, + 344, 328, 376, 360, 280, 264, 312, 296, + 472, 456, 504, 488, 408, 392, 440, 424, + 88, 72, 120, 104, 24, 8, 56, 40, + 216, 200, 248, 232, 152, 136, 184, 168, + 1376, 1312, 1504, 1440, 1120, 1056, 1248, 1184, + 1888, 1824, 2016, 1952, 1632, 1568, 1760, 1696, + 688, 656, 752, 720, 560, 528, 624, 592, + 944, 912, 1008, 976, 816, 784, 880, 848 +}; + +static inline gint +alaw_to_s16 (guint8 a_val) +{ + return alaw_to_s16_table[a_val]; +} + +#else /* GST_ALAW_DEC_USE_TABLE */ + +static inline gint alaw_to_s16 (guint8 a_val) { gint t; @@ -73,6 +118,8 @@ alaw_to_s16 (guint8 a_val) return ((a_val & 0x80) ? t : -t); } +#endif /* GST_ALAW_DEC_USE_TABLE */ + static gboolean alawdec_sink_setcaps (GstPad * pad, GstCaps * caps) { |