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authorVladimir Voroshilov <voroshil@gmail.com>2008-09-03 01:07:03 +0000
committerVladimir Voroshilov <voroshil@gmail.com>2008-09-03 01:07:03 +0000
commitbc165ee392f3bf1612d401daf86c998c263b731f (patch)
tree0a9ebffb8c3a29ddea7d90e6b2344c57fb286a31 /libavcodec/g729dec.c
parent4834eb191c21af057913955cd7d3f92a685219b9 (diff)
downloadffmpeg-bc165ee392f3bf1612d401daf86c998c263b731f.tar.gz
Another set of approved G.729 chunks (from decoder core)
Originally committed as revision 15168 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec/g729dec.c')
-rw-r--r--libavcodec/g729dec.c43
1 files changed, 43 insertions, 0 deletions
diff --git a/libavcodec/g729dec.c b/libavcodec/g729dec.c
index b2761e4df0..a0a2dba66b 100644
--- a/libavcodec/g729dec.c
+++ b/libavcodec/g729dec.c
@@ -79,6 +79,49 @@ static inline int g729_get_parity(uint8_t value)
return (0x6996966996696996ULL >> (value >> 2)) & 1;
}
+ /*
+ This filter enhances harmonic components of the fixed-codebook vector to
+ improve the quality of the reconstructed speech.
+
+ / fc_v[i], i < pitch_delay
+ fc_v[i] = <
+ \ fc_v[i] + gain_pitch * fc_v[i-pitch_delay], i >= pitch_delay
+ */
+ ff_acelp_weighted_vector_sum(
+ fc + pitch_delay_int[i],
+ fc + pitch_delay_int[i],
+ fc,
+ 1 << 14,
+ av_clip(ctx->gain_pitch, SHARP_MIN, SHARP_MAX),
+ 0,
+ 14,
+ ctx->subframe_size - pitch_delay_int[i]);
+
+ ctx->gain_pitch = cb_gain_1st_8k[parm->gc_1st_index[i]][0] +
+ cb_gain_2nd_8k[parm->gc_2nd_index[i]][0];
+ gain_corr_factor = cb_gain_1st_8k[parm->gc_1st_index[i]][1] +
+ cb_gain_2nd_8k[parm->gc_2nd_index[i]][1];
+
+ /* Routine requires rounding to lowest. */
+ ff_acelp_interpolate(
+ ctx->exc + i*ctx->subframe_size,
+ ctx->exc + i*ctx->subframe_size - pitch_delay_3x/3,
+ ff_acelp_interp_filter,
+ 6,
+ (pitch_delay_3x%3)<<1,
+ 10,
+ ctx->subframe_size);
+
+ ff_acelp_weighted_vector_sum(
+ ctx->exc + i * ctx->subframe_size,
+ ctx->exc + i * ctx->subframe_size,
+ fc,
+ (!voicing && ctx->frame_erasure) ? 0 : ctx->gain_pitch,
+ ( voicing && ctx->frame_erasure) ? 0 : ctx->gain_code,
+ 1<<13,
+ 14,
+ ctx->subframe_size);
+
AVCodec g729_decoder =
{
"g729",