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authorVladimir Voroshilov <voroshil@gmail.com>2008-05-23 03:10:27 +0000
committerVladimir Voroshilov <voroshil@gmail.com>2008-05-23 03:10:27 +0000
commit5b2729cd0bfebbcda403dbb1f9906773dbb9b186 (patch)
tree84c69b4edc39f44c40cc5f723bc1380539e56e23 /libavcodec/acelp_vectors.c
parent4a13a2d4f797ac42498ab6374e2930b5c12a0c0c (diff)
downloadffmpeg-5b2729cd0bfebbcda403dbb1f9906773dbb9b186.tar.gz
adaptive and fixed codebook vector operations for ACELP-based codecs
Originally committed as revision 13244 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec/acelp_vectors.c')
-rw-r--r--libavcodec/acelp_vectors.c147
1 files changed, 147 insertions, 0 deletions
diff --git a/libavcodec/acelp_vectors.c b/libavcodec/acelp_vectors.c
new file mode 100644
index 0000000000..d981fbdc31
--- /dev/null
+++ b/libavcodec/acelp_vectors.c
@@ -0,0 +1,147 @@
+/*
+ * adaptive and fixed codebook vector operations for ACELP-based codecs
+ *
+ * Copyright (c) 2008 Vladimir Voroshilov
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <inttypes.h>
+#include "avcodec.h"
+#include "acelp_vectors.h"
+
+const uint8_t ff_fc_2pulses_9bits_track1[16] =
+{
+ 1, 3,
+ 6, 8,
+ 11, 13,
+ 16, 18,
+ 21, 23,
+ 26, 28,
+ 31, 33,
+ 36, 38
+};
+const uint8_t ff_fc_2pulses_9bits_track1_gray[16] =
+{
+ 1, 3,
+ 8, 6,
+ 18, 16,
+ 11, 13,
+ 38, 36,
+ 31, 33,
+ 21, 23,
+ 28, 26,
+};
+
+const uint8_t ff_fc_2pulses_9bits_track2_gray[32] =
+{
+ 0, 2,
+ 5, 4,
+ 12, 10,
+ 7, 9,
+ 25, 24,
+ 20, 22,
+ 14, 15,
+ 19, 17,
+ 36, 31,
+ 21, 26,
+ 1, 6,
+ 16, 11,
+ 27, 29,
+ 32, 30,
+ 39, 37,
+ 34, 35,
+};
+
+const uint8_t ff_fc_4pulses_8bits_tracks_13[16] =
+{
+ 0, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75,
+};
+
+const uint8_t ff_fc_4pulses_8bits_track_4[32] =
+{
+ 3, 4,
+ 8, 9,
+ 13, 14,
+ 18, 19,
+ 23, 24,
+ 28, 29,
+ 33, 34,
+ 38, 39,
+ 43, 44,
+ 48, 49,
+ 53, 54,
+ 58, 59,
+ 63, 64,
+ 68, 69,
+ 73, 74,
+ 78, 79,
+};
+
+#if 0
+static uint8_t gray_decode[32] =
+{
+ 0, 1, 3, 2, 7, 6, 4, 5,
+ 15, 14, 12, 13, 8, 9, 11, 10,
+ 31, 30, 28, 29, 24, 25, 27, 26,
+ 16, 17, 19, 18, 23, 22, 20, 21
+};
+#endif
+
+void ff_acelp_fc_pulse_per_track(
+ int16_t* fc_v,
+ const uint8_t *tab1,
+ const uint8_t *tab2,
+ int pulse_indices,
+ int pulse_signs,
+ int pulse_count,
+ int bits)
+{
+ int mask = (1 << bits) - 1;
+ int i;
+
+ for(i=0; i<pulse_count; i++)
+ {
+ fc_v[i + tab1[pulse_indices & mask]] +=
+ (pulse_signs & 1) ? 8191 : -8192; // +/-1 in (2.13)
+
+ pulse_indices >>= bits;
+ pulse_signs >>= 1;
+ }
+
+ fc_v[tab2[pulse_indices]] += (pulse_signs & 1) ? 8191 : -8192;
+}
+
+void ff_acelp_weighted_vector_sum(
+ int16_t* out,
+ const int16_t *in_a,
+ const int16_t *in_b,
+ int16_t weight_coeff_a,
+ int16_t weight_coeff_b,
+ int16_t rounder,
+ int shift,
+ int length)
+{
+ int i;
+
+ // Clipping required here; breaks OVERFLOW test.
+ for(i=0; i<length; i++)
+ out[i] = av_clip_int16((
+ in_a[i] * weight_coeff_a +
+ in_b[i] * weight_coeff_b +
+ rounder) >> shift);
+}