summaryrefslogtreecommitdiff
path: root/pjmedia/src/pjmedia-codec/speex/stereo.c
diff options
context:
space:
mode:
Diffstat (limited to 'pjmedia/src/pjmedia-codec/speex/stereo.c')
-rw-r--r--pjmedia/src/pjmedia-codec/speex/stereo.c192
1 files changed, 0 insertions, 192 deletions
diff --git a/pjmedia/src/pjmedia-codec/speex/stereo.c b/pjmedia/src/pjmedia-codec/speex/stereo.c
deleted file mode 100644
index f18387e5..00000000
--- a/pjmedia/src/pjmedia-codec/speex/stereo.c
+++ /dev/null
@@ -1,192 +0,0 @@
-/* Copyright (C) 2002 Jean-Marc Valin
- File: stereo.c
-
- Redistribution and use in source and binary forms, with or without
- modification, are permitted provided that the following conditions
- are met:
-
- - Redistributions of source code must retain the above copyright
- notice, this list of conditions and the following disclaimer.
-
- - Redistributions in binary form must reproduce the above copyright
- notice, this list of conditions and the following disclaimer in the
- documentation and/or other materials provided with the distribution.
-
- - Neither the name of the Xiph.org Foundation nor the names of its
- contributors may be used to endorse or promote products derived from
- this software without specific prior written permission.
-
- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
- CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
- LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
- NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-*/
-
-#ifdef HAVE_CONFIG_H
-#include "config.h"
-#endif
-
-#include <speex/speex_stereo.h>
-#include <speex/speex_callbacks.h>
-#include "vq.h"
-#include <math.h>
-
-/*float e_ratio_quant[4] = {1, 1.26, 1.587, 2};*/
-static const float e_ratio_quant[4] = {.25f, .315f, .397f, .5f};
-
-void speex_encode_stereo(float *data, int frame_size, SpeexBits *bits)
-{
- int i, tmp;
- float e_left=0, e_right=0, e_tot=0;
- float balance, e_ratio;
- for (i=0;i<frame_size;i++)
- {
- e_left += ((float)data[2*i])*data[2*i];
- e_right += ((float)data[2*i+1])*data[2*i+1];
- data[i] = .5*(((float)data[2*i])+data[2*i+1]);
- e_tot += ((float)data[i])*data[i];
- }
- balance=(e_left+1)/(e_right+1);
- e_ratio = e_tot/(1+e_left+e_right);
-
- /*Quantization*/
- speex_bits_pack(bits, 14, 5);
- speex_bits_pack(bits, SPEEX_INBAND_STEREO, 4);
-
- balance=4*log(balance);
-
- /*Pack sign*/
- if (balance>0)
- speex_bits_pack(bits, 0, 1);
- else
- speex_bits_pack(bits, 1, 1);
- balance=floor(.5+fabs(balance));
- if (balance>30)
- balance=31;
-
- speex_bits_pack(bits, (int)balance, 5);
-
- /*Quantize energy ratio*/
- tmp=vq_index(&e_ratio, e_ratio_quant, 1, 4);
- speex_bits_pack(bits, tmp, 2);
-}
-
-void speex_encode_stereo_int(spx_int16_t *data, int frame_size, SpeexBits *bits)
-{
- int i, tmp;
- float e_left=0, e_right=0, e_tot=0;
- float balance, e_ratio;
- for (i=0;i<frame_size;i++)
- {
- e_left += ((float)data[2*i])*data[2*i];
- e_right += ((float)data[2*i+1])*data[2*i+1];
- data[i] = .5*(((float)data[2*i])+data[2*i+1]);
- e_tot += ((float)data[i])*data[i];
- }
- balance=(e_left+1)/(e_right+1);
- e_ratio = e_tot/(1+e_left+e_right);
-
- /*Quantization*/
- speex_bits_pack(bits, 14, 5);
- speex_bits_pack(bits, SPEEX_INBAND_STEREO, 4);
-
- balance=4*log(balance);
-
- /*Pack sign*/
- if (balance>0)
- speex_bits_pack(bits, 0, 1);
- else
- speex_bits_pack(bits, 1, 1);
- balance=floor(.5+fabs(balance));
- if (balance>30)
- balance=31;
-
- speex_bits_pack(bits, (int)balance, 5);
-
- /*Quantize energy ratio*/
- tmp=vq_index(&e_ratio, e_ratio_quant, 1, 4);
- speex_bits_pack(bits, tmp, 2);
-}
-
-void speex_decode_stereo(float *data, int frame_size, SpeexStereoState *stereo)
-{
- float balance, e_ratio;
- int i;
- float e_tot=0, e_left, e_right, e_sum;
-
- balance=stereo->balance;
- e_ratio=stereo->e_ratio;
- for (i=frame_size-1;i>=0;i--)
- {
- e_tot += ((float)data[i])*data[i];
- }
- e_sum=e_tot/e_ratio;
- e_left = e_sum*balance / (1+balance);
- e_right = e_sum-e_left;
-
- e_left = sqrt(e_left/(e_tot+.01));
- e_right = sqrt(e_right/(e_tot+.01));
-
- for (i=frame_size-1;i>=0;i--)
- {
- float ftmp=data[i];
- stereo->smooth_left = .98*stereo->smooth_left + .02*e_left;
- stereo->smooth_right = .98*stereo->smooth_right + .02*e_right;
- data[2*i] = stereo->smooth_left*ftmp;
- data[2*i+1] = stereo->smooth_right*ftmp;
- }
-}
-
-void speex_decode_stereo_int(spx_int16_t *data, int frame_size, SpeexStereoState *stereo)
-{
- float balance, e_ratio;
- int i;
- float e_tot=0, e_left, e_right, e_sum;
-
- balance=stereo->balance;
- e_ratio=stereo->e_ratio;
- for (i=frame_size-1;i>=0;i--)
- {
- e_tot += ((float)data[i])*data[i];
- }
- e_sum=e_tot/e_ratio;
- e_left = e_sum*balance / (1+balance);
- e_right = e_sum-e_left;
-
- e_left = sqrt(e_left/(e_tot+.01));
- e_right = sqrt(e_right/(e_tot+.01));
-
- for (i=frame_size-1;i>=0;i--)
- {
- float ftmp=data[i];
- stereo->smooth_left = .98*stereo->smooth_left + .02*e_left;
- stereo->smooth_right = .98*stereo->smooth_right + .02*e_right;
- data[2*i] = stereo->smooth_left*ftmp;
- data[2*i+1] = stereo->smooth_right*ftmp;
- }
-}
-
-int speex_std_stereo_request_handler(SpeexBits *bits, void *state, void *data)
-{
- SpeexStereoState *stereo;
- float sign=1;
- int tmp;
-
- stereo = (SpeexStereoState*)data;
- if (speex_bits_unpack_unsigned(bits, 1))
- sign=-1;
- tmp = speex_bits_unpack_unsigned(bits, 5);
- stereo->balance = exp(sign*.25*tmp);
-
- tmp = speex_bits_unpack_unsigned(bits, 2);
- stereo->e_ratio = e_ratio_quant[tmp];
-
- return 0;
-}
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-03 22:21:01 +0000