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-rw-r--r--contrib/ffmpeg/libavcodec/liba52/resample_c.c203
1 files changed, 203 insertions, 0 deletions
diff --git a/contrib/ffmpeg/libavcodec/liba52/resample_c.c b/contrib/ffmpeg/libavcodec/liba52/resample_c.c
new file mode 100644
index 000000000..905146a7d
--- /dev/null
+++ b/contrib/ffmpeg/libavcodec/liba52/resample_c.c
@@ -0,0 +1,203 @@
+/*
+ * this code is based on a52dec/libao/audio_out_oss.c
+ * copyright (C) 2001 Arpad Gereoffy
+ *
+ * This file is part of a52dec, a free ATSC A-52 stream decoder.
+ * See http://liba52.sourceforge.net/ for updates.
+ *
+ * a52dec is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * a52dec 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+static inline int16_t convert (int32_t i)
+{
+ if (i > 0x43c07fff)
+ return 32767;
+ else if (i < 0x43bf8000)
+ return -32768;
+ else
+ return i - 0x43c00000;
+}
+
+static int a52_resample_MONO_to_5_C(float * _f, int16_t * s16){
+ int i;
+ int32_t * f = (int32_t *) _f;
+ for (i = 0; i < 256; i++) {
+ s16[5*i] = s16[5*i+1] = s16[5*i+2] = s16[5*i+3] = 0;
+ s16[5*i+4] = convert (f[i]);
+ }
+ return 5*256;
+}
+
+static int a52_resample_MONO_to_1_C(float * _f, int16_t * s16){
+ int i;
+ int32_t * f = (int32_t *) _f;
+ for (i = 0; i < 256; i++) {
+ s16[i] = convert (f[i]);
+ }
+ return 1*256;
+}
+
+static int a52_resample_STEREO_to_2_C(float * _f, int16_t * s16){
+ int i;
+ int32_t * f = (int32_t *) _f;
+ for (i = 0; i < 256; i++) {
+ s16[2*i] = convert (f[i]);
+ s16[2*i+1] = convert (f[i+256]);
+ }
+ return 2*256;
+}
+
+static int a52_resample_3F_to_5_C(float * _f, int16_t * s16){
+ int i;
+ int32_t * f = (int32_t *) _f;
+ for (i = 0; i < 256; i++) {
+ s16[5*i] = convert (f[i]);
+ s16[5*i+1] = convert (f[i+512]);
+ s16[5*i+2] = s16[5*i+3] = 0;
+ s16[5*i+4] = convert (f[i+256]);
+ }
+ return 5*256;
+}
+
+static int a52_resample_2F_2R_to_4_C(float * _f, int16_t * s16){
+ int i;
+ int32_t * f = (int32_t *) _f;
+ for (i = 0; i < 256; i++) {
+ s16[4*i] = convert (f[i]);
+ s16[4*i+1] = convert (f[i+256]);
+ s16[4*i+2] = convert (f[i+512]);
+ s16[4*i+3] = convert (f[i+768]);
+ }
+ return 4*256;
+}
+
+static int a52_resample_3F_2R_to_5_C(float * _f, int16_t * s16){
+ int i;
+ int32_t * f = (int32_t *) _f;
+ for (i = 0; i < 256; i++) {
+ s16[5*i] = convert (f[i]);
+ s16[5*i+1] = convert (f[i+512]);
+ s16[5*i+2] = convert (f[i+768]);
+ s16[5*i+3] = convert (f[i+1024]);
+ s16[5*i+4] = convert (f[i+256]);
+ }
+ return 5*256;
+}
+
+static int a52_resample_MONO_LFE_to_6_C(float * _f, int16_t * s16){
+ int i;
+ int32_t * f = (int32_t *) _f;
+ for (i = 0; i < 256; i++) {
+ s16[6*i] = s16[6*i+1] = s16[6*i+2] = s16[6*i+3] = 0;
+ s16[6*i+4] = convert (f[i+256]);
+ s16[6*i+5] = convert (f[i]);
+ }
+ return 6*256;
+}
+
+static int a52_resample_STEREO_LFE_to_6_C(float * _f, int16_t * s16){
+ int i;
+ int32_t * f = (int32_t *) _f;
+ for (i = 0; i < 256; i++) {
+ s16[6*i] = convert (f[i+256]);
+ s16[6*i+1] = convert (f[i+512]);
+ s16[6*i+2] = s16[6*i+3] = s16[6*i+4] = 0;
+ s16[6*i+5] = convert (f[i]);
+ }
+ return 6*256;
+}
+
+static int a52_resample_3F_LFE_to_6_C(float * _f, int16_t * s16){
+ int i;
+ int32_t * f = (int32_t *) _f;
+ for (i = 0; i < 256; i++) {
+ s16[6*i] = convert (f[i+256]);
+ s16[6*i+1] = convert (f[i+768]);
+ s16[6*i+2] = s16[6*i+3] = 0;
+ s16[6*i+4] = convert (f[i+512]);
+ s16[6*i+5] = convert (f[i]);
+ }
+ return 6*256;
+}
+
+static int a52_resample_2F_2R_LFE_to_6_C(float * _f, int16_t * s16){
+ int i;
+ int32_t * f = (int32_t *) _f;
+ for (i = 0; i < 256; i++) {
+ s16[6*i] = convert (f[i+256]);
+ s16[6*i+1] = convert (f[i+512]);
+ s16[6*i+2] = convert (f[i+768]);
+ s16[6*i+3] = convert (f[i+1024]);
+ s16[6*i+4] = 0;
+ s16[6*i+5] = convert (f[i]);
+ }
+ return 6*256;
+}
+
+static int a52_resample_3F_2R_LFE_to_6_C(float * _f, int16_t * s16){
+ int i;
+ int32_t * f = (int32_t *) _f;
+ for (i = 0; i < 256; i++) {
+ s16[6*i] = convert (f[i+256]);
+ s16[6*i+1] = convert (f[i+768]);
+ s16[6*i+2] = convert (f[i+1024]);
+ s16[6*i+3] = convert (f[i+1280]);
+ s16[6*i+4] = convert (f[i+512]);
+ s16[6*i+5] = convert (f[i]);
+ }
+ return 6*256;
+}
+
+
+static void* a52_resample_C(int flags, int ch){
+ switch (flags) {
+ case A52_MONO:
+ if(ch==5) return a52_resample_MONO_to_5_C;
+ if(ch==1) return a52_resample_MONO_to_1_C;
+ break;
+ case A52_CHANNEL:
+ case A52_STEREO:
+ case A52_DOLBY:
+ if(ch==2) return a52_resample_STEREO_to_2_C;
+ break;
+ case A52_3F:
+ if(ch==5) return a52_resample_3F_to_5_C;
+ break;
+ case A52_2F2R:
+ if(ch==4) return a52_resample_2F_2R_to_4_C;
+ break;
+ case A52_3F2R:
+ if(ch==5) return a52_resample_3F_2R_to_5_C;
+ break;
+ case A52_MONO | A52_LFE:
+ if(ch==6) return a52_resample_MONO_LFE_to_6_C;
+ break;
+ case A52_CHANNEL | A52_LFE:
+ case A52_STEREO | A52_LFE:
+ case A52_DOLBY | A52_LFE:
+ if(ch==6) return a52_resample_STEREO_LFE_to_6_C;
+ break;
+ case A52_3F | A52_LFE:
+ if(ch==6) return a52_resample_3F_LFE_to_6_C;
+ break;
+ case A52_2F2R | A52_LFE:
+ if(ch==6) return a52_resample_2F_2R_LFE_to_6_C;
+ break;
+ case A52_3F2R | A52_LFE:
+ if(ch==6) return a52_resample_3F_2R_LFE_to_6_C;
+ break;
+ }
+ return NULL;
+}
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