1 files changed, 140 insertions, 0 deletions

diff --git a/lib/rbcodec/codecs/libtremor/ffmpeg_stuff.h b/lib/rbcodec/codecs/libtremor/ffmpeg_stuff.h
new file mode 100644
index 0000000000..d7fa846507
--- /dev/null
+++ b/lib/rbcodec/codecs/libtremor/ffmpeg_stuff.h
@@ -0,0 +1,140 @@
+/**
+ * @file
+ * Common code for Vorbis I encoder and decoder
+ * @author Denes Balatoni  ( dbalatoni programozo hu )
+ *
+ * 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
+ */
+
+/* render_line and friend taken from ffmpeg (libavcodec/vorbis.c) */
+
+#include "misc.h"
+
+static inline void render_line_unrolled(int x, int y, int x1,
+                                        int sy, int ady, int adx,
+                                        const ogg_int32_t *lookup, ogg_int32_t *buf)
+{
+    int err = -adx;
+    x -= x1 - 1;
+    buf += x1 - 1;
+    while (++x < 0) {
+        err += ady;
+        if (err >= 0) {
+            err += ady - adx;
+            y   += sy;
+            buf[x] = MULT31_SHIFT15(buf[x],lookup[y]);
+            x++;
+        }
+        buf[x] = MULT31_SHIFT15(buf[x],lookup[y]);
+    }
+    if (x <= 0) {
+        if (err + ady >= 0)
+            y += sy;
+        buf[x] = MULT31_SHIFT15(buf[x],lookup[y]);
+    }
+}
+
+static inline void render_line(int x0, int y0, int x1, int y1,
+                               const ogg_int32_t *lookup, ogg_int32_t *buf)
+{
+    int dy  = y1 - y0;
+    int adx = x1 - x0;
+    int ady = abs(dy);
+    int sy  = dy < 0 ? -1 : 1;
+    buf[x0] = MULT31_SHIFT15(buf[x0],lookup[y0]);
+    if (ady*2 <= adx) { // optimized common case
+        render_line_unrolled(x0, y0, x1, sy, ady, adx, lookup, buf);
+    } else {
+        int base = dy / adx;
+        int x    = x0;
+        int y    = y0;
+        int err  = -adx;
+        ady -= abs(base) * adx;
+        while (++x < x1) {
+            y += base;
+            err += ady;
+            if (err >= 0) {
+                err -= adx;
+                y   += sy;
+            }
+            buf[x] = MULT31_SHIFT15(buf[x],lookup[y]);
+        }
+    }
+}
+
+#ifndef INCL_OPTIMIZED_VECTOR_FMUL_WINDOW
+#define INCL_OPTIMIZED_VECTOR_FMUL_WINDOW
+static inline void ff_vector_fmul_window_c(ogg_int32_t *dst, const ogg_int32_t *src0,
+                                           const ogg_int32_t *src1, const ogg_int32_t *win, int len){
+    int i,j;
+    dst += len;
+    win += len;
+    src0+= len;
+    for(i=-len, j=len-1; i<0; i++, j--) {
+        ogg_int32_t s0 = src0[i];
+        ogg_int32_t s1 = src1[j];
+        ogg_int32_t wi = win[i];
+        ogg_int32_t wj = win[j];
+        XNPROD31(s0, s1, wj, wi, &dst[i], &dst[j]);
+        /*
+        dst[i] = MULT31(s0,wj) - MULT31(s1,wi);
+        dst[j] = MULT31(s0,wi) + MULT31(s1,wj);
+        */
+    }
+}
+#endif
+
+static inline void copy_normalize(ogg_int32_t *dst, ogg_int32_t *src, int len)
+{
+    memcpy(dst, src, len * sizeof(ogg_int32_t));
+}
+
+static inline void window_overlap_add(unsigned int blocksize, unsigned int lastblock,
+                                      unsigned int bs0, unsigned int bs1, int ch,
+                                      const ogg_int32_t *win, vorbis_dsp_state *v)
+{
+    unsigned retlen = (blocksize + lastblock) / 4;
+    int j;
+    for (j = 0; j < ch; j++) {
+        ogg_int32_t *residue = v->residues[v->ri] + j * blocksize / 2;
+        ogg_int32_t   *saved = v->saved_ptr[j];
+        ogg_int32_t     *ret = v->floors + j * retlen;
+        ogg_int32_t     *buf = residue;
+
+        if (v->W == v->lW) {
+            ff_vector_fmul_window_c(ret, saved, buf, win, blocksize / 4);
+        } else if (v->W > v->lW) {
+            ff_vector_fmul_window_c(ret, saved, buf, win, bs0 / 4);
+            copy_normalize(ret+bs0/2, buf+bs0/4, (bs1-bs0)/4);
+        } else {
+            copy_normalize(ret, saved, (bs1 - bs0) / 4);
+            ff_vector_fmul_window_c(ret + (bs1 - bs0) / 4, saved + (bs1 - bs0) / 4, buf, win, bs0 / 4);
+        }
+        if (v->residues[1] == NULL) {
+            memcpy(saved, buf + blocksize / 4, blocksize / 4 * sizeof(ogg_int32_t));
+            v->saved_ptr[j] = v->saved + j * bs1 / 4;
+        } else {
+            v->saved_ptr[j] = buf + blocksize / 4;
+        }
+
+        v->pcmb[j] = ret;
+    }
+
+    if (v->residues[1] != NULL) {
+      v->ri ^= 1;
+    }
+}