make some more functions global so they can be shared with vorbis_enc.c

Originally committed as revision 6402 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 31 insertions, 0 deletions

diff --git a/libavcodec/vorbis.h b/libavcodec/vorbis.h
index 5cdcb652af..beb1aab8fe 100644
--- a/libavcodec/vorbis.h
+++ b/libavcodec/vorbis.h
@@ -30,5 +30,36 @@ typedef struct {
 } floor1_entry_t;
 
 void ff_vorbis_ready_floor1_list(floor1_entry_t * list, int values);
+unsigned int ff_vorbis_nth_root(unsigned int x, unsigned int n); // x^(1/n)
+int ff_vorbis_len2vlc(uint8_t *bits, uint32_t *codes, uint_fast32_t num);
+
+static void render_line(int x0, int y0, int x1, int y1, float * buf, int n) {
+    int dy = y1 - y0;
+    int adx = x1 - x0;
+    int ady = ABS(dy);
+    int base = dy / adx;
+    int x = x0;
+    int y = y0;
+    int err = 0;
+    int sy;
+    if (dy < 0) sy = base - 1;
+    else        sy = base + 1;
+    ady = ady - ABS(base) * adx;
+    if (x >= n) return;
+    buf[x] = ff_vorbis_floor1_inverse_db_table[y];
+    for (x = x0 + 1; x < x1; x++) {
+        if (x >= n) return;
+        err += ady;
+        if (err >= adx) {
+            err -= adx;
+            y += sy;
+        } else {
+            y += base;
+        }
+        buf[x] = ff_vorbis_floor1_inverse_db_table[y];
+    }
+}
+
+#define ilog(i) av_log2(2*(i))
 
 #endif