diff options
Diffstat (limited to 'libavcodec/vorbis.h')
-rw-r--r-- | libavcodec/vorbis.h | 31 |
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 |