/**
- * @file vorbis.c
+ * @file libavcodec/vorbis.c
* 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
#define ALT_BITSTREAM_READER_LE
#include "avcodec.h"
-#include "bitstream.h"
+#include "get_bits.h"
#include "vorbis.h"
/* Helper functions */
-unsigned int ff_vorbis_nth_root(unsigned int x, unsigned int n) { // x^(1/n)
- unsigned int ret=0, i, j;
+// x^(1/n)
+unsigned int ff_vorbis_nth_root(unsigned int x, unsigned int n)
+{
+ unsigned int ret = 0, i, j;
do {
++ret;
- for(i=0,j=ret;i<n-1;i++) j*=ret;
- } while (j<=x);
+ for (i = 0, j = ret; i < n - 1; i++)
+ j *= ret;
+ } while (j <= x);
return ret - 1;
}
// Generate vlc codes from vorbis huffman code lengths
-int ff_vorbis_len2vlc(uint8_t *bits, uint32_t *codes, uint_fast32_t num) {
- uint_fast32_t exit_at_level[33]={404,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
- 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
+// the two bits[p] > 32 checks should be redundant, all calling code should
+// already ensure that, but since it allows overwriting the stack it seems
+// reasonable to check redundantly.
+int ff_vorbis_len2vlc(uint8_t *bits, uint32_t *codes, uint_fast32_t num)
+{
+ uint_fast32_t exit_at_level[33] = {
+ 404, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
- uint_fast8_t i,j;
- uint_fast32_t code,p;
+ uint_fast8_t i, j;
+ uint_fast32_t code, p;
#ifdef V_DEBUG
GetBitContext gb;
#endif
- for(p=0;(bits[p]==0) && (p<num);++p);
- if (p==num) {
+ for (p = 0; (bits[p] == 0) && (p < num); ++p)
+ ;
+ if (p == num) {
// av_log(vc->avccontext, AV_LOG_INFO, "An empty codebook. Heh?! \n");
return 0;
}
- codes[p]=0;
- for(i=0;i<bits[p];++i) {
- exit_at_level[i+1]=1<<i;
- }
+ codes[p] = 0;
+ if (bits[p] > 32)
+ return 1;
+ for (i = 0; i < bits[p]; ++i)
+ exit_at_level[i+1] = 1 << i;
#ifdef V_DEBUG
av_log(NULL, AV_LOG_INFO, " %d. of %d code len %d code %d - ", p, num, bits[p], codes[p]);
init_get_bits(&gb, (uint_fast8_t *)&codes[p], bits[p]);
- for(i=0;i<bits[p];++i) {
+ for (i = 0; i < bits[p]; ++i)
av_log(NULL, AV_LOG_INFO, "%s", get_bits1(&gb) ? "1" : "0");
- }
av_log(NULL, AV_LOG_INFO, "\n");
#endif
++p;
- for(;p<num;++p) {
- if (bits[p]==0) continue;
+ for (; p < num; ++p) {
+ if (bits[p] > 32)
+ return 1;
+ if (bits[p] == 0)
+ continue;
// find corresponding exit(node which the tree can grow further from)
- for(i=bits[p];i>0;--i) {
- if (exit_at_level[i]) break;
- }
- if (!i) return 1; // overspecified tree
- code=exit_at_level[i];
- exit_at_level[i]=0;
+ for (i = bits[p]; i > 0; --i)
+ if (exit_at_level[i])
+ break;
+ if (!i) // overspecified tree
+ return 1;
+ code = exit_at_level[i];
+ exit_at_level[i] = 0;
// construct code (append 0s to end) and introduce new exits
- for(j=i+1;j<=bits[p];++j) {
- exit_at_level[j]=code+(1<<(j-1));
- }
- codes[p]=code;
+ for (j = i + 1 ;j <= bits[p]; ++j)
+ exit_at_level[j] = code + (1 << (j - 1));
+ codes[p] = code;
#ifdef V_DEBUG
av_log(NULL, AV_LOG_INFO, " %d. code len %d code %d - ", p, bits[p], codes[p]);
init_get_bits(&gb, (uint_fast8_t *)&codes[p], bits[p]);
- for(i=0;i<bits[p];++i) {
+ for (i = 0; i < bits[p]; ++i)
av_log(NULL, AV_LOG_INFO, "%s", get_bits1(&gb) ? "1" : "0");
- }
av_log(NULL, AV_LOG_INFO, "\n");
#endif
}
//no exits should be left (underspecified tree - ie. unused valid vlcs - not allowed by SPEC)
- for (p=1; p<33; p++)
- if (exit_at_level[p]) return 1;
+ for (p = 1; p < 33; p++)
+ if (exit_at_level[p])
+ return 1;
return 0;
}
-void ff_vorbis_ready_floor1_list(floor1_entry_t * list, int values) {
+void ff_vorbis_ready_floor1_list(vorbis_floor1_entry * list, int values)
+{
int i;
list[0].sort = 0;
list[1].sort = 1;
for (i = 2; i < values; i++) {
int j;
- list[i].low = 0;
+ list[i].low = 0;
list[i].high = 1;
list[i].sort = i;
for (j = 2; j < i; j++) {
int tmp = list[j].x;
if (tmp < list[i].x) {
- if (tmp > list[list[i].low].x) list[i].low = j;
+ if (tmp > list[list[i].low].x)
+ list[i].low = j;
} else {
- if (tmp < list[list[i].high].x) list[i].high = j;
+ if (tmp < list[list[i].high].x)
+ list[i].high = j;
}
}
}
}
}
-static void render_line(int x0, int y0, int x1, int y1, float * buf) {
- int dy = y1 - y0;
- int adx = x1 - x0;
- int base = dy / adx;
- int ady = FFABS(dy) - FFABS(base) * adx;
- int x = x0;
- int y = y0;
- int err = 0;
- int sy = dy<0 ? -1 : 1;
- buf[x] = ff_vorbis_floor1_inverse_db_table[y];
- while (++x < x1) {
+static inline void render_line_unrolled(intptr_t x, intptr_t y, int x1,
+ intptr_t sy, int ady, int adx,
+ float *buf)
+{
+ int err = -adx;
+ x -= x1 - 1;
+ buf += x1 - 1;
+ while (++x < 0) {
err += ady;
- if (err >= adx) {
- err -= adx;
- y += sy;
+ if (err >= 0) {
+ err += ady - adx;
+ y += sy;
+ buf[x++] = ff_vorbis_floor1_inverse_db_table[y];
}
- y += base;
buf[x] = ff_vorbis_floor1_inverse_db_table[y];
}
+ if (x <= 0) {
+ if (err + ady >= 0)
+ y += sy;
+ buf[x] = ff_vorbis_floor1_inverse_db_table[y];
+ }
+}
+
+static void render_line(int x0, int y0, int x1, int y1, float *buf)
+{
+ int dy = y1 - y0;
+ int adx = x1 - x0;
+ int ady = FFABS(dy);
+ int sy = dy < 0 ? -1 : 1;
+ buf[x0] = ff_vorbis_floor1_inverse_db_table[y0];
+ if (ady*2 <= adx) { // optimized common case
+ render_line_unrolled(x0, y0, x1, sy, ady, adx, buf);
+ } else {
+ int base = dy / adx;
+ int x = x0;
+ int y = y0;
+ int err = -adx;
+ ady -= FFABS(base) * adx;
+ while (++x < x1) {
+ y += base;
+ err += ady;
+ if (err >= 0) {
+ err -= adx;
+ y += sy;
+ }
+ buf[x] = ff_vorbis_floor1_inverse_db_table[y];
+ }
+ }
}
-void ff_vorbis_floor1_render_list(floor1_entry_t * list, int values, uint_fast16_t * y_list, int * flag, int multiplier, float * out, int samples) {
+void ff_vorbis_floor1_render_list(vorbis_floor1_entry * list, int values,
+ uint_fast16_t *y_list, int *flag,
+ int multiplier, float *out, int samples)
+{
int lx, ly, i;
lx = 0;
ly = y_list[0] * multiplier;
lx = x1;
ly = y1;
}
- if (lx >= samples) break;
+ if (lx >= samples)
+ break;
}
- if (lx < samples) render_line(lx, ly, samples, ly, out);
+ if (lx < samples)
+ render_line(lx, ly, samples, ly, out);
}
projects / ffmpeg / blobdiff