00001
00023 #undef V_DEBUG
00024
00025
00026 #define ALT_BITSTREAM_READER_LE
00027 #include "avcodec.h"
00028 #include "bitstream.h"
00029
00030 #include "vorbis.h"
00031
00032
00033
00034
00035 unsigned int ff_vorbis_nth_root(unsigned int x, unsigned int n) {
00036 unsigned int ret=0, i, j;
00037
00038 do {
00039 ++ret;
00040 for(i=0,j=ret;i<n-1;i++) j*=ret;
00041 } while (j<=x);
00042
00043 return ret - 1;
00044 }
00045
00046
00047
00048
00049
00050
00051 int ff_vorbis_len2vlc(uint8_t *bits, uint32_t *codes, uint_fast32_t num) {
00052 uint_fast32_t exit_at_level[33]={404,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
00053 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
00054
00055 uint_fast8_t i,j;
00056 uint_fast32_t code,p;
00057
00058 #ifdef V_DEBUG
00059 GetBitContext gb;
00060 #endif
00061
00062 for(p=0;(bits[p]==0) && (p<num);++p);
00063 if (p==num) {
00064
00065 return 0;
00066 }
00067
00068 codes[p]=0;
00069 if (bits[p] > 32) return 1;
00070 for(i=0;i<bits[p];++i) {
00071 exit_at_level[i+1]=1<<i;
00072 }
00073
00074 #ifdef V_DEBUG
00075 av_log(NULL, AV_LOG_INFO, " %d. of %d code len %d code %d - ", p, num, bits[p], codes[p]);
00076 init_get_bits(&gb, (uint_fast8_t *)&codes[p], bits[p]);
00077 for(i=0;i<bits[p];++i) {
00078 av_log(NULL, AV_LOG_INFO, "%s", get_bits1(&gb) ? "1" : "0");
00079 }
00080 av_log(NULL, AV_LOG_INFO, "\n");
00081 #endif
00082
00083 ++p;
00084
00085 for(;p<num;++p) {
00086 if (bits[p] > 32) return 1;
00087 if (bits[p]==0) continue;
00088
00089 for(i=bits[p];i>0;--i) {
00090 if (exit_at_level[i]) break;
00091 }
00092 if (!i) return 1;
00093 code=exit_at_level[i];
00094 exit_at_level[i]=0;
00095
00096 for(j=i+1;j<=bits[p];++j) {
00097 exit_at_level[j]=code+(1<<(j-1));
00098 }
00099 codes[p]=code;
00100
00101 #ifdef V_DEBUG
00102 av_log(NULL, AV_LOG_INFO, " %d. code len %d code %d - ", p, bits[p], codes[p]);
00103 init_get_bits(&gb, (uint_fast8_t *)&codes[p], bits[p]);
00104 for(i=0;i<bits[p];++i) {
00105 av_log(NULL, AV_LOG_INFO, "%s", get_bits1(&gb) ? "1" : "0");
00106 }
00107 av_log(NULL, AV_LOG_INFO, "\n");
00108 #endif
00109
00110 }
00111
00112
00113 for (p=1; p<33; p++)
00114 if (exit_at_level[p]) return 1;
00115
00116 return 0;
00117 }
00118
00119 void ff_vorbis_ready_floor1_list(vorbis_floor1_entry * list, int values) {
00120 int i;
00121 list[0].sort = 0;
00122 list[1].sort = 1;
00123 for (i = 2; i < values; i++) {
00124 int j;
00125 list[i].low = 0;
00126 list[i].high = 1;
00127 list[i].sort = i;
00128 for (j = 2; j < i; j++) {
00129 int tmp = list[j].x;
00130 if (tmp < list[i].x) {
00131 if (tmp > list[list[i].low].x) list[i].low = j;
00132 } else {
00133 if (tmp < list[list[i].high].x) list[i].high = j;
00134 }
00135 }
00136 }
00137 for (i = 0; i < values - 1; i++) {
00138 int j;
00139 for (j = i + 1; j < values; j++) {
00140 if (list[list[i].sort].x > list[list[j].sort].x) {
00141 int tmp = list[i].sort;
00142 list[i].sort = list[j].sort;
00143 list[j].sort = tmp;
00144 }
00145 }
00146 }
00147 }
00148
00149 static void render_line(int x0, uint8_t y0, int x1, int y1, float * buf) {
00150 int dy = y1 - y0;
00151 int adx = x1 - x0;
00152 int base = dy / adx;
00153 int ady = FFABS(dy) - FFABS(base) * adx;
00154 int x = x0;
00155 uint8_t y = y0;
00156 int err = 0;
00157 int sy = dy<0 ? -1 : 1;
00158 buf[x] = ff_vorbis_floor1_inverse_db_table[y];
00159 while (++x < x1) {
00160 err += ady;
00161 if (err >= adx) {
00162 err -= adx;
00163 y += sy;
00164 }
00165 y += base;
00166 buf[x] = ff_vorbis_floor1_inverse_db_table[y];
00167 }
00168 }
00169
00170 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) {
00171 int lx, i;
00172 uint8_t ly;
00173 lx = 0;
00174 ly = y_list[0] * multiplier;
00175 for (i = 1; i < values; i++) {
00176 int pos = list[i].sort;
00177 if (flag[pos]) {
00178 int x1 = list[pos].x;
00179 int y1 = y_list[pos] * multiplier;
00180 if (lx < samples)
00181 render_line(lx, ly, FFMIN(x1,samples), y1, out);
00182 lx = x1;
00183 ly = y1;
00184 }
00185 if (lx >= samples) break;
00186 }
00187 if (lx < samples) render_line(lx, ly, samples, ly, out);
00188 }