mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-21 10:55:51 +02:00
Remove common code from AC-3 encoder and utilize ac3.c.
Originally committed as revision 8306 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Justin Ruggles
parent
96ae7f11e7
commit
4258a0a32a
@ -47,7 +47,7 @@ OBJS= bitstream.o \
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HEADERS = avcodec.h opt.h
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OBJS-$(CONFIG_AASC_DECODER) += aasc.o
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OBJS-$(CONFIG_AC3_ENCODER) += ac3enc.o
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OBJS-$(CONFIG_AC3_ENCODER) += ac3enc.o ac3.o
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OBJS-$(CONFIG_ALAC_DECODER) += alac.o
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OBJS-$(CONFIG_ASV1_DECODER) += asv1.o
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OBJS-$(CONFIG_ASV1_ENCODER) += asv1.o
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@ -45,17 +45,15 @@ typedef struct AC3BitAllocParameters {
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int cplfleak, cplsleak;
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} AC3BitAllocParameters;
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#if 0
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extern const uint16_t ac3_freqs[3];
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extern const uint16_t ac3_bitratetab[19];
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extern const int16_t ac3_window[256];
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extern const uint8_t sdecaytab[4];
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extern const uint8_t fdecaytab[4];
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extern const uint16_t sgaintab[4];
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extern const uint16_t dbkneetab[4];
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extern const uint16_t floortab[8];
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extern const uint16_t fgaintab[8];
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#endif
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extern const uint16_t ff_ac3_freqs[3];
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extern const uint16_t ff_ac3_bitratetab[19];
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extern const int16_t ff_ac3_window[256];
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extern const uint8_t ff_sdecaytab[4];
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extern const uint8_t ff_fdecaytab[4];
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extern const uint16_t ff_sgaintab[4];
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extern const uint16_t ff_dbkneetab[4];
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extern const int16_t ff_floortab[8];
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extern const uint16_t ff_fgaintab[8];
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void ac3_common_init(void);
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void ac3_parametric_bit_allocation(AC3BitAllocParameters *s, uint8_t *bap,
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@ -62,7 +62,11 @@ typedef struct AC3EncodeContext {
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int mant1_cnt, mant2_cnt, mant4_cnt;
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} AC3EncodeContext;
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#include "ac3tab.h"
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static int16_t costab[64];
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static int16_t sintab[64];
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static int16_t fft_rev[512];
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static int16_t xcos1[128];
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static int16_t xsin1[128];
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#define MDCT_NBITS 9
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#define N (1 << MDCT_NBITS)
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@ -83,159 +87,6 @@ static inline int16_t fix15(float a)
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return v;
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}
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static inline int calc_lowcomp1(int a, int b0, int b1, int c)
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{
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if ((b0 + 256) == b1) {
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a = c;
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} else if (b0 > b1) {
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a = FFMAX(a - 64, 0);
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}
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return a;
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}
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static inline int calc_lowcomp(int a, int b0, int b1, int bin)
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{
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if (bin < 7) {
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return calc_lowcomp1(a, b0, b1, 384);
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} else if (bin < 20) {
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return calc_lowcomp1(a, b0, b1, 320);
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} else {
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return FFMAX(a - 128, 0);
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}
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}
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/* AC3 bit allocation. The algorithm is the one described in the AC3
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spec. */
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void ac3_parametric_bit_allocation(AC3BitAllocParameters *s, uint8_t *bap,
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int8_t *exp, int start, int end,
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int snroffset, int fgain, int is_lfe,
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int deltbae,int deltnseg,
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uint8_t *deltoffst, uint8_t *deltlen, uint8_t *deltba)
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{
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int bin,i,j,k,end1,v,bndstrt,bndend,lowcomp,begin;
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int fastleak,slowleak,address,tmp;
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int16_t psd[256]; /* scaled exponents */
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int16_t bndpsd[50]; /* interpolated exponents */
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int16_t excite[50]; /* excitation */
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int16_t mask[50]; /* masking value */
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/* exponent mapping to PSD */
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for(bin=start;bin<end;bin++) {
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psd[bin]=(3072 - (exp[bin] << 7));
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}
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/* PSD integration */
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j=start;
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k=masktab[start];
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do {
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v=psd[j];
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j++;
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end1 = FFMIN(bndtab[k+1], end);
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for(i=j;i<end1;i++) {
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/* logadd */
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int adr = FFMIN(FFABS(v - psd[j]) >> 1, 255);
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v = FFMAX(v, psd[j]) + latab[adr];
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j++;
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}
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bndpsd[k]=v;
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k++;
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} while (end > bndtab[k]);
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/* excitation function */
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bndstrt = masktab[start];
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bndend = masktab[end-1] + 1;
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if (bndstrt == 0) {
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lowcomp = 0;
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lowcomp = calc_lowcomp1(lowcomp, bndpsd[0], bndpsd[1], 384);
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excite[0] = bndpsd[0] - fgain - lowcomp;
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lowcomp = calc_lowcomp1(lowcomp, bndpsd[1], bndpsd[2], 384);
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excite[1] = bndpsd[1] - fgain - lowcomp;
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begin = 7;
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for (bin = 2; bin < 7; bin++) {
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if (!(is_lfe && bin == 6))
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lowcomp = calc_lowcomp1(lowcomp, bndpsd[bin], bndpsd[bin+1], 384);
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fastleak = bndpsd[bin] - fgain;
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slowleak = bndpsd[bin] - s->sgain;
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excite[bin] = fastleak - lowcomp;
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if (!(is_lfe && bin == 6)) {
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if (bndpsd[bin] <= bndpsd[bin+1]) {
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begin = bin + 1;
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break;
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}
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}
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}
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end1=bndend;
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if (end1 > 22) end1=22;
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for (bin = begin; bin < end1; bin++) {
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if (!(is_lfe && bin == 6))
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lowcomp = calc_lowcomp(lowcomp, bndpsd[bin], bndpsd[bin+1], bin);
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fastleak = FFMAX(fastleak - s->fdecay, bndpsd[bin] - fgain);
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slowleak = FFMAX(slowleak - s->sdecay, bndpsd[bin] - s->sgain);
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excite[bin] = FFMAX(fastleak - lowcomp, slowleak);
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}
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begin = 22;
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} else {
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/* coupling channel */
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begin = bndstrt;
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fastleak = (s->cplfleak << 8) + 768;
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slowleak = (s->cplsleak << 8) + 768;
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}
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for (bin = begin; bin < bndend; bin++) {
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fastleak = FFMAX(fastleak - s->fdecay, bndpsd[bin] - fgain);
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slowleak = FFMAX(slowleak - s->sdecay, bndpsd[bin] - s->sgain);
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excite[bin] = FFMAX(fastleak, slowleak);
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}
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/* compute masking curve */
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for (bin = bndstrt; bin < bndend; bin++) {
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tmp = s->dbknee - bndpsd[bin];
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if (tmp > 0) {
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excite[bin] += tmp >> 2;
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}
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mask[bin] = FFMAX(hth[bin >> s->halfratecod][s->fscod], excite[bin]);
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}
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/* delta bit allocation */
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if (deltbae == 0 || deltbae == 1) {
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int band, seg, delta;
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band = 0;
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for (seg = 0; seg < deltnseg; seg++) {
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band += deltoffst[seg];
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if (deltba[seg] >= 4) {
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delta = (deltba[seg] - 3) << 7;
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} else {
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delta = (deltba[seg] - 4) << 7;
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}
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for (k = 0; k < deltlen[seg]; k++) {
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mask[band] += delta;
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band++;
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}
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}
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}
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/* compute bit allocation */
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i = start;
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j = masktab[start];
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do {
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v = (FFMAX(mask[j] - snroffset - s->floor, 0) & 0x1FE0) + s->floor;
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end1 = FFMIN(bndtab[j] + bndsz[j], end);
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for (k = i; k < end1; k++) {
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address = av_clip((psd[i] - v) >> 5, 0, 63);
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bap[i] = baptab[address];
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i++;
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}
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} while (end > bndtab[j++]);
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}
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typedef struct IComplex {
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short re,im;
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} IComplex;
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@ -599,7 +450,7 @@ static int bit_alloc(AC3EncodeContext *s,
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0, s->nb_coefs[ch],
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(((csnroffst-15) << 4) +
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fsnroffst) << 2,
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fgaintab[s->fgaincod[ch]],
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ff_fgaintab[s->fgaincod[ch]],
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ch == s->lfe_channel,
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2, 0, NULL, NULL, NULL);
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frame_bits += compute_mantissa_size(s, bap[i][ch],
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@ -639,11 +490,11 @@ static int compute_bit_allocation(AC3EncodeContext *s,
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/* compute real values */
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s->bit_alloc.fscod = s->fscod;
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s->bit_alloc.halfratecod = s->halfratecod;
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s->bit_alloc.sdecay = sdecaytab[s->sdecaycod] >> s->halfratecod;
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s->bit_alloc.fdecay = fdecaytab[s->fdecaycod] >> s->halfratecod;
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s->bit_alloc.sgain = sgaintab[s->sgaincod];
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s->bit_alloc.dbknee = dbkneetab[s->dbkneecod];
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s->bit_alloc.floor = floortab[s->floorcod];
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s->bit_alloc.sdecay = ff_sdecaytab[s->sdecaycod] >> s->halfratecod;
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s->bit_alloc.fdecay = ff_fdecaytab[s->fdecaycod] >> s->halfratecod;
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s->bit_alloc.sgain = ff_sgaintab[s->sgaincod];
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s->bit_alloc.dbknee = ff_dbkneetab[s->dbkneecod];
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s->bit_alloc.floor = ff_floortab[s->floorcod];
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/* header size */
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frame_bits += 65;
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@ -741,22 +592,6 @@ static int compute_bit_allocation(AC3EncodeContext *s,
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return 0;
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}
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void ac3_common_init(void)
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{
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int i, j, k, l, v;
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/* compute bndtab and masktab from bandsz */
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k = 0;
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l = 0;
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for(i=0;i<50;i++) {
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bndtab[i] = l;
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v = bndsz[i];
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for(j=0;j<v;j++) masktab[k++]=i;
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l += v;
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}
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bndtab[50] = l;
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}
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static int AC3_encode_init(AVCodecContext *avctx)
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{
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int freq = avctx->sample_rate;
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@ -788,7 +623,7 @@ static int AC3_encode_init(AVCodecContext *avctx)
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/* frequency */
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for(i=0;i<3;i++) {
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for(j=0;j<3;j++)
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if ((ac3_freqs[j] >> i) == freq)
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if ((ff_ac3_freqs[j] >> i) == freq)
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goto found;
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}
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return -1;
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@ -802,7 +637,7 @@ static int AC3_encode_init(AVCodecContext *avctx)
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/* bitrate & frame size */
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bitrate /= 1000;
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for(i=0;i<19;i++) {
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if ((ac3_bitratetab[i] >> s->halfratecod) == bitrate)
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if ((ff_ac3_bitratetab[i] >> s->halfratecod) == bitrate)
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break;
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}
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if (i == 19)
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@ -1316,9 +1151,9 @@ static int AC3_encode_frame(AVCodecContext *avctx,
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/* apply the MDCT window */
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for(j=0;j<N/2;j++) {
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input_samples[j] = MUL16(input_samples[j],
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ac3_window[j]) >> 15;
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ff_ac3_window[j]) >> 15;
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input_samples[N-j-1] = MUL16(input_samples[N-j-1],
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ac3_window[j]) >> 15;
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ff_ac3_window[j]) >> 15;
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}
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/* Normalize the samples to use the maximum available
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@ -25,10 +25,10 @@
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*/
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/* possible frequencies */
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static const uint16_t ac3_freqs[3] = { 48000, 44100, 32000 };
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const uint16_t ff_ac3_freqs[3] = { 48000, 44100, 32000 };
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/* possible bitrates */
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static const uint16_t ac3_bitratetab[19] = {
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const uint16_t ff_ac3_bitratetab[19] = {
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32, 40, 48, 56, 64, 80, 96, 112, 128,
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160, 192, 224, 256, 320, 384, 448, 512, 576, 640
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};
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@ -36,7 +36,7 @@ static const uint16_t ac3_bitratetab[19] = {
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/* AC3 MDCT window */
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/* MDCT window */
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static const int16_t ac3_window[256] = {
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const int16_t ff_ac3_window[256] = {
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4, 7, 12, 16, 21, 28, 34, 42,
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51, 61, 72, 84, 97, 111, 127, 145,
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164, 184, 207, 231, 257, 285, 315, 347,
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@ -165,27 +165,27 @@ static const uint8_t baptab[64]= {
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15, 15, 15, 15,
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};
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static const uint8_t sdecaytab[4]={
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const uint8_t ff_sdecaytab[4]={
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0x0f, 0x11, 0x13, 0x15,
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};
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static const uint8_t fdecaytab[4]={
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const uint8_t ff_fdecaytab[4]={
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0x3f, 0x53, 0x67, 0x7b,
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};
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static const uint16_t sgaintab[4]= {
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const uint16_t ff_sgaintab[4]= {
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0x540, 0x4d8, 0x478, 0x410,
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};
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static const uint16_t dbkneetab[4]= {
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const uint16_t ff_dbkneetab[4]= {
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0x000, 0x700, 0x900, 0xb00,
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};
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static const int16_t floortab[8]= {
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const int16_t ff_floortab[8]= {
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0x2f0, 0x2b0, 0x270, 0x230, 0x1f0, 0x170, 0x0f0, 0xf800,
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};
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static const uint16_t fgaintab[8]= {
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const uint16_t ff_fgaintab[8]= {
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0x080, 0x100, 0x180, 0x200, 0x280, 0x300, 0x380, 0x400,
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};
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@ -196,10 +196,3 @@ static const uint8_t bndsz[50]={
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};
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static uint8_t bndtab[51];
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/* fft & mdct sin cos tables */
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static int16_t costab[64];
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static int16_t sintab[64];
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static int16_t fft_rev[512];
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static int16_t xcos1[128];
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static int16_t xsin1[128];
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