Separating from nellymoserdec.c parts required by encoder

Originally committed as revision 13713 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 6 insertions, 198 deletions

diff --git a/libavcodec/nellymoserdec.c b/libavcodec/nellymoserdec.c
index 876a44f022..07136b12e5 100644
--- a/libavcodec/nellymoserdec.c
+++ b/libavcodec/nellymoserdec.c
@@ -31,6 +31,7 @@
  * implementors. The original code is available from http://code.google.com/p/nelly2pcm/
  */
 
+#include "nellymoser.h"
 #include "libavutil/random.h"
 #include "avcodec.h"
 #include "dsputil.h"
@@ -38,57 +39,6 @@
 #define ALT_BITSTREAM_READER_LE
 #include "bitstream.h"
 
-#define NELLY_BANDS       23
-#define NELLY_BLOCK_LEN   64
-#define NELLY_HEADER_BITS 116
-#define NELLY_DETAIL_BITS 198
-#define NELLY_BUF_LEN     128
-#define NELLY_FILL_LEN    124
-#define NELLY_BIT_CAP     6
-#define NELLY_BASE_OFF    4228
-#define NELLY_BASE_SHIFT  19
-#define NELLY_SAMPLES     (2 * NELLY_BUF_LEN)
-
-static const float dequantization_table[127] = {
-0.0000000000,-0.8472560048, 0.7224709988, -1.5247479677, -0.4531480074, 0.3753609955, 1.4717899561,
--1.9822579622, -1.1929379702, -0.5829370022, -0.0693780035, 0.3909569979,0.9069200158, 1.4862740040,
- 2.2215409279, -2.3887870312, -1.8067539930, -1.4105420113, -1.0773609877, -0.7995010018,-0.5558109879,
--0.3334020078, -0.1324490011, 0.0568020009, 0.2548770010, 0.4773550034, 0.7386850119, 1.0443060398,
-1.3954459429, 1.8098750114, 2.3918759823,-2.3893830776, -1.9884680510, -1.7514040470, -1.5643119812,
--1.3922129869,-1.2164649963, -1.0469499826, -0.8905100226, -0.7645580173, -0.6454579830, -0.5259280205,
--0.4059549868, -0.3029719889, -0.2096900046, -0.1239869967, -0.0479229987, 0.0257730000, 0.1001340002,
-0.1737180054, 0.2585540116, 0.3522900045, 0.4569880068, 0.5767750144, 0.7003160119, 0.8425520062,
-1.0093879700, 1.1821349859, 1.3534560204, 1.5320819616, 1.7332619429, 1.9722349644, 2.3978140354,
--2.5756309032, -2.0573320389, -1.8984919786, -1.7727810144, -1.6662600040, -1.5742180347, -1.4993319511,
--1.4316639900, -1.3652280569, -1.3000990152, -1.2280930281, -1.1588579416, -1.0921250582, -1.0135740042,
--0.9202849865, -0.8287050128, -0.7374889851, -0.6447759867, -0.5590940118, -0.4857139885, -0.4110319912,
--0.3459700048, -0.2851159871, -0.2341620028, -0.1870580018, -0.1442500055, -0.1107169986, -0.0739680007,
--0.0365610011, -0.0073290002, 0.0203610007, 0.0479039997, 0.0751969963, 0.0980999991, 0.1220389977,
-0.1458999962, 0.1694349945, 0.1970459968, 0.2252430022, 0.2556869984, 0.2870100141, 0.3197099864,
-0.3525829911, 0.3889069855, 0.4334920049, 0.4769459963, 0.5204820037, 0.5644530058, 0.6122040153,
-0.6685929894, 0.7341650128, 0.8032159805, 0.8784040213, 0.9566209912, 1.0397069454, 1.1293770075,
-1.2211159468, 1.3080279827, 1.4024800062, 1.5056819916, 1.6227730513, 1.7724959850, 1.9430880547,
- 2.2903931141
-};
-
-static const uint8_t nelly_band_sizes_table[NELLY_BANDS] = {
-2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 4, 4, 5, 6, 6, 7, 8, 9, 10, 12, 14, 15
-};
-
-static const uint16_t nelly_init_table[64] = {
-3134, 5342, 6870, 7792, 8569, 9185, 9744, 10191, 10631, 11061, 11434, 11770,
-12116, 12513, 12925, 13300, 13674, 14027, 14352, 14716, 15117, 15477, 15824,
-16157, 16513, 16804, 17090, 17401, 17679, 17948, 18238, 18520, 18764, 19078,
-19381, 19640, 19921, 20205, 20500, 20813, 21162, 21465, 21794, 22137, 22453,
-22756, 23067, 23350, 23636, 23926, 24227, 24521, 24819, 25107, 25414, 25730,
-26120, 26497, 26895, 27344, 27877, 28463, 29426, 31355
-};
-
-static const int16_t nelly_delta_table[32] = {
--11725, -9420, -7910, -6801, -5948, -5233, -4599, -4039, -3507, -3030, -2596,
--2170, -1774, -1383, -1016, -660, -329, -1, 337, 696, 1085, 1512, 1962, 2433,
-2968, 3569, 4314, 5279, 6622, 8154, 10076, 12975
-};
 
 typedef struct NellyMoserDecodeContext {
     AVCodecContext* avctx;
@@ -106,13 +56,6 @@ typedef struct NellyMoserDecodeContext {
 
 static DECLARE_ALIGNED_16(float,sine_window[128]);
 
-static inline int signed_shift(int i, int shift) {
-    if (shift > 0)
-        return i << shift;
-    return i >> -shift;
-}
-
-
 static void overlap_and_window(NellyMoserDecodeContext *s, float *state, float *audio, float *a_in)
 {
     int bot, top;
@@ -130,141 +73,6 @@ static void overlap_and_window(NellyMoserDecodeContext *s, float *state, float *
     memcpy(state, a_in + NELLY_BUF_LEN, sizeof(float)*NELLY_BUF_LEN);
 }
 
-static int sum_bits(short *buf, short shift, short off)
-{
-    int i, ret = 0;
-
-    for (i = 0; i < NELLY_FILL_LEN; i++) {
-        int b = buf[i]-off;
-        b = ((b>>(shift-1))+1)>>1;
-        ret += av_clip(b, 0, NELLY_BIT_CAP);
-    }
-
-    return ret;
-}
-
-static int headroom(int *la)
-{
-    int l;
-    if (*la == 0) {
-        return 31;
-    }
-    l = 30 - av_log2(FFABS(*la));
-    *la <<= l;
-    return l;
-}
-
-
-static void get_sample_bits(const float *buf, int *bits)
-{
-    int i, j;
-    short sbuf[128];
-    int bitsum = 0, last_bitsum, small_bitsum, big_bitsum;
-    short shift, shift_saved;
-    int max, sum, last_off, tmp;
-    int big_off, small_off;
-    int off;
-
-    max = 0;
-    for (i = 0; i < NELLY_FILL_LEN; i++) {
-        max = FFMAX(max, buf[i]);
-    }
-    shift = -16;
-    shift += headroom(&max);
-
-    sum = 0;
-    for (i = 0; i < NELLY_FILL_LEN; i++) {
-        sbuf[i] = signed_shift(buf[i], shift);
-        sbuf[i] = (3*sbuf[i])>>2;
-        sum += sbuf[i];
-    }
-
-    shift += 11;
-    shift_saved = shift;
-    sum -= NELLY_DETAIL_BITS << shift;
-    shift += headroom(&sum);
-    small_off = (NELLY_BASE_OFF * (sum>>16)) >> 15;
-    shift = shift_saved - (NELLY_BASE_SHIFT+shift-31);
-
-    small_off = signed_shift(small_off, shift);
-
-    bitsum = sum_bits(sbuf, shift_saved, small_off);
-
-    if (bitsum != NELLY_DETAIL_BITS) {
-        shift = 0;
-        off = bitsum - NELLY_DETAIL_BITS;
-
-        for(shift=0; FFABS(off) <= 16383; shift++)
-            off *= 2;
-
-        off = (off * NELLY_BASE_OFF) >> 15;
-        shift = shift_saved-(NELLY_BASE_SHIFT+shift-15);
-
-        off = signed_shift(off, shift);
-
-        for (j = 1; j < 20; j++) {
-            last_off = small_off;
-            small_off += off;
-            last_bitsum = bitsum;
-
-            bitsum = sum_bits(sbuf, shift_saved, small_off);
-
-            if ((bitsum-NELLY_DETAIL_BITS) * (last_bitsum-NELLY_DETAIL_BITS) <= 0)
-                break;
-        }
-
-        if (bitsum > NELLY_DETAIL_BITS) {
-            big_off = small_off;
-            small_off = last_off;
-            big_bitsum=bitsum;
-            small_bitsum=last_bitsum;
-        } else {
-            big_off = last_off;
-            big_bitsum=last_bitsum;
-            small_bitsum=bitsum;
-        }
-
-        while (bitsum != NELLY_DETAIL_BITS && j <= 19) {
-            off = (big_off+small_off)>>1;
-            bitsum = sum_bits(sbuf, shift_saved, off);
-            if (bitsum > NELLY_DETAIL_BITS) {
-                big_off=off;
-                big_bitsum=bitsum;
-            } else {
-                small_off = off;
-                small_bitsum=bitsum;
-            }
-            j++;
-        }
-
-        if (abs(big_bitsum-NELLY_DETAIL_BITS) >=
-            abs(small_bitsum-NELLY_DETAIL_BITS)) {
-            bitsum = small_bitsum;
-        } else {
-            small_off = big_off;
-            bitsum = big_bitsum;
-        }
-    }
-
-    for (i = 0; i < NELLY_FILL_LEN; i++) {
-        tmp = sbuf[i]-small_off;
-        tmp = ((tmp>>(shift_saved-1))+1)>>1;
-        bits[i] = av_clip(tmp, 0, NELLY_BIT_CAP);
-    }
-
-    if (bitsum > NELLY_DETAIL_BITS) {
-        tmp = i = 0;
-        while (tmp < NELLY_DETAIL_BITS) {
-            tmp += bits[i];
-            i++;
-        }
-
-        bits[i-1] -= tmp - NELLY_DETAIL_BITS;
-        for(; i < NELLY_FILL_LEN; i++)
-            bits[i] = 0;
-    }
-}
-
 static void nelly_decode_block(NellyMoserDecodeContext *s,
                                const unsigned char block[NELLY_BLOCK_LEN],
                                float audio[NELLY_SAMPLES])
@@ -279,19 +87,19 @@ static void nelly_decode_block(NellyMoserDecodeContext *s,
 
     bptr = buf;
     pptr = pows;
-    val = nelly_init_table[get_bits(&s->gb, 6)];
+    val = ff_nelly_init_table[get_bits(&s->gb, 6)];
     for (i=0 ; i<NELLY_BANDS ; i++) {
         if (i > 0)
-            val += nelly_delta_table[get_bits(&s->gb, 5)];
+            val += ff_nelly_delta_table[get_bits(&s->gb, 5)];
         pval = -pow(2, val/2048) * s->scale_bias;
-        for (j = 0; j < nelly_band_sizes_table[i]; j++) {
+        for (j = 0; j < ff_nelly_band_sizes_table[i]; j++) {
             *bptr++ = val;
             *pptr++ = pval;
         }
 
     }
 
-    get_sample_bits(buf, bits);
+    ff_nelly_get_sample_bits(buf, bits);
 
     for (i = 0; i < 2; i++) {
         aptr = audio + i * NELLY_BUF_LEN;
@@ -306,7 +114,7 @@ static void nelly_decode_block(NellyMoserDecodeContext *s,
                     aptr[j] *= -1.0;
             } else {
                 v = get_bits(&s->gb, bits[j]);
-                aptr[j] = dequantization_table[(1<<bits[j])-1+v]*pows[j];
+                aptr[j] = ff_nelly_dequantization_table[(1<<bits[j])-1+v]*pows[j];
             }
         }
         memset(&aptr[NELLY_FILL_LEN], 0,