WavPack lossless audio decoder

Originally committed as revision 6336 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 548 insertions, 0 deletions

diff --git a/libavcodec/wavpack.c b/libavcodec/wavpack.c
new file mode 100644
index 0000000000..4a4a5847e9
--- /dev/null
+++ b/libavcodec/wavpack.c
@@ -0,0 +1,548 @@
+/*
+ * WavPack lossless audio decoder
+ * Copyright (c) 2006 Konstantin Shishkov
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+#define ALT_BITSTREAM_READER_LE
+#include "avcodec.h"
+#include "bitstream.h"
+
+/**
+ * @file wavpack.c
+ * WavPack lossless audio decoder
+ */
+
+#define WV_JOINT 0x0010
+
+enum WP_ID_Flags{
+    WP_IDF_MASK   = 0x1F,
+    WP_IDF_IGNORE = 0x20,
+    WP_IDF_ODD    = 0x40,
+    WP_IDF_LONG   = 0x80
+};
+
+enum WP_ID{
+    WP_ID_DUMMY = 0,
+    WP_ID_ENCINFO,
+    WP_ID_DECTERMS,
+    WP_ID_DECWEIGHTS,
+    WP_ID_DECSAMPLES,
+    WP_ID_ENTROPY,
+    WP_ID_HYBRID,
+    WP_ID_SHAPING,
+    WP_ID_FLOATINFO,
+    WP_ID_INT32INFO,
+    WP_ID_DATA,
+    WP_ID_CORR,
+    WP_ID_FLT,
+    WP_ID_CHANINFO
+};
+
+#define MAX_TERMS 16
+
+typedef struct Decorr {
+    int delta;
+    int value;
+    int weightA;
+    int weightB;
+    int samplesA[8];
+    int samplesB[8];
+} Decorr;
+
+typedef struct WavpackContext {
+    AVCodecContext *avctx;
+    int stereo;
+    int joint;
+    uint32_t CRC;
+    GetBitContext gb;
+    int data_size; // in bits
+    int samples;
+    int median[6];
+    int terms;
+    Decorr decorr[MAX_TERMS];
+    int zero, one, zeroes;
+} WavpackContext;
+
+// exponent table copied from WavPack source
+static const uint8_t wp_exp2_table [256] = {
+    0x00, 0x01, 0x01, 0x02, 0x03, 0x03, 0x04, 0x05, 0x06, 0x06, 0x07, 0x08, 0x08, 0x09, 0x0a, 0x0b,
+    0x0b, 0x0c, 0x0d, 0x0e, 0x0e, 0x0f, 0x10, 0x10, 0x11, 0x12, 0x13, 0x13, 0x14, 0x15, 0x16, 0x16,
+    0x17, 0x18, 0x19, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1d, 0x1e, 0x1f, 0x20, 0x20, 0x21, 0x22, 0x23,
+    0x24, 0x24, 0x25, 0x26, 0x27, 0x28, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2c, 0x2d, 0x2e, 0x2f, 0x30,
+    0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3a, 0x3b, 0x3c, 0x3d,
+    0x3e, 0x3f, 0x40, 0x41, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x48, 0x49, 0x4a, 0x4b,
+    0x4c, 0x4d, 0x4e, 0x4f, 0x50, 0x51, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a,
+    0x5b, 0x5c, 0x5d, 0x5e, 0x5e, 0x5f, 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,
+    0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,
+    0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x87, 0x88, 0x89, 0x8a,
+    0x8b, 0x8c, 0x8d, 0x8e, 0x8f, 0x90, 0x91, 0x92, 0x93, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b,
+    0x9c, 0x9d, 0x9f, 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad,
+    0xaf, 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xbc, 0xbd, 0xbe, 0xbf, 0xc0,
+    0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc8, 0xc9, 0xca, 0xcb, 0xcd, 0xce, 0xcf, 0xd0, 0xd2, 0xd3, 0xd4,
+    0xd6, 0xd7, 0xd8, 0xd9, 0xdb, 0xdc, 0xdd, 0xde, 0xe0, 0xe1, 0xe2, 0xe4, 0xe5, 0xe6, 0xe8, 0xe9,
+    0xea, 0xec, 0xed, 0xee, 0xf0, 0xf1, 0xf2, 0xf4, 0xf5, 0xf6, 0xf8, 0xf9, 0xfa, 0xfc, 0xfd, 0xff
+};
+
+static always_inline int wp_exp2(int16_t val)
+{
+    int res, neg = 0;
+
+    if(val < 0){
+        val = -val;
+        neg = 1;
+    }
+
+    res = wp_exp2_table[val & 0xFF] | 0x100;
+    val >>= 8;
+    res = (val > 9) ? (res << (val - 9)) : (res >> (9 - val));
+    return neg ? -res : res;
+}
+
+static inline int get_unary(GetBitContext *gb){
+    int r=0;
+    while(get_bits1(gb) && r<33)r++;
+    return r;
+}
+
+// macros for manipulating median values
+#define GET_MED(n) ((median[n] >> 4) + 1)
+#define DEC_MED(n) median[n] -= ((median[n] + (128>>n) - 2) / (128>>n)) * 2
+#define INC_MED(n) median[n] += ((median[n] + (128>>n)) / (128>>n)) * 5
+
+// macros for applying weight
+#define UPDATE_WEIGHT_CLIP(weight, delta, samples, in) \
+        if(samples && in){ \
+            if((samples ^ in) < 0){ \
+                weight -= delta; \
+                if(weight < -1024) weight = -1024; \
+            }else{ \
+                weight += delta; \
+                if(weight > 1024) weight = 1024; \
+            } \
+        }
+
+
+static always_inline int get_tail(GetBitContext *gb, int k)
+{
+    int p, e, res;
+
+    if(k<1 || k>65535)return 0;
+    p = av_log2_16bit(k);
+    e = (1 << (p + 1)) - k - 1;
+    res = get_bits(gb, p);
+    if(res >= e){
+        res = (res<<1) - e + get_bits1(gb);
+    }
+    return res;
+}
+
+static int wv_get_value(WavpackContext *ctx, GetBitContext *gb, int *median, int *last)
+{
+    int t, t2;
+    int sign, base, add, ret;
+
+    *last = 0;
+
+    if((ctx->median[0] < 2U) && (ctx->median[3] < 2U) && !ctx->zero && !ctx->one){
+        if(ctx->zeroes){
+            ctx->zeroes--;
+            if(ctx->zeroes)
+                return 0;
+        }else{
+            t = get_unary(gb);
+            if(t >= 2) t = get_bits(gb, t - 1) | (1 << (t-1));
+            ctx->zeroes = t;
+            if(ctx->zeroes){
+                memset(ctx->median, 0, sizeof(ctx->median));
+                return 0;
+            }
+        }
+    }
+
+    if(get_bits_count(gb) >= ctx->data_size){
+        *last = 1;
+        return 0;
+    }
+
+    if(ctx->zero){
+        t = 0;
+        ctx->zero = 0;
+    }else{
+        t = get_unary(gb);
+        if(get_bits_count(gb) >= ctx->data_size){
+            *last = 1;
+            return 0;
+        }
+        if(t == 16) {
+            t2 = get_unary(gb);
+            if(t2 < 2) t += t2;
+            else t += get_bits(gb, t2 - 1) | (1 << (t2 - 1));
+        }
+
+        if(ctx->one){
+            ctx->one = t&1;
+            t = (t>>1) + 1;
+        }else{
+            ctx->one = t&1;
+            t >>= 1;
+        }
+        ctx->zero = !ctx->one;
+    }
+
+    if(!t){
+        base = 0;
+        add = GET_MED(0) - 1;
+        DEC_MED(0);
+    }else if(t == 1){
+        base = GET_MED(0);
+        add = GET_MED(1) - 1;
+        INC_MED(0);
+        DEC_MED(1);
+    }else if(t == 2){
+        base = GET_MED(0) + GET_MED(1);
+        add = GET_MED(2) - 1;
+        INC_MED(0);
+        INC_MED(1);
+        DEC_MED(2);
+    }else{
+        base = GET_MED(0) + GET_MED(1) + GET_MED(2) * (t - 2);
+        add = GET_MED(2) - 1;
+        INC_MED(0);
+        INC_MED(1);
+        INC_MED(2);
+    }
+    ret = base + get_tail(gb, add);
+    sign = get_bits1(gb);
+    return sign ? ~ret : ret;
+}
+
+static int wv_unpack_stereo(WavpackContext *s, GetBitContext *gb, int16_t *dst)
+{
+    int i, j, count = 0;
+    int last, t;
+    int A, B, L, L2, R, R2;
+    int pos = 0;
+    uint32_t crc = 0xFFFFFFFF;
+
+    s->one = s->zero = s->zeroes = 0;
+    do{
+        L = wv_get_value(s, gb, s->median, &last);
+        if(last) break;
+        R = wv_get_value(s, gb, s->median + 3, &last);
+        if(last) break;
+        for(i = 0; i < s->terms; i++){
+            t = s->decorr[i].value;
+            j = 0;
+            if(t > 0){
+                if(t > 8){
+                    if(t & 1){
+                        A = 2 * s->decorr[i].samplesA[0] - s->decorr[i].samplesA[1];
+                        B = 2 * s->decorr[i].samplesB[0] - s->decorr[i].samplesB[1];
+                    }else{
+                        A = (3 * s->decorr[i].samplesA[0] - s->decorr[i].samplesA[1]) >> 1;
+                        B = (3 * s->decorr[i].samplesB[0] - s->decorr[i].samplesB[1]) >> 1;
+                    }
+                    s->decorr[i].samplesA[1] = s->decorr[i].samplesA[0];
+                    s->decorr[i].samplesB[1] = s->decorr[i].samplesB[0];
+                    j = 0;
+                }else{
+                    A = s->decorr[i].samplesA[pos];
+                    B = s->decorr[i].samplesB[pos];
+                    j = (pos + t) & 7;
+                }
+                L2 = L + ((s->decorr[i].weightA * A + 512) >> 10);
+                R2 = R + ((s->decorr[i].weightB * B + 512) >> 10);
+                if(A && L) s->decorr[i].weightA -= ((((L ^ A) >> 30) & 2) - 1) * s->decorr[i].delta;
+                if(B && R) s->decorr[i].weightB -= ((((R ^ B) >> 30) & 2) - 1) * s->decorr[i].delta;
+                s->decorr[i].samplesA[j] = L = L2;
+                s->decorr[i].samplesB[j] = R = R2;
+            }else if(t == -1){
+                L2 = L + ((s->decorr[i].weightA * s->decorr[i].samplesA[0] + 512) >> 10);
+                UPDATE_WEIGHT_CLIP(s->decorr[i].weightA, s->decorr[i].delta, s->decorr[i].samplesA[0], L);
+                L = L2;
+                R2 = R + ((s->decorr[i].weightB * L2 + 512) >> 10);
+                UPDATE_WEIGHT_CLIP(s->decorr[i].weightB, s->decorr[i].delta, L2, R);
+                R = R2;
+                s->decorr[i].samplesA[0] = R;
+            }else{
+                R2 = R + ((s->decorr[i].weightB * s->decorr[i].samplesB[0] + 512) >> 10);
+                UPDATE_WEIGHT_CLIP(s->decorr[i].weightB, s->decorr[i].delta, s->decorr[i].samplesB[0], R);
+                R = R2;
+
+                if(t == -3){
+                    R2 = s->decorr[i].samplesA[0];
+                    s->decorr[i].samplesA[0] = R;
+                }
+
+                L2 = L + ((s->decorr[i].weightA * R2 + 512) >> 10);
+                UPDATE_WEIGHT_CLIP(s->decorr[i].weightA, s->decorr[i].delta, R2, L);
+                L = L2;
+                s->decorr[i].samplesB[0] = L;
+            }
+        }
+        pos = (pos + 1) & 7;
+        if(s->joint)
+            L += (R -= (L >> 1));
+        crc = (crc * 3 + L) * 3 + R;
+        *dst++ = L;
+        *dst++ = R;
+
+        count++;
+    }while(!last && count < s->samples);
+
+    if(crc != s->CRC){
+        av_log(s->avctx, AV_LOG_ERROR, "CRC error\n");
+        return -1;
+    }
+    return count * 2;
+}
+
+static int wv_unpack_mono(WavpackContext *s, GetBitContext *gb, int16_t *dst)
+{
+    int i, j, count = 0;
+    int last, t;
+    int A, S, T;
+    int pos = 0;
+    uint32_t crc = 0xFFFFFFFF;
+
+    s->one = s->zero = s->zeroes = 0;
+    do{
+        T = wv_get_value(s, gb, s->median, &last);
+        S = 0;
+        if(last) break;
+        for(i = 0; i < s->terms; i++){
+            t = s->decorr[i].value;
+            if(t > 8){
+                if(t & 1)
+                    A = 2 * s->decorr[i].samplesA[0] - s->decorr[i].samplesA[1];
+                else
+                    A = (3 * s->decorr[i].samplesA[0] - s->decorr[i].samplesA[1]) >> 1;
+                s->decorr[i].samplesA[1] = s->decorr[i].samplesA[0];
+                j = 0;
+            }else{
+                A = s->decorr[i].samplesA[pos];
+                j = (pos + t) & 7;
+            }
+            S = T + ((s->decorr[i].weightA * A + 512) >> 10);
+            if(A && T) s->decorr[i].weightA -= ((((T ^ A) >> 30) & 2) - 1) * s->decorr[i].delta;
+            s->decorr[i].samplesA[j] = T = S;
+        }
+        pos = (pos + 1) & 7;
+        crc = crc * 3 + S;
+        *dst++ = S;
+        count++;
+    }while(!last && count < s->samples);
+
+    if(crc != s->CRC){
+        av_log(s->avctx, AV_LOG_ERROR, "CRC error\n");
+        return -1;
+    }
+    return count;
+}
+
+static int wavpack_decode_init(AVCodecContext *avctx)
+{
+    WavpackContext *s = avctx->priv_data;
+
+    s->avctx = avctx;
+    s->stereo = (avctx->channels == 2);
+
+    return 0;
+}
+
+static int wavpack_decode_close(AVCodecContext *avctx)
+{
+//    WavpackContext *s = avctx->priv_data;
+
+    return 0;
+}
+
+static int wavpack_decode_frame(AVCodecContext *avctx,
+                            void *data, int *data_size,
+                            uint8_t *buf, int buf_size)
+{
+    WavpackContext *s = avctx->priv_data;
+    int16_t *samples = data;
+    int samplecount;
+    int got_terms = 0, got_weights = 0, got_samples = 0, got_entropy = 0, got_bs = 0;
+    uint8_t* buf_end = buf + buf_size;
+    int i, j, id, size, ssize, weights, t;
+
+    if (buf_size == 0) return 0;
+
+    memset(s->decorr, 0, MAX_TERMS * sizeof(Decorr));
+
+    s->samples = LE_32(buf); buf += 4;
+    s->joint = LE_32(buf) & WV_JOINT; buf += 4;
+    s->CRC = LE_32(buf); buf += 4;
+    // parse metadata blocks
+    while(buf < buf_end){
+        id = *buf++;
+        size = *buf++;
+        if(id & WP_IDF_LONG) {
+            size |= (*buf++) << 8;
+            size |= (*buf++) << 16;
+        }
+        size <<= 1; // size is specified in words
+        ssize = size;
+        if(id & WP_IDF_ODD) size--;
+        if(size < 0){
+            av_log(avctx, AV_LOG_ERROR, "Got incorrect block %02X with size %i\n", id, size);
+            break;
+        }
+        if(buf + ssize > buf_end){
+            av_log(avctx, AV_LOG_ERROR, "Block size %i is out of bounds\n", size);
+            break;
+        }
+        if(id & WP_IDF_IGNORE){
+            buf += ssize;
+            continue;
+        }
+        switch(id & WP_IDF_MASK){
+        case WP_ID_DECTERMS:
+            s->terms = size;
+            if(s->terms > MAX_TERMS){
+                av_log(avctx, AV_LOG_ERROR, "Too many decorrelation terms\n");
+                buf += ssize;
+                continue;
+            }
+            for(i = 0; i < s->terms; i++) {
+                s->decorr[s->terms - i - 1].value = (*buf & 0x1F) - 5;
+                s->decorr[s->terms - i - 1].delta = *buf >> 5;
+                buf++;
+            }
+            got_terms = 1;
+            break;
+        case WP_ID_DECWEIGHTS:
+            if(!got_terms){
+                av_log(avctx, AV_LOG_ERROR, "No decorrelation terms met\n");
+                continue;
+            }
+            weights = size >> s->stereo;
+            if(weights > MAX_TERMS || weights > s->terms){
+                av_log(avctx, AV_LOG_ERROR, "Too many decorrelation weights\n");
+                buf += ssize;
+                continue;
+            }
+            for(i = 0; i < weights; i++) {
+                t = (int8_t)(*buf++);
+                s->decorr[s->terms - i - 1].weightA = t << 3;
+                if(s->decorr[s->terms - i - 1].weightA > 0)
+                    s->decorr[s->terms - i - 1].weightA += (s->decorr[s->terms - i - 1].weightA + 64) >> 7;
+                if(s->stereo){
+                    t = (int8_t)(*buf++);
+                    s->decorr[s->terms - i - 1].weightB = t << 3;
+                    if(s->decorr[s->terms - i - 1].weightB > 0)
+                        s->decorr[s->terms - i - 1].weightB += (s->decorr[s->terms - i - 1].weightB + 64) >> 7;
+                }
+            }
+            got_weights = 1;
+            break;
+        case WP_ID_DECSAMPLES:
+            if(!got_terms){
+                av_log(avctx, AV_LOG_ERROR, "No decorrelation terms met\n");
+                continue;
+            }
+            t = 0;
+            for(i = s->terms - 1; (i >= 0) && (t < size); i--) {
+                if(s->decorr[i].value > 8){
+                    s->decorr[i].samplesA[0] = wp_exp2(LE_16(buf)); buf += 2;
+                    s->decorr[i].samplesA[1] = wp_exp2(LE_16(buf)); buf += 2;
+                    if(s->stereo){
+                        s->decorr[i].samplesB[0] = wp_exp2(LE_16(buf)); buf += 2;
+                        s->decorr[i].samplesB[1] = wp_exp2(LE_16(buf)); buf += 2;
+                        t += 4;
+                    }
+                    t += 4;
+                }else if(s->decorr[i].value < 0){
+                    s->decorr[i].samplesA[0] = wp_exp2(LE_16(buf)); buf += 2;
+                    s->decorr[i].samplesB[0] = wp_exp2(LE_16(buf)); buf += 2;
+                    t += 4;
+                }else{
+                    for(j = 0; j < s->decorr[i].value; j++){
+                        s->decorr[i].samplesA[j] = wp_exp2(LE_16(buf)); buf += 2;
+                        if(s->stereo){
+                            s->decorr[i].samplesB[j] = wp_exp2(LE_16(buf)); buf += 2;
+                        }
+                    }
+                    t += s->decorr[i].value * 2 * avctx->channels;
+                }
+            }
+            got_samples = 1;
+            break;
+        case WP_ID_ENTROPY:
+            if(size != 6 * avctx->channels){
+                av_log(avctx, AV_LOG_ERROR, "Entropy vars size should be %i, got %i", 6 * avctx->channels, size);
+                buf += ssize;
+                continue;
+            }
+            for(i = 0; i < 3 * avctx->channels; i++){
+                s->median[i] = wp_exp2(LE_16(buf));
+                buf += 2;
+            }
+            got_entropy = 1;
+            break;
+        case WP_ID_DATA:
+            init_get_bits(&s->gb, buf, size * 8);
+            s->data_size = size * 8;
+            buf += size;
+            got_bs = 1;
+            break;
+        default:
+            buf += size;
+        }
+        if(id & WP_IDF_ODD) buf++;
+    }
+    if(!got_terms){
+        av_log(avctx, AV_LOG_ERROR, "No block with decorrelation terms\n");
+        return -1;
+    }
+    if(!got_weights){
+        av_log(avctx, AV_LOG_ERROR, "No block with decorrelation weights\n");
+        return -1;
+    }
+    if(!got_samples){
+        av_log(avctx, AV_LOG_ERROR, "No block with decorrelation samples\n");
+        return -1;
+    }
+    if(!got_entropy){
+        av_log(avctx, AV_LOG_ERROR, "No block with entropy info\n");
+        return -1;
+    }
+    if(!got_bs){
+        av_log(avctx, AV_LOG_ERROR, "Packed samples not found\n");
+        return -1;
+    }
+
+    if(s->stereo)
+        samplecount = wv_unpack_stereo(s, &s->gb, samples);
+    else
+        samplecount = wv_unpack_mono(s, &s->gb, samples);
+    *data_size = samplecount * 2;
+
+    return buf_size;
+}
+
+AVCodec wavpack_decoder = {
+    "wavpack",
+    CODEC_TYPE_AUDIO,
+    CODEC_ID_WAVPACK,
+    sizeof(WavpackContext),
+    wavpack_decode_init,
+    NULL,
+    wavpack_decode_close,
+    wavpack_decode_frame,
+};