X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavcodec%2Fwavpack.c;h=7358d29735a7ba22db8e08663d5ccd92b289680b;hb=867215336debce9fe38f728ad5c74776a1965785;hp=c8ab858439577e28195e5cc81b0c3082adf7d989;hpb=10c773c12ff2db5894fd8f76f5575cee1793d1c4;p=ffmpeg

diff --git a/libavcodec/wavpack.c b/libavcodec/wavpack.c
index c8ab8584395..7358d29735a 100644
--- a/libavcodec/wavpack.c
+++ b/libavcodec/wavpack.c
@@ -24,7 +24,7 @@
 #include "unary.h"
 
 /**
- * @file libavcodec/wavpack.c
+ * @file
  * WavPack lossless audio decoder
  */
 
@@ -37,6 +37,12 @@
 #define WV_HYBRID_BITRATE 0x00000200
 #define WV_HYBRID_BALANCE 0x00000400
 
+#define WV_FLT_SHIFT_ONES 0x01
+#define WV_FLT_SHIFT_SAME 0x02
+#define WV_FLT_SHIFT_SENT 0x04
+#define WV_FLT_ZERO_SENT  0x08
+#define WV_FLT_ZERO_SIGN  0x10
+
 enum WP_ID_Flags{
     WP_IDF_MASK   = 0x1F,
     WP_IDF_IGNORE = 0x20,
@@ -61,6 +67,13 @@ enum WP_ID{
     WP_ID_CHANINFO
 };
 
+typedef struct SavedContext {
+    int offset;
+    int size;
+    int bits_used;
+    uint32_t crc;
+} SavedContext;
+
 #define MAX_TERMS 16
 
 typedef struct Decorr {
@@ -97,7 +110,14 @@ typedef struct WavpackContext {
     int and, or, shift;
     int post_shift;
     int hybrid, hybrid_bitrate;
+    int float_flag;
+    int float_shift;
+    int float_max_exp;
     WvChannel ch[2];
+    int samples_left;
+    int max_samples;
+    int pos;
+    SavedContext sc, extra_sc;
 } WavpackContext;
 
 // exponent table copied from WavPack source
@@ -341,18 +361,115 @@ static int wv_get_value(WavpackContext *ctx, GetBitContext *gb, int channel, int
     return sign ? ~ret : ret;
 }
 
-static inline int wv_unpack_stereo(WavpackContext *s, GetBitContext *gb, void *dst, const int hires)
+static inline int wv_get_value_integer(WavpackContext *s, uint32_t *crc, int S)
+{
+    int bit;
+
+    if(s->extra_bits){
+        S <<= s->extra_bits;
+
+        if(s->got_extra_bits){
+            S |= get_bits(&s->gb_extra_bits, s->extra_bits);
+            *crc = *crc * 9 + (S&0xffff) * 3 + ((unsigned)S>>16);
+        }
+    }
+    bit = (S & s->and) | s->or;
+    return (((S + bit) << s->shift) - bit) << s->post_shift;
+}
+
+static float wv_get_value_float(WavpackContext *s, uint32_t *crc, int S)
+{
+    union {
+        float    f;
+        uint32_t u;
+    } value;
+
+    int sign;
+    int exp = s->float_max_exp;
+
+    if(s->got_extra_bits){
+        const int max_bits = 1 + 23 + 8 + 1;
+        const int left_bits = get_bits_left(&s->gb_extra_bits);
+
+        if(left_bits + 8 * FF_INPUT_BUFFER_PADDING_SIZE < max_bits)
+            return 0.0;
+    }
+
+    if(S){
+        S <<= s->float_shift;
+        sign = S < 0;
+        if(sign)
+            S = -S;
+        if(S >= 0x1000000){
+            if(s->got_extra_bits && get_bits1(&s->gb_extra_bits)){
+                S = get_bits(&s->gb_extra_bits, 23);
+            }else{
+                S = 0;
+            }
+            exp = 255;
+        }else if(exp){
+            int shift = 23 - av_log2(S);
+            exp = s->float_max_exp;
+            if(exp <= shift){
+                shift = --exp;
+            }
+            exp -= shift;
+
+            if(shift){
+                S <<= shift;
+                if((s->float_flag & WV_FLT_SHIFT_ONES) ||
+                   (s->got_extra_bits && (s->float_flag & WV_FLT_SHIFT_SAME) && get_bits1(&s->gb_extra_bits)) ){
+                    S |= (1 << shift) - 1;
+                } else if(s->got_extra_bits && (s->float_flag & WV_FLT_SHIFT_SENT)){
+                    S |= get_bits(&s->gb_extra_bits, shift);
+                }
+            }
+        }else{
+            exp = s->float_max_exp;
+        }
+        S &= 0x7fffff;
+    }else{
+        sign = 0;
+        exp = 0;
+        if(s->got_extra_bits && (s->float_flag & WV_FLT_ZERO_SENT)){
+            if(get_bits1(&s->gb_extra_bits)){
+                S = get_bits(&s->gb_extra_bits, 23);
+                if(s->float_max_exp >= 25)
+                    exp = get_bits(&s->gb_extra_bits, 8);
+                sign = get_bits1(&s->gb_extra_bits);
+            }else{
+                if(s->float_flag & WV_FLT_ZERO_SIGN)
+                    sign = get_bits1(&s->gb_extra_bits);
+            }
+        }
+    }
+
+    *crc = *crc * 27 + S * 9 + exp * 3 + sign;
+
+    value.u = (sign << 31) | (exp << 23) | S;
+    return value.f;
+}
+
+static void wv_reset_saved_context(WavpackContext *s)
+{
+    s->pos = 0;
+    s->sc.crc = s->extra_sc.crc = 0xFFFFFFFF;
+}
+
+static inline int wv_unpack_stereo(WavpackContext *s, GetBitContext *gb, void *dst, const int type)
 {
     int i, j, count = 0;
     int last, t;
-    int A, B, L, L2, R, R2, bit;
-    int pos = 0;
-    uint32_t crc = 0xFFFFFFFF;
-    uint32_t crc_extra_bits = 0xFFFFFFFF;
+    int A, B, L, L2, R, R2;
+    int pos = s->pos;
+    uint32_t crc = s->sc.crc;
+    uint32_t crc_extra_bits = s->extra_sc.crc;
     int16_t *dst16 = dst;
     int32_t *dst32 = dst;
+    float   *dstfl = dst;
 
-    s->one = s->zero = s->zeroes = 0;
+    if(s->samples_left == s->samples)
+        s->one = s->zero = s->zeroes = 0;
     do{
         L = wv_get_value(s, gb, 0, &last);
         if(last) break;
@@ -377,7 +494,7 @@ static inline int wv_unpack_stereo(WavpackContext *s, GetBitContext *gb, void *d
                     B = s->decorr[i].samplesB[pos];
                     j = (pos + t) & 7;
                 }
-                if(hires){
+                if(type != SAMPLE_FMT_S16){
                     L2 = L + ((s->decorr[i].weightA * (int64_t)A + 512) >> 10);
                     R2 = R + ((s->decorr[i].weightB * (int64_t)B + 512) >> 10);
                 }else{
@@ -389,13 +506,13 @@ static inline int wv_unpack_stereo(WavpackContext *s, GetBitContext *gb, void *d
                 s->decorr[i].samplesA[j] = L = L2;
                 s->decorr[i].samplesB[j] = R = R2;
             }else if(t == -1){
-                if(hires)
+                if(type != SAMPLE_FMT_S16)
                     L2 = L + ((s->decorr[i].weightA * (int64_t)s->decorr[i].samplesA[0] + 512) >> 10);
                 else
                     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;
-                if(hires)
+                if(type != SAMPLE_FMT_S16)
                     R2 = R + ((s->decorr[i].weightB * (int64_t)L2 + 512) >> 10);
                 else
                     R2 = R + ((s->decorr[i].weightB * L2 + 512) >> 10);
@@ -403,7 +520,7 @@ static inline int wv_unpack_stereo(WavpackContext *s, GetBitContext *gb, void *d
                 R = R2;
                 s->decorr[i].samplesA[0] = R;
             }else{
-                if(hires)
+                if(type != SAMPLE_FMT_S16)
                     R2 = R + ((s->decorr[i].weightB * (int64_t)s->decorr[i].samplesB[0] + 512) >> 10);
                 else
                     R2 = R + ((s->decorr[i].weightB * s->decorr[i].samplesB[0] + 512) >> 10);
@@ -415,7 +532,7 @@ static inline int wv_unpack_stereo(WavpackContext *s, GetBitContext *gb, void *d
                     s->decorr[i].samplesA[0] = R;
                 }
 
-                if(hires)
+                if(type != SAMPLE_FMT_S16)
                     L2 = L + ((s->decorr[i].weightA * (int64_t)R2 + 512) >> 10);
                 else
                     L2 = L + ((s->decorr[i].weightA * R2 + 512) >> 10);
@@ -428,54 +545,57 @@ static inline int wv_unpack_stereo(WavpackContext *s, GetBitContext *gb, void *d
         if(s->joint)
             L += (R -= (L >> 1));
         crc = (crc * 3 + L) * 3 + R;
-        if(s->extra_bits){
-            L <<= s->extra_bits;
-            R <<= s->extra_bits;
-
-            if(s->got_extra_bits){
-                L |= get_bits(&s->gb_extra_bits, s->extra_bits);
-                crc_extra_bits = crc_extra_bits * 9 + (L&0xffff) * 3 + ((unsigned)L>>16);
 
-                R |= get_bits(&s->gb_extra_bits, s->extra_bits);
-                crc_extra_bits = crc_extra_bits * 9 + (R&0xffff) * 3 + ((unsigned)R>>16);
-            }
+        if(type == SAMPLE_FMT_FLT){
+            *dstfl++ = wv_get_value_float(s, &crc_extra_bits, L);
+            *dstfl++ = wv_get_value_float(s, &crc_extra_bits, R);
+        } else if(type == SAMPLE_FMT_S32){
+            *dst32++ = wv_get_value_integer(s, &crc_extra_bits, L);
+            *dst32++ = wv_get_value_integer(s, &crc_extra_bits, R);
+        } else {
+            *dst16++ = wv_get_value_integer(s, &crc_extra_bits, L);
+            *dst16++ = wv_get_value_integer(s, &crc_extra_bits, R);
         }
-        bit = (L & s->and) | s->or;
-        if(hires)
-            *dst32++ = (((L + bit) << s->shift) - bit) << s->post_shift;
-        else
-            *dst16++ = (((L + bit) << s->shift) - bit) << s->post_shift;
-        bit = (R & s->and) | s->or;
-        if(hires)
-            *dst32++ = (((R + bit) << s->shift) - bit) << s->post_shift;
-        else
-            *dst16++ = (((R + bit) << s->shift) - bit) << s->post_shift;
         count++;
-    }while(!last && count < s->samples);
+    }while(!last && count < s->max_samples);
 
-    if(crc != s->CRC){
-        av_log(s->avctx, AV_LOG_ERROR, "CRC error\n");
-        return -1;
-    }
-    if(s->got_extra_bits && crc_extra_bits != s->crc_extra_bits){
-        av_log(s->avctx, AV_LOG_ERROR, "Extra bits CRC error\n");
-        return -1;
+    s->samples_left -= count;
+    if(!s->samples_left){
+        if(crc != s->CRC){
+            av_log(s->avctx, AV_LOG_ERROR, "CRC error\n");
+            return -1;
+        }
+        if(s->got_extra_bits && crc_extra_bits != s->crc_extra_bits){
+            av_log(s->avctx, AV_LOG_ERROR, "Extra bits CRC error\n");
+            return -1;
+        }
+        wv_reset_saved_context(s);
+    }else{
+        s->pos = pos;
+        s->sc.crc = crc;
+        s->sc.bits_used = get_bits_count(&s->gb);
+        if(s->got_extra_bits){
+            s->extra_sc.crc = crc_extra_bits;
+            s->extra_sc.bits_used = get_bits_count(&s->gb_extra_bits);
+        }
     }
     return count * 2;
 }
 
-static inline int wv_unpack_mono(WavpackContext *s, GetBitContext *gb, void *dst, const int hires)
+static inline int wv_unpack_mono(WavpackContext *s, GetBitContext *gb, void *dst, const int type)
 {
     int i, j, count = 0;
     int last, t;
-    int A, S, T, bit;
-    int pos = 0;
-    uint32_t crc = 0xFFFFFFFF;
-    uint32_t crc_extra_bits = 0xFFFFFFFF;
+    int A, S, T;
+    int pos = s->pos;
+    uint32_t crc = s->sc.crc;
+    uint32_t crc_extra_bits = s->extra_sc.crc;
     int16_t *dst16 = dst;
     int32_t *dst32 = dst;
+    float   *dstfl = dst;
 
-    s->one = s->zero = s->zeroes = 0;
+    if(s->samples_left == s->samples)
+        s->one = s->zero = s->zeroes = 0;
     do{
         T = wv_get_value(s, gb, 0, &last);
         S = 0;
@@ -493,7 +613,7 @@ static inline int wv_unpack_mono(WavpackContext *s, GetBitContext *gb, void *dst
                 A = s->decorr[i].samplesA[pos];
                 j = (pos + t) & 7;
             }
-            if(hires)
+            if(type != SAMPLE_FMT_S16)
                 S = T + ((s->decorr[i].weightA * (int64_t)A + 512) >> 10);
             else
                 S = T + ((s->decorr[i].weightA * A + 512) >> 10);
@@ -502,30 +622,35 @@ static inline int wv_unpack_mono(WavpackContext *s, GetBitContext *gb, void *dst
         }
         pos = (pos + 1) & 7;
         crc = crc * 3 + S;
-        if(s->extra_bits){
-            S <<= s->extra_bits;
-
-            if(s->got_extra_bits){
-                S |= get_bits(&s->gb_extra_bits, s->extra_bits);
-                crc_extra_bits = crc_extra_bits * 9 + (S&0xffff) * 3 + ((unsigned)S>>16);
-            }
-        }
 
-        bit = (S & s->and) | s->or;
-        if(hires)
-            *dst32++ = (((S + bit) << s->shift) - bit) << s->post_shift;
+        if(type == SAMPLE_FMT_FLT)
+            *dstfl++ = wv_get_value_float(s, &crc_extra_bits, S);
+        else if(type == SAMPLE_FMT_S32)
+            *dst32++ = wv_get_value_integer(s, &crc_extra_bits, S);
         else
-            *dst16++ = (((S + bit) << s->shift) - bit) << s->post_shift;
+            *dst16++ = wv_get_value_integer(s, &crc_extra_bits, S);
         count++;
     }while(!last && count < s->samples);
 
-    if(crc != s->CRC){
-        av_log(s->avctx, AV_LOG_ERROR, "CRC error\n");
-        return -1;
-    }
-    if(s->got_extra_bits && crc_extra_bits != s->crc_extra_bits){
-        av_log(s->avctx, AV_LOG_ERROR, "Extra bits CRC error\n");
-        return -1;
+    s->samples_left -= count;
+    if(!s->samples_left){
+        if(crc != s->CRC){
+            av_log(s->avctx, AV_LOG_ERROR, "CRC error\n");
+            return -1;
+        }
+        if(s->got_extra_bits && crc_extra_bits != s->crc_extra_bits){
+            av_log(s->avctx, AV_LOG_ERROR, "Extra bits CRC error\n");
+            return -1;
+        }
+        wv_reset_saved_context(s);
+    }else{
+        s->pos = pos;
+        s->sc.crc = crc;
+        s->sc.bits_used = get_bits_count(&s->gb);
+        if(s->got_extra_bits){
+            s->extra_sc.crc = crc_extra_bits;
+            s->extra_sc.bits_used = get_bits_count(&s->gb_extra_bits);
+        }
     }
     return count;
 }
@@ -542,6 +667,8 @@ static av_cold int wavpack_decode_init(AVCodecContext *avctx)
         avctx->sample_fmt = SAMPLE_FMT_S32;
     avctx->channel_layout = (avctx->channels==2) ? CH_LAYOUT_STEREO : CH_LAYOUT_MONO;
 
+    wv_reset_saved_context(s);
+
     return 0;
 }
 
@@ -554,7 +681,7 @@ static int wavpack_decode_frame(AVCodecContext *avctx,
     WavpackContext *s = avctx->priv_data;
     void *samples = data;
     int samplecount;
-    int got_terms = 0, got_weights = 0, got_samples = 0, got_entropy = 0, got_bs = 0;
+    int got_terms = 0, got_weights = 0, got_samples = 0, got_entropy = 0, got_bs = 0, got_float = 0;
     int got_hybrid = 0;
     const uint8_t* buf_end = buf + buf_size;
     int i, j, id, size, ssize, weights, t;
@@ -565,11 +692,13 @@ static int wavpack_decode_frame(AVCodecContext *avctx,
         return 0;
     }
 
-    memset(s->decorr, 0, MAX_TERMS * sizeof(Decorr));
-    memset(s->ch, 0, sizeof(s->ch));
-    s->extra_bits = 0;
-    s->and = s->or = s->shift = 0;
-    s->got_extra_bits = 0;
+    if(!s->samples_left){
+        memset(s->decorr, 0, MAX_TERMS * sizeof(Decorr));
+        memset(s->ch, 0, sizeof(s->ch));
+        s->extra_bits = 0;
+        s->and = s->or = s->shift = 0;
+        s->got_extra_bits = 0;
+    }
 
     s->samples = AV_RL32(buf); buf += 4;
     if(!s->samples){
@@ -577,7 +706,10 @@ static int wavpack_decode_frame(AVCodecContext *avctx,
         return buf_size;
     }
     s->frame_flags = AV_RL32(buf); buf += 4;
-    if((s->frame_flags&0x03) <= 1){
+    if(s->frame_flags&0x80){
+        bpp = sizeof(float);
+        avctx->sample_fmt = SAMPLE_FMT_FLT;
+    } else if((s->frame_flags&0x03) <= 1){
         bpp = 2;
         avctx->sample_fmt = SAMPLE_FMT_S16;
     } else {
@@ -591,10 +723,11 @@ static int wavpack_decode_frame(AVCodecContext *avctx,
     s->post_shift = 8 * (bpp-1-(s->frame_flags&0x03)) + ((s->frame_flags >> 13) & 0x1f);
     s->CRC = AV_RL32(buf); buf += 4;
 
-    /* should not happen but who knows */
-    if(s->samples * bpp * avctx->channels > *data_size){
-        av_log(avctx, AV_LOG_ERROR, "Packet size is too big to be handled in lavc!\n");
-        return -1;
+    s->max_samples = *data_size / (bpp * avctx->channels);
+    s->max_samples = FFMIN(s->max_samples, s->samples);
+    if(s->samples_left > 0){
+        s->max_samples = FFMIN(s->max_samples, s->samples_left);
+        buf = buf_end;
     }
 
     // parse metadata blocks
@@ -749,7 +882,21 @@ static int wavpack_decode_frame(AVCodecContext *avctx,
             }
             buf += 4;
             break;
+        case WP_ID_FLOATINFO:
+            if(size != 4){
+                av_log(avctx, AV_LOG_ERROR, "Invalid FLOATINFO, size = %i\n", size);
+                buf += ssize;
+                continue;
+            }
+            s->float_flag = buf[0];
+            s->float_shift = buf[1];
+            s->float_max_exp = buf[2];
+            buf += 4;
+            got_float = 1;
+            break;
         case WP_ID_DATA:
+            s->sc.offset = buf - avpkt->data;
+            s->sc.size   = size * 8;
             init_get_bits(&s->gb, buf, size * 8);
             s->data_size = size * 8;
             buf += size;
@@ -761,6 +908,8 @@ static int wavpack_decode_frame(AVCodecContext *avctx,
                 buf += size;
                 continue;
             }
+            s->extra_sc.offset = buf - avpkt->data;
+            s->extra_sc.size   = size * 8;
             init_get_bits(&s->gb_extra_bits, buf, size * 8);
             s->crc_extra_bits = get_bits_long(&s->gb_extra_bits, 32);
             buf += size;
@@ -771,42 +920,71 @@ static int wavpack_decode_frame(AVCodecContext *avctx,
         }
         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(s->hybrid && !got_hybrid){
-        av_log(avctx, AV_LOG_ERROR, "Hybrid config not found\n");
-        return -1;
-    }
-    if(!got_bs){
-        av_log(avctx, AV_LOG_ERROR, "Packed samples not found\n");
-        return -1;
+    if(!s->samples_left){
+        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(s->hybrid && !got_hybrid){
+            av_log(avctx, AV_LOG_ERROR, "Hybrid config not found\n");
+            return -1;
+        }
+        if(!got_bs){
+            av_log(avctx, AV_LOG_ERROR, "Packed samples not found\n");
+            return -1;
+        }
+        if(!got_float && avctx->sample_fmt == SAMPLE_FMT_FLT){
+            av_log(avctx, AV_LOG_ERROR, "Float information not found\n");
+            return -1;
+        }
+        if(s->got_extra_bits && avctx->sample_fmt != SAMPLE_FMT_FLT){
+            const int size = get_bits_left(&s->gb_extra_bits);
+            const int wanted = s->samples * s->extra_bits << s->stereo_in;
+            if(size < wanted){
+                av_log(avctx, AV_LOG_ERROR, "Too small EXTRABITS\n");
+                s->got_extra_bits = 0;
+            }
+        }
+        s->samples_left = s->samples;
+    }else{
+        init_get_bits(&s->gb, avpkt->data + s->sc.offset, s->sc.size);
+        skip_bits_long(&s->gb, s->sc.bits_used);
+        if(s->got_extra_bits){
+            init_get_bits(&s->gb_extra_bits, avpkt->data + s->extra_sc.offset,
+                          s->extra_sc.size);
+            skip_bits_long(&s->gb_extra_bits, s->extra_sc.bits_used);
+        }
     }
 
     if(s->stereo_in){
-        if(bpp == 2)
-            samplecount = wv_unpack_stereo(s, &s->gb, samples, 0);
+        if(avctx->sample_fmt == SAMPLE_FMT_S16)
+            samplecount = wv_unpack_stereo(s, &s->gb, samples, SAMPLE_FMT_S16);
+        else if(avctx->sample_fmt == SAMPLE_FMT_S32)
+            samplecount = wv_unpack_stereo(s, &s->gb, samples, SAMPLE_FMT_S32);
         else
-            samplecount = wv_unpack_stereo(s, &s->gb, samples, 1);
+            samplecount = wv_unpack_stereo(s, &s->gb, samples, SAMPLE_FMT_FLT);
+
     }else{
-        if(bpp == 2)
-            samplecount = wv_unpack_mono(s, &s->gb, samples, 0);
+        if(avctx->sample_fmt == SAMPLE_FMT_S16)
+            samplecount = wv_unpack_mono(s, &s->gb, samples, SAMPLE_FMT_S16);
+        else if(avctx->sample_fmt == SAMPLE_FMT_S32)
+            samplecount = wv_unpack_mono(s, &s->gb, samples, SAMPLE_FMT_S32);
         else
-            samplecount = wv_unpack_mono(s, &s->gb, samples, 1);
-        if(s->stereo && bpp == 2){
+            samplecount = wv_unpack_mono(s, &s->gb, samples, SAMPLE_FMT_FLT);
+
+        if(s->stereo && avctx->sample_fmt == SAMPLE_FMT_S16){
             int16_t *dst = (int16_t*)samples + samplecount * 2;
             int16_t *src = (int16_t*)samples + samplecount;
             int cnt = samplecount;
@@ -815,7 +993,7 @@ static int wavpack_decode_frame(AVCodecContext *avctx,
                 *--dst = *src;
             }
             samplecount *= 2;
-        }else if(s->stereo){ //32-bit output
+        }else if(s->stereo && avctx->sample_fmt == SAMPLE_FMT_S32){
             int32_t *dst = (int32_t*)samples + samplecount * 2;
             int32_t *src = (int32_t*)samples + samplecount;
             int cnt = samplecount;
@@ -824,21 +1002,31 @@ static int wavpack_decode_frame(AVCodecContext *avctx,
                 *--dst = *src;
             }
             samplecount *= 2;
+        }else if(s->stereo){
+            float *dst = (float*)samples + samplecount * 2;
+            float *src = (float*)samples + samplecount;
+            int cnt = samplecount;
+            while(cnt--){
+                *--dst = *--src;
+                *--dst = *src;
+            }
+            samplecount *= 2;
         }
     }
     *data_size = samplecount * bpp;
 
-    return buf_size;
+    return s->samples_left > 0 ? 0 : buf_size;
 }
 
 AVCodec wavpack_decoder = {
     "wavpack",
-    CODEC_TYPE_AUDIO,
+    AVMEDIA_TYPE_AUDIO,
     CODEC_ID_WAVPACK,
     sizeof(WavpackContext),
     wavpack_decode_init,
     NULL,
     NULL,
     wavpack_decode_frame,
+    .capabilities = CODEC_CAP_SUBFRAMES,
     .long_name = NULL_IF_CONFIG_SMALL("WavPack"),
 };