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wavpack: Properly clip samples during lossy decode

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When decoding lossy WavPack samples, they are supposed
to be clipped, in order to be decoded correctly.

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
This commit is contained in:
Derek Buitenhuis 2011-12-03 14:35:23 -05:00 committed by Ronald S. Bultje
parent 425b45d4b0
commit a548b6cbfc
1 changed files with 9 additions and 2 deletions
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11
libavcodec/wavpack.c
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@ -110,7 +110,7 @@ typedef struct WavpackFrameContext {
int extra_bits;
int and, or, shift;
int post_shift;
int hybrid, hybrid_bitrate;
int hybrid, hybrid_bitrate, hybrid_maxclip;
int float_flag;
int float_shift;
int float_max_exp;
@ -403,8 +403,14 @@ static inline int wv_get_value_integer(WavpackFrameContext *s, uint32_t *crc, in
*crc = *crc * 9 + (S&0xffff) * 3 + ((unsigned)S>>16);
}
}
bit = (S & s->and) | s->or;
return (((S + bit) << s->shift) - bit) << s->post_shift;
bit = (((S + bit) << s->shift) - bit);
if(s->hybrid)
bit = av_clip(bit, -s->hybrid_maxclip, s->hybrid_maxclip - 1);
return bit << s->post_shift;
}
static float wv_get_value_float(WavpackFrameContext *s, uint32_t *crc, int S)
@ -792,6 +798,7 @@ static int wavpack_decode_block(AVCodecContext *avctx, int block_no,
s->joint = s->frame_flags & WV_JOINT_STEREO;
s->hybrid = s->frame_flags & WV_HYBRID_MODE;
s->hybrid_bitrate = s->frame_flags & WV_HYBRID_BITRATE;
s->hybrid_maxclip = 1 << ((((s->frame_flags & 0x03) + 1) << 3) - 1);
s->post_shift = 8 * (bpp-1-(s->frame_flags&0x03)) + ((s->frame_flags >> 13) & 0x1f);
s->CRC = AV_RL32(buf); buf += 4;
if(wc->mkv_mode)