mirror of https://git.ffmpeg.org/ffmpeg.git
avcodec/h261dec: Make VLC smaller
The VLC for the macroblock address increment uses nine bits; yet there is no code with this length: All codes are either shorter or longer. So one can make the table smaller without changing the amount of codes that need more than one round of parsing. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
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@ -35,7 +35,7 @@
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#include "h261.h"
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#include "h261.h"
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#include "internal.h"
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#include "internal.h"
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#define H261_MBA_VLC_BITS 9
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#define H261_MBA_VLC_BITS 8
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#define H261_MTYPE_VLC_BITS 6
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#define H261_MTYPE_VLC_BITS 6
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#define H261_MV_VLC_BITS 7
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#define H261_MV_VLC_BITS 7
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#define H261_CBP_VLC_BITS 9
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#define H261_CBP_VLC_BITS 9
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@ -52,7 +52,7 @@ static av_cold void h261_decode_init_static(void)
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{
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{
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INIT_VLC_STATIC(&h261_mba_vlc, H261_MBA_VLC_BITS, 35,
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INIT_VLC_STATIC(&h261_mba_vlc, H261_MBA_VLC_BITS, 35,
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ff_h261_mba_bits, 1, 1,
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ff_h261_mba_bits, 1, 1,
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ff_h261_mba_code, 1, 1, 662);
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ff_h261_mba_code, 1, 1, 540);
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INIT_VLC_STATIC(&h261_mtype_vlc, H261_MTYPE_VLC_BITS, 10,
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INIT_VLC_STATIC(&h261_mtype_vlc, H261_MTYPE_VLC_BITS, 10,
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ff_h261_mtype_bits, 1, 1,
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ff_h261_mtype_bits, 1, 1,
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ff_h261_mtype_code, 1, 1, 80);
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ff_h261_mtype_code, 1, 1, 80);
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