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avcodec/clearvideo: Apply VLC offset during init 

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
This commit is contained in:
Andreas Rheinhardt 2020-11-03 21:07:55 +01:00
parent 222cc6ea26
commit e67e4d43bd
2 changed files with 23 additions and 38 deletions
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7
libavcodec/clearvideo.c
View File

@ -88,7 +88,6 @@ static inline int decode_block(CLVContext *ctx, int16_t *blk, int has_ac,
memset(blk, 0, sizeof(*blk) * 64);
blk[0] = get_vlc2(gb, ctx->dc_vlc.table, CLV_VLC_BITS, 3);
blk[0] -= 63;
if (!has_ac)
return 0;
@ -712,9 +711,9 @@ static av_cold int clv_decode_init(AVCodecContext *avctx)
return AVERROR(ENOMEM);
ff_idctdsp_init(&c->idsp, avctx);
ret = init_vlc(&c->dc_vlc, CLV_VLC_BITS, NUM_DC_CODES,
clv_dc_bits, 1, 1,
clv_dc_codes, 1, 1, 0);
ret = ff_init_vlc_from_lengths(&c->dc_vlc, CLV_VLC_BITS, NUM_DC_CODES,
clv_dc_lens, 1,
clv_dc_syms, 1, 1, -63, 0, avctx);
if (ret) {
av_log(avctx, AV_LOG_ERROR, "Error initialising DC VLC\n");
return ret;

54
libavcodec/clearvideodata.h
View File

@ -28,42 +28,28 @@
#define NUM_DC_CODES 127
#define NUM_AC_CODES 104
static const uint8_t clv_dc_codes[NUM_DC_CODES] = {
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
0x10, 0x11, 0x12, 0x13, 0x13, 0x14, 0x07, 0x0B,
0x0C, 0x08, 0x08, 0x09, 0x04, 0x06, 0x07, 0x05,
0x04, 0x05, 0x04, 0x06, 0x05, 0x06, 0x07, 0x05,
0x06, 0x07, 0x06, 0x07, 0x08, 0x06, 0x07, 0x08,
0x09, 0x0A, 0x0B, 0x07, 0x08, 0x09, 0x07, 0x08,
0x06, 0x07, 0x08, 0x06, 0x04, 0x05, 0x02, 0x01,
0x03, 0x06, 0x07, 0x07, 0x09, 0x0A, 0x0B, 0x09,
0x0A, 0x0B, 0x0A, 0x0B, 0x0C, 0x0D, 0x0C, 0x09,
0x0D, 0x0A, 0x0B, 0x08, 0x09, 0x0A, 0x0B, 0x07,
0x08, 0x09, 0x0A, 0x0B, 0x06, 0x07, 0x06, 0x08,
0x07, 0x09, 0x0A, 0x0B, 0x09, 0x0A, 0x0B, 0x0C,
0x14, 0x0D, 0x0D, 0x0E, 0x0F, 0x15, 0x15, 0x16,
0x17, 0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E,
0x1F, 0x20, 0x21, 0x22, 0x23, 0x24, 0x25,
static const uint8_t clv_dc_lens[NUM_DC_CODES] = {
22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22,
22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22,
21, 21, 21, 20, 20, 20, 19, 19, 19, 19, 19, 19, 19, 19, 19, 18, 18, 18, 18,
17, 17, 17, 17, 16, 16, 16, 15, 15, 15, 15, 14, 14, 14, 14, 14, 14, 14, 14,
13, 13, 12, 12, 12, 12, 12, 12, 12, 12, 11, 11, 11, 11, 11, 11, 10, 10, 10,
10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 7, 7,
7, 7, 7, 7, 6, 6, 5, 5, 5, 5, 3, 3, 1,
};
static const uint8_t clv_dc_bits[NUM_DC_CODES] = {
22, 22, 22, 22, 22, 22, 22, 22,
22, 22, 22, 22, 22, 22, 22, 22,
22, 22, 22, 21, 22, 22, 19, 20,
20, 19, 18, 18, 15, 17, 17, 16,
14, 15, 12, 13, 14, 14, 14, 12,
12, 12, 11, 11, 11, 10, 10, 10,
10, 10, 10, 9, 9, 9, 8, 8,
7, 7, 7, 6, 5, 5, 3, 1,
3, 5, 5, 6, 7, 7, 7, 8,
8, 8, 9, 9, 9, 9, 10, 11,
10, 11, 11, 12, 12, 12, 12, 13,
14, 14, 14, 14, 15, 15, 16, 17,
16, 17, 18, 18, 19, 19, 19, 19,
21, 19, 20, 19, 19, 21, 22, 22,
22, 22, 22, 22, 22, 22, 22, 22,
22, 22, 22, 22, 22, 22, 22,
static const uint8_t clv_dc_syms[NUM_DC_CODES] = {
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B,
0x0C, 0x0D, 0x0E, 0x0F, 0x10, 0x11, 0x12, 0x14, 0x15, 0x6E, 0x6F, 0x70,
0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A, 0x7B, 0x7C,
0x7D, 0x7E, 0x13, 0x68, 0x6D, 0x17, 0x18, 0x6A, 0x16, 0x19, 0x64, 0x65,
0x66, 0x67, 0x69, 0x6B, 0x6C, 0x1A, 0x1B, 0x62, 0x63, 0x1D, 0x1E, 0x5F,
0x61, 0x1F, 0x5E, 0x60, 0x1C, 0x21, 0x5C, 0x5D, 0x20, 0x24, 0x25, 0x26,
0x58, 0x59, 0x5A, 0x5B, 0x23, 0x57, 0x22, 0x27, 0x28, 0x29, 0x53, 0x54,
0x55, 0x56, 0x2A, 0x2B, 0x2C, 0x4F, 0x51, 0x52, 0x2D, 0x2E, 0x2F, 0x30,
0x31, 0x32, 0x4E, 0x50, 0x33, 0x34, 0x35, 0x4A, 0x4B, 0x4C, 0x4D, 0x36,
0x37, 0x47, 0x48, 0x49, 0x38, 0x39, 0x3A, 0x44, 0x45, 0x46, 0x3B, 0x43,
0x3C, 0x3D, 0x41, 0x42, 0x3E, 0x40, 0x3F,
};
static const uint16_t clv_ac_syms[NUM_AC_CODES] = {