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libavcodec/svq: Remove ff_svq1_packet_checksum()

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Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-02-19 00:42:33 +01:00
parent 9fc73bf022
commit b4a4aadfaf
5 changed files with 9 additions and 78 deletions
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4
libavcodec/Makefile
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@ -610,10 +610,10 @@ OBJS-$(CONFIG_SUNRAST_ENCODER) += sunrastenc.o
OBJS-$(CONFIG_LIBRSVG_DECODER) += librsvgdec.o
OBJS-$(CONFIG_SBC_DECODER) += sbcdec.o sbcdec_data.o sbc.o
OBJS-$(CONFIG_SBC_ENCODER) += sbcenc.o sbc.o sbcdsp.o sbcdsp_data.o
OBJS-$(CONFIG_SVQ1_DECODER) += svq1dec.o svq1.o svq13.o h263data.o
OBJS-$(CONFIG_SVQ1_DECODER) += svq1dec.o svq1.o h263data.o
OBJS-$(CONFIG_SVQ1_ENCODER) += svq1enc.o svq1.o h263data.o \
h263.o ituh263enc.o
OBJS-$(CONFIG_SVQ3_DECODER) += svq3.o svq13.o mpegutils.o h264data.o
OBJS-$(CONFIG_SVQ3_DECODER) += svq3.o mpegutils.o h264data.o
OBJS-$(CONFIG_TEXT_DECODER) += textdec.o ass.o
OBJS-$(CONFIG_TEXT_ENCODER) += srtenc.o ass_split.o
OBJS-$(CONFIG_TAK_DECODER) += takdec.o tak.o takdsp.o

3
libavcodec/svq1.h
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@ -42,9 +42,6 @@
#define SVQ1_BLOCK_INTER_4V 2
#define SVQ1_BLOCK_INTRA 3
uint16_t ff_svq1_packet_checksum(const uint8_t *data,
const int length, int value);
extern const int8_t *const ff_svq1_inter_codebooks[6];
extern const int8_t *const ff_svq1_intra_codebooks[6];

69
libavcodec/svq13.c
View File

@ -1,69 +0,0 @@
/*
* SVQ1/SVQ3 decoder common code
*
* This file is part of FFmpeg.
*
* FFmpeg 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 2.1 of the License, or (at your option) any later version.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdint.h>
#include "svq1.h"
static const uint16_t checksum_table[256] = {
0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50A5, 0x60C6, 0x70E7,
0x8108, 0x9129, 0xA14A, 0xB16B, 0xC18C, 0xD1AD, 0xE1CE, 0xF1EF,
0x1231, 0x0210, 0x3273, 0x2252, 0x52B5, 0x4294, 0x72F7, 0x62D6,
0x9339, 0x8318, 0xB37B, 0xA35A, 0xD3BD, 0xC39C, 0xF3FF, 0xE3DE,
0x2462, 0x3443, 0x0420, 0x1401, 0x64E6, 0x74C7, 0x44A4, 0x5485,
0xA56A, 0xB54B, 0x8528, 0x9509, 0xE5EE, 0xF5CF, 0xC5AC, 0xD58D,
0x3653, 0x2672, 0x1611, 0x0630, 0x76D7, 0x66F6, 0x5695, 0x46B4,
0xB75B, 0xA77A, 0x9719, 0x8738, 0xF7DF, 0xE7FE, 0xD79D, 0xC7BC,
0x48C4, 0x58E5, 0x6886, 0x78A7, 0x0840, 0x1861, 0x2802, 0x3823,
0xC9CC, 0xD9ED, 0xE98E, 0xF9AF, 0x8948, 0x9969, 0xA90A, 0xB92B,
0x5AF5, 0x4AD4, 0x7AB7, 0x6A96, 0x1A71, 0x0A50, 0x3A33, 0x2A12,
0xDBFD, 0xCBDC, 0xFBBF, 0xEB9E, 0x9B79, 0x8B58, 0xBB3B, 0xAB1A,
0x6CA6, 0x7C87, 0x4CE4, 0x5CC5, 0x2C22, 0x3C03, 0x0C60, 0x1C41,
0xEDAE, 0xFD8F, 0xCDEC, 0xDDCD, 0xAD2A, 0xBD0B, 0x8D68, 0x9D49,
0x7E97, 0x6EB6, 0x5ED5, 0x4EF4, 0x3E13, 0x2E32, 0x1E51, 0x0E70,
0xFF9F, 0xEFBE, 0xDFDD, 0xCFFC, 0xBF1B, 0xAF3A, 0x9F59, 0x8F78,
0x9188, 0x81A9, 0xB1CA, 0xA1EB, 0xD10C, 0xC12D, 0xF14E, 0xE16F,
0x1080, 0x00A1, 0x30C2, 0x20E3, 0x5004, 0x4025, 0x7046, 0x6067,
0x83B9, 0x9398, 0xA3FB, 0xB3DA, 0xC33D, 0xD31C, 0xE37F, 0xF35E,
0x02B1, 0x1290, 0x22F3, 0x32D2, 0x4235, 0x5214, 0x6277, 0x7256,
0xB5EA, 0xA5CB, 0x95A8, 0x8589, 0xF56E, 0xE54F, 0xD52C, 0xC50D,
0x34E2, 0x24C3, 0x14A0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,
0xA7DB, 0xB7FA, 0x8799, 0x97B8, 0xE75F, 0xF77E, 0xC71D, 0xD73C,
0x26D3, 0x36F2, 0x0691, 0x16B0, 0x6657, 0x7676, 0x4615, 0x5634,
0xD94C, 0xC96D, 0xF90E, 0xE92F, 0x99C8, 0x89E9, 0xB98A, 0xA9AB,
0x5844, 0x4865, 0x7806, 0x6827, 0x18C0, 0x08E1, 0x3882, 0x28A3,
0xCB7D, 0xDB5C, 0xEB3F, 0xFB1E, 0x8BF9, 0x9BD8, 0xABBB, 0xBB9A,
0x4A75, 0x5A54, 0x6A37, 0x7A16, 0x0AF1, 0x1AD0, 0x2AB3, 0x3A92,
0xFD2E, 0xED0F, 0xDD6C, 0xCD4D, 0xBDAA, 0xAD8B, 0x9DE8, 0x8DC9,
0x7C26, 0x6C07, 0x5C64, 0x4C45, 0x3CA2, 0x2C83, 0x1CE0, 0x0CC1,
0xEF1F, 0xFF3E, 0xCF5D, 0xDF7C, 0xAF9B, 0xBFBA, 0x8FD9, 0x9FF8,
0x6E17, 0x7E36, 0x4E55, 0x5E74, 0x2E93, 0x3EB2, 0x0ED1, 0x1EF0
};
uint16_t ff_svq1_packet_checksum (const uint8_t *data,
const int length, int value)
{
int i;
for (i = 0; i < length; i++)
value = checksum_table[data[i] ^ (value >> 8)] ^ ((value & 0xFF) << 8);
return value;
}

6
libavcodec/svq1dec.c
View File

@ -32,6 +32,8 @@
* http://www.pcisys.net/~melanson/codecs/
*/
#include "libavutil/crc.h"
#include "avcodec.h"
#include "get_bits.h"
#include "h263.h"
@ -546,9 +548,7 @@ static int svq1_decode_frame_header(AVCodecContext *avctx, AVFrame *frame)
if (s->frame_code == 0x50 || s->frame_code == 0x60) {
int csum = get_bits(bitbuf, 16);
csum = ff_svq1_packet_checksum(bitbuf->buffer,
bitbuf->size_in_bits >> 3,
csum);
csum = av_bswap16(av_crc(av_crc_get_table(AV_CRC_16_CCITT), av_bswap16(csum), bitbuf->buffer, bitbuf->size_in_bits >> 3));
ff_dlog(avctx, "%s checksum (%02x) for packet data\n",
(csum == 0) ? "correct" : "incorrect", csum);

5
libavcodec/svq3.c
View File

@ -43,6 +43,8 @@
#include <inttypes.h>
#include "libavutil/attributes.h"
#include "libavutil/crc.h"
#include "internal.h"
#include "avcodec.h"
#include "mpegutils.h"
@ -1293,7 +1295,8 @@ static av_cold int svq3_decode_init(AVCodecContext *avctx)
ret = -1;
goto fail;
}
s->watermark_key = ff_svq1_packet_checksum(buf, buf_len, 0);
s->watermark_key = av_bswap16(av_crc(av_crc_get_table(AV_CRC_16_CCITT), 0, buf, buf_len));
s->watermark_key = s->watermark_key << 16 | s->watermark_key;
av_log(avctx, AV_LOG_DEBUG,
"watermark key %#"PRIx32"\n", s->watermark_key);