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From: Nuo Mi <nuomi2021@gmail.com>
To: ffmpeg-devel@ffmpeg.org
Date: Tue, 25 Mar 2025 22:59:28 +0800
Message-Id: <20250325145928.63536-1-nuomi2021@gmail.com>
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Subject: [FFmpeg-devel] [PATCH] avutil/hash: add 16-bit CRC type CCITT_AUG
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It is also referred to as:
SPI-FUJITSU
AUG-CCITT
CRC-CCITT (0x1D0F)
This CRC type used by H.274
---
libavutil/hash.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/libavutil/hash.c b/libavutil/hash.c
index fbc24194de..3659c71c7f 100644
--- a/libavutil/hash.c
+++ b/libavutil/hash.c
@@ -55,6 +55,7 @@
ENTRY(SHA384, "SHA384", 48) \
ENTRY(SHA512, "SHA512", 64) \
ENTRY(CRC32, "CRC32", 4) \
+ ENTRY(CCITT_AUG, "CCITT_AUG", 2) \
ENTRY(ADLER32, "adler32", 4) \
enum hashtype {
@@ -138,9 +139,10 @@ int av_hash_alloc(AVHashContext **ctx, const char *name)
case SHA384:
case SHA512: res->ctx = av_sha512_alloc(); break;
case CRC32: res->crctab = av_crc_get_table(AV_CRC_32_IEEE_LE); break;
+ case CCITT_AUG: res->crctab = av_crc_get_table(AV_CRC_16_CCITT); break;
case ADLER32: break;
}
- if (i != ADLER32 && i != CRC32 && !res->ctx) {
+ if (i != ADLER32 && i != CRC32 && i != CCITT_AUG && !res->ctx) {
av_free(res);
return AVERROR(ENOMEM);
}
@@ -165,6 +167,7 @@ void av_hash_init(AVHashContext *ctx)
case SHA384: av_sha512_init(ctx->ctx, 384); break;
case SHA512: av_sha512_init(ctx->ctx, 512); break;
case CRC32: ctx->crc = UINT32_MAX; break;
+ case CCITT_AUG: ctx->crc = 0x0F1D; break; //Byte swapped value of 0x1D0F
case ADLER32: ctx->crc = 1; break;
}
}
@@ -185,7 +188,8 @@ void av_hash_update(AVHashContext *ctx, const uint8_t *src, size_t len)
case SHA512_256:
case SHA384:
case SHA512: av_sha512_update(ctx->ctx, src, len); break;
- case CRC32: ctx->crc = av_crc(ctx->crctab, ctx->crc, src, len); break;
+ case CRC32:
+ case CCITT_AUG: ctx->crc = av_crc(ctx->crctab, ctx->crc, src, len); break;
case ADLER32: ctx->crc = av_adler32_update(ctx->crc, src, len); break;
}
}
@@ -207,6 +211,7 @@ void av_hash_final(AVHashContext *ctx, uint8_t *dst)
case SHA384:
case SHA512: av_sha512_final(ctx->ctx, dst); break;
case CRC32: AV_WB32(dst, ctx->crc ^ UINT32_MAX); break;
+ case CCITT_AUG: AV_WB16(dst, ctx->crc); break;
case ADLER32: AV_WB32(dst, ctx->crc); break;
}
}
--
2.34.1
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