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From: toqsxw@gmail.com
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To: ffmpeg-devel@ffmpeg.org
Date: Wed, 2 Apr 2025 01:16:06 +0800
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Subject: [FFmpeg-devel] [PATCH v1 09/19] avcodec/h274: add ff_h274_hash
functions
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From: Wu Jianhua <toqsxw@outlook.com>
Signed-off-by: Wu Jianhua <toqsxw@outlook.com>
---
libavcodec/h274.c | 163 ++++++++++++++++++++++++++++++++++++++++++++++
libavcodec/h274.h | 7 ++
2 files changed, 170 insertions(+)
diff --git a/libavcodec/h274.c b/libavcodec/h274.c
index 5709200322..9edc705042 100644
--- a/libavcodec/h274.c
+++ b/libavcodec/h274.c
@@ -26,7 +26,11 @@
*/
#include "libavutil/avassert.h"
+#include "libavutil/bswap.h"
+#include "libavutil/crc.h"
#include "libavutil/imgutils.h"
+#include "libavutil/md5.h"
+#include "libavutil/mem.h"
#include "h274.h"
@@ -790,3 +794,162 @@ static const int8_t R64T[64][64] = {
17, -16, 15, -14, 13, -12, 11, -10, 9, -8, 7, -6, 4, -3, 2, -1,
}
};
+
+static int verify_plane_md5(struct AVMD5 *ctx,
+ const uint8_t *src, const int w, const int h, const int stride,
+ const uint8_t *expected)
+{
+#define MD5_SIZE 16
+ uint8_t md5[MD5_SIZE];
+ av_md5_init(ctx);
+ for (int j = 0; j < h; j++) {
+ av_md5_update(ctx, src, w);
+ src += stride;
+ }
+ av_md5_final(ctx, md5);
+
+ if (memcmp(md5, expected, MD5_SIZE))
+ return AVERROR_INVALIDDATA;
+
+ return 0;
+}
+
+static int verify_plane_crc(const uint8_t *src, const int w, const int h, const int stride,
+ const uint8_t *expected)
+{
+ uint32_t crc = 0x0F1D; // CRC-16-CCITT-AUG
+ const AVCRC *ctx = av_crc_get_table(AV_CRC_16_CCITT);
+
+ for (int j = 0; j < h; j++) {
+ crc = av_crc(ctx, crc, src, w);
+ src += stride;
+ }
+ crc = av_bswap16(crc);
+
+ if (memcmp(&crc, expected, sizeof(uint16_t)))
+ return AVERROR_INVALIDDATA;
+
+ return 0;
+}
+
+#define CAL_CHECKSUM(pixel) (checksum + ((pixel) ^ xor_mask))
+static int verify_plane_checksum(const uint8_t *src, const int w, const int h, const int stride, const int ps,
+ const uint8_t *expected)
+{
+ uint32_t checksum = 0;
+
+ for (int y = 0; y < h; y++) {
+ for (int x = 0; x < w; x++) {
+ const int xor_mask = (x & 0xFF) ^ (y & 0xFF) ^ (x >> 8) ^ (y >> 8);
+ checksum = CAL_CHECKSUM(src[x << ps]);
+ if (ps)
+ checksum = CAL_CHECKSUM(src[(x << ps) + 1]);
+ }
+ src += stride;
+ }
+
+ if (checksum != *(uint32_t*)expected)
+ return AVERROR_INVALIDDATA;
+
+ return 0;
+}
+
+static const uint8_t *get_plane_hash(const H274SEIPictureHash *h, const int plane)
+{
+ if (!h->hash_type)
+ return h->md5[plane];
+ if (h->hash_type == 1)
+ return (uint8_t*)&h->crc[plane];
+ return (uint8_t*)&h->checksum[plane];
+}
+
+enum {
+ HASH_MD5SUM,
+ HASH_CRC,
+ HASH_CHECKSUM,
+ HASH_LAST = HASH_CHECKSUM,
+};
+
+struct H274HashContext {
+ int type;
+ struct AVMD5 *ctx;
+};
+
+int ff_h274_hash_freep(H274HashContext **ctx)
+{
+ if (ctx && *ctx) {
+ H274HashContext *c = *ctx;
+ if (c->ctx)
+ av_free(c->ctx);
+ av_freep(ctx);
+ }
+ return 0;
+}
+
+int ff_h274_hash_init(H274HashContext **ctx, const int type)
+{
+ H274HashContext *c;
+
+ if (type > HASH_LAST || !ctx)
+ return AVERROR(EINVAL);
+
+ c = *ctx;
+ if (c) {
+ if (c->type != type) {
+ if (c->type == HASH_MD5SUM)
+ av_freep(&c->ctx);
+ c->type = type;
+ }
+ } else {
+ *ctx = c = av_mallocz(sizeof(H274HashContext));
+ if (!c)
+ return AVERROR(ENOMEM);
+ c->type = type;
+ }
+
+ if (type == HASH_MD5SUM && !c->ctx) {
+ c->ctx = av_md5_alloc();
+ if (!c->ctx)
+ return AVERROR(ENOMEM);
+ }
+
+ return 0;
+}
+
+int ff_h274_hash_verify(H274HashContext *c, const H274SEIPictureHash *hash,
+ const AVFrame *frame, const int coded_width, const int coded_height)
+{
+ const AVPixFmtDescriptor *desc;
+ int err = 0;
+
+ if (!c || !hash || !frame)
+ return AVERROR(EINVAL);
+
+ if (c->type != hash->hash_type)
+ return AVERROR(EINVAL);
+
+ desc = av_pix_fmt_desc_get(frame->format);
+ if (!desc)
+ return AVERROR(EINVAL);
+
+ for (int i = 0; i < desc->nb_components; i++) {
+ const int w = i ? (coded_width >> desc->log2_chroma_w) : coded_width;
+ const int h = i ? (coded_height >> desc->log2_chroma_h) : coded_height;
+ const int ps = desc->comp[i].step - 1;
+ const uint8_t *expected = get_plane_hash(hash, i);
+ const uint8_t *src = frame->data[i];
+ const int stride = frame->linesize[i];
+
+ if (c->type == HASH_MD5SUM)
+ err = verify_plane_md5(c->ctx, src, w << ps, h, stride, expected);
+ else if (c->type == HASH_CRC)
+ err = verify_plane_crc(src, w << ps, h, stride, expected);
+ else if (c->type == HASH_CHECKSUM)
+ err = verify_plane_checksum(src, w, h, stride, ps, expected);
+ if (err < 0)
+ goto fail;
+ }
+
+fail:
+ return err;
+}
diff --git a/libavcodec/h274.h b/libavcodec/h274.h
index e1803edaf3..e2bb1aec55 100644
--- a/libavcodec/h274.h
+++ b/libavcodec/h274.h
@@ -64,6 +64,8 @@ int ff_h274_apply_film_grain(AVFrame *out, const AVFrame *in,
H274FilmGrainDatabase *db,
const AVFilmGrainParams *params);
+typedef struct H274HashContext H274HashContext;
+
typedef struct H274SEIPictureHash {
int present;
union {
@@ -74,4 +76,9 @@ typedef struct H274SEIPictureHash {
uint8_t hash_type;
} H274SEIPictureHash;
+int ff_h274_hash_init(H274HashContext **c, int type);
+int ff_h274_hash_verify(H274HashContext *c, const H274SEIPictureHash *hash,
+ const AVFrame *frame, int coded_width, int coded_height);
+int ff_h274_hash_freep(H274HashContext **c);
+
#endif /* AVCODEC_H274_H */
--
2.44.0.windows.1
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