package/mpp
1
0
Fork 0
mirror of https://github.com/nyanmisaka/mpp.git synced 2025-10-11 03:50:03 +08:00
Code Issues Actions Packages Projects Releases Wiki Activity

[mpp_bitread]: add new type for sei payload parse

Browse Source 
The quantity of emulation prevention bytes is not
included in the size payloadSize of an SEI payload.
So add PSEUDO_CODE_H264_H265_SEI type for sei payload parse.

Signed-off-by: Yandong Lin <yandong.lin@rock-chips.com>
Change-Id: I92554de98ffca2f81785aa81b2f652099dbe6ae9
This commit is contained in:
Yandong Lin
2023-07-12 15:03:52 +08:00
committed by Herman Chen
parent cb8fa73dbd
commit d180aebb6b
2 changed files with 27 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
mpp/base/inc/mpp_bitread.h
View File

@@ -96,6 +96,7 @@
typedef enum PseudoCodeType_e {
PSEUDO_CODE_NONE = 0,
PSEUDO_CODE_H264_H265,
PSEUDO_CODE_H264_H265_SEI,
PSEUDO_CODE_AVS2,
PSEUDO_CODE_BUT
} PseudoCodeType;

26
mpp/base/mpp_bitread.c
View File

@@ -63,6 +63,29 @@ static MPP_RET update_curbyte_h264(BitReadCtx_t *bitctx)
return MPP_OK;
}
static MPP_RET update_curbyte_h2645_sei(BitReadCtx_t *bitctx)
{
if (bitctx->bytes_left_ < 1)
return MPP_ERR_READ_BIT;
// Emulation prevention three-byte detection.
// If a sequence of 0x000003 is found, skip (ignore) the last byte (0x03).
if ((*bitctx->data_ == 0x03)
&& ((bitctx->prev_two_bytes_ & 0xffff) == 0)) {
// Detected 0x000003, skip last byte.
++bitctx->data_;
// Need another full three bytes before we can detect the sequence again.
bitctx->prev_two_bytes_ = 0xffff;
}
// Load a new byte and advance pointers.
bitctx->curr_byte_ = *bitctx->data_++ & 0xff;
--bitctx->bytes_left_;
bitctx->num_remaining_bits_in_curr_byte_ = 8;
bitctx->prev_two_bytes_ = (bitctx->prev_two_bytes_ << 8) | bitctx->curr_byte_;
return MPP_OK;
}
static MPP_RET update_curbyte_avs2(BitReadCtx_t *bitctx)
{
if (bitctx->bytes_left_ < 1)
@@ -320,6 +343,9 @@ void mpp_set_bitread_pseudo_code_type(BitReadCtx_t *bitctx, PseudoCodeType type)
case PSEUDO_CODE_H264_H265:
bitctx->update_curbyte = update_curbyte_h264;
break;
case PSEUDO_CODE_H264_H265_SEI:
bitctx->update_curbyte = update_curbyte_h2645_sei;
break;
case PSEUDO_CODE_AVS2:
bitctx->update_curbyte = update_curbyte_avs2;
break;