mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-07 11:13:41 +02:00
b975aeec02
* commit '2c62fcdf5d617791a653d7957d449f75569eede0': lavc: VAAPI H.264 encoder Merged-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
69 lines
1.9 KiB
C
69 lines
1.9 KiB
C
/*
|
|
* 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 "vaapi_encode_h26x.h"
|
|
|
|
int ff_vaapi_encode_h26x_nal_unit_to_byte_stream(uint8_t *dst, size_t *dst_bit_len,
|
|
uint8_t *src, size_t src_bit_len)
|
|
{
|
|
size_t dp, sp;
|
|
int zero_run = 0;
|
|
size_t dst_len = *dst_bit_len / 8;
|
|
size_t src_len = (src_bit_len + 7) / 8;
|
|
int trailing_zeroes = src_len * 8 - src_bit_len;
|
|
|
|
if (dst_len < src_len + 4) {
|
|
// Definitely doesn't fit.
|
|
goto fail;
|
|
}
|
|
|
|
// Start code.
|
|
dst[0] = dst[1] = dst[2] = 0;
|
|
dst[3] = 1;
|
|
dp = 4;
|
|
|
|
for (sp = 0; sp < src_len; sp++) {
|
|
if (dp >= dst_len)
|
|
goto fail;
|
|
if (zero_run < 2) {
|
|
if (src[sp] == 0)
|
|
++zero_run;
|
|
else
|
|
zero_run = 0;
|
|
} else {
|
|
if ((src[sp] & ~3) == 0) {
|
|
// emulation_prevention_three_byte
|
|
dst[dp++] = 3;
|
|
if (dp >= dst_len)
|
|
goto fail;
|
|
}
|
|
zero_run = src[sp] == 0;
|
|
}
|
|
dst[dp++] = src[sp];
|
|
}
|
|
|
|
*dst_bit_len = 8 * dp - trailing_zeroes;
|
|
return 0;
|
|
|
|
fail:
|
|
*dst_bit_len = 0;
|
|
return AVERROR(ENOSPC);
|
|
}
|