/*****************************************************************************

 * bitstream.c: bitstream writing

 *****************************************************************************

 * Copyright (C) 2003-2025 x264 project

 *

 * Authors: Laurent Aimar <fenrir@via.ecp.fr>

 *          Fiona Glaser <fiona@x264.com>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This program 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 General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02111, USA.

 *

 * This program is also available under a commercial proprietary license.

 * For more information, contact us at licensing@x264.com.

 *****************************************************************************/

#include "common.h"

static uint8_t *nal_escape_c( uint8_t *dst, uint8_t *src, uint8_t *end )

{

    if( src < end ) *dst++ = *src++;

    if( src < end ) *dst++ = *src++;

    while( src < end )

    {

        if( src[0] <= 0x03 && !dst[-2] && !dst[-1] )

            *dst++ = 0x03;

        *dst++ = *src++;

    }

    return dst;

}

#if HAVE_MMX

#include "x86/bitstream.h"

#endif

#if HAVE_ARMV6

#include "arm/bitstream.h"

#endif

#if HAVE_AARCH64

#include "aarch64/bitstream.h"

#endif

/****************************************************************************

 * x264_nal_encode:

 ****************************************************************************/

void x264_nal_encode( x264_t *h, uint8_t *dst, x264_nal_t *nal )

{

    uint8_t *src = nal->p_payload;

    uint8_t *end = nal->p_payload + nal->i_payload;

    uint8_t *orig_dst = dst;

    if( h->param.b_annexb )

    {

        if( nal->b_long_startcode )

            *dst++ = 0x00;

        *dst++ = 0x00;

        *dst++ = 0x00;

        *dst++ = 0x01;

    }

    else /* save room for size later */

        dst += 4;

    /* nal header */

    *dst++ = ( 0x00 << 7 ) | ( nal->i_ref_idc << 5 ) | nal->i_type;

    dst = h->bsf.nal_escape( dst, src, end );

    int size = dst - orig_dst;

    /* Apply AVC-Intra padding */

    if( h->param.i_avcintra_class )

    {

        int padding = nal->i_payload + nal->i_padding + NALU_OVERHEAD - size;

        if( padding > 0 )

        {

            memset( dst, 0, padding );

            size += padding;

        }

        nal->i_padding = X264_MAX( padding, 0 );

    }

    /* Write the size header for mp4/etc */

    if( !h->param.b_annexb )

    {

        /* Size doesn't include the size of the header we're writing now. */

        int chunk_size = size - 4;

        orig_dst[0] = (uint8_t)(chunk_size >> 24);

        orig_dst[1] = (uint8_t)(chunk_size >> 16);

        orig_dst[2] = (uint8_t)(chunk_size >> 8);

        orig_dst[3] = (uint8_t)(chunk_size >> 0);

    }

    nal->i_payload = size;

    nal->p_payload = orig_dst;

    x264_emms();

}

Unexecuted instantiation: x264_8_nal_encode

Unexecuted instantiation: x264_10_nal_encode

void x264_bitstream_init( uint32_t cpu, x264_bitstream_function_t *pf )

{

    memset( pf, 0, sizeof(*pf) );

    pf->nal_escape = nal_escape_c;

#if HAVE_MMX

#if ARCH_X86_64

    pf->cabac_block_residual_internal = x264_cabac_block_residual_internal_sse2;

    pf->cabac_block_residual_rd_internal = x264_cabac_block_residual_rd_internal_sse2;

    pf->cabac_block_residual_8x8_rd_internal = x264_cabac_block_residual_8x8_rd_internal_sse2;

#endif

    if( cpu&X264_CPU_MMX2 )

        pf->nal_escape = x264_nal_escape_mmx2;

    if( cpu&X264_CPU_SSE2 )

    {

        if( cpu&X264_CPU_SSE2_IS_FAST )

            pf->nal_escape = x264_nal_escape_sse2;

    }

#if ARCH_X86_64

    if( cpu&X264_CPU_LZCNT )

    {

        pf->cabac_block_residual_internal = x264_cabac_block_residual_internal_lzcnt;

        pf->cabac_block_residual_rd_internal = x264_cabac_block_residual_rd_internal_lzcnt;

        pf->cabac_block_residual_8x8_rd_internal = x264_cabac_block_residual_8x8_rd_internal_lzcnt;

    }

    if( cpu&X264_CPU_SSSE3 )

    {

        pf->cabac_block_residual_rd_internal = x264_cabac_block_residual_rd_internal_ssse3;

        pf->cabac_block_residual_8x8_rd_internal = x264_cabac_block_residual_8x8_rd_internal_ssse3;

        if( cpu&X264_CPU_LZCNT )

        {

            pf->cabac_block_residual_rd_internal = x264_cabac_block_residual_rd_internal_ssse3_lzcnt;

            pf->cabac_block_residual_8x8_rd_internal = x264_cabac_block_residual_8x8_rd_internal_ssse3_lzcnt;

        }

    }

    if( cpu&X264_CPU_AVX2 )

    {

        pf->nal_escape = x264_nal_escape_avx2;

        pf->cabac_block_residual_internal = x264_cabac_block_residual_internal_avx2;

    }

    if( cpu&X264_CPU_AVX512 )

    {

        pf->cabac_block_residual_internal = x264_cabac_block_residual_internal_avx512;

        pf->cabac_block_residual_rd_internal = x264_cabac_block_residual_rd_internal_avx512;

        pf->cabac_block_residual_8x8_rd_internal = x264_cabac_block_residual_8x8_rd_internal_avx512;

    }

#endif

#endif

#if HAVE_ARMV6

    if( cpu&X264_CPU_NEON )

        pf->nal_escape = x264_nal_escape_neon;

#endif

#if HAVE_AARCH64

    if( cpu&X264_CPU_NEON )

        pf->nal_escape = x264_nal_escape_neon;

#endif

}

Unexecuted instantiation: x264_8_bitstream_init

Unexecuted instantiation: x264_10_bitstream_init