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x264 source for verification 2026-05-22

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2026-05-22 16:45:04 +08:00
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/*****************************************************************************
* input.c: common input functions
*****************************************************************************
* Copyright (C) 2010-2025 x264 project
*
* Authors: Steven Walters <kemuri9@gmail.com>
* Henrik Gramner <henrik@gramner.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 "input.h"
#ifdef _WIN32
#include <io.h>
#elif HAVE_MMAP
#include <sys/mman.h>
#include <unistd.h>
#endif
const x264_cli_csp_t x264_cli_csps[] = {
[X264_CSP_I400] = { "i400", 1, { 1 }, { 1 }, 1, 1 },
[X264_CSP_I420] = { "i420", 3, { 1, .5, .5 }, { 1, .5, .5 }, 2, 2 },
[X264_CSP_I422] = { "i422", 3, { 1, .5, .5 }, { 1, 1, 1 }, 2, 1 },
[X264_CSP_I444] = { "i444", 3, { 1, 1, 1 }, { 1, 1, 1 }, 1, 1 },
[X264_CSP_YV12] = { "yv12", 3, { 1, .5, .5 }, { 1, .5, .5 }, 2, 2 },
[X264_CSP_YV16] = { "yv16", 3, { 1, .5, .5 }, { 1, 1, 1 }, 2, 1 },
[X264_CSP_YV24] = { "yv24", 3, { 1, 1, 1 }, { 1, 1, 1 }, 1, 1 },
[X264_CSP_NV12] = { "nv12", 2, { 1, 1 }, { 1, .5 }, 2, 2 },
[X264_CSP_NV21] = { "nv21", 2, { 1, 1 }, { 1, .5 }, 2, 2 },
[X264_CSP_NV16] = { "nv16", 2, { 1, 1 }, { 1, 1 }, 2, 1 },
[X264_CSP_YUYV] = { "yuyv", 1, { 2 }, { 1 }, 2, 1 },
[X264_CSP_UYVY] = { "uyvy", 1, { 2 }, { 1 }, 2, 1 },
[X264_CSP_BGR] = { "bgr", 1, { 3 }, { 1 }, 1, 1 },
[X264_CSP_BGRA] = { "bgra", 1, { 4 }, { 1 }, 1, 1 },
[X264_CSP_RGB] = { "rgb", 1, { 3 }, { 1 }, 1, 1 },
};
int x264_cli_csp_is_invalid( int csp )
{
int csp_mask = csp & X264_CSP_MASK;
return csp_mask <= X264_CSP_NONE || csp_mask >= X264_CSP_CLI_MAX ||
csp_mask == X264_CSP_V210 || csp & X264_CSP_OTHER;
}
int x264_cli_csp_depth_factor( int csp )
{
if( x264_cli_csp_is_invalid( csp ) )
return 0;
return (csp & X264_CSP_HIGH_DEPTH) ? 2 : 1;
}
int64_t x264_cli_pic_plane_size( int csp, int width, int height, int plane )
{
int csp_mask = csp & X264_CSP_MASK;
if( x264_cli_csp_is_invalid( csp ) || plane < 0 || plane >= x264_cli_csps[csp_mask].planes )
return 0;
int64_t size = (int64_t)width * height;
size *= x264_cli_csps[csp_mask].width[plane] * x264_cli_csps[csp_mask].height[plane];
size *= x264_cli_csp_depth_factor( csp );
return size;
}
int64_t x264_cli_pic_size( int csp, int width, int height )
{
if( x264_cli_csp_is_invalid( csp ) )
return 0;
int64_t size = 0;
int csp_mask = csp & X264_CSP_MASK;
for( int i = 0; i < x264_cli_csps[csp_mask].planes; i++ )
size += x264_cli_pic_plane_size( csp, width, height, i );
return size;
}
static int cli_pic_init_internal( cli_pic_t *pic, int csp, int width, int height, int align, int alloc )
{
memset( pic, 0, sizeof(cli_pic_t) );
int csp_mask = csp & X264_CSP_MASK;
if( x264_cli_csp_is_invalid( csp ) )
pic->img.planes = 0;
else
pic->img.planes = x264_cli_csps[csp_mask].planes;
pic->img.csp = csp;
pic->img.width = width;
pic->img.height = height;
for( int i = 0; i < pic->img.planes; i++ )
{
int stride = width * x264_cli_csps[csp_mask].width[i];
stride *= x264_cli_csp_depth_factor( csp );
stride = ALIGN( stride, align );
pic->img.stride[i] = stride;
if( alloc )
{
int64_t size = (int64_t)(height * x264_cli_csps[csp_mask].height[i]) * stride;
pic->img.plane[i] = x264_malloc( size );
if( !pic->img.plane[i] )
return -1;
}
}
return 0;
}
int x264_cli_pic_alloc( cli_pic_t *pic, int csp, int width, int height )
{
return cli_pic_init_internal( pic, csp, width, height, 1, 1 );
}
int x264_cli_pic_alloc_aligned( cli_pic_t *pic, int csp, int width, int height )
{
return cli_pic_init_internal( pic, csp, width, height, NATIVE_ALIGN, 1 );
}
int x264_cli_pic_init_noalloc( cli_pic_t *pic, int csp, int width, int height )
{
return cli_pic_init_internal( pic, csp, width, height, 1, 0 );
}
void x264_cli_pic_clean( cli_pic_t *pic )
{
for( int i = 0; i < pic->img.planes; i++ )
x264_free( pic->img.plane[i] );
memset( pic, 0, sizeof(cli_pic_t) );
}
const x264_cli_csp_t *x264_cli_get_csp( int csp )
{
if( x264_cli_csp_is_invalid( csp ) )
return NULL;
return x264_cli_csps + (csp&X264_CSP_MASK);
}
/* Functions for handling memory-mapped input frames */
int x264_cli_mmap_init( cli_mmap_t *h, FILE *fh )
{
#if defined(_WIN32) || HAVE_MMAP
int fd = fileno( fh );
x264_struct_stat file_stat;
if( !x264_fstat( fd, &file_stat ) )
{
h->file_size = file_stat.st_size;
#ifdef _WIN32
HANDLE osfhandle = (HANDLE)_get_osfhandle( fd );
if( osfhandle != INVALID_HANDLE_VALUE )
{
SYSTEM_INFO si;
GetSystemInfo( &si );
h->page_mask = si.dwPageSize - 1;
h->align_mask = si.dwAllocationGranularity - 1;
h->prefetch_virtual_memory = (void*)GetProcAddress( GetModuleHandleW( L"kernel32.dll" ), "PrefetchVirtualMemory" );
h->process_handle = GetCurrentProcess();
h->map_handle = CreateFileMappingW( osfhandle, NULL, PAGE_READONLY, 0, 0, NULL );
return !h->map_handle;
}
#elif HAVE_MMAP && defined(_SC_PAGESIZE)
h->align_mask = sysconf( _SC_PAGESIZE ) - 1;
h->fd = fd;
return h->align_mask < 0 || fd < 0;
#endif
}
#endif
return -1;
}
/* Third-party filters such as swscale can overread the input buffer which may result
* in segfaults. We have to pad the buffer size as a workaround to avoid that. */
#define MMAP_PADDING 64
void *x264_cli_mmap( cli_mmap_t *h, int64_t offset, int64_t size )
{
#if defined(_WIN32) || HAVE_MMAP
uint8_t *base;
int align = offset & h->align_mask;
if( offset < 0 || size < 0 || (uint64_t)size > (SIZE_MAX - MMAP_PADDING - align) )
return NULL;
offset -= align;
size += align;
#ifdef _WIN32
/* If the padding crosses a page boundary we need to increase the mapping size. */
size_t padded_size = (-size & h->page_mask) < MMAP_PADDING ? size + MMAP_PADDING : size;
if( (uint64_t)offset + padded_size > (uint64_t)h->file_size )
{
/* It's not possible to do the POSIX mmap() remapping trick on Windows, so if the padding crosses a
* page boundary past the end of the file we have to copy the entire frame into a padded buffer. */
if( (base = MapViewOfFile( h->map_handle, FILE_MAP_READ, (uint64_t)offset >> 32, offset, size )) )
{
uint8_t *buf = NULL;
HANDLE anon_map = CreateFileMappingW( INVALID_HANDLE_VALUE, NULL, PAGE_READWRITE, (uint64_t)padded_size >> 32, padded_size, NULL );
if( anon_map )
{
if( (buf = MapViewOfFile( anon_map, FILE_MAP_WRITE, 0, 0, 0 )) )
{
buf += align;
memcpy( buf, base + align, size - align );
}
CloseHandle( anon_map );
}
UnmapViewOfFile( base );
return buf;
}
}
else if( (base = MapViewOfFile( h->map_handle, FILE_MAP_READ, (uint64_t)offset >> 32, offset, padded_size )) )
{
/* PrefetchVirtualMemory() is only available on Windows 8 and newer. */
if( h->prefetch_virtual_memory )
{
struct { void *addr; size_t size; } mem_range = { base, size };
h->prefetch_virtual_memory( h->process_handle, 1, &mem_range, 0 );
}
return base + align;
}
#else
size_t padded_size = size + MMAP_PADDING;
if( (base = mmap( NULL, padded_size, PROT_READ, MAP_PRIVATE, h->fd, offset )) != MAP_FAILED )
{
/* Ask the OS to readahead pages. This improves performance whereas
* forcing page faults by manually accessing every page does not.
* Some systems have implemented madvise() but not posix_madvise()
* and vice versa, so check both to see if either is available. */
#ifdef MADV_WILLNEED
madvise( base, size, MADV_WILLNEED );
#elif defined(POSIX_MADV_WILLNEED)
posix_madvise( base, size, POSIX_MADV_WILLNEED );
#endif
/* Remap the file mapping of any padding that crosses a page boundary past the end of
* the file into a copy of the last valid page to prevent reads from invalid memory. */
size_t aligned_size = (padded_size - 1) & ~h->align_mask;
if( offset + aligned_size >= h->file_size )
mmap( base + aligned_size, padded_size - aligned_size, PROT_READ, MAP_PRIVATE|MAP_FIXED, h->fd, (offset + size - 1) & ~h->align_mask );
return base + align;
}
#endif
#endif
return NULL;
}
int x264_cli_munmap( cli_mmap_t *h, void *addr, int64_t size )
{
#if defined(_WIN32) || HAVE_MMAP
void *base = (void*)((intptr_t)addr & ~h->align_mask);
#ifdef _WIN32
return !UnmapViewOfFile( base );
#else
if( size < 0 || size > (SIZE_MAX - MMAP_PADDING - ((intptr_t)addr - (intptr_t)base)) )
return -1;
return munmap( base, size + MMAP_PADDING + (intptr_t)addr - (intptr_t)base );
#endif
#endif
return -1;
}
void x264_cli_mmap_close( cli_mmap_t *h )
{
#ifdef _WIN32
CloseHandle( h->map_handle );
#endif
}