1 /*****************************************************************************
2  * raw.c: raw input
3  *****************************************************************************
4  * Copyright (C) 2003-2021 x264 project
5  *
6  * Authors: Laurent Aimar <fenrir@via.ecp.fr>
7  *          Loren Merritt <lorenm@u.washington.edu>
8  *          Steven Walters <kemuri9@gmail.com>
9  *
10  * This program is free software; you can redistribute it and/or modify
11  * it under the terms of the GNU General Public License as published by
12  * the Free Software Foundation; either version 2 of the License, or
13  * (at your option) any later version.
14  *
15  * This program is distributed in the hope that it will be useful,
16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18  * GNU General Public License for more details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with this program; if not, write to the Free Software
22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02111, USA.
23  *
24  * This program is also available under a commercial proprietary license.
25  * For more information, contact us at licensing@x264.com.
26  *****************************************************************************/
27 
28 #include "input.h"
29 
30 #define FAIL_IF_ERROR( cond, ... ) FAIL_IF_ERR( cond, "raw", __VA_ARGS__ )
31 
32 typedef struct
33 {
34     FILE *fh;
35     int next_frame;
36     int64_t plane_size[4];
37     int64_t frame_size;
38     int bit_depth;
39     cli_mmap_t mmap;
40     int use_mmap;
41 } raw_hnd_t;
42 
open_file(char * psz_filename,hnd_t * p_handle,video_info_t * info,cli_input_opt_t * opt)43 static int open_file( char *psz_filename, hnd_t *p_handle, video_info_t *info, cli_input_opt_t *opt )
44 {
45     raw_hnd_t *h = calloc( 1, sizeof(raw_hnd_t) );
46     if( !h )
47         return -1;
48 
49     if( !opt->resolution )
50     {
51         /* try to parse the file name */
52         for( char *p = psz_filename; *p; p++ )
53             if( *p >= '0' && *p <= '9' && sscanf( p, "%dx%d", &info->width, &info->height ) == 2 )
54                 break;
55     }
56     else
57         sscanf( opt->resolution, "%dx%d", &info->width, &info->height );
58     FAIL_IF_ERROR( !info->width || !info->height, "raw input requires a resolution.\n" );
59     if( opt->colorspace )
60     {
61         for( info->csp = X264_CSP_CLI_MAX-1; info->csp > X264_CSP_NONE; info->csp-- )
62         {
63             if( x264_cli_csps[info->csp].name && !strcasecmp( x264_cli_csps[info->csp].name, opt->colorspace ) )
64                 break;
65         }
66         FAIL_IF_ERROR( info->csp == X264_CSP_NONE, "unsupported colorspace `%s'\n", opt->colorspace );
67     }
68     else /* default */
69         info->csp = X264_CSP_I420;
70 
71     h->bit_depth = opt->bit_depth;
72     FAIL_IF_ERROR( h->bit_depth < 8 || h->bit_depth > 16, "unsupported bit depth `%d'\n", h->bit_depth );
73     if( h->bit_depth > 8 )
74         info->csp |= X264_CSP_HIGH_DEPTH;
75 
76     if( !strcmp( psz_filename, "-" ) )
77         h->fh = stdin;
78     else
79         h->fh = x264_fopen( psz_filename, "rb" );
80     if( h->fh == NULL )
81         return -1;
82 
83     info->thread_safe = 1;
84     info->num_frames  = 0;
85     info->vfr         = 0;
86 
87     const x264_cli_csp_t *csp = x264_cli_get_csp( info->csp );
88     for( int i = 0; i < csp->planes; i++ )
89     {
90         h->plane_size[i] = x264_cli_pic_plane_size( info->csp, info->width, info->height, i );
91         h->frame_size += h->plane_size[i];
92         /* x264_cli_pic_plane_size returns the size in bytes, we need the value in pixels from here on */
93         h->plane_size[i] /= x264_cli_csp_depth_factor( info->csp );
94     }
95 
96     if( x264_is_regular_file( h->fh ) )
97     {
98         fseek( h->fh, 0, SEEK_END );
99         int64_t size = ftell( h->fh );
100         fseek( h->fh, 0, SEEK_SET );
101         info->num_frames = size / h->frame_size;
102         FAIL_IF_ERROR( !info->num_frames, "empty input file\n" );
103 
104         /* Attempt to use memory-mapped input frames if possible */
105         if( !(h->bit_depth & 7) )
106             h->use_mmap = !x264_cli_mmap_init( &h->mmap, h->fh );
107     }
108 
109     *p_handle = h;
110     return 0;
111 }
112 
read_frame_internal(cli_pic_t * pic,raw_hnd_t * h,int bit_depth_uc)113 static int read_frame_internal( cli_pic_t *pic, raw_hnd_t *h, int bit_depth_uc )
114 {
115     int pixel_depth = x264_cli_csp_depth_factor( pic->img.csp );
116 
117     for( int i = 0; i < pic->img.planes; i++ )
118     {
119         if( h->use_mmap )
120         {
121             if( i )
122                 pic->img.plane[i] = pic->img.plane[i-1] + pixel_depth * h->plane_size[i-1];
123         }
124         else if( fread( pic->img.plane[i], pixel_depth, h->plane_size[i], h->fh ) != (uint64_t)h->plane_size[i] )
125             return -1;
126 
127         if( bit_depth_uc )
128         {
129             /* upconvert non 16bit high depth planes to 16bit using the same
130              * algorithm as used in the depth filter. */
131             uint16_t *plane = (uint16_t*)pic->img.plane[i];
132             int64_t pixel_count = h->plane_size[i];
133             int lshift = 16 - h->bit_depth;
134             for( int64_t j = 0; j < pixel_count; j++ )
135                 plane[j] = plane[j] << lshift;
136         }
137     }
138     return 0;
139 }
140 
read_frame(cli_pic_t * pic,hnd_t handle,int i_frame)141 static int read_frame( cli_pic_t *pic, hnd_t handle, int i_frame )
142 {
143     raw_hnd_t *h = handle;
144 
145     if( h->use_mmap )
146     {
147         pic->img.plane[0] = x264_cli_mmap( &h->mmap, i_frame * h->frame_size, h->frame_size );
148         if( !pic->img.plane[0] )
149             return -1;
150     }
151     else if( i_frame > h->next_frame )
152     {
153         if( x264_is_regular_file( h->fh ) )
154             fseek( h->fh, i_frame * h->frame_size, SEEK_SET );
155         else
156             while( i_frame > h->next_frame )
157             {
158                 if( read_frame_internal( pic, h, 0 ) )
159                     return -1;
160                 h->next_frame++;
161             }
162     }
163 
164     if( read_frame_internal( pic, h, h->bit_depth & 7 ) )
165         return -1;
166 
167     h->next_frame = i_frame+1;
168     return 0;
169 }
170 
release_frame(cli_pic_t * pic,hnd_t handle)171 static int release_frame( cli_pic_t *pic, hnd_t handle )
172 {
173     raw_hnd_t *h = handle;
174     if( h->use_mmap )
175         return x264_cli_munmap( &h->mmap, pic->img.plane[0], h->frame_size );
176     return 0;
177 }
178 
picture_alloc(cli_pic_t * pic,hnd_t handle,int csp,int width,int height)179 static int picture_alloc( cli_pic_t *pic, hnd_t handle, int csp, int width, int height )
180 {
181     raw_hnd_t *h = handle;
182     return (h->use_mmap ? x264_cli_pic_init_noalloc : x264_cli_pic_alloc)( pic, csp, width, height );
183 }
184 
picture_clean(cli_pic_t * pic,hnd_t handle)185 static void picture_clean( cli_pic_t *pic, hnd_t handle )
186 {
187     raw_hnd_t *h = handle;
188     if( h->use_mmap )
189         memset( pic, 0, sizeof(cli_pic_t) );
190     else
191         x264_cli_pic_clean( pic );
192 }
193 
close_file(hnd_t handle)194 static int close_file( hnd_t handle )
195 {
196     raw_hnd_t *h = handle;
197     if( !h || !h->fh )
198         return 0;
199     if( h->use_mmap )
200         x264_cli_mmap_close( &h->mmap );
201     fclose( h->fh );
202     free( h );
203     return 0;
204 }
205 
206 const cli_input_t raw_input = { open_file, picture_alloc, read_frame, release_frame, picture_clean, close_file };
207