1 /*****************************************************************************
2 * y4m.c: x264 y4m input module
3 *****************************************************************************
4 * Copyright (C) 2003-2009 x264 project
6 * Authors: Laurent Aimar <fenrir@via.ecp.fr>
7 * Loren Merritt <lorenm@u.washington.edu>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111, USA.
22 *****************************************************************************/
31 int seq_header_len, frame_header_len;
35 #define Y4M_MAGIC "YUV4MPEG2"
36 #define MAX_YUV4_HEADER 80
37 #define Y4M_FRAME_MAGIC "FRAME"
38 #define MAX_FRAME_HEADER 80
40 static int open_file( char *psz_filename, hnd_t *p_handle, x264_param_t *p_param )
42 y4m_hnd_t *h = malloc( sizeof(y4m_hnd_t) );
44 char header[MAX_YUV4_HEADER+10];
45 char *tokstart, *tokend, *header_end;
51 if( !strcmp( psz_filename, "-" ) )
54 h->fh = fopen(psz_filename, "rb");
58 h->frame_header_len = strlen( Y4M_FRAME_MAGIC )+1;
61 for( i = 0; i < MAX_YUV4_HEADER; i++ )
63 header[i] = fgetc( h->fh );
64 if( header[i] == '\n' )
66 /* Add a space after last option. Makes parsing "444" vs
73 if( i == MAX_YUV4_HEADER || strncmp( header, Y4M_MAGIC, strlen( Y4M_MAGIC ) ) )
77 header_end = &header[i+1]; /* Include space */
78 h->seq_header_len = i+1;
79 for( tokstart = &header[strlen( Y4M_MAGIC )+1]; tokstart < header_end; tokstart++ )
81 if( *tokstart == 0x20 )
85 case 'W': /* Width. Required. */
86 h->width = p_param->i_width = strtol( tokstart, &tokend, 10 );
89 case 'H': /* Height. Required. */
90 h->height = p_param->i_height = strtol( tokstart, &tokend, 10 );
93 case 'C': /* Color space */
94 if( strncmp( "420", tokstart, 3 ) )
96 fprintf( stderr, "Colorspace unhandled\n" );
99 tokstart = strchr( tokstart, 0x20 );
101 case 'I': /* Interlace type */
102 switch( *tokstart++ )
110 fprintf( stderr, "Warning, this sequence might be interlaced\n" );
113 case 'F': /* Frame rate - 0:0 if unknown */
114 if( sscanf( tokstart, "%d:%d", &n, &d ) == 2 && n && d )
116 x264_reduce_fraction( &n, &d );
117 p_param->i_fps_num = n;
118 p_param->i_fps_den = d;
120 tokstart = strchr( tokstart, 0x20 );
122 case 'A': /* Pixel aspect - 0:0 if unknown */
123 /* Don't override the aspect ratio if sar has been explicitly set on the commandline. */
124 if( sscanf( tokstart, "%d:%d", &n, &d ) == 2 && n && d && !p_param->vui.i_sar_width && !p_param->vui.i_sar_height )
126 x264_reduce_fraction( &n, &d );
127 p_param->vui.i_sar_width = n;
128 p_param->vui.i_sar_height = d;
130 tokstart = strchr( tokstart, 0x20 );
132 case 'X': /* Vendor extensions */
133 if( !strncmp( "YSCSS=", tokstart, 6 ) )
135 /* Older nonstandard pixel format representation */
137 if( strncmp( "420JPEG",tokstart, 7 ) &&
138 strncmp( "420MPEG2",tokstart, 8 ) &&
139 strncmp( "420PALDV",tokstart, 8 ) )
141 fprintf( stderr, "Unsupported extended colorspace\n" );
145 tokstart = strchr( tokstart, 0x20 );
150 fprintf( stderr, "yuv4mpeg: %ix%i@%i/%ifps, %i:%i\n",
151 h->width, h->height, p_param->i_fps_num, p_param->i_fps_den,
152 p_param->vui.i_sar_width, p_param->vui.i_sar_height );
158 /* Most common case: frame_header = "FRAME" */
159 static int get_frame_total( hnd_t handle )
161 y4m_hnd_t *h = handle;
162 int i_frame_total = 0;
164 if( x264_is_regular_file( h->fh ) )
166 uint64_t init_pos = ftell( h->fh );
167 fseek( h->fh, 0, SEEK_END );
168 uint64_t i_size = ftell( h->fh );
169 fseek( h->fh, init_pos, SEEK_SET );
170 i_frame_total = (int)((i_size - h->seq_header_len) /
171 (3*(h->width*h->height)/2+h->frame_header_len));
174 return i_frame_total;
177 static int read_frame_internal( x264_picture_t *p_pic, y4m_hnd_t *h )
179 int slen = strlen( Y4M_FRAME_MAGIC );
183 /* Read frame header - without terminating '\n' */
184 if( fread( header, 1, slen, h->fh ) != slen )
188 if( strncmp( header, Y4M_FRAME_MAGIC, slen ) )
190 fprintf( stderr, "Bad header magic (%"PRIx32" <=> %s)\n",
191 M32(header), header );
195 /* Skip most of it */
196 while( i < MAX_FRAME_HEADER && fgetc( h->fh ) != '\n' )
198 if( i == MAX_FRAME_HEADER )
200 fprintf( stderr, "Bad frame header!\n" );
203 h->frame_header_len = i+slen+1;
205 if( fread( p_pic->img.plane[0], h->width * h->height, 1, h->fh ) <= 0
206 || fread( p_pic->img.plane[1], h->width * h->height / 4, 1, h->fh ) <= 0
207 || fread( p_pic->img.plane[2], h->width * h->height / 4, 1, h->fh ) <= 0 )
213 static int read_frame( x264_picture_t *p_pic, hnd_t handle, int i_frame )
215 y4m_hnd_t *h = handle;
217 if( i_frame > h->next_frame )
219 if( x264_is_regular_file( h->fh ) )
220 fseek( h->fh, (uint64_t)i_frame*(3*(h->width*h->height)/2+h->frame_header_len)
221 + h->seq_header_len, SEEK_SET );
223 while( i_frame > h->next_frame )
225 if( read_frame_internal( p_pic, h ) )
231 if( read_frame_internal( p_pic, h ) )
234 h->next_frame = i_frame+1;
238 static int close_file( hnd_t handle )
240 y4m_hnd_t *h = handle;
248 cli_input_t y4m_input = { open_file, get_frame_total, x264_picture_alloc, read_frame, NULL, x264_picture_clean, close_file };