1 /*
2 * BMP image format encoder
3 * Copyright (c) 2006, 2007 Michel Bardiaux
4 * Copyright (c) 2009 Daniel Verkamp <daniel at drv.nu>
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23 #include "config.h"
24
32
36
41 break;
44 break;
49 break;
57 break;
60 break;
61 }
62
63 return 0;
64 }
65
67 const AVFrame *pict,
int *got_packet)
68 {
70 int n_bytes_image, n_bytes_per_row, n_bytes,
i, n, hsize,
ret;
71 const uint32_t *pal =
NULL;
72 uint32_t palette256[256];
73 int pad_bytes_per_row, pal_entries = 0, compression =
BMP_RGB;
75 uint8_t *ptr, *buf;
76
81 pal_entries = 3;
82 break;
86 pal_entries = 3;
87 break;
95 pal = palette256;
96 break;
98 pal = (uint32_t *)p->
data[1];
99 break;
102 break;
103 }
104 if (pal && !pal_entries) pal_entries = 1 << bit_count;
105 n_bytes_per_row = ((int64_t)avctx->
width * (int64_t)bit_count + 7LL) >> 3LL;
106 pad_bytes_per_row = (4 - n_bytes_per_row) & 3;
107 n_bytes_image = avctx->
height * (n_bytes_per_row + pad_bytes_per_row);
108
109 // STRUCTURE.field refer to the MSVC documentation for BITMAPFILEHEADER
110 // and related pages.
111 #define SIZE_BITMAPFILEHEADER 14
112 #define SIZE_BITMAPINFOHEADER 40
114 n_bytes = n_bytes_image + hsize;
118 bytestream_put_byte(&buf, 'B'); // BITMAPFILEHEADER.bfType
119 bytestream_put_byte(&buf, 'M'); // do.
120 bytestream_put_le32(&buf, n_bytes); // BITMAPFILEHEADER.bfSize
121 bytestream_put_le16(&buf, 0); // BITMAPFILEHEADER.bfReserved1
122 bytestream_put_le16(&buf, 0); // BITMAPFILEHEADER.bfReserved2
123 bytestream_put_le32(&buf, hsize); // BITMAPFILEHEADER.bfOffBits
125 bytestream_put_le32(&buf, avctx->
width);
// BITMAPINFOHEADER.biWidth
126 bytestream_put_le32(&buf, avctx->
height);
// BITMAPINFOHEADER.biHeight
127 bytestream_put_le16(&buf, 1); // BITMAPINFOHEADER.biPlanes
128 bytestream_put_le16(&buf, bit_count); // BITMAPINFOHEADER.biBitCount
129 bytestream_put_le32(&buf, compression); // BITMAPINFOHEADER.biCompression
130 bytestream_put_le32(&buf, n_bytes_image); // BITMAPINFOHEADER.biSizeImage
131 bytestream_put_le32(&buf, 0); // BITMAPINFOHEADER.biXPelsPerMeter
132 bytestream_put_le32(&buf, 0); // BITMAPINFOHEADER.biYPelsPerMeter
133 bytestream_put_le32(&buf, 0); // BITMAPINFOHEADER.biClrUsed
134 bytestream_put_le32(&buf, 0); // BITMAPINFOHEADER.biClrImportant
135 for (
i = 0;
i < pal_entries;
i++)
136 bytestream_put_le32(&buf, pal[
i] & 0xFFFFFF);
137 // BMP files are bottom-to-top so we start from the end...
140 for(
i = 0; i < avctx->
height;
i++) {
141 if (HAVE_BIGENDIAN && bit_count == 16) {
142 const uint16_t *
src = (
const uint16_t *) ptr;
143 for(n = 0; n < avctx->
width; n++)
145 } else {
146 memcpy(buf, ptr, n_bytes_per_row);
147 }
148 buf += n_bytes_per_row;
149 memset(buf, 0, pad_bytes_per_row);
150 buf += pad_bytes_per_row;
151 ptr -= p->
linesize[0];
// ... and go back
152 }
153
154 *got_packet = 1;
155 return 0;
156 }
157
172 },
174 };