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
25 #include "libavutil/imgutils.h"
26 #include "libavutil/avassert.h"
27 #include "avcodec.h"
28 #include "bytestream.h"
29 #include "bmp.h"
30 #include "codec_internal.h"
31 #include "encode.h"
32
33 static const uint32_t monoblack_pal[] = { 0x000000, 0xFFFFFF };
34 static const uint32_t rgb565_masks[] = { 0xF800, 0x07E0, 0x001F };
35 static const uint32_t rgb444_masks[] = { 0x0F00, 0x00F0, 0x000F };
36
bmp_encode_init(AVCodecContext *avctx)37 static av_cold int bmp_encode_init(AVCodecContext *avctx){
38 switch (avctx->pix_fmt) {
39 case AV_PIX_FMT_BGRA:
40 avctx->bits_per_coded_sample = 32;
41 break;
42 case AV_PIX_FMT_BGR24:
43 avctx->bits_per_coded_sample = 24;
44 break;
45 case AV_PIX_FMT_RGB555:
46 case AV_PIX_FMT_RGB565:
47 case AV_PIX_FMT_RGB444:
48 avctx->bits_per_coded_sample = 16;
49 break;
50 case AV_PIX_FMT_RGB8:
51 case AV_PIX_FMT_BGR8:
52 case AV_PIX_FMT_RGB4_BYTE:
53 case AV_PIX_FMT_BGR4_BYTE:
54 case AV_PIX_FMT_GRAY8:
55 case AV_PIX_FMT_PAL8:
56 avctx->bits_per_coded_sample = 8;
57 break;
58 case AV_PIX_FMT_MONOBLACK:
59 avctx->bits_per_coded_sample = 1;
60 break;
61 }
62
63 return 0;
64 }
65
bmp_encode_frame(AVCodecContext *avctx, AVPacket *pkt, const AVFrame *pict, int *got_packet)66 static int bmp_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
67 const AVFrame *pict, int *got_packet)
68 {
69 const AVFrame * const p = pict;
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;
74 int bit_count = avctx->bits_per_coded_sample;
75 uint8_t *ptr, *buf;
76
77 switch (avctx->pix_fmt) {
78 case AV_PIX_FMT_RGB444:
79 compression = BMP_BITFIELDS;
80 pal = rgb444_masks; // abuse pal to hold color masks
81 pal_entries = 3;
82 break;
83 case AV_PIX_FMT_RGB565:
84 compression = BMP_BITFIELDS;
85 pal = rgb565_masks; // abuse pal to hold color masks
86 pal_entries = 3;
87 break;
88 case AV_PIX_FMT_RGB8:
89 case AV_PIX_FMT_BGR8:
90 case AV_PIX_FMT_RGB4_BYTE:
91 case AV_PIX_FMT_BGR4_BYTE:
92 case AV_PIX_FMT_GRAY8:
93 av_assert1(bit_count == 8);
94 avpriv_set_systematic_pal2(palette256, avctx->pix_fmt);
95 pal = palette256;
96 break;
97 case AV_PIX_FMT_PAL8:
98 pal = (uint32_t *)p->data[1];
99 break;
100 case AV_PIX_FMT_MONOBLACK:
101 pal = monoblack_pal;
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
113 hsize = SIZE_BITMAPFILEHEADER + SIZE_BITMAPINFOHEADER + (pal_entries << 2);
114 n_bytes = n_bytes_image + hsize;
115 if ((ret = ff_get_encode_buffer(avctx, pkt, n_bytes, 0)) < 0)
116 return ret;
117 buf = pkt->data;
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
124 bytestream_put_le32(&buf, SIZE_BITMAPINFOHEADER); // BITMAPINFOHEADER.biSize
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...
138 ptr = p->data[0] + (avctx->height - 1) * p->linesize[0];
139 buf = pkt->data + hsize;
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++)
144 AV_WL16(buf + 2 * n, src[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
158 const FFCodec ff_bmp_encoder = {
159 .p.name = "bmp",
160 .p.long_name = NULL_IF_CONFIG_SMALL("BMP (Windows and OS/2 bitmap)"),
161 .p.type = AVMEDIA_TYPE_VIDEO,
162 .p.id = AV_CODEC_ID_BMP,
163 .p.capabilities = AV_CODEC_CAP_DR1,
164 .init = bmp_encode_init,
165 FF_CODEC_ENCODE_CB(bmp_encode_frame),
166 .p.pix_fmts = (const enum AVPixelFormat[]){
167 AV_PIX_FMT_BGRA, AV_PIX_FMT_BGR24,
168 AV_PIX_FMT_RGB565, AV_PIX_FMT_RGB555, AV_PIX_FMT_RGB444,
169 AV_PIX_FMT_RGB8, AV_PIX_FMT_BGR8, AV_PIX_FMT_RGB4_BYTE, AV_PIX_FMT_BGR4_BYTE, AV_PIX_FMT_GRAY8, AV_PIX_FMT_PAL8,
170 AV_PIX_FMT_MONOBLACK,
171 AV_PIX_FMT_NONE
172 },
173 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
174 };
175