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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 "libavutil/imgutils.h" | |
24 | #include "libavutil/avassert.h" | |
25 | #include "avcodec.h" | |
26 | #include "bytestream.h" | |
27 | #include "bmp.h" | |
28 | #include "internal.h" | |
29 | ||
30 | static const uint32_t monoblack_pal[] = { 0x000000, 0xFFFFFF }; | |
31 | static const uint32_t rgb565_masks[] = { 0xF800, 0x07E0, 0x001F }; | |
32 | static const uint32_t rgb444_masks[] = { 0x0F00, 0x00F0, 0x000F }; | |
33 | ||
34 | static av_cold int bmp_encode_init(AVCodecContext *avctx){ | |
35 | switch (avctx->pix_fmt) { | |
36 | case AV_PIX_FMT_BGRA: | |
37 | avctx->bits_per_coded_sample = 32; | |
38 | break; | |
39 | case AV_PIX_FMT_BGR24: | |
40 | avctx->bits_per_coded_sample = 24; | |
41 | break; | |
42 | case AV_PIX_FMT_RGB555: | |
43 | case AV_PIX_FMT_RGB565: | |
44 | case AV_PIX_FMT_RGB444: | |
45 | avctx->bits_per_coded_sample = 16; | |
46 | break; | |
47 | case AV_PIX_FMT_RGB8: | |
48 | case AV_PIX_FMT_BGR8: | |
49 | case AV_PIX_FMT_RGB4_BYTE: | |
50 | case AV_PIX_FMT_BGR4_BYTE: | |
51 | case AV_PIX_FMT_GRAY8: | |
52 | case AV_PIX_FMT_PAL8: | |
53 | avctx->bits_per_coded_sample = 8; | |
54 | break; | |
55 | case AV_PIX_FMT_MONOBLACK: | |
56 | avctx->bits_per_coded_sample = 1; | |
57 | break; | |
58 | default: | |
59 | av_log(avctx, AV_LOG_INFO, "unsupported pixel format\n"); | |
60 | return AVERROR(EINVAL); | |
61 | } | |
62 | ||
63 | avctx->coded_frame = av_frame_alloc(); | |
64 | if (!avctx->coded_frame) | |
65 | return AVERROR(ENOMEM); | |
66 | ||
67 | return 0; | |
68 | } | |
69 | ||
70 | static int bmp_encode_frame(AVCodecContext *avctx, AVPacket *pkt, | |
71 | const AVFrame *pict, int *got_packet) | |
72 | { | |
73 | const AVFrame * const p = pict; | |
74 | int n_bytes_image, n_bytes_per_row, n_bytes, i, n, hsize, ret; | |
75 | const uint32_t *pal = NULL; | |
76 | uint32_t palette256[256]; | |
77 | int pad_bytes_per_row, pal_entries = 0, compression = BMP_RGB; | |
78 | int bit_count = avctx->bits_per_coded_sample; | |
79 | uint8_t *ptr, *buf; | |
80 | ||
81 | avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I; | |
82 | avctx->coded_frame->key_frame = 1; | |
83 | switch (avctx->pix_fmt) { | |
84 | case AV_PIX_FMT_RGB444: | |
85 | compression = BMP_BITFIELDS; | |
86 | pal = rgb444_masks; // abuse pal to hold color masks | |
87 | pal_entries = 3; | |
88 | break; | |
89 | case AV_PIX_FMT_RGB565: | |
90 | compression = BMP_BITFIELDS; | |
91 | pal = rgb565_masks; // abuse pal to hold color masks | |
92 | pal_entries = 3; | |
93 | break; | |
94 | case AV_PIX_FMT_RGB8: | |
95 | case AV_PIX_FMT_BGR8: | |
96 | case AV_PIX_FMT_RGB4_BYTE: | |
97 | case AV_PIX_FMT_BGR4_BYTE: | |
98 | case AV_PIX_FMT_GRAY8: | |
99 | av_assert1(bit_count == 8); | |
100 | avpriv_set_systematic_pal2(palette256, avctx->pix_fmt); | |
101 | pal = palette256; | |
102 | break; | |
103 | case AV_PIX_FMT_PAL8: | |
104 | pal = (uint32_t *)p->data[1]; | |
105 | break; | |
106 | case AV_PIX_FMT_MONOBLACK: | |
107 | pal = monoblack_pal; | |
108 | break; | |
109 | } | |
110 | if (pal && !pal_entries) pal_entries = 1 << bit_count; | |
111 | n_bytes_per_row = ((int64_t)avctx->width * (int64_t)bit_count + 7LL) >> 3LL; | |
112 | pad_bytes_per_row = (4 - n_bytes_per_row) & 3; | |
113 | n_bytes_image = avctx->height * (n_bytes_per_row + pad_bytes_per_row); | |
114 | ||
115 | // STRUCTURE.field refer to the MSVC documentation for BITMAPFILEHEADER | |
116 | // and related pages. | |
117 | #define SIZE_BITMAPFILEHEADER 14 | |
118 | #define SIZE_BITMAPINFOHEADER 40 | |
119 | hsize = SIZE_BITMAPFILEHEADER + SIZE_BITMAPINFOHEADER + (pal_entries << 2); | |
120 | n_bytes = n_bytes_image + hsize; | |
121 | if ((ret = ff_alloc_packet2(avctx, pkt, n_bytes)) < 0) | |
122 | return ret; | |
123 | buf = pkt->data; | |
124 | bytestream_put_byte(&buf, 'B'); // BITMAPFILEHEADER.bfType | |
125 | bytestream_put_byte(&buf, 'M'); // do. | |
126 | bytestream_put_le32(&buf, n_bytes); // BITMAPFILEHEADER.bfSize | |
127 | bytestream_put_le16(&buf, 0); // BITMAPFILEHEADER.bfReserved1 | |
128 | bytestream_put_le16(&buf, 0); // BITMAPFILEHEADER.bfReserved2 | |
129 | bytestream_put_le32(&buf, hsize); // BITMAPFILEHEADER.bfOffBits | |
130 | bytestream_put_le32(&buf, SIZE_BITMAPINFOHEADER); // BITMAPINFOHEADER.biSize | |
131 | bytestream_put_le32(&buf, avctx->width); // BITMAPINFOHEADER.biWidth | |
132 | bytestream_put_le32(&buf, avctx->height); // BITMAPINFOHEADER.biHeight | |
133 | bytestream_put_le16(&buf, 1); // BITMAPINFOHEADER.biPlanes | |
134 | bytestream_put_le16(&buf, bit_count); // BITMAPINFOHEADER.biBitCount | |
135 | bytestream_put_le32(&buf, compression); // BITMAPINFOHEADER.biCompression | |
136 | bytestream_put_le32(&buf, n_bytes_image); // BITMAPINFOHEADER.biSizeImage | |
137 | bytestream_put_le32(&buf, 0); // BITMAPINFOHEADER.biXPelsPerMeter | |
138 | bytestream_put_le32(&buf, 0); // BITMAPINFOHEADER.biYPelsPerMeter | |
139 | bytestream_put_le32(&buf, 0); // BITMAPINFOHEADER.biClrUsed | |
140 | bytestream_put_le32(&buf, 0); // BITMAPINFOHEADER.biClrImportant | |
141 | for (i = 0; i < pal_entries; i++) | |
142 | bytestream_put_le32(&buf, pal[i] & 0xFFFFFF); | |
143 | // BMP files are bottom-to-top so we start from the end... | |
144 | ptr = p->data[0] + (avctx->height - 1) * p->linesize[0]; | |
145 | buf = pkt->data + hsize; | |
146 | for(i = 0; i < avctx->height; i++) { | |
147 | if (bit_count == 16) { | |
148 | const uint16_t *src = (const uint16_t *) ptr; | |
149 | uint16_t *dst = (uint16_t *) buf; | |
150 | for(n = 0; n < avctx->width; n++) | |
151 | AV_WL16(dst + n, src[n]); | |
152 | } else { | |
153 | memcpy(buf, ptr, n_bytes_per_row); | |
154 | } | |
155 | buf += n_bytes_per_row; | |
156 | memset(buf, 0, pad_bytes_per_row); | |
157 | buf += pad_bytes_per_row; | |
158 | ptr -= p->linesize[0]; // ... and go back | |
159 | } | |
160 | ||
161 | pkt->flags |= AV_PKT_FLAG_KEY; | |
162 | *got_packet = 1; | |
163 | return 0; | |
164 | } | |
165 | ||
166 | static av_cold int bmp_encode_close(AVCodecContext *avctx) | |
167 | { | |
168 | av_frame_free(&avctx->coded_frame); | |
169 | return 0; | |
170 | } | |
171 | ||
172 | AVCodec ff_bmp_encoder = { | |
173 | .name = "bmp", | |
174 | .long_name = NULL_IF_CONFIG_SMALL("BMP (Windows and OS/2 bitmap)"), | |
175 | .type = AVMEDIA_TYPE_VIDEO, | |
176 | .id = AV_CODEC_ID_BMP, | |
177 | .init = bmp_encode_init, | |
178 | .encode2 = bmp_encode_frame, | |
179 | .close = bmp_encode_close, | |
180 | .pix_fmts = (const enum AVPixelFormat[]){ | |
181 | AV_PIX_FMT_BGRA, AV_PIX_FMT_BGR24, | |
182 | AV_PIX_FMT_RGB565, AV_PIX_FMT_RGB555, AV_PIX_FMT_RGB444, | |
183 | 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, | |
184 | AV_PIX_FMT_MONOBLACK, | |
185 | AV_PIX_FMT_NONE | |
186 | }, | |
187 | }; |