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 "avcodec.h" 24#include "bytestream.h" 25#include "bmp.h" 26 27static const uint32_t monoblack_pal[] = { 0x000000, 0xFFFFFF }; 28static const uint32_t rgb565_masks[] = { 0xF800, 0x07E0, 0x001F }; 29 30static av_cold int bmp_encode_init(AVCodecContext *avctx){ 31 BMPContext *s = avctx->priv_data; 32 33 avcodec_get_frame_defaults((AVFrame*)&s->picture); 34 avctx->coded_frame = (AVFrame*)&s->picture; 35 36 return 0; 37} 38 39static int bmp_encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){ 40 BMPContext *s = avctx->priv_data; 41 AVFrame *pict = data; 42 AVFrame * const p= (AVFrame*)&s->picture; 43 int n_bytes_image, n_bytes_per_row, n_bytes, i, n, hsize; 44 const uint32_t *pal = NULL; 45 int pad_bytes_per_row, bit_count, pal_entries = 0, compression = BMP_RGB; 46 uint8_t *ptr; 47 unsigned char* buf0 = buf; 48 *p = *pict; 49 p->pict_type= FF_I_TYPE; 50 p->key_frame= 1; 51 switch (avctx->pix_fmt) { 52 case PIX_FMT_BGR24: 53 bit_count = 24; 54 break; 55 case PIX_FMT_RGB555: 56 bit_count = 16; 57 break; 58 case PIX_FMT_RGB565: 59 bit_count = 16; 60 compression = BMP_BITFIELDS; 61 pal = rgb565_masks; // abuse pal to hold color masks 62 pal_entries = 3; 63 break; 64 case PIX_FMT_RGB8: 65 case PIX_FMT_BGR8: 66 case PIX_FMT_RGB4_BYTE: 67 case PIX_FMT_BGR4_BYTE: 68 case PIX_FMT_GRAY8: 69 case PIX_FMT_PAL8: 70 bit_count = 8; 71 pal = (uint32_t *)p->data[1]; 72 break; 73 case PIX_FMT_MONOBLACK: 74 bit_count = 1; 75 pal = monoblack_pal; 76 break; 77 default: 78 return -1; 79 } 80 if (pal && !pal_entries) pal_entries = 1 << bit_count; 81 n_bytes_per_row = ((int64_t)avctx->width * (int64_t)bit_count + 7LL) >> 3LL; 82 pad_bytes_per_row = (4 - n_bytes_per_row) & 3; 83 n_bytes_image = avctx->height * (n_bytes_per_row + pad_bytes_per_row); 84 85 // STRUCTURE.field refer to the MSVC documentation for BITMAPFILEHEADER 86 // and related pages. 87#define SIZE_BITMAPFILEHEADER 14 88#define SIZE_BITMAPINFOHEADER 40 89 hsize = SIZE_BITMAPFILEHEADER + SIZE_BITMAPINFOHEADER + (pal_entries << 2); 90 n_bytes = n_bytes_image + hsize; 91 if(n_bytes>buf_size) { 92 av_log(avctx, AV_LOG_ERROR, "buf size too small (need %d, got %d)\n", n_bytes, buf_size); 93 return -1; 94 } 95 bytestream_put_byte(&buf, 'B'); // BITMAPFILEHEADER.bfType 96 bytestream_put_byte(&buf, 'M'); // do. 97 bytestream_put_le32(&buf, n_bytes); // BITMAPFILEHEADER.bfSize 98 bytestream_put_le16(&buf, 0); // BITMAPFILEHEADER.bfReserved1 99 bytestream_put_le16(&buf, 0); // BITMAPFILEHEADER.bfReserved2 100 bytestream_put_le32(&buf, hsize); // BITMAPFILEHEADER.bfOffBits 101 bytestream_put_le32(&buf, SIZE_BITMAPINFOHEADER); // BITMAPINFOHEADER.biSize 102 bytestream_put_le32(&buf, avctx->width); // BITMAPINFOHEADER.biWidth 103 bytestream_put_le32(&buf, avctx->height); // BITMAPINFOHEADER.biHeight 104 bytestream_put_le16(&buf, 1); // BITMAPINFOHEADER.biPlanes 105 bytestream_put_le16(&buf, bit_count); // BITMAPINFOHEADER.biBitCount 106 bytestream_put_le32(&buf, compression); // BITMAPINFOHEADER.biCompression 107 bytestream_put_le32(&buf, n_bytes_image); // BITMAPINFOHEADER.biSizeImage 108 bytestream_put_le32(&buf, 0); // BITMAPINFOHEADER.biXPelsPerMeter 109 bytestream_put_le32(&buf, 0); // BITMAPINFOHEADER.biYPelsPerMeter 110 bytestream_put_le32(&buf, 0); // BITMAPINFOHEADER.biClrUsed 111 bytestream_put_le32(&buf, 0); // BITMAPINFOHEADER.biClrImportant 112 for (i = 0; i < pal_entries; i++) 113 bytestream_put_le32(&buf, pal[i] & 0xFFFFFF); 114 // BMP files are bottom-to-top so we start from the end... 115 ptr = p->data[0] + (avctx->height - 1) * p->linesize[0]; 116 buf = buf0 + hsize; 117 for(i = 0; i < avctx->height; i++) { 118 if (bit_count == 16) { 119 const uint16_t *src = (const uint16_t *) ptr; 120 uint16_t *dst = (uint16_t *) buf; 121 for(n = 0; n < avctx->width; n++) 122 AV_WL16(dst + n, src[n]); 123 } else { 124 memcpy(buf, ptr, n_bytes_per_row); 125 } 126 buf += n_bytes_per_row; 127 memset(buf, 0, pad_bytes_per_row); 128 buf += pad_bytes_per_row; 129 ptr -= p->linesize[0]; // ... and go back 130 } 131 return n_bytes; 132} 133 134AVCodec bmp_encoder = { 135 "bmp", 136 AVMEDIA_TYPE_VIDEO, 137 CODEC_ID_BMP, 138 sizeof(BMPContext), 139 bmp_encode_init, 140 bmp_encode_frame, 141 NULL, //encode_end, 142 .pix_fmts = (const enum PixelFormat[]){ 143 PIX_FMT_BGR24, 144 PIX_FMT_RGB555, PIX_FMT_RGB565, 145 PIX_FMT_RGB8, PIX_FMT_BGR8, PIX_FMT_RGB4_BYTE, PIX_FMT_BGR4_BYTE, PIX_FMT_GRAY8, PIX_FMT_PAL8, 146 PIX_FMT_MONOBLACK, 147 PIX_FMT_NONE}, 148 .long_name = NULL_IF_CONFIG_SMALL("BMP image"), 149}; 150