177 lines
6.8 KiB
C
177 lines
6.8 KiB
C
/*
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* BMP image format encoder
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* Copyright (c) 2006, 2007 Michel Bardiaux
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* Copyright (c) 2009 Daniel Verkamp <daniel at drv.nu>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/imgutils.h"
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#include "libavutil/avassert.h"
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#include "avcodec.h"
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#include "bytestream.h"
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#include "bmp.h"
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#include "internal.h"
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static const uint32_t monoblack_pal[] = { 0x000000, 0xFFFFFF };
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static const uint32_t rgb565_masks[] = { 0xF800, 0x07E0, 0x001F };
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static const uint32_t rgb444_masks[] = { 0x0F00, 0x00F0, 0x000F };
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static av_cold int bmp_encode_init(AVCodecContext *avctx){
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switch (avctx->pix_fmt) {
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case AV_PIX_FMT_BGRA:
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avctx->bits_per_coded_sample = 32;
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break;
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case AV_PIX_FMT_BGR24:
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avctx->bits_per_coded_sample = 24;
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break;
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case AV_PIX_FMT_RGB555:
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case AV_PIX_FMT_RGB565:
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case AV_PIX_FMT_RGB444:
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avctx->bits_per_coded_sample = 16;
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break;
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case AV_PIX_FMT_RGB8:
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case AV_PIX_FMT_BGR8:
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case AV_PIX_FMT_RGB4_BYTE:
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case AV_PIX_FMT_BGR4_BYTE:
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case AV_PIX_FMT_GRAY8:
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case AV_PIX_FMT_PAL8:
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avctx->bits_per_coded_sample = 8;
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break;
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case AV_PIX_FMT_MONOBLACK:
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avctx->bits_per_coded_sample = 1;
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break;
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default:
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av_log(avctx, AV_LOG_INFO, "unsupported pixel format\n");
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return AVERROR(EINVAL);
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}
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return 0;
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}
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static int bmp_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
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const AVFrame *pict, int *got_packet)
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{
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int n_bytes_image, n_bytes_per_row, n_bytes, i, n, hsize, ret;
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const uint32_t *pal = NULL;
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uint32_t palette256[256];
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int pad_bytes_per_row, pal_entries = 0, compression = BMP_RGB;
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int bit_count = avctx->bits_per_coded_sample;
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uint8_t *ptr, *buf;
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AVFrame * const p = (AVFrame *)pict;
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p->pict_type= AV_PICTURE_TYPE_I;
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p->key_frame= 1;
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switch (avctx->pix_fmt) {
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case AV_PIX_FMT_RGB444:
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compression = BMP_BITFIELDS;
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pal = rgb444_masks; // abuse pal to hold color masks
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pal_entries = 3;
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break;
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case AV_PIX_FMT_RGB565:
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compression = BMP_BITFIELDS;
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pal = rgb565_masks; // abuse pal to hold color masks
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pal_entries = 3;
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break;
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case AV_PIX_FMT_RGB8:
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case AV_PIX_FMT_BGR8:
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case AV_PIX_FMT_RGB4_BYTE:
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case AV_PIX_FMT_BGR4_BYTE:
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case AV_PIX_FMT_GRAY8:
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av_assert1(bit_count == 8);
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avpriv_set_systematic_pal2(palette256, avctx->pix_fmt);
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pal = palette256;
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break;
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case AV_PIX_FMT_PAL8:
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pal = (uint32_t *)p->data[1];
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break;
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case AV_PIX_FMT_MONOBLACK:
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pal = monoblack_pal;
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break;
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}
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if (pal && !pal_entries) pal_entries = 1 << bit_count;
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n_bytes_per_row = ((int64_t)avctx->width * (int64_t)bit_count + 7LL) >> 3LL;
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pad_bytes_per_row = (4 - n_bytes_per_row) & 3;
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n_bytes_image = avctx->height * (n_bytes_per_row + pad_bytes_per_row);
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// STRUCTURE.field refer to the MSVC documentation for BITMAPFILEHEADER
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// and related pages.
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#define SIZE_BITMAPFILEHEADER 14
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#define SIZE_BITMAPINFOHEADER 40
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hsize = SIZE_BITMAPFILEHEADER + SIZE_BITMAPINFOHEADER + (pal_entries << 2);
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n_bytes = n_bytes_image + hsize;
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if ((ret = ff_alloc_packet2(avctx, pkt, n_bytes)) < 0)
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return ret;
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buf = pkt->data;
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bytestream_put_byte(&buf, 'B'); // BITMAPFILEHEADER.bfType
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bytestream_put_byte(&buf, 'M'); // do.
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bytestream_put_le32(&buf, n_bytes); // BITMAPFILEHEADER.bfSize
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bytestream_put_le16(&buf, 0); // BITMAPFILEHEADER.bfReserved1
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bytestream_put_le16(&buf, 0); // BITMAPFILEHEADER.bfReserved2
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bytestream_put_le32(&buf, hsize); // BITMAPFILEHEADER.bfOffBits
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bytestream_put_le32(&buf, SIZE_BITMAPINFOHEADER); // BITMAPINFOHEADER.biSize
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bytestream_put_le32(&buf, avctx->width); // BITMAPINFOHEADER.biWidth
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bytestream_put_le32(&buf, avctx->height); // BITMAPINFOHEADER.biHeight
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bytestream_put_le16(&buf, 1); // BITMAPINFOHEADER.biPlanes
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bytestream_put_le16(&buf, bit_count); // BITMAPINFOHEADER.biBitCount
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bytestream_put_le32(&buf, compression); // BITMAPINFOHEADER.biCompression
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bytestream_put_le32(&buf, n_bytes_image); // BITMAPINFOHEADER.biSizeImage
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bytestream_put_le32(&buf, 0); // BITMAPINFOHEADER.biXPelsPerMeter
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bytestream_put_le32(&buf, 0); // BITMAPINFOHEADER.biYPelsPerMeter
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bytestream_put_le32(&buf, 0); // BITMAPINFOHEADER.biClrUsed
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bytestream_put_le32(&buf, 0); // BITMAPINFOHEADER.biClrImportant
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for (i = 0; i < pal_entries; i++)
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bytestream_put_le32(&buf, pal[i] & 0xFFFFFF);
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// BMP files are bottom-to-top so we start from the end...
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ptr = p->data[0] + (avctx->height - 1) * p->linesize[0];
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buf = pkt->data + hsize;
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for(i = 0; i < avctx->height; i++) {
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if (bit_count == 16) {
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const uint16_t *src = (const uint16_t *) ptr;
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uint16_t *dst = (uint16_t *) buf;
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for(n = 0; n < avctx->width; n++)
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AV_WL16(dst + n, src[n]);
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} else {
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memcpy(buf, ptr, n_bytes_per_row);
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}
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buf += n_bytes_per_row;
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memset(buf, 0, pad_bytes_per_row);
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buf += pad_bytes_per_row;
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ptr -= p->linesize[0]; // ... and go back
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}
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pkt->flags |= AV_PKT_FLAG_KEY;
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*got_packet = 1;
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return 0;
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}
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AVCodec ff_bmp_encoder = {
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.name = "bmp",
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.long_name = NULL_IF_CONFIG_SMALL("BMP (Windows and OS/2 bitmap)"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_BMP,
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.init = bmp_encode_init,
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.encode2 = bmp_encode_frame,
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.pix_fmts = (const enum AVPixelFormat[]){
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AV_PIX_FMT_BGRA, AV_PIX_FMT_BGR24,
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AV_PIX_FMT_RGB565, AV_PIX_FMT_RGB555, AV_PIX_FMT_RGB444,
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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,
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AV_PIX_FMT_MONOBLACK,
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AV_PIX_FMT_NONE
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},
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};
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