diff options
Diffstat (limited to 'ffmpeg/libavcodec/bmpenc.c')
| -rw-r--r-- | ffmpeg/libavcodec/bmpenc.c | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/ffmpeg/libavcodec/bmpenc.c b/ffmpeg/libavcodec/bmpenc.c new file mode 100644 index 0000000..bda6799 --- /dev/null +++ b/ffmpeg/libavcodec/bmpenc.c @@ -0,0 +1,183 @@ +/* + * BMP image format encoder + * Copyright (c) 2006, 2007 Michel Bardiaux + * Copyright (c) 2009 Daniel Verkamp <daniel at drv.nu> + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include "libavutil/imgutils.h" +#include "libavutil/avassert.h" +#include "avcodec.h" +#include "bytestream.h" +#include "bmp.h" +#include "internal.h" + +static const uint32_t monoblack_pal[] = { 0x000000, 0xFFFFFF }; +static const uint32_t rgb565_masks[] = { 0xF800, 0x07E0, 0x001F }; +static const uint32_t rgb444_masks[] = { 0x0F00, 0x00F0, 0x000F }; + +static av_cold int bmp_encode_init(AVCodecContext *avctx){ + BMPContext *s = avctx->priv_data; + + avcodec_get_frame_defaults(&s->picture); + avctx->coded_frame = &s->picture; + + switch (avctx->pix_fmt) { + case AV_PIX_FMT_BGRA: + avctx->bits_per_coded_sample = 32; + break; + case AV_PIX_FMT_BGR24: + avctx->bits_per_coded_sample = 24; + break; + case AV_PIX_FMT_RGB555: + case AV_PIX_FMT_RGB565: + case AV_PIX_FMT_RGB444: + avctx->bits_per_coded_sample = 16; + break; + case AV_PIX_FMT_RGB8: + case AV_PIX_FMT_BGR8: + case AV_PIX_FMT_RGB4_BYTE: + case AV_PIX_FMT_BGR4_BYTE: + case AV_PIX_FMT_GRAY8: + case AV_PIX_FMT_PAL8: + avctx->bits_per_coded_sample = 8; + break; + case AV_PIX_FMT_MONOBLACK: + avctx->bits_per_coded_sample = 1; + break; + default: + av_log(avctx, AV_LOG_INFO, "unsupported pixel format\n"); + return -1; + } + + return 0; +} + +static int bmp_encode_frame(AVCodecContext *avctx, AVPacket *pkt, + const AVFrame *pict, int *got_packet) +{ + BMPContext *s = avctx->priv_data; + AVFrame * const p = &s->picture; + int n_bytes_image, n_bytes_per_row, n_bytes, i, n, hsize, ret; + const uint32_t *pal = NULL; + uint32_t palette256[256]; + int pad_bytes_per_row, pal_entries = 0, compression = BMP_RGB; + int bit_count = avctx->bits_per_coded_sample; + uint8_t *ptr, *buf; + *p = *pict; + p->pict_type= AV_PICTURE_TYPE_I; + p->key_frame= 1; + switch (avctx->pix_fmt) { + case AV_PIX_FMT_RGB444: + compression = BMP_BITFIELDS; + pal = rgb444_masks; // abuse pal to hold color masks + pal_entries = 3; + break; + case AV_PIX_FMT_RGB565: + compression = BMP_BITFIELDS; + pal = rgb565_masks; // abuse pal to hold color masks + pal_entries = 3; + break; + case AV_PIX_FMT_RGB8: + case AV_PIX_FMT_BGR8: + case AV_PIX_FMT_RGB4_BYTE: + case AV_PIX_FMT_BGR4_BYTE: + case AV_PIX_FMT_GRAY8: + av_assert1(bit_count == 8); + avpriv_set_systematic_pal2(palette256, avctx->pix_fmt); + pal = palette256; + break; + case AV_PIX_FMT_PAL8: + pal = (uint32_t *)p->data[1]; + break; + case AV_PIX_FMT_MONOBLACK: + pal = monoblack_pal; + break; + } + if (pal && !pal_entries) pal_entries = 1 << bit_count; + n_bytes_per_row = ((int64_t)avctx->width * (int64_t)bit_count + 7LL) >> 3LL; + pad_bytes_per_row = (4 - n_bytes_per_row) & 3; + n_bytes_image = avctx->height * (n_bytes_per_row + pad_bytes_per_row); + + // STRUCTURE.field refer to the MSVC documentation for BITMAPFILEHEADER + // and related pages. +#define SIZE_BITMAPFILEHEADER 14 +#define SIZE_BITMAPINFOHEADER 40 + hsize = SIZE_BITMAPFILEHEADER + SIZE_BITMAPINFOHEADER + (pal_entries << 2); + n_bytes = n_bytes_image + hsize; + if ((ret = ff_alloc_packet2(avctx, pkt, n_bytes)) < 0) + return ret; + buf = pkt->data; + bytestream_put_byte(&buf, 'B'); // BITMAPFILEHEADER.bfType + bytestream_put_byte(&buf, 'M'); // do. + bytestream_put_le32(&buf, n_bytes); // BITMAPFILEHEADER.bfSize + bytestream_put_le16(&buf, 0); // BITMAPFILEHEADER.bfReserved1 + bytestream_put_le16(&buf, 0); // BITMAPFILEHEADER.bfReserved2 + bytestream_put_le32(&buf, hsize); // BITMAPFILEHEADER.bfOffBits + bytestream_put_le32(&buf, SIZE_BITMAPINFOHEADER); // BITMAPINFOHEADER.biSize + bytestream_put_le32(&buf, avctx->width); // BITMAPINFOHEADER.biWidth + bytestream_put_le32(&buf, avctx->height); // BITMAPINFOHEADER.biHeight + bytestream_put_le16(&buf, 1); // BITMAPINFOHEADER.biPlanes + bytestream_put_le16(&buf, bit_count); // BITMAPINFOHEADER.biBitCount + bytestream_put_le32(&buf, compression); // BITMAPINFOHEADER.biCompression + bytestream_put_le32(&buf, n_bytes_image); // BITMAPINFOHEADER.biSizeImage + bytestream_put_le32(&buf, 0); // BITMAPINFOHEADER.biXPelsPerMeter + bytestream_put_le32(&buf, 0); // BITMAPINFOHEADER.biYPelsPerMeter + bytestream_put_le32(&buf, 0); // BITMAPINFOHEADER.biClrUsed + bytestream_put_le32(&buf, 0); // BITMAPINFOHEADER.biClrImportant + for (i = 0; i < pal_entries; i++) + bytestream_put_le32(&buf, pal[i] & 0xFFFFFF); + // BMP files are bottom-to-top so we start from the end... + ptr = p->data[0] + (avctx->height - 1) * p->linesize[0]; + buf = pkt->data + hsize; + for(i = 0; i < avctx->height; i++) { + if (bit_count == 16) { + const uint16_t *src = (const uint16_t *) ptr; + uint16_t *dst = (uint16_t *) buf; + for(n = 0; n < avctx->width; n++) + AV_WL16(dst + n, src[n]); + } else { + memcpy(buf, ptr, n_bytes_per_row); + } + buf += n_bytes_per_row; + memset(buf, 0, pad_bytes_per_row); + buf += pad_bytes_per_row; + ptr -= p->linesize[0]; // ... and go back + } + + pkt->flags |= AV_PKT_FLAG_KEY; + *got_packet = 1; + return 0; +} + +AVCodec ff_bmp_encoder = { + .name = "bmp", + .type = AVMEDIA_TYPE_VIDEO, + .id = AV_CODEC_ID_BMP, + .priv_data_size = sizeof(BMPContext), + .init = bmp_encode_init, + .encode2 = bmp_encode_frame, + .pix_fmts = (const enum AVPixelFormat[]){ + AV_PIX_FMT_BGRA, AV_PIX_FMT_BGR24, + AV_PIX_FMT_RGB565, AV_PIX_FMT_RGB555, AV_PIX_FMT_RGB444, + 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, + AV_PIX_FMT_MONOBLACK, + AV_PIX_FMT_NONE + }, + .long_name = NULL_IF_CONFIG_SMALL("BMP (Windows and OS/2 bitmap)"), +}; 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