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20f9727018
Up until now, codec.h contains both public and private parts of AVCodec. This exposes the internals of AVCodec to users and leads them into the temptation of actually using them and forces us to forward-declare structures and types that users can't use at all. This commit changes this by adding a new structure FFCodec to codec_internal.h that extends AVCodec, i.e. contains the public AVCodec as first member; the private fields of AVCodec are moved to this structure, leaving codec.h clean. Reviewed-by: Anton Khirnov <anton@khirnov.net> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
175 lines
6.7 KiB
C
175 lines
6.7 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 "config.h"
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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 "codec_internal.h"
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#include "encode.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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}
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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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const AVFrame * const p = pict;
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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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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_get_encode_buffer(avctx, pkt, n_bytes, 0)) < 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 (HAVE_BIGENDIAN && bit_count == 16) {
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const uint16_t *src = (const uint16_t *) ptr;
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for(n = 0; n < avctx->width; n++)
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AV_WL16(buf + 2 * 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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*got_packet = 1;
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return 0;
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}
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const FFCodec ff_bmp_encoder = {
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.p.name = "bmp",
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.p.long_name = NULL_IF_CONFIG_SMALL("BMP (Windows and OS/2 bitmap)"),
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.p.type = AVMEDIA_TYPE_VIDEO,
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.p.id = AV_CODEC_ID_BMP,
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.p.capabilities = AV_CODEC_CAP_DR1,
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.init = bmp_encode_init,
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.encode2 = bmp_encode_frame,
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.p.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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.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
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};
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