From effcedf738a9afd7056643eaba44a626f1ee82bf Mon Sep 17 00:00:00 2001 From: Daniel Verkamp Date: Fri, 20 Mar 2009 17:23:45 +0000 Subject: PCX encoder that handles 1-, 8-, and 24-bpp pixfmts. Patch by Daniel Verkamp, daniel drv nu Originally committed as revision 18077 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavcodec/pcxenc.c | 206 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 206 insertions(+) create mode 100644 libavcodec/pcxenc.c (limited to 'libavcodec/pcxenc.c') diff --git a/libavcodec/pcxenc.c b/libavcodec/pcxenc.c new file mode 100644 index 0000000000..36f7d1d84c --- /dev/null +++ b/libavcodec/pcxenc.c @@ -0,0 +1,206 @@ +/* + * PC Paintbrush PCX (.pcx) image encoder + * Copyright (c) 2009 Daniel Verkamp + * + * 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 + */ + +/** + * PCX image encoder + * @file libavcodec/pcxenc.c + * @author Daniel Verkamp + * @sa http://www.qzx.com/pc-gpe/pcx.txt + */ + +#include "avcodec.h" +#include "bytestream.h" + +typedef struct PCXContext { + AVFrame picture; +} PCXContext; + +static const uint32_t monoblack_pal[] = { 0x000000, 0xFFFFFF }; + +static av_cold int pcx_encode_init(AVCodecContext *avctx) +{ + PCXContext *s = avctx->priv_data; + + avcodec_get_frame_defaults(&s->picture); + avctx->coded_frame = &s->picture; + + return 0; +} + +/** + * PCX run-length encoder + * @param dst output buffer + * @param dst_size size of output buffer + * @param src input buffer + * @param src_plane_size size of one plane of input buffer in bytes + * @param nplanes number of planes in input buffer + * @return number of bytes written to dst or -1 on error + * @bug will not work for nplanes != 1 && bpp != 8 + */ +static int pcx_rle_encode( uint8_t *dst, int dst_size, + const uint8_t *src, int src_plane_size, int nplanes) +{ + int p; + const uint8_t *dst_start = dst; + + // check worst-case upper bound on dst_size + if (dst_size < 2LL * src_plane_size * nplanes || src_plane_size <= 0) + return -1; + + for (p = 0; p < nplanes; p++) { + int count = 1; + const uint8_t *src_plane = src + p; + const uint8_t *src_plane_end = src_plane + src_plane_size * nplanes; + uint8_t prev = *src_plane; + src_plane += nplanes; + + for (; ; src_plane += nplanes) { + if (src_plane < src_plane_end && *src_plane == prev && count < 0x3F) { + // current byte is same as prev + ++count; + } else { + // output prev * count + if (count != 1 || prev >= 0xC0) + *dst++ = 0xC0 | count; + *dst++ = prev; + + if (src_plane == src_plane_end) + break; + + // start new run + count = 1; + prev = *src_plane; + } + } + } + + return dst - dst_start; +} + +static int pcx_encode_frame(AVCodecContext *avctx, + unsigned char *buf, int buf_size, void *data) +{ + PCXContext *s = avctx->priv_data; + AVFrame *const pict = &s->picture; + const uint8_t *buf_start = buf; + const uint8_t *buf_end = buf + buf_size; + + int bpp, nplanes, i, y, line_bytes, written; + const uint32_t *pal = NULL; + const uint8_t *src; + + *pict = *(AVFrame *)data; + pict->pict_type = FF_I_TYPE; + pict->key_frame = 1; + + if (avctx->width > 65535 || avctx->height > 65535) { + av_log(avctx, AV_LOG_ERROR, "image dimensions do not fit in 16 bits\n"); + return -1; + } + + switch (avctx->pix_fmt) { + case PIX_FMT_RGB24: + bpp = 8; + nplanes = 3; + break; + case PIX_FMT_RGB8: + case PIX_FMT_BGR8: + case PIX_FMT_RGB4_BYTE: + case PIX_FMT_BGR4_BYTE: + case PIX_FMT_GRAY8: + case PIX_FMT_PAL8: + bpp = 8; + nplanes = 1; + pal = (uint32_t *)pict->data[1]; + break; + case PIX_FMT_MONOBLACK: + bpp = 1; + nplanes = 1; + pal = monoblack_pal; + break; + default: + av_log(avctx, AV_LOG_ERROR, "unsupported pixfmt\n"); + return -1; + } + + line_bytes = (avctx->width * bpp + 7) >> 3; + line_bytes = (line_bytes + 1) & ~1; + + bytestream_put_byte(&buf, 10); // manufacturer + bytestream_put_byte(&buf, 5); // version + bytestream_put_byte(&buf, 1); // encoding + bytestream_put_byte(&buf, bpp); // bits per pixel per plane + bytestream_put_le16(&buf, 0); // x min + bytestream_put_le16(&buf, 0); // y min + bytestream_put_le16(&buf, avctx->width - 1); // x max + bytestream_put_le16(&buf, avctx->height - 1); // y max + bytestream_put_le16(&buf, 0); // horizontal DPI + bytestream_put_le16(&buf, 0); // vertical DPI + for (i = 0; i < 16; i++) + bytestream_put_be24(&buf, pal ? pal[i] : 0);// palette (<= 16 color only) + bytestream_put_byte(&buf, 0); // reserved + bytestream_put_byte(&buf, nplanes); // number of planes + bytestream_put_le16(&buf, line_bytes); // scanline plane size in bytes + + while (buf - buf_start < 128) + *buf++= 0; + + src = pict->data[0]; + + for (y = 0; y < avctx->height; y++) { + if ((written = pcx_rle_encode(buf, buf_end - buf, + src, line_bytes, nplanes)) < 0) { + av_log(avctx, AV_LOG_ERROR, "buffer too small\n"); + return -1; + } + buf += written; + src += pict->linesize[0]; + } + + if (nplanes == 1 && bpp == 8) { + if (buf_end - buf < 257) { + av_log(avctx, AV_LOG_ERROR, "buffer too small\n"); + return -1; + } + bytestream_put_byte(&buf, 12); + for (i = 0; i < 256; i++) { + bytestream_put_be24(&buf, pal[i]); + } + } + + return buf - buf_start; +} + +AVCodec pcx_encoder = { + "pcx", + CODEC_TYPE_VIDEO, + CODEC_ID_PCX, + sizeof(PCXContext), + pcx_encode_init, + pcx_encode_frame, + NULL, + .pix_fmts = (enum PixelFormat[]){ + PIX_FMT_RGB24, + PIX_FMT_RGB8, PIX_FMT_BGR8, PIX_FMT_RGB4_BYTE, PIX_FMT_BGR4_BYTE, PIX_FMT_GRAY8, PIX_FMT_PAL8, + PIX_FMT_MONOBLACK, + PIX_FMT_NONE}, + .long_name = NULL_IF_CONFIG_SMALL("PC Paintbrush PCX image"), +}; -- cgit v1.2.3