2 * PC Paintbrush PCX (.pcx) image encoder
3 * Copyright (c) 2009 Daniel Verkamp <daniel at drv.nu>
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
25 * @author Daniel Verkamp
26 * @see http://bespin.org/~qz/pc-gpe/pcx.txt
30 #include "bytestream.h"
31 #include "libavutil/imgutils.h"
34 static const uint32_t monoblack_pal[16] = { 0x000000, 0xFFFFFF };
37 * PCX run-length encoder
38 * @param dst output buffer
39 * @param dst_size size of output buffer
40 * @param src input buffer
41 * @param src_plane_size size of one plane of input buffer in bytes
42 * @param nplanes number of planes in input buffer
43 * @return number of bytes written to dst or -1 on error
44 * @bug will not work for nplanes != 1 && bpp != 8
46 static int pcx_rle_encode( uint8_t *dst, int dst_size,
47 const uint8_t *src, int src_plane_size, int nplanes)
50 const uint8_t *dst_start = dst;
52 // check worst-case upper bound on dst_size
53 if (dst_size < 2LL * src_plane_size * nplanes || src_plane_size <= 0)
54 return AVERROR(EINVAL);
56 for (p = 0; p < nplanes; p++) {
58 const uint8_t *src_plane = src + p;
59 const uint8_t *src_plane_end = src_plane + src_plane_size * nplanes;
60 uint8_t prev = *src_plane;
63 for (; ; src_plane += nplanes) {
64 if (src_plane < src_plane_end && *src_plane == prev && count < 0x3F) {
65 // current byte is same as prev
68 // output prev * count
69 if (count != 1 || prev >= 0xC0)
70 *dst++ = 0xC0 | count;
73 if (src_plane == src_plane_end)
83 return dst - dst_start;
86 static int pcx_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
87 const AVFrame *frame, int *got_packet)
89 const uint8_t *buf_end;
92 int bpp, nplanes, i, y, line_bytes, written, ret, max_pkt_size, sw, sh;
93 const uint32_t *pal = NULL;
94 uint32_t palette256[256];
97 if (avctx->width > 65535 || avctx->height > 65535) {
98 av_log(avctx, AV_LOG_ERROR, "image dimensions do not fit in 16 bits\n");
99 return AVERROR(EINVAL);
102 switch (avctx->pix_fmt) {
103 case AV_PIX_FMT_RGB24:
107 case AV_PIX_FMT_RGB8:
108 case AV_PIX_FMT_BGR8:
109 case AV_PIX_FMT_RGB4_BYTE:
110 case AV_PIX_FMT_BGR4_BYTE:
111 case AV_PIX_FMT_GRAY8:
114 avpriv_set_systematic_pal2(palette256, avctx->pix_fmt);
117 case AV_PIX_FMT_PAL8:
120 pal = (uint32_t *)frame->data[1];
122 case AV_PIX_FMT_MONOBLACK:
128 av_log(avctx, AV_LOG_ERROR, "unsupported pixfmt\n");
129 return AVERROR(EINVAL);
132 line_bytes = (avctx->width * bpp + 7) >> 3;
133 line_bytes = (line_bytes + 1) & ~1;
135 max_pkt_size = 128 + avctx->height * 2 * line_bytes * nplanes + (pal ? 256*3 + 1 : 0);
136 if ((ret = ff_alloc_packet2(avctx, pkt, max_pkt_size, 0)) < 0)
139 buf_end = pkt->data + pkt->size;
141 sw = avctx->sample_aspect_ratio.num;
142 sh = avctx->sample_aspect_ratio.den;
143 if (sw > 0xFFFFu || sh > 0xFFFFu)
144 av_reduce(&sw, &sh, sw, sh, 0xFFFFu);
146 bytestream_put_byte(&buf, 10); // manufacturer
147 bytestream_put_byte(&buf, 5); // version
148 bytestream_put_byte(&buf, 1); // encoding
149 bytestream_put_byte(&buf, bpp); // bits per pixel per plane
150 bytestream_put_le16(&buf, 0); // x min
151 bytestream_put_le16(&buf, 0); // y min
152 bytestream_put_le16(&buf, avctx->width - 1); // x max
153 bytestream_put_le16(&buf, avctx->height - 1); // y max
154 bytestream_put_le16(&buf, sw); // horizontal DPI
155 bytestream_put_le16(&buf, sh); // vertical DPI
156 for (i = 0; i < 16; i++)
157 bytestream_put_be24(&buf, pal ? pal[i] : 0);// palette (<= 16 color only)
158 bytestream_put_byte(&buf, 0); // reserved
159 bytestream_put_byte(&buf, nplanes); // number of planes
160 bytestream_put_le16(&buf, line_bytes); // scanline plane size in bytes
162 while (buf - pkt->data < 128)
165 src = frame->data[0];
167 for (y = 0; y < avctx->height; y++) {
168 if ((written = pcx_rle_encode(buf, buf_end - buf,
169 src, line_bytes, nplanes)) < 0) {
170 av_log(avctx, AV_LOG_ERROR, "buffer too small\n");
174 src += frame->linesize[0];
177 if (nplanes == 1 && bpp == 8) {
178 if (buf_end - buf < 257) {
179 av_log(avctx, AV_LOG_ERROR, "buffer too small\n");
182 bytestream_put_byte(&buf, 12);
183 for (i = 0; i < 256; i++) {
184 bytestream_put_be24(&buf, pal[i]);
188 pkt->size = buf - pkt->data;
189 pkt->flags |= AV_PKT_FLAG_KEY;
195 AVCodec ff_pcx_encoder = {
197 .long_name = NULL_IF_CONFIG_SMALL("PC Paintbrush PCX image"),
198 .type = AVMEDIA_TYPE_VIDEO,
199 .id = AV_CODEC_ID_PCX,
200 .encode2 = pcx_encode_frame,
201 .pix_fmts = (const enum AVPixelFormat[]){
203 AV_PIX_FMT_RGB8, AV_PIX_FMT_BGR8, AV_PIX_FMT_RGB4_BYTE, AV_PIX_FMT_BGR4_BYTE,
204 AV_PIX_FMT_GRAY8, AV_PIX_FMT_PAL8,
205 AV_PIX_FMT_MONOBLACK,