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://www.qzx.com/pc-gpe/pcx.txt
30 #include "bytestream.h"
31 #include "libavutil/imgutils.h"
34 typedef struct PCXContext {
38 static const uint32_t monoblack_pal[16] = { 0x000000, 0xFFFFFF };
40 static av_cold int pcx_encode_init(AVCodecContext *avctx)
42 PCXContext *s = avctx->priv_data;
44 avcodec_get_frame_defaults(&s->picture);
45 avctx->coded_frame = &s->picture;
51 * PCX run-length encoder
52 * @param dst output buffer
53 * @param dst_size size of output buffer
54 * @param src input buffer
55 * @param src_plane_size size of one plane of input buffer in bytes
56 * @param nplanes number of planes in input buffer
57 * @return number of bytes written to dst or -1 on error
58 * @bug will not work for nplanes != 1 && bpp != 8
60 static int pcx_rle_encode( uint8_t *dst, int dst_size,
61 const uint8_t *src, int src_plane_size, int nplanes)
64 const uint8_t *dst_start = dst;
66 // check worst-case upper bound on dst_size
67 if (dst_size < 2LL * src_plane_size * nplanes || src_plane_size <= 0)
70 for (p = 0; p < nplanes; p++) {
72 const uint8_t *src_plane = src + p;
73 const uint8_t *src_plane_end = src_plane + src_plane_size * nplanes;
74 uint8_t prev = *src_plane;
77 for (; ; src_plane += nplanes) {
78 if (src_plane < src_plane_end && *src_plane == prev && count < 0x3F) {
79 // current byte is same as prev
82 // output prev * count
83 if (count != 1 || prev >= 0xC0)
84 *dst++ = 0xC0 | count;
87 if (src_plane == src_plane_end)
97 return dst - dst_start;
100 static int pcx_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
101 const AVFrame *frame, int *got_packet)
103 PCXContext *s = avctx->priv_data;
104 AVFrame *const pict = &s->picture;
105 const uint8_t *buf_end;
108 int bpp, nplanes, i, y, line_bytes, written, ret, max_pkt_size;
109 const uint32_t *pal = NULL;
110 uint32_t palette256[256];
114 pict->pict_type = AV_PICTURE_TYPE_I;
117 if (avctx->width > 65535 || avctx->height > 65535) {
118 av_log(avctx, AV_LOG_ERROR, "image dimensions do not fit in 16 bits\n");
122 switch (avctx->pix_fmt) {
123 case AV_PIX_FMT_RGB24:
127 case AV_PIX_FMT_RGB8:
128 case AV_PIX_FMT_BGR8:
129 case AV_PIX_FMT_RGB4_BYTE:
130 case AV_PIX_FMT_BGR4_BYTE:
131 case AV_PIX_FMT_GRAY8:
134 ff_set_systematic_pal2(palette256, avctx->pix_fmt);
137 case AV_PIX_FMT_PAL8:
140 pal = (uint32_t *)pict->data[1];
142 case AV_PIX_FMT_MONOBLACK:
148 av_log(avctx, AV_LOG_ERROR, "unsupported pixfmt\n");
152 line_bytes = (avctx->width * bpp + 7) >> 3;
153 line_bytes = (line_bytes + 1) & ~1;
155 max_pkt_size = 128 + avctx->height * 2 * line_bytes * nplanes + (pal ? 256*3 + 1 : 0);
156 if ((ret = ff_alloc_packet2(avctx, pkt, max_pkt_size)) < 0)
159 buf_end = pkt->data + pkt->size;
161 bytestream_put_byte(&buf, 10); // manufacturer
162 bytestream_put_byte(&buf, 5); // version
163 bytestream_put_byte(&buf, 1); // encoding
164 bytestream_put_byte(&buf, bpp); // bits per pixel per plane
165 bytestream_put_le16(&buf, 0); // x min
166 bytestream_put_le16(&buf, 0); // y min
167 bytestream_put_le16(&buf, avctx->width - 1); // x max
168 bytestream_put_le16(&buf, avctx->height - 1); // y max
169 bytestream_put_le16(&buf, 0); // horizontal DPI
170 bytestream_put_le16(&buf, 0); // vertical DPI
171 for (i = 0; i < 16; i++)
172 bytestream_put_be24(&buf, pal ? pal[i] : 0);// palette (<= 16 color only)
173 bytestream_put_byte(&buf, 0); // reserved
174 bytestream_put_byte(&buf, nplanes); // number of planes
175 bytestream_put_le16(&buf, line_bytes); // scanline plane size in bytes
177 while (buf - pkt->data < 128)
182 for (y = 0; y < avctx->height; y++) {
183 if ((written = pcx_rle_encode(buf, buf_end - buf,
184 src, line_bytes, nplanes)) < 0) {
185 av_log(avctx, AV_LOG_ERROR, "buffer too small\n");
189 src += pict->linesize[0];
192 if (nplanes == 1 && bpp == 8) {
193 if (buf_end - buf < 257) {
194 av_log(avctx, AV_LOG_ERROR, "buffer too small\n");
197 bytestream_put_byte(&buf, 12);
198 for (i = 0; i < 256; i++) {
199 bytestream_put_be24(&buf, pal[i]);
203 pkt->size = buf - pkt->data;
204 pkt->flags |= AV_PKT_FLAG_KEY;
210 AVCodec ff_pcx_encoder = {
212 .type = AVMEDIA_TYPE_VIDEO,
213 .id = AV_CODEC_ID_PCX,
214 .priv_data_size = sizeof(PCXContext),
215 .init = pcx_encode_init,
216 .encode2 = pcx_encode_frame,
217 .pix_fmts = (const enum AVPixelFormat[]){
219 AV_PIX_FMT_RGB8, AV_PIX_FMT_BGR8, AV_PIX_FMT_RGB4_BYTE, AV_PIX_FMT_BGR4_BYTE,
220 AV_PIX_FMT_GRAY8, AV_PIX_FMT_PAL8,
221 AV_PIX_FMT_MONOBLACK,
224 .long_name = NULL_IF_CONFIG_SMALL("PC Paintbrush PCX image"),