2 * PC Paintbrush PCX (.pcx) image encoder
3 * Copyright (c) 2009 Daniel Verkamp <daniel at drv.nu>
5 * This file is part of Libav.
7 * Libav 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 * Libav 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 Libav; 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"
33 static const uint32_t monoblack_pal[16] = { 0x000000, 0xFFFFFF };
35 static av_cold int pcx_encode_init(AVCodecContext *avctx)
37 #if FF_API_CODED_FRAME
38 FF_DISABLE_DEPRECATION_WARNINGS
39 avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
40 avctx->coded_frame->key_frame = 1;
41 FF_ENABLE_DEPRECATION_WARNINGS
48 * PCX run-length encoder
49 * @param dst output buffer
50 * @param dst_size size of output buffer
51 * @param src input buffer
52 * @param src_plane_size size of one plane of input buffer in bytes
53 * @param nplanes number of planes in input buffer
54 * @return number of bytes written to dst or -1 on error
55 * @bug will not work for nplanes != 1 && bpp != 8
57 static int pcx_rle_encode( uint8_t *dst, int dst_size,
58 const uint8_t *src, int src_plane_size, int nplanes)
61 const uint8_t *dst_start = dst;
63 // check worst-case upper bound on dst_size
64 if (dst_size < 2LL * src_plane_size * nplanes || src_plane_size <= 0)
65 return AVERROR(EINVAL);
67 for (p = 0; p < nplanes; p++) {
69 const uint8_t *src_plane = src + p;
70 const uint8_t *src_plane_end = src_plane + src_plane_size * nplanes;
71 uint8_t prev = *src_plane;
74 for (; ; src_plane += nplanes) {
75 if (src_plane < src_plane_end && *src_plane == prev && count < 0x3F) {
76 // current byte is same as prev
79 // output prev * count
80 if (count != 1 || prev >= 0xC0)
81 *dst++ = 0xC0 | count;
84 if (src_plane == src_plane_end)
94 return dst - dst_start;
97 static int pcx_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
98 const AVFrame *frame, int *got_packet)
100 const uint8_t *buf_end;
103 int bpp, nplanes, i, y, line_bytes, written, ret, max_pkt_size;
104 const uint32_t *pal = NULL;
107 if (avctx->width > 65535 || avctx->height > 65535) {
108 av_log(avctx, AV_LOG_ERROR, "image dimensions do not fit in 16 bits\n");
109 return AVERROR(EINVAL);
112 switch (avctx->pix_fmt) {
113 case AV_PIX_FMT_RGB24:
117 case AV_PIX_FMT_RGB8:
118 case AV_PIX_FMT_BGR8:
119 case AV_PIX_FMT_RGB4_BYTE:
120 case AV_PIX_FMT_BGR4_BYTE:
121 case AV_PIX_FMT_GRAY8:
122 case AV_PIX_FMT_PAL8:
125 pal = (uint32_t *)frame->data[1];
127 case AV_PIX_FMT_MONOBLACK:
133 av_log(avctx, AV_LOG_ERROR, "unsupported pixfmt\n");
134 return AVERROR(EINVAL);
137 line_bytes = (avctx->width * bpp + 7) >> 3;
138 line_bytes = (line_bytes + 1) & ~1;
140 max_pkt_size = 128 + avctx->height * 2 * line_bytes * nplanes + (pal ? 256*3 + 1 : 0);
141 if ((ret = ff_alloc_packet(pkt, max_pkt_size)) < 0) {
142 av_log(avctx, AV_LOG_ERROR, "Error getting output packet of size %d.\n", max_pkt_size);
146 buf_end = pkt->data + pkt->size;
148 bytestream_put_byte(&buf, 10); // manufacturer
149 bytestream_put_byte(&buf, 5); // version
150 bytestream_put_byte(&buf, 1); // encoding
151 bytestream_put_byte(&buf, bpp); // bits per pixel per plane
152 bytestream_put_le16(&buf, 0); // x min
153 bytestream_put_le16(&buf, 0); // y min
154 bytestream_put_le16(&buf, avctx->width - 1); // x max
155 bytestream_put_le16(&buf, avctx->height - 1); // y max
156 bytestream_put_le16(&buf, 0); // horizontal DPI
157 bytestream_put_le16(&buf, 0); // vertical DPI
158 for (i = 0; i < 16; i++)
159 bytestream_put_be24(&buf, pal ? pal[i] : 0);// palette (<= 16 color only)
160 bytestream_put_byte(&buf, 0); // reserved
161 bytestream_put_byte(&buf, nplanes); // number of planes
162 bytestream_put_le16(&buf, line_bytes); // scanline plane size in bytes
164 while (buf - pkt->data < 128)
167 src = frame->data[0];
169 for (y = 0; y < avctx->height; y++) {
170 if ((written = pcx_rle_encode(buf, buf_end - buf,
171 src, line_bytes, nplanes)) < 0) {
172 av_log(avctx, AV_LOG_ERROR, "buffer too small\n");
176 src += frame->linesize[0];
179 if (nplanes == 1 && bpp == 8) {
180 if (buf_end - buf < 257) {
181 av_log(avctx, AV_LOG_ERROR, "buffer too small\n");
184 bytestream_put_byte(&buf, 12);
185 for (i = 0; i < 256; i++) {
186 bytestream_put_be24(&buf, pal[i]);
190 pkt->size = buf - pkt->data;
191 pkt->flags |= AV_PKT_FLAG_KEY;
197 AVCodec ff_pcx_encoder = {
199 .long_name = NULL_IF_CONFIG_SMALL("PC Paintbrush PCX image"),
200 .type = AVMEDIA_TYPE_VIDEO,
201 .id = AV_CODEC_ID_PCX,
202 .init = pcx_encode_init,
203 .encode2 = pcx_encode_frame,
204 .pix_fmts = (const enum AVPixelFormat[]){
206 AV_PIX_FMT_RGB8, AV_PIX_FMT_BGR8, AV_PIX_FMT_RGB4_BYTE, AV_PIX_FMT_BGR4_BYTE,
207 AV_PIX_FMT_GRAY8, AV_PIX_FMT_PAL8,
208 AV_PIX_FMT_MONOBLACK,