1 /*
2 * PC Paintbrush PCX (.pcx) image encoder
3 * Copyright (c) 2009 Daniel Verkamp <daniel at drv.nu>
4 *
5 * This file is part of FFmpeg.
6 *
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.
11 *
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.
16 *
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
20 */
21
22 /**
23 * @file
24 * PCX image encoder
25 * @author Daniel Verkamp
26 * @see http://bespin.org/~qz/pc-gpe/pcx.txt
27 */
28
29 #include "avcodec.h"
30 #include "bytestream.h"
31 #include "libavutil/imgutils.h"
32 #include "internal.h"
33
34 static const uint32_t monoblack_pal[16] = { 0x000000, 0xFFFFFF };
35
pcx_encode_init(AVCodecContext * avctx)36 static av_cold int pcx_encode_init(AVCodecContext *avctx)
37 {
38 #if FF_API_CODED_FRAME
39 FF_DISABLE_DEPRECATION_WARNINGS
40 avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
41 avctx->coded_frame->key_frame = 1;
42 FF_ENABLE_DEPRECATION_WARNINGS
43 #endif
44
45 return 0;
46 }
47
48 /**
49 * PCX run-length encoder
50 * @param dst output buffer
51 * @param dst_size size of output buffer
52 * @param src input buffer
53 * @param src_plane_size size of one plane of input buffer in bytes
54 * @param nplanes number of planes in input buffer
55 * @return number of bytes written to dst or -1 on error
56 * @bug will not work for nplanes != 1 && bpp != 8
57 */
pcx_rle_encode(uint8_t * dst,int dst_size,const uint8_t * src,int src_plane_size,int nplanes)58 static int pcx_rle_encode( uint8_t *dst, int dst_size,
59 const uint8_t *src, int src_plane_size, int nplanes)
60 {
61 int p;
62 const uint8_t *dst_start = dst;
63
64 // check worst-case upper bound on dst_size
65 if (dst_size < 2LL * src_plane_size * nplanes || src_plane_size <= 0)
66 return AVERROR(EINVAL);
67
68 for (p = 0; p < nplanes; p++) {
69 int count = 1;
70 const uint8_t *src_plane = src + p;
71 const uint8_t *src_plane_end = src_plane + src_plane_size * nplanes;
72 uint8_t prev = *src_plane;
73 src_plane += nplanes;
74
75 for (; ; src_plane += nplanes) {
76 if (src_plane < src_plane_end && *src_plane == prev && count < 0x3F) {
77 // current byte is same as prev
78 ++count;
79 } else {
80 // output prev * count
81 if (count != 1 || prev >= 0xC0)
82 *dst++ = 0xC0 | count;
83 *dst++ = prev;
84
85 if (src_plane == src_plane_end)
86 break;
87
88 // start new run
89 count = 1;
90 prev = *src_plane;
91 }
92 }
93 }
94
95 return dst - dst_start;
96 }
97
pcx_encode_frame(AVCodecContext * avctx,AVPacket * pkt,const AVFrame * frame,int * got_packet)98 static int pcx_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
99 const AVFrame *frame, int *got_packet)
100 {
101 const uint8_t *buf_end;
102 uint8_t *buf;
103
104 int bpp, nplanes, i, y, line_bytes, written, ret, max_pkt_size, sw, sh;
105 const uint32_t *pal = NULL;
106 uint32_t palette256[256];
107 const uint8_t *src;
108
109 if (avctx->width > 65535 || avctx->height > 65535) {
110 av_log(avctx, AV_LOG_ERROR, "image dimensions do not fit in 16 bits\n");
111 return AVERROR(EINVAL);
112 }
113
114 switch (avctx->pix_fmt) {
115 case AV_PIX_FMT_RGB24:
116 bpp = 8;
117 nplanes = 3;
118 break;
119 case AV_PIX_FMT_RGB8:
120 case AV_PIX_FMT_BGR8:
121 case AV_PIX_FMT_RGB4_BYTE:
122 case AV_PIX_FMT_BGR4_BYTE:
123 case AV_PIX_FMT_GRAY8:
124 bpp = 8;
125 nplanes = 1;
126 avpriv_set_systematic_pal2(palette256, avctx->pix_fmt);
127 pal = palette256;
128 break;
129 case AV_PIX_FMT_PAL8:
130 bpp = 8;
131 nplanes = 1;
132 pal = (uint32_t *)frame->data[1];
133 break;
134 case AV_PIX_FMT_MONOBLACK:
135 bpp = 1;
136 nplanes = 1;
137 pal = monoblack_pal;
138 break;
139 default:
140 av_log(avctx, AV_LOG_ERROR, "unsupported pixfmt\n");
141 return AVERROR(EINVAL);
142 }
143
144 line_bytes = (avctx->width * bpp + 7) >> 3;
145 line_bytes = (line_bytes + 1) & ~1;
146
147 max_pkt_size = 128 + avctx->height * 2 * line_bytes * nplanes + (pal ? 256*3 + 1 : 0);
148 if ((ret = ff_alloc_packet2(avctx, pkt, max_pkt_size, 0)) < 0)
149 return ret;
150 buf = pkt->data;
151 buf_end = pkt->data + pkt->size;
152
153 sw = avctx->sample_aspect_ratio.num;
154 sh = avctx->sample_aspect_ratio.den;
155 if (sw > 0xFFFFu || sh > 0xFFFFu)
156 av_reduce(&sw, &sh, sw, sh, 0xFFFFu);
157
158 bytestream_put_byte(&buf, 10); // manufacturer
159 bytestream_put_byte(&buf, 5); // version
160 bytestream_put_byte(&buf, 1); // encoding
161 bytestream_put_byte(&buf, bpp); // bits per pixel per plane
162 bytestream_put_le16(&buf, 0); // x min
163 bytestream_put_le16(&buf, 0); // y min
164 bytestream_put_le16(&buf, avctx->width - 1); // x max
165 bytestream_put_le16(&buf, avctx->height - 1); // y max
166 bytestream_put_le16(&buf, sw); // horizontal DPI
167 bytestream_put_le16(&buf, sh); // vertical DPI
168 for (i = 0; i < 16; i++)
169 bytestream_put_be24(&buf, pal ? pal[i] : 0);// palette (<= 16 color only)
170 bytestream_put_byte(&buf, 0); // reserved
171 bytestream_put_byte(&buf, nplanes); // number of planes
172 bytestream_put_le16(&buf, line_bytes); // scanline plane size in bytes
173
174 while (buf - pkt->data < 128)
175 *buf++= 0;
176
177 src = frame->data[0];
178
179 for (y = 0; y < avctx->height; y++) {
180 if ((written = pcx_rle_encode(buf, buf_end - buf,
181 src, line_bytes, nplanes)) < 0) {
182 av_log(avctx, AV_LOG_ERROR, "buffer too small\n");
183 return AVERROR_BUG;
184 }
185 buf += written;
186 src += frame->linesize[0];
187 }
188
189 if (nplanes == 1 && bpp == 8) {
190 if (buf_end - buf < 257) {
191 av_log(avctx, AV_LOG_ERROR, "buffer too small\n");
192 return AVERROR_BUG;
193 }
194 bytestream_put_byte(&buf, 12);
195 for (i = 0; i < 256; i++) {
196 bytestream_put_be24(&buf, pal[i]);
197 }
198 }
199
200 pkt->size = buf - pkt->data;
201 pkt->flags |= AV_PKT_FLAG_KEY;
202 *got_packet = 1;
203
204 return 0;
205 }
206
207 AVCodec ff_pcx_encoder = {
208 .name = "pcx",
209 .long_name = NULL_IF_CONFIG_SMALL("PC Paintbrush PCX image"),
210 .type = AVMEDIA_TYPE_VIDEO,
211 .id = AV_CODEC_ID_PCX,
212 .init = pcx_encode_init,
213 .encode2 = pcx_encode_frame,
214 .pix_fmts = (const enum AVPixelFormat[]){
215 AV_PIX_FMT_RGB24,
216 AV_PIX_FMT_RGB8, AV_PIX_FMT_BGR8, AV_PIX_FMT_RGB4_BYTE, AV_PIX_FMT_BGR4_BYTE,
217 AV_PIX_FMT_GRAY8, AV_PIX_FMT_PAL8,
218 AV_PIX_FMT_MONOBLACK,
219 AV_PIX_FMT_NONE
220 },
221 };
222