Imported Debian version 2.5.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / pcxenc.c
CommitLineData
2ba45a60
DM
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://www.qzx.com/pc-gpe/pcx.txt
27 */
28
29#include "avcodec.h"
30#include "bytestream.h"
31#include "libavutil/imgutils.h"
32#include "internal.h"
33
34static const uint32_t monoblack_pal[16] = { 0x000000, 0xFFFFFF };
35
36static av_cold int pcx_encode_init(AVCodecContext *avctx)
37{
38 avctx->coded_frame = av_frame_alloc();
39 if (!avctx->coded_frame)
40 return AVERROR(ENOMEM);
41
42 avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
43 avctx->coded_frame->key_frame = 1;
44
45 return 0;
46}
47
48static av_cold int pcx_encode_close(AVCodecContext *avctx)
49{
50 av_frame_free(&avctx->coded_frame);
51 return 0;
52}
53
54/**
55 * PCX run-length encoder
56 * @param dst output buffer
57 * @param dst_size size of output buffer
58 * @param src input buffer
59 * @param src_plane_size size of one plane of input buffer in bytes
60 * @param nplanes number of planes in input buffer
61 * @return number of bytes written to dst or -1 on error
62 * @bug will not work for nplanes != 1 && bpp != 8
63 */
64static int pcx_rle_encode( uint8_t *dst, int dst_size,
65 const uint8_t *src, int src_plane_size, int nplanes)
66{
67 int p;
68 const uint8_t *dst_start = dst;
69
70 // check worst-case upper bound on dst_size
71 if (dst_size < 2LL * src_plane_size * nplanes || src_plane_size <= 0)
72 return -1;
73
74 for (p = 0; p < nplanes; p++) {
75 int count = 1;
76 const uint8_t *src_plane = src + p;
77 const uint8_t *src_plane_end = src_plane + src_plane_size * nplanes;
78 uint8_t prev = *src_plane;
79 src_plane += nplanes;
80
81 for (; ; src_plane += nplanes) {
82 if (src_plane < src_plane_end && *src_plane == prev && count < 0x3F) {
83 // current byte is same as prev
84 ++count;
85 } else {
86 // output prev * count
87 if (count != 1 || prev >= 0xC0)
88 *dst++ = 0xC0 | count;
89 *dst++ = prev;
90
91 if (src_plane == src_plane_end)
92 break;
93
94 // start new run
95 count = 1;
96 prev = *src_plane;
97 }
98 }
99 }
100
101 return dst - dst_start;
102}
103
104static int pcx_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
105 const AVFrame *frame, int *got_packet)
106{
107 const uint8_t *buf_end;
108 uint8_t *buf;
109
110 int bpp, nplanes, i, y, line_bytes, written, ret, max_pkt_size, sw, sh;
111 const uint32_t *pal = NULL;
112 uint32_t palette256[256];
113 const uint8_t *src;
114
115 if (avctx->width > 65535 || avctx->height > 65535) {
116 av_log(avctx, AV_LOG_ERROR, "image dimensions do not fit in 16 bits\n");
117 return -1;
118 }
119
120 switch (avctx->pix_fmt) {
121 case AV_PIX_FMT_RGB24:
122 bpp = 8;
123 nplanes = 3;
124 break;
125 case AV_PIX_FMT_RGB8:
126 case AV_PIX_FMT_BGR8:
127 case AV_PIX_FMT_RGB4_BYTE:
128 case AV_PIX_FMT_BGR4_BYTE:
129 case AV_PIX_FMT_GRAY8:
130 bpp = 8;
131 nplanes = 1;
132 avpriv_set_systematic_pal2(palette256, avctx->pix_fmt);
133 pal = palette256;
134 break;
135 case AV_PIX_FMT_PAL8:
136 bpp = 8;
137 nplanes = 1;
138 pal = (uint32_t *)frame->data[1];
139 break;
140 case AV_PIX_FMT_MONOBLACK:
141 bpp = 1;
142 nplanes = 1;
143 pal = monoblack_pal;
144 break;
145 default:
146 av_log(avctx, AV_LOG_ERROR, "unsupported pixfmt\n");
147 return -1;
148 }
149
150 line_bytes = (avctx->width * bpp + 7) >> 3;
151 line_bytes = (line_bytes + 1) & ~1;
152
153 max_pkt_size = 128 + avctx->height * 2 * line_bytes * nplanes + (pal ? 256*3 + 1 : 0);
154 if ((ret = ff_alloc_packet2(avctx, pkt, max_pkt_size)) < 0)
155 return ret;
156 buf = pkt->data;
157 buf_end = pkt->data + pkt->size;
158
159 sw = avctx->sample_aspect_ratio.num;
160 sh = avctx->sample_aspect_ratio.den;
161 if (sw > 0xFFFFu || sh > 0xFFFFu)
162 av_reduce(&sw, &sh, sw, sh, 0xFFFFu);
163
164 bytestream_put_byte(&buf, 10); // manufacturer
165 bytestream_put_byte(&buf, 5); // version
166 bytestream_put_byte(&buf, 1); // encoding
167 bytestream_put_byte(&buf, bpp); // bits per pixel per plane
168 bytestream_put_le16(&buf, 0); // x min
169 bytestream_put_le16(&buf, 0); // y min
170 bytestream_put_le16(&buf, avctx->width - 1); // x max
171 bytestream_put_le16(&buf, avctx->height - 1); // y max
172 bytestream_put_le16(&buf, sw); // horizontal DPI
173 bytestream_put_le16(&buf, sh); // vertical DPI
174 for (i = 0; i < 16; i++)
175 bytestream_put_be24(&buf, pal ? pal[i] : 0);// palette (<= 16 color only)
176 bytestream_put_byte(&buf, 0); // reserved
177 bytestream_put_byte(&buf, nplanes); // number of planes
178 bytestream_put_le16(&buf, line_bytes); // scanline plane size in bytes
179
180 while (buf - pkt->data < 128)
181 *buf++= 0;
182
183 src = frame->data[0];
184
185 for (y = 0; y < avctx->height; y++) {
186 if ((written = pcx_rle_encode(buf, buf_end - buf,
187 src, line_bytes, nplanes)) < 0) {
188 av_log(avctx, AV_LOG_ERROR, "buffer too small\n");
189 return -1;
190 }
191 buf += written;
192 src += frame->linesize[0];
193 }
194
195 if (nplanes == 1 && bpp == 8) {
196 if (buf_end - buf < 257) {
197 av_log(avctx, AV_LOG_ERROR, "buffer too small\n");
198 return -1;
199 }
200 bytestream_put_byte(&buf, 12);
201 for (i = 0; i < 256; i++) {
202 bytestream_put_be24(&buf, pal[i]);
203 }
204 }
205
206 pkt->size = buf - pkt->data;
207 pkt->flags |= AV_PKT_FLAG_KEY;
208 *got_packet = 1;
209
210 return 0;
211}
212
213AVCodec ff_pcx_encoder = {
214 .name = "pcx",
215 .long_name = NULL_IF_CONFIG_SMALL("PC Paintbrush PCX image"),
216 .type = AVMEDIA_TYPE_VIDEO,
217 .id = AV_CODEC_ID_PCX,
218 .init = pcx_encode_init,
219 .close = pcx_encode_close,
220 .encode2 = pcx_encode_frame,
221 .pix_fmts = (const enum AVPixelFormat[]){
222 AV_PIX_FMT_RGB24,
223 AV_PIX_FMT_RGB8, AV_PIX_FMT_BGR8, AV_PIX_FMT_RGB4_BYTE, AV_PIX_FMT_BGR4_BYTE,
224 AV_PIX_FMT_GRAY8, AV_PIX_FMT_PAL8,
225 AV_PIX_FMT_MONOBLACK,
226 AV_PIX_FMT_NONE
227 },
228};