Merge branch 'mirror' into vdpau
[FFMpeg-mirror/ffmpeg-vdpau.git] / libavcodec / pcx.c
blobbf80e437fef8af660dde649bac0a3722c14adbf8
1 /*
2 * PC Paintbrush PCX (.pcx) image decoder
3 * Copyright (c) 2007, 2008 Ivo van Poorten
5 * This decoder does not support CGA palettes. I am unable to find samples
6 * and Netpbm cannot generate them.
8 * This file is part of FFmpeg.
10 * FFmpeg is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU Lesser General Public
12 * License as published by the Free Software Foundation; either
13 * version 2.1 of the License, or (at your option) any later version.
15 * FFmpeg is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * Lesser General Public License for more details.
20 * You should have received a copy of the GNU Lesser General Public
21 * License along with FFmpeg; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
25 #include "avcodec.h"
26 #include "bytestream.h"
27 #include "bitstream.h"
29 typedef struct PCXContext {
30 AVFrame picture;
31 } PCXContext;
33 static av_cold int pcx_init(AVCodecContext *avctx) {
34 PCXContext *s = avctx->priv_data;
36 avcodec_get_frame_defaults(&s->picture);
37 avctx->coded_frame= &s->picture;
39 return 0;
42 /**
43 * @return advanced src pointer
45 static const uint8_t *pcx_rle_decode(const uint8_t *src, uint8_t *dst,
46 unsigned int bytes_per_scanline) {
47 unsigned int i = 0;
48 unsigned char run, value;
50 while (i<bytes_per_scanline) {
51 run = 1;
52 value = *src++;
53 if (value >= 0xc0) {
54 run = value & 0x3f;
55 value = *src++;
57 while (i<bytes_per_scanline && run--)
58 dst[i++] = value;
61 return src;
64 static void pcx_palette(const uint8_t **src, uint32_t *dst, unsigned int pallen) {
65 unsigned int i;
67 for (i=0; i<pallen; i++)
68 *dst++ = bytestream_get_be24(src);
69 memset(dst, 0, (256 - pallen) * sizeof(*dst));
72 static int pcx_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
73 const uint8_t *buf, int buf_size) {
74 PCXContext * const s = avctx->priv_data;
75 AVFrame *picture = data;
76 AVFrame * const p = &s->picture;
77 int xmin, ymin, xmax, ymax;
78 unsigned int w, h, bits_per_pixel, bytes_per_line, nplanes, stride, y, x,
79 bytes_per_scanline;
80 uint8_t *ptr;
81 uint8_t const *bufstart = buf;
83 if (buf[0] != 0x0a || buf[1] > 5 || buf[1] == 1 || buf[2] != 1) {
84 av_log(avctx, AV_LOG_ERROR, "this is not PCX encoded data\n");
85 return -1;
88 xmin = AV_RL16(buf+ 4);
89 ymin = AV_RL16(buf+ 6);
90 xmax = AV_RL16(buf+ 8);
91 ymax = AV_RL16(buf+10);
93 if (xmax < xmin || ymax < ymin) {
94 av_log(avctx, AV_LOG_ERROR, "invalid image dimensions\n");
95 return -1;
98 w = xmax - xmin + 1;
99 h = ymax - ymin + 1;
101 bits_per_pixel = buf[3];
102 bytes_per_line = AV_RL16(buf+66);
103 nplanes = buf[65];
104 bytes_per_scanline = nplanes * bytes_per_line;
106 if (bytes_per_scanline < w * bits_per_pixel * nplanes / 8) {
107 av_log(avctx, AV_LOG_ERROR, "PCX data is corrupted\n");
108 return -1;
111 switch ((nplanes<<8) + bits_per_pixel) {
112 case 0x0308:
113 avctx->pix_fmt = PIX_FMT_RGB24;
114 break;
115 case 0x0108:
116 case 0x0104:
117 case 0x0102:
118 case 0x0101:
119 case 0x0401:
120 case 0x0301:
121 case 0x0201:
122 avctx->pix_fmt = PIX_FMT_PAL8;
123 break;
124 default:
125 av_log(avctx, AV_LOG_ERROR, "invalid PCX file\n");
126 return -1;
129 buf += 128;
131 if (p->data[0])
132 avctx->release_buffer(avctx, p);
134 if (avcodec_check_dimensions(avctx, w, h))
135 return -1;
136 if (w != avctx->width || h != avctx->height)
137 avcodec_set_dimensions(avctx, w, h);
138 if (avctx->get_buffer(avctx, p) < 0) {
139 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
140 return -1;
143 p->pict_type = FF_I_TYPE;
145 ptr = p->data[0];
146 stride = p->linesize[0];
148 if (nplanes == 3 && bits_per_pixel == 8) {
149 uint8_t scanline[bytes_per_scanline];
151 for (y=0; y<h; y++) {
152 buf = pcx_rle_decode(buf, scanline, bytes_per_scanline);
154 for (x=0; x<w; x++) {
155 ptr[3*x ] = scanline[x ];
156 ptr[3*x+1] = scanline[x+ bytes_per_line ];
157 ptr[3*x+2] = scanline[x+(bytes_per_line<<1)];
160 ptr += stride;
163 } else if (nplanes == 1 && bits_per_pixel == 8) {
164 uint8_t scanline[bytes_per_scanline];
165 const uint8_t *palstart = bufstart + buf_size - 769;
167 for (y=0; y<h; y++, ptr+=stride) {
168 buf = pcx_rle_decode(buf, scanline, bytes_per_scanline);
169 memcpy(ptr, scanline, w);
172 if (buf != palstart) {
173 av_log(avctx, AV_LOG_WARNING, "image data possibly corrupted\n");
174 buf = palstart;
176 if (*buf++ != 12) {
177 av_log(avctx, AV_LOG_ERROR, "expected palette after image data\n");
178 return -1;
181 } else if (nplanes == 1) { /* all packed formats, max. 16 colors */
182 uint8_t scanline[bytes_per_scanline];
183 GetBitContext s;
185 for (y=0; y<h; y++) {
186 init_get_bits(&s, scanline, bytes_per_scanline<<3);
188 buf = pcx_rle_decode(buf, scanline, bytes_per_scanline);
190 for (x=0; x<w; x++)
191 ptr[x] = get_bits(&s, bits_per_pixel);
192 ptr += stride;
195 } else { /* planar, 4, 8 or 16 colors */
196 uint8_t scanline[bytes_per_scanline];
197 int i;
199 for (y=0; y<h; y++) {
200 buf = pcx_rle_decode(buf, scanline, bytes_per_scanline);
202 for (x=0; x<w; x++) {
203 int m = 0x80 >> (x&7), v = 0;
204 for (i=nplanes - 1; i>=0; i--) {
205 v <<= 1;
206 v += !!(scanline[i*bytes_per_line + (x>>3)] & m);
208 ptr[x] = v;
210 ptr += stride;
214 if (nplanes == 1 && bits_per_pixel == 8) {
215 pcx_palette(&buf, (uint32_t *) p->data[1], 256);
216 } else if (bits_per_pixel < 8) {
217 const uint8_t *palette = bufstart+16;
218 pcx_palette(&palette, (uint32_t *) p->data[1], 16);
221 *picture = s->picture;
222 *data_size = sizeof(AVFrame);
224 return buf - bufstart;
227 static av_cold int pcx_end(AVCodecContext *avctx) {
228 PCXContext *s = avctx->priv_data;
230 if(s->picture.data[0])
231 avctx->release_buffer(avctx, &s->picture);
233 return 0;
236 AVCodec pcx_decoder = {
237 "pcx",
238 CODEC_TYPE_VIDEO,
239 CODEC_ID_PCX,
240 sizeof(PCXContext),
241 pcx_init,
242 NULL,
243 pcx_end,
244 pcx_decode_frame,
246 NULL,
247 .long_name = NULL_IF_CONFIG_SMALL("PC Paintbrush PCX image"),