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* PC Paintbrush PCX (.pcx) image decoder
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* Copyright (c) 2007, 2008 Ivo van Poorten
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* This decoder does not support CGA palettes. I am unable to find samples
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* and Netpbm cannot generate them.
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* This file is part of FFmpeg.
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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#include "bytestream.h"
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#include "bitstream.h"
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typedef struct PCXContext {
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static av_cold int pcx_init(AVCodecContext *avctx) {
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PCXContext *s = avctx->priv_data;
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avcodec_get_frame_defaults(&s->picture);
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avctx->coded_frame= &s->picture;
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* @return advanced src pointer
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static const uint8_t *pcx_rle_decode(const uint8_t *src, uint8_t *dst,
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unsigned int bytes_per_scanline) {
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unsigned char run, value;
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while (i<bytes_per_scanline) {
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while (i<bytes_per_scanline && run--)
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static void pcx_palette(const uint8_t **src, uint32_t *dst, unsigned int pallen) {
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for (i=0; i<pallen; i++)
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*dst++ = bytestream_get_be24(src);
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memset(dst, 0, (256 - pallen) * sizeof(*dst));
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static int pcx_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
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const uint8_t *buf, int buf_size) {
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PCXContext * const s = avctx->priv_data;
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AVFrame *picture = data;
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AVFrame * const p = &s->picture;
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int xmin, ymin, xmax, ymax;
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unsigned int w, h, bits_per_pixel, bytes_per_line, nplanes, stride, y, x,
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uint8_t const *bufstart = buf;
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if (buf[0] != 0x0a || buf[1] > 5 || buf[1] == 1 || buf[2] != 1) {
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av_log(avctx, AV_LOG_ERROR, "this is not PCX encoded data\n");
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xmin = AV_RL16(buf+ 4);
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ymin = AV_RL16(buf+ 6);
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xmax = AV_RL16(buf+ 8);
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ymax = AV_RL16(buf+10);
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if (xmax < xmin || ymax < ymin) {
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av_log(avctx, AV_LOG_ERROR, "invalid image dimensions\n");
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bits_per_pixel = buf[3];
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bytes_per_line = AV_RL16(buf+66);
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bytes_per_scanline = nplanes * bytes_per_line;
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if (bytes_per_scanline < w * bits_per_pixel * nplanes / 8) {
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av_log(avctx, AV_LOG_ERROR, "PCX data is corrupted\n");
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switch ((nplanes<<8) + bits_per_pixel) {
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avctx->pix_fmt = PIX_FMT_RGB24;
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avctx->pix_fmt = PIX_FMT_PAL8;
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av_log(avctx, AV_LOG_ERROR, "invalid PCX file\n");
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avctx->release_buffer(avctx, p);
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if (avcodec_check_dimensions(avctx, w, h))
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if (w != avctx->width || h != avctx->height)
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avcodec_set_dimensions(avctx, w, h);
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if (avctx->get_buffer(avctx, p) < 0) {
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av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
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p->pict_type = FF_I_TYPE;
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stride = p->linesize[0];
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if (nplanes == 3 && bits_per_pixel == 8) {
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uint8_t scanline[bytes_per_scanline];
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for (y=0; y<h; y++) {
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buf = pcx_rle_decode(buf, scanline, bytes_per_scanline);
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for (x=0; x<w; x++) {
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ptr[3*x ] = scanline[x ];
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ptr[3*x+1] = scanline[x+ bytes_per_line ];
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ptr[3*x+2] = scanline[x+(bytes_per_line<<1)];
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} else if (nplanes == 1 && bits_per_pixel == 8) {
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uint8_t scanline[bytes_per_scanline];
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const uint8_t *palstart = bufstart + buf_size - 769;
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for (y=0; y<h; y++, ptr+=stride) {
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buf = pcx_rle_decode(buf, scanline, bytes_per_scanline);
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memcpy(ptr, scanline, w);
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if (buf != palstart) {
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av_log(avctx, AV_LOG_WARNING, "image data possibly corrupted\n");
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av_log(avctx, AV_LOG_ERROR, "expected palette after image data\n");
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} else if (nplanes == 1) { /* all packed formats, max. 16 colors */
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uint8_t scanline[bytes_per_scanline];
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for (y=0; y<h; y++) {
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init_get_bits(&s, scanline, bytes_per_scanline<<3);
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buf = pcx_rle_decode(buf, scanline, bytes_per_scanline);
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ptr[x] = get_bits(&s, bits_per_pixel);
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} else { /* planar, 4, 8 or 16 colors */
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uint8_t scanline[bytes_per_scanline];
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for (y=0; y<h; y++) {
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buf = pcx_rle_decode(buf, scanline, bytes_per_scanline);
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for (x=0; x<w; x++) {
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int m = 0x80 >> (x&7), v = 0;
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for (i=nplanes - 1; i>=0; i--) {
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v += !!(scanline[i*bytes_per_line + (x>>3)] & m);
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if (nplanes == 1 && bits_per_pixel == 8) {
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pcx_palette(&buf, (uint32_t *) p->data[1], 256);
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} else if (bits_per_pixel < 8) {
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const uint8_t *palette = bufstart+16;
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pcx_palette(&palette, (uint32_t *) p->data[1], 16);
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*picture = s->picture;
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*data_size = sizeof(AVFrame);
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return buf - bufstart;
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static av_cold int pcx_end(AVCodecContext *avctx) {
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PCXContext *s = avctx->priv_data;
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if(s->picture.data[0])
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avctx->release_buffer(avctx, &s->picture);
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AVCodec pcx_decoder = {
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.long_name = NULL_IF_CONFIG_SMALL("PC Paintbrush PCX image"),