mirror of
https://git.ffmpeg.org/ffmpeg.git
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252 lines
7.5 KiB
C
252 lines
7.5 KiB
C
/*
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* Pictor/PC Paint decoder
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* Copyright (c) 2010 Peter Ross <pross@xvid.org>
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*
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* This file is part of FFmpeg.
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*
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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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*
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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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*
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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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*/
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/**
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* @file
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* Pictor/PC Paint decoder
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*/
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#include "libavcore/imgutils.h"
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#include "avcodec.h"
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#include "bytestream.h"
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#include "cga_data.h"
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typedef struct PicContext {
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AVFrame frame;
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int width, height;
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int nb_planes;
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} PicContext;
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static void picmemset_8bpp(PicContext *s, int value, int run, int *x, int *y)
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{
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while (run > 0) {
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uint8_t *d = s->frame.data[0] + *y * s->frame.linesize[0];
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if (*x + run >= s->width) {
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int n = s->width - *x;
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memset(d + *x, value, n);
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run -= n;
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*x = 0;
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*y -= 1;
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if (*y < 0)
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break;
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} else {
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memset(d + *x, value, run);
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*x += run;
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break;
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}
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}
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}
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static void picmemset(PicContext *s, int value, int run, int *x, int *y, int *plane, int bits_per_plane)
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{
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uint8_t *d;
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int shift = *plane * bits_per_plane;
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int mask = ((1 << bits_per_plane) - 1) << shift;
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value <<= shift;
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while (run > 0) {
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int j;
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for (j = 8-bits_per_plane; j >= 0; j -= bits_per_plane) {
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d = s->frame.data[0] + *y * s->frame.linesize[0];
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d[*x] |= (value >> j) & mask;
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*x += 1;
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if (*x == s->width) {
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*y -= 1;
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*x = 0;
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if (*y < 0) {
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*y = s->height - 1;
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*plane += 1;
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value <<= bits_per_plane;
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mask <<= bits_per_plane;
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if (*plane >= s->nb_planes)
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break;
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}
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}
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}
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run--;
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}
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}
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static const uint8_t cga_mode45_index[6][4] = {
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[0] = { 0, 3, 5, 7 }, // mode4, palette#1, low intensity
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[1] = { 0, 2, 4, 6 }, // mode4, palette#2, low intensity
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[2] = { 0, 3, 4, 7 }, // mode5, low intensity
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[3] = { 0, 11, 13, 15 }, // mode4, palette#1, high intensity
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[4] = { 0, 10, 12, 14 }, // mode4, palette#2, high intensity
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[5] = { 0, 11, 12, 15 }, // mode5, high intensity
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};
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static int decode_frame(AVCodecContext *avctx,
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void *data, int *data_size,
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AVPacket *avpkt)
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{
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PicContext *s = avctx->priv_data;
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int buf_size = avpkt->size;
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const uint8_t *buf = avpkt->data;
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const uint8_t *buf_end = avpkt->data + buf_size;
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uint32_t *palette;
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int bits_per_plane, bpp, etype, esize, npal;
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int i, x, y, plane;
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if (buf_size < 11)
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return AVERROR_INVALIDDATA;
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if (bytestream_get_le16(&buf) != 0x1234)
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return AVERROR_INVALIDDATA;
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s->width = bytestream_get_le16(&buf);
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s->height = bytestream_get_le16(&buf);
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buf += 4;
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bits_per_plane = *buf & 0xF;
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s->nb_planes = (*buf++ >> 4) + 1;
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bpp = s->nb_planes ? bits_per_plane*s->nb_planes : bits_per_plane;
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if (bits_per_plane > 8 || bpp < 1 || bpp > 32) {
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av_log_ask_for_sample(s, "unsupported bit depth\n");
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return AVERROR_INVALIDDATA;
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}
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if (*buf == 0xFF) {
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buf += 2;
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etype = bytestream_get_le16(&buf);
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esize = bytestream_get_le16(&buf);
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if (buf_end - buf < esize)
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return AVERROR_INVALIDDATA;
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} else {
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etype = -1;
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esize = 0;
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}
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avctx->pix_fmt = PIX_FMT_PAL8;
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if (s->width != avctx->width && s->height != avctx->height) {
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if (av_image_check_size(s->width, s->height, 0, avctx) < 0)
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return -1;
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avcodec_set_dimensions(avctx, s->width, s->height);
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if (s->frame.data[0])
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avctx->release_buffer(avctx, &s->frame);
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}
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if (avctx->get_buffer(avctx, &s->frame) < 0){
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av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
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return -1;
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}
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memset(s->frame.data[0], 0, s->height * s->frame.linesize[0]);
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s->frame.pict_type = FF_I_TYPE;
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s->frame.palette_has_changed = 1;
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palette = (uint32_t*)s->frame.data[1];
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if (etype == 1 && esize > 1 && *buf < 6) {
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int idx = *buf;
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npal = 4;
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for (i = 0; i < npal; i++)
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palette[i] = ff_cga_palette[ cga_mode45_index[idx][i] ];
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} else if (etype == 2) {
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npal = FFMIN(esize, 16);
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for (i = 0; i < npal; i++)
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palette[i] = ff_cga_palette[ FFMIN(buf[i], 16)];
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} else if (etype == 3) {
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npal = FFMIN(esize, 16);
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for (i = 0; i < npal; i++)
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palette[i] = ff_ega_palette[ FFMIN(buf[i], 63)];
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} else if (etype == 4 || etype == 5) {
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npal = FFMIN(esize / 3, 256);
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for (i = 0; i < npal; i++)
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palette[i] = AV_RB24(buf + i*3) << 2;
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} else {
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if (bpp == 1) {
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npal = 2;
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palette[0] = 0x000000;
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palette[1] = 0xFFFFFF;
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} else if (bpp == 2) {
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npal = 4;
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for (i = 0; i < npal; i++)
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palette[i] = ff_cga_palette[ cga_mode45_index[0][i] ];
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} else {
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npal = 16;
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memcpy(palette, ff_cga_palette, npal * 4);
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}
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}
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// fill remaining palette entries
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memset(palette + npal, 0, AVPALETTE_SIZE - npal * 4);
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buf += esize;
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x = 0;
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y = s->height - 1;
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plane = 0;
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if (bytestream_get_le16(&buf)) {
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while (buf_end - buf >= 6) {
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const uint8_t *buf_pend = buf + FFMIN(AV_RL16(buf), buf_end - buf);
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//ignore uncompressed block size reported at buf[2]
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int marker = buf[4];
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buf += 5;
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while (plane < s->nb_planes && buf_pend - buf >= 1) {
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int run = 1;
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int val = *buf++;
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if (val == marker) {
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run = *buf++;
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if (run == 0)
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run = bytestream_get_le16(&buf);
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val = *buf++;
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}
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if (buf > buf_end)
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break;
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if (bits_per_plane == 8) {
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picmemset_8bpp(s, val, run, &x, &y);
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if (y < 0)
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break;
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} else {
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picmemset(s, val, run, &x, &y, &plane, bits_per_plane);
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}
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}
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}
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} else {
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av_log_ask_for_sample(s, "uncompressed image\n");
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return buf_size;
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}
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*data_size = sizeof(AVFrame);
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*(AVFrame*)data = s->frame;
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return buf_size;
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}
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static av_cold int decode_end(AVCodecContext *avctx)
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{
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PicContext *s = avctx->priv_data;
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if (s->frame.data[0])
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avctx->release_buffer(avctx, &s->frame);
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return 0;
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}
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AVCodec pictor_decoder = {
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"pictor",
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CODEC_TYPE_VIDEO,
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CODEC_ID_PICTOR,
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sizeof(PicContext),
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NULL,
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NULL,
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decode_end,
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decode_frame,
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CODEC_CAP_DR1,
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.long_name = NULL_IF_CONFIG_SMALL("Pictor/PC Paint"),
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};
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