/* * Pictor/PC Paint decoder * Copyright (c) 2010 Peter Ross * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file * Pictor/PC Paint decoder */ #include "libavutil/imgutils.h" #include "avcodec.h" #include "bytestream.h" #include "cga_data.h" typedef struct PicContext { AVFrame frame; int width, height; int nb_planes; } PicContext; static void picmemset_8bpp(PicContext *s, int value, int run, int *x, int *y) { while (run > 0) { uint8_t *d = s->frame.data[0] + *y * s->frame.linesize[0]; if (*x + run >= s->width) { int n = s->width - *x; memset(d + *x, value, n); run -= n; *x = 0; *y -= 1; if (*y < 0) break; } else { memset(d + *x, value, run); *x += run; break; } } } static void picmemset(PicContext *s, int value, int run, int *x, int *y, int *plane, int bits_per_plane) { uint8_t *d; int shift = *plane * bits_per_plane; int mask = ((1 << bits_per_plane) - 1) << shift; value <<= shift; while (run > 0) { int j; for (j = 8-bits_per_plane; j >= 0; j -= bits_per_plane) { d = s->frame.data[0] + *y * s->frame.linesize[0]; d[*x] |= (value >> j) & mask; *x += 1; if (*x == s->width) { *y -= 1; *x = 0; if (*y < 0) { *y = s->height - 1; *plane += 1; value <<= bits_per_plane; mask <<= bits_per_plane; if (*plane >= s->nb_planes) break; } } } run--; } } static const uint8_t cga_mode45_index[6][4] = { [0] = { 0, 3, 5, 7 }, // mode4, palette#1, low intensity [1] = { 0, 2, 4, 6 }, // mode4, palette#2, low intensity [2] = { 0, 3, 4, 7 }, // mode5, low intensity [3] = { 0, 11, 13, 15 }, // mode4, palette#1, high intensity [4] = { 0, 10, 12, 14 }, // mode4, palette#2, high intensity [5] = { 0, 11, 12, 15 }, // mode5, high intensity }; static av_cold int decode_init(AVCodecContext *avctx) { PicContext *s = avctx->priv_data; avcodec_get_frame_defaults(&s->frame); return 0; } static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt) { PicContext *s = avctx->priv_data; int buf_size = avpkt->size; const uint8_t *buf = avpkt->data; const uint8_t *buf_end = avpkt->data + buf_size; uint32_t *palette; int bits_per_plane, bpp, etype, esize, npal; int i, x, y, plane; if (buf_size < 11) return AVERROR_INVALIDDATA; if (bytestream_get_le16(&buf) != 0x1234) return AVERROR_INVALIDDATA; s->width = bytestream_get_le16(&buf); s->height = bytestream_get_le16(&buf); buf += 4; bits_per_plane = *buf & 0xF; s->nb_planes = (*buf++ >> 4) + 1; bpp = s->nb_planes ? bits_per_plane*s->nb_planes : bits_per_plane; if (bits_per_plane > 8 || bpp < 1 || bpp > 32) { av_log_ask_for_sample(s, "unsupported bit depth\n"); return AVERROR_INVALIDDATA; } if (*buf == 0xFF) { buf += 2; etype = bytestream_get_le16(&buf); esize = bytestream_get_le16(&buf); if (buf_end - buf < esize) return AVERROR_INVALIDDATA; } else { etype = -1; esize = 0; } avctx->pix_fmt = PIX_FMT_PAL8; if (s->width != avctx->width && s->height != avctx->height) { if (av_image_check_size(s->width, s->height, 0, avctx) < 0) return -1; avcodec_set_dimensions(avctx, s->width, s->height); if (s->frame.data[0]) avctx->release_buffer(avctx, &s->frame); } if (avctx->get_buffer(avctx, &s->frame) < 0){ av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); return -1; } memset(s->frame.data[0], 0, s->height * s->frame.linesize[0]); s->frame.pict_type = AV_PICTURE_TYPE_I; s->frame.palette_has_changed = 1; palette = (uint32_t*)s->frame.data[1]; if (etype == 1 && esize > 1 && *buf < 6) { int idx = *buf; npal = 4; for (i = 0; i < npal; i++) palette[i] = ff_cga_palette[ cga_mode45_index[idx][i] ]; } else if (etype == 2) { npal = FFMIN(esize, 16); for (i = 0; i < npal; i++) palette[i] = ff_cga_palette[ FFMIN(buf[i], 16)]; } else if (etype == 3) { npal = FFMIN(esize, 16); for (i = 0; i < npal; i++) palette[i] = ff_ega_palette[ FFMIN(buf[i], 63)]; } else if (etype == 4 || etype == 5) { npal = FFMIN(esize / 3, 256); for (i = 0; i < npal; i++) palette[i] = AV_RB24(buf + i*3) << 2; } else { if (bpp == 1) { npal = 2; palette[0] = 0x000000; palette[1] = 0xFFFFFF; } else if (bpp == 2) { npal = 4; for (i = 0; i < npal; i++) palette[i] = ff_cga_palette[ cga_mode45_index[0][i] ]; } else { npal = 16; memcpy(palette, ff_cga_palette, npal * 4); } } // fill remaining palette entries memset(palette + npal, 0, AVPALETTE_SIZE - npal * 4); buf += esize; x = 0; y = s->height - 1; plane = 0; if (bytestream_get_le16(&buf)) { while (buf_end - buf >= 6) { const uint8_t *buf_pend = buf + FFMIN(AV_RL16(buf), buf_end - buf); //ignore uncompressed block size reported at buf[2] int marker = buf[4]; buf += 5; while (plane < s->nb_planes && buf_pend - buf >= 1) { int run = 1; int val = *buf++; if (val == marker) { run = *buf++; if (run == 0) run = bytestream_get_le16(&buf); val = *buf++; } if (buf > buf_end) break; if (bits_per_plane == 8) { picmemset_8bpp(s, val, run, &x, &y); if (y < 0) break; } else { picmemset(s, val, run, &x, &y, &plane, bits_per_plane); } } } } else { av_log_ask_for_sample(s, "uncompressed image\n"); return buf_size; } *data_size = sizeof(AVFrame); *(AVFrame*)data = s->frame; return buf_size; } static av_cold int decode_end(AVCodecContext *avctx) { PicContext *s = avctx->priv_data; if (s->frame.data[0]) avctx->release_buffer(avctx, &s->frame); return 0; } AVCodec ff_pictor_decoder = { "pictor", AVMEDIA_TYPE_VIDEO, CODEC_ID_PICTOR, sizeof(PicContext), decode_init, NULL, decode_end, decode_frame, CODEC_CAP_DR1, .long_name = NULL_IF_CONFIG_SMALL("Pictor/PC Paint"), };