| /* |
| * Pictor/PC Paint decoder |
| * Copyright (c) 2010 Peter Ross <pross@xvid.org> |
| * |
| * 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"), |
| }; |
