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253 lines
8.1 KiB
253 lines
8.1 KiB
/* |
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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 Libav. |
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* |
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* Libav 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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* Libav 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 Libav; 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 "libavutil/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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#include "internal.h" |
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typedef struct PicContext { |
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int width, height; |
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int nb_planes; |
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GetByteContext g; |
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} PicContext; |
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static void picmemset_8bpp(PicContext *s, AVFrame *frame, int value, int run, |
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int *x, int *y) |
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{ |
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while (run > 0) { |
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uint8_t *d = frame->data[0] + *y * 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, AVFrame *frame, int value, int run, |
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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 = frame->data[0] + *y * 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 *got_frame, |
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AVPacket *avpkt) |
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{ |
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PicContext *s = avctx->priv_data; |
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AVFrame *frame = data; |
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uint32_t *palette; |
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int bits_per_plane, bpp, etype, esize, npal, pos_after_pal; |
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int i, x, y, plane, tmp, ret; |
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bytestream2_init(&s->g, avpkt->data, avpkt->size); |
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if (bytestream2_get_bytes_left(&s->g) < 11) |
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return AVERROR_INVALIDDATA; |
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if (bytestream2_get_le16u(&s->g) != 0x1234) |
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return AVERROR_INVALIDDATA; |
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s->width = bytestream2_get_le16u(&s->g); |
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s->height = bytestream2_get_le16u(&s->g); |
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bytestream2_skip(&s->g, 4); |
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tmp = bytestream2_get_byteu(&s->g); |
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bits_per_plane = tmp & 0xF; |
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s->nb_planes = (tmp >> 4) + 1; |
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bpp = bits_per_plane * s->nb_planes; |
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if (bits_per_plane > 8 || bpp < 1 || bpp > 32) { |
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avpriv_request_sample(avctx, "Unsupported bit depth"); |
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return AVERROR_PATCHWELCOME; |
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} |
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if (bytestream2_peek_byte(&s->g) == 0xFF) { |
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bytestream2_skip(&s->g, 2); |
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etype = bytestream2_get_le16(&s->g); |
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esize = bytestream2_get_le16(&s->g); |
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if (bytestream2_get_bytes_left(&s->g) < 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 = AV_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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} |
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if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) { |
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av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); |
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return ret; |
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} |
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memset(frame->data[0], 0, s->height * frame->linesize[0]); |
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frame->pict_type = AV_PICTURE_TYPE_I; |
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frame->palette_has_changed = 1; |
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pos_after_pal = bytestream2_tell(&s->g) + esize; |
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palette = (uint32_t*)frame->data[1]; |
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if (etype == 1 && esize > 1 && bytestream2_peek_byte(&s->g) < 6) { |
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int idx = bytestream2_get_byte(&s->g); |
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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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int pal_idx = bytestream2_get_byte(&s->g); |
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palette[i] = ff_cga_palette[FFMIN(pal_idx, 16)]; |
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} |
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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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int pal_idx = bytestream2_get_byte(&s->g); |
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palette[i] = ff_ega_palette[FFMIN(pal_idx, 63)]; |
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} |
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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] = bytestream2_get_be24(&s->g) << 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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// skip remaining palette bytes |
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bytestream2_seek(&s->g, pos_after_pal, SEEK_SET); |
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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 (bytestream2_get_le16(&s->g)) { |
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while (bytestream2_get_bytes_left(&s->g) >= 6) { |
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int stop_size, marker, t1, t2; |
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t1 = bytestream2_get_bytes_left(&s->g); |
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t2 = bytestream2_get_le16(&s->g); |
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stop_size = t1 - FFMIN(t1, t2); |
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// ignore uncompressed block size |
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bytestream2_skip(&s->g, 2); |
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marker = bytestream2_get_byte(&s->g); |
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while (plane < s->nb_planes && |
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bytestream2_get_bytes_left(&s->g) > stop_size) { |
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int run = 1; |
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int val = bytestream2_get_byte(&s->g); |
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if (val == marker) { |
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run = bytestream2_get_byte(&s->g); |
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if (run == 0) |
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run = bytestream2_get_le16(&s->g); |
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val = bytestream2_get_byte(&s->g); |
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} |
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if (!bytestream2_get_bytes_left(&s->g)) |
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break; |
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if (bits_per_plane == 8) { |
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picmemset_8bpp(s, frame, val, run, &x, &y); |
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if (y < 0) |
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goto finish; |
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} else { |
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picmemset(s, frame, 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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avpriv_request_sample(avctx, "Uncompressed image"); |
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return avpkt->size; |
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} |
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finish: |
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*got_frame = 1; |
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return avpkt->size; |
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} |
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AVCodec ff_pictor_decoder = { |
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.name = "pictor", |
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.long_name = NULL_IF_CONFIG_SMALL("Pictor/PC Paint"), |
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.type = AVMEDIA_TYPE_VIDEO, |
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.id = AV_CODEC_ID_PICTOR, |
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.priv_data_size = sizeof(PicContext), |
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.decode = decode_frame, |
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.capabilities = CODEC_CAP_DR1, |
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};
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