mirror of https://github.com/FFmpeg/FFmpeg.git
Originally committed as revision 23532 to svn://svn.ffmpeg.org/ffmpeg/trunkoldabi
Peter Ross
15 years ago
parent
f2b9b19fad
commit
a526d6197a
6 changed files with 257 additions and 1 deletions
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/*
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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 libavcodec/picdec.c |
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* Pictor/PC Paint decoder |
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*/ |
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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 (avcodec_check_dimensions(avctx, s->width, s->height) < 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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