mirror of https://github.com/FFmpeg/FFmpeg.git
Patch by Michael Tison (gmail address: blackspike@....) Originally committed as revision 20890 to svn://svn.ffmpeg.org/ffmpeg/trunkrelease/0.6
Michael Tison
15 years ago
committed by
Vitor Sessak
parent
8993535cbb
commit
a3d995c1eb
10 changed files with 457 additions and 1 deletions
@ -0,0 +1,380 @@ |
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/*
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* CD Graphics Video Decoder |
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* Copyright (c) 2009 Michael Tison |
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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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#include "avcodec.h" |
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#include "bytestream.h" |
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/**
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* @file libavcodec/cdgraphics.c |
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* @brief CD Graphics Video Decoder |
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* @author Michael Tison |
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* @sa http://wiki.multimedia.cx/index.php?title=CD_Graphics
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* @sa http://www.ccs.neu.edu/home/bchafy/cdb/info/cdg
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*/ |
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/// default screen sizes
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#define CDG_FULL_WIDTH 300 |
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#define CDG_FULL_HEIGHT 216 |
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#define CDG_DISPLAY_WIDTH 294 |
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#define CDG_DISPLAY_HEIGHT 204 |
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#define CDG_BORDER_WIDTH 6 |
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#define CDG_BORDER_HEIGHT 12 |
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/// masks
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#define CDG_COMMAND 0x09 |
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#define CDG_MASK 0x3F |
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/// instruction codes
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#define CDG_INST_MEMORY_PRESET 1 |
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#define CDG_INST_BORDER_PRESET 2 |
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#define CDG_INST_TILE_BLOCK 6 |
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#define CDG_INST_SCROLL_PRESET 20 |
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#define CDG_INST_SCROLL_COPY 24 |
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#define CDG_INST_LOAD_PAL_LO 30 |
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#define CDG_INST_LOAD_PAL_HIGH 31 |
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#define CDG_INST_TILE_BLOCK_XOR 38 |
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/// data sizes
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#define CDG_PACKET_SIZE 24 |
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#define CDG_DATA_SIZE 16 |
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#define CDG_TILE_HEIGHT 12 |
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#define CDG_TILE_WIDTH 6 |
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#define CDG_MINIMUM_PKT_SIZE 6 |
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#define CDG_MINIMUM_SCROLL_SIZE 3 |
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#define CDG_HEADER_SIZE 8 |
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#define CDG_PALETTE_SIZE 16 |
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typedef struct CDGraphicsContext { |
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AVFrame frame; |
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int hscroll; |
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int vscroll; |
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} CDGraphicsContext; |
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static void cdg_init_frame(AVFrame *frame) |
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{ |
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avcodec_get_frame_defaults(frame); |
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frame->reference = 1; |
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frame->buffer_hints = FF_BUFFER_HINTS_VALID | |
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FF_BUFFER_HINTS_PRESERVE | |
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FF_BUFFER_HINTS_REUSABLE; |
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} |
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static av_cold int cdg_decode_init(AVCodecContext *avctx) |
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{ |
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CDGraphicsContext *cc = avctx->priv_data; |
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cdg_init_frame(&cc->frame); |
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avctx->width = CDG_FULL_WIDTH; |
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avctx->height = CDG_FULL_HEIGHT; |
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avctx->pix_fmt = PIX_FMT_PAL8; |
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return 0; |
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} |
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static void cdg_border_preset(CDGraphicsContext *cc, uint8_t *data) |
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{ |
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int y; |
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int lsize = cc->frame.linesize[0]; |
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uint8_t *buf = cc->frame.data[0]; |
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int color = data[0] & 0x0F; |
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if (!(data[1] & 0x0F)) { |
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/// fill the top and bottom borders
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memset(buf, color, CDG_BORDER_HEIGHT * lsize); |
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memset(buf + (CDG_FULL_HEIGHT - CDG_BORDER_HEIGHT) * lsize, |
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color, CDG_BORDER_HEIGHT * lsize); |
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/// fill the side borders
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for (y = CDG_BORDER_HEIGHT; y < CDG_FULL_HEIGHT - CDG_BORDER_HEIGHT; y++) { |
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memset(buf + y * lsize, color, CDG_BORDER_WIDTH); |
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memset(buf + CDG_FULL_WIDTH - CDG_BORDER_WIDTH + y * lsize, |
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color, CDG_BORDER_WIDTH); |
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} |
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} |
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} |
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static void cdg_load_palette(CDGraphicsContext *cc, uint8_t *data, int low) |
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{ |
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uint8_t r, g, b; |
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uint16_t color; |
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int i; |
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int array_offset = low ? 0 : 8; |
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uint32_t *palette = (uint32_t *) cc->frame.data[1]; |
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for (i = 0; i < 8; i++) { |
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color = (data[2 * i] << 6) + (data[2 * i + 1] & 0x3F); |
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r = ((color >> 8) & 0x000F) * 17; |
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g = ((color >> 4) & 0x000F) * 17; |
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b = ((color ) & 0x000F) * 17; |
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palette[i + array_offset] = r << 16 | g << 8 | b; |
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} |
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cc->frame.palette_has_changed = 1; |
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} |
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static int cdg_tile_block(CDGraphicsContext *cc, uint8_t *data, int b) |
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{ |
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unsigned ci, ri; |
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int color; |
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int x, y; |
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int ai; |
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int stride = cc->frame.linesize[0]; |
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uint8_t *buf = cc->frame.data[0]; |
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ri = (data[2] & 0x1F) * CDG_TILE_HEIGHT + cc->vscroll; |
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ci = (data[3] & 0x3F) * CDG_TILE_WIDTH + cc->hscroll; |
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if (ri > (CDG_FULL_HEIGHT - CDG_TILE_HEIGHT)) |
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return AVERROR(EINVAL); |
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if (ci > (CDG_FULL_WIDTH - CDG_TILE_WIDTH)) |
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return AVERROR(EINVAL); |
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for (y = 0; y < CDG_TILE_HEIGHT; y++) { |
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for (x = 0; x < CDG_TILE_WIDTH; x++) { |
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if (!((data[4 + y] >> (5 - x)) & 0x01)) |
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color = data[0] & 0x0F; |
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else |
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color = data[1] & 0x0F; |
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ai = ci + x + (stride * (ri + y)); |
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if (b) |
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color ^= buf[ai]; |
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buf[ai] = color; |
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} |
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} |
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return 0; |
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} |
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#define UP 2 |
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#define DOWN 1 |
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#define LEFT 2 |
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#define RIGHT 1 |
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static void cdg_copy_rect_buf(int out_tl_x, int out_tl_y, uint8_t *out, |
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int in_tl_x, int in_tl_y, uint8_t *in, |
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int w, int h, int stride) |
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{ |
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int y; |
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in += in_tl_x + in_tl_y * stride; |
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out += out_tl_x + out_tl_y * stride; |
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for (y = 0; y < h; y++) |
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memcpy(out + y * stride, in + y * stride, w); |
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} |
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static void cdg_fill_rect_preset(int tl_x, int tl_y, uint8_t *out, |
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int color, int w, int h, int stride) |
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{ |
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int y; |
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for (y = tl_y; y < tl_y + h; y++) |
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memset(out + tl_x + y * stride, color, w); |
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} |
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static void cdg_fill_wrapper(int out_tl_x, int out_tl_y, uint8_t *out, |
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int in_tl_x, int in_tl_y, uint8_t *in, |
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int color, int w, int h, int stride, int roll) |
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{ |
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if (roll) { |
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cdg_copy_rect_buf(out_tl_x, out_tl_y, out, in_tl_x, in_tl_y, |
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in, w, h, stride); |
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} else { |
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cdg_fill_rect_preset(out_tl_x, out_tl_y, out, color, w, h, stride); |
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} |
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} |
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static void cdg_scroll(CDGraphicsContext *cc, uint8_t *data, |
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AVFrame *new_frame, int roll_over) |
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{ |
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int color; |
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int hscmd, h_off, hinc, vscmd, v_off, vinc; |
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int y; |
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int stride = cc->frame.linesize[0]; |
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uint8_t *in = cc->frame.data[0]; |
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uint8_t *out = new_frame->data[0]; |
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color = data[0] & 0x0F; |
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hscmd = (data[1] & 0x30) >> 4; |
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vscmd = (data[2] & 0x30) >> 4; |
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h_off = FFMIN(data[1] & 0x07, CDG_BORDER_WIDTH - 1); |
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v_off = FFMIN(data[2] & 0x07, CDG_BORDER_HEIGHT - 1); |
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/// find the difference and save the offset for cdg_tile_block usage
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hinc = h_off - cc->hscroll; |
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vinc = v_off - cc->vscroll; |
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cc->hscroll = h_off; |
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cc->vscroll = v_off; |
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if (vscmd == UP) |
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vinc -= 12; |
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if (vscmd == DOWN) |
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vinc += 12; |
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if (hscmd == LEFT) |
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hinc -= 6; |
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if (hscmd == RIGHT) |
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hinc += 6; |
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if (!hinc && !vinc) |
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return; |
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memcpy(new_frame->data[1], cc->frame.data[1], CDG_PALETTE_SIZE * 4); |
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for (y = FFMAX(0, vinc); y < FFMIN(CDG_FULL_HEIGHT + vinc, CDG_FULL_HEIGHT); y++) |
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memcpy(out + FFMAX(0, hinc) + stride * y, |
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in + FFMAX(0, hinc) - hinc + (y - vinc) * stride, |
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FFMIN(stride + hinc, stride)); |
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if (vinc > 0) |
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cdg_fill_wrapper(0, 0, out, |
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0, CDG_FULL_HEIGHT - vinc, in, color, |
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stride, vinc, stride, roll_over); |
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else if (vinc < 0) |
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cdg_fill_wrapper(0, CDG_FULL_HEIGHT + vinc, out, |
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0, 0, in, color, |
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stride, -1 * vinc, stride, roll_over); |
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if (hinc > 0) |
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cdg_fill_wrapper(0, 0, out, |
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CDG_FULL_WIDTH - hinc, 0, in, color, |
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hinc, CDG_FULL_HEIGHT, stride, roll_over); |
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else if (hinc < 0) |
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cdg_fill_wrapper(CDG_FULL_WIDTH + hinc, 0, out, |
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0, 0, in, color, |
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-1 * hinc, CDG_FULL_HEIGHT, stride, roll_over); |
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} |
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static int cdg_decode_frame(AVCodecContext *avctx, |
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void *data, int *data_size, AVPacket *avpkt) |
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{ |
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const uint8_t *buf = avpkt->data; |
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int buf_size = avpkt->size; |
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int ret; |
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uint8_t command, inst; |
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uint8_t cdg_data[CDG_DATA_SIZE]; |
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AVFrame new_frame; |
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CDGraphicsContext *cc = avctx->priv_data; |
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if (buf_size < CDG_MINIMUM_PKT_SIZE) { |
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av_log(avctx, AV_LOG_ERROR, "buffer too small for decoder\n"); |
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return AVERROR(EINVAL); |
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} |
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ret = avctx->reget_buffer(avctx, &cc->frame); |
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if (ret) { |
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av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n"); |
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return ret; |
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} |
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command = bytestream_get_byte(&buf); |
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inst = bytestream_get_byte(&buf); |
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inst &= CDG_MASK; |
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buf += 2; /// skipping 2 unneeded bytes
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bytestream_get_buffer(&buf, cdg_data, buf_size - CDG_HEADER_SIZE); |
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if ((command & CDG_MASK) == CDG_COMMAND) { |
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switch (inst) { |
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case CDG_INST_MEMORY_PRESET: |
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if (!(cdg_data[1] & 0x0F)) |
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memset(cc->frame.data[0], cdg_data[0] & 0x0F, |
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cc->frame.linesize[0] * CDG_FULL_HEIGHT); |
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break; |
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case CDG_INST_LOAD_PAL_LO: |
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case CDG_INST_LOAD_PAL_HIGH: |
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if (buf_size - CDG_HEADER_SIZE < CDG_DATA_SIZE) { |
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av_log(avctx, AV_LOG_ERROR, "buffer too small for loading palette\n"); |
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return AVERROR(EINVAL); |
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} |
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cdg_load_palette(cc, cdg_data, inst == CDG_INST_LOAD_PAL_LO); |
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break; |
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case CDG_INST_BORDER_PRESET: |
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cdg_border_preset(cc, cdg_data); |
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break; |
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case CDG_INST_TILE_BLOCK_XOR: |
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case CDG_INST_TILE_BLOCK: |
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if (buf_size - CDG_HEADER_SIZE < CDG_DATA_SIZE) { |
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av_log(avctx, AV_LOG_ERROR, "buffer too small for drawing tile\n"); |
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return AVERROR(EINVAL); |
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} |
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ret = cdg_tile_block(cc, cdg_data, inst == CDG_INST_TILE_BLOCK_XOR); |
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if (ret) { |
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av_log(avctx, AV_LOG_ERROR, "tile is out of range\n"); |
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return ret; |
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} |
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break; |
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case CDG_INST_SCROLL_PRESET: |
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case CDG_INST_SCROLL_COPY: |
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if (buf_size - CDG_HEADER_SIZE < CDG_MINIMUM_SCROLL_SIZE) { |
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av_log(avctx, AV_LOG_ERROR, "buffer too small for scrolling\n"); |
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return AVERROR(EINVAL); |
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} |
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cdg_init_frame(&new_frame); |
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ret = avctx->get_buffer(avctx, &new_frame); |
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if (ret) { |
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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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cdg_scroll(cc, cdg_data, &new_frame, inst == CDG_INST_SCROLL_COPY); |
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avctx->release_buffer(avctx, &cc->frame); |
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cc->frame = new_frame; |
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break; |
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default: |
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break; |
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} |
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*data_size = sizeof(AVFrame); |
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} else { |
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*data_size = 0; |
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buf_size = 0; |
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} |
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*(AVFrame *) data = cc->frame; |
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return buf_size; |
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} |
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static av_cold int cdg_decode_end(AVCodecContext *avctx) |
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{ |
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CDGraphicsContext *cc = avctx->priv_data; |
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if (cc->frame.data[0]) |
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avctx->release_buffer(avctx, &cc->frame); |
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return 0; |
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} |
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AVCodec cdgraphics_decoder = { |
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"cdgraphics", |
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CODEC_TYPE_VIDEO, |
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CODEC_ID_CDGRAPHICS, |
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sizeof(CDGraphicsContext), |
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cdg_decode_init, |
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NULL, |
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cdg_decode_end, |
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cdg_decode_frame, |
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CODEC_CAP_DR1, |
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.long_name = NULL_IF_CONFIG_SMALL("CD Graphics video"), |
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}; |
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@ -0,0 +1,66 @@ |
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/*
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* CD Graphics Demuxer |
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* Copyright (c) 2009 Michael Tison |
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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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#include "avformat.h" |
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#define CDG_PACKET_SIZE 24 |
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static int read_header(AVFormatContext *s, AVFormatParameters *ap) |
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{ |
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AVStream *vst; |
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int ret; |
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vst = av_new_stream(s, 0); |
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if (!vst) |
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return AVERROR(ENOMEM); |
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vst->codec->codec_type = CODEC_TYPE_VIDEO; |
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vst->codec->codec_id = CODEC_ID_CDGRAPHICS; |
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/// 75 sectors/sec * 4 packets/sector = 300 packets/sec
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av_set_pts_info(vst, 32, 1, 300); |
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ret = url_fsize(s->pb); |
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if (ret > 0) |
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vst->duration = (ret * vst->time_base.den) / (CDG_PACKET_SIZE * 300); |
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return 0; |
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} |
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static int read_packet(AVFormatContext *s, AVPacket *pkt) |
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{ |
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int ret; |
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ret = av_get_packet(s->pb, pkt, CDG_PACKET_SIZE); |
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pkt->stream_index = 0; |
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return ret; |
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} |
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AVInputFormat cdg_demuxer = { |
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"cdg", |
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NULL_IF_CONFIG_SMALL("CD Graphics Format"), |
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0, |
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NULL, |
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read_header, |
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read_packet, |
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.extensions = "cdg" |
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}; |
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