| /* | |
| * Binary text decoder | |
| * eXtended BINary text (XBIN) decoder | |
| * iCEDraw File 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 | |
| * Binary text decoder | |
| * eXtended BINary text (XBIN) decoder | |
| * iCEDraw File decoder | |
| */ | |
| #include "config_components.h" | |
| #include "libavutil/intreadwrite.h" | |
| #include "libavutil/xga_font_data.h" | |
| #include "avcodec.h" | |
| #include "cga_data.h" | |
| #include "bintext.h" | |
| #include "codec_internal.h" | |
| #include "decode.h" | |
| #define FONT_WIDTH 8 | |
| typedef struct XbinContext { | |
| AVFrame *frame; | |
| int palette[16]; | |
| int flags; | |
| int font_height; | |
| const uint8_t *font; | |
| int x, y; | |
| } XbinContext; | |
| static av_cold int decode_init(AVCodecContext *avctx) | |
| { | |
| XbinContext *s = avctx->priv_data; | |
| uint8_t *p; | |
| int i; | |
| avctx->pix_fmt = AV_PIX_FMT_PAL8; | |
| p = avctx->extradata; | |
| if (p) { | |
| s->font_height = p[0]; | |
| s->flags = p[1]; | |
| p += 2; | |
| if(avctx->extradata_size < 2 + (!!(s->flags & BINTEXT_PALETTE))*3*16 | |
| + (!!(s->flags & BINTEXT_FONT))*s->font_height*256) { | |
| av_log(avctx, AV_LOG_ERROR, "not enough extradata\n"); | |
| return AVERROR_INVALIDDATA; | |
| } | |
| if (!s->font_height) { | |
| av_log(avctx, AV_LOG_ERROR, "invalid font height\n"); | |
| return AVERROR_INVALIDDATA; | |
| } | |
| } else { | |
| s->font_height = 8; | |
| s->flags = 0; | |
| } | |
| if ((s->flags & BINTEXT_PALETTE)) { | |
| for (i = 0; i < 16; i++) { | |
| s->palette[i] = 0xFF000000 | (AV_RB24(p) << 2) | ((AV_RB24(p) >> 4) & 0x30303); | |
| p += 3; | |
| } | |
| } else { | |
| for (i = 0; i < 16; i++) | |
| s->palette[i] = 0xFF000000 | ff_cga_palette[i]; | |
| } | |
| if ((s->flags & BINTEXT_FONT)) { | |
| s->font = p; | |
| } else { | |
| switch(s->font_height) { | |
| default: | |
| av_log(avctx, AV_LOG_WARNING, "font height %i not supported\n", s->font_height); | |
| s->font_height = 8; | |
| case 8: | |
| s->font = avpriv_cga_font; | |
| break; | |
| case 16: | |
| s->font = avpriv_vga16_font; | |
| break; | |
| } | |
| } | |
| if (avctx->width < FONT_WIDTH || avctx->height < s->font_height) { | |
| av_log(avctx, AV_LOG_ERROR, "Resolution too small for font.\n"); | |
| return AVERROR_INVALIDDATA; | |
| } | |
| return 0; | |
| } | |
| #define DEFAULT_BG_COLOR 0 | |
| av_unused static void hscroll(AVCodecContext *avctx) | |
| { | |
| XbinContext *s = avctx->priv_data; | |
| if (s->y < avctx->height - s->font_height) { | |
| s->y += s->font_height; | |
| } else { | |
| memmove(s->frame->data[0], s->frame->data[0] + s->font_height*s->frame->linesize[0], | |
| (avctx->height - s->font_height)*s->frame->linesize[0]); | |
| memset(s->frame->data[0] + (avctx->height - s->font_height)*s->frame->linesize[0], | |
| DEFAULT_BG_COLOR, s->font_height * s->frame->linesize[0]); | |
| } | |
| } | |
| /** | |
| * Draw character to screen | |
| */ | |
| static void draw_char(AVCodecContext *avctx, int c, int a) | |
| { | |
| XbinContext *s = avctx->priv_data; | |
| if (s->y > avctx->height - s->font_height) | |
| return; | |
| ff_draw_pc_font(s->frame->data[0] + s->y * s->frame->linesize[0] + s->x, | |
| s->frame->linesize[0], s->font, s->font_height, c, | |
| a & 0x0F, a >> 4); | |
| s->x += FONT_WIDTH; | |
| if (s->x > avctx->width - FONT_WIDTH) { | |
| s->x = 0; | |
| s->y += s->font_height; | |
| } | |
| } | |
| static int decode_frame(AVCodecContext *avctx, AVFrame *frame, | |
| int *got_frame, AVPacket *avpkt) | |
| { | |
| XbinContext *s = avctx->priv_data; | |
| const uint8_t *buf = avpkt->data; | |
| int buf_size = avpkt->size; | |
| const uint8_t *buf_end = buf+buf_size; | |
| int ret; | |
| if ((avctx->width / FONT_WIDTH) * (avctx->height / s->font_height) / 256 > buf_size) | |
| return AVERROR_INVALIDDATA; | |
| s->frame = frame; | |
| s->x = s->y = 0; | |
| if ((ret = ff_get_buffer(avctx, s->frame, 0)) < 0) | |
| return ret; | |
| s->frame->pict_type = AV_PICTURE_TYPE_I; | |
| #if FF_API_PALETTE_HAS_CHANGED | |
| FF_DISABLE_DEPRECATION_WARNINGS | |
| s->frame->palette_has_changed = 1; | |
| FF_ENABLE_DEPRECATION_WARNINGS | |
| #endif | |
| memcpy(s->frame->data[1], s->palette, 16 * 4); | |
| if (avctx->codec_id == AV_CODEC_ID_XBIN) { | |
| while (buf + 2 < buf_end) { | |
| int i,c,a; | |
| int type = *buf >> 6; | |
| int count = (*buf & 0x3F) + 1; | |
| buf++; | |
| switch (type) { | |
| case 0: //no compression | |
| for (i = 0; i < count && buf + 1 < buf_end; i++) { | |
| draw_char(avctx, buf[0], buf[1]); | |
| buf += 2; | |
| } | |
| break; | |
| case 1: //character compression | |
| c = *buf++; | |
| for (i = 0; i < count && buf < buf_end; i++) | |
| draw_char(avctx, c, *buf++); | |
| break; | |
| case 2: //attribute compression | |
| a = *buf++; | |
| for (i = 0; i < count && buf < buf_end; i++) | |
| draw_char(avctx, *buf++, a); | |
| break; | |
| case 3: //character/attribute compression | |
| c = *buf++; | |
| a = *buf++; | |
| for (i = 0; i < count && buf < buf_end; i++) | |
| draw_char(avctx, c, a); | |
| break; | |
| } | |
| } | |
| } else if (avctx->codec_id == AV_CODEC_ID_IDF) { | |
| while (buf + 2 < buf_end) { | |
| if (AV_RL16(buf) == 1) { | |
| int i; | |
| if (buf + 6 > buf_end) | |
| break; | |
| for (i = 0; i < buf[2]; i++) | |
| draw_char(avctx, buf[4], buf[5]); | |
| buf += 6; | |
| } else { | |
| draw_char(avctx, buf[0], buf[1]); | |
| buf += 2; | |
| } | |
| } | |
| } else { | |
| while (buf + 1 < buf_end) { | |
| draw_char(avctx, buf[0], buf[1]); | |
| buf += 2; | |
| } | |
| } | |
| *got_frame = 1; | |
| return buf_size; | |
| } | |
| #if CONFIG_BINTEXT_DECODER | |
| const FFCodec ff_bintext_decoder = { | |
| .p.name = "bintext", | |
| CODEC_LONG_NAME("Binary text"), | |
| .p.type = AVMEDIA_TYPE_VIDEO, | |
| .p.id = AV_CODEC_ID_BINTEXT, | |
| .priv_data_size = sizeof(XbinContext), | |
| .init = decode_init, | |
| FF_CODEC_DECODE_CB(decode_frame), | |
| .p.capabilities = AV_CODEC_CAP_DR1, | |
| }; | |
| #endif | |
| #if CONFIG_XBIN_DECODER | |
| const FFCodec ff_xbin_decoder = { | |
| .p.name = "xbin", | |
| CODEC_LONG_NAME("eXtended BINary text"), | |
| .p.type = AVMEDIA_TYPE_VIDEO, | |
| .p.id = AV_CODEC_ID_XBIN, | |
| .priv_data_size = sizeof(XbinContext), | |
| .init = decode_init, | |
| FF_CODEC_DECODE_CB(decode_frame), | |
| .p.capabilities = AV_CODEC_CAP_DR1, | |
| }; | |
| #endif | |
| #if CONFIG_IDF_DECODER | |
| const FFCodec ff_idf_decoder = { | |
| .p.name = "idf", | |
| CODEC_LONG_NAME("iCEDraw text"), | |
| .p.type = AVMEDIA_TYPE_VIDEO, | |
| .p.id = AV_CODEC_ID_IDF, | |
| .priv_data_size = sizeof(XbinContext), | |
| .init = decode_init, | |
| FF_CODEC_DECODE_CB(decode_frame), | |
| .p.capabilities = AV_CODEC_CAP_DR1, | |
| }; | |
| #endif |