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20f9727018
Up until now, codec.h contains both public and private parts of AVCodec. This exposes the internals of AVCodec to users and leads them into the temptation of actually using them and forces us to forward-declare structures and types that users can't use at all. This commit changes this by adding a new structure FFCodec to codec_internal.h that extends AVCodec, i.e. contains the public AVCodec as first member; the private fields of AVCodec are moved to this structure, leaving codec.h clean. Reviewed-by: Anton Khirnov <anton@khirnov.net> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
259 lines
7.8 KiB
C
259 lines
7.8 KiB
C
/*
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* Binary text decoder
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* eXtended BINary text (XBIN) decoder
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* iCEDraw File 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
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* Binary text decoder
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* eXtended BINary text (XBIN) decoder
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* iCEDraw File decoder
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*/
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#include "config_components.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/xga_font_data.h"
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#include "avcodec.h"
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#include "cga_data.h"
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#include "bintext.h"
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#include "codec_internal.h"
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#include "internal.h"
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#define FONT_WIDTH 8
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typedef struct XbinContext {
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AVFrame *frame;
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int palette[16];
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int flags;
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int font_height;
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const uint8_t *font;
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int x, y;
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} XbinContext;
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static av_cold int decode_init(AVCodecContext *avctx)
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{
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XbinContext *s = avctx->priv_data;
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uint8_t *p;
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int i;
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avctx->pix_fmt = AV_PIX_FMT_PAL8;
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p = avctx->extradata;
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if (p) {
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s->font_height = p[0];
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s->flags = p[1];
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p += 2;
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if(avctx->extradata_size < 2 + (!!(s->flags & BINTEXT_PALETTE))*3*16
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+ (!!(s->flags & BINTEXT_FONT))*s->font_height*256) {
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av_log(avctx, AV_LOG_ERROR, "not enough extradata\n");
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return AVERROR_INVALIDDATA;
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}
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if (!s->font_height) {
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av_log(avctx, AV_LOG_ERROR, "invalid font height\n");
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return AVERROR_INVALIDDATA;
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}
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} else {
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s->font_height = 8;
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s->flags = 0;
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}
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if ((s->flags & BINTEXT_PALETTE)) {
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for (i = 0; i < 16; i++) {
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s->palette[i] = 0xFF000000 | (AV_RB24(p) << 2) | ((AV_RB24(p) >> 4) & 0x30303);
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p += 3;
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}
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} else {
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for (i = 0; i < 16; i++)
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s->palette[i] = 0xFF000000 | ff_cga_palette[i];
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}
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if ((s->flags & BINTEXT_FONT)) {
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s->font = p;
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} else {
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switch(s->font_height) {
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default:
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av_log(avctx, AV_LOG_WARNING, "font height %i not supported\n", s->font_height);
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s->font_height = 8;
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case 8:
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s->font = avpriv_cga_font;
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break;
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case 16:
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s->font = avpriv_vga16_font;
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break;
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}
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}
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if (avctx->width < FONT_WIDTH || avctx->height < s->font_height) {
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av_log(avctx, AV_LOG_ERROR, "Resolution too small for font.\n");
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return AVERROR_INVALIDDATA;
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}
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return 0;
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}
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#define DEFAULT_BG_COLOR 0
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av_unused static void hscroll(AVCodecContext *avctx)
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{
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XbinContext *s = avctx->priv_data;
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if (s->y < avctx->height - s->font_height) {
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s->y += s->font_height;
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} else {
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memmove(s->frame->data[0], s->frame->data[0] + s->font_height*s->frame->linesize[0],
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(avctx->height - s->font_height)*s->frame->linesize[0]);
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memset(s->frame->data[0] + (avctx->height - s->font_height)*s->frame->linesize[0],
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DEFAULT_BG_COLOR, s->font_height * s->frame->linesize[0]);
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}
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}
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/**
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* Draw character to screen
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*/
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static void draw_char(AVCodecContext *avctx, int c, int a)
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{
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XbinContext *s = avctx->priv_data;
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if (s->y > avctx->height - s->font_height)
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return;
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ff_draw_pc_font(s->frame->data[0] + s->y * s->frame->linesize[0] + s->x,
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s->frame->linesize[0], s->font, s->font_height, c,
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a & 0x0F, a >> 4);
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s->x += FONT_WIDTH;
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if (s->x > avctx->width - FONT_WIDTH) {
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s->x = 0;
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s->y += s->font_height;
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}
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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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XbinContext *s = avctx->priv_data;
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const uint8_t *buf = avpkt->data;
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int buf_size = avpkt->size;
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const uint8_t *buf_end = buf+buf_size;
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int ret;
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if ((avctx->width / FONT_WIDTH) * (avctx->height / s->font_height) / 256 > buf_size)
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return AVERROR_INVALIDDATA;
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s->frame = data;
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s->x = s->y = 0;
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if ((ret = ff_get_buffer(avctx, s->frame, 0)) < 0)
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return ret;
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s->frame->pict_type = AV_PICTURE_TYPE_I;
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s->frame->palette_has_changed = 1;
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memcpy(s->frame->data[1], s->palette, 16 * 4);
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if (avctx->codec_id == AV_CODEC_ID_XBIN) {
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while (buf + 2 < buf_end) {
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int i,c,a;
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int type = *buf >> 6;
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int count = (*buf & 0x3F) + 1;
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buf++;
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switch (type) {
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case 0: //no compression
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for (i = 0; i < count && buf + 1 < buf_end; i++) {
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draw_char(avctx, buf[0], buf[1]);
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buf += 2;
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}
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break;
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case 1: //character compression
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c = *buf++;
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for (i = 0; i < count && buf < buf_end; i++)
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draw_char(avctx, c, *buf++);
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break;
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case 2: //attribute compression
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a = *buf++;
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for (i = 0; i < count && buf < buf_end; i++)
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draw_char(avctx, *buf++, a);
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break;
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case 3: //character/attribute compression
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c = *buf++;
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a = *buf++;
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for (i = 0; i < count && buf < buf_end; i++)
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draw_char(avctx, c, a);
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break;
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}
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}
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} else if (avctx->codec_id == AV_CODEC_ID_IDF) {
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while (buf + 2 < buf_end) {
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if (AV_RL16(buf) == 1) {
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int i;
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if (buf + 6 > buf_end)
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break;
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for (i = 0; i < buf[2]; i++)
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draw_char(avctx, buf[4], buf[5]);
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buf += 6;
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} else {
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draw_char(avctx, buf[0], buf[1]);
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buf += 2;
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}
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}
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} else {
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while (buf + 1 < buf_end) {
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draw_char(avctx, buf[0], buf[1]);
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buf += 2;
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}
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}
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*got_frame = 1;
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return buf_size;
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}
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#if CONFIG_BINTEXT_DECODER
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const FFCodec ff_bintext_decoder = {
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.p.name = "bintext",
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.p.long_name = NULL_IF_CONFIG_SMALL("Binary text"),
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.p.type = AVMEDIA_TYPE_VIDEO,
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.p.id = AV_CODEC_ID_BINTEXT,
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.priv_data_size = sizeof(XbinContext),
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.init = decode_init,
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.decode = decode_frame,
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.p.capabilities = AV_CODEC_CAP_DR1,
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.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
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};
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#endif
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#if CONFIG_XBIN_DECODER
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const FFCodec ff_xbin_decoder = {
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.p.name = "xbin",
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.p.long_name = NULL_IF_CONFIG_SMALL("eXtended BINary text"),
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.p.type = AVMEDIA_TYPE_VIDEO,
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.p.id = AV_CODEC_ID_XBIN,
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.priv_data_size = sizeof(XbinContext),
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.init = decode_init,
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.decode = decode_frame,
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.p.capabilities = AV_CODEC_CAP_DR1,
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.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
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};
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#endif
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#if CONFIG_IDF_DECODER
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const FFCodec ff_idf_decoder = {
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.p.name = "idf",
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.p.long_name = NULL_IF_CONFIG_SMALL("iCEDraw text"),
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.p.type = AVMEDIA_TYPE_VIDEO,
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.p.id = AV_CODEC_ID_IDF,
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.priv_data_size = sizeof(XbinContext),
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.init = decode_init,
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.decode = decode_frame,
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.p.capabilities = AV_CODEC_CAP_DR1,
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.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
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};
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#endif
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