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-rw-r--r--libavcodec/bintext.c258
1 files changed, 258 insertions, 0 deletions
diff --git a/libavcodec/bintext.c b/libavcodec/bintext.c
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+++ b/libavcodec/bintext.c
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+/*
+ * 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 "libavutil/intreadwrite.h"
+#include "libavutil/xga_font_data.h"
+#include "avcodec.h"
+#include "cga_data.h"
+#include "bintext.h"
+#include "internal.h"
+
+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;
+ }
+ } 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;
+ }
+ }
+
+ s->frame = av_frame_alloc();
+ if (!s->frame)
+ return AVERROR(ENOMEM);
+
+ 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]);
+ }
+}
+
+#define FONT_WIDTH 8
+
+/**
+ * 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,
+ void *data, 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;
+
+ s->x = s->y = 0;
+ if ((ret = ff_reget_buffer(avctx, s->frame)) < 0)
+ return ret;
+ s->frame->pict_type = AV_PICTURE_TYPE_I;
+ s->frame->palette_has_changed = 1;
+ 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;
+ }
+ }
+
+ if ((ret = av_frame_ref(data, s->frame)) < 0)
+ return ret;
+ *got_frame = 1;
+ return buf_size;
+}
+
+static av_cold int decode_end(AVCodecContext *avctx)
+{
+ XbinContext *s = avctx->priv_data;
+
+ av_frame_free(&s->frame);
+
+ return 0;
+}
+
+#if CONFIG_BINTEXT_DECODER
+AVCodec ff_bintext_decoder = {
+ .name = "bintext",
+ .long_name = NULL_IF_CONFIG_SMALL("Binary text"),
+ .type = AVMEDIA_TYPE_VIDEO,
+ .id = AV_CODEC_ID_BINTEXT,
+ .priv_data_size = sizeof(XbinContext),
+ .init = decode_init,
+ .close = decode_end,
+ .decode = decode_frame,
+ .capabilities = AV_CODEC_CAP_DR1,
+};
+#endif
+#if CONFIG_XBIN_DECODER
+AVCodec ff_xbin_decoder = {
+ .name = "xbin",
+ .long_name = NULL_IF_CONFIG_SMALL("eXtended BINary text"),
+ .type = AVMEDIA_TYPE_VIDEO,
+ .id = AV_CODEC_ID_XBIN,
+ .priv_data_size = sizeof(XbinContext),
+ .init = decode_init,
+ .close = decode_end,
+ .decode = decode_frame,
+ .capabilities = AV_CODEC_CAP_DR1,
+};
+#endif
+#if CONFIG_IDF_DECODER
+AVCodec ff_idf_decoder = {
+ .name = "idf",
+ .long_name = NULL_IF_CONFIG_SMALL("iCEDraw text"),
+ .type = AVMEDIA_TYPE_VIDEO,
+ .id = AV_CODEC_ID_IDF,
+ .priv_data_size = sizeof(XbinContext),
+ .init = decode_init,
+ .close = decode_end,
+ .decode = decode_frame,
+ .capabilities = AV_CODEC_CAP_DR1,
+};
+#endif