Binary text decoder

Decoder and demuxer for various binary text formats.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

5 files changed, 300 insertions, 0 deletions

diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index fe1ff2a4dd..408317ebfc 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -96,6 +96,7 @@ OBJS-$(CONFIG_BFI_DECODER)             += bfi.o
 OBJS-$(CONFIG_BINK_DECODER)            += bink.o binkdsp.o
 OBJS-$(CONFIG_BINKAUDIO_DCT_DECODER)   += binkaudio.o wma.o
 OBJS-$(CONFIG_BINKAUDIO_RDFT_DECODER)  += binkaudio.o wma.o
+OBJS-$(CONFIG_BINTEXT_DECODER)         += bintext.o cga_data.o
 OBJS-$(CONFIG_BMP_DECODER)             += bmp.o msrledec.o
 OBJS-$(CONFIG_BMP_ENCODER)             += bmpenc.o
 OBJS-$(CONFIG_C93_DECODER)             += c93.o
@@ -188,6 +189,7 @@ OBJS-$(CONFIG_H264_VAAPI_HWACCEL)      += vaapi_h264.o
 OBJS-$(CONFIG_HUFFYUV_DECODER)         += huffyuv.o
 OBJS-$(CONFIG_HUFFYUV_ENCODER)         += huffyuv.o
 OBJS-$(CONFIG_IDCIN_DECODER)           += idcinvideo.o
+OBJS-$(CONFIG_IDF_DECODER)             += bintext.o cga_data.o
 OBJS-$(CONFIG_IFF_BYTERUN1_DECODER)    += iff.o
 OBJS-$(CONFIG_IFF_ILBM_DECODER)        += iff.o
 OBJS-$(CONFIG_IMC_DECODER)             += imc.o
@@ -440,6 +442,7 @@ OBJS-$(CONFIG_WS_SND1_DECODER)         += ws-snd1.o
 OBJS-$(CONFIG_XAN_DPCM_DECODER)        += dpcm.o
 OBJS-$(CONFIG_XAN_WC3_DECODER)         += xan.o
 OBJS-$(CONFIG_XAN_WC4_DECODER)         += xxan.o
+OBJS-$(CONFIG_XBIN_DECODER)            += bintext.o cga_data.o
 OBJS-$(CONFIG_XL_DECODER)              += xl.o
 OBJS-$(CONFIG_XSUB_DECODER)            += xsubdec.o
 OBJS-$(CONFIG_XSUB_ENCODER)            += xsubenc.o
diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c
index 8734f5d974..309d762f81 100644
--- a/libavcodec/allcodecs.c
+++ b/libavcodec/allcodecs.c
@@ -393,6 +393,11 @@ void avcodec_register_all(void)
     REGISTER_ENCODER (LIBXAVS, libxavs);
     REGISTER_ENCODER (LIBXVID, libxvid);
 
+    /* text */
+    REGISTER_DECODER (BINTEXT, bintext);
+    REGISTER_DECODER  (XBIN, xbin);
+    REGISTER_DECODER  (IDF, idf);
+
     /* parsers */
     REGISTER_PARSER  (AAC, aac);
     REGISTER_PARSER  (AAC_LATM, aac_latm);
diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index 4ce084c574..f8f4f69ef6 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -361,6 +361,9 @@ enum CodecID {
     /* other specific kind of codecs (generally used for attachments) */
     CODEC_ID_FIRST_UNKNOWN = 0x18000,           ///< A dummy ID pointing at the start of various fake codecs.
     CODEC_ID_TTF= 0x18000,
+    CODEC_ID_BINTEXT,
+    CODEC_ID_XBIN,
+    CODEC_ID_IDF,
 
     CODEC_ID_PROBE= 0x19000, ///< codec_id is not known (like CODEC_ID_NONE) but lavf should attempt to identify it
 
diff --git a/libavcodec/bintext.c b/libavcodec/bintext.c
new file mode 100644
index 0000000000..0726d4689d
--- /dev/null
+++ b/libavcodec/bintext.c
@@ -0,0 +1,252 @@
+/*
+ * 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 libavcodec/xbin.c
+ * Binary text decoder
+ * eXtended BINary text (XBIN) decoder
+ * iCEDraw File decoder
+ */
+
+#include "libavutil/intreadwrite.h"
+#include "avcodec.h"
+#include "cga_data.h"
+#include "bintext.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 = PIX_FMT_PAL8;
+    s->frame.reference = 1;
+    if (avctx->get_buffer(avctx, &s->frame)) {
+        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
+        return -1;
+    }
+
+    p = avctx->extradata;
+    if (p) {
+        s->font_height = p[0];
+        s->flags = p[1];
+        p += 2;
+    } 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);
+            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 support\n", s->font_height);
+            s->font_height = 8;
+        case 8:
+            s->font = ff_cga_font;
+            break;
+        case 16:
+            s->font = ff_vga16_font;
+            break;
+        }
+    }
+
+    return 0;
+}
+
+#define DEFAULT_BG_COLOR 0
+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) {
+        s->x = 0;
+        s->y += s->font_height;
+    }
+}
+
+static int decode_frame(AVCodecContext *avctx,
+                            void *data, int *data_size,
+                            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;
+
+    if (avctx->reget_buffer(avctx, &s->frame)) {
+        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
+        return -1;
+    }
+    s->frame.pict_type           = FF_I_TYPE;
+    s->frame.palette_has_changed = 1;
+    memcpy(s->frame.data[1], s->palette, 16 * 4);
+
+    if (avctx->codec_id == 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 == 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;
+        }
+    }
+
+    *data_size = sizeof(AVFrame);
+    *(AVFrame*)data = s->frame;
+    return buf_size;
+}
+
+static av_cold int decode_end(AVCodecContext *avctx)
+{
+    XbinContext *s = avctx->priv_data;
+
+    if (s->frame.data[0])
+        avctx->release_buffer(avctx, &s->frame);
+
+    return 0;
+}
+
+AVCodec ff_bintext_decoder = {
+    "xbin",
+    AVMEDIA_TYPE_VIDEO,
+    CODEC_ID_BINTEXT,
+    sizeof(XbinContext),
+    decode_init,
+    NULL,
+    decode_end,
+    decode_frame,
+    CODEC_CAP_DR1,
+    .long_name = NULL_IF_CONFIG_SMALL("Binary text"),
+};
+
+AVCodec ff_xbin_decoder = {
+    "xbin",
+    AVMEDIA_TYPE_VIDEO,
+    CODEC_ID_XBIN,
+    sizeof(XbinContext),
+    decode_init,
+    NULL,
+    decode_end,
+    decode_frame,
+    CODEC_CAP_DR1,
+    .long_name = NULL_IF_CONFIG_SMALL("eXtended BINary text"),
+};
+
+AVCodec ff_idf_decoder = {
+    "idf",
+    AVMEDIA_TYPE_VIDEO,
+    CODEC_ID_IDF,
+    sizeof(XbinContext),
+    decode_init,
+    NULL,
+    decode_end,
+    decode_frame,
+    CODEC_CAP_DR1,
+    .long_name = NULL_IF_CONFIG_SMALL("iCEDraw text"),
+};
diff --git a/libavcodec/bintext.h b/libavcodec/bintext.h
new file mode 100644
index 0000000000..ea834a00e3
--- /dev/null
+++ b/libavcodec/bintext.h
@@ -0,0 +1,37 @@
+/*
+ * Binary text 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
+ */
+
+#ifndef AVCODEC_BINTEXT_H
+#define AVCODEC_BINTEXT_H
+
+/* flag values passed between avformat and avcodec;
+ * while these are identical to the XBIN flags, they are are also used
+ * for the BINTEXT and IDF decoders.
+ */
+#define BINTEXT_PALETTE  0x1
+#define BINTEXT_FONT     0x2
+
+#endif /* AVCODEC_BINTEXT_H */