Add 8088flex TMV video decoder.

Patch by Daniel Verkamp name at drv ... nu.

Originally committed as revision 18765 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/Makefile

@@ -221,6 +221,7 @@ OBJS-$(CONFIG_THP_DECODER)             += mjpegdec.o mjpeg.o
 OBJS-$(CONFIG_TIERTEXSEQVIDEO_DECODER) += tiertexseqv.o
 OBJS-$(CONFIG_TIFF_DECODER)            += tiff.o lzw.o faxcompr.o
 OBJS-$(CONFIG_TIFF_ENCODER)            += tiffenc.o rle.o lzwenc.o
+OBJS-$(CONFIG_TMV_DECODER)             += tmv.o cga_data.o
 OBJS-$(CONFIG_TRUEHD_DECODER)          += mlpdec.o mlp_parser.o mlp.o mlpdsp.o
 OBJS-$(CONFIG_TRUEMOTION1_DECODER)     += truemotion1.o
 OBJS-$(CONFIG_TRUEMOTION2_DECODER)     += truemotion2.o

libavcodec/allcodecs.c

@@ -162,6 +162,7 @@ void avcodec_register_all(void)
     REGISTER_DECODER (THP, thp);
     REGISTER_DECODER (TIERTEXSEQVIDEO, tiertexseqvideo);
     REGISTER_ENCDEC  (TIFF, tiff);
+    REGISTER_DECODER (TMV, tmv);
     REGISTER_DECODER (TRUEMOTION1, truemotion1);
     REGISTER_DECODER (TRUEMOTION2, truemotion2);
     REGISTER_DECODER (TSCC, tscc);

libavcodec/avcodec.h

@@ -194,6 +194,7 @@ enum CodecID {
     CODEC_ID_AURA,
     CODEC_ID_AURA2,
     CODEC_ID_V210X,
+    CODEC_ID_TMV,
 
     /* various PCM "codecs" */
     CODEC_ID_PCM_S16LE= 0x10000,

libavcodec/tmv.c

+/*
+ * 8088flex TMV video decoder
+ * Copyright (c) 2009 Daniel Verkamp <daniel at drv.nu>
+ *
+ * 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
+ */
+
+/**
+ * 8088flex TMV video decoder
+ * @file libavcodec/tmv.c
+ * @author Daniel Verkamp
+ * @sa http://www.oldskool.org/pc/8088_Corruption
+ */
+
+#include "avcodec.h"
+
+#include "cga_data.h"
+
+typedef struct TMVContext {
+    AVFrame pic;
+} TMVContext;
+
+static int tmv_decode_frame(AVCodecContext *avctx, void *data,
+                            int *data_size, AVPacket *avpkt)
+{
+    TMVContext *tmv    = avctx->priv_data;
+    const uint8_t *src = avpkt->data;
+    uint8_t *dst, *dst_char;
+    unsigned char_cols = avctx->width >> 3;
+    unsigned char_rows = avctx->height >> 3;
+    unsigned x, y, mask, char_y, fg, bg, c;
+
+    if (tmv->pic.data[0])
+        avctx->release_buffer(avctx, &tmv->pic);
+
+    if (avctx->get_buffer(avctx, &tmv->pic) < 0) {
+        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
+        return -1;
+    }
+
+    tmv->pic.pict_type = FF_I_TYPE;
+    tmv->pic.key_frame = 1;
+    dst                = tmv->pic.data[0];
+
+    tmv->pic.palette_has_changed = 1;
+    memcpy(tmv->pic.data[1], ff_cga_palette, 16 * 4);
+
+    for (y = 0; y < char_rows; y++) {
+        for (x = 0; x < char_cols; x++) {
+            c  = *src++ * 8;
+            bg = *src  >> 4;
+            fg = *src++ & 0xF;
+
+            dst_char = dst + x * 8;
+            for (char_y = 0; char_y < 8; char_y++) {
+                for (mask = 0x80; mask; mask >>= 1) {
+                    *dst_char++ = ff_cga_font[c + char_y] & mask ? fg : bg;
+                }
+                dst_char += tmv->pic.linesize[0] - 8;
+            }
+        }
+        dst += tmv->pic.linesize[0] * 8;
+    }
+
+    *data_size = sizeof(AVFrame);
+    *(AVFrame *)data = tmv->pic;
+    return avpkt->size;
+}
+
+static av_cold int tmv_decode_close(AVCodecContext *avctx)
+{
+    TMVContext *tmv = avctx->priv_data;
+
+    if (tmv->pic.data[0])
+        avctx->release_buffer(avctx, &tmv->pic);
+
+    return 0;
+}
+
+AVCodec tmv_decoder = {
+    .name           = "tmv",
+    .type           = CODEC_TYPE_VIDEO,
+    .id             = CODEC_ID_TMV,
+    .priv_data_size = sizeof(TMVContext),
+    .close          = tmv_decode_close,
+    .decode         = tmv_decode_frame,
+    .long_name      = NULL_IF_CONFIG_SMALL("8088flex TMV"),
+};