adding ffmpeg specific version

1 files changed, 238 insertions, 0 deletions

diff --git a/ffmpeg1/libavcodec/mmvideo.c b/ffmpeg1/libavcodec/mmvideo.c
new file mode 100644
index 0000000..bf47f65
--- /dev/null
+++ b/ffmpeg1/libavcodec/mmvideo.c
@@ -0,0 +1,238 @@
+/*
+ * American Laser Games MM Video Decoder
+ * Copyright (c) 2006,2008 Peter Ross
+ *
+ * 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
+ * American Laser Games MM Video Decoder
+ * by Peter Ross (pross@xvid.org)
+ *
+ * The MM format was used by IBM-PC ports of ALG's "arcade shooter" games,
+ * including Mad Dog McCree and Crime Patrol.
+ *
+ * Technical details here:
+ *  http://wiki.multimedia.cx/index.php?title=American_Laser_Games_MM
+ */
+
+#include "libavutil/intreadwrite.h"
+#include "avcodec.h"
+#include "bytestream.h"
+#include "internal.h"
+
+#define MM_PREAMBLE_SIZE    6
+
+#define MM_TYPE_INTER       0x5
+#define MM_TYPE_INTRA       0x8
+#define MM_TYPE_INTRA_HH    0xc
+#define MM_TYPE_INTER_HH    0xd
+#define MM_TYPE_INTRA_HHV   0xe
+#define MM_TYPE_INTER_HHV   0xf
+#define MM_TYPE_PALETTE     0x31
+
+typedef struct MmContext {
+    AVCodecContext *avctx;
+    AVFrame frame;
+    int palette[AVPALETTE_COUNT];
+    GetByteContext gb;
+} MmContext;
+
+static av_cold int mm_decode_init(AVCodecContext *avctx)
+{
+    MmContext *s = avctx->priv_data;
+
+    s->avctx = avctx;
+
+    avctx->pix_fmt = AV_PIX_FMT_PAL8;
+
+    avcodec_get_frame_defaults(&s->frame);
+
+    return 0;
+}
+
+static int mm_decode_pal(MmContext *s)
+{
+    int i;
+
+    bytestream2_skip(&s->gb, 4);
+    for (i = 0; i < 128; i++) {
+        s->palette[i] = 0xFFU << 24 | bytestream2_get_be24(&s->gb);
+        s->palette[i+128] = s->palette[i]<<2;
+    }
+
+    return 0;
+}
+
+/**
+ * @param half_horiz Half horizontal resolution (0 or 1)
+ * @param half_vert Half vertical resolution (0 or 1)
+ */
+static int mm_decode_intra(MmContext * s, int half_horiz, int half_vert)
+{
+    int x = 0, y = 0;
+
+    while (bytestream2_get_bytes_left(&s->gb) > 0) {
+        int run_length, color;
+
+        if (y >= s->avctx->height)
+            return 0;
+
+        color = bytestream2_get_byte(&s->gb);
+        if (color & 0x80) {
+            run_length = 1;
+        }else{
+            run_length = (color & 0x7f) + 2;
+            color = bytestream2_get_byte(&s->gb);
+        }
+
+        if (half_horiz)
+            run_length *=2;
+
+        if (color) {
+            memset(s->frame.data[0] + y*s->frame.linesize[0] + x, color, run_length);
+            if (half_vert)
+                memset(s->frame.data[0] + (y+1)*s->frame.linesize[0] + x, color, run_length);
+        }
+        x+= run_length;
+
+        if (x >= s->avctx->width) {
+            x=0;
+            y += 1 + half_vert;
+        }
+    }
+
+    return 0;
+}
+
+/**
+ * @param half_horiz Half horizontal resolution (0 or 1)
+ * @param half_vert Half vertical resolution (0 or 1)
+ */
+static int mm_decode_inter(MmContext * s, int half_horiz, int half_vert)
+{
+    int data_off = bytestream2_get_le16(&s->gb), y = 0;
+    GetByteContext data_ptr;
+
+    if (bytestream2_get_bytes_left(&s->gb) < data_off)
+        return AVERROR_INVALIDDATA;
+
+    bytestream2_init(&data_ptr, s->gb.buffer + data_off, bytestream2_get_bytes_left(&s->gb) - data_off);
+    while (s->gb.buffer < data_ptr.buffer_start) {
+        int i, j;
+        int length = bytestream2_get_byte(&s->gb);
+        int x = bytestream2_get_byte(&s->gb) + ((length & 0x80) << 1);
+        length &= 0x7F;
+
+        if (length==0) {
+            y += x;
+            continue;
+        }
+
+        if (y + half_vert >= s->avctx->height)
+            return 0;
+
+        for(i=0; i<length; i++) {
+            int replace_array = bytestream2_get_byte(&s->gb);
+            for(j=0; j<8; j++) {
+                int replace = (replace_array >> (7-j)) & 1;
+                if (replace) {
+                    int color = bytestream2_get_byte(&data_ptr);
+                    s->frame.data[0][y*s->frame.linesize[0] + x] = color;
+                    if (half_horiz)
+                        s->frame.data[0][y*s->frame.linesize[0] + x + 1] = color;
+                    if (half_vert) {
+                        s->frame.data[0][(y+1)*s->frame.linesize[0] + x] = color;
+                        if (half_horiz)
+                            s->frame.data[0][(y+1)*s->frame.linesize[0] + x + 1] = color;
+                    }
+                }
+                x += 1 + half_horiz;
+            }
+        }
+
+        y += 1 + half_vert;
+    }
+
+    return 0;
+}
+
+static int mm_decode_frame(AVCodecContext *avctx,
+                            void *data, int *got_frame,
+                            AVPacket *avpkt)
+{
+    const uint8_t *buf = avpkt->data;
+    int buf_size = avpkt->size;
+    MmContext *s = avctx->priv_data;
+    int type, res;
+
+    if (buf_size < MM_PREAMBLE_SIZE)
+        return AVERROR_INVALIDDATA;
+    type = AV_RL16(&buf[0]);
+    buf += MM_PREAMBLE_SIZE;
+    buf_size -= MM_PREAMBLE_SIZE;
+    bytestream2_init(&s->gb, buf, buf_size);
+
+    if ((res = ff_reget_buffer(avctx, &s->frame)) < 0)
+        return res;
+
+    switch(type) {
+    case MM_TYPE_PALETTE   : res = mm_decode_pal(s); return avpkt->size;
+    case MM_TYPE_INTRA     : res = mm_decode_intra(s, 0, 0); break;
+    case MM_TYPE_INTRA_HH  : res = mm_decode_intra(s, 1, 0); break;
+    case MM_TYPE_INTRA_HHV : res = mm_decode_intra(s, 1, 1); break;
+    case MM_TYPE_INTER     : res = mm_decode_inter(s, 0, 0); break;
+    case MM_TYPE_INTER_HH  : res = mm_decode_inter(s, 1, 0); break;
+    case MM_TYPE_INTER_HHV : res = mm_decode_inter(s, 1, 1); break;
+    default:
+        res = AVERROR_INVALIDDATA;
+        break;
+    }
+    if (res < 0)
+        return res;
+
+    memcpy(s->frame.data[1], s->palette, AVPALETTE_SIZE);
+
+    if ((res = av_frame_ref(data, &s->frame)) < 0)
+        return res;
+
+    *got_frame      = 1;
+
+    return avpkt->size;
+}
+
+static av_cold int mm_decode_end(AVCodecContext *avctx)
+{
+    MmContext *s = avctx->priv_data;
+
+    av_frame_unref(&s->frame);
+
+    return 0;
+}
+
+AVCodec ff_mmvideo_decoder = {
+    .name           = "mmvideo",
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = AV_CODEC_ID_MMVIDEO,
+    .priv_data_size = sizeof(MmContext),
+    .init           = mm_decode_init,
+    .close          = mm_decode_end,
+    .decode         = mm_decode_frame,
+    .capabilities   = CODEC_CAP_DR1,
+    .long_name      = NULL_IF_CONFIG_SMALL("American Laser Games MM Video"),
+};