New demuxers: Sega FILM/CPK, Westwood VQA & AUD; new decoders: MS RLE &

Video-1, Apple RPZA, Cinepak, Westwood IMA ADPCM

Originally committed as revision 2324 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 219 insertions, 0 deletions

diff --git a/libavcodec/msrle.c b/libavcodec/msrle.c
new file mode 100644
index 0000000000..8943ef3cdf
--- /dev/null
+++ b/libavcodec/msrle.c
@@ -0,0 +1,219 @@
+/*
+ * Micrsoft RLE Video Decoder
+ * Copyright (C) 2003 the ffmpeg project
+ *
+ * This library 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 of the License, or (at your option) any later version.
+ *
+ * This library 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 this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+/**
+ * @file msrle.c
+ * MS RLE Video Decoder by Mike Melanson (melanson@pcisys.net)
+ * For more information about the MS RLE format, visit:
+ *   http://www.pcisys.net/~melanson/codecs/
+ *
+ * The MS RLE decoder outputs PAL8 colorspace data.
+ *
+ * Note that this decoder expects the palette colors from the end of the
+ * BITMAPINFO header passed through extradata.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "common.h"
+#include "avcodec.h"
+#include "dsputil.h"
+
+typedef struct MsrleContext {
+    AVCodecContext *avctx;
+    AVFrame frame;
+    AVFrame prev_frame;
+
+    unsigned char *buf;
+    int size;
+
+    unsigned int palette[256];
+} MsrleContext;
+
+#define FETCH_NEXT_STREAM_BYTE() \
+    if (stream_ptr >= s->size) \
+    { \
+      printf(" MS RLE: stream ptr just went out of bounds (1)\n"); \
+      return; \
+    } \
+    stream_byte = s->buf[stream_ptr++];
+
+static void msrle_decode_pal8(MsrleContext *s)
+{
+    int stream_ptr = 0;
+    unsigned char rle_code;
+    unsigned char extra_byte;
+    unsigned char stream_byte;
+    int pixel_ptr = 0;
+    int row_dec = s->frame.linesize[0];
+    int row_ptr = (s->avctx->height - 1) * row_dec;
+    int frame_size = row_dec * s->avctx->height;
+
+    while (row_ptr >= 0) {
+        FETCH_NEXT_STREAM_BYTE();
+        rle_code = stream_byte;
+        if (rle_code == 0) {
+            /* fetch the next byte to see how to handle escape code */
+            FETCH_NEXT_STREAM_BYTE();
+            if (stream_byte == 0) {
+                /* line is done, goto the next one */
+                row_ptr -= row_dec;
+                pixel_ptr = 0;
+            } else if (stream_byte == 1) {
+                /* decode is done */
+                return;
+            } else if (stream_byte == 2) {
+                /* reposition frame decode coordinates */
+                FETCH_NEXT_STREAM_BYTE();
+                pixel_ptr += stream_byte;
+                FETCH_NEXT_STREAM_BYTE();
+                row_ptr -= stream_byte * row_dec;
+            } else {
+                /* copy pixels from encoded stream */
+                if ((row_ptr + pixel_ptr + stream_byte > frame_size) ||
+                    (row_ptr < 0)) {
+                    printf(" MS RLE: frame ptr just went out of bounds (1)\n");
+                    return;
+                }
+
+                rle_code = stream_byte;
+                extra_byte = stream_byte & 0x01;
+                if (stream_ptr + rle_code + extra_byte > s->size) {
+                    printf(" MS RLE: stream ptr just went out of bounds (2)\n");
+                    return;
+                }
+
+                while (rle_code--) {
+                    FETCH_NEXT_STREAM_BYTE();
+                    s->frame.data[0][row_ptr + pixel_ptr] = stream_byte;
+                    pixel_ptr++;
+                }
+
+                /* if the RLE code is odd, skip a byte in the stream */
+                if (extra_byte)
+                    stream_ptr++;
+            }
+        } else {
+            /* decode a run of data */
+            if ((row_ptr + pixel_ptr + stream_byte > frame_size) ||
+                (row_ptr < 0)) {
+                printf(" MS RLE: frame ptr just went out of bounds (2)\n");
+                return;
+            }
+
+            FETCH_NEXT_STREAM_BYTE();
+
+            while(rle_code--) {
+                s->frame.data[0][row_ptr + pixel_ptr] = stream_byte;
+                pixel_ptr++;
+            }
+        }
+    }
+
+    /* make the palette available */
+    memcpy(s->frame.data[1], s->palette, 256 * 4);
+
+    /* one last sanity check on the way out */
+    if (stream_ptr < s->size)
+        printf(" MS RLE: ended frame decode with bytes left over (%d < %d)\n",
+            stream_ptr, s->size);
+}
+
+static int msrle_decode_init(AVCodecContext *avctx)
+{
+    MsrleContext *s = (MsrleContext *)avctx->priv_data;
+    int i, j;
+    unsigned char *palette;
+
+    s->avctx = avctx;
+
+    avctx->pix_fmt = PIX_FMT_PAL8;
+    avctx->has_b_frames = 0;
+    s->frame.data[0] = s->prev_frame.data[0] = NULL;
+
+    /* convert palette */
+    palette = (unsigned char *)s->avctx->extradata;
+    memset (s->palette, 0, 256 * 4);
+    for (i = 0, j = 0; i < s->avctx->extradata_size / 4; i++, j += 4)
+        s->palette[i] = 
+            (palette[j + 2] << 16) |
+            (palette[j + 1] <<  8) |
+            (palette[j + 0] <<  0);
+
+    return 0;
+}
+
+static int msrle_decode_frame(AVCodecContext *avctx,
+                              void *data, int *data_size,
+                              uint8_t *buf, int buf_size)
+{
+    MsrleContext *s = (MsrleContext *)avctx->priv_data;
+
+    s->buf = buf;
+    s->size = buf_size;
+
+    if (avctx->get_buffer(avctx, &s->frame)) {
+        printf ("  MS RLE: get_buffer() failed\n");
+        return -1;
+    }
+
+    /* grossly inefficient, but...oh well */
+    memcpy(s->frame.data[0], s->prev_frame.data[0], 
+        s->frame.linesize[0] * s->avctx->height);
+
+    msrle_decode_pal8(s);
+
+    if (s->frame.data[0])
+        avctx->release_buffer(avctx, &s->frame);
+
+    /* shuffle frames */
+    s->prev_frame = s->frame;
+
+    *data_size = sizeof(AVFrame);
+    *(AVFrame*)data = s->frame;
+
+    /* report that the buffer was completely consumed */
+    return buf_size;
+}
+
+static int msrle_decode_end(AVCodecContext *avctx)
+{
+    MsrleContext *s = (MsrleContext *)avctx->priv_data;
+
+    /* release the last frame */
+    if (s->prev_frame.data[0])
+        avctx->release_buffer(avctx, &s->prev_frame);
+
+    return 0;
+}
+
+AVCodec msrle_decoder = {
+    "msrle",
+    CODEC_TYPE_VIDEO,
+    CODEC_ID_MSRLE,
+    sizeof(MsrleContext),
+    msrle_decode_init,
+    NULL,
+    msrle_decode_end,
+    msrle_decode_frame,
+    CODEC_CAP_DR1,
+};