Autodesk Animator Studio Codec (AASC) video decoder, courtesy of

Konstantin Shishkov

Originally committed as revision 4099 to svn://svn.ffmpeg.org/ffmpeg/trunk

Changelog

@@ -13,6 +13,7 @@ version <next>
 - LOCO video decoder
 - Apple Lossless Audio Codec (ALAC) decoder 
 - Winnov WNV1 video decoder
+- Autodesk Animator Studio Codec (AASC) decoder
 
 version 0.4.9-pre1:
 

doc/ffmpeg-doc.texi

@@ -774,6 +774,7 @@ following image formats are supported:
 @item QPEG                   @tab     @tab  X @tab fourccs: QPEG, Q1.0, Q1.1
 @item LOCO                   @tab     @tab  X @tab 
 @item Winnov WNV1            @tab     @tab  X @tab 
+@item Autodesk Animator Studio Codec  @tab     @tab  X @tab fourcc: AASC
 @end multitable
 
 @code{X} means that the encoding (resp. decoding) is supported.

libavcodec/Makefile

@@ -23,7 +23,7 @@ OBJS= bitstream.o utils.o mem.o allcodecs.o \
       flac.o vp3dsp.o integer.o snow.o tscc.o sonic.o ulti.o h264idct.o \
       qdrw.o xl.o rangecoder.o png.o pnm.o qpeg.o vc9.o h263.o h261.o \
       msmpeg4.o h263dec.o svq1.o rv10.o wmadec.o indeo3.o shorten.o loco.o \
-      alac.o wnv1.o ws-snd1.o
+      alac.o wnv1.o ws-snd1.o aasc.o
 
 AMROBJS=
 ifeq ($(AMR_NB),yes)

libavcodec/aasc.c

+/*
+ * Autodesc RLE Decoder
+ * Copyright (C) 2005 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 aasc.c
+ * Autodesc RLE Video Decoder by Konstantin Shishkov
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "common.h"
+#include "avcodec.h"
+#include "dsputil.h"
+
+typedef struct AascContext {
+    AVCodecContext *avctx;
+    AVFrame frame;
+} AascContext;
+
+#define FETCH_NEXT_STREAM_BYTE() \
+    if (stream_ptr >= buf_size) \
+    { \
+      av_log(s->avctx, AV_LOG_ERROR, " AASC: stream ptr just went out of bounds (fetch)\n"); \
+      break; \
+    } \
+    stream_byte = buf[stream_ptr++];
+
+static int aasc_decode_init(AVCodecContext *avctx)
+{
+    AascContext *s = (AascContext *)avctx->priv_data;
+
+    s->avctx = avctx;
+
+    avctx->pix_fmt = PIX_FMT_BGR24;
+    avctx->has_b_frames = 0;
+    s->frame.data[0] = NULL;
+
+    return 0;
+}
+
+static int aasc_decode_frame(AVCodecContext *avctx,
+                              void *data, int *data_size,
+                              uint8_t *buf, int buf_size)
+{
+    AascContext *s = (AascContext *)avctx->priv_data;
+    int stream_ptr = 4;
+    unsigned char rle_code;
+    unsigned char stream_byte;
+    int pixel_ptr = 0;
+    int row_dec, row_ptr;
+    int frame_size;
+    int i;
+
+    s->frame.reference = 1;
+    s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
+    if (avctx->reget_buffer(avctx, &s->frame)) {
+        av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
+        return -1;
+    }
+
+    row_dec = s->frame.linesize[0];
+    row_ptr = (s->avctx->height - 1) * row_dec;
+    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 */
+                break;
+            } 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 ((pixel_ptr + stream_byte > avctx->width * 3) ||
+                    (row_ptr < 0)) {
+                    av_log(s->avctx, AV_LOG_ERROR, " AASC: frame ptr just went out of bounds (copy1)\n");
+                    break;
+                }
+
+                rle_code = stream_byte;
+                if (stream_ptr + rle_code > buf_size) {
+                    av_log(s->avctx, AV_LOG_ERROR, " AASC: stream ptr just went out of bounds (copy2)\n");
+                    break;
+                }
+
+                for (i = 0; i < rle_code; i++) {
+                    FETCH_NEXT_STREAM_BYTE();
+                    s->frame.data[0][row_ptr + pixel_ptr] = stream_byte;
+                    pixel_ptr++;
+                }
+                if (rle_code & 1)
+                    stream_ptr++;
+            }
+        } else {
+            /* decode a run of data */
+            if ((pixel_ptr + rle_code > avctx->width * 3) ||
+                (row_ptr < 0)) {
+                av_log(s->avctx, AV_LOG_ERROR, " AASC: frame ptr just went out of bounds (run1)\n");
+                break;
+            }
+
+            FETCH_NEXT_STREAM_BYTE();
+
+            while(rle_code--) {
+                s->frame.data[0][row_ptr + pixel_ptr] = stream_byte;
+                pixel_ptr++;
+            }
+        }
+    }
+
+    /* one last sanity check on the way out */
+    if (stream_ptr < buf_size)
+        av_log(s->avctx, AV_LOG_ERROR, " AASC: ended frame decode with bytes left over (%d < %d)\n",
+            stream_ptr, buf_size);
+
+    *data_size = sizeof(AVFrame);
+    *(AVFrame*)data = s->frame;
+
+    /* report that the buffer was completely consumed */
+    return buf_size;
+}
+
+static int aasc_decode_end(AVCodecContext *avctx)
+{
+    AascContext *s = (AascContext *)avctx->priv_data;
+
+    /* release the last frame */
+    if (s->frame.data[0])
+        avctx->release_buffer(avctx, &s->frame);
+
+    return 0;
+}
+
+AVCodec aasc_decoder = {
+    "aasc",
+    CODEC_TYPE_VIDEO,
+    CODEC_ID_AASC,
+    sizeof(AascContext),
+    aasc_decode_init,
+    NULL,
+    aasc_decode_end,
+    aasc_decode_frame,
+    CODEC_CAP_DR1,
+};

libavcodec/allcodecs.c

@@ -130,6 +130,7 @@ void avcodec_register_all(void)
     register_avcodec(&qpeg_decoder);
     register_avcodec(&loco_decoder);
     register_avcodec(&wnv1_decoder);
+    register_avcodec(&aasc_decoder);
 #ifdef CONFIG_FAAD
     register_avcodec(&aac_decoder);
     register_avcodec(&mpeg4aac_decoder);

libavcodec/avcodec.h

@@ -17,7 +17,7 @@ extern "C" {
 
 #define FFMPEG_VERSION_INT     0x000409
 #define FFMPEG_VERSION         "0.4.9-pre1"
-#define LIBAVCODEC_BUILD       4751
+#define LIBAVCODEC_BUILD       4752
 
 #define LIBAVCODEC_VERSION_INT FFMPEG_VERSION_INT
 #define LIBAVCODEC_VERSION     FFMPEG_VERSION
@@ -106,6 +106,7 @@ enum CodecID {
     CODEC_ID_WMV3,
     CODEC_ID_LOCO,
     CODEC_ID_WNV1,
+    CODEC_ID_AASC,
 
     /* various pcm "codecs" */
     CODEC_ID_PCM_S16LE= 0x10000,
@@ -2015,6 +2016,7 @@ extern AVCodec qpeg_decoder;
 extern AVCodec shorten_decoder;
 extern AVCodec loco_decoder;
 extern AVCodec wnv1_decoder;
+extern AVCodec aasc_decoder;
 extern AVCodec alac_decoder;
 extern AVCodec ws_snd1_decoder;
 

libavformat/avienc.c

@@ -179,6 +179,7 @@ const CodecTag codec_bmp_tags[] = {
     { CODEC_ID_WMV3, MKTAG('W', 'M', 'V', '3') },
     { CODEC_ID_LOCO, MKTAG('L', 'O', 'C', 'O') },
     { CODEC_ID_WNV1, MKTAG('W', 'N', 'V', '1') },
+    { CODEC_ID_AASC, MKTAG('A', 'A', 'S', 'C') },
     { CODEC_ID_RAWVIDEO, 0 },
     { 0, 0 },
 };