CLJR decoding support

Originally committed as revision 2090 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/Makefile

@@ -17,7 +17,7 @@ OBJS= common.o utils.o mem.o allcodecs.o \
       mpeg12.o mpegaudiodec.o pcm.o simple_idct.o \
       ratecontrol.o adpcm.o eval.o dv.o error_resilience.o \
       fft.o mdct.o mace.o huffyuv.o cyuv.o opts.o raw.o h264.o golomb.o \
-      vp3.o asv1.o 4xm.o cabac.o ffv1.o ra144.o ra288.o vcr1.o
+      vp3.o asv1.o 4xm.o cabac.o ffv1.o ra144.o ra288.o vcr1.o cljr.o
 
 ifeq ($(AMR_NB),yes)
 ifeq ($(AMR_NB_FIXED),yes)

libavcodec/allcodecs.c

@@ -114,6 +114,7 @@ void avcodec_register_all(void)
     register_avcodec(&vp3_decoder);
     register_avcodec(&asv1_decoder);
     register_avcodec(&vcr1_decoder);
+    register_avcodec(&cljr_decoder);
     register_avcodec(&fourxm_decoder);
 #ifdef CONFIG_AC3
     register_avcodec(&ac3_decoder);

libavcodec/avcodec.h

@@ -62,6 +62,7 @@ enum CodecID {
     CODEC_ID_FFV1,
     CODEC_ID_4XM,
     CODEC_ID_VCR1,
+    CODEC_ID_CLJR,
 
     /* various pcm "codecs" */
     CODEC_ID_PCM_S16LE,
@@ -1307,6 +1308,7 @@ extern AVCodec aac_decoder;
 extern AVCodec mpeg4aac_decoder;
 extern AVCodec asv1_decoder;
 extern AVCodec vcr1_decoder;
+extern AVCodec cljr_decoder;
 extern AVCodec ffv1_decoder;
 extern AVCodec fourxm_decoder;
 extern AVCodec ra_144_decoder;

libavcodec/cljr.c

@@ -0,0 +1,177 @@
+/*
+ * Cirrus Logic AccuPak (CLJR) codec
+ * Copyright (c) 2003 Alex Beregszaszi
+ *
+ * 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 cljr.c
+ * Cirrus Logic AccuPak codec.
+ */
+ 
+#include "avcodec.h"
+#include "mpegvideo.h"
+
+typedef struct CLJRContext{
+    AVCodecContext *avctx;
+    AVFrame picture;
+    int delta[16];
+    int offset[4];
+    GetBitContext gb;
+} CLJRContext;
+
+static int decode_frame(AVCodecContext *avctx, 
+                        void *data, int *data_size,
+                        uint8_t *buf, int buf_size)
+{
+    CLJRContext * const a = avctx->priv_data;
+    AVFrame *picture = data;
+    AVFrame * const p= (AVFrame*)&a->picture;
+    uint8_t *bytestream= buf;
+    int i, x, y;
+
+    *data_size = 0;
+
+    /* special case for last picture */
+    if (buf_size == 0) {
+        return 0;
+    }
+
+    if(p->data[0])
+        avctx->release_buffer(avctx, p);
+
+    p->reference= 0;
+    if(avctx->get_buffer(avctx, p) < 0){
+        fprintf(stderr, "get_buffer() failed\n");
+        return -1;
+    }
+    p->pict_type= I_TYPE;
+    p->key_frame= 1;
+
+    init_get_bits(&a->gb, buf, buf_size);
+
+    for(y=0; y<avctx->height; y++){
+        int offset;
+        uint8_t *luma= &a->picture.data[0][ y*a->picture.linesize[0] ];
+        uint8_t *cb= &a->picture.data[1][ (y>>2)*a->picture.linesize[1] ];
+        uint8_t *cr= &a->picture.data[2][ (y>>2)*a->picture.linesize[2] ];
+
+        for(x=0; x<avctx->width; x+=4){
+    	    luma[3] = get_bits(&a->gb, 5) << 3;
+	    luma[2] = get_bits(&a->gb, 5) << 3;
+	    luma[1] = get_bits(&a->gb, 5) << 3;
+	    luma[0] = get_bits(&a->gb, 5) << 3;
+	    luma+= 4;
+	    *(cb++) = get_bits(&a->gb, 6) << 2;
+	    *(cr++) = get_bits(&a->gb, 6) << 2;
+        }
+    }
+
+    *picture= *(AVFrame*)&a->picture;
+    *data_size = sizeof(AVPicture);
+
+    emms_c();
+    
+    return buf_size;
+}
+
+#if 0
+static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
+    CLJRContext * const a = avctx->priv_data;
+    AVFrame *pict = data;
+    AVFrame * const p= (AVFrame*)&a->picture;
+    int size;
+    int mb_x, mb_y;
+
+    *p = *pict;
+    p->pict_type= I_TYPE;
+    p->key_frame= 1;
+
+    emms_c();
+    
+    align_put_bits(&a->pb);
+    while(get_bit_count(&a->pb)&31)
+        put_bits(&a->pb, 8, 0);
+    
+    size= get_bit_count(&a->pb)/32;
+    
+    return size*4;
+}
+#endif
+
+static void common_init(AVCodecContext *avctx){
+    CLJRContext * const a = avctx->priv_data;
+
+    avctx->coded_frame= (AVFrame*)&a->picture;
+    a->avctx= avctx;
+}
+
+static int decode_init(AVCodecContext *avctx){
+    CLJRContext * const a = avctx->priv_data;
+    AVFrame *p= (AVFrame*)&a->picture;
+    int i;
+ 
+    common_init(avctx);
+    
+    avctx->pix_fmt= PIX_FMT_YUV410P;
+
+    return 0;
+}
+
+static int encode_init(AVCodecContext *avctx){
+    CLJRContext * const a = avctx->priv_data;
+    int i;
+ 
+    common_init(avctx);
+    
+    return 0;
+}
+
+static int decode_end(AVCodecContext *avctx){
+    CLJRContext * const a = avctx->priv_data;
+
+    avcodec_default_free_buffers(avctx);
+
+    return 0;
+}
+
+AVCodec cljr_decoder = {
+    "cljr",
+    CODEC_TYPE_VIDEO,
+    CODEC_ID_CLJR,
+    sizeof(CLJRContext),
+    decode_init,
+    NULL,
+    decode_end,
+    decode_frame,
+    CODEC_CAP_DR1,
+};
+#if 0
+#ifdef CONFIG_ENCODERS
+
+AVCodec cljr_encoder = {
+    "cljr",
+    CODEC_TYPE_VIDEO,
+    CODEC_ID_cljr,
+    sizeof(CLJRContext),
+    encode_init,
+    encode_frame,
+    //encode_end,
+};
+
+#endif //CONFIG_ENCODERS
+#endif