split lcl.c into lcldec.c, lclenc.c, lcl.h

Originally committed as revision 9613 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 231 insertions, 0 deletions

diff --git a/libavcodec/lclenc.c b/libavcodec/lclenc.c
new file mode 100644
index 0000000000..e8349052af
--- /dev/null
+++ b/libavcodec/lclenc.c
@@ -0,0 +1,231 @@
+/*
+ * LCL (LossLess Codec Library) Codec
+ * Copyright (c) 2002-2004 Roberto Togni
+ *
+ * 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 lcl.c
+ * LCL (LossLess Codec Library) Video Codec
+ * Decoder for MSZH and ZLIB codecs
+ * Experimental encoder for ZLIB RGB24
+ *
+ * Fourcc: MSZH, ZLIB
+ *
+ * Original Win32 dll:
+ * Ver2.23 By Kenji Oshima 2000.09.20
+ * avimszh.dll, avizlib.dll
+ *
+ * A description of the decoding algorithm can be found here:
+ *   http://www.pcisys.net/~melanson/codecs
+ *
+ * Supports: BGR24 (RGB 24bpp)
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "avcodec.h"
+#include "bitstream.h"
+#include "lcl.h"
+
+#ifdef CONFIG_ZLIB
+#include <zlib.h>
+#endif
+
+/*
+ * Decoder context
+ */
+typedef struct LclEncContext {
+
+        AVCodecContext *avctx;
+        AVFrame pic;
+    PutBitContext pb;
+
+    // Image type
+    int imgtype;
+    // Compression type
+    int compression;
+    // Flags
+    int flags;
+    // Decompressed data size
+    unsigned int decomp_size;
+    // Maximum compressed data size
+    unsigned int max_comp_size;
+    // Compression buffer
+    unsigned char* comp_buf;
+#ifdef CONFIG_ZLIB
+    z_stream zstream;
+#endif
+} LclEncContext;
+
+/*
+ *
+ * Encode a frame
+ *
+ */
+static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
+    LclEncContext *c = avctx->priv_data;
+    AVFrame *pict = data;
+    AVFrame * const p = &c->pic;
+    int i;
+    int zret; // Zlib return code
+
+#ifndef CONFIG_ZLIB
+    av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled in.\n");
+    return -1;
+#else
+
+    init_put_bits(&c->pb, buf, buf_size);
+
+    *p = *pict;
+    p->pict_type= FF_I_TYPE;
+    p->key_frame= 1;
+
+    if(avctx->pix_fmt != PIX_FMT_BGR24){
+        av_log(avctx, AV_LOG_ERROR, "Format not supported!\n");
+        return -1;
+    }
+
+    zret = deflateReset(&(c->zstream));
+    if (zret != Z_OK) {
+        av_log(avctx, AV_LOG_ERROR, "Deflate reset error: %d\n", zret);
+        return -1;
+    }
+    c->zstream.next_out = c->comp_buf;
+    c->zstream.avail_out = c->max_comp_size;
+
+    for(i = avctx->height - 1; i >= 0; i--) {
+        c->zstream.next_in = p->data[0]+p->linesize[0]*i;
+        c->zstream.avail_in = avctx->width*3;
+        zret = deflate(&(c->zstream), Z_NO_FLUSH);
+        if (zret != Z_OK) {
+            av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret);
+            return -1;
+        }
+    }
+    zret = deflate(&(c->zstream), Z_FINISH);
+    if (zret != Z_STREAM_END) {
+        av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret);
+        return -1;
+    }
+
+    for (i = 0; i < c->zstream.total_out; i++)
+        put_bits(&c->pb, 8, c->comp_buf[i]);
+    flush_put_bits(&c->pb);
+
+    return c->zstream.total_out;
+#endif
+}
+
+/*
+ *
+ * Init lcl encoder
+ *
+ */
+static int encode_init(AVCodecContext *avctx)
+{
+    LclEncContext *c = avctx->priv_data;
+    int zret; // Zlib return code
+
+#ifndef CONFIG_ZLIB
+    av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");
+    return 1;
+#else
+
+    c->avctx= avctx;
+
+    assert(avctx->width && avctx->height);
+
+    avctx->extradata= av_mallocz(8);
+    avctx->coded_frame= &c->pic;
+
+    // Will be user settable someday
+    c->compression = 6;
+    c->flags = 0;
+
+    switch(avctx->pix_fmt){
+        case PIX_FMT_BGR24:
+            c->imgtype = IMGTYPE_RGB24;
+            c->decomp_size = avctx->width * avctx->height * 3;
+            avctx->bits_per_sample= 24;
+            break;
+        default:
+            av_log(avctx, AV_LOG_ERROR, "Format %d not supported\n", avctx->pix_fmt);
+            return -1;
+    }
+
+    ((uint8_t*)avctx->extradata)[0]= 4;
+    ((uint8_t*)avctx->extradata)[1]= 0;
+    ((uint8_t*)avctx->extradata)[2]= 0;
+    ((uint8_t*)avctx->extradata)[3]= 0;
+    ((uint8_t*)avctx->extradata)[4]= c->imgtype;
+    ((uint8_t*)avctx->extradata)[5]= c->compression;
+    ((uint8_t*)avctx->extradata)[6]= c->flags;
+    ((uint8_t*)avctx->extradata)[7]= CODEC_ZLIB;
+    c->avctx->extradata_size= 8;
+
+    c->zstream.zalloc = Z_NULL;
+    c->zstream.zfree = Z_NULL;
+    c->zstream.opaque = Z_NULL;
+    zret = deflateInit(&(c->zstream), c->compression);
+    if (zret != Z_OK) {
+        av_log(avctx, AV_LOG_ERROR, "Deflate init error: %d\n", zret);
+        return 1;
+    }
+
+        /* Conservative upper bound taken from zlib v1.2.1 source */
+        c->max_comp_size = c->decomp_size + ((c->decomp_size + 7) >> 3) +
+                           ((c->decomp_size + 63) >> 6) + 11;
+    if ((c->comp_buf = av_malloc(c->max_comp_size)) == NULL) {
+        av_log(avctx, AV_LOG_ERROR, "Can't allocate compression buffer.\n");
+        return 1;
+    }
+
+    return 0;
+#endif
+}
+
+/*
+ *
+ * Uninit lcl encoder
+ *
+ */
+static int encode_end(AVCodecContext *avctx)
+{
+    LclEncContext *c = avctx->priv_data;
+
+    av_freep(&avctx->extradata);
+    av_freep(&c->comp_buf);
+#ifdef CONFIG_ZLIB
+    deflateEnd(&(c->zstream));
+#endif
+
+    return 0;
+}
+
+AVCodec zlib_encoder = {
+    "zlib",
+    CODEC_TYPE_VIDEO,
+    CODEC_ID_ZLIB,
+    sizeof(LclEncContext),
+    encode_init,
+    encode_frame,
+    encode_end,
+};