diff ffmpeg/libavcodec/lclenc.c @ 10:6840f77b83aa

commit

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ffmpeg/libavcodec/lclenc.c	Sun Apr 21 10:55:35 2013 +0200
@@ -0,0 +1,197 @@
+/*
+ * 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 (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 "libavutil/avassert.h"
+#include "avcodec.h"
+#include "internal.h"
+#include "lcl.h"
+#include "libavutil/internal.h"
+#include "libavutil/mem.h"
+
+#include <zlib.h>
+
+/*
+ * Decoder context
+ */
+typedef struct LclEncContext {
+
+    AVCodecContext *avctx;
+    AVFrame pic;
+
+    // Image type
+    int imgtype;
+    // Compression type
+    int compression;
+    // Flags
+    int flags;
+    z_stream zstream;
+} LclEncContext;
+
+/*
+ *
+ * Encode a frame
+ *
+ */
+static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
+                        const AVFrame *pict, int *got_packet)
+{
+    LclEncContext *c = avctx->priv_data;
+    AVFrame * const p = &c->pic;
+    int i, ret;
+    int zret; // Zlib return code
+    int max_size = deflateBound(&c->zstream, avctx->width * avctx->height * 3);
+
+    if ((ret = ff_alloc_packet2(avctx, pkt, max_size)) < 0)
+            return ret;
+
+    *p = *pict;
+    p->pict_type= AV_PICTURE_TYPE_I;
+    p->key_frame= 1;
+
+    if(avctx->pix_fmt != AV_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  = pkt->data;
+    c->zstream.avail_out = pkt->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;
+    }
+
+    pkt->size   = c->zstream.total_out;
+    pkt->flags |= AV_PKT_FLAG_KEY;
+    *got_packet = 1;
+
+    return 0;
+}
+
+/*
+ *
+ * Init lcl encoder
+ *
+ */
+static av_cold int encode_init(AVCodecContext *avctx)
+{
+    LclEncContext *c = avctx->priv_data;
+    int zret; // Zlib return code
+
+    c->avctx= avctx;
+
+    av_assert0(avctx->width && avctx->height);
+
+    avctx->extradata= av_mallocz(8);
+    avctx->coded_frame= &c->pic;
+
+    c->compression = avctx->compression_level == FF_COMPRESSION_DEFAULT ?
+                            COMP_ZLIB_NORMAL :
+                            av_clip(avctx->compression_level, 0, 9);
+    c->flags = 0;
+    c->imgtype = IMGTYPE_RGB24;
+    avctx->bits_per_coded_sample= 24;
+
+    avctx->extradata[0]= 4;
+    avctx->extradata[1]= 0;
+    avctx->extradata[2]= 0;
+    avctx->extradata[3]= 0;
+    avctx->extradata[4]= c->imgtype;
+    avctx->extradata[5]= c->compression;
+    avctx->extradata[6]= c->flags;
+    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;
+    }
+
+    return 0;
+}
+
+/*
+ *
+ * Uninit lcl encoder
+ *
+ */
+static av_cold int encode_end(AVCodecContext *avctx)
+{
+    LclEncContext *c = avctx->priv_data;
+
+    av_freep(&avctx->extradata);
+    deflateEnd(&c->zstream);
+
+    return 0;
+}
+
+AVCodec ff_zlib_encoder = {
+    .name           = "zlib",
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = AV_CODEC_ID_ZLIB,
+    .priv_data_size = sizeof(LclEncContext),
+    .init           = encode_init,
+    .encode2        = encode_frame,
+    .close          = encode_end,
+    .pix_fmts       = (const enum AVPixelFormat[]) { AV_PIX_FMT_BGR24, AV_PIX_FMT_NONE },
+    .long_name      = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) ZLIB"),
+};