1/*
2 * LCL (LossLess Codec Library) Codec
3 * Copyright (c) 2002-2004 Roberto Togni
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22/**
23 * @file libavcodec/lclenc.c
24 * LCL (LossLess Codec Library) Video Codec
25 * Decoder for MSZH and ZLIB codecs
26 * Experimental encoder for ZLIB RGB24
27 *
28 * Fourcc: MSZH, ZLIB
29 *
30 * Original Win32 dll:
31 * Ver2.23 By Kenji Oshima 2000.09.20
32 * avimszh.dll, avizlib.dll
33 *
34 * A description of the decoding algorithm can be found here:
35 *   http://www.pcisys.net/~melanson/codecs
36 *
37 * Supports: BGR24 (RGB 24bpp)
38 *
39 */
40
41#include <stdio.h>
42#include <stdlib.h>
43
44#include "avcodec.h"
45#include "bitstream.h"
46#include "lcl.h"
47
48#if CONFIG_ZLIB
49#include <zlib.h>
50#endif
51
52/*
53 * Decoder context
54 */
55typedef struct LclEncContext {
56
57        AVCodecContext *avctx;
58        AVFrame pic;
59    PutBitContext pb;
60
61    // Image type
62    int imgtype;
63    // Compression type
64    int compression;
65    // Flags
66    int flags;
67    // Decompressed data size
68    unsigned int decomp_size;
69    // Maximum compressed data size
70    unsigned int max_comp_size;
71    // Compression buffer
72    unsigned char* comp_buf;
73#if CONFIG_ZLIB
74    z_stream zstream;
75#endif
76} LclEncContext;
77
78/*
79 *
80 * Encode a frame
81 *
82 */
83static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
84    LclEncContext *c = avctx->priv_data;
85    AVFrame *pict = data;
86    AVFrame * const p = &c->pic;
87    int i;
88    int zret; // Zlib return code
89
90#if !CONFIG_ZLIB
91    av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled in.\n");
92    return -1;
93#else
94
95    init_put_bits(&c->pb, buf, buf_size);
96
97    *p = *pict;
98    p->pict_type= FF_I_TYPE;
99    p->key_frame= 1;
100
101    if(avctx->pix_fmt != PIX_FMT_BGR24){
102        av_log(avctx, AV_LOG_ERROR, "Format not supported!\n");
103        return -1;
104    }
105
106    zret = deflateReset(&(c->zstream));
107    if (zret != Z_OK) {
108        av_log(avctx, AV_LOG_ERROR, "Deflate reset error: %d\n", zret);
109        return -1;
110    }
111    c->zstream.next_out = c->comp_buf;
112    c->zstream.avail_out = c->max_comp_size;
113
114    for(i = avctx->height - 1; i >= 0; i--) {
115        c->zstream.next_in = p->data[0]+p->linesize[0]*i;
116        c->zstream.avail_in = avctx->width*3;
117        zret = deflate(&(c->zstream), Z_NO_FLUSH);
118        if (zret != Z_OK) {
119            av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret);
120            return -1;
121        }
122    }
123    zret = deflate(&(c->zstream), Z_FINISH);
124    if (zret != Z_STREAM_END) {
125        av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret);
126        return -1;
127    }
128
129    for (i = 0; i < c->zstream.total_out; i++)
130        put_bits(&c->pb, 8, c->comp_buf[i]);
131    flush_put_bits(&c->pb);
132
133    return c->zstream.total_out;
134#endif
135}
136
137/*
138 *
139 * Init lcl encoder
140 *
141 */
142static av_cold int encode_init(AVCodecContext *avctx)
143{
144    LclEncContext *c = avctx->priv_data;
145    int zret; // Zlib return code
146
147#if !CONFIG_ZLIB
148    av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");
149    return 1;
150#else
151
152    c->avctx= avctx;
153
154    assert(avctx->width && avctx->height);
155
156    avctx->extradata= av_mallocz(8);
157    avctx->coded_frame= &c->pic;
158
159    // Will be user settable someday
160    c->compression = 6;
161    c->flags = 0;
162
163    switch(avctx->pix_fmt){
164        case PIX_FMT_BGR24:
165            c->imgtype = IMGTYPE_RGB24;
166            c->decomp_size = avctx->width * avctx->height * 3;
167            avctx->bits_per_coded_sample= 24;
168            break;
169        default:
170            av_log(avctx, AV_LOG_ERROR, "Input pixel format %s not supported\n", avcodec_get_pix_fmt_name(avctx->pix_fmt));
171            return -1;
172    }
173
174    ((uint8_t*)avctx->extradata)[0]= 4;
175    ((uint8_t*)avctx->extradata)[1]= 0;
176    ((uint8_t*)avctx->extradata)[2]= 0;
177    ((uint8_t*)avctx->extradata)[3]= 0;
178    ((uint8_t*)avctx->extradata)[4]= c->imgtype;
179    ((uint8_t*)avctx->extradata)[5]= c->compression;
180    ((uint8_t*)avctx->extradata)[6]= c->flags;
181    ((uint8_t*)avctx->extradata)[7]= CODEC_ZLIB;
182    c->avctx->extradata_size= 8;
183
184    c->zstream.zalloc = Z_NULL;
185    c->zstream.zfree = Z_NULL;
186    c->zstream.opaque = Z_NULL;
187    zret = deflateInit(&(c->zstream), c->compression);
188    if (zret != Z_OK) {
189        av_log(avctx, AV_LOG_ERROR, "Deflate init error: %d\n", zret);
190        return 1;
191    }
192
193        /* Conservative upper bound taken from zlib v1.2.1 source */
194        c->max_comp_size = c->decomp_size + ((c->decomp_size + 7) >> 3) +
195                           ((c->decomp_size + 63) >> 6) + 11;
196    if ((c->comp_buf = av_malloc(c->max_comp_size)) == NULL) {
197        av_log(avctx, AV_LOG_ERROR, "Can't allocate compression buffer.\n");
198        return 1;
199    }
200
201    return 0;
202#endif
203}
204
205/*
206 *
207 * Uninit lcl encoder
208 *
209 */
210static av_cold int encode_end(AVCodecContext *avctx)
211{
212    LclEncContext *c = avctx->priv_data;
213
214    av_freep(&avctx->extradata);
215    av_freep(&c->comp_buf);
216#if CONFIG_ZLIB
217    deflateEnd(&(c->zstream));
218#endif
219
220    return 0;
221}
222
223AVCodec zlib_encoder = {
224    "zlib",
225    CODEC_TYPE_VIDEO,
226    CODEC_ID_ZLIB,
227    sizeof(LclEncContext),
228    encode_init,
229    encode_frame,
230    encode_end,
231    .long_name = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) ZLIB"),
232};
233