Imported Debian version 2.5.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / lclenc.c
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
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 "libavutil/avassert.h"
45 #include "avcodec.h"
46 #include "internal.h"
47 #include "lcl.h"
48 #include "libavutil/internal.h"
49 #include "libavutil/mem.h"
50
51 #include <zlib.h>
52
53 /*
54 * Decoder context
55 */
56 typedef struct LclEncContext {
57
58 AVCodecContext *avctx;
59
60 // Image type
61 int imgtype;
62 // Compression type
63 int compression;
64 // Flags
65 int flags;
66 z_stream zstream;
67 } LclEncContext;
68
69 /*
70 *
71 * Encode a frame
72 *
73 */
74 static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
75 const AVFrame *p, int *got_packet)
76 {
77 LclEncContext *c = avctx->priv_data;
78 int i, ret;
79 int zret; // Zlib return code
80 int max_size = deflateBound(&c->zstream, avctx->width * avctx->height * 3);
81
82 if ((ret = ff_alloc_packet2(avctx, pkt, max_size)) < 0)
83 return ret;
84
85 if(avctx->pix_fmt != AV_PIX_FMT_BGR24){
86 av_log(avctx, AV_LOG_ERROR, "Format not supported!\n");
87 return -1;
88 }
89
90 zret = deflateReset(&c->zstream);
91 if (zret != Z_OK) {
92 av_log(avctx, AV_LOG_ERROR, "Deflate reset error: %d\n", zret);
93 return -1;
94 }
95 c->zstream.next_out = pkt->data;
96 c->zstream.avail_out = pkt->size;
97
98 for(i = avctx->height - 1; i >= 0; i--) {
99 c->zstream.next_in = p->data[0]+p->linesize[0]*i;
100 c->zstream.avail_in = avctx->width*3;
101 zret = deflate(&c->zstream, Z_NO_FLUSH);
102 if (zret != Z_OK) {
103 av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret);
104 return -1;
105 }
106 }
107 zret = deflate(&c->zstream, Z_FINISH);
108 if (zret != Z_STREAM_END) {
109 av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret);
110 return -1;
111 }
112
113 pkt->size = c->zstream.total_out;
114 pkt->flags |= AV_PKT_FLAG_KEY;
115 *got_packet = 1;
116
117 return 0;
118 }
119
120 /*
121 *
122 * Init lcl encoder
123 *
124 */
125 static av_cold int encode_init(AVCodecContext *avctx)
126 {
127 LclEncContext *c = avctx->priv_data;
128 int zret; // Zlib return code
129
130 c->avctx= avctx;
131
132 av_assert0(avctx->width && avctx->height);
133
134 avctx->extradata = av_mallocz(8 + FF_INPUT_BUFFER_PADDING_SIZE);
135 if (!avctx->extradata)
136 return AVERROR(ENOMEM);
137
138 avctx->coded_frame = av_frame_alloc();
139 if (!avctx->coded_frame)
140 return AVERROR(ENOMEM);
141
142 avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
143 avctx->coded_frame->key_frame = 1;
144
145 c->compression = avctx->compression_level == FF_COMPRESSION_DEFAULT ?
146 COMP_ZLIB_NORMAL :
147 av_clip(avctx->compression_level, 0, 9);
148 c->flags = 0;
149 c->imgtype = IMGTYPE_RGB24;
150 avctx->bits_per_coded_sample= 24;
151
152 avctx->extradata[0]= 4;
153 avctx->extradata[1]= 0;
154 avctx->extradata[2]= 0;
155 avctx->extradata[3]= 0;
156 avctx->extradata[4]= c->imgtype;
157 avctx->extradata[5]= c->compression;
158 avctx->extradata[6]= c->flags;
159 avctx->extradata[7]= CODEC_ZLIB;
160 c->avctx->extradata_size= 8;
161
162 c->zstream.zalloc = Z_NULL;
163 c->zstream.zfree = Z_NULL;
164 c->zstream.opaque = Z_NULL;
165 zret = deflateInit(&c->zstream, c->compression);
166 if (zret != Z_OK) {
167 av_log(avctx, AV_LOG_ERROR, "Deflate init error: %d\n", zret);
168 return 1;
169 }
170
171 return 0;
172 }
173
174 /*
175 *
176 * Uninit lcl encoder
177 *
178 */
179 static av_cold int encode_end(AVCodecContext *avctx)
180 {
181 LclEncContext *c = avctx->priv_data;
182
183 av_freep(&avctx->extradata);
184 deflateEnd(&c->zstream);
185
186 av_frame_free(&avctx->coded_frame);
187
188 return 0;
189 }
190
191 AVCodec ff_zlib_encoder = {
192 .name = "zlib",
193 .long_name = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) ZLIB"),
194 .type = AVMEDIA_TYPE_VIDEO,
195 .id = AV_CODEC_ID_ZLIB,
196 .priv_data_size = sizeof(LclEncContext),
197 .init = encode_init,
198 .encode2 = encode_frame,
199 .close = encode_end,
200 .capabilities = CODEC_CAP_FRAME_THREADS | CODEC_CAP_INTRA_ONLY,
201 .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_BGR24, AV_PIX_FMT_NONE },
202 };