FFmpeg  2.1.1
lclenc.c
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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 
59 
60  // Image type
61  int imgtype;
62  // Compression type
64  // Flags
65  int flags;
66  z_stream zstream;
68 
69 /*
70  *
71  * Encode a frame
72  *
73  */
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  */
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 
135  if (!avctx->extradata)
136  return AVERROR(ENOMEM);
137 
140  av_clip(avctx->compression_level, 0, 9);
141  c->flags = 0;
142  c->imgtype = IMGTYPE_RGB24;
143  avctx->bits_per_coded_sample= 24;
144 
145  avctx->extradata[0]= 4;
146  avctx->extradata[1]= 0;
147  avctx->extradata[2]= 0;
148  avctx->extradata[3]= 0;
149  avctx->extradata[4]= c->imgtype;
150  avctx->extradata[5]= c->compression;
151  avctx->extradata[6]= c->flags;
152  avctx->extradata[7]= CODEC_ZLIB;
153  c->avctx->extradata_size= 8;
154 
155  c->zstream.zalloc = Z_NULL;
156  c->zstream.zfree = Z_NULL;
157  c->zstream.opaque = Z_NULL;
158  zret = deflateInit(&c->zstream, c->compression);
159  if (zret != Z_OK) {
160  av_log(avctx, AV_LOG_ERROR, "Deflate init error: %d\n", zret);
161  return 1;
162  }
163 
164  return 0;
165 }
166 
167 /*
168  *
169  * Uninit lcl encoder
170  *
171  */
173 {
174  LclEncContext *c = avctx->priv_data;
175 
176  av_freep(&avctx->extradata);
177  deflateEnd(&c->zstream);
178 
179  return 0;
180 }
181 
183  .name = "zlib",
184  .long_name = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) ZLIB"),
185  .type = AVMEDIA_TYPE_VIDEO,
186  .id = AV_CODEC_ID_ZLIB,
187  .priv_data_size = sizeof(LclEncContext),
188  .init = encode_init,
189  .encode2 = encode_frame,
190  .close = encode_end,
191  .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_BGR24, AV_PIX_FMT_NONE },
192 };
int ff_alloc_packet2(AVCodecContext *avctx, AVPacket *avpkt, int64_t size)
Check AVPacket size and/or allocate data.
Definition: utils.c:1500
This structure describes decoded (raw) audio or video data.
Definition: frame.h:96
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
static av_cold int encode_end(AVCodecContext *avctx)
Definition: lclenc.c:172
int size
Definition: avcodec.h:1064
void av_log(void *avcl, int level, const char *fmt,...) av_printf_format(3
Send the specified message to the log if the level is less than or equal to the current av_log_level...
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1342
static av_cold int encode_init(AVCodecContext *avctx)
Definition: lclenc.c:125
int compression
Definition: lclenc.c:63
Pixel format.
Definition: avcodec.h:4533
AVCodec.
Definition: avcodec.h:2922
#define av_cold
Definition: avcodec.h:653
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1254
void av_freep(void *ptr)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc() and set the pointer ...
Definition: mem.c:234
packed RGB 8:8:8, 24bpp, BGRBGR...
Definition: avcodec.h:4537
int imgtype
Definition: lclenc.c:61
AVCodec ff_zlib_encoder
Definition: lclenc.c:182
const char * name
Name of the codec implementation.
Definition: avcodec.h:2929
#define COMP_ZLIB_NORMAL
Definition: lcl.h:39
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:2563
#define FF_COMPRESSION_DEFAULT
Definition: avcodec.h:1227
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1113
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: avcodec.h:4147
int flags
Definition: lclenc.c:65
#define CODEC_ZLIB
Definition: lcl.h:47
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:151
#define IMGTYPE_RGB24
Definition: lcl.h:30
Libavcodec external API header.
AVPixelFormat
Pixel format.
Definition: pixfmt.h:66
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1069
AVCodecContext * avctx
Definition: lclenc.c:58
common internal API header
#define FF_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:580
ret
Definition: avfilter.c:961
int width
picture width / height.
Definition: avcodec.h:1314
z_stream zstream
Definition: lclenc.c:66
int AC3_NAME() encode_frame(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame, int *got_packet_ptr)
int compression_level
Definition: avcodec.h:1226
main external API structure.
Definition: avcodec.h:1146
static void close(AVCodecParserContext *s)
Definition: h264_parser.c:538
int extradata_size
Definition: avcodec.h:1255
uint8_t * data
Definition: avcodec.h:1063
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:124
void * priv_data
Definition: avcodec.h:1182
common internal api header.
static double c[64]
#define AVERROR(e)
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
static AVPacket pkt
Definition: demuxing.c:52
This structure stores compressed data.
Definition: avcodec.h:1040
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:107
void * av_mallocz(size_t size) av_malloc_attrib 1(1)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:241