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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 #include <stdio.h>
41 #include <stdlib.h>
42 
43 #include "libavutil/avassert.h"
44 #include "avcodec.h"
45 #include "internal.h"
46 #include "lcl.h"
47 #include "libavutil/internal.h"
48 #include "libavutil/mem.h"
49 
50 #include <zlib.h>
51 
52 typedef struct LclEncContext {
53 
55 
56  // Image type
57  int imgtype;
58  // Compression type
60  // Flags
61  int flags;
62  z_stream zstream;
64 
66  const AVFrame *p, int *got_packet)
67 {
68  LclEncContext *c = avctx->priv_data;
69  int i, ret;
70  int zret; // Zlib return code
71  int max_size = deflateBound(&c->zstream, avctx->width * avctx->height * 3);
72 
73  if ((ret = ff_alloc_packet2(avctx, pkt, max_size, 0)) < 0)
74  return ret;
75 
76  if(avctx->pix_fmt != AV_PIX_FMT_BGR24){
77  av_log(avctx, AV_LOG_ERROR, "Format not supported!\n");
78  return -1;
79  }
80 
81  zret = deflateReset(&c->zstream);
82  if (zret != Z_OK) {
83  av_log(avctx, AV_LOG_ERROR, "Deflate reset error: %d\n", zret);
84  return -1;
85  }
86  c->zstream.next_out = pkt->data;
87  c->zstream.avail_out = pkt->size;
88 
89  for(i = avctx->height - 1; i >= 0; i--) {
90  c->zstream.next_in = p->data[0]+p->linesize[0]*i;
91  c->zstream.avail_in = avctx->width*3;
92  zret = deflate(&c->zstream, Z_NO_FLUSH);
93  if (zret != Z_OK) {
94  av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret);
95  return -1;
96  }
97  }
98  zret = deflate(&c->zstream, Z_FINISH);
99  if (zret != Z_STREAM_END) {
100  av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret);
101  return -1;
102  }
103 
104  pkt->size = c->zstream.total_out;
105  pkt->flags |= AV_PKT_FLAG_KEY;
106  *got_packet = 1;
107 
108  return 0;
109 }
110 
112 {
113  LclEncContext *c = avctx->priv_data;
114  int zret; // Zlib return code
115 
116  c->avctx= avctx;
117 
118  av_assert0(avctx->width && avctx->height);
119 
121  if (!avctx->extradata)
122  return AVERROR(ENOMEM);
123 
124 #if FF_API_CODED_FRAME
127  avctx->coded_frame->key_frame = 1;
129 #endif
130 
133  av_clip(avctx->compression_level, 0, 9);
134  c->flags = 0;
135  c->imgtype = IMGTYPE_RGB24;
136  avctx->bits_per_coded_sample= 24;
137 
138  avctx->extradata[0]= 4;
139  avctx->extradata[1]= 0;
140  avctx->extradata[2]= 0;
141  avctx->extradata[3]= 0;
142  avctx->extradata[4]= c->imgtype;
143  avctx->extradata[5]= c->compression;
144  avctx->extradata[6]= c->flags;
145  avctx->extradata[7]= CODEC_ZLIB;
146  c->avctx->extradata_size= 8;
147 
148  c->zstream.zalloc = Z_NULL;
149  c->zstream.zfree = Z_NULL;
150  c->zstream.opaque = Z_NULL;
151  zret = deflateInit(&c->zstream, c->compression);
152  if (zret != Z_OK) {
153  av_log(avctx, AV_LOG_ERROR, "Deflate init error: %d\n", zret);
154  return AVERROR_UNKNOWN;
155  }
156 
157  return 0;
158 }
159 
161 {
162  LclEncContext *c = avctx->priv_data;
163 
164  av_freep(&avctx->extradata);
165  deflateEnd(&c->zstream);
166 
167  return 0;
168 }
169 
171  .name = "zlib",
172  .long_name = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) ZLIB"),
173  .type = AVMEDIA_TYPE_VIDEO,
174  .id = AV_CODEC_ID_ZLIB,
175  .priv_data_size = sizeof(LclEncContext),
176  .init = encode_init,
177  .encode2 = encode_frame,
178  .close = encode_end,
181  .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE |
183 };
#define FF_CODEC_CAP_INIT_CLEANUP
The codec allows calling the close function for deallocation even if the init function returned a fai...
Definition: internal.h:48
#define FF_COMPRESSION_DEFAULT
Definition: avcodec.h:1561
This structure describes decoded (raw) audio or video data.
Definition: frame.h:201
Memory handling functions.
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
static av_cold int encode_end(AVCodecContext *avctx)
Definition: lclenc.c:160
int size
Definition: avcodec.h:1401
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1697
static av_cold int encode_init(AVCodecContext *avctx)
Definition: lclenc.c:111
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:236
static AVPacket pkt
int compression
Definition: lclenc.c:59
AVCodec.
Definition: avcodec.h:3351
#define AV_CODEC_CAP_INTRA_ONLY
Codec is intra only.
Definition: avcodec.h:1042
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
int ff_alloc_packet2(AVCodecContext *avctx, AVPacket *avpkt, int64_t size, int64_t min_size)
Check AVPacket size and/or allocate data.
Definition: encode.c:32
static int encode_frame(AVCodecContext *avctx, AVPacket *pkt, const AVFrame *p, int *got_packet)
Definition: lclenc.c:65
#define FF_CODEC_CAP_INIT_THREADSAFE
The codec does not modify any global variables in the init function, allowing to call the init functi...
Definition: internal.h:40
int imgtype
Definition: lclenc.c:57
#define av_cold
Definition: attributes.h:82
static void deflate(uint8_t *dst, const uint8_t *p1, int width, int threshold, const uint8_t *coordinates[], int coord)
Definition: vf_neighbor.c:114
AVCodec ff_zlib_encoder
Definition: lclenc.c:170
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1588
#define COMP_ZLIB_NORMAL
Definition: lcl.h:39
uint8_t * data
Definition: avcodec.h:1400
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:2704
#define av_log(a,...)
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1432
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
int flags
Definition: lclenc.c:61
#define CODEC_ZLIB
Definition: lcl.h:47
#define AVERROR(e)
Definition: error.h:43
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
#define IMGTYPE_RGB24
Definition: lcl.h:30
simple assert() macros that are a bit more flexible than ISO C assert().
const char * name
Name of the codec implementation.
Definition: avcodec.h:3358
#define AV_CODEC_CAP_FRAME_THREADS
Codec supports frame-level multithreading.
Definition: avcodec.h:1012
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1406
AVCodecContext * avctx
Definition: lclenc.c:54
common internal API header
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:284
int width
picture width / height.
Definition: avcodec.h:1660
packed RGB 8:8:8, 24bpp, BGRBGR...
Definition: pixfmt.h:65
z_stream zstream
Definition: lclenc.c:62
Libavcodec external API header.
int compression_level
Definition: avcodec.h:1560
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:232
main external API structure.
Definition: avcodec.h:1488
int extradata_size
Definition: avcodec.h:1589
static enum AVPixelFormat pix_fmts[]
Definition: libkvazaar.c:266
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:215
#define FF_DISABLE_DEPRECATION_WARNINGS
Definition: internal.h:84
common internal api header.
static double c[64]
attribute_deprecated AVFrame * coded_frame
the picture in the bitstream
Definition: avcodec.h:2730
#define AVERROR_UNKNOWN
Unknown error, typically from an external library.
Definition: error.h:71
#define AV_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:770
void * priv_data
Definition: avcodec.h:1515
#define FF_ENABLE_DEPRECATION_WARNINGS
Definition: internal.h:85
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:279
#define av_freep(p)
AVPixelFormat
Pixel format.
Definition: pixfmt.h:60
This structure stores compressed data.
Definition: avcodec.h:1377