lclenc.c
Go to the documentation of this file.
1 /*
2  * LCL (LossLess Codec Library) Codec
3  * Copyright (c) 2002-2004 Roberto Togni
4  *
5  * This file is part of Libav.
6  *
7  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
41 #include <stdio.h>
42 #include <stdlib.h>
43 
44 #include "avcodec.h"
45 #include "lcl.h"
46 #include "libavutil/internal.h"
47 #include "libavutil/mem.h"
48 
49 #include <zlib.h>
50 
51 /*
52  * Decoder context
53  */
54 typedef struct LclEncContext {
55 
58 
59  // Image type
60  int imgtype;
61  // Compression type
63  // Flags
64  int flags;
65  z_stream zstream;
67 
68 /*
69  *
70  * Encode a frame
71  *
72  */
73 static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
74  const AVFrame *pict, int *got_packet)
75 {
76  LclEncContext *c = avctx->priv_data;
77  AVFrame * const p = &c->pic;
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 (!pkt->data &&
83  (ret = av_new_packet(pkt, max_size)) < 0) {
84  av_log(avctx, AV_LOG_ERROR, "Error allocating packet of size %d.\n", max_size);
85  return ret;
86  }
87 
88  *p = *pict;
90  p->key_frame= 1;
91 
92  if(avctx->pix_fmt != AV_PIX_FMT_BGR24){
93  av_log(avctx, AV_LOG_ERROR, "Format not supported!\n");
94  return -1;
95  }
96 
97  zret = deflateReset(&c->zstream);
98  if (zret != Z_OK) {
99  av_log(avctx, AV_LOG_ERROR, "Deflate reset error: %d\n", zret);
100  return -1;
101  }
102  c->zstream.next_out = pkt->data;
103  c->zstream.avail_out = pkt->size;
104 
105  for(i = avctx->height - 1; i >= 0; i--) {
106  c->zstream.next_in = p->data[0]+p->linesize[0]*i;
107  c->zstream.avail_in = avctx->width*3;
108  zret = deflate(&c->zstream, Z_NO_FLUSH);
109  if (zret != Z_OK) {
110  av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret);
111  return -1;
112  }
113  }
114  zret = deflate(&c->zstream, Z_FINISH);
115  if (zret != Z_STREAM_END) {
116  av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret);
117  return -1;
118  }
119 
120  pkt->size = c->zstream.total_out;
121  pkt->flags |= AV_PKT_FLAG_KEY;
122  *got_packet = 1;
123 
124  return 0;
125 }
126 
127 /*
128  *
129  * Init lcl encoder
130  *
131  */
133 {
134  LclEncContext *c = avctx->priv_data;
135  int zret; // Zlib return code
136 
137  c->avctx= avctx;
138 
139  assert(avctx->width && avctx->height);
140 
141  avctx->extradata= av_mallocz(8);
142  avctx->coded_frame= &c->pic;
143 
144  // Will be user settable someday
145  c->compression = 6;
146  c->flags = 0;
147  c->imgtype = IMGTYPE_RGB24;
148  avctx->bits_per_coded_sample= 24;
149 
150  avctx->extradata[0]= 4;
151  avctx->extradata[1]= 0;
152  avctx->extradata[2]= 0;
153  avctx->extradata[3]= 0;
154  avctx->extradata[4]= c->imgtype;
155  avctx->extradata[5]= c->compression;
156  avctx->extradata[6]= c->flags;
157  avctx->extradata[7]= CODEC_ZLIB;
158  c->avctx->extradata_size= 8;
159 
160  c->zstream.zalloc = Z_NULL;
161  c->zstream.zfree = Z_NULL;
162  c->zstream.opaque = Z_NULL;
163  zret = deflateInit(&c->zstream, c->compression);
164  if (zret != Z_OK) {
165  av_log(avctx, AV_LOG_ERROR, "Deflate init error: %d\n", zret);
166  return 1;
167  }
168 
169  return 0;
170 }
171 
172 /*
173  *
174  * Uninit lcl encoder
175  *
176  */
178 {
179  LclEncContext *c = avctx->priv_data;
180 
181  av_freep(&avctx->extradata);
182  deflateEnd(&c->zstream);
183 
184  return 0;
185 }
186 
188  .name = "zlib",
189  .type = AVMEDIA_TYPE_VIDEO,
190  .id = AV_CODEC_ID_ZLIB,
191  .priv_data_size = sizeof(LclEncContext),
192  .init = encode_init,
193  .encode2 = encode_frame,
194  .close = encode_end,
195  .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_BGR24, AV_PIX_FMT_NONE },
196  .long_name = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) ZLIB"),
197 };
This structure describes decoded (raw) audio or video data.
Definition: avcodec.h:989
memory handling functions
AVFrame * coded_frame
the picture in the bitstream
Definition: avcodec.h:2725
static av_cold int encode_end(AVCodecContext *avctx)
Definition: lclenc.c:177
int size
Definition: avcodec.h:916
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1533
static av_cold int encode_init(AVCodecContext *avctx)
Definition: lclenc.c:132
int compression
Definition: lclenc.c:62
AVCodec.
Definition: avcodec.h:2960
void av_freep(void *arg)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc() and set the pointer ...
Definition: mem.c:151
int imgtype
Definition: lclenc.c:60
AVCodec ff_zlib_encoder
Definition: lclenc.c:187
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1454
uint8_t * data
Definition: avcodec.h:915
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:2704
static int init(AVCodecParserContext *s)
Definition: h264_parser.c:335
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:56
int flags
Definition: lclenc.c:64
#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:88
#define IMGTYPE_RGB24
Definition: lcl.h:30
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:146
const char * name
Name of the codec implementation.
Definition: avcodec.h:2967
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:921
AVCodecContext * avctx
Definition: lclenc.c:56
common internal API header
enum AVPictureType pict_type
Picture type of the frame, see ?_TYPE below.
Definition: avcodec.h:1065
int width
picture width / height.
Definition: avcodec.h:1508
packed RGB 8:8:8, 24bpp, BGRBGR...
Definition: pixfmt.h:68
z_stream zstream
Definition: lclenc.c:65
external API header
int linesize[AV_NUM_DATA_POINTERS]
Size, in bytes, of the data for each picture/channel plane.
Definition: avcodec.h:1008
main external API structure.
Definition: avcodec.h:1339
static void close(AVCodecParserContext *s)
Definition: h264_parser.c:326
int extradata_size
Definition: avcodec.h:1455
struct LclEncContext LclEncContext
static int encode_frame(AVCodecContext *avctx, AVPacket *pkt, const AVFrame *pict, int *got_packet)
Definition: lclenc.c:73
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: avcodec.h:997
void * priv_data
Definition: avcodec.h:1382
int key_frame
1 -> keyframe, 0-> not
Definition: avcodec.h:1058
AVFrame pic
Definition: lclenc.c:57
AVPixelFormat
Pixel format.
Definition: pixfmt.h:63
This structure stores compressed data.
Definition: avcodec.h:898
void * av_mallocz(size_t size)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:158