Libav
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 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 
40 #include <stdio.h>
41 #include <stdlib.h>
42 
43 #include "avcodec.h"
44 #include "internal.h"
45 #include "lcl.h"
46 #include "libavutil/internal.h"
47 #include "libavutil/mem.h"
48 
49 #include <zlib.h>
50 
51 typedef struct LclEncContext {
52 
54 
55  // Image type
56  int imgtype;
57  // Compression type
59  // Flags
60  int flags;
61  z_stream zstream;
63 
65  const AVFrame *pict, int *got_packet)
66 {
67  LclEncContext *c = avctx->priv_data;
68  const AVFrame * const p = pict;
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 (!pkt->data &&
74  (ret = av_new_packet(pkt, max_size)) < 0) {
75  av_log(avctx, AV_LOG_ERROR, "Error allocating packet of size %d.\n", max_size);
76  return ret;
77  }
78 
79  if(avctx->pix_fmt != AV_PIX_FMT_BGR24){
80  av_log(avctx, AV_LOG_ERROR, "Format not supported!\n");
81  return -1;
82  }
83 
84  zret = deflateReset(&c->zstream);
85  if (zret != Z_OK) {
86  av_log(avctx, AV_LOG_ERROR, "Deflate reset error: %d\n", zret);
87  return -1;
88  }
89  c->zstream.next_out = pkt->data;
90  c->zstream.avail_out = pkt->size;
91 
92  for(i = avctx->height - 1; i >= 0; i--) {
93  c->zstream.next_in = p->data[0]+p->linesize[0]*i;
94  c->zstream.avail_in = avctx->width*3;
95  zret = deflate(&c->zstream, Z_NO_FLUSH);
96  if (zret != Z_OK) {
97  av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret);
98  return -1;
99  }
100  }
101  zret = deflate(&c->zstream, Z_FINISH);
102  if (zret != Z_STREAM_END) {
103  av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret);
104  return -1;
105  }
106 
107  pkt->size = c->zstream.total_out;
108  pkt->flags |= AV_PKT_FLAG_KEY;
109  *got_packet = 1;
110 
111  return 0;
112 }
113 
115 {
116  LclEncContext *c = avctx->priv_data;
117  int zret; // Zlib return code
118 
119  c->avctx= avctx;
120 
121  assert(avctx->width && avctx->height);
122 
123  avctx->extradata= av_mallocz(8);
124  if (!avctx->extradata)
125  return AVERROR(ENOMEM);
126 
127 #if FF_API_CODED_FRAME
130  avctx->coded_frame->key_frame = 1;
132 #endif
133 
134  // Will be user settable someday
135  c->compression = 6;
136  c->flags = 0;
137  c->imgtype = IMGTYPE_RGB24;
138  avctx->bits_per_coded_sample= 24;
139 
140  avctx->extradata[0]= 4;
141  avctx->extradata[1]= 0;
142  avctx->extradata[2]= 0;
143  avctx->extradata[3]= 0;
144  avctx->extradata[4]= c->imgtype;
145  avctx->extradata[5]= c->compression;
146  avctx->extradata[6]= c->flags;
147  avctx->extradata[7]= CODEC_ZLIB;
148  c->avctx->extradata_size= 8;
149 
150  c->zstream.zalloc = Z_NULL;
151  c->zstream.zfree = Z_NULL;
152  c->zstream.opaque = Z_NULL;
153  zret = deflateInit(&c->zstream, c->compression);
154  if (zret != Z_OK) {
155  av_log(avctx, AV_LOG_ERROR, "Deflate init error: %d\n", zret);
156  return AVERROR_UNKNOWN;
157  }
158 
159  return 0;
160 }
161 
163 {
164  LclEncContext *c = avctx->priv_data;
165 
166  av_freep(&avctx->extradata);
167  deflateEnd(&c->zstream);
168 
169  return 0;
170 }
171 
173  .name = "zlib",
174  .long_name = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) ZLIB"),
175  .type = AVMEDIA_TYPE_VIDEO,
176  .id = AV_CODEC_ID_ZLIB,
177  .priv_data_size = sizeof(LclEncContext),
178  .init = encode_init,
179  .encode2 = encode_frame,
180  .close = encode_end,
182  .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE |
184 };
#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
This structure describes decoded (raw) audio or video data.
Definition: frame.h:140
memory handling functions
static av_cold int encode_end(AVCodecContext *avctx)
Definition: lclenc.c:162
int size
Definition: avcodec.h:1347
av_log(ac->avr, AV_LOG_TRACE, "%d samples - audio_convert: %s to %s (%s)\, len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt), use_generic ? ac->func_descr_generic :ac->func_descr)
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1621
static av_cold int encode_init(AVCodecContext *avctx)
Definition: lclenc.c:114
int compression
Definition: lclenc.c:58
AVCodec.
Definition: avcodec.h:3120
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:202
#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:56
#define av_cold
Definition: attributes.h:66
AVCodec ff_zlib_encoder
Definition: lclenc.c:172
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1523
uint8_t * data
Definition: avcodec.h:1346
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:2769
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1378
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:84
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:124
int flags
Definition: lclenc.c:60
#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:148
#define IMGTYPE_RGB24
Definition: lcl.h:30
const char * name
Name of the codec implementation.
Definition: avcodec.h:3127
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1352
AVCodecContext * avctx
Definition: lclenc.c:53
common internal API header
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:201
int width
picture width / height.
Definition: avcodec.h:1580
packed RGB 8:8:8, 24bpp, BGRBGR...
Definition: pixfmt.h:62
z_stream zstream
Definition: lclenc.c:61
Libavcodec external API header.
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:158
main external API structure.
Definition: avcodec.h:1409
int extradata_size
Definition: avcodec.h:1524
static int encode_frame(AVCodecContext *avctx, AVPacket *pkt, const AVFrame *pict, int *got_packet)
Definition: lclenc.c:64
static enum AVPixelFormat pix_fmts[]
Definition: libkvazaar.c:257
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:146
#define FF_DISABLE_DEPRECATION_WARNINGS
Definition: internal.h:77
common internal api header.
attribute_deprecated AVFrame * coded_frame
the picture in the bitstream
Definition: avcodec.h:2797
#define AVERROR_UNKNOWN
Unknown error, typically from an external library.
Definition: error.h:61
static av_cold int init(AVCodecParserContext *s)
Definition: h264_parser.c:582
void * priv_data
Definition: avcodec.h:1451
#define FF_ENABLE_DEPRECATION_WARNINGS
Definition: internal.h:78
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:196
AVPixelFormat
Pixel format.
Definition: pixfmt.h:57
This structure stores compressed data.
Definition: avcodec.h:1323
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:211