Libav
cljrenc.c
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1 /*
2  * Cirrus Logic AccuPak (CLJR) encoder
3  * Copyright (c) 2003 Alex Beregszaszi
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 
27 #include "libavutil/common.h"
28 
29 #include "avcodec.h"
30 #include "internal.h"
31 #include "put_bits.h"
32 
33 static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
34  const AVFrame *p, int *got_packet)
35 {
36  PutBitContext pb;
37  int x, y, ret;
38 
39  if ((ret = ff_alloc_packet(pkt, 32*avctx->height*avctx->width/4)) < 0) {
40  av_log(avctx, AV_LOG_ERROR, "Error getting output packet.\n");
41  return ret;
42  }
43 
44 #if FF_API_CODED_FRAME
47  avctx->coded_frame->key_frame = 1;
49 #endif
50 
51  init_put_bits(&pb, pkt->data, pkt->size);
52 
53  for (y = 0; y < avctx->height; y++) {
54  uint8_t *luma = &p->data[0][y * p->linesize[0]];
55  uint8_t *cb = &p->data[1][y * p->linesize[1]];
56  uint8_t *cr = &p->data[2][y * p->linesize[2]];
57  for (x = 0; x < avctx->width; x += 4) {
58  put_bits(&pb, 5, luma[3] >> 3);
59  put_bits(&pb, 5, luma[2] >> 3);
60  put_bits(&pb, 5, luma[1] >> 3);
61  put_bits(&pb, 5, luma[0] >> 3);
62  luma += 4;
63  put_bits(&pb, 6, *(cb++) >> 2);
64  put_bits(&pb, 6, *(cr++) >> 2);
65  }
66  }
67 
68  flush_put_bits(&pb);
69 
70  pkt->size = put_bits_count(&pb) / 8;
71  pkt->flags |= AV_PKT_FLAG_KEY;
72  *got_packet = 1;
73  return 0;
74 }
75 
77  .name = "cljr",
78  .long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"),
79  .type = AVMEDIA_TYPE_VIDEO,
80  .id = AV_CODEC_ID_CLJR,
81  .encode2 = encode_frame,
82  .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV411P,
84 };
AVCodec ff_cljr_encoder
Definition: cljrenc.c:76
This structure describes decoded (raw) audio or video data.
Definition: frame.h:140
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)
AVCodec.
Definition: avcodec.h:3120
uint8_t
uint8_t * data
Definition: avcodec.h:1346
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1378
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:124
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:148
const char * name
Name of the codec implementation.
Definition: avcodec.h:3127
static void put_bits(PutBitContext *s, int n, unsigned int value)
Write up to 31 bits into a bitstream.
Definition: put_bits.h:134
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1352
static int put_bits_count(PutBitContext *s)
Definition: put_bits.h:67
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:201
int width
picture width / height.
Definition: avcodec.h:1580
int ff_alloc_packet(AVPacket *avpkt, int size)
Check AVPacket size and/or allocate data.
Definition: utils.c:1211
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
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:146
static int encode_frame(AVCodecContext *avctx, AVPacket *pkt, const AVFrame *p, int *got_packet)
Definition: cljrenc.c:33
#define FF_DISABLE_DEPRECATION_WARNINGS
Definition: internal.h:77
common internal api header.
static void flush_put_bits(PutBitContext *s)
Pad the end of the output stream with zeros.
Definition: put_bits.h:83
common internal and external API header
attribute_deprecated AVFrame * coded_frame
the picture in the bitstream
Definition: avcodec.h:2797
planar YUV 4:1:1, 12bpp, (1 Cr & Cb sample per 4x1 Y samples)
Definition: pixfmt.h:66
static void init_put_bits(PutBitContext *s, uint8_t *buffer, int buffer_size)
Initialize the PutBitContext s.
Definition: put_bits.h:48
#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
bitstream writer API