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 
34 {
35  avctx->coded_frame = av_frame_alloc();
36  if (!avctx->coded_frame)
37  return AVERROR(ENOMEM);
38 
39  return 0;
40 }
41 
43 {
44  av_frame_free(&avctx->coded_frame);
45  return 0;
46 }
47 
48 static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
49  const AVFrame *p, int *got_packet)
50 {
51  PutBitContext pb;
52  int x, y, ret;
53 
54  if ((ret = ff_alloc_packet(pkt, 32*avctx->height*avctx->width/4)) < 0) {
55  av_log(avctx, AV_LOG_ERROR, "Error getting output packet.\n");
56  return ret;
57  }
58 
60  avctx->coded_frame->key_frame = 1;
61 
62  init_put_bits(&pb, pkt->data, pkt->size);
63 
64  for (y = 0; y < avctx->height; y++) {
65  uint8_t *luma = &p->data[0][y * p->linesize[0]];
66  uint8_t *cb = &p->data[1][y * p->linesize[1]];
67  uint8_t *cr = &p->data[2][y * p->linesize[2]];
68  for (x = 0; x < avctx->width; x += 4) {
69  put_bits(&pb, 5, luma[3] >> 3);
70  put_bits(&pb, 5, luma[2] >> 3);
71  put_bits(&pb, 5, luma[1] >> 3);
72  put_bits(&pb, 5, luma[0] >> 3);
73  luma += 4;
74  put_bits(&pb, 6, *(cb++) >> 2);
75  put_bits(&pb, 6, *(cr++) >> 2);
76  }
77  }
78 
79  flush_put_bits(&pb);
80 
81  pkt->size = put_bits_count(&pb) / 8;
82  pkt->flags |= AV_PKT_FLAG_KEY;
83  *got_packet = 1;
84  return 0;
85 }
86 
88  .name = "cljr",
89  .long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"),
90  .type = AVMEDIA_TYPE_VIDEO,
91  .id = AV_CODEC_ID_CLJR,
92  .init = encode_init,
93  .encode2 = encode_frame,
94  .close = encode_close,
95  .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV411P,
97 };
AVCodec ff_cljr_encoder
Definition: cljrenc.c:87
This structure describes decoded (raw) audio or video data.
Definition: frame.h:135
AVFrame * coded_frame
the picture in the bitstream
Definition: avcodec.h:2548
int size
Definition: avcodec.h:974
AVCodec.
Definition: avcodec.h:2812
uint8_t
#define av_cold
Definition: attributes.h:66
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:57
uint8_t * data
Definition: avcodec.h:973
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1019
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:123
static av_cold int encode_init(AVCodecContext *avctx)
Definition: cljrenc.c:33
#define AVERROR(e)
Definition: error.h:43
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:69
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:145
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:169
const char * name
Name of the codec implementation.
Definition: avcodec.h:2819
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:979
static int put_bits_count(PutBitContext *s)
Definition: put_bits.h:67
static av_cold int encode_close(AVCodecContext *avctx)
Definition: cljrenc.c:42
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:196
int width
picture width / height.
Definition: avcodec.h:1229
int ff_alloc_packet(AVPacket *avpkt, int size)
Check AVPacket size and/or allocate data.
Definition: utils.c:1266
Libavcodec external API header.
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:153
main external API structure.
Definition: avcodec.h:1050
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:141
static int encode_frame(AVCodecContext *avctx, AVPacket *pkt, const AVFrame *p, int *got_packet)
Definition: cljrenc.c:48
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
planar YUV 4:1:1, 12bpp, (1 Cr & Cb sample per 4x1 Y samples)
Definition: pixfmt.h:72
static void init_put_bits(PutBitContext *s, uint8_t *buffer, int buffer_size)
Initialize the PutBitContext s.
Definition: put_bits.h:48
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:191
AVPixelFormat
Pixel format.
Definition: pixfmt.h:63
This structure stores compressed data.
Definition: avcodec.h:950
bitstream writer API