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yuv4enc.c
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1 /*
2  * libquicktime yuv4 encoder
3  *
4  * Copyright (c) 2011 Carl Eugen Hoyos
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #include "avcodec.h"
24 #include "internal.h"
25 
27 {
28  return 0;
29 }
30 
32  const AVFrame *pic, int *got_packet)
33 {
34  uint8_t *dst;
35  uint8_t *y, *u, *v;
36  int i, j, ret;
37 
38  if ((ret = ff_alloc_packet2(avctx, pkt, 6 * (avctx->width + 1 >> 1) * (avctx->height + 1 >> 1), 0)) < 0)
39  return ret;
40  dst = pkt->data;
41 
42  y = pic->data[0];
43  u = pic->data[1];
44  v = pic->data[2];
45 
46  for (i = 0; i < avctx->height + 1 >> 1; i++) {
47  for (j = 0; j < avctx->width + 1 >> 1; j++) {
48  *dst++ = u[j] ^ 0x80;
49  *dst++ = v[j] ^ 0x80;
50  *dst++ = y[ 2 * j ];
51  *dst++ = y[ 2 * j + 1];
52  *dst++ = y[pic->linesize[0] + 2 * j ];
53  *dst++ = y[pic->linesize[0] + 2 * j + 1];
54  }
55  y += 2 * pic->linesize[0];
56  u += pic->linesize[1];
57  v += pic->linesize[2];
58  }
59 
60  pkt->flags |= AV_PKT_FLAG_KEY;
61  *got_packet = 1;
62  return 0;
63 }
64 
66 {
67  return 0;
68 }
69 
71  .name = "yuv4",
72  .long_name = NULL_IF_CONFIG_SMALL("Uncompressed packed 4:2:0"),
73  .type = AVMEDIA_TYPE_VIDEO,
74  .id = AV_CODEC_ID_YUV4,
75  .init = yuv4_encode_init,
76  .encode2 = yuv4_encode_frame,
77  .close = yuv4_encode_close,
78  .pix_fmts = (const enum AVPixelFormat[]){ AV_PIX_FMT_YUV420P, AV_PIX_FMT_NONE },
79  .capabilities = AV_CODEC_CAP_INTRA_ONLY,
80 };
float v
AVCodec ff_yuv4_encoder
Definition: yuv4enc.c:70
This structure describes decoded (raw) audio or video data.
Definition: frame.h:171
static AVPacket pkt
AVCodec.
Definition: avcodec.h:3471
#define AV_CODEC_CAP_INTRA_ONLY
Codec is intra only.
Definition: avcodec.h:939
uint8_t
#define av_cold
Definition: attributes.h:74
static av_cold int yuv4_encode_init(AVCodecContext *avctx)
Definition: yuv4enc.c:26
uint8_t * data
Definition: avcodec.h:1422
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1468
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:175
static int yuv4_encode_frame(AVCodecContext *avctx, AVPacket *pkt, const AVFrame *pic, int *got_packet)
Definition: yuv4enc.c:31
const char * name
Name of the codec implementation.
Definition: avcodec.h:3478
Libavcodec external API header.
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1428
float y
int width
picture width / height.
Definition: avcodec.h:1680
float u
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:199
main external API structure.
Definition: avcodec.h:1501
int ff_alloc_packet2(AVCodecContext *avctx, AVPacket *avpkt, int64_t size, int64_t min_size)
Check AVPacket size and/or allocate data.
Definition: utils.c:1782
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:182
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:63
common internal api header.
static av_cold int yuv4_encode_close(AVCodecContext *avctx)
Definition: yuv4enc.c:65
AVPixelFormat
Pixel format.
Definition: pixfmt.h:61
This structure stores compressed data.
Definition: avcodec.h:1399