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y41penc.c
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1 /*
2  * y41p encoder
3  *
4  * Copyright (c) 2012 Paul B Mahol
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  if (avctx->width & 7) {
29  av_log(avctx, AV_LOG_ERROR, "y41p requires width to be divisible by 8.\n");
30  return AVERROR_INVALIDDATA;
31  }
32 
33  avctx->bits_per_coded_sample = 12;
34  avctx->bit_rate = ff_guess_coded_bitrate(avctx);
35 
36  return 0;
37 }
38 
40  const AVFrame *pic, int *got_packet)
41 {
42  uint8_t *dst;
43  uint8_t *y, *u, *v;
44  int i, j, ret;
45 
46  if ((ret = ff_alloc_packet2(avctx, pkt, avctx->width * avctx->height * 1.5, 0)) < 0)
47  return ret;
48 
49  dst = pkt->data;
50 
51  for (i = avctx->height - 1; i >= 0; i--) {
52  y = &pic->data[0][i * pic->linesize[0]];
53  u = &pic->data[1][i * pic->linesize[1]];
54  v = &pic->data[2][i * pic->linesize[2]];
55  for (j = 0; j < avctx->width; j += 8) {
56  *(dst++) = *(u++);
57  *(dst++) = *(y++);
58  *(dst++) = *(v++);
59  *(dst++) = *(y++);
60 
61  *(dst++) = *(u++);
62  *(dst++) = *(y++);
63  *(dst++) = *(v++);
64  *(dst++) = *(y++);
65 
66  *(dst++) = *(y++);
67  *(dst++) = *(y++);
68  *(dst++) = *(y++);
69  *(dst++) = *(y++);
70  }
71  }
72 
73  pkt->flags |= AV_PKT_FLAG_KEY;
74  *got_packet = 1;
75  return 0;
76 }
77 
79 {
80  return 0;
81 }
82 
84  .name = "y41p",
85  .long_name = NULL_IF_CONFIG_SMALL("Uncompressed YUV 4:1:1 12-bit"),
86  .type = AVMEDIA_TYPE_VIDEO,
87  .id = AV_CODEC_ID_Y41P,
88  .init = y41p_encode_init,
89  .encode2 = y41p_encode_frame,
90  .close = y41p_encode_close,
91  .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV411P,
93  .capabilities = AV_CODEC_CAP_INTRA_ONLY,
94 };
static av_cold int y41p_encode_close(AVCodecContext *avctx)
Definition: y41penc.c:78
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
This structure describes decoded (raw) audio or video data.
Definition: frame.h:201
int64_t bit_rate
the average bitrate
Definition: avcodec.h:1826
static AVPacket pkt
AVCodec.
Definition: avcodec.h:3739
#define AV_CODEC_CAP_INTRA_ONLY
Codec is intra only.
Definition: avcodec.h:1095
int ff_alloc_packet2(AVCodecContext *avctx, AVPacket *avpkt, int64_t size, int64_t min_size)
Check AVPacket size and/or allocate data.
Definition: encode.c:32
uint8_t
#define av_cold
Definition: attributes.h:82
#define u(width, name, range_min, range_max)
Definition: cbs_h2645.c:343
static int y41p_encode_frame(AVCodecContext *avctx, AVPacket *pkt, const AVFrame *pic, int *got_packet)
Definition: y41penc.c:39
uint8_t * data
Definition: avcodec.h:1679
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:3157
#define av_log(a,...)
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1711
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:179
const char * name
Name of the codec implementation.
Definition: avcodec.h:3746
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1685
int64_t ff_guess_coded_bitrate(AVCodecContext *avctx)
Get an estimated video bitrate based on frame size, frame rate and coded bits per pixel...
Definition: utils.c:2454
int width
picture width / height.
Definition: avcodec.h:1948
Libavcodec external API header.
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:232
main external API structure.
Definition: avcodec.h:1761
static av_cold int y41p_encode_init(AVCodecContext *avctx)
Definition: y41penc.c:26
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:215
common internal api header.
planar YUV 4:1:1, 12bpp, (1 Cr & Cb sample per 4x1 Y samples)
Definition: pixfmt.h:69
AVPixelFormat
Pixel format.
Definition: pixfmt.h:60
This structure stores compressed data.
Definition: avcodec.h:1656
AVCodec ff_y41p_encoder
Definition: y41penc.c:83