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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->coded_frame = av_frame_alloc();
34  avctx->bits_per_coded_sample = 12;
35 
36  if (!avctx->coded_frame) {
37  av_log(avctx, AV_LOG_ERROR, "Could not allocate frame.\n");
38  return AVERROR(ENOMEM);
39  }
40 
41  return 0;
42 }
43 
45  const AVFrame *pic, int *got_packet)
46 {
47  uint8_t *dst;
48  uint8_t *y, *u, *v;
49  int i, j, ret;
50 
51  if ((ret = ff_alloc_packet2(avctx, pkt, avctx->width * avctx->height * 1.5)) < 0)
52  return ret;
53 
54  avctx->coded_frame->key_frame = 1;
56  dst = pkt->data;
57 
58  for (i = avctx->height - 1; i >= 0; i--) {
59  y = &pic->data[0][i * pic->linesize[0]];
60  u = &pic->data[1][i * pic->linesize[1]];
61  v = &pic->data[2][i * pic->linesize[2]];
62  for (j = 0; j < avctx->width; j += 8) {
63  *(dst++) = *(u++);
64  *(dst++) = *(y++);
65  *(dst++) = *(v++);
66  *(dst++) = *(y++);
67 
68  *(dst++) = *(u++);
69  *(dst++) = *(y++);
70  *(dst++) = *(v++);
71  *(dst++) = *(y++);
72 
73  *(dst++) = *(y++);
74  *(dst++) = *(y++);
75  *(dst++) = *(y++);
76  *(dst++) = *(y++);
77  }
78  }
79 
80  pkt->flags |= AV_PKT_FLAG_KEY;
81  *got_packet = 1;
82  return 0;
83 }
84 
86 {
87  av_frame_free(&avctx->coded_frame);
88 
89  return 0;
90 }
91 
93  .name = "y41p",
94  .long_name = NULL_IF_CONFIG_SMALL("Uncompressed YUV 4:1:1 12-bit"),
95  .type = AVMEDIA_TYPE_VIDEO,
96  .id = AV_CODEC_ID_Y41P,
97  .init = y41p_encode_init,
98  .encode2 = y41p_encode_frame,
99  .close = y41p_encode_close,
100  .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV411P,
101  AV_PIX_FMT_NONE },
102 };
int ff_alloc_packet2(AVCodecContext *avctx, AVPacket *avpkt, int64_t size)
Check AVPacket size and/or allocate data.
Definition: utils.c:1736
static av_cold int y41p_encode_close(AVCodecContext *avctx)
Definition: y41penc.c:85
float v
#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:171
AVFrame * coded_frame
the picture in the bitstream
Definition: avcodec.h:2745
static AVPacket pkt
AVCodec.
Definition: avcodec.h:3181
uint8_t
#define av_cold
Definition: attributes.h:74
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:135
static int y41p_encode_frame(AVCodecContext *avctx, AVPacket *pkt, const AVFrame *pic, int *got_packet)
Definition: y41penc.c:44
uint8_t * data
Definition: avcodec.h:1162
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:2720
#define av_log(a,...)
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1208
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
#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:148
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:175
const char * name
Name of the codec implementation.
Definition: avcodec.h:3188
Libavcodec external API header.
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1168
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:242
float y
ret
Definition: avfilter.c:974
int width
picture width / height.
Definition: avcodec.h:1414
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:1241
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:182
common internal api header.
planar YUV 4:1:1, 12bpp, (1 Cr & Cb sample per 4x1 Y samples)
Definition: pixfmt.h:70
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:237
AVPixelFormat
Pixel format.
Definition: pixfmt.h:61
This structure stores compressed data.
Definition: avcodec.h:1139
AVCodec ff_y41p_encoder
Definition: y41penc.c:92