FFmpeg
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 "encode.h"
25 #include "internal.h"
26 
28 {
29  if (avctx->width & 7) {
30  av_log(avctx, AV_LOG_ERROR, "y41p requires width to be divisible by 8.\n");
31  return AVERROR_INVALIDDATA;
32  }
33 
34  avctx->bits_per_coded_sample = 12;
35  avctx->bit_rate = ff_guess_coded_bitrate(avctx);
36 
37  return 0;
38 }
39 
41  const AVFrame *pic, int *got_packet)
42 {
43  uint8_t *dst;
44  uint8_t *y, *u, *v;
45  int i, j, ret;
46 
47  ret = ff_get_encode_buffer(avctx, pkt, avctx->width * avctx->height * 1.5, 0);
48  if (ret < 0)
49  return ret;
50 
51  dst = pkt->data;
52 
53  for (i = avctx->height - 1; i >= 0; i--) {
54  y = &pic->data[0][i * pic->linesize[0]];
55  u = &pic->data[1][i * pic->linesize[1]];
56  v = &pic->data[2][i * pic->linesize[2]];
57  for (j = 0; j < avctx->width; j += 8) {
58  *(dst++) = *(u++);
59  *(dst++) = *(y++);
60  *(dst++) = *(v++);
61  *(dst++) = *(y++);
62 
63  *(dst++) = *(u++);
64  *(dst++) = *(y++);
65  *(dst++) = *(v++);
66  *(dst++) = *(y++);
67 
68  *(dst++) = *(y++);
69  *(dst++) = *(y++);
70  *(dst++) = *(y++);
71  *(dst++) = *(y++);
72  }
73  }
74 
76  *got_packet = 1;
77  return 0;
78 }
79 
81  .name = "y41p",
82  .long_name = NULL_IF_CONFIG_SMALL("Uncompressed YUV 4:1:1 12-bit"),
83  .type = AVMEDIA_TYPE_VIDEO,
84  .id = AV_CODEC_ID_Y41P,
85  .capabilities = AV_CODEC_CAP_DR1,
86  .init = y41p_encode_init,
87  .encode2 = y41p_encode_frame,
88  .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV411P,
90  .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
91 };
ff_guess_coded_bitrate
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:1107
AVCodec
AVCodec.
Definition: codec.h:197
FF_CODEC_CAP_INIT_THREADSAFE
#define FF_CODEC_CAP_INIT_THREADSAFE
The codec does not modify any global variables in the init function, allowing to call the init functi...
Definition: internal.h:42
AVPixelFormat
AVPixelFormat
Pixel format.
Definition: pixfmt.h:64
u
#define u(width, name, range_min, range_max)
Definition: cbs_h2645.c:264
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:303
internal.h
AVPacket::data
uint8_t * data
Definition: packet.h:373
encode.h
AV_PKT_FLAG_KEY
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: packet.h:425
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:317
pkt
AVPacket * pkt
Definition: movenc.c:59
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
av_cold
#define av_cold
Definition: attributes.h:90
y41p_encode_frame
static int y41p_encode_frame(AVCodecContext *avctx, AVPacket *pkt, const AVFrame *pic, int *got_packet)
Definition: y41penc.c:40
AV_CODEC_ID_Y41P
@ AV_CODEC_ID_Y41P
Definition: codec_id.h:250
AVCodecContext::bit_rate
int64_t bit_rate
the average bitrate
Definition: avcodec.h:429
AV_CODEC_CAP_DR1
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:52
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
y41p_encode_init
static av_cold int y41p_encode_init(AVCodecContext *avctx)
Definition: y41penc.c:27
AVPacket::flags
int flags
A combination of AV_PKT_FLAG values.
Definition: packet.h:379
ff_y41p_encoder
const AVCodec ff_y41p_encoder
Definition: y41penc.c:80
AVCodecContext::bits_per_coded_sample
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:1414
i
int i
Definition: input.c:406
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:204
AVCodecContext::height
int height
Definition: avcodec.h:552
avcodec.h
ret
ret
Definition: filter_design.txt:187
AVCodecContext
main external API structure.
Definition: avcodec.h:379
ff_get_encode_buffer
int ff_get_encode_buffer(AVCodecContext *avctx, AVPacket *avpkt, int64_t size, int flags)
Get a buffer for a packet.
Definition: encode.c:78
AV_PIX_FMT_NONE
@ AV_PIX_FMT_NONE
Definition: pixfmt.h:65
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
AVPacket
This structure stores compressed data.
Definition: packet.h:350
AV_PIX_FMT_YUV411P
@ AV_PIX_FMT_YUV411P
planar YUV 4:1:1, 12bpp, (1 Cr & Cb sample per 4x1 Y samples)
Definition: pixfmt.h:73
AVCodecContext::width
int width
picture width / height.
Definition: avcodec.h:552
AVFrame::linesize
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:334
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61