FFmpeg
v308dec.c
Go to the documentation of this file.
1 /*
2  * v308 decoder
3  * Copyright (c) 2011 Carl Eugen Hoyos
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg 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  * FFmpeg 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 FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include "avcodec.h"
23 #include "internal.h"
24 
26 {
27  avctx->pix_fmt = AV_PIX_FMT_YUV444P;
28 
29  if (avctx->width & 1)
30  av_log(avctx, AV_LOG_WARNING, "v308 requires width to be even.\n");
31 
32  return 0;
33 }
34 
35 static int v308_decode_frame(AVCodecContext *avctx, void *data,
36  int *got_frame, AVPacket *avpkt)
37 {
38  AVFrame *pic = data;
39  const uint8_t *src = avpkt->data;
40  uint8_t *y, *u, *v;
41  int i, j, ret;
42 
43  if (avpkt->size < 3 * avctx->height * avctx->width) {
44  av_log(avctx, AV_LOG_ERROR, "Insufficient input data.\n");
45  return AVERROR(EINVAL);
46  }
47 
48  if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
49  return ret;
50 
51  pic->key_frame = 1;
53 
54  y = pic->data[0];
55  u = pic->data[1];
56  v = pic->data[2];
57 
58  for (i = 0; i < avctx->height; i++) {
59  for (j = 0; j < avctx->width; j++) {
60  v[j] = *src++;
61  y[j] = *src++;
62  u[j] = *src++;
63  }
64 
65  y += pic->linesize[0];
66  u += pic->linesize[1];
67  v += pic->linesize[2];
68  }
69 
70  *got_frame = 1;
71 
72  return avpkt->size;
73 }
74 
76  .name = "v308",
77  .long_name = NULL_IF_CONFIG_SMALL("Uncompressed packed 4:4:4"),
78  .type = AVMEDIA_TYPE_VIDEO,
79  .id = AV_CODEC_ID_V308,
80  .init = v308_decode_init,
81  .decode = v308_decode_frame,
82  .capabilities = AV_CODEC_CAP_DR1,
83  .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
84 };
AVCodec
AVCodec.
Definition: codec.h:197
AV_LOG_WARNING
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:187
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:41
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
AV_CODEC_ID_V308
@ AV_CODEC_ID_V308
Definition: codec_id.h:255
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:365
data
const char data[16]
Definition: mxf.c:142
v308_decode_init
static av_cold int v308_decode_init(AVCodecContext *avctx)
Definition: v308dec.c:25
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:317
AVFrame::key_frame
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:381
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:181
av_cold
#define av_cold
Definition: attributes.h:90
AV_PICTURE_TYPE_I
@ AV_PICTURE_TYPE_I
Intra.
Definition: avutil.h:274
src
#define src
Definition: vp8dsp.c:255
AVFrame::pict_type
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:386
ff_get_buffer
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1638
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
AVPacket::size
int size
Definition: packet.h:366
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
i
int i
Definition: input.c:407
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:204
AVCodecContext::height
int height
Definition: avcodec.h:674
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:711
avcodec.h
ret
ret
Definition: filter_design.txt:187
ff_v308_decoder
const AVCodec ff_v308_decoder
Definition: v308dec.c:75
v308_decode_frame
static int v308_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: v308dec.c:35
AVCodecContext
main external API structure.
Definition: avcodec.h:501
AV_PIX_FMT_YUV444P
@ AV_PIX_FMT_YUV444P
planar YUV 4:4:4, 24bpp, (1 Cr & Cb sample per 1x1 Y samples)
Definition: pixfmt.h:71
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
AVPacket
This structure stores compressed data.
Definition: packet.h:342
AVCodecContext::width
int width
picture width / height.
Definition: avcodec.h:674
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