FFmpeg
v408dec.c
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1 /*
2  * v408 decoder
3  * Copyright (c) 2012 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 {
28 
29  return 0;
30 }
31 
32 static int v408_decode_frame(AVCodecContext *avctx, void *data,
33  int *got_frame, AVPacket *avpkt)
34 {
35  AVFrame *pic = data;
36  const uint8_t *src = avpkt->data;
37  uint8_t *y, *u, *v, *a;
38  int i, j, ret;
39 
40  if (avpkt->size < 4 * avctx->height * avctx->width) {
41  av_log(avctx, AV_LOG_ERROR, "Insufficient input data.\n");
42  return AVERROR(EINVAL);
43  }
44 
45  if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
46  return ret;
47 
48  pic->key_frame = 1;
50 
51  y = pic->data[0];
52  u = pic->data[1];
53  v = pic->data[2];
54  a = pic->data[3];
55 
56  for (i = 0; i < avctx->height; i++) {
57  for (j = 0; j < avctx->width; j++) {
58  if (avctx->codec_id==AV_CODEC_ID_AYUV) {
59  v[j] = *src++;
60  u[j] = *src++;
61  y[j] = *src++;
62  a[j] = *src++;
63  } else {
64  u[j] = *src++;
65  y[j] = *src++;
66  v[j] = *src++;
67  a[j] = *src++;
68  }
69  }
70 
71  y += pic->linesize[0];
72  u += pic->linesize[1];
73  v += pic->linesize[2];
74  a += pic->linesize[3];
75  }
76 
77  *got_frame = 1;
78 
79  return avpkt->size;
80 }
81 
82 #if CONFIG_AYUV_DECODER
84  .name = "ayuv",
85  .long_name = NULL_IF_CONFIG_SMALL("Uncompressed packed MS 4:4:4:4"),
86  .type = AVMEDIA_TYPE_VIDEO,
87  .id = AV_CODEC_ID_AYUV,
88  .init = v408_decode_init,
89  .decode = v408_decode_frame,
90  .capabilities = AV_CODEC_CAP_DR1,
91  .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
92 };
93 #endif
94 #if CONFIG_V408_DECODER
96  .name = "v408",
97  .long_name = NULL_IF_CONFIG_SMALL("Uncompressed packed QT 4:4:4:4"),
98  .type = AVMEDIA_TYPE_VIDEO,
99  .id = AV_CODEC_ID_V408,
100  .init = v408_decode_init,
101  .decode = v408_decode_frame,
102  .capabilities = AV_CODEC_CAP_DR1,
103  .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
104 };
105 #endif
This structure describes decoded (raw) audio or video data.
Definition: frame.h:268
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:100
int size
Definition: avcodec.h:1478
The reader does not expect b to be semantically here and if the code is changed by maybe adding a a division or other the signedness will almost certainly be mistaken To avoid this confusion a new type was SUINT is the C unsigned type but it holds a signed int to use the same example SUINT a
Definition: undefined.txt:36
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1775
#define src
Definition: vp8dsp.c:254
AVCodec.
Definition: avcodec.h:3477
#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:40
uint8_t
#define av_cold
Definition: attributes.h:82
#define u(width, name, range_min, range_max)
Definition: cbs_h2645.c:253
uint8_t * data
Definition: avcodec.h:1477
#define av_log(a,...)
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:260
#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:186
const char * name
Name of the codec implementation.
Definition: avcodec.h:3484
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:351
int width
picture width / height.
Definition: avcodec.h:1738
AVCodec ff_ayuv_decoder
Libavcodec external API header.
enum AVCodecID codec_id
Definition: avcodec.h:1575
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:299
planar YUV 4:4:4 32bpp, (1 Cr & Cb sample per 1x1 Y & A samples)
Definition: pixfmt.h:177
main external API structure.
Definition: avcodec.h:1565
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1964
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:282
common internal api header.
AVCodec ff_v408_decoder
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:346
static av_cold int v408_decode_init(AVCodecContext *avctx)
Definition: v408dec.c:25
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
This structure stores compressed data.
Definition: avcodec.h:1454
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:981
static int v408_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: v408dec.c:32