v410dec.c
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1 /*
2  * v410 decoder
3  *
4  * Copyright (c) 2011 Derek Buitenhuis
5  *
6  * This file is part of Libav.
7  *
8  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #include "libavutil/common.h"
24 #include "libavutil/intreadwrite.h"
25 #include "avcodec.h"
26 #include "internal.h"
27 
29 {
31  avctx->bits_per_raw_sample = 10;
32 
33  if (avctx->width & 1) {
34  if (avctx->err_recognition & AV_EF_EXPLODE) {
35  av_log(avctx, AV_LOG_ERROR, "v410 requires width to be even.\n");
36  return AVERROR_INVALIDDATA;
37  } else {
38  av_log(avctx, AV_LOG_WARNING, "v410 requires width to be even, continuing anyway.\n");
39  }
40  }
41 
43 
44  if (!avctx->coded_frame) {
45  av_log(avctx, AV_LOG_ERROR, "Could not allocate frame.\n");
46  return AVERROR(ENOMEM);
47  }
48 
49  return 0;
50 }
51 
52 static int v410_decode_frame(AVCodecContext *avctx, void *data,
53  int *got_frame, AVPacket *avpkt)
54 {
55  AVFrame *pic = avctx->coded_frame;
56  uint8_t *src = avpkt->data;
57  uint16_t *y, *u, *v;
58  uint32_t val;
59  int i, j;
60 
61  if (pic->data[0])
62  avctx->release_buffer(avctx, pic);
63 
64  if (avpkt->size < 4 * avctx->height * avctx->width) {
65  av_log(avctx, AV_LOG_ERROR, "Insufficient input data.\n");
66  return AVERROR(EINVAL);
67  }
68 
69  pic->reference = 0;
70 
71  if (ff_get_buffer(avctx, pic) < 0) {
72  av_log(avctx, AV_LOG_ERROR, "Could not allocate buffer.\n");
73  return AVERROR(ENOMEM);
74  }
75 
76  pic->key_frame = 1;
78 
79  y = (uint16_t *)pic->data[0];
80  u = (uint16_t *)pic->data[1];
81  v = (uint16_t *)pic->data[2];
82 
83  for (i = 0; i < avctx->height; i++) {
84  for (j = 0; j < avctx->width; j++) {
85  val = AV_RL32(src);
86 
87  u[j] = (val >> 2) & 0x3FF;
88  y[j] = (val >> 12) & 0x3FF;
89  v[j] = (val >> 22);
90 
91  src += 4;
92  }
93 
94  y += pic->linesize[0] >> 1;
95  u += pic->linesize[1] >> 1;
96  v += pic->linesize[2] >> 1;
97  }
98 
99  *got_frame = 1;
100  *(AVFrame *)data = *pic;
101 
102  return avpkt->size;
103 }
104 
106 {
107  if (avctx->coded_frame->data[0])
108  avctx->release_buffer(avctx, avctx->coded_frame);
109 
110  av_freep(&avctx->coded_frame);
111 
112  return 0;
113 }
114 
116  .name = "v410",
117  .type = AVMEDIA_TYPE_VIDEO,
118  .id = AV_CODEC_ID_V410,
119  .init = v410_decode_init,
120  .decode = v410_decode_frame,
121  .close = v410_decode_close,
122  .capabilities = CODEC_CAP_DR1,
123  .long_name = NULL_IF_CONFIG_SMALL("Uncompressed 4:4:4 10-bit"),
124 };
This structure describes decoded (raw) audio or video data.
Definition: avcodec.h:989
void(* release_buffer)(struct AVCodecContext *c, AVFrame *pic)
Called to release buffers which were allocated with get_buffer.
Definition: avcodec.h:2259
AVFrame * coded_frame
the picture in the bitstream
Definition: avcodec.h:2725
int size
Definition: avcodec.h:916
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1533
static av_cold int v410_decode_init(AVCodecContext *avctx)
Definition: v410dec.c:28
int bits_per_raw_sample
Bits per sample/pixel of internal libavcodec pixel/sample format.
Definition: avcodec.h:2711
AVCodec.
Definition: avcodec.h:2960
void av_freep(void *arg)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc() and set the pointer ...
Definition: mem.c:151
uint8_t
const char data[16]
Definition: mxf.c:66
uint8_t * data
Definition: avcodec.h:915
int reference
is this picture used as reference The values for this are the same as the MpegEncContext.picture_structure variable, that is 1->top field, 2->bottom field, 3->frame/both fields.
Definition: avcodec.h:1132
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:88
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:146
const char * name
Name of the codec implementation.
Definition: avcodec.h:2967
AVFrame * avcodec_alloc_frame(void)
Allocate an AVFrame and set its fields to default values.
Definition: utils.c:616
enum AVPictureType pict_type
Picture type of the frame, see ?_TYPE below.
Definition: avcodec.h:1065
int err_recognition
Error recognition; may misdetect some more or less valid parts as errors.
Definition: avcodec.h:2602
int width
picture width / height.
Definition: avcodec.h:1508
AVCodec ff_v410_decoder
Definition: v410dec.c:115
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame)
Get a buffer for a frame.
Definition: utils.c:464
#define AV_RL32
Definition: intreadwrite.h:146
static int v410_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: v410dec.c:52
external API header
int linesize[AV_NUM_DATA_POINTERS]
Size, in bytes, of the data for each picture/channel plane.
Definition: avcodec.h:1008
main external API structure.
Definition: avcodec.h:1339
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: avcodec.h:997
common internal api header.
common internal and external API header
int key_frame
1 -> keyframe, 0-> not
Definition: avcodec.h:1058
static av_cold int v410_decode_close(AVCodecContext *avctx)
Definition: v410dec.c:105
This structure stores compressed data.
Definition: avcodec.h:898
for(j=16;j >0;--j)