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targa_y216dec.c
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1 /*
2  * Pinnacle TARGA CineWave YUV16 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  avctx->bits_per_raw_sample = 14;
29 
30  return 0;
31 }
32 
33 static int y216_decode_frame(AVCodecContext *avctx, void *data,
34  int *got_frame, AVPacket *avpkt)
35 {
36  AVFrame *pic = data;
37  const uint16_t *src = (uint16_t *)avpkt->data;
38  uint16_t *y, *u, *v, aligned_width = FFALIGN(avctx->width, 4);
39  int i, j, ret;
40 
41  if (avpkt->size < 4 * avctx->height * aligned_width) {
42  av_log(avctx, AV_LOG_ERROR, "Insufficient input data.\n");
43  return AVERROR(EINVAL);
44  }
45 
46  if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
47  return ret;
48 
49  pic->key_frame = 1;
51 
52  y = (uint16_t *)pic->data[0];
53  u = (uint16_t *)pic->data[1];
54  v = (uint16_t *)pic->data[2];
55 
56  for (i = 0; i < avctx->height; i++) {
57  for (j = 0; j < avctx->width >> 1; j++) {
58  u[ j ] = src[4 * j ] << 2 | src[4 * j ] >> 14;
59  y[2 * j ] = src[4 * j + 1] << 2 | src[4 * j + 1] >> 14;
60  v[ j ] = src[4 * j + 2] << 2 | src[4 * j + 2] >> 14;
61  y[2 * j + 1] = src[4 * j + 3] << 2 | src[4 * j + 3] >> 14;
62  }
63 
64  y += pic->linesize[0] >> 1;
65  u += pic->linesize[1] >> 1;
66  v += pic->linesize[2] >> 1;
67  src += aligned_width << 1;
68  }
69 
70  *got_frame = 1;
71 
72  return avpkt->size;
73 }
74 
76  .name = "targa_y216",
77  .long_name = NULL_IF_CONFIG_SMALL("Pinnacle TARGA CineWave YUV16"),
78  .type = AVMEDIA_TYPE_VIDEO,
80  .init = y216_decode_init,
81  .decode = y216_decode_frame,
82  .capabilities = CODEC_CAP_DR1,
83 };
float v
This structure describes decoded (raw) audio or video data.
Definition: frame.h:171
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
static int y216_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: targa_y216dec.c:33
int size
Definition: avcodec.h:1188
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1486
int bits_per_raw_sample
Bits per sample/pixel of internal libavcodec pixel/sample format.
Definition: avcodec.h:2770
AVCodec.
Definition: avcodec.h:3239
#define FFALIGN(x, a)
Definition: common.h:71
#define av_cold
Definition: attributes.h:74
#define CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:794
uint8_t * data
Definition: avcodec.h:1187
AVCodec ff_targa_y216_decoder
Definition: targa_y216dec.c:75
#define av_log(a,...)
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
#define AVERROR(e)
Definition: error.h:43
#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:3246
Libavcodec external API header.
static av_cold int y216_decode_init(AVCodecContext *avctx)
Definition: targa_y216dec.c:25
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:1445
float u
AVS_Value src
Definition: avisynth_c.h:482
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:1266
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: utils.c:1040
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:182
common internal api header.
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:237
This structure stores compressed data.
Definition: avcodec.h:1164
#define AV_PIX_FMT_YUV422P16
Definition: pixfmt.h:378
for(j=16;j >0;--j)