FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
targa_y216dec.c
Go to the documentation of this file.
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;
39  int aligned_width = FFALIGN(avctx->width, 4);
40  int i, j, ret;
41 
42  if (avpkt->size < 4 * avctx->height * aligned_width) {
43  av_log(avctx, AV_LOG_ERROR, "Insufficient input data.\n");
44  return AVERROR(EINVAL);
45  }
46 
47  if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
48  return ret;
49 
50  pic->key_frame = 1;
52 
53  y = (uint16_t *)pic->data[0];
54  u = (uint16_t *)pic->data[1];
55  v = (uint16_t *)pic->data[2];
56 
57  for (i = 0; i < avctx->height; i++) {
58  for (j = 0; j < avctx->width >> 1; j++) {
59  u[ j ] = src[4 * j ] << 2 | src[4 * j ] >> 14;
60  y[2 * j ] = src[4 * j + 1] << 2 | src[4 * j + 1] >> 14;
61  v[ j ] = src[4 * j + 2] << 2 | src[4 * j + 2] >> 14;
62  y[2 * j + 1] = src[4 * j + 3] << 2 | src[4 * j + 3] >> 14;
63  }
64 
65  y += pic->linesize[0] >> 1;
66  u += pic->linesize[1] >> 1;
67  v += pic->linesize[2] >> 1;
68  src += aligned_width << 1;
69  }
70 
71  *got_frame = 1;
72 
73  return avpkt->size;
74 }
75 
77  .name = "targa_y216",
78  .long_name = NULL_IF_CONFIG_SMALL("Pinnacle TARGA CineWave YUV16"),
79  .type = AVMEDIA_TYPE_VIDEO,
81  .init = y216_decode_init,
82  .decode = y216_decode_frame,
83  .capabilities = AV_CODEC_CAP_DR1,
84 };
This structure describes decoded (raw) audio or video data.
Definition: frame.h:201
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:1662
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1971
int bits_per_raw_sample
Bits per sample/pixel of internal libavcodec pixel/sample format.
Definition: avcodec.h:3146
#define src
Definition: vp8dsp.c:254
AVCodec.
Definition: avcodec.h:3721
#define av_cold
Definition: attributes.h:82
#define u(width, name, range_min, range_max)
Definition: cbs_h2645.c:343
uint8_t * data
Definition: avcodec.h:1661
AVCodec ff_targa_y216_decoder
Definition: targa_y216dec.c:76
#define FFALIGN(x, a)
Definition: macros.h:48
#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:179
const char * name
Name of the codec implementation.
Definition: avcodec.h:3728
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:284
int width
picture width / height.
Definition: avcodec.h:1930
Libavcodec external API header.
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:232
main external API structure.
Definition: avcodec.h:1743
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1604
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:215
common internal api header.
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:279
This structure stores compressed data.
Definition: avcodec.h:1638
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:996
#define AV_PIX_FMT_YUV422P16
Definition: pixfmt.h:388
for(j=16;j >0;--j)