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 {
77 
78  return 0;
79 }
80 
82  .name = "targa_y216",
83  .type = AVMEDIA_TYPE_VIDEO,
85  .init = y216_decode_init,
86  .decode = y216_decode_frame,
87  .close = y216_decode_close,
88  .capabilities = CODEC_CAP_DR1,
89  .long_name = NULL_IF_CONFIG_SMALL("Pinnacle TARGA CineWave YUV16"),
90 };
float v
This structure describes decoded (raw) audio or video data.
Definition: frame.h:76
static int y216_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: targa_y216dec.c:33
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
int bits_per_raw_sample
Bits per sample/pixel of internal libavcodec pixel/sample format.
#define FFALIGN(x, a)
Definition: common.h:63
#define av_cold
Definition: attributes.h:78
#define CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
uint8_t * data
AVCodec ff_targa_y216_decoder
Definition: targa_y216dec.c:81
static av_cold int y216_decode_close(AVCodecContext *avctx)
Definition: targa_y216dec.c:75
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Spectrum Plot time data
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:246
const char * name
Name of the codec implementation.
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:144
ret
Definition: avfilter.c:821
int width
picture width / height.
float u
AVS_Value src
Definition: avisynth_c.h:523
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:101
main external API structure.
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:148
synthesis window for stochastic i
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFilterBuffer 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.Buffer references ownership and permissions
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:87
common internal api header.
function y
Definition: D.m:1
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:139
This structure stores compressed data.
#define AV_PIX_FMT_YUV422P16
Definition: pixfmt.h:289
for(j=16;j >0;--j)