FFmpeg
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 };
AVCodec
AVCodec.
Definition: avcodec.h:3481
AVERROR
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
u
#define u(width, name, range_min, range_max)
Definition: cbs_h2645.c:252
y216_decode_frame
static int y216_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: targa_y216dec.c:33
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:295
internal.h
AVPacket::data
uint8_t * data
Definition: avcodec.h:1477
data
const char data[16]
Definition: mxf.c:91
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:309
AVFrame::key_frame
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:373
src
#define src
Definition: vp8dsp.c:254
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
av_cold
#define av_cold
Definition: attributes.h:84
AV_PIX_FMT_YUV422P16
#define AV_PIX_FMT_YUV422P16
Definition: pixfmt.h:399
ff_targa_y216_decoder
AVCodec ff_targa_y216_decoder
Definition: targa_y216dec.c:76
AVCodecContext::bits_per_raw_sample
int bits_per_raw_sample
Bits per sample/pixel of internal libavcodec pixel/sample format.
Definition: avcodec.h:2796
AV_CODEC_ID_TARGA_Y216
@ AV_CODEC_ID_TARGA_Y216
Definition: avcodec.h:419
AV_PICTURE_TYPE_I
@ AV_PICTURE_TYPE_I
Intra.
Definition: avutil.h:274
y216_decode_init
static av_cold int y216_decode_init(AVCodecContext *avctx)
Definition: targa_y216dec.c:25
for
for(j=16;j >0;--j)
Definition: h264pred_template.c:469
AVFrame::pict_type
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:378
ff_get_buffer
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1965
AV_CODEC_CAP_DR1
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:981
AVPacket::size
int size
Definition: avcodec.h:1478
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:188
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:259
AVCodec::name
const char * name
Name of the codec implementation.
Definition: avcodec.h:3488
AVCodecContext::height
int height
Definition: avcodec.h:1738
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1775
avcodec.h
ret
ret
Definition: filter_design.txt:187
AVCodecContext
main external API structure.
Definition: avcodec.h:1565
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
FFALIGN
#define FFALIGN(x, a)
Definition: macros.h:48
AVPacket
This structure stores compressed data.
Definition: avcodec.h:1454
AVCodecContext::width
int width
picture width / height.
Definition: avcodec.h:1738
AVFrame::linesize
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:326
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28