FFmpeg
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 "codec_internal.h"
24 #include "decode.h"
25 
27 {
29  avctx->bits_per_raw_sample = 14;
30 
31  return 0;
32 }
33 
34 static int y216_decode_frame(AVCodecContext *avctx, AVFrame *pic,
35  int *got_frame, AVPacket *avpkt)
36 {
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->flags |= AV_FRAME_FLAG_KEY;
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  .p.name = "targa_y216",
78  CODEC_LONG_NAME("Pinnacle TARGA CineWave YUV16"),
79  .p.type = AVMEDIA_TYPE_VIDEO,
80  .p.id = AV_CODEC_ID_TARGA_Y216,
81  .init = y216_decode_init,
83  .p.capabilities = AV_CODEC_CAP_DR1,
84 };
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:250
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:340
AVPacket::data
uint8_t * data
Definition: packet.h:491
FFCodec
Definition: codec_internal.h:127
AVFrame::flags
int flags
Frame flags, a combination of AV_FRAME_FLAGS.
Definition: frame.h:649
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:361
FFCodec::p
AVCodec p
The public AVCodec.
Definition: codec_internal.h:131
y216_decode_frame
static int y216_decode_frame(AVCodecContext *avctx, AVFrame *pic, int *got_frame, AVPacket *avpkt)
Definition: targa_y216dec.c:34
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
av_cold
#define av_cold
Definition: attributes.h:90
AV_PIX_FMT_YUV422P16
#define AV_PIX_FMT_YUV422P16
Definition: pixfmt.h:480
AV_FRAME_FLAG_KEY
#define AV_FRAME_FLAG_KEY
A flag to mark frames that are keyframes.
Definition: frame.h:628
FF_CODEC_DECODE_CB
#define FF_CODEC_DECODE_CB(func)
Definition: codec_internal.h:306
AVCodecContext::bits_per_raw_sample
int bits_per_raw_sample
Bits per sample/pixel of internal libavcodec pixel/sample format.
Definition: avcodec.h:1517
decode.h
AV_CODEC_ID_TARGA_Y216
@ AV_CODEC_ID_TARGA_Y216
Definition: codec_id.h:259
CODEC_LONG_NAME
#define CODEC_LONG_NAME(str)
Definition: codec_internal.h:272
AV_PICTURE_TYPE_I
@ AV_PICTURE_TYPE_I
Intra.
Definition: avutil.h:279
y216_decode_init
static av_cold int y216_decode_init(AVCodecContext *avctx)
Definition: targa_y216dec.c:26
AVFrame::pict_type
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:442
ff_get_buffer
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1617
AV_CODEC_CAP_DR1
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:52
AVPacket::size
int size
Definition: packet.h:492
codec_internal.h
for
for(k=2;k<=8;++k)
Definition: h264pred_template.c:425
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:255
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:194
AVCodecContext::height
int height
Definition: avcodec.h:621
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:658
avcodec.h
ret
ret
Definition: filter_design.txt:187
AVCodecContext
main external API structure.
Definition: avcodec.h:441
ff_targa_y216_decoder
const FFCodec ff_targa_y216_decoder
Definition: targa_y216dec.c:76
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
FFALIGN
#define FFALIGN(x, a)
Definition: macros.h:78
AVPacket
This structure stores compressed data.
Definition: packet.h:468
src
INIT_CLIP pixel * src
Definition: h264pred_template.c:418
AVCodecContext::width
int width
picture width / height.
Definition: avcodec.h:621
AVFrame::linesize
int linesize[AV_NUM_DATA_POINTERS]
For video, a positive or negative value, which is typically indicating the size in bytes of each pict...
Definition: frame.h:385
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27