FFmpeg
012v.c
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1 /*
2  * 012v decoder
3  *
4  * Copyright (C) 2012 Carl Eugen Hoyos
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #include "avcodec.h"
24 #include "codec_internal.h"
25 #include "decode.h"
26 #include "libavutil/intreadwrite.h"
27 
29 {
31  avctx->bits_per_raw_sample = 10;
32 
33  if (avctx->codec_tag == MKTAG('a', '1', '2', 'v'))
34  avpriv_request_sample(avctx, "transparency");
35 
36  return 0;
37 }
38 
40  int *got_frame, AVPacket *avpkt)
41 {
42  int line, ret;
43  const int width = avctx->width;
44  uint16_t *y, *u, *v;
45  const uint8_t *line_end, *src = avpkt->data;
46  int stride = avctx->width * 8 / 3;
47 
48  if (width <= 1 || avctx->height <= 0) {
49  av_log(avctx, AV_LOG_ERROR, "Dimensions %dx%d not supported.\n", width, avctx->height);
50  return AVERROR_INVALIDDATA;
51  }
52 
53  if ( avctx->codec_tag == MKTAG('0', '1', '2', 'v')
54  && avpkt->size % avctx->height == 0
55  && avpkt->size / avctx->height * 3 >= width * 8)
56  stride = avpkt->size / avctx->height;
57 
58  if (avpkt->size < avctx->height * stride) {
59  av_log(avctx, AV_LOG_ERROR, "Packet too small: %d instead of %d\n",
60  avpkt->size, avctx->height * stride);
61  return AVERROR_INVALIDDATA;
62  }
63 
64  if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
65  return ret;
66 
67  line_end = avpkt->data + stride;
68  for (line = 0; line < avctx->height; line++) {
69  uint16_t y_temp[6] = {0x8000, 0x8000, 0x8000, 0x8000, 0x8000, 0x8000};
70  uint16_t u_temp[3] = {0x8000, 0x8000, 0x8000};
71  uint16_t v_temp[3] = {0x8000, 0x8000, 0x8000};
72  int x;
73  y = (uint16_t *)(pic->data[0] + line * pic->linesize[0]);
74  u = (uint16_t *)(pic->data[1] + line * pic->linesize[1]);
75  v = (uint16_t *)(pic->data[2] + line * pic->linesize[2]);
76 
77  for (x = 0; x < width; x += 6) {
78  uint32_t t;
79 
80  if (width - x < 6 || line_end - src < 16) {
81  y = y_temp;
82  u = u_temp;
83  v = v_temp;
84  }
85 
86  if (line_end - src < 4)
87  break;
88 
89  t = AV_RL32(src);
90  src += 4;
91  *u++ = t << 6 & 0xFFC0;
92  *y++ = t >> 4 & 0xFFC0;
93  *v++ = t >> 14 & 0xFFC0;
94 
95  if (line_end - src < 4)
96  break;
97 
98  t = AV_RL32(src);
99  src += 4;
100  *y++ = t << 6 & 0xFFC0;
101  *u++ = t >> 4 & 0xFFC0;
102  *y++ = t >> 14 & 0xFFC0;
103 
104  if (line_end - src < 4)
105  break;
106 
107  t = AV_RL32(src);
108  src += 4;
109  *v++ = t << 6 & 0xFFC0;
110  *y++ = t >> 4 & 0xFFC0;
111  *u++ = t >> 14 & 0xFFC0;
112 
113  if (line_end - src < 4)
114  break;
115 
116  t = AV_RL32(src);
117  src += 4;
118  *y++ = t << 6 & 0xFFC0;
119  *v++ = t >> 4 & 0xFFC0;
120  *y++ = t >> 14 & 0xFFC0;
121 
122  if (width - x < 6)
123  break;
124  }
125 
126  if (x < width) {
127  y = x + (uint16_t *)(pic->data[0] + line * pic->linesize[0]);
128  u = x/2 + (uint16_t *)(pic->data[1] + line * pic->linesize[1]);
129  v = x/2 + (uint16_t *)(pic->data[2] + line * pic->linesize[2]);
130  memcpy(y, y_temp, sizeof(*y) * (width - x));
131  memcpy(u, u_temp, sizeof(*u) * ((width - x + 1) / 2));
132  memcpy(v, v_temp, sizeof(*v) * ((width - x + 1) / 2));
133  }
134 
135  line_end += stride;
136  src = line_end - stride;
137  }
138 
139  *got_frame = 1;
140 
141  return avpkt->size;
142 }
143 
145  .p.name = "012v",
146  CODEC_LONG_NAME("Uncompressed 4:2:2 10-bit"),
147  .p.type = AVMEDIA_TYPE_VIDEO,
148  .p.id = AV_CODEC_ID_012V,
149  .init = zero12v_decode_init,
151  .p.capabilities = AV_CODEC_CAP_DR1,
152 };
zero12v_decode_init
static av_cold int zero12v_decode_init(AVCodecContext *avctx)
Definition: 012v.c:28
u
#define u(width, name, range_min, range_max)
Definition: cbs_h2645.c:251
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:374
AVPacket::data
uint8_t * data
Definition: packet.h:524
FFCodec
Definition: codec_internal.h:126
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:395
FFCodec::p
AVCodec p
The public AVCodec.
Definition: codec_internal.h:130
zero12v_decode_frame
static int zero12v_decode_frame(AVCodecContext *avctx, AVFrame *pic, int *got_frame, AVPacket *avpkt)
Definition: 012v.c:39
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:490
width
#define width
FF_CODEC_DECODE_CB
#define FF_CODEC_DECODE_CB(func)
Definition: codec_internal.h:286
intreadwrite.h
AVCodecContext::bits_per_raw_sample
int bits_per_raw_sample
Bits per sample/pixel of internal libavcodec pixel/sample format.
Definition: avcodec.h:1575
decode.h
CODEC_LONG_NAME
#define CODEC_LONG_NAME(str)
Definition: codec_internal.h:271
ff_get_buffer
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1575
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:525
codec_internal.h
height
#define height
line
Definition: graph2dot.c:48
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:194
AVCodecContext::height
int height
Definition: avcodec.h:618
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:657
avcodec.h
stride
#define stride
Definition: h264pred_template.c:537
ret
ret
Definition: filter_design.txt:187
AV_RL32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:92
AVCodecContext
main external API structure.
Definition: avcodec.h:445
ff_zero12v_decoder
const FFCodec ff_zero12v_decoder
Definition: 012v.c:144
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
avpriv_request_sample
#define avpriv_request_sample(...)
Definition: tableprint_vlc.h:36
AVCodecContext::codec_tag
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
Definition: avcodec.h:470
AVPacket
This structure stores compressed data.
Definition: packet.h:501
src
INIT_CLIP pixel * src
Definition: h264pred_template.c:418
AVCodecContext::width
int width
picture width / height.
Definition: avcodec.h:618
AV_CODEC_ID_012V
@ AV_CODEC_ID_012V
Definition: codec_id.h:254
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:419
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
MKTAG
#define MKTAG(a, b, c, d)
Definition: macros.h:55
line
The official guide to swscale for confused that consecutive non overlapping rectangles of slice_bottom special converter These generally are unscaled converters of common like for each output line the vertical scaler pulls lines from a ring buffer When the ring buffer does not contain the wanted line
Definition: swscale.txt:40