v210enc.c
Go to the documentation of this file.
1 /*
2  * V210 encoder
3  *
4  * Copyright (C) 2009 Michael Niedermayer <michaelni@gmx.at>
5  * Copyright (c) 2009 Baptiste Coudurier <baptiste dot coudurier at gmail dot com>
6  *
7  * This file is part of Libav.
8  *
9  * Libav is free software; you can redistribute it and/or
10  * modify it under the terms of the GNU Lesser General Public
11  * License as published by the Free Software Foundation; either
12  * version 2.1 of the License, or (at your option) any later version.
13  *
14  * Libav is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17  * Lesser General Public License for more details.
18  *
19  * You should have received a copy of the GNU Lesser General Public
20  * License along with Libav; if not, write to the Free Software
21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22  */
23 
24 #include "avcodec.h"
25 #include "bytestream.h"
26 
27 static av_cold int encode_init(AVCodecContext *avctx)
28 {
29  if (avctx->width & 1) {
30  av_log(avctx, AV_LOG_ERROR, "v210 needs even width\n");
31  return -1;
32  }
33 
34  if (avctx->pix_fmt != PIX_FMT_YUV422P10) {
35  av_log(avctx, AV_LOG_ERROR, "v210 needs YUV422P10\n");
36  return -1;
37  }
38 
39  if (avctx->bits_per_raw_sample != 10)
40  av_log(avctx, AV_LOG_WARNING, "bits per raw sample: %d != 10-bit\n",
41  avctx->bits_per_raw_sample);
42 
43  avctx->coded_frame = avcodec_alloc_frame();
44 
45  avctx->coded_frame->key_frame = 1;
46  avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
47 
48  return 0;
49 }
50 
51 static int encode_frame(AVCodecContext *avctx, unsigned char *buf,
52  int buf_size, void *data)
53 {
54  const AVFrame *pic = data;
55  int aligned_width = ((avctx->width + 47) / 48) * 48;
56  int stride = aligned_width * 8 / 3;
57  int h, w;
58  const uint16_t *y = (const uint16_t*)pic->data[0];
59  const uint16_t *u = (const uint16_t*)pic->data[1];
60  const uint16_t *v = (const uint16_t*)pic->data[2];
61  uint8_t *p = buf;
62  uint8_t *pdst = buf;
63 
64  if (buf_size < aligned_width * avctx->height * 8 / 3) {
65  av_log(avctx, AV_LOG_ERROR, "output buffer too small\n");
66  return -1;
67  }
68 
69 #define CLIP(v) av_clip(v, 4, 1019)
70 
71 #define WRITE_PIXELS(a, b, c) \
72  do { \
73  val = CLIP(*a++); \
74  val |= (CLIP(*b++) << 10) | \
75  (CLIP(*c++) << 20); \
76  bytestream_put_le32(&p, val); \
77  } while (0)
78 
79  for (h = 0; h < avctx->height; h++) {
80  uint32_t val;
81  for (w = 0; w < avctx->width - 5; w += 6) {
82  WRITE_PIXELS(u, y, v);
83  WRITE_PIXELS(y, u, y);
84  WRITE_PIXELS(v, y, u);
85  WRITE_PIXELS(y, v, y);
86  }
87  if (w < avctx->width - 1) {
88  WRITE_PIXELS(u, y, v);
89 
90  val = CLIP(*y++);
91  if (w == avctx->width - 2)
92  bytestream_put_le32(&p, val);
93  }
94  if (w < avctx->width - 3) {
95  val |= (CLIP(*u++) << 10) | (CLIP(*y++) << 20);
96  bytestream_put_le32(&p, val);
97 
98  val = CLIP(*v++) | (CLIP(*y++) << 10);
99  bytestream_put_le32(&p, val);
100  }
101 
102  pdst += stride;
103  memset(p, 0, pdst - p);
104  p = pdst;
105  y += pic->linesize[0] / 2 - avctx->width;
106  u += pic->linesize[1] / 2 - avctx->width / 2;
107  v += pic->linesize[2] / 2 - avctx->width / 2;
108  }
109 
110  return p - buf;
111 }
112 
113 static av_cold int encode_close(AVCodecContext *avctx)
114 {
115  av_freep(&avctx->coded_frame);
116 
117  return 0;
118 }
119 
120 AVCodec ff_v210_encoder = {
121  .name = "v210",
122  .type = AVMEDIA_TYPE_VIDEO,
123  .id = CODEC_ID_V210,
124  .init = encode_init,
125  .encode = encode_frame,
126  .close = encode_close,
127  .pix_fmts = (const enum PixelFormat[]){PIX_FMT_YUV422P10, PIX_FMT_NONE},
128  .long_name = NULL_IF_CONFIG_SMALL("Uncompressed 4:2:2 10-bit"),
129 };