Libav
v210enc.c
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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 #include "internal.h"
27 
29 {
30  if (avctx->width & 1) {
31  av_log(avctx, AV_LOG_ERROR, "v210 needs even width\n");
32  return AVERROR(EINVAL);
33  }
34 
35  if (avctx->bits_per_raw_sample != 10)
36  av_log(avctx, AV_LOG_WARNING, "bits per raw sample: %d != 10-bit\n",
37  avctx->bits_per_raw_sample);
38 
39  avctx->coded_frame = av_frame_alloc();
40  if (!avctx->coded_frame)
41  return AVERROR(ENOMEM);
42 
44 
45  return 0;
46 }
47 
48 static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
49  const AVFrame *pic, int *got_packet)
50 {
51  int aligned_width = ((avctx->width + 47) / 48) * 48;
52  int stride = aligned_width * 8 / 3;
53  int line_padding = stride - ((avctx->width * 8 + 11) / 12) * 4;
54  int h, w, ret;
55  const uint16_t *y = (const uint16_t*)pic->data[0];
56  const uint16_t *u = (const uint16_t*)pic->data[1];
57  const uint16_t *v = (const uint16_t*)pic->data[2];
59 
60  if ((ret = ff_alloc_packet(pkt, avctx->height * stride)) < 0) {
61  av_log(avctx, AV_LOG_ERROR, "Error getting output packet.\n");
62  return ret;
63  }
64 
65  bytestream2_init_writer(&p, pkt->data, pkt->size);
66 
67 #define CLIP(v) av_clip(v, 4, 1019)
68 
69 #define WRITE_PIXELS(a, b, c) \
70  do { \
71  val = CLIP(*a++); \
72  val |= (CLIP(*b++) << 10) | \
73  (CLIP(*c++) << 20); \
74  bytestream2_put_le32u(&p, val); \
75  } while (0)
76 
77  for (h = 0; h < avctx->height; h++) {
78  uint32_t val;
79  for (w = 0; w < avctx->width - 5; w += 6) {
80  WRITE_PIXELS(u, y, v);
81  WRITE_PIXELS(y, u, y);
82  WRITE_PIXELS(v, y, u);
83  WRITE_PIXELS(y, v, y);
84  }
85  if (w < avctx->width - 1) {
86  WRITE_PIXELS(u, y, v);
87 
88  val = CLIP(*y++);
89  if (w == avctx->width - 2)
90  bytestream2_put_le32u(&p, val);
91  }
92  if (w < avctx->width - 3) {
93  val |= (CLIP(*u++) << 10) | (CLIP(*y++) << 20);
94  bytestream2_put_le32u(&p, val);
95 
96  val = CLIP(*v++) | (CLIP(*y++) << 10);
97  bytestream2_put_le32u(&p, val);
98  }
99 
100  bytestream2_set_buffer(&p, 0, line_padding);
101 
102  y += pic->linesize[0] / 2 - avctx->width;
103  u += pic->linesize[1] / 2 - avctx->width / 2;
104  v += pic->linesize[2] / 2 - avctx->width / 2;
105  }
106 
107  pkt->flags |= AV_PKT_FLAG_KEY;
108  *got_packet = 1;
109  return 0;
110 }
111 
113 {
114  av_freep(&avctx->coded_frame);
115 
116  return 0;
117 }
118 
120  .name = "v210",
121  .long_name = NULL_IF_CONFIG_SMALL("Uncompressed 4:2:2 10-bit"),
122  .type = AVMEDIA_TYPE_VIDEO,
123  .id = AV_CODEC_ID_V210,
124  .init = encode_init,
125  .encode2 = encode_frame,
126  .close = encode_close,
127  .pix_fmts = (const enum AVPixelFormat[]){ AV_PIX_FMT_YUV422P10, AV_PIX_FMT_NONE },
128 };