v210enc: use stride as it is already calculated
[libav.git] / libavcodec / 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 *
2912e87a 7 * This file is part of Libav.
ca0bb1c4 8 *
2912e87a 9 * Libav is free software; you can redistribute it and/or
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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 *
2912e87a 14 * Libav is distributed in the hope that it will be useful,
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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
2912e87a 20 * License along with Libav; if not, write to the Free Software
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21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
24#include "avcodec.h"
dc25d79f 25#include "bytestream.h"
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26
27static 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");
b5f50da5 31 return AVERROR(EINVAL);
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32 }
33
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34 if (avctx->pix_fmt != PIX_FMT_YUV422P10) {
35 av_log(avctx, AV_LOG_ERROR, "v210 needs YUV422P10\n");
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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();
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44 if (!avctx->coded_frame)
45 return AVERROR(ENOMEM);
ca0bb1c4 46
975a1447 47 avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
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48
49 return 0;
50}
51
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52static int encode_frame(AVCodecContext *avctx, unsigned char *buf,
53 int buf_size, void *data)
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54{
55 const AVFrame *pic = data;
7ad1b612 56 int aligned_width = FFALIGN(avctx->width, 48);
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57 int stride = aligned_width * 8 / 3;
58 int h, w;
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59 const uint16_t *y = (const uint16_t*)pic->data[0];
60 const uint16_t *u = (const uint16_t*)pic->data[1];
61 const uint16_t *v = (const uint16_t*)pic->data[2];
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62 uint8_t *p = buf;
63 uint8_t *pdst = buf;
64
986c1c48 65 if (buf_size < avctx->height * stride) {
ca0bb1c4 66 av_log(avctx, AV_LOG_ERROR, "output buffer too small\n");
b5f50da5 67 return AVERROR(ENOMEM);
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68 }
69
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70#define CLIP(v) av_clip(v, 4, 1019)
71
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72#define WRITE_PIXELS(a, b, c) \
73 do { \
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74 val = CLIP(*a++); \
75 val |= (CLIP(*b++) << 10) | \
76 (CLIP(*c++) << 20); \
ca0bb1c4 77 bytestream_put_le32(&p, val); \
e20b196d 78 } while (0)
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79
80 for (h = 0; h < avctx->height; h++) {
81 uint32_t val;
82 for (w = 0; w < avctx->width - 5; w += 6) {
83 WRITE_PIXELS(u, y, v);
84 WRITE_PIXELS(y, u, y);
85 WRITE_PIXELS(v, y, u);
86 WRITE_PIXELS(y, v, y);
87 }
88 if (w < avctx->width - 1) {
89 WRITE_PIXELS(u, y, v);
90
635bbecf 91 val = CLIP(*y++);
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92 if (w == avctx->width - 2)
93 bytestream_put_le32(&p, val);
94 }
95 if (w < avctx->width - 3) {
635bbecf 96 val |= (CLIP(*u++) << 10) | (CLIP(*y++) << 20);
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97 bytestream_put_le32(&p, val);
98
635bbecf 99 val = CLIP(*v++) | (CLIP(*y++) << 10);
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100 bytestream_put_le32(&p, val);
101 }
102
103 pdst += stride;
104 memset(p, 0, pdst - p);
105 p = pdst;
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106 y += pic->linesize[0] / 2 - avctx->width;
107 u += pic->linesize[1] / 2 - avctx->width / 2;
108 v += pic->linesize[2] / 2 - avctx->width / 2;
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109 }
110
111 return p - buf;
112}
113
114static av_cold int encode_close(AVCodecContext *avctx)
115{
116 av_freep(&avctx->coded_frame);
117
118 return 0;
119}
120
d36beb3f 121AVCodec ff_v210_encoder = {
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122 .name = "v210",
123 .type = AVMEDIA_TYPE_VIDEO,
124 .id = CODEC_ID_V210,
125 .init = encode_init,
126 .encode = encode_frame,
127 .close = encode_close,
d239b83e 128 .pix_fmts = (const enum PixelFormat[]){PIX_FMT_YUV422P10, PIX_FMT_NONE},
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129 .long_name = NULL_IF_CONFIG_SMALL("Uncompressed 4:2:2 10-bit"),
130};