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
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");
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
51static 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
113static av_cold int encode_close(AVCodecContext *avctx)
114{
115    av_freep(&avctx->coded_frame);
116
117    return 0;
118}
119
120AVCodec 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};
130