1/*
2 * V210 decoder
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 FFmpeg.
8 *
9 * FFmpeg 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 * FFmpeg 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 FFmpeg; 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 "libavutil/bswap.h"
26
27static av_cold int decode_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    avctx->pix_fmt             = PIX_FMT_YUV422P16;
34    avctx->bits_per_raw_sample = 10;
35
36    avctx->coded_frame         = avcodec_alloc_frame();
37
38    return 0;
39}
40
41static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
42                        AVPacket *avpkt)
43{
44    int h, w;
45    AVFrame *pic = avctx->coded_frame;
46    const uint8_t *psrc = avpkt->data;
47    uint16_t *y, *u, *v;
48    int aligned_width = ((avctx->width + 47) / 48) * 48;
49    int stride = aligned_width * 8 / 3;
50
51    if (pic->data[0])
52        avctx->release_buffer(avctx, pic);
53
54    if (avpkt->size < stride * avctx->height) {
55        av_log(avctx, AV_LOG_ERROR, "packet too small\n");
56        return -1;
57    }
58
59    pic->reference = 0;
60    if (avctx->get_buffer(avctx, pic) < 0)
61        return -1;
62
63    y = (uint16_t*)pic->data[0];
64    u = (uint16_t*)pic->data[1];
65    v = (uint16_t*)pic->data[2];
66    pic->pict_type = FF_I_TYPE;
67    pic->key_frame = 1;
68
69#define READ_PIXELS(a, b, c)         \
70    do {                             \
71        val  = le2me_32(*src++);     \
72        *a++ =  val <<  6;           \
73        *b++ = (val >>  4) & 0xFFC0; \
74        *c++ = (val >> 14) & 0xFFC0; \
75    } while (0)
76
77    for (h = 0; h < avctx->height; h++) {
78        const uint32_t *src = (const uint32_t*)psrc;
79        uint32_t val;
80        for (w = 0; w < avctx->width - 5; w += 6) {
81            READ_PIXELS(u, y, v);
82            READ_PIXELS(y, u, y);
83            READ_PIXELS(v, y, u);
84            READ_PIXELS(y, v, y);
85        }
86        if (w < avctx->width - 1) {
87            READ_PIXELS(u, y, v);
88
89            val  = le2me_32(*src++);
90            *y++ =  val <<  6;
91        }
92        if (w < avctx->width - 3) {
93            *u++ = (val >>  4) & 0xFFC0;
94            *y++ = (val >> 14) & 0xFFC0;
95
96            val  = le2me_32(*src++);
97            *v++ =  val <<  6;
98            *y++ = (val >>  4) & 0xFFC0;
99        }
100
101        psrc += stride;
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    *data_size = sizeof(AVFrame);
108    *(AVFrame*)data = *avctx->coded_frame;
109
110    return avpkt->size;
111}
112
113static av_cold int decode_close(AVCodecContext *avctx)
114{
115    AVFrame *pic = avctx->coded_frame;
116    if (pic->data[0])
117        avctx->release_buffer(avctx, pic);
118    av_freep(&avctx->coded_frame);
119
120    return 0;
121}
122
123AVCodec v210_decoder = {
124    "v210",
125    AVMEDIA_TYPE_VIDEO,
126    CODEC_ID_V210,
127    0,
128    decode_init,
129    NULL,
130    decode_close,
131    decode_frame,
132    CODEC_CAP_DR1,
133    .long_name = NULL_IF_CONFIG_SMALL("Uncompressed 4:2:2 10-bit"),
134};
135