1/*
2 * 012v decoder
3 *
4 * Copyright (C) 2012 Carl Eugen Hoyos
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23#include "avcodec.h"
24#include "internal.h"
25#include "libavutil/intreadwrite.h"
26
27static av_cold int zero12v_decode_init(AVCodecContext *avctx)
28{
29    avctx->pix_fmt             = AV_PIX_FMT_YUV422P16;
30    avctx->bits_per_raw_sample = 10;
31
32    if (avctx->codec_tag == MKTAG('a', '1', '2', 'v'))
33        avpriv_request_sample(avctx, "transparency");
34
35    return 0;
36}
37
38static int zero12v_decode_frame(AVCodecContext *avctx, void *data,
39                                int *got_frame, AVPacket *avpkt)
40{
41    int line = 0, ret;
42    const int width = avctx->width;
43    AVFrame *pic = data;
44    uint16_t *y, *u, *v;
45    const uint8_t *line_end, *src = avpkt->data;
46    int stride = avctx->width * 8 / 3;
47
48    if (width == 1) {
49        av_log(avctx, AV_LOG_ERROR, "Width 1 not supported.\n");
50        return AVERROR_INVALIDDATA;
51    }
52
53    if (   avctx->codec_tag == MKTAG('0', '1', '2', 'v')
54        && avpkt->size % avctx->height == 0
55        && avpkt->size / avctx->height * 3 >= width * 8)
56        stride = avpkt->size / avctx->height;
57
58    if (avpkt->size < avctx->height * stride) {
59        av_log(avctx, AV_LOG_ERROR, "Packet too small: %d instead of %d\n",
60               avpkt->size, avctx->height * stride);
61        return AVERROR_INVALIDDATA;
62    }
63
64    if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
65        return ret;
66
67    pic->pict_type = AV_PICTURE_TYPE_I;
68    pic->key_frame = 1;
69
70    y = (uint16_t *)pic->data[0];
71    u = (uint16_t *)pic->data[1];
72    v = (uint16_t *)pic->data[2];
73    line_end = avpkt->data + stride;
74
75    while (line++ < avctx->height) {
76        while (1) {
77            uint32_t t = AV_RL32(src);
78            src += 4;
79            *u++ = t <<  6 & 0xFFC0;
80            *y++ = t >>  4 & 0xFFC0;
81            *v++ = t >> 14 & 0xFFC0;
82
83            if (src >= line_end - 1) {
84                *y = 0x80;
85                src++;
86                line_end += stride;
87                y = (uint16_t *)(pic->data[0] + line * pic->linesize[0]);
88                u = (uint16_t *)(pic->data[1] + line * pic->linesize[1]);
89                v = (uint16_t *)(pic->data[2] + line * pic->linesize[2]);
90                break;
91            }
92
93            t = AV_RL32(src);
94            src += 4;
95            *y++ = t <<  6 & 0xFFC0;
96            *u++ = t >>  4 & 0xFFC0;
97            *y++ = t >> 14 & 0xFFC0;
98            if (src >= line_end - 2) {
99                if (!(width & 1)) {
100                    *y = 0x80;
101                    src += 2;
102                }
103                line_end += stride;
104                y = (uint16_t *)(pic->data[0] + line * pic->linesize[0]);
105                u = (uint16_t *)(pic->data[1] + line * pic->linesize[1]);
106                v = (uint16_t *)(pic->data[2] + line * pic->linesize[2]);
107                break;
108            }
109
110            t = AV_RL32(src);
111            src += 4;
112            *v++ = t <<  6 & 0xFFC0;
113            *y++ = t >>  4 & 0xFFC0;
114            *u++ = t >> 14 & 0xFFC0;
115
116            if (src >= line_end - 1) {
117                *y = 0x80;
118                src++;
119                line_end += stride;
120                y = (uint16_t *)(pic->data[0] + line * pic->linesize[0]);
121                u = (uint16_t *)(pic->data[1] + line * pic->linesize[1]);
122                v = (uint16_t *)(pic->data[2] + line * pic->linesize[2]);
123                break;
124            }
125
126            t = AV_RL32(src);
127            src += 4;
128            *y++ = t <<  6 & 0xFFC0;
129            *v++ = t >>  4 & 0xFFC0;
130            *y++ = t >> 14 & 0xFFC0;
131
132            if (src >= line_end - 2) {
133                if (width & 1) {
134                    *y = 0x80;
135                    src += 2;
136                }
137                line_end += stride;
138                y = (uint16_t *)(pic->data[0] + line * pic->linesize[0]);
139                u = (uint16_t *)(pic->data[1] + line * pic->linesize[1]);
140                v = (uint16_t *)(pic->data[2] + line * pic->linesize[2]);
141                break;
142            }
143        }
144    }
145
146    *got_frame = 1;
147
148    return avpkt->size;
149}
150
151AVCodec ff_zero12v_decoder = {
152    .name           = "012v",
153    .long_name      = NULL_IF_CONFIG_SMALL("Uncompressed 4:2:2 10-bit"),
154    .type           = AVMEDIA_TYPE_VIDEO,
155    .id             = AV_CODEC_ID_012V,
156    .init           = zero12v_decode_init,
157    .decode         = zero12v_decode_frame,
158    .capabilities   = CODEC_CAP_DR1,
159};
160