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 "codec_internal.h"
25 #include "internal.h"
26 #include "libavutil/intreadwrite.h"
27
zero12v_decode_init(AVCodecContext * avctx)28 static av_cold int zero12v_decode_init(AVCodecContext *avctx)
29 {
30 avctx->pix_fmt = AV_PIX_FMT_YUV422P16;
31 avctx->bits_per_raw_sample = 10;
32
33 if (avctx->codec_tag == MKTAG('a', '1', '2', 'v'))
34 avpriv_request_sample(avctx, "transparency");
35
36 return 0;
37 }
38
zero12v_decode_frame(AVCodecContext * avctx,AVFrame * pic,int * got_frame,AVPacket * avpkt)39 static int zero12v_decode_frame(AVCodecContext *avctx, AVFrame *pic,
40 int *got_frame, AVPacket *avpkt)
41 {
42 int line, ret;
43 const int width = avctx->width;
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 || avctx->height <= 0) {
49 av_log(avctx, AV_LOG_ERROR, "Dimensions %dx%d not supported.\n", width, avctx->height);
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 line_end = avpkt->data + stride;
71 for (line = 0; line < avctx->height; line++) {
72 uint16_t y_temp[6] = {0x8000, 0x8000, 0x8000, 0x8000, 0x8000, 0x8000};
73 uint16_t u_temp[3] = {0x8000, 0x8000, 0x8000};
74 uint16_t v_temp[3] = {0x8000, 0x8000, 0x8000};
75 int x;
76 y = (uint16_t *)(pic->data[0] + line * pic->linesize[0]);
77 u = (uint16_t *)(pic->data[1] + line * pic->linesize[1]);
78 v = (uint16_t *)(pic->data[2] + line * pic->linesize[2]);
79
80 for (x = 0; x < width; x += 6) {
81 uint32_t t;
82
83 if (width - x < 6 || line_end - src < 16) {
84 y = y_temp;
85 u = u_temp;
86 v = v_temp;
87 }
88
89 if (line_end - src < 4)
90 break;
91
92 t = AV_RL32(src);
93 src += 4;
94 *u++ = t << 6 & 0xFFC0;
95 *y++ = t >> 4 & 0xFFC0;
96 *v++ = t >> 14 & 0xFFC0;
97
98 if (line_end - src < 4)
99 break;
100
101 t = AV_RL32(src);
102 src += 4;
103 *y++ = t << 6 & 0xFFC0;
104 *u++ = t >> 4 & 0xFFC0;
105 *y++ = t >> 14 & 0xFFC0;
106
107 if (line_end - src < 4)
108 break;
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 (line_end - src < 4)
117 break;
118
119 t = AV_RL32(src);
120 src += 4;
121 *y++ = t << 6 & 0xFFC0;
122 *v++ = t >> 4 & 0xFFC0;
123 *y++ = t >> 14 & 0xFFC0;
124
125 if (width - x < 6)
126 break;
127 }
128
129 if (x < width) {
130 y = x + (uint16_t *)(pic->data[0] + line * pic->linesize[0]);
131 u = x/2 + (uint16_t *)(pic->data[1] + line * pic->linesize[1]);
132 v = x/2 + (uint16_t *)(pic->data[2] + line * pic->linesize[2]);
133 memcpy(y, y_temp, sizeof(*y) * (width - x));
134 memcpy(u, u_temp, sizeof(*u) * ((width - x + 1) / 2));
135 memcpy(v, v_temp, sizeof(*v) * ((width - x + 1) / 2));
136 }
137
138 line_end += stride;
139 src = line_end - stride;
140 }
141
142 *got_frame = 1;
143
144 return avpkt->size;
145 }
146
147 const FFCodec ff_zero12v_decoder = {
148 .p.name = "012v",
149 .p.long_name = NULL_IF_CONFIG_SMALL("Uncompressed 4:2:2 10-bit"),
150 .p.type = AVMEDIA_TYPE_VIDEO,
151 .p.id = AV_CODEC_ID_012V,
152 .init = zero12v_decode_init,
153 FF_CODEC_DECODE_CB(zero12v_decode_frame),
154 .p.capabilities = AV_CODEC_CAP_DR1,
155 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
156 };
157