blob: d2549668fd6b9a29dfffde0592549434d07e9f97
1 | /* |
2 | * Copyright (c) 2016 Michael Niedermayer |
3 | * |
4 | * This file is part of FFmpeg. |
5 | * |
6 | * FFmpeg is free software; you can redistribute it and/or |
7 | * modify it under the terms of the GNU Lesser General Public |
8 | * License as published by the Free Software Foundation; either |
9 | * version 2.1 of the License, or (at your option) any later version. |
10 | * |
11 | * FFmpeg is distributed in the hope that it will be useful, |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
14 | * Lesser General Public License for more details. |
15 | * |
16 | * You should have received a copy of the GNU Lesser General Public |
17 | * License along with FFmpeg; if not, write to the Free Software |
18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
19 | */ |
20 | |
21 | #include "libavutil/intreadwrite.h" |
22 | |
23 | #include "avcodec.h" |
24 | #include "internal.h" |
25 | |
26 | |
27 | static av_cold int m101_decode_init(AVCodecContext *avctx) |
28 | { |
29 | if (avctx->extradata_size < 6*4) { |
30 | avpriv_request_sample(avctx, "Missing or too small extradata (size %d)", avctx->extradata_size); |
31 | return AVERROR_INVALIDDATA; |
32 | } |
33 | |
34 | if (avctx->extradata[2*4] == 10) |
35 | avctx->pix_fmt = AV_PIX_FMT_YUV422P10; |
36 | else if (avctx->extradata[2*4] == 8) { |
37 | avctx->pix_fmt = AV_PIX_FMT_YUYV422; |
38 | } else { |
39 | avpriv_request_sample(avctx, "BPS %d", avctx->extradata[2*4]); |
40 | return AVERROR_INVALIDDATA; |
41 | } |
42 | |
43 | return 0; |
44 | } |
45 | |
46 | static int m101_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, |
47 | AVPacket *avpkt) |
48 | { |
49 | const uint8_t *buf = avpkt->data; |
50 | int stride, ret; |
51 | int x, y; |
52 | int min_stride = 2 * avctx->width; |
53 | int bits = avctx->extradata[2*4]; |
54 | AVFrame *frame = data; |
55 | |
56 | if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
57 | return ret; |
58 | frame->pict_type = AV_PICTURE_TYPE_I; |
59 | frame->key_frame = 1; |
60 | |
61 | stride = AV_RL32(avctx->extradata + 5*4); |
62 | |
63 | if (avctx->pix_fmt == AV_PIX_FMT_YUV422P10) |
64 | min_stride = (avctx->width + 15) / 16 * 20; |
65 | |
66 | if (stride < min_stride || avpkt->size < stride * (uint64_t)avctx->height) { |
67 | av_log(avctx, AV_LOG_ERROR, "stride (%d) is invalid for packet sized %d\n", |
68 | stride, avpkt->size); |
69 | return AVERROR_INVALIDDATA; |
70 | } |
71 | |
72 | frame->interlaced_frame = ((avctx->extradata[3*4] & 3) != 3); |
73 | if (frame->interlaced_frame) |
74 | frame->top_field_first = avctx->extradata[3*4] & 1; |
75 | |
76 | for (y = 0; y < avctx->height; y++) { |
77 | int src_y = y; |
78 | if (frame->interlaced_frame) |
79 | src_y = ((y&1)^frame->top_field_first) ? y/2 : (y/2 + avctx->height/2); |
80 | if (bits == 8) { |
81 | uint8_t *line = frame->data[0] + y*frame->linesize[0]; |
82 | memcpy(line, buf + src_y*stride, 2*avctx->width); |
83 | } else { |
84 | int block; |
85 | uint16_t *luma = (uint16_t*)&frame->data[0][y*frame->linesize[0]]; |
86 | uint16_t *cb = (uint16_t*)&frame->data[1][y*frame->linesize[1]]; |
87 | uint16_t *cr = (uint16_t*)&frame->data[2][y*frame->linesize[2]]; |
88 | for (block = 0; 16*block < avctx->width; block ++) { |
89 | const uint8_t *buf_src = buf + src_y*stride + 40*block; |
90 | for (x = 0; x < 16 && x + 16*block < avctx->width; x++) { |
91 | int xd = x + 16*block; |
92 | if (x&1) { |
93 | luma [xd] = (4*buf_src[2*x + 0]) + ((buf_src[32 + (x>>1)]>>4)&3); |
94 | } else { |
95 | luma [xd] = (4*buf_src[2*x + 0]) + (buf_src[32 + (x>>1)] &3); |
96 | cb[xd>>1] = (4*buf_src[2*x + 1]) + ((buf_src[32 + (x>>1)]>>2)&3); |
97 | cr[xd>>1] = (4*buf_src[2*x + 3]) + (buf_src[32 + (x>>1)]>>6); |
98 | } |
99 | } |
100 | } |
101 | } |
102 | } |
103 | |
104 | *got_frame = 1; |
105 | return avpkt->size; |
106 | } |
107 | |
108 | AVCodec ff_m101_decoder = { |
109 | .name = "m101", |
110 | .long_name = NULL_IF_CONFIG_SMALL("Matrox Uncompressed SD"), |
111 | .type = AVMEDIA_TYPE_VIDEO, |
112 | .id = AV_CODEC_ID_M101, |
113 | .init = m101_decode_init, |
114 | .decode = m101_decode_frame, |
115 | .capabilities = AV_CODEC_CAP_DR1, |
116 | }; |
117 |