FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/m101.c
Date: 2024-04-20 14:10:07
Exec Total Coverage
Lines: 0 50 0.0%
Functions: 0 2 0.0%
Branches: 0 34 0.0%

Line Branch Exec Source
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 "codec_internal.h"
25 #include "decode.h"
26
27
28 static av_cold int m101_decode_init(AVCodecContext *avctx)
29 {
30 if (avctx->extradata_size < 6*4) {
31 avpriv_request_sample(avctx, "Missing or too small extradata (size %d)", avctx->extradata_size);
32 return AVERROR_INVALIDDATA;
33 }
34
35 if (avctx->extradata[2*4] == 10)
36 avctx->pix_fmt = AV_PIX_FMT_YUV422P10;
37 else if (avctx->extradata[2*4] == 8) {
38 avctx->pix_fmt = AV_PIX_FMT_YUYV422;
39 } else {
40 avpriv_request_sample(avctx, "BPS %d", avctx->extradata[2*4]);
41 return AVERROR_INVALIDDATA;
42 }
43
44 return 0;
45 }
46
47 static int m101_decode_frame(AVCodecContext *avctx, AVFrame *frame,
48 int *got_frame, AVPacket *avpkt)
49 {
50 const uint8_t *buf = avpkt->data;
51 int stride, ret;
52 int x, y;
53 int min_stride = 2 * avctx->width;
54 int bits = avctx->extradata[2*4];
55
56 stride = AV_RL32(avctx->extradata + 5*4);
57
58 if (avctx->pix_fmt == AV_PIX_FMT_YUV422P10)
59 min_stride = (avctx->width + 15) / 16 * 40;
60
61 if (stride < min_stride || avpkt->size < stride * (uint64_t)avctx->height) {
62 av_log(avctx, AV_LOG_ERROR, "stride (%d) is invalid for packet sized %d\n",
63 stride, avpkt->size);
64 return AVERROR_INVALIDDATA;
65 }
66
67 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
68 return ret;
69 frame->pict_type = AV_PICTURE_TYPE_I;
70 frame->flags |= AV_FRAME_FLAG_KEY;
71 if ((avctx->extradata[3*4] & 3) != 3) {
72 frame->flags |= AV_FRAME_FLAG_INTERLACED;
73 if (avctx->extradata[3*4] & 1)
74 frame->flags |= AV_FRAME_FLAG_TOP_FIELD_FIRST;
75 }
76
77 for (y = 0; y < avctx->height; y++) {
78 int src_y = y;
79 if (frame->flags & AV_FRAME_FLAG_INTERLACED)
80 src_y = ((y&1) ^ !!(frame->flags & AV_FRAME_FLAG_TOP_FIELD_FIRST)) ? y/2 : (y/2 + avctx->height/2);
81 if (bits == 8) {
82 uint8_t *line = frame->data[0] + y*frame->linesize[0];
83 memcpy(line, buf + src_y*stride, 2*avctx->width);
84 } else {
85 int block;
86 uint16_t *luma = (uint16_t*)&frame->data[0][y*frame->linesize[0]];
87 uint16_t *cb = (uint16_t*)&frame->data[1][y*frame->linesize[1]];
88 uint16_t *cr = (uint16_t*)&frame->data[2][y*frame->linesize[2]];
89 for (block = 0; 16*block < avctx->width; block ++) {
90 const uint8_t *buf_src = buf + src_y*stride + 40*block;
91 for (x = 0; x < 16 && x + 16*block < avctx->width; x++) {
92 int xd = x + 16*block;
93 if (x&1) {
94 luma [xd] = (4*buf_src[2*x + 0]) + ((buf_src[32 + (x>>1)]>>4)&3);
95 } else {
96 luma [xd] = (4*buf_src[2*x + 0]) + (buf_src[32 + (x>>1)] &3);
97 cb[xd>>1] = (4*buf_src[2*x + 1]) + ((buf_src[32 + (x>>1)]>>2)&3);
98 cr[xd>>1] = (4*buf_src[2*x + 3]) + (buf_src[32 + (x>>1)]>>6);
99 }
100 }
101 }
102 }
103 }
104
105 *got_frame = 1;
106 return avpkt->size;
107 }
108
109 const FFCodec ff_m101_decoder = {
110 .p.name = "m101",
111 CODEC_LONG_NAME("Matrox Uncompressed SD"),
112 .p.type = AVMEDIA_TYPE_VIDEO,
113 .p.id = AV_CODEC_ID_M101,
114 .init = m101_decode_init,
115 FF_CODEC_DECODE_CB(m101_decode_frame),
116 .p.capabilities = AV_CODEC_CAP_DR1,
117 };
118