FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/avrndec.c
Date: 2022-11-26 13:19:19
Exec Total Coverage
Lines: 27 35 77.1%
Branches: 9 18 50.0%

Line Branch Exec Source
1 /*
2 * AVRn decoder
3 * Copyright (c) 2012 Michael Niedermayer
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 #include "avcodec.h"
23 #include "codec_internal.h"
24 #include "decode.h"
25 #include "libavutil/imgutils.h"
26
27 typedef struct {
28 int interlace;
29 int tff;
30 } AVRnContext;
31
32 2 static av_cold int init(AVCodecContext *avctx)
33 {
34 2 AVRnContext *a = avctx->priv_data;
35 int ret;
36
37
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2 if ((ret = av_image_check_size(avctx->width, avctx->height, 0, avctx)) < 0)
38 return ret;
39
40 2 avctx->pix_fmt = AV_PIX_FMT_UYVY422;
41
42
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2 if(avctx->extradata_size >= 9 && avctx->extradata[4]+28 < avctx->extradata_size) {
43 2 int ndx = avctx->extradata[4] + 4;
44 2 a->interlace = !memcmp(avctx->extradata + ndx, "1:1(", 4);
45
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2 if(a->interlace) {
46 2 a->tff = avctx->extradata[ndx + 24] == 1;
47 }
48 }
49
50 2 return 0;
51 }
52
53 2 static int decode_frame(AVCodecContext *avctx, AVFrame *p,
54 int *got_frame, AVPacket *avpkt)
55 {
56 2 AVRnContext *a = avctx->priv_data;
57 2 const uint8_t *buf = avpkt->data;
58 2 int buf_size = avpkt->size;
59 int y, ret, true_height;
60
61 2 true_height = buf_size / (2*avctx->width);
62
63
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2 if(buf_size < 2*avctx->width * avctx->height) {
64 av_log(avctx, AV_LOG_ERROR, "packet too small\n");
65 return AVERROR_INVALIDDATA;
66 }
67
68
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2 if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
69 return ret;
70 2 p->pict_type= AV_PICTURE_TYPE_I;
71 2 p->key_frame= 1;
72
73
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2 if(a->interlace) {
74 2 buf += (true_height - avctx->height)*avctx->width;
75
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488 for(y = 0; y < avctx->height-1; y+=2) {
76 486 memcpy(p->data[0] + (y+ a->tff)*p->linesize[0], buf , 2*avctx->width);
77 486 memcpy(p->data[0] + (y+!a->tff)*p->linesize[0], buf + avctx->width*true_height+4, 2*avctx->width);
78 486 buf += 2*avctx->width;
79 }
80 } else {
81 buf += (true_height - avctx->height)*avctx->width*2;
82 for(y = 0; y < avctx->height; y++) {
83 memcpy(p->data[0] + y*p->linesize[0], buf, 2*avctx->width);
84 buf += 2*avctx->width;
85 }
86 }
87
88 2 *got_frame = 1;
89 2 return buf_size;
90 }
91
92 const FFCodec ff_avrn_decoder = {
93 .p.name = "avrn",
94 CODEC_LONG_NAME("Avid AVI Codec"),
95 .p.type = AVMEDIA_TYPE_VIDEO,
96 .p.id = AV_CODEC_ID_AVRN,
97 .priv_data_size = sizeof(AVRnContext),
98 .init = init,
99 FF_CODEC_DECODE_CB(decode_frame),
100 .p.capabilities = AV_CODEC_CAP_DR1,
101 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
102 };
103