FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/flvdec.c
Date: 2025-11-10 16:28:23
Exec Total Coverage
Lines: 33 62 53.2%
Functions: 1 1 100.0%
Branches: 11 26 42.3%
Line Branch Exec Source
1 /*
2 * FLV decoding.
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/imgutils.h"
22
23 #include "codec_internal.h"
24 #include "flvdec.h"
25 #include "h263dec.h"
26 #include "mpegvideo.h"
27 #include "mpegvideodec.h"
28
29 315 int ff_flv_decode_picture_header(H263DecContext *const h)
30 {
31 int format, width, height;
32
33 /* picture header */
34
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 315 if (get_bits(&h->gb, 17) != 1) {
35 ✗ av_log(h->c.avctx, AV_LOG_ERROR, "Bad picture start code\n");
36 ✗ return AVERROR_INVALIDDATA;
37 }
38 315 format = get_bits(&h->gb, 5);
39
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 315 if (format != 0 && format != 1) {
40 ✗ av_log(h->c.avctx, AV_LOG_ERROR, "Bad picture format\n");
41 ✗ return AVERROR_INVALIDDATA;
42 }
43 315 h->flv = format;
44 315 h->picture_number = get_bits(&h->gb, 8); /* picture timestamp */
45 315 format = get_bits(&h->gb, 3);
46
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 315 switch (format) {
47 51 case 0:
48 51 width = get_bits(&h->gb, 8);
49 51 height = get_bits(&h->gb, 8);
50 51 break;
51 ✗ case 1:
52 ✗ width = get_bits(&h->gb, 16);
53 ✗ height = get_bits(&h->gb, 16);
54 ✗ break;
55 262 case 2:
56 262 width = 352;
57 262 height = 288;
58 262 break;
59 ✗ case 3:
60 ✗ width = 176;
61 ✗ height = 144;
62 ✗ break;
63 ✗ case 4:
64 ✗ width = 128;
65 ✗ height = 96;
66 ✗ break;
67 2 case 5:
68 2 width = 320;
69 2 height = 240;
70 2 break;
71 ✗ case 6:
72 ✗ width = 160;
73 ✗ height = 120;
74 ✗ break;
75 ✗ default:
76 ✗ width = height = 0;
77 ✗ break;
78 }
79
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 315 if (av_image_check_size(width, height, 0, h->c.avctx))
80 ✗ return AVERROR(EINVAL);
81 315 h->c.width = width;
82 315 h->c.height = height;
83
84 315 h->c.pict_type = AV_PICTURE_TYPE_I + get_bits(&h->gb, 2);
85 315 h->c.droppable = h->c.pict_type > AV_PICTURE_TYPE_P;
86
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 315 if (h->c.droppable)
87 ✗ h->c.pict_type = AV_PICTURE_TYPE_P;
88
89 315 skip_bits1(&h->gb); /* deblocking flag */
90 315 h->c.chroma_qscale = h->c.qscale = get_bits(&h->gb, 5);
91
92 315 h->h263_long_vectors = 0;
93
94 /* PEI */
95
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 315 if (skip_1stop_8data_bits(&h->gb) < 0)
96 ✗ return AVERROR_INVALIDDATA;
97
98
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 315 if (h->ehc_mode)
99 ✗ h->c.avctx->sample_aspect_ratio= (AVRational){1,2};
100
101
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 315 if (h->c.avctx->debug & FF_DEBUG_PICT_INFO) {
102 ✗ av_log(h->c.avctx, AV_LOG_DEBUG, "%c esc_type:%d, qp:%d num:%d\n",
103 ✗ h->c.droppable ? 'D' : av_get_picture_type_char(h->c.pict_type),
104 h->flv, h->c.qscale, h->picture_number);
105 }
106
107 315 return 0;
108 }
109
110 const FFCodec ff_flv_decoder = {
111 .p.name = "flv",
112 CODEC_LONG_NAME("FLV / Sorenson Spark / Sorenson H.263 (Flash Video)"),
113 .p.type = AVMEDIA_TYPE_VIDEO,
114 .p.id = AV_CODEC_ID_FLV1,
115 .priv_data_size = sizeof(H263DecContext),
116 .init = ff_h263_decode_init,
117 FF_CODEC_DECODE_CB(ff_h263_decode_frame),
118 .close = ff_mpv_decode_close,
119 .p.capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1,
120 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP |
121 FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
122 .p.max_lowres = 3,
123 };
124