FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavformat/mvi.c
Date: 2022-11-26 13:19:19
Exec Total Coverage
Lines: 59 73 80.8%
Branches: 18 34 52.9%

Line Branch Exec Source
1 /*
2 * Motion Pixels MVI Demuxer
3 * Copyright (c) 2008 Gregory Montoir (cyx@users.sourceforge.net)
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 <inttypes.h>
23
24 #include "libavutil/channel_layout.h"
25 #include "avformat.h"
26 #include "internal.h"
27
28 #define MVI_FRAC_BITS 10
29
30 #define MVI_AUDIO_STREAM_INDEX 0
31 #define MVI_VIDEO_STREAM_INDEX 1
32
33 typedef struct MviDemuxContext {
34 unsigned int (*get_int)(AVIOContext *);
35 uint64_t audio_size_counter;
36 uint64_t audio_frame_size;
37 int audio_size_left;
38 int video_frame_size;
39 } MviDemuxContext;
40
41 1 static int read_header(AVFormatContext *s)
42 {
43 1 MviDemuxContext *mvi = s->priv_data;
44 1 AVIOContext *pb = s->pb;
45 AVStream *ast, *vst;
46 unsigned int version, frames_count, msecs_per_frame, player_version;
47 int ret;
48 int audio_data_size;
49
50 1 ast = avformat_new_stream(s, NULL);
51
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1 if (!ast)
52 return AVERROR(ENOMEM);
53
54 1 vst = avformat_new_stream(s, NULL);
55
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1 if (!vst)
56 return AVERROR(ENOMEM);
57
58
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1 if ((ret = ff_alloc_extradata(vst->codecpar, 2)) < 0)
59 return ret;
60
61 1 version = avio_r8(pb);
62 1 vst->codecpar->extradata[0] = avio_r8(pb);
63 1 vst->codecpar->extradata[1] = avio_r8(pb);
64 1 frames_count = avio_rl32(pb);
65 1 msecs_per_frame = avio_rl32(pb);
66 1 vst->codecpar->width = avio_rl16(pb);
67 1 vst->codecpar->height = avio_rl16(pb);
68 1 avio_r8(pb);
69 1 ast->codecpar->sample_rate = avio_rl16(pb);
70 1 audio_data_size = avio_rl32(pb);
71 1 avio_r8(pb);
72 1 player_version = avio_rl32(pb);
73 1 avio_rl16(pb);
74 1 avio_r8(pb);
75
76
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1 if (frames_count == 0 || audio_data_size <= 0)
77 return AVERROR_INVALIDDATA;
78
79
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1 if (version != 7 || player_version > 213) {
80 av_log(s, AV_LOG_ERROR, "unhandled version (%d,%d)\n", version, player_version);
81 return AVERROR_INVALIDDATA;
82 }
83
84 1 avpriv_set_pts_info(ast, 64, 1, ast->codecpar->sample_rate);
85 1 ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
86 1 ast->codecpar->codec_id = AV_CODEC_ID_PCM_U8;
87 1 ast->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
88 1 ast->codecpar->bits_per_coded_sample = 8;
89 1 ast->codecpar->bit_rate = ast->codecpar->sample_rate * 8;
90
91 1 avpriv_set_pts_info(vst, 64, msecs_per_frame, 1000000);
92 1 vst->avg_frame_rate = av_inv_q(vst->time_base);
93 1 vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
94 1 vst->codecpar->codec_id = AV_CODEC_ID_MOTIONPIXELS;
95
96
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1 mvi->get_int = (vst->codecpar->width * (int64_t)vst->codecpar->height < (1 << 16)) ? avio_rl16 : avio_rl24;
97
98 1 mvi->audio_frame_size = ((uint64_t)audio_data_size << MVI_FRAC_BITS) / frames_count;
99
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1 if (mvi->audio_frame_size <= 1 << MVI_FRAC_BITS - 1) {
100 av_log(s, AV_LOG_ERROR,
101 "Invalid audio_data_size (%d) or frames_count (%u)\n",
102 audio_data_size, frames_count);
103 return AVERROR_INVALIDDATA;
104 }
105
106 1 mvi->audio_size_counter = (ast->codecpar->sample_rate * 830 / mvi->audio_frame_size - 1) * mvi->audio_frame_size;
107 1 mvi->audio_size_left = audio_data_size;
108
109 1 return 0;
110 }
111
112 224 static int read_packet(AVFormatContext *s, AVPacket *pkt)
113 {
114 int ret, count;
115 224 MviDemuxContext *mvi = s->priv_data;
116 224 AVIOContext *pb = s->pb;
117
118
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224 if (mvi->video_frame_size == 0) {
119 112 mvi->video_frame_size = (mvi->get_int)(pb);
120
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112 if (mvi->audio_size_left == 0)
121 return AVERROR(EIO);
122
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112 if (mvi->audio_size_counter + 512 > UINT64_MAX - mvi->audio_frame_size ||
123
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112 mvi->audio_size_counter + 512 + mvi->audio_frame_size >= ((uint64_t)INT32_MAX) << MVI_FRAC_BITS)
124 return AVERROR_INVALIDDATA;
125
126 112 count = (mvi->audio_size_counter + mvi->audio_frame_size + 512) >> MVI_FRAC_BITS;
127
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112 if (count > mvi->audio_size_left)
128 count = mvi->audio_size_left;
129
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112 if ((int64_t)count << MVI_FRAC_BITS > INT_MAX)
130 return AVERROR_INVALIDDATA;
131
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112 if ((ret = av_get_packet(pb, pkt, count)) < 0)
132 return ret;
133 112 pkt->stream_index = MVI_AUDIO_STREAM_INDEX;
134 112 mvi->audio_size_left -= count;
135 112 mvi->audio_size_counter += mvi->audio_frame_size - (count << MVI_FRAC_BITS);
136 } else {
137
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112 if ((ret = av_get_packet(pb, pkt, mvi->video_frame_size)) < 0)
138 return ret;
139 112 pkt->stream_index = MVI_VIDEO_STREAM_INDEX;
140 112 mvi->video_frame_size = 0;
141 }
142 224 return 0;
143 }
144
145 const AVInputFormat ff_mvi_demuxer = {
146 .name = "mvi",
147 .long_name = NULL_IF_CONFIG_SMALL("Motion Pixels MVI"),
148 .priv_data_size = sizeof(MviDemuxContext),
149 .read_header = read_header,
150 .read_packet = read_packet,
151 .extensions = "mvi",
152 };
153