Mercurial > vxvideo

annotate src/main.rs @ 1:4adea0a8c8dd

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Remove all unwraps.
author Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
date Thu, 19 Nov 2020 21:36:00 +0100
parents 57b200fad67e
children 1a2852861d8b
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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0
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1 use std::num::ParseIntError;
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2 use std::str::FromStr;
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3 use std::fmt;
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4 use std::fs::File;
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5 use std::io::{Read, BufReader, Seek, SeekFrom, Write, BufWriter};
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6 use std::error::Error;
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7 use std::env;
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8 use std::process;
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9
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10 #[derive(Debug)]
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11 pub enum ParseError {
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12 Int(ParseIntError),
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13 WrongResolution,
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14 UnknownCodec,
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15 Custom(String),
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16 }
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17
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18 impl fmt::Display for ParseError {
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19 fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
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20 write!(fmt, "{}", self)
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21 }
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22 }
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23
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24 impl Error for ParseError {}
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25
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26 impl From<ParseIntError> for ParseError {
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27 fn from(e: ParseIntError) -> ParseError {
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28 ParseError::Int(e)
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29 }
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30 }
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31
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32 #[derive(Debug)]
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33 enum Codec {
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34 H264,
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35 }
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36
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37 impl FromStr for Codec {
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38 type Err = ParseError;
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39
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40 fn from_str(s: &str) -> Result<Codec, ParseError> {
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41 if s == "H.264" {
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42 Ok(Codec::H264)
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43 } else {
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44 Err(ParseError::UnknownCodec)
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45 }
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46 }
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47 }
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48
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49 #[derive(Debug, PartialEq)]
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50 struct Resolution {
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51 width: u16,
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52 height: u16,
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53 }
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54
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55 impl FromStr for Resolution {
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56 type Err = ParseError;
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57
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58 fn from_str(s: &str) -> Result<Resolution, ParseError> {
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59 let values: Vec<_> = s.split('x').collect();
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60 if let [width, height] = values.as_slice() {
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61 let width = width.parse()?;
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62 let height = height.parse()?;
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63 Ok(Resolution {
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64 width,
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65 height,
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66 })
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67 } else {
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68 Err(ParseError::WrongResolution)
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69 }
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70 }
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71 }
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72
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73 impl fmt::Display for Resolution {
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74 fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
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75 write!(fmt, "{}×{}", self.width, self.height)
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76 }
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77 }
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78
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79 #[derive(Debug)]
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80 pub struct VxSeekLine {
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81 timestamp: u64,
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82 video_name: String,
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83 codec: Codec,
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84 resolution: Resolution,
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85 unknown: u8,
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86 length: u32,
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87 }
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88
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89 pub fn parse_vxseek(vxseek: &str) -> Result<Vec<VxSeekLine>, ParseError> {
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90 let mut content = Vec::new();
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91 for line in vxseek.lines() {
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92 let fields: Vec<_> = line.split(':').collect();
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93 match fields.as_slice() {
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94 [timestamp, video_name, codec, resolution, unknown, length] => {
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95 let timestamp = timestamp.parse()?;
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96 let video_name = video_name.to_string();
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97 let codec = codec.parse()?;
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98 let resolution = resolution.parse()?;
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99 let unknown = unknown.parse()?;
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100 let length = length.parse()?;
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101 content.push(VxSeekLine {
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102 timestamp,
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103 video_name,
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104 codec,
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105 resolution,
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106 unknown,
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107 length,
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108 });
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109 }
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110 _ => return Err(ParseError::Custom(String::from("Invalid line in vxseek"))),
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111 }
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112 }
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113 Ok(content)
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114 }
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115
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116 fn main() -> Result<(), Box<dyn Error>> {
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117 let args: Vec<_> = env::args().collect();
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118 if args.len() != 5 {
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119 eprintln!("Usage: {} <input.vxseek> <input.vxvideo> <resolution> <output.h264>", args[0]);
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120 process::exit(1);
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121 }
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122 let vxseek_filename = &args[1];
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123 let vxvideo_filename = &args[2];
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124 let wanted_resolution: Resolution = args[3].parse()?;
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125 let output_filename = &args[4];
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126
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127 let vxseek = {
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128 let mut vxseek = File::open(vxseek_filename)?;
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129 let mut contents = String::new();
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130 vxseek.read_to_string(&mut contents)?;
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131 parse_vxseek(&contents)?
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132 };
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133 {
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134 let vxvideo = File::open(vxvideo_filename)?;
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135 let mut vxvideo = BufReader::new(vxvideo);
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136
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137 let output = File::create(output_filename)?;
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138 let mut output = BufWriter::new(output);
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139
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140 let mut name: Option<String> = None;
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141 for VxSeekLine { timestamp, video_name, codec, resolution, unknown, length } in vxseek {
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142 if let Some(ref name) = &name {
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143 if &video_name != name {
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144 vxvideo.seek(SeekFrom::Current(length as i64))?;
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145 continue;
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146 }
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147 } else {
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148 if resolution != wanted_resolution {
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149 println!("Skipping {} due to resolution {}", video_name, resolution);
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150 vxvideo.seek(SeekFrom::Current(length as i64))?;
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151 continue;
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152 }
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153 name = Some(video_name);
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154 }
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155 let mut buf = Vec::with_capacity(length as usize);
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156 unsafe { buf.set_len(length as usize) };
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157 vxvideo.read_exact(&mut buf)?;
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158 output.write_all(&buf)?;
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159 output.flush()?;
0
57b200fad67e Hello world!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
160 }
57b200fad67e Hello world!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
161 }
57b200fad67e Hello world!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
162 Ok(())
57b200fad67e Hello world!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
163 }