1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
// Copyright (C) 2018-2020 Sebastian Dröge <sebastian@centricular.com>
// Copyright (C) 2020 Andrew Eikum <aeikum@codeweavers.com> for CodeWeavers
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

use std::fmt;
#[cfg(any(feature = "v1_16", feature = "dox"))]
use std::ptr;
#[cfg(any(feature = "v1_16", feature = "dox"))]
use std::slice;

use glib;
use glib::translate::{from_glib, ToGlib};
#[cfg(any(feature = "v1_16", feature = "dox"))]
use glib::translate::{from_glib_none, ToGlibPtr};
use gst;
use gst::prelude::*;
use gst_audio_sys;

#[repr(transparent)]
pub struct AudioClippingMeta(gst_audio_sys::GstAudioClippingMeta);

unsafe impl Send for AudioClippingMeta {}
unsafe impl Sync for AudioClippingMeta {}

impl AudioClippingMeta {
    pub fn add<V: Into<gst::GenericFormattedValue>>(
        buffer: &mut gst::BufferRef,
        start: V,
        end: V,
    ) -> gst::MetaRefMut<Self, gst::meta::Standalone> {
        skip_assert_initialized!();
        let start = start.into();
        let end = end.into();
        assert_eq!(start.get_format(), end.get_format());
        unsafe {
            let meta = gst_audio_sys::gst_buffer_add_audio_clipping_meta(
                buffer.as_mut_ptr(),
                start.get_format().to_glib(),
                start.get_value() as u64,
                end.get_value() as u64,
            );

            Self::from_mut_ptr(buffer, meta)
        }
    }

    pub fn get_start(&self) -> gst::GenericFormattedValue {
        gst::GenericFormattedValue::new(from_glib(self.0.format), self.0.start as i64)
    }

    pub fn get_end(&self) -> gst::GenericFormattedValue {
        gst::GenericFormattedValue::new(from_glib(self.0.format), self.0.end as i64)
    }
}

unsafe impl MetaAPI for AudioClippingMeta {
    type GstType = gst_audio_sys::GstAudioClippingMeta;

    fn get_meta_api() -> glib::Type {
        unsafe { from_glib(gst_audio_sys::gst_audio_clipping_meta_api_get_type()) }
    }
}

impl fmt::Debug for AudioClippingMeta {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        f.debug_struct("AudioClippingMeta")
            .field("start", &self.get_start())
            .field("end", &self.get_end())
            .finish()
    }
}

#[cfg(any(feature = "v1_16", feature = "dox"))]
#[repr(transparent)]
pub struct AudioMeta(gst_audio_sys::GstAudioMeta);

#[cfg(any(feature = "v1_16", feature = "dox"))]
unsafe impl Send for AudioMeta {}
#[cfg(any(feature = "v1_16", feature = "dox"))]
unsafe impl Sync for AudioMeta {}

#[cfg(any(feature = "v1_16", feature = "dox"))]
impl AudioMeta {
    pub fn add<'a>(
        buffer: &'a mut gst::BufferRef,
        info: &::AudioInfo,
        samples: usize,
        offsets: &[usize],
    ) -> Result<gst::MetaRefMut<'a, Self, gst::meta::Standalone>, glib::BoolError> {
        skip_assert_initialized!();

        if !info.is_valid() {
            return Err(glib_bool_error!("Invalid audio info"));
        }

        if info.rate() == 0
            || info.channels() == 0
            || info.format() == ::AudioFormat::Unknown
            || info.format() == ::AudioFormat::Encoded
        {
            return Err(glib_bool_error!("Unsupported audio format {:?}", info));
        }

        if !offsets.is_empty() && info.layout() != ::AudioLayout::NonInterleaved {
            return Err(glib_bool_error!(
                "Channel offsets only supported for non-interleaved audio"
            ));
        }

        if !offsets.is_empty() && offsets.len() != info.channels() as usize {
            return Err(glib_bool_error!(
                "Number of channel offsets different than number of channels ({} != {})",
                offsets.len(),
                info.channels()
            ));
        }

        if info.layout() == ::AudioLayout::NonInterleaved {
            let plane_size = samples * (info.width() / 8) as usize;
            let max_offset = if offsets.is_empty() {
                plane_size * (info.channels() - 1) as usize
            } else {
                let mut max_offset = None;

                for (i, offset) in offsets.iter().copied().enumerate() {
                    if let Some(current_max_offset) = max_offset {
                        max_offset = Some(std::cmp::max(current_max_offset, offset));
                    } else {
                        max_offset = Some(offset);
                    }

                    for (j, other_offset) in offsets.iter().copied().enumerate() {
                        if i != j
                            && !(other_offset + plane_size <= offset
                                || offset + plane_size <= other_offset)
                        {
                            return Err(glib_bool_error!("Overlapping audio channel offsets: offset {} for channel {} and offset {} for channel {} with a plane size of {}", offset, i, other_offset, j, plane_size));
                        }
                    }
                }

                max_offset.unwrap()
            };

            if max_offset + plane_size > buffer.get_size() {
                return Err(glib_bool_error!("Audio channel offsets out of bounds: max offset {} with plane size {} and buffer size {}", max_offset, plane_size, buffer.get_size()));
            }
        }

        unsafe {
            let meta = gst_audio_sys::gst_buffer_add_audio_meta(
                buffer.as_mut_ptr(),
                info.to_glib_none().0,
                samples,
                if offsets.is_empty() {
                    ptr::null_mut()
                } else {
                    offsets.as_ptr() as *mut _
                },
            );

            if meta.is_null() {
                return Err(glib_bool_error!("Failed to add audio meta"));
            }

            Ok(Self::from_mut_ptr(buffer, meta))
        }
    }

    pub fn get_info(&self) -> ::AudioInfo {
        unsafe { from_glib_none(&self.0.info as *const _ as *mut gst_audio_sys::GstAudioInfo) }
    }

    pub fn get_samples(&self) -> usize {
        self.0.samples
    }

    pub fn get_offsets(&self) -> &[usize] {
        if self.0.offsets.is_null() || self.0.info.channels < 1 {
            return &[];
        }

        unsafe { slice::from_raw_parts(self.0.offsets, self.0.info.channels as usize) }
    }
}

#[cfg(any(feature = "v1_16", feature = "dox"))]
unsafe impl MetaAPI for AudioMeta {
    type GstType = gst_audio_sys::GstAudioMeta;

    fn get_meta_api() -> glib::Type {
        unsafe { from_glib(gst_audio_sys::gst_audio_meta_api_get_type()) }
    }
}

#[cfg(any(feature = "v1_16", feature = "dox"))]
impl fmt::Debug for AudioMeta {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        f.debug_struct("AudioMeta")
            .field("info", &self.get_info())
            .field("samples", &self.get_samples())
            .field("offsets", &self.get_offsets())
            .finish()
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_add_get_meta() {
        use std::convert::TryInto;

        gst::init().unwrap();

        let mut buffer = gst::Buffer::with_size(1024).unwrap();

        {
            let cmeta = AudioClippingMeta::add(
                buffer.get_mut().unwrap(),
                gst::format::Default(Some(1)),
                gst::format::Default(Some(2)),
            );
            assert_eq!(
                cmeta.get_start().try_into(),
                Ok(gst::format::Default(Some(1)))
            );
            assert_eq!(
                cmeta.get_end().try_into(),
                Ok(gst::format::Default(Some(2)))
            );
        }

        {
            let cmeta = buffer.get_meta::<AudioClippingMeta>().unwrap();
            assert_eq!(
                cmeta.get_start().try_into(),
                Ok(gst::format::Default(Some(1)))
            );
            assert_eq!(
                cmeta.get_end().try_into(),
                Ok(gst::format::Default(Some(2)))
            );
        }
    }
}