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comparison foosdk/sdk/foobar2000/helpers/input_fix_seeking.h @ 1:20d02a178406 default tip

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*: check in everything else yay
author Paper <paper@tflc.us>
date Mon, 05 Jan 2026 02:15:46 -0500
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0:e9bb126753e7 1:20d02a178406
1 #pragma once
2
3 #include "duration_counter.h"
4
5 // Wrapper to implement input_flag_allow_inaccurate_seeking semantics with decoders that do not implement seeking properly.
6 // If input_flag_allow_inaccurate_seeking is not specified, brute force seeking is used.
7 template<typename base_t>
8 class input_fix_seeking : public base_t {
9 public:
10 input_fix_seeking() : m_active() {}
11
12 void decode_initialize(unsigned p_flags,abort_callback & p_abort) {
13 base_t::decode_initialize( p_flags, p_abort );
14 m_active = ( p_flags & input_flag_allow_inaccurate_seeking ) == 0;
15 m_position = 0;
16 m_decodeFrom = 0;
17 }
18
19 void decode_initialize(t_uint32 p_subsong,unsigned p_flags,abort_callback & p_abort) {
20 base_t::decode_initialize( p_subsong, p_flags, p_abort );
21 m_active = ( p_flags & input_flag_allow_inaccurate_seeking ) == 0;
22 m_position = 0;
23 }
24
25 bool decode_run(audio_chunk & p_chunk,abort_callback & p_abort) {
26 if ( ! m_active ) {
27 return base_t::decode_run ( p_chunk, p_abort );
28 }
29 for ( ;; ) {
30 p_abort.check();
31 if (! base_t::decode_run( p_chunk, p_abort ) ) return false;
32
33 double p = m_position.query();
34 m_position += p_chunk;
35 if ( m_decodeFrom > p ) {
36 auto skip = audio_math::time_to_samples( m_decodeFrom - p, p_chunk.get_sample_rate() );
37 if ( skip >= p_chunk.get_sample_count() ) continue;
38 if ( skip > 0 ) {
39 p_chunk.skip_first_samples( (size_t) skip );
40 }
41 }
42 return true;
43 }
44 }
45
46 void decode_seek(double p_seconds,abort_callback & p_abort) {
47 if ( m_active ) {
48 if ( ! this->decode_can_seek() ) throw exception_io_object_not_seekable();
49 m_decodeFrom = p_seconds;
50 if ( m_decodeFrom < m_position.query() ) {
51 base_t::decode_seek(0, p_abort); m_position.reset();
52 }
53 } else {
54 base_t::decode_seek(p_seconds, p_abort);
55 }
56 }
57
58 bool decode_run_raw(audio_chunk & p_chunk, mem_block_container & p_raw, abort_callback & p_abort) {
59 throw pfc::exception_not_implemented(); // shitformats that need this class are not likely to care
60 }
61 private:
62 bool m_active;
63 duration_counter m_position;
64 double m_decodeFrom;
65 };