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Fix bugs in ram audio provider

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There was some magic bit operations to calculate the cache block offsets. This only works when both bytes_per_sample and channels are power of 2. Originally the format is assumed to be int16 mono, which satisfies this requirement. However in case we use original audio data, the channels can be something not a power of 2 (e.g. for 5.1 channel audio the number of channels is 6). This will break the calculation. We rewrite the calculation, without using those bit operations.
This commit is contained in:
wangqr 2019-11-02 02:26:36 -04:00
parent 56434c5f58
commit 71894fd769
2 changed files with 6 additions and 4 deletions
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8
libaegisub/audio/provider_ram.cpp
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@ -77,9 +77,11 @@ void RAMAudioProvider::FillBuffer(void *buf, int64_t start, int64_t count) const
break;
}
const size_t i = (start * bytes_per_sample * channels) >> CacheBits;
const int start_offset = (start * bytes_per_sample * channels) & (CacheBlockSize-1);
const int read_size = std::min<int>(bytes_remaining, CacheBlockSize - start_offset);
const int64_t samples_per_block = CacheBlockSize / bytes_per_sample / channels;
const size_t i = start / samples_per_block;
const int start_offset = (start % samples_per_block) * bytes_per_sample * channels;
const int read_size = std::min<int>(bytes_remaining, samples_per_block * bytes_per_sample * channels - start_offset);
memcpy(charbuf, &blockcache[i][start_offset], read_size);
charbuf += read_size;

2
src/audio_player_xaudio2.cpp
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@ -472,7 +472,7 @@ XAudio2Thread::XAudio2Thread(agi::AudioProvider* provider, int WantedLatency, in
, is_playing(CreateEvent(0, TRUE, FALSE, 0))
, error_happened(CreateEvent(0, FALSE, FALSE, 0))
, wanted_latency(WantedLatency)
, buffer_length(BufferLength)
, buffer_length(BufferLength < XAUDIO2_MAX_QUEUED_BUFFERS ? BufferLength : XAUDIO2_MAX_QUEUED_BUFFERS)
, provider(provider)
, buffer_occupied(BufferLength)
{