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[APU] XMA: Fix audio loop handling. 

Handles audio loop if loop_start < loop_end.
Need to handle additional cases like loop_start > loop_end.
This commit is contained in:
Pseudo-Kernel 2022-01-29 17:49:00 +09:00 committed by GitHub
parent 1d51b574ec
commit 372bdd3ec9
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 54 additions and 4 deletions
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56
src/xenia/apu/xma_context.cc
View File

@ -177,6 +177,25 @@ void XmaContext::SwapInputBuffer(XMA_CONTEXT_DATA* data) {
data->input_buffer_read_offset = 0;
}
bool XmaContext::TrySetupNextLoop(XMA_CONTEXT_DATA* data,
bool ignore_input_buffer_offset) {
// Setup the input buffer offset if next loop exists.
// TODO(Pseudo-Kernel): Need to handle loop in the following cases.
// 1. loop_start == loop_end == 0
// 2. loop_start > loop_end && loop_count > 0
if (data->loop_count > 0 && data->loop_start < data->loop_end &&
(ignore_input_buffer_offset ||
data->input_buffer_read_offset >= data->loop_end)) {
// Loop back to the beginning.
data->input_buffer_read_offset = data->loop_start;
if (data->loop_count < 255) {
data->loop_count--;
}
return true;
}
return false;
}
/*
void XmaContext::NextPacket(
uint8_t* input_buffer,
@ -364,6 +383,7 @@ void XmaContext::Decode(XMA_CONTEXT_DATA* data) {
assert_false(data->stop_when_done);
assert_false(data->interrupt_when_done);
static int total_samples = 0;
bool reuse_input_buffer = false;
// Decode until we can't write any more data.
while (output_remaining_bytes > 0) {
if (!data->input_buffer_0_valid && !data->input_buffer_1_valid) {
@ -371,6 +391,10 @@ void XmaContext::Decode(XMA_CONTEXT_DATA* data) {
break;
}
// Setup the input buffer if we are at loop_end.
// The input buffer must not be swapped out until all loops are processed.
reuse_input_buffer = TrySetupNextLoop(data, false);
// assert_true(packets_skip_ == 0);
// assert_true(split_frame_len_ == 0);
// assert_true(split_frame_len_partial_ == 0);
@ -392,7 +416,13 @@ void XmaContext::Decode(XMA_CONTEXT_DATA* data) {
packets_skip_--;
packet_idx++;
if (packet_idx >= current_input_packet_count) {
SwapInputBuffer(data);
if (!reuse_input_buffer) {
// Last packet. Try setup once more.
reuse_input_buffer = TrySetupNextLoop(data, true);
}
if (!reuse_input_buffer) {
SwapInputBuffer(data);
}
return;
}
}
@ -524,7 +554,13 @@ void XmaContext::Decode(XMA_CONTEXT_DATA* data) {
packet += kBytesPerPacket;
packet_idx++;
if (packet_idx >= current_input_packet_count) {
SwapInputBuffer(data);
if (!reuse_input_buffer) {
// Last packet. Try setup once more.
reuse_input_buffer = TrySetupNextLoop(data, true);
}
if (!reuse_input_buffer) {
SwapInputBuffer(data);
}
return;
}
}
@ -606,7 +642,13 @@ void XmaContext::Decode(XMA_CONTEXT_DATA* data) {
packets_skip_--;
packet_idx++;
if (packet_idx >= current_input_packet_count) {
SwapInputBuffer(data);
if (!reuse_input_buffer) {
// Last packet. Try setup once more.
reuse_input_buffer = TrySetupNextLoop(data, true);
}
if (!reuse_input_buffer) {
SwapInputBuffer(data);
}
return;
}
}
@ -618,7 +660,13 @@ void XmaContext::Decode(XMA_CONTEXT_DATA* data) {
// Next packet but we already skipped to it
if (packet_idx >= current_input_packet_count) {
// Buffer is fully used
SwapInputBuffer(data);
if (!reuse_input_buffer) {
// Last packet. Try setup once more.
reuse_input_buffer = TrySetupNextLoop(data, true);
}
if (!reuse_input_buffer) {
SwapInputBuffer(data);
}
break;
}
offset =

2
src/xenia/apu/xma_context.h
View File

@ -171,6 +171,8 @@ class XmaContext {
private:
static void SwapInputBuffer(XMA_CONTEXT_DATA* data);
static bool TrySetupNextLoop(XMA_CONTEXT_DATA* data,
bool ignore_input_buffer_offset);
static void NextPacket(XMA_CONTEXT_DATA* data);
static int GetSampleRate(int id);
// Get the offset of the next frame. Does not traverse packets.