From 578c3737f8c07e543b90f964da0e89db1c18bb9a Mon Sep 17 00:00:00 2001
From: jacqueline <me@jacqueline.id.au>
Date: Wed, 9 Aug 2023 11:22:08 +1000
Subject: Add vorbis support whilst we're here

---
 src/codecs/stbvorbis.cpp | 128 -----------------------------------------------
 1 file changed, 128 deletions(-)
 delete mode 100644 src/codecs/stbvorbis.cpp

(limited to 'src/codecs/stbvorbis.cpp')

diff --git a/src/codecs/stbvorbis.cpp b/src/codecs/stbvorbis.cpp
deleted file mode 100644
index de315416..00000000
--- a/src/codecs/stbvorbis.cpp
+++ /dev/null
@@ -1,128 +0,0 @@
-/*
- * Copyright 2023 jacqueline <me@jacqueline.id.au>
- *
- * SPDX-License-Identifier: GPL-3.0-only
- */
-
-#include "stbvorbis.hpp"
-#include <stdint.h>
-
-#include <cstdint>
-#include <optional>
-
-#include "stb_vorbis.h"
-
-namespace codecs {
-
-StbVorbisDecoder::StbVorbisDecoder()
-    : vorbis_(nullptr),
-      current_sample_(-1),
-      num_channels_(0),
-      num_samples_(0),
-      samples_array_(NULL) {}
-
-StbVorbisDecoder::~StbVorbisDecoder() {
-  if (vorbis_ != nullptr) {
-    stb_vorbis_close(vorbis_);
-  }
-}
-
-static uint32_t scaleToBits(float sample, uint8_t bits) {
-  // Scale to range.
-  int32_t max_val = (1 << (bits - 1));
-  int32_t fixed_point = sample * max_val;
-
-  // Clamp within bounds.
-  fixed_point = std::clamp(fixed_point, -max_val, max_val);
-
-  // Remove sign.
-  return *reinterpret_cast<uint32_t*>(&fixed_point);
-}
-
-auto StbVorbisDecoder::BeginStream(const cpp::span<const std::byte> input)
-    -> Result<OutputFormat> {
-  if (vorbis_ != nullptr) {
-    stb_vorbis_close(vorbis_);
-    vorbis_ = nullptr;
-  }
-  current_sample_ = -1;
-  int bytes_read = 0;
-  int error = 0;
-  vorbis_ =
-      stb_vorbis_open_pushdata(reinterpret_cast<const uint8_t*>(input.data()),
-                               input.size_bytes(), &bytes_read, &error, NULL);
-  if (error != 0) {
-    return {0, cpp::fail(Error::kMalformedData)};
-  }
-  stb_vorbis_info info = stb_vorbis_get_info(vorbis_);
-  return {bytes_read,
-          OutputFormat{.num_channels = static_cast<uint8_t>(info.channels),
-                       .bits_per_sample = 24,
-                       .sample_rate_hz = info.sample_rate}};
-}
-
-auto StbVorbisDecoder::ContinueStream(cpp::span<const std::byte> input,
-                                      cpp::span<std::byte> output)
-    -> Result<OutputInfo> {
-  std::size_t bytes_used = 0;
-  if (current_sample_ < 0) {
-    num_channels_ = 0;
-    num_samples_ = 0;
-    samples_array_ = NULL;
-
-    while (true) {
-      auto cropped = input.subspan(bytes_used);
-      std::size_t b = stb_vorbis_decode_frame_pushdata(
-          vorbis_, reinterpret_cast<const uint8_t*>(cropped.data()),
-          cropped.size_bytes(), &num_channels_, &samples_array_, &num_samples_);
-      if (b == 0) {
-        return {bytes_used, cpp::fail(Error::kOutOfInput)};
-      }
-      bytes_used += b;
-
-      if (num_samples_ == 0) {
-        // Decoder is synchronising. Decode more bytes.
-        continue;
-      }
-      if (num_channels_ == 0 || samples_array_ == NULL) {
-        // The decoder isn't satisfying its contract.
-        return {bytes_used, cpp::fail(Error::kInternalError)};
-      }
-      current_sample_ = 0;
-      break;
-    }
-  }
-
-  // We successfully decoded a frame. Time to write out the samples.
-  std::size_t output_byte = 0;
-  while (current_sample_ < num_samples_) {
-    if (output_byte + (2 * num_channels_) >= output.size()) {
-      return {0, OutputInfo{.bytes_written = output_byte,
-                            .is_finished_writing = false}};
-    }
-
-    for (int channel = 0; channel < num_channels_; channel++) {
-      float raw_sample = samples_array_[channel][current_sample_];
-
-      uint16_t sample_24 = scaleToBits(raw_sample, 24);
-      output[output_byte++] = static_cast<std::byte>((sample_24 >> 16) & 0xFF);
-      output[output_byte++] = static_cast<std::byte>((sample_24 >> 8) & 0xFF);
-      output[output_byte++] = static_cast<std::byte>((sample_24)&0xFF);
-      // Pad to 32 bits for alignment.
-      output[output_byte++] = static_cast<std::byte>(0);
-    }
-    current_sample_++;
-  }
-
-  current_sample_ = -1;
-  return {bytes_used, OutputInfo{.bytes_written = output_byte,
-                                 .is_finished_writing = true}};
-}
-
-auto StbVorbisDecoder::SeekStream(cpp::span<const std::byte> input,
-                                  std::size_t target_sample) -> Result<void> {
-  // TODO(jacqueline): Implement me.
-  return {0, {}};
-}
-
-}  // namespace codecs
-- 
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