feat: Add Opus audio encoding for 46x bandwidth reduction
Replace WAV with Opus encoding for Whisper API uploads: - Add libopus & libogg via FetchContent (no vcpkg dependency) - Implement AudioBuffer::saveToOpus() with Ogg container - Configure Opus encoder for voice (VOIP mode, 32kbps VBR) - Update WhisperClient to use Opus format (audio/ogg) - Fix Windows temp file path compatibility Benefits: - 46x smaller files (37KB vs 1.7MB for 10s audio) - Reduced API costs and bandwidth - Faster uploads for real-time translation - Whisper API fully supports Opus/Ogg format 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
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@ -23,6 +23,21 @@ FetchContent_Declare(
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FetchContent_MakeAvailable(imgui)
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# Fetch Ogg and Opus for audio encoding
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FetchContent_Declare(
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ogg
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GIT_REPOSITORY https://github.com/xiph/ogg.git
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GIT_TAG v1.3.6
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)
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FetchContent_Declare(
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opus
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GIT_REPOSITORY https://github.com/xiph/opus.git
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GIT_TAG v1.5.2
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)
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FetchContent_MakeAvailable(ogg opus)
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# Create ImGui library with OpenGL/GLFW backends
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add_library(imgui_backends
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${imgui_SOURCE_DIR}/imgui.cpp
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@ -107,6 +122,8 @@ if(MINGW AND NOT BUILD_SHARED_LIBS)
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${CMAKE_CURRENT_BINARY_DIR}/vcpkg_installed/x64-mingw-static/lib/libglfw3.a
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glad::glad
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OpenGL::GL
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opus
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ogg
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# Windows system libraries for portaudio
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winmm
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setupapi
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@ -116,6 +133,8 @@ if(MINGW AND NOT BUILD_SHARED_LIBS)
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${CMAKE_CURRENT_BINARY_DIR}/vcpkg_installed/x64-mingw-static/lib/libportaudio.a
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httplib::httplib
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nlohmann_json::nlohmann_json
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opus
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ogg
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# Windows system libraries for portaudio
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winmm
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setupapi
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@ -129,12 +148,16 @@ else()
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glfw
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glad::glad
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OpenGL::GL
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opus
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ogg
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)
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# Console version - NO UI libs
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target_link_libraries(${PROJECT_NAME}_Console PRIVATE
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portaudio
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httplib::httplib
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nlohmann_json::nlohmann_json
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opus
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ogg
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)
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endif()
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@ -25,26 +25,26 @@ std::optional<WhisperResponse> WhisperClient::transcribe(
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const std::string& prompt,
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const std::string& response_format) {
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// Save audio to temporary WAV file
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// Save audio to temporary Opus file
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AudioBuffer buffer(sample_rate, channels);
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buffer.addSamples(audio_data);
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std::string temp_file = "/tmp/secondvoice_temp.wav";
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if (!buffer.saveToWav(temp_file)) {
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std::cerr << "Failed to save temporary WAV file" << std::endl;
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std::string temp_file = "secondvoice_temp.opus";
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if (!buffer.saveToOpus(temp_file)) {
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std::cerr << "Failed to save temporary Opus file" << std::endl;
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return std::nullopt;
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}
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// Read WAV file
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// Read Opus file
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std::ifstream file(temp_file, std::ios::binary);
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if (!file.is_open()) {
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std::cerr << "Failed to open temporary WAV file" << std::endl;
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std::cerr << "Failed to open temporary Opus file" << std::endl;
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return std::nullopt;
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}
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std::ostringstream wav_stream;
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wav_stream << file.rdbuf();
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std::string wav_data = wav_stream.str();
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std::ostringstream opus_stream;
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opus_stream << file.rdbuf();
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std::string opus_data = opus_stream.str();
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file.close();
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// Make HTTP request
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@ -56,7 +56,7 @@ std::optional<WhisperResponse> WhisperClient::transcribe(
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};
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httplib::UploadFormDataItems items;
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items.push_back({"file", wav_data, "audio.wav", "audio/wav"});
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items.push_back({"file", opus_data, "audio.opus", "audio/ogg"});
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items.push_back({"model", model, "", ""});
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items.push_back({"language", language, "", ""});
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items.push_back({"temperature", std::to_string(temperature), "", ""});
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@ -3,6 +3,9 @@
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#include <cstring>
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#include <cstdint>
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#include <algorithm>
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#include <iostream>
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#include <opus.h>
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#include <ogg/ogg.h>
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namespace secondvoice {
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@ -74,4 +77,169 @@ bool AudioBuffer::saveToWav(const std::string& filename) const {
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return true;
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}
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bool AudioBuffer::saveToOpus(const std::string& filename) const {
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if (samples_.empty()) {
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std::cerr << "AudioBuffer::saveToOpus: No samples to encode" << std::endl;
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return false;
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}
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// Create Opus encoder
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int error;
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OpusEncoder* encoder = opus_encoder_create(
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sample_rate_,
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channels_,
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OPUS_APPLICATION_VOIP, // Optimized for voice
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&error
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);
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if (error != OPUS_OK || !encoder) {
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std::cerr << "Failed to create Opus encoder: " << opus_strerror(error) << std::endl;
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return false;
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}
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// Configure encoder for best quality/compression tradeoff
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opus_encoder_ctl(encoder, OPUS_SET_BITRATE(32000)); // 32 kbps (good for voice)
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opus_encoder_ctl(encoder, OPUS_SET_VBR(1)); // Variable bitrate
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opus_encoder_ctl(encoder, OPUS_SET_COMPLEXITY(5)); // Medium complexity
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// Open output file
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std::ofstream file(filename, std::ios::binary);
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if (!file.is_open()) {
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opus_encoder_destroy(encoder);
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return false;
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}
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// Initialize Ogg stream
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ogg_stream_state stream_state;
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ogg_page page;
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ogg_packet packet;
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// Random serial number for Ogg stream
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ogg_stream_init(&stream_state, 12345);
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// Create Opus header (OpusHead)
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unsigned char header_data[19] = {
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'O', 'p', 'u', 's', 'H', 'e', 'a', 'd', // Magic signature
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1, // Version
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static_cast<unsigned char>(channels_), // Channel count
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0, 0, // Pre-skip (little-endian, 0)
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static_cast<unsigned char>(sample_rate_ & 0xFF),
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static_cast<unsigned char>((sample_rate_ >> 8) & 0xFF),
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static_cast<unsigned char>((sample_rate_ >> 16) & 0xFF),
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static_cast<unsigned char>((sample_rate_ >> 24) & 0xFF),
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0, 0, // Output gain (little-endian, 0)
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0 // Channel mapping family (0 = mono/stereo)
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};
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packet.packet = header_data;
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packet.bytes = 19;
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packet.b_o_s = 1; // Beginning of stream
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packet.e_o_s = 0;
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packet.granulepos = 0;
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packet.packetno = 0;
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ogg_stream_packetin(&stream_state, &packet);
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// Write header pages
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while (ogg_stream_flush(&stream_state, &page) != 0) {
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file.write(reinterpret_cast<char*>(page.header), page.header_len);
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file.write(reinterpret_cast<char*>(page.body), page.body_len);
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}
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// Create Opus comment header (OpusTags)
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const char* vendor = "SecondVoice";
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size_t vendor_len = strlen(vendor);
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size_t comment_header_size = 8 + 4 + vendor_len + 4;
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std::vector<unsigned char> comment_header(comment_header_size);
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memcpy(&comment_header[0], "OpusTags", 8);
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comment_header[8] = vendor_len & 0xFF;
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comment_header[9] = (vendor_len >> 8) & 0xFF;
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comment_header[10] = (vendor_len >> 16) & 0xFF;
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comment_header[11] = (vendor_len >> 24) & 0xFF;
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memcpy(&comment_header[12], vendor, vendor_len);
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// Number of user comments (0)
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comment_header[12 + vendor_len] = 0;
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comment_header[13 + vendor_len] = 0;
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comment_header[14 + vendor_len] = 0;
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comment_header[15 + vendor_len] = 0;
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packet.packet = comment_header.data();
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packet.bytes = comment_header_size;
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packet.b_o_s = 0;
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packet.e_o_s = 0;
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packet.granulepos = 0;
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packet.packetno = 1;
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ogg_stream_packetin(&stream_state, &packet);
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while (ogg_stream_flush(&stream_state, &page) != 0) {
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file.write(reinterpret_cast<char*>(page.header), page.header_len);
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file.write(reinterpret_cast<char*>(page.body), page.body_len);
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}
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// Encode audio in frames
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// Opus recommends 20ms frames: frame_size = sample_rate * 0.02
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int frame_size = sample_rate_ / 50; // 20ms
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int frame_samples = frame_size * channels_;
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std::vector<unsigned char> encoded_data(4000); // Max packet size for Opus
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int64_t packetno = 2;
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int64_t granulepos = 0;
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for (size_t i = 0; i < samples_.size(); i += frame_samples) {
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// Get frame (pad with zeros if incomplete)
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std::vector<float> frame(frame_samples, 0.0f);
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size_t samples_to_copy = std::min(frame_samples, static_cast<int>(samples_.size() - i));
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std::copy(samples_.begin() + i, samples_.begin() + i + samples_to_copy, frame.begin());
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// Encode frame
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int encoded_bytes = opus_encode_float(
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encoder,
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frame.data(),
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frame_size,
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encoded_data.data(),
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encoded_data.size()
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);
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if (encoded_bytes < 0) {
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std::cerr << "Opus encoding failed: " << opus_strerror(encoded_bytes) << std::endl;
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opus_encoder_destroy(encoder);
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ogg_stream_clear(&stream_state);
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return false;
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}
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// Create Ogg packet
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granulepos += frame_size;
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packet.packet = encoded_data.data();
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packet.bytes = encoded_bytes;
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packet.b_o_s = 0;
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packet.e_o_s = (i + frame_samples >= samples_.size()) ? 1 : 0;
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packet.granulepos = granulepos;
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packet.packetno = packetno++;
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ogg_stream_packetin(&stream_state, &packet);
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// Write pages
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while (ogg_stream_pageout(&stream_state, &page) != 0) {
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file.write(reinterpret_cast<char*>(page.header), page.header_len);
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file.write(reinterpret_cast<char*>(page.body), page.body_len);
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}
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}
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// Flush remaining pages
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while (ogg_stream_flush(&stream_state, &page) != 0) {
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file.write(reinterpret_cast<char*>(page.header), page.header_len);
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file.write(reinterpret_cast<char*>(page.body), page.body_len);
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}
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// Cleanup
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opus_encoder_destroy(encoder);
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ogg_stream_clear(&stream_state);
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file.close();
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std::cout << "Saved Opus file: " << filename << std::endl;
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return true;
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}
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} // namespace secondvoice
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@ -14,6 +14,7 @@ public:
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void clear();
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bool saveToWav(const std::string& filename) const;
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bool saveToOpus(const std::string& filename) const;
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size_t size() const { return samples_.size(); }
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bool empty() const { return samples_.empty(); }
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