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C
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150// audio-decode.h — Streaming audio file decoder for DJ decks// Uses FFmpeg (libavformat/libavcodec/libswresample) to decode MP3/WAV/FLAC/OGG/AAC// into a lock-free stereo float ring buffer consumed by the audio thread.
#ifndef AC_AUDIO_DECODE_H#define AC_AUDIO_DECODE_H
#ifdef HAVE_AVCODEC
#include <pthread.h>#include <stdint.h>
// ~5 seconds of stereo float at 192kHz = ~7.7 MB per decoder#define DECK_RING_SECONDS 5
typedef struct ACDeckDecoder { // Ring buffer: interleaved stereo float (L, R, L, R, ...) float *ring; int ring_size; // capacity in frames (not samples) volatile int ring_write; // monotonic write position (frames) volatile int ring_read; // monotonic read position (frames)
// Decoder thread pthread_t thread; pthread_mutex_t mutex; pthread_cond_t cond; volatile int thread_running; // thread alive volatile int decoding; // actively decoding (vs paused/finished)
// Seek request (set by main thread, consumed by decoder thread) volatile int seek_requested; volatile double seek_target; // seconds
// Speed control (pitch-coupled, like vinyl) volatile double speed; // 1.0 = normal, negative = reverse double ring_frac; // fractional read position for interpolated speed
// Track metadata double duration; // total duration in seconds volatile double position; // current playback position in seconds int src_sample_rate; // source file sample rate int src_channels; // source file channels unsigned int out_rate; // output sample rate (e.g. 192000) char path[512]; char title[256]; char artist[256];
// Status volatile int loaded; // file opened successfully volatile int finished; // reached end of file volatile int error; volatile int is_stream; // 1 = live network stream (radio): no // duration, no seek, no peak pre-scan char error_msg[128];
// FFmpeg state (opaque, managed internally) void *fmt_ctx; // AVFormatContext* void *codec_ctx; // AVCodecContext* void *swr; // SwrContext* int stream_idx; // audio stream index
// Waveform peaks (decimated max-amplitude samples for visualization) // Generated once on load by scanning the entire file via separate pass. float *peaks; // [0..1] amplitude peaks int peak_count; // number of peaks (typically 1024)
// Optional downscaled video preview frames for pieces like tapes.mjs. // Frames are stored as opaque ARGB32 pixels (0xAARRGGBB) in a flat array: // [frame0 pixels][frame1 pixels]... uint32_t *video_frames; int video_frame_count; int video_width; int video_height; double video_fps; volatile int video_ready;} ACDeckDecoder;
// Create a decoder instance for the given output sample rateACDeckDecoder *deck_decoder_create(unsigned int output_rate);
// Load an audio file. Starts decoder thread. Returns 0 on success, -1 on error.int deck_decoder_load(ACDeckDecoder *d, const char *path);
// Playback controlvoid deck_decoder_play(ACDeckDecoder *d);void deck_decoder_pause(ACDeckDecoder *d);void deck_decoder_seek(ACDeckDecoder *d, double seconds);void deck_decoder_set_speed(ACDeckDecoder *d, double speed); // 0.5–2.0
// Unload current file and stop thread (decoder can be reused with another load)void deck_decoder_unload(ACDeckDecoder *d);
// Generate peaks for the loaded file (call after deck_decoder_load).// Decodes the entire file once and writes max-amplitude peaks per chunk.// Safe to call from main thread; takes a few hundred ms for typical tracks.int deck_decoder_generate_peaks(ACDeckDecoder *d, int target_count);
// Generate a lightweight downscaled video preview strip for the loaded file.// Safe to call from main thread; intended for UI playback rather than full-res video.int deck_decoder_generate_video_preview(ACDeckDecoder *d, int width, int height, int fps);
// Destroy decoder and free all resourcesvoid deck_decoder_destroy(ACDeckDecoder *d);
#else // !HAVE_AVCODEC
// Stubs when FFmpeg is not availabletypedef struct ACDeckDecoder { volatile int loaded; volatile int playing; volatile int finished; volatile double position; double duration; volatile double speed; char title[256]; char artist[256]; char error_msg[128]; volatile int error; // Ring buffer stubs for audio thread float *ring; int ring_size; volatile int ring_write; volatile int ring_read; uint32_t *video_frames; int video_frame_count; int video_width; int video_height; double video_fps; volatile int video_ready;} ACDeckDecoder;
static inline ACDeckDecoder *deck_decoder_create(unsigned int output_rate) { (void)output_rate; return 0;}static inline int deck_decoder_load(ACDeckDecoder *d, const char *path) { (void)d; (void)path; return -1;}static inline void deck_decoder_play(ACDeckDecoder *d) { (void)d; }static inline void deck_decoder_pause(ACDeckDecoder *d) { (void)d; }static inline void deck_decoder_seek(ACDeckDecoder *d, double s) { (void)d; (void)s; }static inline void deck_decoder_set_speed(ACDeckDecoder *d, double s) { (void)d; (void)s; }static inline void deck_decoder_unload(ACDeckDecoder *d) { (void)d; }static inline void deck_decoder_destroy(ACDeckDecoder *d) { (void)d; }static inline int deck_decoder_generate_video_preview(ACDeckDecoder *d, int width, int height, int fps) { (void)d; (void)width; (void)height; (void)fps; return -1;}
#endif // HAVE_AVCODEC#endif // AC_AUDIO_DECODE_H