Mp3dllcc -

Callbacks prototype (C):

typedef ssize_t (*mp3_stream_cb_t)(void *user_ctx, uint8_t *buf, size_t buf_size);

Example: network streaming encode (pseudo):

Latency:

API:

mp3_error_t mp3_encoder_init(mp3_handle_t *h, const mp3_config_t *cfg);
mp3_error_t mp3_encode_frame(mp3_handle_t *h, const int16_t *pcm_in, size_t frames, uint8_t *mp3_out, size_t mp3_out_size, size_t *mp3_bytes_written);
mp3_error_t mp3_encoder_flush(mp3_handle_t *h, uint8_t *mp3_out, size_t mp3_out_size, size_t *mp3_bytes_written);

Encoder config (example fields):

Example (C):

mp3_handle_t *h = NULL;
mp3_open_file("out.mp3", MP3_MODE_ENCODE, &h);
mp3_config_t cfg =  .bitrate_kbps = 192, .sample_rate = 44100, .channels = 2, .quality = 2, .vbr_enabled = 1, .vbr_quality = 4 ;
mp3_encoder_init(h, &cfg);
int16_t pcm[1152 * 2];
uint8_t outbuf[8192];
size_t out_bytes;
while (have_more_pcm()) 
    size_t frames = read_pcm(pcm, 1152);
    mp3_encode_frame(h, pcm, frames, outbuf, sizeof(outbuf), &out_bytes);
    fwrite(outbuf, 1, out_bytes, out_mp3_file);
mp3_encoder_flush(h, outbuf, sizeof(outbuf), &out_bytes);
fwrite(outbuf, 1, out_bytes, out_mp3_file);
mp3_close(h);

Notes:

Users typically encounter mp3dllcc.dll only when an error occurs. Common error messages include:

Threading:

In the early 2000s, the MP3 format was a battleground. The standard code was good, but "unoptimized." A group of audio wizards took the LAME source code (LAME Ain't an MP3 Encoder) and compiled it into Windows DLL files (Dynamic Link Libraries) using intense compiler flags (Intel C++, GCC, etc.).

mp3dllcc likely refers to a repository or compilation of these engines. mp3dllcc