gsmhr_decoder_twts002_in(): set BFI=1 SID=1 for invalid SID When a received TW-TS-002 RTP payload indicates invalid SID, which of the 3 possible BFI/SID combinations should we pass to our internal ETSI-based speech decoder or TFO engine? Our original code passed BFI=0 SID=1, but upon further reflection, BFI=1 SID=1 is a better choice. In the corner case where received invalid SID is fed to a full decoder in homed state, setting BFI=1 allows that decoder to emit zeros on PCM and stay homed, instead of launching into full decoding.

/*
 * We implement a couple of helper functions on top of the WAV reader
 * which we've lifted out of opencore-amrnb test code; this header file
 * provides prototype declarations for these functions.
 */

extern int wavrd_check_header(void *wav, const char *filename);
extern int wavrd_get_pcm_block(void *wav, int16_t *pcmbuf);