FreeCalypso > hg > gsm-codec-lib
comparison libtwamr/dhf_subst2.c @ 464:fa0652115168
libtwamr: add amr_dhf_subst_efr2()
| author | Mychaela Falconia <falcon@freecalypso.org> |
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| date | Sun, 12 May 2024 21:36:26 +0000 |
| parents | |
| children |
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| 463:9208db14b4b9 | 464:fa0652115168 |
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| 1 /* | |
| 2 * The function implemented in this module is an aid for AMR-EFR interworking; | |
| 3 * it is meant to be invoked directly after amr_encode_frame(). It checks | |
| 4 * the encoder output for MR122 DHF and turns it into EFR DHF just like | |
| 5 * amr_dhf_subst_efr(), but only if the input PCM frame was an EHF. This | |
| 6 * slightly more complicated logic is needed in order to replicate the observed | |
| 7 * behavior of AMR-EFR speech encoder in the extant GSM network of T-Mobile USA. | |
| 8 */ | |
| 9 | |
| 10 #include "tw_amr.h" | |
| 11 #include "namespace.h" | |
| 12 #include "e_homing.h" | |
| 13 | |
| 14 void amr_dhf_subst_efr2(struct amr_param_frame *frame, const int16_t *pcm) | |
| 15 { | |
| 16 if (encoder_homing_frame_test(pcm)) | |
| 17 amr_dhf_subst_efr(frame); | |
| 18 } |