FreeCalypso > hg > gsm-codec-lib
view libtest/wavrdhelp.c @ 477:4c9222d95647
libtwamr encoder: always emit frame->mode = mode;
In the original implementation of amr_encode_frame(), the 'mode' member
of the output struct was set to 0xFF if the output frame type is TX_NO_DATA.
This design was made to mimic the mode field (16-bit word) being set to
0xFFFF (or -1) in 3GPP test sequence format - but nothing actually depends
on this struct member being set in any way, and amr_frame_to_tseq()
generates the needed 0xFFFF on its own, based on frame->type being equal
to TX_NO_DATA.
It is simpler and more efficient to always set frame->mode to the actual
encoding mode in amr_encode_frame(), and this new behavior has already
been documented in doc/AMR-library-API description in anticipation of
the present change.
author | Mychaela Falconia <falcon@freecalypso.org> |
---|---|
date | Sat, 18 May 2024 22:30:42 +0000 |
parents | 30d1d0a705c0 |
children |
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/* * In this module we implement our helper functions * on top of the basic WAV reader. */ #include <stdio.h> #include <stdint.h> #include "wavreader.h" #include "wavrdhelp.h" int wavrd_check_header(void *wav, const char *filename) { int format, sampleRate, channels, bitsPerSample; if (!wav_get_header(wav, &format, &channels, &sampleRate, &bitsPerSample, NULL)) { fprintf(stderr, "error: %s is not a valid WAV file\n", filename); return -1; } if (format != 1) { fprintf(stderr, "error: %s has unsupported WAV format %d\n", filename, format); return -1; } if (bitsPerSample != 16) { fprintf(stderr, "error: %s has unsupported WAV sample depth %d\n", filename, bitsPerSample); return -1; } if (channels != 1) { fprintf(stderr, "error: %s has %d channels, need 1\n", filename, channels); return -1; } if (sampleRate != 8000) { fprintf(stderr, "error: %s has %d Hz sample rate, need 8000 Hz\n", filename, sampleRate); return -1; } return 0; } int wavrd_get_pcm_block(void *wav, int16_t *pcm) { uint8_t bytes[320], *dp; int cc, i; cc = wav_read_data(wav, bytes, 320); cc >>= 1; dp = bytes; for (i = 0; i < cc; i++) { pcm[i] = dp[0] | (dp[1] << 8); dp += 2; } while (i < 160) pcm[i++] = 0; return cc; }