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SRC/Speex: Add support for querying required input frame counts.

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This commit is contained in:
David Reid
2020-01-19 14:23:35 +10:00
parent 3e8f261c6f
commit 959885a303
2 changed files with 68 additions and 6 deletions
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extras/speex_resampler/ma_speex_resampler.h
+29
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@@ -6,6 +6,8 @@
#define RANDOM_PREFIX ma_speex
#include "thirdparty/speex_resampler.h"
int ma_speex_resampler_get_required_input_frame_count(SpeexResamplerState* st, spx_uint32_t out_len, spx_uint32_t* in_len);
#endif /* ma_speex_resampler_h */
#if defined(MINIAUDIO_SPEEX_RESAMPLER_IMPLEMENTATION)
@@ -23,4 +25,31 @@
#else
#pragma GCC diagnostic pop
#endif
EXPORT int ma_speex_resampler_get_required_input_frame_count(SpeexResamplerState* st, spx_uint32_t out_len, spx_uint32_t* in_len)
{
spx_uint32_t count;
if (st == NULL || in_len == NULL) {
return RESAMPLER_ERR_INVALID_ARG;
}
*in_len = 0;
if (out_len == 0) {
return RESAMPLER_ERR_SUCCESS; /* Nothing to do. */
}
/* miniaudio only uses interleaved APIs so we can safely just use channel index 0 for the calculations. */
if (st->nb_channels == 0) {
return RESAMPLER_ERR_BAD_STATE;
}
count = out_len * st->int_advance;
count += (st->samp_frac_num[0] + (out_len * st->frac_advance)) / st->den_rate;
*in_len = count;
return RESAMPLER_ERR_SUCCESS;
}
#endif