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The pa_resampler_get_delay() function allows to retrieve the current resampler delay in input samples for all supported resamplers. The return value is a double to maintain precision when using variable rate resamplers. Because in many places the delay is needed in usec, pa_resampler_get_delay_usec() was also supplied. The speex resampler now skips leading zero samples to provide meaningful delay values. In the next patch, the pa_resampler_prepare() function will be used to train the resampler after a rewind. It takes data from a history memblockq and runs it through the resampler. The output data is discarded. To make this logic possible, the soxr resampler had to be converted to use variable rate. The fixed rate version has a variable delay, therefore the logic above could not be applied. Additionally, with fixed rate, the delay is larger than 150ms in some situations, while with variable rate the delay is fixed and comparable to the other resamplers. Part-of: <https://gitlab.freedesktop.org/pulseaudio/pulseaudio/-/merge_requests/120> |
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| .. | ||
| ffmpeg.c | ||
| libsamplerate.c | ||
| peaks.c | ||
| soxr.c | ||
| speex.c | ||
| trivial.c | ||