a9ea567873
Introduce the new function st_rate_frames_out() to calculate the exact number of audio output frames the resampling code can generate from a given number of audio input frames. When upsampling, this function returns the maximum number of output frames. This new function replaces the audio_frontend_frames_in() function, which calculated the average number of output frames rounded down to the nearest integer. The audio_frontend_frames_in() function was additionally used to limit the number of output frames to the resample buffer size. In audio_pcm_sw_read() the variable resample_buf.size replaces the open coded audio_frontend_frames_in() function. In audio_run_in() an additional MIN() function is necessary. After this patch the audio packet length calculation for audio recording is exact. Acked-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk> Signed-off-by: Volker Rümelin <vr_qemu@t-online.de> Message-Id: <20230224190555.7409-12-vr_qemu@t-online.de>
61 lines
2.5 KiB
C
61 lines
2.5 KiB
C
/*
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* QEMU Mixing engine header
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*
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* Copyright (c) 2004-2005 Vassili Karpov (malc)
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#ifndef QEMU_MIXENG_H
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#define QEMU_MIXENG_H
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#ifdef FLOAT_MIXENG
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typedef float mixeng_real;
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struct mixeng_volume { int mute; mixeng_real r; mixeng_real l; };
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struct st_sample { mixeng_real l; mixeng_real r; };
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#else
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struct mixeng_volume { int mute; int64_t r; int64_t l; };
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struct st_sample { int64_t l; int64_t r; };
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#endif
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typedef struct st_sample st_sample;
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typedef void (t_sample) (struct st_sample *dst, const void *src, int samples);
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typedef void (f_sample) (void *dst, const struct st_sample *src, int samples);
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/* indices: [stereo][signed][swap endiannes][8, 16 or 32-bits] */
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extern t_sample *mixeng_conv[2][2][2][3];
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extern f_sample *mixeng_clip[2][2][2][3];
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/* indices: [stereo] */
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extern t_sample *mixeng_conv_float[2];
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extern f_sample *mixeng_clip_float[2];
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void *st_rate_start (int inrate, int outrate);
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void st_rate_flow(void *opaque, st_sample *ibuf, st_sample *obuf,
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size_t *isamp, size_t *osamp);
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void st_rate_flow_mix(void *opaque, st_sample *ibuf, st_sample *obuf,
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size_t *isamp, size_t *osamp);
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void st_rate_stop (void *opaque);
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uint32_t st_rate_frames_out(void *opaque, uint32_t frames_in);
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uint32_t st_rate_frames_in(void *opaque, uint32_t frames_out);
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void mixeng_clear (struct st_sample *buf, int len);
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void mixeng_volume (struct st_sample *buf, int len, struct mixeng_volume *vol);
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#endif /* QEMU_MIXENG_H */
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