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5d978c5da7
Commited2a4a7941("audio: proper support for float samples in mixeng") added support for float audio samples. As there were no audio frontend devices with float support at that time, the code was limited to native endian float samples. When nobody was paying attention, an audio device that supports floating point samples crept in with commiteb9ad377bb("virtio-sound: handle control messages and streams"). Add code for the audio subsystem to convert float samples to the correct endianness. The type punning code was taken from the PipeWire project. Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com> Signed-off-by: Volker Rümelin <vr_qemu@t-online.de> Message-Id: <20250515054429.7385-7-vr_qemu@t-online.de>
60 lines
2.5 KiB
C
60 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 endianness][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][swap endianness] */
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extern t_sample *mixeng_conv_float[2][2];
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extern f_sample *mixeng_clip_float[2][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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