MMichael S. Tsirkinvirtio-sound: implement audio output (TX)
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asc: generate silence if FIFO empty but engine still running MacOS (un)helpfully leaves the FIFO engine running even when all the samples have been written to the hardware, and expects the FIFO status flags and IRQ to be updated continuously. There is an additional problem in that not all audio backends guarantee an all-zero output when there is no FIFO data available, in particular the Windows dsound backend which re-uses its internal circular buffer causing the last played sound to loop indefinitely. Whilst this is effectively a bug in the Windows dsound backend, work around it for now using a simple heuristic: if the FIFO remains empty for half a cycle (~23ms) then continuously fill the generated buffer with empty silence. Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk> Reviewed-by: Laurent Vivier <laurent@vivier.eu> Message-ID: <20231004083806.757242-9-mark.cave-ayland@ilande.co.uk> Signed-off-by: Laurent Vivier <laurent@vivier.eu> | 2 年前 | |
hw/audio/pcspk: Inline pcspk_init() pcspk_init() is a legacy init function, inline and remove it. Since the device is realized using &error_fatal, use the same error for setting the "pit" link. Reviewed-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk> Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org> Message-Id: <20231019073307.99608-1-philmd@linaro.org> | 2 年前 | |
hw/audio/soundhw: Clean up global variable shadowing Fix: hw/audio/soundhw.c:86:33: error: declaration shadows a variable in the global scope [-Werror,-Wshadow] void select_soundhw(const char *optarg, const char *audiodev) ^ /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/getopt.h:77:14: note: previous declaration is here extern char *optarg; /* getopt(3) external variables */ ^ Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org> Message-ID: <20231004120019.93101-2-philmd@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Thomas Huth <thuth@redhat.com> Signed-off-by: Markus Armbruster <armbru@redhat.com> | 2 年前 | |
virtio-sound: implement audio output (TX) Handle output IO messages in the transmit (TX) virtqueue. It allocates a VirtIOSoundPCMBuffer for each IO message and copies the data buffer to it. When the IO buffer is written to the host's sound card, the guest will be notified that it has been consumed. The lifetime of an IO message is: 1. Guest sends IO message to TX virtqueue. 2. QEMU adds it to the appropriate stream's IO buffer queue. 3. Sometime later, the host audio backend calls the output callback, virtio_snd_pcm_out_cb(), which is defined with an AUD_open_out() call. The callback gets an available number of bytes the backend can receive. Then it writes data from the IO buffer queue to the backend. If at any time a buffer is exhausted, it is returned to the guest as completed. 4. If the guest releases the stream, its buffer queue is flushed by attempting to write any leftover data to the audio backend and releasing all IO messages back to the guest. This is how according to the spec the guest knows the release was successful. Based-on: https://github.com/OpenSynergy/qemu/commit/5a2f350eec5d157b90d9c7b40a8e603f4da92471 Signed-off-by: Igor Skalkin <Igor.Skalkin@opensynergy.com> Signed-off-by: Anton Yakovlev <Anton.Yakovlev@opensynergy.com> Signed-off-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Tested-by: Alex Bennée <alex.bennee@linaro.org> Message-Id: <b7c6fc458c763d09a4abbcb620ae9b220afa5b8f.1698062525.git.manos.pitsidianakis@linaro.org> Acked-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> | 2 年前 | |
Include hw/hw.h exactly where needed In my "build everything" tree, changing hw/hw.h triggers a recompile of some 2600 out of 6600 objects (not counting tests and objects that don't depend on qemu/osdep.h). The previous commits have left only the declaration of hw_error() in hw/hw.h. This permits dropping most of its inclusions. Touching it now recompiles less than 200 objects. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Message-Id: <20190812052359.30071-19-armbru@redhat.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com> | 6 年前 |