lavdevice: Add AudioToolbox output device.

Changelog

@@ -2,6 +2,7 @@ Entries are sorted chronologically from oldest to youngest within each release,
 releases are sorted from youngest to oldest.
 
 version <next>:
+- AudioToolbox output device
 
 
 version 4.3:

configure

@@ -3367,6 +3367,8 @@ alsa_outdev_deps="alsa"
 avfoundation_indev_deps="avfoundation corevideo coremedia pthreads"
 avfoundation_indev_suggest="coregraphics applicationservices"
 avfoundation_indev_extralibs="-framework Foundation"
+audiotoolbox_outdev_deps="audiotoolbox pthreads"
+audiotoolbox_outdev_extralibs="-framework AudioToolbox -framework CoreAudio"
 bktr_indev_deps_any="dev_bktr_ioctl_bt848_h machine_ioctl_bt848_h dev_video_bktr_ioctl_bt848_h dev_ic_bt8xx_h"
 caca_outdev_deps="libcaca"
 decklink_deps_any="libdl LoadLibrary"
@@ -6152,6 +6154,7 @@ enabled videotoolbox && check_apple_framework VideoToolbox
 check_apple_framework CoreFoundation
 check_apple_framework CoreMedia
 check_apple_framework CoreVideo
+check_apple_framework CoreAudio
 
 enabled avfoundation && {
     disable coregraphics applicationservices

doc/outdevs.texi

@@ -38,6 +38,52 @@ ffmpeg -i INPUT -f alsa hw:1,7
 @end example
 @end itemize
 
+@section AudioToolbox
+
+AudioToolbox output device.
+
+Allows native output to CoreAudio devices on OSX.
+
+The output filename can be empty (or @code{-}) to refer to the default system output device or a number that refers to the device index as shown using: @code{-list_devices true}.
+
+Alternatively, the audio input device can be chosen by index using the
+@option{
+    -audio_device_index <INDEX>
+}
+, overriding any device name or index given in the input filename.
+
+All available devices can be enumerated by using @option{-list_devices true}, listing
+all device names, UIDs and corresponding indices.
+
+@subsection Options
+
+AudioToolbox supports the following options:
+
+@table @option
+
+@item -audio_device_index <INDEX>
+Specify the audio device by its index. Overrides anything given in the output filename.
+
+@end table
+
+@subsection Examples
+
+@itemize
+
+@item
+Print the list of supported devices and output a sine wave to the default device:
+@example
+$ ffmpeg -f lavfi -i sine=r=44100 -f audiotoolbox -list_devices true -
+@end example
+
+@item
+Output a sine wave to the device with the index 2, overriding any output filename:
+@example
+$ ffmpeg -f lavfi -i sine=r=44100 -f audiotoolbox -audio_device_index 2 -
+@end example
+
+@end itemize
+
 @section caca
 
 CACA output device.

libavdevice/Makefile

@@ -15,6 +15,7 @@ OBJS-$(CONFIG_SHARED)                    += reverse.o
 OBJS-$(CONFIG_ALSA_INDEV)                += alsa_dec.o alsa.o timefilter.o
 OBJS-$(CONFIG_ALSA_OUTDEV)               += alsa_enc.o alsa.o
 OBJS-$(CONFIG_ANDROID_CAMERA_INDEV)      += android_camera.o
+OBJS-$(CONFIG_AUDIOTOOLBOX_OUTDEV)       += audiotoolbox.o
 OBJS-$(CONFIG_AVFOUNDATION_INDEV)        += avfoundation.o
 OBJS-$(CONFIG_BKTR_INDEV)                += bktr.o
 OBJS-$(CONFIG_CACA_OUTDEV)               += caca.o

libavdevice/alldevices.c

@@ -27,6 +27,7 @@
 extern AVInputFormat  ff_alsa_demuxer;
 extern AVOutputFormat ff_alsa_muxer;
 extern AVInputFormat  ff_android_camera_demuxer;
+extern AVOutputFormat ff_audiotoolbox_muxer;
 extern AVInputFormat  ff_avfoundation_demuxer;
 extern AVInputFormat  ff_bktr_demuxer;
 extern AVOutputFormat ff_caca_muxer;