diff options
Diffstat (limited to 'audio/out/ao_coreaudio_utils.c')
| -rw-r--r-- | audio/out/ao_coreaudio_utils.c | 358 |
1 files changed, 358 insertions, 0 deletions
diff --git a/audio/out/ao_coreaudio_utils.c b/audio/out/ao_coreaudio_utils.c new file mode 100644 index 0000000000..bbeaa8bd1c --- /dev/null +++ b/audio/out/ao_coreaudio_utils.c @@ -0,0 +1,358 @@ +/* + * This file is part of mpv. + * + * mpv is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * mpv is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with mpv. If not, see <http://www.gnu.org/licenses/>. + */ + +/* + * This file contains functions interacting with the CoreAudio framework + * that are not specific to the AUHAL. These are split in a separate file for + * the sake of readability. In the future the could be used by other AOs based + * on CoreAudio but not the AUHAL (such as using AudioQueue services). + */ + +#include "audio/out/ao_coreaudio_utils.h" +#include "audio/out/ao_coreaudio_properties.h" +#include "osdep/timer.h" + +#define ca_msg(a, b ...) mp_msg(MSGT_AO, a, "AO: [coreaudio] " b) +#define CA_CFSTR_ENCODING kCFStringEncodingASCII + +char *fourcc_repr(void *talloc_ctx, uint32_t code) +{ + // Extract FourCC letters from the uint32_t and finde out if it's a valid + // code that is made of letters. + char fcc[4] = { + (code >> 24) & 0xFF, + (code >> 16) & 0xFF, + (code >> 8) & 0xFF, + code & 0xFF, + }; + + bool valid_fourcc = true; + for (int i = 0; i < 4; i++) + if (!isprint(fcc[i])) + valid_fourcc = false; + + char *repr; + if (valid_fourcc) + repr = talloc_asprintf(talloc_ctx, "'%c%c%c%c'", + fcc[0], fcc[1], fcc[2], fcc[3]); + else + repr = talloc_asprintf(NULL, "%d", code); + + return repr; +} + +bool check_ca_st(int level, OSStatus code, const char *message) +{ + if (code == noErr) return true; + + char *error_string = fourcc_repr(NULL, code); + ca_msg(level, "%s (%s)\n", message, error_string); + talloc_free(error_string); + + return false; +} + +void ca_print_asbd(const char *description, + const AudioStreamBasicDescription *asbd) +{ + uint32_t flags = asbd->mFormatFlags; + char *format = fourcc_repr(NULL, asbd->mFormatID); + + ca_msg(MSGL_V, + "%s %7.1fHz %" PRIu32 "bit [%s]" + "[%" PRIu32 "][%" PRIu32 "][%" PRIu32 "]" + "[%" PRIu32 "][%" PRIu32 "] " + "%s %s %s%s%s%s\n", + description, asbd->mSampleRate, asbd->mBitsPerChannel, format, + asbd->mFormatFlags, asbd->mBytesPerPacket, asbd->mFramesPerPacket, + asbd->mBytesPerFrame, asbd->mChannelsPerFrame, + (flags & kAudioFormatFlagIsFloat) ? "float" : "int", + (flags & kAudioFormatFlagIsBigEndian) ? "BE" : "LE", + (flags & kAudioFormatFlagIsSignedInteger) ? "S" : "U", + (flags & kAudioFormatFlagIsPacked) ? " packed" : "", + (flags & kAudioFormatFlagIsAlignedHigh) ? " aligned" : "", + (flags & kAudioFormatFlagIsNonInterleaved) ? " P" : ""); + + talloc_free(format); +} + +int AudioFormatIsDigital(AudioStreamBasicDescription asbd) +{ + switch (asbd.mFormatID) + case 'IAC3': + case 'iac3': + case kAudioFormat60958AC3: + case kAudioFormatAC3: + return CONTROL_OK; + return CONTROL_FALSE; +} + +int AudioStreamSupportsDigital(AudioStreamID stream) +{ + AudioStreamRangedDescription *formats = NULL; + + /* Retrieve all the stream formats supported by each output stream. */ + uint32_t size = + GetGlobalAudioPropertyArray(stream, + kAudioStreamPropertyAvailablePhysicalFormats, + (void **)&formats); + + if (!size) { + ca_msg(MSGL_WARN, "Could not get number of stream formats.\n"); + return CONTROL_FALSE; + } + + const int n_formats = size / sizeof(AudioStreamRangedDescription); + for (int i = 0; i < n_formats; i++) { + AudioStreamBasicDescription asbd = formats[i].mFormat; + ca_print_asbd("supported format:", &(asbd)); + if (AudioFormatIsDigital(asbd)) { + free(formats); + return CONTROL_TRUE; + } + } + + free(formats); + return CONTROL_FALSE; +} + +int AudioDeviceSupportsDigital(AudioDeviceID device) +{ + AudioStreamID *streams = NULL; + + /* Retrieve all the output streams. */ + uint32_t size = GetAudioPropertyArray(device, + kAudioDevicePropertyStreams, + kAudioDevicePropertyScopeOutput, + (void **)&streams); + + if (!size) { + ca_msg(MSGL_WARN, "could not get number of streams.\n"); + return CONTROL_FALSE; + } + + const int n_streams = size / sizeof(AudioStreamID); + for (int i = 0; i < n_streams; i++) { + if (AudioStreamSupportsDigital(streams[i])) { + free(streams); + return CONTROL_OK; + } + } + + free(streams); + return CONTROL_FALSE; +} + +OSStatus ca_property_listener(AudioObjectPropertySelector selector, + AudioObjectID object, uint32_t n_addresses, + const AudioObjectPropertyAddress addresses[], + void *data) +{ + void *talloc_ctx = talloc_new(NULL); + + for (int i = 0; i < n_addresses; i++) { + if (addresses[i].mSelector == selector) { + ca_msg(MSGL_WARN, "event: property %s changed\n", + fourcc_repr(talloc_ctx, selector)); + if (data) *(volatile int *)data = 1; + break; + } + } + talloc_free(talloc_ctx); + return noErr; +} + +OSStatus ca_stream_listener(AudioObjectID object, uint32_t n_addresses, + const AudioObjectPropertyAddress addresses[], + void *data) +{ + return ca_property_listener(kAudioStreamPropertyPhysicalFormat, + object, n_addresses, addresses, data); +} + +OSStatus ca_device_listener(AudioObjectID object, uint32_t n_addresses, + const AudioObjectPropertyAddress addresses[], + void *data) +{ + return ca_property_listener(kAudioDevicePropertyDeviceHasChanged, + object, n_addresses, addresses, data); +} + +OSStatus ca_lock_device(AudioDeviceID device, pid_t *pid) { + *pid = getpid(); + OSStatus err = SetAudioProperty(device, kAudioDevicePropertyHogMode, + sizeof(*pid), pid); + if (err != noErr) + *pid = -1; + + return err; +} + +OSStatus ca_unlock_device(AudioDeviceID device, pid_t *pid) { + if (*pid == getpid()) { + *pid = -1; + return SetAudioProperty(device, kAudioDevicePropertyHogMode, + sizeof(*pid), &pid); + } + return noErr; +} + +static OSStatus ca_change_mixing(AudioDeviceID device, uint32_t val, + bool *changed) { + *changed = false; + + AudioObjectPropertyAddress p_addr = (AudioObjectPropertyAddress) { + .mSelector = kAudioDevicePropertySupportsMixing, + .mScope = kAudioObjectPropertyScopeGlobal, + .mElement = kAudioObjectPropertyElementMaster, + }; + + if (AudioObjectHasProperty(device, &p_addr)) { + OSStatus err; + Boolean writeable = 0; + err = IsAudioPropertySettable(device, kAudioDevicePropertySupportsMixing, + &writeable); + + if (!CHECK_CA_WARN("can't tell if mixing property is settable")) { + return err; + } + + if (!writeable) + return noErr; + + err = SetAudioProperty(device, kAudioDevicePropertySupportsMixing, + sizeof(uint32_t), &val); + if (err != noErr) + return err; + + if (!CHECK_CA_WARN("can't set mix mode")) { + return err; + } + + *changed = true; + } + + return noErr; +} + +OSStatus ca_disable_mixing(AudioDeviceID device, bool *changed) { + return ca_change_mixing(device, 0, changed); +} + +OSStatus ca_enable_mixing(AudioDeviceID device, bool changed) { + if (changed) { + bool dont_care = false; + return ca_change_mixing(device, 1, &dont_care); + } + + return noErr; +} + +static OSStatus ca_change_device_listening(AudioDeviceID device, + void *flag, bool enabled) +{ + AudioObjectPropertyAddress p_addr = (AudioObjectPropertyAddress) { + .mSelector = kAudioDevicePropertyDeviceHasChanged, + .mScope = kAudioObjectPropertyScopeGlobal, + .mElement = kAudioObjectPropertyElementMaster, + }; + + if (enabled) { + return AudioObjectAddPropertyListener( + device, &p_addr, ca_device_listener, flag); + } else { + return AudioObjectRemovePropertyListener( + device, &p_addr, ca_device_listener, flag); + } +} + +OSStatus ca_enable_device_listener(AudioDeviceID device, void *flag) { + return ca_change_device_listening(device, flag, true); +} + +OSStatus ca_disable_device_listener(AudioDeviceID device, void *flag) { + return ca_change_device_listening(device, flag, false); +} + +int AudioStreamChangeFormat(AudioStreamID i_stream_id, + AudioStreamBasicDescription change_format) +{ + OSStatus err = noErr; + AudioObjectPropertyAddress p_addr; + volatile int stream_format_changed = 0; + + ca_print_asbd("setting stream format:", &change_format); + + /* Install the callback. */ + p_addr = (AudioObjectPropertyAddress) { + .mSelector = kAudioStreamPropertyPhysicalFormat, + .mScope = kAudioObjectPropertyScopeGlobal, + .mElement = kAudioObjectPropertyElementMaster, + }; + + err = AudioObjectAddPropertyListener(i_stream_id, + &p_addr, + ca_stream_listener, + (void *)&stream_format_changed); + if (!CHECK_CA_WARN("can't add property listener during format change")) { + return CONTROL_FALSE; + } + + /* Change the format. */ + err = SetAudioProperty(i_stream_id, + kAudioStreamPropertyPhysicalFormat, + sizeof(AudioStreamBasicDescription), &change_format); + if (!CHECK_CA_WARN("error changing physical format")) { + return CONTROL_FALSE; + } + + /* The AudioStreamSetProperty is not only asynchronious, + * it is also not Atomic, in its behaviour. + * Therefore we check 5 times before we really give up. */ + bool format_set = CONTROL_FALSE; + for (int i = 0; !format_set && i < 5; i++) { + for (int j = 0; !stream_format_changed && j < 50; j++) + mp_sleep_us(10000); + + if (stream_format_changed) { + stream_format_changed = 0; + } else { + ca_msg(MSGL_V, "reached timeout\n"); + } + + AudioStreamBasicDescription actual_format; + err = CA_GET(i_stream_id, kAudioStreamPropertyPhysicalFormat, &actual_format); + + ca_print_asbd("actual format in use:", &actual_format); + if (actual_format.mSampleRate == change_format.mSampleRate && + actual_format.mFormatID == change_format.mFormatID && + actual_format.mFramesPerPacket == change_format.mFramesPerPacket) { + format_set = CONTROL_TRUE; + } + } + + err = AudioObjectRemovePropertyListener(i_stream_id, + &p_addr, + ca_stream_listener, + (void *)&stream_format_changed); + + if (!CHECK_CA_WARN("can't remove property listener")) { + return CONTROL_FALSE; + } + + return format_set; +} |