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libc: allow sample rate change via SNDCTL

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Allow the current VFS OSS plugin to requested different sample rates.

Issue #5167.
This commit is contained in:
Josef Söntgen 2024-04-04 13:25:07 +02:00 committed by Christian Helmuth
parent d0aa8362db
commit 49548fea07
1 changed files with 36 additions and 10 deletions
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46
repos/libports/src/lib/libc/vfs_plugin.cc
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@ -1724,31 +1724,57 @@ Libc::Vfs_plugin::_ioctl_sndctl(File_descriptor *fd, unsigned long request, char
if (!argp) return { true, EINVAL };
int const sample_rate = *(int const *)argp;
if (sample_rate < 0)
return { true, EINVAL };
bool legacy_oss = false;
monitor().monitor([&] {
_with_info(*fd, [&] (Xml_node info) {
if (info.type() != "oss") return;
/* assume legacy if version is not set, current is 2 */
legacy_oss = info.attribute_value("plugin_version", 1U) == 1U;
});
return Fn::COMPLETE;
});
if (!legacy_oss) {
char sample_rate_string[8] { };
::snprintf(sample_rate_string, sizeof(sample_rate_string), "%u", sample_rate);
Absolute_path sample_rate_path = ioctl_dir(*fd);
sample_rate_path.append_element("sample_rate");
File_descriptor *sample_rate_fd = open(sample_rate_path.base(), O_RDWR);
if (!sample_rate_fd)
return { true, ENOTSUP };
write(sample_rate_fd, sample_rate_string, sizeof(sample_rate_string));
close(sample_rate_fd);
}
monitor().monitor([&] {
_with_info(*fd, [&] (Xml_node info) {
if (info.type() != "oss") {
return;
}
unsigned int const samplerate =
unsigned int const got_sample_rate =
info.attribute_value("sample_rate", 0U);
if (samplerate == 0U) {
if (got_sample_rate == 0U) {
result = EINVAL;
return;
}
int const speed = *(int const *)argp;
if (speed < 0) {
result = EINVAL;
return;
}
if ((unsigned)speed != samplerate) {
if ((unsigned)sample_rate != got_sample_rate) {
result = ENOTSUP;
return;
}
*(int *)argp = samplerate;
*(int *)argp = got_sample_rate;
handled = true;
});