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-rw-r--r--src/output/plugins/OssOutputPlugin.cxx772
1 files changed, 772 insertions, 0 deletions
diff --git a/src/output/plugins/OssOutputPlugin.cxx b/src/output/plugins/OssOutputPlugin.cxx
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index 000000000..05b14b29f
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+++ b/src/output/plugins/OssOutputPlugin.cxx
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+/*
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program 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.
+ *
+ * This program 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 this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "config.h"
+#include "OssOutputPlugin.hxx"
+#include "../OutputAPI.hxx"
+#include "mixer/MixerList.hxx"
+#include "system/fd_util.h"
+#include "util/Error.hxx"
+#include "util/Domain.hxx"
+#include "util/Macros.hxx"
+#include "system/ByteOrder.hxx"
+#include "Log.hxx"
+
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <assert.h>
+
+#if defined(__OpenBSD__) || defined(__NetBSD__)
+# include <soundcard.h>
+#else /* !(defined(__OpenBSD__) || defined(__NetBSD__) */
+# include <sys/soundcard.h>
+#endif /* !(defined(__OpenBSD__) || defined(__NetBSD__) */
+
+/* We got bug reports from FreeBSD users who said that the two 24 bit
+ formats generate white noise on FreeBSD, but 32 bit works. This is
+ a workaround until we know what exactly is expected by the kernel
+ audio drivers. */
+#ifndef __linux__
+#undef AFMT_S24_PACKED
+#undef AFMT_S24_NE
+#endif
+
+#ifdef AFMT_S24_PACKED
+#include "pcm/PcmExport.hxx"
+#include "util/Manual.hxx"
+#endif
+
+struct OssOutput {
+ AudioOutput base;
+
+#ifdef AFMT_S24_PACKED
+ Manual<PcmExport> pcm_export;
+#endif
+
+ int fd;
+ const char *device;
+
+ /**
+ * The current input audio format. This is needed to reopen
+ * the device after cancel().
+ */
+ AudioFormat audio_format;
+
+ /**
+ * The current OSS audio format. This is needed to reopen the
+ * device after cancel().
+ */
+ int oss_format;
+
+ OssOutput()
+ :base(oss_output_plugin),
+ fd(-1), device(nullptr) {}
+
+ bool Initialize(const config_param &param, Error &error_r) {
+ return base.Configure(param, error_r);
+ }
+};
+
+static constexpr Domain oss_output_domain("oss_output");
+
+enum oss_stat {
+ OSS_STAT_NO_ERROR = 0,
+ OSS_STAT_NOT_CHAR_DEV = -1,
+ OSS_STAT_NO_PERMS = -2,
+ OSS_STAT_DOESN_T_EXIST = -3,
+ OSS_STAT_OTHER = -4,
+};
+
+static enum oss_stat
+oss_stat_device(const char *device, int *errno_r)
+{
+ struct stat st;
+
+ if (0 == stat(device, &st)) {
+ if (!S_ISCHR(st.st_mode)) {
+ return OSS_STAT_NOT_CHAR_DEV;
+ }
+ } else {
+ *errno_r = errno;
+
+ switch (errno) {
+ case ENOENT:
+ case ENOTDIR:
+ return OSS_STAT_DOESN_T_EXIST;
+ case EACCES:
+ return OSS_STAT_NO_PERMS;
+ default:
+ return OSS_STAT_OTHER;
+ }
+ }
+
+ return OSS_STAT_NO_ERROR;
+}
+
+static const char *default_devices[] = { "/dev/sound/dsp", "/dev/dsp" };
+
+static bool
+oss_output_test_default_device(void)
+{
+ int fd, i;
+
+ for (i = ARRAY_SIZE(default_devices); --i >= 0; ) {
+ fd = open_cloexec(default_devices[i], O_WRONLY, 0);
+
+ if (fd >= 0) {
+ close(fd);
+ return true;
+ }
+
+ FormatErrno(oss_output_domain,
+ "Error opening OSS device \"%s\"",
+ default_devices[i]);
+ }
+
+ return false;
+}
+
+static AudioOutput *
+oss_open_default(Error &error)
+{
+ int err[ARRAY_SIZE(default_devices)];
+ enum oss_stat ret[ARRAY_SIZE(default_devices)];
+
+ const config_param empty;
+ for (int i = ARRAY_SIZE(default_devices); --i >= 0; ) {
+ ret[i] = oss_stat_device(default_devices[i], &err[i]);
+ if (ret[i] == OSS_STAT_NO_ERROR) {
+ OssOutput *od = new OssOutput();
+ if (!od->Initialize(empty, error)) {
+ delete od;
+ return NULL;
+ }
+
+ od->device = default_devices[i];
+ return &od->base;
+ }
+ }
+
+ for (int i = ARRAY_SIZE(default_devices); --i >= 0; ) {
+ const char *dev = default_devices[i];
+ switch(ret[i]) {
+ case OSS_STAT_NO_ERROR:
+ /* never reached */
+ break;
+ case OSS_STAT_DOESN_T_EXIST:
+ FormatWarning(oss_output_domain,
+ "%s not found", dev);
+ break;
+ case OSS_STAT_NOT_CHAR_DEV:
+ FormatWarning(oss_output_domain,
+ "%s is not a character device", dev);
+ break;
+ case OSS_STAT_NO_PERMS:
+ FormatWarning(oss_output_domain,
+ "%s: permission denied", dev);
+ break;
+ case OSS_STAT_OTHER:
+ FormatErrno(oss_output_domain, err[i],
+ "Error accessing %s", dev);
+ }
+ }
+
+ error.Set(oss_output_domain,
+ "error trying to open default OSS device");
+ return NULL;
+}
+
+static AudioOutput *
+oss_output_init(const config_param &param, Error &error)
+{
+ const char *device = param.GetBlockValue("device");
+ if (device != NULL) {
+ OssOutput *od = new OssOutput();
+ if (!od->Initialize(param, error)) {
+ delete od;
+ return NULL;
+ }
+
+ od->device = device;
+ return &od->base;
+ }
+
+ return oss_open_default(error);
+}
+
+static void
+oss_output_finish(AudioOutput *ao)
+{
+ OssOutput *od = (OssOutput *)ao;
+
+ delete od;
+}
+
+#ifdef AFMT_S24_PACKED
+
+static bool
+oss_output_enable(AudioOutput *ao, gcc_unused Error &error)
+{
+ OssOutput *od = (OssOutput *)ao;
+
+ od->pcm_export.Construct();
+ return true;
+}
+
+static void
+oss_output_disable(AudioOutput *ao)
+{
+ OssOutput *od = (OssOutput *)ao;
+
+ od->pcm_export.Destruct();
+}
+
+#endif
+
+static void
+oss_close(OssOutput *od)
+{
+ if (od->fd >= 0)
+ close(od->fd);
+ od->fd = -1;
+}
+
+/**
+ * A tri-state type for oss_try_ioctl().
+ */
+enum oss_setup_result {
+ SUCCESS,
+ ERROR,
+ UNSUPPORTED,
+};
+
+/**
+ * Invoke an ioctl on the OSS file descriptor. On success, SUCCESS is
+ * returned. If the parameter is not supported, UNSUPPORTED is
+ * returned. Any other failure returns ERROR and allocates an #Error.
+ */
+static enum oss_setup_result
+oss_try_ioctl_r(int fd, unsigned long request, int *value_r,
+ const char *msg, Error &error)
+{
+ assert(fd >= 0);
+ assert(value_r != NULL);
+ assert(msg != NULL);
+ assert(!error.IsDefined());
+
+ int ret = ioctl(fd, request, value_r);
+ if (ret >= 0)
+ return SUCCESS;
+
+ if (errno == EINVAL)
+ return UNSUPPORTED;
+
+ error.SetErrno(msg);
+ return ERROR;
+}
+
+/**
+ * Invoke an ioctl on the OSS file descriptor. On success, SUCCESS is
+ * returned. If the parameter is not supported, UNSUPPORTED is
+ * returned. Any other failure returns ERROR and allocates an #Error.
+ */
+static enum oss_setup_result
+oss_try_ioctl(int fd, unsigned long request, int value,
+ const char *msg, Error &error_r)
+{
+ return oss_try_ioctl_r(fd, request, &value, msg, error_r);
+}
+
+/**
+ * Set up the channel number, and attempts to find alternatives if the
+ * specified number is not supported.
+ */
+static bool
+oss_setup_channels(int fd, AudioFormat &audio_format, Error &error)
+{
+ const char *const msg = "Failed to set channel count";
+ int channels = audio_format.channels;
+ enum oss_setup_result result =
+ oss_try_ioctl_r(fd, SNDCTL_DSP_CHANNELS, &channels, msg, error);
+ switch (result) {
+ case SUCCESS:
+ if (!audio_valid_channel_count(channels))
+ break;
+
+ audio_format.channels = channels;
+ return true;
+
+ case ERROR:
+ return false;
+
+ case UNSUPPORTED:
+ break;
+ }
+
+ for (unsigned i = 1; i < 2; ++i) {
+ if (i == audio_format.channels)
+ /* don't try that again */
+ continue;
+
+ channels = i;
+ result = oss_try_ioctl_r(fd, SNDCTL_DSP_CHANNELS, &channels,
+ msg, error);
+ switch (result) {
+ case SUCCESS:
+ if (!audio_valid_channel_count(channels))
+ break;
+
+ audio_format.channels = channels;
+ return true;
+
+ case ERROR:
+ return false;
+
+ case UNSUPPORTED:
+ break;
+ }
+ }
+
+ error.Set(oss_output_domain, msg);
+ return false;
+}
+
+/**
+ * Set up the sample rate, and attempts to find alternatives if the
+ * specified sample rate is not supported.
+ */
+static bool
+oss_setup_sample_rate(int fd, AudioFormat &audio_format,
+ Error &error)
+{
+ const char *const msg = "Failed to set sample rate";
+ int sample_rate = audio_format.sample_rate;
+ enum oss_setup_result result =
+ oss_try_ioctl_r(fd, SNDCTL_DSP_SPEED, &sample_rate,
+ msg, error);
+ switch (result) {
+ case SUCCESS:
+ if (!audio_valid_sample_rate(sample_rate))
+ break;
+
+ audio_format.sample_rate = sample_rate;
+ return true;
+
+ case ERROR:
+ return false;
+
+ case UNSUPPORTED:
+ break;
+ }
+
+ static const int sample_rates[] = { 48000, 44100, 0 };
+ for (unsigned i = 0; sample_rates[i] != 0; ++i) {
+ sample_rate = sample_rates[i];
+ if (sample_rate == (int)audio_format.sample_rate)
+ continue;
+
+ result = oss_try_ioctl_r(fd, SNDCTL_DSP_SPEED, &sample_rate,
+ msg, error);
+ switch (result) {
+ case SUCCESS:
+ if (!audio_valid_sample_rate(sample_rate))
+ break;
+
+ audio_format.sample_rate = sample_rate;
+ return true;
+
+ case ERROR:
+ return false;
+
+ case UNSUPPORTED:
+ break;
+ }
+ }
+
+ error.Set(oss_output_domain, msg);
+ return false;
+}
+
+/**
+ * Convert a MPD sample format to its OSS counterpart. Returns
+ * AFMT_QUERY if there is no direct counterpart.
+ */
+static int
+sample_format_to_oss(SampleFormat format)
+{
+ switch (format) {
+ case SampleFormat::UNDEFINED:
+ case SampleFormat::FLOAT:
+ case SampleFormat::DSD:
+ return AFMT_QUERY;
+
+ case SampleFormat::S8:
+ return AFMT_S8;
+
+ case SampleFormat::S16:
+ return AFMT_S16_NE;
+
+ case SampleFormat::S24_P32:
+#ifdef AFMT_S24_NE
+ return AFMT_S24_NE;
+#else
+ return AFMT_QUERY;
+#endif
+
+ case SampleFormat::S32:
+#ifdef AFMT_S32_NE
+ return AFMT_S32_NE;
+#else
+ return AFMT_QUERY;
+#endif
+ }
+
+ return AFMT_QUERY;
+}
+
+/**
+ * Convert an OSS sample format to its MPD counterpart. Returns
+ * SampleFormat::UNDEFINED if there is no direct counterpart.
+ */
+static SampleFormat
+sample_format_from_oss(int format)
+{
+ switch (format) {
+ case AFMT_S8:
+ return SampleFormat::S8;
+
+ case AFMT_S16_NE:
+ return SampleFormat::S16;
+
+#ifdef AFMT_S24_PACKED
+ case AFMT_S24_PACKED:
+ return SampleFormat::S24_P32;
+#endif
+
+#ifdef AFMT_S24_NE
+ case AFMT_S24_NE:
+ return SampleFormat::S24_P32;
+#endif
+
+#ifdef AFMT_S32_NE
+ case AFMT_S32_NE:
+ return SampleFormat::S32;
+#endif
+
+ default:
+ return SampleFormat::UNDEFINED;
+ }
+}
+
+/**
+ * Probe one sample format.
+ *
+ * @return the selected sample format or SampleFormat::UNDEFINED on
+ * error
+ */
+static enum oss_setup_result
+oss_probe_sample_format(int fd, SampleFormat sample_format,
+ SampleFormat *sample_format_r,
+ int *oss_format_r,
+#ifdef AFMT_S24_PACKED
+ PcmExport &pcm_export,
+#endif
+ Error &error)
+{
+ int oss_format = sample_format_to_oss(sample_format);
+ if (oss_format == AFMT_QUERY)
+ return UNSUPPORTED;
+
+ enum oss_setup_result result =
+ oss_try_ioctl_r(fd, SNDCTL_DSP_SAMPLESIZE,
+ &oss_format,
+ "Failed to set sample format", error);
+
+#ifdef AFMT_S24_PACKED
+ if (result == UNSUPPORTED && sample_format == SampleFormat::S24_P32) {
+ /* if the driver doesn't support padded 24 bit, try
+ packed 24 bit */
+ oss_format = AFMT_S24_PACKED;
+ result = oss_try_ioctl_r(fd, SNDCTL_DSP_SAMPLESIZE,
+ &oss_format,
+ "Failed to set sample format", error);
+ }
+#endif
+
+ if (result != SUCCESS)
+ return result;
+
+ sample_format = sample_format_from_oss(oss_format);
+ if (sample_format == SampleFormat::UNDEFINED)
+ return UNSUPPORTED;
+
+ *sample_format_r = sample_format;
+ *oss_format_r = oss_format;
+
+#ifdef AFMT_S24_PACKED
+ pcm_export.Open(sample_format, 0, false, false,
+ oss_format == AFMT_S24_PACKED,
+ oss_format == AFMT_S24_PACKED &&
+ !IsLittleEndian());
+#endif
+
+ return SUCCESS;
+}
+
+/**
+ * Set up the sample format, and attempts to find alternatives if the
+ * specified format is not supported.
+ */
+static bool
+oss_setup_sample_format(int fd, AudioFormat &audio_format,
+ int *oss_format_r,
+#ifdef AFMT_S24_PACKED
+ PcmExport &pcm_export,
+#endif
+ Error &error)
+{
+ SampleFormat mpd_format;
+ enum oss_setup_result result =
+ oss_probe_sample_format(fd, audio_format.format,
+ &mpd_format, oss_format_r,
+#ifdef AFMT_S24_PACKED
+ pcm_export,
+#endif
+ error);
+ switch (result) {
+ case SUCCESS:
+ audio_format.format = mpd_format;
+ return true;
+
+ case ERROR:
+ return false;
+
+ case UNSUPPORTED:
+ break;
+ }
+
+ if (result != UNSUPPORTED)
+ return result == SUCCESS;
+
+ /* the requested sample format is not available - probe for
+ other formats supported by MPD */
+
+ static const SampleFormat sample_formats[] = {
+ SampleFormat::S24_P32,
+ SampleFormat::S32,
+ SampleFormat::S16,
+ SampleFormat::S8,
+ SampleFormat::UNDEFINED /* sentinel */
+ };
+
+ for (unsigned i = 0; sample_formats[i] != SampleFormat::UNDEFINED; ++i) {
+ mpd_format = sample_formats[i];
+ if (mpd_format == audio_format.format)
+ /* don't try that again */
+ continue;
+
+ result = oss_probe_sample_format(fd, mpd_format,
+ &mpd_format, oss_format_r,
+#ifdef AFMT_S24_PACKED
+ pcm_export,
+#endif
+ error);
+ switch (result) {
+ case SUCCESS:
+ audio_format.format = mpd_format;
+ return true;
+
+ case ERROR:
+ return false;
+
+ case UNSUPPORTED:
+ break;
+ }
+ }
+
+ error.Set(oss_output_domain, "Failed to set sample format");
+ return false;
+}
+
+/**
+ * Sets up the OSS device which was opened before.
+ */
+static bool
+oss_setup(OssOutput *od, AudioFormat &audio_format,
+ Error &error)
+{
+ return oss_setup_channels(od->fd, audio_format, error) &&
+ oss_setup_sample_rate(od->fd, audio_format, error) &&
+ oss_setup_sample_format(od->fd, audio_format, &od->oss_format,
+#ifdef AFMT_S24_PACKED
+ od->pcm_export,
+#endif
+ error);
+}
+
+/**
+ * Reopen the device with the saved audio_format, without any probing.
+ */
+static bool
+oss_reopen(OssOutput *od, Error &error)
+{
+ assert(od->fd < 0);
+
+ od->fd = open_cloexec(od->device, O_WRONLY, 0);
+ if (od->fd < 0) {
+ error.FormatErrno("Error opening OSS device \"%s\"",
+ od->device);
+ return false;
+ }
+
+ enum oss_setup_result result;
+
+ const char *const msg1 = "Failed to set channel count";
+ result = oss_try_ioctl(od->fd, SNDCTL_DSP_CHANNELS,
+ od->audio_format.channels, msg1, error);
+ if (result != SUCCESS) {
+ oss_close(od);
+ if (result == UNSUPPORTED)
+ error.Set(oss_output_domain, msg1);
+ return false;
+ }
+
+ const char *const msg2 = "Failed to set sample rate";
+ result = oss_try_ioctl(od->fd, SNDCTL_DSP_SPEED,
+ od->audio_format.sample_rate, msg2, error);
+ if (result != SUCCESS) {
+ oss_close(od);
+ if (result == UNSUPPORTED)
+ error.Set(oss_output_domain, msg2);
+ return false;
+ }
+
+ const char *const msg3 = "Failed to set sample format";
+ result = oss_try_ioctl(od->fd, SNDCTL_DSP_SAMPLESIZE,
+ od->oss_format,
+ msg3, error);
+ if (result != SUCCESS) {
+ oss_close(od);
+ if (result == UNSUPPORTED)
+ error.Set(oss_output_domain, msg3);
+ return false;
+ }
+
+ return true;
+}
+
+static bool
+oss_output_open(AudioOutput *ao, AudioFormat &audio_format,
+ Error &error)
+{
+ OssOutput *od = (OssOutput *)ao;
+
+ od->fd = open_cloexec(od->device, O_WRONLY, 0);
+ if (od->fd < 0) {
+ error.FormatErrno("Error opening OSS device \"%s\"",
+ od->device);
+ return false;
+ }
+
+ if (!oss_setup(od, audio_format, error)) {
+ oss_close(od);
+ return false;
+ }
+
+ od->audio_format = audio_format;
+ return true;
+}
+
+static void
+oss_output_close(AudioOutput *ao)
+{
+ OssOutput *od = (OssOutput *)ao;
+
+ oss_close(od);
+}
+
+static void
+oss_output_cancel(AudioOutput *ao)
+{
+ OssOutput *od = (OssOutput *)ao;
+
+ if (od->fd >= 0) {
+ ioctl(od->fd, SNDCTL_DSP_RESET, 0);
+ oss_close(od);
+ }
+}
+
+static size_t
+oss_output_play(AudioOutput *ao, const void *chunk, size_t size,
+ Error &error)
+{
+ OssOutput *od = (OssOutput *)ao;
+ ssize_t ret;
+
+ /* reopen the device since it was closed by dropBufferedAudio */
+ if (od->fd < 0 && !oss_reopen(od, error))
+ return 0;
+
+#ifdef AFMT_S24_PACKED
+ chunk = od->pcm_export->Export(chunk, size, size);
+#endif
+
+ while (true) {
+ ret = write(od->fd, chunk, size);
+ if (ret > 0) {
+#ifdef AFMT_S24_PACKED
+ ret = od->pcm_export->CalcSourceSize(ret);
+#endif
+ return ret;
+ }
+
+ if (ret < 0 && errno != EINTR) {
+ error.FormatErrno("Write error on %s", od->device);
+ return 0;
+ }
+ }
+}
+
+const struct AudioOutputPlugin oss_output_plugin = {
+ "oss",
+ oss_output_test_default_device,
+ oss_output_init,
+ oss_output_finish,
+#ifdef AFMT_S24_PACKED
+ oss_output_enable,
+ oss_output_disable,
+#else
+ nullptr,
+ nullptr,
+#endif
+ oss_output_open,
+ oss_output_close,
+ nullptr,
+ nullptr,
+ oss_output_play,
+ nullptr,
+ oss_output_cancel,
+ nullptr,
+
+ &oss_mixer_plugin,
+};