From ea5b901bcce20949a8d1fd622a7b03ff6f56ae20 Mon Sep 17 00:00:00 2001 From: Max Kellermann Date: Thu, 23 Jan 2014 23:49:50 +0100 Subject: output/*: move to output/plugins/ --- src/output/plugins/AoOutputPlugin.cxx | 286 ++++++++++++++++++++++++++++++++++ 1 file changed, 286 insertions(+) create mode 100644 src/output/plugins/AoOutputPlugin.cxx (limited to 'src/output/plugins/AoOutputPlugin.cxx') diff --git a/src/output/plugins/AoOutputPlugin.cxx b/src/output/plugins/AoOutputPlugin.cxx new file mode 100644 index 000000000..efc1e0c6e --- /dev/null +++ b/src/output/plugins/AoOutputPlugin.cxx @@ -0,0 +1,286 @@ +/* + * 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 "AoOutputPlugin.hxx" +#include "../OutputAPI.hxx" +#include "util/Error.hxx" +#include "util/Domain.hxx" +#include "Log.hxx" + +#include +#include + +#include + +/* An ao_sample_format, with all fields set to zero: */ +static ao_sample_format OUR_AO_FORMAT_INITIALIZER; + +static unsigned ao_output_ref; + +struct AoOutput { + struct audio_output base; + + size_t write_size; + int driver; + ao_option *options; + ao_device *device; + + bool Initialize(const config_param ¶m, Error &error) { + return ao_base_init(&base, &ao_output_plugin, param, + error); + } + + void Deinitialize() { + ao_base_finish(&base); + } + + bool Configure(const config_param ¶m, Error &error); +}; + +static constexpr Domain ao_output_domain("ao_output"); + +static void +ao_output_error(Error &error_r) +{ + const char *error; + + switch (errno) { + case AO_ENODRIVER: + error = "No such libao driver"; + break; + + case AO_ENOTLIVE: + error = "This driver is not a libao live device"; + break; + + case AO_EBADOPTION: + error = "Invalid libao option"; + break; + + case AO_EOPENDEVICE: + error = "Cannot open the libao device"; + break; + + case AO_EFAIL: + error = "Generic libao failure"; + break; + + default: + error_r.SetErrno(); + return; + } + + error_r.Set(ao_output_domain, errno, error); +} + +inline bool +AoOutput::Configure(const config_param ¶m, Error &error) +{ + const char *value; + + options = nullptr; + + write_size = param.GetBlockValue("write_size", 1024u); + + if (ao_output_ref == 0) { + ao_initialize(); + } + ao_output_ref++; + + value = param.GetBlockValue("driver", "default"); + if (0 == strcmp(value, "default")) + driver = ao_default_driver_id(); + else + driver = ao_driver_id(value); + + if (driver < 0) { + error.Format(ao_output_domain, + "\"%s\" is not a valid ao driver", + value); + return false; + } + + ao_info *ai = ao_driver_info(driver); + if (ai == nullptr) { + error.Set(ao_output_domain, "problems getting driver info"); + return false; + } + + FormatDebug(ao_output_domain, "using ao driver \"%s\" for \"%s\"\n", + ai->short_name, param.GetBlockValue("name", nullptr)); + + value = param.GetBlockValue("options", nullptr); + if (value != nullptr) { + gchar **_options = g_strsplit(value, ";", 0); + + for (unsigned i = 0; _options[i] != nullptr; ++i) { + gchar **key_value = g_strsplit(_options[i], "=", 2); + + if (key_value[0] == nullptr || key_value[1] == nullptr) { + error.Format(ao_output_domain, + "problems parsing options \"%s\"", + _options[i]); + return false; + } + + ao_append_option(&options, key_value[0], + key_value[1]); + + g_strfreev(key_value); + } + + g_strfreev(_options); + } + + return true; +} + +static struct audio_output * +ao_output_init(const config_param ¶m, Error &error) +{ + AoOutput *ad = new AoOutput(); + + if (!ad->Initialize(param, error)) { + delete ad; + return nullptr; + } + + if (!ad->Configure(param, error)) { + ad->Deinitialize(); + delete ad; + return nullptr; + } + + return &ad->base; +} + +static void +ao_output_finish(struct audio_output *ao) +{ + AoOutput *ad = (AoOutput *)ao; + + ao_free_options(ad->options); + ad->Deinitialize(); + delete ad; + + ao_output_ref--; + + if (ao_output_ref == 0) + ao_shutdown(); +} + +static void +ao_output_close(struct audio_output *ao) +{ + AoOutput *ad = (AoOutput *)ao; + + ao_close(ad->device); +} + +static bool +ao_output_open(struct audio_output *ao, AudioFormat &audio_format, + Error &error) +{ + ao_sample_format format = OUR_AO_FORMAT_INITIALIZER; + AoOutput *ad = (AoOutput *)ao; + + switch (audio_format.format) { + case SampleFormat::S8: + format.bits = 8; + break; + + case SampleFormat::S16: + format.bits = 16; + break; + + default: + /* support for 24 bit samples in libao is currently + dubious, and until we have sorted that out, + convert everything to 16 bit */ + audio_format.format = SampleFormat::S16; + format.bits = 16; + break; + } + + format.rate = audio_format.sample_rate; + format.byte_format = AO_FMT_NATIVE; + format.channels = audio_format.channels; + + ad->device = ao_open_live(ad->driver, &format, ad->options); + + if (ad->device == nullptr) { + ao_output_error(error); + return false; + } + + return true; +} + +/** + * For whatever reason, libao wants a non-const pointer. Let's hope + * it does not write to the buffer, and use the union deconst hack to + * work around this API misdesign. + */ +static int ao_play_deconst(ao_device *device, const void *output_samples, + uint_32 num_bytes) +{ + union { + const void *in; + char *out; + } u; + + u.in = output_samples; + return ao_play(device, u.out, num_bytes); +} + +static size_t +ao_output_play(struct audio_output *ao, const void *chunk, size_t size, + Error &error) +{ + AoOutput *ad = (AoOutput *)ao; + + if (size > ad->write_size) + size = ad->write_size; + + if (ao_play_deconst(ad->device, chunk, size) == 0) { + ao_output_error(error); + return 0; + } + + return size; +} + +const struct audio_output_plugin ao_output_plugin = { + "ao", + nullptr, + ao_output_init, + ao_output_finish, + nullptr, + nullptr, + ao_output_open, + ao_output_close, + nullptr, + nullptr, + ao_output_play, + nullptr, + nullptr, + nullptr, + nullptr, +}; -- cgit v1.2.3