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Diffstat (limited to 'src/output/plugins/RecorderOutputPlugin.cxx')
| -rw-r--r-- | src/output/plugins/RecorderOutputPlugin.cxx | 258 |
1 files changed, 258 insertions, 0 deletions
diff --git a/src/output/plugins/RecorderOutputPlugin.cxx b/src/output/plugins/RecorderOutputPlugin.cxx new file mode 100644 index 000000000..87e23f55a --- /dev/null +++ b/src/output/plugins/RecorderOutputPlugin.cxx @@ -0,0 +1,258 @@ +/* + * 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 "RecorderOutputPlugin.hxx" +#include "../OutputAPI.hxx" +#include "encoder/EncoderPlugin.hxx" +#include "encoder/EncoderList.hxx" +#include "config/ConfigError.hxx" +#include "util/Error.hxx" +#include "util/Domain.hxx" +#include "system/fd_util.h" +#include "open.h" + +#include <assert.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <unistd.h> +#include <errno.h> + +struct RecorderOutput { + AudioOutput base; + + /** + * The configured encoder plugin. + */ + Encoder *encoder; + + /** + * The destination file name. + */ + const char *path; + + /** + * The destination file descriptor. + */ + int fd; + + /** + * The buffer for encoder_read(). + */ + char buffer[32768]; + + RecorderOutput() + :base(recorder_output_plugin) {} + + bool Initialize(const config_param ¶m, Error &error_r) { + return base.Configure(param, error_r); + } + + bool Configure(const config_param ¶m, Error &error); + + bool WriteToFile(const void *data, size_t length, Error &error); + + /** + * Writes pending data from the encoder to the output file. + */ + bool EncoderToFile(Error &error); +}; + +static constexpr Domain recorder_output_domain("recorder_output"); + +inline bool +RecorderOutput::Configure(const config_param ¶m, Error &error) +{ + /* read configuration */ + + const char *encoder_name = + param.GetBlockValue("encoder", "vorbis"); + const auto encoder_plugin = encoder_plugin_get(encoder_name); + if (encoder_plugin == nullptr) { + error.Format(config_domain, + "No such encoder: %s", encoder_name); + return false; + } + + path = param.GetBlockValue("path"); + if (path == nullptr) { + error.Set(config_domain, "'path' not configured"); + return false; + } + + /* initialize encoder */ + + encoder = encoder_init(*encoder_plugin, param, error); + if (encoder == nullptr) + return false; + + return true; +} + +static AudioOutput * +recorder_output_init(const config_param ¶m, Error &error) +{ + RecorderOutput *recorder = new RecorderOutput(); + + if (!recorder->Initialize(param, error)) { + delete recorder; + return nullptr; + } + + if (!recorder->Configure(param, error)) { + delete recorder; + return nullptr; + } + + return &recorder->base; +} + +static void +recorder_output_finish(AudioOutput *ao) +{ + RecorderOutput *recorder = (RecorderOutput *)ao; + + encoder_finish(recorder->encoder); + delete recorder; +} + +inline bool +RecorderOutput::WriteToFile(const void *_data, size_t length, Error &error) +{ + assert(length > 0); + + const uint8_t *data = (const uint8_t *)_data, *end = data + length; + + while (true) { + ssize_t nbytes = write(fd, data, end - data); + if (nbytes > 0) { + data += nbytes; + if (data == end) + return true; + } else if (nbytes == 0) { + /* shouldn't happen for files */ + error.Set(recorder_output_domain, + "write() returned 0"); + return false; + } else if (errno != EINTR) { + error.FormatErrno("Failed to write to '%s'", path); + return false; + } + } +} + +inline bool +RecorderOutput::EncoderToFile(Error &error) +{ + assert(fd >= 0); + + while (true) { + /* read from the encoder */ + + size_t size = encoder_read(encoder, buffer, sizeof(buffer)); + if (size == 0) + return true; + + /* write everything into the file */ + + if (!WriteToFile(buffer, size, error)) + return false; + } +} + +static bool +recorder_output_open(AudioOutput *ao, + AudioFormat &audio_format, + Error &error) +{ + RecorderOutput *recorder = (RecorderOutput *)ao; + + /* create the output file */ + + recorder->fd = open_cloexec(recorder->path, + O_CREAT|O_WRONLY|O_TRUNC|O_BINARY, + 0666); + if (recorder->fd < 0) { + error.FormatErrno("Failed to create '%s'", recorder->path); + return false; + } + + /* open the encoder */ + + if (!encoder_open(recorder->encoder, audio_format, error)) { + close(recorder->fd); + unlink(recorder->path); + return false; + } + + if (!recorder->EncoderToFile(error)) { + encoder_close(recorder->encoder); + close(recorder->fd); + unlink(recorder->path); + return false; + } + + return true; +} + +static void +recorder_output_close(AudioOutput *ao) +{ + RecorderOutput *recorder = (RecorderOutput *)ao; + + /* flush the encoder and write the rest to the file */ + + if (encoder_end(recorder->encoder, IgnoreError())) + recorder->EncoderToFile(IgnoreError()); + + /* now really close everything */ + + encoder_close(recorder->encoder); + + close(recorder->fd); +} + +static size_t +recorder_output_play(AudioOutput *ao, const void *chunk, size_t size, + Error &error) +{ + RecorderOutput *recorder = (RecorderOutput *)ao; + + return encoder_write(recorder->encoder, chunk, size, error) && + recorder->EncoderToFile(error) + ? size : 0; +} + +const struct AudioOutputPlugin recorder_output_plugin = { + "recorder", + nullptr, + recorder_output_init, + recorder_output_finish, + nullptr, + nullptr, + recorder_output_open, + recorder_output_close, + nullptr, + nullptr, + recorder_output_play, + nullptr, + nullptr, + nullptr, + nullptr, +}; |