diff options
Diffstat (limited to '')
-rw-r--r-- | src/decoder/DecoderThread.cxx | 481 |
1 files changed, 481 insertions, 0 deletions
diff --git a/src/decoder/DecoderThread.cxx b/src/decoder/DecoderThread.cxx new file mode 100644 index 000000000..3f4f7c42e --- /dev/null +++ b/src/decoder/DecoderThread.cxx @@ -0,0 +1,481 @@ +/* + * 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 "DecoderThread.hxx" +#include "DecoderControl.hxx" +#include "DecoderInternal.hxx" +#include "DecoderError.hxx" +#include "DecoderPlugin.hxx" +#include "DetachedSong.hxx" +#include "system/FatalError.hxx" +#include "fs/Traits.hxx" +#include "fs/AllocatedPath.hxx" +#include "DecoderAPI.hxx" +#include "input/InputStream.hxx" +#include "DecoderList.hxx" +#include "util/UriUtil.hxx" +#include "util/Error.hxx" +#include "util/Domain.hxx" +#include "thread/Name.hxx" +#include "tag/ApeReplayGain.hxx" +#include "Log.hxx" + +#include <functional> + +static constexpr Domain decoder_thread_domain("decoder_thread"); + +/** + * Marks the current decoder command as "finished" and notifies the + * player thread. + * + * @param dc the #DecoderControl object; must be locked + */ +static void +decoder_command_finished_locked(DecoderControl &dc) +{ + assert(dc.command != DecoderCommand::NONE); + + dc.command = DecoderCommand::NONE; + + dc.client_cond.signal(); +} + +/** + * Opens the input stream with input_stream::Open(), and waits until + * the stream gets ready. If a decoder STOP command is received + * during that, it cancels the operation (but does not close the + * stream). + * + * Unlock the decoder before calling this function. + * + * @return an input_stream on success or if #DecoderCommand::STOP is + * received, nullptr on error + */ +static InputStream * +decoder_input_stream_open(DecoderControl &dc, const char *uri) +{ + Error error; + + InputStream *is = InputStream::Open(uri, dc.mutex, dc.cond, error); + if (is == nullptr) { + if (error.IsDefined()) + LogError(error); + + return nullptr; + } + + /* wait for the input stream to become ready; its metadata + will be available then */ + + dc.Lock(); + + is->Update(); + while (!is->IsReady() && + dc.command != DecoderCommand::STOP) { + dc.Wait(); + + is->Update(); + } + + if (!is->Check(error)) { + dc.Unlock(); + + LogError(error); + return nullptr; + } + + dc.Unlock(); + + return is; +} + +static bool +decoder_stream_decode(const DecoderPlugin &plugin, + Decoder &decoder, + InputStream &input_stream) +{ + assert(plugin.stream_decode != nullptr); + assert(decoder.stream_tag == nullptr); + assert(decoder.decoder_tag == nullptr); + assert(input_stream.IsReady()); + assert(decoder.dc.state == DecoderState::START); + + FormatDebug(decoder_thread_domain, "probing plugin %s", plugin.name); + + if (decoder.dc.command == DecoderCommand::STOP) + return true; + + /* rewind the stream, so each plugin gets a fresh start */ + input_stream.Rewind(IgnoreError()); + + decoder.dc.Unlock(); + + FormatThreadName("decoder:%s", plugin.name); + + plugin.StreamDecode(decoder, input_stream); + + SetThreadName("decoder"); + + decoder.dc.Lock(); + + assert(decoder.dc.state == DecoderState::START || + decoder.dc.state == DecoderState::DECODE); + + return decoder.dc.state != DecoderState::START; +} + +static bool +decoder_file_decode(const DecoderPlugin &plugin, + Decoder &decoder, Path path) +{ + assert(plugin.file_decode != nullptr); + assert(decoder.stream_tag == nullptr); + assert(decoder.decoder_tag == nullptr); + assert(!path.IsNull()); + assert(path.IsAbsolute()); + assert(decoder.dc.state == DecoderState::START); + + FormatDebug(decoder_thread_domain, "probing plugin %s", plugin.name); + + if (decoder.dc.command == DecoderCommand::STOP) + return true; + + decoder.dc.Unlock(); + + FormatThreadName("decoder:%s", plugin.name); + + plugin.FileDecode(decoder, path); + + SetThreadName("decoder"); + + decoder.dc.Lock(); + + assert(decoder.dc.state == DecoderState::START || + decoder.dc.state == DecoderState::DECODE); + + return decoder.dc.state != DecoderState::START; +} + +gcc_pure +static bool +decoder_check_plugin_mime(const DecoderPlugin &plugin, const InputStream &is) +{ + assert(plugin.stream_decode != nullptr); + + const char *mime_type = is.GetMimeType(); + return mime_type != nullptr && plugin.SupportsMimeType(mime_type); +} + +gcc_pure +static bool +decoder_check_plugin_suffix(const DecoderPlugin &plugin, const char *suffix) +{ + assert(plugin.stream_decode != nullptr); + + return suffix != nullptr && plugin.SupportsSuffix(suffix); +} + +gcc_pure +static bool +decoder_check_plugin(const DecoderPlugin &plugin, const InputStream &is, + const char *suffix) +{ + return plugin.stream_decode != nullptr && + (decoder_check_plugin_mime(plugin, is) || + decoder_check_plugin_suffix(plugin, suffix)); +} + +static bool +decoder_run_stream_plugin(Decoder &decoder, InputStream &is, + const char *suffix, + const DecoderPlugin &plugin, + bool &tried_r) +{ + if (!decoder_check_plugin(plugin, is, suffix)) + return false; + + tried_r = true; + return decoder_stream_decode(plugin, decoder, is); +} + +static bool +decoder_run_stream_locked(Decoder &decoder, InputStream &is, + const char *uri, bool &tried_r) +{ + const char *const suffix = uri_get_suffix(uri); + + using namespace std::placeholders; + const auto f = std::bind(decoder_run_stream_plugin, + std::ref(decoder), std::ref(is), suffix, + _1, std::ref(tried_r)); + return decoder_plugins_try(f); +} + +/** + * Try decoding a stream, using the fallback plugin. + */ +static bool +decoder_run_stream_fallback(Decoder &decoder, InputStream &is) +{ + const struct DecoderPlugin *plugin; + + plugin = decoder_plugin_from_name("mad"); + return plugin != nullptr && plugin->stream_decode != nullptr && + decoder_stream_decode(*plugin, decoder, is); +} + +/** + * Try decoding a stream. + */ +static bool +decoder_run_stream(Decoder &decoder, const char *uri) +{ + DecoderControl &dc = decoder.dc; + InputStream *input_stream; + bool success; + + dc.Unlock(); + + input_stream = decoder_input_stream_open(dc, uri); + if (input_stream == nullptr) { + dc.Lock(); + return false; + } + + dc.Lock(); + + bool tried = false; + success = dc.command == DecoderCommand::STOP || + decoder_run_stream_locked(decoder, *input_stream, uri, + tried) || + /* fallback to mp3: this is needed for bastard streams + that don't have a suffix or set the mimeType */ + (!tried && + decoder_run_stream_fallback(decoder, *input_stream)); + + dc.Unlock(); + delete input_stream; + dc.Lock(); + + return success; +} + +/** + * Attempt to load replay gain data, and pass it to + * decoder_replay_gain(). + */ +static void +decoder_load_replay_gain(Decoder &decoder, Path path_fs) +{ + ReplayGainInfo info; + if (replay_gain_ape_read(path_fs, info)) + decoder_replay_gain(decoder, &info); +} + +static bool +TryDecoderFile(Decoder &decoder, Path path_fs, const char *suffix, + const DecoderPlugin &plugin) +{ + if (!plugin.SupportsSuffix(suffix)) + return false; + + DecoderControl &dc = decoder.dc; + + if (plugin.file_decode != nullptr) { + dc.Lock(); + + if (decoder_file_decode(plugin, decoder, path_fs)) + return true; + + dc.Unlock(); + } else if (plugin.stream_decode != nullptr) { + InputStream *input_stream = + decoder_input_stream_open(dc, path_fs.c_str()); + if (input_stream == nullptr) + return false; + + dc.Lock(); + + bool success = decoder_stream_decode(plugin, decoder, + *input_stream); + + dc.Unlock(); + + delete input_stream; + + if (success) { + dc.Lock(); + return true; + } + } + + return false; +} + +/** + * Try decoding a file. + */ +static bool +decoder_run_file(Decoder &decoder, const char *uri_utf8, Path path_fs) +{ + const char *suffix = uri_get_suffix(uri_utf8); + if (suffix == nullptr) + return false; + + DecoderControl &dc = decoder.dc; + dc.Unlock(); + + decoder_load_replay_gain(decoder, path_fs); + + if (decoder_plugins_try([&decoder, path_fs, + suffix](const DecoderPlugin &plugin){ + return TryDecoderFile(decoder, + path_fs, suffix, + plugin); + })) + return true; + + dc.Lock(); + return false; +} + +static void +decoder_run_song(DecoderControl &dc, + const DetachedSong &song, const char *uri, Path path_fs) +{ + Decoder decoder(dc, dc.start_time.IsPositive(), + new Tag(song.GetTag())); + int ret; + + dc.state = DecoderState::START; + + decoder_command_finished_locked(dc); + + ret = !path_fs.IsNull() + ? decoder_run_file(decoder, uri, path_fs) + : decoder_run_stream(decoder, uri); + + dc.Unlock(); + + /* flush the last chunk */ + + if (decoder.chunk != nullptr) + decoder.FlushChunk(); + + dc.Lock(); + + if (decoder.error.IsDefined()) { + /* copy the Error from sruct Decoder to + DecoderControl */ + dc.state = DecoderState::ERROR; + dc.error = std::move(decoder.error); + } else if (ret) + dc.state = DecoderState::STOP; + else { + dc.state = DecoderState::ERROR; + + const char *error_uri = song.GetURI(); + const std::string allocated = uri_remove_auth(error_uri); + if (!allocated.empty()) + error_uri = allocated.c_str(); + + dc.error.Format(decoder_domain, + "Failed to decode %s", error_uri); + } + + dc.client_cond.signal(); +} + +static void +decoder_run(DecoderControl &dc) +{ + dc.ClearError(); + + assert(dc.song != nullptr); + const DetachedSong &song = *dc.song; + + const char *const uri_utf8 = song.GetRealURI(); + + Path path_fs = Path::Null(); + AllocatedPath path_buffer = AllocatedPath::Null(); + if (PathTraitsUTF8::IsAbsolute(uri_utf8)) { + path_buffer = AllocatedPath::FromUTF8(uri_utf8, dc.error); + if (path_buffer.IsNull()) { + dc.state = DecoderState::ERROR; + decoder_command_finished_locked(dc); + return; + } + + path_fs = path_buffer; + } + + decoder_run_song(dc, song, uri_utf8, path_fs); + +} + +static void +decoder_task(void *arg) +{ + DecoderControl &dc = *(DecoderControl *)arg; + + SetThreadName("decoder"); + + dc.Lock(); + + do { + assert(dc.state == DecoderState::STOP || + dc.state == DecoderState::ERROR); + + switch (dc.command) { + case DecoderCommand::START: + dc.CycleMixRamp(); + dc.replay_gain_prev_db = dc.replay_gain_db; + dc.replay_gain_db = 0; + + /* fall through */ + + case DecoderCommand::SEEK: + decoder_run(dc); + break; + + case DecoderCommand::STOP: + decoder_command_finished_locked(dc); + break; + + case DecoderCommand::NONE: + dc.Wait(); + break; + } + } while (dc.command != DecoderCommand::NONE || !dc.quit); + + dc.Unlock(); +} + +void +decoder_thread_start(DecoderControl &dc) +{ + assert(!dc.thread.IsDefined()); + + dc.quit = false; + + Error error; + if (!dc.thread.Start(decoder_task, &dc, error)) + FatalError(error); +} |