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-rw-r--r--src/decoder/plugins/Mpg123DecoderPlugin.cxx256
1 files changed, 256 insertions, 0 deletions
diff --git a/src/decoder/plugins/Mpg123DecoderPlugin.cxx b/src/decoder/plugins/Mpg123DecoderPlugin.cxx
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index 000000000..76702a08f
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+++ b/src/decoder/plugins/Mpg123DecoderPlugin.cxx
@@ -0,0 +1,256 @@
+/*
+ * 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" /* must be first for large file support */
+#include "Mpg123DecoderPlugin.hxx"
+#include "../DecoderAPI.hxx"
+#include "CheckAudioFormat.hxx"
+#include "tag/TagHandler.hxx"
+#include "fs/Path.hxx"
+#include "util/Error.hxx"
+#include "util/Domain.hxx"
+#include "Log.hxx"
+
+#include <mpg123.h>
+
+#include <stdio.h>
+
+static constexpr Domain mpg123_domain("mpg123");
+
+static bool
+mpd_mpg123_init(gcc_unused const config_param &param)
+{
+ mpg123_init();
+
+ return true;
+}
+
+static void
+mpd_mpg123_finish(void)
+{
+ mpg123_exit();
+}
+
+/**
+ * Opens a file with an existing #mpg123_handle.
+ *
+ * @param handle a handle which was created before; on error, this
+ * function will not free it
+ * @param audio_format this parameter is filled after successful
+ * return
+ * @return true on success
+ */
+static bool
+mpd_mpg123_open(mpg123_handle *handle, const char *path_fs,
+ AudioFormat &audio_format)
+{
+ int error;
+ int channels, encoding;
+ long rate;
+
+ /* mpg123_open() wants a writable string :-( */
+ char *const path2 = const_cast<char *>(path_fs);
+
+ error = mpg123_open(handle, path2);
+ if (error != MPG123_OK) {
+ FormatWarning(mpg123_domain,
+ "libmpg123 failed to open %s: %s",
+ path_fs, mpg123_plain_strerror(error));
+ return false;
+ }
+
+ /* obtain the audio format */
+
+ error = mpg123_getformat(handle, &rate, &channels, &encoding);
+ if (error != MPG123_OK) {
+ FormatWarning(mpg123_domain,
+ "mpg123_getformat() failed: %s",
+ mpg123_plain_strerror(error));
+ return false;
+ }
+
+ if (encoding != MPG123_ENC_SIGNED_16) {
+ /* other formats not yet implemented */
+ FormatWarning(mpg123_domain,
+ "expected MPG123_ENC_SIGNED_16, got %d",
+ encoding);
+ return false;
+ }
+
+ Error error2;
+ if (!audio_format_init_checked(audio_format, rate, SampleFormat::S16,
+ channels, error2)) {
+ LogError(error2);
+ return false;
+ }
+
+ return true;
+}
+
+static void
+mpd_mpg123_file_decode(Decoder &decoder, Path path_fs)
+{
+ mpg123_handle *handle;
+ int error;
+ off_t num_samples;
+ struct mpg123_frameinfo info;
+
+ /* open the file */
+
+ handle = mpg123_new(nullptr, &error);
+ if (handle == nullptr) {
+ FormatError(mpg123_domain,
+ "mpg123_new() failed: %s",
+ mpg123_plain_strerror(error));
+ return;
+ }
+
+ AudioFormat audio_format;
+ if (!mpd_mpg123_open(handle, path_fs.c_str(), audio_format)) {
+ mpg123_delete(handle);
+ return;
+ }
+
+ num_samples = mpg123_length(handle);
+
+ /* tell MPD core we're ready */
+
+ decoder_initialized(decoder, audio_format, true,
+ (float)num_samples /
+ (float)audio_format.sample_rate);
+
+ if (mpg123_info(handle, &info) != MPG123_OK) {
+ info.vbr = MPG123_CBR;
+ info.bitrate = 0;
+ }
+
+ switch (info.vbr) {
+ case MPG123_ABR:
+ info.bitrate = info.abr_rate;
+ break;
+ case MPG123_CBR:
+ break;
+ default:
+ info.bitrate = 0;
+ }
+
+ /* the decoder main loop */
+
+ DecoderCommand cmd;
+ do {
+ unsigned char buffer[8192];
+ size_t nbytes;
+
+ /* decode */
+
+ error = mpg123_read(handle, buffer, sizeof(buffer), &nbytes);
+ if (error != MPG123_OK) {
+ if (error != MPG123_DONE)
+ FormatWarning(mpg123_domain,
+ "mpg123_read() failed: %s",
+ mpg123_plain_strerror(error));
+ break;
+ }
+
+ /* update bitrate for ABR/VBR */
+ if (info.vbr != MPG123_CBR) {
+ /* FIXME: maybe skip, as too expensive? */
+ /* FIXME: maybe, (info.vbr == MPG123_VBR) ? */
+ if (mpg123_info (handle, &info) != MPG123_OK)
+ info.bitrate = 0;
+ }
+
+ /* send to MPD */
+
+ cmd = decoder_data(decoder, nullptr, buffer, nbytes, info.bitrate);
+
+ if (cmd == DecoderCommand::SEEK) {
+ off_t c = decoder_seek_where(decoder)*audio_format.sample_rate;
+ c = mpg123_seek(handle, c, SEEK_SET);
+ if (c < 0)
+ decoder_seek_error(decoder);
+ else {
+ decoder_command_finished(decoder);
+ decoder_timestamp(decoder, c/(double)audio_format.sample_rate);
+ }
+
+ cmd = DecoderCommand::NONE;
+ }
+ } while (cmd == DecoderCommand::NONE);
+
+ /* cleanup */
+
+ mpg123_delete(handle);
+}
+
+static bool
+mpd_mpg123_scan_file(Path path_fs,
+ const struct tag_handler *handler, void *handler_ctx)
+{
+ mpg123_handle *handle;
+ int error;
+ off_t num_samples;
+
+ handle = mpg123_new(nullptr, &error);
+ if (handle == nullptr) {
+ FormatError(mpg123_domain,
+ "mpg123_new() failed: %s",
+ mpg123_plain_strerror(error));
+ return false;
+ }
+
+ AudioFormat audio_format;
+ if (!mpd_mpg123_open(handle, path_fs.c_str(), audio_format)) {
+ mpg123_delete(handle);
+ return false;
+ }
+
+ num_samples = mpg123_length(handle);
+ if (num_samples <= 0) {
+ mpg123_delete(handle);
+ return false;
+ }
+
+ /* ID3 tag support not yet implemented */
+
+ mpg123_delete(handle);
+
+ tag_handler_invoke_duration(handler, handler_ctx,
+ num_samples / audio_format.sample_rate);
+ return true;
+}
+
+static const char *const mpg123_suffixes[] = {
+ "mp3",
+ nullptr
+};
+
+const struct DecoderPlugin mpg123_decoder_plugin = {
+ "mpg123",
+ mpd_mpg123_init,
+ mpd_mpg123_finish,
+ /* streaming not yet implemented */
+ nullptr,
+ mpd_mpg123_file_decode,
+ mpd_mpg123_scan_file,
+ nullptr,
+ nullptr,
+ mpg123_suffixes,
+ nullptr,
+};