path: root/streamer.c

/*
    DeaDBeeF - ultimate music player for GNU/Linux systems with X11
    Copyright (C) 2009-2010 Alexey Yakovenko <waker@users.sourceforge.net>

    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, see <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <assert.h>
#include <unistd.h>
#include <samplerate.h>
#ifdef __linux__
#include <sys/prctl.h>
#endif
#include <sys/time.h>
#include "threading.h"
#include "playlist.h"
#include "common.h"
#include "streamer.h"
#include "playback.h"
#include "messagepump.h"
#include "conf.h"
#include "plugins.h"
#include "optmath.h"
#include "volume.h"
#include "vfs.h"

//#define trace(...) { fprintf(stderr, __VA_ARGS__); }
#define trace(fmt,...)

static intptr_t streamer_tid;
static int src_quality;
static SRC_STATE *src;
static SRC_DATA srcdata;
static int src_remaining; // number of input samples in SRC buffer

static int conf_replaygain_mode = 0;
static int conf_replaygain_scale = 1;

#define SRC_BUFFER 16000
static int src_in_remaining = 0;
//static int16_t g_src_in_buffer[SRC_BUFFER*2];
static __attribute__((__aligned__(16))) float g_src_in_fbuffer[SRC_BUFFER*2];
static __attribute__((__aligned__(16))) float g_src_out_fbuffer[SRC_BUFFER*2];

static int streaming_terminate;

// buffer up to 3 seconds at 44100Hz stereo
#define STREAM_BUFFER_SIZE 0x80000 // slightly more than 3 seconds of 44100 stereo
#define STREAM_BUFFER_MASK 0x7ffff
//#define STREAM_BUFFER_SIZE 0x10000 // slightly more than 3 seconds of 44100 stereo
//#define STREAM_BUFFER_MASK 0xffff

static int streambuffer_fill;
static int streambuffer_pos;
static int bytes_until_next_song = 0;
static char streambuffer[STREAM_BUFFER_SIZE];
static uintptr_t mutex;
static uintptr_t decodemutex;
static uintptr_t srcmutex;
static int nextsong = -1;
static int nextsong_pstate = -1;
static int badsong = -1;

static float seekpos = -1;

static float playpos = 0; // play position of current song
static int avg_bitrate = -1; // avg bitrate of current song
static int last_bitrate = -1; // last bitrate of current song

static playlist_t *streamer_playlist;
static playItem_t *playing_track;
static playItem_t *streaming_track;
static playItem_t *playlist_track;

static DB_fileinfo_t *fileinfo;

static int streamer_buffering;

// to allow interruption of stall file requests
static DB_FILE *streamer_file;

void
streamer_lock (void) {
    mutex_lock (mutex);
}

void
streamer_unlock (void) {
    mutex_unlock (mutex);
}

void
src_lock (void) {
    mutex_lock (srcmutex);
}

void
src_unlock (void) {
    mutex_unlock (srcmutex);
}

void
streamer_start_playback (playItem_t *from, playItem_t *it) {
    if (from) {
        pl_item_ref (from);
    }
    if (it) {
        pl_item_ref (it);
    }
    // free old copy of playing
    if (playing_track) {
        pl_item_unref (playing_track);
        playing_track = NULL;
    }
    playlist_track = it;
    // assign new
    playing_track = it;
    if (playing_track) {
        pl_item_ref (playing_track);
        playing_track->played = 1;
        playing_track->started_timestamp = time (NULL);
        trace ("sending songstarted to plugins [2] current playtrack: %s\n", playing_track->fname);
        plug_trigger_event (DB_EV_SONGSTARTED, 0);
        trace ("from=%p, to=%p[2]\n", from, it);
        plug_trigger_event_trackchange (from, it);
    }
    if (from) {
        pl_item_unref (from);
    }
    if (it) {
        pl_item_unref (it);
    }
}

playItem_t *
streamer_get_streaming_track (void) {
    if (streaming_track) {
        pl_item_ref (streaming_track);
    }
    return streaming_track;
}

playItem_t *
streamer_get_playing_track (void) {
    playItem_t *it = playing_track;// ? playing_track : playlist_track;
    if (it) {
        pl_item_ref (it);
    }
    return it;
}

int
str_get_idx_of (playItem_t *it) {
    plt_lock ();
    if (!streamer_playlist) {
        streamer_playlist = plt_get_curr_ptr ();
    }
    playItem_t *c = streamer_playlist->head[PL_MAIN];
    int idx = 0;
    while (c && c != it) {
        c = c->next[PL_MAIN];
        idx++;
    }
    if (!c) {
        plt_unlock ();
        return -1;
    }
    plt_unlock ();
    return idx;
}

playItem_t *
str_get_for_idx (int idx) {
    plt_lock ();
    if (!streamer_playlist) {
        streamer_playlist = plt_get_curr_ptr ();
    }
    playItem_t *it = streamer_playlist->head[PL_MAIN];
    while (idx--) {
        if (!it) {
            plt_unlock ();
            return NULL;
        }
        it = it->next[PL_MAIN];
    }
    if (it) {
        pl_item_ref (it);
    }
    plt_unlock ();
    return it;
}


int
streamer_move_to_nextsong (int reason) {
    pl_global_lock ();
    if (!streamer_playlist) {
        streamer_playlist = plt_get_curr_ptr ();
    }
    playlist_t *plt = streamer_playlist;
    playItem_t *it = pl_playqueue_getnext ();
    if (it) {
        pl_playqueue_pop ();
        int r = str_get_idx_of (it);
        pl_item_unref (it);
        streamer_set_nextsong (r, 1);
        pl_global_unlock ();
        return 0;
    }

    playItem_t *curr = playlist_track;
    if (!plt->head[PL_MAIN]) {
        streamer_set_nextsong (-2, 1);
        pl_global_unlock ();
        return 0;
    }
    int pl_order = conf_get_int ("playback.order", 0);
    int pl_loop_mode = conf_get_int ("playback.loop", 0);
    if (pl_order == PLAYBACK_ORDER_SHUFFLE) { // shuffle
        if (!curr) {
            // find minimal notplayed
            playItem_t *pmin = NULL; // notplayed minimum
            for (playItem_t *i = plt->head[PL_MAIN]; i; i = i->next[PL_MAIN]) {
                if (i->played) {
                    continue;
                }
                if (!pmin || i->shufflerating < pmin->shufflerating) {
                    pmin = i;
                }
            }
            playItem_t *it = pmin;
            if (!it) {
                // all songs played, reshuffle and try again
                if (pl_loop_mode == PLAYBACK_MODE_LOOP_ALL) { // loop
                    plt_reshuffle (streamer_playlist, &it, NULL);
                }
            }
            if (!it) {
                pl_global_unlock ();
                return -1;
            }
            int r = str_get_idx_of (it);
            streamer_set_nextsong (r, 1);
            pl_global_unlock ();
            return 0;
        }
        else {
            trace ("pl_next_song: reason=%d, loop=%d\n", reason, pl_loop_mode);
            if (reason == 0 && pl_loop_mode == PLAYBACK_MODE_LOOP_SINGLE) { // song finished, loop mode is "loop 1 track"
                int r = str_get_idx_of (curr);
                streamer_set_nextsong (r, 1);
                pl_global_unlock ();
                return 0;
            }
            // find minimal notplayed above current
            int rating = curr->shufflerating;
            playItem_t *pmin = NULL; // notplayed minimum
            for (playItem_t *i = plt->head[PL_MAIN]; i; i = i->next[PL_MAIN]) {
                if (i->played || i->shufflerating < rating) {
                    continue;
                }
                if (!pmin || i->shufflerating < pmin->shufflerating) {
                    pmin = i;
                }
            }
            playItem_t *it = pmin;
            if (!it) {
                trace ("all songs played! reshuffle\n");
                // all songs played, reshuffle and try again
                if (pl_loop_mode == PLAYBACK_MODE_LOOP_ALL) { // loop
                    plt_reshuffle (streamer_playlist, &it, NULL);
                }
            }
            if (!it) {
                pl_global_unlock ();
                return -1;
            }
            int r = str_get_idx_of (it);
            streamer_set_nextsong (r, 1);
            pl_global_unlock ();
            return 0;
        }
    }
    else if (pl_order == PLAYBACK_ORDER_LINEAR) { // linear
        playItem_t *it = NULL;
        if (curr) {
            if (reason == 0 && pl_loop_mode == PLAYBACK_MODE_LOOP_SINGLE) { // loop same track
                int r = str_get_idx_of (curr);
                streamer_set_nextsong (r, 1);
                pl_global_unlock ();
                return 0;
            }
            it = curr->next[PL_MAIN];
        }
        if (!it) {
            trace ("streamer_move_nextsong: was last track\n");
            if (pl_loop_mode == PLAYBACK_MODE_LOOP_ALL) {
                it = plt->head[PL_MAIN];
            }
            else {
                streamer_set_nextsong (-2, 1);
                pl_global_unlock ();
                return 0;
            }
        }
        if (!it) {
            pl_global_unlock ();
            return -1;
        }
        int r = str_get_idx_of (it);
        streamer_set_nextsong (r, 1);
        pl_global_unlock ();
        return 0;
    }
    else if (pl_order == PLAYBACK_ORDER_RANDOM) { // random
        if (reason == 0 && pl_loop_mode == PLAYBACK_MODE_LOOP_SINGLE && curr) {
            int r = str_get_idx_of (curr);
            streamer_set_nextsong (r, 1);
            pl_global_unlock ();
            return 0;
        }
        pl_global_unlock ();
        return streamer_move_to_randomsong ();
    }
    pl_global_unlock ();
    return -1;
}

int
streamer_move_to_prevsong (void) {
    plt_lock ();
    if (!streamer_playlist) {
        streamer_playlist = plt_get_curr_ptr ();
    }
    playlist_t *plt = streamer_playlist;
    pl_playqueue_clear ();
    if (!plt->head[PL_MAIN]) {
        streamer_set_nextsong (-2, 1);
        plt_unlock ();
        return 0;
    }
    int pl_order = conf_get_int ("playback.order", 0);
    int pl_loop_mode = conf_get_int ("playback.loop", 0);
    if (pl_order == PLAYBACK_ORDER_SHUFFLE) { // shuffle
        if (!playlist_track) {
            plt_unlock ();
            return streamer_move_to_nextsong (1);
        }
        else {
            playlist_track->played = 0;
            // find already played song with maximum shuffle rating below prev song
            int rating = playlist_track->shufflerating;
            playItem_t *pmax = NULL; // played maximum
            playItem_t *amax = NULL; // absolute maximum
            for (playItem_t *i = plt->head[PL_MAIN]; i; i = i->next[PL_MAIN]) {
                if (i != playlist_track && i->played && (!amax || i->shufflerating > amax->shufflerating)) {
                    amax = i;
                }
                if (i == playlist_track || i->shufflerating > rating || !i->played) {
                    continue;
                }
                if (!pmax || i->shufflerating > pmax->shufflerating) {
                    pmax = i;
                }
            }
            playItem_t *it = pmax;
            if (!it) {
                // that means 1st in playlist, take amax
                if (pl_loop_mode == PLAYBACK_MODE_LOOP_ALL) {
                    if (!amax) {
                        pl_reshuffle (NULL, &amax);
                    }
                    it = amax;
                }
            }

            if (!it) {
                plt_unlock ();
                return -1;
            }
            int r = str_get_idx_of (it);
            streamer_set_nextsong (r, 1);
            plt_unlock ();
            return 0;
        }
    }
    else if (pl_order == PLAYBACK_ORDER_LINEAR) { // linear
        playItem_t *it = NULL;
        if (playlist_track) {
            it = playlist_track->prev[PL_MAIN];
        }
        if (!it) {
            if (pl_loop_mode == PLAYBACK_MODE_LOOP_ALL) {
                it = plt->tail[PL_MAIN];
            }
        }
        if (!it) {
            plt_unlock ();
            return -1;
        }
        int r = str_get_idx_of (it);
        streamer_set_nextsong (r, 1);
        plt_unlock ();
        return 0;
    }
    else if (pl_order == PLAYBACK_ORDER_RANDOM) { // random
        streamer_move_to_randomsong ();
    }
    plt_unlock ();
    return -1;
}

int
streamer_move_to_randomsong (void) {
    int cnt = pl_getcount (PL_MAIN);
    if (!cnt) {
        return -1;
    }
    int r = rand () / (float)RAND_MAX * cnt;
    streamer_set_nextsong (r, 1);
    return 0;
}

// playlist must call that whenever item was removed
void
streamer_song_removed_notify (playItem_t *it) {
    if (!mutex) {
        return; // streamer is not running
    }
    if (it == playlist_track) {
        playlist_track = playlist_track->next[PL_MAIN];
        // queue new next song for streaming
        if (bytes_until_next_song > 0) {
            streambuffer_fill = bytes_until_next_song;
            streamer_move_to_nextsong (0);
        }
    }
}

// that must be called after last sample from str_playing_song was done reading
static int
streamer_set_current (playItem_t *it) {
    int err = 0;
    playItem_t *from, *to;
    // need to add refs here, because streamer_start_playback can destroy items
    from = playing_track;
    to = it;
    if (from) {
        pl_item_ref (from);
    }
    if (to) {
        pl_item_ref (to);
    }
    trace ("\033[0;35mstreamer_set_current from %p to %p\033[37;0m\n", from, it);
    if (!playing_track || p_isstopped ()) {
        trace ("buffering = on\n");
        streamer_buffering = 1;
        trace ("\033[0;35mstreamer_start_playback[1] from %p to %p\033[37;0m\n", from, it);
        streamer_start_playback (from, it);
        bytes_until_next_song = -1;
    }

// code below breaks seekbar drawing during transition between tracks
    trace ("streamer_set_current %p, buns=%d\n", it);
    mutex_lock (decodemutex);
    if (fileinfo) {
        fileinfo->plugin->free (fileinfo);
        fileinfo = NULL;
        if (streaming_track) {
            pl_item_unref (streaming_track);
            streaming_track = NULL;
        }
    }
    mutex_unlock (decodemutex);
    if (!it) {
        goto success;
    }
    if (to) {
        trace ("draw before init: %p->%p, playing_track=%p, playlist_track=%p\n", from, to, playing_track, playlist_track);
        plug_trigger_event_trackinfochanged (to);
    }
    if (from) {
        plug_trigger_event_trackinfochanged (from);
    }
    if (!it->decoder_id && it->filetype && !strcmp (it->filetype, "content")) {
        // try to get content-type
        mutex_lock (decodemutex);
        trace ("\033[0;34mopening file %s\033[37;0m\n", it->fname);
        DB_FILE *fp = streamer_file = vfs_fopen (it->fname);
        mutex_unlock (decodemutex);
        const char *plug = NULL;
        if (fp) {
            const char *ct = vfs_get_content_type (fp);
            if (ct) {
                trace ("got content-type: %s\n", ct);
                if (!strcmp (ct, "audio/mpeg")) {
                    plug = "stdmpg";
                }
                else if (!strcmp (ct, "application/ogg")) {
                    plug = "stdogg";
                }
                else if (!strcmp (ct, "audio/aacp")) {
                    plug = "ffmpeg";
                }
                else if (!strcmp (ct, "audio/aac")) {
                    plug = "ffmpeg";
                }
            }
            mutex_lock (decodemutex);
            streamer_file = NULL;
            vfs_fclose (fp);
            mutex_unlock (decodemutex);
        }
        if (plug) {
            DB_decoder_t **decoders = plug_get_decoder_list ();
            // match by decoder
            for (int i = 0; decoders[i]; i++) {
                if (!strcmp (decoders[i]->plugin.id, plug)) {
                    it->decoder_id = decoders[i]->plugin.id;
                    it->filetype = decoders[i]->filetypes[0];
                    trace ("\033[0;34mfound plugin %s\033[37;0m\n", plug);
                }
            }
        }
        else {
            trace ("\033[0;34mclosed file %s (bad or interrupted)\033[37;0m\n", it->fname);
        }
    }
    if (it->decoder_id) {
        DB_decoder_t *dec = NULL;
        dec = plug_get_decoder_for_id (it->decoder_id);
        if (dec) {
            trace ("\033[0;33minit decoder for %s\033[37;0m\n", it->fname);
            fileinfo = dec->open ();
            if (fileinfo && dec->init (fileinfo, DB_PLAYITEM (it)) != 0) {
                trace ("\033[0;31mfailed to init decoder\033[37;0m\n")
                dec->free (fileinfo);
                fileinfo = NULL;
            }
        }

        if (!dec || !fileinfo) {
            it->played = 1;
            trace ("decoder->init returned %p\n", fileinfo);
            streamer_buffering = 0;
            if (playlist_track == it) {
                trace ("redraw track %d; playing_track=%p; playlist_track=%p\n", to, playing_track, playlist_track);
                plug_trigger_event_trackinfochanged (to);
            }
            err = -1;
            goto error;
        }
        else {
            mutex_lock (decodemutex);
            if (streaming_track) {
                pl_item_unref (streaming_track);
            }
            streaming_track = it;
            pl_item_ref (streaming_track);
            mutex_unlock (decodemutex);
            trace ("bps=%d, channels=%d, samplerate=%d\n", fileinfo->bps, fileinfo->channels, fileinfo->samplerate);
        }
// FIXME: that might break streaming at boundaries between 2 different samplerates
//        streamer_reset (0); // reset SRC
    }
    else {
        trace ("no decoder in playitem!\n");
        it->played = 1;
        streamer_buffering = 0;
        if (playlist_track == it) {
            plug_trigger_event_trackinfochanged (to);
        }
        return -1;
    }
//    if (bytes_until_next_song == -1) {
//        bytes_until_next_song = 0;
//    }
success:
    plug_trigger_event_trackinfochanged (to);

    trace ("\033[0;32mstr: %p, ply: %p\033[37;0m\n", streaming_track, playing_track);

error:
    if (from) {
        pl_item_unref (from);
    }
    if (to) {
        pl_item_unref (to);
    }

    return err;
}

float
streamer_get_playpos (void) {
    return playpos;
}

void
streamer_set_bitrate (int bitrate) {
    if (bytes_until_next_song <= 0) { // prevent next track from resetting current playback bitrate
        last_bitrate = bitrate;
    }
}

int
streamer_get_apx_bitrate (void) {
    return avg_bitrate;
}

void
streamer_set_nextsong (int song, int pstate) {
    trace ("streamer_set_nextsong %d %d\n", song, pstate);
    //plug_trigger_event (DB_EV_ABORTREAD, 0);
    if (fileinfo && fileinfo->file) {
        trace ("\033[0;31maborting current song: %s (fileinfo %p, file %p)\033[37;0m\n", streaming_track ? streaming_track->fname : NULL, fileinfo, fileinfo ? fileinfo->file : NULL);
        mutex_lock (decodemutex);
        deadbeef->fabort (fileinfo->file);
        if (streamer_file) {
            trace ("\033[0;31maborting streamer_file\033[37;0m\n");
            deadbeef->fabort (streamer_file);
        }
        mutex_unlock (decodemutex);
        trace ("\033[0;31maborting current song done\033[37;0m\n");
    }
    nextsong = song;
    nextsong_pstate = pstate;
    if (p_isstopped ()) {
        if (pstate == 1) { // means user initiated this
            streamer_playlist = plt_get_curr_ptr ();
        }
        // no sense to wait until end of previous song, reset buffer
        bytes_until_next_song = 0;
        playpos = 0;
    }
}

void
streamer_set_seek (float pos) {
    seekpos = pos;
}

static int
streamer_read_async (char *bytes, int size);

static void
streamer_start_new_song (void) {
    trace ("nextsong=%d\n", nextsong);
    int sng = nextsong;
    int pstate = nextsong_pstate;
    nextsong = -1;
    src_remaining = 0;
    if (badsong == sng) {
        trace ("looped to bad file. stopping...\n");
        streamer_set_nextsong (-2, 1);
        badsong = -1;
        return;
    }
    playItem_t *try = str_get_for_idx (sng);
    if (!try) { // track is not in playlist
        trace ("track #%d is not in playlist; stopping playback\n", sng);
        p_stop ();

        mutex_lock (decodemutex);
        if (playing_track) {
            pl_item_unref (playing_track);
            playing_track = NULL;
        }
        if (streaming_track) {
            pl_item_unref (streaming_track);
            streaming_track = NULL;
        }
        mutex_unlock (decodemutex);

        plug_trigger_event_trackchange (NULL, NULL);
        return;
    }
    int ret = streamer_set_current (try);

    if (ret < 0) {
        trace ("\033[0;31mfailed to play track %s, skipping (current=%p/%p)...\033[37;0m\n", try->fname, streaming_track, playlist_track);
        pl_item_unref (try);
        try = NULL;
        // remember bad song number in case of looping
        if (badsong == -1) {
            badsong = sng;
        }
        trace ("\033[0;34mbadsong=%d\033[37;0m\n", badsong);
        // try jump to next song
        if (nextsong == sng) {
            streamer_move_to_nextsong (0);
            trace ("streamer_move_to_nextsong switched to track %d\n", nextsong);
            usleep (50000);
        }
        else {
            trace ("nextsong changed to %d by another thread, reinit\n", nextsong);
            badsong = -1;
        }
        return;
    }
    pl_item_unref (try);
    try = NULL;
    badsong = -1;
    if (pstate == 0) {
        p_stop ();
    }
    else if (pstate == 1) {
        last_bitrate = -1;
        avg_bitrate = -1;
        if (p_state () != OUTPUT_STATE_PLAYING) {
            if (p_play () < 0) {
                fprintf (stderr, "streamer: failed to start playback; output plugin doesn't work\n");
                streamer_set_nextsong (-2, 0);
            }
        }
    }
    else if (pstate == 2) {
        p_pause ();
    }
}

void
streamer_thread (void *ctx) {
#ifdef __linux__
    prctl (PR_SET_NAME, "deadbeef-stream", 0, 0, 0, 0);
#endif
    src_remaining = 0;

    while (!streaming_terminate) {
        struct timeval tm1;
        gettimeofday (&tm1, NULL);
        if (nextsong >= 0) { // start streaming next song
            trace ("\033[0;34mnextsong=%d\033[37;0m\n", nextsong);
            streamer_start_new_song ();
            // it's totally possible that song was switched
            // while streamer_set_current was running,
            // so we need to restart here
            continue;
        }
        else if (nextsong == -2 && (nextsong_pstate==0 || bytes_until_next_song == 0)) {
            playItem_t *from = playing_track;
            bytes_until_next_song = -1;
            trace ("nextsong=-2\n");
            nextsong = -1;
            p_stop ();
            if (playing_track) {
                trace ("sending songfinished to plugins [1]\n");
                plug_trigger_event (DB_EV_SONGFINISHED, 0);
            }
            if (from) {
                pl_item_ref (from);
            }
            streamer_set_current (NULL);
            if (playing_track) {
                pl_item_unref (playing_track);
                playing_track = NULL;
            }
            plug_trigger_event_trackchange (from, NULL);
            if (from) {
                pl_item_unref (from);
            }
            continue;
        }
        else if (p_isstopped ()) {
            usleep (50000);
            continue;
        }

        if (bytes_until_next_song == 0) {
            if (!streaming_track) {
                // means last song was deleted during final drain
                nextsong = -1;
                p_stop ();
                streamer_set_current (NULL);
                continue;
            }
            trace ("bytes_until_next_song=0, starting playback of new song\n");
            playItem_t *from = playing_track;
            playItem_t *to = streaming_track;
            trace ("sending songchanged\n");
            bytes_until_next_song = -1;
            // plugin will get pointer to str_playing_song
            if (playing_track) {
                trace ("sending songfinished to plugins [2]\n");
                plug_trigger_event (DB_EV_SONGFINISHED, 0);
            }
            // copy streaming into playing
            trace ("\033[0;35mstreamer_start_playback[2] from %p to %p\033[37;0m\n", playing_track, streaming_track);
            streamer_start_playback (playing_track, streaming_track);
            last_bitrate = -1;
            avg_bitrate = -1;
            playlist_track = playing_track;
            playpos = 0;

            // try to switch samplerate to the closest supported by output plugin
            if (conf_get_int ("playback.dynsamplerate", 0)) {

                // don't switch if unchanged
                int prevtrack_samplerate = p_get_rate ();
                if (prevtrack_samplerate != fileinfo->samplerate) {
                    int newrate = plug_get_output ()->change_rate (fileinfo->samplerate);
                    if (newrate != prevtrack_samplerate) {
                        // restart streaming of current track
                        trace ("streamer: output samplerate changed from %d to %d; restarting track\n", prevtrack_samplerate, newrate);
                        mutex_lock (decodemutex);
                        fileinfo->plugin->free (fileinfo);
                        fileinfo = NULL;
                        DB_decoder_t *dec = NULL;
                        dec = plug_get_decoder_for_id (streaming_track->decoder_id);
                        if (dec) {
                            fileinfo = dec->open ();
                            if (fileinfo && dec->init (fileinfo, DB_PLAYITEM (streaming_track) < 0)) {
                                dec->free (fileinfo);
                                fileinfo = NULL;
                            }
                        }
                        if (!dec || !fileinfo) {
                            // FIXME: handle error
                        }
                        mutex_unlock (decodemutex);
                        bytes_until_next_song = -1;
                        streamer_buffering = 1;
                        streamer_reset (1);
                        if (fileinfo) {
                            prevtrack_samplerate = fileinfo->samplerate;
                        }
                    }
                }

                // output plugin may stop playback before switching samplerate
                if (p_state () != OUTPUT_STATE_PLAYING) {
                    if (p_play () < 0) {
                        fprintf (stderr, "streamer: failed to start playback after samplerate change; output plugin doesn't work\n");
                        streamer_set_nextsong (-2, 0);
                        continue;
                    }
                }
            }
        }

        if (seekpos >= 0) {
            trace ("seeking to %f\n", seekpos);
            float pos = seekpos;
            seekpos = -1;

            if (playing_track != streaming_track) {
                trace ("streamer already switched to next track\n");
                
                // restart playing from new position
                
                mutex_lock (decodemutex);
                if(fileinfo) {
                    fileinfo->plugin->free (fileinfo);
                    pl_item_unref (streaming_track);
                    streaming_track = NULL;
                }
                streaming_track = playing_track;
                if (streaming_track) {
                    pl_item_ref (streaming_track);
                }
                mutex_unlock (decodemutex);

                bytes_until_next_song = -1;
                streamer_buffering = 1;
                if (streaming_track) {
                    plug_trigger_event_trackinfochanged (streaming_track);
                }

                mutex_lock (decodemutex);
                DB_decoder_t *dec = NULL;
                dec = plug_get_decoder_for_id (streaming_track->decoder_id);
                if (dec) {
                    fileinfo = dec->open ();
                    if (fileinfo && dec->init (fileinfo, DB_PLAYITEM (streaming_track)) != 0) {
                        dec->free (fileinfo);
                        fileinfo = NULL;
                    }
                }
                mutex_unlock (decodemutex);

                if (!dec || !fileinfo) {
                    if (streaming_track) {
                        plug_trigger_event_trackinfochanged (streaming_track);
                    }
                    trace ("failed to restart prev track on seek, trying to jump to next track\n");
                    streamer_move_to_nextsong (0);
                    trace ("streamer_move_to_nextsong switched to track %d\n", nextsong);
                    usleep (50000);
                    continue;
                }
            }

            bytes_until_next_song = -1;
            streamer_buffering = 1;
            if (streaming_track) {
                plug_trigger_event_trackinfochanged (streaming_track);
            }
            if (fileinfo && playing_track && playing_track->_duration > 0) {
                streamer_lock ();
                streamer_reset (1);
#if 0
                streambuffer_fill = 0;
                streambuffer_pos = 0;
                src_remaining = 0;
#endif
                if (fileinfo->plugin->seek (fileinfo, pos) >= 0) {
                    playpos = fileinfo->readpos;
                }
                last_bitrate = -1;
                avg_bitrate = -1;
                streamer_unlock();
            }
        }

        // read ahead at 2x speed of output samplerate, in 4k blocks
        int rate = p_get_rate ();
        if (!rate) {
            trace ("str: got 0 output samplerate\n");
            usleep(20000);
            continue;
        }
        int channels = 2; // FIXME: needs to be queried from output plugin
        int bytes_in_one_second = rate * sizeof (int16_t) * channels;
        const int blocksize = 4096;
        int alloc_time = 1000 / (bytes_in_one_second * 2 / blocksize);

        streamer_lock ();
        if (streambuffer_fill < (STREAM_BUFFER_SIZE-blocksize)) {
            int sz = STREAM_BUFFER_SIZE - streambuffer_fill;
            int minsize = blocksize;

            // speed up buffering when empty
            if (streambuffer_fill < 16384) {
                minsize *= 4;
                alloc_time *= 4;
            }
            sz = min (minsize, sz);
            assert ((sz&3) == 0);
            char buf[sz];
            streamer_unlock ();
            int bytesread = streamer_read_async (buf,sz);
            streamer_lock ();
            memcpy (streambuffer+streambuffer_fill, buf, sz);
            streambuffer_fill += bytesread;
//            if (streamer_buffering) trace ("fill: %d, read: %d, size=%d, blocksize=%d\n", streambuffer_fill, bytesread, STREAM_BUFFER_SIZE, blocksize);
        }
        streamer_unlock ();
        if ((streambuffer_fill > 128000 && streamer_buffering) || !streaming_track) {
            streamer_buffering = 0;
            if (streaming_track) {
                plug_trigger_event_trackinfochanged (streaming_track);
            }
        }
        struct timeval tm2;
        gettimeofday (&tm2, NULL);

        int ms = (tm2.tv_sec*1000+tm2.tv_usec/1000) - (tm1.tv_sec*1000+tm1.tv_usec/1000);
        alloc_time -= ms;
        if (alloc_time > 0) {
            usleep (alloc_time * 1000);
//            usleep (1000);
        }
//        trace ("fill: %d/%d\n", streambuffer_fill, STREAM_BUFFER_SIZE);
    }

    // stop streaming song
    mutex_lock (decodemutex);
    if (fileinfo) {
        fileinfo->plugin->free (fileinfo);
        fileinfo = NULL;
    }
    if (streaming_track) {
        pl_item_unref (streaming_track);
        streaming_track = NULL;
    }
    if (playing_track) {
        pl_item_unref (playing_track);
        playing_track = NULL;
    }
    mutex_unlock (decodemutex);

    if (src) {
        src_delete (src);
        src = NULL;
    }
}

int
streamer_init (void) {
    mutex = mutex_create ();
    decodemutex = mutex_create ();
    srcmutex = mutex_create ();
    src_quality = conf_get_int ("src_quality", 2);
    src = src_new (src_quality, 2, NULL);
    conf_replaygain_mode = conf_get_int ("replaygain_mode", 0);
    conf_replaygain_scale = conf_get_int ("replaygain_scale", 1);
    if (!src) {
        return -1;
    }
    streamer_tid = thread_start (streamer_thread, NULL);
    return 0;
}

void
streamer_free (void) {
    streaming_terminate = 1;
    thread_join (streamer_tid);
    mutex_free (decodemutex);

    if (streaming_track) {
        pl_item_unref (streaming_track);
        streaming_track = NULL;
    }
    if (playing_track) {
        pl_item_unref (playing_track);
        playing_track = NULL;
    }
    if (playlist_track) {
        playlist_track = NULL;
    }

    decodemutex = 0;
    mutex_free (mutex);
    mutex = 0;
    mutex_free (srcmutex);
    srcmutex = 0;
}

void
streamer_reset (int full) { // must be called when current song changes by external reasons
    src_lock ();
    if (full) {
        streambuffer_pos = 0;
        streambuffer_fill = 0;
    }
    src_remaining = 0;
    src_reset (src);
    // reset dsp
    DB_dsp_t **dsp = deadbeef->plug_get_dsp_list ();
    int srate = p_get_rate ();
    for (int i = 0; dsp[i]; i++) {
        if (dsp[i]->enabled ()) {
            dsp[i]->reset ();
        }
    }
    src_unlock ();
}

int replaygain = 1;
int replaygain_scale = 1;

static void
apply_replay_gain_int16 (playItem_t *it, char *bytes, int size) {
    if (!replaygain || !conf_replaygain_mode) {
        return;
    }
    int vol = 1000;
    if (conf_replaygain_mode == 1) {
        if (it->replaygain_track_gain == 0) {
            return;
        }
        if (conf_replaygain_scale && replaygain_scale) {
            vol = db_to_amp (streaming_track->replaygain_track_gain)/streaming_track->replaygain_track_peak * 1000;
        }
        else {
            vol = db_to_amp (streaming_track->replaygain_track_gain) * 1000;
        }
    }
    else if (conf_replaygain_mode == 2) {
        if (it->replaygain_album_gain == 0) {
            return;
        }
        if (conf_replaygain_scale && replaygain_scale) {
            vol = db_to_amp (streaming_track->replaygain_album_gain)/streaming_track->replaygain_album_peak * 1000;
        }
        else {
            vol = db_to_amp (streaming_track->replaygain_album_gain) * 1000;
        }
    }
    int16_t *s = (int16_t*)bytes;
    for (int j = 0; j < size/2; j++) {
        int32_t sample = ((int32_t)(*s)) * vol / 1000;
        if (sample > 0x7fff) {
            sample = 0x7fff;
        }
        else if (sample < -0x8000) {
            sample = -0x8000;
        }
        *s = (int16_t)sample;
        s++;
    }
}

static void
apply_replay_gain_float32 (playItem_t *it, char *bytes, int size) {
    if (!replaygain || !conf_replaygain_mode) {
        return;
    }
    float vol = 1.f;
    if (conf_replaygain_mode == 1) {
        if (it->replaygain_track_gain == 0) {
            return;
        }
        if (conf_replaygain_scale && replaygain_scale) {
            vol = db_to_amp (it->replaygain_track_gain)/it->replaygain_track_peak;
        }
        else {
            vol = db_to_amp (it->replaygain_track_gain);
        }
    }
    else if (conf_replaygain_mode == 2) {
        if (it->replaygain_album_gain == 0) {
            return;
        }
        if (conf_replaygain_scale && replaygain_scale) {
            vol = db_to_amp (it->replaygain_album_gain)/it->replaygain_album_peak;
        }
        else {
            vol = db_to_amp (it->replaygain_album_gain);
        }
    }
    float *s = (float*)bytes;
    for (int j = 0; j < size/4; j++) {
        float sample = ((float)*s) * vol;
        if (sample > 1.f) {
            sample = 1.f;
        }
        else if (sample < -1.f) {
            sample = -1.f;
        }
        *s = sample;
        s++;
    }
}

static void
mono_int16_to_stereo_int16 (int16_t *in, int16_t *out, int nsamples) {
    while (nsamples > 0) {
        int16_t sample = *in++;
        *out++ = sample;
        *out++ = sample;
        nsamples--;
    }
}

#if 0
static void
int16_to_float32 (int16_t *in, float *out, int nsamples) {
    while (nsamples > 0) {
        *out++ = (*in++)/(float)0x7fff;
        nsamples--;
    }
}

static void
mono_int16_to_stereo_float32 (int16_t *in, float *out, int nsamples) {
    while (nsamples > 0) {
        float sample = (*in++)/(float)0x7fff;
        *out++ = sample;
        *out++ = sample;
        nsamples--;
    }
}

static void
mono_float32_to_stereo_float32 (float *in, float *out, int nsamples) {
    while (nsamples > 0) {
        float sample = *in++;
        *out++ = sample;
        *out++ = sample;
        nsamples--;
    }
}
#endif

static void
float32_to_int16 (float *in, int16_t *out, int nsamples) {
    fpu_control ctl;
    fpu_setround (&ctl);
    while (nsamples > 0) {
        float sample = *in++;
        if (sample > 1) {
            sample = 1;
        }
        else if (sample < -1) {
            sample = -1;
        }
        *out++ = (int16_t)ftoi (sample*0x7fff);
        nsamples--;
    }
    fpu_restore (ctl);
}

/*

   src algorithm

   initsize = size;
   while (size > 0) {
        need_frames = SRC_BUFFER - src_remaining
        read_samples (need_frames)
        src_process (output_frames)
        convert_to_int16 (bytes, size)
        // handle errors
    }
    return initsize-size;

*/

static int
streamer_read_data_for_src (int16_t *buffer, int frames) {
    int channels = fileinfo->channels;
    if (channels > 2) {
        channels = 2;
    }
    int bytesread = fileinfo->plugin->read_int16 (fileinfo, (uint8_t*)buffer, frames * sizeof (int16_t) * channels);
    apply_replay_gain_int16 (streaming_track, (uint8_t*)buffer, bytesread);
    if (channels == 1) {
        // convert to stereo
        int n = frames-1;
        while (n >= 0) {
            buffer[n*2+0] = buffer[n];
            buffer[n*2+1] = buffer[n];
            n--;
        }
    }
    return bytesread / (sizeof (int16_t) * channels);
}

static int
streamer_read_data_for_src_float (float *buffer, int frames) {
    int channels = fileinfo->channels;
    if (channels > 2) {
        channels = 2;
    }
    if (fileinfo->plugin->read_float32) {
        int bytesread = fileinfo->plugin->read_float32 (fileinfo, (uint8_t*)buffer, frames * sizeof (float) * channels);
        apply_replay_gain_float32 (streaming_track, (uint8_t*)buffer, bytesread);
        if (channels == 1) {
            // convert to stereo
            int n = frames-1;
            while (n >= 0) {
                buffer[n*2+1] = buffer[n];
                buffer[n*2+0] = buffer[n];
                n--;
            }
        }
        return bytesread / (sizeof (float) * channels);
    }

//    trace ("read_float32 not impl\n");
    int16_t intbuffer[frames*2];
    int res = streamer_read_data_for_src (intbuffer, frames);
    for (int i = 0; i < res; i++) {
        buffer[i*2+0] = intbuffer[i*2+0]/(float)0x7fff;
        buffer[i*2+1] = intbuffer[i*2+1]/(float)0x7fff;
    }
    return res;
}

static int
streamer_decode_src_libsamplerate (uint8_t *bytes, int size) {
    int initsize = size;
    int16_t *out = (int16_t *)bytes;
    int samplerate = fileinfo->samplerate;
    if (!samplerate) {
        return 0;
    }
    float ratio = p_get_rate ()/(float)samplerate;
    while (size > 0) {
        int n_output_frames = size / sizeof (int16_t) / 2;
        int n_input_frames = n_output_frames * samplerate / p_get_rate () + 100;
        // read data from decoder
        if (n_input_frames >= SRC_BUFFER - src_remaining ) {
            n_input_frames = SRC_BUFFER - src_remaining;
        }

        int nread;
        if (!n_input_frames) {
            nread = 0;
        }
        else {
            nread = streamer_read_data_for_src_float (&g_src_in_fbuffer[src_remaining*2], n_input_frames);
        }
        src_remaining += nread;
        if (!src_remaining) {
            trace ("SRC input buffer empty\n");
            break;
        }
        // resample

        srcdata.data_in = g_src_in_fbuffer;
        srcdata.data_out = g_src_out_fbuffer;
        srcdata.input_frames = src_remaining;
        srcdata.output_frames = size/4;
        srcdata.src_ratio = ratio;
//        trace ("SRC from %d to %d\n", samplerate, p_get_rate ());
        srcdata.end_of_input = 0;//(nread == n_input_frames) ? 0 : 1;
        //if (streamer_buffering)
        src_lock ();
        src_set_ratio (src, ratio);
        int src_err = src_process (src, &srcdata);
        src_unlock ();
        if (src_err) {
            const char *err = src_strerror (src_err) ;
            fprintf (stderr, "src_process error %s\n"
                    "srcdata.data_in=%p, srcdata.data_out=%p, srcdata.input_frames=%d, srcdata.output_frames=%d, srcdata.src_ratio=%f", err, srcdata.data_in, srcdata.data_out, srcdata.input_frames, srcdata.output_frames, (float)srcdata.src_ratio);
            exit (-1);
        }
        // convert back to s16 format
        int genbytes = srcdata.output_frames_gen * 4;
        int bytesread = min(size, genbytes);
        float32_to_int16 ((float*)g_src_out_fbuffer, (int16_t*)bytes, bytesread>>1);
        size -= bytesread;
        bytes += bytesread;
        // calculate how many unused input samples left
        src_remaining -= srcdata.input_frames_used;

        // copy spare samples for next update
        if (src_remaining > 0) {
            memmove (g_src_in_fbuffer, &g_src_in_fbuffer[srcdata.input_frames_used*2], src_remaining * sizeof (float) * 2);
        }

//        if (nread != n_input_frames) {
//            trace ("nread=%d, n_input_frames=%d, mismatch!\n", nread, n_input_frames);
//            break;
//        }
    }
    return initsize-size;
}

#if 0
static int
streamer_decode_src (uint8_t *bytes, int size) {
    int initsize = size;
    int16_t *out = (int16_t *)bytes;
    DB_decoder_t *decoder = streaming_track->decoder;
    int samplerate = decoder->info.samplerate;
    float ratio = (float)samplerate / p_get_rate ();
    while (size > 0) {
        int n_output_frames = size / sizeof (int16_t) / 2;
        int n_input_frames = n_output_frames * samplerate / p_get_rate () + 100;
        // read data from decoder
        if (n_input_frames > SRC_BUFFER - src_remaining ) {
            n_input_frames = SRC_BUFFER - src_remaining;
        }
        int nread = streamer_read_data_for_src (&g_src_in_buffer[src_remaining*2], n_input_frames);
        src_remaining += nread;
        // resample
        float idx = 0;
        int i = 0;
        while (i < n_output_frames && idx < src_remaining) {
            int k = (int)idx;
            out[0] = g_src_in_buffer[k*2+0];
            out[1] = g_src_in_buffer[k*2+1];
            i++;
            idx += ratio;
            out += 2;
        }
        size -= i*4;
        src_remaining -= idx;
        if (src_remaining < 0) {
            src_remaining = 0;
        }
        else if (src_remaining > 0) {
            memmove (g_src_in_buffer, &g_src_in_buffer[(SRC_BUFFER-src_remaining)*2], src_remaining*2*sizeof (int16_t));
        }
        if (nread != n_input_frames) {
            break;
        }
    }
    return initsize-size;
}
#endif

// returns number of bytes been read
static int
streamer_read_async (char *bytes, int size) {
    int initsize = size;
    for (;;) {
        int bytesread = 0;
        mutex_lock (decodemutex);
        if (!fileinfo) {
            // means there's nothing left to stream, so just do nothing
            mutex_unlock (decodemutex);
            break;
        }
        if (fileinfo->samplerate != -1) {
            int nchannels = fileinfo->channels;
            if (nchannels > 2) {
                nchannels = 2;
            }
            int samplerate = fileinfo->samplerate;
            if (fileinfo->samplerate == p_get_rate ()) {
                // samplerate match
                if (nchannels == 2) {
                    bytesread = fileinfo->plugin->read_int16 (fileinfo, bytes, size);
                    apply_replay_gain_int16 (streaming_track, bytes, bytesread);
                }
                else {
                    uint8_t buffer[size>>1];
                    bytesread = fileinfo->plugin->read_int16 (fileinfo, buffer, size>>1);
                    apply_replay_gain_int16 (streaming_track, buffer, bytesread);
                    mono_int16_to_stereo_int16 ((int16_t*)buffer, (int16_t*)bytes, size>>2);
                    bytesread *= 2;
                }
            }
            else if (src_is_valid_ratio (p_get_rate ()/(double)samplerate)) {
                bytesread = streamer_decode_src_libsamplerate (bytes, size);
            }
            else {
                fprintf (stderr, "error: invalid ratio! %d / %d (this indicates decoder or streamer bug)\n", p_get_rate (), samplerate);
                fprintf (stderr, "error: file: %s\n", streaming_track ? streaming_track->fname : "(null)");
                // immediately start streaming next track
                bytes_until_next_song = -1;
            }
        }
        // apply dsp
        DB_dsp_t **dsp = deadbeef->plug_get_dsp_list ();
        int srate = p_get_rate ();
        for (int i = 0; dsp[i]; i++) {
            if (dsp[i]->enabled ()) {
                dsp[i]->process_int16 ((int16_t *)bytes, bytesread/4, 2, 16, srate);
            }
        }
        mutex_unlock (decodemutex);
        bytes += bytesread;
        size -= bytesread;
        if (size == 0) {
            return initsize;
        }
        else  {
            // that means EOF
            if (bytes_until_next_song < 0) // don't start streaming new if already draining
            {
                trace ("finished streaming song, queueing next\n");
                bytes_until_next_song = streambuffer_fill;
                if (conf_get_int ("playlist.stop_after_current", 0)) {
                    conf_set_int ("playlist.stop_after_current", 0);
                    plug_trigger_event (DB_EV_CONFIGCHANGED, 0);
                    streamer_set_nextsong (-2, 1);
                }
                else {
                    streamer_move_to_nextsong (0);
                }
            }
            break;
        }
    }
    return initsize - size;
}
int
streamer_read (char *bytes, int size) {
#if 0
    struct timeval tm1;
    gettimeofday (&tm1, NULL);
#endif
    if (!playing_track) {
        return -1;
    }
    streamer_lock ();
    int sz = min (size, streambuffer_fill);
    if (sz) {
        memcpy (bytes, streambuffer, sz);
        memmove (streambuffer, streambuffer+sz, streambuffer_fill-sz);
        streambuffer_fill -= sz;
        playpos += (float)sz/p_get_rate ()/4.f;
        playing_track->playtime += (float)sz/p_get_rate ()/4.f;
        if (playlist_track) {
            playing_track->filetype = playlist_track->filetype;
        }
        if (playlist_track) {
            playlist_track->playtime = playing_track->playtime;
        }
        if (bytes_until_next_song > 0) {
            bytes_until_next_song -= sz;
            if (bytes_until_next_song < 0) {
                bytes_until_next_song = 0;
            }
        }
    }
    streamer_unlock ();

    // approximate bitrate
    if (last_bitrate != -1) {
        if (avg_bitrate == -1) {
            avg_bitrate = last_bitrate;
        }
        else {
            if (avg_bitrate < last_bitrate) {
                avg_bitrate += 5;
                if (avg_bitrate > last_bitrate) {
                    avg_bitrate = last_bitrate;
                }
            }
            else if (avg_bitrate > last_bitrate) {
                avg_bitrate -= 5;
                if (avg_bitrate < last_bitrate) {
                    avg_bitrate = last_bitrate;
                }
            }
        }
//        printf ("apx bitrate: %d (last %d)\n", avg_bitrate, last_bitrate);
    }
    else {
        avg_bitrate = -1;
    }

#if 0
    struct timeval tm2;
    gettimeofday (&tm2, NULL);

    int ms = (tm2.tv_sec*1000+tm2.tv_usec/1000) - (tm1.tv_sec*1000+tm1.tv_usec/1000);
    printf ("streamer_read took %d ms\n", ms);
#endif
    return sz;
}

int
streamer_get_fill (void) {
    return streambuffer_fill;
}

int
streamer_ok_to_read (int len) {
    if (len >= 0 && (bytes_until_next_song > 0 || streambuffer_fill >= (len*2))) {
        return 1;
    }
    else {
        return 1-streamer_buffering;
    }
    return 0;
}

int
streamer_is_buffering (void) {
    if (streambuffer_fill < 16384) {
        return 1;
    }
    else {
        return 0;
    }
}

void
streamer_configchanged (void) {
    conf_replaygain_mode = conf_get_int ("replaygain_mode", 0);
    conf_replaygain_scale = conf_get_int ("replaygain_scale", 1);
    int q = conf_get_int ("src_quality", 2);
    if (q != src_quality && q >= SRC_SINC_BEST_QUALITY && q <= SRC_LINEAR) {
        src_lock ();
        trace ("changing src_quality from %d to %d\n", src_quality, q);
        src_quality = q;
        if (src) {
            src_delete (src);
            src = NULL;
        }
        memset (&srcdata, 0, sizeof (srcdata));
        src = src_new (src_quality, 2, NULL);
        src_unlock ();
    }
}

void
streamer_play_current_track (void) {
    playlist_t *plt = plt_get_curr_ptr ();
    if (p_ispaused () && playing_track) {
        // unpause currently paused track
        p_unpause ();
        plug_trigger_event_paused (0);
    }
    else if (plt->current_row[PL_MAIN] != -1) {
        // play currently selected track in current playlist
        p_stop ();
        // get next song in queue
        int idx = -1;
        playItem_t *next = pl_playqueue_getnext ();
        if (next) {
            idx = str_get_idx_of (next);
            pl_playqueue_pop ();
        }
        else {
            idx = plt->current_row[PL_MAIN];
        }

        streamer_set_nextsong (idx, 1);
        streamer_playlist = plt;
    }
    else {
        // restart currently playing track
        p_stop ();
        streamer_set_nextsong (0, 1);
    }
}

struct DB_fileinfo_s *
streamer_get_current_fileinfo (void) {
    return fileinfo;
}

int
streamer_get_current_playlist (void) {
    if (!streamer_playlist) {
        streamer_playlist = plt_get_curr_ptr ();
    }
    return plt_get_idx_of (streamer_playlist);
}

void
streamer_notify_playlist_deleted (playlist_t *plt) {
    if (plt == streamer_playlist) {
        streamer_playlist = NULL;
    }
}