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owntone-server/src/inputs/pipe.c

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/*
* Copyright (C) 2017 Espen Jurgensen
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*
* About pipe.c
* --------------
* This module will read a PCM16 stream from a named pipe and write it to the
* input buffer. The user may start/stop playback from a pipe by selecting it
* through a client. If the user has configured pipe_autostart, then pipes in
* the library will also be watched for data, and playback will start/stop
* automatically.
*
* The module will also look for pipes with a .metadata suffix, and if found,
* the metadata will be parsed and fed to the player. The metadata must be in
* the format Shairport uses for this purpose.
*
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <unistd.h>
#include <stdint.h>
#include <inttypes.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>
#include <limits.h>
#include <pthread.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <event2/event.h>
#include <event2/buffer.h>
#include "mxml-compat.h"
#include "input.h"
#include "misc.h"
#include "logger.h"
#include "db.h"
#include "conffile.h"
#include "listener.h"
#include "player.h"
#include "worker.h"
#include "commands.h"
// Maximum number of pipes to watch for data
#define PIPE_MAX_WATCH 4
// Max number of bytes to read from a pipe at a time
#define PIPE_READ_MAX 65536
// Max number of bytes to buffer from metadata pipes
#define PIPE_METADATA_BUFLEN_MAX 1048576
// Ignore pictures with larger size than this
#define PIPE_PICTURE_SIZE_MAX 1048576
// Where we store pictures for the artwork module to read
#define PIPE_TMPFILE_TEMPLATE "/tmp/" PACKAGE_NAME ".XXXXXX.ext"
#define PIPE_TMPFILE_TEMPLATE_EXTLEN 4
enum pipetype
{
PIPE_PCM,
PIPE_METADATA,
};
struct pipe
{
int id; // The mfi id of the pipe
int fd; // File descriptor
bool is_autostarted; // We autostarted the pipe (and we will autostop)
char *path; // Path
enum pipetype type; // PCM (audio) or metadata
event_callback_fn cb; // Callback when there is data to read
struct event *ev; // Event for the callback
struct pipe *next;
};
// Extension of struct pipe with extra fields for metadata handling
struct pipe_metadata
{
// Pipe that we start watching for metadata after playback starts
struct pipe *pipe;
// We read metadata into this evbuffer
struct evbuffer *evbuf;
// Parsed metadata goes here
struct input_metadata parsed;
// Except picture (artwork) data which we store here
int pict_tmpfile_fd;
char pict_tmpfile_path[sizeof(PIPE_TMPFILE_TEMPLATE)];
// Mutex to share the parsed metadata
pthread_mutex_t lock;
// True if there is new metadata to push to the player
bool is_new;
};
union pipe_arg
{
uint32_t id;
struct pipe *pipelist;
};
// The usual thread stuff
static pthread_t tid_pipe;
static struct event_base *evbase_pipe;
static struct commands_base *cmdbase;
// From config - the sample rate and bps of the pipe input
static int pipe_sample_rate;
static int pipe_bits_per_sample;
// From config - should we watch library pipes for data or only start on request
static int pipe_autostart;
// The mfi id of the pipe autostarted by the pipe thread
static int pipe_autostart_id;
// Global list of pipes we are watching (if watching/autostart is enabled)
static struct pipe *pipe_watch_list;
// Pipe + extra fields that we start watching for metadata after playback starts
static struct pipe_metadata pipe_metadata;
/* -------------------------------- HELPERS --------------------------------- */
static struct pipe *
pipe_create(const char *path, int id, enum pipetype type, event_callback_fn cb)
{
struct pipe *pipe;
pipe = calloc(1, sizeof(struct pipe));
pipe->path = strdup(path);
pipe->id = id;
pipe->fd = -1;
pipe->type = type;
pipe->cb = cb;
return pipe;
}
static void
pipe_free(struct pipe *pipe)
{
free(pipe->path);
free(pipe);
}
static int
pipe_open(const char *path, bool silent)
{
struct stat sb;
int fd;
DPRINTF(E_DBG, L_PLAYER, "(Re)opening pipe: '%s'\n", path);
if (lstat(path, &sb) < 0)
{
if (!silent)
DPRINTF(E_LOG, L_PLAYER, "Could not lstat() '%s': %s\n", path, strerror(errno));
return -1;
}
if (!S_ISFIFO(sb.st_mode))
{
DPRINTF(E_LOG, L_PLAYER, "Source type is pipe, but path is not a fifo: %s\n", path);
return -1;
}
fd = open(path, O_RDONLY | O_NONBLOCK);
if (fd < 0)
{
DPRINTF(E_LOG, L_PLAYER, "Could not open pipe for reading '%s': %s\n", path, strerror(errno));
return -1;
}
return fd;
}
static void
pipe_close(int fd)
{
if (fd >= 0)
close(fd);
}
static int
watch_add(struct pipe *pipe)
{
bool silent;
silent = (pipe->type == PIPE_METADATA);
pipe->fd = pipe_open(pipe->path, silent);
if (pipe->fd < 0)
return -1;
pipe->ev = event_new(evbase_pipe, pipe->fd, EV_READ, pipe->cb, pipe);
if (!pipe->ev)
{
DPRINTF(E_LOG, L_PLAYER, "Could not watch pipe for new data '%s'\n", pipe->path);
pipe_close(pipe->fd);
return -1;
}
event_add(pipe->ev, NULL);
return 0;
}
static void
watch_del(struct pipe *pipe)
{
if (pipe->ev)
event_free(pipe->ev);
pipe_close(pipe->fd);
pipe->fd = -1;
}
// If a read on pipe returns 0 it is an EOF, and we must close it and reopen it
// for renewed watching. The event will be freed and reallocated by this.
static int
watch_reset(struct pipe *pipe)
{
watch_del(pipe);
return watch_add(pipe);
}
static void
pipelist_add(struct pipe **list, struct pipe *pipe)
{
pipe->next = *list;
*list = pipe;
}
static void
pipelist_remove(struct pipe **list, struct pipe *pipe)
{
struct pipe *prev = NULL;
struct pipe *p;
for (p = *list; p; p = p->next)
{
if (p->id == pipe->id)
break;
prev = p;
}
if (!p)
return;
if (!prev)
*list = pipe->next;
else
prev->next = pipe->next;
pipe_free(pipe);
}
static struct pipe *
pipelist_find(struct pipe *list, int id)
{
struct pipe *p;
for (p = list; p; p = p->next)
{
if (id == p->id)
return p;
}
return NULL;
}
// Convert to macro?
static inline uint32_t
dmapval(const char s[4])
{
return ((s[0] << 24) | (s[1] << 16) | (s[2] << 8) | (s[3] << 0));
}
static void
pict_tmpfile_close(struct pipe_metadata *pm)
{
if (pm->pict_tmpfile_fd < 0)
return;
close(pm->pict_tmpfile_fd);
unlink(pm->pict_tmpfile_path);
pm->pict_tmpfile_fd = -1;
}
// Opens a tmpfile to store metadata artwork in. *ext is the extension to use
// for the tmpfile, eg .jpg or .png. Extension cannot be longer than
// PIPE_TMPFILE_TEMPLATE_EXTLEN.
static int
pict_tmpfile_recreate(struct pipe_metadata *pm, const char *ext)
{
int offset = strlen(PIPE_TMPFILE_TEMPLATE) - PIPE_TMPFILE_TEMPLATE_EXTLEN;
if (strlen(ext) > PIPE_TMPFILE_TEMPLATE_EXTLEN)
{
DPRINTF(E_LOG, L_PLAYER, "Invalid extension provided to pict_tmpfile_recreate: '%s'\n", ext);
return -1;
}
pict_tmpfile_close(pm);
strcpy(pm->pict_tmpfile_path, PIPE_TMPFILE_TEMPLATE);
strcpy(pm->pict_tmpfile_path + offset, ext);
pm->pict_tmpfile_fd = mkstemps(pm->pict_tmpfile_path, PIPE_TMPFILE_TEMPLATE_EXTLEN);
return pm->pict_tmpfile_fd;
}
static void
handle_progress(struct input_metadata *m, char *progress)
{
char *s;
char *ptr;
// Below must be signed to avoid casting in the calculations of pos_ms/len_ms
int64_t start;
int64_t pos;
int64_t end;
if (!(s = strtok_r(progress, "/", &ptr)))
return;
safe_atoi64(s, &start);
if (!(s = strtok_r(NULL, "/", &ptr)))
return;
safe_atoi64(s, &pos);
if (!(s = strtok_r(NULL, "/", &ptr)))
return;
safe_atoi64(s, &end);
if (!start || !pos || !end)
return;
// Note that negative positions are allowed and supported. A negative position
// of e.g. -1000 means that the track will start in one second.
m->pos_is_updated = true;
m->pos_ms = (pos - start) * 1000 / pipe_sample_rate;
m->len_ms = (end > start) ? (end - start) * 1000 / pipe_sample_rate : 0;
DPRINTF(E_DBG, L_PLAYER, "Received Shairport metadata progress: %" PRIi64 "/%" PRIi64 "/%" PRIi64 " => %d/%u ms\n", start, pos, end, m->pos_ms, m->len_ms);
}
static void
handle_flush(void)
{
player_playback_flush();
}
static void
handle_volume(const char *volume)
{
char *volume_next;
float airplay_volume;
int local_volume;
errno = 0;
airplay_volume = strtof(volume, &volume_next);
if ((errno == ERANGE) || (volume == volume_next))
{
DPRINTF(E_LOG, L_PLAYER, "Invalid Shairport airplay volume in string (%s): %s\n", volume,
(errno == ERANGE ? strerror(errno) : "First token is not a number."));
return;
}
if (strcmp(volume_next, ",0.00,0.00,0.00") != 0)
{
DPRINTF(E_DBG, L_PLAYER, "Not applying Shairport airplay volume while software volume control is enabled (%s)\n", volume);
return;
}
if (((int) airplay_volume) == -144)
{
DPRINTF(E_DBG, L_PLAYER, "Applying Shairport airplay volume ('mute', value: %.2f)\n", airplay_volume);
player_volume_set(0);
}
else if (airplay_volume >= -30.0 && airplay_volume <= 0.0)
{
local_volume = (int)(100.0 + (airplay_volume / 30.0 * 100.0));
DPRINTF(E_DBG, L_PLAYER, "Applying Shairport airplay volume (percent: %d, value: %.2f)\n", local_volume, airplay_volume);
player_volume_set(local_volume);
}
else
DPRINTF(E_LOG, L_PLAYER, "Shairport airplay volume out of range (-144.0, [-30.0 - 0.0]): %.2f\n", airplay_volume);
}
static void
handle_picture(struct input_metadata *m, uint8_t *data, int data_len)
{
const char *ext;
ssize_t ret;
free(m->artwork_url);
m->artwork_url = NULL;
if (data_len < 2 || data_len > PIPE_PICTURE_SIZE_MAX)
{
DPRINTF(E_WARN, L_PLAYER, "Unsupported picture size (%d) from Shairport metadata pipe\n", data_len);
return;
}
if (data[0] == 0xff && data[1] == 0xd8)
ext = ".jpg";
else if (data[0] == 0x89 && data[1] == 0x50)
ext = ".png";
else
{
DPRINTF(E_LOG, L_PLAYER, "Unsupported picture format from Shairport metadata pipe\n");
return;
}
pict_tmpfile_recreate(&pipe_metadata, ext);
if (pipe_metadata.pict_tmpfile_fd < 0)
{
DPRINTF(E_LOG, L_PLAYER, "Could not open tmpfile for pipe artwork '%s': %s\n", pipe_metadata.pict_tmpfile_path, strerror(errno));
return;
}
ret = write(pipe_metadata.pict_tmpfile_fd, data, data_len);
if (ret < 0)
{
DPRINTF(E_LOG, L_PLAYER, "Error writing artwork from metadata pipe to '%s': %s\n", pipe_metadata.pict_tmpfile_path, strerror(errno));
return;
}
else if (ret != data_len)
{
DPRINTF(E_LOG, L_PLAYER, "Incomplete write of artwork to '%s' (%zd/%d)\n", pipe_metadata.pict_tmpfile_path, ret, data_len);
return;
}
DPRINTF(E_DBG, L_PLAYER, "Wrote pipe artwork to '%s'\n", pipe_metadata.pict_tmpfile_path);
m->artwork_url = safe_asprintf("file:%s", pipe_metadata.pict_tmpfile_path);
}
// returns 1 on metadata found, 0 on nothing, -1 on error
static int
handle_item(struct input_metadata *m, const char *item)
{
mxml_node_t *xml;
mxml_node_t *haystack;
mxml_node_t *needle;
const char *s;
uint32_t type;
uint32_t code;
char **dstptr;
char *progress;
char *volume;
char *picture;
uint8_t *data;
int data_len;
int ret;
ret = 0;
xml = mxmlNewXML("1.0");
if (!xml)
return -1;
// DPRINTF(E_DBG, L_PLAYER, "Parsing %s\n", item);
haystack = mxmlLoadString(xml, item, MXML_NO_CALLBACK);
if (!haystack)
{
DPRINTF(E_LOG, L_PLAYER, "Could not parse pipe metadata\n");
goto out_error;
}
type = 0;
if ( (needle = mxmlFindElement(haystack, haystack, "type", NULL, NULL, MXML_DESCEND)) &&
(s = mxmlGetText(needle, NULL)) )
sscanf(s, "%8x", &type);
code = 0;
if ( (needle = mxmlFindElement(haystack, haystack, "code", NULL, NULL, MXML_DESCEND)) &&
(s = mxmlGetText(needle, NULL)) )
sscanf(s, "%8x", &code);
if (!type || !code)
{
DPRINTF(E_LOG, L_PLAYER, "No type (%d) or code (%d) in pipe metadata, aborting\n", type, code);
goto out_error;
}
if (code == dmapval("pfls"))
{
handle_flush();
goto out_nothing;
}
if (code == dmapval("asal"))
dstptr = &m->album;
else if (code == dmapval("asar"))
dstptr = &m->artist;
else if (code == dmapval("minm"))
dstptr = &m->title;
else if (code == dmapval("asgn"))
dstptr = &m->genre;
else if (code == dmapval("prgr"))
dstptr = &progress;
else if (code == dmapval("pvol"))
dstptr = &volume;
else if (code == dmapval("PICT"))
dstptr = &picture;
else
goto out_nothing;
if ( (needle = mxmlFindElement(haystack, haystack, "data", NULL, NULL, MXML_DESCEND)) &&
(s = mxmlGetText(needle, NULL)) )
{
pthread_mutex_lock(&pipe_metadata.lock);
data = b64_decode(&data_len, s);
if (!data)
{
DPRINTF(E_LOG, L_PLAYER, "Base64 decode of '%s' failed\n", s);
pthread_mutex_unlock(&pipe_metadata.lock);
goto out_error;
}
DPRINTF(E_DBG, L_PLAYER, "Read Shairport metadata (type=%8x, code=%8x, len=%d)\n", type, code, data_len);
if (dstptr == &progress)
{
progress = (char *)data;
handle_progress(m, progress);
free(data);
}
else if (dstptr == &volume)
{
volume = (char *)data;
handle_volume(volume);
free(data);
}
else if (dstptr == &picture)
{
handle_picture(m, data, data_len);
free(data);
}
else
{
free(*dstptr); // If m->x is already set, free it
*dstptr = (char *)data;
}
pthread_mutex_unlock(&pipe_metadata.lock);
ret = 1;
}
out_nothing:
mxmlDelete(xml);
return ret;
out_error:
mxmlDelete(xml);
return -1;
}
static char *
extract_item(struct evbuffer *evbuf)
{
struct evbuffer_ptr evptr;
size_t size;
char *item;
evptr = evbuffer_search(evbuf, "</item>", strlen("</item>"), NULL);
if (evptr.pos < 0)
return NULL;
size = evptr.pos + strlen("</item>") + 1;
item = malloc(size);
if (!item)
return NULL;
evbuffer_remove(evbuf, item, size - 1);
item[size - 1] = '\0';
return item;
}
static int
pipe_metadata_handle(struct input_metadata *m, struct evbuffer *evbuf)
{
char *item;
int found;
int ret;
found = 0;
while ((item = extract_item(evbuf)))
{
ret = handle_item(m, item);
free(item);
if (ret < 0)
return -1;
if (ret > 0)
found = 1;
}
return found;
}
/* ------------------------------ PIPE WATCHING ----------------------------- */
/* Thread: pipe */
// Some data arrived on a pipe we watch - let's autostart playback
static void
pipe_read_cb(evutil_socket_t fd, short event, void *arg)
{
struct pipe *pipe = arg;
struct player_status status;
int ret;
ret = player_get_status(&status);
if (status.id == pipe->id)
{
DPRINTF(E_INFO, L_PLAYER, "Pipe '%s' already playing\n", pipe->path);
return; // We are already playing the pipe
}
else if (ret < 0)
{
DPRINTF(E_LOG, L_PLAYER, "Pipe autostart of '%s' failed because state of player is unknown\n", pipe->path);
return;
}
DPRINTF(E_INFO, L_PLAYER, "Autostarting pipe '%s' (fd %d)\n", pipe->path, fd);
player_playback_stop();
ret = player_playback_start_byid(pipe->id);
if (ret < 0)
{
DPRINTF(E_LOG, L_PLAYER, "Autostarting pipe '%s' (fd %d) failed\n", pipe->path, fd);
return;
}
pipe_autostart_id = pipe->id;
}
static enum command_state
pipe_watch_reset(void *arg, int *retval)
{
union pipe_arg *cmdarg = arg;
struct pipe *pipe;
pipe_autostart_id = 0;
pipe = pipelist_find(pipe_watch_list, cmdarg->id);
*retval = watch_reset(pipe);
return COMMAND_END;
}
static enum command_state
pipe_watch_update(void *arg, int *retval)
{
union pipe_arg *cmdarg = arg;
struct pipe *pipelist;
struct pipe *pipe;
struct pipe *next;
int count;
if (cmdarg)
pipelist = cmdarg->pipelist;
else
pipelist = NULL;
// Removes pipes that are gone from the watchlist
for (pipe = pipe_watch_list; pipe; pipe = next)
{
next = pipe->next;
if (!pipelist_find(pipelist, pipe->id))
{
DPRINTF(E_DBG, L_PLAYER, "Pipe watch deleted: '%s'\n", pipe->path);
watch_del(pipe);
pipelist_remove(&pipe_watch_list, pipe); // Will free pipe
}
}
// Looks for new pipes and adds them to the watchlist
for (pipe = pipelist, count = 0; pipe; pipe = next, count++)
{
next = pipe->next;
if (count > PIPE_MAX_WATCH)
{
DPRINTF(E_LOG, L_PLAYER, "Max open pipes reached (%d), will not watch '%s'\n", PIPE_MAX_WATCH, pipe->path);
pipe_free(pipe);
continue;
}
if (!pipelist_find(pipe_watch_list, pipe->id))
{
DPRINTF(E_DBG, L_PLAYER, "Pipe watch added: '%s'\n", pipe->path);
watch_add(pipe);
pipelist_add(&pipe_watch_list, pipe); // Changes pipe->next
}
else
{
DPRINTF(E_DBG, L_PLAYER, "Pipe watch exists: '%s'\n", pipe->path);
pipe_free(pipe);
}
}
*retval = 0;
return COMMAND_END;
}
static void *
pipe_thread_run(void *arg)
{
event_base_dispatch(evbase_pipe);
pthread_exit(NULL);
}
/* --------------------------- METADATA PIPE HANDLING ----------------------- */
/* Thread: worker */
static void
pipe_metadata_watch_del(void *arg)
{
if (!pipe_metadata.pipe)
return;
evbuffer_free(pipe_metadata.evbuf);
watch_del(pipe_metadata.pipe);
pipe_free(pipe_metadata.pipe);
pipe_metadata.pipe = NULL;
pict_tmpfile_close(&pipe_metadata);
}
// Some metadata arrived on a pipe we watch
static void
pipe_metadata_read_cb(evutil_socket_t fd, short event, void *arg)
{
size_t len;
int ret;
ret = evbuffer_read(pipe_metadata.evbuf, pipe_metadata.pipe->fd, PIPE_READ_MAX);
if (ret < 0)
{
if (errno != EAGAIN)
pipe_metadata_watch_del(NULL);
return;
}
else if (ret == 0)
{
// Reset the pipe
ret = watch_reset(pipe_metadata.pipe);
if (ret < 0)
return;
goto readd;
}
len = evbuffer_get_length(pipe_metadata.evbuf);
if (len > PIPE_METADATA_BUFLEN_MAX)
{
DPRINTF(E_LOG, L_PLAYER, "Buffer for metadata pipe '%s' is full, discarding %zu bytes\n", pipe_metadata.pipe->path, len);
evbuffer_drain(pipe_metadata.evbuf, len);
goto readd;
}
ret = pipe_metadata_handle(&pipe_metadata.parsed, pipe_metadata.evbuf);
if (ret < 0)
{
pipe_metadata_watch_del(NULL);
return;
}
else if (ret > 0)
{
// Trigger notification in playback loop
pipe_metadata.is_new = 1;
}
readd:
if (pipe_metadata.pipe && pipe_metadata.pipe->ev)
event_add(pipe_metadata.pipe->ev, NULL);
}
static void
pipe_metadata_watch_add(void *arg)
{
char *base_path = arg;
char path[PATH_MAX];
int ret;
ret = snprintf(path, sizeof(path), "%s.metadata", base_path);
if ((ret < 0) || (ret > sizeof(path)))
return;
pipe_metadata_watch_del(NULL); // Just in case we somehow already have a metadata pipe open
pipe_metadata.pipe = pipe_create(path, 0, PIPE_METADATA, pipe_metadata_read_cb);
if (!pipe_metadata.pipe)
return;
pipe_metadata.evbuf = evbuffer_new();
ret = watch_add(pipe_metadata.pipe);
if (ret < 0)
{
evbuffer_free(pipe_metadata.evbuf);
pipe_free(pipe_metadata.pipe);
pipe_metadata.pipe = NULL;
return;
}
}
/* ----------------------- PIPE WATCH THREAD START/STOP --------------------- */
/* Thread: filescanner */
static void
pipe_thread_start(void)
{
CHECK_NULL(L_PLAYER, evbase_pipe = event_base_new());
CHECK_NULL(L_PLAYER, cmdbase = commands_base_new(evbase_pipe, NULL));
CHECK_ERR(L_PLAYER, pthread_create(&tid_pipe, NULL, pipe_thread_run, NULL));
thread_setname(tid_pipe, "pipe");
}
static void
pipe_thread_stop(void)
{
if (!tid_pipe)
return;
commands_exec_sync(cmdbase, pipe_watch_update, NULL, NULL);
commands_base_destroy(cmdbase);
pthread_join(tid_pipe, NULL);
event_base_free(evbase_pipe);
tid_pipe = 0;
}
// Makes a pipelist with pipe items from the db, returns NULL on no pipes
static struct pipe *
pipelist_create(void)
{
struct query_params qp;
struct db_media_file_info dbmfi;
struct pipe *head;
struct pipe *pipe;
char filter[32];
int id;
int ret;
memset(&qp, 0, sizeof(struct query_params));
qp.type = Q_ITEMS;
qp.filter = filter;
snprintf(filter, sizeof(filter), "f.data_kind = %d", DATA_KIND_PIPE);
ret = db_query_start(&qp);
if (ret < 0)
return NULL;
head = NULL;
while (((ret = db_query_fetch_file(&qp, &dbmfi)) == 0) && (dbmfi.id))
{
ret = safe_atoi32(dbmfi.id, &id);
if (ret < 0)
continue;
pipe = pipe_create(dbmfi.path, id, PIPE_PCM, pipe_read_cb);
pipelist_add(&head, pipe);
}
db_query_end(&qp);
return head;
}
// Queries the db to see if any pipes are present in the library. If so, starts
// the pipe thread to watch the pipes. If no pipes in library, it will shut down
// the pipe thread.
static void
pipe_listener_cb(short event_mask)
{
union pipe_arg *cmdarg;
cmdarg = malloc(sizeof(union pipe_arg));
if (!cmdarg)
return;
cmdarg->pipelist = pipelist_create();
if (!cmdarg->pipelist)
{
pipe_thread_stop();
free(cmdarg);
return;
}
if (!tid_pipe)
pipe_thread_start();
commands_exec_async(cmdbase, pipe_watch_update, cmdarg);
}
/* --------------------------- PIPE INPUT INTERFACE ------------------------- */
/* Thread: input */
static int
setup(struct input_source *source)
{
struct pipe *pipe;
int fd;
fd = pipe_open(source->path, 0);
if (fd < 0)
return -1;
CHECK_NULL(L_PLAYER, pipe = pipe_create(source->path, source->id, PIPE_PCM, NULL));
CHECK_NULL(L_PLAYER, source->evbuf = evbuffer_new());
pipe->fd = fd;
pipe->is_autostarted = (source->id == pipe_autostart_id);
worker_execute(pipe_metadata_watch_add, source->path, strlen(source->path) + 1, 0);
source->input_ctx = pipe;
source->quality.sample_rate = pipe_sample_rate;
source->quality.bits_per_sample = pipe_bits_per_sample;
source->quality.channels = 2;
return 0;
}
static int
stop(struct input_source *source)
{
struct pipe *pipe = source->input_ctx;
union pipe_arg *cmdarg;
DPRINTF(E_DBG, L_PLAYER, "Stopping pipe\n");
if (source->evbuf)
evbuffer_free(source->evbuf);
pipe_close(pipe->fd);
// Reset the pipe and start watching it again for new data. Must be async or
// we will deadlock from the stop in pipe_read_cb().
if (pipe_autostart && (cmdarg = malloc(sizeof(union pipe_arg))))
{
cmdarg->id = pipe->id;
commands_exec_async(cmdbase, pipe_watch_reset, cmdarg);
}
if (pipe_metadata.pipe)
worker_execute(pipe_metadata_watch_del, NULL, 0, 0);
pipe_free(pipe);
source->input_ctx = NULL;
source->evbuf = NULL;
return 0;
}
static int
play(struct input_source *source)
{
struct pipe *pipe = source->input_ctx;
short flags;
int ret;
ret = evbuffer_read(source->evbuf, pipe->fd, PIPE_READ_MAX);
if ((ret == 0) && (pipe->is_autostarted))
{
input_write(source->evbuf, NULL, INPUT_FLAG_EOF); // Autostop
stop(source);
return -1;
}
else if ((ret == 0) || ((ret < 0) && (errno == EAGAIN)))
{
input_wait();
return 0; // Loop
}
else if (ret < 0)
{
DPRINTF(E_LOG, L_PLAYER, "Could not read from pipe '%s': %s\n", source->path, strerror(errno));
input_write(NULL, NULL, INPUT_FLAG_ERROR);
stop(source);
return -1;
}
flags = (pipe_metadata.is_new ? INPUT_FLAG_METADATA : 0);
pipe_metadata.is_new = 0;
input_write(source->evbuf, &source->quality, flags);
return 0;
}
static int
metadata_get(struct input_metadata *metadata, struct input_source *source)
{
pthread_mutex_lock(&pipe_metadata.lock);
*metadata = pipe_metadata.parsed;
// Ownership transferred to caller, null all pointers in the struct
memset(&pipe_metadata.parsed, 0, sizeof(struct input_metadata));
pthread_mutex_unlock(&pipe_metadata.lock);
return 0;
}
// Thread: main
static int
init(void)
{
CHECK_ERR(L_PLAYER, mutex_init(&pipe_metadata.lock));
pipe_metadata.pict_tmpfile_fd = -1;
pipe_autostart = cfg_getbool(cfg_getsec(cfg, "library"), "pipe_autostart");
if (pipe_autostart)
{
pipe_listener_cb(0);
CHECK_ERR(L_PLAYER, listener_add(pipe_listener_cb, LISTENER_DATABASE));
}
pipe_sample_rate = cfg_getint(cfg_getsec(cfg, "library"), "pipe_sample_rate");
if (pipe_sample_rate != 44100 && pipe_sample_rate != 48000 && pipe_sample_rate != 88200 && pipe_sample_rate != 96000)
{
DPRINTF(E_FATAL, L_PLAYER, "The configuration of pipe_sample_rate is invalid: %d\n", pipe_sample_rate);
return -1;
}
pipe_bits_per_sample = cfg_getint(cfg_getsec(cfg, "library"), "pipe_bits_per_sample");
if (pipe_bits_per_sample != 16 && pipe_bits_per_sample != 32)
{
DPRINTF(E_FATAL, L_PLAYER, "The configuration of pipe_bits_per_sample is invalid: %d\n", pipe_bits_per_sample);
return -1;
}
return 0;
}
static void
deinit(void)
{
if (pipe_autostart)
{
listener_remove(pipe_listener_cb);
pipe_thread_stop();
}
CHECK_ERR(L_PLAYER, pthread_mutex_destroy(&pipe_metadata.lock));
}
struct input_definition input_pipe =
{
.name = "pipe",
.type = INPUT_TYPE_PIPE,
.disabled = 0,
.setup = setup,
.play = play,
.stop = stop,
.metadata_get = metadata_get,
.init = init,
.deinit = deinit,
};
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