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module-pipe-source.c

/* $Id: module-pipe-source.c 1426 2007-02-13 15:35:19Z ossman $ */

/***
  This file is part of PulseAudio.

  Copyright 2004-2006 Lennart Poettering

  PulseAudio is free software; you can redistribute it and/or modify
  it under the terms of the GNU Lesser General Public License as published
  by the Free Software Foundation; either version 2 of the License,
  or (at your option) any later version.

  PulseAudio 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 Lesser General Public License
  along with PulseAudio; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  USA.
***/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <stdlib.h>
#include <sys/stat.h>
#include <stdio.h>
#include <assert.h>
#include <errno.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <limits.h>

#include <pulse/xmalloc.h>

#include <pulsecore/core-error.h>
#include <pulsecore/iochannel.h>
#include <pulsecore/source.h>
#include <pulsecore/module.h>
#include <pulsecore/core-util.h>
#include <pulsecore/modargs.h>
#include <pulsecore/log.h>

#include "module-pipe-source-symdef.h"

PA_MODULE_AUTHOR("Lennart Poettering")
PA_MODULE_DESCRIPTION("UNIX pipe source")
PA_MODULE_VERSION(PACKAGE_VERSION)
PA_MODULE_USAGE(
        "source_name=<name for the source> "
        "file=<path of the FIFO> "
        "format=<sample format> "
        "channels=<number of channels> "
        "rate=<sample rate> "
        "channel_map=<channel map>")

#define DEFAULT_FIFO_NAME "/tmp/music.input"
#define DEFAULT_SOURCE_NAME "fifo_input"

struct userdata {
    pa_core *core;

    char *filename;

    pa_source *source;
    pa_iochannel *io;
    pa_module *module;
    pa_memchunk chunk;
};

static const char* const valid_modargs[] = {
    "file",
    "rate",
    "channels",
    "format",
    "source_name",
    "channel_map",
    NULL
};

static void do_read(struct userdata *u) {
    ssize_t r;
    pa_memchunk chunk;
    assert(u);

    if (!pa_iochannel_is_readable(u->io))
        return;

    pa_module_set_used(u->module, pa_idxset_size(u->source->outputs));

    if (!u->chunk.memblock) {
        u->chunk.memblock = pa_memblock_new(u->core->mempool, PIPE_BUF);
        u->chunk.index = chunk.length = 0;
    }

    assert(u->chunk.memblock && u->chunk.memblock->length > u->chunk.index);
    if ((r = pa_iochannel_read(u->io, (uint8_t*) u->chunk.memblock->data + u->chunk.index, u->chunk.memblock->length - u->chunk.index)) <= 0) {
        pa_log("read(): %s", pa_cstrerror(errno));
        return;
    }

    u->chunk.length = r;
    pa_source_post(u->source, &u->chunk);
    u->chunk.index += r;

    if (u->chunk.index >= u->chunk.memblock->length) {
        u->chunk.index = u->chunk.length = 0;
        pa_memblock_unref(u->chunk.memblock);
        u->chunk.memblock = NULL;
    }
}

static void io_callback(PA_GCC_UNUSED pa_iochannel *io, void*userdata) {
    struct userdata *u = userdata;
    assert(u);
    do_read(u);
}

int pa__init(pa_core *c, pa_module*m) {
    struct userdata *u = NULL;
    struct stat st;
    const char *p;
    int fd = -1;
    pa_sample_spec ss;
    pa_channel_map map;
    pa_modargs *ma = NULL;
    char *t;

    assert(c && m);

    if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
        pa_log("failed to parse module arguments");
        goto fail;
    }

    ss = c->default_sample_spec;
    if (pa_modargs_get_sample_spec_and_channel_map(ma, &ss, &map, PA_CHANNEL_MAP_DEFAULT) < 0) {
        pa_log("invalid sample format specification or channel map");
        goto fail;
    }

    mkfifo(p = pa_modargs_get_value(ma, "file", DEFAULT_FIFO_NAME), 0777);

    if ((fd = open(p, O_RDWR)) < 0) {
        pa_log("open('%s'): %s", p, pa_cstrerror(errno));
        goto fail;
    }

    pa_fd_set_cloexec(fd, 1);

    if (fstat(fd, &st) < 0) {
        pa_log("fstat('%s'): %s", p, pa_cstrerror(errno));
        goto fail;
    }

    if (!S_ISFIFO(st.st_mode)) {
        pa_log("'%s' is not a FIFO.", p);
        goto fail;
    }

    u = pa_xmalloc0(sizeof(struct userdata));

    u->filename = pa_xstrdup(p);
    u->core = c;

    if (!(u->source = pa_source_new(c, __FILE__, pa_modargs_get_value(ma, "source_name", DEFAULT_SOURCE_NAME), 0, &ss, &map))) {
        pa_log("failed to create source.");
        goto fail;
    }
    u->source->userdata = u;
    pa_source_set_owner(u->source, m);
    pa_source_set_description(u->source, t = pa_sprintf_malloc("Unix FIFO source '%s'", p));
    pa_xfree(t);

    u->io = pa_iochannel_new(c->mainloop, fd, -1);
    assert(u->io);
    pa_iochannel_set_callback(u->io, io_callback, u);

    u->chunk.memblock = NULL;
    u->chunk.index = u->chunk.length = 0;

    u->module = m;
    m->userdata = u;

    pa_modargs_free(ma);

    return 0;

fail:
    if (ma)
        pa_modargs_free(ma);

    if (fd >= 0)
        close(fd);

    pa__done(c, m);

    return -1;
}

void pa__done(pa_core *c, pa_module*m) {
    struct userdata *u;
    assert(c && m);

    if (!(u = m->userdata))
        return;

    if (u->chunk.memblock)
        pa_memblock_unref(u->chunk.memblock);

    pa_source_disconnect(u->source);
    pa_source_unref(u->source);
    pa_iochannel_free(u->io);

    assert(u->filename);
    unlink(u->filename);
    pa_xfree(u->filename);

    pa_xfree(u);
}

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