oss.c 12.8 KB
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/*****************************************************************************
 * oss.c : OSS input module for vlc
 *****************************************************************************
 * Copyright (C) 2002-2009 the VideoLAN team
 * $Id$
 *
 * Authors: Benjamin Pracht <bigben at videolan dot org>
 *          Richard Hosking <richard at hovis dot net>
 *          Antoine Cellerier <dionoea at videolan d.t org>
 *          Dennis Lou <dlou99 at yahoo dot com>
 *
 * 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.
 *****************************************************************************/

/*****************************************************************************
 * Preamble
 *****************************************************************************/

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include <vlc_common.h>
#include <vlc_plugin.h>
#include <vlc_access.h>
#include <vlc_demux.h>
#include <vlc_input.h>

#include <ctype.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/mman.h>

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#ifdef HAVE_SYS_SOUNDCARD_H
#  include <sys/soundcard.h>
#endif
#ifdef HAVE_SOUNDCARD_H
#  include <soundcard.h>
#endif
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#include <poll.h>

/*****************************************************************************
 * Module descriptior
 *****************************************************************************/

static int  DemuxOpen ( vlc_object_t * );
static void DemuxClose( vlc_object_t * );


#define STEREO_TEXT N_( "Stereo" )
#define STEREO_LONGTEXT N_( \
    "Capture the audio stream in stereo." )
#define SAMPLERATE_TEXT N_( "Samplerate" )
#define SAMPLERATE_LONGTEXT N_( \
    "Samplerate of the captured audio stream, in Hz (eg: 11025, 22050, 44100, 48000)" )

#define CACHING_TEXT N_("Caching value in ms")
#define CACHING_LONGTEXT N_( \
    "Caching value for OSS captures. This " \
    "value should be set in milliseconds." )

#define OSS_DEFAULT "/dev/dsp"

#define CFG_PREFIX "oss-"

vlc_module_begin ()
    set_shortname( N_("OSS") )
    set_description( N_("OSS input") )
    set_category( CAT_INPUT )
    set_subcategory( SUBCAT_INPUT_ACCESS )

    add_shortcut( "oss" )
    set_capability( "access_demux", 10 )
    set_callbacks( DemuxOpen, DemuxClose )

    add_bool( CFG_PREFIX "stereo", true, NULL, STEREO_TEXT, STEREO_LONGTEXT,
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                true )
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    add_integer( CFG_PREFIX "samplerate", 48000, NULL, SAMPLERATE_TEXT,
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                SAMPLERATE_LONGTEXT, true )
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    add_integer( CFG_PREFIX "caching", DEFAULT_PTS_DELAY / 1000, NULL,
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                CACHING_TEXT, CACHING_LONGTEXT, true )
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vlc_module_end ()

/*****************************************************************************
 * Access: local prototypes
 *****************************************************************************/

static int DemuxControl( demux_t *, int, va_list );

static int Demux( demux_t * );

static block_t* GrabAudio( demux_t *p_demux );

static int OpenAudioDev( demux_t * );
static int OpenAudioDevOss( demux_t * );
static bool ProbeAudioDevOss( demux_t *, const char *psz_device );

struct buffer_t
{
    void *  start;
    size_t  length;
};

struct demux_sys_t
{
    const char *psz_device;  /* OSS device from MRL */

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    int  i_fd;
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    /* Audio */
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    int i_cache;
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    unsigned int i_sample_rate;
    bool b_stereo;
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    size_t i_max_frame_size;
    block_t *p_block;
    es_out_id_t *p_es;
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    int64_t i_next_demux_date; /* Used to handle oss:// as input-slave properly */
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};

static int FindMainDevice( demux_t *p_demux )
{
    msg_Dbg( p_demux, "opening device '%s'", p_demux->p_sys->psz_device );
    if( ProbeAudioDevOss( p_demux, p_demux->p_sys->psz_device ) )
    {
        msg_Dbg( p_demux, "'%s' is an audio device", p_demux->p_sys->psz_device );
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        p_demux->p_sys->i_fd = OpenAudioDev( p_demux );
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    }

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    if( p_demux->p_sys->i_fd < 0 )
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        return VLC_EGENERIC;
    return VLC_SUCCESS;
}

/*****************************************************************************
 * DemuxOpen: opens oss device, access_demux callback
 *****************************************************************************
 *
 * url: <oss device>::::
 *
 *****************************************************************************/
static int DemuxOpen( vlc_object_t *p_this )
{
    demux_t     *p_demux = (demux_t*)p_this;
    demux_sys_t *p_sys;

    /* Only when selected */
    if( *p_demux->psz_access == '\0' ) return VLC_EGENERIC;

    /* Set up p_demux */
    p_demux->pf_control = DemuxControl;
    p_demux->pf_demux = Demux;
    p_demux->info.i_update = 0;
    p_demux->info.i_title = 0;
    p_demux->info.i_seekpoint = 0;

    p_demux->p_sys = p_sys = calloc( 1, sizeof( demux_sys_t ) );
    if( p_sys == NULL ) return VLC_ENOMEM;

    p_sys->i_sample_rate = var_CreateGetInteger( p_demux, CFG_PREFIX "samplerate" );
    p_sys->b_stereo = var_CreateGetBool( p_demux, CFG_PREFIX "stereo" );
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    p_sys->i_cache = var_CreateGetInteger( p_demux, CFG_PREFIX "caching" );
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    p_sys->i_fd = -1;
    p_sys->p_es = NULL;
    p_sys->p_block = NULL;
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    p_sys->i_next_demux_date = -1;
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    if( p_demux->psz_path && *p_demux->psz_path )
        p_sys->psz_device = p_demux->psz_path;
    else
        p_sys->psz_device = OSS_DEFAULT;

    if( FindMainDevice( p_demux ) != VLC_SUCCESS )
    {
        DemuxClose( p_this );
        return VLC_EGENERIC;
    }

    return VLC_SUCCESS;
}

/*****************************************************************************
 * Close: close device, free resources
 *****************************************************************************/
static void DemuxClose( vlc_object_t *p_this )
{
    demux_t     *p_demux = (demux_t *)p_this;
    demux_sys_t *p_sys   = p_demux->p_sys;

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    if( p_sys->i_fd >= 0 ) close( p_sys->i_fd );
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    if( p_sys->p_block ) block_Release( p_sys->p_block );
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    free( p_sys );
}

/*****************************************************************************
 * DemuxControl:
 *****************************************************************************/
static int DemuxControl( demux_t *p_demux, int i_query, va_list args )
{
    demux_sys_t *p_sys = p_demux->p_sys;
    bool *pb;
    int64_t    *pi64;

    switch( i_query )
    {
        /* Special for access_demux */
        case DEMUX_CAN_PAUSE:
        case DEMUX_CAN_SEEK:
        case DEMUX_CAN_CONTROL_PACE:
            pb = (bool*)va_arg( args, bool * );
            *pb = false;
            return VLC_SUCCESS;

        case DEMUX_GET_PTS_DELAY:
            pi64 = (int64_t*)va_arg( args, int64_t * );
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            *pi64 = (int64_t)p_sys->i_cache * 1000;
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            return VLC_SUCCESS;

        case DEMUX_GET_TIME:
            pi64 = (int64_t*)va_arg( args, int64_t * );
            *pi64 = mdate();
            return VLC_SUCCESS;

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        case DEMUX_SET_NEXT_DEMUX_TIME:
            p_sys->i_next_demux_date = (int64_t)va_arg( args, int64_t );
            return VLC_SUCCESS;

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        /* TODO implement others */
        default:
            return VLC_EGENERIC;
    }

    return VLC_EGENERIC;
}

/*****************************************************************************
 * Demux: Processes the audio frame
 *****************************************************************************/
static int Demux( demux_t *p_demux )
{
    demux_sys_t *p_sys = p_demux->p_sys;

    struct pollfd fd;
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    fd.fd = p_sys->i_fd;
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    fd.events = POLLIN|POLLPRI;
    fd.revents = 0;

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    block_t *p_block = NULL;

    do
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    {
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        if( p_block )
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        {
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            es_out_Send( p_demux->out, p_sys->p_es, p_block );
            p_block = NULL;
        }

        /* Wait for data */
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        if( poll( &fd, 1, 10 ) ) /* Timeout after 0.01 seconds. Bigger delays are an issue when used with/as an input-slave since all the inputs run in the same thread. */
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        {
            if( fd.revents & (POLLIN|POLLPRI) )
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            {
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                p_block = GrabAudio( p_demux );
                if( p_block )
                    es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_block->i_pts );
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            }
        }
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    } while( p_block && p_sys->i_next_demux_date > 0 &&
             p_block->i_pts < p_sys->i_next_demux_date );

    if( p_block )
        es_out_Send( p_demux->out, p_sys->p_es, p_block );
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    return 1;
}

/*****************************************************************************
 * GrabAudio: Grab an audio frame
 *****************************************************************************/
static block_t* GrabAudio( demux_t *p_demux )
{
    demux_sys_t *p_sys = p_demux->p_sys;
    struct audio_buf_info buf_info;
    int i_read = 0, i_correct;
    block_t *p_block;

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    if( p_sys->p_block ) p_block = p_sys->p_block;
    else p_block = block_New( p_demux, p_sys->i_max_frame_size );
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    if( !p_block )
    {
        msg_Warn( p_demux, "cannot get block" );
        return 0;
    }

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    p_sys->p_block = p_block;
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    i_read = read( p_sys->i_fd, p_block->p_buffer,
                p_sys->i_max_frame_size );
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    if( i_read <= 0 ) return 0;

    p_block->i_buffer = i_read;
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    p_sys->p_block = 0;
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    /* Correct the date because of kernel buffering */
    i_correct = i_read;
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    if( ioctl( p_sys->i_fd, SNDCTL_DSP_GETISPACE, &buf_info ) == 0 )
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    {
        i_correct += buf_info.bytes;
    }

    /* Timestamp */
    p_block->i_pts = p_block->i_dts =
        mdate() - INT64_C(1000000) * (mtime_t)i_correct /
        2 / ( p_sys->b_stereo ? 2 : 1) / p_sys->i_sample_rate;

    return p_block;
}

/*****************************************************************************
 * OpenAudioDev: open and set up the audio device and probe for capabilities
 *****************************************************************************/
static int OpenAudioDevOss( demux_t *p_demux )
{
    int i_fd;
    int i_format;

    i_fd = open( p_demux->p_sys->psz_device, O_RDONLY | O_NONBLOCK );

    if( i_fd < 0 )
    {
        msg_Err( p_demux, "cannot open OSS audio device (%m)" );
        goto adev_fail;
    }

    i_format = AFMT_S16_LE;
    if( ioctl( i_fd, SNDCTL_DSP_SETFMT, &i_format ) < 0
        || i_format != AFMT_S16_LE )
    {
        msg_Err( p_demux,
                 "cannot set audio format (16b little endian) (%m)" );
        goto adev_fail;
    }

    if( ioctl( i_fd, SNDCTL_DSP_STEREO,
               &p_demux->p_sys->b_stereo ) < 0 )
    {
        msg_Err( p_demux, "cannot set audio channels count (%m)" );
        goto adev_fail;
    }

    if( ioctl( i_fd, SNDCTL_DSP_SPEED,
               &p_demux->p_sys->i_sample_rate ) < 0 )
    {
        msg_Err( p_demux, "cannot set audio sample rate (%m)" );
        goto adev_fail;
    }

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    p_demux->p_sys->i_max_frame_size = 6 * 1024;
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    return i_fd;

 adev_fail:

    if( i_fd >= 0 ) close( i_fd );
    return -1;
}

static int OpenAudioDev( demux_t *p_demux )
{
    demux_sys_t *p_sys = p_demux->p_sys;
    int i_fd = OpenAudioDevOss( p_demux );

    if( i_fd < 0 )
        return i_fd;

    msg_Dbg( p_demux, "opened adev=`%s' %s %dHz",
             p_sys->psz_device, p_sys->b_stereo ? "stereo" : "mono",
             p_sys->i_sample_rate );

    es_format_t fmt;
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    es_format_Init( &fmt, AUDIO_ES, VLC_CODEC_S16L );
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    fmt.audio.i_channels = p_sys->b_stereo ? 2 : 1;
    fmt.audio.i_rate = p_sys->i_sample_rate;
    fmt.audio.i_bitspersample = 16;
    fmt.audio.i_blockalign = fmt.audio.i_channels * fmt.audio.i_bitspersample / 8;
    fmt.i_bitrate = fmt.audio.i_channels * fmt.audio.i_rate * fmt.audio.i_bitspersample;

    msg_Dbg( p_demux, "new audio es %d channels %dHz",
             fmt.audio.i_channels, fmt.audio.i_rate );

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    p_sys->p_es = es_out_Add( p_demux->out, &fmt );
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    return i_fd;
}

/*****************************************************************************
 * ProbeAudioDev: probe audio for capabilities
 *****************************************************************************/
static bool ProbeAudioDevOss( demux_t *p_demux, const char *psz_device )
{
    int i_caps;
    int i_fd = open( psz_device, O_RDONLY | O_NONBLOCK );

    if( i_fd < 0 )
    {
        msg_Err( p_demux, "cannot open device %s for OSS audio (%m)", psz_device );
        goto open_failed;
    }

    /* this will fail if the device is video */
    if( ioctl( i_fd, SNDCTL_DSP_GETCAPS, &i_caps ) < 0 )
    {
        msg_Err( p_demux, "cannot get audio caps (%m)" );
        goto open_failed;
    }

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

    return true;

open_failed:
    if( i_fd >= 0 ) close( i_fd );
    return false;
}