oss.c 12.8 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46
/*****************************************************************************
 * 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>

Joris van Rooij's avatar
Joris van Rooij committed
47 48 49 50 51 52
#ifdef HAVE_SYS_SOUNDCARD_H
#  include <sys/soundcard.h>
#endif
#ifdef HAVE_SOUNDCARD_H
#  include <soundcard.h>
#endif
53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90

#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,
Rémi Denis-Courmont's avatar
Rémi Denis-Courmont committed
91
                true )
92
    add_integer( CFG_PREFIX "samplerate", 48000, NULL, SAMPLERATE_TEXT,
Rémi Denis-Courmont's avatar
Rémi Denis-Courmont committed
93
                SAMPLERATE_LONGTEXT, true )
94
    add_integer( CFG_PREFIX "caching", DEFAULT_PTS_DELAY / 1000, NULL,
Rémi Denis-Courmont's avatar
Rémi Denis-Courmont committed
95
                CACHING_TEXT, CACHING_LONGTEXT, true )
96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121
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 */

Antoine Cellerier's avatar
Antoine Cellerier committed
122
    int  i_fd;
123 124

    /* Audio */
125
    int i_cache;
126 127
    unsigned int i_sample_rate;
    bool b_stereo;
Antoine Cellerier's avatar
Antoine Cellerier committed
128 129 130
    size_t i_max_frame_size;
    block_t *p_block;
    es_out_id_t *p_es;
131 132

    int64_t i_next_demux_date; /* Used to handle oss:// as input-slave properly */
133 134 135 136 137 138 139 140
};

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 );
Antoine Cellerier's avatar
Antoine Cellerier committed
141
        p_demux->p_sys->i_fd = OpenAudioDev( p_demux );
142 143
    }

Antoine Cellerier's avatar
Antoine Cellerier committed
144
    if( p_demux->p_sys->i_fd < 0 )
145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175
        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" );
176
    p_sys->i_cache = var_CreateGetInteger( p_demux, CFG_PREFIX "caching" );
Antoine Cellerier's avatar
Antoine Cellerier committed
177 178 179
    p_sys->i_fd = -1;
    p_sys->p_es = NULL;
    p_sys->p_block = NULL;
180
    p_sys->i_next_demux_date = -1;
181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203

    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;

Antoine Cellerier's avatar
Antoine Cellerier committed
204
    if( p_sys->i_fd >= 0 ) close( p_sys->i_fd );
205

Antoine Cellerier's avatar
Antoine Cellerier committed
206
    if( p_sys->p_block ) block_Release( p_sys->p_block );
207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230
    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 * );
231
            *pi64 = (int64_t)p_sys->i_cache * 1000;
232 233 234 235 236 237 238
            return VLC_SUCCESS;

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

239 240 241 242
        case DEMUX_SET_NEXT_DEMUX_TIME:
            p_sys->i_next_demux_date = (int64_t)va_arg( args, int64_t );
            return VLC_SUCCESS;

243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258
        /* 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;
Antoine Cellerier's avatar
Antoine Cellerier committed
259
    fd.fd = p_sys->i_fd;
260 261 262
    fd.events = POLLIN|POLLPRI;
    fd.revents = 0;

263 264 265
    block_t *p_block = NULL;

    do
266
    {
267
        if( p_block )
268
        {
269 270 271 272 273
            es_out_Send( p_demux->out, p_sys->p_es, p_block );
            p_block = NULL;
        }

        /* Wait for data */
274
        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. */
275 276
        {
            if( fd.revents & (POLLIN|POLLPRI) )
277
            {
278 279 280
                p_block = GrabAudio( p_demux );
                if( p_block )
                    es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_block->i_pts );
281 282
            }
        }
283 284 285 286 287
    } 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 );
288 289 290 291 292 293 294 295 296 297 298 299 300 301

    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;

Antoine Cellerier's avatar
Antoine Cellerier committed
302 303
    if( p_sys->p_block ) p_block = p_sys->p_block;
    else p_block = block_New( p_demux, p_sys->i_max_frame_size );
304 305 306 307 308 309 310

    if( !p_block )
    {
        msg_Warn( p_demux, "cannot get block" );
        return 0;
    }

Antoine Cellerier's avatar
Antoine Cellerier committed
311
    p_sys->p_block = p_block;
312

Antoine Cellerier's avatar
Antoine Cellerier committed
313 314
    i_read = read( p_sys->i_fd, p_block->p_buffer,
                p_sys->i_max_frame_size );
315 316 317 318

    if( i_read <= 0 ) return 0;

    p_block->i_buffer = i_read;
Antoine Cellerier's avatar
Antoine Cellerier committed
319
    p_sys->p_block = 0;
320 321 322

    /* Correct the date because of kernel buffering */
    i_correct = i_read;
Antoine Cellerier's avatar
Antoine Cellerier committed
323
    if( ioctl( p_sys->i_fd, SNDCTL_DSP_GETISPACE, &buf_info ) == 0 )
324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374
    {
        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;
    }

Antoine Cellerier's avatar
Antoine Cellerier committed
375
    p_demux->p_sys->i_max_frame_size = 6 * 1024;
376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397

    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;
398
    es_format_Init( &fmt, AUDIO_ES, VLC_CODEC_S16L );
399 400 401 402 403 404 405 406 407 408

    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 );

Antoine Cellerier's avatar
Antoine Cellerier committed
409
    p_sys->p_es = es_out_Add( p_demux->out, &fmt );
410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442

    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;
}