/*****************************************************************************
* audio_output.h : audio output thread interface
- * (c)1999 VideoLAN
*****************************************************************************
- * Required headers:
- * - <sys/soundcard.h> ( audio_buf_info )
- * - "common.h" ( boolean_t )
- * - "mtime.h" ( mtime_t )
- * - "vlc_thread.h" ( vlc_thread_t )
- *****************************************************************************/
-
-/* TODO :
+ * Copyright (C) 1999, 2000 VideoLAN
+ * $Id: audio_output.h,v 1.37 2001/05/30 17:03:11 sam Exp $
*
- * - Créer un flag destroy dans les fifos audio pour indiquer au thread audio
- * qu'il peut libérer la mémoire occupée par le buffer de la fifo lorsqu'il
- * le désire (fin du son ou fin du thread)
- * - Redéplacer les #define dans config.h
+ * Authors: Michel Kaempf <maxx@via.ecp.fr>
*
- */
-
-/*
- * Defines => "config.h"
- */
-
-/* Default output device. You probably should not change this. */
-#define AOUT_DEFAULT_DEVICE "/dev/dsp"
-
-/* Default audio output format (AFMT_S16_NE = Native Endianess) */
-#define AOUT_DEFAULT_FORMAT AFMT_S16_NE
-
-/* Default stereo mode (0 stands for mono, 1 for stereo) */
-#define AOUT_DEFAULT_STEREO 1
-
-/* Audio output rate, in Hz */
-#define AOUT_MIN_RATE 22050 /* ?? */
-#define AOUT_DEFAULT_RATE 44100
-#define AOUT_MAX_RATE 48000
-
-/* Number of audio output frames contained in an audio output fifo.
- * (AOUT_FIFO_SIZE + 1) must be a power of 2, in order to optimise the
- * %(AOUT_FIFO_SIZE + 1) operation with an &AOUT_FIFO_SIZE.
- * With 511 we have at least 511*384/2/48000=2 seconds of sound */
-#define AOUT_FIFO_SIZE 511
-
-/* Maximum number of audio fifos. The value of AOUT_MAX_FIFOS should be a power
- * of two, in order to optimize the '/AOUT_MAX_FIFOS' and '*AOUT_MAX_FIFOS'
- * operations with '>>' and '<<' (gcc changes this at compilation-time) */
-#define AOUT_MAX_FIFOS 2
-
-/* Duration (in microseconds) of an audio output buffer should be :
- * - short, in order to be able to play a new song very quickly (especially a
- * song from the interface)
- * - long, in order to perform the buffer calculations as few as possible */
-#define AOUT_BUFFER_DURATION 100000
-
-/*
- * Macros
- */
-#define AOUT_FIFO_ISEMPTY( fifo ) ( (fifo).l_end_frame == (fifo).i_start_frame )
-#define AOUT_FIFO_ISFULL( fifo ) ( ((((fifo).l_end_frame + 1) - (fifo).l_start_frame) & AOUT_FIFO_SIZE) == 0 )
+ * 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, USA.
+ *****************************************************************************/
/*****************************************************************************
- * aout_dsp_t
+ * aout_bank_t, p_aout_bank (global variable)
+ *****************************************************************************
+ * This global variable is accessed by any function using the audio output.
*****************************************************************************/
-typedef struct
+typedef struct aout_bank_s
{
- /* Path to the audio output device (default is set to "/dev/dsp") */
- char * psz_device;
- int i_fd;
+ /* Array to all the audio outputs */
+ struct aout_thread_s *pp_aout[ AOUT_MAX_THREADS ];
- /* Format of the audio output samples (see <sys/soundcard.h>) */
- int i_format;
- /* Following boolean is set to 0 if output sound is mono, 1 if stereo */
- boolean_t b_stereo;
- /* Rate of the audio output sound (in Hz) */
- long l_rate;
+ int i_count;
+ vlc_mutex_t lock; /* Global lock */
- /* Buffer information structure, used by aout_dspGetBufInfo() to store the
- * current state of the internal sound card buffer */
- audio_buf_info buf_info;
+} aout_bank_t;
-} aout_dsp_t;
+extern aout_bank_t *p_aout_bank;
/*****************************************************************************
* aout_increment_t
* order to avoid rounding problems and heavy computations, as the function
* that handles this structure only uses additions.
*****************************************************************************/
-typedef struct
+typedef struct aout_increment_s
{
/* The remainder is used to keep track of the fractional part of the
* index. */
/*****************************************************************************
* aout_fifo_t
*****************************************************************************/
-typedef struct
+typedef struct aout_fifo_s
{
/* See the fifo types below */
int i_type;
boolean_t b_die;
+ int i_fifo; /* Just to keep track of the fifo index */
+ int i_channels;
boolean_t b_stereo;
long l_rate;
} aout_fifo_t;
+#define AOUT_FIFO_ISEMPTY( fifo ) \
+ ( (fifo).l_end_frame == (fifo).l_start_frame )
+
+#define AOUT_FIFO_ISFULL( fifo ) \
+ ( ((((fifo).l_end_frame + 1) - (fifo).l_start_frame) & AOUT_FIFO_SIZE) == 0 )
+
#define AOUT_EMPTY_FIFO 0
#define AOUT_INTF_MONO_FIFO 1
#define AOUT_INTF_STEREO_FIFO 2
#define AOUT_ADEC_MONO_FIFO 3
#define AOUT_ADEC_STEREO_FIFO 4
+#define AOUT_ADEC_SPDIF_FIFO 5
/*****************************************************************************
- * aout_thread_t
+ * aout_thread_t : audio output thread descriptor
*****************************************************************************/
typedef struct aout_thread_s
{
vlc_thread_t thread_id;
boolean_t b_die;
-
- aout_dsp_t dsp;
+ boolean_t b_active;
vlc_mutex_t fifos_lock;
aout_fifo_t fifo[ AOUT_MAX_FIFOS ];
+ /* Plugin used and shortcuts to access its capabilities */
+ struct module_s * p_module;
+ int ( *pf_open ) ( p_aout_thread_t );
+ int ( *pf_setformat ) ( p_aout_thread_t );
+ long ( *pf_getbufinfo ) ( p_aout_thread_t, long );
+ void ( *pf_play ) ( p_aout_thread_t, byte_t *, int );
+ void ( *pf_close ) ( p_aout_thread_t );
+
void * buffer;
/* The s32 buffer is used to mix all the audio fifos together before
* converting them and storing them in the audio output buffer */
* will be played */
mtime_t date;
+ /* Path to the audio output device (default is set to "/dev/dsp") */
+ char * psz_device;
+ int i_fd;
+
+ /* The current volume */
+ int i_volume;
+ int i_savedvolume;
+ /* Format of the audio output samples */
+ int i_format;
+ /* Number of channels */
+ int i_channels;
+ /* Mono or Stereo sound */
+ boolean_t b_stereo;
+ /* Rate and gain of the audio output sound (in Hz) */
+ long l_rate;
+ long l_gain;
+
+ /* there might be some useful private structure, such as audio_buf_info
+ * for the OSS output */
+ p_aout_sys_t p_sys;
+
} aout_thread_t;
+/* Those are from <linux/soundcard.h> but are needed because of formats
+ * on other platforms */
+#define AOUT_FMT_U8 0x00000008
+#define AOUT_FMT_S16_LE 0x00000010 /* Little endian signed 16 */
+#define AOUT_FMT_S16_BE 0x00000020 /* Big endian signed 16 */
+#define AOUT_FMT_S8 0x00000040
+#define AOUT_FMT_U16_LE 0x00000080 /* Little endian U16 */
+#define AOUT_FMT_U16_BE 0x00000100 /* Big endian U16 */
+#define AOUT_FMT_AC3 0x00000400 /* Dolby Digital AC3 */
+
+#ifdef WORDS_BIGENDIAN
+#define AOUT_FMT_S16_NE AOUT_FMT_S16_BE
+#else
+#define AOUT_FMT_S16_NE AOUT_FMT_S16_LE
+#endif
+
+/* Number of samples in an AC3 frame */
+#define AC3_FRAME_SIZE 1536
+
+/* Size of a frame for spdif output */
+#define SPDIF_FRAME_SIZE 6144
+
/*****************************************************************************
* Prototypes
*****************************************************************************/
-aout_thread_t * aout_CreateThread ( int *pi_status );
-void aout_DestroyThread ( aout_thread_t *p_aout, int *pi_status );
+void aout_InitBank ( void );
+void aout_EndBank ( void );
+aout_thread_t * aout_CreateThread ( int *pi_status );
+void aout_DestroyThread ( aout_thread_t *, int * );
-aout_fifo_t * aout_CreateFifo ( aout_thread_t *p_aout, aout_fifo_t *p_fifo );
+aout_fifo_t * aout_CreateFifo ( int, int, long, long, long, void * );
void aout_DestroyFifo ( aout_fifo_t *p_fifo );
+void aout_FreeFifo ( aout_fifo_t *p_fifo );
+
projects / vlc / blobdiff