-/******************************************************************************
+/*****************************************************************************
* audio_output.h : audio output thread interface
- * (c)1999 VideoLAN
- ******************************************************************************
- * Required headers:
- * - <pthread.h> ( pthread_t )
- * - <sys/soundcard.h> ( audio_buf_info )
- * - "common.h" ( boolean_t )
- * - "mtime.h" ( mtime_t )
- ******************************************************************************/
-
-/* TODO :
+ *****************************************************************************
+ * Copyright (C) 1999, 2000 VideoLAN
+ * $Id: audio_output.h,v 1.48 2002/06/01 18:04:48 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>
+ * Cyril Deguet <asmax@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 samples (s16 integers) contained in an audio output frame...
- * - Layer I : a decoded frame contains 384 samples
- * - Layer II & III : a decoded frame contains 1152 = 3*384 samples */
-#define AOUT_FRAME_SIZE 384
-
-/* 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 )
-
-/******************************************************************************
- * aout_dsp_t
- ******************************************************************************/
-typedef struct
-{
- /* Path to the audio output device (default is set to "/dev/dsp") */
- char * psz_device;
- int i_fd;
-
- /* 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;
-
- /* Buffer information structure, used by aout_dspGetBufInfo() to store the
- * current state of the internal sound card buffer */
- audio_buf_info buf_info;
-
-} aout_dsp_t;
+ * 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_increment_t
- ******************************************************************************
+ *****************************************************************************
* This structure is used to keep the progression of an index up-to-date, in
* 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. */
- long l_remainder;
+ int i_r;
/*
* The increment structure is initialized with the result of an euclidean
* division :
*
- * l_euclidean_numerator l_euclidean_remainder
- * ----------------------- = l_euclidean_integer + -----------------------
- * l_euclidean_denominator l_euclidean_denominator
+ * i_x i_b
+ * ----- = i_a + -----
+ * i_y i_c
*
*/
- long l_euclidean_integer;
- long l_euclidean_remainder;
- long l_euclidean_denominator;
+ int i_a, i_b, i_c;
} aout_increment_t;
-/******************************************************************************
- * aout_frame_t
- ******************************************************************************/
-typedef s16 aout_frame_t[ AOUT_FRAME_SIZE ];
-
-/******************************************************************************
+/*****************************************************************************
* aout_fifo_t
- ******************************************************************************/
-typedef struct
+ *****************************************************************************/
+struct aout_fifo_s
{
- /* See the fifo types below */
- int i_type;
- boolean_t b_die;
+ /* See the fifo formats below */
+ int i_format;
+ int i_channels;
+ int i_rate;
+ int i_frame_size;
- boolean_t b_stereo;
- long l_rate;
+ vlc_bool_t b_die;
+ int i_fifo; /* Just to keep track of the fifo index */
- pthread_mutex_t data_lock;
- pthread_cond_t data_wait;
+ vlc_mutex_t data_lock;
+ vlc_cond_t data_wait;
- void * buffer;
+ u8 * buffer;
mtime_t * date;
+
/* The start frame is the first frame in the buffer that contains decoded
* audio data. It it also the first frame in the current timestamped frame
* area, ie the first dated frame in the decoded part of the buffer. :-p */
- long l_start_frame;
- boolean_t b_start_frame;
+ int i_start_frame;
+ vlc_bool_t b_start_frame;
/* The next frame is the end frame of the current timestamped frame area,
* ie the first dated frame after the start frame. */
- long l_next_frame;
- boolean_t b_next_frame;
+ int i_next_frame;
+ vlc_bool_t b_next_frame;
/* The end frame is the first frame, after the start frame, that doesn't
* contain decoded audio data. That's why the end frame is the first frame
* where the audio decoder can store its decoded audio frames. */
- long l_end_frame;
+ int i_end_frame;
- long l_unit;
+ /* Current index in p_aout->buffer */
+ int i_unit;
+ /* Max index in p_aout->buffer */
+ int i_unit_limit;
+ /* Structure used to calculate i_unit with a Bresenham algorithm */
aout_increment_t unit_increment;
+
/* The following variable is used to store the number of remaining audio
* units in the current timestamped frame area. */
- long l_units;
+ int i_units;
+};
-} aout_fifo_t;
+#define AOUT_FIFO_ISEMPTY( fifo ) \
+ ( (fifo).i_end_frame == (fifo).i_start_frame )
-#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_FIFO_ISFULL( fifo ) \
+ ( ((((fifo).i_end_frame + 1) - (fifo).i_start_frame) & AOUT_FIFO_SIZE) == 0 )
-/******************************************************************************
- * aout_thread_t
- ******************************************************************************/
-typedef struct aout_thread_s
-{
- pthread_t thread_id;
- boolean_t b_die;
+#define AOUT_FIFO_INC( i_index ) \
+ ( ((i_index) + 1) & AOUT_FIFO_SIZE )
- aout_dsp_t dsp;
+/* List of known fifo formats */
+#define AOUT_FIFO_NONE 0
+#define AOUT_FIFO_PCM 1
+#define AOUT_FIFO_SPDIF 2
- pthread_mutex_t fifos_lock;
+/*****************************************************************************
+ * aout_thread_t : audio output thread descriptor
+ *****************************************************************************/
+struct aout_thread_s
+{
+ VLC_COMMON_MEMBERS
+
+ vlc_mutex_t fifos_lock;
aout_fifo_t fifo[ AOUT_MAX_FIFOS ];
+ /* Plugin used and shortcuts to access its capabilities */
+ module_t * p_module;
+ int ( *pf_open ) ( aout_thread_t * );
+ int ( *pf_setformat ) ( aout_thread_t * );
+ int ( *pf_getbufinfo ) ( aout_thread_t * , int );
+ void ( *pf_play ) ( aout_thread_t * , byte_t *, int );
+ void ( *pf_close ) ( 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 */
/* The size of the audio output buffer is kept in audio units, as this is
* the only unit that is common with every audio decoder and audio fifo */
- long l_units;
+ int i_units;
- mtime_t date;
/* date is the moment where the first audio unit of the output buffer
- * should be played and is kept up-to-date with the following incremental
- * structure */
- aout_increment_t date_increment;
+ * will be played */
+ mtime_t date;
-} aout_thread_t;
+ /* The current volume */
+ int i_volume;
+ int i_savedvolume;
-/******************************************************************************
+ /* Format of the audio output samples, number of channels, and
+ * rate and gain (in Hz) of the audio output sound */
+ int i_format;
+ int i_channels;
+ int i_rate;
+
+ /* Latency of the audio output plugin, in bytes */
+ int i_latency;
+
+ /* there might be some useful private structure, such as audio_buf_info
+ * for the OSS output */
+ aout_sys_t * p_sys;
+};
+
+/* 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
- ******************************************************************************/
-int aout_Open ( aout_thread_t *p_aout );
-int aout_SpawnThread ( aout_thread_t *p_aout );
-void aout_CancelThread ( aout_thread_t *p_aout );
-void aout_Close ( aout_thread_t *p_aout );
-
-aout_fifo_t * aout_CreateFifo ( aout_thread_t *p_aout, aout_fifo_t *p_fifo );
-void aout_DestroyFifo ( aout_fifo_t *p_fifo );
+ *****************************************************************************/
+aout_thread_t * aout_CreateThread ( vlc_object_t *, int, int );
+void aout_DestroyThread ( aout_thread_t * );
+
+#define aout_CreateFifo(a,b,c,d,e,f) __aout_CreateFifo(CAST_TO_VLC_OBJECT(a),b,c,d,e,f)
+VLC_EXPORT( aout_fifo_t *, __aout_CreateFifo, ( vlc_object_t *, int, int, int, int, void * ) );
+VLC_EXPORT( void, aout_DestroyFifo, ( aout_fifo_t *p_fifo ) );
+ void aout_FreeFifo ( aout_fifo_t *p_fifo );
+
projects / vlc / blobdiff