/* * Copyright (C) 2001 CodeFactory AB * Copyright (C) 2001 Thomas Nyberg * Copyright (C) 2001-2002 Andy Wingo * Copyright (C) 2003 Benjamin Otte * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library 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 * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the Free * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #ifndef __GST_ALSA_H__ #define __GST_ALSA_H__ #define ALSA_PCM_NEW_HW_PARAMS_API #define ALSA_PCM_NEW_SW_PARAMS_API #include #include #include #include GST_DEBUG_CATEGORY_EXTERN (alsa_debug); #define GST_CAT_DEFAULT alsa_debug /* error checking for standard alsa functions */ /* NOTE: these functions require a GObject *this and can only be used in functions that return TRUE on success and FALSE on error */ #define SIMPLE_ERROR_CHECK(value) G_STMT_START{ \ int err = (value); \ if (err < 0) { \ GST_WARNING_OBJECT (this, "\"" #value "\": %s", snd_strerror (err)); \ return FALSE; \ } \ }G_STMT_END #ifdef G_HAVE_ISO_VARARGS #define ERROR_CHECK(value, ...) G_STMT_START{ \ int err = (value); \ if (err < 0) { \ GST_WARNING_OBJECT (this, __VA_ARGS__, snd_strerror (err)); \ return FALSE; \ } \ }G_STMT_END #elif defined(G_HAVE_GNUC_VARARGS) #define ERROR_CHECK(value, args...) G_STMT_START{ \ int err = (value); \ if (err < 0) { \ GST_WARNING_OBJECT (this, ## args, snd_strerror (err)); \ return FALSE; \ } \ }G_STMT_END #else #define ERROR_CHECK(value, args...) G_STMT_START{ \ int err = (value); \ if (err < 0) { \ GST_WARNING_OBJECT (this, snd_strerror (err)); \ return FALSE; \ } \ }G_STMT_END #endif #define GST_ALSA_MIN_RATE 8000 #define GST_ALSA_MAX_RATE 192000 #define GST_ALSA_MAX_TRACKS 64 /* we don't support more than 64 tracks */ #define GST_ALSA_MAX_CHANNELS 32 /* tracks can have up to 32 channels */ /* Mono is 1 channel ; the 5.1 standard is 6 channels. The value for GST_ALSA_MAX_CHANNELS comes from alsa/mixer.h. */ /* Max allowed discontinuity in time units between timestamp and playback pointer before killing/inserting samples. This should be big enough to allow smoothing errors on different video formats. */ #define GST_ALSA_DEFAULT_DISCONT (GST_SECOND / 10) G_BEGIN_DECLS #define GST_ALSA(obj) (G_TYPE_CHECK_INSTANCE_CAST(obj, GST_TYPE_ALSA, GstAlsa)) #define GST_ALSA_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST(klass, GST_TYPE_ALSA, GstAlsaClass)) #define GST_ALSA_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_ALSA, GstAlsaClass)) #define GST_IS_ALSA(obj) (G_TYPE_CHECK_INSTANCE_TYPE(obj, GST_TYPE_ALSA)) #define GST_IS_ALSA_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE(klass, GST_TYPE_ALSA)) #define GST_TYPE_ALSA (gst_alsa_get_type()) enum { GST_ALSA_OPEN = GST_ELEMENT_FLAG_LAST, GST_ALSA_RUNNING, GST_ALSA_CAPS_NEGO, GST_ALSA_FLAG_LAST = GST_ELEMENT_FLAG_LAST + 3 }; typedef enum { GST_ALSA_CAPS_PAUSE = 0, GST_ALSA_CAPS_RESUME, GST_ALSA_CAPS_SYNC_START /* add more */ } GstAlsaPcmCaps; #define GST_ALSA_CAPS_IS_SET(obj, flag) (GST_ALSA (obj)->pcm_caps & (1<<(flag))) #define GST_ALSA_CAPS_SET(obj, flag, set) G_STMT_START{ \ if (set) { (GST_ALSA (obj)->pcm_caps |= (1<<(flag))); } \ else { (GST_ALSA (obj)->pcm_caps &= ~(1<<(flag))); } \ }G_STMT_END typedef struct _GstAlsaClock GstAlsaClock; typedef struct _GstAlsaClockClass GstAlsaClockClass; typedef struct _GstAlsa GstAlsa; typedef struct _GstAlsaClass GstAlsaClass; typedef int (*GstAlsaTransmitFunction) (GstAlsa *this, snd_pcm_sframes_t *avail); typedef struct { snd_pcm_format_t format; guint rate; gint channels; } GstAlsaFormat; struct _GstAlsa { GstElement parent; /* array of GstAlsaPads */ GstPad * pad[GST_ALSA_MAX_TRACKS]; gchar * device; gchar * cardname; snd_pcm_t * handle; guint pcm_caps; /* capabilities of the pcm device, see GstAlsaPcmCaps */ snd_output_t * out; GstAlsaFormat * format; /* NULL if undefined */ gboolean mmap; /* use mmap transmit (fast) or read/write (sloooow) */ GstAlsaTransmitFunction transmit; GstCaps * cached_caps; /* we cache caps to speed up get_caps */ /* latency / performance parameters */ snd_pcm_uframes_t period_size; unsigned int period_count; gboolean autorecover; /* clocking */ GstAlsaClock * clock; /* our provided clock */ GstClock * ext_clock; /* externally set clock. */ snd_pcm_uframes_t played; /* samples transmitted since last sync This thing actually is our master clock. We will event insert silent samples or drop some to sync to incoming timestamps. */ snd_pcm_uframes_t captured; GstClockTime max_discont; /* max difference between current playback timestamp and buffers timestamps */ }; struct _GstAlsaClass { GstElementClass parent_class; snd_pcm_stream_t stream; /* different transmit functions */ GstAlsaTransmitFunction transmit_mmap; GstAlsaTransmitFunction transmit_rw; /* autodetected devices available */ GList *devices; }; GType gst_alsa_get_type (void); void gst_alsa_set_eos (GstAlsa * this); GstPadLinkReturn gst_alsa_link (GstPad * pad, const GstCaps * caps); GstCaps * gst_alsa_get_caps (GstPad * pad); GstCaps * gst_alsa_fixate (GstPad * pad, const GstCaps * caps); GstCaps * gst_alsa_caps (snd_pcm_format_t format, gint rate, gint channels); /* audio processing functions */ inline snd_pcm_sframes_t gst_alsa_update_avail (GstAlsa * this); inline gboolean gst_alsa_pcm_wait (GstAlsa * this); inline gboolean gst_alsa_start (GstAlsa * this); gboolean gst_alsa_xrun_recovery (GstAlsa * this); /* format conversions */ inline snd_pcm_uframes_t gst_alsa_timestamp_to_samples (GstAlsa * this, GstClockTime time); inline GstClockTime gst_alsa_samples_to_timestamp (GstAlsa * this, snd_pcm_uframes_t samples); inline snd_pcm_uframes_t gst_alsa_bytes_to_samples (GstAlsa * this, guint bytes); inline guint gst_alsa_samples_to_bytes (GstAlsa * this, snd_pcm_uframes_t samples); inline GstClockTime gst_alsa_bytes_to_timestamp (GstAlsa * this, guint bytes); inline guint gst_alsa_timestamp_to_bytes (GstAlsa * this, GstClockTime time); /* debugging functions (useful in gdb) - require running with --gst-debug=alsa:4 or better */ void gst_alsa_sw_params_dump (GstAlsa * this, snd_pcm_sw_params_t * sw_params); void gst_alsa_hw_params_dump (GstAlsa * this, snd_pcm_hw_params_t * hw_params); G_END_DECLS #endif /* __GST_ALSA_H__ */