path: root/tinyDAV/src/audio/alsa/tdav_consumer_alsa.c

/* Copyright (C) 2014 Mamadou DIOP.
*	
* This file is part of Open Source Doubango Framework.
*
* DOUBANGO 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 3 of the License, or
* (at your option) any later version.
*	
* DOUBANGO 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 DOUBANGO.
*/
#include "tinydav/audio/alsa/tdav_consumer_alsa.h"

#if HAVE_ALSA_ASOUNDLIB_H

#include "tinydav/audio/alsa/tdav_common_alsa.h"

#define ALSA_DEBUG_INFO(FMT, ...) TSK_DEBUG_INFO("[ALSA Consumer] " FMT, ##__VA_ARGS__)
#define ALSA_DEBUG_WARN(FMT, ...) TSK_DEBUG_WARN("[ALSA Consumer] " FMT, ##__VA_ARGS__)
#define ALSA_DEBUG_ERROR(FMT, ...) TSK_DEBUG_ERROR("[ALSA Consumer] " FMT, ##__VA_ARGS__)
#define ALSA_DEBUG_FATAL(FMT, ...) TSK_DEBUG_FATAL("[ALSA Consumer] " FMT, ##__VA_ARGS__)

typedef struct tdav_consumer_alsa_s
{
	TDAV_DECLARE_CONSUMER_AUDIO;

	tsk_bool_t b_muted;
	tsk_bool_t b_started;
	tsk_bool_t b_paused;

	tsk_thread_handle_t* tid[1];
	
	struct tdav_common_alsa_s alsa_common;
}
tdav_consumer_alsa_t;

static void* TSK_STDCALL _tdav_producer_alsa_playback_thread(void *param)
{
	tdav_consumer_alsa_t*  p_alsa = (tdav_consumer_alsa_t*)param;
	int err;

	ALSA_DEBUG_INFO("__playback_thread -- START");

	tsk_thread_set_priority_2(TSK_THREAD_PRIORITY_TIME_CRITICAL);
	
	while (p_alsa->b_started) {
		tdav_common_alsa_lock(&p_alsa->alsa_common);
		//snd_pcm_wait(p_alsa->alsa_common.p_handle, 20);
		//ALSA_DEBUG_INFO ("get (%d)", p_alsa->alsa_common.n_buff_size_in_bytes);
		err = tdav_consumer_audio_get(TDAV_CONSUMER_AUDIO(p_alsa), p_alsa->alsa_common.p_buff_ptr, p_alsa->alsa_common.n_buff_size_in_bytes); // requires 16bits, thread-safe
		//ALSA_DEBUG_INFO ("get returned %d", err);
		if (err < p_alsa->alsa_common.n_buff_size_in_bytes) {
			memset(((uint8_t*)p_alsa->alsa_common.p_buff_ptr) + err, 0, (p_alsa->alsa_common.n_buff_size_in_bytes - err));
			
		}
		if ((err = snd_pcm_writei(p_alsa->alsa_common.p_handle, p_alsa->alsa_common.p_buff_ptr, p_alsa->alsa_common.n_buff_size_in_samples)) != p_alsa->alsa_common.n_buff_size_in_samples) {
			if (err == -EPIPE) { // pipe broken
				err = snd_pcm_recover(p_alsa->alsa_common.p_handle, err, 0);
				if (err == 0) {
					ALSA_DEBUG_INFO ("recovered");
					goto next;
				}
			}
			ALSA_DEBUG_ERROR ("Failed to read data from audio interface failed (%d->%s)", err, snd_strerror(err));
			tdav_common_alsa_unlock(&p_alsa->alsa_common);
			goto bail;
		}
		tdav_consumer_audio_tick(TDAV_CONSUMER_AUDIO(p_alsa));
next:
		tdav_common_alsa_unlock(&p_alsa->alsa_common);
	}
bail:
	ALSA_DEBUG_INFO("__playback_thread -- STOP");
	return tsk_null;
}


/* ============ Media Consumer Interface ================= */
static int tdav_consumer_alsa_set(tmedia_consumer_t* self, const tmedia_param_t* param)
{
	tdav_consumer_alsa_t* p_alsa = (tdav_consumer_alsa_t*)self;
	int ret = 0;

	ret = tdav_consumer_audio_set(TDAV_CONSUMER_AUDIO(self), param);

	return ret;
}

static int tdav_consumer_alsa_prepare(tmedia_consumer_t* self, const tmedia_codec_t* codec)
{
	tdav_consumer_alsa_t*  p_alsa = (tdav_consumer_alsa_t*)self;
	int err = 0;
	ALSA_DEBUG_INFO("******* tdav_consumer_alsa_prepare ******");

	if (! p_alsa || !codec && codec->plugin) {
		ALSA_DEBUG_ERROR("Invalid parameter");
		return -1;
	}

	tdav_common_alsa_lock(&p_alsa->alsa_common);

	// Set using requested
	TMEDIA_CONSUMER(p_alsa)->audio.ptime = TMEDIA_CODEC_PTIME_AUDIO_DECODING(codec);
    	TMEDIA_CONSUMER(p_alsa)->audio.in.channels = TMEDIA_CODEC_CHANNELS_AUDIO_DECODING(codec);
    	TMEDIA_CONSUMER(p_alsa)->audio.in.rate = TMEDIA_CODEC_RATE_DECODING(codec);
	
	// Prepare
	err = tdav_common_alsa_prepare(&p_alsa->alsa_common, tsk_false/*is_record*/, TMEDIA_CONSUMER( p_alsa)->audio.ptime, TMEDIA_CONSUMER( p_alsa)->audio.in.channels, TMEDIA_CONSUMER( p_alsa)->audio.in.rate);
	if (err) {
		goto bail;
	}
	
	ALSA_DEBUG_INFO("prepared: req_channels=%d; req_rate=%d, resp_channels=%d; resp_rate=%d",
		TMEDIA_CONSUMER(p_alsa)->audio.in.channels, TMEDIA_CONSUMER(p_alsa)->audio.in.rate,
		p_alsa->alsa_common.channels, p_alsa->alsa_common.sample_rate);

	// Set using supported (up to the resampler to convert to requested)
	TMEDIA_CONSUMER(p_alsa)->audio.out.channels = p_alsa->alsa_common.channels;
	TMEDIA_CONSUMER(p_alsa)->audio.out.rate = p_alsa->alsa_common.sample_rate;
	
bail:
	tdav_common_alsa_unlock(&p_alsa->alsa_common);
	return err;
}

static int tdav_consumer_alsa_start(tmedia_consumer_t* self)
{
	tdav_consumer_alsa_t* p_alsa = (tdav_consumer_alsa_t*)self;
	int err = 0;

	ALSA_DEBUG_INFO("******* tdav_consumer_alsa_start ******");

	if (!p_alsa) {
		ALSA_DEBUG_ERROR("Invalid parameter");
		return -1;
	}
	
	tdav_common_alsa_lock(&p_alsa->alsa_common);

	if (p_alsa->b_started) {
		ALSA_DEBUG_WARN("Already started");
		goto bail;
	}

	/* start device */
	err = tdav_common_alsa_start(&p_alsa->alsa_common);
	if (err) {
		goto bail;
	}

	 /* start thread */
	 p_alsa->b_started = tsk_true;
	 tsk_thread_create(&p_alsa->tid[0], _tdav_producer_alsa_playback_thread,  p_alsa);

	ALSA_DEBUG_INFO("started");

bail:
	tdav_common_alsa_unlock(&p_alsa->alsa_common);
	return err;
}

static int tdav_consumer_alsa_consume(tmedia_consumer_t* self, const void* buffer, tsk_size_t size, const tsk_object_t* proto_hdr)
{
	int err = 0;
	tdav_consumer_alsa_t* p_alsa = (tdav_consumer_alsa_t*)self;
	
	if (!p_alsa || !buffer || !size) {
		ALSA_DEBUG_ERROR("Invalid paramter");
		return -1;
	}

	//tdav_common_alsa_lock(&p_alsa->alsa_common);
	
	if (!p_alsa->b_started) {
		ALSA_DEBUG_WARN("Not started");
		err = -2;
		goto bail;
	}
	
	if ((err = tdav_consumer_audio_put(TDAV_CONSUMER_AUDIO(p_alsa), buffer, size, proto_hdr))) {//thread-safe
		ALSA_DEBUG_WARN("Failed to put audio data to the jitter buffer");
		goto bail;
	}
	
bail:
	//tdav_common_alsa_unlock(&p_alsa->alsa_common);
	return err;
}

static int tdav_consumer_alsa_pause(tmedia_consumer_t* self)
{
	return 0;
}

static int tdav_consumer_alsa_stop(tmedia_consumer_t* self)
{
	tdav_consumer_alsa_t*  p_alsa = (tdav_consumer_alsa_t*)self;
	int err;

	if (!p_alsa) {
		ALSA_DEBUG_ERROR("Invalid parameter");
		return -1;
	}
	
	/* should be done here */
	p_alsa->b_started = tsk_false;

	err = tdav_common_alsa_stop(&p_alsa->alsa_common);

	/* stop thread */
	if (p_alsa->tid[0]) {
		tsk_thread_join(&(p_alsa->tid[0]));
	}
	
	ALSA_DEBUG_INFO("stopped");
	
	return 0;
}


//
//	ALSA consumer object definition
//
/* constructor */
static tsk_object_t* tdav_consumer_alsa_ctor(tsk_object_t * self, va_list * app)
{
	tdav_consumer_alsa_t *p_alsa = self;
	if (p_alsa) {
		ALSA_DEBUG_INFO("create");
		/* init base */
		tdav_consumer_audio_init(TDAV_CONSUMER_AUDIO(p_alsa));
		/* init self */
		tdav_common_alsa_init(&p_alsa->alsa_common);
	}
	return self;
}
/* destructor */
static tsk_object_t* tdav_consumer_alsa_dtor(tsk_object_t * self)
{ 
	tdav_consumer_alsa_t *p_alsa = self;
	if (p_alsa) {
		/* stop */
		if (p_alsa->b_started) {
			tdav_consumer_alsa_stop((tmedia_consumer_t*)p_alsa);
		}

		/* deinit base */
		tdav_consumer_audio_deinit(TDAV_CONSUMER_AUDIO(p_alsa));
		/* deinit self */
		tdav_common_alsa_deinit(&p_alsa->alsa_common);

		ALSA_DEBUG_INFO("*** destroyed ***");
	}

	return self;
}
/* object definition */
static const tsk_object_def_t tdav_consumer_alsa_def_s = 
{
	sizeof(tdav_consumer_alsa_t),
	tdav_consumer_alsa_ctor, 
	tdav_consumer_alsa_dtor,
	tdav_consumer_audio_cmp, 
};
/* plugin definition*/
static const tmedia_consumer_plugin_def_t tdav_consumer_alsa_plugin_def_s = 
{
	&tdav_consumer_alsa_def_s,
	
	tmedia_audio,
	"Linux ALSA consumer",
	
	tdav_consumer_alsa_set,
	tdav_consumer_alsa_prepare,
	tdav_consumer_alsa_start,
	tdav_consumer_alsa_consume,
	tdav_consumer_alsa_pause,
	tdav_consumer_alsa_stop
};
const tmedia_consumer_plugin_def_t *tdav_consumer_alsa_plugin_def_t = &tdav_consumer_alsa_plugin_def_s;

#endif /* #if HAVE_ALSA_ASOUNDLIB_H */