myvtm/Other/unix/libaudioframework/audiobridge.c

#include "precompile.h"
#include "audiobridge.h"
#include "audiocontext.h"
#include "audiolog.h"


static apr_status_t read_and_write(audiostream_t *src, audiostream_t *dst, audioframe_t *frm)
{
	apr_status_t status = APR_EGENERAL;
	if (src && (audiostream_get_direction(src) & STREAM_DIR_READ)) {
		status = src->vtbl->read_frame(src, frm);
		if (status == APR_SUCCESS) {
			if (dst && (audiostream_get_direction(dst)&STREAM_DIR_WRITE)) {
				status = dst->vtbl->write_frame(dst, frm);
				if (status != APR_SUCCESS) {
					audio_log_v(AUDIO_LOG_LEVEL_ERROR,"audio bridge process_frame, write frame failed");
				}
			}
		} else {
			audio_log_v(AUDIO_LOG_LEVEL_ERROR,"audio bridge process_frame, read frame failed");
			if (dst && (audiostream_get_direction(dst)&STREAM_DIR_WRITE)) {
				frm->size = 0; // silence frm
				status = dst->vtbl->write_frame(dst, frm);
				if (status != APR_SUCCESS) {
					audio_log_v(AUDIO_LOG_LEVEL_ERROR,"audio bridge process_frame, write frame failed");
				}
			}
		}
	} else {
		if (dst && (audiostream_get_direction(dst)&STREAM_DIR_WRITE)) {
			frm->size = 0; // silence frm
			status = dst->vtbl->write_frame(dst, frm);
			if (status != APR_SUCCESS) {
				audio_log_v(AUDIO_LOG_LEVEL_ERROR,"audio bridge process_frame, write frame failed");
			}
		}
	}

	return status;
}

static void mix_frame(audioframe_t *x, audioframe_t *y, audioframe_t *out)
{
	if (x->size == 0) {
		memcpy(out->buffer, y->buffer, y->size);
		out->size = y->size;
	} else if (y->size == 0) {
		memcpy(out->buffer, x->buffer, x->size);
		out->size = x->size;
	} else {
		int i;
		int frame_samples = x->size >> 1;
		short *xx = (short*)&x->buffer[0];
		short *yy = (short*)&y->buffer[0];
		short *zz = (short*)&out->buffer[0];
		for (i = 0; i < frame_samples; ++i) {
			//int t = (((int)*xx + (int)*yy) * 3) >> 2;
			int t = (*xx + *yy) - (((*xx) * (*yy)) >> 0x10);
			if (t > 32767)
				t = 32767;
			if (t < -32767)
				t = -32767;
			*zz = (short)t;
			xx++;
			yy++;
			zz++;
		}
		out->size = x->size;
	}
}

static void process_frame(void *self)
{
	audiobridge_t *bridge = CONTAINING_RECORD(self, audiobridge_t, base);
	char left_buf[SUGGEST_FRAME_SIZE];
	char right_buf[SUGGEST_FRAME_SIZE];
	audioframe_t left_frm = {&left_buf[0], SUGGEST_FRAME_SIZE, 0};
	audioframe_t right_frm = {&right_buf[0], SUGGEST_FRAME_SIZE, 0};
	apr_status_t left_status, right_status;
	left_status = read_and_write(bridge->leg_stream[AUDIO_BRIDGE_LEG_LEFT], bridge->leg_stream[AUDIO_BRIDGE_LEG_RIGHT], &left_frm);
	right_status = read_and_write(bridge->leg_stream[AUDIO_BRIDGE_LEG_RIGHT], bridge->leg_stream[AUDIO_BRIDGE_LEG_LEFT], &right_frm);
	if (bridge->rec_stream && (audiostream_get_direction(bridge->rec_stream)&STREAM_DIR_WRITE)) {
		apr_status_t status = APR_EGENERAL;
		if (left_status == APR_SUCCESS && right_status != APR_SUCCESS) {
			status = bridge->rec_stream->vtbl->write_frame(bridge->rec_stream, &left_frm);
		} else if (left_status != APR_SUCCESS && right_status == APR_SUCCESS) {
			status = bridge->rec_stream->vtbl->write_frame(bridge->rec_stream, &right_frm);
		} else if (left_status == APR_SUCCESS && right_status == APR_SUCCESS) {
			char rec_buf[SUGGEST_FRAME_SIZE];
			audioframe_t rec_frm = {&rec_buf[0], SUGGEST_FRAME_SIZE, 0};
			mix_frame(&left_frm, &right_frm, &rec_frm);
			status = bridge->rec_stream->vtbl->write_frame(bridge->rec_stream, &rec_frm);
		}
		if (status != APR_SUCCESS) {
			audio_log_v(AUDIO_LOG_LEVEL_ERROR,"audio bridge process_frame, write frame to recorder stream failed");
		}
	}
}

static void process_frame1(void *self)
{
	int i;
	audiobridge_t *bridge = CONTAINING_RECORD(self, audiobridge_t, base);
	for (i = 0; i < 2; ++i) {
		char buf[SUGGEST_FRAME_SIZE];
		audiostream_t *src;
		audiostream_t *dst;
		apr_status_t status;
		audioframe_t frm = {&buf[0], SUGGEST_FRAME_SIZE, 0};
		src = bridge->leg_stream[i];
		dst = bridge->leg_stream[1-i];
		if (src && (audiostream_get_direction(src) & STREAM_DIR_READ)) {
			status = src->vtbl->read_frame(src, &frm);
			if (status == APR_SUCCESS) {
				if (dst && (audiostream_get_direction(dst)&STREAM_DIR_WRITE)) {
					status = dst->vtbl->write_frame(dst, &frm);
					if (status != APR_SUCCESS) {
						audio_log_v(AUDIO_LOG_LEVEL_ERROR,"audio bridge process_frame, write frame failed");
					}
				}
			} else {
				audio_log_v(AUDIO_LOG_LEVEL_ERROR,"audio bridge process_frame, read frame failed");
				if (dst && (audiostream_get_direction(dst)&STREAM_DIR_WRITE)) {
					frm.size = 0; // silence frm
					status = dst->vtbl->write_frame(dst, &frm);
					if (status != APR_SUCCESS) {
						audio_log_v(AUDIO_LOG_LEVEL_ERROR,"audio bridge process_frame, write frame failed");
					}
				}
			}
		} else {
			if (dst && (audiostream_get_direction(dst)&STREAM_DIR_WRITE)) {
				frm.size = 0; // silence frm
				status = dst->vtbl->write_frame(dst, &frm);
				if (status != APR_SUCCESS) {
					audio_log_v(AUDIO_LOG_LEVEL_ERROR,"audio bridge process_frame, write frame failed");
				}
			}
		}
	}
}

static audiodriver_vtbl_t g_driver_vtbl = {
	&process_frame,
};

apr_status_t audiobridge_create(apr_pool_t *pool, audioengine_t *engine, audiobridge_t **p_bridge)
{
	audiobridge_t *bridge = apr_palloc(pool, sizeof(audiobridge_t));
	if (NULL == bridge){
		return APR_ENOPOOL;
	}
	memset(bridge, 0, sizeof(audiobridge_t));
	bridge->leg_stream[0] = NULL;
	bridge->leg_stream[1] = NULL;
	bridge->rec_stream = NULL;
	audiodriver_init(engine, &g_driver_vtbl, &bridge->base);

	*p_bridge = bridge;

	return APR_SUCCESS;
}

void audiobridge_destroy(audiobridge_t *bridge)
{
	//...
}

void audiobridge_set_leg(audiobridge_t *bridge, int leg, audiostream_t *stream)
{
	bridge->leg_stream[leg] = stream;
}

audiostream_t* audiobridge_get_leg(audiobridge_t *bridge, int leg)
{
	return bridge->leg_stream[leg];
}

void audiobridge_set_recorder(audiobridge_t *bridge, audiostream_t *stream)
{
	bridge->rec_stream = stream;
}

audiostream_t* audiobridge_get_recorder(audiobridge_t *bridge)
{
	return bridge->rec_stream;
}