/* $Id$ */ /* * Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com) * Copyright (C) 2003-2008 Benny Prijono * * 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 02111-1307 USA */ #include #include #include #include #include #define BYTES_PER_SAMPLE 2 #define SIGNATURE PJMEDIA_SIG_PORT_RESAMPLE struct resample_port { pjmedia_port base; pjmedia_port *dn_port; unsigned options; pjmedia_resample *resample_get; pjmedia_resample *resample_put; pj_int16_t *get_buf; pj_int16_t *put_buf; }; static pj_status_t resample_put_frame(pjmedia_port *this_port, pjmedia_frame *frame); static pj_status_t resample_get_frame(pjmedia_port *this_port, pjmedia_frame *frame); static pj_status_t resample_destroy(pjmedia_port *this_port); PJ_DEF(pj_status_t) pjmedia_resample_port_create( pj_pool_t *pool, pjmedia_port *dn_port, unsigned clock_rate, unsigned opt, pjmedia_port **p_port ) { const pj_str_t name = pj_str("resample"); struct resample_port *rport; pjmedia_audio_format_detail *d_afd, *r_afd; pj_status_t status; /* Validate arguments. */ PJ_ASSERT_RETURN(pool && dn_port && clock_rate && p_port, PJ_EINVAL); /* Only supports 16bit samples per frame */ PJ_ASSERT_RETURN(PJMEDIA_PIA_BITS(&dn_port->info) == 16, PJMEDIA_ENCBITS); d_afd = pjmedia_format_get_audio_format_detail(&dn_port->info.fmt, 1); /* Create and initialize port. */ rport = PJ_POOL_ZALLOC_T(pool, struct resample_port); PJ_ASSERT_RETURN(rport != NULL, PJ_ENOMEM); pjmedia_port_info_init(&rport->base.info, &name, SIGNATURE, clock_rate, d_afd->channel_count, BYTES_PER_SAMPLE * 8, clock_rate * d_afd->frame_time_usec / 1000000); rport->dn_port = dn_port; rport->options = opt; r_afd = pjmedia_format_get_audio_format_detail(&rport->base.info.fmt, 1); /* Create buffers. * We need separate buffer for get_frame() and put_frame() since * both functions may run simultaneously. */ rport->get_buf = (pj_int16_t*) pj_pool_alloc(pool, PJMEDIA_PIA_AVG_FSZ(&dn_port->info)); PJ_ASSERT_RETURN(rport->get_buf != NULL, PJ_ENOMEM); rport->put_buf = (pj_int16_t*) pj_pool_alloc(pool, PJMEDIA_PIA_AVG_FSZ(&dn_port->info)); PJ_ASSERT_RETURN(rport->put_buf != NULL, PJ_ENOMEM); /* Create "get_frame" resample */ status = pjmedia_resample_create(pool, (opt&PJMEDIA_RESAMPLE_USE_LINEAR)==0, (opt&PJMEDIA_RESAMPLE_USE_SMALL_FILTER)==0, d_afd->channel_count, d_afd->clock_rate, r_afd->clock_rate, PJMEDIA_PIA_SPF(&dn_port->info), &rport->resample_get); if (status != PJ_SUCCESS) return status; /* Create "put_frame" resample */ status = pjmedia_resample_create(pool, (opt&PJMEDIA_RESAMPLE_USE_LINEAR)==0, (opt&PJMEDIA_RESAMPLE_USE_SMALL_FILTER)==0, d_afd->channel_count, r_afd->clock_rate, d_afd->clock_rate, PJMEDIA_PIA_SPF(&rport->base.info), &rport->resample_put); /* Media port interface */ rport->base.get_frame = &resample_get_frame; rport->base.put_frame = &resample_put_frame; rport->base.on_destroy = &resample_destroy; /* Done */ *p_port = &rport->base; return PJ_SUCCESS; } static pj_status_t resample_put_frame(pjmedia_port *this_port, pjmedia_frame *frame) { struct resample_port *rport = (struct resample_port*) this_port; pjmedia_frame downstream_frame; /* Return if we don't have downstream port. */ if (rport->dn_port == NULL) { return PJ_SUCCESS; } if (frame->type == PJMEDIA_FRAME_TYPE_AUDIO) { pjmedia_resample_run( rport->resample_put, (const pj_int16_t*) frame->buf, rport->put_buf); downstream_frame.buf = rport->put_buf; downstream_frame.size = PJMEDIA_PIA_AVG_FSZ(&rport->dn_port->info); } else { downstream_frame.buf = frame->buf; downstream_frame.size = frame->size; } downstream_frame.type = frame->type; downstream_frame.timestamp.u64 = frame->timestamp.u64; return pjmedia_port_put_frame( rport->dn_port, &downstream_frame ); } static pj_status_t resample_get_frame(pjmedia_port *this_port, pjmedia_frame *frame) { struct resample_port *rport = (struct resample_port*) this_port; pjmedia_frame tmp_frame; pj_status_t status; /* Return silence if we don't have downstream port */ if (rport->dn_port == NULL) { pj_bzero(frame->buf, frame->size); return PJ_SUCCESS; } tmp_frame.buf = rport->get_buf; tmp_frame.size = PJMEDIA_PIA_AVG_FSZ(&rport->dn_port->info); tmp_frame.timestamp.u64 = frame->timestamp.u64; tmp_frame.type = PJMEDIA_FRAME_TYPE_AUDIO; status = pjmedia_port_get_frame( rport->dn_port, &tmp_frame); if (status != PJ_SUCCESS) return status; if (tmp_frame.type != PJMEDIA_FRAME_TYPE_AUDIO) { frame->type = tmp_frame.type; frame->timestamp = tmp_frame.timestamp; /* Copy whatever returned as long as the buffer size is enough */ frame->size = tmp_frame.size < PJMEDIA_PIA_AVG_FSZ(&rport->base.info) ? tmp_frame.size : PJMEDIA_PIA_AVG_FSZ(&rport->base.info); if (tmp_frame.size) { pjmedia_copy_samples((pj_int16_t*)frame->buf, (const pj_int16_t*)tmp_frame.buf, (unsigned)frame->size >> 1); } return PJ_SUCCESS; } pjmedia_resample_run( rport->resample_get, (const pj_int16_t*) tmp_frame.buf, (pj_int16_t*) frame->buf); frame->size = PJMEDIA_PIA_AVG_FSZ(&rport->base.info); frame->type = PJMEDIA_FRAME_TYPE_AUDIO; return PJ_SUCCESS; } static pj_status_t resample_destroy(pjmedia_port *this_port) { struct resample_port *rport = (struct resample_port*) this_port; if ((rport->options & PJMEDIA_RESAMPLE_DONT_DESTROY_DN)==0) { pjmedia_port_destroy(rport->dn_port); rport->dn_port = NULL; } if (rport->resample_get) { pjmedia_resample_destroy(rport->resample_get); rport->resample_get = NULL; } if (rport->resample_put) { pjmedia_resample_destroy(rport->resample_put); rport->resample_put = NULL; } return PJ_SUCCESS; }