| /* $Id$ */ |
| /* |
| * Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com) |
| * Copyright (C) 2003-2008 Benny Prijono <benny@prijono.org> |
| * |
| * 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 <pjmedia/resample.h> |
| #include <pjmedia/errno.h> |
| #include <pj/assert.h> |
| #include <pj/pool.h> |
| #include <pj/string.h> |
| |
| |
| #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; |
| } |
| |