diff options
Diffstat (limited to 'pjmedia/src/pjmedia-codec/gsm.c')
| -rw-r--r-- | pjmedia/src/pjmedia-codec/gsm.c | 450 |
1 files changed, 450 insertions, 0 deletions
diff --git a/pjmedia/src/pjmedia-codec/gsm.c b/pjmedia/src/pjmedia-codec/gsm.c new file mode 100644 index 00000000..cc41612a --- /dev/null +++ b/pjmedia/src/pjmedia-codec/gsm.c @@ -0,0 +1,450 @@ +/* $Id$ */ +/* + * Copyright (C)2003-2006 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-codec/gsm.h> +#include <pjmedia/codec.h> +#include <pjmedia/errno.h> +#include <pjmedia/endpoint.h> +#include <pj/assert.h> +#include <pj/pool.h> +#include <pj/string.h> +#include <pj/os.h> +#include "gsm/gsm.h" + +/* Prototypes for GSM factory */ +static pj_status_t gsm_test_alloc( pjmedia_codec_factory *factory, + const pjmedia_codec_info *id ); +static pj_status_t gsm_default_attr( pjmedia_codec_factory *factory, + const pjmedia_codec_info *id, + pjmedia_codec_param *attr ); +static pj_status_t gsm_enum_codecs( pjmedia_codec_factory *factory, + unsigned *count, + pjmedia_codec_info codecs[]); +static pj_status_t gsm_alloc_codec( pjmedia_codec_factory *factory, + const pjmedia_codec_info *id, + pjmedia_codec **p_codec); +static pj_status_t gsm_dealloc_codec( pjmedia_codec_factory *factory, + pjmedia_codec *codec ); + +/* Prototypes for GSM implementation. */ +static pj_status_t gsm_codec_default_attr(pjmedia_codec *codec, + pjmedia_codec_param *attr); +static pj_status_t gsm_codec_init( pjmedia_codec *codec, + pj_pool_t *pool ); +static pj_status_t gsm_codec_open( pjmedia_codec *codec, + pjmedia_codec_param *attr ); +static pj_status_t gsm_codec_close( pjmedia_codec *codec ); +static pj_status_t gsm_codec_get_frames( pjmedia_codec *codec, + void *pkt, + pj_size_t pkt_size, + unsigned *frame_cnt, + pjmedia_frame frames[]); +static pj_status_t gsm_codec_encode( pjmedia_codec *codec, + const struct pjmedia_frame *input, + unsigned output_buf_len, + struct pjmedia_frame *output); +static pj_status_t gsm_codec_decode( pjmedia_codec *codec, + const struct pjmedia_frame *input, + unsigned output_buf_len, + struct pjmedia_frame *output); + +/* Definition for GSM codec operations. */ +static pjmedia_codec_op gsm_op = +{ + &gsm_codec_default_attr, + &gsm_codec_init, + &gsm_codec_open, + &gsm_codec_close, + &gsm_codec_get_frames, + &gsm_codec_encode, + &gsm_codec_decode +}; + +/* Definition for GSM codec factory operations. */ +static pjmedia_codec_factory_op gsm_factory_op = +{ + &gsm_test_alloc, + &gsm_default_attr, + &gsm_enum_codecs, + &gsm_alloc_codec, + &gsm_dealloc_codec +}; + +/* GSM factory */ +static struct gsm_codec_factory +{ + pjmedia_codec_factory base; + pjmedia_endpt *endpt; + pj_pool_t *pool; + pj_mutex_t *mutex; + pjmedia_codec codec_list; +} gsm_codec_factory; + +/* GSM codec private data. */ +struct gsm_private +{ + int dummy; +}; + + + +/* + * Initialize and register GSM codec factory to pjmedia endpoint. + */ +PJ_DEF(pj_status_t) pjmedia_codec_gsm_init( pjmedia_endpt *endpt ) +{ + pjmedia_codec_mgr *codec_mgr; + pj_status_t status; + + if (gsm_codec_factory.pool != NULL) + return PJ_SUCCESS; + + /* Create GSM codec factory. */ + gsm_codec_factory.base.op = &gsm_factory_op; + gsm_codec_factory.base.factory_data = NULL; + gsm_codec_factory.endpt = endpt; + + gsm_codec_factory.pool = pjmedia_endpt_create_pool(endpt, "gsm", 4000, + 4000); + if (!gsm_codec_factory.pool) + return PJ_ENOMEM; + + pj_list_init(&gsm_codec_factory.codec_list); + + /* Create mutex. */ + status = pj_mutex_create_simple(gsm_codec_factory.pool, "gsm", + &gsm_codec_factory.mutex); + if (status != PJ_SUCCESS) + goto on_error; + + /* Get the codec manager. */ + codec_mgr = pjmedia_endpt_get_codec_mgr(endpt); + if (!codec_mgr) { + status = PJ_EINVALIDOP; + goto on_error; + } + + /* Register codec factory to endpoint. */ + status = pjmedia_codec_mgr_register_factory(codec_mgr, + &gsm_codec_factory.base); + if (status != PJ_SUCCESS) + goto on_error; + + /* Done. */ + return PJ_SUCCESS; + +on_error: + pj_pool_release(gsm_codec_factory.pool); + gsm_codec_factory.pool = NULL; + return status; +} + + + +/* + * Unregister GSM codec factory from pjmedia endpoint and deinitialize + * the GSM codec library. + */ +PJ_DEF(pj_status_t) pjmedia_codec_gsm_deinit(void) +{ + pjmedia_codec_mgr *codec_mgr; + pj_status_t status; + + if (gsm_codec_factory.pool == NULL) + return PJ_SUCCESS; + + /* We don't want to deinit if there's outstanding codec. */ + pj_mutex_lock(gsm_codec_factory.mutex); + if (!pj_list_empty(&gsm_codec_factory.codec_list)) { + pj_mutex_unlock(gsm_codec_factory.mutex); + return PJ_EBUSY; + } + + /* Get the codec manager. */ + codec_mgr = pjmedia_endpt_get_codec_mgr(gsm_codec_factory.endpt); + if (!codec_mgr) { + pj_pool_release(gsm_codec_factory.pool); + gsm_codec_factory.pool = NULL; + return PJ_EINVALIDOP; + } + + /* Unregister GSM codec factory. */ + status = pjmedia_codec_mgr_unregister_factory(codec_mgr, + &gsm_codec_factory.base); + + /* Destroy mutex. */ + pj_mutex_destroy(gsm_codec_factory.mutex); + + /* Destroy pool. */ + pj_pool_release(gsm_codec_factory.pool); + gsm_codec_factory.pool = NULL; + + return status; +} + +/* + * Check if factory can allocate the specified codec. + */ +static pj_status_t gsm_test_alloc( pjmedia_codec_factory *factory, + const pjmedia_codec_info *info ) +{ + PJ_UNUSED_ARG(factory); + + /* Check payload type. */ + if (info->pt != PJMEDIA_RTP_PT_GSM) + return PJMEDIA_CODEC_EUNSUP; + + /* Ignore the rest, since it's static payload type. */ + + return PJ_SUCCESS; +} + +/* + * Generate default attribute. + */ +static pj_status_t gsm_default_attr (pjmedia_codec_factory *factory, + const pjmedia_codec_info *id, + pjmedia_codec_param *attr ) +{ + PJ_UNUSED_ARG(factory); + PJ_UNUSED_ARG(id); + + pj_memset(attr, 0, sizeof(pjmedia_codec_param)); + attr->sample_rate = 8000; + attr->avg_bps = 13200; + attr->pcm_bits_per_sample = 16; + attr->ptime = 20; + attr->pt = PJMEDIA_RTP_PT_GSM; + + /* Default all flag bits disabled. */ + + return PJ_SUCCESS; +} + +/* + * Enum codecs supported by this factory (i.e. only GSM!). + */ +static pj_status_t gsm_enum_codecs(pjmedia_codec_factory *factory, + unsigned *count, + pjmedia_codec_info codecs[]) +{ + PJ_UNUSED_ARG(factory); + PJ_ASSERT_RETURN(codecs && *count > 0, PJ_EINVAL); + + pj_memset(&codecs[0], 0, sizeof(pjmedia_codec_info)); + codecs[0].encoding_name = pj_str("GSM"); + codecs[0].pt = PJMEDIA_RTP_PT_GSM; + codecs[0].type = PJMEDIA_TYPE_AUDIO; + codecs[0].sample_rate = 8000; + + *count = 1; + + return PJ_SUCCESS; +} + +/* + * Allocate a new GSM codec instance. + */ +static pj_status_t gsm_alloc_codec( pjmedia_codec_factory *factory, + const pjmedia_codec_info *id, + pjmedia_codec **p_codec) +{ + pjmedia_codec *codec; + + PJ_ASSERT_RETURN(factory && id && p_codec, PJ_EINVAL); + PJ_ASSERT_RETURN(factory == &gsm_codec_factory.base, PJ_EINVAL); + + + pj_mutex_lock(gsm_codec_factory.mutex); + + /* Get free nodes, if any. */ + if (!pj_list_empty(&gsm_codec_factory.codec_list)) { + codec = gsm_codec_factory.codec_list.next; + pj_list_erase(codec); + } else { + codec = pj_pool_zalloc(gsm_codec_factory.pool, + sizeof(pjmedia_codec)); + PJ_ASSERT_RETURN(codec != NULL, PJ_ENOMEM); + } + + pj_mutex_unlock(gsm_codec_factory.mutex); + + pj_assert(codec->codec_data == NULL); + + *p_codec = codec; + return PJ_SUCCESS; +} + +/* + * Free codec. + */ +static pj_status_t gsm_dealloc_codec( pjmedia_codec_factory *factory, + pjmedia_codec *codec ) +{ + PJ_ASSERT_RETURN(factory && codec, PJ_EINVAL); + PJ_ASSERT_RETURN(factory == &gsm_codec_factory.base, PJ_EINVAL); + + /* Close codec, if it's not closed. */ + if (codec->codec_data != NULL) { + gsm_destroy(codec->codec_data); + codec->codec_data = NULL; + } + + /* Put in the free list. */ + pj_mutex_lock(gsm_codec_factory.mutex); + pj_list_push_front(&gsm_codec_factory.codec_list, codec); + pj_mutex_unlock(gsm_codec_factory.mutex); + + return PJ_SUCCESS; +} + +/* + * Get codec default attributes. + */ +static pj_status_t gsm_codec_default_attr( pjmedia_codec *codec, + pjmedia_codec_param *attr) +{ + return gsm_default_attr( codec->factory, NULL, attr); +} + +/* + * Init codec. + */ +static pj_status_t gsm_codec_init( pjmedia_codec *codec, + pj_pool_t *pool ) +{ + PJ_UNUSED_ARG(codec); + PJ_UNUSED_ARG(pool); + return PJ_SUCCESS; +} + +/* + * Open codec. + */ +static pj_status_t gsm_codec_open( pjmedia_codec *codec, + pjmedia_codec_param *attr ) +{ + pj_assert(codec->codec_data == NULL); + + PJ_UNUSED_ARG(attr); + + codec->codec_data = gsm_create(); + if (!codec->codec_data) + return PJMEDIA_CODEC_EFAILED; + + return PJ_SUCCESS; +} + +/* + * Close codec. + */ +static pj_status_t gsm_codec_close( pjmedia_codec *codec ) +{ + pj_assert(codec->codec_data != NULL); + + if (codec->codec_data) { + gsm_destroy(codec->codec_data); + codec->codec_data = NULL; + } + + return PJ_SUCCESS; +} + + +/* + * Get frames in the packet. + */ +static pj_status_t gsm_codec_get_frames( pjmedia_codec *codec, + void *pkt, + pj_size_t pkt_size, + unsigned *frame_cnt, + pjmedia_frame frames[]) +{ + unsigned count = 0; + + PJ_UNUSED_ARG(codec); + + PJ_ASSERT_RETURN(frame_cnt, PJ_EINVAL); + + while (pkt_size >= 33 && count < *frame_cnt) { + frames[0].type = PJMEDIA_FRAME_TYPE_AUDIO; + frames[0].buf = pkt; + frames[0].size = 33; + + pkt = ((char*)pkt) + 33; + pkt_size -= 33; + + ++count; + } + + *frame_cnt = count; + return PJ_SUCCESS; +} + +/* + * Encode frame. + */ +static pj_status_t gsm_codec_encode( pjmedia_codec *codec, + const struct pjmedia_frame *input, + unsigned output_buf_len, + struct pjmedia_frame *output) +{ + PJ_ASSERT_RETURN(codec && codec->codec_data && input && output, + PJ_EINVAL); + + if (output_buf_len < 33) + return PJMEDIA_CODEC_EFRMTOOSHORT; + + if (input->size < 320) + return PJMEDIA_CODEC_EPCMTOOSHORT; + + gsm_encode(codec->codec_data, (const short*)input->buf, + (unsigned char*)output->buf); + + output->size = 33; + output->type = PJMEDIA_FRAME_TYPE_AUDIO; + + return PJ_SUCCESS; +} + +/* + * Decode frame. + */ +static pj_status_t gsm_codec_decode( pjmedia_codec *codec, + const struct pjmedia_frame *input, + unsigned output_buf_len, + struct pjmedia_frame *output) +{ + PJ_ASSERT_RETURN(codec && codec->codec_data && input && output, + PJ_EINVAL); + + if (output_buf_len < 320) + return PJMEDIA_CODEC_EPCMTOOSHORT; + + if (input->size < 33) + return PJMEDIA_CODEC_EFRMTOOSHORT; + + gsm_decode(codec->codec_data, + (const unsigned char*)input->buf, + (short*)output->buf); + + output->size = 320; + output->type = PJMEDIA_FRAME_TYPE_AUDIO; + + return PJ_SUCCESS; +} |