/* $Id$ */ /* * Copyright (C) 2008-2009 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 #include #include #include #include #include #include #include /* * Only build this file if PJMEDIA_HAS_G7221_CODEC != 0 */ #if defined(PJMEDIA_HAS_G7221_CODEC) && PJMEDIA_HAS_G7221_CODEC!=0 #include "../../third_party/g7221/common/defs.h" #define THIS_FILE "g7221.c" /* Codec tag, it is the SDP encoding name and also MIME subtype name */ #define CODEC_TAG "G7221" /* Sampling rates definition */ #define WB_SAMPLE_RATE 16000 #define UWB_SAMPLE_RATE 32000 /* Maximum number of samples per frame. */ #define MAX_SAMPLES_PER_FRAME (UWB_SAMPLE_RATE * 20 / 1000) /* Maximum number of codec params. */ #define MAX_CODEC_MODES 8 #define START_RSV_MODES_IDX 6 /* Prototypes for G722.1 codec factory */ static pj_status_t test_alloc( pjmedia_codec_factory *factory, const pjmedia_codec_info *id ); static pj_status_t default_attr( pjmedia_codec_factory *factory, const pjmedia_codec_info *id, pjmedia_codec_param *attr ); static pj_status_t enum_codecs( pjmedia_codec_factory *factory, unsigned *count, pjmedia_codec_info codecs[]); static pj_status_t alloc_codec( pjmedia_codec_factory *factory, const pjmedia_codec_info *id, pjmedia_codec **p_codec); static pj_status_t dealloc_codec( pjmedia_codec_factory *factory, pjmedia_codec *codec ); /* Prototypes for G722.1 codec implementation. */ static pj_status_t codec_init( pjmedia_codec *codec, pj_pool_t *pool ); static pj_status_t codec_open( pjmedia_codec *codec, pjmedia_codec_param *attr ); static pj_status_t codec_close( pjmedia_codec *codec ); static pj_status_t codec_modify(pjmedia_codec *codec, const pjmedia_codec_param *attr ); static pj_status_t codec_parse( pjmedia_codec *codec, void *pkt, pj_size_t pkt_size, const pj_timestamp *ts, unsigned *frame_cnt, pjmedia_frame frames[]); static pj_status_t codec_encode( pjmedia_codec *codec, const struct pjmedia_frame *input, unsigned output_buf_len, struct pjmedia_frame *output); static pj_status_t codec_decode( pjmedia_codec *codec, const struct pjmedia_frame *input, unsigned output_buf_len, struct pjmedia_frame *output); static pj_status_t codec_recover( pjmedia_codec *codec, unsigned output_buf_len, struct pjmedia_frame *output); /* Definition for G722.1 codec operations. */ static pjmedia_codec_op codec_op = { &codec_init, &codec_open, &codec_close, &codec_modify, &codec_parse, &codec_encode, &codec_decode, &codec_recover }; /* Definition for G722.1 codec factory operations. */ static pjmedia_codec_factory_op codec_factory_op = { &test_alloc, &default_attr, &enum_codecs, &alloc_codec, &dealloc_codec }; /* Structure of G722.1 mode */ typedef struct codec_mode { pj_bool_t enabled; /* Is this mode enabled? */ pj_uint8_t pt; /* Payload type. */ unsigned sample_rate; /* Default sampling rate to be used.*/ unsigned bitrate; /* Bitrate. */ char bitrate_str[8]; /* Bitrate in string. */ } codec_mode; /* G722.1 codec factory */ static struct codec_factory { pjmedia_codec_factory base; /**< Base class. */ pjmedia_endpt *endpt; /**< PJMEDIA endpoint instance. */ pj_pool_t *pool; /**< Codec factory pool. */ pj_mutex_t *mutex; /**< Codec factory mutex. */ unsigned mode_count; /**< Number of G722.1 modes. */ codec_mode modes[MAX_CODEC_MODES]; /**< The G722.1 modes. */ unsigned mode_rsv_start;/**< Start index of G722.1 non- standard modes, currently there can only be up to two non-standard modes enabled at the same time. */ } codec_factory; /* G722.1 codec private data. */ typedef struct codec_private { pj_pool_t *pool; /**< Pool for each instance. */ pj_bool_t plc_enabled; /**< PLC enabled? */ pj_bool_t vad_enabled; /**< VAD enabled? */ pjmedia_silence_det *vad; /**< PJMEDIA VAD instance. */ pj_timestamp last_tx; /**< Timestamp of last transmit.*/ /* ITU ref implementation seems to leave the codec engine states to be * managed by the application, so here we go. */ /* Common engine state */ pj_uint16_t samples_per_frame; /**< Samples per frame. */ pj_uint16_t bitrate; /**< Coded stream bitrate. */ pj_uint16_t frame_size; /**< Coded frame size. */ pj_uint16_t frame_size_bits; /**< Coded frame size in bits. */ pj_uint16_t number_of_regions; /**< Number of regions. */ /* Encoder specific state */ Word16 *enc_old_frame; /* Decoder specific state */ Word16 *dec_old_frame; Rand_Obj dec_randobj; Word16 dec_old_mag_shift; Word16 *dec_old_mlt_coefs; } codec_private_t; /* * Helper function for looking up mode based on payload type. */ static codec_mode* lookup_mode(unsigned pt) { codec_mode* mode = NULL; unsigned i; for (i = 0; i < codec_factory.mode_count; ++i) { mode = &codec_factory.modes[i]; if (mode->pt == pt) break; } return mode; } /* * Helper function to validate G722.1 mode. Valid modes are defined as: * 1. sample rate must be 16kHz or 32kHz, * 2. bitrate: * - for sampling rate 16kHz: 16000 to 32000 bps, it must be a multiple * of 400 (to keep RTP payload octed-aligned) * - for sampling rate 32kHz: 24000 to 48000 bps, it must be a multiple * of 400 (to keep RTP payload octed-aligned) */ static pj_bool_t validate_mode(unsigned sample_rate, unsigned bitrate) { if (sample_rate == WB_SAMPLE_RATE) { if (bitrate < 16000 || bitrate > 32000 || ((bitrate-16000) % 400 != 0)) { return PJ_FALSE; } } else if (sample_rate == UWB_SAMPLE_RATE) { if (bitrate < 24000 || bitrate > 48000 || ((bitrate-24000) % 400 != 0)) { return PJ_FALSE; } } else { return PJ_FALSE; } return PJ_TRUE; } /* * Initialize and register G722.1 codec factory to pjmedia endpoint. */ PJ_DEF(pj_status_t) pjmedia_codec_g7221_init( pjmedia_endpt *endpt ) { pjmedia_codec_mgr *codec_mgr; codec_mode *mode; pj_status_t status; if (codec_factory.pool != NULL) { /* Already initialized. */ return PJ_SUCCESS; } /* Initialize codec modes, by default all standard bitrates are enabled */ mode = &codec_factory.modes[codec_factory.mode_count++]; mode->enabled = PJ_TRUE; mode->pt = PJMEDIA_RTP_PT_G722_1_24; mode->sample_rate = WB_SAMPLE_RATE; mode->bitrate = 24000; pj_utoa(mode->bitrate, mode->bitrate_str); mode = &codec_factory.modes[codec_factory.mode_count++]; mode->enabled = PJ_TRUE; mode->pt = PJMEDIA_RTP_PT_G722_1_32; mode->sample_rate = WB_SAMPLE_RATE; mode->bitrate = 32000; pj_utoa(mode->bitrate, mode->bitrate_str); mode = &codec_factory.modes[codec_factory.mode_count++]; mode->enabled = PJ_TRUE; mode->pt = PJMEDIA_RTP_PT_G7221C_24; mode->sample_rate = UWB_SAMPLE_RATE; mode->bitrate = 24000; pj_utoa(mode->bitrate, mode->bitrate_str); mode = &codec_factory.modes[codec_factory.mode_count++]; mode->enabled = PJ_TRUE; mode->pt = PJMEDIA_RTP_PT_G7221C_32; mode->sample_rate = UWB_SAMPLE_RATE; mode->bitrate = 32000; pj_utoa(mode->bitrate, mode->bitrate_str); mode = &codec_factory.modes[codec_factory.mode_count++]; mode->enabled = PJ_TRUE; mode->pt = PJMEDIA_RTP_PT_G7221C_48; mode->sample_rate = UWB_SAMPLE_RATE; mode->bitrate = 48000; pj_utoa(mode->bitrate, mode->bitrate_str); /* Non-standard bitrates */ /* Bitrate 16kbps is non-standard but rather commonly used. */ mode = &codec_factory.modes[codec_factory.mode_count++]; mode->enabled = PJ_FALSE; mode->pt = PJMEDIA_RTP_PT_G722_1_16; mode->sample_rate = WB_SAMPLE_RATE; mode->bitrate = 16000; pj_utoa(mode->bitrate, mode->bitrate_str); /* Reserved two modes for non-standard bitrates */ codec_factory.mode_rsv_start = codec_factory.mode_count; mode = &codec_factory.modes[codec_factory.mode_count++]; mode->enabled = PJ_FALSE; mode->pt = PJMEDIA_RTP_PT_G7221_RSV1; mode = &codec_factory.modes[codec_factory.mode_count++]; mode->enabled = PJ_FALSE; mode->pt = PJMEDIA_RTP_PT_G7221_RSV2; pj_assert(codec_factory.mode_count <= MAX_CODEC_MODES); /* Create G722.1 codec factory. */ codec_factory.base.op = &codec_factory_op; codec_factory.base.factory_data = NULL; codec_factory.endpt = endpt; codec_factory.pool = pjmedia_endpt_create_pool(endpt, "G722.1 codec", 4000, 4000); if (!codec_factory.pool) return PJ_ENOMEM; /* Create mutex. */ status = pj_mutex_create_simple(codec_factory.pool, "G722.1 codec", &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, &codec_factory.base); if (status != PJ_SUCCESS) goto on_error; /* Done. */ return PJ_SUCCESS; on_error: if (codec_factory.mutex) { pj_mutex_destroy(codec_factory.mutex); codec_factory.mutex = NULL; } pj_pool_release(codec_factory.pool); codec_factory.pool = NULL; return status; } /** * Enable and disable G722.1 modes, including non-standard modes. */ PJ_DEF(pj_status_t) pjmedia_codec_g7221_set_mode(unsigned sample_rate, unsigned bitrate, pj_bool_t enabled) { unsigned i; /* Validate mode */ if (!validate_mode(sample_rate, bitrate)) return PJMEDIA_CODEC_EINMODE; /* Look up in factory modes table */ for (i = 0; i < codec_factory.mode_count; ++i) { if (codec_factory.modes[i].sample_rate == sample_rate && codec_factory.modes[i].bitrate == bitrate) { codec_factory.modes[i].enabled = enabled; return PJ_SUCCESS; } } /* Mode not found in modes table, this may be a request to enable * a non-standard G722.1 mode. */ /* Non-standard mode need to be initialized first before user * can disable it. */ if (!enabled) return PJ_ENOTFOUND; /* Initialize a non-standard mode, look for available space. */ for (i = codec_factory.mode_rsv_start; i < codec_factory.mode_count; ++i) { if (!codec_factory.modes[i].enabled) { codec_mode *mode = &codec_factory.modes[i]; mode->enabled = PJ_TRUE; mode->sample_rate = sample_rate; mode->bitrate = bitrate; pj_utoa(mode->bitrate, mode->bitrate_str); return PJ_SUCCESS; } } /* No space for non-standard mode. */ return PJ_ETOOMANY; } /* * Unregister G722.1 codec factory from pjmedia endpoint. */ PJ_DEF(pj_status_t) pjmedia_codec_g7221_deinit(void) { pjmedia_codec_mgr *codec_mgr; pj_status_t status; if (codec_factory.pool == NULL) { /* Already deinitialized */ return PJ_SUCCESS; } pj_mutex_lock(codec_factory.mutex); /* Get the codec manager. */ codec_mgr = pjmedia_endpt_get_codec_mgr(codec_factory.endpt); if (!codec_mgr) { pj_pool_release(codec_factory.pool); codec_factory.pool = NULL; return PJ_EINVALIDOP; } /* Unregister G722.1 codec factory. */ status = pjmedia_codec_mgr_unregister_factory(codec_mgr, &codec_factory.base); /* Destroy mutex. */ pj_mutex_destroy(codec_factory.mutex); /* Destroy pool. */ pj_pool_release(codec_factory.pool); codec_factory.pool = NULL; return status; } /* * Check if factory can allocate the specified codec. */ static pj_status_t test_alloc( pjmedia_codec_factory *factory, const pjmedia_codec_info *info ) { PJ_UNUSED_ARG(factory); /* Type MUST be audio. */ if (info->type != PJMEDIA_TYPE_AUDIO) return PJMEDIA_CODEC_EUNSUP; /* Check encoding name. */ if (pj_stricmp2(&info->encoding_name, CODEC_TAG) != 0) return PJMEDIA_CODEC_EUNSUP; /* Check clock-rate */ if (info->clock_rate != WB_SAMPLE_RATE && info->clock_rate != UWB_SAMPLE_RATE) { return PJMEDIA_CODEC_EUNSUP; } return PJ_SUCCESS; } /* * Generate default attribute. */ static pj_status_t default_attr ( pjmedia_codec_factory *factory, const pjmedia_codec_info *id, pjmedia_codec_param *attr ) { codec_mode *mode; PJ_ASSERT_RETURN(factory==&codec_factory.base, PJ_EINVAL); pj_bzero(attr, sizeof(pjmedia_codec_param)); mode = lookup_mode(id->pt); if (mode == NULL || !mode->enabled) return PJMEDIA_CODEC_EUNSUP; attr->info.pt = (pj_uint8_t)id->pt; attr->info.channel_cnt = 1; attr->info.clock_rate = mode->sample_rate; attr->info.max_bps = mode->bitrate; attr->info.avg_bps = mode->bitrate; attr->info.pcm_bits_per_sample = 16; attr->info.frm_ptime = 20; /* Default flags. */ attr->setting.plc = 1; attr->setting.vad = 0; attr->setting.frm_per_pkt = 1; /* Default FMTP setting */ attr->setting.dec_fmtp.cnt = 1; attr->setting.dec_fmtp.param[0].name = pj_str("bitrate"); attr->setting.dec_fmtp.param[0].val = pj_str(mode->bitrate_str); return PJ_SUCCESS; } /* * Enum codecs supported by this factory. */ static pj_status_t enum_codecs( pjmedia_codec_factory *factory, unsigned *count, pjmedia_codec_info codecs[]) { unsigned i, max_cnt; PJ_ASSERT_RETURN(factory==&codec_factory.base, PJ_EINVAL); PJ_ASSERT_RETURN(codecs && *count > 0, PJ_EINVAL); max_cnt = *count; *count = 0; for (i=0; (i < codec_factory.mode_count) && (*count < max_cnt); ++i) { if (!codec_factory.modes[i].enabled) continue; pj_bzero(&codecs[*count], sizeof(pjmedia_codec_info)); codecs[*count].encoding_name = pj_str((char*)CODEC_TAG); codecs[*count].pt = codec_factory.modes[i].pt; codecs[*count].type = PJMEDIA_TYPE_AUDIO; codecs[*count].clock_rate = codec_factory.modes[i].sample_rate; codecs[*count].channel_cnt = 1; ++ *count; } return PJ_SUCCESS; } /* * Allocate a new codec instance. */ static pj_status_t alloc_codec( pjmedia_codec_factory *factory, const pjmedia_codec_info *id, pjmedia_codec **p_codec) { codec_private_t *codec_data; pjmedia_codec *codec; pj_pool_t *pool; pj_status_t status; PJ_ASSERT_RETURN(factory && id && p_codec, PJ_EINVAL); PJ_ASSERT_RETURN(factory == &codec_factory.base, PJ_EINVAL); pj_mutex_lock(codec_factory.mutex); /* Create pool for codec instance */ pool = pjmedia_endpt_create_pool(codec_factory.endpt, "G7221", 512, 512); codec = PJ_POOL_ZALLOC_T(pool, pjmedia_codec); codec->op = &codec_op; codec->factory = factory; codec->codec_data = PJ_POOL_ZALLOC_T(pool, codec_private_t); codec_data = (codec_private_t*) codec->codec_data; codec_data->pool = pool; /* Create silence detector */ status = pjmedia_silence_det_create(pool, id->clock_rate, id->clock_rate * 20 / 1000, &codec_data->vad); if (status != PJ_SUCCESS) { pj_mutex_unlock(codec_factory.mutex); return status; } pj_mutex_unlock(codec_factory.mutex); *p_codec = codec; return PJ_SUCCESS; } /* * Free codec. */ static pj_status_t dealloc_codec( pjmedia_codec_factory *factory, pjmedia_codec *codec ) { codec_private_t *codec_data; pj_pool_t *pool; PJ_ASSERT_RETURN(factory && codec, PJ_EINVAL); PJ_ASSERT_RETURN(factory == &codec_factory.base, PJ_EINVAL); /* Close codec, if it's not closed. */ codec_data = (codec_private_t*) codec->codec_data; pool = codec_data->pool; codec_close(codec); /* Release codec pool */ pj_pool_release(pool); return PJ_SUCCESS; } /* * Init codec. */ static pj_status_t 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 codec_open( pjmedia_codec *codec, pjmedia_codec_param *attr ) { codec_private_t *codec_data = (codec_private_t*) codec->codec_data; pj_pool_t *pool; unsigned tmp; /* Validation mode first! */ if (!validate_mode(attr->info.clock_rate, attr->info.avg_bps)) return PJMEDIA_CODEC_EINMODE; pool = codec_data->pool; /* Initialize common state */ codec_data->vad_enabled = (attr->setting.vad != 0); codec_data->plc_enabled = (attr->setting.plc != 0); codec_data->bitrate = (pj_uint16_t)attr->info.avg_bps; codec_data->frame_size_bits = (pj_uint16_t)(attr->info.avg_bps*20/1000); codec_data->frame_size = (pj_uint16_t)(codec_data->frame_size_bits>>3); codec_data->samples_per_frame = (pj_uint16_t) (attr->info.clock_rate*20/1000); codec_data->number_of_regions = (pj_uint16_t) (attr->info.clock_rate <= WB_SAMPLE_RATE? NUMBER_OF_REGIONS:MAX_NUMBER_OF_REGIONS); /* Initialize encoder state */ tmp = codec_data->samples_per_frame << 1; codec_data->enc_old_frame = (Word16*)pj_pool_zalloc(pool, tmp); /* Initialize decoder state */ tmp = codec_data->samples_per_frame; codec_data->dec_old_frame = (Word16*)pj_pool_zalloc(pool, tmp); tmp = codec_data->samples_per_frame << 1; codec_data->dec_old_mlt_coefs = (Word16*)pj_pool_zalloc(pool, tmp); codec_data->dec_randobj.seed0 = 1; codec_data->dec_randobj.seed1 = 1; codec_data->dec_randobj.seed2 = 1; codec_data->dec_randobj.seed3 = 1; return PJ_SUCCESS; } /* * Close codec. */ static pj_status_t codec_close( pjmedia_codec *codec ) { PJ_UNUSED_ARG(codec); return PJ_SUCCESS; } /* * Modify codec settings. */ static pj_status_t codec_modify( pjmedia_codec *codec, const pjmedia_codec_param *attr ) { codec_private_t *codec_data = (codec_private_t*) codec->codec_data; codec_data->vad_enabled = (attr->setting.vad != 0); codec_data->plc_enabled = (attr->setting.plc != 0); return PJ_SUCCESS; } /* * Get frames in the packet. */ static pj_status_t codec_parse( pjmedia_codec *codec, void *pkt, pj_size_t pkt_size, const pj_timestamp *ts, unsigned *frame_cnt, pjmedia_frame frames[]) { codec_private_t *codec_data = (codec_private_t*) codec->codec_data; unsigned count = 0; PJ_ASSERT_RETURN(frame_cnt, PJ_EINVAL); /* Parse based on fixed frame size. */ while (pkt_size >= codec_data->frame_size && count < *frame_cnt) { frames[count].type = PJMEDIA_FRAME_TYPE_AUDIO; frames[count].buf = pkt; frames[count].size = codec_data->frame_size; frames[count].timestamp.u64 = ts->u64 + count * codec_data->samples_per_frame; pkt = (pj_uint8_t*)pkt + codec_data->frame_size; pkt_size -= codec_data->frame_size; ++count; } pj_assert(pkt_size == 0); *frame_cnt = count; return PJ_SUCCESS; } /* * Encode frames. */ static pj_status_t codec_encode( pjmedia_codec *codec, const struct pjmedia_frame *input, unsigned output_buf_len, struct pjmedia_frame *output) { codec_private_t *codec_data = (codec_private_t*) codec->codec_data; Word16 mlt_coefs[MAX_SAMPLES_PER_FRAME]; Word16 mag_shift; /* Check frame in & out size */ PJ_ASSERT_RETURN((pj_uint16_t)input->size == (codec_data->samples_per_frame<<1), PJMEDIA_CODEC_EPCMTOOSHORT); PJ_ASSERT_RETURN(output_buf_len >= codec_data->frame_size, PJMEDIA_CODEC_EFRMTOOSHORT); /* Apply silence detection if VAD is enabled */ if (codec_data->vad_enabled) { pj_bool_t is_silence; pj_int32_t silence_duration; pj_assert(codec_data->vad); silence_duration = pj_timestamp_diff32(&codec_data->last_tx, &input->timestamp); is_silence = pjmedia_silence_det_detect(codec_data->vad, (const pj_int16_t*) input->buf, (input->size >> 1), NULL); if (is_silence && PJMEDIA_CODEC_MAX_SILENCE_PERIOD != -1 && silence_duration < (PJMEDIA_CODEC_MAX_SILENCE_PERIOD * (int)codec_data->samples_per_frame / 20)) { output->type = PJMEDIA_FRAME_TYPE_NONE; output->buf = NULL; output->size = 0; output->timestamp = input->timestamp; return PJ_SUCCESS; } else { codec_data->last_tx = input->timestamp; } } /* Convert input samples to rmlt coefs */ mag_shift = samples_to_rmlt_coefs((Word16*)input->buf, codec_data->enc_old_frame, mlt_coefs, codec_data->samples_per_frame); /* Encode the mlt coefs. Note that encoder output stream is 16 bit array, * so we need to take care about endianness. */ encoder(codec_data->frame_size_bits, codec_data->number_of_regions, mlt_coefs, mag_shift, output->buf); #if defined(PJ_IS_LITTLE_ENDIAN) && PJ_IS_LITTLE_ENDIAN!=0 { pj_uint16_t *p, *p_end; p = (pj_uint16_t*)output->buf; p_end = p + codec_data->frame_size/2; while (p < p_end) { *p = pj_htons(*p); ++p; } } #endif output->type = PJMEDIA_FRAME_TYPE_AUDIO; output->size = codec_data->frame_size; return PJ_SUCCESS; } /* * Decode frame. */ static pj_status_t codec_decode( pjmedia_codec *codec, const struct pjmedia_frame *input, unsigned output_buf_len, struct pjmedia_frame *output) { codec_private_t *codec_data = (codec_private_t*) codec->codec_data; Word16 mlt_coefs[MAX_SAMPLES_PER_FRAME]; Word16 mag_shift; Bit_Obj bitobj; Word16 frame_error_flag = 0; /* Check frame out length size */ PJ_ASSERT_RETURN(output_buf_len >= (unsigned)(codec_data->samples_per_frame<<1), PJMEDIA_CODEC_EPCMTOOSHORT); /* If input is NULL, perform PLC by settting frame_error_flag to 1 */ if (input) { /* Check frame in length size */ PJ_ASSERT_RETURN((pj_uint16_t)input->size == codec_data->frame_size, PJMEDIA_CODEC_EFRMINLEN); /* Decoder requires input of 16-bits array, so we need to take care * about endianness. */ #if defined(PJ_IS_LITTLE_ENDIAN) && PJ_IS_LITTLE_ENDIAN!=0 { pj_uint16_t *p, *p_end; p = (pj_uint16_t*)input->buf; p_end = p + codec_data->frame_size/2; while (p < p_end) { *p = pj_ntohs(*p); ++p; } } #endif bitobj.code_word_ptr = (Word16*)input->buf; bitobj.current_word = *bitobj.code_word_ptr; bitobj.code_bit_count = 0; bitobj.number_of_bits_left = codec_data->frame_size_bits; } else { pj_bzero(&bitobj, sizeof(bitobj)); frame_error_flag = 1; } /* Process the input frame to get mlt coefs */ decoder(&bitobj, &codec_data->dec_randobj, codec_data->number_of_regions, mlt_coefs, &mag_shift, &codec_data->dec_old_mag_shift, codec_data->dec_old_mlt_coefs, frame_error_flag); /* Convert the mlt_coefs to PCM samples */ rmlt_coefs_to_samples(mlt_coefs, codec_data->dec_old_frame, (Word16*)output->buf, codec_data->samples_per_frame, mag_shift); output->type = PJMEDIA_FRAME_TYPE_AUDIO; output->size = codec_data->samples_per_frame << 1; return PJ_SUCCESS; } /* * Recover lost frame. */ static pj_status_t codec_recover( pjmedia_codec *codec, unsigned output_buf_len, struct pjmedia_frame *output) { codec_private_t *codec_data = (codec_private_t*) codec->codec_data; /* Use native PLC when PLC is enabled. */ if (codec_data->plc_enabled) return codec_decode(codec, NULL, output_buf_len, output); /* Otherwise just return zero-fill frame. */ output->type = PJMEDIA_FRAME_TYPE_AUDIO; output->size = codec_data->samples_per_frame << 1; pjmedia_zero_samples((pj_int16_t*)output->buf, codec_data->samples_per_frame); return PJ_SUCCESS; } #endif /* PJMEDIA_HAS_G7221_CODEC */