【VC开源代码栏目提醒】:网学会员在VC开源代码频道为大家收集整理了celp_file.cpp提供大家参考,希望对大家有所帮助!
/*
* The contents of this file are subject to the Mozilla Public
* License Version 1.1 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is MPEG4IP.
*
* The Initial Developer of the Original Code is Cisco Systems Inc.
* Portions created by Cisco Systems Inc. are
* Copyright (C) Cisco Systems Inc. 2000, 2001. All Rights Reserved.
*
* Contributor(s):
* Massimo Villari
celp_file.cpp为[网学网-网友上传,谢谢支持]。
*/
/*
* celp_file.cpp - create media structure for celp files
*/
#include "celp.h"
codec_data_t *celp_file_check (lib_message_func_t message,
const char *name,
double *max,
char *desc[4])
{
celp_codec_t *celp;
int len = strlen(name);
if (strcasecmp(name + len - 5, ".celp") != 0) {
return (NULL);
}
celp = MALLOC_STRUCTURE(celp_codec_t);
memset(celp, 0, sizeof(*celp));
*max = 0;
celp->m_buffer = (uint8_t *)malloc(MAX_READ_BUFFER);
celp->m_buffer_size_max = MAX_READ_BUFFER;
celp->m_ifile = fopen(name, FOPEN_READ_BINARY);
if (celp->m_ifile == NULL) {
free(celp);
return NULL;
}
//celp->m_output_frame_size = 1024;
celp->m_buffer_size = fread(celp->m_buffer,
1,
celp->m_buffer_size_max,
celp->m_ifile);
unsigned long freq, chans;
// may want to actually decode the first frame...
if (freq == 0) {
message(LOG_ERR, celplib, "Couldn't determine CELP frame rate");
celp_close((codec_data_t *)celp);
return (NULL);
}
celp->m_freq = freq;
celp->m_chans = chans;
celp->m_celp_inited = 1;
celp->m_framecount = 0;
return ((codec_data_t *)celp);
}
int celp_file_next_frame (codec_data_t *your,
uint8_t **buffer,
uint64_t *ts)
{
celp_codec_t *celp = (celp_codec_t *)your;
if (celp->m_buffer_on > 0) {
memmove(celp->m_buffer,
&celp->m_buffer[celp->m_buffer_on],
celp->m_buffer_size - celp->m_buffer_on);
}
celp->m_buffer_size -= celp->m_buffer_on;
celp->m_buffer_size += fread(celp->m_buffer + celp->m_buffer_size,
1,
celp->m_buffer_size_max - celp->m_buffer_size,
celp->m_ifile);
celp->m_buffer_on = 0;
if (celp->m_buffer_size == 0) return 0;
uint64_t calc;
calc = celp->m_framecount * 1024 * M_LLU;
calc /= celp->m_freq;
*ts = calc;
*buffer = celp->m_buffer;
celp->m_framecount++;
return (celp->m_buffer_size);
}
void celp_file_used_for_frame (codec_data_t *ifptr,
uint32_t bytes)
{
celp_codec_t *celp = (celp_codec_t *)ifptr;
celp->m_buffer_on += bytes;
if (celp->m_buffer_on > celp->m_buffer_size) celp->m_buffer_on = celp->m_buffer_size;
}
int celp_file_eof (codec_data_t *ifptr)
{
celp_codec_t *celp = (celp_codec_t *)ifptr;
return celp->m_buffer_on == celp->m_buffer_size && feof(celp->m_ifile);
}
int celp_raw_file_seek_to (codec_data_t *ifptr, uint64_t ts)
{
if (ts != 0) return -1;
celp_codec_t *celp = (celp_codec_t *)ifptr;
rewind(celp->m_ifile);
celp->m_buffer_size = celp->m_buffer_on = 0;
celp->m_framecount = 0;
return 0;
}
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