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/* $Id: mem_capture.c 3664 2011-07-19 03:42:28Z nanang $ */
/*
* 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/mem_port.h>
#include <pj/assert.h>
#include <pj/errno.h>
#include <pj/pool.h>
#define THIS_FILE "mem_capture.c"
#define SIGNATURE PJMEDIA_SIG_PORT_MEM_CAPTURE
#define BYTES_PER_SAMPLE 2
struct mem_rec
{
pjmedia_port base;
unsigned options;
char *buffer;
pj_size_t buf_size;
char *write_pos;
pj_bool_t eof;
void *user_data;
pj_status_t (*cb)(pjmedia_port *port,
void *user_data);
};
static pj_status_t rec_put_frame(pjmedia_port *this_port,
pjmedia_frame *frame);
static pj_status_t rec_get_frame(pjmedia_port *this_port,
pjmedia_frame *frame);
static pj_status_t rec_on_destroy(pjmedia_port *this_port);
PJ_DEF(pj_status_t) pjmedia_mem_capture_create( pj_pool_t *pool,
void *buffer,
pj_size_t size,
unsigned clock_rate,
unsigned channel_count,
unsigned samples_per_frame,
unsigned bits_per_sample,
unsigned options,
pjmedia_port **p_port)
{
struct mem_rec *rec;
const pj_str_t name = { "memrec", 6 };
/* Sanity check */
PJ_ASSERT_RETURN(pool && buffer && size && clock_rate && channel_count &&
samples_per_frame && bits_per_sample && p_port,
PJ_EINVAL);
/* Can only support 16bit PCM */
PJ_ASSERT_RETURN(bits_per_sample == 16, PJ_EINVAL);
rec = PJ_POOL_ZALLOC_T(pool, struct mem_rec);
PJ_ASSERT_RETURN(rec != NULL, PJ_ENOMEM);
/* Create the rec */
pjmedia_port_info_init(&rec->base.info, &name, SIGNATURE,
clock_rate, channel_count, bits_per_sample,
samples_per_frame);
rec->base.put_frame = &rec_put_frame;
rec->base.get_frame = &rec_get_frame;
rec->base.on_destroy = &rec_on_destroy;
/* Save the buffer */
rec->buffer = rec->write_pos = (char*)buffer;
rec->buf_size = size;
/* Options */
rec->options = options;
*p_port = &rec->base;
return PJ_SUCCESS;
}
/*
* Register a callback to be called when the file reading has reached the
* end of buffer.
*/
PJ_DEF(pj_status_t) pjmedia_mem_capture_set_eof_cb( pjmedia_port *port,
void *user_data,
pj_status_t (*cb)(pjmedia_port *port,
void *usr_data))
{
struct mem_rec *rec;
PJ_ASSERT_RETURN(port->info.signature == SIGNATURE,
PJ_EINVALIDOP);
rec = (struct mem_rec*) port;
rec->user_data = user_data;
rec->cb = cb;
return PJ_SUCCESS;
}
/* Get current buffer size */
PJ_DEF(pj_size_t) pjmedia_mem_capture_get_size(pjmedia_port *port)
{
struct mem_rec *rec;
PJ_ASSERT_RETURN(port->info.signature == SIGNATURE,
0);
rec = (struct mem_rec*) port;
if (rec->eof){
return rec->buf_size;
}
return rec->write_pos - rec->buffer;
}
static pj_status_t rec_put_frame( pjmedia_port *this_port,
pjmedia_frame *frame)
{
struct mem_rec *rec;
char *endpos;
pj_size_t size_written;
PJ_ASSERT_RETURN(this_port->info.signature == SIGNATURE,
PJ_EINVALIDOP);
rec = (struct mem_rec*) this_port;
if (rec->eof) {
return PJ_EEOF;
}
size_written = 0;
endpos = rec->buffer + rec->buf_size;
while (size_written < frame->size) {
pj_size_t max;
max = frame->size - size_written;
if ((endpos - rec->write_pos) < (int)max)
max = endpos - rec->write_pos;
pj_memcpy(rec->write_pos, ((char*)frame->buf)+size_written, max);
size_written += max;
rec->write_pos += max;
pj_assert(rec->write_pos <= endpos);
if (rec->write_pos == endpos) {
/* Rewind */
rec->write_pos = rec->buffer;
/* Call callback, if any */
if (rec->cb) {
pj_status_t status;
rec->eof = PJ_TRUE;
status = (*rec->cb)(this_port, rec->user_data);
if (status != PJ_SUCCESS) {
/* Must not access recorder from here on. It may be
* destroyed by application.
*/
return status;
}
rec->eof = PJ_FALSE;
}
}
}
return PJ_SUCCESS;
}
static pj_status_t rec_get_frame( pjmedia_port *this_port,
pjmedia_frame *frame)
{
PJ_ASSERT_RETURN(this_port->info.signature == SIGNATURE,
PJ_EINVALIDOP);
PJ_UNUSED_ARG(this_port);
frame->size = 0;
frame->type = PJMEDIA_FRAME_TYPE_NONE;
return PJ_SUCCESS;
}
static pj_status_t rec_on_destroy(pjmedia_port *this_port)
{
/* Call callback if data was captured
* and we're not in the callback already.
*/
struct mem_rec *rec;
PJ_ASSERT_RETURN(this_port->info.signature == SIGNATURE,
PJ_EINVALIDOP);
rec = (struct mem_rec*) this_port;
if(rec->cb && PJ_FALSE == rec->eof) {
rec->eof = PJ_TRUE;
(*rec->cb)(this_port, rec->user_data);
}
return PJ_SUCCESS;
}
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