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/* $Id: mem_player.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_player.c"
#define SIGNATURE PJMEDIA_SIG_PORT_MEM_PLAYER
#define BYTES_PER_SAMPLE 2
struct mem_player
{
pjmedia_port base;
unsigned options;
pj_timestamp timestamp;
char *buffer;
pj_size_t buf_size;
char *read_pos;
pj_bool_t eof;
void *user_data;
pj_status_t (*cb)(pjmedia_port *port,
void *user_data);
};
static pj_status_t mem_put_frame(pjmedia_port *this_port,
pjmedia_frame *frame);
static pj_status_t mem_get_frame(pjmedia_port *this_port,
pjmedia_frame *frame);
static pj_status_t mem_on_destroy(pjmedia_port *this_port);
PJ_DEF(pj_status_t) pjmedia_mem_player_create( pj_pool_t *pool,
const 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_player *port;
pj_str_t name = pj_str("memplayer");
/* 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);
port = PJ_POOL_ZALLOC_T(pool, struct mem_player);
PJ_ASSERT_RETURN(port != NULL, PJ_ENOMEM);
/* Create the port */
pjmedia_port_info_init(&port->base.info, &name, SIGNATURE, clock_rate,
channel_count, bits_per_sample, samples_per_frame);
port->base.put_frame = &mem_put_frame;
port->base.get_frame = &mem_get_frame;
port->base.on_destroy = &mem_on_destroy;
/* Save the buffer */
port->buffer = port->read_pos = (char*)buffer;
port->buf_size = size;
/* Options */
port->options = options;
*p_port = &port->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_player_set_eof_cb( pjmedia_port *port,
void *user_data,
pj_status_t (*cb)(pjmedia_port *port,
void *usr_data))
{
struct mem_player *player;
PJ_ASSERT_RETURN(port->info.signature == SIGNATURE,
PJ_EINVALIDOP);
player = (struct mem_player*) port;
player->user_data = user_data;
player->cb = cb;
return PJ_SUCCESS;
}
static pj_status_t mem_put_frame( pjmedia_port *this_port,
pjmedia_frame *frame)
{
PJ_UNUSED_ARG(this_port);
PJ_UNUSED_ARG(frame);
return PJ_SUCCESS;
}
static pj_status_t mem_get_frame( pjmedia_port *this_port,
pjmedia_frame *frame)
{
struct mem_player *player;
char *endpos;
pj_size_t size_needed, size_written;
PJ_ASSERT_RETURN(this_port->info.signature == SIGNATURE,
PJ_EINVALIDOP);
player = (struct mem_player*) this_port;
if (player->eof) {
pj_status_t status = PJ_SUCCESS;
/* Call callback, if any */
if (player->cb)
status = (*player->cb)(this_port, player->user_data);
/* If callback returns non PJ_SUCCESS or 'no loop' is specified
* return immediately (and don't try to access player port since
* it might have been destroyed by the callback).
*/
if ((status != PJ_SUCCESS) || (player->options & PJMEDIA_MEM_NO_LOOP)) {
frame->type = PJMEDIA_FRAME_TYPE_NONE;
return PJ_EEOF;
}
player->eof = PJ_FALSE;
}
size_needed = PJMEDIA_PIA_AVG_FSZ(&this_port->info);
size_written = 0;
endpos = player->buffer + player->buf_size;
while (size_written < size_needed) {
char *dst = ((char*)frame->buf) + size_written;
pj_size_t max;
max = size_needed - size_written;
if (endpos - player->read_pos < (int)max)
max = endpos - player->read_pos;
pj_memcpy(dst, player->read_pos, max);
size_written += max;
player->read_pos += max;
pj_assert(player->read_pos <= endpos);
if (player->read_pos == endpos) {
/* Set EOF flag */
player->eof = PJ_TRUE;
/* Reset read pointer */
player->read_pos = player->buffer;
/* Pad with zeroes then return for no looped play */
if (player->options & PJMEDIA_MEM_NO_LOOP) {
pj_size_t null_len;
null_len = size_needed - size_written;
pj_bzero(dst + max, null_len);
break;
}
}
}
frame->size = PJMEDIA_PIA_AVG_FSZ(&this_port->info);
frame->timestamp.u64 = player->timestamp.u64;
frame->type = PJMEDIA_FRAME_TYPE_AUDIO;
player->timestamp.u64 += PJMEDIA_PIA_SPF(&this_port->info);
return PJ_SUCCESS;
}
static pj_status_t mem_on_destroy(pjmedia_port *this_port)
{
PJ_ASSERT_RETURN(this_port->info.signature == SIGNATURE,
PJ_EINVALIDOP);
/* Destroy signature */
this_port->info.signature = 0;
return PJ_SUCCESS;
}
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