212 lines
5.2 KiB
C
212 lines
5.2 KiB
C
/* $Id$ */
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/*
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* Copyright (C) 2003-2007 Benny Prijono <benny@prijono.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <pjmedia/mem_port.h>
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#include <pj/assert.h>
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#include <pj/errno.h>
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#include <pj/pool.h>
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#define THIS_FILE "mem_player.c"
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#define SIGNATURE PJMEDIA_PORT_SIGNATURE('M', 'P', 'l', 'y')
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#define BYTES_PER_SAMPLE 2
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struct mem_player
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{
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pjmedia_port base;
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unsigned options;
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pj_timestamp timestamp;
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char *buffer;
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pj_size_t buf_size;
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char *read_pos;
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pj_bool_t eof;
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void *user_data;
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pj_status_t (*cb)(pjmedia_port *port,
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void *user_data);
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};
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static pj_status_t mem_put_frame(pjmedia_port *this_port,
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const pjmedia_frame *frame);
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static pj_status_t mem_get_frame(pjmedia_port *this_port,
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pjmedia_frame *frame);
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static pj_status_t mem_on_destroy(pjmedia_port *this_port);
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PJ_DEF(pj_status_t) pjmedia_mem_player_create( pj_pool_t *pool,
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const void *buffer,
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pj_size_t size,
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unsigned clock_rate,
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unsigned channel_count,
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unsigned samples_per_frame,
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unsigned bits_per_sample,
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unsigned options,
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pjmedia_port **p_port )
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{
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struct mem_player *port;
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pj_str_t name = pj_str("memplayer");
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/* Sanity check */
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PJ_ASSERT_RETURN(pool && buffer && size && clock_rate && channel_count &&
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samples_per_frame && bits_per_sample && p_port,
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PJ_EINVAL);
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/* Can only support 16bit PCM */
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PJ_ASSERT_RETURN(bits_per_sample == 16, PJ_EINVAL);
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port = PJ_POOL_ZALLOC_T(pool, struct mem_player);
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PJ_ASSERT_RETURN(port != NULL, PJ_ENOMEM);
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/* Create the port */
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pjmedia_port_info_init(&port->base.info, &name, SIGNATURE, clock_rate,
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channel_count, bits_per_sample, samples_per_frame);
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port->base.put_frame = &mem_put_frame;
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port->base.get_frame = &mem_get_frame;
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port->base.on_destroy = &mem_on_destroy;
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/* Save the buffer */
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port->buffer = port->read_pos = (char*)buffer;
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port->buf_size = size;
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/* Options */
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port->options = options;
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*p_port = &port->base;
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return PJ_SUCCESS;
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}
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/*
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* Register a callback to be called when the file reading has reached the
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* end of buffer.
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*/
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PJ_DEF(pj_status_t) pjmedia_mem_player_set_eof_cb( pjmedia_port *port,
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void *user_data,
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pj_status_t (*cb)(pjmedia_port *port,
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void *usr_data))
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{
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struct mem_player *player;
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PJ_ASSERT_RETURN(port->info.signature == SIGNATURE,
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PJ_EINVALIDOP);
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player = (struct mem_player*) port;
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player->user_data = user_data;
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player->cb = cb;
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return PJ_SUCCESS;
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}
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static pj_status_t mem_put_frame( pjmedia_port *this_port,
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const pjmedia_frame *frame)
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{
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PJ_UNUSED_ARG(this_port);
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PJ_UNUSED_ARG(frame);
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return PJ_SUCCESS;
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}
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static pj_status_t mem_get_frame( pjmedia_port *this_port,
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pjmedia_frame *frame)
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{
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struct mem_player *player;
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char *endpos;
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pj_size_t size_needed, size_written;
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PJ_ASSERT_RETURN(this_port->info.signature == SIGNATURE,
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PJ_EINVALIDOP);
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player = (struct mem_player*) this_port;
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if (player->eof) {
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frame->type = PJMEDIA_FRAME_TYPE_NONE;
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return PJ_EEOF;
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}
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size_needed = this_port->info.bytes_per_frame;
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size_written = 0;
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endpos = player->buffer + player->buf_size;
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while (size_written < size_needed) {
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char *dst = ((char*)frame->buf) + size_written;
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pj_size_t max;
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max = size_needed - size_written;
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if (endpos - player->read_pos < (int)max)
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max = endpos - player->read_pos;
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pj_memcpy(dst, player->read_pos, max);
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size_written += max;
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player->read_pos += max;
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pj_assert(player->read_pos <= endpos);
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if (player->read_pos == endpos) {
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player->read_pos = player->buffer;
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/* Call callback, if any */
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if (player->cb) {
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pj_status_t status;
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player->eof = PJ_TRUE;
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status = (*player->cb)(this_port, player->user_data);
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if (status != PJ_SUCCESS) {
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/* Must not access player from here on. It may be
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* destroyed by application.
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*/
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frame->size = size_written;
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frame->timestamp.u64 = player->timestamp.u64;
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frame->type = PJMEDIA_FRAME_TYPE_AUDIO;
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return status;
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}
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player->eof = PJ_FALSE;
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}
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}
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}
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frame->size = this_port->info.bytes_per_frame;
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frame->timestamp.u64 = player->timestamp.u64;
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frame->type = PJMEDIA_FRAME_TYPE_AUDIO;
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player->timestamp.u64 += this_port->info.samples_per_frame;
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return PJ_SUCCESS;
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}
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static pj_status_t mem_on_destroy(pjmedia_port *this_port)
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{
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/* Nothing to do */
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PJ_UNUSED_ARG(this_port);
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return PJ_SUCCESS;
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}
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