mirror of
https://gitlab.freedesktop.org/pulseaudio/pulseaudio.git
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133 lines
3.3 KiB
C
133 lines
3.3 KiB
C
/***
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This file is part of PulseAudio.
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Copyright 2013 Matthias Wabersich
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Copyright 2013 Hajime Fujita
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PulseAudio is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published
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by the Free Software Foundation; either version 2.1 of the License,
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or (at your option) any later version.
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PulseAudio is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with PulseAudio; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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USA.
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***/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <stdlib.h>
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#include <limits.h>
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#include <pulse/xmalloc.h>
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#include <pulsecore/core-error.h>
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#include <pulsecore/macro.h>
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#include "raop-packet-buffer.h"
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struct pa_raop_packet_buffer {
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pa_memchunk *packets;
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pa_mempool *mempool;
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size_t size;
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uint16_t seq;
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size_t pos;
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};
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pa_raop_packet_buffer *pa_raop_packet_buffer_new(pa_mempool *mempool, const size_t size) {
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pa_raop_packet_buffer *pb = pa_xnew0(pa_raop_packet_buffer, 1);
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pa_assert(mempool);
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pa_assert(size > 0);
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pb->size = size;
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pb->mempool = mempool;
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pb->packets = pa_xnew0(pa_memchunk, size);
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pb->seq = pb->pos = 0;
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return pb;
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}
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void pa_raop_packet_buffer_free(pa_raop_packet_buffer *pb) {
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size_t i;
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pa_assert(pb);
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for (i = 0; pb->packets && i < pb->size; i++) {
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if (pb->packets[i].memblock)
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pa_memblock_unref(pb->packets[i].memblock);
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pa_memchunk_reset(&pb->packets[i]);
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}
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pa_xfree(pb->packets);
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pb->packets = NULL;
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pa_xfree(pb);
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}
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void pa_raop_packet_buffer_reset(pa_raop_packet_buffer *pb, uint16_t seq) {
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size_t i;
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pa_assert(pb);
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pa_assert(pb->packets);
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pb->pos = 0;
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pb->seq = seq - 1;
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for (i = 0; i < pb->size; i++) {
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if (pb->packets[i].memblock)
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pa_memblock_unref(pb->packets[i].memblock);
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pa_memchunk_reset(&pb->packets[i]);
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}
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}
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uint16_t pa_raop_packet_buffer_wrap_seq(pa_raop_packet_buffer *pb, uint16_t seq) {
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int seq_shift;
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pa_assert(pb);
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if (seq > pb->seq)
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seq_shift = pb->seq - 1;
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else
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seq_shift = seq;
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pb->seq -= seq_shift;
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return seq - seq_shift;
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}
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pa_memchunk *pa_raop_packet_buffer_get(pa_raop_packet_buffer *pb, uint16_t seq, const size_t size) {
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pa_memchunk *packet = NULL;
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size_t delta, i;
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pa_assert(pb);
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pa_assert(pb->packets);
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if (seq == pb->seq)
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packet = &pb->packets[pb->pos];
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else if (seq < pb->seq) {
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delta = pb->seq - seq;
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i = (pb->size + pb->pos - delta) % pb->size;
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if (delta < pb->size)
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packet = &pb->packets[i];
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} else {
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i = (pb->pos + (seq - pb->seq)) % pb->size;
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if (pb->packets[i].memblock)
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pa_memblock_unref(pb->packets[i].memblock);
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pa_memchunk_reset(&pb->packets[i]);
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pb->packets[i].memblock = pa_memblock_new(pb->mempool, size);
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packet = &pb->packets[i];
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pb->seq = seq;
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pb->pos = i;
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}
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return packet;
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}
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