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🎥 Command line media player
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131/* * This file is part of mpv. * Copyright (c) 2012 wm4 * Copyright (c) 2013 Stefano Pigozzi <stefano.pigozzi@gmail.com> * * mpv is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * mpv 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 Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with mpv. If not, see <http://www.gnu.org/licenses/>. */
#include <inttypes.h>#include <libavutil/common.h>#include <assert.h>#include "mpv_talloc.h"#include "osdep/atomic.h"#include "ring.h"
struct mp_ring { uint8_t *buffer;
/* Positions of the first readable/writeable chunks. Do not read these * fields. Use the atomic private accessors `mp_ring_get_wpos` * and `mp_ring_get_rpos`. */ atomic_ullong rpos, wpos;};
static unsigned long long mp_ring_get_wpos(struct mp_ring *buffer){ return atomic_load(&buffer->wpos);}
static unsigned long long mp_ring_get_rpos(struct mp_ring *buffer){ return atomic_load(&buffer->rpos);}
struct mp_ring *mp_ring_new(void *talloc_ctx, int size){ struct mp_ring *ringbuffer = talloc_zero(talloc_ctx, struct mp_ring);
*ringbuffer = (struct mp_ring) { .buffer = talloc_size(talloc_ctx, size), };
return ringbuffer;}
int mp_ring_read(struct mp_ring *buffer, unsigned char *dest, int len){ int size = mp_ring_size(buffer); int buffered = mp_ring_buffered(buffer); int read_len = FFMIN(len, buffered); int read_ptr = mp_ring_get_rpos(buffer) % size;
int len1 = FFMIN(size - read_ptr, read_len); int len2 = read_len - len1;
if (dest) { memcpy(dest, buffer->buffer + read_ptr, len1); memcpy(dest + len1, buffer->buffer, len2); }
atomic_fetch_add(&buffer->rpos, read_len);
return read_len;}
int mp_ring_drain(struct mp_ring *buffer, int len){ return mp_ring_read(buffer, NULL, len);}
int mp_ring_write(struct mp_ring *buffer, unsigned char *src, int len){ int size = mp_ring_size(buffer); int free = mp_ring_available(buffer); int write_len = FFMIN(len, free); int write_ptr = mp_ring_get_wpos(buffer) % size;
int len1 = FFMIN(size - write_ptr, write_len); int len2 = write_len - len1;
memcpy(buffer->buffer + write_ptr, src, len1); memcpy(buffer->buffer, src + len1, len2);
atomic_fetch_add(&buffer->wpos, write_len);
return write_len;}
void mp_ring_reset(struct mp_ring *buffer){ atomic_store(&buffer->wpos, 0); atomic_store(&buffer->rpos, 0);}
int mp_ring_available(struct mp_ring *buffer){ return mp_ring_size(buffer) - mp_ring_buffered(buffer);}
int mp_ring_size(struct mp_ring *buffer){ return talloc_get_size(buffer->buffer);}
int mp_ring_buffered(struct mp_ring *buffer){ return (mp_ring_get_wpos(buffer) - mp_ring_get_rpos(buffer));}
char *mp_ring_repr(struct mp_ring *buffer, void *talloc_ctx){ return talloc_asprintf( talloc_ctx, "Ringbuffer { .size = %dB, .buffered = %dB, .available = %dB }", mp_ring_size(buffer), mp_ring_buffered(buffer), mp_ring_available(buffer));}