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![Marton Balint](/assets/img/avatar_default.png)
Fixes some random assertion failures with ffprobe -show_packets async:samples/ffmpeg-bugs/trac/ticket6132/Samsung_HDR_-_Chasing_the_Light.ts > /dev/null Signed-off-by: Marton Balint <cus@passwd.hu>
700 lines
19 KiB
C
700 lines
19 KiB
C
/*
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* Input async protocol.
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* Copyright (c) 2015 Zhang Rui <bbcallen@gmail.com>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Based on libavformat/cache.c by Michael Niedermayer
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*/
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/**
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* @TODO
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* support timeout
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* support work with concatdec, hls
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*/
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#include "libavutil/avassert.h"
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#include "libavutil/avstring.h"
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#include "libavutil/error.h"
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#include "libavutil/fifo.h"
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#include "libavutil/log.h"
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#include "libavutil/opt.h"
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#include "libavutil/thread.h"
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#include "url.h"
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#include <stdint.h>
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#if HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#define BUFFER_CAPACITY (4 * 1024 * 1024)
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#define READ_BACK_CAPACITY (4 * 1024 * 1024)
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#define SHORT_SEEK_THRESHOLD (256 * 1024)
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typedef struct RingBuffer
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{
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AVFifoBuffer *fifo;
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int read_back_capacity;
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int read_pos;
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} RingBuffer;
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typedef struct Context {
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AVClass *class;
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URLContext *inner;
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int seek_request;
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int64_t seek_pos;
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int seek_whence;
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int seek_completed;
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int64_t seek_ret;
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int inner_io_error;
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int io_error;
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int io_eof_reached;
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int64_t logical_pos;
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int64_t logical_size;
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RingBuffer ring;
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pthread_cond_t cond_wakeup_main;
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pthread_cond_t cond_wakeup_background;
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pthread_mutex_t mutex;
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pthread_t async_buffer_thread;
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int abort_request;
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AVIOInterruptCB interrupt_callback;
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} Context;
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static int ring_init(RingBuffer *ring, unsigned int capacity, int read_back_capacity)
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{
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memset(ring, 0, sizeof(RingBuffer));
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ring->fifo = av_fifo_alloc(capacity + read_back_capacity);
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if (!ring->fifo)
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return AVERROR(ENOMEM);
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ring->read_back_capacity = read_back_capacity;
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return 0;
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}
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static void ring_destroy(RingBuffer *ring)
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{
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av_fifo_freep(&ring->fifo);
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}
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static void ring_reset(RingBuffer *ring)
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{
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av_fifo_reset(ring->fifo);
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ring->read_pos = 0;
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}
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static int ring_size(RingBuffer *ring)
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{
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return av_fifo_size(ring->fifo) - ring->read_pos;
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}
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static int ring_space(RingBuffer *ring)
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{
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return av_fifo_space(ring->fifo);
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}
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static int ring_generic_read(RingBuffer *ring, void *dest, int buf_size, void (*func)(void*, void*, int))
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{
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int ret;
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av_assert2(buf_size <= ring_size(ring));
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ret = av_fifo_generic_peek_at(ring->fifo, dest, ring->read_pos, buf_size, func);
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ring->read_pos += buf_size;
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if (ring->read_pos > ring->read_back_capacity) {
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av_fifo_drain(ring->fifo, ring->read_pos - ring->read_back_capacity);
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ring->read_pos = ring->read_back_capacity;
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}
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return ret;
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}
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static int ring_generic_write(RingBuffer *ring, void *src, int size, int (*func)(void*, void*, int))
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{
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av_assert2(size <= ring_space(ring));
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return av_fifo_generic_write(ring->fifo, src, size, func);
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}
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static int ring_size_of_read_back(RingBuffer *ring)
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{
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return ring->read_pos;
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}
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static int ring_drain(RingBuffer *ring, int offset)
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{
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av_assert2(offset >= -ring_size_of_read_back(ring));
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av_assert2(offset <= ring_size(ring));
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ring->read_pos += offset;
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return 0;
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}
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static int async_check_interrupt(void *arg)
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{
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URLContext *h = arg;
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Context *c = h->priv_data;
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if (c->abort_request)
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return 1;
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if (ff_check_interrupt(&c->interrupt_callback))
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c->abort_request = 1;
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return c->abort_request;
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}
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static int wrapped_url_read(void *src, void *dst, int size)
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{
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URLContext *h = src;
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Context *c = h->priv_data;
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int ret;
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ret = ffurl_read(c->inner, dst, size);
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c->inner_io_error = ret < 0 ? ret : 0;
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return ret;
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}
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static void *async_buffer_task(void *arg)
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{
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URLContext *h = arg;
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Context *c = h->priv_data;
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RingBuffer *ring = &c->ring;
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int ret = 0;
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int64_t seek_ret;
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while (1) {
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int fifo_space, to_copy;
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pthread_mutex_lock(&c->mutex);
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if (async_check_interrupt(h)) {
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c->io_eof_reached = 1;
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c->io_error = AVERROR_EXIT;
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pthread_cond_signal(&c->cond_wakeup_main);
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pthread_mutex_unlock(&c->mutex);
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break;
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}
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if (c->seek_request) {
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seek_ret = ffurl_seek(c->inner, c->seek_pos, c->seek_whence);
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if (seek_ret >= 0) {
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c->io_eof_reached = 0;
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c->io_error = 0;
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ring_reset(ring);
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}
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c->seek_completed = 1;
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c->seek_ret = seek_ret;
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c->seek_request = 0;
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pthread_cond_signal(&c->cond_wakeup_main);
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pthread_mutex_unlock(&c->mutex);
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continue;
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}
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fifo_space = ring_space(ring);
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if (c->io_eof_reached || fifo_space <= 0) {
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pthread_cond_signal(&c->cond_wakeup_main);
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pthread_cond_wait(&c->cond_wakeup_background, &c->mutex);
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pthread_mutex_unlock(&c->mutex);
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continue;
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}
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pthread_mutex_unlock(&c->mutex);
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to_copy = FFMIN(4096, fifo_space);
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ret = ring_generic_write(ring, (void *)h, to_copy, wrapped_url_read);
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pthread_mutex_lock(&c->mutex);
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if (ret <= 0) {
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c->io_eof_reached = 1;
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if (c->inner_io_error < 0)
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c->io_error = c->inner_io_error;
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}
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pthread_cond_signal(&c->cond_wakeup_main);
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pthread_mutex_unlock(&c->mutex);
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}
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return NULL;
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}
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static int async_open(URLContext *h, const char *arg, int flags, AVDictionary **options)
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{
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Context *c = h->priv_data;
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int ret;
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AVIOInterruptCB interrupt_callback = {.callback = async_check_interrupt, .opaque = h};
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av_strstart(arg, "async:", &arg);
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ret = ring_init(&c->ring, BUFFER_CAPACITY, READ_BACK_CAPACITY);
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if (ret < 0)
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goto fifo_fail;
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/* wrap interrupt callback */
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c->interrupt_callback = h->interrupt_callback;
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ret = ffurl_open_whitelist(&c->inner, arg, flags, &interrupt_callback, options, h->protocol_whitelist, h->protocol_blacklist, h);
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if (ret != 0) {
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av_log(h, AV_LOG_ERROR, "ffurl_open failed : %s, %s\n", av_err2str(ret), arg);
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goto url_fail;
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}
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c->logical_size = ffurl_size(c->inner);
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h->is_streamed = c->inner->is_streamed;
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ret = pthread_mutex_init(&c->mutex, NULL);
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if (ret != 0) {
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av_log(h, AV_LOG_ERROR, "pthread_mutex_init failed : %s\n", av_err2str(ret));
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goto mutex_fail;
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}
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ret = pthread_cond_init(&c->cond_wakeup_main, NULL);
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if (ret != 0) {
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av_log(h, AV_LOG_ERROR, "pthread_cond_init failed : %s\n", av_err2str(ret));
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goto cond_wakeup_main_fail;
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}
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ret = pthread_cond_init(&c->cond_wakeup_background, NULL);
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if (ret != 0) {
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av_log(h, AV_LOG_ERROR, "pthread_cond_init failed : %s\n", av_err2str(ret));
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goto cond_wakeup_background_fail;
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}
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ret = pthread_create(&c->async_buffer_thread, NULL, async_buffer_task, h);
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if (ret) {
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av_log(h, AV_LOG_ERROR, "pthread_create failed : %s\n", av_err2str(ret));
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goto thread_fail;
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}
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return 0;
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thread_fail:
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pthread_cond_destroy(&c->cond_wakeup_background);
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cond_wakeup_background_fail:
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pthread_cond_destroy(&c->cond_wakeup_main);
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cond_wakeup_main_fail:
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pthread_mutex_destroy(&c->mutex);
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mutex_fail:
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ffurl_close(c->inner);
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url_fail:
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ring_destroy(&c->ring);
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fifo_fail:
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return ret;
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}
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static int async_close(URLContext *h)
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{
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Context *c = h->priv_data;
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int ret;
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pthread_mutex_lock(&c->mutex);
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c->abort_request = 1;
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pthread_cond_signal(&c->cond_wakeup_background);
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pthread_mutex_unlock(&c->mutex);
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ret = pthread_join(c->async_buffer_thread, NULL);
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if (ret != 0)
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av_log(h, AV_LOG_ERROR, "pthread_join(): %s\n", av_err2str(ret));
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pthread_cond_destroy(&c->cond_wakeup_background);
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pthread_cond_destroy(&c->cond_wakeup_main);
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pthread_mutex_destroy(&c->mutex);
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ffurl_close(c->inner);
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ring_destroy(&c->ring);
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return 0;
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}
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static int async_read_internal(URLContext *h, void *dest, int size, int read_complete,
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void (*func)(void*, void*, int))
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{
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Context *c = h->priv_data;
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RingBuffer *ring = &c->ring;
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int to_read = size;
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int ret = 0;
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pthread_mutex_lock(&c->mutex);
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while (to_read > 0) {
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int fifo_size, to_copy;
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if (async_check_interrupt(h)) {
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ret = AVERROR_EXIT;
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break;
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}
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fifo_size = ring_size(ring);
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to_copy = FFMIN(to_read, fifo_size);
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if (to_copy > 0) {
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ring_generic_read(ring, dest, to_copy, func);
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if (!func)
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dest = (uint8_t *)dest + to_copy;
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c->logical_pos += to_copy;
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to_read -= to_copy;
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ret = size - to_read;
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if (to_read <= 0 || !read_complete)
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break;
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} else if (c->io_eof_reached) {
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if (ret <= 0) {
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if (c->io_error)
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ret = c->io_error;
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else
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ret = AVERROR_EOF;
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}
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break;
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}
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pthread_cond_signal(&c->cond_wakeup_background);
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pthread_cond_wait(&c->cond_wakeup_main, &c->mutex);
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}
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pthread_cond_signal(&c->cond_wakeup_background);
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pthread_mutex_unlock(&c->mutex);
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return ret;
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}
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static int async_read(URLContext *h, unsigned char *buf, int size)
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{
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return async_read_internal(h, buf, size, 0, NULL);
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}
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static void fifo_do_not_copy_func(void* dest, void* src, int size) {
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// do not copy
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}
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static int64_t async_seek(URLContext *h, int64_t pos, int whence)
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{
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Context *c = h->priv_data;
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RingBuffer *ring = &c->ring;
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int64_t ret;
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int64_t new_logical_pos;
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int fifo_size;
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int fifo_size_of_read_back;
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if (whence == AVSEEK_SIZE) {
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av_log(h, AV_LOG_TRACE, "async_seek: AVSEEK_SIZE: %"PRId64"\n", (int64_t)c->logical_size);
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return c->logical_size;
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} else if (whence == SEEK_CUR) {
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av_log(h, AV_LOG_TRACE, "async_seek: %"PRId64"\n", pos);
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new_logical_pos = pos + c->logical_pos;
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} else if (whence == SEEK_SET){
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av_log(h, AV_LOG_TRACE, "async_seek: %"PRId64"\n", pos);
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new_logical_pos = pos;
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} else {
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return AVERROR(EINVAL);
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}
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if (new_logical_pos < 0)
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return AVERROR(EINVAL);
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fifo_size = ring_size(ring);
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fifo_size_of_read_back = ring_size_of_read_back(ring);
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if (new_logical_pos == c->logical_pos) {
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/* current position */
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return c->logical_pos;
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} else if ((new_logical_pos >= (c->logical_pos - fifo_size_of_read_back)) &&
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(new_logical_pos < (c->logical_pos + fifo_size + SHORT_SEEK_THRESHOLD))) {
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int pos_delta = (int)(new_logical_pos - c->logical_pos);
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/* fast seek */
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av_log(h, AV_LOG_TRACE, "async_seek: fask_seek %"PRId64" from %d dist:%d/%d\n",
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new_logical_pos, (int)c->logical_pos,
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(int)(new_logical_pos - c->logical_pos), fifo_size);
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if (pos_delta > 0) {
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// fast seek forwards
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async_read_internal(h, NULL, pos_delta, 1, fifo_do_not_copy_func);
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} else {
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// fast seek backwards
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ring_drain(ring, pos_delta);
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c->logical_pos = new_logical_pos;
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}
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return c->logical_pos;
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} else if (c->logical_size <= 0) {
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/* can not seek */
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return AVERROR(EINVAL);
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} else if (new_logical_pos > c->logical_size) {
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/* beyond end */
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return AVERROR(EINVAL);
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}
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pthread_mutex_lock(&c->mutex);
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c->seek_request = 1;
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c->seek_pos = new_logical_pos;
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c->seek_whence = SEEK_SET;
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c->seek_completed = 0;
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c->seek_ret = 0;
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while (1) {
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if (async_check_interrupt(h)) {
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ret = AVERROR_EXIT;
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break;
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}
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if (c->seek_completed) {
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if (c->seek_ret >= 0)
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c->logical_pos = c->seek_ret;
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ret = c->seek_ret;
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break;
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}
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pthread_cond_signal(&c->cond_wakeup_background);
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pthread_cond_wait(&c->cond_wakeup_main, &c->mutex);
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}
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pthread_mutex_unlock(&c->mutex);
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return ret;
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}
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#define OFFSET(x) offsetof(Context, x)
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#define D AV_OPT_FLAG_DECODING_PARAM
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static const AVOption options[] = {
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{NULL},
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};
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#undef D
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#undef OFFSET
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static const AVClass async_context_class = {
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.class_name = "Async",
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.item_name = av_default_item_name,
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.option = options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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const URLProtocol ff_async_protocol = {
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.name = "async",
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.url_open2 = async_open,
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.url_read = async_read,
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.url_seek = async_seek,
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.url_close = async_close,
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.priv_data_size = sizeof(Context),
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.priv_data_class = &async_context_class,
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};
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#if 0
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#define TEST_SEEK_POS (1536)
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#define TEST_STREAM_SIZE (2048)
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typedef struct TestContext {
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AVClass *class;
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int64_t logical_pos;
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int64_t logical_size;
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/* options */
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int opt_read_error;
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} TestContext;
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static int async_test_open(URLContext *h, const char *arg, int flags, AVDictionary **options)
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{
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TestContext *c = h->priv_data;
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c->logical_pos = 0;
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c->logical_size = TEST_STREAM_SIZE;
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return 0;
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|
}
|
|
|
|
static int async_test_close(URLContext *h)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int async_test_read(URLContext *h, unsigned char *buf, int size)
|
|
{
|
|
TestContext *c = h->priv_data;
|
|
int i;
|
|
int read_len = 0;
|
|
|
|
if (c->opt_read_error)
|
|
return c->opt_read_error;
|
|
|
|
if (c->logical_pos >= c->logical_size)
|
|
return AVERROR_EOF;
|
|
|
|
for (i = 0; i < size; ++i) {
|
|
buf[i] = c->logical_pos & 0xFF;
|
|
|
|
c->logical_pos++;
|
|
read_len++;
|
|
|
|
if (c->logical_pos >= c->logical_size)
|
|
break;
|
|
}
|
|
|
|
return read_len;
|
|
}
|
|
|
|
static int64_t async_test_seek(URLContext *h, int64_t pos, int whence)
|
|
{
|
|
TestContext *c = h->priv_data;
|
|
int64_t new_logical_pos;
|
|
|
|
if (whence == AVSEEK_SIZE) {
|
|
return c->logical_size;
|
|
} else if (whence == SEEK_CUR) {
|
|
new_logical_pos = pos + c->logical_pos;
|
|
} else if (whence == SEEK_SET){
|
|
new_logical_pos = pos;
|
|
} else {
|
|
return AVERROR(EINVAL);
|
|
}
|
|
if (new_logical_pos < 0)
|
|
return AVERROR(EINVAL);
|
|
|
|
c->logical_pos = new_logical_pos;
|
|
return new_logical_pos;
|
|
}
|
|
|
|
#define OFFSET(x) offsetof(TestContext, x)
|
|
#define D AV_OPT_FLAG_DECODING_PARAM
|
|
|
|
static const AVOption async_test_options[] = {
|
|
{ "async-test-read-error", "cause read fail",
|
|
OFFSET(opt_read_error), AV_OPT_TYPE_INT, { .i64 = 0 }, INT_MIN, INT_MAX, .flags = D },
|
|
{NULL},
|
|
};
|
|
|
|
#undef D
|
|
#undef OFFSET
|
|
|
|
static const AVClass async_test_context_class = {
|
|
.class_name = "Async-Test",
|
|
.item_name = av_default_item_name,
|
|
.option = async_test_options,
|
|
.version = LIBAVUTIL_VERSION_INT,
|
|
};
|
|
|
|
const URLProtocol ff_async_test_protocol = {
|
|
.name = "async-test",
|
|
.url_open2 = async_test_open,
|
|
.url_read = async_test_read,
|
|
.url_seek = async_test_seek,
|
|
.url_close = async_test_close,
|
|
.priv_data_size = sizeof(TestContext),
|
|
.priv_data_class = &async_test_context_class,
|
|
};
|
|
|
|
int main(void)
|
|
{
|
|
URLContext *h = NULL;
|
|
int i;
|
|
int ret;
|
|
int64_t size;
|
|
int64_t pos;
|
|
int64_t read_len;
|
|
unsigned char buf[4096];
|
|
AVDictionary *opts = NULL;
|
|
|
|
ffurl_register_protocol(&ff_async_protocol);
|
|
ffurl_register_protocol(&ff_async_test_protocol);
|
|
|
|
/*
|
|
* test normal read
|
|
*/
|
|
ret = ffurl_open(&h, "async:async-test:", AVIO_FLAG_READ, NULL, NULL);
|
|
printf("open: %d\n", ret);
|
|
|
|
size = ffurl_size(h);
|
|
printf("size: %"PRId64"\n", size);
|
|
|
|
pos = ffurl_seek(h, 0, SEEK_CUR);
|
|
read_len = 0;
|
|
while (1) {
|
|
ret = ffurl_read(h, buf, sizeof(buf));
|
|
if (ret == AVERROR_EOF) {
|
|
printf("read-error: AVERROR_EOF at %"PRId64"\n", ffurl_seek(h, 0, SEEK_CUR));
|
|
break;
|
|
}
|
|
else if (ret == 0)
|
|
break;
|
|
else if (ret < 0) {
|
|
printf("read-error: %d at %"PRId64"\n", ret, ffurl_seek(h, 0, SEEK_CUR));
|
|
goto fail;
|
|
} else {
|
|
for (i = 0; i < ret; ++i) {
|
|
if (buf[i] != (pos & 0xFF)) {
|
|
printf("read-mismatch: actual %d, expecting %d, at %"PRId64"\n",
|
|
(int)buf[i], (int)(pos & 0xFF), pos);
|
|
break;
|
|
}
|
|
pos++;
|
|
}
|
|
}
|
|
|
|
read_len += ret;
|
|
}
|
|
printf("read: %"PRId64"\n", read_len);
|
|
|
|
/*
|
|
* test normal seek
|
|
*/
|
|
ret = ffurl_read(h, buf, 1);
|
|
printf("read: %d\n", ret);
|
|
|
|
pos = ffurl_seek(h, TEST_SEEK_POS, SEEK_SET);
|
|
printf("seek: %"PRId64"\n", pos);
|
|
|
|
read_len = 0;
|
|
while (1) {
|
|
ret = ffurl_read(h, buf, sizeof(buf));
|
|
if (ret == AVERROR_EOF)
|
|
break;
|
|
else if (ret == 0)
|
|
break;
|
|
else if (ret < 0) {
|
|
printf("read-error: %d at %"PRId64"\n", ret, ffurl_seek(h, 0, SEEK_CUR));
|
|
goto fail;
|
|
} else {
|
|
for (i = 0; i < ret; ++i) {
|
|
if (buf[i] != (pos & 0xFF)) {
|
|
printf("read-mismatch: actual %d, expecting %d, at %"PRId64"\n",
|
|
(int)buf[i], (int)(pos & 0xFF), pos);
|
|
break;
|
|
}
|
|
pos++;
|
|
}
|
|
}
|
|
|
|
read_len += ret;
|
|
}
|
|
printf("read: %"PRId64"\n", read_len);
|
|
|
|
ret = ffurl_read(h, buf, 1);
|
|
printf("read: %d\n", ret);
|
|
|
|
/*
|
|
* test read error
|
|
*/
|
|
ffurl_close(h);
|
|
av_dict_set_int(&opts, "async-test-read-error", -10000, 0);
|
|
ret = ffurl_open(&h, "async:async-test:", AVIO_FLAG_READ, NULL, &opts);
|
|
printf("open: %d\n", ret);
|
|
|
|
ret = ffurl_read(h, buf, 1);
|
|
printf("read: %d\n", ret);
|
|
|
|
fail:
|
|
av_dict_free(&opts);
|
|
ffurl_close(h);
|
|
return 0;
|
|
}
|
|
|
|
#endif
|