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530 lines
10 KiB
530 lines
10 KiB
/*
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* packets.c
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*
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* Copyright (C) Thomas Oestreich - June 2001
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*
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* This file is part of transcode, a video stream processing tool
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*
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* transcode 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, or (at your option)
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* any later version.
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*
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* transcode 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 GNU Make; see the file COPYING. If not, write to
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* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include "transcode.h"
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#include "libtc/libtc.h"
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#include "packets.h"
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#define FLUSH_BUFFER_MAX (1024<<4)
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pthread_mutex_t packet_list_lock=PTHREAD_MUTEX_INITIALIZER;
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pthread_mutex_t pack_ctr_lock=PTHREAD_MUTEX_INITIALIZER;
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packet_list_t *packet_list_head;
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packet_list_t *packet_list_tail;
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static int sbuf_max = 0;
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static int sbuf_next= 0;
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static packet_list_t **sbuf_ptr; char *sbuf_mem;
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//important internal parameter and counter
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static int verbose_flag=TC_QUIET;
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static int pack_ctr, pack_fill_ctr=0;
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static int ifd=0;
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pthread_cond_t packet_pop_cv=PTHREAD_COND_INITIALIZER;
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pthread_cond_t packet_push_cv=PTHREAD_COND_INITIALIZER;
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static pthread_t packet_thread;
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extern int seq_info_delay(void);
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packet_list_t *packet_register(int id)
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{
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/* objectives:
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===========
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register new packet
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allocate space for packet buffer and establish backward reference
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requirements:
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=============
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thread-safe
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global mutex: packet_list_lock
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*/
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packet_list_t *ptr;
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pthread_mutex_lock(&packet_list_lock);
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// retrieve a valid pointer from the pool
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#ifdef STATBUFFER
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if(verbose_flag & TC_FLIST)
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tc_log_msg(__FILE__, "packet id=%d", id);
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if((ptr = sbuf_retrieve()) == NULL) {
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pthread_mutex_unlock(&packet_list_lock);
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return(NULL);
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}
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#else
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if((ptr = tc_malloc(sizeof(packet_list_t))) == NULL) {
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pthread_mutex_unlock(&packet_list_lock);
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return(NULL);
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}
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#endif
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ptr->status = PACKET_EMPTY;
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ptr->next = NULL;
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ptr->prev = NULL;
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ptr->id = id;
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if(packet_list_tail != NULL)
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{
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packet_list_tail->next = ptr;
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ptr->prev = packet_list_tail;
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}
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packet_list_tail = ptr;
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/* first packet registered must set packet_list_head */
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if(packet_list_head == NULL) packet_list_head = ptr;
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pthread_mutex_unlock(&packet_list_lock);
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return(ptr);
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}
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/* ------------------------------------------------------------------ */
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void packet_remove(packet_list_t *ptr)
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{
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/* objectives:
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===========
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remove packet from chained list
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requirements:
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=============
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thread-safe
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*/
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if(ptr == NULL) return; // do nothing if null pointer
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pthread_mutex_lock(&packet_list_lock);
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if(ptr->prev != NULL) (ptr->prev)->next = ptr->next;
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if(ptr->next != NULL) (ptr->next)->prev = ptr->prev;
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if(ptr == packet_list_tail) packet_list_tail = ptr->prev;
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if(ptr == packet_list_head) packet_list_head = ptr->next;
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// release valid pointer to pool
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ptr->status = PACKET_EMPTY;
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#ifdef STATBUFFER
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sbuf_release(ptr);
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#else
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free(ptr);
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#endif
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pthread_mutex_unlock(&packet_list_lock);
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}
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/* ------------------------------------------------------------------ */
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packet_list_t *packet_retrieve()
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{
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/* objectives:
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===========
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get pointer to next packet for rendering
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requirements:
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=============
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thread-safe
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*/
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packet_list_t *ptr;
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pthread_mutex_lock(&packet_list_lock);
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ptr = packet_list_head;
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/* move along the chain and check for status */
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while(ptr != NULL)
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{
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if(ptr->status == PACKET_READY)
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{
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pthread_mutex_unlock(&packet_list_lock);
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return(ptr);
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}
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ptr = ptr->next;
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}
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pthread_mutex_unlock(&packet_list_lock);
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return(NULL);
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}
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/* ------------------------------------------------------------------ */
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int sbuf_alloc(int ex_num)
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{
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/* objectives:
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===========
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allocate memory for ringbuffer structure
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return -1 on failure, 0 on success
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*/
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int n, num;
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if(ex_num < 0) return(-1);
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num = ex_num + 2; //alloc some more because
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if((sbuf_ptr = tc_zalloc(num * sizeof(packet_list_t *)))==NULL) {
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tc_log_perror(__FILE__, "out of memory");
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return(-1);
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}
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if((sbuf_mem = tc_zalloc(num * sizeof(packet_list_t)))==NULL) {
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tc_log_perror(__FILE__, "out of memory");
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return(-1);
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}
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// init ringbuffer
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for (n=0; n<num; ++n) {
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sbuf_ptr[n] = (packet_list_t *) (sbuf_mem + n * sizeof(packet_list_t));
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sbuf_ptr[n]->status = PACKET_NULL;
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sbuf_ptr[n]->bufid = n;
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}
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// assign to static
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sbuf_max = num;
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return(0);
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}
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/* ------------------------------------------------------------------ */
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void sbuf_free()
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{
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/* objectives:
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===========
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free memory for ringbuffer structure
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*/
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if(sbuf_max > 0) {
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free(sbuf_ptr);
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free(sbuf_mem);
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}
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}
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/* ------------------------------------------------------------------ */
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packet_list_t *sbuf_retrieve()
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{
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/* objectives:
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===========
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retrieve a valid pointer to a packet_list_t structure
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return NULL on failure, valid pointer on success
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thread safe
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*/
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packet_list_t *ptr;
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ptr = sbuf_ptr[sbuf_next];
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// check, if this structure is really free to reuse
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if(ptr->status != PACKET_NULL) return(NULL);
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// ok
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if(verbose_flag & TC_FLIST)
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tc_log_msg(__FILE__, "alloc =%d [%d]", sbuf_next, ptr->bufid);
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++sbuf_next;
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sbuf_next %= sbuf_max;
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return(ptr);
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}
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/* ------------------------------------------------------------------ */
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int sbuf_release(packet_list_t *ptr)
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{
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/* objectives:
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===========
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release a valid pointer to a packet_list_t structure
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return -1 on failure, 0 on success
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thread safe
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*/
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// instead of freeing the memory and setting the pointer
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// to NULL we only change a flag
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if(ptr == NULL) return(-1);
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if(ptr->status != PACKET_EMPTY) {
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return(-1);
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} else {
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if(verbose_flag & TC_FLIST)
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tc_log_msg(__FILE__, "release=%d [%d]", sbuf_next, ptr->bufid);
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ptr->status = PACKET_NULL;
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}
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return(0);
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}
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/* ------------------------------------------------------------------
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*
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* packet buffer management
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*
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* API: flush_buffer_init
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* flush_buffer_write
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* flush_buffer_close
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*
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*-------------------------------------------------------------------*/
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int packet_buffer_flush()
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{
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/* objectives:
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===========
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flush a packet and release memory
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requirements:
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=============
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thread-safe
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*/
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packet_list_t *ptr;
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size_t n = 0;
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ptr = packet_retrieve();
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pthread_mutex_lock(&pack_ctr_lock);
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//info:
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if(verbose_flag & TC_SYNC)
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tc_log_msg(__FILE__, "packet buffer status (%03d/%03d) [%.1f%%]", pack_ctr, pack_fill_ctr, (double) 100*pack_fill_ctr/FLUSH_BUFFER_MAX);
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pthread_mutex_unlock(&pack_ctr_lock);
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if(ptr==NULL) {
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//Ooops, shouldn't happen
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return(-1);
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}
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n = tc_pwrite(ifd, ptr->buffer, ptr->size);
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if(verbose_flag & TC_SYNC)
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tc_log_msg(__FILE__, "done writing packet (%d/%03d)", ptr->id, pack_ctr);
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// no release, if not set!
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ptr->status = PACKET_EMPTY;
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packet_remove(ptr);
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return(0);
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}
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/* ------------------------------------------------------------------ */
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static void flush_buffer_thread(void)
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{
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int tt;
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for (;;) {
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pthread_mutex_lock(&pack_ctr_lock);
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while(pack_fill_ctr==0) {
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pthread_cond_wait(&packet_pop_cv, &pack_ctr_lock);
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#ifdef BROKEN_PTHREADS // Used to be MacOSX specific; kernel 2.6 as well?
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pthread_testcancel();
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#endif
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}
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pthread_mutex_unlock(&pack_ctr_lock);
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if(packet_buffer_flush()==0) {
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pthread_mutex_lock(&pack_ctr_lock);
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tt=pack_fill_ctr;
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--pack_fill_ctr;
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pthread_mutex_unlock(&pack_ctr_lock);
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//notify submissions
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if(tt==FLUSH_BUFFER_MAX) pthread_cond_signal(&packet_push_cv);
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}
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}
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return;
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}
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/* ------------------------------------------------------------------ */
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int flush_buffer_init(int _ifd, int _verbose)
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{
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ifd=_ifd;
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verbose_flag = _verbose;
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pack_fill_ctr=0;
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#ifdef STATBUFFER
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// allocate buffer
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if(verbose_flag & TC_DEBUG)
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tc_log_msg(__FILE__, "allocating %d framebuffer (static)", FLUSH_BUFFER_MAX);
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if(sbuf_alloc(FLUSH_BUFFER_MAX)<0) {
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tc_log_error(__FILE__, "static framebuffer allocation failed");
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exit(1);
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}
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#else
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if(verbose_flag & TC_DEBUG)
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tc_log_msg(__FILE__, "%d framebuffer (dynamic) requested", FLUSH_BUFFER_MAX);
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#endif
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// start the flush thread
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if(pthread_create(&packet_thread, NULL, (void *) flush_buffer_thread, NULL)!=0) {
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tc_log_error(__FILE__, "failed to start packet flush thread");
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return(-1);
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} else {
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if(verbose_flag & TC_SYNC)
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tc_log_msg(__FILE__, "flush buffer thread started");
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}
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return(0);
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}
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/* ------------------------------------------------------------------ */
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int flush_buffer_write(int fd_out, char*buffer, int packet_size)
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{
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packet_list_t *pack_ptr=NULL;
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pthread_mutex_lock(&pack_ctr_lock);
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while(pack_fill_ctr == FLUSH_BUFFER_MAX) {
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pthread_cond_wait(&packet_push_cv, &pack_ctr_lock);
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#ifdef BROKEN_PTHREADS // Used to be MacOSX specific; kernel 2.6 as well?
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pthread_testcancel();
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#endif
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}
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pthread_mutex_unlock(&pack_ctr_lock);
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pack_ptr = packet_register(pack_ctr);
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ac_memcpy(pack_ptr->buffer, buffer, packet_size);
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pack_ptr->size = packet_size;
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pack_ptr->status = PACKET_READY; //packet ready to go
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//total processed packets
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++pack_ctr;
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pthread_mutex_lock(&pack_ctr_lock);
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++pack_fill_ctr;
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//info: buffer status
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if(verbose_flag & TC_SYNC)
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tc_log_msg(__FILE__, "packet submitted to flush buffer (%03d/%03d) [%.1f%%]", pack_ctr, pack_fill_ctr, (double) 100*pack_fill_ctr/FLUSH_BUFFER_MAX);
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pthread_mutex_unlock(&pack_ctr_lock);
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//notify write thread
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pthread_cond_signal(&packet_pop_cv);
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return(packet_size);
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}
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/* ------------------------------------------------------------------ */
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int flush_buffer_close()
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{
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pthread_mutex_lock(&pack_ctr_lock);
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while(pack_fill_ctr>0) {
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pthread_mutex_unlock(&pack_ctr_lock);
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usleep(TC_DELAY_MAX);
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pthread_mutex_lock(&pack_ctr_lock);
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}
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pthread_mutex_unlock(&pack_ctr_lock);
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return(0);
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}
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