b363d65625
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@6086 a1c6a512-1295-4272-9138-f99709370657
1126 lines
29 KiB
C
1126 lines
29 KiB
C
/********************************************************************
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* *
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* THIS FILE IS PART OF THE OggVorbis 'TREMOR' CODEC SOURCE CODE. *
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* *
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* USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
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* GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
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* IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
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* *
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* THE OggVorbis 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2003 *
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* BY THE Xiph.Org FOUNDATION http://www.xiph.org/ *
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* *
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********************************************************************
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function: decode Ogg streams back into raw packets
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note: The CRC code is directly derived from public domain code by
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Ross Williams (ross@guest.adelaide.edu.au). See docs/framing.html
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for details.
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********************************************************************/
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#include "config-tremor.h"
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#include <string.h>
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#include "ogg.h"
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#include "misc.h"
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/* A complete description of Ogg framing exists in docs/framing.html */
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/* basic, centralized Ogg memory management based on linked lists of
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references to refcounted memory buffers. References and buffers
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are both recycled. Buffers are passed around and consumed in
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reference form. */
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static ogg_buffer_state *ogg_buffer_create(void){
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ogg_buffer_state *bs=_ogg_calloc(1,sizeof(*bs));
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return bs;
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}
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/* destruction is 'lazy'; there may be memory references outstanding,
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and yanking the buffer state out from underneath would be
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antisocial. Dealloc what is currently unused and have
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_release_one watch for the stragglers to come in. When they do,
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finish destruction. */
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/* call the helper while holding lock */
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static void _ogg_buffer_destroy(ogg_buffer_state *bs){
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ogg_buffer *bt;
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ogg_reference *rt;
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if(bs->shutdown){
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bt=bs->unused_buffers;
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rt=bs->unused_references;
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if(!bs->outstanding){
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_ogg_free(bs);
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return;
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}
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while(bt){
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ogg_buffer *b=bt;
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bt=b->ptr.next;
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if(b->data)_ogg_free(b->data);
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_ogg_free(b);
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}
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bs->unused_buffers=0;
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while(rt){
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ogg_reference *r=rt;
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rt=r->next;
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_ogg_free(r);
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}
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bs->unused_references=0;
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}
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}
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static void ogg_buffer_destroy(ogg_buffer_state *bs){
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bs->shutdown=1;
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_ogg_buffer_destroy(bs);
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}
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static ogg_buffer *_fetch_buffer(ogg_buffer_state *bs,long bytes){
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ogg_buffer *ob;
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bs->outstanding++;
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/* do we have an unused buffer sitting in the pool? */
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if(bs->unused_buffers){
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ob=bs->unused_buffers;
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bs->unused_buffers=ob->ptr.next;
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/* if the unused buffer is too small, grow it */
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if(ob->size<bytes){
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ob->data=_ogg_realloc(ob->data,bytes);
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ob->size=bytes;
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}
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}else{
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/* allocate a new buffer */
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ob=_ogg_malloc(sizeof(*ob));
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ob->data=_ogg_malloc(bytes<16?16:bytes);
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ob->size=bytes;
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}
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ob->refcount=1;
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ob->ptr.owner=bs;
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return ob;
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}
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static ogg_reference *_fetch_ref(ogg_buffer_state *bs){
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ogg_reference *or;
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bs->outstanding++;
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/* do we have an unused reference sitting in the pool? */
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if(bs->unused_references){
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or=bs->unused_references;
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bs->unused_references=or->next;
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}else{
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/* allocate a new reference */
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or=_ogg_malloc(sizeof(*or));
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}
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or->begin=0;
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or->length=0;
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or->next=0;
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return or;
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}
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/* fetch a reference pointing to a fresh, initially continguous buffer
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of at least [bytes] length */
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static ogg_reference *ogg_buffer_alloc(ogg_buffer_state *bs,long bytes){
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ogg_buffer *ob=_fetch_buffer(bs,bytes);
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ogg_reference *or=_fetch_ref(bs);
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or->buffer=ob;
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return or;
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}
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/* enlarge the data buffer in the current link */
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static void ogg_buffer_realloc(ogg_reference *or,long bytes){
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ogg_buffer *ob=or->buffer;
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/* if the unused buffer is too small, grow it */
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if(ob->size<bytes){
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ob->data=_ogg_realloc(ob->data,bytes);
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ob->size=bytes;
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}
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}
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static void _ogg_buffer_mark_one(ogg_reference *or){
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or->buffer->refcount++;
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}
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/* increase the refcount of the buffers to which the reference points */
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static void ogg_buffer_mark(ogg_reference *or){
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while(or){
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_ogg_buffer_mark_one(or);
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or=or->next;
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}
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}
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/* duplicate a reference (pointing to the same actual buffer memory)
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and increment buffer refcount. If the desired segment begins out
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of range, NULL is returned; if the desired segment is simply zero
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length, a zero length ref is returned. Partial range overlap
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returns the overlap of the ranges */
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static ogg_reference *ogg_buffer_sub(ogg_reference *or,long begin,long length){
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ogg_reference *ret=0,*head=0;
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/* walk past any preceeding fragments we don't want */
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while(or && begin>=or->length){
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begin-=or->length;
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or=or->next;
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}
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/* duplicate the reference chain; increment refcounts */
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while(or && length){
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ogg_reference *temp=_fetch_ref(or->buffer->ptr.owner);
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if(head)
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head->next=temp;
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else
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ret=temp;
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head=temp;
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head->buffer=or->buffer;
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head->begin=or->begin+begin;
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head->length=length;
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if(head->length>or->length-begin)
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head->length=or->length-begin;
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begin=0;
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length-=head->length;
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or=or->next;
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}
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ogg_buffer_mark(ret);
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return ret;
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}
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ogg_reference *ogg_buffer_dup(ogg_reference *or){
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ogg_reference *ret=0,*head=0;
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/* duplicate the reference chain; increment refcounts */
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while(or){
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ogg_reference *temp=_fetch_ref(or->buffer->ptr.owner);
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if(head)
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head->next=temp;
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else
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ret=temp;
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head=temp;
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head->buffer=or->buffer;
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head->begin=or->begin;
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head->length=or->length;
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or=or->next;
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}
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ogg_buffer_mark(ret);
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return ret;
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}
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/* split a reference into two references; 'return' is a reference to
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the buffer preceeding pos and 'head'/'tail' are the buffer past the
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split. If pos is at or past the end of the passed in segment,
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'head/tail' are NULL */
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static ogg_reference *ogg_buffer_split(ogg_reference **tail,
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ogg_reference **head,long pos){
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/* walk past any preceeding fragments to one of:
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a) the exact boundary that seps two fragments
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b) the fragment that needs split somewhere in the middle */
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ogg_reference *ret=*tail;
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ogg_reference *or=*tail;
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while(or && pos>or->length){
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pos-=or->length;
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or=or->next;
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}
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if(!or || pos==0){
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return 0;
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}else{
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if(pos>=or->length){
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/* exact split, or off the end? */
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if(or->next){
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/* a split */
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*tail=or->next;
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or->next=0;
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}else{
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/* off or at the end */
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*tail=*head=0;
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}
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}else{
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/* split within a fragment */
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long lengthA=pos;
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long beginB=or->begin+pos;
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long lengthB=or->length-pos;
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/* make a new reference to tail the second piece */
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*tail=_fetch_ref(or->buffer->ptr.owner);
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(*tail)->buffer=or->buffer;
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(*tail)->begin=beginB;
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(*tail)->length=lengthB;
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(*tail)->next=or->next;
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_ogg_buffer_mark_one(*tail);
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if(head && or==*head)*head=*tail;
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/* update the first piece */
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or->next=0;
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or->length=lengthA;
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}
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}
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return ret;
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}
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static void ogg_buffer_release_one(ogg_reference *or){
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ogg_buffer *ob=or->buffer;
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ogg_buffer_state *bs=ob->ptr.owner;
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ob->refcount--;
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if(ob->refcount==0){
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bs->outstanding--; /* for the returned buffer */
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ob->ptr.next=bs->unused_buffers;
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bs->unused_buffers=ob;
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}
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bs->outstanding--; /* for the returned reference */
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or->next=bs->unused_references;
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bs->unused_references=or;
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_ogg_buffer_destroy(bs); /* lazy cleanup (if needed) */
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}
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/* release the references, decrease the refcounts of buffers to which
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they point, release any buffers with a refcount that drops to zero */
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static void ogg_buffer_release(ogg_reference *or){
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while(or){
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ogg_reference *next=or->next;
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ogg_buffer_release_one(or);
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or=next;
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}
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}
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static ogg_reference *ogg_buffer_pretruncate(ogg_reference *or,long pos){
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/* release preceeding fragments we don't want */
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while(or && pos>=or->length){
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ogg_reference *next=or->next;
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pos-=or->length;
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ogg_buffer_release_one(or);
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or=next;
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}
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if (or) {
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or->begin+=pos;
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or->length-=pos;
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}
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return or;
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}
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static ogg_reference *ogg_buffer_walk(ogg_reference *or){
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if(!or)return NULL;
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while(or->next){
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or=or->next;
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}
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return(or);
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}
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/* *head is appended to the front end (head) of *tail; both continue to
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be valid pointers, with *tail at the tail and *head at the head */
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static ogg_reference *ogg_buffer_cat(ogg_reference *tail, ogg_reference *head){
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if(!tail)return head;
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while(tail->next){
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tail=tail->next;
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}
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tail->next=head;
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return ogg_buffer_walk(head);
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}
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static void _positionB(oggbyte_buffer *b,int pos){
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if(pos<b->pos){
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/* start at beginning, scan forward */
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b->ref=b->baseref;
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b->pos=0;
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b->end=b->pos+b->ref->length;
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b->ptr=b->ref->buffer->data+b->ref->begin;
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}
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}
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static void _positionF(oggbyte_buffer *b,int pos){
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/* scan forward for position */
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while(pos>=b->end){
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/* just seek forward */
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b->pos+=b->ref->length;
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b->ref=b->ref->next;
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b->end=b->ref->length+b->pos;
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b->ptr=b->ref->buffer->data+b->ref->begin;
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}
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}
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static int oggbyte_init(oggbyte_buffer *b,ogg_reference *or){
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memset(b,0,sizeof(*b));
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if(or){
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b->ref=b->baseref=or;
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b->pos=0;
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b->end=b->ref->length;
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b->ptr=b->ref->buffer->data+b->ref->begin;
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return 0;
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}else
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return -1;
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}
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static void oggbyte_set4(oggbyte_buffer *b,ogg_uint32_t val,int pos){
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int i;
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_positionB(b,pos);
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for(i=0;i<4;i++){
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_positionF(b,pos);
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b->ptr[pos-b->pos]=val;
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val>>=8;
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++pos;
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}
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}
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static unsigned char oggbyte_read1(oggbyte_buffer *b,int pos){
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_positionB(b,pos);
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_positionF(b,pos);
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return b->ptr[pos-b->pos];
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}
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static ogg_uint32_t oggbyte_read4(oggbyte_buffer *b,int pos){
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ogg_uint32_t ret;
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_positionB(b,pos);
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_positionF(b,pos);
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ret=b->ptr[pos-b->pos];
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_positionF(b,++pos);
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ret|=b->ptr[pos-b->pos]<<8;
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_positionF(b,++pos);
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ret|=b->ptr[pos-b->pos]<<16;
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_positionF(b,++pos);
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ret|=b->ptr[pos-b->pos]<<24;
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return ret;
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}
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static ogg_int64_t oggbyte_read8(oggbyte_buffer *b,int pos){
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ogg_int64_t ret;
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unsigned char t[7];
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int i;
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_positionB(b,pos);
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for(i=0;i<7;i++){
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_positionF(b,pos);
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t[i]=b->ptr[pos++ -b->pos];
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}
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_positionF(b,pos);
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ret=b->ptr[pos-b->pos];
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for(i=6;i>=0;--i)
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ret= ret<<8 | t[i];
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return ret;
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}
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/* Now we get to the actual framing code */
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int ogg_page_version(ogg_page *og){
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oggbyte_buffer ob;
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oggbyte_init(&ob,og->header);
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return oggbyte_read1(&ob,4);
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}
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int ogg_page_continued(ogg_page *og){
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oggbyte_buffer ob;
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oggbyte_init(&ob,og->header);
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return oggbyte_read1(&ob,5)&0x01;
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}
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int ogg_page_bos(ogg_page *og){
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oggbyte_buffer ob;
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oggbyte_init(&ob,og->header);
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return oggbyte_read1(&ob,5)&0x02;
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}
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int ogg_page_eos(ogg_page *og){
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oggbyte_buffer ob;
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oggbyte_init(&ob,og->header);
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return oggbyte_read1(&ob,5)&0x04;
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}
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ogg_int64_t ogg_page_granulepos(ogg_page *og){
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oggbyte_buffer ob;
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oggbyte_init(&ob,og->header);
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return oggbyte_read8(&ob,6);
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}
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ogg_uint32_t ogg_page_serialno(ogg_page *og){
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oggbyte_buffer ob;
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oggbyte_init(&ob,og->header);
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return oggbyte_read4(&ob,14);
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}
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ogg_uint32_t ogg_page_pageno(ogg_page *og){
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oggbyte_buffer ob;
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oggbyte_init(&ob,og->header);
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return oggbyte_read4(&ob,18);
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}
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/* returns the number of packets that are completed on this page (if
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the leading packet is begun on a previous page, but ends on this
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page, it's counted */
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/* NOTE:
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If a page consists of a packet begun on a previous page, and a new
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packet begun (but not completed) on this page, the return will be:
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ogg_page_packets(page) ==1,
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ogg_page_continued(page) !=0
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If a page happens to be a single packet that was begun on a
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previous page, and spans to the next page (in the case of a three or
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more page packet), the return will be:
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ogg_page_packets(page) ==0,
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ogg_page_continued(page) !=0
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*/
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int ogg_page_packets(ogg_page *og){
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int i;
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int n;
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int count=0;
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oggbyte_buffer ob;
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oggbyte_init(&ob,og->header);
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n=oggbyte_read1(&ob,26);
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for(i=0;i<n;i++)
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if(oggbyte_read1(&ob,27+i)<255)count++;
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return(count);
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}
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/* Static CRC calculation table. See older code in CVS for dead
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run-time initialization code. */
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static ogg_uint32_t crc_lookup[256]={
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0x00000000,0x04c11db7,0x09823b6e,0x0d4326d9,
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0x130476dc,0x17c56b6b,0x1a864db2,0x1e475005,
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0x2608edb8,0x22c9f00f,0x2f8ad6d6,0x2b4bcb61,
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0x350c9b64,0x31cd86d3,0x3c8ea00a,0x384fbdbd,
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0x4c11db70,0x48d0c6c7,0x4593e01e,0x4152fda9,
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0x5f15adac,0x5bd4b01b,0x569796c2,0x52568b75,
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0x6a1936c8,0x6ed82b7f,0x639b0da6,0x675a1011,
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0x791d4014,0x7ddc5da3,0x709f7b7a,0x745e66cd,
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0x9823b6e0,0x9ce2ab57,0x91a18d8e,0x95609039,
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0x8b27c03c,0x8fe6dd8b,0x82a5fb52,0x8664e6e5,
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0xbe2b5b58,0xbaea46ef,0xb7a96036,0xb3687d81,
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0xad2f2d84,0xa9ee3033,0xa4ad16ea,0xa06c0b5d,
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0xd4326d90,0xd0f37027,0xddb056fe,0xd9714b49,
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0xc7361b4c,0xc3f706fb,0xceb42022,0xca753d95,
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0xf23a8028,0xf6fb9d9f,0xfbb8bb46,0xff79a6f1,
|
|
0xe13ef6f4,0xe5ffeb43,0xe8bccd9a,0xec7dd02d,
|
|
0x34867077,0x30476dc0,0x3d044b19,0x39c556ae,
|
|
0x278206ab,0x23431b1c,0x2e003dc5,0x2ac12072,
|
|
0x128e9dcf,0x164f8078,0x1b0ca6a1,0x1fcdbb16,
|
|
0x018aeb13,0x054bf6a4,0x0808d07d,0x0cc9cdca,
|
|
0x7897ab07,0x7c56b6b0,0x71159069,0x75d48dde,
|
|
0x6b93dddb,0x6f52c06c,0x6211e6b5,0x66d0fb02,
|
|
0x5e9f46bf,0x5a5e5b08,0x571d7dd1,0x53dc6066,
|
|
0x4d9b3063,0x495a2dd4,0x44190b0d,0x40d816ba,
|
|
0xaca5c697,0xa864db20,0xa527fdf9,0xa1e6e04e,
|
|
0xbfa1b04b,0xbb60adfc,0xb6238b25,0xb2e29692,
|
|
0x8aad2b2f,0x8e6c3698,0x832f1041,0x87ee0df6,
|
|
0x99a95df3,0x9d684044,0x902b669d,0x94ea7b2a,
|
|
0xe0b41de7,0xe4750050,0xe9362689,0xedf73b3e,
|
|
0xf3b06b3b,0xf771768c,0xfa325055,0xfef34de2,
|
|
0xc6bcf05f,0xc27dede8,0xcf3ecb31,0xcbffd686,
|
|
0xd5b88683,0xd1799b34,0xdc3abded,0xd8fba05a,
|
|
0x690ce0ee,0x6dcdfd59,0x608edb80,0x644fc637,
|
|
0x7a089632,0x7ec98b85,0x738aad5c,0x774bb0eb,
|
|
0x4f040d56,0x4bc510e1,0x46863638,0x42472b8f,
|
|
0x5c007b8a,0x58c1663d,0x558240e4,0x51435d53,
|
|
0x251d3b9e,0x21dc2629,0x2c9f00f0,0x285e1d47,
|
|
0x36194d42,0x32d850f5,0x3f9b762c,0x3b5a6b9b,
|
|
0x0315d626,0x07d4cb91,0x0a97ed48,0x0e56f0ff,
|
|
0x1011a0fa,0x14d0bd4d,0x19939b94,0x1d528623,
|
|
0xf12f560e,0xf5ee4bb9,0xf8ad6d60,0xfc6c70d7,
|
|
0xe22b20d2,0xe6ea3d65,0xeba91bbc,0xef68060b,
|
|
0xd727bbb6,0xd3e6a601,0xdea580d8,0xda649d6f,
|
|
0xc423cd6a,0xc0e2d0dd,0xcda1f604,0xc960ebb3,
|
|
0xbd3e8d7e,0xb9ff90c9,0xb4bcb610,0xb07daba7,
|
|
0xae3afba2,0xaafbe615,0xa7b8c0cc,0xa379dd7b,
|
|
0x9b3660c6,0x9ff77d71,0x92b45ba8,0x9675461f,
|
|
0x8832161a,0x8cf30bad,0x81b02d74,0x857130c3,
|
|
0x5d8a9099,0x594b8d2e,0x5408abf7,0x50c9b640,
|
|
0x4e8ee645,0x4a4ffbf2,0x470cdd2b,0x43cdc09c,
|
|
0x7b827d21,0x7f436096,0x7200464f,0x76c15bf8,
|
|
0x68860bfd,0x6c47164a,0x61043093,0x65c52d24,
|
|
0x119b4be9,0x155a565e,0x18197087,0x1cd86d30,
|
|
0x029f3d35,0x065e2082,0x0b1d065b,0x0fdc1bec,
|
|
0x3793a651,0x3352bbe6,0x3e119d3f,0x3ad08088,
|
|
0x2497d08d,0x2056cd3a,0x2d15ebe3,0x29d4f654,
|
|
0xc5a92679,0xc1683bce,0xcc2b1d17,0xc8ea00a0,
|
|
0xd6ad50a5,0xd26c4d12,0xdf2f6bcb,0xdbee767c,
|
|
0xe3a1cbc1,0xe760d676,0xea23f0af,0xeee2ed18,
|
|
0xf0a5bd1d,0xf464a0aa,0xf9278673,0xfde69bc4,
|
|
0x89b8fd09,0x8d79e0be,0x803ac667,0x84fbdbd0,
|
|
0x9abc8bd5,0x9e7d9662,0x933eb0bb,0x97ffad0c,
|
|
0xafb010b1,0xab710d06,0xa6322bdf,0xa2f33668,
|
|
0xbcb4666d,0xb8757bda,0xb5365d03,0xb1f740b4};
|
|
|
|
ogg_sync_state *ogg_sync_create(void){
|
|
ogg_sync_state *oy=_ogg_calloc(1,sizeof(*oy));
|
|
memset(oy,0,sizeof(*oy));
|
|
oy->bufferpool=ogg_buffer_create();
|
|
return oy;
|
|
}
|
|
|
|
int ogg_sync_destroy(ogg_sync_state *oy){
|
|
if(oy){
|
|
ogg_sync_reset(oy);
|
|
ogg_buffer_destroy(oy->bufferpool);
|
|
memset(oy,0,sizeof(*oy));
|
|
_ogg_free(oy);
|
|
}
|
|
return OGG_SUCCESS;
|
|
}
|
|
|
|
unsigned char *ogg_sync_bufferin(ogg_sync_state *oy, long bytes){
|
|
|
|
/* [allocate and] expose a buffer for data submission.
|
|
|
|
If there is no head fragment
|
|
allocate one and expose it
|
|
else
|
|
if the current head fragment has sufficient unused space
|
|
expose it
|
|
else
|
|
if the current head fragment is unused
|
|
resize and expose it
|
|
else
|
|
allocate new fragment and expose it
|
|
*/
|
|
|
|
/* base case; fifo uninitialized */
|
|
if(!oy->fifo_head){
|
|
oy->fifo_head=oy->fifo_tail=ogg_buffer_alloc(oy->bufferpool,bytes);
|
|
return oy->fifo_head->buffer->data;
|
|
}
|
|
|
|
/* space left in current fragment case */
|
|
if(oy->fifo_head->buffer->size-
|
|
oy->fifo_head->length-
|
|
oy->fifo_head->begin >= bytes)
|
|
return oy->fifo_head->buffer->data+
|
|
oy->fifo_head->length+oy->fifo_head->begin;
|
|
|
|
/* current fragment is unused, but too small */
|
|
if(!oy->fifo_head->length){
|
|
ogg_buffer_realloc(oy->fifo_head,bytes);
|
|
return oy->fifo_head->buffer->data+oy->fifo_head->begin;
|
|
}
|
|
|
|
/* current fragment used/full; get new fragment */
|
|
{
|
|
ogg_reference *new=ogg_buffer_alloc(oy->bufferpool,bytes);
|
|
oy->fifo_head->next=new;
|
|
oy->fifo_head=new;
|
|
}
|
|
return oy->fifo_head->buffer->data;
|
|
}
|
|
|
|
int ogg_sync_wrote(ogg_sync_state *oy, long bytes){
|
|
if(!oy->fifo_head)return OGG_EINVAL;
|
|
if(oy->fifo_head->buffer->size-oy->fifo_head->length-oy->fifo_head->begin <
|
|
bytes)return OGG_EINVAL;
|
|
oy->fifo_head->length+=bytes;
|
|
oy->fifo_fill+=bytes;
|
|
return OGG_SUCCESS;
|
|
}
|
|
|
|
static ogg_uint32_t _checksum(ogg_reference *or, int bytes){
|
|
ogg_uint32_t crc_reg=0;
|
|
int j,post;
|
|
|
|
while(or){
|
|
unsigned char *data=or->buffer->data+or->begin;
|
|
post=(bytes<or->length?bytes:or->length);
|
|
for(j=0;j<post;++j)
|
|
crc_reg=(crc_reg<<8)^crc_lookup[((crc_reg >> 24)&0xff)^data[j]];
|
|
bytes-=j;
|
|
or=or->next;
|
|
}
|
|
|
|
return crc_reg;
|
|
}
|
|
|
|
|
|
/* sync the stream. This is meant to be useful for finding page
|
|
boundaries.
|
|
|
|
return values for this:
|
|
-n) skipped n bytes
|
|
0) page not ready; more data (no bytes skipped)
|
|
n) page synced at current location; page length n bytes
|
|
|
|
*/
|
|
|
|
long ogg_sync_pageseek(ogg_sync_state *oy,ogg_page *og){
|
|
oggbyte_buffer page;
|
|
long bytes,ret=0;
|
|
|
|
ogg_page_release(og);
|
|
|
|
bytes=oy->fifo_fill;
|
|
oggbyte_init(&page,oy->fifo_tail);
|
|
|
|
if(oy->headerbytes==0){
|
|
if(bytes<27)goto sync_out; /* not enough for even a minimal header */
|
|
|
|
/* verify capture pattern */
|
|
if(oggbyte_read1(&page,0)!=(int)'O' ||
|
|
oggbyte_read1(&page,1)!=(int)'g' ||
|
|
oggbyte_read1(&page,2)!=(int)'g' ||
|
|
oggbyte_read1(&page,3)!=(int)'S' ) goto sync_fail;
|
|
|
|
oy->headerbytes=oggbyte_read1(&page,26)+27;
|
|
}
|
|
if(bytes<oy->headerbytes)goto sync_out; /* not enough for header +
|
|
seg table */
|
|
if(oy->bodybytes==0){
|
|
int i;
|
|
/* count up body length in the segment table */
|
|
for(i=0;i<oy->headerbytes-27;i++)
|
|
oy->bodybytes+=oggbyte_read1(&page,27+i);
|
|
}
|
|
|
|
if(oy->bodybytes+oy->headerbytes>bytes)goto sync_out;
|
|
|
|
/* we have what appears to be a complete page; last test: verify
|
|
checksum */
|
|
{
|
|
ogg_uint32_t chksum=oggbyte_read4(&page,22);
|
|
oggbyte_set4(&page,0,22);
|
|
|
|
/* Compare checksums; memory continues to be common access */
|
|
if(chksum!=_checksum(oy->fifo_tail,oy->bodybytes+oy->headerbytes)){
|
|
|
|
/* D'oh. Mismatch! Corrupt page (or miscapture and not a page
|
|
at all). replace the computed checksum with the one actually
|
|
read in; remember all the memory is common access */
|
|
|
|
oggbyte_set4(&page,chksum,22);
|
|
goto sync_fail;
|
|
}
|
|
oggbyte_set4(&page,chksum,22);
|
|
}
|
|
|
|
/* We have a page. Set up page return. */
|
|
if(og){
|
|
/* set up page output */
|
|
og->header=ogg_buffer_split(&oy->fifo_tail,&oy->fifo_head,oy->headerbytes);
|
|
og->header_len=oy->headerbytes;
|
|
og->body=ogg_buffer_split(&oy->fifo_tail,&oy->fifo_head,oy->bodybytes);
|
|
og->body_len=oy->bodybytes;
|
|
}else{
|
|
/* simply advance */
|
|
oy->fifo_tail=
|
|
ogg_buffer_pretruncate(oy->fifo_tail,oy->headerbytes+oy->bodybytes);
|
|
if(!oy->fifo_tail)oy->fifo_head=0;
|
|
}
|
|
|
|
ret=oy->headerbytes+oy->bodybytes;
|
|
oy->unsynced=0;
|
|
oy->headerbytes=0;
|
|
oy->bodybytes=0;
|
|
oy->fifo_fill-=ret;
|
|
|
|
return ret;
|
|
|
|
sync_fail:
|
|
|
|
oy->headerbytes=0;
|
|
oy->bodybytes=0;
|
|
oy->fifo_tail=ogg_buffer_pretruncate(oy->fifo_tail,1);
|
|
ret--;
|
|
|
|
/* search forward through fragments for possible capture */
|
|
while(oy->fifo_tail){
|
|
/* invariant: fifo_cursor points to a position in fifo_tail */
|
|
unsigned char *now=oy->fifo_tail->buffer->data+oy->fifo_tail->begin;
|
|
unsigned char *next=memchr(now, 'O', oy->fifo_tail->length);
|
|
|
|
if(next){
|
|
/* possible capture in this segment */
|
|
long bytes=next-now;
|
|
oy->fifo_tail=ogg_buffer_pretruncate(oy->fifo_tail,bytes);
|
|
ret-=bytes;
|
|
break;
|
|
}else{
|
|
/* no capture. advance to next segment */
|
|
long bytes=oy->fifo_tail->length;
|
|
ret-=bytes;
|
|
oy->fifo_tail=ogg_buffer_pretruncate(oy->fifo_tail,bytes);
|
|
}
|
|
}
|
|
if(!oy->fifo_tail)oy->fifo_head=0;
|
|
oy->fifo_fill+=ret;
|
|
|
|
sync_out:
|
|
return ret;
|
|
}
|
|
|
|
/* sync the stream and get a page. Keep trying until we find a page.
|
|
Supress 'sync errors' after reporting the first.
|
|
|
|
return values:
|
|
OGG_HOLE) recapture (hole in data)
|
|
0) need more data
|
|
1) page returned
|
|
|
|
Returns pointers into buffered data; invalidated by next call to
|
|
_stream, _clear, _init, or _buffer */
|
|
|
|
int ogg_sync_pageout(ogg_sync_state *oy, ogg_page *og){
|
|
|
|
/* all we need to do is verify a page at the head of the stream
|
|
buffer. If it doesn't verify, we look for the next potential
|
|
frame */
|
|
|
|
while(1){
|
|
long ret=ogg_sync_pageseek(oy,og);
|
|
if(ret>0){
|
|
/* have a page */
|
|
return 1;
|
|
}
|
|
if(ret==0){
|
|
/* need more data */
|
|
return 0;
|
|
}
|
|
|
|
/* head did not start a synced page... skipped some bytes */
|
|
if(!oy->unsynced){
|
|
oy->unsynced=1;
|
|
return OGG_HOLE;
|
|
}
|
|
|
|
/* loop. keep looking */
|
|
|
|
}
|
|
}
|
|
|
|
/* clear things to an initial state. Good to call, eg, before seeking */
|
|
int ogg_sync_reset(ogg_sync_state *oy){
|
|
|
|
ogg_buffer_release(oy->fifo_tail);
|
|
oy->fifo_tail=0;
|
|
oy->fifo_head=0;
|
|
oy->fifo_fill=0;
|
|
|
|
oy->unsynced=0;
|
|
oy->headerbytes=0;
|
|
oy->bodybytes=0;
|
|
return OGG_SUCCESS;
|
|
}
|
|
|
|
ogg_stream_state *ogg_stream_create(int serialno){
|
|
ogg_stream_state *os=_ogg_calloc(1,sizeof(*os));
|
|
os->serialno=serialno;
|
|
os->pageno=-1;
|
|
return os;
|
|
}
|
|
|
|
int ogg_stream_destroy(ogg_stream_state *os){
|
|
if(os){
|
|
ogg_buffer_release(os->header_tail);
|
|
ogg_buffer_release(os->body_tail);
|
|
memset(os,0,sizeof(*os));
|
|
}
|
|
return OGG_SUCCESS;
|
|
}
|
|
|
|
|
|
#define FINFLAG 0x80000000UL
|
|
#define FINMASK 0x7fffffffUL
|
|
|
|
static void _next_lace(oggbyte_buffer *ob,ogg_stream_state *os){
|
|
/* search ahead one lace */
|
|
os->body_fill_next=0;
|
|
while(os->laceptr<os->lacing_fill){
|
|
int val=oggbyte_read1(ob,27+os->laceptr++);
|
|
os->body_fill_next+=val;
|
|
if(val<255){
|
|
os->body_fill_next|=FINFLAG;
|
|
os->clearflag=1;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void _span_queued_page(ogg_stream_state *os){
|
|
while( !(os->body_fill&FINFLAG) ){
|
|
|
|
if(!os->header_tail)break;
|
|
|
|
/* first flush out preceeding page header (if any). Body is
|
|
flushed as it's consumed, so that's not done here. */
|
|
|
|
if(os->lacing_fill>=0)
|
|
os->header_tail=ogg_buffer_pretruncate(os->header_tail,
|
|
os->lacing_fill+27);
|
|
os->lacing_fill=0;
|
|
os->laceptr=0;
|
|
os->clearflag=0;
|
|
|
|
if(!os->header_tail){
|
|
os->header_head=0;
|
|
break;
|
|
}else{
|
|
|
|
/* process/prepare next page, if any */
|
|
|
|
long pageno;
|
|
oggbyte_buffer ob;
|
|
ogg_page og; /* only for parsing header values */
|
|
og.header=os->header_tail; /* only for parsing header values */
|
|
pageno=ogg_page_pageno(&og);
|
|
|
|
oggbyte_init(&ob,os->header_tail);
|
|
os->lacing_fill=oggbyte_read1(&ob,26);
|
|
|
|
/* are we in sequence? */
|
|
if(pageno!=os->pageno){
|
|
if(os->pageno==-1) /* indicates seek or reset */
|
|
os->holeflag=1; /* set for internal use */
|
|
else
|
|
os->holeflag=2; /* set for external reporting */
|
|
|
|
os->body_tail=ogg_buffer_pretruncate(os->body_tail,
|
|
os->body_fill);
|
|
if(os->body_tail==0)os->body_head=0;
|
|
os->body_fill=0;
|
|
|
|
}
|
|
|
|
if(ogg_page_continued(&og)){
|
|
if(os->body_fill==0){
|
|
/* continued packet, but no preceeding data to continue */
|
|
/* dump the first partial packet on the page */
|
|
_next_lace(&ob,os);
|
|
os->body_tail=
|
|
ogg_buffer_pretruncate(os->body_tail,os->body_fill_next&FINMASK);
|
|
if(os->body_tail==0)os->body_head=0;
|
|
/* set span flag */
|
|
if(!os->spanflag && !os->holeflag)os->spanflag=2;
|
|
}
|
|
}else{
|
|
if(os->body_fill>0){
|
|
/* preceeding data to continue, but not a continued page */
|
|
/* dump body_fill */
|
|
os->body_tail=ogg_buffer_pretruncate(os->body_tail,
|
|
os->body_fill);
|
|
if(os->body_tail==0)os->body_head=0;
|
|
os->body_fill=0;
|
|
|
|
/* set espan flag */
|
|
if(!os->spanflag && !os->holeflag)os->spanflag=2;
|
|
}
|
|
}
|
|
|
|
if(os->laceptr<os->lacing_fill){
|
|
os->granulepos=ogg_page_granulepos(&og);
|
|
|
|
/* get current packet size & flag */
|
|
_next_lace(&ob,os);
|
|
os->body_fill+=os->body_fill_next; /* addition handles the flag fine;
|
|
unsigned on purpose */
|
|
/* ...and next packet size & flag */
|
|
_next_lace(&ob,os);
|
|
|
|
}
|
|
|
|
os->pageno=pageno+1;
|
|
os->e_o_s=ogg_page_eos(&og);
|
|
os->b_o_s=ogg_page_bos(&og);
|
|
|
|
}
|
|
}
|
|
}
|
|
|
|
/* add the incoming page to the stream state; we decompose the page
|
|
into packet segments here as well. */
|
|
|
|
int ogg_stream_pagein(ogg_stream_state *os, ogg_page *og){
|
|
|
|
int serialno=ogg_page_serialno(og);
|
|
int version=ogg_page_version(og);
|
|
|
|
/* check the serial number */
|
|
if(serialno!=os->serialno){
|
|
ogg_page_release(og);
|
|
return OGG_ESERIAL;
|
|
}
|
|
if(version>0){
|
|
ogg_page_release(og);
|
|
return OGG_EVERSION;
|
|
}
|
|
|
|
/* add to fifos */
|
|
if(!os->body_tail){
|
|
os->body_tail=og->body;
|
|
os->body_head=ogg_buffer_walk(og->body);
|
|
}else{
|
|
os->body_head=ogg_buffer_cat(os->body_head,og->body);
|
|
}
|
|
if(!os->header_tail){
|
|
os->header_tail=og->header;
|
|
os->header_head=ogg_buffer_walk(og->header);
|
|
os->lacing_fill=-27;
|
|
}else{
|
|
os->header_head=ogg_buffer_cat(os->header_head,og->header);
|
|
}
|
|
|
|
memset(og,0,sizeof(*og));
|
|
return OGG_SUCCESS;
|
|
}
|
|
|
|
int ogg_stream_reset(ogg_stream_state *os){
|
|
|
|
ogg_buffer_release(os->header_tail);
|
|
ogg_buffer_release(os->body_tail);
|
|
os->header_tail=os->header_head=0;
|
|
os->body_tail=os->body_head=0;
|
|
|
|
os->e_o_s=0;
|
|
os->b_o_s=0;
|
|
os->pageno=-1;
|
|
os->packetno=0;
|
|
os->granulepos=0;
|
|
|
|
os->body_fill=0;
|
|
os->lacing_fill=0;
|
|
|
|
os->holeflag=0;
|
|
os->spanflag=0;
|
|
os->clearflag=0;
|
|
os->laceptr=0;
|
|
os->body_fill_next=0;
|
|
|
|
return OGG_SUCCESS;
|
|
}
|
|
|
|
int ogg_stream_reset_serialno(ogg_stream_state *os,int serialno){
|
|
ogg_stream_reset(os);
|
|
os->serialno=serialno;
|
|
return OGG_SUCCESS;
|
|
}
|
|
|
|
static int _packetout(ogg_stream_state *os,ogg_packet *op,int adv){
|
|
|
|
ogg_packet_release(op);
|
|
_span_queued_page(os);
|
|
|
|
if(os->holeflag){
|
|
int temp=os->holeflag;
|
|
if(os->clearflag)
|
|
os->holeflag=0;
|
|
else
|
|
os->holeflag=1;
|
|
if(temp==2){
|
|
os->packetno++;
|
|
return OGG_HOLE;
|
|
}
|
|
}
|
|
if(os->spanflag){
|
|
int temp=os->spanflag;
|
|
if(os->clearflag)
|
|
os->spanflag=0;
|
|
else
|
|
os->spanflag=1;
|
|
if(temp==2){
|
|
os->packetno++;
|
|
return OGG_SPAN;
|
|
}
|
|
}
|
|
|
|
if(!(os->body_fill&FINFLAG)) return 0;
|
|
if(!op && !adv)return 1; /* just using peek as an inexpensive way
|
|
to ask if there's a whole packet
|
|
waiting */
|
|
if(op){
|
|
op->b_o_s=os->b_o_s;
|
|
if(os->e_o_s && os->body_fill_next==0)
|
|
op->e_o_s=os->e_o_s;
|
|
else
|
|
op->e_o_s=0;
|
|
if( (os->body_fill&FINFLAG) && !(os->body_fill_next&FINFLAG) )
|
|
op->granulepos=os->granulepos;
|
|
else
|
|
op->granulepos=-1;
|
|
op->packetno=os->packetno;
|
|
}
|
|
|
|
if(adv){
|
|
oggbyte_buffer ob;
|
|
oggbyte_init(&ob,os->header_tail);
|
|
|
|
/* split the body contents off */
|
|
if(op){
|
|
op->packet=ogg_buffer_split(&os->body_tail,&os->body_head,
|
|
os->body_fill&FINMASK);
|
|
op->bytes=os->body_fill&FINMASK;
|
|
}else{
|
|
os->body_tail=ogg_buffer_pretruncate(os->body_tail,
|
|
os->body_fill&FINMASK);
|
|
if(os->body_tail==0)os->body_head=0;
|
|
}
|
|
|
|
/* update lacing pointers */
|
|
os->body_fill=os->body_fill_next;
|
|
_next_lace(&ob,os);
|
|
}else{
|
|
if(op){
|
|
op->packet=ogg_buffer_sub(os->body_tail,0,os->body_fill&FINMASK);
|
|
op->bytes=os->body_fill&FINMASK;
|
|
}
|
|
}
|
|
|
|
if(adv){
|
|
os->packetno++;
|
|
os->b_o_s=0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
int ogg_stream_packetout(ogg_stream_state *os,ogg_packet *op){
|
|
return _packetout(os,op,1);
|
|
}
|
|
|
|
int ogg_stream_packetpeek(ogg_stream_state *os,ogg_packet *op){
|
|
return _packetout(os,op,0);
|
|
}
|
|
|
|
int ogg_packet_release(ogg_packet *op) {
|
|
if(op){
|
|
ogg_buffer_release(op->packet);
|
|
memset(op, 0, sizeof(*op));
|
|
}
|
|
return OGG_SUCCESS;
|
|
}
|
|
|
|
int ogg_page_release(ogg_page *og) {
|
|
if(og){
|
|
ogg_buffer_release(og->header);
|
|
ogg_buffer_release(og->body);
|
|
memset(og, 0, sizeof(*og));
|
|
}
|
|
return OGG_SUCCESS;
|
|
}
|
|
|
|
void ogg_page_dup(ogg_page *dup,ogg_page *orig){
|
|
dup->header_len=orig->header_len;
|
|
dup->body_len=orig->body_len;
|
|
dup->header=ogg_buffer_dup(orig->header);
|
|
dup->body=ogg_buffer_dup(orig->body);
|
|
}
|
|
|