mirror of https://git.ffmpeg.org/ffmpeg.git
Merge avfiltergraphdesc.c in avfiltergraph.c
Commited in SoC by Vitor Sessak on 2008-03-24 20:46:50 Originally committed as revision 12735 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Vitor Sessak
parent
f2ee8083c8
commit
5c2ff9fd46
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@ -1,5 +1,6 @@
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/*
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* filter graphs
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* copyright (c) 2008 Vitor Sessak
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* copyright (c) 2007 Bobby Bingham
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*
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* This file is part of FFmpeg.
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@ -19,6 +20,9 @@
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <ctype.h>
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#include <string.h>
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#include "avfilter.h"
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#include "avfiltergraph.h"
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@ -249,3 +253,337 @@ fail:
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uninit(graph);
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return -1;
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}
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static void consume_whitespace(const char **buf)
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{
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*buf += strspn(*buf, " \n\t");
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}
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/**
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* get the next non-whitespace char
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*/
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static char consume_char(const char **buf)
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{
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char out;
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consume_whitespace(buf);
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out = **buf;
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if (out)
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(*buf)++;
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return out;
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}
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/**
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* remove the quotation marks from a string. Ex: "aaa'bb'cc" -> "aaabbcc"
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*/
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static void unquote(char *str)
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{
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char *p1, *p2;
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p1=p2=str;
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while (*p1 != 0) {
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if (*p1 != '\'')
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*p2++ = *p1;
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p1++;
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}
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*p2 = 0;
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}
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/**
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* Consumes a string from *buf.
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* @return a copy of the consumed string, which should be free'd after use
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*/
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static char *consume_string(const char **buf)
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{
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const char *start;
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char *ret;
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int size;
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consume_whitespace(buf);
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if (!(**buf))
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return av_mallocz(1);
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start = *buf;
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*buf += strcspn(*buf, " ()=,'");
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if (**buf == '\'') {
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char *p = strchr(*buf + 1, '\'');
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if (p)
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*buf = p + 1;
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else
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*buf += strlen(*buf); // Move the pointer to the null end byte
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}
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size = *buf - start + 1;
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ret = av_malloc(size);
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memcpy(ret, start, size - 1);
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ret[size-1] = 0;
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unquote(ret);
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return ret;
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}
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/**
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* Parse "(linkname)"
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* @arg name a pointer (that need to be free'd after use) to the name between
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* parenthesis
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*/
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static void parse_link_name(const char **buf, char **name)
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{
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consume_char(buf);
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*name = consume_string(buf);
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if (!*name[0])
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goto fail;
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if (consume_char(buf) != ')')
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goto fail;
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return;
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fail:
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av_freep(name);
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av_log(&log_ctx, AV_LOG_ERROR, "Could not parse link name!\n");
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}
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/**
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* Parse "filter=params"
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* @arg name a pointer (that need to be free'd after use) to the name of the
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* filter
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* @arg ars a pointer (that need to be free'd after use) to the args of the
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* filter
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*/
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static void parse_filter(const char **buf, char **name, char **opts)
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{
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*name = consume_string(buf);
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if (**buf == '=') {
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consume_char(buf);
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*opts = consume_string(buf);
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} else {
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*opts = NULL;
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}
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}
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enum LinkType {
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LinkTypeIn,
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LinkTypeOut,
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};
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/**
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* A linked-list of the inputs/outputs of the filter chain.
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*/
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typedef struct AVFilterInOut {
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enum LinkType type;
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char *name;
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int instance;
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int pad_idx;
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struct AVFilterInOut *next;
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} AVFilterInOut;
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static void free_inout(AVFilterInOut *head)
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{
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while (head) {
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AVFilterInOut *next;
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next = head->next;
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av_free(head);
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head = next;
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}
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}
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/**
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* Parse "(a1)(link2) ... (etc)"
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*/
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static int parse_inouts(const char **buf, AVFilterInOut **inout, int firstpad,
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enum LinkType type, int instance)
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{
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int pad = firstpad;
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while (**buf == '(') {
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AVFilterInOut *inoutn = av_malloc(sizeof(AVFilterInOut));
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parse_link_name(buf, &inoutn->name);
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inoutn->type = type;
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inoutn->instance = instance;
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inoutn->pad_idx = pad++;
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inoutn->next = *inout;
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*inout = inoutn;
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}
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return pad;
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}
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static AVFilterGraphDesc *parse_chain(const char *filters, int has_in)
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{
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AVFilterGraphDesc *ret;
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AVFilterGraphDescFilter **filterp, *filtern;
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AVFilterGraphDescLink **linkp, *linkn;
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AVFilterInOut *inout=NULL;
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AVFilterInOut *head;
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int index = 0;
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char chr = 0;
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int pad = 0;
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int has_out = 0;
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consume_whitespace(&filters);
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if(!(ret = av_mallocz(sizeof(AVFilterGraphDesc))))
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return NULL;
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filterp = &ret->filters;
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linkp = &ret->links;
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do {
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if(chr == ',') {
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linkn = av_mallocz(sizeof(AVFilterGraphDescLink));
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linkn->src = index-1;
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linkn->srcpad = pad;
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linkn->dst = index;
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linkn->dstpad = 0;
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*linkp = linkn;
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linkp = &linkn->next;
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}
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pad = parse_inouts(&filters, &inout, chr == ',' || (!has_in),
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LinkTypeIn, index);
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filtern = av_mallocz(sizeof(AVFilterGraphDescFilter));
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filtern->index = index;
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parse_filter(&filters, &filtern->filter, &filtern->args);
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*filterp = filtern;
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filterp = &filtern->next;
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pad = parse_inouts(&filters, &inout, 0,
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LinkTypeOut, index);
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chr = consume_char(&filters);
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index++;
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} while (chr == ',' || chr == ';');
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head = inout;
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for (; inout != NULL; inout = inout->next) {
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if (inout->instance == -1)
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continue; // Already processed
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if (!strcmp(inout->name, "in")) {
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if (!has_in)
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goto fail;
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ret->inputs = av_mallocz(sizeof(AVFilterGraphDescExport));
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ret->inputs->filter = inout->instance;
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ret->inputs->pad = inout->pad_idx;
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} else if (!strcmp(inout->name, "out")) {
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has_out = 1;
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ret->outputs = av_mallocz(sizeof(AVFilterGraphDescExport));
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ret->outputs->filter = inout->instance;
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ret->outputs->pad = inout->pad_idx;
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} else {
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AVFilterInOut *p, *src, *dst;
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for (p = inout->next;
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p && strcmp(p->name,inout->name); p = p->next);
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if (!p) {
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av_log(&log_ctx, AV_LOG_ERROR, "Unmatched link: %s.\n",
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inout->name);
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goto fail;
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}
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if (p->type == LinkTypeIn && inout->type == LinkTypeOut) {
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src = inout;
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dst = p;
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} else if (p->type == LinkTypeOut && inout->type == LinkTypeIn) {
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src = p;
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dst = inout;
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} else {
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av_log(&log_ctx, AV_LOG_ERROR, "Two links named '%s' are either both input or both output\n",
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inout->name);
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goto fail;
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}
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linkn = av_mallocz(sizeof(AVFilterGraphDescLink));
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linkn->src = src->instance;
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linkn->srcpad = src->pad_idx;
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linkn->dst = dst->instance;
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linkn->dstpad = dst->pad_idx;
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*linkp = linkn;
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linkp = &linkn->next;
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src->instance = -1;
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dst->instance = -1;
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}
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}
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free_inout(head);
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if (!has_in) {
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ret->inputs = av_mallocz(sizeof(AVFilterGraphDescExport));
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ret->inputs->filter = 0;
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}
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if (!has_out) {
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ret->outputs = av_mallocz(sizeof(AVFilterGraphDescExport));
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ret->outputs->filter = index-1;
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}
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return ret;
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fail:
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free_inout(head);
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avfilter_graph_free_desc(ret);
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return NULL;
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}
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/**
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* Parse a string describing a filter graph.
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*/
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AVFilterGraphDesc *avfilter_graph_parse_chain(const char *filters)
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{
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AVFilterGraphDesc *ret;
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/* Try first to parse supposing there is no (in) element */
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if ((ret = parse_chain(filters, 0)))
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return ret;
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/* Parse supposing there is an (in) element */
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return parse_chain(filters, 1);
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}
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/**
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* Free a graph description.
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*/
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void avfilter_graph_free_desc(AVFilterGraphDesc *desc)
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{
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void *next;
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while(desc->filters) {
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next = desc->filters->next;
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av_free(desc->filters->filter);
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av_free(desc->filters->args);
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av_free(desc->filters);
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desc->filters = next;
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}
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while(desc->links) {
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next = desc->links->next;
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av_free(desc->links);
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desc->links = next;
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}
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while(desc->inputs) {
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next = desc->inputs->next;
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av_free(desc->inputs);
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desc->inputs = next;
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}
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while(desc->outputs) {
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next = desc->outputs->next;
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av_free(desc->outputs);
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desc->outputs = next;
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}
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}
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