Commit 5c2ff9fd authored by Vitor Sessak's avatar Vitor Sessak
Browse files

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
parent f2ee8083
/*
* filter graphs
* copyright (c) 2008 Vitor Sessak
* copyright (c) 2007 Bobby Bingham
*
* This file is part of FFmpeg.
......@@ -19,6 +20,9 @@
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <ctype.h>
#include <string.h>
#include "avfilter.h"
#include "avfiltergraph.h"
......@@ -249,3 +253,337 @@ fail:
uninit(graph);
return -1;
}
static void consume_whitespace(const char **buf)
{
*buf += strspn(*buf, " \n\t");
}
/**
* get the next non-whitespace char
*/
static char consume_char(const char **buf)
{
char out;
consume_whitespace(buf);
out = **buf;
if (out)
(*buf)++;
return out;
}
/**
* remove the quotation marks from a string. Ex: "aaa'bb'cc" -> "aaabbcc"
*/
static void unquote(char *str)
{
char *p1, *p2;
p1=p2=str;
while (*p1 != 0) {
if (*p1 != '\'')
*p2++ = *p1;
p1++;
}
*p2 = 0;
}
/**
* Consumes a string from *buf.
* @return a copy of the consumed string, which should be free'd after use
*/
static char *consume_string(const char **buf)
{
const char *start;
char *ret;
int size;
consume_whitespace(buf);
if (!(**buf))
return av_mallocz(1);
start = *buf;
*buf += strcspn(*buf, " ()=,'");
if (**buf == '\'') {
char *p = strchr(*buf + 1, '\'');
if (p)
*buf = p + 1;
else
*buf += strlen(*buf); // Move the pointer to the null end byte
}
size = *buf - start + 1;
ret = av_malloc(size);
memcpy(ret, start, size - 1);
ret[size-1] = 0;
unquote(ret);
return ret;
}
/**
* Parse "(linkname)"
* @arg name a pointer (that need to be free'd after use) to the name between
* parenthesis
*/
static void parse_link_name(const char **buf, char **name)
{
consume_char(buf);
*name = consume_string(buf);
if (!*name[0])
goto fail;
if (consume_char(buf) != ')')
goto fail;
return;
fail:
av_freep(name);
av_log(&log_ctx, AV_LOG_ERROR, "Could not parse link name!\n");
}
/**
* Parse "filter=params"
* @arg name a pointer (that need to be free'd after use) to the name of the
* filter
* @arg ars a pointer (that need to be free'd after use) to the args of the
* filter
*/
static void parse_filter(const char **buf, char **name, char **opts)
{
*name = consume_string(buf);
if (**buf == '=') {
consume_char(buf);
*opts = consume_string(buf);
} else {
*opts = NULL;
}
}
enum LinkType {
LinkTypeIn,
LinkTypeOut,
};
/**
* A linked-list of the inputs/outputs of the filter chain.
*/
typedef struct AVFilterInOut {
enum LinkType type;
char *name;
int instance;
int pad_idx;
struct AVFilterInOut *next;
} AVFilterInOut;
static void free_inout(AVFilterInOut *head)
{
while (head) {
AVFilterInOut *next;
next = head->next;
av_free(head);
head = next;
}
}
/**
* Parse "(a1)(link2) ... (etc)"
*/
static int parse_inouts(const char **buf, AVFilterInOut **inout, int firstpad,
enum LinkType type, int instance)
{
int pad = firstpad;
while (**buf == '(') {
AVFilterInOut *inoutn = av_malloc(sizeof(AVFilterInOut));
parse_link_name(buf, &inoutn->name);
inoutn->type = type;
inoutn->instance = instance;
inoutn->pad_idx = pad++;
inoutn->next = *inout;
*inout = inoutn;
}
return pad;
}
static AVFilterGraphDesc *parse_chain(const char *filters, int has_in)
{
AVFilterGraphDesc *ret;
AVFilterGraphDescFilter **filterp, *filtern;
AVFilterGraphDescLink **linkp, *linkn;
AVFilterInOut *inout=NULL;
AVFilterInOut *head;
int index = 0;
char chr = 0;
int pad = 0;
int has_out = 0;
consume_whitespace(&filters);
if(!(ret = av_mallocz(sizeof(AVFilterGraphDesc))))
return NULL;
filterp = &ret->filters;
linkp = &ret->links;
do {
if(chr == ',') {
linkn = av_mallocz(sizeof(AVFilterGraphDescLink));
linkn->src = index-1;
linkn->srcpad = pad;
linkn->dst = index;
linkn->dstpad = 0;
*linkp = linkn;
linkp = &linkn->next;
}
pad = parse_inouts(&filters, &inout, chr == ',' || (!has_in),
LinkTypeIn, index);
filtern = av_mallocz(sizeof(AVFilterGraphDescFilter));
filtern->index = index;
parse_filter(&filters, &filtern->filter, &filtern->args);
*filterp = filtern;
filterp = &filtern->next;
pad = parse_inouts(&filters, &inout, 0,
LinkTypeOut, index);
chr = consume_char(&filters);
index++;
} while (chr == ',' || chr == ';');
head = inout;
for (; inout != NULL; inout = inout->next) {
if (inout->instance == -1)
continue; // Already processed
if (!strcmp(inout->name, "in")) {
if (!has_in)
goto fail;
ret->inputs = av_mallocz(sizeof(AVFilterGraphDescExport));
ret->inputs->filter = inout->instance;
ret->inputs->pad = inout->pad_idx;
} else if (!strcmp(inout->name, "out")) {
has_out = 1;
ret->outputs = av_mallocz(sizeof(AVFilterGraphDescExport));
ret->outputs->filter = inout->instance;
ret->outputs->pad = inout->pad_idx;
} else {
AVFilterInOut *p, *src, *dst;
for (p = inout->next;
p && strcmp(p->name,inout->name); p = p->next);
if (!p) {
av_log(&log_ctx, AV_LOG_ERROR, "Unmatched link: %s.\n",
inout->name);
goto fail;
}
if (p->type == LinkTypeIn && inout->type == LinkTypeOut) {
src = inout;
dst = p;
} else if (p->type == LinkTypeOut && inout->type == LinkTypeIn) {
src = p;
dst = inout;
} else {
av_log(&log_ctx, AV_LOG_ERROR, "Two links named '%s' are either both input or both output\n",
inout->name);
goto fail;
}
linkn = av_mallocz(sizeof(AVFilterGraphDescLink));
linkn->src = src->instance;
linkn->srcpad = src->pad_idx;
linkn->dst = dst->instance;
linkn->dstpad = dst->pad_idx;
*linkp = linkn;
linkp = &linkn->next;
src->instance = -1;
dst->instance = -1;
}
}
free_inout(head);
if (!has_in) {
ret->inputs = av_mallocz(sizeof(AVFilterGraphDescExport));
ret->inputs->filter = 0;
}
if (!has_out) {
ret->outputs = av_mallocz(sizeof(AVFilterGraphDescExport));
ret->outputs->filter = index-1;
}
return ret;
fail:
free_inout(head);
avfilter_graph_free_desc(ret);
return NULL;
}
/**
* Parse a string describing a filter graph.
*/
AVFilterGraphDesc *avfilter_graph_parse_chain(const char *filters)
{
AVFilterGraphDesc *ret;
/* Try first to parse supposing there is no (in) element */
if ((ret = parse_chain(filters, 0)))
return ret;
/* Parse supposing there is an (in) element */
return parse_chain(filters, 1);
}
/**
* Free a graph description.
*/
void avfilter_graph_free_desc(AVFilterGraphDesc *desc)
{
void *next;
while(desc->filters) {
next = desc->filters->next;
av_free(desc->filters->filter);
av_free(desc->filters->args);
av_free(desc->filters);
desc->filters = next;
}
while(desc->links) {
next = desc->links->next;
av_free(desc->links);
desc->links = next;
}
while(desc->inputs) {
next = desc->inputs->next;
av_free(desc->inputs);
desc->inputs = next;
}
while(desc->outputs) {
next = desc->outputs->next;
av_free(desc->outputs);
desc->outputs = next;
}
}
Markdown is supported
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment