#include <ctype.h>
#include <string.h>
+#include "graphparser.h"
#include "avfilter.h"
#include "avfiltergraph.h"
-static AVFilterContext *create_filter(AVFilterGraph *ctx, int index,
- const char *name, const char *args,
- AVClass *log_ctx)
-{
- AVFilterContext *filt;
-
- AVFilter *filterdef;
- char inst_name[30];
-
- snprintf(inst_name, sizeof(inst_name), "Parsed filter %d", index);
-
- if(!(filterdef = avfilter_get_by_name(name))) {
- av_log(log_ctx, AV_LOG_ERROR,
- "no such filter: '%s'\n", name);
- return NULL;
- }
-
- if(!(filt = avfilter_open(filterdef, inst_name))) {
- av_log(log_ctx, AV_LOG_ERROR,
- "error creating filter '%s'\n", name);
- return NULL;
- }
-
- if(avfilter_graph_add_filter(ctx, filt) < 0)
- return NULL;
-
- if(avfilter_init_filter(filt, args, NULL)) {
- av_log(log_ctx, AV_LOG_ERROR,
- "error initializing filter '%s' with args '%s'\n", name, args);
- return NULL;
- }
-
- return filt;
-}
-
static int link_filter(AVFilterContext *src, int srcpad,
AVFilterContext *dst, int dstpad,
AVClass *log_ctx)
return 0;
}
-static void consume_whitespace(const char **buf)
+static int consume_whitespace(const char *buf)
{
- *buf += strspn(*buf, " \n\t");
+ return strspn(buf, " \n\t");
}
/**
char *out = av_malloc(strlen(*buf) + 1);
char *ret = out;
- consume_whitespace(buf);
+ *buf += consume_whitespace(*buf);
do{
char c = *(*buf)++;
switch (c) {
case '\\':
- *out++= *(*buf)++;
+ *out++ = *(*buf)++;
break;
case '\'':
while(**buf && **buf != '\'')
- *out++= *(*buf)++;
+ *out++ = *(*buf)++;
if(**buf) (*buf)++;
break;
case 0:
case ';':
case ' ':
case '\n':
- *out++= 0;
+ *out++ = 0;
break;
default:
- *out++= c;
+ *out++ = c;
}
} while(out[-1]);
(*buf)--;
- consume_whitespace(buf);
+ *buf += consume_whitespace(*buf);
return ret;
}
/**
* Parse "[linkname]"
- * @arg name a pointer (that need to be free'd after use) to the name between
- * parenthesis
+ * @param 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, AVClass *log_ctx)
+static char *parse_link_name(const char **buf, AVClass *log_ctx)
{
const char *start = *buf;
+ char *name;
(*buf)++;
- *name = consume_string(buf);
+ name = consume_string(buf);
- if(!*name[0]) {
+ if(!name[0]) {
av_log(log_ctx, AV_LOG_ERROR,
"Bad (empty?) label found in the following: \"%s\".\n", start);
goto fail;
av_log(log_ctx, AV_LOG_ERROR,
"Mismatched '[' found in the following: \"%s\".\n", start);
fail:
- av_freep(name);
+ av_freep(&name);
}
+
+ return name;
}
+static AVFilterContext *create_filter(AVFilterGraph *ctx, int index,
+ const char *name, const char *args,
+ AVClass *log_ctx)
+{
+ AVFilterContext *filt;
+
+ AVFilter *filterdef;
+ char inst_name[30];
+
+ snprintf(inst_name, sizeof(inst_name), "Parsed filter %d", index);
+
+ filterdef = avfilter_get_by_name(name);
+
+ if(!filterdef) {
+ av_log(log_ctx, AV_LOG_ERROR,
+ "no such filter: '%s'\n", name);
+ return NULL;
+ }
+
+ filt = avfilter_open(filterdef, inst_name);
+ if(!filt) {
+ av_log(log_ctx, AV_LOG_ERROR,
+ "error creating filter '%s'\n", name);
+ return NULL;
+ }
+
+ if(avfilter_graph_add_filter(ctx, filt) < 0) {
+ avfilter_destroy(filt);
+ return NULL;
+ }
+
+ if(avfilter_init_filter(filt, args, NULL)) {
+ av_log(log_ctx, AV_LOG_ERROR,
+ "error initializing filter '%s' with args '%s'\n", name, args);
+ return NULL;
+ }
-enum LinkType {
- LinkTypeIn,
- LinkTypeOut,
-};
+ return filt;
+}
/**
- * A linked-list of the inputs/outputs of the filter chain.
+ * Parse "filter=params"
*/
-typedef struct AVFilterInOut {
- enum LinkType type;
- const char *name;
- AVFilterContext *filter;
- int pad_idx;
+static AVFilterContext *parse_filter(const char **buf, AVFilterGraph *graph,
+ int index, AVClass *log_ctx)
+{
+ char *opts = NULL;
+ char *name = consume_string(buf);
+ AVFilterContext *ret;
- struct AVFilterInOut *next;
-} AVFilterInOut;
+ if(**buf == '=') {
+ (*buf)++;
+ opts = consume_string(buf);
+ }
+
+ ret = create_filter(graph, index, name, opts, log_ctx);
+ av_free(name);
+ av_free(opts);
+ return ret;
+}
static void free_inout(AVFilterInOut *head)
{
- while (head) {
+ while(head) {
AVFilterInOut *next = head->next;
+ av_free(head->name);
av_free(head);
head = next;
}
{
AVFilterInOut *ret;
-
while(*links && strcmp((*links)->name, label))
links = &((*links)->next);
return ret;
}
+static void insert_inout(AVFilterInOut **inouts, AVFilterInOut *element)
+{
+ element->next = *inouts;
+ *inouts = element;
+}
static int link_filter_inouts(AVFilterContext *filter,
AVFilterInOut **currInputs,
- AVFilterInOut **openLinks, AVClass *log_ctx)
+ AVFilterInOut **openInputs, AVClass *log_ctx)
{
- AVFilterInOut *p;
- int pad = 0;
+ int pad = filter->input_count;
- pad = filter->input_count;
while(pad--) {
- p = *currInputs;
+ AVFilterInOut *p = *currInputs;
if(!p) {
av_log(log_ctx, AV_LOG_ERROR,
"Not enough inputs specified for the \"%s\" filter.\n",
- filter->name);
+ filter->filter->name);
return -1;
}
+ *currInputs = (*currInputs)->next;
+
if(p->filter) {
if(link_filter(p->filter, p->pad_idx, filter, pad, log_ctx))
return -1;
- *currInputs = (*currInputs)->next;
+ av_free(p->name);
av_free(p);
} else {
- *currInputs = (*currInputs)->next;
p->filter = filter;
p->pad_idx = pad;
- p->next = *openLinks;
- *openLinks = p;
+ insert_inout(openInputs, p);
}
}
-
if(*currInputs) {
av_log(log_ctx, AV_LOG_ERROR,
"Too many inputs specified for the \"%s\" filter.\n",
- filter->name);
+ filter->filter->name);
return -1;
}
pad = filter->output_count;
while(pad--) {
- AVFilterInOut *currlinkn = av_malloc(sizeof(AVFilterInOut));
- currlinkn->name = NULL;
- currlinkn->type = LinkTypeOut;
+ AVFilterInOut *currlinkn = av_mallocz(sizeof(AVFilterInOut));
currlinkn->filter = filter;
currlinkn->pad_idx = pad;
- currlinkn->next = *currInputs;
- *currInputs = currlinkn;
+ insert_inout(currInputs, currlinkn);
}
return 0;
}
-/**
- * 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 AVFilterContext *parse_filter(const char **buf, AVFilterGraph *graph,
- int index, AVClass *log_ctx)
-{
- char *opts;
- char *name = consume_string(buf);
-
- if(**buf == '=') {
- (*buf)++;
- opts = consume_string(buf);
- } else {
- opts = NULL;
- }
-
- return create_filter(graph, index, name, opts, log_ctx);
-}
-
static int parse_inputs(const char **buf, AVFilterInOut **currInputs,
- AVFilterInOut **openLinks, AVClass *log_ctx)
+ AVFilterInOut **openOutputs, AVClass *log_ctx)
{
int pad = 0;
- while (**buf == '[') {
- char *name;
- AVFilterInOut *link_to_add;
+ while(**buf == '[') {
+ char *name = parse_link_name(buf, log_ctx);
AVFilterInOut *match;
- parse_link_name(buf, &name, log_ctx);
-
if(!name)
return -1;
- /* First check if the label is not in the openLinks list */
- match = extract_inout(name, openLinks);
+ /* First check if the label is not in the openOutputs list */
+ match = extract_inout(name, openOutputs);
if(match) {
- /* A label of a open link. Make it one of the inputs of the next
- filter */
- if (match->type != LinkTypeOut) {
- av_log(log_ctx, AV_LOG_ERROR,
- "Label \"%s\" appears twice as input!\n", match->name);
- return -1;
- }
-
- link_to_add = match;
+ av_free(name);
} else {
/* Not in the list, so add it as an input */
- link_to_add = av_malloc(sizeof(AVFilterInOut));
-
- link_to_add->name = name;
- link_to_add->type = LinkTypeIn;
- link_to_add->filter = NULL;
- link_to_add->pad_idx = pad;
+ match = av_mallocz(sizeof(AVFilterInOut));
+ match->name = name;
+ match->pad_idx = pad;
}
- link_to_add->next = *currInputs;
- *currInputs = link_to_add;
- consume_whitespace(buf);
+
+ insert_inout(currInputs, match);
+
+ *buf += consume_whitespace(*buf);
pad++;
}
}
static int parse_outputs(const char **buf, AVFilterInOut **currInputs,
- AVFilterInOut **openLinks, AVClass *log_ctx)
+ AVFilterInOut **openInputs,
+ AVFilterInOut **openOutputs, AVClass *log_ctx)
{
int pad = 0;
- while (**buf == '[') {
- char *name;
+ while(**buf == '[') {
+ char *name = parse_link_name(buf, log_ctx);
AVFilterInOut *match;
AVFilterInOut *input = *currInputs;
*currInputs = (*currInputs)->next;
- parse_link_name(buf, &name, log_ctx);
-
if(!name)
return -1;
- /* First check if the label is not in the openLinks list */
- match = extract_inout(name, openLinks);
+ /* First check if the label is not in the openInputs list */
+ match = extract_inout(name, openInputs);
if(match) {
- /* A label of a open link. Link it. */
- if (match->type != LinkTypeIn) {
- av_log(log_ctx, AV_LOG_ERROR,
- "Label \"%s\" appears twice as output!\n", match->name);
- return -1;
- }
-
if(link_filter(input->filter, input->pad_idx,
match->filter, match->pad_idx, log_ctx) < 0)
return -1;
+ av_free(match->name);
+ av_free(name);
av_free(match);
av_free(input);
} else {
- /* Not in the list, so add the first input as a openLink */
- input->next = *openLinks;
- input->type = LinkTypeOut;
+ /* Not in the list, so add the first input as a openOutput */
input->name = name;
- *openLinks = input;
+ insert_inout(openOutputs, input);
}
- consume_whitespace(buf);
+ *buf += consume_whitespace(*buf);
pad++;
}
return pad;
}
-/**
- * Parse a string describing a filter graph.
- */
int avfilter_parse_graph(AVFilterGraph *graph, const char *filters,
- AVFilterContext *in, int inpad,
- AVFilterContext *out, int outpad,
- AVClass *log_ctx)
+ AVFilterInOut *openInputs,
+ AVFilterInOut *openOutputs, AVClass *log_ctx)
{
int index = 0;
char chr = 0;
- int pad = 0;
-
- AVFilterInOut *currInputs=NULL;
- AVFilterInOut *openLinks = av_malloc(sizeof(AVFilterInOut));
-
- openLinks->name = "in";
- openLinks->filter = in;
- openLinks->type = LinkTypeOut;
- openLinks->pad_idx = inpad;
- openLinks->next = av_malloc(sizeof(AVFilterInOut));
- openLinks->next->name = "out";
- openLinks->next->filter = out;
- openLinks->next->type = LinkTypeIn;
- openLinks->next->pad_idx = outpad;
- openLinks->next->next = NULL;
+ AVFilterInOut *currInputs = NULL;
do {
AVFilterContext *filter;
- consume_whitespace(&filters);
+ filters += consume_whitespace(filters);
- pad = parse_inputs(&filters, &currInputs, &openLinks, log_ctx);
-
- if(pad < 0)
+ if(parse_inputs(&filters, &currInputs, &openOutputs, log_ctx) < 0)
goto fail;
- if(!(filter = parse_filter(&filters, graph, index, log_ctx)))
+ filter = parse_filter(&filters, graph, index, log_ctx);
+
+ if(!filter)
goto fail;
if(filter->input_count == 1 && !currInputs && !index) {
- // First input can be ommitted if it is "[in]"
+ /* First input can be ommitted if it is "[in]" */
const char *tmp = "[in]";
- pad = parse_inputs(&tmp, &currInputs, &openLinks, log_ctx);
- if (pad < 0)
+ if(parse_inputs(&tmp, &currInputs, &openOutputs, log_ctx) < 0)
goto fail;
}
- if(link_filter_inouts(filter, &currInputs, &openLinks, log_ctx) < 0)
+ if(link_filter_inouts(filter, &currInputs, &openInputs, log_ctx) < 0)
goto fail;
- pad = parse_outputs(&filters, &currInputs, &openLinks, log_ctx);
-
- if(pad < 0)
+ if(parse_outputs(&filters, &currInputs, &openInputs, &openOutputs,
+ log_ctx) < 0)
goto fail;
- consume_whitespace(&filters);
+ filters += consume_whitespace(filters);
chr = *filters++;
- if (chr == ';' && currInputs) {
+ if(chr == ';' && currInputs) {
av_log(log_ctx, AV_LOG_ERROR,
"Could not find a output to link when parsing \"%s\"\n",
filters - 1);
goto fail;
}
index++;
- } while (chr == ',' || chr == ';');
+ } while(chr == ',' || chr == ';');
- if(openLinks && !strcmp(openLinks->name, "out") && currInputs) {
- // Last output can be ommitted if it is "[out]"
+ if(openInputs && !strcmp(openInputs->name, "out") && currInputs) {
+ /* Last output can be ommitted if it is "[out]" */
const char *tmp = "[out]";
- if(parse_outputs(&tmp, &currInputs, &openLinks, log_ctx) < 0)
+ if(parse_outputs(&tmp, &currInputs, &openInputs,
+ &openOutputs, log_ctx) < 0)
goto fail;
}
fail:
avfilter_destroy_graph(graph);
- free_inout(openLinks);
+ free_inout(openInputs);
+ free_inout(openOutputs);
free_inout(currInputs);
return -1;
}
projects / ffmpeg / blobdiff