#include <ctype.h>
#include <string.h>
+#include "graphparser.h"
#include "avfilter.h"
#include "avfiltergraph.h"
-/**
- * For use in av_log
- */
-static const char *log_name(void *p)
-{
- return "Filter parser";
-}
-
-static const AVClass filter_parser_class = {
- "Filter parser",
- log_name
-};
-
-static const AVClass *log_ctx = &filter_parser_class;
-
-static AVFilterContext *create_filter(AVFilterGraph *ctx, int index,
- char *name, char *args)
-{
- 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)
+ AVFilterContext *dst, int dstpad,
+ AVClass *log_ctx)
{
if(avfilter_link(src, srcpad, dst, dstpad)) {
- av_log(&log_ctx, AV_LOG_ERROR,
+ av_log(log_ctx, AV_LOG_ERROR,
"cannot create the link %s:%d -> %s:%d\n",
src->filter->name, srcpad, dst->filter->name, dstpad);
return -1;
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");
}
/**
static char *consume_string(const char **buf)
{
char *out = av_malloc(strlen(*buf) + 1);
- const char *in = *buf;
char *ret = out;
- consume_whitespace(buf);
+ *buf += consume_whitespace(*buf);
do{
- char c = *in++;
+ char c = *(*buf)++;
switch (c) {
case '\\':
- *out++= *in++;
+ *out++ = *(*buf)++;
break;
case '\'':
- while(*in && *in != '\'')
- *out++= *in++;
- if(*in) in++;
+ while(**buf && **buf != '\'')
+ *out++ = *(*buf)++;
+ if(**buf) (*buf)++;
break;
case 0:
case ']':
case '[':
case '=':
case ',':
- *out++= 0;
+ case ';':
+ case ' ':
+ case '\n':
+ *out++ = 0;
break;
default:
- *out++= c;
+ *out++ = c;
}
} while(out[-1]);
- *buf = in-1;
+ (*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)
+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]) {
- av_log(&log_ctx, AV_LOG_ERROR,
+ if(!name[0]) {
+ av_log(log_ctx, AV_LOG_ERROR,
"Bad (empty?) label found in the following: \"%s\".\n", start);
goto fail;
}
if(*(*buf)++ != ']') {
- av_log(&log_ctx, AV_LOG_ERROR,
+ av_log(log_ctx, AV_LOG_ERROR,
"Mismatched '[' found in the following: \"%s\".\n", start);
- goto fail;
+ fail:
+ av_freep(&name);
}
- return;
+ return name;
+}
- fail:
- av_freep(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;
+ }
+
+ return filt;
}
/**
* 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)
+static AVFilterContext *parse_filter(const char **buf, AVFilterGraph *graph,
+ int index, AVClass *log_ctx)
{
- char *name, *opts;
- name = consume_string(buf);
+ char *opts = NULL;
+ char *name = consume_string(buf);
+ AVFilterContext *ret;
if(**buf == '=') {
(*buf)++;
opts = consume_string(buf);
- } else {
- opts = NULL;
}
- return create_filter(graph, index, name, opts);
+ ret = create_filter(graph, index, name, opts, log_ctx);
+ av_free(name);
+ av_free(opts);
+ return ret;
}
-enum LinkType {
- LinkTypeIn,
- LinkTypeOut,
-};
-
-/**
- * A linked-list of the inputs/outputs of the filter chain.
- */
-typedef struct AVFilterInOut {
- enum LinkType type;
- char *name;
- AVFilterContext *filter;
- int pad_idx;
-
- struct AVFilterInOut *next;
-} AVFilterInOut;
-
static void free_inout(AVFilterInOut *head)
{
- while (head) {
+ while(head) {
AVFilterInOut *next = head->next;
+ av_free(head->name);
av_free(head);
head = next;
}
}
-/**
- * Parse "[a1][link2] ... [etc]"
- */
-static int parse_inouts(const char **buf, AVFilterInOut **inout, int pad,
- enum LinkType type, AVFilterContext *filter)
+static AVFilterInOut *extract_inout(const char *label, AVFilterInOut **links)
+{
+ AVFilterInOut *ret;
+
+ while(*links && strcmp((*links)->name, label))
+ links = &((*links)->next);
+
+ ret = *links;
+
+ if(ret)
+ *links = ret->next;
+
+ return ret;
+}
+
+static void insert_inout(AVFilterInOut **inouts, AVFilterInOut *element)
{
- while (**buf == '[') {
- AVFilterInOut *inoutn = av_malloc(sizeof(AVFilterInOut));
- parse_link_name(buf, &inoutn->name);
+ element->next = *inouts;
+ *inouts = element;
+}
- if (!inoutn->name) {
- av_free(inoutn);
+static int link_filter_inouts(AVFilterContext *filter,
+ AVFilterInOut **currInputs,
+ AVFilterInOut **openInputs, AVClass *log_ctx)
+{
+ int pad = filter->input_count;
+
+ while(pad--) {
+ AVFilterInOut *p = *currInputs;
+ if(!p) {
+ av_log(log_ctx, AV_LOG_ERROR,
+ "Not enough inputs specified for the \"%s\" filter.\n",
+ filter->filter->name);
return -1;
}
- inoutn->type = type;
- inoutn->filter = filter;
- inoutn->pad_idx = pad++;
- inoutn->next = *inout;
- *inout = inoutn;
+ *currInputs = (*currInputs)->next;
+
+ if(p->filter) {
+ if(link_filter(p->filter, p->pad_idx, filter, pad, log_ctx))
+ return -1;
+ av_free(p->name);
+ av_free(p);
+ } else {
+ p->filter = filter;
+ p->pad_idx = pad;
+ insert_inout(openInputs, p);
+ }
}
- return pad;
+
+ if(*currInputs) {
+ av_log(log_ctx, AV_LOG_ERROR,
+ "Too many inputs specified for the \"%s\" filter.\n",
+ filter->filter->name);
+ return -1;
+ }
+
+ pad = filter->output_count;
+ while(pad--) {
+ AVFilterInOut *currlinkn = av_mallocz(sizeof(AVFilterInOut));
+ currlinkn->filter = filter;
+ currlinkn->pad_idx = pad;
+ insert_inout(currInputs, currlinkn);
+ }
+
+ return 0;
}
-static const char *skip_inouts(const char *buf)
+static int parse_inputs(const char **buf, AVFilterInOut **currInputs,
+ AVFilterInOut **openOutputs, AVClass *log_ctx)
{
- while (*buf == '[')
- buf += strcspn(buf, "]") + 1;
+ int pad = 0;
- return buf;
-}
+ while(**buf == '[') {
+ char *name = parse_link_name(buf, log_ctx);
+ AVFilterInOut *match;
+ if(!name)
+ return -1;
-/**
- * Parse a string describing a filter graph.
- */
-int avfilter_parse_graph(AVFilterGraph *graph, const char *filters,
- AVFilterContext *in, int inpad,
- AVFilterContext *out, int outpad)
-{
- AVFilterInOut *inout=NULL;
- AVFilterInOut *head=NULL;
+ /* First check if the label is not in the openOutputs list */
+ match = extract_inout(name, openOutputs);
- int index = 0;
- char chr = 0;
- int pad = 0;
- int has_out = 0;
+ if(match) {
+ av_free(name);
+ } else {
+ /* Not in the list, so add it as an input */
+ match = av_mallocz(sizeof(AVFilterInOut));
+ match->name = name;
+ match->pad_idx = pad;
+ }
- AVFilterContext *last_filt = NULL;
+ insert_inout(currInputs, match);
- consume_whitespace(&filters);
+ *buf += consume_whitespace(*buf);
+ pad++;
+ }
- do {
- AVFilterContext *filter;
- int oldpad = pad;
- const char *inouts = filters;
+ return pad;
+}
- // We need to parse the inputs of the filter after we create it, so
- // skip it by now
- filters = skip_inouts(filters);
+static int parse_outputs(const char **buf, AVFilterInOut **currInputs,
+ AVFilterInOut **openInputs,
+ AVFilterInOut **openOutputs, AVClass *log_ctx)
+{
+ int pad = 0;
- if(!(filter = parse_filter(&filters, graph, index)))
- goto fail;
+ while(**buf == '[') {
+ char *name = parse_link_name(buf, log_ctx);
+ AVFilterInOut *match;
- pad = parse_inouts(&inouts, &inout, chr == ',', LinkTypeIn, filter);
+ AVFilterInOut *input = *currInputs;
+ *currInputs = (*currInputs)->next;
- if(pad < 0)
- goto fail;
+ if(!name)
+ return -1;
- // If the first filter has an input and none was given, it is
- // implicitly the input of the whole graph.
- if(pad == 0 && filter->input_count == 1) {
- if(link_filter(in, inpad, filter, 0))
- goto fail;
+ /* First check if the label is not in the openInputs list */
+ match = extract_inout(name, openInputs);
+
+ if(match) {
+ 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 openOutput */
+ input->name = name;
+ insert_inout(openOutputs, input);
}
+ *buf += consume_whitespace(*buf);
+ pad++;
+ }
- if(chr == ',') {
- if(link_filter(last_filt, oldpad, filter, 0) < 0)
- goto fail;
- }
+ return pad;
+}
- pad = parse_inouts(&filters, &inout, 0, LinkTypeOut, filter);
- chr = *filters++;
- index++;
- last_filt = filter;
- } while (chr == ',' || chr == ';');
+int avfilter_parse_graph(AVFilterGraph *graph, const char *filters,
+ AVFilterInOut *openInputs,
+ AVFilterInOut *openOutputs, AVClass *log_ctx)
+{
+ int index = 0;
+ char chr = 0;
- head = inout;
- for (; inout != NULL; inout = inout->next) {
- if(inout->filter == NULL)
- continue; // Already processed
+ AVFilterInOut *currInputs = NULL;
- if(!strcmp(inout->name, "in")) {
- if(link_filter(in, inpad, inout->filter, inout->pad_idx))
- goto fail;
+ do {
+ AVFilterContext *filter;
+ filters += consume_whitespace(filters);
- } else if(!strcmp(inout->name, "out")) {
- has_out = 1;
+ if(parse_inputs(&filters, &currInputs, &openOutputs, log_ctx) < 0)
+ goto fail;
- if(link_filter(inout->filter, inout->pad_idx, out, outpad))
- goto fail;
+ filter = parse_filter(&filters, graph, index, log_ctx);
- } else {
- AVFilterInOut *p, *src, *dst;
- for (p = inout->next;
- p && strcmp(p->name,inout->name); p = p->next);
+ if(!filter)
+ goto fail;
- 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);
+ if(filter->input_count == 1 && !currInputs && !index) {
+ /* First input can be ommitted if it is "[in]" */
+ const char *tmp = "[in]";
+ if(parse_inputs(&tmp, &currInputs, &openOutputs, log_ctx) < 0)
goto fail;
- }
+ }
- if(link_filter(src->filter, src->pad_idx, dst->filter, dst->pad_idx) < 0)
- goto fail;
+ if(link_filter_inouts(filter, &currInputs, &openInputs, log_ctx) < 0)
+ goto fail;
- src->filter = NULL;
- dst->filter = NULL;
- }
- }
+ if(parse_outputs(&filters, &currInputs, &openInputs, &openOutputs,
+ log_ctx) < 0)
+ goto fail;
- free_inout(head);
+ filters += consume_whitespace(filters);
+ chr = *filters++;
+
+ 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 == ';');
- if(!has_out) {
- if(link_filter(last_filt, pad, out, outpad))
+ 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, &openInputs,
+ &openOutputs, log_ctx) < 0)
goto fail;
}
return 0;
fail:
- free_inout(head);
avfilter_destroy_graph(graph);
+ free_inout(openInputs);
+ free_inout(openOutputs);
+ free_inout(currInputs);
return -1;
}