#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,
- const char *name, const char *args)
+ const char *name, const char *args,
+ AVClass *log_ctx)
{
AVFilterContext *filt;
snprintf(inst_name, sizeof(inst_name), "Parsed filter %d", index);
if(!(filterdef = avfilter_get_by_name(name))) {
- av_log(&log_ctx, AV_LOG_ERROR,
+ 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,
+ av_log(log_ctx, AV_LOG_ERROR,
"error creating filter '%s'\n", name);
return NULL;
}
return NULL;
if(avfilter_init_filter(filt, args, NULL)) {
- av_log(&log_ctx, AV_LOG_ERROR,
+ av_log(log_ctx, AV_LOG_ERROR,
"error initializing filter '%s' with args '%s'\n", name, args);
return NULL;
}
}
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;
case '[':
case '=':
case ',':
+ case ';':
case ' ':
case '\n':
*out++= 0;
* @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)
+static void parse_link_name(const char **buf, char **name, AVClass *log_ctx)
{
const char *start = *buf;
(*buf)++;
*name = consume_string(buf);
if(!*name[0]) {
- av_log(&log_ctx, AV_LOG_ERROR,
+ 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;
-
- fail:
- av_freep(name);
}
-/**
- * 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)
-{
- char *name, *opts;
- name = consume_string(buf);
-
- if(**buf == '=') {
- (*buf)++;
- opts = consume_string(buf);
- } else {
- opts = NULL;
- }
-
- return create_filter(graph, index, name, opts);
-}
enum LinkType {
LinkTypeIn,
*/
typedef struct AVFilterInOut {
enum LinkType type;
- char *name;
+ const char *name;
AVFilterContext *filter;
int pad_idx;
}
}
+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 int link_filter_inouts(AVFilterContext *filter,
+ AVFilterInOut **currInputs,
+ AVFilterInOut **openLinks, AVClass *log_ctx)
+{
+ int pad = 0;
+
+ pad = filter->input_count;
+ while(pad--) {
+ AVFilterInOut *p= *currInputs;
+ *currInputs = (*currInputs)->next;
+ if(!p) {
+ av_log(log_ctx, AV_LOG_ERROR,
+ "Not enough inputs specified for the \"%s\" filter.\n",
+ filter->name);
+ return -1;
+ }
+
+ if(p->filter) {
+ if(link_filter(p->filter, p->pad_idx, filter, pad, log_ctx))
+ return -1;
+ av_free(p);
+ } else {
+ p->filter = filter;
+ p->pad_idx = pad;
+ p->next = *openLinks;
+ *openLinks = p;
+ }
+ }
+
+
+ if(*currInputs) {
+ av_log(log_ctx, AV_LOG_ERROR,
+ "Too many inputs specified for the \"%s\" filter.\n",
+ filter->name);
+ return -1;
+ }
+
+ pad = filter->output_count;
+ while(pad--) {
+ AVFilterInOut *currlinkn = av_malloc(sizeof(AVFilterInOut));
+ currlinkn->name = NULL;
+ currlinkn->type = LinkTypeOut;
+ currlinkn->filter = filter;
+ currlinkn->pad_idx = pad;
+ currlinkn->next = *currInputs;
+ *currInputs = currlinkn;
+ }
+
+ return 0;
+}
+
/**
- * Parse "[a1][link2] ... [etc]"
+ * 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 int parse_inouts(const char **buf, AVFilterInOut **inout, int pad,
- enum LinkType type, AVFilterContext *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)
{
+ int pad = 0;
+
while (**buf == '[') {
- AVFilterInOut *inoutn = av_malloc(sizeof(AVFilterInOut));
- parse_link_name(buf, &inoutn->name);
+ char *name;
+ AVFilterInOut *link_to_add;
+ AVFilterInOut *match;
+
+ parse_link_name(buf, &name, log_ctx);
- if (!inoutn->name) {
- av_free(inoutn);
+ if(!name)
return -1;
- }
- inoutn->type = type;
- inoutn->filter = filter;
- inoutn->pad_idx = pad++;
- inoutn->next = *inout;
- *inout = inoutn;
+ /* First check if the label is not in the openLinks list */
+ match = extract_inout(name, openLinks);
+
+ 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;
+ } 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;
+ }
+ link_to_add->next = *currInputs;
+ *currInputs = link_to_add;
consume_whitespace(buf);
+ pad++;
}
+
return pad;
}
-static const char *skip_inouts(const char *buf)
+static int parse_outputs(const char **buf, AVFilterInOut **currInputs,
+ AVFilterInOut **openLinks, AVClass *log_ctx)
{
- while (*buf == '[') {
- buf += strcspn(buf, "]") + 1;
- consume_whitespace(&buf);
+ int pad = 0;
+
+ while (**buf == '[') {
+ char *name;
+ 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);
+
+ 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);
+ av_free(input);
+ } else {
+ /* Not in the list, so add the first input as a openLink */
+ input->next = *openLinks;
+ input->type = LinkTypeOut;
+ input->name = name;
+ *openLinks = input;
+ }
+ consume_whitespace(buf);
+ pad++;
}
- return buf;
-}
+ 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)
+ AVFilterContext *out, int outpad,
+ AVClass *log_ctx)
{
- AVFilterInOut *inout=NULL;
- AVFilterInOut *head=NULL;
-
int index = 0;
char chr = 0;
int pad = 0;
- int has_out = 0;
- AVFilterContext *last_filt = NULL;
+ 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;
do {
AVFilterContext *filter;
- int oldpad = pad;
- const char *inouts;
-
consume_whitespace(&filters);
- inouts = filters;
- // We need to parse the inputs of the filter after we create it, so
- // skip it by now
- filters = skip_inouts(filters);
+ pad = parse_inputs(&filters, &currInputs, &openLinks, log_ctx);
- if(!(filter = parse_filter(&filters, graph, index)))
+ if(pad < 0)
goto fail;
- pad = parse_inouts(&inouts, &inout, chr == ',', LinkTypeIn, filter);
-
- if(pad < 0)
+ if(!(filter = parse_filter(&filters, graph, index, log_ctx)))
goto fail;
- // 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))
+ if(filter->input_count == 1 && !currInputs && !index) {
+ // First input can be ommitted if it is "[in]"
+ const char *tmp = "[in]";
+ pad = parse_inputs(&tmp, &currInputs, &openLinks, log_ctx);
+ if (pad < 0)
goto fail;
}
- if(chr == ',') {
- if(link_filter(last_filt, oldpad, filter, 0) < 0)
- goto fail;
- }
+ if(link_filter_inouts(filter, &currInputs, &openLinks, log_ctx) < 0)
+ goto fail;
- pad = parse_inouts(&filters, &inout, 0, LinkTypeOut, filter);
+ pad = parse_outputs(&filters, &currInputs, &openLinks, log_ctx);
- consume_whitespace(&filters);
+ if(pad < 0)
+ goto fail;
+ consume_whitespace(&filters);
chr = *filters++;
- index++;
- last_filt = filter;
- } while (chr == ',' || chr == ';');
-
- head = inout;
- for (; inout; inout = inout->next) {
- if(!inout->filter)
- continue; // Already processed
-
- if(!strcmp(inout->name, "in")) {
- if(link_filter(in, inpad, inout->filter, inout->pad_idx))
- goto fail;
-
- } else if(!strcmp(inout->name, "out")) {
- has_out = 1;
- if(link_filter(inout->filter, inout->pad_idx, out, outpad))
- goto fail;
-
- } 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;
- }
-
- if(link_filter(src->filter, src->pad_idx, dst->filter, dst->pad_idx) < 0)
- goto fail;
-
- src->filter = NULL;
- dst->filter = NULL;
+ 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;
}
- }
-
- free_inout(head);
+ index++;
+ } while (chr == ',' || chr == ';');
- if(!has_out) {
- if(link_filter(last_filt, pad, out, outpad))
+ if(openLinks && !strcmp(openLinks->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)
goto fail;
}
return 0;
fail:
- free_inout(head);
avfilter_destroy_graph(graph);
+ free_inout(openLinks);
+ free_inout(currInputs);
return -1;
}
projects / ffmpeg / blobdiff