#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 int create_filter(AVFilterGraph *ctx, int index, char *name,
- char *args)
+static AVFilterContext *create_filter(AVFilterGraph *ctx, int index,
+ const char *name, const char *args,
+ AVClass *log_ctx)
{
AVFilterContext *filt;
AVFilter *filterdef;
- char tmp[20];
+ 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;
+ }
- snprintf(tmp, 20, "%d", index);
- if(!(filterdef = avfilter_get_by_name(name)) ||
- !(filt = avfilter_open(filterdef, tmp))) {
- av_log(&log_ctx, AV_LOG_ERROR,
+ if(!(filt = avfilter_open(filterdef, inst_name))) {
+ av_log(log_ctx, AV_LOG_ERROR,
"error creating filter '%s'\n", name);
- return -1;
+ return NULL;
}
- if (avfilter_graph_add_filter(ctx, filt) < 0)
- return -1;
+ 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'\n", name);
- return -1;
+ av_log(log_ctx, AV_LOG_ERROR,
+ "error initializing filter '%s' with args '%s'\n", name, args);
+ return NULL;
}
- return 0;
+ return filt;
}
-static int link_filter(AVFilterGraph *ctx, int src, int srcpad,
- int dst, int dstpad)
+static int link_filter(AVFilterContext *src, int srcpad,
+ AVFilterContext *dst, int dstpad,
+ AVClass *log_ctx)
{
- AVFilterContext *filt, *filtb;
-
- char tmp[20];
-
- snprintf(tmp, 20, "%d", src);
- if(!(filt = avfilter_graph_get_filter(ctx, tmp))) {
- av_log(&log_ctx, AV_LOG_ERROR, "link source does not exist in graph\n");
- return -1;
- }
- snprintf(tmp, 20, "%d", dst);
- if(!(filtb = avfilter_graph_get_filter(ctx, tmp))) {
- av_log(&log_ctx, AV_LOG_ERROR, "link destination does not exist in graph\n");
- return -1;
- }
- if(avfilter_link(filt, srcpad, filtb, dstpad)) {
- av_log(&log_ctx, AV_LOG_ERROR, "cannot create link between source and destination filters\n");
+ if(avfilter_link(src, srcpad, dst, dstpad)) {
+ 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;
}
*buf += strspn(*buf, " \n\t");
}
-/**
- * Copy the first size bytes of input string to a null-terminated string,
- * removing any control character. Ex: "aaa'bb'c\'c\\" -> "aaabbc'c\"
- */
-static void copy_unquoted(char *out, const char *in, int size)
-{
- int i;
- for (i=0; i < size; i++) {
- if (in[i] == '\'')
- continue;
- else if (in[i] == '\\') {
- if (i+1 == size) {
- *out = 0;
- return;
- }
- i++;
- }
- *out++ = in[i];
- }
- *out=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;
+ char *out = av_malloc(strlen(*buf) + 1);
+ char *ret = out;
consume_whitespace(buf);
- if (!(**buf))
- return av_mallocz(1);
-
- start = *buf;
-
- while(1) {
- *buf += strcspn(*buf, " ()=,'\\");
- if (**buf == '\\')
- *buf+=2;
- else
+ do{
+ char c = *(*buf)++;
+ switch (c) {
+ case '\\':
+ *out++= *(*buf)++;
break;
- }
-
- if (**buf == '\'') {
- const char *p = *buf;
- do {
- p++;
- p = strchr(p, '\'');
- } while (p && p[-1] == '\\');
- if (p)
- *buf = p + 1;
- else
- *buf += strlen(*buf); // Move the pointer to the null end byte
- }
+ case '\'':
+ while(**buf && **buf != '\'')
+ *out++= *(*buf)++;
+ if(**buf) (*buf)++;
+ break;
+ case 0:
+ case ']':
+ case '[':
+ case '=':
+ case ',':
+ case ';':
+ case ' ':
+ case '\n':
+ *out++= 0;
+ break;
+ default:
+ *out++= c;
+ }
+ } while(out[-1]);
- size = *buf - start + 1;
- ret = av_malloc(size);
- copy_unquoted(ret, start, size-1);
+ (*buf)--;
+ consume_whitespace(buf);
return ret;
}
/**
- * Parse "(linkname)"
+ * 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)
+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])
- goto fail;
-
- if (*(*buf)++ != ')')
+ if(!*name[0]) {
+ av_log(log_ctx, AV_LOG_ERROR,
+ "Bad (empty?) label found in the following: \"%s\".\n", start);
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 int 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);
+ if(*(*buf)++ != ']') {
+ av_log(log_ctx, AV_LOG_ERROR,
+ "Mismatched '[' found in the following: \"%s\".\n", start);
+ fail:
+ av_freep(name);
+ }
}
+
enum LinkType {
LinkTypeIn,
LinkTypeOut,
*/
typedef struct AVFilterInOut {
enum LinkType type;
- char *name;
- int instance;
+ const char *name;
+ AVFilterContext *filter;
int pad_idx;
struct AVFilterInOut *next;
static void free_inout(AVFilterInOut *head)
{
while (head) {
- AVFilterInOut *next;
- next = head->next;
+ AVFilterInOut *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)
+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 = 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;
+ 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;
+ }
}
- return pad;
+
+
+ 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 a string describing a filter graph.
+ * 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
*/
-int avfilter_graph_parse_chain(AVFilterGraph *graph, const char *filters, AVFilterContext *in, int inpad, AVFilterContext *out, int outpad)
+static AVFilterContext *parse_filter(const char **buf, AVFilterGraph *graph,
+ int index, AVClass *log_ctx)
{
- AVFilterInOut *inout=NULL;
- AVFilterInOut *head=NULL;
+ char *opts;
+ char *name = consume_string(buf);
- int index = 0;
- char chr = 0;
- int pad = 0;
- int has_out = 0;
+ if(**buf == '=') {
+ (*buf)++;
+ opts = consume_string(buf);
+ } else {
+ opts = NULL;
+ }
- char tmp[20];
- AVFilterContext *filt;
+ return create_filter(graph, index, name, opts, log_ctx);
+}
- consume_whitespace(&filters);
+static int parse_inputs(const char **buf, AVFilterInOut **currInputs,
+ AVFilterInOut **openLinks, AVClass *log_ctx)
+{
+ int pad = 0;
- do {
- int oldpad = pad;
+ while (**buf == '[') {
+ char *name;
+ AVFilterInOut *link_to_add;
+ AVFilterInOut *match;
- pad = parse_inouts(&filters, &inout, chr == ',', LinkTypeIn, index);
+ parse_link_name(buf, &name, log_ctx);
- if (parse_filter(&filters, graph, index) < 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 && graph->filters[graph->filter_count-1]->input_count == 1) {
- snprintf(tmp, 20, "%d", index);
- if(!(filt = avfilter_graph_get_filter(graph, tmp))) {
- av_log(&log_ctx, AV_LOG_ERROR, "filter owning exported pad does not exist\n");
- goto fail;
- }
- if(avfilter_link(in, inpad, filt, 0)) {
- av_log(&log_ctx, AV_LOG_ERROR, "cannot create link between source and destination filters\n");
- goto fail;
+ /* 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;
}
- }
- if(chr == ',') {
- if (link_filter(graph, index-1, oldpad, index, 0) < 0)
- goto fail;
+ 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;
}
- pad = parse_inouts(&filters, &inout, 0, LinkTypeOut, index);
- chr = *filters++;
- index++;
- } while (chr == ',' || chr == ';');
+ link_to_add->next = *currInputs;
+ *currInputs = link_to_add;
+ consume_whitespace(buf);
+ pad++;
+ }
- head = inout;
- for (; inout != NULL; inout = inout->next) {
- if (inout->instance == -1)
- continue; // Already processed
+ return pad;
+}
- if (!strcmp(inout->name, "in")) {
- snprintf(tmp, 20, "%d", inout->instance);
- if(!(filt = avfilter_graph_get_filter(graph, tmp))) {
- av_log(&log_ctx, AV_LOG_ERROR, "filter owning exported pad does not exist\n");
- goto fail;
- }
- if(avfilter_link(in, inpad, filt, inout->pad_idx)) {
- av_log(&log_ctx, AV_LOG_ERROR, "cannot create link between source and destination filters\n");
- goto fail;
- }
- } else if (!strcmp(inout->name, "out")) {
- has_out = 1;
- snprintf(tmp, 20, "%d", inout->instance);
- if(!(filt = avfilter_graph_get_filter(graph, tmp))) {
- av_log(&log_ctx, AV_LOG_ERROR, "filter owning exported pad does not exist\n");
- goto fail;
- }
+static int parse_outputs(const char **buf, AVFilterInOut **currInputs,
+ AVFilterInOut **openLinks, AVClass *log_ctx)
+{
+ int pad = 0;
- if(avfilter_link(filt, inout->pad_idx, out, outpad)) {
- av_log(&log_ctx, AV_LOG_ERROR, "cannot create link between source and destination filters\n");
- goto fail;
- }
+ while (**buf == '[') {
+ char *name;
+ AVFilterInOut *match;
- } else {
- AVFilterInOut *p, *src, *dst;
- for (p = inout->next;
- p && strcmp(p->name,inout->name); p = p->next);
+ AVFilterInOut *input = *currInputs;
+ *currInputs = (*currInputs)->next;
- if (!p) {
- av_log(&log_ctx, AV_LOG_ERROR, "Unmatched link: %s.\n",
- inout->name);
- goto fail;
- }
+ parse_link_name(buf, &name, log_ctx);
- 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(!name)
+ return -1;
- if (link_filter(graph, src->instance, src->pad_idx, dst->instance, dst->pad_idx) < 0)
- goto fail;
+ /* First check if the label is not in the openLinks list */
+ match = extract_inout(name, openLinks);
- src->instance = -1;
- dst->instance = -1;
+ 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++;
}
- free_inout(head);
+ 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)
+{
+ int index = 0;
+ char chr = 0;
+ int pad = 0;
- if (!has_out) {
- snprintf(tmp, 20, "%d", index-1);
- if(!(filt = avfilter_graph_get_filter(graph, tmp))) {
- av_log(&log_ctx, AV_LOG_ERROR, "filter owning exported pad does not exist\n");
+ 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;
+ consume_whitespace(&filters);
+
+ pad = parse_inputs(&filters, &currInputs, &openLinks, log_ctx);
+
+ if(pad < 0)
+ goto fail;
+
+ if(!(filter = parse_filter(&filters, graph, index, log_ctx)))
goto fail;
+
+ 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(avfilter_link(filt, pad, out, outpad)) {
- av_log(&log_ctx, AV_LOG_ERROR, "cannot create link between source and destination filters\n");
+ if(link_filter_inouts(filter, &currInputs, &openLinks, log_ctx) < 0)
+ goto fail;
+
+ pad = parse_outputs(&filters, &currInputs, &openLinks, log_ctx);
+
+ if(pad < 0)
+ goto fail;
+
+ 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(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