[FFmpeg-cvslog] r12735 - trunk/libavfilter/avfiltergraph.c
vitor
subversion
Fri Apr 4 22:08:53 CEST 2008
Author: vitor
Date: Fri Apr 4 22:08:52 2008
New Revision: 12735
Log:
Merge avfiltergraphdesc.c in avfiltergraph.c
Commited in SoC by Vitor Sessak on 2008-03-24 20:46:50
Modified:
trunk/libavfilter/avfiltergraph.c
Modified: trunk/libavfilter/avfiltergraph.c
==============================================================================
--- trunk/libavfilter/avfiltergraph.c (original)
+++ trunk/libavfilter/avfiltergraph.c Fri Apr 4 22:08:52 2008
@@ -1,5 +1,6 @@
/*
* 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;
+ }
+}
+
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