[FFmpeg-cvslog] r13285 - trunk/libavfilter/graphparser.c
vitor
subversion
Sat May 24 22:35:44 CEST 2008
Author: vitor
Date: Sat May 24 22:35:43 2008
New Revision: 13285
Log:
I should not have merged the graph parser with the graph
framework. Split it.
Commited in SoC by Vitor Sessak on 2008-04-03 16:29:07
Added:
trunk/libavfilter/graphparser.c
Added: trunk/libavfilter/graphparser.c
==============================================================================
--- (empty file)
+++ trunk/libavfilter/graphparser.c Sat May 24 22:35:43 2008
@@ -0,0 +1,387 @@
+/*
+ * filter graph parser
+ * copyright (c) 2008 Vitor Sessak
+ * copyright (c) 2007 Bobby Bingham
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <ctype.h>
+#include <string.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 int create_filter(AVFilterGraph *ctx, int index, char *name,
+ char *args)
+{
+ AVFilterContext *filt;
+
+ AVFilter *filterdef;
+ char tmp[20];
+
+ snprintf(tmp, 20, "%d", index);
+ if(!(filterdef = avfilter_get_by_name(name)) ||
+ !(filt = avfilter_open(filterdef, tmp))) {
+ av_log(&log_ctx, AV_LOG_ERROR,
+ "error creating filter '%s'\n", name);
+ return -1;
+ }
+ avfilter_graph_add_filter(ctx, filt);
+ if(avfilter_init_filter(filt, args, NULL)) {
+ av_log(&log_ctx, AV_LOG_ERROR,
+ "error initializing filter '%s'\n", name);
+ return -1;
+ }
+
+ return 0;
+}
+
+static int link_filter(AVFilterGraph *ctx, int src, int srcpad,
+ int dst, int dstpad)
+{
+ 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");
+ return -1;
+ }
+
+ return 0;
+}
+
+static void consume_whitespace(const char **buf)
+{
+ *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;
+
+ consume_whitespace(buf);
+
+ if (!(**buf))
+ return av_mallocz(1);
+
+ start = *buf;
+
+ while(1) {
+ *buf += strcspn(*buf, " ()=,'\\");
+ if (**buf == '\\')
+ *buf+=2;
+ else
+ 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
+ }
+
+ size = *buf - start + 1;
+ ret = av_malloc(size);
+ copy_unquoted(ret, start, size-1);
+
+ 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)
+{
+ (*buf)++;
+
+ *name = consume_string(buf);
+
+ if (!*name[0])
+ goto fail;
+
+ if (*(*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 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);
+}
+
+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;
+}
+
+/**
+ * Parse a string describing a filter graph.
+ */
+int avfilter_graph_parse_chain(AVFilterGraph *graph, const char *filters, AVFilterContext *in, int inpad, AVFilterContext *out, int outpad)
+{
+ AVFilterInOut *inout=NULL;
+ AVFilterInOut *head=NULL;
+
+ int index = 0;
+ char chr = 0;
+ int pad = 0;
+ int has_out = 0;
+
+ char tmp[20];
+ AVFilterContext *filt;
+
+ consume_whitespace(&filters);
+
+ do {
+ int oldpad = pad;
+
+ pad = parse_inouts(&filters, &inout, chr == ',', LinkTypeIn, index);
+
+ if (parse_filter(&filters, graph, index) < 0)
+ 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 && 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;
+ }
+ }
+
+ if(chr == ',') {
+ if (link_filter(graph, index-1, oldpad, index, 0) < 0)
+ goto fail;
+
+ }
+ pad = parse_inouts(&filters, &inout, 0, LinkTypeOut, index);
+ chr = *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")) {
+ 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;
+ }
+
+ 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;
+ }
+
+ } 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(graph, src->instance, src->pad_idx, dst->instance, dst->pad_idx) < 0)
+ goto fail;
+
+ src->instance = -1;
+ dst->instance = -1;
+ }
+ }
+
+ free_inout(head);
+
+ 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");
+ 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");
+ goto fail;
+ }
+
+ }
+
+ return 0;
+
+ fail:
+ free_inout(head);
+ avfilter_destroy_graph(graph);
+ return -1;
+}
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