diff options
Diffstat (limited to 'ffmpeg1/libavfilter/graphparser.c')
| -rw-r--r-- | ffmpeg1/libavfilter/graphparser.c | 601 |
1 files changed, 0 insertions, 601 deletions
diff --git a/ffmpeg1/libavfilter/graphparser.c b/ffmpeg1/libavfilter/graphparser.c deleted file mode 100644 index 8d2fffc..0000000 --- a/ffmpeg1/libavfilter/graphparser.c +++ /dev/null @@ -1,601 +0,0 @@ -/* - * 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 <string.h> -#include <stdio.h> - -#include "libavutil/avstring.h" -#include "libavutil/mem.h" -#include "avfilter.h" -#include "avfiltergraph.h" - -#define WHITESPACES " \n\t" - -/** - * Link two filters together. - * - * @see avfilter_link() - */ -static int link_filter(AVFilterContext *src, int srcpad, - AVFilterContext *dst, int dstpad, - void *log_ctx) -{ - int ret; - if ((ret = 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 ret; - } - - return 0; -} - -/** - * Parse the name of a link, which has the format "[linkname]". - * - * @return a pointer (that need to be freed after use) to the name - * between parenthesis - */ -static char *parse_link_name(const char **buf, void *log_ctx) -{ - const char *start = *buf; - char *name; - (*buf)++; - - name = av_get_token(buf, "]"); - - 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, - "Mismatched '[' found in the following: \"%s\".\n", start); - fail: - av_freep(&name); - } - - return name; -} - -/** - * Create an instance of a filter, initialize and insert it in the - * filtergraph in *ctx. - * - * @param filt_ctx put here a filter context in case of successful creation and configuration, NULL otherwise. - * @param ctx the filtergraph context - * @param index an index which is supposed to be unique for each filter instance added to the filtergraph - * @param filt_name the name of the filter to create - * @param args the arguments provided to the filter during its initialization - * @param log_ctx the log context to use - * @return 0 in case of success, a negative AVERROR code otherwise - */ -static int create_filter(AVFilterContext **filt_ctx, AVFilterGraph *ctx, int index, - const char *filt_name, const char *args, void *log_ctx) -{ - AVFilter *filt; - char inst_name[30]; - char tmp_args[256]; - int ret; - - snprintf(inst_name, sizeof(inst_name), "Parsed_%s_%d", filt_name, index); - - filt = avfilter_get_by_name(filt_name); - - if (!filt) { - av_log(log_ctx, AV_LOG_ERROR, - "No such filter: '%s'\n", filt_name); - return AVERROR(EINVAL); - } - - ret = avfilter_open(filt_ctx, filt, inst_name); - if (!*filt_ctx) { - av_log(log_ctx, AV_LOG_ERROR, - "Error creating filter '%s'\n", filt_name); - return ret; - } - - if ((ret = avfilter_graph_add_filter(ctx, *filt_ctx)) < 0) { - avfilter_free(*filt_ctx); - return ret; - } - - if (!strcmp(filt_name, "scale") && args && !strstr(args, "flags") - && ctx->scale_sws_opts) { - snprintf(tmp_args, sizeof(tmp_args), "%s:%s", - args, ctx->scale_sws_opts); - args = tmp_args; - } - - if ((ret = avfilter_init_filter(*filt_ctx, args, NULL)) < 0) { - av_log(log_ctx, AV_LOG_ERROR, - "Error initializing filter '%s' with args '%s'\n", filt_name, args); - return ret; - } - - return 0; -} - -/** - * Parse a string of the form FILTER_NAME[=PARAMS], and create a - * corresponding filter instance which is added to graph with - * create_filter(). - * - * @param filt_ctx Pointer that is set to the created and configured filter - * context on success, set to NULL on failure. - * @param filt_ctx put here a pointer to the created filter context on - * success, NULL otherwise - * @param buf pointer to the buffer to parse, *buf will be updated to - * point to the char next after the parsed string - * @param index an index which is assigned to the created filter - * instance, and which is supposed to be unique for each filter - * instance added to the filtergraph - * @return 0 in case of success, a negative AVERROR code otherwise - */ -static int parse_filter(AVFilterContext **filt_ctx, const char **buf, AVFilterGraph *graph, - int index, void *log_ctx) -{ - char *opts = NULL; - char *name = av_get_token(buf, "=,;[\n"); - int ret; - - if (**buf == '=') { - (*buf)++; - opts = av_get_token(buf, "[],;\n"); - } - - ret = create_filter(filt_ctx, graph, index, name, opts, log_ctx); - av_free(name); - av_free(opts); - return ret; -} - -AVFilterInOut *avfilter_inout_alloc(void) -{ - return av_mallocz(sizeof(AVFilterInOut)); -} - -void avfilter_inout_free(AVFilterInOut **inout) -{ - while (*inout) { - AVFilterInOut *next = (*inout)->next; - av_freep(&(*inout)->name); - av_freep(inout); - *inout = next; - } -} - -static AVFilterInOut *extract_inout(const char *label, AVFilterInOut **links) -{ - AVFilterInOut *ret; - - while (*links && (!(*links)->name || strcmp((*links)->name, label))) - links = &((*links)->next); - - ret = *links; - - if (ret) { - *links = ret->next; - ret->next = NULL; - } - - return ret; -} - -static void insert_inout(AVFilterInOut **inouts, AVFilterInOut *element) -{ - element->next = *inouts; - *inouts = element; -} - -static void append_inout(AVFilterInOut **inouts, AVFilterInOut **element) -{ - while (*inouts && (*inouts)->next) - inouts = &((*inouts)->next); - - if (!*inouts) - *inouts = *element; - else - (*inouts)->next = *element; - *element = NULL; -} - -static int link_filter_inouts(AVFilterContext *filt_ctx, - AVFilterInOut **curr_inputs, - AVFilterInOut **open_inputs, void *log_ctx) -{ - int pad, ret; - - for (pad = 0; pad < filt_ctx->nb_inputs; pad++) { - AVFilterInOut *p = *curr_inputs; - - if (p) { - *curr_inputs = (*curr_inputs)->next; - p->next = NULL; - } else if (!(p = av_mallocz(sizeof(*p)))) - return AVERROR(ENOMEM); - - if (p->filter_ctx) { - ret = link_filter(p->filter_ctx, p->pad_idx, filt_ctx, pad, log_ctx); - av_free(p->name); - av_free(p); - if (ret < 0) - return ret; - } else { - p->filter_ctx = filt_ctx; - p->pad_idx = pad; - append_inout(open_inputs, &p); - } - } - - if (*curr_inputs) { - av_log(log_ctx, AV_LOG_ERROR, - "Too many inputs specified for the \"%s\" filter.\n", - filt_ctx->filter->name); - return AVERROR(EINVAL); - } - - pad = filt_ctx->nb_outputs; - while (pad--) { - AVFilterInOut *currlinkn = av_mallocz(sizeof(AVFilterInOut)); - if (!currlinkn) - return AVERROR(ENOMEM); - currlinkn->filter_ctx = filt_ctx; - currlinkn->pad_idx = pad; - insert_inout(curr_inputs, currlinkn); - } - - return 0; -} - -static int parse_inputs(const char **buf, AVFilterInOut **curr_inputs, - AVFilterInOut **open_outputs, void *log_ctx) -{ - AVFilterInOut *parsed_inputs = NULL; - int pad = 0; - - while (**buf == '[') { - char *name = parse_link_name(buf, log_ctx); - AVFilterInOut *match; - - if (!name) - return AVERROR(EINVAL); - - /* First check if the label is not in the open_outputs list */ - match = extract_inout(name, open_outputs); - - if (match) { - av_free(name); - } else { - /* Not in the list, so add it as an input */ - if (!(match = av_mallocz(sizeof(AVFilterInOut)))) { - av_free(name); - return AVERROR(ENOMEM); - } - match->name = name; - match->pad_idx = pad; - } - - append_inout(&parsed_inputs, &match); - - *buf += strspn(*buf, WHITESPACES); - pad++; - } - - append_inout(&parsed_inputs, curr_inputs); - *curr_inputs = parsed_inputs; - - return pad; -} - -static int parse_outputs(const char **buf, AVFilterInOut **curr_inputs, - AVFilterInOut **open_inputs, - AVFilterInOut **open_outputs, void *log_ctx) -{ - int ret, pad = 0; - - while (**buf == '[') { - char *name = parse_link_name(buf, log_ctx); - AVFilterInOut *match; - - AVFilterInOut *input = *curr_inputs; - - if (!name) - return AVERROR(EINVAL); - - if (!input) { - av_log(log_ctx, AV_LOG_ERROR, - "No output pad can be associated to link label '%s'.\n", name); - av_free(name); - return AVERROR(EINVAL); - } - *curr_inputs = (*curr_inputs)->next; - - /* First check if the label is not in the open_inputs list */ - match = extract_inout(name, open_inputs); - - if (match) { - if ((ret = link_filter(input->filter_ctx, input->pad_idx, - match->filter_ctx, match->pad_idx, log_ctx)) < 0) { - av_free(name); - return ret; - } - 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 open_output */ - input->name = name; - insert_inout(open_outputs, input); - } - *buf += strspn(*buf, WHITESPACES); - pad++; - } - - return pad; -} - -static int parse_sws_flags(const char **buf, AVFilterGraph *graph) -{ - char *p = strchr(*buf, ';'); - - if (strncmp(*buf, "sws_flags=", 10)) - return 0; - - if (!p) { - av_log(graph, AV_LOG_ERROR, "sws_flags not terminated with ';'.\n"); - return AVERROR(EINVAL); - } - - *buf += 4; // keep the 'flags=' part - - av_freep(&graph->scale_sws_opts); - if (!(graph->scale_sws_opts = av_mallocz(p - *buf + 1))) - return AVERROR(ENOMEM); - av_strlcpy(graph->scale_sws_opts, *buf, p - *buf + 1); - - *buf = p + 1; - return 0; -} - -int avfilter_graph_parse2(AVFilterGraph *graph, const char *filters, - AVFilterInOut **inputs, - AVFilterInOut **outputs) -{ - int index = 0, ret = 0; - char chr = 0; - - AVFilterInOut *curr_inputs = NULL, *open_inputs = NULL, *open_outputs = NULL; - - filters += strspn(filters, WHITESPACES); - - if ((ret = parse_sws_flags(&filters, graph)) < 0) - goto fail; - - do { - AVFilterContext *filter; - filters += strspn(filters, WHITESPACES); - - if ((ret = parse_inputs(&filters, &curr_inputs, &open_outputs, graph)) < 0) - goto end; - if ((ret = parse_filter(&filter, &filters, graph, index, graph)) < 0) - goto end; - - - if ((ret = link_filter_inouts(filter, &curr_inputs, &open_inputs, graph)) < 0) - goto end; - - if ((ret = parse_outputs(&filters, &curr_inputs, &open_inputs, &open_outputs, - graph)) < 0) - goto end; - - filters += strspn(filters, WHITESPACES); - chr = *filters++; - - if (chr == ';' && curr_inputs) - append_inout(&open_outputs, &curr_inputs); - index++; - } while (chr == ',' || chr == ';'); - - if (chr) { - av_log(graph, AV_LOG_ERROR, - "Unable to parse graph description substring: \"%s\"\n", - filters - 1); - ret = AVERROR(EINVAL); - goto end; - } - - append_inout(&open_outputs, &curr_inputs); - - - *inputs = open_inputs; - *outputs = open_outputs; - return 0; - - fail:end: - for (; graph->nb_filters > 0; graph->nb_filters--) - avfilter_free(graph->filters[graph->nb_filters - 1]); - av_freep(&graph->filters); - avfilter_inout_free(&open_inputs); - avfilter_inout_free(&open_outputs); - avfilter_inout_free(&curr_inputs); - - *inputs = NULL; - *outputs = NULL; - - return ret; -} - -int avfilter_graph_parse(AVFilterGraph *graph, const char *filters, - AVFilterInOut **open_inputs_ptr, AVFilterInOut **open_outputs_ptr, - void *log_ctx) -{ -#if 0 - int ret; - AVFilterInOut *open_inputs = open_inputs_ptr ? *open_inputs_ptr : NULL; - AVFilterInOut *open_outputs = open_outputs_ptr ? *open_outputs_ptr : NULL; - AVFilterInOut *cur, *match, *inputs = NULL, *outputs = NULL; - - if ((ret = avfilter_graph_parse2(graph, filters, &inputs, &outputs)) < 0) - goto fail; - - /* First input can be omitted if it is "[in]" */ - if (inputs && !inputs->name) - inputs->name = av_strdup("in"); - for (cur = inputs; cur; cur = cur->next) { - if (!cur->name) { - av_log(log_ctx, AV_LOG_ERROR, - "Not enough inputs specified for the \"%s\" filter.\n", - cur->filter_ctx->filter->name); - ret = AVERROR(EINVAL); - goto fail; - } - if (!(match = extract_inout(cur->name, &open_outputs))) - continue; - ret = avfilter_link(match->filter_ctx, match->pad_idx, - cur->filter_ctx, cur->pad_idx); - avfilter_inout_free(&match); - if (ret < 0) - goto fail; - } - - /* Last output can be omitted if it is "[out]" */ - if (outputs && !outputs->name) - outputs->name = av_strdup("out"); - for (cur = outputs; cur; cur = cur->next) { - if (!cur->name) { - av_log(log_ctx, AV_LOG_ERROR, - "Invalid filterchain containing an unlabelled output pad: \"%s\"\n", - filters); - ret = AVERROR(EINVAL); - goto fail; - } - if (!(match = extract_inout(cur->name, &open_inputs))) - continue; - ret = avfilter_link(cur->filter_ctx, cur->pad_idx, - match->filter_ctx, match->pad_idx); - avfilter_inout_free(&match); - if (ret < 0) - goto fail; - } - - fail: - if (ret < 0) { - for (; graph->nb_filters > 0; graph->nb_filters--) - avfilter_free(graph->filters[graph->nb_filters - 1]); - av_freep(&graph->filters); - } - avfilter_inout_free(&inputs); - avfilter_inout_free(&outputs); - /* clear open_in/outputs only if not passed as parameters */ - if (open_inputs_ptr) *open_inputs_ptr = open_inputs; - else avfilter_inout_free(&open_inputs); - if (open_outputs_ptr) *open_outputs_ptr = open_outputs; - else avfilter_inout_free(&open_outputs); - return ret; -} -#else - int index = 0, ret = 0; - char chr = 0; - - AVFilterInOut *curr_inputs = NULL; - AVFilterInOut *open_inputs = open_inputs_ptr ? *open_inputs_ptr : NULL; - AVFilterInOut *open_outputs = open_outputs_ptr ? *open_outputs_ptr : NULL; - - if ((ret = parse_sws_flags(&filters, graph)) < 0) - goto end; - - do { - AVFilterContext *filter; - const char *filterchain = filters; - filters += strspn(filters, WHITESPACES); - - if ((ret = parse_inputs(&filters, &curr_inputs, &open_outputs, log_ctx)) < 0) - goto end; - - if ((ret = parse_filter(&filter, &filters, graph, index, log_ctx)) < 0) - goto end; - - if (filter->input_count == 1 && !curr_inputs && !index) { - /* First input pad, assume it is "[in]" if not specified */ - const char *tmp = "[in]"; - if ((ret = parse_inputs(&tmp, &curr_inputs, &open_outputs, log_ctx)) < 0) - goto end; - } - - if ((ret = link_filter_inouts(filter, &curr_inputs, &open_inputs, log_ctx)) < 0) - goto end; - - if ((ret = parse_outputs(&filters, &curr_inputs, &open_inputs, &open_outputs, - log_ctx)) < 0) - goto end; - - filters += strspn(filters, WHITESPACES); - chr = *filters++; - - if (chr == ';' && curr_inputs) { - av_log(log_ctx, AV_LOG_ERROR, - "Invalid filterchain containing an unlabelled output pad: \"%s\"\n", - filterchain); - ret = AVERROR(EINVAL); - goto end; - } - index++; - } while (chr == ',' || chr == ';'); - - if (chr) { - av_log(log_ctx, AV_LOG_ERROR, - "Unable to parse graph description substring: \"%s\"\n", - filters - 1); - ret = AVERROR(EINVAL); - goto end; - } - - if (curr_inputs) { - /* Last output pad, assume it is "[out]" if not specified */ - const char *tmp = "[out]"; - if ((ret = parse_outputs(&tmp, &curr_inputs, &open_inputs, &open_outputs, - log_ctx)) < 0) - goto end; - } - -end: - /* clear open_in/outputs only if not passed as parameters */ - if (open_inputs_ptr) *open_inputs_ptr = open_inputs; - else avfilter_inout_free(&open_inputs); - if (open_outputs_ptr) *open_outputs_ptr = open_outputs; - else avfilter_inout_free(&open_outputs); - avfilter_inout_free(&curr_inputs); - - if (ret < 0) { - for (; graph->nb_filters > 0; graph->nb_filters--) - avfilter_free(graph->filters[graph->nb_filters - 1]); - av_freep(&graph->filters); - } - return ret; -} - -#endif |