FFmpeg coverage

GCC Code Coverage Report

Directory:	../../../ffmpeg/		Exec	Total	Coverage
File:	src/libavfilter/graphparser.c	Lines:	194	332	58.4 %
Date:	2021-01-22 05:18:52	Branches:	106	194	54.6 %


/*
 * 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"

#define WHITESPACES " \n\t\r"

/**
 * 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)
        return NULL;

    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 NULL;
    }
    (*buf)++;

    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 name the name of the filter to create, can be filter name or filter_name\@id as instance name
 * @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 *name, const char *args, void *log_ctx)
{
    const AVFilter *filt;
    char name2[30];
    const char *inst_name = NULL, *filt_name = NULL;
    char *tmp_args = NULL;
    int ret, k;

    av_strlcpy(name2, name, sizeof(name2));

    for (k = 0; name2[k]; k++) {
        if (name2[k] == '@' && name[k+1]) {
            name2[k] = 0;
            inst_name = name;
            filt_name = name2;
            break;
        }
    }

    if (!inst_name) {
        snprintf(name2, sizeof(name2), "Parsed_%s_%d", name, index);
        inst_name = name2;
        filt_name = name;
    }

    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);
    }

    *filt_ctx = avfilter_graph_alloc_filter(ctx, filt, inst_name);
    if (!*filt_ctx) {
        av_log(log_ctx, AV_LOG_ERROR,
               "Error creating filter '%s'\n", filt_name);
        return AVERROR(ENOMEM);
    }

    if (!strcmp(filt_name, "scale") && (!args || !strstr(args, "flags")) &&
        ctx->scale_sws_opts) {
        if (args) {
            tmp_args = av_asprintf("%s:%s",
                    args, ctx->scale_sws_opts);
            if (!tmp_args)
                return AVERROR(ENOMEM);
            args = tmp_args;
        } else
            args = ctx->scale_sws_opts;
    }

    ret = avfilter_init_str(*filt_ctx, args);
    if (ret < 0) {
        av_log(log_ctx, AV_LOG_ERROR,
               "Error initializing filter '%s'", filt_name);
        if (args)
            av_log(log_ctx, AV_LOG_ERROR, " with args '%s'", args);
        av_log(log_ctx, AV_LOG_ERROR, "\n");
        avfilter_free(*filt_ctx);
        *filt_ctx = NULL;
    }

    av_free(tmp_args);
    return ret;
}

/**
 * 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, "=,;[");
    int ret;

    if (!name)
        return AVERROR(ENOMEM);

    if (**buf == '=') {
        (*buf)++;
        opts = av_get_token(buf, "[],;");
        if (!opts) {
            av_free(name);
            return AVERROR(ENOMEM);
        }
    }

    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_freep(&p->name);
            av_freep(&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) {
            avfilter_inout_free(&parsed_inputs);
            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)))) {
                avfilter_inout_free(&parsed_inputs);
                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) {
            ret = link_filter(input->filter_ctx, input->pad_idx,
                              match->filter_ctx, match->pad_idx, log_ctx);
            av_freep(&match->name);
            av_freep(&name);
            av_freep(&match);
            av_freep(&input);
            if (ret < 0)
                return ret;
        } else {
            /* Not in the list, so add the first input as an 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:
    while (graph->nb_filters)
        avfilter_free(graph->filters[0]);
    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,
                         AVFilterInOut *open_outputs, void *log_ctx)
{
    int ret;
    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) {
        while (graph->nb_filters)
            avfilter_free(graph->filters[0]);
        av_freep(&graph->filters);
    }
    avfilter_inout_free(&inputs);
    avfilter_inout_free(&outputs);
    avfilter_inout_free(&open_inputs);
    avfilter_inout_free(&open_outputs);
    return ret;
}

int avfilter_graph_parse_ptr(AVFilterGraph *graph, const char *filters,
                         AVFilterInOut **open_inputs_ptr, AVFilterInOut **open_outputs_ptr,
                         void *log_ctx)
{
    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->nb_inputs == 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) {
        while (graph->nb_filters)
            avfilter_free(graph->filters[0]);
        av_freep(&graph->filters);
    }
    return ret;
}


Generated by: GCOVR (Version 4.2)

Line	Branch	Exec	Source
1			/*
2			* filter graph parser
3			* Copyright (c) 2008 Vitor Sessak
4			* Copyright (c) 2007 Bobby Bingham
5			*
6			* This file is part of FFmpeg.
7			*
8			* FFmpeg is free software; you can redistribute it and/or
9			* modify it under the terms of the GNU Lesser General Public
10			* License as published by the Free Software Foundation; either
11			* version 2.1 of the License, or (at your option) any later version.
12			*
13			* FFmpeg is distributed in the hope that it will be useful,
14			* but WITHOUT ANY WARRANTY; without even the implied warranty of
15			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16			* Lesser General Public License for more details.
17			*
18			* You should have received a copy of the GNU Lesser General Public
19			* License along with FFmpeg; if not, write to the Free Software
20			* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21			*/
22
23			#include <string.h>
24			#include <stdio.h>
25
26			#include "libavutil/avstring.h"
27			#include "libavutil/mem.h"
28			#include "avfilter.h"
29
30			#define WHITESPACES " \n\t\r"
31
32			/**
33			* Link two filters together.
34			*
35			* @see avfilter_link()
36			*/
37		5789	static int link_filter(AVFilterContext *src, int srcpad,
38			AVFilterContext *dst, int dstpad,
39			void *log_ctx)
40			{
41			int ret;
42	✗✓	5789	if ((ret = avfilter_link(src, srcpad, dst, dstpad))) {
43			av_log(log_ctx, AV_LOG_ERROR,
44			"Cannot create the link %s:%d -> %s:%d\n",
45			src->filter->name, srcpad, dst->filter->name, dstpad);
46			return ret;
47			}
48
49		5789	return 0;
50			}
51
52			/**
53			* Parse the name of a link, which has the format "[linkname]".
54			*
55			* @return a pointer (that need to be freed after use) to the name
56			* between parenthesis
57			*/
58		375	static char parse_link_name(const char buf, void log_ctx)
59			{
60		375	const char start = buf;
61			char *name;
62		375	(*buf)++;
63
64		375	name = av_get_token(buf, "]");
65	✗✓	375	if (!name)
66			return NULL;
67
68	✗✓	375	if (!name[0]) {
69			av_log(log_ctx, AV_LOG_ERROR,
70			"Bad (empty?) label found in the following: \"%s\".\n", start);
71			goto fail;
72			}
73
74	✗✓	375	if (**buf != ']') {
75			av_log(log_ctx, AV_LOG_ERROR,
76			"Mismatched '[' found in the following: \"%s\".\n", start);
77			fail:
78			av_freep(&name);
79			return NULL;
80			}
81		375	(*buf)++;
82
83		375	return name;
84			}
85
86			/**
87			* Create an instance of a filter, initialize and insert it in the
88			* filtergraph in *ctx.
89			*
90			* @param filt_ctx put here a filter context in case of successful creation and configuration, NULL otherwise.
91			* @param ctx the filtergraph context
92			* @param index an index which is supposed to be unique for each filter instance added to the filtergraph
93			* @param name the name of the filter to create, can be filter name or filter_name\@id as instance name
94			* @param args the arguments provided to the filter during its initialization
95			* @param log_ctx the log context to use
96			* @return >= 0 in case of success, a negative AVERROR code otherwise
97			*/
98		11702	static int create_filter(AVFilterContext *filt_ctx, AVFilterGraph ctx, int index,
99			const char name, const char args, void *log_ctx)
100			{
101			const AVFilter *filt;
102			char name2[30];
103		11702	const char inst_name = NULL, filt_name = NULL;
104		11702	char *tmp_args = NULL;
105			int ret, k;
106
107		11702	av_strlcpy(name2, name, sizeof(name2));
108
109	✓✓	77532	for (k = 0; name2[k]; k++) {
110	✗✓✗✗	65830	if (name2[k] == '@' && name[k+1]) {
111			name2[k] = 0;
112			inst_name = name;
113			filt_name = name2;
114			break;
115			}
116			}
117
118	✓✗	11702	if (!inst_name) {
119		11702	snprintf(name2, sizeof(name2), "Parsed_%s_%d", name, index);
120		11702	inst_name = name2;
121		11702	filt_name = name;
122			}
123
124		11702	filt = avfilter_get_by_name(filt_name);
125
126	✗✓	11702	if (!filt) {
127			av_log(log_ctx, AV_LOG_ERROR,
128			"No such filter: '%s'\n", filt_name);
129			return AVERROR(EINVAL);
130			}
131
132		11702	*filt_ctx = avfilter_graph_alloc_filter(ctx, filt, inst_name);
133	✗✓	11702	if (!*filt_ctx) {
134			av_log(log_ctx, AV_LOG_ERROR,
135			"Error creating filter '%s'\n", filt_name);
136			return AVERROR(ENOMEM);
137			}
138
139	✓✓✓✓ ✓✓	11702	if (!strcmp(filt_name, "scale") && (!args \|\| !strstr(args, "flags")) &&
140	✓✓	2666	ctx->scale_sws_opts) {
141	✓✓	2652	if (args) {
142		201	tmp_args = av_asprintf("%s:%s",
143			args, ctx->scale_sws_opts);
144	✗✓	201	if (!tmp_args)
145			return AVERROR(ENOMEM);
146		201	args = tmp_args;
147			} else
148		2451	args = ctx->scale_sws_opts;
149			}
150
151		11702	ret = avfilter_init_str(*filt_ctx, args);
152	✗✓	11702	if (ret < 0) {
153			av_log(log_ctx, AV_LOG_ERROR,
154			"Error initializing filter '%s'", filt_name);
155			if (args)
156			av_log(log_ctx, AV_LOG_ERROR, " with args '%s'", args);
157			av_log(log_ctx, AV_LOG_ERROR, "\n");
158			avfilter_free(*filt_ctx);
159			*filt_ctx = NULL;
160			}
161
162		11702	av_free(tmp_args);
163		11702	return ret;
164			}
165
166			/**
167			* Parse a string of the form FILTER_NAME[=PARAMS], and create a
168			* corresponding filter instance which is added to graph with
169			* create_filter().
170			*
171			* @param filt_ctx Pointer that is set to the created and configured filter
172			* context on success, set to NULL on failure.
173			* @param filt_ctx put here a pointer to the created filter context on
174			* success, NULL otherwise
175			* @param buf pointer to the buffer to parse, *buf will be updated to
176			* point to the char next after the parsed string
177			* @param index an index which is assigned to the created filter
178			* instance, and which is supposed to be unique for each filter
179			* instance added to the filtergraph
180			* @return >= 0 in case of success, a negative AVERROR code otherwise
181			*/
182		11702	static int parse_filter(AVFilterContext filt_ctx, const char buf, AVFilterGraph *graph,
183			int index, void *log_ctx)
184			{
185		11702	char *opts = NULL;
186		11702	char *name = av_get_token(buf, "=,;[");
187			int ret;
188
189	✗✓	11702	if (!name)
190			return AVERROR(ENOMEM);
191
192	✓✓	11702	if (**buf == '=') {
193		6098	(*buf)++;
194		6098	opts = av_get_token(buf, "[],;");
195	✗✓	6098	if (!opts) {
196			av_free(name);
197			return AVERROR(ENOMEM);
198			}
199			}
200
201		11702	ret = create_filter(filt_ctx, graph, index, name, opts, log_ctx);
202		11702	av_free(name);
203		11702	av_free(opts);
204		11702	return ret;
205			}
206
207			AVFilterInOut *avfilter_inout_alloc(void)
208			{
209			return av_mallocz(sizeof(AVFilterInOut));
210			}
211
212		17722	void avfilter_inout_free(AVFilterInOut **inout)
213			{
214	✓✓	29547	while (*inout) {
215		11825	AVFilterInOut next = (inout)->next;
216		11825	av_freep(&(*inout)->name);
217		11825	av_freep(inout);
218		11825	*inout = next;
219			}
220		17722	}
221
222		375	static AVFilterInOut extract_inout(const char label, AVFilterInOut **links)
223			{
224			AVFilterInOut *ret;
225
226	✓✓✓✓ ✓✓	564	while (links && (!(links)->name \|\| strcmp((*links)->name, label)))
227		189	links = &((*links)->next);
228
229		375	ret = *links;
230
231	✓✓	375	if (ret) {
232		156	*links = ret->next;
233		156	ret->next = NULL;
234			}
235
236		375	return ret;
237			}
238
239		11937	static void insert_inout(AVFilterInOut *inouts, AVFilterInOut element)
240			{
241		11937	element->next = *inouts;
242		11937	*inouts = element;
243		11937	}
244
245		23668	static void append_inout(AVFilterInOut inouts, AVFilterInOut element)
246			{
247	✓✓✓✓	23783	while (inouts && (inouts)->next)
248		115	inouts = &((*inouts)->next);
249
250	✓✓	23668	if (!*inouts)
251		23440	inouts = element;
252			else
253		228	(inouts)->next = element;
254		23668	*element = NULL;
255		23668	}
256
257		11702	static int link_filter_inouts(AVFilterContext *filt_ctx,
258			AVFilterInOut **curr_inputs,
259			AVFilterInOut *open_inputs, void log_ctx)
260			{
261			int pad, ret;
262
263	✓✓	23363	for (pad = 0; pad < filt_ctx->nb_inputs; pad++) {
264		11661	AVFilterInOut p = curr_inputs;
265
266	✓✓	11661	if (p) {
267		5813	curr_inputs = (curr_inputs)->next;
268		5813	p->next = NULL;
269	✗✓	5848	} else if (!(p = av_mallocz(sizeof(*p))))
270			return AVERROR(ENOMEM);
271
272	✓✓	11661	if (p->filter_ctx) {
273		5789	ret = link_filter(p->filter_ctx, p->pad_idx, filt_ctx, pad, log_ctx);
274		5789	av_freep(&p->name);
275		5789	av_freep(&p);
276	✗✓	5789	if (ret < 0)
277			return ret;
278			} else {
279		5872	p->filter_ctx = filt_ctx;
280		5872	p->pad_idx = pad;
281		5872	append_inout(open_inputs, &p);
282			}
283			}
284
285	✗✓	11702	if (*curr_inputs) {
286			av_log(log_ctx, AV_LOG_ERROR,
287			"Too many inputs specified for the \"%s\" filter.\n",
288			filt_ctx->filter->name);
289			return AVERROR(EINVAL);
290			}
291
292		11702	pad = filt_ctx->nb_outputs;
293	✓✓	23444	while (pad--) {
294		11742	AVFilterInOut *currlinkn = av_mallocz(sizeof(AVFilterInOut));
295	✗✓	11742	if (!currlinkn)
296			return AVERROR(ENOMEM);
297		11742	currlinkn->filter_ctx = filt_ctx;
298		11742	currlinkn->pad_idx = pad;
299		11742	insert_inout(curr_inputs, currlinkn);
300			}
301
302		11702	return 0;
303			}
304
305		11702	static int parse_inputs(const char buf, AVFilterInOut curr_inputs,
306			AVFilterInOut *open_outputs, void log_ctx)
307			{
308		11702	AVFilterInOut *parsed_inputs = NULL;
309		11702	int pad = 0;
310
311	✓✓	11882	while (**buf == '[') {
312		180	char *name = parse_link_name(buf, log_ctx);
313			AVFilterInOut *match;
314
315	✗✓	180	if (!name) {
316			avfilter_inout_free(&parsed_inputs);
317			return AVERROR(EINVAL);
318			}
319
320			/* First check if the label is not in the open_outputs list */
321		180	match = extract_inout(name, open_outputs);
322
323	✓✓	180	if (match) {
324		156	av_free(name);
325			} else {
326			/* Not in the list, so add it as an input */
327	✗✓	24	if (!(match = av_mallocz(sizeof(AVFilterInOut)))) {
328			avfilter_inout_free(&parsed_inputs);
329			av_free(name);
330			return AVERROR(ENOMEM);
331			}
332		24	match->name = name;
333		24	match->pad_idx = pad;
334			}
335
336		180	append_inout(&parsed_inputs, &match);
337
338		180	buf += strspn(buf, WHITESPACES);
339		180	pad++;
340			}
341
342		11702	append_inout(&parsed_inputs, curr_inputs);
343		11702	*curr_inputs = parsed_inputs;
344
345		11702	return pad;
346			}
347
348		11729	static int parse_outputs(const char buf, AVFilterInOut curr_inputs,
349			AVFilterInOut **open_inputs,
350			AVFilterInOut *open_outputs, void log_ctx)
351			{
352		11729	int ret, pad = 0;
353
354	✓✓	11924	while (**buf == '[') {
355		195	char *name = parse_link_name(buf, log_ctx);
356			AVFilterInOut *match;
357
358		195	AVFilterInOut input = curr_inputs;
359
360	✗✓	195	if (!name)
361			return AVERROR(EINVAL);
362
363	✗✓	195	if (!input) {
364			av_log(log_ctx, AV_LOG_ERROR,
365			"No output pad can be associated to link label '%s'.\n", name);
366			av_free(name);
367			return AVERROR(EINVAL);
368			}
369		195	curr_inputs = (curr_inputs)->next;
370
371			/* First check if the label is not in the open_inputs list */
372		195	match = extract_inout(name, open_inputs);
373
374	✗✓	195	if (match) {
375			ret = link_filter(input->filter_ctx, input->pad_idx,
376			match->filter_ctx, match->pad_idx, log_ctx);
377			av_freep(&match->name);
378			av_freep(&name);
379			av_freep(&match);
380			av_freep(&input);
381			if (ret < 0)
382			return ret;
383			} else {
384			/* Not in the list, so add the first input as an open_output */
385		195	input->name = name;
386		195	insert_inout(open_outputs, input);
387			}
388		195	buf += strspn(buf, WHITESPACES);
389		195	pad++;
390			}
391
392		11729	return pad;
393			}
394
395		5945	static int parse_sws_flags(const char *buf, AVFilterGraph graph)
396			{
397		5945	char p = strchr(buf, ';');
398
399	✓✓	5945	if (strncmp(*buf, "sws_flags=", 10))
400		5900	return 0;
401
402	✗✓	45	if (!p) {
403			av_log(graph, AV_LOG_ERROR, "sws_flags not terminated with ';'.\n");
404			return AVERROR(EINVAL);
405			}
406
407		45	*buf += 4; // keep the 'flags=' part
408
409		45	av_freep(&graph->scale_sws_opts);
410	✗✓	45	if (!(graph->scale_sws_opts = av_mallocz(p - *buf + 1)))
411			return AVERROR(ENOMEM);
412		45	av_strlcpy(graph->scale_sws_opts, buf, p - buf + 1);
413
414		45	*buf = p + 1;
415		45	return 0;
416			}
417
418		5914	int avfilter_graph_parse2(AVFilterGraph graph, const char filters,
419			AVFilterInOut **inputs,
420			AVFilterInOut **outputs)
421			{
422		5914	int index = 0, ret = 0;
423		5914	char chr = 0;
424
425		5914	AVFilterInOut curr_inputs = NULL, open_inputs = NULL, *open_outputs = NULL;
426
427		5914	filters += strspn(filters, WHITESPACES);
428
429	✗✓	5914	if ((ret = parse_sws_flags(&filters, graph)) < 0)
430			goto fail;
431
432			do {
433			AVFilterContext *filter;
434		11652	filters += strspn(filters, WHITESPACES);
435
436	✗✓	11652	if ((ret = parse_inputs(&filters, &curr_inputs, &open_outputs, graph)) < 0)
437			goto end;
438	✗✓	11652	if ((ret = parse_filter(&filter, &filters, graph, index, graph)) < 0)
439			goto end;
440
441
442	✗✓	11652	if ((ret = link_filter_inouts(filter, &curr_inputs, &open_inputs, graph)) < 0)
443			goto end;
444
445	✗✓	11652	if ((ret = parse_outputs(&filters, &curr_inputs, &open_inputs, &open_outputs,
446			graph)) < 0)
447			goto end;
448
449		11652	filters += strspn(filters, WHITESPACES);
450		11652	chr = *filters++;
451
452	✓✓✗✓	11652	if (chr == ';' && curr_inputs)
453			append_inout(&open_outputs, &curr_inputs);
454		11652	index++;
455	✓✓✓✓	11652	} while (chr == ',' \|\| chr == ';');
456
457	✗✓	5914	if (chr) {
458			av_log(graph, AV_LOG_ERROR,
459			"Unable to parse graph description substring: \"%s\"\n",
460			filters - 1);
461			ret = AVERROR(EINVAL);
462			goto end;
463			}
464
465		5914	append_inout(&open_outputs, &curr_inputs);
466
467
468		5914	*inputs = open_inputs;
469		5914	*outputs = open_outputs;
470		5914	return 0;
471
472			fail:end:
473			while (graph->nb_filters)
474			avfilter_free(graph->filters[0]);
475			av_freep(&graph->filters);
476			avfilter_inout_free(&open_inputs);
477			avfilter_inout_free(&open_outputs);
478			avfilter_inout_free(&curr_inputs);
479
480			*inputs = NULL;
481			*outputs = NULL;
482
483			return ret;
484			}
485
486			int avfilter_graph_parse(AVFilterGraph graph, const char filters,
487			AVFilterInOut *open_inputs,
488			AVFilterInOut open_outputs, void log_ctx)
489			{
490			int ret;
491			AVFilterInOut cur, match, inputs = NULL, outputs = NULL;
492
493			if ((ret = avfilter_graph_parse2(graph, filters, &inputs, &outputs)) < 0)
494			goto fail;
495
496			/* First input can be omitted if it is "[in]" */
497			if (inputs && !inputs->name)
498			inputs->name = av_strdup("in");
499			for (cur = inputs; cur; cur = cur->next) {
500			if (!cur->name) {
501			av_log(log_ctx, AV_LOG_ERROR,
502			"Not enough inputs specified for the \"%s\" filter.\n",
503			cur->filter_ctx->filter->name);
504			ret = AVERROR(EINVAL);
505			goto fail;
506			}
507			if (!(match = extract_inout(cur->name, &open_outputs)))
508			continue;
509			ret = avfilter_link(match->filter_ctx, match->pad_idx,
510			cur->filter_ctx, cur->pad_idx);
511			avfilter_inout_free(&match);
512			if (ret < 0)
513			goto fail;
514			}
515
516			/* Last output can be omitted if it is "[out]" */
517			if (outputs && !outputs->name)
518			outputs->name = av_strdup("out");
519			for (cur = outputs; cur; cur = cur->next) {
520			if (!cur->name) {
521			av_log(log_ctx, AV_LOG_ERROR,
522			"Invalid filterchain containing an unlabelled output pad: \"%s\"\n",
523			filters);
524			ret = AVERROR(EINVAL);
525			goto fail;
526			}
527			if (!(match = extract_inout(cur->name, &open_inputs)))
528			continue;
529			ret = avfilter_link(cur->filter_ctx, cur->pad_idx,
530			match->filter_ctx, match->pad_idx);
531			avfilter_inout_free(&match);
532			if (ret < 0)
533			goto fail;
534			}
535
536			fail:
537			if (ret < 0) {
538			while (graph->nb_filters)
539			avfilter_free(graph->filters[0]);
540			av_freep(&graph->filters);
541			}
542			avfilter_inout_free(&inputs);
543			avfilter_inout_free(&outputs);
544			avfilter_inout_free(&open_inputs);
545			avfilter_inout_free(&open_outputs);
546			return ret;
547			}
548
549		31	int avfilter_graph_parse_ptr(AVFilterGraph graph, const char filters,
550			AVFilterInOut open_inputs_ptr, AVFilterInOut open_outputs_ptr,
551			void *log_ctx)
552			{
553		31	int index = 0, ret = 0;
554		31	char chr = 0;
555
556		31	AVFilterInOut *curr_inputs = NULL;
557	✓✗	31	AVFilterInOut open_inputs = open_inputs_ptr ? open_inputs_ptr : NULL;
558	✓✗	31	AVFilterInOut open_outputs = open_outputs_ptr ? open_outputs_ptr : NULL;
559
560	✗✓	31	if ((ret = parse_sws_flags(&filters, graph)) < 0)
561			goto end;
562
563			do {
564			AVFilterContext *filter;
565		50	const char *filterchain = filters;
566		50	filters += strspn(filters, WHITESPACES);
567
568	✗✓	50	if ((ret = parse_inputs(&filters, &curr_inputs, &open_outputs, log_ctx)) < 0)
569			goto end;
570
571	✗✓	50	if ((ret = parse_filter(&filter, &filters, graph, index, log_ctx)) < 0)
572			goto end;
573
574	✓✓✗✓ ✗✗	50	if (filter->nb_inputs == 1 && !curr_inputs && !index) {
575			/* First input pad, assume it is "[in]" if not specified */
576			const char *tmp = "[in]";
577			if ((ret = parse_inputs(&tmp, &curr_inputs, &open_outputs, log_ctx)) < 0)
578			goto end;
579			}
580
581	✗✓	50	if ((ret = link_filter_inouts(filter, &curr_inputs, &open_inputs, log_ctx)) < 0)
582			goto end;
583
584	✗✓	50	if ((ret = parse_outputs(&filters, &curr_inputs, &open_inputs, &open_outputs,
585			log_ctx)) < 0)
586			goto end;
587
588		50	filters += strspn(filters, WHITESPACES);
589		50	chr = *filters++;
590
591	✓✓✗✓	50	if (chr == ';' && curr_inputs) {
592			av_log(log_ctx, AV_LOG_ERROR,
593			"Invalid filterchain containing an unlabelled output pad: \"%s\"\n",
594			filterchain);
595			ret = AVERROR(EINVAL);
596			goto end;
597			}
598		50	index++;
599	✓✓✓✓	50	} while (chr == ',' \|\| chr == ';');
600
601	✗✓	31	if (chr) {
602			av_log(log_ctx, AV_LOG_ERROR,
603			"Unable to parse graph description substring: \"%s\"\n",
604			filters - 1);
605			ret = AVERROR(EINVAL);
606			goto end;
607			}
608
609	✓✓	31	if (curr_inputs) {
610			/* Last output pad, assume it is "[out]" if not specified */
611		27	const char *tmp = "[out]";
612	✗✓	27	if ((ret = parse_outputs(&tmp, &curr_inputs, &open_inputs, &open_outputs,
613			log_ctx)) < 0)
614			goto end;
615			}
616
617		4	end:
618			/* clear open_in/outputs only if not passed as parameters */
619	✓✗	31	if (open_inputs_ptr) *open_inputs_ptr = open_inputs;
620			else avfilter_inout_free(&open_inputs);
621	✓✗	31	if (open_outputs_ptr) *open_outputs_ptr = open_outputs;
622			else avfilter_inout_free(&open_outputs);
623		31	avfilter_inout_free(&curr_inputs);
624
625	✗✓	31	if (ret < 0) {
626			while (graph->nb_filters)
627			avfilter_free(graph->filters[0]);
628			av_freep(&graph->filters);
629			}
630		31	return ret;
631			}