mirror of
https://github.com/FFmpeg/FFmpeg.git
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lavfi/graphparser: reimplement avfilter_graph_parse* using new API
This commit is contained in:
Anton Khirnov
parent
d1b9a3ddb4
commit
f17051eaae
@ -33,26 +33,6 @@
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#define WHITESPACES " \n\t\r"
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/**
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* Link two filters together.
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*
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* @see avfilter_link()
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*/
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static int link_filter(AVFilterContext *src, int srcpad,
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AVFilterContext *dst, int dstpad,
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void *log_ctx)
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{
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int ret;
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if ((ret = avfilter_link(src, srcpad, dst, dstpad))) {
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av_log(log_ctx, AV_LOG_ERROR,
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"Cannot create the link %s:%d -> %s:%d\n",
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src->filter->name, srcpad, dst->filter->name, dstpad);
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return ret;
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}
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return 0;
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}
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/**
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* Parse the name of a link, which has the format "[linkname]".
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*
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@ -87,119 +67,6 @@ static char *parse_link_name(const char **buf, void *log_ctx)
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return name;
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}
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/**
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* Create an instance of a filter, initialize and insert it in the
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* filtergraph in *ctx.
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*
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* @param filt_ctx put here a filter context in case of successful creation and configuration, NULL otherwise.
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* @param ctx the filtergraph context
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* @param index an index which is supposed to be unique for each filter instance added to the filtergraph
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* @param name the name of the filter to create, can be filter name or filter_name\@id as instance name
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* @param args the arguments provided to the filter during its initialization
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* @param log_ctx the log context to use
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* @return >= 0 in case of success, a negative AVERROR code otherwise
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*/
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static int create_filter(AVFilterContext **filt_ctx, AVFilterGraph *ctx, int index,
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const char *name, const char *args, void *log_ctx)
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{
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const AVFilter *filt;
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char name2[30];
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const char *inst_name = NULL, *filt_name = NULL;
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int ret, k;
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av_strlcpy(name2, name, sizeof(name2));
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for (k = 0; name2[k]; k++) {
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if (name2[k] == '@' && name[k+1]) {
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name2[k] = 0;
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inst_name = name;
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filt_name = name2;
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break;
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}
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}
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if (!inst_name) {
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snprintf(name2, sizeof(name2), "Parsed_%s_%d", name, index);
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inst_name = name2;
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filt_name = name;
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}
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filt = avfilter_get_by_name(filt_name);
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if (!filt) {
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av_log(log_ctx, AV_LOG_ERROR,
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"No such filter: '%s'\n", filt_name);
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return AVERROR(EINVAL);
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}
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*filt_ctx = avfilter_graph_alloc_filter(ctx, filt, inst_name);
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if (!*filt_ctx) {
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av_log(log_ctx, AV_LOG_ERROR,
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"Error creating filter '%s'\n", filt_name);
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return AVERROR(ENOMEM);
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}
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if (!strcmp(filt_name, "scale") && ctx->scale_sws_opts) {
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ret = av_set_options_string(*filt_ctx, ctx->scale_sws_opts, "=", ":");
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if (ret < 0)
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return ret;
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}
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ret = avfilter_init_str(*filt_ctx, args);
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if (ret < 0) {
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av_log(log_ctx, AV_LOG_ERROR,
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"Error initializing filter '%s'", filt_name);
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if (args)
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av_log(log_ctx, AV_LOG_ERROR, " with args '%s'", args);
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av_log(log_ctx, AV_LOG_ERROR, "\n");
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avfilter_free(*filt_ctx);
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*filt_ctx = NULL;
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}
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return ret;
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}
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/**
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* Parse a string of the form FILTER_NAME[=PARAMS], and create a
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* corresponding filter instance which is added to graph with
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* create_filter().
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*
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* @param filt_ctx Pointer that is set to the created and configured filter
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* context on success, set to NULL on failure.
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* @param filt_ctx put here a pointer to the created filter context on
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* success, NULL otherwise
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* @param buf pointer to the buffer to parse, *buf will be updated to
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* point to the char next after the parsed string
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* @param index an index which is assigned to the created filter
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* instance, and which is supposed to be unique for each filter
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* instance added to the filtergraph
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* @return >= 0 in case of success, a negative AVERROR code otherwise
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*/
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static int parse_filter(AVFilterContext **filt_ctx, const char **buf, AVFilterGraph *graph,
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int index, void *log_ctx)
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{
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char *opts = NULL;
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char *name = av_get_token(buf, "=,;[");
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int ret;
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if (!name)
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return AVERROR(ENOMEM);
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if (**buf == '=') {
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(*buf)++;
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opts = av_get_token(buf, "[],;");
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if (!opts) {
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av_free(name);
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return AVERROR(ENOMEM);
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}
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}
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ret = create_filter(filt_ctx, graph, index, name, opts, log_ctx);
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av_free(name);
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av_free(opts);
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return ret;
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}
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AVFilterInOut *avfilter_inout_alloc(void)
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{
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return av_mallocz(sizeof(AVFilterInOut));
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@ -232,12 +99,6 @@ static AVFilterInOut *extract_inout(const char *label, AVFilterInOut **links)
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return ret;
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}
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static void insert_inout(AVFilterInOut **inouts, AVFilterInOut *element)
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{
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element->next = *inouts;
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*inouts = element;
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}
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static void append_inout(AVFilterInOut **inouts, AVFilterInOut **element)
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{
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while (*inouts && (*inouts)->next)
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@ -250,144 +111,6 @@ static void append_inout(AVFilterInOut **inouts, AVFilterInOut **element)
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*element = NULL;
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}
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static int link_filter_inouts(AVFilterContext *filt_ctx,
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AVFilterInOut **curr_inputs,
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AVFilterInOut **open_inputs, void *log_ctx)
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{
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int pad, ret;
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for (pad = 0; pad < filt_ctx->nb_inputs; pad++) {
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AVFilterInOut *p = *curr_inputs;
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if (p) {
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*curr_inputs = (*curr_inputs)->next;
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p->next = NULL;
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} else if (!(p = av_mallocz(sizeof(*p))))
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return AVERROR(ENOMEM);
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if (p->filter_ctx) {
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ret = link_filter(p->filter_ctx, p->pad_idx, filt_ctx, pad, log_ctx);
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av_freep(&p->name);
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av_freep(&p);
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if (ret < 0)
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return ret;
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} else {
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p->filter_ctx = filt_ctx;
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p->pad_idx = pad;
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append_inout(open_inputs, &p);
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}
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}
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if (*curr_inputs) {
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av_log(log_ctx, AV_LOG_ERROR,
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"Too many inputs specified for the \"%s\" filter.\n",
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filt_ctx->filter->name);
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return AVERROR(EINVAL);
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}
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pad = filt_ctx->nb_outputs;
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while (pad--) {
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AVFilterInOut *currlinkn = av_mallocz(sizeof(AVFilterInOut));
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if (!currlinkn)
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return AVERROR(ENOMEM);
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currlinkn->filter_ctx = filt_ctx;
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currlinkn->pad_idx = pad;
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insert_inout(curr_inputs, currlinkn);
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}
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return 0;
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}
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static int parse_inputs(const char **buf, AVFilterInOut **curr_inputs,
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AVFilterInOut **open_outputs, void *log_ctx)
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{
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AVFilterInOut *parsed_inputs = NULL;
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int pad = 0;
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while (**buf == '[') {
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char *name = parse_link_name(buf, log_ctx);
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AVFilterInOut *match;
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if (!name) {
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avfilter_inout_free(&parsed_inputs);
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return AVERROR(EINVAL);
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}
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/* First check if the label is not in the open_outputs list */
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match = extract_inout(name, open_outputs);
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if (match) {
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av_free(name);
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} else {
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/* Not in the list, so add it as an input */
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if (!(match = av_mallocz(sizeof(AVFilterInOut)))) {
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avfilter_inout_free(&parsed_inputs);
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av_free(name);
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return AVERROR(ENOMEM);
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}
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match->name = name;
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match->pad_idx = pad;
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}
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append_inout(&parsed_inputs, &match);
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*buf += strspn(*buf, WHITESPACES);
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pad++;
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}
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append_inout(&parsed_inputs, curr_inputs);
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*curr_inputs = parsed_inputs;
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return pad;
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}
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static int parse_outputs(const char **buf, AVFilterInOut **curr_inputs,
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AVFilterInOut **open_inputs,
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AVFilterInOut **open_outputs, void *log_ctx)
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{
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int ret, pad = 0;
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while (**buf == '[') {
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char *name = parse_link_name(buf, log_ctx);
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AVFilterInOut *match;
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AVFilterInOut *input = *curr_inputs;
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if (!name)
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return AVERROR(EINVAL);
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if (!input) {
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av_log(log_ctx, AV_LOG_ERROR,
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"No output pad can be associated to link label '%s'.\n", name);
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av_free(name);
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return AVERROR(EINVAL);
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}
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*curr_inputs = (*curr_inputs)->next;
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/* First check if the label is not in the open_inputs list */
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match = extract_inout(name, open_inputs);
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if (match) {
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ret = link_filter(input->filter_ctx, input->pad_idx,
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match->filter_ctx, match->pad_idx, log_ctx);
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av_freep(&match->name);
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av_freep(&name);
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av_freep(&match);
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av_freep(&input);
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if (ret < 0)
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return ret;
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} else {
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/* Not in the list, so add the first input as an open_output */
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input->name = name;
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insert_inout(open_outputs, input);
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}
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*buf += strspn(*buf, WHITESPACES);
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pad++;
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}
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return pad;
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}
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static int parse_sws_flags(const char **buf, char **dst, void *log_ctx)
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{
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char *p = strchr(*buf, ';');
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@ -415,66 +138,24 @@ int avfilter_graph_parse2(AVFilterGraph *graph, const char *filters,
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AVFilterInOut **inputs,
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AVFilterInOut **outputs)
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{
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int index = 0, ret = 0;
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char chr = 0;
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AVFilterGraphSegment *seg;
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int ret;
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AVFilterInOut *curr_inputs = NULL, *open_inputs = NULL, *open_outputs = NULL;
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ret = avfilter_graph_segment_parse(graph, filters, 0, &seg);
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if (ret < 0)
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return ret;
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filters += strspn(filters, WHITESPACES);
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if ((ret = parse_sws_flags(&filters, &graph->scale_sws_opts, graph)) < 0)
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ret = avfilter_graph_segment_apply(seg, 0, inputs, outputs);
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avfilter_graph_segment_free(&seg);
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if (ret < 0)
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goto end;
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do {
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AVFilterContext *filter;
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filters += strspn(filters, WHITESPACES);
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if ((ret = parse_inputs(&filters, &curr_inputs, &open_outputs, graph)) < 0)
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goto end;
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if ((ret = parse_filter(&filter, &filters, graph, index, graph)) < 0)
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goto end;
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if ((ret = link_filter_inouts(filter, &curr_inputs, &open_inputs, graph)) < 0)
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goto end;
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if ((ret = parse_outputs(&filters, &curr_inputs, &open_inputs, &open_outputs,
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graph)) < 0)
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goto end;
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filters += strspn(filters, WHITESPACES);
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chr = *filters++;
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if (chr == ';' && curr_inputs)
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append_inout(&open_outputs, &curr_inputs);
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index++;
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} while (chr == ',' || chr == ';');
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if (chr) {
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av_log(graph, AV_LOG_ERROR,
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"Unable to parse graph description substring: \"%s\"\n",
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filters - 1);
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ret = AVERROR(EINVAL);
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goto end;
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}
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append_inout(&open_outputs, &curr_inputs);
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*inputs = open_inputs;
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*outputs = open_outputs;
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return 0;
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end:
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while (graph->nb_filters)
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avfilter_free(graph->filters[0]);
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av_freep(&graph->filters);
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avfilter_inout_free(&open_inputs);
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avfilter_inout_free(&open_outputs);
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avfilter_inout_free(&curr_inputs);
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*inputs = NULL;
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*outputs = NULL;
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return ret;
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}
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@ -542,90 +223,6 @@ int avfilter_graph_parse(AVFilterGraph *graph, const char *filters,
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return ret;
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}
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int avfilter_graph_parse_ptr(AVFilterGraph *graph, const char *filters,
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AVFilterInOut **open_inputs_ptr, AVFilterInOut **open_outputs_ptr,
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void *log_ctx)
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{
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int index = 0, ret = 0;
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char chr = 0;
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AVFilterInOut *curr_inputs = NULL;
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AVFilterInOut *open_inputs = open_inputs_ptr ? *open_inputs_ptr : NULL;
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AVFilterInOut *open_outputs = open_outputs_ptr ? *open_outputs_ptr : NULL;
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if ((ret = parse_sws_flags(&filters, &graph->scale_sws_opts, graph)) < 0)
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goto end;
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do {
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AVFilterContext *filter;
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const char *filterchain = filters;
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filters += strspn(filters, WHITESPACES);
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if ((ret = parse_inputs(&filters, &curr_inputs, &open_outputs, log_ctx)) < 0)
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goto end;
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if ((ret = parse_filter(&filter, &filters, graph, index, log_ctx)) < 0)
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goto end;
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if (filter->nb_inputs == 1 && !curr_inputs && !index) {
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/* First input pad, assume it is "[in]" if not specified */
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const char *tmp = "[in]";
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if ((ret = parse_inputs(&tmp, &curr_inputs, &open_outputs, log_ctx)) < 0)
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goto end;
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}
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if ((ret = link_filter_inouts(filter, &curr_inputs, &open_inputs, log_ctx)) < 0)
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goto end;
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if ((ret = parse_outputs(&filters, &curr_inputs, &open_inputs, &open_outputs,
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log_ctx)) < 0)
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goto end;
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filters += strspn(filters, WHITESPACES);
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chr = *filters++;
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if (chr == ';' && curr_inputs) {
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av_log(log_ctx, AV_LOG_ERROR,
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"Invalid filterchain containing an unlabelled output pad: \"%s\"\n",
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filterchain);
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ret = AVERROR(EINVAL);
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goto end;
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}
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index++;
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} while (chr == ',' || chr == ';');
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if (chr) {
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av_log(log_ctx, AV_LOG_ERROR,
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"Unable to parse graph description substring: \"%s\"\n",
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filters - 1);
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ret = AVERROR(EINVAL);
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goto end;
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}
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if (curr_inputs) {
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/* Last output pad, assume it is "[out]" if not specified */
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const char *tmp = "[out]";
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if ((ret = parse_outputs(&tmp, &curr_inputs, &open_inputs, &open_outputs,
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log_ctx)) < 0)
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goto end;
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}
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end:
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/* clear open_in/outputs only if not passed as parameters */
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if (open_inputs_ptr) *open_inputs_ptr = open_inputs;
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else avfilter_inout_free(&open_inputs);
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if (open_outputs_ptr) *open_outputs_ptr = open_outputs;
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else avfilter_inout_free(&open_outputs);
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avfilter_inout_free(&curr_inputs);
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if (ret < 0) {
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while (graph->nb_filters)
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avfilter_free(graph->filters[0]);
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av_freep(&graph->filters);
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}
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return ret;
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}
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static void pad_params_free(AVFilterPadParams **pfpp)
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{
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AVFilterPadParams *fpp = *pfpp;
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@ -1288,3 +885,121 @@ int avfilter_graph_segment_apply(AVFilterGraphSegment *seg, int flags,
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return 0;
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}
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int avfilter_graph_parse_ptr(AVFilterGraph *graph, const char *filters,
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AVFilterInOut **open_inputs_ptr, AVFilterInOut **open_outputs_ptr,
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void *log_ctx)
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{
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AVFilterInOut *user_inputs = open_inputs_ptr ? *open_inputs_ptr : NULL;
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AVFilterInOut *user_outputs = open_outputs_ptr ? *open_outputs_ptr : NULL;
|
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AVFilterInOut *inputs = NULL, *outputs = NULL;
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AVFilterGraphSegment *seg = NULL;
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||||
AVFilterChain *ch;
|
||||
AVFilterParams *p;
|
||||
int ret;
|
||||
|
||||
ret = avfilter_graph_segment_parse(graph, filters, 0, &seg);
|
||||
if (ret < 0)
|
||||
goto end;
|
||||
|
||||
ret = avfilter_graph_segment_create_filters(seg, 0);
|
||||
if (ret < 0)
|
||||
goto end;
|
||||
|
||||
ret = avfilter_graph_segment_apply_opts(seg, 0);
|
||||
if (ret < 0)
|
||||
goto end;
|
||||
|
||||
ret = avfilter_graph_segment_init(seg, 0);
|
||||
if (ret < 0)
|
||||
goto end;
|
||||
|
||||
/* First input pad, assume it is "[in]" if not specified */
|
||||
p = seg->chains[0]->filters[0];
|
||||
if (p->filter->nb_inputs == 1 && !p->inputs) {
|
||||
const char *tmp = "[in]";
|
||||
|
||||
ret = linklabels_parse(graph, &tmp, &p->inputs, &p->nb_inputs);
|
||||
if (ret < 0)
|
||||
goto end;
|
||||
}
|
||||
|
||||
/* Last output pad, assume it is "[out]" if not specified */
|
||||
ch = seg->chains[seg->nb_chains - 1];
|
||||
p = ch->filters[ch->nb_filters - 1];
|
||||
if (p->filter->nb_outputs == 1 && !p->outputs) {
|
||||
const char *tmp = "[out]";
|
||||
|
||||
ret = linklabels_parse(graph, &tmp, &p->outputs, &p->nb_outputs);
|
||||
if (ret < 0)
|
||||
goto end;
|
||||
}
|
||||
|
||||
ret = avfilter_graph_segment_apply(seg, 0, &inputs, &outputs);
|
||||
avfilter_graph_segment_free(&seg);
|
||||
if (ret < 0)
|
||||
goto end;
|
||||
|
||||
// process user-supplied inputs/outputs
|
||||
while (inputs) {
|
||||
AVFilterInOut *cur, *match = NULL;
|
||||
|
||||
cur = inputs;
|
||||
inputs = cur->next;
|
||||
cur->next = NULL;
|
||||
|
||||
if (cur->name)
|
||||
match = extract_inout(cur->name, &user_outputs);
|
||||
|
||||
if (match) {
|
||||
ret = avfilter_link(match->filter_ctx, match->pad_idx,
|
||||
cur->filter_ctx, cur->pad_idx);
|
||||
avfilter_inout_free(&match);
|
||||
avfilter_inout_free(&cur);
|
||||
if (ret < 0)
|
||||
goto end;
|
||||
} else
|
||||
append_inout(&user_inputs, &cur);
|
||||
}
|
||||
while (outputs) {
|
||||
AVFilterInOut *cur, *match = NULL;
|
||||
|
||||
cur = outputs;
|
||||
outputs = cur->next;
|
||||
cur->next = NULL;
|
||||
|
||||
if (cur->name)
|
||||
match = extract_inout(cur->name, &user_inputs);
|
||||
|
||||
if (match) {
|
||||
ret = avfilter_link(cur->filter_ctx, cur->pad_idx,
|
||||
match->filter_ctx, match->pad_idx);
|
||||
avfilter_inout_free(&match);
|
||||
avfilter_inout_free(&cur);
|
||||
if (ret < 0)
|
||||
goto end;
|
||||
} else
|
||||
append_inout(&user_outputs, &cur);
|
||||
}
|
||||
|
||||
end:
|
||||
avfilter_graph_segment_free(&seg);
|
||||
|
||||
if (ret < 0) {
|
||||
while (graph->nb_filters)
|
||||
avfilter_free(graph->filters[0]);
|
||||
av_freep(&graph->filters);
|
||||
}
|
||||
|
||||
/* clear open_in/outputs only if not passed as parameters */
|
||||
if (open_inputs_ptr) *open_inputs_ptr = user_inputs;
|
||||
else avfilter_inout_free(&user_inputs);
|
||||
if (open_outputs_ptr) *open_outputs_ptr = user_outputs;
|
||||
else avfilter_inout_free(&user_outputs);
|
||||
|
||||
avfilter_inout_free(&inputs);
|
||||
avfilter_inout_free(&outputs);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user