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Code Issues Releases Activity

avfilter/f_metadata: add support for file output

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Signed-off-by: Tobias Rapp <t.rapp@noa-archive.com>
This commit is contained in:
Tobias Rapp 2016-02-11 13:35:21 +01:00 committed by Paul B Mahol
parent 8b99c5e8da
commit 202f978728
2 changed files with 67 additions and 5 deletions
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6
doc/filters.texi
View File

@ -8526,6 +8526,12 @@ Float representation of @code{value} from metadata key.
@item VALUE2
Float representation of @code{value} as supplied by user in @code{value} option.
@end table
@item file
If specified in @code{print} mode, output is written to the named file. When
filename equals "-" data is written to standard output.
If @code{file} option is not set, output is written to the log with AV_LOG_INFO
loglevel.
@end table
@subsection Examples

66
libavfilter/f_metadata.c
View File

@ -81,8 +81,12 @@ typedef struct MetadataContext {
AVExpr *expr;
double var_values[VAR_VARS_NB];
FILE *file;
char *file_str;
int (*compare)(struct MetadataContext *s,
const char *value1, const char *value2, size_t length);
void (*print)(AVFilterContext *ctx, const char *msg, ...) av_printf_format(2, 3);
} MetadataContext;
#define OFFSET(x) offsetof(MetadataContext, x)
@ -104,6 +108,7 @@ static const AVOption filt_name##_options[] = { \
{ "expr", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = METADATAF_EXPR }, 0, 3, FLAGS, "function" }, \
{ "expr", "set expression for expr function", OFFSET(expr_str), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, FLAGS }, \
{ "length", "compare up to N chars for string function", OFFSET(length), AV_OPT_TYPE_INT, {.i64 = INT_MAX }, 1, INT_MAX, FLAGS }, \
{ "file", "set file where to print metadata information", OFFSET(file_str), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS }, \
{ NULL } \
}
@ -155,6 +160,27 @@ static int parse_expr(MetadataContext *s, const char *value1, const char *value2
return av_expr_eval(s->expr, s->var_values, NULL);
}
static void print_log(AVFilterContext *ctx, const char *msg, ...)
{
va_list argument_list;
va_start(argument_list, msg);
if (msg)
av_vlog(ctx, AV_LOG_INFO, msg, argument_list);
va_end(argument_list);
}
static void print_file(AVFilterContext *ctx, const char *msg, ...)
{
MetadataContext *s = ctx->priv;
va_list argument_list;
va_start(argument_list, msg);
if (msg)
vfprintf(s->file, msg, argument_list);
va_end(argument_list);
}
static av_cold int init(AVFilterContext *ctx)
{
MetadataContext *s = ctx->priv;
@ -203,9 +229,37 @@ static av_cold int init(AVFilterContext *ctx)
}
}
if (s->file_str) {
if (!strcmp(s->file_str, "-")) {
s->file = stdout;
} else {
s->file = fopen(s->file_str, "w");
if (!s->file) {
int err = AVERROR(errno);
char buf[128];
av_strerror(err, buf, sizeof(buf));
av_log(ctx, AV_LOG_ERROR, "Could not open file %s: %s\n",
s->file_str, buf);
return err;
}
}
s->print = print_file;
} else {
s->print = print_log;
}
return 0;
}
static av_cold void uninit(AVFilterContext *ctx)
{
MetadataContext *s = ctx->priv;
if (s->file && s->file != stdout)
fclose(s->file);
s->file = NULL;
}
static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
{
AVFilterContext *ctx = inlink->dst;
@ -245,14 +299,14 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
break;
case METADATA_PRINT:
if (!s->key && e) {
av_log(ctx, AV_LOG_INFO, "frame %"PRId64" pts %"PRId64"\n", inlink->frame_count, frame->pts);
av_log(ctx, AV_LOG_INFO, "%s=%s\n", e->key, e->value);
s->print(ctx, "frame %"PRId64" pts %"PRId64"\n", inlink->frame_count, frame->pts);
s->print(ctx, "%s=%s\n", e->key, e->value);
while ((e = av_dict_get(metadata, "", e, AV_DICT_IGNORE_SUFFIX)) != NULL) {
av_log(ctx, AV_LOG_INFO, "%s=%s\n", e->key, e->value);
s->print(ctx, "%s=%s\n", e->key, e->value);
}
} else if (e && e->value && (!s->value || (e->value && s->compare(s, e->value, s->value, s->length)))) {
av_log(ctx, AV_LOG_INFO, "frame %"PRId64" pts %"PRId64"\n", inlink->frame_count, frame->pts);
av_log(ctx, AV_LOG_INFO, "%s=%s\n", s->key, e->value);
s->print(ctx, "frame %"PRId64" pts %"PRId64"\n", inlink->frame_count, frame->pts);
s->print(ctx, "%s=%s\n", s->key, e->value);
}
return ff_filter_frame(outlink, frame);
break;
@ -301,6 +355,7 @@ AVFilter ff_af_ametadata = {
.priv_size = sizeof(MetadataContext),
.priv_class = &ametadata_class,
.init = init,
.uninit = uninit,
.query_formats = ff_query_formats_all,
.inputs = ainputs,
.outputs = aoutputs,
@ -336,6 +391,7 @@ AVFilter ff_vf_metadata = {
.priv_size = sizeof(MetadataContext),
.priv_class = &metadata_class,
.init = init,
.uninit = uninit,
.inputs = inputs,
.outputs = outputs,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,