avformat/utils: Move ff_stream_add_bitstream_filter to mux.c

It is muxing-only; in fact, it should be considered part of
the core muxing code.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

1 files changed, 43 insertions, 0 deletions

diff --git a/libavformat/mux.c b/libavformat/mux.c
index 11b0cb1307..31361f9b46 100644
--- a/libavformat/mux.c
+++ b/libavformat/mux.c
@@ -1304,6 +1304,49 @@ int av_get_output_timestamp(struct AVFormatContext *s, int stream,
     return 0;
 }
 
+int ff_stream_add_bitstream_filter(AVStream *st, const char *name, const char *args)
+{
+    int ret;
+    const AVBitStreamFilter *bsf;
+    FFStream *const sti = ffstream(st);
+    AVBSFContext *bsfc;
+
+    av_assert0(!sti->bsfc);
+
+    if (!(bsf = av_bsf_get_by_name(name))) {
+        av_log(NULL, AV_LOG_ERROR, "Unknown bitstream filter '%s'\n", name);
+        return AVERROR_BSF_NOT_FOUND;
+    }
+
+    if ((ret = av_bsf_alloc(bsf, &bsfc)) < 0)
+        return ret;
+
+    bsfc->time_base_in = st->time_base;
+    if ((ret = avcodec_parameters_copy(bsfc->par_in, st->codecpar)) < 0) {
+        av_bsf_free(&bsfc);
+        return ret;
+    }
+
+    if (args && bsfc->filter->priv_class) {
+        if ((ret = av_set_options_string(bsfc->priv_data, args, "=", ":")) < 0) {
+            av_bsf_free(&bsfc);
+            return ret;
+        }
+    }
+
+    if ((ret = av_bsf_init(bsfc)) < 0) {
+        av_bsf_free(&bsfc);
+        return ret;
+    }
+
+    sti->bsfc = bsfc;
+
+    av_log(NULL, AV_LOG_VERBOSE,
+           "Automatically inserted bitstream filter '%s'; args='%s'\n",
+           name, args ? args : "");
+    return 1;
+}
+
 int ff_write_chained(AVFormatContext *dst, int dst_stream, AVPacket *pkt,
                      AVFormatContext *src, int interleave)
 {