---
libavformat/avformat.h | 30 ++++++++++++++++++++++
libavformat/mux.c | 67 ++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 97 insertions(+)
diff --git a/libavformat/avformat.h b/libavformat/avformat.h
index f28186f..4449314 100644
--- a/libavformat/avformat.h
+++ b/libavformat/avformat.h
@@ -1613,6 +1613,36 @@ void avformat_close_input(AVFormatContext **s);
* @addtogroup lavf_encoding
* @{
*/
+
+/**
+ * Open prepare an output AVFormatContext so it can be passed to
+ * avformat_write_header(). Internally avformat_alloc_context() and
+ * avio_open2() will be called.
+ *
+ * @param ps Pointer to user-supplied AVFormatContext allocated by
+ * avformat_alloc_context().
+ * May be a pointer to NULL, in which case an AVFormatContext
+ * is allocated by this function and written into ps.
+ * @note The user-supplied AVFormatContext will be freed
+ * on failure. If the supplied context provides the
+ * AVIOContext, it will be freed as well.
+ * @param filename Name of the file to create or open.
+ * @param fmt If non-NULL, this parameter forces a specific input
+ * format, otherwise the format is autodetected.
+ * @param options An AVDictionary filled with AVIOContext and protocol-private
+ * options.
+ * On return this parameter will be destroyed and replaced
+ * with a dict containing options that were not found.
+ * May be NULL.
+ *
+ * @return 0 on success, negative AVERROR on failure.
+ *
+ * @see av_opt_find, av_dict_set, avio_open2, avformat_write_header()
+ */
+
+int avformat_open_output(AVFormatContext **ps, const char *filename,
+ AVOutputFormat *fmt, AVDictionary **options);
+
/**
* Allocate the stream private data and write the stream header to
* an output media file.
diff --git a/libavformat/mux.c b/libavformat/mux.c
index 4067c16..6ce273e 100644
--- a/libavformat/mux.c
+++ b/libavformat/mux.c
@@ -235,6 +235,73 @@ fail:
return ret;
}
+int avformat_open_output(AVFormatContext **ps, const char *filename,
+ AVOutputFormat *fmt,
+ AVDictionary **options)
+{
+ AVFormatContext *s = *ps;
+ int ret = 0;
+ AVDictionary *tmp = NULL;
+
+ if (!s && !(s = avformat_alloc_context()))
+ return AVERROR(ENOMEM);
+
+ if (fmt)
+ s->oformat = fmt;
+ else
+ s->oformat = av_guess_format(NULL, filename, NULL);
+
+ if (!s->oformat) {
+ av_log(s, AV_LOG_ERROR,
+ "Unable to find a suitable output format for %s\n",
+ filename);
+ ret = AVERROR(EINVAL);
+ goto fail;
+ }
+
+ if (s->oformat->flags & AVFMT_NEEDNUMBER) {
+ if (!av_filename_number_test(filename)) {
+ ret = AVERROR(EINVAL);
+ goto fail;
+ }
+ }
+
+ av_strlcpy(s->filename, filename, sizeof(s->filename));
+
+ if (options)
+ av_dict_copy(&tmp, *options, 0);
+
+ if ((ret = av_opt_set_dict(s, &tmp)) < 0)
+ goto fail;
+
+ if (!(s->oformat->flags & AVFMT_NOFILE) && !s->pb) {
+ av_dict_set(&tmp, "content_type", s->oformat->mime_type,
+ AV_DICT_DONT_OVERWRITE);
+
+ if ((ret = avio_open2(&s->pb, filename, AVIO_FLAG_WRITE,
+ &s->interrupt_callback,
+ &tmp)) < 0) {
+ goto fail;
+ }
+ }
+
+ if (options) {
+ av_dict_free(options);
+ *options = tmp;
+ }
+
+ *ps = s;
+
+ return 0;
+
+fail:
+ av_dict_free(&tmp);
+ avio_close(s->pb);
+ avformat_free_context(s);
+ *ps = NULL;
+ return ret;
+}
+
int avformat_write_header(AVFormatContext *s, AVDictionary **options)
{
int ret = 0;
--
2.1.0
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