avformat/hdsenc: Add explicit deinit function

hdsenc already had an explicit function to free all allocations in case
of an error, but it was not marked as deinit function, so that it was
not called automatically when the AVFormatContext for muxing gets freed.

Using an explicit deinit function also makes the code cleaner by
allowing to return immediately without "goto fail".
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>

libavformat/hdsenc.c

@@ -317,21 +317,18 @@ static int hds_write_header(AVFormatContext *s)
     ff_const59 AVOutputFormat *oformat;
 
     if (mkdir(s->url, 0777) == -1 && errno != EEXIST) {
-        ret = AVERROR(errno);
         av_log(s, AV_LOG_ERROR , "Failed to create directory %s\n", s->url);
-        goto fail;
+        return AVERROR(errno);
     }
 
     oformat = av_guess_format("flv", NULL, NULL);
     if (!oformat) {
-        ret = AVERROR_MUXER_NOT_FOUND;
-        goto fail;
+        return AVERROR_MUXER_NOT_FOUND;
     }
 
     c->streams = av_mallocz_array(s->nb_streams, sizeof(*c->streams));
     if (!c->streams) {
-        ret = AVERROR(ENOMEM);
-        goto fail;
+        return AVERROR(ENOMEM);
     }
 
     for (i = 0; i < s->nb_streams; i++) {
@@ -341,8 +338,7 @@ static int hds_write_header(AVFormatContext *s)
 
         if (!st->codecpar->bit_rate) {
             av_log(s, AV_LOG_ERROR, "No bit rate set for stream %d\n", i);
-            ret = AVERROR(EINVAL);
-            goto fail;
+            return AVERROR(EINVAL);
         }
         if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
             if (os->has_video) {
@@ -358,8 +354,7 @@ static int hds_write_header(AVFormatContext *s)
             os->has_audio = 1;
         } else {
             av_log(s, AV_LOG_ERROR, "Unsupported stream type in stream %d\n", i);
-            ret = AVERROR(EINVAL);
-            goto fail;
+            return AVERROR(EINVAL);
         }
         os->bitrate += s->streams[i]->codecpar->bit_rate;
 
@@ -367,8 +362,7 @@ static int hds_write_header(AVFormatContext *s)
             os->first_stream = i;
             ctx = avformat_alloc_context();
             if (!ctx) {
-                ret = AVERROR(ENOMEM);
-                goto fail;
+                return AVERROR(ENOMEM);
             }
             os->ctx = ctx;
             ctx->oformat = oformat;
@@ -379,8 +373,7 @@ static int hds_write_header(AVFormatContext *s)
                                          AVIO_FLAG_WRITE, os,
                                          NULL, hds_write, NULL);
             if (!ctx->pb) {
-                ret = AVERROR(ENOMEM);
-                goto fail;
+                return AVERROR(ENOMEM);
             }
         } else {
             ctx = os->ctx;
@@ -388,8 +381,7 @@ static int hds_write_header(AVFormatContext *s)
         s->streams[i]->id = c->nb_streams;
 
         if (!(st = avformat_new_stream(ctx, NULL))) {
-            ret = AVERROR(ENOMEM);
-            goto fail;
+            return AVERROR(ENOMEM);
         }
         avcodec_parameters_copy(st->codecpar, s->streams[i]->codecpar);
         st->codecpar->codec_tag = 0;
@@ -403,7 +395,7 @@ static int hds_write_header(AVFormatContext *s)
         OutputStream *os = &c->streams[i];
         int j;
         if ((ret = avformat_write_header(os->ctx, NULL)) < 0) {
-             goto fail;
+             return ret;
         }
         os->ctx_inited = 1;
         avio_flush(os->ctx->pb);
@@ -414,7 +406,7 @@ static int hds_write_header(AVFormatContext *s)
                  "%s/stream%d_temp", s->url, i);
         ret = init_file(s, os, 0);
         if (ret < 0)
-            goto fail;
+            return ret;
 
         if (!os->has_video && c->min_frag_duration <= 0) {
             av_log(s, AV_LOG_WARNING,
@@ -425,9 +417,6 @@ static int hds_write_header(AVFormatContext *s)
     }
     ret = write_manifest(s, 0);
 
-fail:
-    if (ret)
-        hds_free(s);
     return ret;
 }
 
@@ -557,7 +546,6 @@ static int hds_write_trailer(AVFormatContext *s)
         rmdir(s->url);
     }
 
-    hds_free(s);
     return 0;
 }
 
@@ -588,5 +576,6 @@ AVOutputFormat ff_hds_muxer = {
     .write_header   = hds_write_header,
     .write_packet   = hds_write_packet,
     .write_trailer  = hds_write_trailer,
+    .deinit         = hds_free,
     .priv_class     = &hds_class,
 };