ffmpeg: use a AVDictionary instead of the context to move swr parameters around

This avoids per parameter changes in ffmpeg at the cost of making access
somewhat more annoying.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

cmdutils.c

@@ -62,7 +62,7 @@
 static int init_report(const char *env);
 
 struct SwsContext *sws_opts;
-SwrContext *swr_opts;
+AVDictionary *swr_opts;
 AVDictionary *format_opts, *codec_opts, *resample_opts;
 
 const int this_year = 2013;
@@ -75,9 +75,6 @@ void init_opts(void)
     if(CONFIG_SWSCALE)
         sws_opts = sws_getContext(16, 16, 0, 16, 16, 0, SWS_BICUBIC,
                               NULL, NULL, NULL);
-
-    if(CONFIG_SWRESAMPLE)
-        swr_opts = swr_alloc();
 }
 
 void uninit_opts(void)
@@ -87,9 +84,7 @@ void uninit_opts(void)
     sws_opts = NULL;
 #endif
 
-    if(CONFIG_SWRESAMPLE)
-        swr_free(&swr_opts);
-
+    av_dict_free(&swr_opts);
     av_dict_free(&format_opts);
     av_dict_free(&codec_opts);
     av_dict_free(&resample_opts);
@@ -518,13 +513,16 @@ int opt_default(void *optctx, const char *opt, const char *arg)
 #endif
 #if CONFIG_SWRESAMPLE
     swr_class = swr_get_class();
-    if (!consumed && av_opt_find(&swr_class, opt, NULL, 0,
-                               AV_OPT_SEARCH_CHILDREN | AV_OPT_SEARCH_FAKE_OBJ)) {
-        int ret = av_opt_set(swr_opts, opt, arg, 0);
+    if (!consumed && (o=av_opt_find(&swr_class, opt, NULL, 0,
+                                    AV_OPT_SEARCH_CHILDREN | AV_OPT_SEARCH_FAKE_OBJ))) {
+        struct SwrContext *swr = swr_alloc();
+        int ret = av_opt_set(swr, opt, arg, 0);
+        swr_free(&swr);
         if (ret < 0) {
             av_log(NULL, AV_LOG_ERROR, "Error setting option %s.\n", opt);
             return ret;
         }
+        av_dict_set(&swr_opts, opt, arg, FLAGS);
         consumed = 1;
     }
 #endif
@@ -651,8 +649,7 @@ void uninit_parse_context(OptionParseContext *octx)
 #if CONFIG_SWSCALE
             sws_freeContext(l->groups[j].sws_opts);
 #endif
-            if(CONFIG_SWRESAMPLE)
-                swr_free(&l->groups[j].swr_opts);
+            av_dict_free(&l->groups[j].swr_opts);
         }
         av_freep(&l->groups);
     }

cmdutils.h

@@ -51,7 +51,7 @@ extern const int this_year;
 extern AVCodecContext *avcodec_opts[AVMEDIA_TYPE_NB];
 extern AVFormatContext *avformat_opts;
 extern struct SwsContext *sws_opts;
-extern struct SwrContext *swr_opts;
+extern AVDictionary *swr_opts;
 extern AVDictionary *format_opts, *codec_opts, *resample_opts;
 
 /**
@@ -255,7 +255,7 @@ typedef struct OptionGroup {
     AVDictionary *format_opts;
     AVDictionary *resample_opts;
     struct SwsContext *sws_opts;
-    struct SwrContext *swr_opts;
+    AVDictionary *swr_opts;
 } OptionGroup;
 
 /**

ffmpeg.c

@@ -3212,6 +3212,7 @@ static int transcode(void)
                 av_freep(&ost->st->codec->subtitle_header);
                 av_free(ost->forced_kf_pts);
                 av_dict_free(&ost->opts);
+                av_dict_free(&ost->swr_opts);
                 av_dict_free(&ost->resample_opts);
             }
         }

ffmpeg.h

@@ -346,10 +346,8 @@ typedef struct OutputStream {
     char *avfilter;
 
     int64_t sws_flags;
-    int64_t swr_filter_type;
-    int64_t swr_dither_method;
-    double swr_dither_scale;
     AVDictionary *opts;
+    AVDictionary *swr_opts;
     AVDictionary *resample_opts;
     int finished;        /* no more packets should be written for this stream */
     int unavailable;                     /* true if the steram is unavailable (possibly temporarily) */

ffmpeg_filter.c

@@ -739,12 +739,10 @@ int configure_filtergraph(FilterGraph *fg)
         fg->graph->scale_sws_opts = av_strdup(args);
 
         args[0] = 0;
-        if (ost->swr_filter_type != SWR_FILTER_TYPE_KAISER)
-            av_strlcatf(args, sizeof(args), "filter_type=%d:", (int)ost->swr_filter_type);
-        if (ost->swr_dither_method)
-            av_strlcatf(args, sizeof(args), "dither_method=%d:", (int)ost->swr_dither_method);
-        if (ost->swr_dither_scale != 1.0)
-            av_strlcatf(args, sizeof(args), "dither_scale=%f:", ost->swr_dither_scale);
+        while ((e = av_dict_get(ost->swr_opts, "", e,
+                                AV_DICT_IGNORE_SUFFIX))) {
+            av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
+        }
         if (strlen(args))
             args[strlen(args)-1] = 0;
         av_opt_set(fg->graph, "aresample_swr_opts", args, 0);

ffmpeg_opt.c

@@ -1002,11 +1002,10 @@ static OutputStream *new_output_stream(OptionsContext *o, AVFormatContext *oc, e
         st->codec->flags |= CODEC_FLAG_GLOBAL_HEADER;
 
     av_opt_get_int(o->g->sws_opts, "sws_flags", 0, &ost->sws_flags);
-    av_opt_get_int   (o->g->swr_opts, "filter_type"  , 0, &ost->swr_filter_type);
-    av_opt_get_int   (o->g->swr_opts, "dither_method", 0, &ost->swr_dither_method);
-    av_opt_get_double(o->g->swr_opts, "dither_scale" , 0, &ost->swr_dither_scale);
+
+    av_dict_copy(&ost->swr_opts, o->g->swr_opts, 0);
     if (ost->enc && av_get_exact_bits_per_sample(ost->enc->id) == 24)
-        ost->swr_dither_scale = ost->swr_dither_scale*256;
+        av_dict_set(&ost->swr_opts, "output_sample_bits", "24", 0);
 
     av_dict_copy(&ost->resample_opts, o->g->resample_opts, 0);