ffmpeg: make -map_metadata work consistently with the other options

Before, it took an input and output file index, now it only takes an
input file and applies to the next output file.

Stream/chapter/program specification is now part of the option name and
the delimiter was changed from ',' to ':' to be consistent with the
similar feature for AVOptions.

ffmpeg.c

@@ -2206,10 +2206,6 @@ static int transcode(AVFormatContext **output_files,
         codec = ost->st->codec;
         icodec = ist->st->codec;
 
-        if (metadata_streams_autocopy)
-            av_dict_copy(&ost->st->metadata, ist->st->metadata,
-                         AV_DICT_DONT_OVERWRITE);
-
         ost->st->disposition = ist->st->disposition;
         codec->bits_per_raw_sample= icodec->bits_per_raw_sample;
         codec->chroma_sample_location = icodec->chroma_sample_location;
@@ -2495,63 +2491,6 @@ static int transcode(AVFormatContext **output_files,
         ist->is_start = 1;
     }
 
-    /* set meta data information from input file if required */
-    for (i=0;i<nb_meta_data_maps;i++) {
-        AVFormatContext *files[2];
-        AVDictionary    **meta[2];
-        int j;
-
-#define METADATA_CHECK_INDEX(index, nb_elems, desc)\
-        if ((index) < 0 || (index) >= (nb_elems)) {\
-            snprintf(error, sizeof(error), "Invalid %s index %d while processing metadata maps\n",\
-                     (desc), (index));\
-            ret = AVERROR(EINVAL);\
-            goto dump_format;\
-        }
-
-        int out_file_index = meta_data_maps[i][0].file;
-        int in_file_index = meta_data_maps[i][1].file;
-        if (in_file_index < 0 || out_file_index < 0)
-            continue;
-        METADATA_CHECK_INDEX(out_file_index, nb_output_files, "output file")
-        METADATA_CHECK_INDEX(in_file_index, nb_input_files, "input file")
-
-        files[0] = output_files[out_file_index];
-        files[1] = input_files[in_file_index].ctx;
-
-        for (j = 0; j < 2; j++) {
-            MetadataMap *map = &meta_data_maps[i][j];
-
-            switch (map->type) {
-            case 'g':
-                meta[j] = &files[j]->metadata;
-                break;
-            case 's':
-                METADATA_CHECK_INDEX(map->index, files[j]->nb_streams, "stream")
-                meta[j] = &files[j]->streams[map->index]->metadata;
-                break;
-            case 'c':
-                METADATA_CHECK_INDEX(map->index, files[j]->nb_chapters, "chapter")
-                meta[j] = &files[j]->chapters[map->index]->metadata;
-                break;
-            case 'p':
-                METADATA_CHECK_INDEX(map->index, files[j]->nb_programs, "program")
-                meta[j] = &files[j]->programs[map->index]->metadata;
-                break;
-            }
-        }
-
-        av_dict_copy(meta[0], *meta[1], AV_DICT_DONT_OVERWRITE);
-    }
-
-    /* copy global metadata by default */
-    if (metadata_global_autocopy) {
-
-        for (i = 0; i < nb_output_files; i++)
-            av_dict_copy(&output_files[i]->metadata, input_files[0].ctx->metadata,
-                         AV_DICT_DONT_OVERWRITE);
-    }
-
     /* open files and write file headers */
     for(i=0;i<nb_output_files;i++) {
         os = output_files[i];
@@ -3136,10 +3075,9 @@ static int opt_map(const char *opt, const char *arg)
     return 0;
 }
 
-static void parse_meta_type(char *arg, char *type, int *index, char **endptr)
+static void parse_meta_type(char *arg, char *type, int *index)
 {
-    *endptr = arg;
-    if (*arg == ',') {
+    if (*arg == ':') {
         *type = *(++arg);
         switch (*arg) {
         case 'g':
@@ -3147,7 +3085,8 @@ static void parse_meta_type(char *arg, char *type, int *index, char **endptr)
         case 's':
         case 'c':
         case 'p':
-            *index = strtol(++arg, endptr, 0);
+            if (*(++arg) == ':')
+                *index = strtol(++arg, NULL, 0);
             break;
         default:
             fprintf(stderr, "Invalid metadata type %c.\n", *arg);
@@ -3165,15 +3104,15 @@ static int opt_map_metadata(const char *opt, const char *arg)
     meta_data_maps = grow_array(meta_data_maps, sizeof(*meta_data_maps),
                                 &nb_meta_data_maps, nb_meta_data_maps + 1);
 
-    m = &meta_data_maps[nb_meta_data_maps - 1][0];
+    m = &meta_data_maps[nb_meta_data_maps - 1][1];
     m->file = strtol(arg, &p, 0);
-    parse_meta_type(p, &m->type, &m->index, &p);
-    if (*p)
-        p++;
+    parse_meta_type(p, &m->type, &m->index);
 
-    m1 = &meta_data_maps[nb_meta_data_maps - 1][1];
-    m1->file = strtol(p, &p, 0);
-    parse_meta_type(p, &m1->type, &m1->index, &p);
+    m1 = &meta_data_maps[nb_meta_data_maps - 1][0];
+    if (p = strchr(opt, ':'))
+        parse_meta_type(p, &m1->type, &m1->index);
+    else
+        m1->type = 'g';
 
     if (m->type == 'g' || m1->type == 'g')
         metadata_global_autocopy = 0;
@@ -3977,6 +3916,62 @@ static int opt_output_file(const char *opt, const char *filename)
     if (chapters_input_file >= 0)
         copy_chapters(chapters_input_file, nb_output_files - 1);
 
+    /* copy metadata */
+    for (i = 0; i < nb_meta_data_maps; i++) {
+        AVFormatContext *files[2];
+        AVDictionary    **meta[2];
+        int j;
+
+#define METADATA_CHECK_INDEX(index, nb_elems, desc)\
+        if ((index) < 0 || (index) >= (nb_elems)) {\
+            av_log(NULL, AV_LOG_ERROR, "Invalid %s index %d while processing metadata maps\n",\
+                     (desc), (index));\
+            exit_program(1);\
+        }
+
+        int in_file_index = meta_data_maps[i][1].file;
+        if (in_file_index < 0)
+            continue;
+        METADATA_CHECK_INDEX(in_file_index, nb_input_files, "input file")
+
+        files[0] = oc;
+        files[1] = input_files[in_file_index].ctx;
+
+        for (j = 0; j < 2; j++) {
+            MetadataMap *map = &meta_data_maps[i][j];
+
+            switch (map->type) {
+            case 'g':
+                meta[j] = &files[j]->metadata;
+                break;
+            case 's':
+                METADATA_CHECK_INDEX(map->index, files[j]->nb_streams, "stream")
+                meta[j] = &files[j]->streams[map->index]->metadata;
+                break;
+            case 'c':
+                METADATA_CHECK_INDEX(map->index, files[j]->nb_chapters, "chapter")
+                meta[j] = &files[j]->chapters[map->index]->metadata;
+                break;
+            case 'p':
+                METADATA_CHECK_INDEX(map->index, files[j]->nb_programs, "program")
+                meta[j] = &files[j]->programs[map->index]->metadata;
+                break;
+            }
+        }
+
+        av_dict_copy(meta[0], *meta[1], AV_DICT_DONT_OVERWRITE);
+    }
+
+    /* copy global metadata by default */
+    if (metadata_global_autocopy)
+        av_dict_copy(&oc->metadata, input_files[0].ctx->metadata,
+                     AV_DICT_DONT_OVERWRITE);
+    if (metadata_streams_autocopy)
+        for (i = 0; i < oc->nb_streams; i++) {
+            InputStream *ist = &input_streams[output_streams_for_file[nb_output_files-1][i]->source_index];
+            av_dict_copy(&oc->streams[i]->metadata, ist->st->metadata, AV_DICT_DONT_OVERWRITE);
+        }
+
     frame_rate    = (AVRational){0, 0};
     frame_width   = 0;
     frame_height  = 0;
@@ -3985,6 +3980,12 @@ static int opt_output_file(const char *opt, const char *filename)
     audio_sample_fmt  = AV_SAMPLE_FMT_NONE;
     chapters_input_file = INT_MAX;
 
+    av_freep(&meta_data_maps);
+    nb_meta_data_maps = 0;
+    metadata_global_autocopy   = 1;
+    metadata_streams_autocopy  = 1;
+    metadata_chapters_autocopy = 1;
+
     av_freep(&forced_key_frames);
     uninit_opts();
     init_opts();