w64dec: support metadata (summarylist guid)

Signed-off-by: Paul B Mahol <onemda@gmail.com>

libavformat/w64.c

@@ -31,3 +31,6 @@ const uint8_t ff_w64_guid_fmt [16] = { 'f', 'm', 't', ' ',
 
 const uint8_t ff_w64_guid_data[16] = { 'd', 'a', 't', 'a',
     0xF3, 0xAC, 0xD3, 0x11, 0x8C, 0xD1, 0x00, 0xC0, 0x4F, 0x8E, 0xDB, 0x8A };
+
+const uint8_t ff_w64_guid_summarylist[16] = { 0xBC, 0x94, 0x5F, 0x92,
+    0x5A, 0x52, 0xD2, 0x11, 0x86, 0xDC, 0x00, 0xC0, 0x4F, 0x8E, 0xDB, 0x8A };

libavformat/w64.h

@@ -25,5 +25,6 @@ extern const uint8_t ff_w64_guid_riff[16];
 extern const uint8_t ff_w64_guid_wave[16];
 extern const uint8_t ff_w64_guid_fmt [16];
 extern const uint8_t ff_w64_guid_data[16];
+extern const uint8_t ff_w64_guid_summarylist[16];
 
 #endif /* AVFORMAT_W64_H */

libavformat/wavdec.c

@@ -552,7 +552,7 @@ static int w64_probe(AVProbeData *p)
 
 static int w64_read_header(AVFormatContext *s)
 {
-    int64_t size;
+    int64_t size, data_ofs = 0;
     AVIOContext *pb  = s->pb;
     WAVDemuxContext    *wav = s->priv_data;
     AVStream *st;
@@ -572,34 +572,80 @@ static int w64_read_header(AVFormatContext *s)
         return -1;
     }
 
-    size = find_guid(pb, ff_w64_guid_fmt);
+    wav->w64 = 1;
-    if (size < 0) {
-        av_log(s, AV_LOG_ERROR, "could not find fmt guid\n");
-        return -1;
-    }
 
     st = avformat_new_stream(s, NULL);
     if (!st)
         return AVERROR(ENOMEM);
 
+    while (!url_feof(pb)) {
+        if (avio_read(pb, guid, 16) != 16)
+            break;
+        size = avio_rl64(pb);
+        if (size <= 24 || INT64_MAX - size < avio_tell(pb))
+            return AVERROR_INVALIDDATA;
+
+        if (!memcmp(guid, ff_w64_guid_fmt, 16)) {
             /* subtract chunk header size - normal wav file doesn't count it */
             ret = ff_get_wav_header(pb, st->codec, size - 24);
             if (ret < 0)
                 return ret;
             avio_skip(pb, FFALIGN(size, INT64_C(8)) - size);
 
+            avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
+        } else if (!memcmp(guid, ff_w64_guid_data, 16)) {
+            wav->data_end = avio_tell(pb) + size - 24;
+
+            data_ofs = avio_tell(pb);
+            if (!pb->seekable)
+                break;
+
+            avio_skip(pb, size - 24);
+        } else if (!memcmp(guid, ff_w64_guid_summarylist, 16)) {
+            int64_t start, end, cur;
+            uint32_t count, chunk_size, i;
+
+            start = avio_tell(pb);
+            end = start + size;
+            count = avio_rl32(pb);
+
+            for (i = 0; i < count; i++) {
+                char chunk_key[5], *value;
+
+                if (url_feof(pb) || (cur = avio_tell(pb)) < 0 || cur > end - 8 /* = tag + size */)
+                    break;
+
+                chunk_key[4] = 0;
+                avio_read(pb, chunk_key, 4);
+                chunk_size = avio_rl32(pb);
+
+                value = av_mallocz(chunk_size + 1);
+                if (!value)
+                    return AVERROR(ENOMEM);
+
+                ret = avio_get_str16le(pb, chunk_size, value, chunk_size);
+                avio_skip(pb, chunk_size - ret);
+
+                av_dict_set(&s->metadata, chunk_key, value, AV_DICT_DONT_STRDUP_VAL);
+            }
+
+            avio_skip(pb, end - avio_tell(pb));
+        } else {
+            av_log(s, AV_LOG_DEBUG, "unknown guid: "FF_PRI_GUID"\n", FF_ARG_GUID(guid));
+            avio_skip(pb, size - 24);
+        }
+    }
+
+    if (!data_ofs)
+        return AVERROR_EOF;
+
+    ff_metadata_conv_ctx(s, NULL, wav_metadata_conv);
+    ff_metadata_conv_ctx(s, NULL, ff_riff_info_conv);
+
     handle_stream_probing(st);
     st->need_parsing = AVSTREAM_PARSE_FULL_RAW;
 
-    avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
+    avio_seek(pb, data_ofs, SEEK_SET);
-
-    size = find_guid(pb, ff_w64_guid_data);
-    if (size < 0) {
-        av_log(s, AV_LOG_ERROR, "could not find data guid\n");
-        return -1;
-    }
-    wav->data_end = avio_tell(pb) + size - 24;
-    wav->w64      = 1;
 
     return 0;
 }