From 14d50c19dc56dc5be5dfcd699b29f6275735fc1e Mon Sep 17 00:00:00 2001
From: Paul B Mahol <onemda@gmail.com>
Date: Sat, 29 Dec 2012 15:00:50 +0000
Subject: w64dec: support metadata (summarylist guid)

Signed-off-by: Paul B Mahol <onemda@gmail.com>
---
 libavformat/wavdec.c | 86 ++++++++++++++++++++++++++++++++++++++++------------
 1 file changed, 66 insertions(+), 20 deletions(-)

(limited to 'libavformat/wavdec.c')

diff --git a/libavformat/wavdec.c b/libavformat/wavdec.c
index de140713ea..f8a36e9d6c 100644
--- a/libavformat/wavdec.c
+++ b/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);
-    if (size < 0) {
-        av_log(s, AV_LOG_ERROR, "could not find fmt guid\n");
-        return -1;
-    }
+    wav->w64 = 1;
 
     st = avformat_new_stream(s, NULL);
     if (!st)
         return AVERROR(ENOMEM);
 
-    /* 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);
+    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;
 
-    handle_stream_probing(st);
-    st->need_parsing = AVSTREAM_PARSE_FULL_RAW;
+        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);
+            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;
 
-    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;
+            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);
+        }
     }
-    wav->data_end = avio_tell(pb) + size - 24;
-    wav->w64      = 1;
+
+    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;
+
+    avio_seek(pb, data_ofs, SEEK_SET);
 
     return 0;
 }
-- 
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