avformat/voc: add seeking support

Fixes Ticket1333

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

1 files changed, 43 insertions, 1 deletions

diff --git a/libavformat/vocdec.c b/libavformat/vocdec.c
index 0b6b5a59ae..c49ed163cb 100644
--- a/libavformat/vocdec.c
+++ b/libavformat/vocdec.c
@@ -71,6 +71,15 @@ ff_voc_get_packet(AVFormatContext *s, AVPacket *pkt, AVStream *st, int max_size)
     int size, tmp_codec=-1;
     int sample_rate = 0;
     int channels = 1;
+    int64_t duration;
+    int ret;
+
+    av_add_index_entry(st,
+                       avio_tell(pb),
+                       voc->pts,
+                       voc->remaining_size,
+                       0,
+                       AVINDEX_KEYFRAME);
 
     while (!voc->remaining_size) {
         type = avio_r8(pb);
@@ -156,7 +165,17 @@ ff_voc_get_packet(AVFormatContext *s, AVPacket *pkt, AVStream *st, int max_size)
         max_size = 2048;
     size = FFMIN(voc->remaining_size, max_size);
     voc->remaining_size -= size;
-    return av_get_packet(pb, pkt, size);
+
+    ret = av_get_packet(pb, pkt, size);
+    pkt->dts = pkt->pts = voc->pts;
+
+    duration = av_get_audio_frame_duration(st->codec, size);
+    if (duration > 0 && voc->pts != AV_NOPTS_VALUE)
+        voc->pts += duration;
+    else
+        voc->pts = AV_NOPTS_VALUE;
+
+    return ret;
 }
 
 static int voc_read_packet(AVFormatContext *s, AVPacket *pkt)
@@ -164,6 +183,28 @@ static int voc_read_packet(AVFormatContext *s, AVPacket *pkt)
     return ff_voc_get_packet(s, pkt, s->streams[0], 0);
 }
 
+static int voc_read_seek(AVFormatContext *s, int stream_index,
+                         int64_t timestamp, int flags)
+{
+    VocDecContext *voc = s->priv_data;
+    AVStream *st = s->streams[stream_index];
+    int index = av_index_search_timestamp(st, timestamp, flags);
+
+    if (index >= 0 && index < st->nb_index_entries - 1) {
+        AVIndexEntry *e = &st->index_entries[index];
+        avio_seek(s->pb, e->pos, SEEK_SET);
+        voc->pts = e->timestamp;
+        voc->remaining_size = e->size;
+        return 0;
+    } else if (st->nb_index_entries && st->index_entries[0].timestamp <= timestamp) {
+        AVIndexEntry *e = &st->index_entries[st->nb_index_entries - 1];
+        // prepare context for seek_frame_generic()
+        voc->pts = e->timestamp;
+        voc->remaining_size = e->size;
+    }
+    return -1;
+}
+
 AVInputFormat ff_voc_demuxer = {
     .name           = "voc",
     .long_name      = NULL_IF_CONFIG_SMALL("Creative Voice"),
@@ -171,5 +212,6 @@ AVInputFormat ff_voc_demuxer = {
     .read_probe     = voc_probe,
     .read_header    = voc_read_header,
     .read_packet    = voc_read_packet,
+    .read_seek      = voc_read_seek,
     .codec_tag      = (const AVCodecTag* const []){ ff_voc_codec_tags, 0 },
 };