avformat/voc: add seeking support

Fixes Ticket1333

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

Changelog

@@ -12,6 +12,7 @@ version <next>:
 - cropdetect support for non 8bpp, absolute (if limit >= 1) and relative (if limit < 1.0) threshold
 - Camellia symmetric block cipher
 - OpenH264 encoder wrapper
+- VOC seeking support
 
 
 version 2.5:

libavformat/version.h

@@ -31,7 +31,7 @@
 
 #define LIBAVFORMAT_VERSION_MAJOR 56
 #define LIBAVFORMAT_VERSION_MINOR  18
-#define LIBAVFORMAT_VERSION_MICRO 100
+#define LIBAVFORMAT_VERSION_MICRO 101
 
 #define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
                                                LIBAVFORMAT_VERSION_MINOR, \

libavformat/voc.h

@@ -27,6 +27,7 @@
 
 typedef struct voc_dec_context {
     int64_t remaining_size;
+    int64_t pts;
 } VocDecContext;
 
 typedef enum voc_type {

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 },
 };

tests/ref/seek/lavf-voc

@@ -1,27 +1,44 @@
 ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:     32 size:  1024
-ret:-1         st:-1 flags:0  ts:-1.000000
+ret: 0         st:-1 flags:0  ts:-1.000000
-ret:-1         st:-1 flags:1  ts: 1.894167
+ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:     32 size:  1024
-ret:-1         st: 0 flags:0  ts: 0.788330
+ret: 0         st:-1 flags:1  ts: 1.894167
+ret:-EOF
+ret: 0         st: 0 flags:0  ts: 0.788330
+ret: 0         st: 0 flags:1 dts: 0.800773 pts: 0.800773 pos:  33956 size:  1024
 ret:-1         st: 0 flags:1  ts:-0.317494
 ret:-1         st:-1 flags:0  ts: 2.576668
-ret:-1         st:-1 flags:1  ts: 1.470835
+ret: 0         st:-1 flags:1  ts: 1.470835
-ret:-1         st: 0 flags:0  ts: 0.365012
+ret:-EOF
+ret: 0         st: 0 flags:0  ts: 0.365012
+ret: 0         st: 0 flags:1 dts: 0.376834 pts: 0.376834 pos:  15452 size:  1024
 ret:-1         st: 0 flags:1  ts:-0.740834
 ret:-1         st:-1 flags:0  ts: 2.153336
-ret:-1         st:-1 flags:1  ts: 1.047503
+ret: 0         st:-1 flags:1  ts: 1.047503
-ret:-1         st: 0 flags:0  ts:-0.058328
+ret:-EOF
-ret:-1         st: 0 flags:1  ts: 2.835848
+ret: 0         st: 0 flags:0  ts:-0.058328
+ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:     32 size:  1024
+ret: 0         st: 0 flags:1  ts: 2.835848
+ret:-EOF
 ret:-1         st:-1 flags:0  ts: 1.730004
-ret:-1         st:-1 flags:1  ts: 0.624171
+ret: 0         st:-1 flags:1  ts: 0.624171
-ret:-1         st: 0 flags:0  ts:-0.481669
+ret: 0         st: 0 flags:1 dts: 0.612356 pts: 0.612356 pos:  25732 size:  1024
-ret:-1         st: 0 flags:1  ts: 2.412507
+ret: 0         st: 0 flags:0  ts:-0.481669
+ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:     32 size:  1024
+ret: 0         st: 0 flags:1  ts: 2.412507
+ret:-EOF
 ret:-1         st:-1 flags:0  ts: 1.306672
-ret:-1         st:-1 flags:1  ts: 0.200839
+ret: 0         st:-1 flags:1  ts: 0.200839
-ret:-1         st: 0 flags:0  ts:-0.904986
+ret: 0         st: 0 flags:1 dts: 0.188417 pts: 0.188417 pos:   7228 size:  1024
-ret:-1         st: 0 flags:1  ts: 1.989167
+ret: 0         st: 0 flags:0  ts:-0.904986
-ret:-1         st:-1 flags:0  ts: 0.883340
+ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:     32 size:  1024
+ret: 0         st: 0 flags:1  ts: 1.989167
+ret:-EOF
+ret: 0         st:-1 flags:0  ts: 0.883340
+ret: 0         st: 0 flags:1 dts: 0.894981 pts: 0.894981 pos:  38068 size:  1024
 ret:-1         st:-1 flags:1  ts:-0.222493
 ret:-1         st: 0 flags:0  ts: 2.671673
-ret:-1         st: 0 flags:1  ts: 1.565849
+ret: 0         st: 0 flags:1  ts: 1.565849
-ret:-1         st:-1 flags:0  ts: 0.460008
+ret:-EOF
+ret: 0         st:-1 flags:0  ts: 0.460008
+ret: 0         st: 0 flags:1 dts: 0.471043 pts: 0.471043 pos:  19564 size:  1024
 ret:-1         st:-1 flags:1  ts:-0.645825