X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavformat%2Foggdec.c;h=7dd48af66ce73d90249ad304f0fdaf5cf65dd10b;hb=f93bd302821e08df5ee037e67c4b85bec5d4d475;hp=92dcafe2edcd7692c86444fed994b913115dd550;hpb=e983197cbc93420b67aa7e811be47d7278c2c8a2;p=ffmpeg

diff --git a/libavformat/oggdec.c b/libavformat/oggdec.c
index 92dcafe2edc..7dd48af66ce 100644
--- a/libavformat/oggdec.c
+++ b/libavformat/oggdec.c
@@ -178,6 +178,7 @@ static int ogg_reset(AVFormatContext *s)
         if (start_pos <= s->internal->data_offset) {
             os->lastpts = 0;
         }
+        os->start_trimming = 0;
         os->end_trimming = 0;
         av_freep(&os->new_metadata);
         os->new_metadata_size = 0;
@@ -206,7 +207,8 @@ static const struct ogg_codec *ogg_find_codec(uint8_t *buf, int size)
  * situation where a new audio stream spawn (identified with a new serial) and
  * must replace the previous one (track switch).
  */
-static int ogg_replace_stream(AVFormatContext *s, uint32_t serial, char *magic)
+static int ogg_replace_stream(AVFormatContext *s, uint32_t serial, char *magic,
+                              int probing)
 {
     struct ogg *ogg = s->priv_data;
     struct ogg_stream *os;
@@ -220,24 +222,25 @@ static int ogg_replace_stream(AVFormatContext *s, uint32_t serial, char *magic)
 
     /* Check for codecs */
     codec = ogg_find_codec(magic, 8);
-    if (!codec) {
+    if (!codec && !probing) {
         av_log(s, AV_LOG_ERROR, "Cannot identify new stream\n");
         return AVERROR_INVALIDDATA;
     }
 
-    /* If the codec matches, then we assume its a replacement */
-    for (i = 0; i < ogg->nstreams; i++) {
-        if (ogg->streams[i].codec == codec)
-            break;
-    }
-
-    /* Otherwise, create a new stream */
-    if (i >= ogg->nstreams)
-        return ogg_new_stream(s, serial);
-
-    os = &ogg->streams[i];
-    os->serial = serial;
-    os->codec  = codec;
+    /* We only have a single stream anyway, so if there's a new stream with
+     * a different codec just replace it */
+    os = &ogg->streams[0];
+    os->serial  = serial;
+    os->codec   = codec;
+    os->serial  = serial;
+    os->lastpts = 0;
+    os->lastdts = 0;
+    os->start_trimming = 0;
+    os->end_trimming = 0;
+
+    /* Chained files have extradata as a new packet */
+    if (codec == &ff_opus_codec)
+        os->header = -1;
 
     return i;
 }
@@ -294,7 +297,21 @@ static int data_packets_seen(const struct ogg *ogg)
     return 0;
 }
 
-static int ogg_read_page(AVFormatContext *s, int *sid)
+static int buf_realloc(struct ogg_stream *os, int size)
+{
+    /* Even if invalid guarantee there's enough memory to read the page */
+    if (os->bufsize - os->bufpos < size) {
+        uint8_t *nb = av_realloc(os->buf, 2*os->bufsize + AV_INPUT_BUFFER_PADDING_SIZE);
+        if (!nb)
+            return AVERROR(ENOMEM);
+        os->buf = nb;
+        os->bufsize *= 2;
+    }
+
+    return 0;
+}
+
+static int ogg_read_page(AVFormatContext *s, int *sid, int probing)
 {
     AVIOContext *bc = s->pb;
     struct ogg *ogg = s->priv_data;
@@ -375,14 +392,9 @@ static int ogg_read_page(AVFormatContext *s, int *sid)
     if (idx >= 0) {
         os = ogg->streams + idx;
 
-        /* Even if invalid guarantee there's enough memory to read the page */
-        if (os->bufsize - os->bufpos < size) {
-            uint8_t *nb = av_realloc(os->buf, 2*os->bufsize + AV_INPUT_BUFFER_PADDING_SIZE);
-            if (!nb)
-                return AVERROR(ENOMEM);
-            os->buf = nb;
-            os->bufsize *= 2;
-        }
+        ret = buf_realloc(os, size);
+        if (ret < 0)
+            return ret;
 
         readout_buf = os->buf + os->bufpos;
     } else {
@@ -417,7 +429,7 @@ static int ogg_read_page(AVFormatContext *s, int *sid)
     /* CRC is correct so we can be 99% sure there's an actual change here */
     if (idx < 0) {
         if (data_packets_seen(ogg))
-            idx = ogg_replace_stream(s, serial, readout_buf);
+            idx = ogg_replace_stream(s, serial, readout_buf, probing);
         else
             idx = ogg_new_stream(s, serial);
 
@@ -429,6 +441,12 @@ static int ogg_read_page(AVFormatContext *s, int *sid)
 
         os = ogg->streams + idx;
 
+        ret = buf_realloc(os, size);
+        if (ret < 0) {
+            av_free(readout_buf);
+            return ret;
+        }
+
         memcpy(os->buf + os->bufpos, readout_buf, size);
         av_free(readout_buf);
     }
@@ -492,7 +510,7 @@ static int ogg_packet(AVFormatContext *s, int *sid, int *dstart, int *dsize,
         idx = ogg->curidx;
 
         while (idx < 0) {
-            ret = ogg_read_page(s, &idx);
+            ret = ogg_read_page(s, &idx, 0);
             if (ret < 0)
                 return ret;
         }
@@ -643,7 +661,7 @@ static int ogg_get_length(AVFormatContext *s)
     avio_seek(s->pb, end, SEEK_SET);
     ogg->page_pos = -1;
 
-    while (!ogg_read_page(s, &i)) {
+    while (!ogg_read_page(s, &i, 1)) {
         if (ogg->streams[i].granule != -1 && ogg->streams[i].granule != 0 &&
             ogg->streams[i].codec) {
             s->streams[i]->duration =
@@ -847,13 +865,15 @@ retry:
     pkt->duration = os->pduration;
     pkt->pos      = fpos;
 
-    if (os->end_trimming) {
+    if (os->start_trimming || os->end_trimming) {
         uint8_t *side_data = av_packet_new_side_data(pkt,
                                                      AV_PKT_DATA_SKIP_SAMPLES,
                                                      10);
         if(!side_data)
             return AVERROR(ENOMEM);
+         AV_WL32(side_data + 0, os->start_trimming);
         AV_WL32(side_data + 4, os->end_trimming);
+        os->start_trimming = 0;
         os->end_trimming = 0;
     }