diff --git a/include/opus.h b/include/opus.h
index b9e899613ea2f1175a19fdf4d0f37c08d83ffb6e..93a53a2ffcd0ae66623cca699f37a535ab50409f 100644
--- a/include/opus.h
+++ b/include/opus.h
@@ -911,7 +911,63 @@ OPUS_EXPORT OPUS_WARN_UNUSED_RESULT int opus_repacketizer_get_nb_frames(OpusRepa
*/
OPUS_EXPORT OPUS_WARN_UNUSED_RESULT opus_int32 opus_repacketizer_out(OpusRepacketizer *rp, unsigned char *data, opus_int32 maxlen) OPUS_ARG_NONNULL(1);
-OPUS_EXPORT OPUS_WARN_UNUSED_RESULT int opus_packet_pad(unsigned char *data, opus_int32 len, opus_int32 new_len);
+/** Pads a given Opus packet to a larger size (possibly changing the TOC sequence).
+ * @param[in,out] data <tt>const unsigned char*</tt>: The buffer containing the
+ * packet to pad.
+ * @param len <tt>opus_int32</tt>: The size of the packet.
+ * This must be at least 1.
+ * @param new_len <tt>opus_int32</tt>: The desired size of the packet after padding.
+ * This must be at least as large as len.
+ * @returns an error code
+ * @retval #OPUS_OK \a on success.
+ * @retval #OPUS_BAD_ARG \a len was less than 1 or new_len was less than len.
+ * @retval #OPUS_INVALID_PACKET \a data did not contain a valid Opus packet.
+ */
+OPUS_EXPORT int opus_packet_pad(unsigned char *data, opus_int32 len, opus_int32 new_len);
+
+/** Remove all padding from a given Opus packet and rewrite the TOC sequence to
+ * minimize space usage.
+ * @param[in,out] data <tt>const unsigned char*</tt>: The buffer containing the
+ * packet to strip.
+ * @param len <tt>opus_int32</tt>: The size of the packet.
+ * This must be at least 1.
+ * @returns The new size of the output packet on success, or an error code
+ * on failure.
+ * @retval #OPUS_BAD_ARG \a len was less than 1.
+ * @retval #OPUS_INVALID_PACKET \a data did not contain a valid Opus packet.
+ */
+OPUS_EXPORT OPUS_WARN_UNUSED_RESULT opus_int32 opus_packet_unpad(unsigned char *data, opus_int32 len);
+
+/** Pads a given Opus multi-stream packet to a larger size (possibly changing the TOC sequence).
+ * @param[in,out] data <tt>const unsigned char*</tt>: The buffer containing the
+ * packet to pad.
+ * @param len <tt>opus_int32</tt>: The size of the packet.
+ * This must be at least 1.
+ * @param new_len <tt>opus_int32</tt>: The desired size of the packet after padding.
+ * This must be at least 1.
+ * @param nb_streams <tt>opus_int32</tt>: The number of streams (not channels) in the packet.
+ * This must be at least as large as len.
+ * @returns an error code
+ * @retval #OPUS_OK \a on success.
+ * @retval #OPUS_BAD_ARG \a len was less than 1.
+ * @retval #OPUS_INVALID_PACKET \a data did not contain a valid Opus packet.
+ */
+OPUS_EXPORT int opus_multistream_packet_pad(unsigned char *data, opus_int32 len, opus_int32 new_len, int nb_streams);
+
+/** Remove all padding from a given Opus multi-stream packet and rewrite the TOC sequence to
+ * minimize space usage.
+ * @param[in,out] data <tt>const unsigned char*</tt>: The buffer containing the
+ * packet to strip.
+ * @param len <tt>opus_int32</tt>: The size of the packet.
+ * This must be at least 1.
+ * @param nb_streams <tt>opus_int32</tt>: The number of streams (not channels) in the packet.
+ * This must be at least 1.
+ * @returns The new size of the output packet on success, or an error code
+ * on failure.
+ * @retval #OPUS_BAD_ARG \a len was less than 1 or new_len was less than len.
+ * @retval #OPUS_INVALID_PACKET \a data did not contain a valid Opus packet.
+ */
+OPUS_EXPORT OPUS_WARN_UNUSED_RESULT opus_int32 opus_multistream_packet_unpad(unsigned char *data, opus_int32 len, int nb_streams);
/**@}*/
diff --git a/src/repacketizer.c b/src/repacketizer.c
index 45bb38480dc1acbccf8c03bcf927d7627098fc73..5bf0b5aba7bbf215b4a66130654dfbb14e7a9323 100644
--- a/src/repacketizer.c
+++ b/src/repacketizer.c
@@ -207,7 +207,7 @@ opus_int32 opus_repacketizer_out_range_impl(OpusRepacketizer *rp, int begin, int
for (i=0;i<count;i++)
{
/* Using OPUS_MOVE() instead of OPUS_COPY() in case we're doing in-place
- padding from opus_packet_pad */
+ padding from opus_packet_pad or opus_packet_strip(). */
OPUS_MOVE(ptr, frames[i], len[i]);
ptr += len[i];
}
@@ -233,6 +233,8 @@ int opus_packet_pad(unsigned char *data, opus_int32 len, opus_int32 new_len)
{
OpusRepacketizer rp;
opus_int32 ret;
+ if (len < 1)
+ return OPUS_BAD_ARG;
if (len==new_len)
return OPUS_OK;
else if (len > new_len)
@@ -247,3 +249,91 @@ int opus_packet_pad(unsigned char *data, opus_int32 len, opus_int32 new_len)
else
return ret;
}
+
+opus_int32 opus_packet_unpad(unsigned char *data, opus_int32 len)
+{
+ OpusRepacketizer rp;
+ opus_int32 ret;
+ if (len < 1)
+ return OPUS_BAD_ARG;
+ opus_repacketizer_init(&rp);
+ ret = opus_repacketizer_cat(&rp, data, len);
+ if (ret < 0)
+ return ret;
+ ret = opus_repacketizer_out_range_impl(&rp, 0, rp.nb_frames, data, len, 0, 0);
+ celt_assert(ret > 0);
+ return ret;
+}
+
+int opus_multistream_packet_pad(unsigned char *data, opus_int32 len, opus_int32 new_len, int nb_streams)
+{
+ int s;
+ int count;
+ unsigned char toc;
+ opus_int16 size[48];
+ opus_int32 packet_offset;
+ opus_int32 amount;
+
+ if (len < 1)
+ return OPUS_BAD_ARG;
+ if (len==new_len)
+ return OPUS_OK;
+ else if (len > new_len)
+ return OPUS_BAD_ARG;
+ amount = new_len - len;
+ /* Seek to last stream */
+ for (s=0;s<nb_streams-1;s++)
+ {
+ if (len<=0)
+ return OPUS_INVALID_PACKET;
+ count = opus_packet_parse_impl(data, len, 0, &toc, NULL,
+ size, NULL, &packet_offset);
+ if (count<0)
+ return count;
+ data += packet_offset;
+ len -= packet_offset;
+ }
+ return opus_packet_pad(data, len, len+amount);
+}
+
+opus_int32 opus_multistream_packet_unpad(unsigned char *data, opus_int32 len, int nb_streams)
+{
+ int s;
+ unsigned char toc;
+ opus_int16 size[48];
+ opus_int32 packet_offset;
+ OpusRepacketizer rp;
+ unsigned char *dst;
+ opus_int32 dst_len;
+
+ if (len < 1)
+ return OPUS_BAD_ARG;
+ dst = data;
+ dst_len = 0;
+ /* Seek to last stream */
+ for (s=0;s<nb_streams;s++)
+ {
+ opus_int32 ret;
+ int self_delimited = s!=nb_streams-1;
+ if (len<=0)
+ return OPUS_INVALID_PACKET;
+ opus_repacketizer_init(&rp);
+ ret = opus_packet_parse_impl(data, len, self_delimited, &toc, NULL,
+ size, NULL, &packet_offset);
+ if (ret<0)
+ return ret;
+ ret = opus_repacketizer_cat(&rp, data, packet_offset);
+ if (ret < 0)
+ return ret;
+ ret = opus_repacketizer_out_range_impl(&rp, 0, rp.nb_frames, dst, len, self_delimited, 0);
+ if (ret < 0)
+ return ret;
+ else
+ dst_len += ret;
+ dst += ret;
+ data += packet_offset;
+ len -= packet_offset;
+ }
+ return dst_len;
+}
+