diff --git a/libavcodec/packet.c b/libavcodec/packet.c index 9420c10be0..4736b1fef2 100644 --- a/libavcodec/packet.c +++ b/libavcodec/packet.c @@ -550,6 +550,7 @@ int avpriv_packet_list_put(PacketList *packet_buffer, int flags) { PacketListEntry *pktl = av_malloc(sizeof(*pktl)); + unsigned int update_end_point = 1; int ret; if (!pktl) @@ -573,13 +574,22 @@ int avpriv_packet_list_put(PacketList *packet_buffer, pktl->next = NULL; - if (packet_buffer->head) - packet_buffer->tail->next = pktl; - else + if (packet_buffer->head) { + if (flags & FF_PACKETLIST_FLAG_PREPEND) { + pktl->next = packet_buffer->head; + packet_buffer->head = pktl; + update_end_point = 0; + } else { + packet_buffer->tail->next = pktl; + } + } else packet_buffer->head = pktl; - /* Add the packet in the buffered packet list. */ - packet_buffer->tail = pktl; + if (update_end_point) { + /* Add the packet in the buffered packet list. */ + packet_buffer->tail = pktl; + } + return 0; } diff --git a/libavcodec/packet_internal.h b/libavcodec/packet_internal.h index 52fa6d9be9..9c0f4fead5 100644 --- a/libavcodec/packet_internal.h +++ b/libavcodec/packet_internal.h @@ -34,6 +34,8 @@ typedef struct PacketList { PacketListEntry *head, *tail; } PacketList; +#define FF_PACKETLIST_FLAG_PREPEND (1 << 0) /**< Prepend created AVPacketList instead of appending */ + /** * Append an AVPacket to the list. *