introduce side information for AVPacket

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>

1 files changed, 80 insertions, 11 deletions

diff --git a/libavcodec/avpacket.c b/libavcodec/avpacket.c
index f6aef20423..4b1002f62b 100644
--- a/libavcodec/avpacket.c
+++ b/libavcodec/avpacket.c
@@ -26,12 +26,21 @@
 void av_destruct_packet_nofree(AVPacket *pkt)
 {
     pkt->data = NULL; pkt->size = 0;
+    pkt->side_data       = NULL;
+    pkt->side_data_elems = 0;
 }
 
 void av_destruct_packet(AVPacket *pkt)
 {
+    int i;
+
     av_free(pkt->data);
     pkt->data = NULL; pkt->size = 0;
+
+    for (i = 0; i < pkt->side_data_elems; i++)
+        av_free(pkt->side_data[i].data);
+    av_freep(&pkt->side_data);
+    pkt->side_data_elems = 0;
 }
 
 void av_init_packet(AVPacket *pkt)
@@ -44,6 +53,8 @@ void av_init_packet(AVPacket *pkt)
     pkt->flags = 0;
     pkt->stream_index = 0;
     pkt->destruct= NULL;
+    pkt->side_data       = NULL;
+    pkt->side_data_elems = 0;
 }
 
 int av_new_packet(AVPacket *pkt, int size)
@@ -89,21 +100,38 @@ int av_grow_packet(AVPacket *pkt, int grow_by)
     return 0;
 }
 
+#define DUP_DATA(dst, size, padding) \
+    do { \
+        void *data; \
+        if (padding) { \
+            if ((unsigned)(size) > (unsigned)(size) + FF_INPUT_BUFFER_PADDING_SIZE) \
+                return AVERROR(ENOMEM); \
+            data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE); \
+        } else { \
+            data = av_malloc(size); \
+        } \
+        if (!data) \
+            return AVERROR(ENOMEM); \
+        memcpy(data, dst, size); \
+        if (padding) \
+            memset((uint8_t*)data + size, 0, FF_INPUT_BUFFER_PADDING_SIZE); \
+        dst = data; \
+    } while(0)
+
 int av_dup_packet(AVPacket *pkt)
 {
     if (((pkt->destruct == av_destruct_packet_nofree) || (pkt->destruct == NULL)) && pkt->data) {
-        uint8_t *data;
-        /* We duplicate the packet and don't forget to add the padding again. */
-        if((unsigned)pkt->size > (unsigned)pkt->size + FF_INPUT_BUFFER_PADDING_SIZE)
-            return AVERROR(ENOMEM);
-        data = av_malloc(pkt->size + FF_INPUT_BUFFER_PADDING_SIZE);
-        if (!data) {
-            return AVERROR(ENOMEM);
-        }
-        memcpy(data, pkt->data, pkt->size);
-        memset(data + pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
-        pkt->data = data;
+        DUP_DATA(pkt->data, pkt->size, 1);
         pkt->destruct = av_destruct_packet;
+
+        if (pkt->side_data_elems) {
+            int i;
+
+            DUP_DATA(pkt->side_data, pkt->side_data_elems * sizeof(*pkt->side_data), 0);
+            for (i = 0; i < pkt->side_data_elems; i++) {
+                DUP_DATA(pkt->side_data[i].data, pkt->side_data[i].size, 1);
+            }
+        }
     }
     return 0;
 }
@@ -113,5 +141,46 @@ void av_free_packet(AVPacket *pkt)
     if (pkt) {
         if (pkt->destruct) pkt->destruct(pkt);
         pkt->data = NULL; pkt->size = 0;
+        pkt->side_data       = NULL;
+        pkt->side_data_elems = 0;
+    }
+}
+
+uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
+                                 int size)
+{
+    int elems = pkt->side_data_elems;
+
+    if ((unsigned)elems + 1 > INT_MAX / sizeof(*pkt->side_data))
+        return NULL;
+    if ((unsigned)size > INT_MAX - FF_INPUT_BUFFER_PADDING_SIZE)
+        return NULL;
+
+    pkt->side_data = av_realloc(pkt->side_data, (elems + 1) * sizeof(*pkt->side_data));
+    if (!pkt->side_data)
+        return NULL;
+
+    pkt->side_data[elems].data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
+    if (!pkt->side_data[elems].data)
+        return NULL;
+    pkt->side_data[elems].size = size;
+    pkt->side_data[elems].type = type;
+    pkt->side_data_elems++;
+
+    return pkt->side_data[elems].data;
+}
+
+uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
+                                 int *size)
+{
+    int i;
+
+    for (i = 0; i < pkt->side_data_elems; i++) {
+        if (pkt->side_data[i].type == type) {
+            if (size)
+                *size = pkt->side_data[i].size;
+            return pkt->side_data[i].data;
+        }
     }
+    return NULL;
 }