From 94eadee7efc2c5d19ecfe92d36f0556663468080 Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michaelni@gmx.at>
Date: Wed, 20 Apr 2011 03:25:48 +0200
Subject: Merge/split side data.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
---
 libavcodec/avcodec.h  |  5 ++++
 libavcodec/avpacket.c | 81 ++++++++++++++++++++++++++++++++++++++++++++++++++-
 libavcodec/utils.c    |  4 +--
 3 files changed, 87 insertions(+), 3 deletions(-)

(limited to 'libavcodec')

diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index 99c349ed15..a25612d2f9 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -3229,6 +3229,11 @@ uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
 uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
                                  int *size);
 
+int av_packet_merge_side_data(AVPacket *pkt);
+
+int av_packet_split_side_data(AVPacket *pkt);
+
+
 /* resample.c */
 
 struct ReSampleContext;
diff --git a/libavcodec/avpacket.c b/libavcodec/avpacket.c
index ada73a598c..ff34285b48 100644
--- a/libavcodec/avpacket.c
+++ b/libavcodec/avpacket.c
@@ -21,7 +21,7 @@
 
 #include "avcodec.h"
 #include "libavutil/avassert.h"
-
+#include "bytestream.h"
 
 void av_destruct_packet_nofree(AVPacket *pkt)
 {
@@ -196,3 +196,82 @@ uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
     }
     return NULL;
 }
+
+#define FF_MERGE_MARKER 0x8c4d9d108e25e9feULL
+
+int av_packet_merge_side_data(AVPacket *pkt){
+    if(pkt->side_data_elems){
+        int i;
+        uint8_t *p;
+        uint64_t size= pkt->size + 8LL + FF_INPUT_BUFFER_PADDING_SIZE;
+        AVPacket old= *pkt;
+        for (i=0; i<old.side_data_elems; i++) {
+            size += old.side_data[i].size + 5LL;
+        }
+        if (size > INT_MAX)
+            return AVERROR(EINVAL);
+        p = av_malloc(size);
+        if (!p)
+            return AVERROR(ENOMEM);
+        pkt->data = p;
+        pkt->destruct = av_destruct_packet;
+        pkt->size = size - FF_INPUT_BUFFER_PADDING_SIZE;
+        bytestream_put_buffer(&p, old.data, old.size);
+        for (i=old.side_data_elems-1; i>=0; i--) {
+            bytestream_put_buffer(&p, old.side_data[i].data, old.side_data[i].size);
+            bytestream_put_be32(&p, old.side_data[i].size);
+            *p++ = old.side_data[i].type | ((i==old.side_data_elems-1)*128);
+        }
+        bytestream_put_be64(&p, FF_MERGE_MARKER);
+        av_assert0(p-pkt->data == pkt->size);
+        memset(p, 0, FF_INPUT_BUFFER_PADDING_SIZE);
+        av_free_packet(&old);
+        pkt->side_data_elems = 0;
+        pkt->side_data = NULL;
+        return 1;
+    }
+    return 0;
+}
+
+int av_packet_split_side_data(AVPacket *pkt){
+    if (!pkt->side_data_elems && pkt->size >12 && AV_RB64(pkt->data + pkt->size - 8) == FF_MERGE_MARKER){
+        int i;
+        unsigned int size;
+        uint8_t *p= pkt->data + pkt->size - 8 - 5;
+
+        av_dup_packet(pkt);
+
+        for (i=1; ; i++){
+            size = AV_RB32(p);
+            if (size>INT_MAX || p - pkt->data <= size)
+                return 0;
+            if (p[4]&128)
+                break;
+            p-= size+5;
+        }
+
+        pkt->side_data = av_malloc(i * sizeof(*pkt->side_data));
+        if (!pkt->side_data)
+            return AVERROR(ENOMEM);
+
+        p= pkt->data + pkt->size - 8 - 5;
+        for (i=0; ; i++){
+            size= AV_RB32(p);
+            av_assert0(size<=INT_MAX && p - pkt->data > size);
+            pkt->side_data[i].data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
+            pkt->side_data[i].size = size;
+            pkt->side_data[i].type = p[4]&127;
+            if (!pkt->side_data[i].data)
+                return AVERROR(ENOMEM);
+            memcpy(pkt->side_data[i].data, p-size, size);
+            pkt->size -= size + 5;
+            if(p[4]&128)
+                break;
+            p-= size+5;
+        }
+        pkt->size -= 8;
+        pkt->side_data_elems = i+1;
+        return 1;
+    }
+    return 0;
+}
diff --git a/libavcodec/utils.c b/libavcodec/utils.c
index b61f9b70ea..aecfb8af33 100644
--- a/libavcodec/utils.c
+++ b/libavcodec/utils.c
@@ -733,9 +733,9 @@ int attribute_align_arg avcodec_decode_video2(AVCodecContext *avctx, AVFrame *pi
     if((avctx->coded_width||avctx->coded_height) && av_image_check_size(avctx->coded_width, avctx->coded_height, 0, avctx))
         return -1;
 
-    avctx->pkt = avpkt;
-
     if((avctx->codec->capabilities & CODEC_CAP_DELAY) || avpkt->size || (avctx->active_thread_type&FF_THREAD_FRAME)){
+        av_packet_split_side_data(avpkt);
+        avctx->pkt = avpkt;
         if (HAVE_PTHREADS && avctx->active_thread_type&FF_THREAD_FRAME)
              ret = ff_thread_decode_frame(avctx, picture, got_picture_ptr,
                                           avpkt);
-- 
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