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zero copy packet handling for DV1394 by Max Krasnyansky

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Originally committed as revision 1542 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Fabrice Bellard
2003-02-03 22:58:29 +00:00
parent cdc90af008
commit 6fa5a56c1b
3 changed files with 79 additions and 59 deletions
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39
libavformat/utils.c
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@@ -150,6 +150,15 @@ AVInputFormat *av_find_input_format(const char *short_name)
/* memory handling */
/**
* Default packet destructor
*/
static void av_destruct_packet(AVPacket *pkt)
{
av_free(pkt->data);
pkt->data = NULL; pkt->size = 0;
}
/**
* Allocate the payload of a packet and intialized its fields to default values.
*
@@ -159,34 +168,18 @@ AVInputFormat *av_find_input_format(const char *short_name)
*/
int av_new_packet(AVPacket *pkt, int size)
{
int i;
pkt->data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
if (!pkt->data)
void *data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
if (!data)
return AVERROR_NOMEM;
memset(data + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
av_init_packet(pkt);
pkt->data = data;
pkt->size = size;
/* sane state */
pkt->pts = AV_NOPTS_VALUE;
pkt->stream_index = 0;
pkt->flags = 0;
for(i=0; i<FF_INPUT_BUFFER_PADDING_SIZE; i++)
pkt->data[size+i]= 0;
pkt->destruct = av_destruct_packet;
return 0;
}
/**
* Free a packet
*
* @param pkt packet to free
*/
void av_free_packet(AVPacket *pkt)
{
av_freep(&pkt->data);
/* fail safe */
pkt->size = 0;
}
/* fifo handling */
int fifo_init(FifoBuffer *f, int size)