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rtmp: Allocate the prev_pkt arrays dynamically

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Normally, all channel ids are between 0 and 10, while they in
uncommon cases can have values up to 64k.

This avoids allocating two arrays for up to 64k entries (at a total
of over 6 MB in size) each when most of them aren't used at all.

Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Martin Storsjö
2013-10-11 22:16:04 +03:00
parent 39185ec4fa
commit 84a125c4c2
3 changed files with 92 additions and 28 deletions
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22
libavformat/rtmppkt.h
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@@ -114,10 +114,12 @@ void ff_rtmp_packet_destroy(RTMPPacket *pkt);
* @param chunk_size current chunk size
* @param prev_pkt previously read packet headers for all channels
* (may be needed for restoring incomplete packet header)
* @param nb_prev_pkt number of allocated elements in prev_pkt
* @return number of bytes read on success, negative value otherwise
*/
int ff_rtmp_packet_read(URLContext *h, RTMPPacket *p,
int chunk_size, RTMPPacket *prev_pkt);
int chunk_size, RTMPPacket **prev_pkt,
int *nb_prev_pkt);
/**
* Read internal RTMP packet sent by the server.
*
@@ -126,11 +128,13 @@ int ff_rtmp_packet_read(URLContext *h, RTMPPacket *p,
* @param chunk_size current chunk size
* @param prev_pkt previously read packet headers for all channels
* (may be needed for restoring incomplete packet header)
* @param nb_prev_pkt number of allocated elements in prev_pkt
* @param c the first byte already read
* @return number of bytes read on success, negative value otherwise
*/
int ff_rtmp_packet_read_internal(URLContext *h, RTMPPacket *p, int chunk_size,
RTMPPacket *prev_pkt, uint8_t c);
RTMPPacket **prev_pkt, int *nb_prev_pkt,
uint8_t c);
/**
* Send RTMP packet to the server.
@@ -140,10 +144,12 @@ int ff_rtmp_packet_read_internal(URLContext *h, RTMPPacket *p, int chunk_size,
* @param chunk_size current chunk size
* @param prev_pkt previously sent packet headers for all channels
* (may be used for packet header compressing)
* @param nb_prev_pkt number of allocated elements in prev_pkt
* @return number of bytes written on success, negative value otherwise
*/
int ff_rtmp_packet_write(URLContext *h, RTMPPacket *p,
int chunk_size, RTMPPacket *prev_pkt);
int chunk_size, RTMPPacket **prev_pkt,
int *nb_prev_pkt);
/**
* Print information and contents of RTMP packet.
@@ -153,6 +159,16 @@ int ff_rtmp_packet_write(URLContext *h, RTMPPacket *p,
*/
void ff_rtmp_packet_dump(void *ctx, RTMPPacket *p);
/**
* Enlarge the prev_pkt array to fit the given channel
*
* @param prev_pkt array with previously sent packet headers
* @param nb_prev_pkt number of allocated elements in prev_pkt
* @param channel the channel number that needs to be allocated
*/
int ff_rtmp_check_alloc_array(RTMPPacket **prev_pkt, int *nb_prev_pkt,
int channel);
/**
* @name Functions used to work with the AMF format (which is also used in .flv)
* @see amf_* funcs in libavformat/flvdec.c